2 * Copyright © 2010 Intel Corporation
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
21 * DEALINGS IN THE SOFTWARE.
26 * Convert abstract syntax to to high-level intermediate reprensentation (HIR).
28 * During the conversion to HIR, the majority of the symantic checking is
29 * preformed on the program. This includes:
31 * * Symbol table management
35 * The majority of this work could be done during parsing, and the parser could
36 * probably generate HIR directly. However, this results in frequent changes
37 * to the parser code. Since we do not assume that every system this complier
38 * is built on will have Flex and Bison installed, we have to store the code
39 * generated by these tools in our version control system. In other parts of
40 * the system we've seen problems where a parser was changed but the generated
41 * code was not committed, merge conflicts where created because two developers
42 * had slightly different versions of Bison installed, etc.
44 * I have also noticed that running Bison generated parsers in GDB is very
45 * irritating. When you get a segfault on '$$ = $1->foo', you can't very
46 * well 'print $1' in GDB.
48 * As a result, my preference is to put as little C code as possible in the
49 * parser (and lexer) sources.
52 #include "main/core.h" /* for struct gl_extensions */
53 #include "glsl_symbol_table.h"
54 #include "glsl_parser_extras.h"
56 #include "glsl_types.h"
57 #include "program/hash_table.h"
61 detect_conflicting_assignments(struct _mesa_glsl_parse_state
*state
,
62 exec_list
*instructions
);
65 _mesa_ast_to_hir(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
)
67 _mesa_glsl_initialize_variables(instructions
, state
);
69 state
->symbols
->separate_function_namespace
= state
->language_version
== 110;
71 state
->current_function
= NULL
;
73 state
->toplevel_ir
= instructions
;
75 /* Section 4.2 of the GLSL 1.20 specification states:
76 * "The built-in functions are scoped in a scope outside the global scope
77 * users declare global variables in. That is, a shader's global scope,
78 * available for user-defined functions and global variables, is nested
79 * inside the scope containing the built-in functions."
81 * Since built-in functions like ftransform() access built-in variables,
82 * it follows that those must be in the outer scope as well.
84 * We push scope here to create this nesting effect...but don't pop.
85 * This way, a shader's globals are still in the symbol table for use
88 state
->symbols
->push_scope();
90 foreach_list_typed (ast_node
, ast
, link
, & state
->translation_unit
)
91 ast
->hir(instructions
, state
);
93 detect_recursion_unlinked(state
, instructions
);
94 detect_conflicting_assignments(state
, instructions
);
96 state
->toplevel_ir
= NULL
;
101 * If a conversion is available, convert one operand to a different type
103 * The \c from \c ir_rvalue is converted "in place".
105 * \param to Type that the operand it to be converted to
106 * \param from Operand that is being converted
107 * \param state GLSL compiler state
110 * If a conversion is possible (or unnecessary), \c true is returned.
111 * Otherwise \c false is returned.
114 apply_implicit_conversion(const glsl_type
*to
, ir_rvalue
* &from
,
115 struct _mesa_glsl_parse_state
*state
)
118 if (to
->base_type
== from
->type
->base_type
)
121 /* This conversion was added in GLSL 1.20. If the compilation mode is
122 * GLSL 1.10, the conversion is skipped.
124 if (!state
->is_version(120, 0))
127 /* From page 27 (page 33 of the PDF) of the GLSL 1.50 spec:
129 * "There are no implicit array or structure conversions. For
130 * example, an array of int cannot be implicitly converted to an
131 * array of float. There are no implicit conversions between
132 * signed and unsigned integers."
134 /* FINISHME: The above comment is partially a lie. There is int/uint
135 * FINISHME: conversion for immediate constants.
137 if (!to
->is_float() || !from
->type
->is_numeric())
140 /* Convert to a floating point type with the same number of components
141 * as the original type - i.e. int to float, not int to vec4.
143 to
= glsl_type::get_instance(GLSL_TYPE_FLOAT
, from
->type
->vector_elements
,
144 from
->type
->matrix_columns
);
146 switch (from
->type
->base_type
) {
148 from
= new(ctx
) ir_expression(ir_unop_i2f
, to
, from
, NULL
);
151 from
= new(ctx
) ir_expression(ir_unop_u2f
, to
, from
, NULL
);
154 from
= new(ctx
) ir_expression(ir_unop_b2f
, to
, from
, NULL
);
164 static const struct glsl_type
*
165 arithmetic_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
167 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
169 const glsl_type
*type_a
= value_a
->type
;
170 const glsl_type
*type_b
= value_b
->type
;
172 /* From GLSL 1.50 spec, page 56:
174 * "The arithmetic binary operators add (+), subtract (-),
175 * multiply (*), and divide (/) operate on integer and
176 * floating-point scalars, vectors, and matrices."
178 if (!type_a
->is_numeric() || !type_b
->is_numeric()) {
179 _mesa_glsl_error(loc
, state
,
180 "Operands to arithmetic operators must be numeric");
181 return glsl_type::error_type
;
185 /* "If one operand is floating-point based and the other is
186 * not, then the conversions from Section 4.1.10 "Implicit
187 * Conversions" are applied to the non-floating-point-based operand."
189 if (!apply_implicit_conversion(type_a
, value_b
, state
)
190 && !apply_implicit_conversion(type_b
, value_a
, state
)) {
191 _mesa_glsl_error(loc
, state
,
192 "Could not implicitly convert operands to "
193 "arithmetic operator");
194 return glsl_type::error_type
;
196 type_a
= value_a
->type
;
197 type_b
= value_b
->type
;
199 /* "If the operands are integer types, they must both be signed or
202 * From this rule and the preceeding conversion it can be inferred that
203 * both types must be GLSL_TYPE_FLOAT, or GLSL_TYPE_UINT, or GLSL_TYPE_INT.
204 * The is_numeric check above already filtered out the case where either
205 * type is not one of these, so now the base types need only be tested for
208 if (type_a
->base_type
!= type_b
->base_type
) {
209 _mesa_glsl_error(loc
, state
,
210 "base type mismatch for arithmetic operator");
211 return glsl_type::error_type
;
214 /* "All arithmetic binary operators result in the same fundamental type
215 * (signed integer, unsigned integer, or floating-point) as the
216 * operands they operate on, after operand type conversion. After
217 * conversion, the following cases are valid
219 * * The two operands are scalars. In this case the operation is
220 * applied, resulting in a scalar."
222 if (type_a
->is_scalar() && type_b
->is_scalar())
225 /* "* One operand is a scalar, and the other is a vector or matrix.
226 * In this case, the scalar operation is applied independently to each
227 * component of the vector or matrix, resulting in the same size
230 if (type_a
->is_scalar()) {
231 if (!type_b
->is_scalar())
233 } else if (type_b
->is_scalar()) {
237 /* All of the combinations of <scalar, scalar>, <vector, scalar>,
238 * <scalar, vector>, <scalar, matrix>, and <matrix, scalar> have been
241 assert(!type_a
->is_scalar());
242 assert(!type_b
->is_scalar());
244 /* "* The two operands are vectors of the same size. In this case, the
245 * operation is done component-wise resulting in the same size
248 if (type_a
->is_vector() && type_b
->is_vector()) {
249 if (type_a
== type_b
) {
252 _mesa_glsl_error(loc
, state
,
253 "vector size mismatch for arithmetic operator");
254 return glsl_type::error_type
;
258 /* All of the combinations of <scalar, scalar>, <vector, scalar>,
259 * <scalar, vector>, <scalar, matrix>, <matrix, scalar>, and
260 * <vector, vector> have been handled. At least one of the operands must
261 * be matrix. Further, since there are no integer matrix types, the base
262 * type of both operands must be float.
264 assert(type_a
->is_matrix() || type_b
->is_matrix());
265 assert(type_a
->base_type
== GLSL_TYPE_FLOAT
);
266 assert(type_b
->base_type
== GLSL_TYPE_FLOAT
);
268 /* "* The operator is add (+), subtract (-), or divide (/), and the
269 * operands are matrices with the same number of rows and the same
270 * number of columns. In this case, the operation is done component-
271 * wise resulting in the same size matrix."
272 * * The operator is multiply (*), where both operands are matrices or
273 * one operand is a vector and the other a matrix. A right vector
274 * operand is treated as a column vector and a left vector operand as a
275 * row vector. In all these cases, it is required that the number of
276 * columns of the left operand is equal to the number of rows of the
277 * right operand. Then, the multiply (*) operation does a linear
278 * algebraic multiply, yielding an object that has the same number of
279 * rows as the left operand and the same number of columns as the right
280 * operand. Section 5.10 "Vector and Matrix Operations" explains in
281 * more detail how vectors and matrices are operated on."
284 if (type_a
== type_b
)
287 if (type_a
->is_matrix() && type_b
->is_matrix()) {
288 /* Matrix multiply. The columns of A must match the rows of B. Given
289 * the other previously tested constraints, this means the vector type
290 * of a row from A must be the same as the vector type of a column from
293 if (type_a
->row_type() == type_b
->column_type()) {
294 /* The resulting matrix has the number of columns of matrix B and
295 * the number of rows of matrix A. We get the row count of A by
296 * looking at the size of a vector that makes up a column. The
297 * transpose (size of a row) is done for B.
299 const glsl_type
*const type
=
300 glsl_type::get_instance(type_a
->base_type
,
301 type_a
->column_type()->vector_elements
,
302 type_b
->row_type()->vector_elements
);
303 assert(type
!= glsl_type::error_type
);
307 } else if (type_a
->is_matrix()) {
308 /* A is a matrix and B is a column vector. Columns of A must match
309 * rows of B. Given the other previously tested constraints, this
310 * means the vector type of a row from A must be the same as the
311 * vector the type of B.
313 if (type_a
->row_type() == type_b
) {
314 /* The resulting vector has a number of elements equal to
315 * the number of rows of matrix A. */
316 const glsl_type
*const type
=
317 glsl_type::get_instance(type_a
->base_type
,
318 type_a
->column_type()->vector_elements
,
320 assert(type
!= glsl_type::error_type
);
325 assert(type_b
->is_matrix());
327 /* A is a row vector and B is a matrix. Columns of A must match rows
328 * of B. Given the other previously tested constraints, this means
329 * the type of A must be the same as the vector type of a column from
332 if (type_a
== type_b
->column_type()) {
333 /* The resulting vector has a number of elements equal to
334 * the number of columns of matrix B. */
335 const glsl_type
*const type
=
336 glsl_type::get_instance(type_a
->base_type
,
337 type_b
->row_type()->vector_elements
,
339 assert(type
!= glsl_type::error_type
);
345 _mesa_glsl_error(loc
, state
, "size mismatch for matrix multiplication");
346 return glsl_type::error_type
;
350 /* "All other cases are illegal."
352 _mesa_glsl_error(loc
, state
, "type mismatch");
353 return glsl_type::error_type
;
357 static const struct glsl_type
*
358 unary_arithmetic_result_type(const struct glsl_type
*type
,
359 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
361 /* From GLSL 1.50 spec, page 57:
363 * "The arithmetic unary operators negate (-), post- and pre-increment
364 * and decrement (-- and ++) operate on integer or floating-point
365 * values (including vectors and matrices). All unary operators work
366 * component-wise on their operands. These result with the same type
369 if (!type
->is_numeric()) {
370 _mesa_glsl_error(loc
, state
,
371 "Operands to arithmetic operators must be numeric");
372 return glsl_type::error_type
;
379 * \brief Return the result type of a bit-logic operation.
381 * If the given types to the bit-logic operator are invalid, return
382 * glsl_type::error_type.
384 * \param type_a Type of LHS of bit-logic op
385 * \param type_b Type of RHS of bit-logic op
387 static const struct glsl_type
*
388 bit_logic_result_type(const struct glsl_type
*type_a
,
389 const struct glsl_type
*type_b
,
391 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
393 if (!state
->check_bitwise_operations_allowed(loc
)) {
394 return glsl_type::error_type
;
397 /* From page 50 (page 56 of PDF) of GLSL 1.30 spec:
399 * "The bitwise operators and (&), exclusive-or (^), and inclusive-or
400 * (|). The operands must be of type signed or unsigned integers or
403 if (!type_a
->is_integer()) {
404 _mesa_glsl_error(loc
, state
, "LHS of `%s' must be an integer",
405 ast_expression::operator_string(op
));
406 return glsl_type::error_type
;
408 if (!type_b
->is_integer()) {
409 _mesa_glsl_error(loc
, state
, "RHS of `%s' must be an integer",
410 ast_expression::operator_string(op
));
411 return glsl_type::error_type
;
414 /* "The fundamental types of the operands (signed or unsigned) must
417 if (type_a
->base_type
!= type_b
->base_type
) {
418 _mesa_glsl_error(loc
, state
, "operands of `%s' must have the same "
419 "base type", ast_expression::operator_string(op
));
420 return glsl_type::error_type
;
423 /* "The operands cannot be vectors of differing size." */
424 if (type_a
->is_vector() &&
425 type_b
->is_vector() &&
426 type_a
->vector_elements
!= type_b
->vector_elements
) {
427 _mesa_glsl_error(loc
, state
, "operands of `%s' cannot be vectors of "
428 "different sizes", ast_expression::operator_string(op
));
429 return glsl_type::error_type
;
432 /* "If one operand is a scalar and the other a vector, the scalar is
433 * applied component-wise to the vector, resulting in the same type as
434 * the vector. The fundamental types of the operands [...] will be the
435 * resulting fundamental type."
437 if (type_a
->is_scalar())
443 static const struct glsl_type
*
444 modulus_result_type(const struct glsl_type
*type_a
,
445 const struct glsl_type
*type_b
,
446 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
448 if (!state
->check_version(130, 300, loc
, "operator '%%' is reserved")) {
449 return glsl_type::error_type
;
452 /* From GLSL 1.50 spec, page 56:
453 * "The operator modulus (%) operates on signed or unsigned integers or
454 * integer vectors. The operand types must both be signed or both be
457 if (!type_a
->is_integer()) {
458 _mesa_glsl_error(loc
, state
, "LHS of operator %% must be an integer.");
459 return glsl_type::error_type
;
461 if (!type_b
->is_integer()) {
462 _mesa_glsl_error(loc
, state
, "RHS of operator %% must be an integer.");
463 return glsl_type::error_type
;
465 if (type_a
->base_type
!= type_b
->base_type
) {
466 _mesa_glsl_error(loc
, state
,
467 "operands of %% must have the same base type");
468 return glsl_type::error_type
;
471 /* "The operands cannot be vectors of differing size. If one operand is
472 * a scalar and the other vector, then the scalar is applied component-
473 * wise to the vector, resulting in the same type as the vector. If both
474 * are vectors of the same size, the result is computed component-wise."
476 if (type_a
->is_vector()) {
477 if (!type_b
->is_vector()
478 || (type_a
->vector_elements
== type_b
->vector_elements
))
483 /* "The operator modulus (%) is not defined for any other data types
484 * (non-integer types)."
486 _mesa_glsl_error(loc
, state
, "type mismatch");
487 return glsl_type::error_type
;
491 static const struct glsl_type
*
492 relational_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
493 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
495 const glsl_type
*type_a
= value_a
->type
;
496 const glsl_type
*type_b
= value_b
->type
;
498 /* From GLSL 1.50 spec, page 56:
499 * "The relational operators greater than (>), less than (<), greater
500 * than or equal (>=), and less than or equal (<=) operate only on
501 * scalar integer and scalar floating-point expressions."
503 if (!type_a
->is_numeric()
504 || !type_b
->is_numeric()
505 || !type_a
->is_scalar()
506 || !type_b
->is_scalar()) {
507 _mesa_glsl_error(loc
, state
,
508 "Operands to relational operators must be scalar and "
510 return glsl_type::error_type
;
513 /* "Either the operands' types must match, or the conversions from
514 * Section 4.1.10 "Implicit Conversions" will be applied to the integer
515 * operand, after which the types must match."
517 if (!apply_implicit_conversion(type_a
, value_b
, state
)
518 && !apply_implicit_conversion(type_b
, value_a
, state
)) {
519 _mesa_glsl_error(loc
, state
,
520 "Could not implicitly convert operands to "
521 "relational operator");
522 return glsl_type::error_type
;
524 type_a
= value_a
->type
;
525 type_b
= value_b
->type
;
527 if (type_a
->base_type
!= type_b
->base_type
) {
528 _mesa_glsl_error(loc
, state
, "base type mismatch");
529 return glsl_type::error_type
;
532 /* "The result is scalar Boolean."
534 return glsl_type::bool_type
;
538 * \brief Return the result type of a bit-shift operation.
540 * If the given types to the bit-shift operator are invalid, return
541 * glsl_type::error_type.
