2 * Copyright © 2010 Intel Corporation
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
21 * DEALINGS IN THE SOFTWARE.
26 * Convert abstract syntax to to high-level intermediate reprensentation (HIR).
28 * During the conversion to HIR, the majority of the symantic checking is
29 * preformed on the program. This includes:
31 * * Symbol table management
35 * The majority of this work could be done during parsing, and the parser could
36 * probably generate HIR directly. However, this results in frequent changes
37 * to the parser code. Since we do not assume that every system this complier
38 * is built on will have Flex and Bison installed, we have to store the code
39 * generated by these tools in our version control system. In other parts of
40 * the system we've seen problems where a parser was changed but the generated
41 * code was not committed, merge conflicts where created because two developers
42 * had slightly different versions of Bison installed, etc.
44 * I have also noticed that running Bison generated parsers in GDB is very
45 * irritating. When you get a segfault on '$$ = $1->foo', you can't very
46 * well 'print $1' in GDB.
48 * As a result, my preference is to put as little C code as possible in the
49 * parser (and lexer) sources.
52 #include "main/core.h" /* for struct gl_extensions */
53 #include "glsl_symbol_table.h"
54 #include "glsl_parser_extras.h"
56 #include "glsl_types.h"
57 #include "program/hash_table.h"
61 detect_conflicting_assignments(struct _mesa_glsl_parse_state
*state
,
62 exec_list
*instructions
);
65 _mesa_ast_to_hir(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
)
67 _mesa_glsl_initialize_variables(instructions
, state
);
69 state
->symbols
->language_version
= state
->language_version
;
71 state
->current_function
= NULL
;
73 state
->toplevel_ir
= instructions
;
75 /* Section 4.2 of the GLSL 1.20 specification states:
76 * "The built-in functions are scoped in a scope outside the global scope
77 * users declare global variables in. That is, a shader's global scope,
78 * available for user-defined functions and global variables, is nested
79 * inside the scope containing the built-in functions."
81 * Since built-in functions like ftransform() access built-in variables,
82 * it follows that those must be in the outer scope as well.
84 * We push scope here to create this nesting effect...but don't pop.
85 * This way, a shader's globals are still in the symbol table for use
88 state
->symbols
->push_scope();
90 foreach_list_typed (ast_node
, ast
, link
, & state
->translation_unit
)
91 ast
->hir(instructions
, state
);
93 detect_recursion_unlinked(state
, instructions
);
94 detect_conflicting_assignments(state
, instructions
);
96 state
->toplevel_ir
= NULL
;
101 * If a conversion is available, convert one operand to a different type
103 * The \c from \c ir_rvalue is converted "in place".
105 * \param to Type that the operand it to be converted to
106 * \param from Operand that is being converted
107 * \param state GLSL compiler state
110 * If a conversion is possible (or unnecessary), \c true is returned.
111 * Otherwise \c false is returned.
114 apply_implicit_conversion(const glsl_type
*to
, ir_rvalue
* &from
,
115 struct _mesa_glsl_parse_state
*state
)
118 if (to
->base_type
== from
->type
->base_type
)
121 /* This conversion was added in GLSL 1.20. If the compilation mode is
122 * GLSL 1.10, the conversion is skipped.
124 if (state
->language_version
< 120)
127 /* From page 27 (page 33 of the PDF) of the GLSL 1.50 spec:
129 * "There are no implicit array or structure conversions. For
130 * example, an array of int cannot be implicitly converted to an
131 * array of float. There are no implicit conversions between
132 * signed and unsigned integers."
134 /* FINISHME: The above comment is partially a lie. There is int/uint
135 * FINISHME: conversion for immediate constants.
137 if (!to
->is_float() || !from
->type
->is_numeric())
140 /* Convert to a floating point type with the same number of components
141 * as the original type - i.e. int to float, not int to vec4.
143 to
= glsl_type::get_instance(GLSL_TYPE_FLOAT
, from
->type
->vector_elements
,
144 from
->type
->matrix_columns
);
146 switch (from
->type
->base_type
) {
148 from
= new(ctx
) ir_expression(ir_unop_i2f
, to
, from
, NULL
);
151 from
= new(ctx
) ir_expression(ir_unop_u2f
, to
, from
, NULL
);
154 from
= new(ctx
) ir_expression(ir_unop_b2f
, to
, from
, NULL
);
164 static const struct glsl_type
*
165 arithmetic_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
167 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
169 const glsl_type
*type_a
= value_a
->type
;
170 const glsl_type
*type_b
= value_b
->type
;
172 /* From GLSL 1.50 spec, page 56:
174 * "The arithmetic binary operators add (+), subtract (-),
175 * multiply (*), and divide (/) operate on integer and
176 * floating-point scalars, vectors, and matrices."
178 if (!type_a
->is_numeric() || !type_b
->is_numeric()) {
179 _mesa_glsl_error(loc
, state
,
180 "Operands to arithmetic operators must be numeric");
181 return glsl_type::error_type
;
185 /* "If one operand is floating-point based and the other is
186 * not, then the conversions from Section 4.1.10 "Implicit
187 * Conversions" are applied to the non-floating-point-based operand."
189 if (!apply_implicit_conversion(type_a
, value_b
, state
)
190 && !apply_implicit_conversion(type_b
, value_a
, state
)) {
191 _mesa_glsl_error(loc
, state
,
192 "Could not implicitly convert operands to "
193 "arithmetic operator");
194 return glsl_type::error_type
;
196 type_a
= value_a
->type
;
197 type_b
= value_b
->type
;
199 /* "If the operands are integer types, they must both be signed or
202 * From this rule and the preceeding conversion it can be inferred that
203 * both types must be GLSL_TYPE_FLOAT, or GLSL_TYPE_UINT, or GLSL_TYPE_INT.
204 * The is_numeric check above already filtered out the case where either
205 * type is not one of these, so now the base types need only be tested for
208 if (type_a
->base_type
!= type_b
->base_type
) {
209 _mesa_glsl_error(loc
, state
,
210 "base type mismatch for arithmetic operator");
211 return glsl_type::error_type
;
214 /* "All arithmetic binary operators result in the same fundamental type
215 * (signed integer, unsigned integer, or floating-point) as the
216 * operands they operate on, after operand type conversion. After
217 * conversion, the following cases are valid
219 * * The two operands are scalars. In this case the operation is
220 * applied, resulting in a scalar."
222 if (type_a
->is_scalar() && type_b
->is_scalar())
225 /* "* One operand is a scalar, and the other is a vector or matrix.
226 * In this case, the scalar operation is applied independently to each
227 * component of the vector or matrix, resulting in the same size
230 if (type_a
->is_scalar()) {
231 if (!type_b
->is_scalar())
233 } else if (type_b
->is_scalar()) {
237 /* All of the combinations of <scalar, scalar>, <vector, scalar>,
238 * <scalar, vector>, <scalar, matrix>, and <matrix, scalar> have been
241 assert(!type_a
->is_scalar());
242 assert(!type_b
->is_scalar());
244 /* "* The two operands are vectors of the same size. In this case, the
245 * operation is done component-wise resulting in the same size
248 if (type_a
->is_vector() && type_b
->is_vector()) {
249 if (type_a
== type_b
) {
252 _mesa_glsl_error(loc
, state
,
253 "vector size mismatch for arithmetic operator");
254 return glsl_type::error_type
;
258 /* All of the combinations of <scalar, scalar>, <vector, scalar>,
259 * <scalar, vector>, <scalar, matrix>, <matrix, scalar>, and
260 * <vector, vector> have been handled. At least one of the operands must
261 * be matrix. Further, since there are no integer matrix types, the base
262 * type of both operands must be float.
264 assert(type_a
->is_matrix() || type_b
->is_matrix());
265 assert(type_a
->base_type
== GLSL_TYPE_FLOAT
);
266 assert(type_b
->base_type
== GLSL_TYPE_FLOAT
);
268 /* "* The operator is add (+), subtract (-), or divide (/), and the
269 * operands are matrices with the same number of rows and the same
270 * number of columns. In this case, the operation is done component-
271 * wise resulting in the same size matrix."
272 * * The operator is multiply (*), where both operands are matrices or
273 * one operand is a vector and the other a matrix. A right vector
274 * operand is treated as a column vector and a left vector operand as a
275 * row vector. In all these cases, it is required that the number of
276 * columns of the left operand is equal to the number of rows of the
277 * right operand. Then, the multiply (*) operation does a linear
278 * algebraic multiply, yielding an object that has the same number of
279 * rows as the left operand and the same number of columns as the right
280 * operand. Section 5.10 "Vector and Matrix Operations" explains in
281 * more detail how vectors and matrices are operated on."
284 if (type_a
== type_b
)
287 if (type_a
->is_matrix() && type_b
->is_matrix()) {
288 /* Matrix multiply. The columns of A must match the rows of B. Given
289 * the other previously tested constraints, this means the vector type
290 * of a row from A must be the same as the vector type of a column from
293 if (type_a
->row_type() == type_b
->column_type()) {
294 /* The resulting matrix has the number of columns of matrix B and
295 * the number of rows of matrix A. We get the row count of A by
296 * looking at the size of a vector that makes up a column. The
297 * transpose (size of a row) is done for B.
299 const glsl_type
*const type
=
300 glsl_type::get_instance(type_a
->base_type
,
301 type_a
->column_type()->vector_elements
,
302 type_b
->row_type()->vector_elements
);
303 assert(type
!= glsl_type::error_type
);
307 } else if (type_a
->is_matrix()) {
308 /* A is a matrix and B is a column vector. Columns of A must match
309 * rows of B. Given the other previously tested constraints, this
310 * means the vector type of a row from A must be the same as the
311 * vector the type of B.
313 if (type_a
->row_type() == type_b
) {
314 /* The resulting vector has a number of elements equal to
315 * the number of rows of matrix A. */
316 const glsl_type
*const type
=
317 glsl_type::get_instance(type_a
->base_type
,
318 type_a
->column_type()->vector_elements
,
320 assert(type
!= glsl_type::error_type
);
325 assert(type_b
->is_matrix());
327 /* A is a row vector and B is a matrix. Columns of A must match rows
328 * of B. Given the other previously tested constraints, this means
329 * the type of A must be the same as the vector type of a column from
332 if (type_a
== type_b
->column_type()) {
333 /* The resulting vector has a number of elements equal to
334 * the number of columns of matrix B. */
335 const glsl_type
*const type
=
336 glsl_type::get_instance(type_a
->base_type
,
337 type_b
->row_type()->vector_elements
,
339 assert(type
!= glsl_type::error_type
);
345 _mesa_glsl_error(loc
, state
, "size mismatch for matrix multiplication");
346 return glsl_type::error_type
;
350 /* "All other cases are illegal."
352 _mesa_glsl_error(loc
, state
, "type mismatch");
353 return glsl_type::error_type
;
357 static const struct glsl_type
*
358 unary_arithmetic_result_type(const struct glsl_type
*type
,
359 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
361 /* From GLSL 1.50 spec, page 57:
363 * "The arithmetic unary operators negate (-), post- and pre-increment
364 * and decrement (-- and ++) operate on integer or floating-point
365 * values (including vectors and matrices). All unary operators work
366 * component-wise on their operands. These result with the same type
369 if (!type
->is_numeric()) {
370 _mesa_glsl_error(loc
, state
,
371 "Operands to arithmetic operators must be numeric");
372 return glsl_type::error_type
;
379 * \brief Return the result type of a bit-logic operation.
381 * If the given types to the bit-logic operator are invalid, return
382 * glsl_type::error_type.
384 * \param type_a Type of LHS of bit-logic op
385 * \param type_b Type of RHS of bit-logic op
387 static const struct glsl_type
*
388 bit_logic_result_type(const struct glsl_type
*type_a
,
389 const struct glsl_type
*type_b
,
391 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
393 if (state
->language_version
< 130) {
394 _mesa_glsl_error(loc
, state
, "bit operations require GLSL 1.30");
395 return glsl_type::error_type
;
398 /* From page 50 (page 56 of PDF) of GLSL 1.30 spec:
400 * "The bitwise operators and (&), exclusive-or (^), and inclusive-or
401 * (|). The operands must be of type signed or unsigned integers or
404 if (!type_a
->is_integer()) {
405 _mesa_glsl_error(loc
, state
, "LHS of `%s' must be an integer",
406 ast_expression::operator_string(op
));
407 return glsl_type::error_type
;
409 if (!type_b
->is_integer()) {
410 _mesa_glsl_error(loc
, state
, "RHS of `%s' must be an integer",
411 ast_expression::operator_string(op
));
412 return glsl_type::error_type
;
415 /* "The fundamental types of the operands (signed or unsigned) must
418 if (type_a
->base_type
!= type_b
->base_type
) {
419 _mesa_glsl_error(loc
, state
, "operands of `%s' must have the same "
420 "base type", ast_expression::operator_string(op
));
421 return glsl_type::error_type
;
424 /* "The operands cannot be vectors of differing size." */
425 if (type_a
->is_vector() &&
426 type_b
->is_vector() &&
427 type_a
->vector_elements
!= type_b
->vector_elements
) {
428 _mesa_glsl_error(loc
, state
, "operands of `%s' cannot be vectors of "
429 "different sizes", ast_expression::operator_string(op
));
430 return glsl_type::error_type
;
433 /* "If one operand is a scalar and the other a vector, the scalar is
434 * applied component-wise to the vector, resulting in the same type as
435 * the vector. The fundamental types of the operands [...] will be the
436 * resulting fundamental type."
438 if (type_a
->is_scalar())
444 static const struct glsl_type
*
445 modulus_result_type(const struct glsl_type
*type_a
,
446 const struct glsl_type
*type_b
,
447 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
449 if (state
->language_version
< 130) {
450 _mesa_glsl_error(loc
, state
,
451 "operator '%%' is reserved in %s",
452 state
->version_string
);
453 return glsl_type::error_type
;
456 /* From GLSL 1.50 spec, page 56:
457 * "The operator modulus (%) operates on signed or unsigned integers or
458 * integer vectors. The operand types must both be signed or both be
461 if (!type_a
->is_integer()) {
462 _mesa_glsl_error(loc
, state
, "LHS of operator %% must be an integer.");
463 return glsl_type::error_type
;
465 if (!type_b
->is_integer()) {
466 _mesa_glsl_error(loc
, state
, "RHS of operator %% must be an integer.");
467 return glsl_type::error_type
;
469 if (type_a
->base_type
!= type_b
->base_type
) {
470 _mesa_glsl_error(loc
, state
,
471 "operands of %% must have the same base type");
472 return glsl_type::error_type
;
475 /* "The operands cannot be vectors of differing size. If one operand is
476 * a scalar and the other vector, then the scalar is applied component-
477 * wise to the vector, resulting in the same type as the vector. If both
478 * are vectors of the same size, the result is computed component-wise."
480 if (type_a
->is_vector()) {
481 if (!type_b
->is_vector()
482 || (type_a
->vector_elements
== type_b
->vector_elements
))
487 /* "The operator modulus (%) is not defined for any other data types
488 * (non-integer types)."
