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 _mesa_ast_to_hir(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
)
63 _mesa_glsl_initialize_variables(instructions
, state
);
65 state
->symbols
->language_version
= state
->language_version
;
67 state
->current_function
= NULL
;
69 state
->toplevel_ir
= instructions
;
71 /* Section 4.2 of the GLSL 1.20 specification states:
72 * "The built-in functions are scoped in a scope outside the global scope
73 * users declare global variables in. That is, a shader's global scope,
74 * available for user-defined functions and global variables, is nested
75 * inside the scope containing the built-in functions."
77 * Since built-in functions like ftransform() access built-in variables,
78 * it follows that those must be in the outer scope as well.
80 * We push scope here to create this nesting effect...but don't pop.
81 * This way, a shader's globals are still in the symbol table for use
84 state
->symbols
->push_scope();
86 foreach_list_typed (ast_node
, ast
, link
, & state
->translation_unit
)
87 ast
->hir(instructions
, state
);
89 detect_recursion_unlinked(state
, instructions
);
91 state
->toplevel_ir
= NULL
;
96 * If a conversion is available, convert one operand to a different type
98 * The \c from \c ir_rvalue is converted "in place".
100 * \param to Type that the operand it to be converted to
101 * \param from Operand that is being converted
102 * \param state GLSL compiler state
105 * If a conversion is possible (or unnecessary), \c true is returned.
106 * Otherwise \c false is returned.
109 apply_implicit_conversion(const glsl_type
*to
, ir_rvalue
* &from
,
110 struct _mesa_glsl_parse_state
*state
)
113 if (to
->base_type
== from
->type
->base_type
)
116 /* This conversion was added in GLSL 1.20. If the compilation mode is
117 * GLSL 1.10, the conversion is skipped.
119 if (state
->language_version
< 120)
122 /* From page 27 (page 33 of the PDF) of the GLSL 1.50 spec:
124 * "There are no implicit array or structure conversions. For
125 * example, an array of int cannot be implicitly converted to an
126 * array of float. There are no implicit conversions between
127 * signed and unsigned integers."
129 /* FINISHME: The above comment is partially a lie. There is int/uint
130 * FINISHME: conversion for immediate constants.
132 if (!to
->is_float() || !from
->type
->is_numeric())
135 /* Convert to a floating point type with the same number of components
136 * as the original type - i.e. int to float, not int to vec4.
138 to
= glsl_type::get_instance(GLSL_TYPE_FLOAT
, from
->type
->vector_elements
,
139 from
->type
->matrix_columns
);
141 switch (from
->type
->base_type
) {
143 from
= new(ctx
) ir_expression(ir_unop_i2f
, to
, from
, NULL
);
146 from
= new(ctx
) ir_expression(ir_unop_u2f
, to
, from
, NULL
);
149 from
= new(ctx
) ir_expression(ir_unop_b2f
, to
, from
, NULL
);
159 static const struct glsl_type
*
160 arithmetic_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
162 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
164 const glsl_type
*type_a
= value_a
->type
;
165 const glsl_type
*type_b
= value_b
->type
;
167 /* From GLSL 1.50 spec, page 56:
169 * "The arithmetic binary operators add (+), subtract (-),
170 * multiply (*), and divide (/) operate on integer and
171 * floating-point scalars, vectors, and matrices."
173 if (!type_a
->is_numeric() || !type_b
->is_numeric()) {
174 _mesa_glsl_error(loc
, state
,
175 "Operands to arithmetic operators must be numeric");
176 return glsl_type::error_type
;
180 /* "If one operand is floating-point based and the other is
181 * not, then the conversions from Section 4.1.10 "Implicit
182 * Conversions" are applied to the non-floating-point-based operand."
184 if (!apply_implicit_conversion(type_a
, value_b
, state
)
185 && !apply_implicit_conversion(type_b
, value_a
, state
)) {
186 _mesa_glsl_error(loc
, state
,
187 "Could not implicitly convert operands to "
188 "arithmetic operator");
189 return glsl_type::error_type
;
191 type_a
= value_a
->type
;
192 type_b
= value_b
->type
;
194 /* "If the operands are integer types, they must both be signed or
197 * From this rule and the preceeding conversion it can be inferred that
198 * both types must be GLSL_TYPE_FLOAT, or GLSL_TYPE_UINT, or GLSL_TYPE_INT.
199 * The is_numeric check above already filtered out the case where either
200 * type is not one of these, so now the base types need only be tested for
203 if (type_a
->base_type
!= type_b
->base_type
) {
204 _mesa_glsl_error(loc
, state
,
205 "base type mismatch for arithmetic operator");
206 return glsl_type::error_type
;
209 /* "All arithmetic binary operators result in the same fundamental type
210 * (signed integer, unsigned integer, or floating-point) as the
211 * operands they operate on, after operand type conversion. After
212 * conversion, the following cases are valid
214 * * The two operands are scalars. In this case the operation is
215 * applied, resulting in a scalar."
217 if (type_a
->is_scalar() && type_b
->is_scalar())
220 /* "* One operand is a scalar, and the other is a vector or matrix.
221 * In this case, the scalar operation is applied independently to each
222 * component of the vector or matrix, resulting in the same size
225 if (type_a
->is_scalar()) {
226 if (!type_b
->is_scalar())
228 } else if (type_b
->is_scalar()) {
232 /* All of the combinations of <scalar, scalar>, <vector, scalar>,
233 * <scalar, vector>, <scalar, matrix>, and <matrix, scalar> have been
236 assert(!type_a
->is_scalar());
237 assert(!type_b
->is_scalar());
239 /* "* The two operands are vectors of the same size. In this case, the
240 * operation is done component-wise resulting in the same size
243 if (type_a
->is_vector() && type_b
->is_vector()) {
244 if (type_a
== type_b
) {
247 _mesa_glsl_error(loc
, state
,
248 "vector size mismatch for arithmetic operator");
249 return glsl_type::error_type
;
253 /* All of the combinations of <scalar, scalar>, <vector, scalar>,
254 * <scalar, vector>, <scalar, matrix>, <matrix, scalar>, and
255 * <vector, vector> have been handled. At least one of the operands must
256 * be matrix. Further, since there are no integer matrix types, the base
257 * type of both operands must be float.
259 assert(type_a
->is_matrix() || type_b
->is_matrix());
260 assert(type_a
->base_type
== GLSL_TYPE_FLOAT
);
261 assert(type_b
->base_type
== GLSL_TYPE_FLOAT
);
263 /* "* The operator is add (+), subtract (-), or divide (/), and the
264 * operands are matrices with the same number of rows and the same
265 * number of columns. In this case, the operation is done component-
266 * wise resulting in the same size matrix."
267 * * The operator is multiply (*), where both operands are matrices or
268 * one operand is a vector and the other a matrix. A right vector
269 * operand is treated as a column vector and a left vector operand as a
270 * row vector. In all these cases, it is required that the number of
271 * columns of the left operand is equal to the number of rows of the
272 * right operand. Then, the multiply (*) operation does a linear
273 * algebraic multiply, yielding an object that has the same number of
274 * rows as the left operand and the same number of columns as the right
275 * operand. Section 5.10 "Vector and Matrix Operations" explains in
276 * more detail how vectors and matrices are operated on."
279 if (type_a
== type_b
)
282 if (type_a
->is_matrix() && type_b
->is_matrix()) {
283 /* Matrix multiply. The columns of A must match the rows of B. Given
284 * the other previously tested constraints, this means the vector type
285 * of a row from A must be the same as the vector type of a column from
288 if (type_a
->row_type() == type_b
->column_type()) {
289 /* The resulting matrix has the number of columns of matrix B and
290 * the number of rows of matrix A. We get the row count of A by
291 * looking at the size of a vector that makes up a column. The
292 * transpose (size of a row) is done for B.
294 const glsl_type
*const type
=
295 glsl_type::get_instance(type_a
->base_type
,
296 type_a
->column_type()->vector_elements
,
297 type_b
->row_type()->vector_elements
);
298 assert(type
!= glsl_type::error_type
);
302 } else if (type_a
->is_matrix()) {
303 /* A is a matrix and B is a column vector. Columns of A must match
304 * rows of B. Given the other previously tested constraints, this
305 * means the vector type of a row from A must be the same as the
306 * vector the type of B.
308 if (type_a
->row_type() == type_b
) {
309 /* The resulting vector has a number of elements equal to
310 * the number of rows of matrix A. */
311 const glsl_type
*const type
=
312 glsl_type::get_instance(type_a
->base_type
,
313 type_a
->column_type()->vector_elements
,
315 assert(type
!= glsl_type::error_type
);
320 assert(type_b
->is_matrix());
322 /* A is a row vector and B is a matrix. Columns of A must match rows
323 * of B. Given the other previously tested constraints, this means
324 * the type of A must be the same as the vector type of a column from
327 if (type_a
== type_b
->column_type()) {
328 /* The resulting vector has a number of elements equal to
329 * the number of columns of matrix B. */
330 const glsl_type
*const type
=
331 glsl_type::get_instance(type_a
->base_type
,
332 type_b
->row_type()->vector_elements
,
334 assert(type
!= glsl_type::error_type
);
340 _mesa_glsl_error(loc
, state
, "size mismatch for matrix multiplication");
341 return glsl_type::error_type
;
345 /* "All other cases are illegal."
347 _mesa_glsl_error(loc
, state
, "type mismatch");
348 return glsl_type::error_type
;
352 static const struct glsl_type
*
353 unary_arithmetic_result_type(const struct glsl_type
*type
,
354 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
356 /* From GLSL 1.50 spec, page 57:
358 * "The arithmetic unary operators negate (-), post- and pre-increment
359 * and decrement (-- and ++) operate on integer or floating-point
360 * values (including vectors and matrices). All unary operators work
361 * component-wise on their operands. These result with the same type
364 if (!type
->is_numeric()) {
365 _mesa_glsl_error(loc
, state
,
366 "Operands to arithmetic operators must be numeric");
367 return glsl_type::error_type
;
374 * \brief Return the result type of a bit-logic operation.
376 * If the given types to the bit-logic operator are invalid, return
377 * glsl_type::error_type.
379 * \param type_a Type of LHS of bit-logic op
380 * \param type_b Type of RHS of bit-logic op
382 static const struct glsl_type
*
383 bit_logic_result_type(const struct glsl_type
*type_a
,
384 const struct glsl_type
*type_b
,
386 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
388 if (state
->language_version
< 130) {
389 _mesa_glsl_error(loc
, state
, "bit operations require GLSL 1.30");
390 return glsl_type::error_type
;
393 /* From page 50 (page 56 of PDF) of GLSL 1.30 spec:
395 * "The bitwise operators and (&), exclusive-or (^), and inclusive-or
396 * (|). The operands must be of type signed or unsigned integers or
399 if (!type_a
->is_integer()) {
400 _mesa_glsl_error(loc
, state
, "LHS of `%s' must be an integer",
401 ast_expression::operator_string(op
));
402 return glsl_type::error_type
;
404 if (!type_b
->is_integer()) {
405 _mesa_glsl_error(loc
, state
, "RHS of `%s' must be an integer",
406 ast_expression::operator_string(op
));
407 return glsl_type::error_type
;
410 /* "The fundamental types of the operands (signed or unsigned) must
413 if (type_a
->base_type
!= type_b
->base_type
) {
414 _mesa_glsl_error(loc
, state
, "operands of `%s' must have the same "
415 "base type", ast_expression::operator_string(op
));
416 return glsl_type::error_type
;
419 /* "The operands cannot be vectors of differing size." */
420 if (type_a
->is_vector() &&
421 type_b
->is_vector() &&
422 type_a
->vector_elements
!= type_b
->vector_elements
) {
423 _mesa_glsl_error(loc
, state
, "operands of `%s' cannot be vectors of "
424 "different sizes", ast_expression::operator_string(op
));
425 return glsl_type::error_type
;
428 /* "If one operand is a scalar and the other a vector, the scalar is
429 * applied component-wise to the vector, resulting in the same type as
430 * the vector. The fundamental types of the operands [...] will be the
431 * resulting fundamental type."
433 if (type_a
->is_scalar())
439 static const struct glsl_type
*
440 modulus_result_type(const struct glsl_type
*type_a
,
441 const struct glsl_type
*type_b
,
442 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
444 if (state
->language_version
< 130) {
445 _mesa_glsl_error(loc
, state
,
446 "operator '%%' is reserved in %s",
447 state
->version_string
);
448 return glsl_type::error_type
;
451 /* From GLSL 1.50 spec, page 56:
452 * "The operator modulus (%) operates on signed or unsigned integers or
453 * integer vectors. The operand types must both be signed or both be
456 if (!type_a
->is_integer()) {
457 _mesa_glsl_error(loc
, state
, "LHS of operator %% must be an integer.");
458 return glsl_type::error_type
;
460 if (!type_b
->is_integer()) {
461 _mesa_glsl_error(loc
, state
, "RHS of operator %% must be an integer.");
462 return glsl_type::error_type
;
464 if (type_a
->base_type
!= type_b
->base_type
) {
465 _mesa_glsl_error(loc
, state
,
466 "operands of %% must have the same base type");
467 return glsl_type::error_type
;
470 /* "The operands cannot be vectors of differing size. If one operand is
471 * a scalar and the other vector, then the scalar is applied component-
472 * wise to the vector, resulting in the same type as the vector. If both
473 * are vectors of the same size, the result is computed component-wise."
475 if (type_a
->is_vector()) {
476 if (!type_b
->is_vector()
477 || (type_a
->vector_elements
== type_b
->vector_elements
))
482 /* "The operator modulus (%) is not defined for any other data types
483 * (non-integer types)."
485 _mesa_glsl_error(loc
, state
, "type mismatch");
486 return glsl_type::error_type
;
490 static const struct glsl_type
*
491 relational_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
492 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
494 const glsl_type
*type_a
= value_a
->type
;
495 const glsl_type
*type_b
= value_b
->type
;
497 /* From GLSL 1.50 spec, page 56:
498 * "The relational operators greater than (>), less than (<), greater
499 * than or equal (>=), and less than or equal (<=) operate only on
500 * scalar integer and scalar floating-point expressions."
502 if (!type_a
->is_numeric()
503 || !type_b
->is_numeric()
504 || !type_a
->is_scalar()
505 || !type_b
->is_scalar()) {
506 _mesa_glsl_error(loc
, state
,
507 "Operands to relational operators must be scalar and "
509 return glsl_type::error_type
;
512 /* "Either the operands' types must match, or the conversions from
513 * Section 4.1.10 "Implicit Conversions" will be applied to the integer
514 * operand, after which the types must match."
516 if (!apply_implicit_conversion(type_a
, value_b
, state
)
517 && !apply_implicit_conversion(type_b
, value_a
, state
)) {
518 _mesa_glsl_error(loc
, state
,
519 "Could not implicitly convert operands to "
520 "relational operator");
521 return glsl_type::error_type
;
523 type_a
= value_a
->type
;
524 type_b
= value_b
->type
;
526 if (type_a
->base_type
!= type_b
->base_type
) {
527 _mesa_glsl_error(loc
, state
, "base type mismatch");
528 return glsl_type::error_type
;
531 /* "The result is scalar Boolean."
533 return glsl_type::bool_type
;
537 * \brief Return the result type of a bit-shift operation.
