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"
60 _mesa_ast_to_hir(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
)
62 _mesa_glsl_initialize_variables(instructions
, state
);
63 _mesa_glsl_initialize_functions(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 ir_rvalue
*lhs
, ir_rvalue
*rhs
, bool is_initializer
,
672 bool error_emitted
= (lhs
->type
->is_error() || rhs
->type
->is_error());
674 if (!error_emitted
) {
675 if (lhs
->variable_referenced() != NULL
676 && lhs
->variable_referenced()->read_only
) {
677 _mesa_glsl_error(&lhs_loc
, state
,
678 "assignment to read-only variable '%s'",
679 lhs
->variable_referenced()->name
);
680 error_emitted
= true;
682 } else if (state
->language_version
<= 110 && lhs
->type
->is_array()) {
683 /* From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
685 * "Other binary or unary expressions, non-dereferenced
686 * arrays, function names, swizzles with repeated fields,
687 * and constants cannot be l-values."
689 _mesa_glsl_error(&lhs_loc
, state
, "whole array assignment is not "
690 "allowed in GLSL 1.10 or GLSL ES 1.00.");
691 error_emitted
= true;
692 } else if (!lhs
->is_lvalue()) {
693 _mesa_glsl_error(& lhs_loc
, state
, "non-lvalue in assignment");
694 error_emitted
= true;
699 validate_assignment(state
, lhs
->type
, rhs
, is_initializer
);
700 if (new_rhs
== NULL
) {
701 _mesa_glsl_error(& lhs_loc
, state
, "type mismatch");
705 /* If the LHS array was not declared with a size, it takes it size from
706 * the RHS. If the LHS is an l-value and a whole array, it must be a
707 * dereference of a variable. Any other case would require that the LHS
708 * is either not an l-value or not a whole array.
710 if (lhs
->type
->array_size() == 0) {
711 ir_dereference
*const d
= lhs
->as_dereference();
715 ir_variable
*const var
= d
->variable_referenced();
719 if (var
->max_array_access
>= unsigned(rhs
->type
->array_size())) {
720 /* FINISHME: This should actually log the location of the RHS. */
721 _mesa_glsl_error(& lhs_loc
, state
, "array size must be > %u due to "
723 var
->max_array_access
);
726 var
->type
= glsl_type::get_array_instance(lhs
->type
->element_type(),
727 rhs
->type
->array_size());
730 mark_whole_array_access(rhs
);
731 mark_whole_array_access(lhs
);
734 /* Most callers of do_assignment (assign, add_assign, pre_inc/dec,
735 * but not post_inc) need the converted assigned value as an rvalue
736 * to handle things like:
740 * So we always just store the computed value being assigned to a
741 * temporary and return a deref of that temporary. If the rvalue
742 * ends up not being used, the temp will get copy-propagated out.
744 ir_variable
*var
= new(ctx
) ir_variable(rhs
->type
, "assignment_tmp",
746 ir_dereference_variable
*deref_var
= new(ctx
) ir_dereference_variable(var
);
747 instructions
->push_tail(var
);
748 instructions
->push_tail(new(ctx
) ir_assignment(deref_var
,
751 deref_var
= new(ctx
) ir_dereference_variable(var
);
754 instructions
->push_tail(new(ctx
) ir_assignment(lhs
, deref_var
, NULL
));
756 return new(ctx
) ir_dereference_variable(var
);
760 get_lvalue_copy(exec_list
*instructions
, ir_rvalue
*lvalue
)
762 void *ctx
= ralloc_parent(lvalue
);
765 var
= new(ctx
) ir_variable(lvalue
->type
, "_post_incdec_tmp",
767 instructions
->push_tail(var
);
768 var
->mode
= ir_var_auto
;
770 instructions
->push_tail(new(ctx
) ir_assignment(new(ctx
) ir_dereference_variable(var
),
773 /* Once we've created this temporary, mark it read only so it's no
774 * longer considered an lvalue.
776 var
->read_only
= true;
778 return new(ctx
) ir_dereference_variable(var
);
783 ast_node::hir(exec_list
*instructions
,
784 struct _mesa_glsl_parse_state
*state
)
793 do_comparison(void *mem_ctx
, int operation
, ir_rvalue
*op0
, ir_rvalue
*op1
)
796 ir_rvalue
*cmp
= NULL
;
798 if (operation
== ir_binop_all_equal
)
799 join_op
= ir_binop_logic_and
;
801 join_op
= ir_binop_logic_or
;
803 switch (op0
->type
->base_type
) {
804 case GLSL_TYPE_FLOAT
:
808 return new(mem_ctx
) ir_expression(operation
, op0
, op1
);
810 case GLSL_TYPE_ARRAY
: {
811 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
812 ir_rvalue
*e0
, *e1
, *result
;
814 e0
= new(mem_ctx
) ir_dereference_array(op0
->clone(mem_ctx
, NULL
),
815 new(mem_ctx
) ir_constant(i
));
816 e1
= new(mem_ctx
) ir_dereference_array(op1
->clone(mem_ctx
, NULL
),
817 new(mem_ctx
) ir_constant(i
));
818 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
821 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
827 mark_whole_array_access(op0
);
828 mark_whole_array_access(op1
);
832 case GLSL_TYPE_STRUCT
: {
833 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
834 ir_rvalue
*e0
, *e1
, *result
;
835 const char *field_name
= op0
->type
->fields
.structure
[i
].name
;
837 e0
= new(mem_ctx
) ir_dereference_record(op0
->clone(mem_ctx
, NULL
),
839 e1
= new(mem_ctx
) ir_dereference_record(op1
->clone(mem_ctx
, NULL
),
841 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
844 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
852 case GLSL_TYPE_ERROR
:
854 case GLSL_TYPE_SAMPLER
:
855 /* I assume a comparison of a struct containing a sampler just
856 * ignores the sampler present in the type.
861 assert(!"Should not get here.");
866 cmp
= new(mem_ctx
) ir_constant(true);
871 /* For logical operations, we want to ensure that the operands are
872 * scalar booleans. If it isn't, emit an error and return a constant
873 * boolean to avoid triggering cascading error messages.
876 get_scalar_boolean_operand(exec_list
*instructions
,
877 struct _mesa_glsl_parse_state
*state
,
878 ast_expression
*parent_expr
,
880 const char *operand_name
,
883 ast_expression
*expr
= parent_expr
->subexpressions
[operand
];
885 ir_rvalue
*val
= expr
->hir(instructions
, state
);
887 if (val
->type
->is_boolean() && val
->type
->is_scalar())
890 if (!*error_emitted
) {
891 YYLTYPE loc
= expr
->get_location();
892 _mesa_glsl_error(&loc
, state
, "%s of `%s' must be scalar boolean",
894 parent_expr
->operator_string(parent_expr
->oper
));
895 *error_emitted
= true;
898 return new(ctx
) ir_constant(true);
902 * If name refers to a builtin array whose maximum allowed size is less than
903 * size, report an error and return true. Otherwise return false.
906 check_builtin_array_max_size(const char *name
, unsigned size
,
907 YYLTYPE loc
, struct _mesa_glsl_parse_state
*state
)
909 if ((strcmp("gl_TexCoord", name
) == 0)
910 && (size
> state
->Const
.MaxTextureCoords
)) {
911 /* From page 54 (page 60 of the PDF) of the GLSL 1.20 spec:
913 * "The size [of gl_TexCoord] can be at most
914 * gl_MaxTextureCoords."
916 _mesa_glsl_error(&loc
, state
, "`gl_TexCoord' array size cannot "
917 "be larger than gl_MaxTextureCoords (%u)\n",
918 state
->Const
.MaxTextureCoords
);
920 } else if (strcmp("gl_ClipDistance", name
) == 0
921 && size
> state
->Const
.MaxClipPlanes
) {
922 /* From section 7.1 (Vertex Shader Special Variables) of the
925 * "The gl_ClipDistance array is predeclared as unsized and
926 * must be sized by the shader either redeclaring it with a
927 * size or indexing it only with integral constant
928 * expressions. ... The size can be at most
929 * gl_MaxClipDistances."
931 _mesa_glsl_error(&loc
, state
, "`gl_ClipDistance' array size cannot "
932 "be larger than gl_MaxClipDistances (%u)\n",
933 state
->Const
.MaxClipPlanes
);
940 ast_expression::hir(exec_list
*instructions
,
941 struct _mesa_glsl_parse_state
*state
)
944 static const int operations
[AST_NUM_OPERATORS
] = {
945 -1, /* ast_assign doesn't convert to ir_expression. */
946 -1, /* ast_plus doesn't convert to ir_expression. */
970 /* Note: The following block of expression types actually convert
971 * to multiple IR instructions.
973 ir_binop_mul
, /* ast_mul_assign */
974 ir_binop_div
, /* ast_div_assign */
975 ir_binop_mod
, /* ast_mod_assign */
976 ir_binop_add
, /* ast_add_assign */
977 ir_binop_sub
, /* ast_sub_assign */
978 ir_binop_lshift
, /* ast_ls_assign */
979 ir_binop_rshift
, /* ast_rs_assign */
980 ir_binop_bit_and
, /* ast_and_assign */
981 ir_binop_bit_xor
, /* ast_xor_assign */
982 ir_binop_bit_or
, /* ast_or_assign */
984 -1, /* ast_conditional doesn't convert to ir_expression. */
985 ir_binop_add
, /* ast_pre_inc. */
986 ir_binop_sub
, /* ast_pre_dec. */
987 ir_binop_add
, /* ast_post_inc. */
988 ir_binop_sub
, /* ast_post_dec. */
989 -1, /* ast_field_selection doesn't conv to ir_expression. */
990 -1, /* ast_array_index doesn't convert to ir_expression. */
991 -1, /* ast_function_call doesn't conv to ir_expression. */
992 -1, /* ast_identifier doesn't convert to ir_expression. */
993 -1, /* ast_int_constant doesn't convert to ir_expression. */
994 -1, /* ast_uint_constant doesn't conv to ir_expression. */
995 -1, /* ast_float_constant doesn't conv to ir_expression. */
996 -1, /* ast_bool_constant doesn't conv to ir_expression. */
997 -1, /* ast_sequence doesn't convert to ir_expression. */
999 ir_rvalue
*result
= NULL
;
1001 const struct glsl_type
*type
; /* a temporary variable for switch cases */
1002 bool error_emitted
= false;
1005 loc
= this->get_location();
1007 switch (this->oper
) {
1009 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1010 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1012 result
= do_assignment(instructions
, state
, op
[0], op
[1], false,
1013 this->subexpressions
[0]->get_location());
1014 error_emitted
= result
->type
->is_error();
1019 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1021 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1023 error_emitted
= type
->is_error();
1029 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1031 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1033 error_emitted
= type
->is_error();
1035 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1043 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1044 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1046 type
= arithmetic_result_type(op
[0], op
[1],
1047 (this->oper
== ast_mul
),
1049 error_emitted
= type
->is_error();
1051 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1056 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1057 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1059 type
= modulus_result_type(op
[0]->type
, op
[1]->type
, state
, & loc
);
1061 assert(operations
[this->oper
] == ir_binop_mod
);
1063 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1065 error_emitted
= type
->is_error();
1070 if (state
->language_version
< 130) {
1071 _mesa_glsl_error(&loc
, state
, "operator %s requires GLSL 1.30",
1072 operator_string(this->oper
));
1073 error_emitted
= true;
1076 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1077 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1078 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1080 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1082 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1089 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1090 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1092 type
= relational_result_type(op
[0], op
[1], state
, & loc
);
1094 /* The relational operators must either generate an error or result
1095 * in a scalar boolean. See page 57 of the GLSL 1.50 spec.