490 _mesa_glsl_error(loc
, state
, "type mismatch");
491 return glsl_type::error_type
;
495 static const struct glsl_type
*
496 relational_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
497 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
499 const glsl_type
*type_a
= value_a
->type
;
500 const glsl_type
*type_b
= value_b
->type
;
502 /* From GLSL 1.50 spec, page 56:
503 * "The relational operators greater than (>), less than (<), greater
504 * than or equal (>=), and less than or equal (<=) operate only on
505 * scalar integer and scalar floating-point expressions."
507 if (!type_a
->is_numeric()
508 || !type_b
->is_numeric()
509 || !type_a
->is_scalar()
510 || !type_b
->is_scalar()) {
511 _mesa_glsl_error(loc
, state
,
512 "Operands to relational operators must be scalar and "
514 return glsl_type::error_type
;
517 /* "Either the operands' types must match, or the conversions from
518 * Section 4.1.10 "Implicit Conversions" will be applied to the integer
519 * operand, after which the types must match."
521 if (!apply_implicit_conversion(type_a
, value_b
, state
)
522 && !apply_implicit_conversion(type_b
, value_a
, state
)) {
523 _mesa_glsl_error(loc
, state
,
524 "Could not implicitly convert operands to "
525 "relational operator");
526 return glsl_type::error_type
;
528 type_a
= value_a
->type
;
529 type_b
= value_b
->type
;
531 if (type_a
->base_type
!= type_b
->base_type
) {
532 _mesa_glsl_error(loc
, state
, "base type mismatch");
533 return glsl_type::error_type
;
536 /* "The result is scalar Boolean."
538 return glsl_type::bool_type
;
542 * \brief Return the result type of a bit-shift operation.
544 * If the given types to the bit-shift operator are invalid, return
545 * glsl_type::error_type.
547 * \param type_a Type of LHS of bit-shift op
548 * \param type_b Type of RHS of bit-shift op
550 static const struct glsl_type
*
551 shift_result_type(const struct glsl_type
*type_a
,
552 const struct glsl_type
*type_b
,
554 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
556 if (state
->language_version
< 130) {
557 _mesa_glsl_error(loc
, state
, "bit operations require GLSL 1.30");
558 return glsl_type::error_type
;
561 /* From page 50 (page 56 of the PDF) of the GLSL 1.30 spec:
563 * "The shift operators (<<) and (>>). For both operators, the operands
564 * must be signed or unsigned integers or integer vectors. One operand
565 * can be signed while the other is unsigned."
567 if (!type_a
->is_integer()) {
568 _mesa_glsl_error(loc
, state
, "LHS of operator %s must be an integer or "
569 "integer vector", ast_expression::operator_string(op
));
570 return glsl_type::error_type
;
573 if (!type_b
->is_integer()) {
574 _mesa_glsl_error(loc
, state
, "RHS of operator %s must be an integer or "
575 "integer vector", ast_expression::operator_string(op
));
576 return glsl_type::error_type
;
579 /* "If the first operand is a scalar, the second operand has to be
582 if (type_a
->is_scalar() && !type_b
->is_scalar()) {
583 _mesa_glsl_error(loc
, state
, "If the first operand of %s is scalar, the "
584 "second must be scalar as well",
585 ast_expression::operator_string(op
));
586 return glsl_type::error_type
;
589 /* If both operands are vectors, check that they have same number of
592 if (type_a
->is_vector() &&
593 type_b
->is_vector() &&
594 type_a
->vector_elements
!= type_b
->vector_elements
) {
595 _mesa_glsl_error(loc
, state
, "Vector operands to operator %s must "
596 "have same number of elements",
597 ast_expression::operator_string(op
));
598 return glsl_type::error_type
;
601 /* "In all cases, the resulting type will be the same type as the left
608 * Validates that a value can be assigned to a location with a specified type
610 * Validates that \c rhs can be assigned to some location. If the types are
611 * not an exact match but an automatic conversion is possible, \c rhs will be
615 * \c NULL if \c rhs cannot be assigned to a location with type \c lhs_type.
616 * Otherwise the actual RHS to be assigned will be returned. This may be
617 * \c rhs, or it may be \c rhs after some type conversion.
620 * In addition to being used for assignments, this function is used to
621 * type-check return values.
624 validate_assignment(struct _mesa_glsl_parse_state
*state
,
625 const glsl_type
*lhs_type
, ir_rvalue
*rhs
,
628 /* If there is already some error in the RHS, just return it. Anything
629 * else will lead to an avalanche of error message back to the user.
631 if (rhs
->type
->is_error())
634 /* If the types are identical, the assignment can trivially proceed.
636 if (rhs
->type
== lhs_type
)
639 /* If the array element types are the same and the size of the LHS is zero,
640 * the assignment is okay for initializers embedded in variable
643 * Note: Whole-array assignments are not permitted in GLSL 1.10, but this
644 * is handled by ir_dereference::is_lvalue.
646 if (is_initializer
&& lhs_type
->is_array() && rhs
->type
->is_array()
647 && (lhs_type
->element_type() == rhs
->type
->element_type())
648 && (lhs_type
->array_size() == 0)) {
652 /* Check for implicit conversion in GLSL 1.20 */
653 if (apply_implicit_conversion(lhs_type
, rhs
, state
)) {
654 if (rhs
->type
== lhs_type
)
662 mark_whole_array_access(ir_rvalue
*access
)
664 ir_dereference_variable
*deref
= access
->as_dereference_variable();
666 if (deref
&& deref
->var
) {
667 deref
->var
->max_array_access
= deref
->type
->length
- 1;
672 do_assignment(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
,
673 const char *non_lvalue_description
,
674 ir_rvalue
*lhs
, ir_rvalue
*rhs
, bool is_initializer
,
678 bool error_emitted
= (lhs
->type
->is_error() || rhs
->type
->is_error());
680 ir_variable
*lhs_var
= lhs
->variable_referenced();
682 lhs_var
->assigned
= true;
684 if (!error_emitted
) {
685 if (non_lvalue_description
!= NULL
) {
686 _mesa_glsl_error(&lhs_loc
, state
,
688 non_lvalue_description
);
689 error_emitted
= true;
690 } else if (lhs
->variable_referenced() != NULL
691 && lhs
->variable_referenced()->read_only
) {
692 _mesa_glsl_error(&lhs_loc
, state
,
693 "assignment to read-only variable '%s'",
694 lhs
->variable_referenced()->name
);
695 error_emitted
= true;
697 } else if (state
->language_version
<= 110 && lhs
->type
->is_array()) {
698 /* From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
700 * "Other binary or unary expressions, non-dereferenced
701 * arrays, function names, swizzles with repeated fields,
702 * and constants cannot be l-values."
704 _mesa_glsl_error(&lhs_loc
, state
, "whole array assignment is not "
705 "allowed in GLSL 1.10 or GLSL ES 1.00.");
706 error_emitted
= true;
707 } else if (!lhs
->is_lvalue()) {
708 _mesa_glsl_error(& lhs_loc
, state
, "non-lvalue in assignment");
709 error_emitted
= true;
714 validate_assignment(state
, lhs
->type
, rhs
, is_initializer
);
715 if (new_rhs
== NULL
) {
716 _mesa_glsl_error(& lhs_loc
, state
, "type mismatch");
720 /* If the LHS array was not declared with a size, it takes it size from
721 * the RHS. If the LHS is an l-value and a whole array, it must be a
722 * dereference of a variable. Any other case would require that the LHS
723 * is either not an l-value or not a whole array.
725 if (lhs
->type
->array_size() == 0) {
726 ir_dereference
*const d
= lhs
->as_dereference();
730 ir_variable
*const var
= d
->variable_referenced();
734 if (var
->max_array_access
>= unsigned(rhs
->type
->array_size())) {
735 /* FINISHME: This should actually log the location of the RHS. */
736 _mesa_glsl_error(& lhs_loc
, state
, "array size must be > %u due to "
738 var
->max_array_access
);
741 var
->type
= glsl_type::get_array_instance(lhs
->type
->element_type(),
742 rhs
->type
->array_size());
745 mark_whole_array_access(rhs
);
746 mark_whole_array_access(lhs
);
749 /* Most callers of do_assignment (assign, add_assign, pre_inc/dec,
750 * but not post_inc) need the converted assigned value as an rvalue
751 * to handle things like:
755 * So we always just store the computed value being assigned to a
756 * temporary and return a deref of that temporary. If the rvalue
757 * ends up not being used, the temp will get copy-propagated out.
759 ir_variable
*var
= new(ctx
) ir_variable(rhs
->type
, "assignment_tmp",
761 ir_dereference_variable
*deref_var
= new(ctx
) ir_dereference_variable(var
);
762 instructions
->push_tail(var
);
763 instructions
->push_tail(new(ctx
) ir_assignment(deref_var
,
766 deref_var
= new(ctx
) ir_dereference_variable(var
);
769 instructions
->push_tail(new(ctx
) ir_assignment(lhs
, deref_var
, NULL
));
771 return new(ctx
) ir_dereference_variable(var
);
775 get_lvalue_copy(exec_list
*instructions
, ir_rvalue
*lvalue
)
777 void *ctx
= ralloc_parent(lvalue
);
780 var
= new(ctx
) ir_variable(lvalue
->type
, "_post_incdec_tmp",
782 instructions
->push_tail(var
);
783 var
->mode
= ir_var_auto
;
785 instructions
->push_tail(new(ctx
) ir_assignment(new(ctx
) ir_dereference_variable(var
),
788 return new(ctx
) ir_dereference_variable(var
);
793 ast_node::hir(exec_list
*instructions
,
794 struct _mesa_glsl_parse_state
*state
)
803 do_comparison(void *mem_ctx
, int operation
, ir_rvalue
*op0
, ir_rvalue
*op1
)
806 ir_rvalue
*cmp
= NULL
;
808 if (operation
== ir_binop_all_equal
)
809 join_op
= ir_binop_logic_and
;
811 join_op
= ir_binop_logic_or
;
813 switch (op0
->type
->base_type
) {
814 case GLSL_TYPE_FLOAT
:
818 return new(mem_ctx
) ir_expression(operation
, op0
, op1
);
820 case GLSL_TYPE_ARRAY
: {
821 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
822 ir_rvalue
*e0
, *e1
, *result
;
824 e0
= new(mem_ctx
) ir_dereference_array(op0
->clone(mem_ctx
, NULL
),
825 new(mem_ctx
) ir_constant(i
));
826 e1
= new(mem_ctx
) ir_dereference_array(op1
->clone(mem_ctx
, NULL
),
827 new(mem_ctx
) ir_constant(i
));
828 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
831 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
837 mark_whole_array_access(op0
);
838 mark_whole_array_access(op1
);
842 case GLSL_TYPE_STRUCT
: {
843 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
844 ir_rvalue
*e0
, *e1
, *result
;
845 const char *field_name
= op0
->type
->fields
.structure
[i
].name
;
847 e0
= new(mem_ctx
) ir_dereference_record(op0
->clone(mem_ctx
, NULL
),
849 e1
= new(mem_ctx
) ir_dereference_record(op1
->clone(mem_ctx
, NULL
),
851 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
854 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
862 case GLSL_TYPE_ERROR
:
864 case GLSL_TYPE_SAMPLER
:
865 /* I assume a comparison of a struct containing a sampler just
866 * ignores the sampler present in the type.
871 assert(!"Should not get here.");
876 cmp
= new(mem_ctx
) ir_constant(true);
881 /* For logical operations, we want to ensure that the operands are
882 * scalar booleans. If it isn't, emit an error and return a constant
883 * boolean to avoid triggering cascading error messages.
886 get_scalar_boolean_operand(exec_list
*instructions
,
887 struct _mesa_glsl_parse_state
*state
,
888 ast_expression
*parent_expr
,
890 const char *operand_name
,
893 ast_expression
*expr
= parent_expr
->subexpressions
[operand
];
895 ir_rvalue
*val
= expr
->hir(instructions
, state
);
897 if (val
->type
->is_boolean() && val
->type
->is_scalar())
900 if (!*error_emitted
) {
901 YYLTYPE loc
= expr
->get_location();
902 _mesa_glsl_error(&loc
, state
, "%s of `%s' must be scalar boolean",
904 parent_expr
->operator_string(parent_expr
->oper
));
905 *error_emitted
= true;
908 return new(ctx
) ir_constant(true);
912 * If name refers to a builtin array whose maximum allowed size is less than
913 * size, report an error and return true. Otherwise return false.
916 check_builtin_array_max_size(const char *name
, unsigned size
,
917 YYLTYPE loc
, struct _mesa_glsl_parse_state
*state
)
919 if ((strcmp("gl_TexCoord", name
) == 0)
920 && (size
> state
->Const
.MaxTextureCoords
)) {
921 /* From page 54 (page 60 of the PDF) of the GLSL 1.20 spec:
923 * "The size [of gl_TexCoord] can be at most
924 * gl_MaxTextureCoords."
926 _mesa_glsl_error(&loc
, state
, "`gl_TexCoord' array size cannot "
927 "be larger than gl_MaxTextureCoords (%u)\n",
928 state
->Const
.MaxTextureCoords
);
930 } else if (strcmp("gl_ClipDistance", name
) == 0
931 && size
> state
->Const
.MaxClipPlanes
) {
932 /* From section 7.1 (Vertex Shader Special Variables) of the
935 * "The gl_ClipDistance array is predeclared as unsized and
936 * must be sized by the shader either redeclaring it with a
937 * size or indexing it only with integral constant
938 * expressions. ... The size can be at most
939 * gl_MaxClipDistances."
941 _mesa_glsl_error(&loc
, state
, "`gl_ClipDistance' array size cannot "
942 "be larger than gl_MaxClipDistances (%u)\n",
943 state
->Const
.MaxClipPlanes
);
950 * Create the constant 1, of a which is appropriate for incrementing and
951 * decrementing values of the given GLSL type. For example, if type is vec4,
952 * this creates a constant value of 1.0 having type float.
954 * If the given type is invalid for increment and decrement operators, return
955 * a floating point 1--the error will be detected later.
958 constant_one_for_inc_dec(void *ctx
, const glsl_type
*type
)
960 switch (type
->base_type
) {
962 return new(ctx
) ir_constant((unsigned) 1);
964 return new(ctx
) ir_constant(1);
966 case GLSL_TYPE_FLOAT
:
967 return new(ctx
) ir_constant(1.0f
);
972 ast_expression::hir(exec_list
*instructions
,
973 struct _mesa_glsl_parse_state
*state
)
976 static const int operations
[AST_NUM_OPERATORS
] = {
977 -1, /* ast_assign doesn't convert to ir_expression. */
978 -1, /* ast_plus doesn't convert to ir_expression. */
1002 /* Note: The following block of expression types actually convert
1003 * to multiple IR instructions.