543 * \param type_a Type of LHS of bit-shift op
544 * \param type_b Type of RHS of bit-shift op
546 static const struct glsl_type
*
547 shift_result_type(const struct glsl_type
*type_a
,
548 const struct glsl_type
*type_b
,
550 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
552 if (!state
->check_bitwise_operations_allowed(loc
)) {
553 return glsl_type::error_type
;
556 /* From page 50 (page 56 of the PDF) of the GLSL 1.30 spec:
558 * "The shift operators (<<) and (>>). For both operators, the operands
559 * must be signed or unsigned integers or integer vectors. One operand
560 * can be signed while the other is unsigned."
562 if (!type_a
->is_integer()) {
563 _mesa_glsl_error(loc
, state
, "LHS of operator %s must be an integer or "
564 "integer vector", ast_expression::operator_string(op
));
565 return glsl_type::error_type
;
568 if (!type_b
->is_integer()) {
569 _mesa_glsl_error(loc
, state
, "RHS of operator %s must be an integer or "
570 "integer vector", ast_expression::operator_string(op
));
571 return glsl_type::error_type
;
574 /* "If the first operand is a scalar, the second operand has to be
577 if (type_a
->is_scalar() && !type_b
->is_scalar()) {
578 _mesa_glsl_error(loc
, state
, "If the first operand of %s is scalar, the "
579 "second must be scalar as well",
580 ast_expression::operator_string(op
));
581 return glsl_type::error_type
;
584 /* If both operands are vectors, check that they have same number of
587 if (type_a
->is_vector() &&
588 type_b
->is_vector() &&
589 type_a
->vector_elements
!= type_b
->vector_elements
) {
590 _mesa_glsl_error(loc
, state
, "Vector operands to operator %s must "
591 "have same number of elements",
592 ast_expression::operator_string(op
));
593 return glsl_type::error_type
;
596 /* "In all cases, the resulting type will be the same type as the left
603 * Validates that a value can be assigned to a location with a specified type
605 * Validates that \c rhs can be assigned to some location. If the types are
606 * not an exact match but an automatic conversion is possible, \c rhs will be
610 * \c NULL if \c rhs cannot be assigned to a location with type \c lhs_type.
611 * Otherwise the actual RHS to be assigned will be returned. This may be
612 * \c rhs, or it may be \c rhs after some type conversion.
615 * In addition to being used for assignments, this function is used to
616 * type-check return values.
619 validate_assignment(struct _mesa_glsl_parse_state
*state
,
620 const glsl_type
*lhs_type
, ir_rvalue
*rhs
,
623 /* If there is already some error in the RHS, just return it. Anything
624 * else will lead to an avalanche of error message back to the user.
626 if (rhs
->type
->is_error())
629 /* If the types are identical, the assignment can trivially proceed.
631 if (rhs
->type
== lhs_type
)
634 /* If the array element types are the same and the size of the LHS is zero,
635 * the assignment is okay for initializers embedded in variable
638 * Note: Whole-array assignments are not permitted in GLSL 1.10, but this
639 * is handled by ir_dereference::is_lvalue.
641 if (is_initializer
&& lhs_type
->is_array() && rhs
->type
->is_array()
642 && (lhs_type
->element_type() == rhs
->type
->element_type())
643 && (lhs_type
->array_size() == 0)) {
647 /* Check for implicit conversion in GLSL 1.20 */
648 if (apply_implicit_conversion(lhs_type
, rhs
, state
)) {
649 if (rhs
->type
== lhs_type
)
657 mark_whole_array_access(ir_rvalue
*access
)
659 ir_dereference_variable
*deref
= access
->as_dereference_variable();
661 if (deref
&& deref
->var
) {
662 deref
->var
->max_array_access
= deref
->type
->length
- 1;
667 do_assignment(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
,
668 const char *non_lvalue_description
,
669 ir_rvalue
*lhs
, ir_rvalue
*rhs
, bool is_initializer
,
673 bool error_emitted
= (lhs
->type
->is_error() || rhs
->type
->is_error());
675 ir_variable
*lhs_var
= lhs
->variable_referenced();
677 lhs_var
->assigned
= true;
679 if (!error_emitted
) {
680 if (non_lvalue_description
!= NULL
) {
681 _mesa_glsl_error(&lhs_loc
, state
,
683 non_lvalue_description
);
684 error_emitted
= true;
685 } else if (lhs
->variable_referenced() != NULL
686 && lhs
->variable_referenced()->read_only
) {
687 _mesa_glsl_error(&lhs_loc
, state
,
688 "assignment to read-only variable '%s'",
689 lhs
->variable_referenced()->name
);
690 error_emitted
= true;
692 } else if (lhs
->type
->is_array() &&
693 !state
->check_version(120, 300, &lhs_loc
,
694 "whole array assignment forbidden")) {
695 /* From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
697 * "Other binary or unary expressions, non-dereferenced
698 * arrays, function names, swizzles with repeated fields,
699 * and constants cannot be l-values."
701 * The restriction on arrays is lifted in GLSL 1.20 and GLSL ES 3.00.
703 error_emitted
= true;
704 } else if (!lhs
->is_lvalue()) {
705 _mesa_glsl_error(& lhs_loc
, state
, "non-lvalue in assignment");
706 error_emitted
= true;
711 validate_assignment(state
, lhs
->type
, rhs
, is_initializer
);
712 if (new_rhs
== NULL
) {
713 _mesa_glsl_error(& lhs_loc
, state
, "type mismatch");
717 /* If the LHS array was not declared with a size, it takes it size from
718 * the RHS. If the LHS is an l-value and a whole array, it must be a
719 * dereference of a variable. Any other case would require that the LHS
720 * is either not an l-value or not a whole array.
722 if (lhs
->type
->array_size() == 0) {
723 ir_dereference
*const d
= lhs
->as_dereference();
727 ir_variable
*const var
= d
->variable_referenced();
731 if (var
->max_array_access
>= unsigned(rhs
->type
->array_size())) {
732 /* FINISHME: This should actually log the location of the RHS. */
733 _mesa_glsl_error(& lhs_loc
, state
, "array size must be > %u due to "
735 var
->max_array_access
);
738 var
->type
= glsl_type::get_array_instance(lhs
->type
->element_type(),
739 rhs
->type
->array_size());
742 mark_whole_array_access(rhs
);
743 mark_whole_array_access(lhs
);
746 /* Most callers of do_assignment (assign, add_assign, pre_inc/dec,
747 * but not post_inc) need the converted assigned value as an rvalue
748 * to handle things like:
752 * So we always just store the computed value being assigned to a
753 * temporary and return a deref of that temporary. If the rvalue
754 * ends up not being used, the temp will get copy-propagated out.
756 ir_variable
*var
= new(ctx
) ir_variable(rhs
->type
, "assignment_tmp",
758 ir_dereference_variable
*deref_var
= new(ctx
) ir_dereference_variable(var
);
759 instructions
->push_tail(var
);
760 instructions
->push_tail(new(ctx
) ir_assignment(deref_var
, rhs
));
761 deref_var
= new(ctx
) ir_dereference_variable(var
);
764 instructions
->push_tail(new(ctx
) ir_assignment(lhs
, deref_var
));
766 return new(ctx
) ir_dereference_variable(var
);
770 get_lvalue_copy(exec_list
*instructions
, ir_rvalue
*lvalue
)
772 void *ctx
= ralloc_parent(lvalue
);
775 var
= new(ctx
) ir_variable(lvalue
->type
, "_post_incdec_tmp",
777 instructions
->push_tail(var
);
778 var
->mode
= ir_var_auto
;
780 instructions
->push_tail(new(ctx
) ir_assignment(new(ctx
) ir_dereference_variable(var
),
783 return new(ctx
) ir_dereference_variable(var
);
788 ast_node::hir(exec_list
*instructions
,
789 struct _mesa_glsl_parse_state
*state
)
798 do_comparison(void *mem_ctx
, int operation
, ir_rvalue
*op0
, ir_rvalue
*op1
)
801 ir_rvalue
*cmp
= NULL
;
803 if (operation
== ir_binop_all_equal
)
804 join_op
= ir_binop_logic_and
;
806 join_op
= ir_binop_logic_or
;
808 switch (op0
->type
->base_type
) {
809 case GLSL_TYPE_FLOAT
:
813 return new(mem_ctx
) ir_expression(operation
, op0
, op1
);
815 case GLSL_TYPE_ARRAY
: {
816 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
817 ir_rvalue
*e0
, *e1
, *result
;
819 e0
= new(mem_ctx
) ir_dereference_array(op0
->clone(mem_ctx
, NULL
),
820 new(mem_ctx
) ir_constant(i
));
821 e1
= new(mem_ctx
) ir_dereference_array(op1
->clone(mem_ctx
, NULL
),
822 new(mem_ctx
) ir_constant(i
));
823 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
826 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
832 mark_whole_array_access(op0
);
833 mark_whole_array_access(op1
);
837 case GLSL_TYPE_STRUCT
: {
838 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
839 ir_rvalue
*e0
, *e1
, *result
;
840 const char *field_name
= op0
->type
->fields
.structure
[i
].name
;
842 e0
= new(mem_ctx
) ir_dereference_record(op0
->clone(mem_ctx
, NULL
),
844 e1
= new(mem_ctx
) ir_dereference_record(op1
->clone(mem_ctx
, NULL
),
846 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
849 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
857 case GLSL_TYPE_ERROR
:
859 case GLSL_TYPE_SAMPLER
:
860 case GLSL_TYPE_INTERFACE
:
861 /* I assume a comparison of a struct containing a sampler just
862 * ignores the sampler present in the type.
868 cmp
= new(mem_ctx
) ir_constant(true);
873 /* For logical operations, we want to ensure that the operands are
874 * scalar booleans. If it isn't, emit an error and return a constant
875 * boolean to avoid triggering cascading error messages.
878 get_scalar_boolean_operand(exec_list
*instructions
,
879 struct _mesa_glsl_parse_state
*state
,
880 ast_expression
*parent_expr
,
882 const char *operand_name
,
885 ast_expression
*expr
= parent_expr
->subexpressions
[operand
];
887 ir_rvalue
*val
= expr
->hir(instructions
, state
);
889 if (val
->type
->is_boolean() && val
->type
->is_scalar())
892 if (!*error_emitted
) {
893 YYLTYPE loc
= expr
->get_location();
894 _mesa_glsl_error(&loc
, state
, "%s of `%s' must be scalar boolean",
896 parent_expr
->operator_string(parent_expr
->oper
));
897 *error_emitted
= true;
900 return new(ctx
) ir_constant(true);
904 * If name refers to a builtin array whose maximum allowed size is less than
905 * size, report an error and return true. Otherwise return false.
908 check_builtin_array_max_size(const char *name
, unsigned size
,
909 YYLTYPE loc
, struct _mesa_glsl_parse_state
*state
)
911 if ((strcmp("gl_TexCoord", name
) == 0)
912 && (size
> state
->Const
.MaxTextureCoords
)) {
913 /* From page 54 (page 60 of the PDF) of the GLSL 1.20 spec:
915 * "The size [of gl_TexCoord] can be at most
916 * gl_MaxTextureCoords."
918 _mesa_glsl_error(&loc
, state
, "`gl_TexCoord' array size cannot "
919 "be larger than gl_MaxTextureCoords (%u)\n",
920 state
->Const
.MaxTextureCoords
);
921 } else if (strcmp("gl_ClipDistance", name
) == 0
922 && size
> state
->Const
.MaxClipPlanes
) {
923 /* From section 7.1 (Vertex Shader Special Variables) of the
926 * "The gl_ClipDistance array is predeclared as unsized and
927 * must be sized by the shader either redeclaring it with a
928 * size or indexing it only with integral constant
929 * expressions. ... The size can be at most
930 * gl_MaxClipDistances."
932 _mesa_glsl_error(&loc
, state
, "`gl_ClipDistance' array size cannot "
933 "be larger than gl_MaxClipDistances (%u)\n",
934 state
->Const
.MaxClipPlanes
);
939 * Create the constant 1, of a which is appropriate for incrementing and
940 * decrementing values of the given GLSL type. For example, if type is vec4,
941 * this creates a constant value of 1.0 having type float.
943 * If the given type is invalid for increment and decrement operators, return
944 * a floating point 1--the error will be detected later.
947 constant_one_for_inc_dec(void *ctx
, const glsl_type
*type
)
949 switch (type
->base_type
) {
951 return new(ctx
) ir_constant((unsigned) 1);
953 return new(ctx
) ir_constant(1);
955 case GLSL_TYPE_FLOAT
:
956 return new(ctx
) ir_constant(1.0f
);
961 ast_expression::hir(exec_list
*instructions
,
962 struct _mesa_glsl_parse_state
*state
)
965 static const int operations
[AST_NUM_OPERATORS
] = {
966 -1, /* ast_assign doesn't convert to ir_expression. */
967 -1, /* ast_plus doesn't convert to ir_expression. */
991 /* Note: The following block of expression types actually convert
992 * to multiple IR instructions.
994 ir_binop_mul
, /* ast_mul_assign */
995 ir_binop_div
, /* ast_div_assign */
996 ir_binop_mod
, /* ast_mod_assign */
997 ir_binop_add
, /* ast_add_assign */
998 ir_binop_sub
, /* ast_sub_assign */
999 ir_binop_lshift
, /* ast_ls_assign */
1000 ir_binop_rshift
, /* ast_rs_assign */
1001 ir_binop_bit_and
, /* ast_and_assign */
1002 ir_binop_bit_xor
, /* ast_xor_assign */
1003 ir_binop_bit_or
, /* ast_or_assign */
1005 -1, /* ast_conditional doesn't convert to ir_expression. */
1006 ir_binop_add
, /* ast_pre_inc. */
1007 ir_binop_sub
, /* ast_pre_dec. */
1008 ir_binop_add
, /* ast_post_inc. */
1009 ir_binop_sub
, /* ast_post_dec. */
1010 -1, /* ast_field_selection doesn't conv to ir_expression. */
1011 -1, /* ast_array_index doesn't convert to ir_expression. */
1012 -1, /* ast_function_call doesn't conv to ir_expression. */
1013 -1, /* ast_identifier doesn't convert to ir_expression. */
1014 -1, /* ast_int_constant doesn't convert to ir_expression. */
1015 -1, /* ast_uint_constant doesn't conv to ir_expression. */
1016 -1, /* ast_float_constant doesn't conv to ir_expression. */
1017 -1, /* ast_bool_constant doesn't conv to ir_expression. */
1018 -1, /* ast_sequence doesn't convert to ir_expression. */
1020 ir_rvalue
*result
= NULL
;
1022 const struct glsl_type
*type
; /* a temporary variable for switch cases */
1023 bool error_emitted
= false;
1026 loc
= this->get_location();
1028 switch (this->oper
) {
1030 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1031 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1033 result
= do_assignment(instructions
, state
,
1034 this->subexpressions
[0]->non_lvalue_description
,
1035 op
[0], op
[1], false,
1036 this->subexpressions
[0]->get_location());
1037 error_emitted
= result
->type
->is_error();
1042 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1044 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1046 error_emitted
= type
->is_error();
1052 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1054 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1056 error_emitted
= type
->is_error();
1058 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1066 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1067 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1069 type
= arithmetic_result_type(op
[0], op
[1],
1070 (this->oper
== ast_mul
),
1072 error_emitted
= type
->is_error();
1074 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1079 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1080 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1082 type
= modulus_result_type(op
[0]->type
, op
[1]->type
, state
, & loc
);
1084 assert(operations
[this->oper
] == ir_binop_mod
);
1086 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1088 error_emitted
= type
->is_error();
1093 if (!state
->check_bitwise_operations_allowed(&loc
)) {
1094 error_emitted
= true;
1097 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1098 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1099 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1101 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1103 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1110 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1111 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1113 type
= relational_result_type(op
[0], op
[1], state
, & loc
);
1115 /* The relational operators must either generate an error or result
1116 * in a scalar boolean. See page 57 of the GLSL 1.50 spec.
1118 assert(type
->is_error()
1119 || ((type
->base_type
== GLSL_TYPE_BOOL
)
1120 && type
->is_scalar()));
1122 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1124 error_emitted
= type
->is_error();
1129 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1130 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1132 /* From page 58 (page 64 of the PDF) of the GLSL 1.50 spec:
1134 * "The equality operators equal (==), and not equal (!=)
1135 * operate on all types. They result in a scalar Boolean. If
1136 * the operand types do not match, then there must be a
1137 * conversion from Section 4.1.10 "Implicit Conversions"
1138 * applied to one operand that can make them match, in which
1139 * case this conversion is done."