1097 assert(type
->is_error()
1098 || ((type
->base_type
== GLSL_TYPE_BOOL
)
1099 && type
->is_scalar()));
1101 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1103 error_emitted
= type
->is_error();
1108 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1109 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1111 /* From page 58 (page 64 of the PDF) of the GLSL 1.50 spec:
1113 * "The equality operators equal (==), and not equal (!=)
1114 * operate on all types. They result in a scalar Boolean. If
1115 * the operand types do not match, then there must be a
1116 * conversion from Section 4.1.10 "Implicit Conversions"
1117 * applied to one operand that can make them match, in which
1118 * case this conversion is done."
1120 if ((!apply_implicit_conversion(op
[0]->type
, op
[1], state
)
1121 && !apply_implicit_conversion(op
[1]->type
, op
[0], state
))
1122 || (op
[0]->type
!= op
[1]->type
)) {
1123 _mesa_glsl_error(& loc
, state
, "operands of `%s' must have the same "
1124 "type", (this->oper
== ast_equal
) ? "==" : "!=");
1125 error_emitted
= true;
1126 } else if ((state
->language_version
<= 110)
1127 && (op
[0]->type
->is_array() || op
[1]->type
->is_array())) {
1128 _mesa_glsl_error(& loc
, state
, "array comparisons forbidden in "
1130 error_emitted
= true;
1133 if (error_emitted
) {
1134 result
= new(ctx
) ir_constant(false);
1136 result
= do_comparison(ctx
, operations
[this->oper
], op
[0], op
[1]);
1137 assert(result
->type
== glsl_type::bool_type
);
1144 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1145 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1146 type
= bit_logic_result_type(op
[0]->type
, op
[1]->type
, this->oper
,
1148 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1150 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1154 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1156 if (state
->language_version
< 130) {
1157 _mesa_glsl_error(&loc
, state
, "bit-wise operations require GLSL 1.30");
1158 error_emitted
= true;
1161 if (!op
[0]->type
->is_integer()) {
1162 _mesa_glsl_error(&loc
, state
, "operand of `~' must be an integer");
1163 error_emitted
= true;
1167 result
= new(ctx
) ir_expression(ir_unop_bit_not
, type
, op
[0], NULL
);
1170 case ast_logic_and
: {
1171 exec_list rhs_instructions
;
1172 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1173 "LHS", &error_emitted
);
1174 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1175 "RHS", &error_emitted
);
1177 ir_constant
*op0_const
= op
[0]->constant_expression_value();
1179 if (op0_const
->value
.b
[0]) {
1180 instructions
->append_list(&rhs_instructions
);
1185 type
= glsl_type::bool_type
;
1187 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1190 instructions
->push_tail(tmp
);
1192 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1193 instructions
->push_tail(stmt
);
1195 stmt
->then_instructions
.append_list(&rhs_instructions
);
1196 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1197 ir_assignment
*const then_assign
=
1198 new(ctx
) ir_assignment(then_deref
, op
[1], NULL
);
1199 stmt
->then_instructions
.push_tail(then_assign
);
1201 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1202 ir_assignment
*const else_assign
=
1203 new(ctx
) ir_assignment(else_deref
, new(ctx
) ir_constant(false), NULL
);
1204 stmt
->else_instructions
.push_tail(else_assign
);
1206 result
= new(ctx
) ir_dereference_variable(tmp
);
1212 case ast_logic_or
: {
1213 exec_list rhs_instructions
;
1214 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1215 "LHS", &error_emitted
);
1216 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1217 "RHS", &error_emitted
);
1219 ir_constant
*op0_const
= op
[0]->constant_expression_value();
1221 if (op0_const
->value
.b
[0]) {
1226 type
= glsl_type::bool_type
;
1228 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1231 instructions
->push_tail(tmp
);
1233 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1234 instructions
->push_tail(stmt
);
1236 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1237 ir_assignment
*const then_assign
=
1238 new(ctx
) ir_assignment(then_deref
, new(ctx
) ir_constant(true), NULL
);
1239 stmt
->then_instructions
.push_tail(then_assign
);
1241 stmt
->else_instructions
.append_list(&rhs_instructions
);
1242 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1243 ir_assignment
*const else_assign
=
1244 new(ctx
) ir_assignment(else_deref
, op
[1], NULL
);
1245 stmt
->else_instructions
.push_tail(else_assign
);
1247 result
= new(ctx
) ir_dereference_variable(tmp
);
1254 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1256 * "The logical binary operators and (&&), or ( | | ), and
1257 * exclusive or (^^). They operate only on two Boolean
1258 * expressions and result in a Boolean expression."
1260 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0, "LHS",
1262 op
[1] = get_scalar_boolean_operand(instructions
, state
, this, 1, "RHS",
1265 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1270 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1271 "operand", &error_emitted
);
1273 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1277 case ast_mul_assign
:
1278 case ast_div_assign
:
1279 case ast_add_assign
:
1280 case ast_sub_assign
: {
1281 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1282 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1284 type
= arithmetic_result_type(op
[0], op
[1],
1285 (this->oper
== ast_mul_assign
),
1288 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1291 result
= do_assignment(instructions
, state
,
1292 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1293 this->subexpressions
[0]->get_location());
1294 error_emitted
= (op
[0]->type
->is_error());
1296 /* GLSL 1.10 does not allow array assignment. However, we don't have to
1297 * explicitly test for this because none of the binary expression
1298 * operators allow array operands either.
1304 case ast_mod_assign
: {
1305 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1306 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1308 type
= modulus_result_type(op
[0]->type
, op
[1]->type
, state
, & loc
);
1310 assert(operations
[this->oper
] == ir_binop_mod
);
1312 ir_rvalue
*temp_rhs
;
1313 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1316 result
= do_assignment(instructions
, state
,
1317 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1318 this->subexpressions
[0]->get_location());
1319 error_emitted
= type
->is_error();
1324 case ast_rs_assign
: {
1325 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1326 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1327 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1329 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1330 type
, op
[0], op
[1]);
1331 result
= do_assignment(instructions
, state
, op
[0]->clone(ctx
, NULL
),
1333 this->subexpressions
[0]->get_location());
1334 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1338 case ast_and_assign
:
1339 case ast_xor_assign
:
1340 case ast_or_assign
: {
1341 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1342 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1343 type
= bit_logic_result_type(op
[0]->type
, op
[1]->type
, this->oper
,
1345 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1346 type
, op
[0], op
[1]);
1347 result
= do_assignment(instructions
, state
, op
[0]->clone(ctx
, NULL
),
1349 this->subexpressions
[0]->get_location());
1350 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1354 case ast_conditional
: {
1355 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1357 * "The ternary selection operator (?:). It operates on three
1358 * expressions (exp1 ? exp2 : exp3). This operator evaluates the
1359 * first expression, which must result in a scalar Boolean."
1361 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1362 "condition", &error_emitted
);
1364 /* The :? operator is implemented by generating an anonymous temporary
1365 * followed by an if-statement. The last instruction in each branch of
1366 * the if-statement assigns a value to the anonymous temporary. This
1367 * temporary is the r-value of the expression.
1369 exec_list then_instructions
;
1370 exec_list else_instructions
;
1372 op
[1] = this->subexpressions
[1]->hir(&then_instructions
, state
);
1373 op
[2] = this->subexpressions
[2]->hir(&else_instructions
, state
);
1375 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1377 * "The second and third expressions can be any type, as
1378 * long their types match, or there is a conversion in
1379 * Section 4.1.10 "Implicit Conversions" that can be applied
1380 * to one of the expressions to make their types match. This
1381 * resulting matching type is the type of the entire
1384 if ((!apply_implicit_conversion(op
[1]->type
, op
[2], state
)
1385 && !apply_implicit_conversion(op
[2]->type
, op
[1], state
))
1386 || (op
[1]->type
!= op
[2]->type
)) {
1387 YYLTYPE loc
= this->subexpressions
[1]->get_location();
1389 _mesa_glsl_error(& loc
, state
, "Second and third operands of ?: "
1390 "operator must have matching types.");
1391 error_emitted
= true;
1392 type
= glsl_type::error_type
;
1397 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1399 * "The second and third expressions must be the same type, but can
1400 * be of any type other than an array."
1402 if ((state
->language_version
<= 110) && type
->is_array()) {
1403 _mesa_glsl_error(& loc
, state
, "Second and third operands of ?: "
1404 "operator must not be arrays.");
1405 error_emitted
= true;
1408 ir_constant
*cond_val
= op
[0]->constant_expression_value();
1409 ir_constant
*then_val
= op
[1]->constant_expression_value();
1410 ir_constant
*else_val
= op
[2]->constant_expression_value();
1412 if (then_instructions
.is_empty()
1413 && else_instructions
.is_empty()
1414 && (cond_val
!= NULL
) && (then_val
!= NULL
) && (else_val
!= NULL
)) {
1415 result
= (cond_val
->value
.b
[0]) ? then_val
: else_val
;
1417 ir_variable
*const tmp
=
1418 new(ctx
) ir_variable(type
, "conditional_tmp", ir_var_temporary
);
1419 instructions
->push_tail(tmp
);
1421 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1422 instructions
->push_tail(stmt
);
1424 then_instructions
.move_nodes_to(& stmt
->then_instructions
);
1425 ir_dereference
*const then_deref
=
1426 new(ctx
) ir_dereference_variable(tmp
);
1427 ir_assignment
*const then_assign
=
1428 new(ctx
) ir_assignment(then_deref
, op
[1], NULL
);
1429 stmt
->then_instructions
.push_tail(then_assign
);
1431 else_instructions
.move_nodes_to(& stmt
->else_instructions
);
1432 ir_dereference
*const else_deref
=
1433 new(ctx
) ir_dereference_variable(tmp
);
1434 ir_assignment
*const else_assign
=
1435 new(ctx
) ir_assignment(else_deref
, op
[2], NULL
);
1436 stmt
->else_instructions
.push_tail(else_assign
);
1438 result
= new(ctx
) ir_dereference_variable(tmp
);
1445 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1446 if (op
[0]->type
->base_type
== GLSL_TYPE_FLOAT
)
1447 op
[1] = new(ctx
) ir_constant(1.0f
);
1449 op
[1] = new(ctx
) ir_constant(1);
1451 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1453 ir_rvalue
*temp_rhs
;
1454 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1457 result
= do_assignment(instructions
, state
,
1458 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1459 this->subexpressions
[0]->get_location());
1460 error_emitted
= op
[0]->type
->is_error();
1465 case ast_post_dec
: {
1466 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1467 if (op
[0]->type
->base_type
== GLSL_TYPE_FLOAT
)
1468 op
[1] = new(ctx
) ir_constant(1.0f
);
1470 op
[1] = new(ctx
) ir_constant(1);
1472 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1474 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1476 ir_rvalue
*temp_rhs
;
1477 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1480 /* Get a temporary of a copy of the lvalue before it's modified.
1481 * This may get thrown away later.
1483 result
= get_lvalue_copy(instructions
, op
[0]->clone(ctx
, NULL
));
1485 (void)do_assignment(instructions
, state
,
1486 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1487 this->subexpressions
[0]->get_location());
1489 error_emitted
= op
[0]->type
->is_error();
1493 case ast_field_selection
:
1494 result
= _mesa_ast_field_selection_to_hir(this, instructions
, state
);
1497 case ast_array_index
: {
1498 YYLTYPE index_loc
= subexpressions
[1]->get_location();
1500 op
[0] = subexpressions
[0]->hir(instructions
, state
);
1501 op
[1] = subexpressions
[1]->hir(instructions
, state
);
1503 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1505 ir_rvalue
*const array
= op
[0];
1507 result
= new(ctx
) ir_dereference_array(op
[0], op
[1]);
1509 /* Do not use op[0] after this point. Use array.