539 * If the given types to the bit-shift operator are invalid, return
540 * glsl_type::error_type.
542 * \param type_a Type of LHS of bit-shift op
543 * \param type_b Type of RHS of bit-shift op
545 static const struct glsl_type
*
546 shift_result_type(const struct glsl_type
*type_a
,
547 const struct glsl_type
*type_b
,
549 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
551 if (state
->language_version
< 130) {
552 _mesa_glsl_error(loc
, state
, "bit operations require GLSL 1.30");
553 return glsl_type::error_type
;
556 /* From page 50 (page 56 of the PDF) of the GLSL 1.30 spec:
558 * "The shift operators (<<) and (>>). For both operators, the operands
559 * must be signed or unsigned integers or integer vectors. One operand
560 * can be signed while the other is unsigned."
562 if (!type_a
->is_integer()) {
563 _mesa_glsl_error(loc
, state
, "LHS of operator %s must be an integer or "
564 "integer vector", ast_expression::operator_string(op
));
565 return glsl_type::error_type
;
568 if (!type_b
->is_integer()) {
569 _mesa_glsl_error(loc
, state
, "RHS of operator %s must be an integer or "
570 "integer vector", ast_expression::operator_string(op
));
571 return glsl_type::error_type
;
574 /* "If the first operand is a scalar, the second operand has to be
577 if (type_a
->is_scalar() && !type_b
->is_scalar()) {
578 _mesa_glsl_error(loc
, state
, "If the first operand of %s is scalar, the "
579 "second must be scalar as well",
580 ast_expression::operator_string(op
));
581 return glsl_type::error_type
;
584 /* If both operands are vectors, check that they have same number of
587 if (type_a
->is_vector() &&
588 type_b
->is_vector() &&
589 type_a
->vector_elements
!= type_b
->vector_elements
) {
590 _mesa_glsl_error(loc
, state
, "Vector operands to operator %s must "
591 "have same number of elements",
592 ast_expression::operator_string(op
));
593 return glsl_type::error_type
;
596 /* "In all cases, the resulting type will be the same type as the left
603 * Validates that a value can be assigned to a location with a specified type
605 * Validates that \c rhs can be assigned to some location. If the types are
606 * not an exact match but an automatic conversion is possible, \c rhs will be
610 * \c NULL if \c rhs cannot be assigned to a location with type \c lhs_type.
611 * Otherwise the actual RHS to be assigned will be returned. This may be
612 * \c rhs, or it may be \c rhs after some type conversion.
615 * In addition to being used for assignments, this function is used to
616 * type-check return values.
619 validate_assignment(struct _mesa_glsl_parse_state
*state
,
620 const glsl_type
*lhs_type
, ir_rvalue
*rhs
,
623 /* If there is already some error in the RHS, just return it. Anything
624 * else will lead to an avalanche of error message back to the user.
626 if (rhs
->type
->is_error())
629 /* If the types are identical, the assignment can trivially proceed.
631 if (rhs
->type
== lhs_type
)
634 /* If the array element types are the same and the size of the LHS is zero,
635 * the assignment is okay for initializers embedded in variable
638 * Note: Whole-array assignments are not permitted in GLSL 1.10, but this
639 * is handled by ir_dereference::is_lvalue.
641 if (is_initializer
&& lhs_type
->is_array() && rhs
->type
->is_array()
642 && (lhs_type
->element_type() == rhs
->type
->element_type())
643 && (lhs_type
->array_size() == 0)) {
647 /* Check for implicit conversion in GLSL 1.20 */
648 if (apply_implicit_conversion(lhs_type
, rhs
, state
)) {
649 if (rhs
->type
== lhs_type
)
657 mark_whole_array_access(ir_rvalue
*access
)
659 ir_dereference_variable
*deref
= access
->as_dereference_variable();
661 if (deref
&& deref
->var
) {
662 deref
->var
->max_array_access
= deref
->type
->length
- 1;
667 do_assignment(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
,
668 const char *non_lvalue_description
,
669 ir_rvalue
*lhs
, ir_rvalue
*rhs
, bool is_initializer
,
673 bool error_emitted
= (lhs
->type
->is_error() || rhs
->type
->is_error());
675 if (!error_emitted
) {
676 if (non_lvalue_description
!= NULL
) {
677 _mesa_glsl_error(&lhs_loc
, state
,
679 non_lvalue_description
);
680 error_emitted
= true;
681 } else if (lhs
->variable_referenced() != NULL
682 && lhs
->variable_referenced()->read_only
) {
683 _mesa_glsl_error(&lhs_loc
, state
,
684 "assignment to read-only variable '%s'",
685 lhs
->variable_referenced()->name
);
686 error_emitted
= true;
688 } else if (state
->language_version
<= 110 && lhs
->type
->is_array()) {
689 /* From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
691 * "Other binary or unary expressions, non-dereferenced
692 * arrays, function names, swizzles with repeated fields,
693 * and constants cannot be l-values."
695 _mesa_glsl_error(&lhs_loc
, state
, "whole array assignment is not "
696 "allowed in GLSL 1.10 or GLSL ES 1.00.");
697 error_emitted
= true;
698 } else if (!lhs
->is_lvalue()) {
699 _mesa_glsl_error(& lhs_loc
, state
, "non-lvalue in assignment");
700 error_emitted
= true;
705 validate_assignment(state
, lhs
->type
, rhs
, is_initializer
);
706 if (new_rhs
== NULL
) {
707 _mesa_glsl_error(& lhs_loc
, state
, "type mismatch");
711 /* If the LHS array was not declared with a size, it takes it size from
712 * the RHS. If the LHS is an l-value and a whole array, it must be a
713 * dereference of a variable. Any other case would require that the LHS
714 * is either not an l-value or not a whole array.
716 if (lhs
->type
->array_size() == 0) {
717 ir_dereference
*const d
= lhs
->as_dereference();
721 ir_variable
*const var
= d
->variable_referenced();
725 if (var
->max_array_access
>= unsigned(rhs
->type
->array_size())) {
726 /* FINISHME: This should actually log the location of the RHS. */
727 _mesa_glsl_error(& lhs_loc
, state
, "array size must be > %u due to "
729 var
->max_array_access
);
732 var
->type
= glsl_type::get_array_instance(lhs
->type
->element_type(),
733 rhs
->type
->array_size());
736 mark_whole_array_access(rhs
);
737 mark_whole_array_access(lhs
);
740 /* Most callers of do_assignment (assign, add_assign, pre_inc/dec,
741 * but not post_inc) need the converted assigned value as an rvalue
742 * to handle things like:
746 * So we always just store the computed value being assigned to a
747 * temporary and return a deref of that temporary. If the rvalue
748 * ends up not being used, the temp will get copy-propagated out.
750 ir_variable
*var
= new(ctx
) ir_variable(rhs
->type
, "assignment_tmp",
752 ir_dereference_variable
*deref_var
= new(ctx
) ir_dereference_variable(var
);
753 instructions
->push_tail(var
);
754 instructions
->push_tail(new(ctx
) ir_assignment(deref_var
,
757 deref_var
= new(ctx
) ir_dereference_variable(var
);
760 instructions
->push_tail(new(ctx
) ir_assignment(lhs
, deref_var
, NULL
));
762 return new(ctx
) ir_dereference_variable(var
);
766 get_lvalue_copy(exec_list
*instructions
, ir_rvalue
*lvalue
)
768 void *ctx
= ralloc_parent(lvalue
);
771 var
= new(ctx
) ir_variable(lvalue
->type
, "_post_incdec_tmp",
773 instructions
->push_tail(var
);
774 var
->mode
= ir_var_auto
;
776 instructions
->push_tail(new(ctx
) ir_assignment(new(ctx
) ir_dereference_variable(var
),
779 return new(ctx
) ir_dereference_variable(var
);
784 ast_node::hir(exec_list
*instructions
,
785 struct _mesa_glsl_parse_state
*state
)
794 do_comparison(void *mem_ctx
, int operation
, ir_rvalue
*op0
, ir_rvalue
*op1
)
797 ir_rvalue
*cmp
= NULL
;
799 if (operation
== ir_binop_all_equal
)
800 join_op
= ir_binop_logic_and
;
802 join_op
= ir_binop_logic_or
;
804 switch (op0
->type
->base_type
) {
805 case GLSL_TYPE_FLOAT
:
809 return new(mem_ctx
) ir_expression(operation
, op0
, op1
);
811 case GLSL_TYPE_ARRAY
: {
812 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
813 ir_rvalue
*e0
, *e1
, *result
;
815 e0
= new(mem_ctx
) ir_dereference_array(op0
->clone(mem_ctx
, NULL
),
816 new(mem_ctx
) ir_constant(i
));
817 e1
= new(mem_ctx
) ir_dereference_array(op1
->clone(mem_ctx
, NULL
),
818 new(mem_ctx
) ir_constant(i
));
819 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
822 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
828 mark_whole_array_access(op0
);
829 mark_whole_array_access(op1
);
833 case GLSL_TYPE_STRUCT
: {
834 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
835 ir_rvalue
*e0
, *e1
, *result
;
836 const char *field_name
= op0
->type
->fields
.structure
[i
].name
;
838 e0
= new(mem_ctx
) ir_dereference_record(op0
->clone(mem_ctx
, NULL
),
840 e1
= new(mem_ctx
) ir_dereference_record(op1
->clone(mem_ctx
, NULL
),
842 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
845 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
853 case GLSL_TYPE_ERROR
:
855 case GLSL_TYPE_SAMPLER
:
856 /* I assume a comparison of a struct containing a sampler just
857 * ignores the sampler present in the type.
862 assert(!"Should not get here.");
867 cmp
= new(mem_ctx
) ir_constant(true);
872 /* For logical operations, we want to ensure that the operands are
873 * scalar booleans. If it isn't, emit an error and return a constant
874 * boolean to avoid triggering cascading error messages.
877 get_scalar_boolean_operand(exec_list
*instructions
,
878 struct _mesa_glsl_parse_state
*state
,
879 ast_expression
*parent_expr
,
881 const char *operand_name
,
884 ast_expression
*expr
= parent_expr
->subexpressions
[operand
];
886 ir_rvalue
*val
= expr
->hir(instructions
, state
);
888 if (val
->type
->is_boolean() && val
->type
->is_scalar())
891 if (!*error_emitted
) {
892 YYLTYPE loc
= expr
->get_location();
893 _mesa_glsl_error(&loc
, state
, "%s of `%s' must be scalar boolean",
895 parent_expr
->operator_string(parent_expr
->oper
));
896 *error_emitted
= true;
899 return new(ctx
) ir_constant(true);
903 * If name refers to a builtin array whose maximum allowed size is less than
904 * size, report an error and return true. Otherwise return false.
907 check_builtin_array_max_size(const char *name
, unsigned size
,
908 YYLTYPE loc
, struct _mesa_glsl_parse_state
*state
)
910 if ((strcmp("gl_TexCoord", name
) == 0)
911 && (size
> state
->Const
.MaxTextureCoords
)) {
912 /* From page 54 (page 60 of the PDF) of the GLSL 1.20 spec:
914 * "The size [of gl_TexCoord] can be at most
915 * gl_MaxTextureCoords."
917 _mesa_glsl_error(&loc
, state
, "`gl_TexCoord' array size cannot "
918 "be larger than gl_MaxTextureCoords (%u)\n",
919 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
);
941 * Create the constant 1, of a which is appropriate for incrementing and
942 * decrementing values of the given GLSL type. For example, if type is vec4,
943 * this creates a constant value of 1.0 having type float.
945 * If the given type is invalid for increment and decrement operators, return
946 * a floating point 1--the error will be detected later.
949 constant_one_for_inc_dec(void *ctx
, const glsl_type
*type
)
951 switch (type
->base_type
) {
953 return new(ctx
) ir_constant((unsigned) 1);
955 return new(ctx
) ir_constant(1);
957 case GLSL_TYPE_FLOAT
:
958 return new(ctx
) ir_constant(1.0f
);
963 ast_expression::hir(exec_list
*instructions
,
964 struct _mesa_glsl_parse_state
*state
)
967 static const int operations
[AST_NUM_OPERATORS
] = {
968 -1, /* ast_assign doesn't convert to ir_expression. */
969 -1, /* ast_plus doesn't convert to ir_expression. */
993 /* Note: The following block of expression types actually convert
994 * to multiple IR instructions.
996 ir_binop_mul
, /* ast_mul_assign */
997 ir_binop_div
, /* ast_div_assign */
998 ir_binop_mod
, /* ast_mod_assign */
999 ir_binop_add
, /* ast_add_assign */
1000 ir_binop_sub
, /* ast_sub_assign */
1001 ir_binop_lshift
, /* ast_ls_assign */
1002 ir_binop_rshift
, /* ast_rs_assign */
1003 ir_binop_bit_and
, /* ast_and_assign */
1004 ir_binop_bit_xor
, /* ast_xor_assign */
1005 ir_binop_bit_or
, /* ast_or_assign */
1007 -1, /* ast_conditional doesn't convert to ir_expression. */
1008 ir_binop_add
, /* ast_pre_inc. */
1009 ir_binop_sub
, /* ast_pre_dec. */
1010 ir_binop_add
, /* ast_post_inc. */
1011 ir_binop_sub
, /* ast_post_dec. */
1012 -1, /* ast_field_selection doesn't conv to ir_expression. */
1013 -1, /* ast_array_index doesn't convert to ir_expression. */
1014 -1, /* ast_function_call doesn't conv to ir_expression. */
1015 -1, /* ast_identifier doesn't convert to ir_expression. */
1016 -1, /* ast_int_constant doesn't convert to ir_expression. */
1017 -1, /* ast_uint_constant doesn't conv to ir_expression. */
1018 -1, /* ast_float_constant doesn't conv to ir_expression. */
1019 -1, /* ast_bool_constant doesn't conv to ir_expression. */
1020 -1, /* ast_sequence doesn't convert to ir_expression. */
1022 ir_rvalue
*result
= NULL
;
1024 const struct glsl_type
*type
; /* a temporary variable for switch cases */
1025 bool error_emitted
= false;
1028 loc
= this->get_location();
1030 switch (this->oper
) {
1032 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1033 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1035 result
= do_assignment(instructions
, state
,
1036 this->subexpressions
[0]->non_lvalue_description
,
1037 op
[0], op
[1], false,
1038 this->subexpressions
[0]->get_location());
1039 error_emitted
= result
->type
->is_error();
1044 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1046 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1048 error_emitted
= type
->is_error();
1054 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1056 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1058 error_emitted
= type
->is_error();
1060 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1068 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1069 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1071 type
= arithmetic_result_type(op
[0], op
[1],
1072 (this->oper
== ast_mul
),
1074 error_emitted
= type
->is_error();
1076 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1081 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1082 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1084 type
= modulus_result_type(op
[0]->type
, op
[1]->type
, state
, & loc
);
1086 assert(operations
[this->oper
] == ir_binop_mod
);
1088 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1090 error_emitted
= type
->is_error();
1095 if (state
->language_version
< 130) {
1096 _mesa_glsl_error(&loc
, state
, "operator %s requires GLSL 1.30",
1097 operator_string(this->oper
));
1098 error_emitted
= true;
1101 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1102 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1103 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1105 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1107 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1114 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1115 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1117 type
= relational_result_type(op
[0], op
[1], state
, & loc
);
1119 /* The relational operators must either generate an error or result
1120 * in a scalar boolean. See page 57 of the GLSL 1.50 spec.