1141 if ((!apply_implicit_conversion(op
[0]->type
, op
[1], state
)
1142 && !apply_implicit_conversion(op
[1]->type
, op
[0], state
))
1143 || (op
[0]->type
!= op
[1]->type
)) {
1144 _mesa_glsl_error(& loc
, state
, "operands of `%s' must have the same "
1145 "type", (this->oper
== ast_equal
) ? "==" : "!=");
1146 error_emitted
= true;
1147 } else if ((op
[0]->type
->is_array() || op
[1]->type
->is_array()) &&
1148 !state
->check_version(120, 300, &loc
,
1149 "array comparisons forbidden")) {
1150 error_emitted
= true;
1153 if (error_emitted
) {
1154 result
= new(ctx
) ir_constant(false);
1156 result
= do_comparison(ctx
, operations
[this->oper
], op
[0], op
[1]);
1157 assert(result
->type
== glsl_type::bool_type
);
1164 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1165 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1166 type
= bit_logic_result_type(op
[0]->type
, op
[1]->type
, this->oper
,
1168 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1170 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1174 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1176 if (!state
->check_bitwise_operations_allowed(&loc
)) {
1177 error_emitted
= true;
1180 if (!op
[0]->type
->is_integer()) {
1181 _mesa_glsl_error(&loc
, state
, "operand of `~' must be an integer");
1182 error_emitted
= true;
1185 type
= error_emitted
? glsl_type::error_type
: op
[0]->type
;
1186 result
= new(ctx
) ir_expression(ir_unop_bit_not
, type
, op
[0], NULL
);
1189 case ast_logic_and
: {
1190 exec_list rhs_instructions
;
1191 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1192 "LHS", &error_emitted
);
1193 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1194 "RHS", &error_emitted
);
1196 if (rhs_instructions
.is_empty()) {
1197 result
= new(ctx
) ir_expression(ir_binop_logic_and
, op
[0], op
[1]);
1198 type
= result
->type
;
1200 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1203 instructions
->push_tail(tmp
);
1205 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1206 instructions
->push_tail(stmt
);
1208 stmt
->then_instructions
.append_list(&rhs_instructions
);
1209 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1210 ir_assignment
*const then_assign
=
1211 new(ctx
) ir_assignment(then_deref
, op
[1]);
1212 stmt
->then_instructions
.push_tail(then_assign
);
1214 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1215 ir_assignment
*const else_assign
=
1216 new(ctx
) ir_assignment(else_deref
, new(ctx
) ir_constant(false));
1217 stmt
->else_instructions
.push_tail(else_assign
);
1219 result
= new(ctx
) ir_dereference_variable(tmp
);
1225 case ast_logic_or
: {
1226 exec_list rhs_instructions
;
1227 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1228 "LHS", &error_emitted
);
1229 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1230 "RHS", &error_emitted
);
1232 if (rhs_instructions
.is_empty()) {
1233 result
= new(ctx
) ir_expression(ir_binop_logic_or
, op
[0], op
[1]);
1234 type
= result
->type
;
1236 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1239 instructions
->push_tail(tmp
);
1241 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1242 instructions
->push_tail(stmt
);
1244 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1245 ir_assignment
*const then_assign
=
1246 new(ctx
) ir_assignment(then_deref
, new(ctx
) ir_constant(true));
1247 stmt
->then_instructions
.push_tail(then_assign
);
1249 stmt
->else_instructions
.append_list(&rhs_instructions
);
1250 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1251 ir_assignment
*const else_assign
=
1252 new(ctx
) ir_assignment(else_deref
, op
[1]);
1253 stmt
->else_instructions
.push_tail(else_assign
);
1255 result
= new(ctx
) ir_dereference_variable(tmp
);
1262 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1264 * "The logical binary operators and (&&), or ( | | ), and
1265 * exclusive or (^^). They operate only on two Boolean
1266 * expressions and result in a Boolean expression."
1268 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0, "LHS",
1270 op
[1] = get_scalar_boolean_operand(instructions
, state
, this, 1, "RHS",
1273 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1278 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1279 "operand", &error_emitted
);
1281 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1285 case ast_mul_assign
:
1286 case ast_div_assign
:
1287 case ast_add_assign
:
1288 case ast_sub_assign
: {
1289 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1290 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1292 type
= arithmetic_result_type(op
[0], op
[1],
1293 (this->oper
== ast_mul_assign
),
1296 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1299 result
= do_assignment(instructions
, state
,
1300 this->subexpressions
[0]->non_lvalue_description
,
1301 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1302 this->subexpressions
[0]->get_location());
1303 error_emitted
= (op
[0]->type
->is_error());
1305 /* GLSL 1.10 does not allow array assignment. However, we don't have to
1306 * explicitly test for this because none of the binary expression
1307 * operators allow array operands either.
1313 case ast_mod_assign
: {
1314 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1315 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1317 type
= modulus_result_type(op
[0]->type
, op
[1]->type
, state
, & loc
);
1319 assert(operations
[this->oper
] == ir_binop_mod
);
1321 ir_rvalue
*temp_rhs
;
1322 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1325 result
= do_assignment(instructions
, state
,
1326 this->subexpressions
[0]->non_lvalue_description
,
1327 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1328 this->subexpressions
[0]->get_location());
1329 error_emitted
= type
->is_error();
1334 case ast_rs_assign
: {
1335 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1336 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1337 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1339 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1340 type
, op
[0], op
[1]);
1341 result
= do_assignment(instructions
, state
,
1342 this->subexpressions
[0]->non_lvalue_description
,
1343 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1344 this->subexpressions
[0]->get_location());
1345 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1349 case ast_and_assign
:
1350 case ast_xor_assign
:
1351 case ast_or_assign
: {
1352 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1353 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1354 type
= bit_logic_result_type(op
[0]->type
, op
[1]->type
, this->oper
,
1356 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1357 type
, op
[0], op
[1]);
1358 result
= do_assignment(instructions
, state
,
1359 this->subexpressions
[0]->non_lvalue_description
,
1360 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1361 this->subexpressions
[0]->get_location());
1362 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1366 case ast_conditional
: {
1367 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1369 * "The ternary selection operator (?:). It operates on three
1370 * expressions (exp1 ? exp2 : exp3). This operator evaluates the
1371 * first expression, which must result in a scalar Boolean."
1373 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1374 "condition", &error_emitted
);
1376 /* The :? operator is implemented by generating an anonymous temporary
1377 * followed by an if-statement. The last instruction in each branch of
1378 * the if-statement assigns a value to the anonymous temporary. This
1379 * temporary is the r-value of the expression.
1381 exec_list then_instructions
;
1382 exec_list else_instructions
;
1384 op
[1] = this->subexpressions
[1]->hir(&then_instructions
, state
);
1385 op
[2] = this->subexpressions
[2]->hir(&else_instructions
, state
);
1387 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1389 * "The second and third expressions can be any type, as
1390 * long their types match, or there is a conversion in
1391 * Section 4.1.10 "Implicit Conversions" that can be applied
1392 * to one of the expressions to make their types match. This
1393 * resulting matching type is the type of the entire
1396 if ((!apply_implicit_conversion(op
[1]->type
, op
[2], state
)
1397 && !apply_implicit_conversion(op
[2]->type
, op
[1], state
))
1398 || (op
[1]->type
!= op
[2]->type
)) {
1399 YYLTYPE loc
= this->subexpressions
[1]->get_location();
1401 _mesa_glsl_error(& loc
, state
, "Second and third operands of ?: "
1402 "operator must have matching types.");
1403 error_emitted
= true;
1404 type
= glsl_type::error_type
;
1409 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1411 * "The second and third expressions must be the same type, but can
1412 * be of any type other than an array."
1414 if (type
->is_array() &&
1415 !state
->check_version(120, 300, &loc
,
1416 "Second and third operands of ?: operator "
1417 "cannot be arrays")) {
1418 error_emitted
= true;
1421 ir_constant
*cond_val
= op
[0]->constant_expression_value();
1422 ir_constant
*then_val
= op
[1]->constant_expression_value();
1423 ir_constant
*else_val
= op
[2]->constant_expression_value();
1425 if (then_instructions
.is_empty()
1426 && else_instructions
.is_empty()
1427 && (cond_val
!= NULL
) && (then_val
!= NULL
) && (else_val
!= NULL
)) {
1428 result
= (cond_val
->value
.b
[0]) ? then_val
: else_val
;
1430 ir_variable
*const tmp
=
1431 new(ctx
) ir_variable(type
, "conditional_tmp", ir_var_temporary
);
1432 instructions
->push_tail(tmp
);
1434 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1435 instructions
->push_tail(stmt
);
1437 then_instructions
.move_nodes_to(& stmt
->then_instructions
);
1438 ir_dereference
*const then_deref
=
1439 new(ctx
) ir_dereference_variable(tmp
);
1440 ir_assignment
*const then_assign
=
1441 new(ctx
) ir_assignment(then_deref
, op
[1]);
1442 stmt
->then_instructions
.push_tail(then_assign
);
1444 else_instructions
.move_nodes_to(& stmt
->else_instructions
);
1445 ir_dereference
*const else_deref
=
1446 new(ctx
) ir_dereference_variable(tmp
);
1447 ir_assignment
*const else_assign
=
1448 new(ctx
) ir_assignment(else_deref
, op
[2]);
1449 stmt
->else_instructions
.push_tail(else_assign
);
1451 result
= new(ctx
) ir_dereference_variable(tmp
);
1458 this->non_lvalue_description
= (this->oper
== ast_pre_inc
)
1459 ? "pre-increment operation" : "pre-decrement operation";
1461 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1462 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1464 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1466 ir_rvalue
*temp_rhs
;
1467 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1470 result
= do_assignment(instructions
, state
,
1471 this->subexpressions
[0]->non_lvalue_description
,
1472 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1473 this->subexpressions
[0]->get_location());
1474 error_emitted
= op
[0]->type
->is_error();
1479 case ast_post_dec
: {
1480 this->non_lvalue_description
= (this->oper
== ast_post_inc
)
1481 ? "post-increment operation" : "post-decrement operation";
1482 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1483 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1485 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1487 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1489 ir_rvalue
*temp_rhs
;
1490 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1493 /* Get a temporary of a copy of the lvalue before it's modified.
1494 * This may get thrown away later.
1496 result
= get_lvalue_copy(instructions
, op
[0]->clone(ctx
, NULL
));
1498 (void)do_assignment(instructions
, state
,
1499 this->subexpressions
[0]->non_lvalue_description
,
1500 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1501 this->subexpressions
[0]->get_location());
1503 error_emitted
= op
[0]->type
->is_error();
1507 case ast_field_selection
:
1508 result
= _mesa_ast_field_selection_to_hir(this, instructions
, state
);
1511 case ast_array_index
: {
1512 YYLTYPE index_loc
= subexpressions
[1]->get_location();
1514 op
[0] = subexpressions
[0]->hir(instructions
, state
);
1515 op
[1] = subexpressions
[1]->hir(instructions
, state
);
1517 result
= _mesa_ast_array_index_to_hir(ctx
, state
, op
[0], op
[1],
1520 if (result
->type
->is_error())
1521 error_emitted
= true;
1526 case ast_function_call
:
1527 /* Should *NEVER* get here. ast_function_call should always be handled
1528 * by ast_function_expression::hir.
1533 case ast_identifier
: {
1534 /* ast_identifier can appear several places in a full abstract syntax
1535 * tree. This particular use must be at location specified in the grammar
1536 * as 'variable_identifier'.
1539 state
->symbols
->get_variable(this->primary_expression
.identifier
);
1543 result
= new(ctx
) ir_dereference_variable(var
);
1545 _mesa_glsl_error(& loc
, state
, "`%s' undeclared",
1546 this->primary_expression
.identifier
);
1548 result
= ir_rvalue::error_value(ctx
);
1549 error_emitted
= true;
1554 case ast_int_constant
:
1555 result
= new(ctx
) ir_constant(this->primary_expression
.int_constant
);
1558 case ast_uint_constant
:
1559 result
= new(ctx
) ir_constant(this->primary_expression
.uint_constant
);
1562 case ast_float_constant
:
1563 result
= new(ctx
) ir_constant(this->primary_expression
.float_constant
);
1566 case ast_bool_constant
:
1567 result
= new(ctx
) ir_constant(bool(this->primary_expression
.bool_constant
));
1570 case ast_sequence
: {
1571 /* It should not be possible to generate a sequence in the AST without
1572 * any expressions in it.
1574 assert(!this->expressions
.is_empty());
1576 /* The r-value of a sequence is the last expression in the sequence. If
1577 * the other expressions in the sequence do not have side-effects (and
1578 * therefore add instructions to the instruction list), they get dropped
1581 exec_node
*previous_tail_pred
= NULL
;
1582 YYLTYPE previous_operand_loc
= loc
;
1584 foreach_list_typed (ast_node
, ast
, link
, &this->expressions
) {
1585 /* If one of the operands of comma operator does not generate any
1586 * code, we want to emit a warning. At each pass through the loop
1587 * previous_tail_pred will point to the last instruction in the
1588 * stream *before* processing the previous operand. Naturally,
1589 * instructions->tail_pred will point to the last instruction in the
1590 * stream *after* processing the previous operand. If the two
1591 * pointers match, then the previous operand had no effect.
1593 * The warning behavior here differs slightly from GCC. GCC will
1594 * only emit a warning if none of the left-hand operands have an
1595 * effect. However, it will emit a warning for each. I believe that
1596 * there are some cases in C (especially with GCC extensions) where
1597 * it is useful to have an intermediate step in a sequence have no
1598 * effect, but I don't think these cases exist in GLSL. Either way,
1599 * it would be a giant hassle to replicate that behavior.
1601 if (previous_tail_pred
== instructions
->tail_pred
) {
1602 _mesa_glsl_warning(&previous_operand_loc
, state
,
1603 "left-hand operand of comma expression has "
1607 /* tail_pred is directly accessed instead of using the get_tail()
1608 * method for performance reasons. get_tail() has extra code to
1609 * return NULL when the list is empty. We don't care about that
1610 * here, so using tail_pred directly is fine.
1612 previous_tail_pred
= instructions
->tail_pred
;
1613 previous_operand_loc
= ast
->get_location();
1615 result
= ast
->hir(instructions
, state
);
1618 /* Any errors should have already been emitted in the loop above.
1620 error_emitted
= true;
1624 type
= NULL
; /* use result->type, not type. */
1625 assert(result
!= NULL
);
1627 if (result
->type
->is_error() && !error_emitted
)
1628 _mesa_glsl_error(& loc
, state
, "type mismatch");
1635 ast_expression_statement::hir(exec_list
*instructions
,
1636 struct _mesa_glsl_parse_state
*state
)
1638 /* It is possible to have expression statements that don't have an
1639 * expression. This is the solitary semicolon:
1641 * for (i = 0; i < 5; i++)
1644 * In this case the expression will be NULL. Test for NULL and don't do
1645 * anything in that case.
1647 if (expression
!= NULL
)
1648 expression
->hir(instructions
, state
);
1650 /* Statements do not have r-values.
1657 ast_compound_statement::hir(exec_list
*instructions
,
1658 struct _mesa_glsl_parse_state
*state
)
1661 state
->symbols
->push_scope();
1663 foreach_list_typed (ast_node
, ast
, link
, &this->statements
)
1664 ast
->hir(instructions
, state
);
1667 state
->symbols
->pop_scope();
1669 /* Compound statements do not have r-values.
1675 static const glsl_type
*
1676 process_array_type(YYLTYPE
*loc
, const glsl_type
*base
, ast_node
*array_size
,
1677 struct _mesa_glsl_parse_state
*state
)
1679 unsigned length
= 0;
1682 return glsl_type::error_type
;
1684 /* From page 19 (page 25) of the GLSL 1.20 spec:
1686 * "Only one-dimensional arrays may be declared."
1688 if (base
->is_array()) {
1689 _mesa_glsl_error(loc
, state
,
1690 "invalid array of `%s' (only one-dimensional arrays "
1693 return glsl_type::error_type
;
1696 if (array_size
!= NULL
) {
1697 exec_list dummy_instructions
;
1698 ir_rvalue
*const ir
= array_size
->hir(& dummy_instructions
, state
);
1699 YYLTYPE loc
= array_size
->get_location();
1702 if (!ir
->type
->is_integer()) {
1703 _mesa_glsl_error(& loc
, state
, "array size must be integer type");
1704 } else if (!ir
->type
->is_scalar()) {
1705 _mesa_glsl_error(& loc
, state
, "array size must be scalar type");
1707 ir_constant
*const size
= ir
->constant_expression_value();
1710 _mesa_glsl_error(& loc
, state
, "array size must be a "
1711 "constant valued expression");
1712 } else if (size
->value
.i
[0] <= 0) {
1713 _mesa_glsl_error(& loc
, state
, "array size must be > 0");
1715 assert(size
->type
== ir
->type
);
1716 length
= size
->value
.u
[0];
1718 /* If the array size is const (and we've verified that
1719 * it is) then no instructions should have been emitted
1720 * when we converted it to HIR. If they were emitted,
1721 * then either the array size isn't const after all, or
1722 * we are emitting unnecessary instructions.