1005 ir_binop_mul
, /* ast_mul_assign */
1006 ir_binop_div
, /* ast_div_assign */
1007 ir_binop_mod
, /* ast_mod_assign */
1008 ir_binop_add
, /* ast_add_assign */
1009 ir_binop_sub
, /* ast_sub_assign */
1010 ir_binop_lshift
, /* ast_ls_assign */
1011 ir_binop_rshift
, /* ast_rs_assign */
1012 ir_binop_bit_and
, /* ast_and_assign */
1013 ir_binop_bit_xor
, /* ast_xor_assign */
1014 ir_binop_bit_or
, /* ast_or_assign */
1016 -1, /* ast_conditional doesn't convert to ir_expression. */
1017 ir_binop_add
, /* ast_pre_inc. */
1018 ir_binop_sub
, /* ast_pre_dec. */
1019 ir_binop_add
, /* ast_post_inc. */
1020 ir_binop_sub
, /* ast_post_dec. */
1021 -1, /* ast_field_selection doesn't conv to ir_expression. */
1022 -1, /* ast_array_index doesn't convert to ir_expression. */
1023 -1, /* ast_function_call doesn't conv to ir_expression. */
1024 -1, /* ast_identifier doesn't convert to ir_expression. */
1025 -1, /* ast_int_constant doesn't convert to ir_expression. */
1026 -1, /* ast_uint_constant doesn't conv to ir_expression. */
1027 -1, /* ast_float_constant doesn't conv to ir_expression. */
1028 -1, /* ast_bool_constant doesn't conv to ir_expression. */
1029 -1, /* ast_sequence doesn't convert to ir_expression. */
1031 ir_rvalue
*result
= NULL
;
1033 const struct glsl_type
*type
; /* a temporary variable for switch cases */
1034 bool error_emitted
= false;
1037 loc
= this->get_location();
1039 switch (this->oper
) {
1041 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1042 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1044 result
= do_assignment(instructions
, state
,
1045 this->subexpressions
[0]->non_lvalue_description
,
1046 op
[0], op
[1], false,
1047 this->subexpressions
[0]->get_location());
1048 error_emitted
= result
->type
->is_error();
1053 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1055 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1057 error_emitted
= type
->is_error();
1063 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1065 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1067 error_emitted
= type
->is_error();
1069 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1077 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1078 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1080 type
= arithmetic_result_type(op
[0], op
[1],
1081 (this->oper
== ast_mul
),
1083 error_emitted
= type
->is_error();
1085 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1090 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1091 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1093 type
= modulus_result_type(op
[0]->type
, op
[1]->type
, state
, & loc
);
1095 assert(operations
[this->oper
] == ir_binop_mod
);
1097 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1099 error_emitted
= type
->is_error();
1104 if (state
->language_version
< 130) {
1105 _mesa_glsl_error(&loc
, state
, "operator %s requires GLSL 1.30",
1106 operator_string(this->oper
));
1107 error_emitted
= true;
1110 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1111 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1112 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1114 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1116 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1123 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1124 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1126 type
= relational_result_type(op
[0], op
[1], state
, & loc
);
1128 /* The relational operators must either generate an error or result
1129 * in a scalar boolean. See page 57 of the GLSL 1.50 spec.
1131 assert(type
->is_error()
1132 || ((type
->base_type
== GLSL_TYPE_BOOL
)
1133 && type
->is_scalar()));
1135 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1137 error_emitted
= type
->is_error();
1142 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1143 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1145 /* From page 58 (page 64 of the PDF) of the GLSL 1.50 spec:
1147 * "The equality operators equal (==), and not equal (!=)
1148 * operate on all types. They result in a scalar Boolean. If
1149 * the operand types do not match, then there must be a
1150 * conversion from Section 4.1.10 "Implicit Conversions"
1151 * applied to one operand that can make them match, in which
1152 * case this conversion is done."
1154 if ((!apply_implicit_conversion(op
[0]->type
, op
[1], state
)
1155 && !apply_implicit_conversion(op
[1]->type
, op
[0], state
))
1156 || (op
[0]->type
!= op
[1]->type
)) {
1157 _mesa_glsl_error(& loc
, state
, "operands of `%s' must have the same "
1158 "type", (this->oper
== ast_equal
) ? "==" : "!=");
1159 error_emitted
= true;
1160 } else if ((state
->language_version
<= 110)
1161 && (op
[0]->type
->is_array() || op
[1]->type
->is_array())) {
1162 _mesa_glsl_error(& loc
, state
, "array comparisons forbidden in "
1164 error_emitted
= true;
1167 if (error_emitted
) {
1168 result
= new(ctx
) ir_constant(false);
1170 result
= do_comparison(ctx
, operations
[this->oper
], op
[0], op
[1]);
1171 assert(result
->type
== glsl_type::bool_type
);
1178 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1179 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1180 type
= bit_logic_result_type(op
[0]->type
, op
[1]->type
, this->oper
,
1182 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1184 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1188 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1190 if (state
->language_version
< 130) {
1191 _mesa_glsl_error(&loc
, state
, "bit-wise operations require GLSL 1.30");
1192 error_emitted
= true;
1195 if (!op
[0]->type
->is_integer()) {
1196 _mesa_glsl_error(&loc
, state
, "operand of `~' must be an integer");
1197 error_emitted
= true;
1200 type
= error_emitted
? glsl_type::error_type
: op
[0]->type
;
1201 result
= new(ctx
) ir_expression(ir_unop_bit_not
, type
, op
[0], NULL
);
1204 case ast_logic_and
: {
1205 exec_list rhs_instructions
;
1206 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1207 "LHS", &error_emitted
);
1208 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1209 "RHS", &error_emitted
);
1211 if (rhs_instructions
.is_empty()) {
1212 result
= new(ctx
) ir_expression(ir_binop_logic_and
, op
[0], op
[1]);
1213 type
= result
->type
;
1215 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1218 instructions
->push_tail(tmp
);
1220 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1221 instructions
->push_tail(stmt
);
1223 stmt
->then_instructions
.append_list(&rhs_instructions
);
1224 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1225 ir_assignment
*const then_assign
=
1226 new(ctx
) ir_assignment(then_deref
, op
[1], NULL
);
1227 stmt
->then_instructions
.push_tail(then_assign
);
1229 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1230 ir_assignment
*const else_assign
=
1231 new(ctx
) ir_assignment(else_deref
, new(ctx
) ir_constant(false), NULL
);
1232 stmt
->else_instructions
.push_tail(else_assign
);
1234 result
= new(ctx
) ir_dereference_variable(tmp
);
1240 case ast_logic_or
: {
1241 exec_list rhs_instructions
;
1242 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1243 "LHS", &error_emitted
);
1244 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1245 "RHS", &error_emitted
);
1247 if (rhs_instructions
.is_empty()) {
1248 result
= new(ctx
) ir_expression(ir_binop_logic_or
, op
[0], op
[1]);
1249 type
= result
->type
;
1251 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1254 instructions
->push_tail(tmp
);
1256 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1257 instructions
->push_tail(stmt
);
1259 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1260 ir_assignment
*const then_assign
=
1261 new(ctx
) ir_assignment(then_deref
, new(ctx
) ir_constant(true), NULL
);
1262 stmt
->then_instructions
.push_tail(then_assign
);
1264 stmt
->else_instructions
.append_list(&rhs_instructions
);
1265 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1266 ir_assignment
*const else_assign
=
1267 new(ctx
) ir_assignment(else_deref
, op
[1], NULL
);
1268 stmt
->else_instructions
.push_tail(else_assign
);
1270 result
= new(ctx
) ir_dereference_variable(tmp
);
1277 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1279 * "The logical binary operators and (&&), or ( | | ), and
1280 * exclusive or (^^). They operate only on two Boolean
1281 * expressions and result in a Boolean expression."
1283 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0, "LHS",
1285 op
[1] = get_scalar_boolean_operand(instructions
, state
, this, 1, "RHS",
1288 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1293 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1294 "operand", &error_emitted
);
1296 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1300 case ast_mul_assign
:
1301 case ast_div_assign
:
1302 case ast_add_assign
:
1303 case ast_sub_assign
: {
1304 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1305 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1307 type
= arithmetic_result_type(op
[0], op
[1],
1308 (this->oper
== ast_mul_assign
),
1311 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1314 result
= do_assignment(instructions
, state
,
1315 this->subexpressions
[0]->non_lvalue_description
,
1316 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1317 this->subexpressions
[0]->get_location());
1318 error_emitted
= (op
[0]->type
->is_error());
1320 /* GLSL 1.10 does not allow array assignment. However, we don't have to
1321 * explicitly test for this because none of the binary expression
1322 * operators allow array operands either.
1328 case ast_mod_assign
: {
1329 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1330 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1332 type
= modulus_result_type(op
[0]->type
, op
[1]->type
, state
, & loc
);
1334 assert(operations
[this->oper
] == ir_binop_mod
);
1336 ir_rvalue
*temp_rhs
;
1337 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1340 result
= do_assignment(instructions
, state
,
1341 this->subexpressions
[0]->non_lvalue_description
,
1342 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1343 this->subexpressions
[0]->get_location());
1344 error_emitted
= type
->is_error();
1349 case ast_rs_assign
: {
1350 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1351 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1352 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1354 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1355 type
, op
[0], op
[1]);
1356 result
= do_assignment(instructions
, state
,
1357 this->subexpressions
[0]->non_lvalue_description
,
1358 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1359 this->subexpressions
[0]->get_location());
1360 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1364 case ast_and_assign
:
1365 case ast_xor_assign
:
1366 case ast_or_assign
: {
1367 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1368 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1369 type
= bit_logic_result_type(op
[0]->type
, op
[1]->type
, this->oper
,
1371 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1372 type
, op
[0], op
[1]);
1373 result
= do_assignment(instructions
, state
,
1374 this->subexpressions
[0]->non_lvalue_description
,
1375 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1376 this->subexpressions
[0]->get_location());
1377 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1381 case ast_conditional
: {
1382 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1384 * "The ternary selection operator (?:). It operates on three
1385 * expressions (exp1 ? exp2 : exp3). This operator evaluates the
1386 * first expression, which must result in a scalar Boolean."
1388 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1389 "condition", &error_emitted
);
1391 /* The :? operator is implemented by generating an anonymous temporary
1392 * followed by an if-statement. The last instruction in each branch of
1393 * the if-statement assigns a value to the anonymous temporary. This
1394 * temporary is the r-value of the expression.
1396 exec_list then_instructions
;
1397 exec_list else_instructions
;
1399 op
[1] = this->subexpressions
[1]->hir(&then_instructions
, state
);
1400 op
[2] = this->subexpressions
[2]->hir(&else_instructions
, state
);
1402 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1404 * "The second and third expressions can be any type, as
1405 * long their types match, or there is a conversion in
1406 * Section 4.1.10 "Implicit Conversions" that can be applied
1407 * to one of the expressions to make their types match. This
1408 * resulting matching type is the type of the entire
1411 if ((!apply_implicit_conversion(op
[1]->type
, op
[2], state
)
1412 && !apply_implicit_conversion(op
[2]->type
, op
[1], state
))
1413 || (op
[1]->type
!= op
[2]->type
)) {
1414 YYLTYPE loc
= this->subexpressions
[1]->get_location();
1416 _mesa_glsl_error(& loc
, state
, "Second and third operands of ?: "
1417 "operator must have matching types.");
1418 error_emitted
= true;
1419 type
= glsl_type::error_type
;
1424 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1426 * "The second and third expressions must be the same type, but can
1427 * be of any type other than an array."
1429 if ((state
->language_version
<= 110) && type
->is_array()) {
1430 _mesa_glsl_error(& loc
, state
, "Second and third operands of ?: "
1431 "operator must not be arrays.");
1432 error_emitted
= true;
1435 ir_constant
*cond_val
= op
[0]->constant_expression_value();
1436 ir_constant
*then_val
= op
[1]->constant_expression_value();
1437 ir_constant
*else_val
= op
[2]->constant_expression_value();
1439 if (then_instructions
.is_empty()
1440 && else_instructions
.is_empty()
1441 && (cond_val
!= NULL
) && (then_val
!= NULL
) && (else_val
!= NULL
)) {
1442 result
= (cond_val
->value
.b
[0]) ? then_val
: else_val
;
1444 ir_variable
*const tmp
=
1445 new(ctx
) ir_variable(type
, "conditional_tmp", ir_var_temporary
);
1446 instructions
->push_tail(tmp
);
1448 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1449 instructions
->push_tail(stmt
);
1451 then_instructions
.move_nodes_to(& stmt
->then_instructions
);
1452 ir_dereference
*const then_deref
=
1453 new(ctx
) ir_dereference_variable(tmp
);
1454 ir_assignment
*const then_assign
=
1455 new(ctx
) ir_assignment(then_deref
, op
[1], NULL
);
1456 stmt
->then_instructions
.push_tail(then_assign
);
1458 else_instructions
.move_nodes_to(& stmt
->else_instructions
);
1459 ir_dereference
*const else_deref
=
1460 new(ctx
) ir_dereference_variable(tmp
);
1461 ir_assignment
*const else_assign
=
1462 new(ctx
) ir_assignment(else_deref
, op
[2], NULL
);
1463 stmt
->else_instructions
.push_tail(else_assign
);
1465 result
= new(ctx
) ir_dereference_variable(tmp
);
1472 this->non_lvalue_description
= (this->oper
== ast_pre_inc
)
1473 ? "pre-increment operation" : "pre-decrement operation";
1475 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1476 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1478 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1480 ir_rvalue
*temp_rhs
;
1481 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1484 result
= do_assignment(instructions
, state
,
1485 this->subexpressions
[0]->non_lvalue_description
,
1486 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1487 this->subexpressions
[0]->get_location());
1488 error_emitted
= op
[0]->type
->is_error();
1493 case ast_post_dec
: {
1494 this->non_lvalue_description
= (this->oper
== ast_post_inc
)
1495 ? "post-increment operation" : "post-decrement operation";
1496 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1497 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1499 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1501 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1503 ir_rvalue
*temp_rhs
;
1504 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1507 /* Get a temporary of a copy of the lvalue before it's modified.
1508 * This may get thrown away later.
1510 result
= get_lvalue_copy(instructions
, op
[0]->clone(ctx
, NULL
));
1512 (void)do_assignment(instructions
, state
,
1513 this->subexpressions
[0]->non_lvalue_description
,
1514 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1515 this->subexpressions
[0]->get_location());
1517 error_emitted
= op
[0]->type
->is_error();
1521 case ast_field_selection
:
1522 result
= _mesa_ast_field_selection_to_hir(this, instructions
, state
);
1525 case ast_array_index
: {
1526 YYLTYPE index_loc
= subexpressions
[1]->get_location();
1528 op
[0] = subexpressions
[0]->hir(instructions
, state
);
1529 op
[1] = subexpressions
[1]->hir(instructions
, state
);
1531 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1533 ir_rvalue
*const array
= op
[0];
1535 result
= new(ctx
) ir_dereference_array(op
[0], op
[1]);
1537 /* Do not use op[0] after this point. Use array.
1545 if (!array
->type
->is_array()
1546 && !array
->type
->is_matrix()
1547 && !array
->type
->is_vector()) {
1548 _mesa_glsl_error(& index_loc
, state
,
1549 "cannot dereference non-array / non-matrix / "
1551 error_emitted
= true;
1554 if (!op
[1]->type
->is_integer()) {
1555 _mesa_glsl_error(& index_loc
, state
,
1556 "array index must be integer type");
1557 error_emitted
= true;
1558 } else if (!op
[1]->type
->is_scalar()) {
1559 _mesa_glsl_error(& index_loc
, state
,
1560 "array index must be scalar");
1561 error_emitted
= true;
1564 /* If the array index is a constant expression and the array has a
1565 * declared size, ensure that the access is in-bounds. If the array
1566 * index is not a constant expression, ensure that the array has a
1569 ir_constant
*const const_index
= op
[1]->constant_expression_value();
1570 if (const_index
!= NULL
) {
1571 const int idx
= const_index
->value
.i
[0];
1572 const char *type_name
;
1575 if (array
->type
->is_matrix()) {
1576 type_name
= "matrix";
1577 } else if (array
->type
->is_vector()) {
1578 type_name
= "vector";
1580 type_name
= "array";
1583 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec:
1585 * "It is illegal to declare an array with a size, and then
1586 * later (in the same shader) index the same array with an
1587 * integral constant expression greater than or equal to the
1588 * declared size. It is also illegal to index an array with a
1589 * negative constant expression."