1122 assert(type
->is_error()
1123 || ((type
->base_type
== GLSL_TYPE_BOOL
)
1124 && type
->is_scalar()));
1126 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1128 error_emitted
= type
->is_error();
1133 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1134 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1136 /* From page 58 (page 64 of the PDF) of the GLSL 1.50 spec:
1138 * "The equality operators equal (==), and not equal (!=)
1139 * operate on all types. They result in a scalar Boolean. If
1140 * the operand types do not match, then there must be a
1141 * conversion from Section 4.1.10 "Implicit Conversions"
1142 * applied to one operand that can make them match, in which
1143 * case this conversion is done."
1145 if ((!apply_implicit_conversion(op
[0]->type
, op
[1], state
)
1146 && !apply_implicit_conversion(op
[1]->type
, op
[0], state
))
1147 || (op
[0]->type
!= op
[1]->type
)) {
1148 _mesa_glsl_error(& loc
, state
, "operands of `%s' must have the same "
1149 "type", (this->oper
== ast_equal
) ? "==" : "!=");
1150 error_emitted
= true;
1151 } else if ((state
->language_version
<= 110)
1152 && (op
[0]->type
->is_array() || op
[1]->type
->is_array())) {
1153 _mesa_glsl_error(& loc
, state
, "array comparisons forbidden in "
1155 error_emitted
= true;
1158 if (error_emitted
) {
1159 result
= new(ctx
) ir_constant(false);
1161 result
= do_comparison(ctx
, operations
[this->oper
], op
[0], op
[1]);
1162 assert(result
->type
== glsl_type::bool_type
);
1169 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1170 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1171 type
= bit_logic_result_type(op
[0]->type
, op
[1]->type
, this->oper
,
1173 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1175 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1179 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1181 if (state
->language_version
< 130) {
1182 _mesa_glsl_error(&loc
, state
, "bit-wise operations require GLSL 1.30");
1183 error_emitted
= true;
1186 if (!op
[0]->type
->is_integer()) {
1187 _mesa_glsl_error(&loc
, state
, "operand of `~' must be an integer");
1188 error_emitted
= true;
1191 type
= error_emitted
? glsl_type::error_type
: op
[0]->type
;
1192 result
= new(ctx
) ir_expression(ir_unop_bit_not
, type
, op
[0], NULL
);
1195 case ast_logic_and
: {
1196 exec_list rhs_instructions
;
1197 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1198 "LHS", &error_emitted
);
1199 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1200 "RHS", &error_emitted
);
1202 ir_constant
*op0_const
= op
[0]->constant_expression_value();
1204 if (op0_const
->value
.b
[0]) {
1205 instructions
->append_list(&rhs_instructions
);
1210 type
= glsl_type::bool_type
;
1212 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1215 instructions
->push_tail(tmp
);
1217 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1218 instructions
->push_tail(stmt
);
1220 stmt
->then_instructions
.append_list(&rhs_instructions
);
1221 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1222 ir_assignment
*const then_assign
=
1223 new(ctx
) ir_assignment(then_deref
, op
[1], NULL
);
1224 stmt
->then_instructions
.push_tail(then_assign
);
1226 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1227 ir_assignment
*const else_assign
=
1228 new(ctx
) ir_assignment(else_deref
, new(ctx
) ir_constant(false), NULL
);
1229 stmt
->else_instructions
.push_tail(else_assign
);
1231 result
= new(ctx
) ir_dereference_variable(tmp
);
1237 case ast_logic_or
: {
1238 exec_list rhs_instructions
;
1239 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1240 "LHS", &error_emitted
);
1241 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1242 "RHS", &error_emitted
);
1244 ir_constant
*op0_const
= op
[0]->constant_expression_value();
1246 if (op0_const
->value
.b
[0]) {
1251 type
= glsl_type::bool_type
;
1253 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1256 instructions
->push_tail(tmp
);
1258 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1259 instructions
->push_tail(stmt
);
1261 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1262 ir_assignment
*const then_assign
=
1263 new(ctx
) ir_assignment(then_deref
, new(ctx
) ir_constant(true), NULL
);
1264 stmt
->then_instructions
.push_tail(then_assign
);
1266 stmt
->else_instructions
.append_list(&rhs_instructions
);
1267 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1268 ir_assignment
*const else_assign
=
1269 new(ctx
) ir_assignment(else_deref
, op
[1], NULL
);
1270 stmt
->else_instructions
.push_tail(else_assign
);
1272 result
= new(ctx
) ir_dereference_variable(tmp
);
1279 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1281 * "The logical binary operators and (&&), or ( | | ), and
1282 * exclusive or (^^). They operate only on two Boolean
1283 * expressions and result in a Boolean expression."
1285 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0, "LHS",
1287 op
[1] = get_scalar_boolean_operand(instructions
, state
, this, 1, "RHS",
1290 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1295 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1296 "operand", &error_emitted
);
1298 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1302 case ast_mul_assign
:
1303 case ast_div_assign
:
1304 case ast_add_assign
:
1305 case ast_sub_assign
: {
1306 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1307 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1309 type
= arithmetic_result_type(op
[0], op
[1],
1310 (this->oper
== ast_mul_assign
),
1313 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1316 result
= do_assignment(instructions
, state
,
1317 this->subexpressions
[0]->non_lvalue_description
,
1318 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1319 this->subexpressions
[0]->get_location());
1320 error_emitted
= (op
[0]->type
->is_error());
1322 /* GLSL 1.10 does not allow array assignment. However, we don't have to
1323 * explicitly test for this because none of the binary expression
1324 * operators allow array operands either.
1330 case ast_mod_assign
: {
1331 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1332 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1334 type
= modulus_result_type(op
[0]->type
, op
[1]->type
, state
, & loc
);
1336 assert(operations
[this->oper
] == ir_binop_mod
);
1338 ir_rvalue
*temp_rhs
;
1339 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1342 result
= do_assignment(instructions
, state
,
1343 this->subexpressions
[0]->non_lvalue_description
,
1344 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1345 this->subexpressions
[0]->get_location());
1346 error_emitted
= type
->is_error();
1351 case ast_rs_assign
: {
1352 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1353 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1354 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
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_and_assign
:
1367 case ast_xor_assign
:
1368 case ast_or_assign
: {
1369 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1370 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1371 type
= bit_logic_result_type(op
[0]->type
, op
[1]->type
, this->oper
,
1373 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1374 type
, op
[0], op
[1]);
1375 result
= do_assignment(instructions
, state
,
1376 this->subexpressions
[0]->non_lvalue_description
,
1377 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1378 this->subexpressions
[0]->get_location());
1379 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1383 case ast_conditional
: {
1384 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1386 * "The ternary selection operator (?:). It operates on three
1387 * expressions (exp1 ? exp2 : exp3). This operator evaluates the
1388 * first expression, which must result in a scalar Boolean."
1390 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1391 "condition", &error_emitted
);
1393 /* The :? operator is implemented by generating an anonymous temporary
1394 * followed by an if-statement. The last instruction in each branch of
1395 * the if-statement assigns a value to the anonymous temporary. This
1396 * temporary is the r-value of the expression.
1398 exec_list then_instructions
;
1399 exec_list else_instructions
;
1401 op
[1] = this->subexpressions
[1]->hir(&then_instructions
, state
);
1402 op
[2] = this->subexpressions
[2]->hir(&else_instructions
, state
);
1404 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1406 * "The second and third expressions can be any type, as
1407 * long their types match, or there is a conversion in
1408 * Section 4.1.10 "Implicit Conversions" that can be applied
1409 * to one of the expressions to make their types match. This
1410 * resulting matching type is the type of the entire
1413 if ((!apply_implicit_conversion(op
[1]->type
, op
[2], state
)
1414 && !apply_implicit_conversion(op
[2]->type
, op
[1], state
))
1415 || (op
[1]->type
!= op
[2]->type
)) {
1416 YYLTYPE loc
= this->subexpressions
[1]->get_location();
1418 _mesa_glsl_error(& loc
, state
, "Second and third operands of ?: "
1419 "operator must have matching types.");
1420 error_emitted
= true;
1421 type
= glsl_type::error_type
;
1426 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1428 * "The second and third expressions must be the same type, but can
1429 * be of any type other than an array."
1431 if ((state
->language_version
<= 110) && type
->is_array()) {
1432 _mesa_glsl_error(& loc
, state
, "Second and third operands of ?: "
1433 "operator must not be arrays.");
1434 error_emitted
= true;
1437 ir_constant
*cond_val
= op
[0]->constant_expression_value();
1438 ir_constant
*then_val
= op
[1]->constant_expression_value();
1439 ir_constant
*else_val
= op
[2]->constant_expression_value();
1441 if (then_instructions
.is_empty()
1442 && else_instructions
.is_empty()
1443 && (cond_val
!= NULL
) && (then_val
!= NULL
) && (else_val
!= NULL
)) {
1444 result
= (cond_val
->value
.b
[0]) ? then_val
: else_val
;
1446 ir_variable
*const tmp
=
1447 new(ctx
) ir_variable(type
, "conditional_tmp", ir_var_temporary
);
1448 instructions
->push_tail(tmp
);
1450 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1451 instructions
->push_tail(stmt
);
1453 then_instructions
.move_nodes_to(& stmt
->then_instructions
);
1454 ir_dereference
*const then_deref
=
1455 new(ctx
) ir_dereference_variable(tmp
);
1456 ir_assignment
*const then_assign
=
1457 new(ctx
) ir_assignment(then_deref
, op
[1], NULL
);
1458 stmt
->then_instructions
.push_tail(then_assign
);
1460 else_instructions
.move_nodes_to(& stmt
->else_instructions
);
1461 ir_dereference
*const else_deref
=
1462 new(ctx
) ir_dereference_variable(tmp
);
1463 ir_assignment
*const else_assign
=
1464 new(ctx
) ir_assignment(else_deref
, op
[2], NULL
);
1465 stmt
->else_instructions
.push_tail(else_assign
);
1467 result
= new(ctx
) ir_dereference_variable(tmp
);
1474 this->non_lvalue_description
= (this->oper
== ast_pre_inc
)
1475 ? "pre-increment operation" : "pre-decrement operation";
1477 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1478 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1480 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1482 ir_rvalue
*temp_rhs
;
1483 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1486 result
= do_assignment(instructions
, state
,
1487 this->subexpressions
[0]->non_lvalue_description
,
1488 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1489 this->subexpressions
[0]->get_location());
1490 error_emitted
= op
[0]->type
->is_error();
1495 case ast_post_dec
: {
1496 this->non_lvalue_description
= (this->oper
== ast_post_inc
)
1497 ? "post-increment operation" : "post-decrement operation";
1498 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1499 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1501 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1503 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1505 ir_rvalue
*temp_rhs
;
1506 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1509 /* Get a temporary of a copy of the lvalue before it's modified.
1510 * This may get thrown away later.
1512 result
= get_lvalue_copy(instructions
, op
[0]->clone(ctx
, NULL
));
1514 (void)do_assignment(instructions
, state
,
1515 this->subexpressions
[0]->non_lvalue_description
,
1516 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1517 this->subexpressions
[0]->get_location());
1519 error_emitted
= op
[0]->type
->is_error();
1523 case ast_field_selection
:
1524 result
= _mesa_ast_field_selection_to_hir(this, instructions
, state
);
1527 case ast_array_index
: {
1528 YYLTYPE index_loc
= subexpressions
[1]->get_location();
1530 op
[0] = subexpressions
[0]->hir(instructions
, state
);
1531 op
[1] = subexpressions
[1]->hir(instructions
, state
);
1533 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1535 ir_rvalue
*const array
= op
[0];
1537 result
= new(ctx
) ir_dereference_array(op
[0], op
[1]);
1539 /* Do not use op[0] after this point. Use array.
1547 if (!array
->type
->is_array()
1548 && !array
->type
->is_matrix()
1549 && !array
->type
->is_vector()) {
1550 _mesa_glsl_error(& index_loc
, state
,
1551 "cannot dereference non-array / non-matrix / "
1553 error_emitted
= true;
1556 if (!op
[1]->type
->is_integer()) {
1557 _mesa_glsl_error(& index_loc
, state
,
1558 "array index must be integer type");
1559 error_emitted
= true;
1560 } else if (!op
[1]->type
->is_scalar()) {
1561 _mesa_glsl_error(& index_loc
, state
,
1562 "array index must be scalar");
1563 error_emitted
= true;
1566 /* If the array index is a constant expression and the array has a
1567 * declared size, ensure that the access is in-bounds. If the array
1568 * index is not a constant expression, ensure that the array has a
1571 ir_constant
*const const_index
= op
[1]->constant_expression_value();
1572 if (const_index
!= NULL
) {
1573 const int idx
= const_index
->value
.i
[0];
1574 const char *type_name
;
1577 if (array
->type
->is_matrix()) {
1578 type_name
= "matrix";
1579 } else if (array
->type
->is_vector()) {
1580 type_name
= "vector";
1582 type_name
= "array";
1585 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec:
1587 * "It is illegal to declare an array with a size, and then
1588 * later (in the same shader) index the same array with an
1589 * integral constant expression greater than or equal to the
1590 * declared size. It is also illegal to index an array with a
1591 * negative constant expression."
1593 if (array
->type
->is_matrix()) {
1594 if (array
->type
->row_type()->vector_elements
<= idx
) {
1595 bound
= array
->type
->row_type()->vector_elements
;
1597 } else if (array
->type
->is_vector()) {
1598 if (array
->type
->vector_elements
<= idx
) {
1599 bound
= array
->type
->vector_elements
;
1602 if ((array
->type
->array_size() > 0)
1603 && (array
->type
->array_size() <= idx
)) {
1604 bound
= array
->type
->array_size();
1609 _mesa_glsl_error(& loc
, state
, "%s index must be < %u",
1611 error_emitted
= true;
1612 } else if (idx
< 0) {
1613 _mesa_glsl_error(& loc
, state
, "%s index must be >= 0",
1615 error_emitted
= true;
1618 if (array
->type
->is_array()) {
1619 /* If the array is a variable dereference, it dereferences the
1620 * whole array, by definition. Use this to get the variable.
1622 * FINISHME: Should some methods for getting / setting / testing
1623 * FINISHME: array access limits be added to ir_dereference?
1625 ir_variable
*const v
= array
->whole_variable_referenced();
1626 if ((v
!= NULL
) && (unsigned(idx
) > v
->max_array_access
)) {
1627 v
->max_array_access
= idx
;
1629 /* Check whether this access will, as a side effect, implicitly
1630 * cause the size of a built-in array to be too large.
1632 if (check_builtin_array_max_size(v
->name
, idx
+1, loc
, state
))
1633 error_emitted
= true;
1636 } else if (array
->type
->array_size() == 0) {
1637 _mesa_glsl_error(&loc
, state
, "unsized array index must be constant");
1639 if (array
->type
->is_array()) {
1640 /* whole_variable_referenced can return NULL if the array is a
1641 * member of a structure. In this case it is safe to not update
1642 * the max_array_access field because it is never used for fields
1645 ir_variable
*v
= array
->whole_variable_referenced();
1647 v
->max_array_access
= array
->type
->array_size() - 1;
1651 /* From page 23 (29 of the PDF) of the GLSL 1.30 spec:
1653 * "Samplers aggregated into arrays within a shader (using square
1654 * brackets [ ]) can only be indexed with integral constant
1655 * expressions [...]."