1517 if (!array
->type
->is_array()
1518 && !array
->type
->is_matrix()
1519 && !array
->type
->is_vector()) {
1520 _mesa_glsl_error(& index_loc
, state
,
1521 "cannot dereference non-array / non-matrix / "
1523 error_emitted
= true;
1526 if (!op
[1]->type
->is_integer()) {
1527 _mesa_glsl_error(& index_loc
, state
,
1528 "array index must be integer type");
1529 error_emitted
= true;
1530 } else if (!op
[1]->type
->is_scalar()) {
1531 _mesa_glsl_error(& index_loc
, state
,
1532 "array index must be scalar");
1533 error_emitted
= true;
1536 /* If the array index is a constant expression and the array has a
1537 * declared size, ensure that the access is in-bounds. If the array
1538 * index is not a constant expression, ensure that the array has a
1541 ir_constant
*const const_index
= op
[1]->constant_expression_value();
1542 if (const_index
!= NULL
) {
1543 const int idx
= const_index
->value
.i
[0];
1544 const char *type_name
;
1547 if (array
->type
->is_matrix()) {
1548 type_name
= "matrix";
1549 } else if (array
->type
->is_vector()) {
1550 type_name
= "vector";
1552 type_name
= "array";
1555 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec:
1557 * "It is illegal to declare an array with a size, and then
1558 * later (in the same shader) index the same array with an
1559 * integral constant expression greater than or equal to the
1560 * declared size. It is also illegal to index an array with a
1561 * negative constant expression."
1563 if (array
->type
->is_matrix()) {
1564 if (array
->type
->row_type()->vector_elements
<= idx
) {
1565 bound
= array
->type
->row_type()->vector_elements
;
1567 } else if (array
->type
->is_vector()) {
1568 if (array
->type
->vector_elements
<= idx
) {
1569 bound
= array
->type
->vector_elements
;
1572 if ((array
->type
->array_size() > 0)
1573 && (array
->type
->array_size() <= idx
)) {
1574 bound
= array
->type
->array_size();
1579 _mesa_glsl_error(& loc
, state
, "%s index must be < %u",
1581 error_emitted
= true;
1582 } else if (idx
< 0) {
1583 _mesa_glsl_error(& loc
, state
, "%s index must be >= 0",
1585 error_emitted
= true;
1588 if (array
->type
->is_array()) {
1589 /* If the array is a variable dereference, it dereferences the
1590 * whole array, by definition. Use this to get the variable.
1592 * FINISHME: Should some methods for getting / setting / testing
1593 * FINISHME: array access limits be added to ir_dereference?
1595 ir_variable
*const v
= array
->whole_variable_referenced();
1596 if ((v
!= NULL
) && (unsigned(idx
) > v
->max_array_access
)) {
1597 v
->max_array_access
= idx
;
1599 /* Check whether this access will, as a side effect, implicitly
1600 * cause the size of a built-in array to be too large.
1602 if (check_builtin_array_max_size(v
->name
, idx
+1, loc
, state
))
1603 error_emitted
= true;
1606 } else if (array
->type
->array_size() == 0) {
1607 _mesa_glsl_error(&loc
, state
, "unsized array index must be constant");
1609 if (array
->type
->is_array()) {
1610 /* whole_variable_referenced can return NULL if the array is a
1611 * member of a structure. In this case it is safe to not update
1612 * the max_array_access field because it is never used for fields
1615 ir_variable
*v
= array
->whole_variable_referenced();
1617 v
->max_array_access
= array
->type
->array_size() - 1;
1621 /* From page 23 (29 of the PDF) of the GLSL 1.30 spec:
1623 * "Samplers aggregated into arrays within a shader (using square
1624 * brackets [ ]) can only be indexed with integral constant
1625 * expressions [...]."
1627 * This restriction was added in GLSL 1.30. Shaders using earlier version
1628 * of the language should not be rejected by the compiler front-end for
1629 * using this construct. This allows useful things such as using a loop
1630 * counter as the index to an array of samplers. If the loop in unrolled,
1631 * the code should compile correctly. Instead, emit a warning.
1633 if (array
->type
->is_array() &&
1634 array
->type
->element_type()->is_sampler() &&
1635 const_index
== NULL
) {
1637 if (state
->language_version
== 100) {
1638 _mesa_glsl_warning(&loc
, state
,
1639 "sampler arrays indexed with non-constant "
1640 "expressions is optional in GLSL ES 1.00");
1641 } else if (state
->language_version
< 130) {
1642 _mesa_glsl_warning(&loc
, state
,
1643 "sampler arrays indexed with non-constant "
1644 "expressions is forbidden in GLSL 1.30 and "
1647 _mesa_glsl_error(&loc
, state
,
1648 "sampler arrays indexed with non-constant "
1649 "expressions is forbidden in GLSL 1.30 and "
1651 error_emitted
= true;
1656 result
->type
= glsl_type::error_type
;
1661 case ast_function_call
:
1662 /* Should *NEVER* get here. ast_function_call should always be handled
1663 * by ast_function_expression::hir.
1668 case ast_identifier
: {
1669 /* ast_identifier can appear several places in a full abstract syntax
1670 * tree. This particular use must be at location specified in the grammar
1671 * as 'variable_identifier'.
1674 state
->symbols
->get_variable(this->primary_expression
.identifier
);
1676 result
= new(ctx
) ir_dereference_variable(var
);
1681 _mesa_glsl_error(& loc
, state
, "`%s' undeclared",
1682 this->primary_expression
.identifier
);
1684 error_emitted
= true;
1689 case ast_int_constant
:
1690 result
= new(ctx
) ir_constant(this->primary_expression
.int_constant
);
1693 case ast_uint_constant
:
1694 result
= new(ctx
) ir_constant(this->primary_expression
.uint_constant
);
1697 case ast_float_constant
:
1698 result
= new(ctx
) ir_constant(this->primary_expression
.float_constant
);
1701 case ast_bool_constant
:
1702 result
= new(ctx
) ir_constant(bool(this->primary_expression
.bool_constant
));
1705 case ast_sequence
: {
1706 /* It should not be possible to generate a sequence in the AST without
1707 * any expressions in it.
1709 assert(!this->expressions
.is_empty());
1711 /* The r-value of a sequence is the last expression in the sequence. If
1712 * the other expressions in the sequence do not have side-effects (and
1713 * therefore add instructions to the instruction list), they get dropped
1716 exec_node
*previous_tail_pred
= NULL
;
1717 YYLTYPE previous_operand_loc
= loc
;
1719 foreach_list_typed (ast_node
, ast
, link
, &this->expressions
) {
1720 /* If one of the operands of comma operator does not generate any
1721 * code, we want to emit a warning. At each pass through the loop
1722 * previous_tail_pred will point to the last instruction in the
1723 * stream *before* processing the previous operand. Naturally,
1724 * instructions->tail_pred will point to the last instruction in the
1725 * stream *after* processing the previous operand. If the two
1726 * pointers match, then the previous operand had no effect.
1728 * The warning behavior here differs slightly from GCC. GCC will
1729 * only emit a warning if none of the left-hand operands have an
1730 * effect. However, it will emit a warning for each. I believe that
1731 * there are some cases in C (especially with GCC extensions) where
1732 * it is useful to have an intermediate step in a sequence have no
1733 * effect, but I don't think these cases exist in GLSL. Either way,
1734 * it would be a giant hassle to replicate that behavior.
1736 if (previous_tail_pred
== instructions
->tail_pred
) {
1737 _mesa_glsl_warning(&previous_operand_loc
, state
,
1738 "left-hand operand of comma expression has "
1742 /* tail_pred is directly accessed instead of using the get_tail()
1743 * method for performance reasons. get_tail() has extra code to
1744 * return NULL when the list is empty. We don't care about that
1745 * here, so using tail_pred directly is fine.
1747 previous_tail_pred
= instructions
->tail_pred
;
1748 previous_operand_loc
= ast
->get_location();
1750 result
= ast
->hir(instructions
, state
);
1753 /* Any errors should have already been emitted in the loop above.
1755 error_emitted
= true;
1759 type
= NULL
; /* use result->type, not type. */
1760 assert(result
!= NULL
);
1762 if (result
->type
->is_error() && !error_emitted
)
1763 _mesa_glsl_error(& loc
, state
, "type mismatch");
1770 ast_expression_statement::hir(exec_list
*instructions
,
1771 struct _mesa_glsl_parse_state
*state
)
1773 /* It is possible to have expression statements that don't have an
1774 * expression. This is the solitary semicolon:
1776 * for (i = 0; i < 5; i++)
1779 * In this case the expression will be NULL. Test for NULL and don't do
1780 * anything in that case.
1782 if (expression
!= NULL
)
1783 expression
->hir(instructions
, state
);
1785 /* Statements do not have r-values.
1792 ast_compound_statement::hir(exec_list
*instructions
,
1793 struct _mesa_glsl_parse_state
*state
)
1796 state
->symbols
->push_scope();
1798 foreach_list_typed (ast_node
, ast
, link
, &this->statements
)
1799 ast
->hir(instructions
, state
);
1802 state
->symbols
->pop_scope();
1804 /* Compound statements do not have r-values.
1810 static const glsl_type
*
1811 process_array_type(YYLTYPE
*loc
, const glsl_type
*base
, ast_node
*array_size
,
1812 struct _mesa_glsl_parse_state
*state
)
1814 unsigned length
= 0;
1816 /* FINISHME: Reject delcarations of multidimensional arrays. */
1818 if (array_size
!= NULL
) {
1819 exec_list dummy_instructions
;
1820 ir_rvalue
*const ir
= array_size
->hir(& dummy_instructions
, state
);
1821 YYLTYPE loc
= array_size
->get_location();
1824 if (!ir
->type
->is_integer()) {
1825 _mesa_glsl_error(& loc
, state
, "array size must be integer type");
1826 } else if (!ir
->type
->is_scalar()) {
1827 _mesa_glsl_error(& loc
, state
, "array size must be scalar type");
1829 ir_constant
*const size
= ir
->constant_expression_value();
1832 _mesa_glsl_error(& loc
, state
, "array size must be a "
1833 "constant valued expression");
1834 } else if (size
->value
.i
[0] <= 0) {
1835 _mesa_glsl_error(& loc
, state
, "array size must be > 0");
1837 assert(size
->type
== ir
->type
);
1838 length
= size
->value
.u
[0];
1840 /* If the array size is const (and we've verified that
1841 * it is) then no instructions should have been emitted
1842 * when we converted it to HIR. If they were emitted,
1843 * then either the array size isn't const after all, or
1844 * we are emitting unnecessary instructions.
1846 assert(dummy_instructions
.is_empty());
1850 } else if (state
->es_shader
) {
1851 /* Section 10.17 of the GLSL ES 1.00 specification states that unsized
1852 * array declarations have been removed from the language.