1591 if (array
->type
->is_matrix()) {
1592 if (array
->type
->row_type()->vector_elements
<= idx
) {
1593 bound
= array
->type
->row_type()->vector_elements
;
1595 } else if (array
->type
->is_vector()) {
1596 if (array
->type
->vector_elements
<= idx
) {
1597 bound
= array
->type
->vector_elements
;
1600 if ((array
->type
->array_size() > 0)
1601 && (array
->type
->array_size() <= idx
)) {
1602 bound
= array
->type
->array_size();
1607 _mesa_glsl_error(& loc
, state
, "%s index must be < %u",
1609 error_emitted
= true;
1610 } else if (idx
< 0) {
1611 _mesa_glsl_error(& loc
, state
, "%s index must be >= 0",
1613 error_emitted
= true;
1616 if (array
->type
->is_array()) {
1617 /* If the array is a variable dereference, it dereferences the
1618 * whole array, by definition. Use this to get the variable.
1620 * FINISHME: Should some methods for getting / setting / testing
1621 * FINISHME: array access limits be added to ir_dereference?
1623 ir_variable
*const v
= array
->whole_variable_referenced();
1624 if ((v
!= NULL
) && (unsigned(idx
) > v
->max_array_access
)) {
1625 v
->max_array_access
= idx
;
1627 /* Check whether this access will, as a side effect, implicitly
1628 * cause the size of a built-in array to be too large.
1630 if (check_builtin_array_max_size(v
->name
, idx
+1, loc
, state
))
1631 error_emitted
= true;
1634 } else if (array
->type
->array_size() == 0) {
1635 _mesa_glsl_error(&loc
, state
, "unsized array index must be constant");
1637 if (array
->type
->is_array()) {
1638 /* whole_variable_referenced can return NULL if the array is a
1639 * member of a structure. In this case it is safe to not update
1640 * the max_array_access field because it is never used for fields
1643 ir_variable
*v
= array
->whole_variable_referenced();
1645 v
->max_array_access
= array
->type
->array_size() - 1;
1649 /* From page 23 (29 of the PDF) of the GLSL 1.30 spec:
1651 * "Samplers aggregated into arrays within a shader (using square
1652 * brackets [ ]) can only be indexed with integral constant
1653 * expressions [...]."
1655 * This restriction was added in GLSL 1.30. Shaders using earlier version
1656 * of the language should not be rejected by the compiler front-end for
1657 * using this construct. This allows useful things such as using a loop
1658 * counter as the index to an array of samplers. If the loop in unrolled,
1659 * the code should compile correctly. Instead, emit a warning.
1661 if (array
->type
->is_array() &&
1662 array
->type
->element_type()->is_sampler() &&
1663 const_index
== NULL
) {
1665 if (state
->language_version
== 100) {
1666 _mesa_glsl_warning(&loc
, state
,
1667 "sampler arrays indexed with non-constant "
1668 "expressions is optional in GLSL ES 1.00");
1669 } else if (state
->language_version
< 130) {
1670 _mesa_glsl_warning(&loc
, state
,
1671 "sampler arrays indexed with non-constant "
1672 "expressions is forbidden in GLSL 1.30 and "
1675 _mesa_glsl_error(&loc
, state
,
1676 "sampler arrays indexed with non-constant "
1677 "expressions is forbidden in GLSL 1.30 and "
1679 error_emitted
= true;
1684 result
->type
= glsl_type::error_type
;
1689 case ast_function_call
:
1690 /* Should *NEVER* get here. ast_function_call should always be handled
1691 * by ast_function_expression::hir.
1696 case ast_identifier
: {
1697 /* ast_identifier can appear several places in a full abstract syntax
1698 * tree. This particular use must be at location specified in the grammar
1699 * as 'variable_identifier'.
1702 state
->symbols
->get_variable(this->primary_expression
.identifier
);
1706 result
= new(ctx
) ir_dereference_variable(var
);
1708 _mesa_glsl_error(& loc
, state
, "`%s' undeclared",
1709 this->primary_expression
.identifier
);
1711 result
= ir_rvalue::error_value(ctx
);
1712 error_emitted
= true;
1717 case ast_int_constant
:
1718 result
= new(ctx
) ir_constant(this->primary_expression
.int_constant
);
1721 case ast_uint_constant
:
1722 result
= new(ctx
) ir_constant(this->primary_expression
.uint_constant
);
1725 case ast_float_constant
:
1726 result
= new(ctx
) ir_constant(this->primary_expression
.float_constant
);
1729 case ast_bool_constant
:
1730 result
= new(ctx
) ir_constant(bool(this->primary_expression
.bool_constant
));
1733 case ast_sequence
: {
1734 /* It should not be possible to generate a sequence in the AST without
1735 * any expressions in it.
1737 assert(!this->expressions
.is_empty());
1739 /* The r-value of a sequence is the last expression in the sequence. If
1740 * the other expressions in the sequence do not have side-effects (and
1741 * therefore add instructions to the instruction list), they get dropped
1744 exec_node
*previous_tail_pred
= NULL
;
1745 YYLTYPE previous_operand_loc
= loc
;
1747 foreach_list_typed (ast_node
, ast
, link
, &this->expressions
) {
1748 /* If one of the operands of comma operator does not generate any
1749 * code, we want to emit a warning. At each pass through the loop
1750 * previous_tail_pred will point to the last instruction in the
1751 * stream *before* processing the previous operand. Naturally,
1752 * instructions->tail_pred will point to the last instruction in the
1753 * stream *after* processing the previous operand. If the two
1754 * pointers match, then the previous operand had no effect.
1756 * The warning behavior here differs slightly from GCC. GCC will
1757 * only emit a warning if none of the left-hand operands have an
1758 * effect. However, it will emit a warning for each. I believe that
1759 * there are some cases in C (especially with GCC extensions) where
1760 * it is useful to have an intermediate step in a sequence have no
1761 * effect, but I don't think these cases exist in GLSL. Either way,
1762 * it would be a giant hassle to replicate that behavior.
1764 if (previous_tail_pred
== instructions
->tail_pred
) {
1765 _mesa_glsl_warning(&previous_operand_loc
, state
,
1766 "left-hand operand of comma expression has "
1770 /* tail_pred is directly accessed instead of using the get_tail()
1771 * method for performance reasons. get_tail() has extra code to
1772 * return NULL when the list is empty. We don't care about that
1773 * here, so using tail_pred directly is fine.
1775 previous_tail_pred
= instructions
->tail_pred
;
1776 previous_operand_loc
= ast
->get_location();
1778 result
= ast
->hir(instructions
, state
);
1781 /* Any errors should have already been emitted in the loop above.
1783 error_emitted
= true;
1787 type
= NULL
; /* use result->type, not type. */
1788 assert(result
!= NULL
);
1790 if (result
->type
->is_error() && !error_emitted
)
1791 _mesa_glsl_error(& loc
, state
, "type mismatch");
1798 ast_expression_statement::hir(exec_list
*instructions
,
1799 struct _mesa_glsl_parse_state
*state
)
1801 /* It is possible to have expression statements that don't have an
1802 * expression. This is the solitary semicolon:
1804 * for (i = 0; i < 5; i++)
1807 * In this case the expression will be NULL. Test for NULL and don't do
1808 * anything in that case.
1810 if (expression
!= NULL
)
1811 expression
->hir(instructions
, state
);
1813 /* Statements do not have r-values.
1820 ast_compound_statement::hir(exec_list
*instructions
,
1821 struct _mesa_glsl_parse_state
*state
)
1824 state
->symbols
->push_scope();
1826 foreach_list_typed (ast_node
, ast
, link
, &this->statements
)
1827 ast
->hir(instructions
, state
);
1830 state
->symbols
->pop_scope();
1832 /* Compound statements do not have r-values.
1838 static const glsl_type
*
1839 process_array_type(YYLTYPE
*loc
, const glsl_type
*base
, ast_node
*array_size
,
1840 struct _mesa_glsl_parse_state
*state
)
1842 unsigned length
= 0;
1844 /* From page 19 (page 25) of the GLSL 1.20 spec:
1846 * "Only one-dimensional arrays may be declared."
1848 if (base
->is_array()) {
1849 _mesa_glsl_error(loc
, state
,
1850 "invalid array of `%s' (only one-dimensional arrays "
1853 return glsl_type::error_type
;
1856 if (array_size
!= NULL
) {
1857 exec_list dummy_instructions
;
1858 ir_rvalue
*const ir
= array_size
->hir(& dummy_instructions
, state
);
1859 YYLTYPE loc
= array_size
->get_location();
1862 if (!ir
->type
->is_integer()) {
1863 _mesa_glsl_error(& loc
, state
, "array size must be integer type");
1864 } else if (!ir
->type
->is_scalar()) {
1865 _mesa_glsl_error(& loc
, state
, "array size must be scalar type");
1867 ir_constant
*const size
= ir
->constant_expression_value();
1870 _mesa_glsl_error(& loc
, state
, "array size must be a "
1871 "constant valued expression");
1872 } else if (size
->value
.i
[0] <= 0) {
1873 _mesa_glsl_error(& loc
, state
, "array size must be > 0");
1875 assert(size
->type
== ir
->type
);
1876 length
= size
->value
.u
[0];
1878 /* If the array size is const (and we've verified that
1879 * it is) then no instructions should have been emitted
1880 * when we converted it to HIR. If they were emitted,
1881 * then either the array size isn't const after all, or
1882 * we are emitting unnecessary instructions.
1884 assert(dummy_instructions
.is_empty());
1888 } else if (state
->es_shader
) {
1889 /* Section 10.17 of the GLSL ES 1.00 specification states that unsized
1890 * array declarations have been removed from the language.
1892 _mesa_glsl_error(loc
, state
, "unsized array declarations are not "
1893 "allowed in GLSL ES 1.00.");
1896 return glsl_type::get_array_instance(base
, length
);
1901 ast_type_specifier::glsl_type(const char **name
,
1902 struct _mesa_glsl_parse_state
*state
) const
1904 const struct glsl_type
*type
;
1906 type
= state
->symbols
->get_type(this->type_name
);
1907 *name
= this->type_name
;
1909 if (this->is_array
) {
1910 YYLTYPE loc
= this->get_location();
1911 type
= process_array_type(&loc
, type
, this->array_size
, state
);
1919 apply_type_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
1921 struct _mesa_glsl_parse_state
*state
,
1924 if (qual
->flags
.q
.invariant
) {
1926 _mesa_glsl_error(loc
, state
,
1927 "variable `%s' may not be redeclared "
1928 "`invariant' after being used",
1935 if (qual
->flags
.q
.constant
|| qual
->flags
.q
.attribute
1936 || qual
->flags
.q
.uniform
1937 || (qual
->flags
.q
.varying
&& (state
->target
== fragment_shader
)))
1940 if (qual
->flags
.q
.centroid
)
1943 if (qual
->flags
.q
.attribute
&& state
->target
!= vertex_shader
) {
1944 var
->type
= glsl_type::error_type
;
1945 _mesa_glsl_error(loc
, state
,
1946 "`attribute' variables may not be declared in the "
1948 _mesa_glsl_shader_target_name(state
->target
));
1951 /* From page 25 (page 31 of the PDF) of the GLSL 1.10 spec:
1953 * "The varying qualifier can be used only with the data types
1954 * float, vec2, vec3, vec4, mat2, mat3, and mat4, or arrays of
1957 if (qual
->flags
.q
.varying
) {
1958 const glsl_type
*non_array_type
;
1960 if (var
->type
&& var
->type
->is_array())
1961 non_array_type
= var
->type
->fields
.array
;
1963 non_array_type
= var
->type
;
1965 if (non_array_type
&& non_array_type
->base_type
!= GLSL_TYPE_FLOAT
) {
1966 var
->type
= glsl_type::error_type
;
1967 _mesa_glsl_error(loc
, state
,
1968 "varying variables must be of base type float");
1972 /* If there is no qualifier that changes the mode of the variable, leave
1973 * the setting alone.
1975 if (qual
->flags
.q
.in
&& qual
->flags
.q
.out
)
1976 var
->mode
= ir_var_inout
;
1977 else if (qual
->flags
.q
.attribute
|| qual
->flags
.q
.in
1978 || (qual
->flags
.q
.varying
&& (state
->target
== fragment_shader
)))
1979 var
->mode
= ir_var_in
;
1980 else if (qual
->flags
.q
.out
1981 || (qual
->flags
.q
.varying
&& (state
->target
== vertex_shader
)))
1982 var
->mode
= ir_var_out
;
1983 else if (qual
->flags
.q
.uniform
)
1984 var
->mode
= ir_var_uniform
;
1986 if (state
->all_invariant
&& (state
->current_function
== NULL
)) {
1987 switch (state
->target
) {
1989 if (var
->mode
== ir_var_out
)
1990 var
->invariant
= true;
1992 case geometry_shader
:
1993 if ((var
->mode
== ir_var_in
) || (var
->mode
== ir_var_out
))
1994 var
->invariant
= true;
1996 case fragment_shader
:
1997 if (var
->mode
== ir_var_in
)
1998 var
->invariant
= true;
2003 if (qual
->flags
.q
.flat
)
2004 var
->interpolation
= INTERP_QUALIFIER_FLAT
;
2005 else if (qual
->flags
.q
.noperspective
)
2006 var
->interpolation
= INTERP_QUALIFIER_NOPERSPECTIVE
;
2007 else if (qual
->flags
.q
.smooth
)
2008 var
->interpolation
= INTERP_QUALIFIER_SMOOTH
;
2010 var
->interpolation
= INTERP_QUALIFIER_NONE
;
2012 if (var
->interpolation
!= INTERP_QUALIFIER_NONE
&&
2013 !(state
->target
== vertex_shader
&& var
->mode
== ir_var_out
) &&
2014 !(state
->target
== fragment_shader
&& var
->mode
== ir_var_in
)) {
2015 const char *qual_string
= NULL
;
2016 switch (var
->interpolation
) {
2017 case INTERP_QUALIFIER_FLAT
:
2018 qual_string
= "flat";
2020 case INTERP_QUALIFIER_NOPERSPECTIVE
:
2021 qual_string
= "noperspective";
2023 case INTERP_QUALIFIER_SMOOTH
:
2024 qual_string
= "smooth";
2028 _mesa_glsl_error(loc
, state
,
2029 "interpolation qualifier `%s' can only be applied to "
2030 "vertex shader outputs and fragment shader inputs.",
2035 var
->pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
2036 var
->origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
2037 if ((qual
->flags
.q
.origin_upper_left
|| qual
->flags
.q
.pixel_center_integer
)
2038 && (strcmp(var
->name
, "gl_FragCoord") != 0)) {
2039 const char *const qual_string
= (qual
->flags
.q
.origin_upper_left
)
2040 ? "origin_upper_left" : "pixel_center_integer";
2042 _mesa_glsl_error(loc
, state
,
2043 "layout qualifier `%s' can only be applied to "
2044 "fragment shader input `gl_FragCoord'",
2048 if (qual
->flags
.q
.explicit_location
) {
2049 const bool global_scope
= (state
->current_function
== NULL
);
2051 const char *string
= "";
2053 /* In the vertex shader only shader inputs can be given explicit
2056 * In the fragment shader only shader outputs can be given explicit
2059 switch (state
->target
) {
2061 if (!global_scope
|| (var
->mode
!= ir_var_in
)) {
2067 case geometry_shader
:
2068 _mesa_glsl_error(loc
, state
,
2069 "geometry shader variables cannot be given "
2070 "explicit locations\n");
2073 case fragment_shader
:
2074 if (!global_scope
|| (var
->mode
!= ir_var_out
)) {
2082 _mesa_glsl_error(loc
, state
,
2083 "only %s shader %s variables can be given an "
2084 "explicit location\n",
2085 _mesa_glsl_shader_target_name(state
->target
),
2088 var
->explicit_location
= true;
2090 /* This bit of silliness is needed because invalid explicit locations
2091 * are supposed to be flagged during linking. Small negative values
2092 * biased by VERT_ATTRIB_GENERIC0 or FRAG_RESULT_DATA0 could alias
2093 * built-in values (e.g., -16+VERT_ATTRIB_GENERIC0 = VERT_ATTRIB_POS).