1657 * This restriction was added in GLSL 1.30. Shaders using earlier version
1658 * of the language should not be rejected by the compiler front-end for
1659 * using this construct. This allows useful things such as using a loop
1660 * counter as the index to an array of samplers. If the loop in unrolled,
1661 * the code should compile correctly. Instead, emit a warning.
1663 if (array
->type
->is_array() &&
1664 array
->type
->element_type()->is_sampler() &&
1665 const_index
== NULL
) {
1667 if (state
->language_version
== 100) {
1668 _mesa_glsl_warning(&loc
, state
,
1669 "sampler arrays indexed with non-constant "
1670 "expressions is optional in GLSL ES 1.00");
1671 } else if (state
->language_version
< 130) {
1672 _mesa_glsl_warning(&loc
, state
,
1673 "sampler arrays indexed with non-constant "
1674 "expressions is forbidden in GLSL 1.30 and "
1677 _mesa_glsl_error(&loc
, state
,
1678 "sampler arrays indexed with non-constant "
1679 "expressions is forbidden in GLSL 1.30 and "
1681 error_emitted
= true;
1686 result
->type
= glsl_type::error_type
;
1691 case ast_function_call
:
1692 /* Should *NEVER* get here. ast_function_call should always be handled
1693 * by ast_function_expression::hir.
1698 case ast_identifier
: {
1699 /* ast_identifier can appear several places in a full abstract syntax
1700 * tree. This particular use must be at location specified in the grammar
1701 * as 'variable_identifier'.
1704 state
->symbols
->get_variable(this->primary_expression
.identifier
);
1706 result
= new(ctx
) ir_dereference_variable(var
);
1711 _mesa_glsl_error(& loc
, state
, "`%s' undeclared",
1712 this->primary_expression
.identifier
);
1714 error_emitted
= true;
1719 case ast_int_constant
:
1720 result
= new(ctx
) ir_constant(this->primary_expression
.int_constant
);
1723 case ast_uint_constant
:
1724 result
= new(ctx
) ir_constant(this->primary_expression
.uint_constant
);
1727 case ast_float_constant
:
1728 result
= new(ctx
) ir_constant(this->primary_expression
.float_constant
);
1731 case ast_bool_constant
:
1732 result
= new(ctx
) ir_constant(bool(this->primary_expression
.bool_constant
));
1735 case ast_sequence
: {
1736 /* It should not be possible to generate a sequence in the AST without
1737 * any expressions in it.
1739 assert(!this->expressions
.is_empty());
1741 /* The r-value of a sequence is the last expression in the sequence. If
1742 * the other expressions in the sequence do not have side-effects (and
1743 * therefore add instructions to the instruction list), they get dropped
1746 exec_node
*previous_tail_pred
= NULL
;
1747 YYLTYPE previous_operand_loc
= loc
;
1749 foreach_list_typed (ast_node
, ast
, link
, &this->expressions
) {
1750 /* If one of the operands of comma operator does not generate any
1751 * code, we want to emit a warning. At each pass through the loop
1752 * previous_tail_pred will point to the last instruction in the
1753 * stream *before* processing the previous operand. Naturally,
1754 * instructions->tail_pred will point to the last instruction in the
1755 * stream *after* processing the previous operand. If the two
1756 * pointers match, then the previous operand had no effect.
1758 * The warning behavior here differs slightly from GCC. GCC will
1759 * only emit a warning if none of the left-hand operands have an
1760 * effect. However, it will emit a warning for each. I believe that
1761 * there are some cases in C (especially with GCC extensions) where
1762 * it is useful to have an intermediate step in a sequence have no
1763 * effect, but I don't think these cases exist in GLSL. Either way,
1764 * it would be a giant hassle to replicate that behavior.
1766 if (previous_tail_pred
== instructions
->tail_pred
) {
1767 _mesa_glsl_warning(&previous_operand_loc
, state
,
1768 "left-hand operand of comma expression has "
1772 /* tail_pred is directly accessed instead of using the get_tail()
1773 * method for performance reasons. get_tail() has extra code to
1774 * return NULL when the list is empty. We don't care about that
1775 * here, so using tail_pred directly is fine.
1777 previous_tail_pred
= instructions
->tail_pred
;
1778 previous_operand_loc
= ast
->get_location();
1780 result
= ast
->hir(instructions
, state
);
1783 /* Any errors should have already been emitted in the loop above.
1785 error_emitted
= true;
1789 type
= NULL
; /* use result->type, not type. */
1790 assert(result
!= NULL
);
1792 if (result
->type
->is_error() && !error_emitted
)
1793 _mesa_glsl_error(& loc
, state
, "type mismatch");
1800 ast_expression_statement::hir(exec_list
*instructions
,
1801 struct _mesa_glsl_parse_state
*state
)
1803 /* It is possible to have expression statements that don't have an
1804 * expression. This is the solitary semicolon:
1806 * for (i = 0; i < 5; i++)
1809 * In this case the expression will be NULL. Test for NULL and don't do
1810 * anything in that case.
1812 if (expression
!= NULL
)
1813 expression
->hir(instructions
, state
);
1815 /* Statements do not have r-values.
1822 ast_compound_statement::hir(exec_list
*instructions
,
1823 struct _mesa_glsl_parse_state
*state
)
1826 state
->symbols
->push_scope();
1828 foreach_list_typed (ast_node
, ast
, link
, &this->statements
)
1829 ast
->hir(instructions
, state
);
1832 state
->symbols
->pop_scope();
1834 /* Compound statements do not have r-values.
1840 static const glsl_type
*
1841 process_array_type(YYLTYPE
*loc
, const glsl_type
*base
, ast_node
*array_size
,
1842 struct _mesa_glsl_parse_state
*state
)
1844 unsigned length
= 0;
1846 /* From page 19 (page 25) of the GLSL 1.20 spec:
1848 * "Only one-dimensional arrays may be declared."
1850 if (base
->is_array()) {
1851 _mesa_glsl_error(loc
, state
,
1852 "invalid array of `%s' (only one-dimensional arrays "
1855 return glsl_type::error_type
;
1858 if (array_size
!= NULL
) {
1859 exec_list dummy_instructions
;
1860 ir_rvalue
*const ir
= array_size
->hir(& dummy_instructions
, state
);
1861 YYLTYPE loc
= array_size
->get_location();
1864 if (!ir
->type
->is_integer()) {
1865 _mesa_glsl_error(& loc
, state
, "array size must be integer type");
1866 } else if (!ir
->type
->is_scalar()) {
1867 _mesa_glsl_error(& loc
, state
, "array size must be scalar type");
1869 ir_constant
*const size
= ir
->constant_expression_value();
1872 _mesa_glsl_error(& loc
, state
, "array size must be a "
1873 "constant valued expression");
1874 } else if (size
->value
.i
[0] <= 0) {
1875 _mesa_glsl_error(& loc
, state
, "array size must be > 0");
1877 assert(size
->type
== ir
->type
);
1878 length
= size
->value
.u
[0];
1880 /* If the array size is const (and we've verified that
1881 * it is) then no instructions should have been emitted
1882 * when we converted it to HIR. If they were emitted,
1883 * then either the array size isn't const after all, or
1884 * we are emitting unnecessary instructions.
1886 assert(dummy_instructions
.is_empty());
1890 } else if (state
->es_shader
) {
1891 /* Section 10.17 of the GLSL ES 1.00 specification states that unsized
1892 * array declarations have been removed from the language.
1894 _mesa_glsl_error(loc
, state
, "unsized array declarations are not "
1895 "allowed in GLSL ES 1.00.");
1898 return glsl_type::get_array_instance(base
, length
);
1903 ast_type_specifier::glsl_type(const char **name
,
1904 struct _mesa_glsl_parse_state
*state
) const
1906 const struct glsl_type
*type
;
1908 type
= state
->symbols
->get_type(this->type_name
);
1909 *name
= this->type_name
;
1911 if (this->is_array
) {
1912 YYLTYPE loc
= this->get_location();
1913 type
= process_array_type(&loc
, type
, this->array_size
, state
);
1921 apply_type_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
1923 struct _mesa_glsl_parse_state
*state
,
1926 if (qual
->flags
.q
.invariant
) {
1928 _mesa_glsl_error(loc
, state
,
1929 "variable `%s' may not be redeclared "
1930 "`invariant' after being used",
1937 if (qual
->flags
.q
.constant
|| qual
->flags
.q
.attribute
1938 || qual
->flags
.q
.uniform
1939 || (qual
->flags
.q
.varying
&& (state
->target
== fragment_shader
)))
1942 if (qual
->flags
.q
.centroid
)
1945 if (qual
->flags
.q
.attribute
&& state
->target
!= vertex_shader
) {
1946 var
->type
= glsl_type::error_type
;
1947 _mesa_glsl_error(loc
, state
,
1948 "`attribute' variables may not be declared in the "
1950 _mesa_glsl_shader_target_name(state
->target
));
1953 /* From page 25 (page 31 of the PDF) of the GLSL 1.10 spec:
1955 * "The varying qualifier can be used only with the data types
1956 * float, vec2, vec3, vec4, mat2, mat3, and mat4, or arrays of
1959 if (qual
->flags
.q
.varying
) {
1960 const glsl_type
*non_array_type
;
1962 if (var
->type
&& var
->type
->is_array())
1963 non_array_type
= var
->type
->fields
.array
;
1965 non_array_type
= var
->type
;
1967 if (non_array_type
&& non_array_type
->base_type
!= GLSL_TYPE_FLOAT
) {
1968 var
->type
= glsl_type::error_type
;
1969 _mesa_glsl_error(loc
, state
,
1970 "varying variables must be of base type float");
1974 /* If there is no qualifier that changes the mode of the variable, leave
1975 * the setting alone.
1977 if (qual
->flags
.q
.in
&& qual
->flags
.q
.out
)
1978 var
->mode
= ir_var_inout
;
1979 else if (qual
->flags
.q
.attribute
|| qual
->flags
.q
.in
1980 || (qual
->flags
.q
.varying
&& (state
->target
== fragment_shader
)))
1981 var
->mode
= ir_var_in
;
1982 else if (qual
->flags
.q
.out
1983 || (qual
->flags
.q
.varying
&& (state
->target
== vertex_shader
)))
1984 var
->mode
= ir_var_out
;
1985 else if (qual
->flags
.q
.uniform
)
1986 var
->mode
= ir_var_uniform
;
1988 if (state
->all_invariant
&& (state
->current_function
== NULL
)) {
1989 switch (state
->target
) {
1991 if (var
->mode
== ir_var_out
)
1992 var
->invariant
= true;
1994 case geometry_shader
:
1995 if ((var
->mode
== ir_var_in
) || (var
->mode
== ir_var_out
))
1996 var
->invariant
= true;
1998 case fragment_shader
:
1999 if (var
->mode
== ir_var_in
)
2000 var
->invariant
= true;
2005 if (qual
->flags
.q
.flat
)
2006 var
->interpolation
= INTERP_QUALIFIER_FLAT
;
2007 else if (qual
->flags
.q
.noperspective
)
2008 var
->interpolation
= INTERP_QUALIFIER_NOPERSPECTIVE
;
2009 else if (qual
->flags
.q
.smooth
)
2010 var
->interpolation
= INTERP_QUALIFIER_SMOOTH
;
2012 var
->interpolation
= INTERP_QUALIFIER_NONE
;
2014 if (var
->interpolation
!= INTERP_QUALIFIER_NONE
&&
2015 !(state
->target
== vertex_shader
&& var
->mode
== ir_var_out
) &&
2016 !(state
->target
== fragment_shader
&& var
->mode
== ir_var_in
)) {
2017 const char *qual_string
= NULL
;
2018 switch (var
->interpolation
) {
2019 case INTERP_QUALIFIER_FLAT
:
2020 qual_string
= "flat";
2022 case INTERP_QUALIFIER_NOPERSPECTIVE
:
2023 qual_string
= "noperspective";
2025 case INTERP_QUALIFIER_SMOOTH
:
2026 qual_string
= "smooth";
2030 _mesa_glsl_error(loc
, state
,
2031 "interpolation qualifier `%s' can only be applied to "
2032 "vertex shader outputs and fragment shader inputs.",
2037 var
->pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
2038 var
->origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
2039 if ((qual
->flags
.q
.origin_upper_left
|| qual
->flags
.q
.pixel_center_integer
)
2040 && (strcmp(var
->name
, "gl_FragCoord") != 0)) {
2041 const char *const qual_string
= (qual
->flags
.q
.origin_upper_left
)
2042 ? "origin_upper_left" : "pixel_center_integer";
2044 _mesa_glsl_error(loc
, state
,
2045 "layout qualifier `%s' can only be applied to "
2046 "fragment shader input `gl_FragCoord'",
2050 if (qual
->flags
.q
.explicit_location
) {
2051 const bool global_scope
= (state
->current_function
== NULL
);
2053 const char *string
= "";
2055 /* In the vertex shader only shader inputs can be given explicit
2058 * In the fragment shader only shader outputs can be given explicit
2061 switch (state
->target
) {
2063 if (!global_scope
|| (var
->mode
!= ir_var_in
)) {
2069 case geometry_shader
:
2070 _mesa_glsl_error(loc
, state
,
2071 "geometry shader variables cannot be given "
2072 "explicit locations\n");
2075 case fragment_shader
:
2076 if (!global_scope
|| (var
->mode
!= ir_var_out
)) {
2084 _mesa_glsl_error(loc
, state
,
2085 "only %s shader %s variables can be given an "
2086 "explicit location\n",
2087 _mesa_glsl_shader_target_name(state
->target
),
2090 var
->explicit_location
= true;
2092 /* This bit of silliness is needed because invalid explicit locations
2093 * are supposed to be flagged during linking. Small negative values
2094 * biased by VERT_ATTRIB_GENERIC0 or FRAG_RESULT_DATA0 could alias
2095 * built-in values (e.g., -16+VERT_ATTRIB_GENERIC0 = VERT_ATTRIB_POS).
2096 * The linker needs to be able to differentiate these cases. This
2097 * ensures that negative values stay negative.
2099 if (qual
->location
>= 0) {
2100 var
->location
= (state
->target
== vertex_shader
)
2101 ? (qual
->location
+ VERT_ATTRIB_GENERIC0
)
2102 : (qual
->location
+ FRAG_RESULT_DATA0
);
2104 var
->location
= qual
->location
;
2109 /* Does the declaration use the 'layout' keyword?
2111 const bool uses_layout
= qual
->flags
.q
.pixel_center_integer
2112 || qual
->flags
.q
.origin_upper_left
2113 || qual
->flags
.q
.explicit_location
;
2115 /* Does the declaration use the deprecated 'attribute' or 'varying'
2118 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
2119 || qual
->flags
.q
.varying
;
2121 /* Is the 'layout' keyword used with parameters that allow relaxed checking.
2122 * Many implementations of GL_ARB_fragment_coord_conventions_enable and some
2123 * implementations (only Mesa?) GL_ARB_explicit_attrib_location_enable
2124 * allowed the layout qualifier to be used with 'varying' and 'attribute'.