1854 _mesa_glsl_error(loc
, state
, "unsized array declarations are not "
1855 "allowed in GLSL ES 1.00.");
1858 return glsl_type::get_array_instance(base
, length
);
1863 ast_type_specifier::glsl_type(const char **name
,
1864 struct _mesa_glsl_parse_state
*state
) const
1866 const struct glsl_type
*type
;
1868 type
= state
->symbols
->get_type(this->type_name
);
1869 *name
= this->type_name
;
1871 if (this->is_array
) {
1872 YYLTYPE loc
= this->get_location();
1873 type
= process_array_type(&loc
, type
, this->array_size
, state
);
1881 apply_type_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
1883 struct _mesa_glsl_parse_state
*state
,
1886 if (qual
->flags
.q
.invariant
) {
1888 _mesa_glsl_error(loc
, state
,
1889 "variable `%s' may not be redeclared "
1890 "`invariant' after being used",
1897 if (qual
->flags
.q
.constant
|| qual
->flags
.q
.attribute
1898 || qual
->flags
.q
.uniform
1899 || (qual
->flags
.q
.varying
&& (state
->target
== fragment_shader
)))
1902 if (qual
->flags
.q
.centroid
)
1905 if (qual
->flags
.q
.attribute
&& state
->target
!= vertex_shader
) {
1906 var
->type
= glsl_type::error_type
;
1907 _mesa_glsl_error(loc
, state
,
1908 "`attribute' variables may not be declared in the "
1910 _mesa_glsl_shader_target_name(state
->target
));
1913 /* From page 25 (page 31 of the PDF) of the GLSL 1.10 spec:
1915 * "The varying qualifier can be used only with the data types
1916 * float, vec2, vec3, vec4, mat2, mat3, and mat4, or arrays of
1919 if (qual
->flags
.q
.varying
) {
1920 const glsl_type
*non_array_type
;
1922 if (var
->type
&& var
->type
->is_array())
1923 non_array_type
= var
->type
->fields
.array
;
1925 non_array_type
= var
->type
;
1927 if (non_array_type
&& non_array_type
->base_type
!= GLSL_TYPE_FLOAT
) {
1928 var
->type
= glsl_type::error_type
;
1929 _mesa_glsl_error(loc
, state
,
1930 "varying variables must be of base type float");
1934 /* If there is no qualifier that changes the mode of the variable, leave
1935 * the setting alone.
1937 if (qual
->flags
.q
.in
&& qual
->flags
.q
.out
)
1938 var
->mode
= ir_var_inout
;
1939 else if (qual
->flags
.q
.attribute
|| qual
->flags
.q
.in
1940 || (qual
->flags
.q
.varying
&& (state
->target
== fragment_shader
)))
1941 var
->mode
= ir_var_in
;
1942 else if (qual
->flags
.q
.out
1943 || (qual
->flags
.q
.varying
&& (state
->target
== vertex_shader
)))
1944 var
->mode
= ir_var_out
;
1945 else if (qual
->flags
.q
.uniform
)
1946 var
->mode
= ir_var_uniform
;
1948 if (state
->all_invariant
&& (state
->current_function
== NULL
)) {
1949 switch (state
->target
) {
1951 if (var
->mode
== ir_var_out
)
1952 var
->invariant
= true;
1954 case geometry_shader
:
1955 if ((var
->mode
== ir_var_in
) || (var
->mode
== ir_var_out
))
1956 var
->invariant
= true;
1958 case fragment_shader
:
1959 if (var
->mode
== ir_var_in
)
1960 var
->invariant
= true;
1965 if (qual
->flags
.q
.flat
)
1966 var
->interpolation
= ir_var_flat
;
1967 else if (qual
->flags
.q
.noperspective
)
1968 var
->interpolation
= ir_var_noperspective
;
1970 var
->interpolation
= ir_var_smooth
;
1972 var
->pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
1973 var
->origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
1974 if ((qual
->flags
.q
.origin_upper_left
|| qual
->flags
.q
.pixel_center_integer
)
1975 && (strcmp(var
->name
, "gl_FragCoord") != 0)) {
1976 const char *const qual_string
= (qual
->flags
.q
.origin_upper_left
)
1977 ? "origin_upper_left" : "pixel_center_integer";
1979 _mesa_glsl_error(loc
, state
,
1980 "layout qualifier `%s' can only be applied to "
1981 "fragment shader input `gl_FragCoord'",
1985 if (qual
->flags
.q
.explicit_location
) {
1986 const bool global_scope
= (state
->current_function
== NULL
);
1988 const char *string
= "";
1990 /* In the vertex shader only shader inputs can be given explicit
1993 * In the fragment shader only shader outputs can be given explicit
1996 switch (state
->target
) {
1998 if (!global_scope
|| (var
->mode
!= ir_var_in
)) {
2004 case geometry_shader
:
2005 _mesa_glsl_error(loc
, state
,
2006 "geometry shader variables cannot be given "
2007 "explicit locations\n");
2010 case fragment_shader
:
2011 if (!global_scope
|| (var
->mode
!= ir_var_out
)) {
2019 _mesa_glsl_error(loc
, state
,
2020 "only %s shader %s variables can be given an "
2021 "explicit location\n",
2022 _mesa_glsl_shader_target_name(state
->target
),
2025 var
->explicit_location
= true;
2027 /* This bit of silliness is needed because invalid explicit locations
2028 * are supposed to be flagged during linking. Small negative values
2029 * biased by VERT_ATTRIB_GENERIC0 or FRAG_RESULT_DATA0 could alias
2030 * built-in values (e.g., -16+VERT_ATTRIB_GENERIC0 = VERT_ATTRIB_POS).
2031 * The linker needs to be able to differentiate these cases. This
2032 * ensures that negative values stay negative.
2034 if (qual
->location
>= 0) {
2035 var
->location
= (state
->target
== vertex_shader
)
2036 ? (qual
->location
+ VERT_ATTRIB_GENERIC0
)
2037 : (qual
->location
+ FRAG_RESULT_DATA0
);
2039 var
->location
= qual
->location
;
2044 /* Does the declaration use the 'layout' keyword?
2046 const bool uses_layout
= qual
->flags
.q
.pixel_center_integer
2047 || qual
->flags
.q
.origin_upper_left
2048 || qual
->flags
.q
.explicit_location
;
2050 /* Does the declaration use the deprecated 'attribute' or 'varying'
2053 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
2054 || qual
->flags
.q
.varying
;
2056 /* Is the 'layout' keyword used with parameters that allow relaxed checking.
2057 * Many implementations of GL_ARB_fragment_coord_conventions_enable and some
2058 * implementations (only Mesa?) GL_ARB_explicit_attrib_location_enable
2059 * allowed the layout qualifier to be used with 'varying' and 'attribute'.
2060 * These extensions and all following extensions that add the 'layout'
2061 * keyword have been modified to require the use of 'in' or 'out'.
2063 * The following extension do not allow the deprecated keywords:
2065 * GL_AMD_conservative_depth
2066 * GL_ARB_gpu_shader5
2067 * GL_ARB_separate_shader_objects
2068 * GL_ARB_tesselation_shader
2069 * GL_ARB_transform_feedback3
2070 * GL_ARB_uniform_buffer_object
2072 * It is unknown whether GL_EXT_shader_image_load_store or GL_NV_gpu_shader5
2073 * allow layout with the deprecated keywords.
2075 const bool relaxed_layout_qualifier_checking
=
2076 state
->ARB_fragment_coord_conventions_enable
;
2078 if (uses_layout
&& uses_deprecated_qualifier
) {
2079 if (relaxed_layout_qualifier_checking
) {
2080 _mesa_glsl_warning(loc
, state
,
2081 "`layout' qualifier may not be used with "
2082 "`attribute' or `varying'");
2084 _mesa_glsl_error(loc
, state
,
2085 "`layout' qualifier may not be used with "
2086 "`attribute' or `varying'");
2090 /* Layout qualifiers for gl_FragDepth, which are enabled by extension
2091 * AMD_conservative_depth.
2093 int depth_layout_count
= qual
->flags
.q
.depth_any
2094 + qual
->flags
.q
.depth_greater
2095 + qual
->flags
.q
.depth_less
2096 + qual
->flags
.q
.depth_unchanged
;
2097 if (depth_layout_count
> 0
2098 && !state
->AMD_conservative_depth_enable
) {
2099 _mesa_glsl_error(loc
, state
,
2100 "extension GL_AMD_conservative_depth must be enabled "
2101 "to use depth layout qualifiers");
2102 } else if (depth_layout_count
> 0
2103 && strcmp(var
->name
, "gl_FragDepth") != 0) {
2104 _mesa_glsl_error(loc
, state
,
2105 "depth layout qualifiers can be applied only to "
2107 } else if (depth_layout_count
> 1
2108 && strcmp(var
->name
, "gl_FragDepth") == 0) {
2109 _mesa_glsl_error(loc
, state
,
2110 "at most one depth layout qualifier can be applied to "
2113 if (qual
->flags
.q
.depth_any
)
2114 var
->depth_layout
= ir_depth_layout_any
;
2115 else if (qual
->flags
.q
.depth_greater
)
2116 var
->depth_layout
= ir_depth_layout_greater
;
2117 else if (qual
->flags
.q
.depth_less
)
2118 var
->depth_layout
= ir_depth_layout_less
;
2119 else if (qual
->flags
.q
.depth_unchanged
)
2120 var
->depth_layout
= ir_depth_layout_unchanged
;
2122 var
->depth_layout
= ir_depth_layout_none
;
2126 * Get the variable that is being redeclared by this declaration
2128 * Semantic checks to verify the validity of the redeclaration are also
2129 * performed. If semantic checks fail, compilation error will be emitted via
2130 * \c _mesa_glsl_error, but a non-\c NULL pointer will still be returned.
2133 * A pointer to an existing variable in the current scope if the declaration
2134 * is a redeclaration, \c NULL otherwise.
2137 get_variable_being_redeclared(ir_variable
*var
, ast_declaration
*decl
,
2138 struct _mesa_glsl_parse_state
*state
)
2140 /* Check if this declaration is actually a re-declaration, either to
2141 * resize an array or add qualifiers to an existing variable.
2143 * This is allowed for variables in the current scope, or when at
2144 * global scope (for built-ins in the implicit outer scope).
2146 ir_variable
*earlier
= state
->symbols
->get_variable(decl
->identifier
);
2147 if (earlier
== NULL
||
2148 (state
->current_function
!= NULL
&&
2149 !state
->symbols
->name_declared_this_scope(decl
->identifier
))) {
2154 YYLTYPE loc
= decl
->get_location();
2156 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec,
2158 * "It is legal to declare an array without a size and then
2159 * later re-declare the same name as an array of the same
2160 * type and specify a size."
2162 if ((earlier
->type
->array_size() == 0)
2163 && var
->type
->is_array()
2164 && (var
->type
->element_type() == earlier
->type
->element_type())) {
2165 /* FINISHME: This doesn't match the qualifiers on the two
2166 * FINISHME: declarations. It's not 100% clear whether this is
2167 * FINISHME: required or not.