1724 assert(dummy_instructions
.is_empty());
1728 } else if (state
->es_shader
) {
1729 /* Section 10.17 of the GLSL ES 1.00 specification states that unsized
1730 * array declarations have been removed from the language.
1732 _mesa_glsl_error(loc
, state
, "unsized array declarations are not "
1733 "allowed in GLSL ES 1.00.");
1736 const glsl_type
*array_type
= glsl_type::get_array_instance(base
, length
);
1737 return array_type
!= NULL
? array_type
: glsl_type::error_type
;
1742 ast_type_specifier::glsl_type(const char **name
,
1743 struct _mesa_glsl_parse_state
*state
) const
1745 const struct glsl_type
*type
;
1747 type
= state
->symbols
->get_type(this->type_name
);
1748 *name
= this->type_name
;
1750 if (this->is_array
) {
1751 YYLTYPE loc
= this->get_location();
1752 type
= process_array_type(&loc
, type
, this->array_size
, state
);
1760 * Determine whether a toplevel variable declaration declares a varying. This
1761 * function operates by examining the variable's mode and the shader target,
1762 * so it correctly identifies linkage variables regardless of whether they are
1763 * declared using the deprecated "varying" syntax or the new "in/out" syntax.
1765 * Passing a non-toplevel variable declaration (e.g. a function parameter) to
1766 * this function will produce undefined results.
1769 is_varying_var(ir_variable
*var
, _mesa_glsl_parser_targets target
)
1773 return var
->mode
== ir_var_shader_out
;
1774 case fragment_shader
:
1775 return var
->mode
== ir_var_shader_in
;
1777 return var
->mode
== ir_var_shader_out
|| var
->mode
== ir_var_shader_in
;
1783 * Matrix layout qualifiers are only allowed on certain types
1786 validate_matrix_layout_for_type(struct _mesa_glsl_parse_state
*state
,
1788 const glsl_type
*type
)
1790 if (!type
->is_matrix() && !type
->is_record()) {
1791 _mesa_glsl_error(loc
, state
,
1792 "uniform block layout qualifiers row_major and "
1793 "column_major can only be applied to matrix and "
1795 } else if (type
->is_record()) {
1796 /* We allow 'layout(row_major)' on structure types because it's the only
1797 * way to get row-major layouts on matrices contained in structures.
1799 _mesa_glsl_warning(loc
, state
,
1800 "uniform block layout qualifiers row_major and "
1801 "column_major applied to structure types is not "
1802 "strictly conformant and my be rejected by other "
1808 apply_type_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
1810 struct _mesa_glsl_parse_state
*state
,
1812 bool ubo_qualifiers_valid
,
1815 if (qual
->flags
.q
.invariant
) {
1817 _mesa_glsl_error(loc
, state
,
1818 "variable `%s' may not be redeclared "
1819 "`invariant' after being used",
1826 if (qual
->flags
.q
.constant
|| qual
->flags
.q
.attribute
1827 || qual
->flags
.q
.uniform
1828 || (qual
->flags
.q
.varying
&& (state
->target
== fragment_shader
)))
1831 if (qual
->flags
.q
.centroid
)
1834 if (qual
->flags
.q
.attribute
&& state
->target
!= vertex_shader
) {
1835 var
->type
= glsl_type::error_type
;
1836 _mesa_glsl_error(loc
, state
,
1837 "`attribute' variables may not be declared in the "
1839 _mesa_glsl_shader_target_name(state
->target
));
1842 /* If there is no qualifier that changes the mode of the variable, leave
1843 * the setting alone.
1845 if (qual
->flags
.q
.in
&& qual
->flags
.q
.out
)
1846 var
->mode
= ir_var_function_inout
;
1847 else if (qual
->flags
.q
.in
)
1848 var
->mode
= is_parameter
? ir_var_function_in
: ir_var_shader_in
;
1849 else if (qual
->flags
.q
.attribute
1850 || (qual
->flags
.q
.varying
&& (state
->target
== fragment_shader
)))
1851 var
->mode
= ir_var_shader_in
;
1852 else if (qual
->flags
.q
.out
)
1853 var
->mode
= is_parameter
? ir_var_function_out
: ir_var_shader_out
;
1854 else if (qual
->flags
.q
.varying
&& (state
->target
== vertex_shader
))
1855 var
->mode
= ir_var_shader_out
;
1856 else if (qual
->flags
.q
.uniform
)
1857 var
->mode
= ir_var_uniform
;
1859 if (!is_parameter
&& is_varying_var(var
, state
->target
)) {
1860 /* This variable is being used to link data between shader stages (in
1861 * pre-glsl-1.30 parlance, it's a "varying"). Check that it has a type
1862 * that is allowed for such purposes.
1864 * From page 25 (page 31 of the PDF) of the GLSL 1.10 spec:
1866 * "The varying qualifier can be used only with the data types
1867 * float, vec2, vec3, vec4, mat2, mat3, and mat4, or arrays of
1870 * This was relaxed in GLSL version 1.30 and GLSL ES version 3.00. From
1871 * page 31 (page 37 of the PDF) of the GLSL 1.30 spec:
1873 * "Fragment inputs can only be signed and unsigned integers and
1874 * integer vectors, float, floating-point vectors, matrices, or
1875 * arrays of these. Structures cannot be input.
1877 * Similar text exists in the section on vertex shader outputs.
1879 * Similar text exists in the GLSL ES 3.00 spec, except that the GLSL ES
1880 * 3.00 spec allows structs as well. Varying structs are also allowed
1883 switch (var
->type
->get_scalar_type()->base_type
) {
1884 case GLSL_TYPE_FLOAT
:
1885 /* Ok in all GLSL versions */
1887 case GLSL_TYPE_UINT
:
1889 if (state
->is_version(130, 300))
1891 _mesa_glsl_error(loc
, state
,
1892 "varying variables must be of base type float in %s",
1893 state
->get_version_string());
1895 case GLSL_TYPE_STRUCT
:
1896 if (state
->is_version(150, 300))
1898 _mesa_glsl_error(loc
, state
,
1899 "varying variables may not be of type struct");
1902 _mesa_glsl_error(loc
, state
, "illegal type for a varying variable");
1907 if (state
->all_invariant
&& (state
->current_function
== NULL
)) {
1908 switch (state
->target
) {
1910 if (var
->mode
== ir_var_shader_out
)
1911 var
->invariant
= true;
1913 case geometry_shader
:
1914 if ((var
->mode
== ir_var_shader_in
)
1915 || (var
->mode
== ir_var_shader_out
))
1916 var
->invariant
= true;
1918 case fragment_shader
:
1919 if (var
->mode
== ir_var_shader_in
)
1920 var
->invariant
= true;
1925 if (qual
->flags
.q
.flat
)
1926 var
->interpolation
= INTERP_QUALIFIER_FLAT
;
1927 else if (qual
->flags
.q
.noperspective
)
1928 var
->interpolation
= INTERP_QUALIFIER_NOPERSPECTIVE
;
1929 else if (qual
->flags
.q
.smooth
)
1930 var
->interpolation
= INTERP_QUALIFIER_SMOOTH
;
1932 var
->interpolation
= INTERP_QUALIFIER_NONE
;
1934 if (var
->interpolation
!= INTERP_QUALIFIER_NONE
&&
1935 !(state
->target
== vertex_shader
&& var
->mode
== ir_var_shader_out
) &&
1936 !(state
->target
== fragment_shader
&& var
->mode
== ir_var_shader_in
)) {
1937 _mesa_glsl_error(loc
, state
,
1938 "interpolation qualifier `%s' can only be applied to "
1939 "vertex shader outputs and fragment shader inputs.",
1940 var
->interpolation_string());
1943 var
->pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
1944 var
->origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
1945 if ((qual
->flags
.q
.origin_upper_left
|| qual
->flags
.q
.pixel_center_integer
)
1946 && (strcmp(var
->name
, "gl_FragCoord") != 0)) {
1947 const char *const qual_string
= (qual
->flags
.q
.origin_upper_left
)
1948 ? "origin_upper_left" : "pixel_center_integer";
1950 _mesa_glsl_error(loc
, state
,
1951 "layout qualifier `%s' can only be applied to "
1952 "fragment shader input `gl_FragCoord'",
1956 if (qual
->flags
.q
.explicit_location
) {
1957 const bool global_scope
= (state
->current_function
== NULL
);
1959 const char *string
= "";
1961 /* In the vertex shader only shader inputs can be given explicit
1964 * In the fragment shader only shader outputs can be given explicit
1967 switch (state
->target
) {
1969 if (!global_scope
|| (var
->mode
!= ir_var_shader_in
)) {
1975 case geometry_shader
:
1976 _mesa_glsl_error(loc
, state
,
1977 "geometry shader variables cannot be given "
1978 "explicit locations\n");
1981 case fragment_shader
:
1982 if (!global_scope
|| (var
->mode
!= ir_var_shader_out
)) {
1990 _mesa_glsl_error(loc
, state
,
1991 "only %s shader %s variables can be given an "
1992 "explicit location\n",
1993 _mesa_glsl_shader_target_name(state
->target
),
1996 var
->explicit_location
= true;
1998 /* This bit of silliness is needed because invalid explicit locations
1999 * are supposed to be flagged during linking. Small negative values
2000 * biased by VERT_ATTRIB_GENERIC0 or FRAG_RESULT_DATA0 could alias
2001 * built-in values (e.g., -16+VERT_ATTRIB_GENERIC0 = VERT_ATTRIB_POS).
2002 * The linker needs to be able to differentiate these cases. This
2003 * ensures that negative values stay negative.
2005 if (qual
->location
>= 0) {
2006 var
->location
= (state
->target
== vertex_shader
)
2007 ? (qual
->location
+ VERT_ATTRIB_GENERIC0
)
2008 : (qual
->location
+ FRAG_RESULT_DATA0
);
2010 var
->location
= qual
->location
;
2013 if (qual
->flags
.q
.explicit_index
) {
2014 /* From the GLSL 4.30 specification, section 4.4.2 (Output
2015 * Layout Qualifiers):
2017 * "It is also a compile-time error if a fragment shader
2018 * sets a layout index to less than 0 or greater than 1."
2020 * Older specifications don't mandate a behavior; we take
2021 * this as a clarification and always generate the error.
2023 if (qual
->index
< 0 || qual
->index
> 1) {
2024 _mesa_glsl_error(loc
, state
,
2025 "explicit index may only be 0 or 1\n");
2027 var
->explicit_index
= true;
2028 var
->index
= qual
->index
;
2032 } else if (qual
->flags
.q
.explicit_index
) {
2033 _mesa_glsl_error(loc
, state
,
2034 "explicit index requires explicit location\n");
2037 /* Does the declaration use the 'layout' keyword?
2039 const bool uses_layout
= qual
->flags
.q
.pixel_center_integer
2040 || qual
->flags
.q
.origin_upper_left
2041 || qual
->flags
.q
.explicit_location
; /* no need for index since it relies on location */
2043 /* Does the declaration use the deprecated 'attribute' or 'varying'
2046 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
2047 || qual
->flags
.q
.varying
;
2049 /* Is the 'layout' keyword used with parameters that allow relaxed checking.
2050 * Many implementations of GL_ARB_fragment_coord_conventions_enable and some
2051 * implementations (only Mesa?) GL_ARB_explicit_attrib_location_enable
2052 * allowed the layout qualifier to be used with 'varying' and 'attribute'.
2053 * These extensions and all following extensions that add the 'layout'
2054 * keyword have been modified to require the use of 'in' or 'out'.
2056 * The following extension do not allow the deprecated keywords:
2058 * GL_AMD_conservative_depth
2059 * GL_ARB_conservative_depth
2060 * GL_ARB_gpu_shader5
2061 * GL_ARB_separate_shader_objects
2062 * GL_ARB_tesselation_shader
2063 * GL_ARB_transform_feedback3
2064 * GL_ARB_uniform_buffer_object
2066 * It is unknown whether GL_EXT_shader_image_load_store or GL_NV_gpu_shader5
2067 * allow layout with the deprecated keywords.
2069 const bool relaxed_layout_qualifier_checking
=
2070 state
->ARB_fragment_coord_conventions_enable
;
2072 if (uses_layout
&& uses_deprecated_qualifier
) {
2073 if (relaxed_layout_qualifier_checking
) {
2074 _mesa_glsl_warning(loc
, state
,
2075 "`layout' qualifier may not be used with "
2076 "`attribute' or `varying'");
2078 _mesa_glsl_error(loc
, state
,
2079 "`layout' qualifier may not be used with "
2080 "`attribute' or `varying'");
2084 /* Layout qualifiers for gl_FragDepth, which are enabled by extension
2085 * AMD_conservative_depth.
2087 int depth_layout_count
= qual
->flags
.q
.depth_any
2088 + qual
->flags
.q
.depth_greater
2089 + qual
->flags
.q
.depth_less
2090 + qual
->flags
.q
.depth_unchanged
;
2091 if (depth_layout_count
> 0
2092 && !state
->AMD_conservative_depth_enable
2093 && !state
->ARB_conservative_depth_enable
) {
2094 _mesa_glsl_error(loc
, state
,
2095 "extension GL_AMD_conservative_depth or "
2096 "GL_ARB_conservative_depth must be enabled "
2097 "to use depth layout qualifiers");
2098 } else if (depth_layout_count
> 0
2099 && strcmp(var
->name
, "gl_FragDepth") != 0) {
2100 _mesa_glsl_error(loc
, state
,
2101 "depth layout qualifiers can be applied only to "
2103 } else if (depth_layout_count
> 1
2104 && strcmp(var
->name
, "gl_FragDepth") == 0) {
2105 _mesa_glsl_error(loc
, state
,
2106 "at most one depth layout qualifier can be applied to "
2109 if (qual
->flags
.q
.depth_any
)
2110 var
->depth_layout
= ir_depth_layout_any
;
2111 else if (qual
->flags
.q
.depth_greater
)
2112 var
->depth_layout
= ir_depth_layout_greater
;
2113 else if (qual
->flags
.q
.depth_less
)
2114 var
->depth_layout
= ir_depth_layout_less
;
2115 else if (qual
->flags
.q
.depth_unchanged
)
2116 var
->depth_layout
= ir_depth_layout_unchanged
;
2118 var
->depth_layout
= ir_depth_layout_none
;
2120 if (qual
->flags
.q
.std140
||
2121 qual
->flags
.q
.packed
||
2122 qual
->flags
.q
.shared
) {
2123 _mesa_glsl_error(loc
, state
,
2124 "uniform block layout qualifiers std140, packed, and "
2125 "shared can only be applied to uniform blocks, not "
2129 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
2130 if (!ubo_qualifiers_valid
) {
2131 _mesa_glsl_error(loc
, state
,
2132 "uniform block layout qualifiers row_major and "
2133 "column_major can only be applied to uniform block "
2136 validate_matrix_layout_for_type(state
, loc
, var
->type
);
2141 * Get the variable that is being redeclared by this declaration
2143 * Semantic checks to verify the validity of the redeclaration are also
2144 * performed. If semantic checks fail, compilation error will be emitted via
2145 * \c _mesa_glsl_error, but a non-\c NULL pointer will still be returned.
2148 * A pointer to an existing variable in the current scope if the declaration
2149 * is a redeclaration, \c NULL otherwise.
2152 get_variable_being_redeclared(ir_variable
*var
, ast_declaration
*decl
,
2153 struct _mesa_glsl_parse_state
*state
)
2155 /* Check if this declaration is actually a re-declaration, either to
2156 * resize an array or add qualifiers to an existing variable.
2158 * This is allowed for variables in the current scope, or when at
2159 * global scope (for built-ins in the implicit outer scope).
2161 ir_variable
*earlier
= state
->symbols
->get_variable(decl
->identifier
);
2162 if (earlier
== NULL
||
2163 (state
->current_function
!= NULL
&&
2164 !state
->symbols
->name_declared_this_scope(decl
->identifier
))) {
2169 YYLTYPE loc
= decl
->get_location();
2171 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec,
2173 * "It is legal to declare an array without a size and then
2174 * later re-declare the same name as an array of the same
2175 * type and specify a size."
2177 if ((earlier
->type
->array_size() == 0)
2178 && var
->type
->is_array()
2179 && (var
->type
->element_type() == earlier
->type
->element_type())) {
2180 /* FINISHME: This doesn't match the qualifiers on the two
2181 * FINISHME: declarations. It's not 100% clear whether this is
2182 * FINISHME: required or not.