2125 * These extensions and all following extensions that add the 'layout'
2126 * keyword have been modified to require the use of 'in' or 'out'.
2128 * The following extension do not allow the deprecated keywords:
2130 * GL_AMD_conservative_depth
2131 * GL_ARB_conservative_depth
2132 * GL_ARB_gpu_shader5
2133 * GL_ARB_separate_shader_objects
2134 * GL_ARB_tesselation_shader
2135 * GL_ARB_transform_feedback3
2136 * GL_ARB_uniform_buffer_object
2138 * It is unknown whether GL_EXT_shader_image_load_store or GL_NV_gpu_shader5
2139 * allow layout with the deprecated keywords.
2141 const bool relaxed_layout_qualifier_checking
=
2142 state
->ARB_fragment_coord_conventions_enable
;
2144 if (uses_layout
&& uses_deprecated_qualifier
) {
2145 if (relaxed_layout_qualifier_checking
) {
2146 _mesa_glsl_warning(loc
, state
,
2147 "`layout' qualifier may not be used with "
2148 "`attribute' or `varying'");
2150 _mesa_glsl_error(loc
, state
,
2151 "`layout' qualifier may not be used with "
2152 "`attribute' or `varying'");
2156 /* Layout qualifiers for gl_FragDepth, which are enabled by extension
2157 * AMD_conservative_depth.
2159 int depth_layout_count
= qual
->flags
.q
.depth_any
2160 + qual
->flags
.q
.depth_greater
2161 + qual
->flags
.q
.depth_less
2162 + qual
->flags
.q
.depth_unchanged
;
2163 if (depth_layout_count
> 0
2164 && !state
->AMD_conservative_depth_enable
2165 && !state
->ARB_conservative_depth_enable
) {
2166 _mesa_glsl_error(loc
, state
,
2167 "extension GL_AMD_conservative_depth or "
2168 "GL_ARB_conservative_depth must be enabled "
2169 "to use depth layout qualifiers");
2170 } else if (depth_layout_count
> 0
2171 && strcmp(var
->name
, "gl_FragDepth") != 0) {
2172 _mesa_glsl_error(loc
, state
,
2173 "depth layout qualifiers can be applied only to "
2175 } else if (depth_layout_count
> 1
2176 && strcmp(var
->name
, "gl_FragDepth") == 0) {
2177 _mesa_glsl_error(loc
, state
,
2178 "at most one depth layout qualifier can be applied to "
2181 if (qual
->flags
.q
.depth_any
)
2182 var
->depth_layout
= ir_depth_layout_any
;
2183 else if (qual
->flags
.q
.depth_greater
)
2184 var
->depth_layout
= ir_depth_layout_greater
;
2185 else if (qual
->flags
.q
.depth_less
)
2186 var
->depth_layout
= ir_depth_layout_less
;
2187 else if (qual
->flags
.q
.depth_unchanged
)
2188 var
->depth_layout
= ir_depth_layout_unchanged
;
2190 var
->depth_layout
= ir_depth_layout_none
;
2194 * Get the variable that is being redeclared by this declaration
2196 * Semantic checks to verify the validity of the redeclaration are also
2197 * performed. If semantic checks fail, compilation error will be emitted via
2198 * \c _mesa_glsl_error, but a non-\c NULL pointer will still be returned.
2201 * A pointer to an existing variable in the current scope if the declaration
2202 * is a redeclaration, \c NULL otherwise.
2205 get_variable_being_redeclared(ir_variable
*var
, ast_declaration
*decl
,
2206 struct _mesa_glsl_parse_state
*state
)
2208 /* Check if this declaration is actually a re-declaration, either to
2209 * resize an array or add qualifiers to an existing variable.
2211 * This is allowed for variables in the current scope, or when at
2212 * global scope (for built-ins in the implicit outer scope).
2214 ir_variable
*earlier
= state
->symbols
->get_variable(decl
->identifier
);
2215 if (earlier
== NULL
||
2216 (state
->current_function
!= NULL
&&
2217 !state
->symbols
->name_declared_this_scope(decl
->identifier
))) {
2222 YYLTYPE loc
= decl
->get_location();
2224 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec,
2226 * "It is legal to declare an array without a size and then
2227 * later re-declare the same name as an array of the same
2228 * type and specify a size."
2230 if ((earlier
->type
->array_size() == 0)
2231 && var
->type
->is_array()
2232 && (var
->type
->element_type() == earlier
->type
->element_type())) {
2233 /* FINISHME: This doesn't match the qualifiers on the two
2234 * FINISHME: declarations. It's not 100% clear whether this is
2235 * FINISHME: required or not.
2238 const unsigned size
= unsigned(var
->type
->array_size());
2239 check_builtin_array_max_size(var
->name
, size
, loc
, state
);
2240 if ((size
> 0) && (size
<= earlier
->max_array_access
)) {
2241 _mesa_glsl_error(& loc
, state
, "array size must be > %u due to "
2243 earlier
->max_array_access
);
2246 earlier
->type
= var
->type
;
2249 } else if (state
->ARB_fragment_coord_conventions_enable
2250 && strcmp(var
->name
, "gl_FragCoord") == 0
2251 && earlier
->type
== var
->type
2252 && earlier
->mode
== var
->mode
) {
2253 /* Allow redeclaration of gl_FragCoord for ARB_fcc layout
2256 earlier
->origin_upper_left
= var
->origin_upper_left
;
2257 earlier
->pixel_center_integer
= var
->pixel_center_integer
;
2259 /* According to section 4.3.7 of the GLSL 1.30 spec,
2260 * the following built-in varaibles can be redeclared with an
2261 * interpolation qualifier:
2264 * * gl_FrontSecondaryColor
2265 * * gl_BackSecondaryColor
2267 * * gl_SecondaryColor
2269 } else if (state
->language_version
>= 130
2270 && (strcmp(var
->name
, "gl_FrontColor") == 0
2271 || strcmp(var
->name
, "gl_BackColor") == 0
2272 || strcmp(var
->name
, "gl_FrontSecondaryColor") == 0
2273 || strcmp(var
->name
, "gl_BackSecondaryColor") == 0
2274 || strcmp(var
->name
, "gl_Color") == 0
2275 || strcmp(var
->name
, "gl_SecondaryColor") == 0)
2276 && earlier
->type
== var
->type
2277 && earlier
->mode
== var
->mode
) {
2278 earlier
->interpolation
= var
->interpolation
;
2280 /* Layout qualifiers for gl_FragDepth. */
2281 } else if ((state
->AMD_conservative_depth_enable
||
2282 state
->ARB_conservative_depth_enable
)
2283 && strcmp(var
->name
, "gl_FragDepth") == 0
2284 && earlier
->type
== var
->type
2285 && earlier
->mode
== var
->mode
) {
2287 /** From the AMD_conservative_depth spec:
2288 * Within any shader, the first redeclarations of gl_FragDepth
2289 * must appear before any use of gl_FragDepth.
2291 if (earlier
->used
) {
2292 _mesa_glsl_error(&loc
, state
,
2293 "the first redeclaration of gl_FragDepth "
2294 "must appear before any use of gl_FragDepth");
2297 /* Prevent inconsistent redeclaration of depth layout qualifier. */
2298 if (earlier
->depth_layout
!= ir_depth_layout_none
2299 && earlier
->depth_layout
!= var
->depth_layout
) {
2300 _mesa_glsl_error(&loc
, state
,
2301 "gl_FragDepth: depth layout is declared here "
2302 "as '%s, but it was previously declared as "
2304 depth_layout_string(var
->depth_layout
),
2305 depth_layout_string(earlier
->depth_layout
));
2308 earlier
->depth_layout
= var
->depth_layout
;
2311 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", decl
->identifier
);
2318 * Generate the IR for an initializer in a variable declaration
2321 process_initializer(ir_variable
*var
, ast_declaration
*decl
,
2322 ast_fully_specified_type
*type
,
2323 exec_list
*initializer_instructions
,
2324 struct _mesa_glsl_parse_state
*state
)
2326 ir_rvalue
*result
= NULL
;
2328 YYLTYPE initializer_loc
= decl
->initializer
->get_location();
2330 /* From page 24 (page 30 of the PDF) of the GLSL 1.10 spec:
2332 * "All uniform variables are read-only and are initialized either
2333 * directly by an application via API commands, or indirectly by
2336 if ((state
->language_version
<= 110)
2337 && (var
->mode
== ir_var_uniform
)) {
2338 _mesa_glsl_error(& initializer_loc
, state
,
2339 "cannot initialize uniforms in GLSL 1.10");
2342 if (var
->type
->is_sampler()) {
2343 _mesa_glsl_error(& initializer_loc
, state
,
2344 "cannot initialize samplers");
2347 if ((var
->mode
== ir_var_in
) && (state
->current_function
== NULL
)) {
2348 _mesa_glsl_error(& initializer_loc
, state
,
2349 "cannot initialize %s shader input / %s",
2350 _mesa_glsl_shader_target_name(state
->target
),
2351 (state
->target
== vertex_shader
)
2352 ? "attribute" : "varying");
2355 ir_dereference
*const lhs
= new(state
) ir_dereference_variable(var
);
2356 ir_rvalue
*rhs
= decl
->initializer
->hir(initializer_instructions
,
2359 /* Calculate the constant value if this is a const or uniform
2362 if (type
->qualifier
.flags
.q
.constant
2363 || type
->qualifier
.flags
.q
.uniform
) {
2364 ir_rvalue
*new_rhs
= validate_assignment(state
, var
->type
, rhs
, true);
2365 if (new_rhs
!= NULL
) {
2368 ir_constant
*constant_value
= rhs
->constant_expression_value();
2369 if (!constant_value
) {
2370 _mesa_glsl_error(& initializer_loc
, state
,
2371 "initializer of %s variable `%s' must be a "
2372 "constant expression",
2373 (type
->qualifier
.flags
.q
.constant
)
2374 ? "const" : "uniform",
2376 if (var
->type
->is_numeric()) {
2377 /* Reduce cascading errors. */
2378 var
->constant_value
= ir_constant::zero(state
, var
->type
);
2381 rhs
= constant_value
;
2382 var
->constant_value
= constant_value
;
2385 _mesa_glsl_error(&initializer_loc
, state
,
2386 "initializer of type %s cannot be assigned to "
2387 "variable of type %s",
2388 rhs
->type
->name
, var
->type
->name
);
2389 if (var
->type
->is_numeric()) {
2390 /* Reduce cascading errors. */
2391 var
->constant_value
= ir_constant::zero(state
, var
->type
);
2396 if (rhs
&& !rhs
->type
->is_error()) {
2397 bool temp
= var
->read_only
;
2398 if (type
->qualifier
.flags
.q
.constant
)
2399 var
->read_only
= false;
2401 /* Never emit code to initialize a uniform.
2403 const glsl_type
*initializer_type
;
2404 if (!type
->qualifier
.flags
.q
.uniform
) {
2405 result
= do_assignment(initializer_instructions
, state
,
2408 type
->get_location());
2409 initializer_type
= result
->type
;
2411 initializer_type
= rhs
->type
;
2413 var
->constant_initializer
= rhs
->constant_expression_value();
2414 var
->has_initializer
= true;
2416 /* If the declared variable is an unsized array, it must inherrit
2417 * its full type from the initializer. A declaration such as
2419 * uniform float a[] = float[](1.0, 2.0, 3.0, 3.0);
2423 * uniform float a[4] = float[](1.0, 2.0, 3.0, 3.0);
2425 * The assignment generated in the if-statement (below) will also
2426 * automatically handle this case for non-uniforms.
2428 * If the declared variable is not an array, the types must
2429 * already match exactly. As a result, the type assignment
2430 * here can be done unconditionally. For non-uniforms the call
2431 * to do_assignment can change the type of the initializer (via
2432 * the implicit conversion rules). For uniforms the initializer
2433 * must be a constant expression, and the type of that expression
2434 * was validated above.
2436 var
->type
= initializer_type
;
2438 var
->read_only
= temp
;
2445 ast_declarator_list::hir(exec_list
*instructions
,
2446 struct _mesa_glsl_parse_state
*state
)
2449 const struct glsl_type
*decl_type
;
2450 const char *type_name
= NULL
;
2451 ir_rvalue
*result
= NULL
;
2452 YYLTYPE loc
= this->get_location();
2454 /* From page 46 (page 52 of the PDF) of the GLSL 1.50 spec:
2456 * "To ensure that a particular output variable is invariant, it is
2457 * necessary to use the invariant qualifier. It can either be used to
2458 * qualify a previously declared variable as being invariant
2460 * invariant gl_Position; // make existing gl_Position be invariant"
2462 * In these cases the parser will set the 'invariant' flag in the declarator
2463 * list, and the type will be NULL.
2465 if (this->invariant
) {
2466 assert(this->type
== NULL
);
2468 if (state
->current_function
!= NULL
) {
2469 _mesa_glsl_error(& loc
, state
,
2470 "All uses of `invariant' keyword must be at global "
2474 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
2475 assert(!decl
->is_array
);
2476 assert(decl
->array_size
== NULL
);
2477 assert(decl
->initializer
== NULL
);
2479 ir_variable
*const earlier
=
2480 state
->symbols
->get_variable(decl
->identifier
);
2481 if (earlier
== NULL
) {
2482 _mesa_glsl_error(& loc
, state
,
2483 "Undeclared variable `%s' cannot be marked "
2484 "invariant\n", decl
->identifier
);
2485 } else if ((state
->target
== vertex_shader
)
2486 && (earlier
->mode
!= ir_var_out
)) {
2487 _mesa_glsl_error(& loc
, state
,
2488 "`%s' cannot be marked invariant, vertex shader "
2489 "outputs only\n", decl
->identifier
);
2490 } else if ((state
->target
== fragment_shader
)
2491 && (earlier
->mode
!= ir_var_in
)) {
2492 _mesa_glsl_error(& loc
, state
,
2493 "`%s' cannot be marked invariant, fragment shader "
2494 "inputs only\n", decl
->identifier
);
2495 } else if (earlier
->used
) {
2496 _mesa_glsl_error(& loc
, state
,
2497 "variable `%s' may not be redeclared "
2498 "`invariant' after being used",
2501 earlier
->invariant
= true;
2505 /* Invariant redeclarations do not have r-values.
2510 assert(this->type
!= NULL
);
2511 assert(!this->invariant
);
2513 /* The type specifier may contain a structure definition. Process that
2514 * before any of the variable declarations.
2516 (void) this->type
->specifier
->hir(instructions
, state
);
2518 decl_type
= this->type
->specifier
->glsl_type(& type_name
, state
);
2519 if (this->declarations
.is_empty()) {
2520 /* If there is no structure involved in the program text, there are two
2521 * possible scenarios:
2523 * - The program text contained something like 'vec4;'. This is an
2524 * empty declaration. It is valid but weird. Emit a warning.
2526 * - The program text contained something like 'S;' and 'S' is not the
2527 * name of a known structure type. This is both invalid and weird.
2530 * Note that if decl_type is NULL and there is a structure involved,
2531 * there must have been some sort of error with the structure. In this
2532 * case we assume that an error was already generated on this line of
2533 * code for the structure. There is no need to generate an additional,
2536 assert(this->type
->specifier
->structure
== NULL
|| decl_type
!= NULL
2538 if (this->type
->specifier
->structure
== NULL
) {
2539 if (decl_type
!= NULL
) {
2540 _mesa_glsl_warning(&loc
, state
, "empty declaration");
2542 _mesa_glsl_error(&loc
, state
,
2543 "invalid type `%s' in empty declaration",
2549 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
2550 const struct glsl_type
*var_type
;
2553 /* FINISHME: Emit a warning if a variable declaration shadows a
2554 * FINISHME: declaration at a higher scope.