2170 const unsigned size
= unsigned(var
->type
->array_size());
2171 check_builtin_array_max_size(var
->name
, size
, loc
, state
);
2172 if ((size
> 0) && (size
<= earlier
->max_array_access
)) {
2173 _mesa_glsl_error(& loc
, state
, "array size must be > %u due to "
2175 earlier
->max_array_access
);
2178 earlier
->type
= var
->type
;
2181 } else if (state
->ARB_fragment_coord_conventions_enable
2182 && strcmp(var
->name
, "gl_FragCoord") == 0
2183 && earlier
->type
== var
->type
2184 && earlier
->mode
== var
->mode
) {
2185 /* Allow redeclaration of gl_FragCoord for ARB_fcc layout
2188 earlier
->origin_upper_left
= var
->origin_upper_left
;
2189 earlier
->pixel_center_integer
= var
->pixel_center_integer
;
2191 /* According to section 4.3.7 of the GLSL 1.30 spec,
2192 * the following built-in varaibles can be redeclared with an
2193 * interpolation qualifier:
2196 * * gl_FrontSecondaryColor
2197 * * gl_BackSecondaryColor
2199 * * gl_SecondaryColor
2201 } else if (state
->language_version
>= 130
2202 && (strcmp(var
->name
, "gl_FrontColor") == 0
2203 || strcmp(var
->name
, "gl_BackColor") == 0
2204 || strcmp(var
->name
, "gl_FrontSecondaryColor") == 0
2205 || strcmp(var
->name
, "gl_BackSecondaryColor") == 0
2206 || strcmp(var
->name
, "gl_Color") == 0
2207 || strcmp(var
->name
, "gl_SecondaryColor") == 0)
2208 && earlier
->type
== var
->type
2209 && earlier
->mode
== var
->mode
) {
2210 earlier
->interpolation
= var
->interpolation
;
2212 /* Layout qualifiers for gl_FragDepth. */
2213 } else if (state
->AMD_conservative_depth_enable
2214 && strcmp(var
->name
, "gl_FragDepth") == 0
2215 && earlier
->type
== var
->type
2216 && earlier
->mode
== var
->mode
) {
2218 /** From the AMD_conservative_depth spec:
2219 * Within any shader, the first redeclarations of gl_FragDepth
2220 * must appear before any use of gl_FragDepth.
2222 if (earlier
->used
) {
2223 _mesa_glsl_error(&loc
, state
,
2224 "the first redeclaration of gl_FragDepth "
2225 "must appear before any use of gl_FragDepth");
2228 /* Prevent inconsistent redeclaration of depth layout qualifier. */
2229 if (earlier
->depth_layout
!= ir_depth_layout_none
2230 && earlier
->depth_layout
!= var
->depth_layout
) {
2231 _mesa_glsl_error(&loc
, state
,
2232 "gl_FragDepth: depth layout is declared here "
2233 "as '%s, but it was previously declared as "
2235 depth_layout_string(var
->depth_layout
),
2236 depth_layout_string(earlier
->depth_layout
));
2239 earlier
->depth_layout
= var
->depth_layout
;
2242 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", decl
->identifier
);
2249 * Generate the IR for an initializer in a variable declaration
2252 process_initializer(ir_variable
*var
, ast_declaration
*decl
,
2253 ast_fully_specified_type
*type
,
2254 exec_list
*initializer_instructions
,
2255 struct _mesa_glsl_parse_state
*state
)
2257 ir_rvalue
*result
= NULL
;
2259 YYLTYPE initializer_loc
= decl
->initializer
->get_location();
2261 /* From page 24 (page 30 of the PDF) of the GLSL 1.10 spec:
2263 * "All uniform variables are read-only and are initialized either
2264 * directly by an application via API commands, or indirectly by
2267 if ((state
->language_version
<= 110)
2268 && (var
->mode
== ir_var_uniform
)) {
2269 _mesa_glsl_error(& initializer_loc
, state
,
2270 "cannot initialize uniforms in GLSL 1.10");
2273 if (var
->type
->is_sampler()) {
2274 _mesa_glsl_error(& initializer_loc
, state
,
2275 "cannot initialize samplers");
2278 if ((var
->mode
== ir_var_in
) && (state
->current_function
== NULL
)) {
2279 _mesa_glsl_error(& initializer_loc
, state
,
2280 "cannot initialize %s shader input / %s",
2281 _mesa_glsl_shader_target_name(state
->target
),
2282 (state
->target
== vertex_shader
)
2283 ? "attribute" : "varying");
2286 ir_dereference
*const lhs
= new(state
) ir_dereference_variable(var
);
2287 ir_rvalue
*rhs
= decl
->initializer
->hir(initializer_instructions
,
2290 /* Calculate the constant value if this is a const or uniform
2293 if (type
->qualifier
.flags
.q
.constant
2294 || type
->qualifier
.flags
.q
.uniform
) {
2295 ir_rvalue
*new_rhs
= validate_assignment(state
, var
->type
, rhs
, true);
2296 if (new_rhs
!= NULL
) {
2299 ir_constant
*constant_value
= rhs
->constant_expression_value();
2300 if (!constant_value
) {
2301 _mesa_glsl_error(& initializer_loc
, state
,
2302 "initializer of %s variable `%s' must be a "
2303 "constant expression",
2304 (type
->qualifier
.flags
.q
.constant
)
2305 ? "const" : "uniform",
2307 if (var
->type
->is_numeric()) {
2308 /* Reduce cascading errors. */
2309 var
->constant_value
= ir_constant::zero(state
, var
->type
);
2312 rhs
= constant_value
;
2313 var
->constant_value
= constant_value
;
2316 _mesa_glsl_error(&initializer_loc
, state
,
2317 "initializer of type %s cannot be assigned to "
2318 "variable of type %s",
2319 rhs
->type
->name
, var
->type
->name
);
2320 if (var
->type
->is_numeric()) {
2321 /* Reduce cascading errors. */
2322 var
->constant_value
= ir_constant::zero(state
, var
->type
);
2327 if (rhs
&& !rhs
->type
->is_error()) {
2328 bool temp
= var
->read_only
;
2329 if (type
->qualifier
.flags
.q
.constant
)
2330 var
->read_only
= false;
2332 /* Never emit code to initialize a uniform.
2334 const glsl_type
*initializer_type
;
2335 if (!type
->qualifier
.flags
.q
.uniform
) {
2336 result
= do_assignment(initializer_instructions
, state
,
2338 type
->get_location());
2339 initializer_type
= result
->type
;
2341 initializer_type
= rhs
->type
;
2343 /* If the declared variable is an unsized array, it must inherrit
2344 * its full type from the initializer. A declaration such as
2346 * uniform float a[] = float[](1.0, 2.0, 3.0, 3.0);
2350 * uniform float a[4] = float[](1.0, 2.0, 3.0, 3.0);
2352 * The assignment generated in the if-statement (below) will also
2353 * automatically handle this case for non-uniforms.
2355 * If the declared variable is not an array, the types must
2356 * already match exactly. As a result, the type assignment
2357 * here can be done unconditionally. For non-uniforms the call
2358 * to do_assignment can change the type of the initializer (via
2359 * the implicit conversion rules). For uniforms the initializer
2360 * must be a constant expression, and the type of that expression
2361 * was validated above.
2363 var
->type
= initializer_type
;
2365 var
->read_only
= temp
;
2372 ast_declarator_list::hir(exec_list
*instructions
,
2373 struct _mesa_glsl_parse_state
*state
)
2376 const struct glsl_type
*decl_type
;
2377 const char *type_name
= NULL
;
2378 ir_rvalue
*result
= NULL
;
2379 YYLTYPE loc
= this->get_location();
2381 /* From page 46 (page 52 of the PDF) of the GLSL 1.50 spec:
2383 * "To ensure that a particular output variable is invariant, it is
2384 * necessary to use the invariant qualifier. It can either be used to
2385 * qualify a previously declared variable as being invariant
2387 * invariant gl_Position; // make existing gl_Position be invariant"
2389 * In these cases the parser will set the 'invariant' flag in the declarator
2390 * list, and the type will be NULL.
2392 if (this->invariant
) {
2393 assert(this->type
== NULL
);
2395 if (state
->current_function
!= NULL
) {
2396 _mesa_glsl_error(& loc
, state
,
2397 "All uses of `invariant' keyword must be at global "
2401 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
2402 assert(!decl
->is_array
);
2403 assert(decl
->array_size
== NULL
);
2404 assert(decl
->initializer
== NULL
);
2406 ir_variable
*const earlier
=
2407 state
->symbols
->get_variable(decl
->identifier
);
2408 if (earlier
== NULL
) {
2409 _mesa_glsl_error(& loc
, state
,
2410 "Undeclared variable `%s' cannot be marked "
2411 "invariant\n", decl
->identifier
);
2412 } else if ((state
->target
== vertex_shader
)
2413 && (earlier
->mode
!= ir_var_out
)) {
2414 _mesa_glsl_error(& loc
, state
,
2415 "`%s' cannot be marked invariant, vertex shader "
2416 "outputs only\n", decl
->identifier
);
2417 } else if ((state
->target
== fragment_shader
)
2418 && (earlier
->mode
!= ir_var_in
)) {
2419 _mesa_glsl_error(& loc
, state
,
2420 "`%s' cannot be marked invariant, fragment shader "
2421 "inputs only\n", decl
->identifier
);
2422 } else if (earlier
->used
) {
2423 _mesa_glsl_error(& loc
, state
,
2424 "variable `%s' may not be redeclared "
2425 "`invariant' after being used",
2428 earlier
->invariant
= true;
2432 /* Invariant redeclarations do not have r-values.
2437 assert(this->type
!= NULL
);
2438 assert(!this->invariant
);
2440 /* The type specifier may contain a structure definition. Process that
2441 * before any of the variable declarations.
2443 (void) this->type
->specifier
->hir(instructions
, state
);
2445 decl_type
= this->type
->specifier
->glsl_type(& type_name
, state
);
2446 if (this->declarations
.is_empty()) {
2447 if (decl_type
!= NULL
) {
2448 /* Warn if this empty declaration is not for declaring a structure.
2450 if (this->type
->specifier
->structure
== NULL
) {
2451 _mesa_glsl_warning(&loc
, state
, "empty declaration");
2454 _mesa_glsl_error(& loc
, state
, "incomplete declaration");
2458 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
2459 const struct glsl_type
*var_type
;
2462 /* FINISHME: Emit a warning if a variable declaration shadows a
2463 * FINISHME: declaration at a higher scope.
2466 if ((decl_type
== NULL
) || decl_type
->is_void()) {
2467 if (type_name
!= NULL
) {
2468 _mesa_glsl_error(& loc
, state
,
2469 "invalid type `%s' in declaration of `%s'",
2470 type_name
, decl
->identifier
);
2472 _mesa_glsl_error(& loc
, state
,
2473 "invalid type in declaration of `%s'",
2479 if (decl
->is_array
) {
2480 var_type
= process_array_type(&loc
, decl_type
, decl
->array_size
,
2483 var_type
= decl_type
;
2486 var
= new(ctx
) ir_variable(var_type
, decl
->identifier
, ir_var_auto
);
2488 /* From page 22 (page 28 of the PDF) of the GLSL 1.10 specification;
2490 * "Global variables can only use the qualifiers const,
2491 * attribute, uni form, or varying. Only one may be
2494 * Local variables can only use the qualifier const."
2496 * This is relaxed in GLSL 1.30. It is also relaxed by any extension
2497 * that adds the 'layout' keyword.