2094 * The linker needs to be able to differentiate these cases. This
2095 * ensures that negative values stay negative.
2097 if (qual
->location
>= 0) {
2098 var
->location
= (state
->target
== vertex_shader
)
2099 ? (qual
->location
+ VERT_ATTRIB_GENERIC0
)
2100 : (qual
->location
+ FRAG_RESULT_DATA0
);
2102 var
->location
= qual
->location
;
2104 if (qual
->flags
.q
.explicit_index
) {
2105 var
->explicit_index
= true;
2106 var
->index
= qual
->index
;
2109 } else if (qual
->flags
.q
.explicit_index
) {
2110 _mesa_glsl_error(loc
, state
,
2111 "explicit index requires explicit location\n");
2114 /* Does the declaration use the 'layout' keyword?
2116 const bool uses_layout
= qual
->flags
.q
.pixel_center_integer
2117 || qual
->flags
.q
.origin_upper_left
2118 || qual
->flags
.q
.explicit_location
; /* no need for index since it relies on location */
2120 /* Does the declaration use the deprecated 'attribute' or 'varying'
2123 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
2124 || qual
->flags
.q
.varying
;
2126 /* Is the 'layout' keyword used with parameters that allow relaxed checking.
2127 * Many implementations of GL_ARB_fragment_coord_conventions_enable and some
2128 * implementations (only Mesa?) GL_ARB_explicit_attrib_location_enable
2129 * allowed the layout qualifier to be used with 'varying' and 'attribute'.
2130 * These extensions and all following extensions that add the 'layout'
2131 * keyword have been modified to require the use of 'in' or 'out'.
2133 * The following extension do not allow the deprecated keywords:
2135 * GL_AMD_conservative_depth
2136 * GL_ARB_conservative_depth
2137 * GL_ARB_gpu_shader5
2138 * GL_ARB_separate_shader_objects
2139 * GL_ARB_tesselation_shader
2140 * GL_ARB_transform_feedback3
2141 * GL_ARB_uniform_buffer_object
2143 * It is unknown whether GL_EXT_shader_image_load_store or GL_NV_gpu_shader5
2144 * allow layout with the deprecated keywords.
2146 const bool relaxed_layout_qualifier_checking
=
2147 state
->ARB_fragment_coord_conventions_enable
;
2149 if (uses_layout
&& uses_deprecated_qualifier
) {
2150 if (relaxed_layout_qualifier_checking
) {
2151 _mesa_glsl_warning(loc
, state
,
2152 "`layout' qualifier may not be used with "
2153 "`attribute' or `varying'");
2155 _mesa_glsl_error(loc
, state
,
2156 "`layout' qualifier may not be used with "
2157 "`attribute' or `varying'");
2161 /* Layout qualifiers for gl_FragDepth, which are enabled by extension
2162 * AMD_conservative_depth.
2164 int depth_layout_count
= qual
->flags
.q
.depth_any
2165 + qual
->flags
.q
.depth_greater
2166 + qual
->flags
.q
.depth_less
2167 + qual
->flags
.q
.depth_unchanged
;
2168 if (depth_layout_count
> 0
2169 && !state
->AMD_conservative_depth_enable
2170 && !state
->ARB_conservative_depth_enable
) {
2171 _mesa_glsl_error(loc
, state
,
2172 "extension GL_AMD_conservative_depth or "
2173 "GL_ARB_conservative_depth must be enabled "
2174 "to use depth layout qualifiers");
2175 } else if (depth_layout_count
> 0
2176 && strcmp(var
->name
, "gl_FragDepth") != 0) {
2177 _mesa_glsl_error(loc
, state
,
2178 "depth layout qualifiers can be applied only to "
2180 } else if (depth_layout_count
> 1
2181 && strcmp(var
->name
, "gl_FragDepth") == 0) {
2182 _mesa_glsl_error(loc
, state
,
2183 "at most one depth layout qualifier can be applied to "
2186 if (qual
->flags
.q
.depth_any
)
2187 var
->depth_layout
= ir_depth_layout_any
;
2188 else if (qual
->flags
.q
.depth_greater
)
2189 var
->depth_layout
= ir_depth_layout_greater
;
2190 else if (qual
->flags
.q
.depth_less
)
2191 var
->depth_layout
= ir_depth_layout_less
;
2192 else if (qual
->flags
.q
.depth_unchanged
)
2193 var
->depth_layout
= ir_depth_layout_unchanged
;
2195 var
->depth_layout
= ir_depth_layout_none
;
2199 * Get the variable that is being redeclared by this declaration
2201 * Semantic checks to verify the validity of the redeclaration are also
2202 * performed. If semantic checks fail, compilation error will be emitted via
2203 * \c _mesa_glsl_error, but a non-\c NULL pointer will still be returned.
2206 * A pointer to an existing variable in the current scope if the declaration
2207 * is a redeclaration, \c NULL otherwise.
2210 get_variable_being_redeclared(ir_variable
*var
, ast_declaration
*decl
,
2211 struct _mesa_glsl_parse_state
*state
)
2213 /* Check if this declaration is actually a re-declaration, either to
2214 * resize an array or add qualifiers to an existing variable.
2216 * This is allowed for variables in the current scope, or when at
2217 * global scope (for built-ins in the implicit outer scope).
2219 ir_variable
*earlier
= state
->symbols
->get_variable(decl
->identifier
);
2220 if (earlier
== NULL
||
2221 (state
->current_function
!= NULL
&&
2222 !state
->symbols
->name_declared_this_scope(decl
->identifier
))) {
2227 YYLTYPE loc
= decl
->get_location();
2229 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec,
2231 * "It is legal to declare an array without a size and then
2232 * later re-declare the same name as an array of the same
2233 * type and specify a size."
2235 if ((earlier
->type
->array_size() == 0)
2236 && var
->type
->is_array()
2237 && (var
->type
->element_type() == earlier
->type
->element_type())) {
2238 /* FINISHME: This doesn't match the qualifiers on the two
2239 * FINISHME: declarations. It's not 100% clear whether this is
2240 * FINISHME: required or not.
2243 const unsigned size
= unsigned(var
->type
->array_size());
2244 check_builtin_array_max_size(var
->name
, size
, loc
, state
);
2245 if ((size
> 0) && (size
<= earlier
->max_array_access
)) {
2246 _mesa_glsl_error(& loc
, state
, "array size must be > %u due to "
2248 earlier
->max_array_access
);
2251 earlier
->type
= var
->type
;
2254 } else if (state
->ARB_fragment_coord_conventions_enable
2255 && strcmp(var
->name
, "gl_FragCoord") == 0
2256 && earlier
->type
== var
->type
2257 && earlier
->mode
== var
->mode
) {
2258 /* Allow redeclaration of gl_FragCoord for ARB_fcc layout
2261 earlier
->origin_upper_left
= var
->origin_upper_left
;
2262 earlier
->pixel_center_integer
= var
->pixel_center_integer
;
2264 /* According to section 4.3.7 of the GLSL 1.30 spec,
2265 * the following built-in varaibles can be redeclared with an
2266 * interpolation qualifier:
2269 * * gl_FrontSecondaryColor
2270 * * gl_BackSecondaryColor
2272 * * gl_SecondaryColor
2274 } else if (state
->language_version
>= 130
2275 && (strcmp(var
->name
, "gl_FrontColor") == 0
2276 || strcmp(var
->name
, "gl_BackColor") == 0
2277 || strcmp(var
->name
, "gl_FrontSecondaryColor") == 0
2278 || strcmp(var
->name
, "gl_BackSecondaryColor") == 0
2279 || strcmp(var
->name
, "gl_Color") == 0
2280 || strcmp(var
->name
, "gl_SecondaryColor") == 0)
2281 && earlier
->type
== var
->type
2282 && earlier
->mode
== var
->mode
) {
2283 earlier
->interpolation
= var
->interpolation
;
2285 /* Layout qualifiers for gl_FragDepth. */
2286 } else if ((state
->AMD_conservative_depth_enable
||
2287 state
->ARB_conservative_depth_enable
)
2288 && strcmp(var
->name
, "gl_FragDepth") == 0
2289 && earlier
->type
== var
->type
2290 && earlier
->mode
== var
->mode
) {
2292 /** From the AMD_conservative_depth spec:
2293 * Within any shader, the first redeclarations of gl_FragDepth
2294 * must appear before any use of gl_FragDepth.
2296 if (earlier
->used
) {
2297 _mesa_glsl_error(&loc
, state
,
2298 "the first redeclaration of gl_FragDepth "
2299 "must appear before any use of gl_FragDepth");
2302 /* Prevent inconsistent redeclaration of depth layout qualifier. */
2303 if (earlier
->depth_layout
!= ir_depth_layout_none
2304 && earlier
->depth_layout
!= var
->depth_layout
) {
2305 _mesa_glsl_error(&loc
, state
,
2306 "gl_FragDepth: depth layout is declared here "
2307 "as '%s, but it was previously declared as "
2309 depth_layout_string(var
->depth_layout
),
2310 depth_layout_string(earlier
->depth_layout
));
2313 earlier
->depth_layout
= var
->depth_layout
;
2316 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", decl
->identifier
);
2323 * Generate the IR for an initializer in a variable declaration
2326 process_initializer(ir_variable
*var
, ast_declaration
*decl
,
2327 ast_fully_specified_type
*type
,
2328 exec_list
*initializer_instructions
,
2329 struct _mesa_glsl_parse_state
*state
)
2331 ir_rvalue
*result
= NULL
;
2333 YYLTYPE initializer_loc
= decl
->initializer
->get_location();
2335 /* From page 24 (page 30 of the PDF) of the GLSL 1.10 spec:
2337 * "All uniform variables are read-only and are initialized either
2338 * directly by an application via API commands, or indirectly by
2341 if ((state
->language_version
<= 110)
2342 && (var
->mode
== ir_var_uniform
)) {
2343 _mesa_glsl_error(& initializer_loc
, state
,
2344 "cannot initialize uniforms in GLSL 1.10");
2347 if (var
->type
->is_sampler()) {
2348 _mesa_glsl_error(& initializer_loc
, state
,
2349 "cannot initialize samplers");
2352 if ((var
->mode
== ir_var_in
) && (state
->current_function
== NULL
)) {
2353 _mesa_glsl_error(& initializer_loc
, state
,
2354 "cannot initialize %s shader input / %s",
2355 _mesa_glsl_shader_target_name(state
->target
),
2356 (state
->target
== vertex_shader
)
2357 ? "attribute" : "varying");
2360 ir_dereference
*const lhs
= new(state
) ir_dereference_variable(var
);
2361 ir_rvalue
*rhs
= decl
->initializer
->hir(initializer_instructions
,
2364 /* Calculate the constant value if this is a const or uniform
2367 if (type
->qualifier
.flags
.q
.constant
2368 || type
->qualifier
.flags
.q
.uniform
) {
2369 ir_rvalue
*new_rhs
= validate_assignment(state
, var
->type
, rhs
, true);
2370 if (new_rhs
!= NULL
) {
2373 ir_constant
*constant_value
= rhs
->constant_expression_value();
2374 if (!constant_value
) {
2375 _mesa_glsl_error(& initializer_loc
, state
,
2376 "initializer of %s variable `%s' must be a "
2377 "constant expression",
2378 (type
->qualifier
.flags
.q
.constant
)
2379 ? "const" : "uniform",
2381 if (var
->type
->is_numeric()) {
2382 /* Reduce cascading errors. */
2383 var
->constant_value
= ir_constant::zero(state
, var
->type
);
2386 rhs
= constant_value
;
2387 var
->constant_value
= constant_value
;
2390 _mesa_glsl_error(&initializer_loc
, state
,
2391 "initializer of type %s cannot be assigned to "
2392 "variable of type %s",
2393 rhs
->type
->name
, var
->type
->name
);
2394 if (var
->type
->is_numeric()) {
2395 /* Reduce cascading errors. */
2396 var
->constant_value
= ir_constant::zero(state
, var
->type
);
2401 if (rhs
&& !rhs
->type
->is_error()) {
2402 bool temp
= var
->read_only
;
2403 if (type
->qualifier
.flags
.q
.constant
)
2404 var
->read_only
= false;
2406 /* Never emit code to initialize a uniform.
2408 const glsl_type
*initializer_type
;
2409 if (!type
->qualifier
.flags
.q
.uniform
) {
2410 result
= do_assignment(initializer_instructions
, state
,
2413 type
->get_location());
2414 initializer_type
= result
->type
;
2416 initializer_type
= rhs
->type
;
2418 var
->constant_initializer
= rhs
->constant_expression_value();
2419 var
->has_initializer
= true;
2421 /* If the declared variable is an unsized array, it must inherrit
2422 * its full type from the initializer. A declaration such as
2424 * uniform float a[] = float[](1.0, 2.0, 3.0, 3.0);
2428 * uniform float a[4] = float[](1.0, 2.0, 3.0, 3.0);
2430 * The assignment generated in the if-statement (below) will also
2431 * automatically handle this case for non-uniforms.
2433 * If the declared variable is not an array, the types must
2434 * already match exactly. As a result, the type assignment
2435 * here can be done unconditionally. For non-uniforms the call
2436 * to do_assignment can change the type of the initializer (via
2437 * the implicit conversion rules). For uniforms the initializer
2438 * must be a constant expression, and the type of that expression
2439 * was validated above.
2441 var
->type
= initializer_type
;
2443 var
->read_only
= temp
;
2450 ast_declarator_list::hir(exec_list
*instructions
,
2451 struct _mesa_glsl_parse_state
*state
)
2454 const struct glsl_type
*decl_type
;
2455 const char *type_name
= NULL
;
2456 ir_rvalue
*result
= NULL
;
2457 YYLTYPE loc
= this->get_location();
2459 /* From page 46 (page 52 of the PDF) of the GLSL 1.50 spec:
2461 * "To ensure that a particular output variable is invariant, it is
2462 * necessary to use the invariant qualifier. It can either be used to
2463 * qualify a previously declared variable as being invariant
2465 * invariant gl_Position; // make existing gl_Position be invariant"
2467 * In these cases the parser will set the 'invariant' flag in the declarator
2468 * list, and the type will be NULL.