2557 if ((decl_type
== NULL
) || decl_type
->is_void()) {
2558 if (type_name
!= NULL
) {
2559 _mesa_glsl_error(& loc
, state
,
2560 "invalid type `%s' in declaration of `%s'",
2561 type_name
, decl
->identifier
);
2563 _mesa_glsl_error(& loc
, state
,
2564 "invalid type in declaration of `%s'",
2570 if (decl
->is_array
) {
2571 var_type
= process_array_type(&loc
, decl_type
, decl
->array_size
,
2573 if (var_type
->is_error())
2576 var_type
= decl_type
;
2579 var
= new(ctx
) ir_variable(var_type
, decl
->identifier
, ir_var_auto
);
2581 /* From page 22 (page 28 of the PDF) of the GLSL 1.10 specification;
2583 * "Global variables can only use the qualifiers const,
2584 * attribute, uni form, or varying. Only one may be
2587 * Local variables can only use the qualifier const."
2589 * This is relaxed in GLSL 1.30. It is also relaxed by any extension
2590 * that adds the 'layout' keyword.
2592 if ((state
->language_version
< 130)
2593 && !state
->ARB_explicit_attrib_location_enable
2594 && !state
->ARB_fragment_coord_conventions_enable
) {
2595 if (this->type
->qualifier
.flags
.q
.out
) {
2596 _mesa_glsl_error(& loc
, state
,
2597 "`out' qualifier in declaration of `%s' "
2598 "only valid for function parameters in %s.",
2599 decl
->identifier
, state
->version_string
);
2601 if (this->type
->qualifier
.flags
.q
.in
) {
2602 _mesa_glsl_error(& loc
, state
,
2603 "`in' qualifier in declaration of `%s' "
2604 "only valid for function parameters in %s.",
2605 decl
->identifier
, state
->version_string
);
2607 /* FINISHME: Test for other invalid qualifiers. */
2610 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
,
2613 if (this->type
->qualifier
.flags
.q
.invariant
) {
2614 if ((state
->target
== vertex_shader
) && !(var
->mode
== ir_var_out
||
2615 var
->mode
== ir_var_inout
)) {
2616 /* FINISHME: Note that this doesn't work for invariant on
2617 * a function signature outval
2619 _mesa_glsl_error(& loc
, state
,
2620 "`%s' cannot be marked invariant, vertex shader "
2621 "outputs only\n", var
->name
);
2622 } else if ((state
->target
== fragment_shader
) &&
2623 !(var
->mode
== ir_var_in
|| var
->mode
== ir_var_inout
)) {
2624 /* FINISHME: Note that this doesn't work for invariant on
2625 * a function signature inval
2627 _mesa_glsl_error(& loc
, state
,
2628 "`%s' cannot be marked invariant, fragment shader "
2629 "inputs only\n", var
->name
);
2633 if (state
->current_function
!= NULL
) {
2634 const char *mode
= NULL
;
2635 const char *extra
= "";
2637 /* There is no need to check for 'inout' here because the parser will
2638 * only allow that in function parameter lists.
2640 if (this->type
->qualifier
.flags
.q
.attribute
) {
2642 } else if (this->type
->qualifier
.flags
.q
.uniform
) {
2644 } else if (this->type
->qualifier
.flags
.q
.varying
) {
2646 } else if (this->type
->qualifier
.flags
.q
.in
) {
2648 extra
= " or in function parameter list";
2649 } else if (this->type
->qualifier
.flags
.q
.out
) {
2651 extra
= " or in function parameter list";
2655 _mesa_glsl_error(& loc
, state
,
2656 "%s variable `%s' must be declared at "
2658 mode
, var
->name
, extra
);
2660 } else if (var
->mode
== ir_var_in
) {
2661 var
->read_only
= true;
2663 if (state
->target
== vertex_shader
) {
2664 bool error_emitted
= false;
2666 /* From page 31 (page 37 of the PDF) of the GLSL 1.50 spec:
2668 * "Vertex shader inputs can only be float, floating-point
2669 * vectors, matrices, signed and unsigned integers and integer
2670 * vectors. Vertex shader inputs can also form arrays of these
2671 * types, but not structures."
2673 * From page 31 (page 27 of the PDF) of the GLSL 1.30 spec:
2675 * "Vertex shader inputs can only be float, floating-point
2676 * vectors, matrices, signed and unsigned integers and integer
2677 * vectors. They cannot be arrays or structures."
2679 * From page 23 (page 29 of the PDF) of the GLSL 1.20 spec:
2681 * "The attribute qualifier can be used only with float,
2682 * floating-point vectors, and matrices. Attribute variables
2683 * cannot be declared as arrays or structures."
2685 const glsl_type
*check_type
= var
->type
->is_array()
2686 ? var
->type
->fields
.array
: var
->type
;
2688 switch (check_type
->base_type
) {
2689 case GLSL_TYPE_FLOAT
:
2691 case GLSL_TYPE_UINT
:
2693 if (state
->language_version
> 120)
2697 _mesa_glsl_error(& loc
, state
,
2698 "vertex shader input / attribute cannot have "
2700 var
->type
->is_array() ? "array of " : "",
2702 error_emitted
= true;
2705 if (!error_emitted
&& (state
->language_version
<= 130)
2706 && var
->type
->is_array()) {
2707 _mesa_glsl_error(& loc
, state
,
2708 "vertex shader input / attribute cannot have "
2710 error_emitted
= true;
2715 /* Integer vertex outputs must be qualified with 'flat'.
2717 * From section 4.3.6 of the GLSL 1.30 spec:
2718 * "If a vertex output is a signed or unsigned integer or integer
2719 * vector, then it must be qualified with the interpolation qualifier
2722 if (state
->language_version
>= 130
2723 && state
->target
== vertex_shader
2724 && state
->current_function
== NULL
2725 && var
->type
->is_integer()
2726 && var
->mode
== ir_var_out
2727 && var
->interpolation
!= INTERP_QUALIFIER_FLAT
) {
2729 _mesa_glsl_error(&loc
, state
, "If a vertex output is an integer, "
2730 "then it must be qualified with 'flat'");
2734 /* Interpolation qualifiers cannot be applied to 'centroid' and
2735 * 'centroid varying'.
2737 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
2738 * "interpolation qualifiers may only precede the qualifiers in,
2739 * centroid in, out, or centroid out in a declaration. They do not apply
2740 * to the deprecated storage qualifiers varying or centroid varying."
2742 if (state
->language_version
>= 130
2743 && this->type
->qualifier
.has_interpolation()
2744 && this->type
->qualifier
.flags
.q
.varying
) {
2746 const char *i
= this->type
->qualifier
.interpolation_string();
2749 if (this->type
->qualifier
.flags
.q
.centroid
)
2750 s
= "centroid varying";
2754 _mesa_glsl_error(&loc
, state
,
2755 "qualifier '%s' cannot be applied to the "
2756 "deprecated storage qualifier '%s'", i
, s
);
2760 /* Interpolation qualifiers can only apply to vertex shader outputs and
2761 * fragment shader inputs.
2763 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
2764 * "Outputs from a vertex shader (out) and inputs to a fragment
2765 * shader (in) can be further qualified with one or more of these
2766 * interpolation qualifiers"
2768 if (state
->language_version
>= 130
2769 && this->type
->qualifier
.has_interpolation()) {
2771 const char *i
= this->type
->qualifier
.interpolation_string();
2774 switch (state
->target
) {
2776 if (this->type
->qualifier
.flags
.q
.in
) {
2777 _mesa_glsl_error(&loc
, state
,
2778 "qualifier '%s' cannot be applied to vertex "
2779 "shader inputs", i
);
2782 case fragment_shader
:
2783 if (this->type
->qualifier
.flags
.q
.out
) {
2784 _mesa_glsl_error(&loc
, state
,
2785 "qualifier '%s' cannot be applied to fragment "
2786 "shader outputs", i
);
2795 /* From section 4.3.4 of the GLSL 1.30 spec:
2796 * "It is an error to use centroid in in a vertex shader."
2798 if (state
->language_version
>= 130
2799 && this->type
->qualifier
.flags
.q
.centroid
2800 && this->type
->qualifier
.flags
.q
.in
2801 && state
->target
== vertex_shader
) {
2803 _mesa_glsl_error(&loc
, state
,
2804 "'centroid in' cannot be used in a vertex shader");
2808 /* Precision qualifiers exists only in GLSL versions 1.00 and >= 1.30.
2810 if (this->type
->specifier
->precision
!= ast_precision_none
2811 && state
->language_version
!= 100
2812 && state
->language_version
< 130) {
2814 _mesa_glsl_error(&loc
, state
,
2815 "precision qualifiers are supported only in GLSL ES "
2816 "1.00, and GLSL 1.30 and later");
2820 /* Precision qualifiers only apply to floating point and integer types.
2822 * From section 4.5.2 of the GLSL 1.30 spec:
2823 * "Any floating point or any integer declaration can have the type
2824 * preceded by one of these precision qualifiers [...] Literal
2825 * constants do not have precision qualifiers. Neither do Boolean
2828 * In GLSL ES, sampler types are also allowed.
2830 * From page 87 of the GLSL ES spec:
2831 * "RESOLUTION: Allow sampler types to take a precision qualifier."
2833 if (this->type
->specifier
->precision
!= ast_precision_none
2834 && !var
->type
->is_float()
2835 && !var
->type
->is_integer()
2836 && !(var
->type
->is_sampler() && state
->es_shader
)
2837 && !(var
->type
->is_array()
2838 && (var
->type
->fields
.array
->is_float()
2839 || var
->type
->fields
.array
->is_integer()))) {
2841 _mesa_glsl_error(&loc
, state
,
2842 "precision qualifiers apply only to floating point"
2843 "%s types", state
->es_shader
? ", integer, and sampler"
2847 /* From page 17 (page 23 of the PDF) of the GLSL 1.20 spec:
2849 * "[Sampler types] can only be declared as function
2850 * parameters or uniform variables (see Section 4.3.5
2853 if (var_type
->contains_sampler() &&
2854 !this->type
->qualifier
.flags
.q
.uniform
) {
2855 _mesa_glsl_error(&loc
, state
, "samplers must be declared uniform");
2858 /* Process the initializer and add its instructions to a temporary
2859 * list. This list will be added to the instruction stream (below) after
2860 * the declaration is added. This is done because in some cases (such as
2861 * redeclarations) the declaration may not actually be added to the
2862 * instruction stream.
2864 exec_list initializer_instructions
;
2865 ir_variable
*earlier
= get_variable_being_redeclared(var
, decl
, state
);
2867 if (decl
->initializer
!= NULL
) {
2868 result
= process_initializer((earlier
== NULL
) ? var
: earlier
,
2870 &initializer_instructions
, state
);
2873 /* From page 23 (page 29 of the PDF) of the GLSL 1.10 spec:
2875 * "It is an error to write to a const variable outside of
2876 * its declaration, so they must be initialized when
2879 if (this->type
->qualifier
.flags
.q
.constant
&& decl
->initializer
== NULL
) {
2880 _mesa_glsl_error(& loc
, state
,
2881 "const declaration of `%s' must be initialized",
2885 /* If the declaration is not a redeclaration, there are a few additional
2886 * semantic checks that must be applied. In addition, variable that was
2887 * created for the declaration should be added to the IR stream.
2889 if (earlier
== NULL
) {
2890 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
2892 * "Identifiers starting with "gl_" are reserved for use by
2893 * OpenGL, and may not be declared in a shader as either a
2894 * variable or a function."
2896 if (strncmp(decl
->identifier
, "gl_", 3) == 0)
2897 _mesa_glsl_error(& loc
, state
,
2898 "identifier `%s' uses reserved `gl_' prefix",
2900 else if (strstr(decl
->identifier
, "__")) {
2901 /* From page 14 (page 20 of the PDF) of the GLSL 1.10
2904 * "In addition, all identifiers containing two
2905 * consecutive underscores (__) are reserved as
2906 * possible future keywords."
2908 _mesa_glsl_error(& loc
, state
,
2909 "identifier `%s' uses reserved `__' string",
2913 /* Add the variable to the symbol table. Note that the initializer's
2914 * IR was already processed earlier (though it hasn't been emitted
2915 * yet), without the variable in scope.
2917 * This differs from most C-like languages, but it follows the GLSL
2918 * specification. From page 28 (page 34 of the PDF) of the GLSL 1.50
2921 * "Within a declaration, the scope of a name starts immediately
2922 * after the initializer if present or immediately after the name
2923 * being declared if not."
2925 if (!state
->symbols
->add_variable(var
)) {
2926 YYLTYPE loc
= this->get_location();
2927 _mesa_glsl_error(&loc
, state
, "name `%s' already taken in the "
2928 "current scope", decl
->identifier
);
2932 /* Push the variable declaration to the top. It means that all the
2933 * variable declarations will appear in a funny last-to-first order,
2934 * but otherwise we run into trouble if a function is prototyped, a
2935 * global var is decled, then the function is defined with usage of
2936 * the global var. See glslparsertest's CorrectModule.frag.
2938 instructions
->push_head(var
);
2941 instructions
->append_list(&initializer_instructions
);
2945 /* Generally, variable declarations do not have r-values. However,
2946 * one is used for the declaration in
2948 * while (bool b = some_condition()) {
2952 * so we return the rvalue from the last seen declaration here.
2959 ast_parameter_declarator::hir(exec_list
*instructions
,
2960 struct _mesa_glsl_parse_state
*state
)
2963 const struct glsl_type
*type
;
2964 const char *name
= NULL
;
2965 YYLTYPE loc
= this->get_location();
2967 type
= this->type
->specifier
->glsl_type(& name
, state
);
2971 _mesa_glsl_error(& loc
, state
,
2972 "invalid type `%s' in declaration of `%s'",
2973 name
, this->identifier
);
2975 _mesa_glsl_error(& loc
, state
,
2976 "invalid type in declaration of `%s'",
2980 type
= glsl_type::error_type
;
2983 /* From page 62 (page 68 of the PDF) of the GLSL 1.50 spec:
2985 * "Functions that accept no input arguments need not use void in the
2986 * argument list because prototypes (or definitions) are required and
2987 * therefore there is no ambiguity when an empty argument list "( )" is
2988 * declared. The idiom "(void)" as a parameter list is provided for
2991 * Placing this check here prevents a void parameter being set up
2992 * for a function, which avoids tripping up checks for main taking
2993 * parameters and lookups of an unnamed symbol.
2995 if (type
->is_void()) {
2996 if (this->identifier
!= NULL
)
2997 _mesa_glsl_error(& loc
, state
,
2998 "named parameter cannot have type `void'");
3004 if (formal_parameter
&& (this->identifier
== NULL
)) {
3005 _mesa_glsl_error(& loc
, state
, "formal parameter lacks a name");
3009 /* This only handles "vec4 foo[..]". The earlier specifier->glsl_type(...)
3010 * call already handled the "vec4[..] foo" case.