2499 if ((state
->language_version
< 130)
2500 && !state
->ARB_explicit_attrib_location_enable
2501 && !state
->ARB_fragment_coord_conventions_enable
) {
2502 if (this->type
->qualifier
.flags
.q
.out
) {
2503 _mesa_glsl_error(& loc
, state
,
2504 "`out' qualifier in declaration of `%s' "
2505 "only valid for function parameters in %s.",
2506 decl
->identifier
, state
->version_string
);
2508 if (this->type
->qualifier
.flags
.q
.in
) {
2509 _mesa_glsl_error(& loc
, state
,
2510 "`in' qualifier in declaration of `%s' "
2511 "only valid for function parameters in %s.",
2512 decl
->identifier
, state
->version_string
);
2514 /* FINISHME: Test for other invalid qualifiers. */
2517 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
,
2520 if (this->type
->qualifier
.flags
.q
.invariant
) {
2521 if ((state
->target
== vertex_shader
) && !(var
->mode
== ir_var_out
||
2522 var
->mode
== ir_var_inout
)) {
2523 /* FINISHME: Note that this doesn't work for invariant on
2524 * a function signature outval
2526 _mesa_glsl_error(& loc
, state
,
2527 "`%s' cannot be marked invariant, vertex shader "
2528 "outputs only\n", var
->name
);
2529 } else if ((state
->target
== fragment_shader
) &&
2530 !(var
->mode
== ir_var_in
|| var
->mode
== ir_var_inout
)) {
2531 /* FINISHME: Note that this doesn't work for invariant on
2532 * a function signature inval
2534 _mesa_glsl_error(& loc
, state
,
2535 "`%s' cannot be marked invariant, fragment shader "
2536 "inputs only\n", var
->name
);
2540 if (state
->current_function
!= NULL
) {
2541 const char *mode
= NULL
;
2542 const char *extra
= "";
2544 /* There is no need to check for 'inout' here because the parser will
2545 * only allow that in function parameter lists.
2547 if (this->type
->qualifier
.flags
.q
.attribute
) {
2549 } else if (this->type
->qualifier
.flags
.q
.uniform
) {
2551 } else if (this->type
->qualifier
.flags
.q
.varying
) {
2553 } else if (this->type
->qualifier
.flags
.q
.in
) {
2555 extra
= " or in function parameter list";
2556 } else if (this->type
->qualifier
.flags
.q
.out
) {
2558 extra
= " or in function parameter list";
2562 _mesa_glsl_error(& loc
, state
,
2563 "%s variable `%s' must be declared at "
2565 mode
, var
->name
, extra
);
2567 } else if (var
->mode
== ir_var_in
) {
2568 var
->read_only
= true;
2570 if (state
->target
== vertex_shader
) {
2571 bool error_emitted
= false;
2573 /* From page 31 (page 37 of the PDF) of the GLSL 1.50 spec:
2575 * "Vertex shader inputs can only be float, floating-point
2576 * vectors, matrices, signed and unsigned integers and integer
2577 * vectors. Vertex shader inputs can also form arrays of these
2578 * types, but not structures."
2580 * From page 31 (page 27 of the PDF) of the GLSL 1.30 spec:
2582 * "Vertex shader inputs can only be float, floating-point
2583 * vectors, matrices, signed and unsigned integers and integer
2584 * vectors. They cannot be arrays or structures."
2586 * From page 23 (page 29 of the PDF) of the GLSL 1.20 spec:
2588 * "The attribute qualifier can be used only with float,
2589 * floating-point vectors, and matrices. Attribute variables
2590 * cannot be declared as arrays or structures."
2592 const glsl_type
*check_type
= var
->type
->is_array()
2593 ? var
->type
->fields
.array
: var
->type
;
2595 switch (check_type
->base_type
) {
2596 case GLSL_TYPE_FLOAT
:
2598 case GLSL_TYPE_UINT
:
2600 if (state
->language_version
> 120)
2604 _mesa_glsl_error(& loc
, state
,
2605 "vertex shader input / attribute cannot have "
2607 var
->type
->is_array() ? "array of " : "",
2609 error_emitted
= true;
2612 if (!error_emitted
&& (state
->language_version
<= 130)
2613 && var
->type
->is_array()) {
2614 _mesa_glsl_error(& loc
, state
,
2615 "vertex shader input / attribute cannot have "
2617 error_emitted
= true;
2622 /* Integer vertex outputs must be qualified with 'flat'.
2624 * From section 4.3.6 of the GLSL 1.30 spec:
2625 * "If a vertex output is a signed or unsigned integer or integer
2626 * vector, then it must be qualified with the interpolation qualifier
2629 if (state
->language_version
>= 130
2630 && state
->target
== vertex_shader
2631 && state
->current_function
== NULL
2632 && var
->type
->is_integer()
2633 && var
->mode
== ir_var_out
2634 && var
->interpolation
!= ir_var_flat
) {
2636 _mesa_glsl_error(&loc
, state
, "If a vertex output is an integer, "
2637 "then it must be qualified with 'flat'");
2641 /* Interpolation qualifiers cannot be applied to 'centroid' and
2642 * 'centroid varying'.
2644 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
2645 * "interpolation qualifiers may only precede the qualifiers in,
2646 * centroid in, out, or centroid out in a declaration. They do not apply
2647 * to the deprecated storage qualifiers varying or centroid varying."
2649 if (state
->language_version
>= 130
2650 && this->type
->qualifier
.has_interpolation()
2651 && this->type
->qualifier
.flags
.q
.varying
) {
2653 const char *i
= this->type
->qualifier
.interpolation_string();
2656 if (this->type
->qualifier
.flags
.q
.centroid
)
2657 s
= "centroid varying";
2661 _mesa_glsl_error(&loc
, state
,
2662 "qualifier '%s' cannot be applied to the "
2663 "deprecated storage qualifier '%s'", i
, s
);
2667 /* Interpolation qualifiers can only apply to vertex shader outputs and
2668 * fragment shader inputs.
2670 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
2671 * "Outputs from a vertex shader (out) and inputs to a fragment
2672 * shader (in) can be further qualified with one or more of these
2673 * interpolation qualifiers"
2675 if (state
->language_version
>= 130
2676 && this->type
->qualifier
.has_interpolation()) {
2678 const char *i
= this->type
->qualifier
.interpolation_string();
2681 switch (state
->target
) {
2683 if (this->type
->qualifier
.flags
.q
.in
) {
2684 _mesa_glsl_error(&loc
, state
,
2685 "qualifier '%s' cannot be applied to vertex "
2686 "shader inputs", i
);
2689 case fragment_shader
:
2690 if (this->type
->qualifier
.flags
.q
.out
) {
2691 _mesa_glsl_error(&loc
, state
,
2692 "qualifier '%s' cannot be applied to fragment "
2693 "shader outputs", i
);
2702 /* From section 4.3.4 of the GLSL 1.30 spec:
2703 * "It is an error to use centroid in in a vertex shader."
2705 if (state
->language_version
>= 130
2706 && this->type
->qualifier
.flags
.q
.centroid
2707 && this->type
->qualifier
.flags
.q
.in
2708 && state
->target
== vertex_shader
) {
2710 _mesa_glsl_error(&loc
, state
,
2711 "'centroid in' cannot be used in a vertex shader");
2715 /* Precision qualifiers exists only in GLSL versions 1.00 and >= 1.30.
2717 if (this->type
->specifier
->precision
!= ast_precision_none
2718 && state
->language_version
!= 100
2719 && state
->language_version
< 130) {
2721 _mesa_glsl_error(&loc
, state
,
2722 "precision qualifiers are supported only in GLSL ES "
2723 "1.00, and GLSL 1.30 and later");
2727 /* Precision qualifiers only apply to floating point and integer types.
2729 * From section 4.5.2 of the GLSL 1.30 spec:
2730 * "Any floating point or any integer declaration can have the type
2731 * preceded by one of these precision qualifiers [...] Literal
2732 * constants do not have precision qualifiers. Neither do Boolean
2735 * In GLSL ES, sampler types are also allowed.
2737 * From page 87 of the GLSL ES spec:
2738 * "RESOLUTION: Allow sampler types to take a precision qualifier."
2740 if (this->type
->specifier
->precision
!= ast_precision_none
2741 && !var
->type
->is_float()
2742 && !var
->type
->is_integer()
2743 && !(var
->type
->is_sampler() && state
->es_shader
)
2744 && !(var
->type
->is_array()
2745 && (var
->type
->fields
.array
->is_float()
2746 || var
->type
->fields
.array
->is_integer()))) {
2748 _mesa_glsl_error(&loc
, state
,
2749 "precision qualifiers apply only to floating point"
2750 "%s types", state
->es_shader
? ", integer, and sampler"
2754 /* From page 17 (page 23 of the PDF) of the GLSL 1.20 spec:
2756 * "[Sampler types] can only be declared as function
2757 * parameters or uniform variables (see Section 4.3.5
2760 if (var_type
->contains_sampler() &&
2761 !this->type
->qualifier
.flags
.q
.uniform
) {
2762 _mesa_glsl_error(&loc
, state
, "samplers must be declared uniform");
2765 /* Process the initializer and add its instructions to a temporary
2766 * list. This list will be added to the instruction stream (below) after
2767 * the declaration is added. This is done because in some cases (such as
2768 * redeclarations) the declaration may not actually be added to the
2769 * instruction stream.
2771 exec_list initializer_instructions
;
2772 ir_variable
*earlier
= get_variable_being_redeclared(var
, decl
, state
);
2774 if (decl
->initializer
!= NULL
) {
2775 result
= process_initializer((earlier
== NULL
) ? var
: earlier
,
2777 &initializer_instructions
, state
);
2780 /* From page 23 (page 29 of the PDF) of the GLSL 1.10 spec:
2782 * "It is an error to write to a const variable outside of
2783 * its declaration, so they must be initialized when
2786 if (this->type
->qualifier
.flags
.q
.constant
&& decl
->initializer
== NULL
) {
2787 _mesa_glsl_error(& loc
, state
,
2788 "const declaration of `%s' must be initialized",
2792 /* If the declaration is not a redeclaration, there are a few additional
2793 * semantic checks that must be applied. In addition, variable that was
2794 * created for the declaration should be added to the IR stream.
2796 if (earlier
== NULL
) {
2797 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
2799 * "Identifiers starting with "gl_" are reserved for use by
2800 * OpenGL, and may not be declared in a shader as either a
2801 * variable or a function."
2803 if (strncmp(decl
->identifier
, "gl_", 3) == 0)
2804 _mesa_glsl_error(& loc
, state
,
2805 "identifier `%s' uses reserved `gl_' prefix",
2808 /* Add the variable to the symbol table. Note that the initializer's
2809 * IR was already processed earlier (though it hasn't been emitted
2810 * yet), without the variable in scope.
2812 * This differs from most C-like languages, but it follows the GLSL
2813 * specification. From page 28 (page 34 of the PDF) of the GLSL 1.50
2816 * "Within a declaration, the scope of a name starts immediately
2817 * after the initializer if present or immediately after the name
2818 * being declared if not."
2820 if (!state
->symbols
->add_variable(var
)) {
2821 YYLTYPE loc
= this->get_location();
2822 _mesa_glsl_error(&loc
, state
, "name `%s' already taken in the "
2823 "current scope", decl
->identifier
);
2827 /* Push the variable declaration to the top. It means that all the
2828 * variable declarations will appear in a funny last-to-first order,
2829 * but otherwise we run into trouble if a function is prototyped, a
2830 * global var is decled, then the function is defined with usage of
2831 * the global var. See glslparsertest's CorrectModule.frag.
2833 instructions
->push_head(var
);
2836 instructions
->append_list(&initializer_instructions
);
2840 /* Generally, variable declarations do not have r-values. However,
2841 * one is used for the declaration in
2843 * while (bool b = some_condition()) {
2847 * so we return the rvalue from the last seen declaration here.
2854 ast_parameter_declarator::hir(exec_list
*instructions
,
2855 struct _mesa_glsl_parse_state
*state
)
2858 const struct glsl_type
*type
;
2859 const char *name
= NULL
;
2860 YYLTYPE loc
= this->get_location();
2862 type
= this->type
->specifier
->glsl_type(& name
, state
);
2866 _mesa_glsl_error(& loc
, state
,
2867 "invalid type `%s' in declaration of `%s'",
2868 name
, this->identifier
);
2870 _mesa_glsl_error(& loc
, state
,
2871 "invalid type in declaration of `%s'",
2875 type
= glsl_type::error_type
;
2878 /* From page 62 (page 68 of the PDF) of the GLSL 1.50 spec:
2880 * "Functions that accept no input arguments need not use void in the
2881 * argument list because prototypes (or definitions) are required and
2882 * therefore there is no ambiguity when an empty argument list "( )" is
2883 * declared. The idiom "(void)" as a parameter list is provided for
2886 * Placing this check here prevents a void parameter being set up
2887 * for a function, which avoids tripping up checks for main taking
2888 * parameters and lookups of an unnamed symbol.