2470 if (this->invariant
) {
2471 assert(this->type
== NULL
);
2473 if (state
->current_function
!= NULL
) {
2474 _mesa_glsl_error(& loc
, state
,
2475 "All uses of `invariant' keyword must be at global "
2479 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
2480 assert(!decl
->is_array
);
2481 assert(decl
->array_size
== NULL
);
2482 assert(decl
->initializer
== NULL
);
2484 ir_variable
*const earlier
=
2485 state
->symbols
->get_variable(decl
->identifier
);
2486 if (earlier
== NULL
) {
2487 _mesa_glsl_error(& loc
, state
,
2488 "Undeclared variable `%s' cannot be marked "
2489 "invariant\n", decl
->identifier
);
2490 } else if ((state
->target
== vertex_shader
)
2491 && (earlier
->mode
!= ir_var_out
)) {
2492 _mesa_glsl_error(& loc
, state
,
2493 "`%s' cannot be marked invariant, vertex shader "
2494 "outputs only\n", decl
->identifier
);
2495 } else if ((state
->target
== fragment_shader
)
2496 && (earlier
->mode
!= ir_var_in
)) {
2497 _mesa_glsl_error(& loc
, state
,
2498 "`%s' cannot be marked invariant, fragment shader "
2499 "inputs only\n", decl
->identifier
);
2500 } else if (earlier
->used
) {
2501 _mesa_glsl_error(& loc
, state
,
2502 "variable `%s' may not be redeclared "
2503 "`invariant' after being used",
2506 earlier
->invariant
= true;
2510 /* Invariant redeclarations do not have r-values.
2515 assert(this->type
!= NULL
);
2516 assert(!this->invariant
);
2518 /* The type specifier may contain a structure definition. Process that
2519 * before any of the variable declarations.
2521 (void) this->type
->specifier
->hir(instructions
, state
);
2523 decl_type
= this->type
->specifier
->glsl_type(& type_name
, state
);
2524 if (this->declarations
.is_empty()) {
2525 /* If there is no structure involved in the program text, there are two
2526 * possible scenarios:
2528 * - The program text contained something like 'vec4;'. This is an
2529 * empty declaration. It is valid but weird. Emit a warning.
2531 * - The program text contained something like 'S;' and 'S' is not the
2532 * name of a known structure type. This is both invalid and weird.
2535 * Note that if decl_type is NULL and there is a structure involved,
2536 * there must have been some sort of error with the structure. In this
2537 * case we assume that an error was already generated on this line of
2538 * code for the structure. There is no need to generate an additional,
2541 assert(this->type
->specifier
->structure
== NULL
|| decl_type
!= NULL
2543 if (this->type
->specifier
->structure
== NULL
) {
2544 if (decl_type
!= NULL
) {
2545 _mesa_glsl_warning(&loc
, state
, "empty declaration");
2547 _mesa_glsl_error(&loc
, state
,
2548 "invalid type `%s' in empty declaration",
2554 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
2555 const struct glsl_type
*var_type
;
2558 /* FINISHME: Emit a warning if a variable declaration shadows a
2559 * FINISHME: declaration at a higher scope.
2562 if ((decl_type
== NULL
) || decl_type
->is_void()) {
2563 if (type_name
!= NULL
) {
2564 _mesa_glsl_error(& loc
, state
,
2565 "invalid type `%s' in declaration of `%s'",
2566 type_name
, decl
->identifier
);
2568 _mesa_glsl_error(& loc
, state
,
2569 "invalid type in declaration of `%s'",
2575 if (decl
->is_array
) {
2576 var_type
= process_array_type(&loc
, decl_type
, decl
->array_size
,
2578 if (var_type
->is_error())
2581 var_type
= decl_type
;
2584 var
= new(ctx
) ir_variable(var_type
, decl
->identifier
, ir_var_auto
);
2586 /* From page 22 (page 28 of the PDF) of the GLSL 1.10 specification;
2588 * "Global variables can only use the qualifiers const,
2589 * attribute, uni form, or varying. Only one may be
2592 * Local variables can only use the qualifier const."
2594 * This is relaxed in GLSL 1.30. It is also relaxed by any extension
2595 * that adds the 'layout' keyword.
2597 if ((state
->language_version
< 130)
2598 && !state
->ARB_explicit_attrib_location_enable
2599 && !state
->ARB_fragment_coord_conventions_enable
) {
2600 if (this->type
->qualifier
.flags
.q
.out
) {
2601 _mesa_glsl_error(& loc
, state
,
2602 "`out' qualifier in declaration of `%s' "
2603 "only valid for function parameters in %s.",
2604 decl
->identifier
, state
->version_string
);
2606 if (this->type
->qualifier
.flags
.q
.in
) {
2607 _mesa_glsl_error(& loc
, state
,
2608 "`in' qualifier in declaration of `%s' "
2609 "only valid for function parameters in %s.",
2610 decl
->identifier
, state
->version_string
);
2612 /* FINISHME: Test for other invalid qualifiers. */
2615 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
,
2618 if (this->type
->qualifier
.flags
.q
.invariant
) {
2619 if ((state
->target
== vertex_shader
) && !(var
->mode
== ir_var_out
||
2620 var
->mode
== ir_var_inout
)) {
2621 /* FINISHME: Note that this doesn't work for invariant on
2622 * a function signature outval
2624 _mesa_glsl_error(& loc
, state
,
2625 "`%s' cannot be marked invariant, vertex shader "
2626 "outputs only\n", var
->name
);
2627 } else if ((state
->target
== fragment_shader
) &&
2628 !(var
->mode
== ir_var_in
|| var
->mode
== ir_var_inout
)) {
2629 /* FINISHME: Note that this doesn't work for invariant on
2630 * a function signature inval
2632 _mesa_glsl_error(& loc
, state
,
2633 "`%s' cannot be marked invariant, fragment shader "
2634 "inputs only\n", var
->name
);
2638 if (state
->current_function
!= NULL
) {
2639 const char *mode
= NULL
;
2640 const char *extra
= "";
2642 /* There is no need to check for 'inout' here because the parser will
2643 * only allow that in function parameter lists.
2645 if (this->type
->qualifier
.flags
.q
.attribute
) {
2647 } else if (this->type
->qualifier
.flags
.q
.uniform
) {
2649 } else if (this->type
->qualifier
.flags
.q
.varying
) {
2651 } else if (this->type
->qualifier
.flags
.q
.in
) {
2653 extra
= " or in function parameter list";
2654 } else if (this->type
->qualifier
.flags
.q
.out
) {
2656 extra
= " or in function parameter list";
2660 _mesa_glsl_error(& loc
, state
,
2661 "%s variable `%s' must be declared at "
2663 mode
, var
->name
, extra
);
2665 } else if (var
->mode
== ir_var_in
) {
2666 var
->read_only
= true;
2668 if (state
->target
== vertex_shader
) {
2669 bool error_emitted
= false;
2671 /* From page 31 (page 37 of the PDF) of the GLSL 1.50 spec:
2673 * "Vertex shader inputs can only be float, floating-point
2674 * vectors, matrices, signed and unsigned integers and integer
2675 * vectors. Vertex shader inputs can also form arrays of these
2676 * types, but not structures."
2678 * From page 31 (page 27 of the PDF) of the GLSL 1.30 spec:
2680 * "Vertex shader inputs can only be float, floating-point
2681 * vectors, matrices, signed and unsigned integers and integer
2682 * vectors. They cannot be arrays or structures."
2684 * From page 23 (page 29 of the PDF) of the GLSL 1.20 spec:
2686 * "The attribute qualifier can be used only with float,
2687 * floating-point vectors, and matrices. Attribute variables
2688 * cannot be declared as arrays or structures."
2690 const glsl_type
*check_type
= var
->type
->is_array()
2691 ? var
->type
->fields
.array
: var
->type
;
2693 switch (check_type
->base_type
) {
2694 case GLSL_TYPE_FLOAT
:
2696 case GLSL_TYPE_UINT
:
2698 if (state
->language_version
> 120)
2702 _mesa_glsl_error(& loc
, state
,
2703 "vertex shader input / attribute cannot have "
2705 var
->type
->is_array() ? "array of " : "",
2707 error_emitted
= true;
2710 if (!error_emitted
&& (state
->language_version
<= 130)
2711 && var
->type
->is_array()) {
2712 _mesa_glsl_error(& loc
, state
,
2713 "vertex shader input / attribute cannot have "
2715 error_emitted
= true;
2720 /* Integer vertex outputs must be qualified with 'flat'.
2722 * From section 4.3.6 of the GLSL 1.30 spec:
2723 * "If a vertex output is a signed or unsigned integer or integer
2724 * vector, then it must be qualified with the interpolation qualifier
2727 if (state
->language_version
>= 130
2728 && state
->target
== vertex_shader
2729 && state
->current_function
== NULL
2730 && var
->type
->is_integer()
2731 && var
->mode
== ir_var_out
2732 && var
->interpolation
!= INTERP_QUALIFIER_FLAT
) {
2734 _mesa_glsl_error(&loc
, state
, "If a vertex output is an integer, "
2735 "then it must be qualified with 'flat'");
2739 /* Interpolation qualifiers cannot be applied to 'centroid' and
2740 * 'centroid varying'.
2742 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
2743 * "interpolation qualifiers may only precede the qualifiers in,
2744 * centroid in, out, or centroid out in a declaration. They do not apply
2745 * to the deprecated storage qualifiers varying or centroid varying."
2747 if (state
->language_version
>= 130
2748 && this->type
->qualifier
.has_interpolation()
2749 && this->type
->qualifier
.flags
.q
.varying
) {
2751 const char *i
= this->type
->qualifier
.interpolation_string();
2754 if (this->type
->qualifier
.flags
.q
.centroid
)
2755 s
= "centroid varying";
2759 _mesa_glsl_error(&loc
, state
,
2760 "qualifier '%s' cannot be applied to the "
2761 "deprecated storage qualifier '%s'", i
, s
);
2765 /* Interpolation qualifiers can only apply to vertex shader outputs and
2766 * fragment shader inputs.
2768 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
2769 * "Outputs from a vertex shader (out) and inputs to a fragment
2770 * shader (in) can be further qualified with one or more of these
2771 * interpolation qualifiers"
2773 if (state
->language_version
>= 130
2774 && this->type
->qualifier
.has_interpolation()) {
2776 const char *i
= this->type
->qualifier
.interpolation_string();
2779 switch (state
->target
) {
2781 if (this->type
->qualifier
.flags
.q
.in
) {
2782 _mesa_glsl_error(&loc
, state
,
2783 "qualifier '%s' cannot be applied to vertex "
2784 "shader inputs", i
);
2787 case fragment_shader
:
2788 if (this->type
->qualifier
.flags
.q
.out
) {
2789 _mesa_glsl_error(&loc
, state
,
2790 "qualifier '%s' cannot be applied to fragment "
2791 "shader outputs", i
);
2800 /* From section 4.3.4 of the GLSL 1.30 spec:
2801 * "It is an error to use centroid in in a vertex shader."
2803 if (state
->language_version
>= 130
2804 && this->type
->qualifier
.flags
.q
.centroid
2805 && this->type
->qualifier
.flags
.q
.in
2806 && state
->target
== vertex_shader
) {
2808 _mesa_glsl_error(&loc
, state
,
2809 "'centroid in' cannot be used in a vertex shader");
2813 /* Precision qualifiers exists only in GLSL versions 1.00 and >= 1.30.
2815 if (this->type
->specifier
->precision
!= ast_precision_none
2816 && state
->language_version
!= 100
2817 && state
->language_version
< 130) {
2819 _mesa_glsl_error(&loc
, state
,
2820 "precision qualifiers are supported only in GLSL ES "
2821 "1.00, and GLSL 1.30 and later");
2825 /* Precision qualifiers only apply to floating point and integer types.
2827 * From section 4.5.2 of the GLSL 1.30 spec:
2828 * "Any floating point or any integer declaration can have the type
2829 * preceded by one of these precision qualifiers [...] Literal
2830 * constants do not have precision qualifiers. Neither do Boolean
2833 * In GLSL ES, sampler types are also allowed.
2835 * From page 87 of the GLSL ES spec:
2836 * "RESOLUTION: Allow sampler types to take a precision qualifier."
2838 if (this->type
->specifier
->precision
!= ast_precision_none
2839 && !var
->type
->is_float()
2840 && !var
->type
->is_integer()
2841 && !(var
->type
->is_sampler() && state
->es_shader
)
2842 && !(var
->type
->is_array()
2843 && (var
->type
->fields
.array
->is_float()
2844 || var
->type
->fields
.array
->is_integer()))) {
2846 _mesa_glsl_error(&loc
, state
,
2847 "precision qualifiers apply only to floating point"
2848 "%s types", state
->es_shader
? ", integer, and sampler"
2852 /* From page 17 (page 23 of the PDF) of the GLSL 1.20 spec:
2854 * "[Sampler types] can only be declared as function
2855 * parameters or uniform variables (see Section 4.3.5
2858 if (var_type
->contains_sampler() &&
2859 !this->type
->qualifier
.flags
.q
.uniform
) {
2860 _mesa_glsl_error(&loc
, state
, "samplers must be declared uniform");
2863 /* Process the initializer and add its instructions to a temporary
2864 * list. This list will be added to the instruction stream (below) after
2865 * the declaration is added. This is done because in some cases (such as
2866 * redeclarations) the declaration may not actually be added to the
2867 * instruction stream.
2869 exec_list initializer_instructions
;
2870 ir_variable
*earlier
= get_variable_being_redeclared(var
, decl
, state
);
2872 if (decl
->initializer
!= NULL
) {
2873 result
= process_initializer((earlier
== NULL
) ? var
: earlier
,
2875 &initializer_instructions
, state
);
2878 /* From page 23 (page 29 of the PDF) of the GLSL 1.10 spec:
2880 * "It is an error to write to a const variable outside of
2881 * its declaration, so they must be initialized when
2884 if (this->type
->qualifier
.flags
.q
.constant
&& decl
->initializer
== NULL
) {
2885 _mesa_glsl_error(& loc
, state
,
2886 "const declaration of `%s' must be initialized",
2890 /* If the declaration is not a redeclaration, there are a few additional
2891 * semantic checks that must be applied. In addition, variable that was
2892 * created for the declaration should be added to the IR stream.
2894 if (earlier
== NULL
) {
2895 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
2897 * "Identifiers starting with "gl_" are reserved for use by
2898 * OpenGL, and may not be declared in a shader as either a
2899 * variable or a function."
2901 if (strncmp(decl
->identifier
, "gl_", 3) == 0)
2902 _mesa_glsl_error(& loc
, state
,
2903 "identifier `%s' uses reserved `gl_' prefix",
2905 else if (strstr(decl
->identifier
, "__")) {
2906 /* From page 14 (page 20 of the PDF) of the GLSL 1.10
2909 * "In addition, all identifiers containing two
2910 * consecutive underscores (__) are reserved as
2911 * possible future keywords."