3012 if (this->is_array
) {
3013 type
= process_array_type(&loc
, type
, this->array_size
, state
);
3016 if (!type
->is_error() && type
->array_size() == 0) {
3017 _mesa_glsl_error(&loc
, state
, "arrays passed as parameters must have "
3018 "a declared size.");
3019 type
= glsl_type::error_type
;
3023 ir_variable
*var
= new(ctx
) ir_variable(type
, this->identifier
, ir_var_in
);
3025 /* Apply any specified qualifiers to the parameter declaration. Note that
3026 * for function parameters the default mode is 'in'.
3028 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
, & loc
);
3030 /* From page 17 (page 23 of the PDF) of the GLSL 1.20 spec:
3032 * "Samplers cannot be treated as l-values; hence cannot be used
3033 * as out or inout function parameters, nor can they be assigned
3036 if ((var
->mode
== ir_var_inout
|| var
->mode
== ir_var_out
)
3037 && type
->contains_sampler()) {
3038 _mesa_glsl_error(&loc
, state
, "out and inout parameters cannot contain samplers");
3039 type
= glsl_type::error_type
;
3042 /* From page 39 (page 45 of the PDF) of the GLSL 1.10 spec:
3044 * "When calling a function, expressions that do not evaluate to
3045 * l-values cannot be passed to parameters declared as out or inout."
3047 * From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
3049 * "Other binary or unary expressions, non-dereferenced arrays,
3050 * function names, swizzles with repeated fields, and constants
3051 * cannot be l-values."
3053 * So for GLSL 1.10, passing an array as an out or inout parameter is not
3054 * allowed. This restriction is removed in GLSL 1.20, and in GLSL ES.
3056 if ((var
->mode
== ir_var_inout
|| var
->mode
== ir_var_out
)
3057 && type
->is_array() && state
->language_version
== 110) {
3058 _mesa_glsl_error(&loc
, state
, "Arrays cannot be out or inout parameters in GLSL 1.10");
3059 type
= glsl_type::error_type
;
3062 instructions
->push_tail(var
);
3064 /* Parameter declarations do not have r-values.
3071 ast_parameter_declarator::parameters_to_hir(exec_list
*ast_parameters
,
3073 exec_list
*ir_parameters
,
3074 _mesa_glsl_parse_state
*state
)
3076 ast_parameter_declarator
*void_param
= NULL
;
3079 foreach_list_typed (ast_parameter_declarator
, param
, link
, ast_parameters
) {
3080 param
->formal_parameter
= formal
;
3081 param
->hir(ir_parameters
, state
);
3089 if ((void_param
!= NULL
) && (count
> 1)) {
3090 YYLTYPE loc
= void_param
->get_location();
3092 _mesa_glsl_error(& loc
, state
,
3093 "`void' parameter must be only parameter");
3099 emit_function(_mesa_glsl_parse_state
*state
, ir_function
*f
)
3101 /* IR invariants disallow function declarations or definitions
3102 * nested within other function definitions. But there is no
3103 * requirement about the relative order of function declarations
3104 * and definitions with respect to one another. So simply insert
3105 * the new ir_function block at the end of the toplevel instruction
3108 state
->toplevel_ir
->push_tail(f
);
3113 ast_function::hir(exec_list
*instructions
,
3114 struct _mesa_glsl_parse_state
*state
)
3117 ir_function
*f
= NULL
;
3118 ir_function_signature
*sig
= NULL
;
3119 exec_list hir_parameters
;
3121 const char *const name
= identifier
;
3123 /* New functions are always added to the top-level IR instruction stream,
3124 * so this instruction list pointer is ignored. See also emit_function
3127 (void) instructions
;
3129 /* From page 21 (page 27 of the PDF) of the GLSL 1.20 spec,
3131 * "Function declarations (prototypes) cannot occur inside of functions;
3132 * they must be at global scope, or for the built-in functions, outside
3133 * the global scope."
3135 * From page 27 (page 33 of the PDF) of the GLSL ES 1.00.16 spec,
3137 * "User defined functions may only be defined within the global scope."
3139 * Note that this language does not appear in GLSL 1.10.
3141 if ((state
->current_function
!= NULL
) && (state
->language_version
!= 110)) {
3142 YYLTYPE loc
= this->get_location();
3143 _mesa_glsl_error(&loc
, state
,
3144 "declaration of function `%s' not allowed within "
3145 "function body", name
);
3148 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
3150 * "Identifiers starting with "gl_" are reserved for use by
3151 * OpenGL, and may not be declared in a shader as either a
3152 * variable or a function."
3154 if (strncmp(name
, "gl_", 3) == 0) {
3155 YYLTYPE loc
= this->get_location();
3156 _mesa_glsl_error(&loc
, state
,
3157 "identifier `%s' uses reserved `gl_' prefix", name
);
3160 /* Convert the list of function parameters to HIR now so that they can be
3161 * used below to compare this function's signature with previously seen
3162 * signatures for functions with the same name.
3164 ast_parameter_declarator::parameters_to_hir(& this->parameters
,
3166 & hir_parameters
, state
);
3168 const char *return_type_name
;
3169 const glsl_type
*return_type
=
3170 this->return_type
->specifier
->glsl_type(& return_type_name
, state
);
3173 YYLTYPE loc
= this->get_location();
3174 _mesa_glsl_error(&loc
, state
,
3175 "function `%s' has undeclared return type `%s'",
3176 name
, return_type_name
);
3177 return_type
= glsl_type::error_type
;
3180 /* From page 56 (page 62 of the PDF) of the GLSL 1.30 spec:
3181 * "No qualifier is allowed on the return type of a function."
3183 if (this->return_type
->has_qualifiers()) {
3184 YYLTYPE loc
= this->get_location();
3185 _mesa_glsl_error(& loc
, state
,
3186 "function `%s' return type has qualifiers", name
);
3189 /* From page 17 (page 23 of the PDF) of the GLSL 1.20 spec:
3191 * "[Sampler types] can only be declared as function parameters
3192 * or uniform variables (see Section 4.3.5 "Uniform")".
3194 if (return_type
->contains_sampler()) {
3195 YYLTYPE loc
= this->get_location();
3196 _mesa_glsl_error(&loc
, state
,
3197 "function `%s' return type can't contain a sampler",
3201 /* Verify that this function's signature either doesn't match a previously
3202 * seen signature for a function with the same name, or, if a match is found,
3203 * that the previously seen signature does not have an associated definition.
3205 f
= state
->symbols
->get_function(name
);
3206 if (f
!= NULL
&& (state
->es_shader
|| f
->has_user_signature())) {
3207 sig
= f
->exact_matching_signature(&hir_parameters
);
3209 const char *badvar
= sig
->qualifiers_match(&hir_parameters
);
3210 if (badvar
!= NULL
) {
3211 YYLTYPE loc
= this->get_location();
3213 _mesa_glsl_error(&loc
, state
, "function `%s' parameter `%s' "
3214 "qualifiers don't match prototype", name
, badvar
);
3217 if (sig
->return_type
!= return_type
) {
3218 YYLTYPE loc
= this->get_location();
3220 _mesa_glsl_error(&loc
, state
, "function `%s' return type doesn't "
3221 "match prototype", name
);
3224 if (is_definition
&& sig
->is_defined
) {
3225 YYLTYPE loc
= this->get_location();
3227 _mesa_glsl_error(& loc
, state
, "function `%s' redefined", name
);
3231 f
= new(ctx
) ir_function(name
);
3232 if (!state
->symbols
->add_function(f
)) {
3233 /* This function name shadows a non-function use of the same name. */
3234 YYLTYPE loc
= this->get_location();
3236 _mesa_glsl_error(&loc
, state
, "function name `%s' conflicts with "
3237 "non-function", name
);
3241 emit_function(state
, f
);
3244 /* Verify the return type of main() */
3245 if (strcmp(name
, "main") == 0) {
3246 if (! return_type
->is_void()) {
3247 YYLTYPE loc
= this->get_location();
3249 _mesa_glsl_error(& loc
, state
, "main() must return void");
3252 if (!hir_parameters
.is_empty()) {
3253 YYLTYPE loc
= this->get_location();
3255 _mesa_glsl_error(& loc
, state
, "main() must not take any parameters");
3259 /* Finish storing the information about this new function in its signature.
3262 sig
= new(ctx
) ir_function_signature(return_type
);
3263 f
->add_signature(sig
);
3266 sig
->replace_parameters(&hir_parameters
);
3269 /* Function declarations (prototypes) do not have r-values.
3276 ast_function_definition::hir(exec_list
*instructions
,
3277 struct _mesa_glsl_parse_state
*state
)
3279 prototype
->is_definition
= true;
3280 prototype
->hir(instructions
, state
);
3282 ir_function_signature
*signature
= prototype
->signature
;
3283 if (signature
== NULL
)
3286 assert(state
->current_function
== NULL
);
3287 state
->current_function
= signature
;
3288 state
->found_return
= false;
3290 /* Duplicate parameters declared in the prototype as concrete variables.
3291 * Add these to the symbol table.
3293 state
->symbols
->push_scope();
3294 foreach_iter(exec_list_iterator
, iter
, signature
->parameters
) {
3295 ir_variable
*const var
= ((ir_instruction
*) iter
.get())->as_variable();
3297 assert(var
!= NULL
);
3299 /* The only way a parameter would "exist" is if two parameters have
3302 if (state
->symbols
->name_declared_this_scope(var
->name
)) {
3303 YYLTYPE loc
= this->get_location();
3305 _mesa_glsl_error(& loc
, state
, "parameter `%s' redeclared", var
->name
);
3307 state
->symbols
->add_variable(var
);
3311 /* Convert the body of the function to HIR. */
3312 this->body
->hir(&signature
->body
, state
);
3313 signature
->is_defined
= true;
3315 state
->symbols
->pop_scope();
3317 assert(state
->current_function
== signature
);
3318 state
->current_function
= NULL
;
3320 if (!signature
->return_type
->is_void() && !state
->found_return
) {
3321 YYLTYPE loc
= this->get_location();
3322 _mesa_glsl_error(& loc
, state
, "function `%s' has non-void return type "
3323 "%s, but no return statement",
3324 signature
->function_name(),
3325 signature
->return_type
->name
);
3328 /* Function definitions do not have r-values.
3335 ast_jump_statement::hir(exec_list
*instructions
,
3336 struct _mesa_glsl_parse_state
*state
)
3343 assert(state
->current_function
);
3345 if (opt_return_value
) {
3346 ir_rvalue
*const ret
= opt_return_value
->hir(instructions
, state
);
3348 /* The value of the return type can be NULL if the shader says
3349 * 'return foo();' and foo() is a function that returns void.
3351 * NOTE: The GLSL spec doesn't say that this is an error. The type
3352 * of the return value is void. If the return type of the function is
3353 * also void, then this should compile without error. Seriously.
3355 const glsl_type
*const ret_type
=
3356 (ret
== NULL
) ? glsl_type::void_type
: ret
->type
;
3358 /* Implicit conversions are not allowed for return values. */
3359 if (state
->current_function
->return_type
!= ret_type
) {
3360 YYLTYPE loc
= this->get_location();
3362 _mesa_glsl_error(& loc
, state
,
3363 "`return' with wrong type %s, in function `%s' "
3366 state
->current_function
->function_name(),
3367 state
->current_function
->return_type
->name
);
3370 inst
= new(ctx
) ir_return(ret
);
3372 if (state
->current_function
->return_type
->base_type
!=
3374 YYLTYPE loc
= this->get_location();
3376 _mesa_glsl_error(& loc
, state
,
3377 "`return' with no value, in function %s returning "
3379 state
->current_function
->function_name());
3381 inst
= new(ctx
) ir_return
;
3384 state
->found_return
= true;
3385 instructions
->push_tail(inst
);
3390 if (state
->target
!= fragment_shader
) {
3391 YYLTYPE loc
= this->get_location();
3393 _mesa_glsl_error(& loc
, state
,
3394 "`discard' may only appear in a fragment shader");
3396 instructions
->push_tail(new(ctx
) ir_discard
);
3401 if (mode
== ast_continue
&&
3402 state
->loop_nesting_ast
== NULL
) {
3403 YYLTYPE loc
= this->get_location();
3405 _mesa_glsl_error(& loc
, state
,
3406 "continue may only appear in a loop");
3407 } else if (mode
== ast_break
&&
3408 state
->loop_nesting_ast
== NULL
&&
3409 state
->switch_state
.switch_nesting_ast
== NULL
) {
3410 YYLTYPE loc
= this->get_location();
3412 _mesa_glsl_error(& loc
, state
,
3413 "break may only appear in a loop or a switch");
3415 /* For a loop, inline the for loop expression again,
3416 * since we don't know where near the end of
3417 * the loop body the normal copy of it
3418 * is going to be placed.
3420 if (state
->loop_nesting_ast
!= NULL
&&
3421 mode
== ast_continue
&&
3422 state
->loop_nesting_ast
->rest_expression
) {
3423 state
->loop_nesting_ast
->rest_expression
->hir(instructions
,
3427 if (state
->switch_state
.is_switch_innermost
&&
3428 mode
== ast_break
) {
3429 /* Force break out of switch by setting is_break switch state.
3431 ir_variable
*const is_break_var
= state
->switch_state
.is_break_var
;
3432 ir_dereference_variable
*const deref_is_break_var
=
3433 new(ctx
) ir_dereference_variable(is_break_var
);
3434 ir_constant
*const true_val
= new(ctx
) ir_constant(true);
3435 ir_assignment
*const set_break_var
=
3436 new(ctx
) ir_assignment(deref_is_break_var
,
3440 instructions
->push_tail(set_break_var
);
3443 ir_loop_jump
*const jump
=
3444 new(ctx
) ir_loop_jump((mode
== ast_break
)
3445 ? ir_loop_jump::jump_break
3446 : ir_loop_jump::jump_continue
);
3447 instructions
->push_tail(jump
);
3454 /* Jump instructions do not have r-values.
3461 ast_selection_statement::hir(exec_list
*instructions
,
3462 struct _mesa_glsl_parse_state
*state
)
3466 ir_rvalue
*const condition
= this->condition
->hir(instructions
, state
);
3468 /* From page 66 (page 72 of the PDF) of the GLSL 1.50 spec:
3470 * "Any expression whose type evaluates to a Boolean can be used as the
3471 * conditional expression bool-expression. Vector types are not accepted
3472 * as the expression to if."
3474 * The checks are separated so that higher quality diagnostics can be
3475 * generated for cases where both rules are violated.
3477 if (!condition
->type
->is_boolean() || !condition
->type
->is_scalar()) {
3478 YYLTYPE loc
= this->condition
->get_location();
3480 _mesa_glsl_error(& loc
, state
, "if-statement condition must be scalar "
3484 ir_if
*const stmt
= new(ctx
) ir_if(condition
);
3486 if (then_statement
!= NULL
) {
3487 state
->symbols
->push_scope();
3488 then_statement
->hir(& stmt
->then_instructions
, state
);
3489 state
->symbols
->pop_scope();
3492 if (else_statement
!= NULL
) {
3493 state
->symbols
->push_scope();
3494 else_statement
->hir(& stmt
->else_instructions
, state
);
3495 state
->symbols
->pop_scope();
3498 instructions
->push_tail(stmt
);
3500 /* if-statements do not have r-values.