2890 if (type
->is_void()) {
2891 if (this->identifier
!= NULL
)
2892 _mesa_glsl_error(& loc
, state
,
2893 "named parameter cannot have type `void'");
2899 if (formal_parameter
&& (this->identifier
== NULL
)) {
2900 _mesa_glsl_error(& loc
, state
, "formal parameter lacks a name");
2904 /* This only handles "vec4 foo[..]". The earlier specifier->glsl_type(...)
2905 * call already handled the "vec4[..] foo" case.
2907 if (this->is_array
) {
2908 type
= process_array_type(&loc
, type
, this->array_size
, state
);
2911 if (type
->array_size() == 0) {
2912 _mesa_glsl_error(&loc
, state
, "arrays passed as parameters must have "
2913 "a declared size.");
2914 type
= glsl_type::error_type
;
2918 ir_variable
*var
= new(ctx
) ir_variable(type
, this->identifier
, ir_var_in
);
2920 /* Apply any specified qualifiers to the parameter declaration. Note that
2921 * for function parameters the default mode is 'in'.
2923 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
, & loc
);
2925 /* From page 17 (page 23 of the PDF) of the GLSL 1.20 spec:
2927 * "Samplers cannot be treated as l-values; hence cannot be used
2928 * as out or inout function parameters, nor can they be assigned
2931 if ((var
->mode
== ir_var_inout
|| var
->mode
== ir_var_out
)
2932 && type
->contains_sampler()) {
2933 _mesa_glsl_error(&loc
, state
, "out and inout parameters cannot contain samplers");
2934 type
= glsl_type::error_type
;
2937 /* From page 39 (page 45 of the PDF) of the GLSL 1.10 spec:
2939 * "When calling a function, expressions that do not evaluate to
2940 * l-values cannot be passed to parameters declared as out or inout."
2942 * From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
2944 * "Other binary or unary expressions, non-dereferenced arrays,
2945 * function names, swizzles with repeated fields, and constants
2946 * cannot be l-values."
2948 * So for GLSL 1.10, passing an array as an out or inout parameter is not
2949 * allowed. This restriction is removed in GLSL 1.20, and in GLSL ES.
2951 if ((var
->mode
== ir_var_inout
|| var
->mode
== ir_var_out
)
2952 && type
->is_array() && state
->language_version
== 110) {
2953 _mesa_glsl_error(&loc
, state
, "Arrays cannot be out or inout parameters in GLSL 1.10");
2954 type
= glsl_type::error_type
;
2957 instructions
->push_tail(var
);
2959 /* Parameter declarations do not have r-values.
2966 ast_parameter_declarator::parameters_to_hir(exec_list
*ast_parameters
,
2968 exec_list
*ir_parameters
,
2969 _mesa_glsl_parse_state
*state
)
2971 ast_parameter_declarator
*void_param
= NULL
;
2974 foreach_list_typed (ast_parameter_declarator
, param
, link
, ast_parameters
) {
2975 param
->formal_parameter
= formal
;
2976 param
->hir(ir_parameters
, state
);
2984 if ((void_param
!= NULL
) && (count
> 1)) {
2985 YYLTYPE loc
= void_param
->get_location();
2987 _mesa_glsl_error(& loc
, state
,
2988 "`void' parameter must be only parameter");
2994 emit_function(_mesa_glsl_parse_state
*state
, ir_function
*f
)
2996 /* IR invariants disallow function declarations or definitions
2997 * nested within other function definitions. But there is no
2998 * requirement about the relative order of function declarations
2999 * and definitions with respect to one another. So simply insert
3000 * the new ir_function block at the end of the toplevel instruction
3003 state
->toplevel_ir
->push_tail(f
);
3008 ast_function::hir(exec_list
*instructions
,
3009 struct _mesa_glsl_parse_state
*state
)
3012 ir_function
*f
= NULL
;
3013 ir_function_signature
*sig
= NULL
;
3014 exec_list hir_parameters
;
3016 const char *const name
= identifier
;
3018 /* New functions are always added to the top-level IR instruction stream,
3019 * so this instruction list pointer is ignored. See also emit_function
3022 (void) instructions
;
3024 /* From page 21 (page 27 of the PDF) of the GLSL 1.20 spec,
3026 * "Function declarations (prototypes) cannot occur inside of functions;
3027 * they must be at global scope, or for the built-in functions, outside
3028 * the global scope."
3030 * From page 27 (page 33 of the PDF) of the GLSL ES 1.00.16 spec,
3032 * "User defined functions may only be defined within the global scope."
3034 * Note that this language does not appear in GLSL 1.10.
3036 if ((state
->current_function
!= NULL
) && (state
->language_version
!= 110)) {
3037 YYLTYPE loc
= this->get_location();
3038 _mesa_glsl_error(&loc
, state
,
3039 "declaration of function `%s' not allowed within "
3040 "function body", name
);
3043 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
3045 * "Identifiers starting with "gl_" are reserved for use by
3046 * OpenGL, and may not be declared in a shader as either a
3047 * variable or a function."
3049 if (strncmp(name
, "gl_", 3) == 0) {
3050 YYLTYPE loc
= this->get_location();
3051 _mesa_glsl_error(&loc
, state
,
3052 "identifier `%s' uses reserved `gl_' prefix", name
);
3055 /* Convert the list of function parameters to HIR now so that they can be
3056 * used below to compare this function's signature with previously seen
3057 * signatures for functions with the same name.
3059 ast_parameter_declarator::parameters_to_hir(& this->parameters
,
3061 & hir_parameters
, state
);
3063 const char *return_type_name
;
3064 const glsl_type
*return_type
=
3065 this->return_type
->specifier
->glsl_type(& return_type_name
, state
);
3068 YYLTYPE loc
= this->get_location();
3069 _mesa_glsl_error(&loc
, state
,
3070 "function `%s' has undeclared return type `%s'",
3071 name
, return_type_name
);
3072 return_type
= glsl_type::error_type
;
3075 /* From page 56 (page 62 of the PDF) of the GLSL 1.30 spec:
3076 * "No qualifier is allowed on the return type of a function."
3078 if (this->return_type
->has_qualifiers()) {
3079 YYLTYPE loc
= this->get_location();
3080 _mesa_glsl_error(& loc
, state
,
3081 "function `%s' return type has qualifiers", name
);
3084 /* From page 17 (page 23 of the PDF) of the GLSL 1.20 spec:
3086 * "[Sampler types] can only be declared as function parameters
3087 * or uniform variables (see Section 4.3.5 "Uniform")".
3089 if (return_type
->contains_sampler()) {
3090 YYLTYPE loc
= this->get_location();
3091 _mesa_glsl_error(&loc
, state
,
3092 "function `%s' return type can't contain a sampler",
3096 /* Verify that this function's signature either doesn't match a previously
3097 * seen signature for a function with the same name, or, if a match is found,
3098 * that the previously seen signature does not have an associated definition.
3100 f
= state
->symbols
->get_function(name
);
3101 if (f
!= NULL
&& (state
->es_shader
|| f
->has_user_signature())) {
3102 sig
= f
->exact_matching_signature(&hir_parameters
);
3104 const char *badvar
= sig
->qualifiers_match(&hir_parameters
);
3105 if (badvar
!= NULL
) {
3106 YYLTYPE loc
= this->get_location();
3108 _mesa_glsl_error(&loc
, state
, "function `%s' parameter `%s' "
3109 "qualifiers don't match prototype", name
, badvar
);
3112 if (sig
->return_type
!= return_type
) {
3113 YYLTYPE loc
= this->get_location();
3115 _mesa_glsl_error(&loc
, state
, "function `%s' return type doesn't "
3116 "match prototype", name
);
3119 if (is_definition
&& sig
->is_defined
) {
3120 YYLTYPE loc
= this->get_location();
3122 _mesa_glsl_error(& loc
, state
, "function `%s' redefined", name
);
3126 f
= new(ctx
) ir_function(name
);
3127 if (!state
->symbols
->add_function(f
)) {
3128 /* This function name shadows a non-function use of the same name. */
3129 YYLTYPE loc
= this->get_location();
3131 _mesa_glsl_error(&loc
, state
, "function name `%s' conflicts with "
3132 "non-function", name
);
3136 emit_function(state
, f
);
3139 /* Verify the return type of main() */
3140 if (strcmp(name
, "main") == 0) {
3141 if (! return_type
->is_void()) {
3142 YYLTYPE loc
= this->get_location();
3144 _mesa_glsl_error(& loc
, state
, "main() must return void");
3147 if (!hir_parameters
.is_empty()) {
3148 YYLTYPE loc
= this->get_location();
3150 _mesa_glsl_error(& loc
, state
, "main() must not take any parameters");
3154 /* Finish storing the information about this new function in its signature.
3157 sig
= new(ctx
) ir_function_signature(return_type
);
3158 f
->add_signature(sig
);
3161 sig
->replace_parameters(&hir_parameters
);
3164 /* Function declarations (prototypes) do not have r-values.
3171 ast_function_definition::hir(exec_list
*instructions
,
3172 struct _mesa_glsl_parse_state
*state
)
3174 prototype
->is_definition
= true;
3175 prototype
->hir(instructions
, state
);
3177 ir_function_signature
*signature
= prototype
->signature
;
3178 if (signature
== NULL
)
3181 assert(state
->current_function
== NULL
);
3182 state
->current_function
= signature
;
3183 state
->found_return
= false;
3185 /* Duplicate parameters declared in the prototype as concrete variables.
3186 * Add these to the symbol table.
3188 state
->symbols
->push_scope();
3189 foreach_iter(exec_list_iterator
, iter
, signature
->parameters
) {
3190 ir_variable
*const var
= ((ir_instruction
*) iter
.get())->as_variable();
3192 assert(var
!= NULL
);
3194 /* The only way a parameter would "exist" is if two parameters have
3197 if (state
->symbols
->name_declared_this_scope(var
->name
)) {
3198 YYLTYPE loc
= this->get_location();
3200 _mesa_glsl_error(& loc
, state
, "parameter `%s' redeclared", var
->name
);
3202 state
->symbols
->add_variable(var
);
3206 /* Convert the body of the function to HIR. */
3207 this->body
->hir(&signature
->body
, state
);
3208 signature
->is_defined
= true;
3210 state
->symbols
->pop_scope();
3212 assert(state
->current_function
== signature
);
3213 state
->current_function
= NULL
;
3215 if (!signature
->return_type
->is_void() && !state
->found_return
) {
3216 YYLTYPE loc
= this->get_location();
3217 _mesa_glsl_error(& loc
, state
, "function `%s' has non-void return type "
3218 "%s, but no return statement",
3219 signature
->function_name(),
3220 signature
->return_type
->name
);
3223 /* Function definitions do not have r-values.
3230 ast_jump_statement::hir(exec_list
*instructions
,
3231 struct _mesa_glsl_parse_state
*state
)
3238 assert(state
->current_function
);
3240 if (opt_return_value
) {
3241 ir_rvalue
*const ret
= opt_return_value
->hir(instructions
, state
);
3243 /* The value of the return type can be NULL if the shader says
3244 * 'return foo();' and foo() is a function that returns void.