2185 const unsigned size
= unsigned(var
->type
->array_size());
2186 check_builtin_array_max_size(var
->name
, size
, loc
, state
);
2187 if ((size
> 0) && (size
<= earlier
->max_array_access
)) {
2188 _mesa_glsl_error(& loc
, state
, "array size must be > %u due to "
2190 earlier
->max_array_access
);
2193 earlier
->type
= var
->type
;
2196 } else if (state
->ARB_fragment_coord_conventions_enable
2197 && strcmp(var
->name
, "gl_FragCoord") == 0
2198 && earlier
->type
== var
->type
2199 && earlier
->mode
== var
->mode
) {
2200 /* Allow redeclaration of gl_FragCoord for ARB_fcc layout
2203 earlier
->origin_upper_left
= var
->origin_upper_left
;
2204 earlier
->pixel_center_integer
= var
->pixel_center_integer
;
2206 /* According to section 4.3.7 of the GLSL 1.30 spec,
2207 * the following built-in varaibles can be redeclared with an
2208 * interpolation qualifier:
2211 * * gl_FrontSecondaryColor
2212 * * gl_BackSecondaryColor
2214 * * gl_SecondaryColor
2216 } else if (state
->is_version(130, 0)
2217 && (strcmp(var
->name
, "gl_FrontColor") == 0
2218 || strcmp(var
->name
, "gl_BackColor") == 0
2219 || strcmp(var
->name
, "gl_FrontSecondaryColor") == 0
2220 || strcmp(var
->name
, "gl_BackSecondaryColor") == 0
2221 || strcmp(var
->name
, "gl_Color") == 0
2222 || strcmp(var
->name
, "gl_SecondaryColor") == 0)
2223 && earlier
->type
== var
->type
2224 && earlier
->mode
== var
->mode
) {
2225 earlier
->interpolation
= var
->interpolation
;
2227 /* Layout qualifiers for gl_FragDepth. */
2228 } else if ((state
->AMD_conservative_depth_enable
||
2229 state
->ARB_conservative_depth_enable
)
2230 && strcmp(var
->name
, "gl_FragDepth") == 0
2231 && earlier
->type
== var
->type
2232 && earlier
->mode
== var
->mode
) {
2234 /** From the AMD_conservative_depth spec:
2235 * Within any shader, the first redeclarations of gl_FragDepth
2236 * must appear before any use of gl_FragDepth.
2238 if (earlier
->used
) {
2239 _mesa_glsl_error(&loc
, state
,
2240 "the first redeclaration of gl_FragDepth "
2241 "must appear before any use of gl_FragDepth");
2244 /* Prevent inconsistent redeclaration of depth layout qualifier. */
2245 if (earlier
->depth_layout
!= ir_depth_layout_none
2246 && earlier
->depth_layout
!= var
->depth_layout
) {
2247 _mesa_glsl_error(&loc
, state
,
2248 "gl_FragDepth: depth layout is declared here "
2249 "as '%s, but it was previously declared as "
2251 depth_layout_string(var
->depth_layout
),
2252 depth_layout_string(earlier
->depth_layout
));
2255 earlier
->depth_layout
= var
->depth_layout
;
2258 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", decl
->identifier
);
2265 * Generate the IR for an initializer in a variable declaration
2268 process_initializer(ir_variable
*var
, ast_declaration
*decl
,
2269 ast_fully_specified_type
*type
,
2270 exec_list
*initializer_instructions
,
2271 struct _mesa_glsl_parse_state
*state
)
2273 ir_rvalue
*result
= NULL
;
2275 YYLTYPE initializer_loc
= decl
->initializer
->get_location();
2277 /* From page 24 (page 30 of the PDF) of the GLSL 1.10 spec:
2279 * "All uniform variables are read-only and are initialized either
2280 * directly by an application via API commands, or indirectly by
2283 if (var
->mode
== ir_var_uniform
) {
2284 state
->check_version(120, 0, &initializer_loc
,
2285 "cannot initialize uniforms");
2288 if (var
->type
->is_sampler()) {
2289 _mesa_glsl_error(& initializer_loc
, state
,
2290 "cannot initialize samplers");
2293 if ((var
->mode
== ir_var_shader_in
) && (state
->current_function
== NULL
)) {
2294 _mesa_glsl_error(& initializer_loc
, state
,
2295 "cannot initialize %s shader input / %s",
2296 _mesa_glsl_shader_target_name(state
->target
),
2297 (state
->target
== vertex_shader
)
2298 ? "attribute" : "varying");
2301 ir_dereference
*const lhs
= new(state
) ir_dereference_variable(var
);
2302 ir_rvalue
*rhs
= decl
->initializer
->hir(initializer_instructions
,
2305 /* Calculate the constant value if this is a const or uniform
2308 if (type
->qualifier
.flags
.q
.constant
2309 || type
->qualifier
.flags
.q
.uniform
) {
2310 ir_rvalue
*new_rhs
= validate_assignment(state
, var
->type
, rhs
, true);
2311 if (new_rhs
!= NULL
) {
2314 ir_constant
*constant_value
= rhs
->constant_expression_value();
2315 if (!constant_value
) {
2316 _mesa_glsl_error(& initializer_loc
, state
,
2317 "initializer of %s variable `%s' must be a "
2318 "constant expression",
2319 (type
->qualifier
.flags
.q
.constant
)
2320 ? "const" : "uniform",
2322 if (var
->type
->is_numeric()) {
2323 /* Reduce cascading errors. */
2324 var
->constant_value
= ir_constant::zero(state
, var
->type
);
2327 rhs
= constant_value
;
2328 var
->constant_value
= constant_value
;
2331 _mesa_glsl_error(&initializer_loc
, state
,
2332 "initializer of type %s cannot be assigned to "
2333 "variable of type %s",
2334 rhs
->type
->name
, var
->type
->name
);
2335 if (var
->type
->is_numeric()) {
2336 /* Reduce cascading errors. */
2337 var
->constant_value
= ir_constant::zero(state
, var
->type
);
2342 if (rhs
&& !rhs
->type
->is_error()) {
2343 bool temp
= var
->read_only
;
2344 if (type
->qualifier
.flags
.q
.constant
)
2345 var
->read_only
= false;
2347 /* Never emit code to initialize a uniform.
2349 const glsl_type
*initializer_type
;
2350 if (!type
->qualifier
.flags
.q
.uniform
) {
2351 result
= do_assignment(initializer_instructions
, state
,
2354 type
->get_location());
2355 initializer_type
= result
->type
;
2357 initializer_type
= rhs
->type
;
2359 var
->constant_initializer
= rhs
->constant_expression_value();
2360 var
->has_initializer
= true;
2362 /* If the declared variable is an unsized array, it must inherrit
2363 * its full type from the initializer. A declaration such as
2365 * uniform float a[] = float[](1.0, 2.0, 3.0, 3.0);
2369 * uniform float a[4] = float[](1.0, 2.0, 3.0, 3.0);
2371 * The assignment generated in the if-statement (below) will also
2372 * automatically handle this case for non-uniforms.
2374 * If the declared variable is not an array, the types must
2375 * already match exactly. As a result, the type assignment
2376 * here can be done unconditionally. For non-uniforms the call
2377 * to do_assignment can change the type of the initializer (via
2378 * the implicit conversion rules). For uniforms the initializer
2379 * must be a constant expression, and the type of that expression
2380 * was validated above.
2382 var
->type
= initializer_type
;
2384 var
->read_only
= temp
;
2391 ast_declarator_list::hir(exec_list
*instructions
,
2392 struct _mesa_glsl_parse_state
*state
)
2395 const struct glsl_type
*decl_type
;
2396 const char *type_name
= NULL
;
2397 ir_rvalue
*result
= NULL
;
2398 YYLTYPE loc
= this->get_location();
2400 /* From page 46 (page 52 of the PDF) of the GLSL 1.50 spec:
2402 * "To ensure that a particular output variable is invariant, it is
2403 * necessary to use the invariant qualifier. It can either be used to
2404 * qualify a previously declared variable as being invariant
2406 * invariant gl_Position; // make existing gl_Position be invariant"
2408 * In these cases the parser will set the 'invariant' flag in the declarator
2409 * list, and the type will be NULL.
2411 if (this->invariant
) {
2412 assert(this->type
== NULL
);
2414 if (state
->current_function
!= NULL
) {
2415 _mesa_glsl_error(& loc
, state
,
2416 "All uses of `invariant' keyword must be at global "
2420 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
2421 assert(!decl
->is_array
);
2422 assert(decl
->array_size
== NULL
);
2423 assert(decl
->initializer
== NULL
);
2425 ir_variable
*const earlier
=
2426 state
->symbols
->get_variable(decl
->identifier
);
2427 if (earlier
== NULL
) {
2428 _mesa_glsl_error(& loc
, state
,
2429 "Undeclared variable `%s' cannot be marked "
2430 "invariant\n", decl
->identifier
);
2431 } else if ((state
->target
== vertex_shader
)
2432 && (earlier
->mode
!= ir_var_shader_out
)) {
2433 _mesa_glsl_error(& loc
, state
,
2434 "`%s' cannot be marked invariant, vertex shader "
2435 "outputs only\n", decl
->identifier
);
2436 } else if ((state
->target
== fragment_shader
)
2437 && (earlier
->mode
!= ir_var_shader_in
)) {
2438 _mesa_glsl_error(& loc
, state
,
2439 "`%s' cannot be marked invariant, fragment shader "
2440 "inputs only\n", decl
->identifier
);
2441 } else if (earlier
->used
) {
2442 _mesa_glsl_error(& loc
, state
,
2443 "variable `%s' may not be redeclared "
2444 "`invariant' after being used",
2447 earlier
->invariant
= true;
2451 /* Invariant redeclarations do not have r-values.
2456 assert(this->type
!= NULL
);
2457 assert(!this->invariant
);
2459 /* The type specifier may contain a structure definition. Process that
2460 * before any of the variable declarations.
2462 (void) this->type
->specifier
->hir(instructions
, state
);
2464 decl_type
= this->type
->specifier
->glsl_type(& type_name
, state
);
2465 if (this->declarations
.is_empty()) {
2466 /* If there is no structure involved in the program text, there are two
2467 * possible scenarios:
2469 * - The program text contained something like 'vec4;'. This is an
2470 * empty declaration. It is valid but weird. Emit a warning.
2472 * - The program text contained something like 'S;' and 'S' is not the
2473 * name of a known structure type. This is both invalid and weird.
2476 * Note that if decl_type is NULL and there is a structure involved,
2477 * there must have been some sort of error with the structure. In this
2478 * case we assume that an error was already generated on this line of
2479 * code for the structure. There is no need to generate an additional,
2482 assert(this->type
->specifier
->structure
== NULL
|| decl_type
!= NULL
2484 if (this->type
->specifier
->structure
== NULL
) {
2485 if (decl_type
!= NULL
) {
2486 _mesa_glsl_warning(&loc
, state
, "empty declaration");
2488 _mesa_glsl_error(&loc
, state
,
2489 "invalid type `%s' in empty declaration",
2495 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
2496 const struct glsl_type
*var_type
;
2499 /* FINISHME: Emit a warning if a variable declaration shadows a
2500 * FINISHME: declaration at a higher scope.
2503 if ((decl_type
== NULL
) || decl_type
->is_void()) {
2504 if (type_name
!= NULL
) {
2505 _mesa_glsl_error(& loc
, state
,
2506 "invalid type `%s' in declaration of `%s'",
2507 type_name
, decl
->identifier
);
2509 _mesa_glsl_error(& loc
, state
,
2510 "invalid type in declaration of `%s'",
2516 if (decl
->is_array
) {
2517 var_type
= process_array_type(&loc
, decl_type
, decl
->array_size
,
2519 if (var_type
->is_error())
2522 var_type
= decl_type
;
2525 var
= new(ctx
) ir_variable(var_type
, decl
->identifier
, ir_var_auto
);
2527 /* From page 22 (page 28 of the PDF) of the GLSL 1.10 specification;
2529 * "Global variables can only use the qualifiers const,
2530 * attribute, uni form, or varying. Only one may be
2533 * Local variables can only use the qualifier const."
2535 * This is relaxed in GLSL 1.30 and GLSL ES 3.00. It is also relaxed by
2536 * any extension that adds the 'layout' keyword.
2538 if (!state
->is_version(130, 300)
2539 && !state
->ARB_explicit_attrib_location_enable
2540 && !state
->ARB_fragment_coord_conventions_enable
) {
2541 if (this->type
->qualifier
.flags
.q
.out
) {
2542 _mesa_glsl_error(& loc
, state
,
2543 "`out' qualifier in declaration of `%s' "
2544 "only valid for function parameters in %s.",
2545 decl
->identifier
, state
->get_version_string());
2547 if (this->type
->qualifier
.flags
.q
.in
) {
2548 _mesa_glsl_error(& loc
, state
,
2549 "`in' qualifier in declaration of `%s' "
2550 "only valid for function parameters in %s.",
2551 decl
->identifier
, state
->get_version_string());
2553 /* FINISHME: Test for other invalid qualifiers. */
2556 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
,
2557 & loc
, this->ubo_qualifiers_valid
, false);
2559 if (this->type
->qualifier
.flags
.q
.invariant
) {
2560 if ((state
->target
== vertex_shader
) &&
2561 var
->mode
!= ir_var_shader_out
) {
2562 _mesa_glsl_error(& loc
, state
,
2563 "`%s' cannot be marked invariant, vertex shader "
2564 "outputs only\n", var
->name
);
2565 } else if ((state
->target
== fragment_shader
) &&
2566 var
->mode
!= ir_var_shader_in
) {
2567 /* FINISHME: Note that this doesn't work for invariant on
2568 * a function signature inval
2570 _mesa_glsl_error(& loc
, state
,
2571 "`%s' cannot be marked invariant, fragment shader "
2572 "inputs only\n", var
->name
);
2576 if (state
->current_function
!= NULL
) {
2577 const char *mode
= NULL
;
2578 const char *extra
= "";
2580 /* There is no need to check for 'inout' here because the parser will
2581 * only allow that in function parameter lists.
2583 if (this->type
->qualifier
.flags
.q
.attribute
) {
2585 } else if (this->type
->qualifier
.flags
.q
.uniform
) {
2587 } else if (this->type
->qualifier
.flags
.q
.varying
) {
2589 } else if (this->type
->qualifier
.flags
.q
.in
) {
2591 extra
= " or in function parameter list";
2592 } else if (this->type
->qualifier
.flags
.q
.out
) {
2594 extra
= " or in function parameter list";
2598 _mesa_glsl_error(& loc
, state
,
2599 "%s variable `%s' must be declared at "
2601 mode
, var
->name
, extra
);
2603 } else if (var
->mode
== ir_var_shader_in
) {
2604 var
->read_only
= true;
2606 if (state
->target
== vertex_shader
) {
2607 bool error_emitted
= false;
2609 /* From page 31 (page 37 of the PDF) of the GLSL 1.50 spec:
2611 * "Vertex shader inputs can only be float, floating-point
2612 * vectors, matrices, signed and unsigned integers and integer
2613 * vectors. Vertex shader inputs can also form arrays of these
2614 * types, but not structures."
2616 * From page 31 (page 27 of the PDF) of the GLSL 1.30 spec:
2618 * "Vertex shader inputs can only be float, floating-point
2619 * vectors, matrices, signed and unsigned integers and integer
2620 * vectors. They cannot be arrays or structures."
2622 * From page 23 (page 29 of the PDF) of the GLSL 1.20 spec:
2624 * "The attribute qualifier can be used only with float,
2625 * floating-point vectors, and matrices. Attribute variables
2626 * cannot be declared as arrays or structures."
2628 * From page 33 (page 39 of the PDF) of the GLSL ES 3.00 spec:
2630 * "Vertex shader inputs can only be float, floating-point
2631 * vectors, matrices, signed and unsigned integers and integer
2632 * vectors. Vertex shader inputs cannot be arrays or
2635 const glsl_type
*check_type
= var
->type
->is_array()
2636 ? var
->type
->fields
.array
: var
->type
;
2638 switch (check_type
->base_type
) {
2639 case GLSL_TYPE_FLOAT
:
2641 case GLSL_TYPE_UINT
:
2643 if (state
->is_version(120, 300))
2647 _mesa_glsl_error(& loc
, state
,
2648 "vertex shader input / attribute cannot have "
2650 var
->type
->is_array() ? "array of " : "",
2652 error_emitted
= true;
2655 if (!error_emitted
&& var
->type
->is_array() &&
2656 !state
->check_version(140, 0, &loc
,
2657 "vertex shader input / attribute "
2658 "cannot have array type")) {
2659 error_emitted
= true;
2664 /* Integer fragment inputs must be qualified with 'flat'. In GLSL ES,
2665 * so must integer vertex outputs.