3507 ast_switch_statement::hir(exec_list
*instructions
,
3508 struct _mesa_glsl_parse_state
*state
)
3512 ir_rvalue
*const test_expression
=
3513 this->test_expression
->hir(instructions
, state
);
3515 /* From page 66 (page 55 of the PDF) of the GLSL 1.50 spec:
3517 * "The type of init-expression in a switch statement must be a
3520 if (!test_expression
->type
->is_scalar() ||
3521 !test_expression
->type
->is_integer()) {
3522 YYLTYPE loc
= this->test_expression
->get_location();
3524 _mesa_glsl_error(& loc
,
3526 "switch-statement expression must be scalar "
3530 /* Track the switch-statement nesting in a stack-like manner.
3532 struct glsl_switch_state saved
= state
->switch_state
;
3534 state
->switch_state
.is_switch_innermost
= true;
3535 state
->switch_state
.switch_nesting_ast
= this;
3536 state
->switch_state
.labels_ht
= hash_table_ctor(0, hash_table_pointer_hash
,
3537 hash_table_pointer_compare
);
3538 state
->switch_state
.previous_default
= NULL
;
3540 /* Initalize is_fallthru state to false.
3542 ir_rvalue
*const is_fallthru_val
= new (ctx
) ir_constant(false);
3543 state
->switch_state
.is_fallthru_var
=
3544 new(ctx
) ir_variable(glsl_type::bool_type
,
3545 "switch_is_fallthru_tmp",
3547 instructions
->push_tail(state
->switch_state
.is_fallthru_var
);
3549 ir_dereference_variable
*deref_is_fallthru_var
=
3550 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
3551 instructions
->push_tail(new(ctx
) ir_assignment(deref_is_fallthru_var
,
3555 /* Initalize is_break state to false.
3557 ir_rvalue
*const is_break_val
= new (ctx
) ir_constant(false);
3558 state
->switch_state
.is_break_var
= new(ctx
) ir_variable(glsl_type::bool_type
,
3559 "switch_is_break_tmp",
3561 instructions
->push_tail(state
->switch_state
.is_break_var
);
3563 ir_dereference_variable
*deref_is_break_var
=
3564 new(ctx
) ir_dereference_variable(state
->switch_state
.is_break_var
);
3565 instructions
->push_tail(new(ctx
) ir_assignment(deref_is_break_var
,
3569 /* Cache test expression.
3571 test_to_hir(instructions
, state
);
3573 /* Emit code for body of switch stmt.
3575 body
->hir(instructions
, state
);
3577 hash_table_dtor(state
->switch_state
.labels_ht
);
3579 state
->switch_state
= saved
;
3581 /* Switch statements do not have r-values. */
3587 ast_switch_statement::test_to_hir(exec_list
*instructions
,
3588 struct _mesa_glsl_parse_state
*state
)
3592 /* Cache value of test expression. */
3593 ir_rvalue
*const test_val
=
3594 test_expression
->hir(instructions
,
3597 state
->switch_state
.test_var
= new(ctx
) ir_variable(test_val
->type
,
3600 ir_dereference_variable
*deref_test_var
=
3601 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
3603 instructions
->push_tail(state
->switch_state
.test_var
);
3604 instructions
->push_tail(new(ctx
) ir_assignment(deref_test_var
, test_val
,
3610 ast_switch_body::hir(exec_list
*instructions
,
3611 struct _mesa_glsl_parse_state
*state
)
3614 stmts
->hir(instructions
, state
);
3616 /* Switch bodies do not have r-values. */
3621 ast_case_statement_list::hir(exec_list
*instructions
,
3622 struct _mesa_glsl_parse_state
*state
)
3624 foreach_list_typed (ast_case_statement
, case_stmt
, link
, & this->cases
)
3625 case_stmt
->hir(instructions
, state
);
3627 /* Case statements do not have r-values. */
3632 ast_case_statement::hir(exec_list
*instructions
,
3633 struct _mesa_glsl_parse_state
*state
)
3635 labels
->hir(instructions
, state
);
3637 /* Conditionally set fallthru state based on break state. */
3638 ir_constant
*const false_val
= new(state
) ir_constant(false);
3639 ir_dereference_variable
*const deref_is_fallthru_var
=
3640 new(state
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
3641 ir_dereference_variable
*const deref_is_break_var
=
3642 new(state
) ir_dereference_variable(state
->switch_state
.is_break_var
);
3643 ir_assignment
*const reset_fallthru_on_break
=
3644 new(state
) ir_assignment(deref_is_fallthru_var
,
3646 deref_is_break_var
);
3647 instructions
->push_tail(reset_fallthru_on_break
);
3649 /* Guard case statements depending on fallthru state. */
3650 ir_dereference_variable
*const deref_fallthru_guard
=
3651 new(state
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
3652 ir_if
*const test_fallthru
= new(state
) ir_if(deref_fallthru_guard
);
3654 foreach_list_typed (ast_node
, stmt
, link
, & this->stmts
)
3655 stmt
->hir(& test_fallthru
->then_instructions
, state
);
3657 instructions
->push_tail(test_fallthru
);
3659 /* Case statements do not have r-values. */
3665 ast_case_label_list::hir(exec_list
*instructions
,
3666 struct _mesa_glsl_parse_state
*state
)
3668 foreach_list_typed (ast_case_label
, label
, link
, & this->labels
)
3669 label
->hir(instructions
, state
);
3671 /* Case labels do not have r-values. */
3676 ast_case_label::hir(exec_list
*instructions
,
3677 struct _mesa_glsl_parse_state
*state
)
3681 ir_dereference_variable
*deref_fallthru_var
=
3682 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
3684 ir_rvalue
*const true_val
= new(ctx
) ir_constant(true);
3686 /* If not default case, ... */
3687 if (this->test_value
!= NULL
) {
3688 /* Conditionally set fallthru state based on
3689 * comparison of cached test expression value to case label.
3691 ir_rvalue
*const label_rval
= this->test_value
->hir(instructions
, state
);
3692 ir_constant
*label_const
= label_rval
->constant_expression_value();
3695 YYLTYPE loc
= this->test_value
->get_location();
3697 _mesa_glsl_error(& loc
, state
,
3698 "switch statement case label must be a "
3699 "constant expression");
3701 /* Stuff a dummy value in to allow processing to continue. */
3702 label_const
= new(ctx
) ir_constant(0);
3704 ast_expression
*previous_label
= (ast_expression
*)
3705 hash_table_find(state
->switch_state
.labels_ht
,
3706 (void *)(uintptr_t)label_const
->value
.u
[0]);
3708 if (previous_label
) {
3709 YYLTYPE loc
= this->test_value
->get_location();
3710 _mesa_glsl_error(& loc
, state
,
3711 "duplicate case value");
3713 loc
= previous_label
->get_location();
3714 _mesa_glsl_error(& loc
, state
,
3715 "this is the previous case label");
3717 hash_table_insert(state
->switch_state
.labels_ht
,
3719 (void *)(uintptr_t)label_const
->value
.u
[0]);
3723 ir_dereference_variable
*deref_test_var
=
3724 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
3726 ir_rvalue
*const test_cond
= new(ctx
) ir_expression(ir_binop_all_equal
,
3730 ir_assignment
*set_fallthru_on_test
=
3731 new(ctx
) ir_assignment(deref_fallthru_var
,
3735 instructions
->push_tail(set_fallthru_on_test
);
3736 } else { /* default case */
3737 if (state
->switch_state
.previous_default
) {
3738 YYLTYPE loc
= this->get_location();
3739 _mesa_glsl_error(& loc
, state
,
3740 "multiple default labels in one switch");
3742 loc
= state
->switch_state
.previous_default
->get_location();
3743 _mesa_glsl_error(& loc
, state
,
3744 "this is the first default label");
3746 state
->switch_state
.previous_default
= this;
3748 /* Set falltrhu state. */
3749 ir_assignment
*set_fallthru
=
3750 new(ctx
) ir_assignment(deref_fallthru_var
, true_val
, NULL
);
3752 instructions
->push_tail(set_fallthru
);
3755 /* Case statements do not have r-values. */
3760 ast_iteration_statement::condition_to_hir(ir_loop
*stmt
,
3761 struct _mesa_glsl_parse_state
*state
)
3765 if (condition
!= NULL
) {
3766 ir_rvalue
*const cond
=
3767 condition
->hir(& stmt
->body_instructions
, state
);
3770 || !cond
->type
->is_boolean() || !cond
->type
->is_scalar()) {
3771 YYLTYPE loc
= condition
->get_location();
3773 _mesa_glsl_error(& loc
, state
,
3774 "loop condition must be scalar boolean");
3776 /* As the first code in the loop body, generate a block that looks
3777 * like 'if (!condition) break;' as the loop termination condition.
3779 ir_rvalue
*const not_cond
=
3780 new(ctx
) ir_expression(ir_unop_logic_not
, cond
);
3782 ir_if
*const if_stmt
= new(ctx
) ir_if(not_cond
);
3784 ir_jump
*const break_stmt
=
3785 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
3787 if_stmt
->then_instructions
.push_tail(break_stmt
);
3788 stmt
->body_instructions
.push_tail(if_stmt
);
3795 ast_iteration_statement::hir(exec_list
*instructions
,
3796 struct _mesa_glsl_parse_state
*state
)
3800 /* For-loops and while-loops start a new scope, but do-while loops do not.
3802 if (mode
!= ast_do_while
)
3803 state
->symbols
->push_scope();
3805 if (init_statement
!= NULL
)
3806 init_statement
->hir(instructions
, state
);
3808 ir_loop
*const stmt
= new(ctx
) ir_loop();
3809 instructions
->push_tail(stmt
);
3811 /* Track the current loop nesting. */
3812 ast_iteration_statement
*nesting_ast
= state
->loop_nesting_ast
;
3814 state
->loop_nesting_ast
= this;
3816 /* Likewise, indicate that following code is closest to a loop,
3817 * NOT closest to a switch.
3819 bool saved_is_switch_innermost
= state
->switch_state
.is_switch_innermost
;
3820 state
->switch_state
.is_switch_innermost
= false;
3822 if (mode
!= ast_do_while
)
3823 condition_to_hir(stmt
, state
);
3826 body
->hir(& stmt
->body_instructions
, state
);
3828 if (rest_expression
!= NULL
)
3829 rest_expression
->hir(& stmt
->body_instructions
, state
);
3831 if (mode
== ast_do_while
)
3832 condition_to_hir(stmt
, state
);
3834 if (mode
!= ast_do_while
)
3835 state
->symbols
->pop_scope();
3837 /* Restore previous nesting before returning. */
3838 state
->loop_nesting_ast
= nesting_ast
;
3839 state
->switch_state
.is_switch_innermost
= saved_is_switch_innermost
;
3841 /* Loops do not have r-values.
3848 ast_type_specifier::hir(exec_list
*instructions
,
3849 struct _mesa_glsl_parse_state
*state
)
3851 if (!this->is_precision_statement
&& this->structure
== NULL
)
3854 YYLTYPE loc
= this->get_location();
3856 if (this->precision
!= ast_precision_none
3857 && state
->language_version
!= 100
3858 && state
->language_version
< 130) {
3859 _mesa_glsl_error(&loc
, state
,
3860 "precision qualifiers exist only in "
3861 "GLSL ES 1.00, and GLSL 1.30 and later");
3864 if (this->precision
!= ast_precision_none
3865 && this->structure
!= NULL
) {
3866 _mesa_glsl_error(&loc
, state
,
3867 "precision qualifiers do not apply to structures");
3871 /* If this is a precision statement, check that the type to which it is
3872 * applied is either float or int.
3874 * From section 4.5.3 of the GLSL 1.30 spec:
3875 * "The precision statement
3876 * precision precision-qualifier type;
3877 * can be used to establish a default precision qualifier. The type
3878 * field can be either int or float [...]. Any other types or
3879 * qualifiers will result in an error.
3881 if (this->is_precision_statement
) {
3882 assert(this->precision
!= ast_precision_none
);
3883 assert(this->structure
== NULL
); /* The check for structures was
3884 * performed above. */
3885 if (this->is_array
) {
3886 _mesa_glsl_error(&loc
, state
,
3887 "default precision statements do not apply to "
3891 if (this->type_specifier
!= ast_float
3892 && this->type_specifier
!= ast_int
) {
3893 _mesa_glsl_error(&loc
, state
,
3894 "default precision statements apply only to types "
3899 /* FINISHME: Translate precision statements into IR. */
3903 if (this->structure
!= NULL
)
3904 return this->structure
->hir(instructions
, state
);
3911 ast_struct_specifier::hir(exec_list
*instructions
,
3912 struct _mesa_glsl_parse_state
*state
)
3914 unsigned decl_count
= 0;
3916 /* Make an initial pass over the list of structure fields to determine how
3917 * many there are. Each element in this list is an ast_declarator_list.
3918 * This means that we actually need to count the number of elements in the
3919 * 'declarations' list in each of the elements.
3921 foreach_list_typed (ast_declarator_list
, decl_list
, link
,
3922 &this->declarations
) {
3923 foreach_list_const (decl_ptr
, & decl_list
->declarations
) {
3928 /* Allocate storage for the structure fields and process the field
3929 * declarations. As the declarations are processed, try to also convert
3930 * the types to HIR. This ensures that structure definitions embedded in
3931 * other structure definitions are processed.
3933 glsl_struct_field
*const fields
= ralloc_array(state
, glsl_struct_field
,
3937 foreach_list_typed (ast_declarator_list
, decl_list
, link
,
3938 &this->declarations
) {
3939 const char *type_name
;
3941 decl_list
->type
->specifier
->hir(instructions
, state
);
3943 /* Section 10.9 of the GLSL ES 1.00 specification states that
3944 * embedded structure definitions have been removed from the language.
3946 if (state
->es_shader
&& decl_list
->type
->specifier
->structure
!= NULL
) {
3947 YYLTYPE loc
= this->get_location();
3948 _mesa_glsl_error(&loc
, state
, "Embedded structure definitions are "
3949 "not allowed in GLSL ES 1.00.");
3952 const glsl_type
*decl_type
=
3953 decl_list
->type
->specifier
->glsl_type(& type_name
, state
);
3955 foreach_list_typed (ast_declaration
, decl
, link
,
3956 &decl_list
->declarations
) {
3957 const struct glsl_type
*field_type
= decl_type
;
3958 if (decl
->is_array
) {
3959 YYLTYPE loc
= decl
->get_location();
3960 field_type
= process_array_type(&loc
, decl_type
, decl
->array_size
,
3963 fields
[i
].type
= (field_type
!= NULL
)
3964 ? field_type
: glsl_type::error_type
;
3965 fields
[i
].name
= decl
->identifier
;
3970 assert(i
== decl_count
);
3972 const glsl_type
*t
=
3973 glsl_type::get_record_instance(fields
, decl_count
, this->name
);
3975 YYLTYPE loc
= this->get_location();
3976 if (!state
->symbols
->add_type(name
, t
)) {
3977 _mesa_glsl_error(& loc
, state
, "struct `%s' previously defined", name
);
3979 const glsl_type
**s
= reralloc(state
, state
->user_structures
,
3981 state
->num_user_structures
+ 1);
3983 s
[state
->num_user_structures
] = t
;
3984 state
->user_structures
= s
;
3985 state
->num_user_structures
++;
3989 /* Structure type definitions do not have r-values.