2913 _mesa_glsl_error(& loc
, state
,
2914 "identifier `%s' uses reserved `__' string",
2918 /* Add the variable to the symbol table. Note that the initializer's
2919 * IR was already processed earlier (though it hasn't been emitted
2920 * yet), without the variable in scope.
2922 * This differs from most C-like languages, but it follows the GLSL
2923 * specification. From page 28 (page 34 of the PDF) of the GLSL 1.50
2926 * "Within a declaration, the scope of a name starts immediately
2927 * after the initializer if present or immediately after the name
2928 * being declared if not."
2930 if (!state
->symbols
->add_variable(var
)) {
2931 YYLTYPE loc
= this->get_location();
2932 _mesa_glsl_error(&loc
, state
, "name `%s' already taken in the "
2933 "current scope", decl
->identifier
);
2937 /* Push the variable declaration to the top. It means that all the
2938 * variable declarations will appear in a funny last-to-first order,
2939 * but otherwise we run into trouble if a function is prototyped, a
2940 * global var is decled, then the function is defined with usage of
2941 * the global var. See glslparsertest's CorrectModule.frag.
2943 instructions
->push_head(var
);
2946 instructions
->append_list(&initializer_instructions
);
2950 /* Generally, variable declarations do not have r-values. However,
2951 * one is used for the declaration in
2953 * while (bool b = some_condition()) {
2957 * so we return the rvalue from the last seen declaration here.
2964 ast_parameter_declarator::hir(exec_list
*instructions
,
2965 struct _mesa_glsl_parse_state
*state
)
2968 const struct glsl_type
*type
;
2969 const char *name
= NULL
;
2970 YYLTYPE loc
= this->get_location();
2972 type
= this->type
->specifier
->glsl_type(& name
, state
);
2976 _mesa_glsl_error(& loc
, state
,
2977 "invalid type `%s' in declaration of `%s'",
2978 name
, this->identifier
);
2980 _mesa_glsl_error(& loc
, state
,
2981 "invalid type in declaration of `%s'",
2985 type
= glsl_type::error_type
;
2988 /* From page 62 (page 68 of the PDF) of the GLSL 1.50 spec:
2990 * "Functions that accept no input arguments need not use void in the
2991 * argument list because prototypes (or definitions) are required and
2992 * therefore there is no ambiguity when an empty argument list "( )" is
2993 * declared. The idiom "(void)" as a parameter list is provided for
2996 * Placing this check here prevents a void parameter being set up
2997 * for a function, which avoids tripping up checks for main taking
2998 * parameters and lookups of an unnamed symbol.
3000 if (type
->is_void()) {
3001 if (this->identifier
!= NULL
)
3002 _mesa_glsl_error(& loc
, state
,
3003 "named parameter cannot have type `void'");
3009 if (formal_parameter
&& (this->identifier
== NULL
)) {
3010 _mesa_glsl_error(& loc
, state
, "formal parameter lacks a name");
3014 /* This only handles "vec4 foo[..]". The earlier specifier->glsl_type(...)
3015 * call already handled the "vec4[..] foo" case.
3017 if (this->is_array
) {
3018 type
= process_array_type(&loc
, type
, this->array_size
, state
);
3021 if (!type
->is_error() && type
->array_size() == 0) {
3022 _mesa_glsl_error(&loc
, state
, "arrays passed as parameters must have "
3023 "a declared size.");
3024 type
= glsl_type::error_type
;
3028 ir_variable
*var
= new(ctx
) ir_variable(type
, this->identifier
, ir_var_in
);
3030 /* Apply any specified qualifiers to the parameter declaration. Note that
3031 * for function parameters the default mode is 'in'.
3033 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
, & loc
);
3035 /* From page 17 (page 23 of the PDF) of the GLSL 1.20 spec:
3037 * "Samplers cannot be treated as l-values; hence cannot be used
3038 * as out or inout function parameters, nor can they be assigned
3041 if ((var
->mode
== ir_var_inout
|| var
->mode
== ir_var_out
)
3042 && type
->contains_sampler()) {
3043 _mesa_glsl_error(&loc
, state
, "out and inout parameters cannot contain samplers");
3044 type
= glsl_type::error_type
;
3047 /* From page 39 (page 45 of the PDF) of the GLSL 1.10 spec:
3049 * "When calling a function, expressions that do not evaluate to
3050 * l-values cannot be passed to parameters declared as out or inout."
3052 * From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
3054 * "Other binary or unary expressions, non-dereferenced arrays,
3055 * function names, swizzles with repeated fields, and constants
3056 * cannot be l-values."
3058 * So for GLSL 1.10, passing an array as an out or inout parameter is not
3059 * allowed. This restriction is removed in GLSL 1.20, and in GLSL ES.
3061 if ((var
->mode
== ir_var_inout
|| var
->mode
== ir_var_out
)
3062 && type
->is_array() && state
->language_version
== 110) {
3063 _mesa_glsl_error(&loc
, state
, "Arrays cannot be out or inout parameters in GLSL 1.10");
3064 type
= glsl_type::error_type
;
3067 instructions
->push_tail(var
);
3069 /* Parameter declarations do not have r-values.
3076 ast_parameter_declarator::parameters_to_hir(exec_list
*ast_parameters
,
3078 exec_list
*ir_parameters
,
3079 _mesa_glsl_parse_state
*state
)
3081 ast_parameter_declarator
*void_param
= NULL
;
3084 foreach_list_typed (ast_parameter_declarator
, param
, link
, ast_parameters
) {
3085 param
->formal_parameter
= formal
;
3086 param
->hir(ir_parameters
, state
);
3094 if ((void_param
!= NULL
) && (count
> 1)) {
3095 YYLTYPE loc
= void_param
->get_location();
3097 _mesa_glsl_error(& loc
, state
,
3098 "`void' parameter must be only parameter");
3104 emit_function(_mesa_glsl_parse_state
*state
, ir_function
*f
)
3106 /* IR invariants disallow function declarations or definitions
3107 * nested within other function definitions. But there is no
3108 * requirement about the relative order of function declarations
3109 * and definitions with respect to one another. So simply insert
3110 * the new ir_function block at the end of the toplevel instruction
3113 state
->toplevel_ir
->push_tail(f
);
3118 ast_function::hir(exec_list
*instructions
,
3119 struct _mesa_glsl_parse_state
*state
)
3122 ir_function
*f
= NULL
;
3123 ir_function_signature
*sig
= NULL
;
3124 exec_list hir_parameters
;
3126 const char *const name
= identifier
;
3128 /* New functions are always added to the top-level IR instruction stream,
3129 * so this instruction list pointer is ignored. See also emit_function
3132 (void) instructions
;
3134 /* From page 21 (page 27 of the PDF) of the GLSL 1.20 spec,
3136 * "Function declarations (prototypes) cannot occur inside of functions;
3137 * they must be at global scope, or for the built-in functions, outside
3138 * the global scope."
3140 * From page 27 (page 33 of the PDF) of the GLSL ES 1.00.16 spec,
3142 * "User defined functions may only be defined within the global scope."
3144 * Note that this language does not appear in GLSL 1.10.
3146 if ((state
->current_function
!= NULL
) && (state
->language_version
!= 110)) {
3147 YYLTYPE loc
= this->get_location();
3148 _mesa_glsl_error(&loc
, state
,
3149 "declaration of function `%s' not allowed within "
3150 "function body", name
);
3153 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
3155 * "Identifiers starting with "gl_" are reserved for use by
3156 * OpenGL, and may not be declared in a shader as either a
3157 * variable or a function."
3159 if (strncmp(name
, "gl_", 3) == 0) {
3160 YYLTYPE loc
= this->get_location();
3161 _mesa_glsl_error(&loc
, state
,
3162 "identifier `%s' uses reserved `gl_' prefix", name
);
3165 /* Convert the list of function parameters to HIR now so that they can be
3166 * used below to compare this function's signature with previously seen
3167 * signatures for functions with the same name.
3169 ast_parameter_declarator::parameters_to_hir(& this->parameters
,
3171 & hir_parameters
, state
);
3173 const char *return_type_name
;
3174 const glsl_type
*return_type
=
3175 this->return_type
->specifier
->glsl_type(& return_type_name
, state
);
3178 YYLTYPE loc
= this->get_location();
3179 _mesa_glsl_error(&loc
, state
,
3180 "function `%s' has undeclared return type `%s'",
3181 name
, return_type_name
);
3182 return_type
= glsl_type::error_type
;
3185 /* From page 56 (page 62 of the PDF) of the GLSL 1.30 spec:
3186 * "No qualifier is allowed on the return type of a function."
3188 if (this->return_type
->has_qualifiers()) {
3189 YYLTYPE loc
= this->get_location();
3190 _mesa_glsl_error(& loc
, state
,
3191 "function `%s' return type has qualifiers", name
);
3194 /* From page 17 (page 23 of the PDF) of the GLSL 1.20 spec:
3196 * "[Sampler types] can only be declared as function parameters
3197 * or uniform variables (see Section 4.3.5 "Uniform")".
3199 if (return_type
->contains_sampler()) {
3200 YYLTYPE loc
= this->get_location();
3201 _mesa_glsl_error(&loc
, state
,
3202 "function `%s' return type can't contain a sampler",
3206 /* Verify that this function's signature either doesn't match a previously
3207 * seen signature for a function with the same name, or, if a match is found,
3208 * that the previously seen signature does not have an associated definition.
3210 f
= state
->symbols
->get_function(name
);
3211 if (f
!= NULL
&& (state
->es_shader
|| f
->has_user_signature())) {
3212 sig
= f
->exact_matching_signature(&hir_parameters
);
3214 const char *badvar
= sig
->qualifiers_match(&hir_parameters
);
3215 if (badvar
!= NULL
) {
3216 YYLTYPE loc
= this->get_location();
3218 _mesa_glsl_error(&loc
, state
, "function `%s' parameter `%s' "
3219 "qualifiers don't match prototype", name
, badvar
);
3222 if (sig
->return_type
!= return_type
) {
3223 YYLTYPE loc
= this->get_location();
3225 _mesa_glsl_error(&loc
, state
, "function `%s' return type doesn't "
3226 "match prototype", name
);
3229 if (is_definition
&& sig
->is_defined
) {
3230 YYLTYPE loc
= this->get_location();
3232 _mesa_glsl_error(& loc
, state
, "function `%s' redefined", name
);
3236 f
= new(ctx
) ir_function(name
);
3237 if (!state
->symbols
->add_function(f
)) {
3238 /* This function name shadows a non-function use of the same name. */
3239 YYLTYPE loc
= this->get_location();
3241 _mesa_glsl_error(&loc
, state
, "function name `%s' conflicts with "
3242 "non-function", name
);
3246 emit_function(state
, f
);
3249 /* Verify the return type of main() */
3250 if (strcmp(name
, "main") == 0) {
3251 if (! return_type
->is_void()) {
3252 YYLTYPE loc
= this->get_location();
3254 _mesa_glsl_error(& loc
, state
, "main() must return void");
3257 if (!hir_parameters
.is_empty()) {
3258 YYLTYPE loc
= this->get_location();
3260 _mesa_glsl_error(& loc
, state
, "main() must not take any parameters");
3264 /* Finish storing the information about this new function in its signature.
3267 sig
= new(ctx
) ir_function_signature(return_type
);
3268 f
->add_signature(sig
);
3271 sig
->replace_parameters(&hir_parameters
);
3274 /* Function declarations (prototypes) do not have r-values.
3281 ast_function_definition::hir(exec_list
*instructions
,
3282 struct _mesa_glsl_parse_state
*state
)
3284 prototype
->is_definition
= true;
3285 prototype
->hir(instructions
, state
);
3287 ir_function_signature
*signature
= prototype
->signature
;
3288 if (signature
== NULL
)
3291 assert(state
->current_function
== NULL
);
3292 state
->current_function
= signature
;
3293 state
->found_return
= false;
3295 /* Duplicate parameters declared in the prototype as concrete variables.
3296 * Add these to the symbol table.
3298 state
->symbols
->push_scope();
3299 foreach_iter(exec_list_iterator
, iter
, signature
->parameters
) {
3300 ir_variable
*const var
= ((ir_instruction
*) iter
.get())->as_variable();
3302 assert(var
!= NULL
);
3304 /* The only way a parameter would "exist" is if two parameters have
3307 if (state
->symbols
->name_declared_this_scope(var
->name
)) {
3308 YYLTYPE loc
= this->get_location();
3310 _mesa_glsl_error(& loc
, state
, "parameter `%s' redeclared", var
->name
);
3312 state
->symbols
->add_variable(var
);
3316 /* Convert the body of the function to HIR. */
3317 this->body
->hir(&signature
->body
, state
);
3318 signature
->is_defined
= true;
3320 state
->symbols
->pop_scope();
3322 assert(state
->current_function
== signature
);
3323 state
->current_function
= NULL
;
3325 if (!signature
->return_type
->is_void() && !state
->found_return
) {
3326 YYLTYPE loc
= this->get_location();
3327 _mesa_glsl_error(& loc
, state
, "function `%s' has non-void return type "
3328 "%s, but no return statement",
3329 signature
->function_name(),
3330 signature
->return_type
->name
);
3333 /* Function definitions do not have r-values.
3340 ast_jump_statement::hir(exec_list
*instructions
,
3341 struct _mesa_glsl_parse_state
*state
)
3348 assert(state
->current_function
);
3350 if (opt_return_value
) {
3351 ir_rvalue
*const ret
= opt_return_value
->hir(instructions
, state
);
3353 /* The value of the return type can be NULL if the shader says
3354 * 'return foo();' and foo() is a function that returns void.
3356 * NOTE: The GLSL spec doesn't say that this is an error. The type
3357 * of the return value is void. If the return type of the function is
3358 * also void, then this should compile without error. Seriously.
3360 const glsl_type
*const ret_type
=
3361 (ret
== NULL
) ? glsl_type::void_type
: ret
->type
;
3363 /* Implicit conversions are not allowed for return values. */
3364 if (state
->current_function
->return_type
!= ret_type
) {
3365 YYLTYPE loc
= this->get_location();
3367 _mesa_glsl_error(& loc
, state
,
3368 "`return' with wrong type %s, in function `%s' "
3371 state
->current_function
->function_name(),
3372 state
->current_function
->return_type
->name
);
3375 inst
= new(ctx
) ir_return(ret
);
3377 if (state
->current_function
->return_type
->base_type
!=
3379 YYLTYPE loc
= this->get_location();
3381 _mesa_glsl_error(& loc
, state
,
3382 "`return' with no value, in function %s returning "
3384 state
->current_function
->function_name());
3386 inst
= new(ctx
) ir_return
;
3389 state
->found_return
= true;
3390 instructions
->push_tail(inst
);
3395 if (state
->target
!= fragment_shader
) {
3396 YYLTYPE loc
= this->get_location();
3398 _mesa_glsl_error(& loc
, state
,
3399 "`discard' may only appear in a fragment shader");
3401 instructions
->push_tail(new(ctx
) ir_discard
);
3406 if (mode
== ast_continue
&&
3407 state
->loop_nesting_ast
== NULL
) {
3408 YYLTYPE loc
= this->get_location();
3410 _mesa_glsl_error(& loc
, state
,
3411 "continue may only appear in a loop");
3412 } else if (mode
== ast_break
&&
3413 state
->loop_nesting_ast
== NULL
&&
3414 state
->switch_state
.switch_nesting_ast
== NULL
) {
3415 YYLTYPE loc
= this->get_location();
3417 _mesa_glsl_error(& loc
, state
,
3418 "break may only appear in a loop or a switch");
3420 /* For a loop, inline the for loop expression again,
3421 * since we don't know where near the end of
3422 * the loop body the normal copy of it
3423 * is going to be placed.