3246 * NOTE: The GLSL spec doesn't say that this is an error. The type
3247 * of the return value is void. If the return type of the function is
3248 * also void, then this should compile without error. Seriously.
3250 const glsl_type
*const ret_type
=
3251 (ret
== NULL
) ? glsl_type::void_type
: ret
->type
;
3253 /* Implicit conversions are not allowed for return values. */
3254 if (state
->current_function
->return_type
!= ret_type
) {
3255 YYLTYPE loc
= this->get_location();
3257 _mesa_glsl_error(& loc
, state
,
3258 "`return' with wrong type %s, in function `%s' "
3261 state
->current_function
->function_name(),
3262 state
->current_function
->return_type
->name
);
3265 inst
= new(ctx
) ir_return(ret
);
3267 if (state
->current_function
->return_type
->base_type
!=
3269 YYLTYPE loc
= this->get_location();
3271 _mesa_glsl_error(& loc
, state
,
3272 "`return' with no value, in function %s returning "
3274 state
->current_function
->function_name());
3276 inst
= new(ctx
) ir_return
;
3279 state
->found_return
= true;
3280 instructions
->push_tail(inst
);
3285 if (state
->target
!= fragment_shader
) {
3286 YYLTYPE loc
= this->get_location();
3288 _mesa_glsl_error(& loc
, state
,
3289 "`discard' may only appear in a fragment shader");
3291 instructions
->push_tail(new(ctx
) ir_discard
);
3296 /* FINISHME: Handle switch-statements. They cannot contain 'continue',
3297 * FINISHME: and they use a different IR instruction for 'break'.
3299 /* FINISHME: Correctly handle the nesting. If a switch-statement is
3300 * FINISHME: inside a loop, a 'continue' is valid and will bind to the
3303 if (state
->loop_or_switch_nesting
== NULL
) {
3304 YYLTYPE loc
= this->get_location();
3306 _mesa_glsl_error(& loc
, state
,
3307 "`%s' may only appear in a loop",
3308 (mode
== ast_break
) ? "break" : "continue");
3310 ir_loop
*const loop
= state
->loop_or_switch_nesting
->as_loop();
3312 /* Inline the for loop expression again, since we don't know
3313 * where near the end of the loop body the normal copy of it
3314 * is going to be placed.
3316 if (mode
== ast_continue
&&
3317 state
->loop_or_switch_nesting_ast
->rest_expression
) {
3318 state
->loop_or_switch_nesting_ast
->rest_expression
->hir(instructions
,
3323 ir_loop_jump
*const jump
=
3324 new(ctx
) ir_loop_jump((mode
== ast_break
)
3325 ? ir_loop_jump::jump_break
3326 : ir_loop_jump::jump_continue
);
3327 instructions
->push_tail(jump
);
3334 /* Jump instructions do not have r-values.
3341 ast_selection_statement::hir(exec_list
*instructions
,
3342 struct _mesa_glsl_parse_state
*state
)
3346 ir_rvalue
*const condition
= this->condition
->hir(instructions
, state
);
3348 /* From page 66 (page 72 of the PDF) of the GLSL 1.50 spec:
3350 * "Any expression whose type evaluates to a Boolean can be used as the
3351 * conditional expression bool-expression. Vector types are not accepted
3352 * as the expression to if."
3354 * The checks are separated so that higher quality diagnostics can be
3355 * generated for cases where both rules are violated.
3357 if (!condition
->type
->is_boolean() || !condition
->type
->is_scalar()) {
3358 YYLTYPE loc
= this->condition
->get_location();
3360 _mesa_glsl_error(& loc
, state
, "if-statement condition must be scalar "
3364 ir_if
*const stmt
= new(ctx
) ir_if(condition
);
3366 if (then_statement
!= NULL
) {
3367 state
->symbols
->push_scope();
3368 then_statement
->hir(& stmt
->then_instructions
, state
);
3369 state
->symbols
->pop_scope();
3372 if (else_statement
!= NULL
) {
3373 state
->symbols
->push_scope();
3374 else_statement
->hir(& stmt
->else_instructions
, state
);
3375 state
->symbols
->pop_scope();
3378 instructions
->push_tail(stmt
);
3380 /* if-statements do not have r-values.
3387 ast_iteration_statement::condition_to_hir(ir_loop
*stmt
,
3388 struct _mesa_glsl_parse_state
*state
)
3392 if (condition
!= NULL
) {
3393 ir_rvalue
*const cond
=
3394 condition
->hir(& stmt
->body_instructions
, state
);
3397 || !cond
->type
->is_boolean() || !cond
->type
->is_scalar()) {
3398 YYLTYPE loc
= condition
->get_location();
3400 _mesa_glsl_error(& loc
, state
,
3401 "loop condition must be scalar boolean");
3403 /* As the first code in the loop body, generate a block that looks
3404 * like 'if (!condition) break;' as the loop termination condition.
3406 ir_rvalue
*const not_cond
=
3407 new(ctx
) ir_expression(ir_unop_logic_not
, glsl_type::bool_type
, cond
,
3410 ir_if
*const if_stmt
= new(ctx
) ir_if(not_cond
);
3412 ir_jump
*const break_stmt
=
3413 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
3415 if_stmt
->then_instructions
.push_tail(break_stmt
);
3416 stmt
->body_instructions
.push_tail(if_stmt
);
3423 ast_iteration_statement::hir(exec_list
*instructions
,
3424 struct _mesa_glsl_parse_state
*state
)
3428 /* For-loops and while-loops start a new scope, but do-while loops do not.
3430 if (mode
!= ast_do_while
)
3431 state
->symbols
->push_scope();
3433 if (init_statement
!= NULL
)
3434 init_statement
->hir(instructions
, state
);
3436 ir_loop
*const stmt
= new(ctx
) ir_loop();
3437 instructions
->push_tail(stmt
);
3439 /* Track the current loop and / or switch-statement nesting.
3441 ir_instruction
*const nesting
= state
->loop_or_switch_nesting
;
3442 ast_iteration_statement
*nesting_ast
= state
->loop_or_switch_nesting_ast
;
3444 state
->loop_or_switch_nesting
= stmt
;
3445 state
->loop_or_switch_nesting_ast
= this;
3447 if (mode
!= ast_do_while
)
3448 condition_to_hir(stmt
, state
);
3451 body
->hir(& stmt
->body_instructions
, state
);
3453 if (rest_expression
!= NULL
)
3454 rest_expression
->hir(& stmt
->body_instructions
, state
);
3456 if (mode
== ast_do_while
)
3457 condition_to_hir(stmt
, state
);
3459 if (mode
!= ast_do_while
)
3460 state
->symbols
->pop_scope();
3462 /* Restore previous nesting before returning.
3464 state
->loop_or_switch_nesting
= nesting
;
3465 state
->loop_or_switch_nesting_ast
= nesting_ast
;
3467 /* Loops do not have r-values.
3474 ast_type_specifier::hir(exec_list
*instructions
,
3475 struct _mesa_glsl_parse_state
*state
)
3477 if (!this->is_precision_statement
&& this->structure
== NULL
)
3480 YYLTYPE loc
= this->get_location();
3482 if (this->precision
!= ast_precision_none
3483 && state
->language_version
!= 100
3484 && state
->language_version
< 130) {
3485 _mesa_glsl_error(&loc
, state
,
3486 "precision qualifiers exist only in "
3487 "GLSL ES 1.00, and GLSL 1.30 and later");
3490 if (this->precision
!= ast_precision_none
3491 && this->structure
!= NULL
) {
3492 _mesa_glsl_error(&loc
, state
,
3493 "precision qualifiers do not apply to structures");
3497 /* If this is a precision statement, check that the type to which it is
3498 * applied is either float or int.
3500 * From section 4.5.3 of the GLSL 1.30 spec:
3501 * "The precision statement
3502 * precision precision-qualifier type;
3503 * can be used to establish a default precision qualifier. The type
3504 * field can be either int or float [...]. Any other types or
3505 * qualifiers will result in an error.
3507 if (this->is_precision_statement
) {
3508 assert(this->precision
!= ast_precision_none
);
3509 assert(this->structure
== NULL
); /* The check for structures was
3510 * performed above. */
3511 if (this->is_array
) {
3512 _mesa_glsl_error(&loc
, state
,
3513 "default precision statements do not apply to "
3517 if (this->type_specifier
!= ast_float
3518 && this->type_specifier
!= ast_int
) {
3519 _mesa_glsl_error(&loc
, state
,
3520 "default precision statements apply only to types "
3525 /* FINISHME: Translate precision statements into IR. */
3529 if (this->structure
!= NULL
)
3530 return this->structure
->hir(instructions
, state
);
3537 ast_struct_specifier::hir(exec_list
*instructions
,
3538 struct _mesa_glsl_parse_state
*state
)
3540 unsigned decl_count
= 0;
3542 /* Make an initial pass over the list of structure fields to determine how
3543 * many there are. Each element in this list is an ast_declarator_list.
3544 * This means that we actually need to count the number of elements in the
3545 * 'declarations' list in each of the elements.
3547 foreach_list_typed (ast_declarator_list
, decl_list
, link
,
3548 &this->declarations
) {
3549 foreach_list_const (decl_ptr
, & decl_list
->declarations
) {
3554 /* Allocate storage for the structure fields and process the field
3555 * declarations. As the declarations are processed, try to also convert
3556 * the types to HIR. This ensures that structure definitions embedded in
3557 * other structure definitions are processed.
3559 glsl_struct_field
*const fields
= ralloc_array(state
, glsl_struct_field
,
3563 foreach_list_typed (ast_declarator_list
, decl_list
, link
,
3564 &this->declarations
) {
3565 const char *type_name
;
3567 decl_list
->type
->specifier
->hir(instructions
, state
);
3569 /* Section 10.9 of the GLSL ES 1.00 specification states that
3570 * embedded structure definitions have been removed from the language.
3572 if (state
->es_shader
&& decl_list
->type
->specifier
->structure
!= NULL
) {
3573 YYLTYPE loc
= this->get_location();
3574 _mesa_glsl_error(&loc
, state
, "Embedded structure definitions are "
3575 "not allowed in GLSL ES 1.00.");
3578 const glsl_type
*decl_type
=
3579 decl_list
->type
->specifier
->glsl_type(& type_name
, state
);
3581 foreach_list_typed (ast_declaration
, decl
, link
,
3582 &decl_list
->declarations
) {
3583 const struct glsl_type
*field_type
= decl_type
;
3584 if (decl
->is_array
) {
3585 YYLTYPE loc
= decl
->get_location();
3586 field_type
= process_array_type(&loc
, decl_type
, decl
->array_size
,
3589 fields
[i
].type
= (field_type
!= NULL
)
3590 ? field_type
: glsl_type::error_type
;
3591 fields
[i
].name
= decl
->identifier
;
3596 assert(i
== decl_count
);
3598 const glsl_type
*t
=
3599 glsl_type::get_record_instance(fields
, decl_count
, this->name
);
3601 YYLTYPE loc
= this->get_location();
3602 if (!state
->symbols
->add_type(name
, t
)) {
3603 _mesa_glsl_error(& loc
, state
, "struct `%s' previously defined", name
);
3605 const glsl_type
**s
= reralloc(state
, state
->user_structures
,
3607 state
->num_user_structures
+ 1);
3609 s
[state
->num_user_structures
] = t
;
3610 state
->user_structures
= s
;
3611 state
->num_user_structures
++;
3615 /* Structure type definitions do not have r-values.