2667 * From section 4.3.4 ("Inputs") of the GLSL 1.50 spec:
2668 * "Fragment shader inputs that are signed or unsigned integers or
2669 * integer vectors must be qualified with the interpolation qualifier
2672 * From section 4.3.4 ("Input Variables") of the GLSL 3.00 ES spec:
2673 * "Fragment shader inputs that are, or contain, signed or unsigned
2674 * integers or integer vectors must be qualified with the
2675 * interpolation qualifier flat."
2677 * From section 4.3.6 ("Output Variables") of the GLSL 3.00 ES spec:
2678 * "Vertex shader outputs that are, or contain, signed or unsigned
2679 * integers or integer vectors must be qualified with the
2680 * interpolation qualifier flat."
2682 * Note that prior to GLSL 1.50, this requirement applied to vertex
2683 * outputs rather than fragment inputs. That creates problems in the
2684 * presence of geometry shaders, so we adopt the GLSL 1.50 rule for all
2685 * desktop GL shaders. For GLSL ES shaders, we follow the spec and
2686 * apply the restriction to both vertex outputs and fragment inputs.
2688 * Note also that the desktop GLSL specs are missing the text "or
2689 * contain"; this is presumably an oversight, since there is no
2690 * reasonable way to interpolate a fragment shader input that contains
2693 if (state
->is_version(130, 300) &&
2694 var
->type
->contains_integer() &&
2695 var
->interpolation
!= INTERP_QUALIFIER_FLAT
&&
2696 ((state
->target
== fragment_shader
&& var
->mode
== ir_var_shader_in
)
2697 || (state
->target
== vertex_shader
&& var
->mode
== ir_var_shader_out
2698 && state
->es_shader
))) {
2699 const char *var_type
= (state
->target
== vertex_shader
) ?
2700 "vertex output" : "fragment input";
2701 _mesa_glsl_error(&loc
, state
, "If a %s is (or contains) "
2702 "an integer, then it must be qualified with 'flat'",
2707 /* Interpolation qualifiers cannot be applied to 'centroid' and
2708 * 'centroid varying'.
2710 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
2711 * "interpolation qualifiers may only precede the qualifiers in,
2712 * centroid in, out, or centroid out in a declaration. They do not apply
2713 * to the deprecated storage qualifiers varying or centroid varying."
2715 * These deprecated storage qualifiers do not exist in GLSL ES 3.00.
2717 if (state
->is_version(130, 0)
2718 && this->type
->qualifier
.has_interpolation()
2719 && this->type
->qualifier
.flags
.q
.varying
) {
2721 const char *i
= this->type
->qualifier
.interpolation_string();
2724 if (this->type
->qualifier
.flags
.q
.centroid
)
2725 s
= "centroid varying";
2729 _mesa_glsl_error(&loc
, state
,
2730 "qualifier '%s' cannot be applied to the "
2731 "deprecated storage qualifier '%s'", i
, s
);
2735 /* Interpolation qualifiers can only apply to vertex shader outputs and
2736 * fragment shader inputs.
2738 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
2739 * "Outputs from a vertex shader (out) and inputs to a fragment
2740 * shader (in) can be further qualified with one or more of these
2741 * interpolation qualifiers"
2743 * From page 31 (page 37 of the PDF) of the GLSL ES 3.00 spec:
2744 * "These interpolation qualifiers may only precede the qualifiers
2745 * in, centroid in, out, or centroid out in a declaration. They do
2746 * not apply to inputs into a vertex shader or outputs from a
2749 if (state
->is_version(130, 300)
2750 && this->type
->qualifier
.has_interpolation()) {
2752 const char *i
= this->type
->qualifier
.interpolation_string();
2755 switch (state
->target
) {
2757 if (this->type
->qualifier
.flags
.q
.in
) {
2758 _mesa_glsl_error(&loc
, state
,
2759 "qualifier '%s' cannot be applied to vertex "
2760 "shader inputs", i
);
2763 case fragment_shader
:
2764 if (this->type
->qualifier
.flags
.q
.out
) {
2765 _mesa_glsl_error(&loc
, state
,
2766 "qualifier '%s' cannot be applied to fragment "
2767 "shader outputs", i
);
2776 /* From section 4.3.4 of the GLSL 1.30 spec:
2777 * "It is an error to use centroid in in a vertex shader."
2779 * From section 4.3.4 of the GLSL ES 3.00 spec:
2780 * "It is an error to use centroid in or interpolation qualifiers in
2781 * a vertex shader input."
2783 if (state
->is_version(130, 300)
2784 && this->type
->qualifier
.flags
.q
.centroid
2785 && this->type
->qualifier
.flags
.q
.in
2786 && state
->target
== vertex_shader
) {
2788 _mesa_glsl_error(&loc
, state
,
2789 "'centroid in' cannot be used in a vertex shader");
2793 /* Precision qualifiers exists only in GLSL versions 1.00 and >= 1.30.
2795 if (this->type
->specifier
->precision
!= ast_precision_none
) {
2796 state
->check_precision_qualifiers_allowed(&loc
);
2800 /* Precision qualifiers only apply to floating point and integer types.
2802 * From section 4.5.2 of the GLSL 1.30 spec:
2803 * "Any floating point or any integer declaration can have the type
2804 * preceded by one of these precision qualifiers [...] Literal
2805 * constants do not have precision qualifiers. Neither do Boolean
2808 * In GLSL ES, sampler types are also allowed.
2810 * From page 87 of the GLSL ES spec:
2811 * "RESOLUTION: Allow sampler types to take a precision qualifier."
2813 if (this->type
->specifier
->precision
!= ast_precision_none
2814 && !var
->type
->is_float()
2815 && !var
->type
->is_integer()
2816 && !(var
->type
->is_sampler() && state
->es_shader
)
2817 && !(var
->type
->is_array()
2818 && (var
->type
->fields
.array
->is_float()
2819 || var
->type
->fields
.array
->is_integer()))) {
2821 _mesa_glsl_error(&loc
, state
,
2822 "precision qualifiers apply only to floating point"
2823 "%s types", state
->es_shader
? ", integer, and sampler"
2827 /* From page 17 (page 23 of the PDF) of the GLSL 1.20 spec:
2829 * "[Sampler types] can only be declared as function
2830 * parameters or uniform variables (see Section 4.3.5
2833 if (var_type
->contains_sampler() &&
2834 !this->type
->qualifier
.flags
.q
.uniform
) {
2835 _mesa_glsl_error(&loc
, state
, "samplers must be declared uniform");
2838 /* Process the initializer and add its instructions to a temporary
2839 * list. This list will be added to the instruction stream (below) after
2840 * the declaration is added. This is done because in some cases (such as
2841 * redeclarations) the declaration may not actually be added to the
2842 * instruction stream.
2844 exec_list initializer_instructions
;
2845 ir_variable
*earlier
= get_variable_being_redeclared(var
, decl
, state
);
2847 if (decl
->initializer
!= NULL
) {
2848 result
= process_initializer((earlier
== NULL
) ? var
: earlier
,
2850 &initializer_instructions
, state
);
2853 /* From page 23 (page 29 of the PDF) of the GLSL 1.10 spec:
2855 * "It is an error to write to a const variable outside of
2856 * its declaration, so they must be initialized when
2859 if (this->type
->qualifier
.flags
.q
.constant
&& decl
->initializer
== NULL
) {
2860 _mesa_glsl_error(& loc
, state
,
2861 "const declaration of `%s' must be initialized",
2865 /* If the declaration is not a redeclaration, there are a few additional
2866 * semantic checks that must be applied. In addition, variable that was
2867 * created for the declaration should be added to the IR stream.
2869 if (earlier
== NULL
) {
2870 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
2872 * "Identifiers starting with "gl_" are reserved for use by
2873 * OpenGL, and may not be declared in a shader as either a
2874 * variable or a function."
2876 if (strncmp(decl
->identifier
, "gl_", 3) == 0)
2877 _mesa_glsl_error(& loc
, state
,
2878 "identifier `%s' uses reserved `gl_' prefix",
2880 else if (strstr(decl
->identifier
, "__")) {
2881 /* From page 14 (page 20 of the PDF) of the GLSL 1.10
2884 * "In addition, all identifiers containing two
2885 * consecutive underscores (__) are reserved as
2886 * possible future keywords."
2888 _mesa_glsl_error(& loc
, state
,
2889 "identifier `%s' uses reserved `__' string",
2893 /* Add the variable to the symbol table. Note that the initializer's
2894 * IR was already processed earlier (though it hasn't been emitted
2895 * yet), without the variable in scope.
2897 * This differs from most C-like languages, but it follows the GLSL
2898 * specification. From page 28 (page 34 of the PDF) of the GLSL 1.50
2901 * "Within a declaration, the scope of a name starts immediately
2902 * after the initializer if present or immediately after the name
2903 * being declared if not."
2905 if (!state
->symbols
->add_variable(var
)) {
2906 YYLTYPE loc
= this->get_location();
2907 _mesa_glsl_error(&loc
, state
, "name `%s' already taken in the "
2908 "current scope", decl
->identifier
);
2912 /* Push the variable declaration to the top. It means that all the
2913 * variable declarations will appear in a funny last-to-first order,
2914 * but otherwise we run into trouble if a function is prototyped, a
2915 * global var is decled, then the function is defined with usage of
2916 * the global var. See glslparsertest's CorrectModule.frag.
2918 instructions
->push_head(var
);
2921 instructions
->append_list(&initializer_instructions
);
2925 /* Generally, variable declarations do not have r-values. However,
2926 * one is used for the declaration in
2928 * while (bool b = some_condition()) {
2932 * so we return the rvalue from the last seen declaration here.
2939 ast_parameter_declarator::hir(exec_list
*instructions
,
2940 struct _mesa_glsl_parse_state
*state
)
2943 const struct glsl_type
*type
;
2944 const char *name
= NULL
;
2945 YYLTYPE loc
= this->get_location();
2947 type
= this->type
->specifier
->glsl_type(& name
, state
);
2951 _mesa_glsl_error(& loc
, state
,
2952 "invalid type `%s' in declaration of `%s'",
2953 name
, this->identifier
);
2955 _mesa_glsl_error(& loc
, state
,
2956 "invalid type in declaration of `%s'",
2960 type
= glsl_type::error_type
;
2963 /* From page 62 (page 68 of the PDF) of the GLSL 1.50 spec:
2965 * "Functions that accept no input arguments need not use void in the
2966 * argument list because prototypes (or definitions) are required and
2967 * therefore there is no ambiguity when an empty argument list "( )" is
2968 * declared. The idiom "(void)" as a parameter list is provided for
2971 * Placing this check here prevents a void parameter being set up
2972 * for a function, which avoids tripping up checks for main taking
2973 * parameters and lookups of an unnamed symbol.
2975 if (type
->is_void()) {
2976 if (this->identifier
!= NULL
)
2977 _mesa_glsl_error(& loc
, state
,
2978 "named parameter cannot have type `void'");
2984 if (formal_parameter
&& (this->identifier
== NULL
)) {
2985 _mesa_glsl_error(& loc
, state
, "formal parameter lacks a name");
2989 /* This only handles "vec4 foo[..]". The earlier specifier->glsl_type(...)
2990 * call already handled the "vec4[..] foo" case.
2992 if (this->is_array
) {
2993 type
= process_array_type(&loc
, type
, this->array_size
, state
);
2996 if (!type
->is_error() && type
->array_size() == 0) {
2997 _mesa_glsl_error(&loc
, state
, "arrays passed as parameters must have "
2998 "a declared size.");
2999 type
= glsl_type::error_type
;
3003 ir_variable
*var
= new(ctx
)
3004 ir_variable(type
, this->identifier
, ir_var_function_in
);
3006 /* Apply any specified qualifiers to the parameter declaration. Note that
3007 * for function parameters the default mode is 'in'.
3009 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
, & loc
,
3012 /* From page 17 (page 23 of the PDF) of the GLSL 1.20 spec:
3014 * "Samplers cannot be treated as l-values; hence cannot be used
3015 * as out or inout function parameters, nor can they be assigned
3018 if ((var
->mode
== ir_var_function_inout
|| var
->mode
== ir_var_function_out
)
3019 && type
->contains_sampler()) {
3020 _mesa_glsl_error(&loc
, state
, "out and inout parameters cannot contain samplers");
3021 type
= glsl_type::error_type
;
3024 /* From page 39 (page 45 of the PDF) of the GLSL 1.10 spec:
3026 * "When calling a function, expressions that do not evaluate to
3027 * l-values cannot be passed to parameters declared as out or inout."
3029 * From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
3031 * "Other binary or unary expressions, non-dereferenced arrays,
3032 * function names, swizzles with repeated fields, and constants
3033 * cannot be l-values."
3035 * So for GLSL 1.10, passing an array as an out or inout parameter is not
3036 * allowed. This restriction is removed in GLSL 1.20, and in GLSL ES.
3038 if ((var
->mode
== ir_var_function_inout
|| var
->mode
== ir_var_function_out
)
3040 && !state
->check_version(120, 100, &loc
,
3041 "Arrays cannot be out or inout parameters")) {
3042 type
= glsl_type::error_type
;
3045 instructions
->push_tail(var
);
3047 /* Parameter declarations do not have r-values.
3054 ast_parameter_declarator::parameters_to_hir(exec_list
*ast_parameters
,
3056 exec_list
*ir_parameters
,
3057 _mesa_glsl_parse_state
*state
)
3059 ast_parameter_declarator
*void_param
= NULL
;
3062 foreach_list_typed (ast_parameter_declarator
, param
, link
, ast_parameters
) {
3063 param
->formal_parameter
= formal
;
3064 param
->hir(ir_parameters
, state
);
3072 if ((void_param
!= NULL
) && (count
> 1)) {
3073 YYLTYPE loc
= void_param
->get_location();
3075 _mesa_glsl_error(& loc
, state
,
3076 "`void' parameter must be only parameter");
3082 emit_function(_mesa_glsl_parse_state
*state
, ir_function
*f
)
3084 /* IR invariants disallow function declarations or definitions
3085 * nested within other function definitions. But there is no
3086 * requirement about the relative order of function declarations
3087 * and definitions with respect to one another. So simply insert
3088 * the new ir_function block at the end of the toplevel instruction
3091 state
->toplevel_ir
->push_tail(f
);
3096 ast_function::hir(exec_list
*instructions
,
3097 struct _mesa_glsl_parse_state
*state
)
3100 ir_function
*f
= NULL
;
3101 ir_function_signature
*sig
= NULL
;
3102 exec_list hir_parameters
;
3104 const char *const name
= identifier
;
3106 /* New functions are always added to the top-level IR instruction stream,
3107 * so this instruction list pointer is ignored. See also emit_function
3110 (void) instructions
;
3112 /* From page 21 (page 27 of the PDF) of the GLSL 1.20 spec,
3114 * "Function declarations (prototypes) cannot occur inside of functions;
3115 * they must be at global scope, or for the built-in functions, outside
3116 * the global scope."
3118 * From page 27 (page 33 of the PDF) of the GLSL ES 1.00.16 spec,
3120 * "User defined functions may only be defined within the global scope."
3122 * Note that this language does not appear in GLSL 1.10.
3124 if ((state
->current_function
!= NULL
) &&
3125 state
->is_version(120, 100)) {
3126 YYLTYPE loc
= this->get_location();
3127 _mesa_glsl_error(&loc
, state
,
3128 "declaration of function `%s' not allowed within "
3129 "function body", name
);
3132 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
3134 * "Identifiers starting with "gl_" are reserved for use by
3135 * OpenGL, and may not be declared in a shader as either a
3136 * variable or a function."
3138 if (strncmp(name
, "gl_", 3) == 0) {
3139 YYLTYPE loc
= this->get_location();
3140 _mesa_glsl_error(&loc
, state
,
3141 "identifier `%s' uses reserved `gl_' prefix", name
);
3144 /* Convert the list of function parameters to HIR now so that they can be
3145 * used below to compare this function's signature with previously seen
3146 * signatures for functions with the same name.
3148 ast_parameter_declarator::parameters_to_hir(& this->parameters
,
3150 & hir_parameters
, state
);
3152 const char *return_type_name
;
3153 const glsl_type
*return_type
=
3154 this->return_type
->specifier
->glsl_type(& return_type_name
, state
);
3157 YYLTYPE loc
= this->get_location();
3158 _mesa_glsl_error(&loc
, state
,
3159 "function `%s' has undeclared return type `%s'",
3160 name
, return_type_name
);
3161 return_type
= glsl_type::error_type
;
3164 /* From page 56 (page 62 of the PDF) of the GLSL 1.30 spec:
3165 * "No qualifier is allowed on the return type of a function."
3167 if (this->return_type
->has_qualifiers()) {
3168 YYLTYPE loc
= this->get_location();
3169 _mesa_glsl_error(& loc
, state
,
3170 "function `%s' return type has qualifiers", name
);
3173 /* From page 17 (page 23 of the PDF) of the GLSL 1.20 spec:
3175 * "[Sampler types] can only be declared as function parameters
3176 * or uniform variables (see Section 4.3.5 "Uniform")".
3178 if (return_type
->contains_sampler()) {
3179 YYLTYPE loc
= this->get_location();
3180 _mesa_glsl_error(&loc
, state
,
3181 "function `%s' return type can't contain a sampler",
3185 /* Verify that this function's signature either doesn't match a previously
3186 * seen signature for a function with the same name, or, if a match is found,
3187 * that the previously seen signature does not have an associated definition.
3189 f
= state
->symbols
->get_function(name
);
3190 if (f
!= NULL
&& (state
->es_shader
|| f
->has_user_signature())) {
3191 sig
= f
->exact_matching_signature(&hir_parameters
);
3193 const char *badvar
= sig
->qualifiers_match(&hir_parameters
);
3194 if (badvar
!= NULL
) {
3195 YYLTYPE loc
= this->get_location();
3197 _mesa_glsl_error(&loc
, state
, "function `%s' parameter `%s' "
3198 "qualifiers don't match prototype", name
, badvar
);
3201 if (sig
->return_type
!= return_type
) {
3202 YYLTYPE loc
= this->get_location();
3204 _mesa_glsl_error(&loc
, state
, "function `%s' return type doesn't "
3205 "match prototype", name
);
3208 if (is_definition
&& sig
->is_defined
) {
3209 YYLTYPE loc
= this->get_location();
3211 _mesa_glsl_error(& loc
, state
, "function `%s' redefined", name
);
3215 f
= new(ctx
) ir_function(name
);
3216 if (!state
->symbols
->add_function(f
)) {
3217 /* This function name shadows a non-function use of the same name. */
3218 YYLTYPE loc
= this->get_location();
3220 _mesa_glsl_error(&loc
, state
, "function name `%s' conflicts with "
3221 "non-function", name
);
3225 emit_function(state
, f
);
3228 /* Verify the return type of main() */
3229 if (strcmp(name
, "main") == 0) {
3230 if (! return_type
->is_void()) {
3231 YYLTYPE loc
= this->get_location();
3233 _mesa_glsl_error(& loc
, state
, "main() must return void");
3236 if (!hir_parameters
.is_empty()) {
3237 YYLTYPE loc
= this->get_location();
3239 _mesa_glsl_error(& loc
, state
, "main() must not take any parameters");
3243 /* Finish storing the information about this new function in its signature.
3246 sig
= new(ctx
) ir_function_signature(return_type
);
3247 f
->add_signature(sig
);
3250 sig
->replace_parameters(&hir_parameters
);
3253 /* Function declarations (prototypes) do not have r-values.
3260 ast_function_definition::hir(exec_list
*instructions
,
3261 struct _mesa_glsl_parse_state
*state
)
3263 prototype
->is_definition
= true;
3264 prototype
->hir(instructions
, state
);
3266 ir_function_signature
*signature
= prototype
->signature
;
3267 if (signature
== NULL
)
3270 assert(state
->current_function
== NULL
);
3271 state
->current_function
= signature
;
3272 state
->found_return
= false;
3274 /* Duplicate parameters declared in the prototype as concrete variables.
3275 * Add these to the symbol table.
3277 state
->symbols
->push_scope();
3278 foreach_iter(exec_list_iterator
, iter
, signature
->parameters
) {
3279 ir_variable
*const var
= ((ir_instruction
*) iter
.get())->as_variable();
3281 assert(var
!= NULL
);
3283 /* The only way a parameter would "exist" is if two parameters have
3286 if (state
->symbols
->name_declared_this_scope(var
->name
)) {
3287 YYLTYPE loc
= this->get_location();
3289 _mesa_glsl_error(& loc
, state
, "parameter `%s' redeclared", var
->name
);
3291 state
->symbols
->add_variable(var
);
3295 /* Convert the body of the function to HIR. */
3296 this->body
->hir(&signature
->body
, state
);
3297 signature
->is_defined
= true;
3299 state
->symbols
->pop_scope();
3301 assert(state
->current_function
== signature
);
3302 state
->current_function
= NULL
;
3304 if (!signature
->return_type
->is_void() && !state
->found_return
) {
3305 YYLTYPE loc
= this->get_location();
3306 _mesa_glsl_error(& loc
, state
, "function `%s' has non-void return type "
3307 "%s, but no return statement",
3308 signature
->function_name(),
3309 signature
->return_type
->name
);
3312 /* Function definitions do not have r-values.
3319 ast_jump_statement::hir(exec_list
*instructions
,
3320 struct _mesa_glsl_parse_state
*state
)
3327 assert(state
->current_function
);
3329 if (opt_return_value
) {
3330 ir_rvalue
*const ret
= opt_return_value
->hir(instructions
, state
);
3332 /* The value of the return type can be NULL if the shader says
3333 * 'return foo();' and foo() is a function that returns void.
3335 * NOTE: The GLSL spec doesn't say that this is an error. The type
3336 * of the return value is void. If the return type of the function is
3337 * also void, then this should compile without error. Seriously.
3339 const glsl_type
*const ret_type
=
3340 (ret
== NULL
) ? glsl_type::void_type
: ret
->type
;
3342 /* Implicit conversions are not allowed for return values. */
3343 if (state
->current_function
->return_type
!= ret_type
) {
3344 YYLTYPE loc
= this->get_location();
3346 _mesa_glsl_error(& loc
, state
,
3347 "`return' with wrong type %s, in function `%s' "
3350 state
->current_function
->function_name(),
3351 state
->current_function
->return_type
->name
);
3354 inst
= new(ctx
) ir_return(ret
);
3356 if (state
->current_function
->return_type
->base_type
!=
3358 YYLTYPE loc
= this->get_location();
3360 _mesa_glsl_error(& loc
, state
,
3361 "`return' with no value, in function %s returning "
3363 state
->current_function
->function_name());
3365 inst
= new(ctx
) ir_return
;
3368 state
->found_return
= true;
3369 instructions
->push_tail(inst
);
3374 if (state
->target
!= fragment_shader
) {
3375 YYLTYPE loc
= this->get_location();
3377 _mesa_glsl_error(& loc
, state
,
3378 "`discard' may only appear in a fragment shader");
3380 instructions
->push_tail(new(ctx
) ir_discard
);
3385 if (mode
== ast_continue
&&
3386 state
->loop_nesting_ast
== NULL
) {
3387 YYLTYPE loc
= this->get_location();
3389 _mesa_glsl_error(& loc
, state
,
3390 "continue may only appear in a loop");
3391 } else if (mode
== ast_break
&&
3392 state
->loop_nesting_ast
== NULL
&&
3393 state
->switch_state
.switch_nesting_ast
== NULL
) {
3394 YYLTYPE loc
= this->get_location();
3396 _mesa_glsl_error(& loc
, state
,
3397 "break may only appear in a loop or a switch");
3399 /* For a loop, inline the for loop expression again,
3400 * since we don't know where near the end of
3401 * the loop body the normal copy of it
3402 * is going to be placed.
3404 if (state
->loop_nesting_ast
!= NULL
&&
3405 mode
== ast_continue
&&
3406 state
->loop_nesting_ast
->rest_expression
) {
3407 state
->loop_nesting_ast
->rest_expression
->hir(instructions
,
3411 if (state
->switch_state
.is_switch_innermost
&&
3412 mode
== ast_break
) {
3413 /* Force break out of switch by setting is_break switch state.
3415 ir_variable
*const is_break_var
= state
->switch_state
.is_break_var
;
3416 ir_dereference_variable
*const deref_is_break_var
=
3417 new(ctx
) ir_dereference_variable(is_break_var
);
3418 ir_constant
*const true_val
= new(ctx
) ir_constant(true);
3419 ir_assignment
*const set_break_var
=
3420 new(ctx
) ir_assignment(deref_is_break_var
, true_val
);
3422 instructions
->push_tail(set_break_var
);
3425 ir_loop_jump
*const jump
=
3426 new(ctx
) ir_loop_jump((mode
== ast_break
)
3427 ? ir_loop_jump::jump_break
3428 : ir_loop_jump::jump_continue
);
3429 instructions
->push_tail(jump
);
3436 /* Jump instructions do not have r-values.
3443 ast_selection_statement::hir(exec_list
*instructions
,
3444 struct _mesa_glsl_parse_state
*state
)
3448 ir_rvalue
*const condition
= this->condition
->hir(instructions
, state
);
3450 /* From page 66 (page 72 of the PDF) of the GLSL 1.50 spec:
3452 * "Any expression whose type evaluates to a Boolean can be used as the
3453 * conditional expression bool-expression. Vector types are not accepted
3454 * as the expression to if."
3456 * The checks are separated so that higher quality diagnostics can be
3457 * generated for cases where both rules are violated.
3459 if (!condition
->type
->is_boolean() || !condition
->type
->is_scalar()) {
3460 YYLTYPE loc
= this->condition
->get_location();
3462 _mesa_glsl_error(& loc
, state
, "if-statement condition must be scalar "
3466 ir_if
*const stmt
= new(ctx
) ir_if(condition
);
3468 if (then_statement
!= NULL
) {
3469 state
->symbols
->push_scope();
3470 then_statement
->hir(& stmt
->then_instructions
, state
);
3471 state
->symbols
->pop_scope();
3474 if (else_statement
!= NULL
) {
3475 state
->symbols
->push_scope();
3476 else_statement
->hir(& stmt
->else_instructions
, state
);
3477 state
->symbols
->pop_scope();
3480 instructions
->push_tail(stmt
);
3482 /* if-statements do not have r-values.
3489 ast_switch_statement::hir(exec_list
*instructions
,
3490 struct _mesa_glsl_parse_state
*state
)
3494 ir_rvalue
*const test_expression
=
3495 this->test_expression
->hir(instructions
, state
);
3497 /* From page 66 (page 55 of the PDF) of the GLSL 1.50 spec:
3499 * "The type of init-expression in a switch statement must be a
3502 if (!test_expression
->type
->is_scalar() ||
3503 !test_expression
->type
->is_integer()) {
3504 YYLTYPE loc
= this->test_expression
->get_location();
3506 _mesa_glsl_error(& loc
,
3508 "switch-statement expression must be scalar "
3512 /* Track the switch-statement nesting in a stack-like manner.
3514 struct glsl_switch_state saved
= state
->switch_state
;
3516 state
->switch_state
.is_switch_innermost
= true;
3517 state
->switch_state
.switch_nesting_ast
= this;
3518 state
->switch_state
.labels_ht
= hash_table_ctor(0, hash_table_pointer_hash
,
3519 hash_table_pointer_compare
);
3520 state
->switch_state
.previous_default
= NULL
;
3522 /* Initalize is_fallthru state to false.
3524 ir_rvalue
*const is_fallthru_val
= new (ctx
) ir_constant(false);
3525 state
->switch_state
.is_fallthru_var
=
3526 new(ctx
) ir_variable(glsl_type::bool_type
,
3527 "switch_is_fallthru_tmp",
3529 instructions
->push_tail(state
->switch_state
.is_fallthru_var
);
3531 ir_dereference_variable
*deref_is_fallthru_var
=
3532 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
3533 instructions
->push_tail(new(ctx
) ir_assignment(deref_is_fallthru_var
,
3536 /* Initalize is_break state to false.
3538 ir_rvalue
*const is_break_val
= new (ctx
) ir_constant(false);
3539 state
->switch_state
.is_break_var
= new(ctx
) ir_variable(glsl_type::bool_type
,
3540 "switch_is_break_tmp",
3542 instructions
->push_tail(state
->switch_state
.is_break_var
);
3544 ir_dereference_variable
*deref_is_break_var
=
3545 new(ctx
) ir_dereference_variable(state
->switch_state
.is_break_var
);
3546 instructions
->push_tail(new(ctx
) ir_assignment(deref_is_break_var
,
3549 /* Cache test expression.
3551 test_to_hir(instructions
, state
);
3553 /* Emit code for body of switch stmt.
3555 body
->hir(instructions
, state
);
3557 hash_table_dtor(state
->switch_state
.labels_ht
);
3559 state
->switch_state
= saved
;
3561 /* Switch statements do not have r-values. */
3567 ast_switch_statement::test_to_hir(exec_list
*instructions
,
3568 struct _mesa_glsl_parse_state
*state
)
3572 /* Cache value of test expression. */
3573 ir_rvalue
*const test_val
=
3574 test_expression
->hir(instructions
,
3577 state
->switch_state
.test_var
= new(ctx
) ir_variable(test_val
->type
,
3580 ir_dereference_variable
*deref_test_var
=
3581 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
3583 instructions
->push_tail(state
->switch_state
.test_var
);
3584 instructions
->push_tail(new(ctx
) ir_assignment(deref_test_var
, test_val
));
3589 ast_switch_body::hir(exec_list
*instructions
,
3590 struct _mesa_glsl_parse_state
*state
)
3593 stmts
->hir(instructions
, state
);
3595 /* Switch bodies do not have r-values. */
3600 ast_case_statement_list::hir(exec_list
*instructions
,
3601 struct _mesa_glsl_parse_state
*state
)
3603 foreach_list_typed (ast_case_statement
, case_stmt
, link
, & this->cases
)
3604 case_stmt
->hir(instructions
, state
);
3606 /* Case statements do not have r-values. */
3611 ast_case_statement::hir(exec_list
*instructions
,
3612 struct _mesa_glsl_parse_state
*state
)
3614 labels
->hir(instructions
, state
);
3616 /* Conditionally set fallthru state based on break state. */
3617 ir_constant
*const false_val
= new(state
) ir_constant(false);
3618 ir_dereference_variable
*const deref_is_fallthru_var
=
3619 new(state
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
3620 ir_dereference_variable
*const deref_is_break_var
=
3621 new(state
) ir_dereference_variable(state
->switch_state
.is_break_var
);
3622 ir_assignment
*const reset_fallthru_on_break
=
3623 new(state
) ir_assignment(deref_is_fallthru_var
,
3625 deref_is_break_var
);
3626 instructions
->push_tail(reset_fallthru_on_break
);
3628 /* Guard case statements depending on fallthru state. */
3629 ir_dereference_variable
*const deref_fallthru_guard
=
3630 new(state
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
3631 ir_if
*const test_fallthru
= new(state
) ir_if(deref_fallthru_guard
);
3633 foreach_list_typed (ast_node
, stmt
, link
, & this->stmts
)
3634 stmt
->hir(& test_fallthru
->then_instructions
, state
);
3636 instructions
->push_tail(test_fallthru
);
3638 /* Case statements do not have r-values. */
3644 ast_case_label_list::hir(exec_list
*instructions
,
3645 struct _mesa_glsl_parse_state
*state
)
3647 foreach_list_typed (ast_case_label
, label
, link
, & this->labels
)
3648 label
->hir(instructions
, state
);
3650 /* Case labels do not have r-values. */
3655 ast_case_label::hir(exec_list
*instructions
,
3656 struct _mesa_glsl_parse_state
*state
)
3660 ir_dereference_variable
*deref_fallthru_var
=
3661 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
3663 ir_rvalue
*const true_val
= new(ctx
) ir_constant(true);
3665 /* If not default case, ... */
3666 if (this->test_value
!= NULL
) {
3667 /* Conditionally set fallthru state based on
3668 * comparison of cached test expression value to case label.
3670 ir_rvalue
*const label_rval
= this->test_value
->hir(instructions
, state
);
3671 ir_constant
*label_const
= label_rval
->constant_expression_value();
3674 YYLTYPE loc
= this->test_value
->get_location();
3676 _mesa_glsl_error(& loc
, state
,
3677 "switch statement case label must be a "
3678 "constant expression");
3680 /* Stuff a dummy value in to allow processing to continue. */
3681 label_const
= new(ctx
) ir_constant(0);
3683 ast_expression
*previous_label
= (ast_expression
*)
3684 hash_table_find(state
->switch_state
.labels_ht
,
3685 (void *)(uintptr_t)label_const
->value
.u
[0]);
3687 if (previous_label
) {
3688 YYLTYPE loc
= this->test_value
->get_location();
3689 _mesa_glsl_error(& loc
, state
,
3690 "duplicate case value");
3692 loc
= previous_label
->get_location();
3693 _mesa_glsl_error(& loc
, state
,
3694 "this is the previous case label");
3696 hash_table_insert(state
->switch_state
.labels_ht
,
3698 (void *)(uintptr_t)label_const
->value
.u
[0]);
3702 ir_dereference_variable
*deref_test_var
=
3703 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
3705 ir_rvalue
*const test_cond
= new(ctx
) ir_expression(ir_binop_all_equal
,
3709 ir_assignment
*set_fallthru_on_test
=
3710 new(ctx
) ir_assignment(deref_fallthru_var
,
3714 instructions
->push_tail(set_fallthru_on_test
);
3715 } else { /* default case */
3716 if (state
->switch_state
.previous_default
) {
3717 YYLTYPE loc
= this->get_location();
3718 _mesa_glsl_error(& loc
, state
,
3719 "multiple default labels in one switch");
3721 loc
= state
->switch_state
.previous_default
->get_location();
3722 _mesa_glsl_error(& loc
, state
,
3723 "this is the first default label");
3725 state
->switch_state
.previous_default
= this;
3727 /* Set falltrhu state. */
3728 ir_assignment
*set_fallthru
=
3729 new(ctx
) ir_assignment(deref_fallthru_var
, true_val
);
3731 instructions
->push_tail(set_fallthru
);
3734 /* Case statements do not have r-values. */
3739 ast_iteration_statement::condition_to_hir(ir_loop
*stmt
,
3740 struct _mesa_glsl_parse_state
*state
)
3744 if (condition
!= NULL
) {
3745 ir_rvalue
*const cond
=
3746 condition
->hir(& stmt
->body_instructions
, state
);
3749 || !cond
->type
->is_boolean() || !cond
->type
->is_scalar()) {
3750 YYLTYPE loc
= condition
->get_location();
3752 _mesa_glsl_error(& loc
, state
,
3753 "loop condition must be scalar boolean");
3755 /* As the first code in the loop body, generate a block that looks
3756 * like 'if (!condition) break;' as the loop termination condition.
3758 ir_rvalue
*const not_cond
=
3759 new(ctx
) ir_expression(ir_unop_logic_not
, cond
);
3761 ir_if
*const if_stmt
= new(ctx
) ir_if(not_cond
);
3763 ir_jump
*const break_stmt
=
3764 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
3766 if_stmt
->then_instructions
.push_tail(break_stmt
);
3767 stmt
->body_instructions
.push_tail(if_stmt
);
3774 ast_iteration_statement::hir(exec_list
*instructions
,
3775 struct _mesa_glsl_parse_state
*state
)
3779 /* For-loops and while-loops start a new scope, but do-while loops do not.
3781 if (mode
!= ast_do_while
)
3782 state
->symbols
->push_scope();
3784 if (init_statement
!= NULL
)
3785 init_statement
->hir(instructions
, state
);
3787 ir_loop
*const stmt
= new(ctx
) ir_loop();
3788 instructions
->push_tail(stmt
);
3790 /* Track the current loop nesting. */
3791 ast_iteration_statement
*nesting_ast
= state
->loop_nesting_ast
;
3793 state
->loop_nesting_ast
= this;
3795 /* Likewise, indicate that following code is closest to a loop,
3796 * NOT closest to a switch.
3798 bool saved_is_switch_innermost
= state
->switch_state
.is_switch_innermost
;
3799 state
->switch_state
.is_switch_innermost
= false;
3801 if (mode
!= ast_do_while
)
3802 condition_to_hir(stmt
, state
);
3805 body
->hir(& stmt
->body_instructions
, state
);
3807 if (rest_expression
!= NULL
)
3808 rest_expression
->hir(& stmt
->body_instructions
, state
);
3810 if (mode
== ast_do_while
)
3811 condition_to_hir(stmt
, state
);
3813 if (mode
!= ast_do_while
)
3814 state
->symbols
->pop_scope();
3816 /* Restore previous nesting before returning. */
3817 state
->loop_nesting_ast
= nesting_ast
;
3818 state
->switch_state
.is_switch_innermost
= saved_is_switch_innermost
;
3820 /* Loops do not have r-values.
3827 * Determine if the given type is valid for establishing a default precision
3830 * From GLSL ES 3.00 section 4.5.4 ("Default Precision Qualifiers"):
3832 * "The precision statement
3834 * precision precision-qualifier type;
3836 * can be used to establish a default precision qualifier. The type field
3837 * can be either int or float or any of the sampler types, and the
3838 * precision-qualifier can be lowp, mediump, or highp."
3840 * GLSL ES 1.00 has similar language. GLSL 1.30 doesn't allow precision
3841 * qualifiers on sampler types, but this seems like an oversight (since the
3842 * intention of including these in GLSL 1.30 is to allow compatibility with ES
3843 * shaders). So we allow int, float, and all sampler types regardless of GLSL
3847 is_valid_default_precision_type(const struct _mesa_glsl_parse_state
*state
,
3848 const char *type_name
)
3850 const struct glsl_type
*type
= state
->symbols
->get_type(type_name
);
3854 switch (type
->base_type
) {
3856 case GLSL_TYPE_FLOAT
:
3857 /* "int" and "float" are valid, but vectors and matrices are not. */
3858 return type
->vector_elements
== 1 && type
->matrix_columns
== 1;
3859 case GLSL_TYPE_SAMPLER
:
3868 ast_type_specifier::hir(exec_list
*instructions
,
3869 struct _mesa_glsl_parse_state
*state
)
3871 if (!this->is_precision_statement
&& this->structure
== NULL
)
3874 YYLTYPE loc
= this->get_location();
3876 if (this->precision
!= ast_precision_none
3877 && !state
->check_precision_qualifiers_allowed(&loc
)) {
3880 if (this->precision
!= ast_precision_none
3881 && this->structure
!= NULL
) {
3882 _mesa_glsl_error(&loc
, state
,
3883 "precision qualifiers do not apply to structures");
3887 /* If this is a precision statement, check that the type to which it is
3888 * applied is either float or int.
3890 * From section 4.5.3 of the GLSL 1.30 spec:
3891 * "The precision statement
3892 * precision precision-qualifier type;
3893 * can be used to establish a default precision qualifier. The type
3894 * field can be either int or float [...]. Any other types or
3895 * qualifiers will result in an error.
3897 if (this->is_precision_statement
) {
3898 assert(this->precision
!= ast_precision_none
);
3899 assert(this->structure
== NULL
); /* The check for structures was
3900 * performed above. */
3901 if (this->is_array
) {
3902 _mesa_glsl_error(&loc
, state
,
3903 "default precision statements do not apply to "
3907 if (!is_valid_default_precision_type(state
, this->type_name
)) {
3908 _mesa_glsl_error(&loc
, state
,
3909 "default precision statements apply only to types "
3910 "float, int, and sampler types");
3914 /* FINISHME: Translate precision statements into IR. */
3918 if (this->structure
!= NULL
)
3919 return this->structure
->hir(instructions
, state
);
3926 * Process a structure or interface block tree into an array of structure fields
3928 * After parsing, where there are some syntax differnces, structures and
3929 * interface blocks are almost identical. They are similar enough that the
3930 * AST for each can be processed the same way into a set of
3931 * \c glsl_struct_field to describe the members.
3934 * The number of fields processed. A pointer to the array structure fields is
3935 * stored in \c *fields_ret.
3938 ast_process_structure_or_interface_block(exec_list
*instructions
,
3939 struct _mesa_glsl_parse_state
*state
,
3940 exec_list
*declarations
,
3942 glsl_struct_field
**fields_ret
,
3944 bool block_row_major
)
3946 unsigned decl_count
= 0;
3948 /* Make an initial pass over the list of fields to determine how
3949 * many there are. Each element in this list is an ast_declarator_list.
3950 * This means that we actually need to count the number of elements in the
3951 * 'declarations' list in each of the elements.
3953 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
3954 foreach_list_const (decl_ptr
, & decl_list
->declarations
) {
3959 /* Allocate storage for the fields and process the field
3960 * declarations. As the declarations are processed, try to also convert
3961 * the types to HIR. This ensures that structure definitions embedded in
3962 * other structure definitions or in interface blocks are processed.
3964 glsl_struct_field
*const fields
= ralloc_array(state
, glsl_struct_field
,
3968 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
3969 const char *type_name
;
3971 decl_list
->type
->specifier
->hir(instructions
, state
);
3973 /* Section 10.9 of the GLSL ES 1.00 specification states that
3974 * embedded structure definitions have been removed from the language.
3976 if (state
->es_shader
&& decl_list
->type
->specifier
->structure
!= NULL
) {
3977 _mesa_glsl_error(&loc
, state
, "Embedded structure definitions are "
3978 "not allowed in GLSL ES 1.00.");
3981 const glsl_type
*decl_type
=
3982 decl_list
->type
->specifier
->glsl_type(& type_name
, state
);
3984 foreach_list_typed (ast_declaration
, decl
, link
,
3985 &decl_list
->declarations
) {
3986 /* From the GL_ARB_uniform_buffer_object spec:
3988 * "Sampler types are not allowed inside of uniform
3989 * blocks. All other types, arrays, and structures
3990 * allowed for uniforms are allowed within a uniform
3993 * It should be impossible for decl_type to be NULL here. Cases that
3994 * might naturally lead to decl_type being NULL, especially for the
3995 * is_interface case, will have resulted in compilation having
3996 * already halted due to a syntax error.
3998 const struct glsl_type
*field_type
=
3999 decl_type
!= NULL
? decl_type
: glsl_type::error_type
;
4001 if (is_interface
&& field_type
->contains_sampler()) {
4002 YYLTYPE loc
= decl_list
->get_location();
4003 _mesa_glsl_error(&loc
, state
,
4004 "Uniform in non-default uniform block contains sampler\n");
4007 const struct ast_type_qualifier
*const qual
=
4008 & decl_list
->type
->qualifier
;
4009 if (qual
->flags
.q
.std140
||
4010 qual
->flags
.q
.packed
||
4011 qual
->flags
.q
.shared
) {
4012 _mesa_glsl_error(&loc
, state
,
4013 "uniform block layout qualifiers std140, packed, and "
4014 "shared can only be applied to uniform blocks, not "
4018 if (decl
->is_array
) {
4019 field_type
= process_array_type(&loc
, decl_type
, decl
->array_size
,
4022 fields
[i
].type
= field_type
;
4023 fields
[i
].name
= decl
->identifier
;
4025 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
4026 if (!field_type
->is_matrix() && !field_type
->is_record()) {
4027 _mesa_glsl_error(&loc
, state
,
4028 "uniform block layout qualifiers row_major and "
4029 "column_major can only be applied to matrix and "
4032 validate_matrix_layout_for_type(state
, &loc
, field_type
);
4035 if (field_type
->is_matrix() ||
4036 (field_type
->is_array() && field_type
->fields
.array
->is_matrix())) {
4037 fields
[i
].row_major
= block_row_major
;
4038 if (qual
->flags
.q
.row_major
)
4039 fields
[i
].row_major
= true;
4040 else if (qual
->flags
.q
.column_major
)
4041 fields
[i
].row_major
= false;
4048 assert(i
== decl_count
);
4050 *fields_ret
= fields
;
4056 ast_struct_specifier::hir(exec_list
*instructions
,
4057 struct _mesa_glsl_parse_state
*state
)
4059 YYLTYPE loc
= this->get_location();
4060 glsl_struct_field
*fields
;
4061 unsigned decl_count
=
4062 ast_process_structure_or_interface_block(instructions
,
4064 &this->declarations
,
4070 const glsl_type
*t
=
4071 glsl_type::get_record_instance(fields
, decl_count
, this->name
);
4073 if (!state
->symbols
->add_type(name
, t
)) {
4074 _mesa_glsl_error(& loc
, state
, "struct `%s' previously defined", name
);
4076 const glsl_type
**s
= reralloc(state
, state
->user_structures
,
4078 state
->num_user_structures
+ 1);
4080 s
[state
->num_user_structures
] = t
;
4081 state
->user_structures
= s
;
4082 state
->num_user_structures
++;
4086 /* Structure type definitions do not have r-values.
4092 ast_uniform_block::hir(exec_list
*instructions
,
4093 struct _mesa_glsl_parse_state
*state
)
4095 YYLTYPE loc
= this->get_location();
4097 /* The ast_uniform_block has a list of ast_declarator_lists. We
4098 * need to turn those into ir_variables with an association
4099 * with this uniform block.
4101 enum glsl_interface_packing packing
;
4102 if (this->layout
.flags
.q
.shared
) {
4103 packing
= GLSL_INTERFACE_PACKING_SHARED
;
4104 } else if (this->layout
.flags
.q
.packed
) {
4105 packing
= GLSL_INTERFACE_PACKING_PACKED
;
4107 /* The default layout is std140.
4109 packing
= GLSL_INTERFACE_PACKING_STD140
;
4112 bool block_row_major
= this->layout
.flags
.q
.row_major
;
4113 exec_list declared_variables
;
4114 glsl_struct_field
*fields
;
4115 unsigned int num_variables
=
4116 ast_process_structure_or_interface_block(&declared_variables
,
4118 &this->declarations
,
4124 const glsl_type
*block_type
=
4125 glsl_type::get_interface_instance(fields
,
4130 if (!state
->symbols
->add_type(block_type
->name
, block_type
)) {
4131 YYLTYPE loc
= this->get_location();
4132 _mesa_glsl_error(&loc
, state
, "Uniform block name `%s' already taken in "
4133 "the current scope.\n", this->block_name
);
4136 /* Since interface blocks cannot contain statements, it should be
4137 * impossible for the block to generate any instructions.
4139 assert(declared_variables
.is_empty());
4141 /* Page 39 (page 45 of the PDF) of section 4.3.7 in the GLSL ES 3.00 spec
4144 * "If an instance name (instance-name) is used, then it puts all the
4145 * members inside a scope within its own name space, accessed with the
4146 * field selector ( . ) operator (analogously to structures)."
4148 if (this->instance_name
) {
4151 if (this->array_size
!= NULL
) {
4152 const glsl_type
*block_array_type
=
4153 process_array_type(&loc
, block_type
, this->array_size
, state
);
4155 var
= new(state
) ir_variable(block_array_type
,
4156 this->instance_name
,
4159 var
= new(state
) ir_variable(block_type
,
4160 this->instance_name
,
4164 var
->interface_type
= block_type
;
4165 state
->symbols
->add_variable(var
);
4166 instructions
->push_tail(var
);
4168 /* In order to have an array size, the block must also be declared with
4171 assert(this->array_size
== NULL
);
4173 for (unsigned i
= 0; i
< num_variables
; i
++) {
4175 new(state
) ir_variable(fields
[i
].type
,
4176 ralloc_strdup(state
, fields
[i
].name
),
4178 var
->interface_type
= block_type
;
4180 state
->symbols
->add_variable(var
);
4181 instructions
->push_tail(var
);
4189 detect_conflicting_assignments(struct _mesa_glsl_parse_state
*state
,
4190 exec_list
*instructions
)
4192 bool gl_FragColor_assigned
= false;
4193 bool gl_FragData_assigned
= false;
4194 bool user_defined_fs_output_assigned
= false;
4195 ir_variable
*user_defined_fs_output
= NULL
;
4197 /* It would be nice to have proper location information. */
4199 memset(&loc
, 0, sizeof(loc
));
4201 foreach_list(node
, instructions
) {
4202 ir_variable
*var
= ((ir_instruction
*)node
)->as_variable();
4204 if (!var
|| !var
->assigned
)
4207 if (strcmp(var
->name
, "gl_FragColor") == 0)
4208 gl_FragColor_assigned
= true;
4209 else if (strcmp(var
->name
, "gl_FragData") == 0)
4210 gl_FragData_assigned
= true;
4211 else if (strncmp(var
->name
, "gl_", 3) != 0) {
4212 if (state
->target
== fragment_shader
&&
4213 var
->mode
== ir_var_shader_out
) {
4214 user_defined_fs_output_assigned
= true;
4215 user_defined_fs_output
= var
;
4220 /* From the GLSL 1.30 spec:
4222 * "If a shader statically assigns a value to gl_FragColor, it
4223 * may not assign a value to any element of gl_FragData. If a
4224 * shader statically writes a value to any element of
4225 * gl_FragData, it may not assign a value to
4226 * gl_FragColor. That is, a shader may assign values to either
4227 * gl_FragColor or gl_FragData, but not both. Multiple shaders
4228 * linked together must also consistently write just one of
4229 * these variables. Similarly, if user declared output
4230 * variables are in use (statically assigned to), then the
4231 * built-in variables gl_FragColor and gl_FragData may not be
4232 * assigned to. These incorrect usages all generate compile
4235 if (gl_FragColor_assigned
&& gl_FragData_assigned
) {
4236 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
4237 "`gl_FragColor' and `gl_FragData'\n");
4238 } else if (gl_FragColor_assigned
&& user_defined_fs_output_assigned
) {
4239 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
4240 "`gl_FragColor' and `%s'\n",
4241 user_defined_fs_output
->name
);
4242 } else if (gl_FragData_assigned
&& user_defined_fs_output_assigned
) {
4243 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
4244 "`gl_FragData' and `%s'\n",
4245 user_defined_fs_output
->name
);