3425 if (state
->loop_nesting_ast
!= NULL
&&
3426 mode
== ast_continue
&&
3427 state
->loop_nesting_ast
->rest_expression
) {
3428 state
->loop_nesting_ast
->rest_expression
->hir(instructions
,
3432 if (state
->switch_state
.is_switch_innermost
&&
3433 mode
== ast_break
) {
3434 /* Force break out of switch by setting is_break switch state.
3436 ir_variable
*const is_break_var
= state
->switch_state
.is_break_var
;
3437 ir_dereference_variable
*const deref_is_break_var
=
3438 new(ctx
) ir_dereference_variable(is_break_var
);
3439 ir_constant
*const true_val
= new(ctx
) ir_constant(true);
3440 ir_assignment
*const set_break_var
=
3441 new(ctx
) ir_assignment(deref_is_break_var
,
3445 instructions
->push_tail(set_break_var
);
3448 ir_loop_jump
*const jump
=
3449 new(ctx
) ir_loop_jump((mode
== ast_break
)
3450 ? ir_loop_jump::jump_break
3451 : ir_loop_jump::jump_continue
);
3452 instructions
->push_tail(jump
);
3459 /* Jump instructions do not have r-values.
3466 ast_selection_statement::hir(exec_list
*instructions
,
3467 struct _mesa_glsl_parse_state
*state
)
3471 ir_rvalue
*const condition
= this->condition
->hir(instructions
, state
);
3473 /* From page 66 (page 72 of the PDF) of the GLSL 1.50 spec:
3475 * "Any expression whose type evaluates to a Boolean can be used as the
3476 * conditional expression bool-expression. Vector types are not accepted
3477 * as the expression to if."
3479 * The checks are separated so that higher quality diagnostics can be
3480 * generated for cases where both rules are violated.
3482 if (!condition
->type
->is_boolean() || !condition
->type
->is_scalar()) {
3483 YYLTYPE loc
= this->condition
->get_location();
3485 _mesa_glsl_error(& loc
, state
, "if-statement condition must be scalar "
3489 ir_if
*const stmt
= new(ctx
) ir_if(condition
);
3491 if (then_statement
!= NULL
) {
3492 state
->symbols
->push_scope();
3493 then_statement
->hir(& stmt
->then_instructions
, state
);
3494 state
->symbols
->pop_scope();
3497 if (else_statement
!= NULL
) {
3498 state
->symbols
->push_scope();
3499 else_statement
->hir(& stmt
->else_instructions
, state
);
3500 state
->symbols
->pop_scope();
3503 instructions
->push_tail(stmt
);
3505 /* if-statements do not have r-values.
3512 ast_switch_statement::hir(exec_list
*instructions
,
3513 struct _mesa_glsl_parse_state
*state
)
3517 ir_rvalue
*const test_expression
=
3518 this->test_expression
->hir(instructions
, state
);
3520 /* From page 66 (page 55 of the PDF) of the GLSL 1.50 spec:
3522 * "The type of init-expression in a switch statement must be a
3525 * The checks are separated so that higher quality diagnostics can be
3526 * generated for cases where the rule is violated.
3528 if (!test_expression
->type
->is_integer()) {
3529 YYLTYPE loc
= this->test_expression
->get_location();
3531 _mesa_glsl_error(& loc
,
3533 "switch-statement expression must be scalar "
3537 /* Track the switch-statement nesting in a stack-like manner.
3539 struct glsl_switch_state saved
= state
->switch_state
;
3541 state
->switch_state
.is_switch_innermost
= true;
3542 state
->switch_state
.switch_nesting_ast
= this;
3543 state
->switch_state
.labels_ht
= hash_table_ctor(0, hash_table_pointer_hash
,
3544 hash_table_pointer_compare
);
3545 state
->switch_state
.previous_default
= NULL
;
3547 /* Initalize is_fallthru state to false.
3549 ir_rvalue
*const is_fallthru_val
= new (ctx
) ir_constant(false);
3550 state
->switch_state
.is_fallthru_var
=
3551 new(ctx
) ir_variable(glsl_type::bool_type
,
3552 "switch_is_fallthru_tmp",
3554 instructions
->push_tail(state
->switch_state
.is_fallthru_var
);
3556 ir_dereference_variable
*deref_is_fallthru_var
=
3557 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
3558 instructions
->push_tail(new(ctx
) ir_assignment(deref_is_fallthru_var
,
3562 /* Initalize is_break state to false.
3564 ir_rvalue
*const is_break_val
= new (ctx
) ir_constant(false);
3565 state
->switch_state
.is_break_var
= new(ctx
) ir_variable(glsl_type::bool_type
,
3566 "switch_is_break_tmp",
3568 instructions
->push_tail(state
->switch_state
.is_break_var
);
3570 ir_dereference_variable
*deref_is_break_var
=
3571 new(ctx
) ir_dereference_variable(state
->switch_state
.is_break_var
);
3572 instructions
->push_tail(new(ctx
) ir_assignment(deref_is_break_var
,
3576 /* Cache test expression.
3578 test_to_hir(instructions
, state
);
3580 /* Emit code for body of switch stmt.
3582 body
->hir(instructions
, state
);
3584 hash_table_dtor(state
->switch_state
.labels_ht
);
3586 state
->switch_state
= saved
;
3588 /* Switch statements do not have r-values.
3595 ast_switch_statement::test_to_hir(exec_list
*instructions
,
3596 struct _mesa_glsl_parse_state
*state
)
3600 /* Cache value of test expression.
3602 ir_rvalue
*const test_val
=
3603 test_expression
->hir(instructions
,
3606 state
->switch_state
.test_var
= new(ctx
) ir_variable(glsl_type::int_type
,
3609 ir_dereference_variable
*deref_test_var
=
3610 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
3612 instructions
->push_tail(state
->switch_state
.test_var
);
3613 instructions
->push_tail(new(ctx
) ir_assignment(deref_test_var
,
3620 ast_switch_body::hir(exec_list
*instructions
,
3621 struct _mesa_glsl_parse_state
*state
)
3624 stmts
->hir(instructions
, state
);
3626 /* Switch bodies do not have r-values.
3633 ast_case_statement_list::hir(exec_list
*instructions
,
3634 struct _mesa_glsl_parse_state
*state
)
3636 foreach_list_typed (ast_case_statement
, case_stmt
, link
, & this->cases
)
3637 case_stmt
->hir(instructions
, state
);
3639 /* Case statements do not have r-values.
3646 ast_case_statement::hir(exec_list
*instructions
,
3647 struct _mesa_glsl_parse_state
*state
)
3649 labels
->hir(instructions
, state
);
3651 /* Conditionally set fallthru state based on break state.
3653 ir_constant
*const false_val
= new(state
) ir_constant(false);
3654 ir_dereference_variable
*const deref_is_fallthru_var
=
3655 new(state
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
3656 ir_dereference_variable
*const deref_is_break_var
=
3657 new(state
) ir_dereference_variable(state
->switch_state
.is_break_var
);
3658 ir_assignment
*const reset_fallthru_on_break
=
3659 new(state
) ir_assignment(deref_is_fallthru_var
,
3661 deref_is_break_var
);
3662 instructions
->push_tail(reset_fallthru_on_break
);
3664 /* Guard case statements depending on fallthru state.
3666 ir_dereference_variable
*const deref_fallthru_guard
=
3667 new(state
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
3668 ir_if
*const test_fallthru
= new(state
) ir_if(deref_fallthru_guard
);
3670 foreach_list_typed (ast_node
, stmt
, link
, & this->stmts
)
3671 stmt
->hir(& test_fallthru
->then_instructions
, state
);
3673 instructions
->push_tail(test_fallthru
);
3675 /* Case statements do not have r-values.
3682 ast_case_label_list::hir(exec_list
*instructions
,
3683 struct _mesa_glsl_parse_state
*state
)
3685 foreach_list_typed (ast_case_label
, label
, link
, & this->labels
)
3686 label
->hir(instructions
, state
);
3688 /* Case labels do not have r-values.
3695 ast_case_label::hir(exec_list
*instructions
,
3696 struct _mesa_glsl_parse_state
*state
)
3700 ir_dereference_variable
*deref_fallthru_var
=
3701 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
3703 ir_rvalue
*const true_val
= new(ctx
) ir_constant(true);
3705 /* If not default case, ...
3707 if (this->test_value
!= NULL
) {
3708 /* Conditionally set fallthru state based on
3709 * comparison of cached test expression value to case label.
3711 ir_rvalue
*const label_rval
= this->test_value
->hir(instructions
, state
);
3712 ir_constant
*label_const
= label_rval
->constant_expression_value();
3715 YYLTYPE loc
= this->test_value
->get_location();
3717 _mesa_glsl_error(& loc
, state
,
3718 "switch statement case label must be a "
3719 "constant expression");
3721 /* Stuff a dummy value in to allow processing to continue. */
3722 label_const
= new(ctx
) ir_constant(0);
3724 ast_expression
*previous_label
= (ast_expression
*)
3725 hash_table_find(state
->switch_state
.labels_ht
,
3726 (void *)(uintptr_t)label_const
->value
.u
[0]);
3728 if (previous_label
) {
3729 YYLTYPE loc
= this->test_value
->get_location();
3730 _mesa_glsl_error(& loc
, state
,
3731 "duplicate case value");
3733 loc
= previous_label
->get_location();
3734 _mesa_glsl_error(& loc
, state
,
3735 "this is the previous case label");
3737 hash_table_insert(state
->switch_state
.labels_ht
,
3739 (void *)(uintptr_t)label_const
->value
.u
[0]);
3743 ir_dereference_variable
*deref_test_var
=
3744 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
3746 ir_rvalue
*const test_cond
= new(ctx
) ir_expression(ir_binop_all_equal
,
3747 glsl_type::bool_type
,
3751 ir_assignment
*set_fallthru_on_test
=
3752 new(ctx
) ir_assignment(deref_fallthru_var
,
3756 instructions
->push_tail(set_fallthru_on_test
);
3757 } else { /* default case */
3758 if (state
->switch_state
.previous_default
) {
3760 YYLTYPE loc
= this->get_location();
3761 _mesa_glsl_error(& loc
, state
,
3762 "multiple default labels in one switch");
3766 loc
= state
->switch_state
.previous_default
->get_location();
3767 _mesa_glsl_error(& loc
, state
,
3768 "this is the first default label");
3770 state
->switch_state
.previous_default
= this;
3772 /* Set falltrhu state.
3774 ir_assignment
*set_fallthru
=
3775 new(ctx
) ir_assignment(deref_fallthru_var
,
3779 instructions
->push_tail(set_fallthru
);
3782 /* Case statements do not have r-values.
3789 ast_iteration_statement::condition_to_hir(ir_loop
*stmt
,
3790 struct _mesa_glsl_parse_state
*state
)
3794 if (condition
!= NULL
) {
3795 ir_rvalue
*const cond
=
3796 condition
->hir(& stmt
->body_instructions
, state
);
3799 || !cond
->type
->is_boolean() || !cond
->type
->is_scalar()) {
3800 YYLTYPE loc
= condition
->get_location();
3802 _mesa_glsl_error(& loc
, state
,
3803 "loop condition must be scalar boolean");
3805 /* As the first code in the loop body, generate a block that looks
3806 * like 'if (!condition) break;' as the loop termination condition.
3808 ir_rvalue
*const not_cond
=
3809 new(ctx
) ir_expression(ir_unop_logic_not
, glsl_type::bool_type
, cond
,
3812 ir_if
*const if_stmt
= new(ctx
) ir_if(not_cond
);
3814 ir_jump
*const break_stmt
=
3815 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
3817 if_stmt
->then_instructions
.push_tail(break_stmt
);
3818 stmt
->body_instructions
.push_tail(if_stmt
);
3825 ast_iteration_statement::hir(exec_list
*instructions
,
3826 struct _mesa_glsl_parse_state
*state
)
3830 /* For-loops and while-loops start a new scope, but do-while loops do not.
3832 if (mode
!= ast_do_while
)
3833 state
->symbols
->push_scope();
3835 if (init_statement
!= NULL
)
3836 init_statement
->hir(instructions
, state
);
3838 ir_loop
*const stmt
= new(ctx
) ir_loop();
3839 instructions
->push_tail(stmt
);
3841 /* Track the current loop nesting.
3843 ast_iteration_statement
*nesting_ast
= state
->loop_nesting_ast
;
3845 state
->loop_nesting_ast
= this;
3847 /* Likewise, indicate that following code is closest to a loop,
3848 * NOT closest to a switch.
3850 bool saved_is_switch_innermost
= state
->switch_state
.is_switch_innermost
;
3851 state
->switch_state
.is_switch_innermost
= false;
3853 if (mode
!= ast_do_while
)
3854 condition_to_hir(stmt
, state
);
3857 body
->hir(& stmt
->body_instructions
, state
);
3859 if (rest_expression
!= NULL
)
3860 rest_expression
->hir(& stmt
->body_instructions
, state
);
3862 if (mode
== ast_do_while
)
3863 condition_to_hir(stmt
, state
);
3865 if (mode
!= ast_do_while
)
3866 state
->symbols
->pop_scope();
3868 /* Restore previous nesting before returning.
3870 state
->loop_nesting_ast
= nesting_ast
;
3871 state
->switch_state
.is_switch_innermost
= saved_is_switch_innermost
;
3873 /* Loops do not have r-values.
3880 ast_type_specifier::hir(exec_list
*instructions
,
3881 struct _mesa_glsl_parse_state
*state
)
3883 if (!this->is_precision_statement
&& this->structure
== NULL
)
3886 YYLTYPE loc
= this->get_location();
3888 if (this->precision
!= ast_precision_none
3889 && state
->language_version
!= 100
3890 && state
->language_version
< 130) {
3891 _mesa_glsl_error(&loc
, state
,
3892 "precision qualifiers exist only in "
3893 "GLSL ES 1.00, and GLSL 1.30 and later");
3896 if (this->precision
!= ast_precision_none
3897 && this->structure
!= NULL
) {
3898 _mesa_glsl_error(&loc
, state
,
3899 "precision qualifiers do not apply to structures");
3903 /* If this is a precision statement, check that the type to which it is
3904 * applied is either float or int.
3906 * From section 4.5.3 of the GLSL 1.30 spec:
3907 * "The precision statement
3908 * precision precision-qualifier type;
3909 * can be used to establish a default precision qualifier. The type
3910 * field can be either int or float [...]. Any other types or
3911 * qualifiers will result in an error.
3913 if (this->is_precision_statement
) {
3914 assert(this->precision
!= ast_precision_none
);
3915 assert(this->structure
== NULL
); /* The check for structures was
3916 * performed above. */
3917 if (this->is_array
) {
3918 _mesa_glsl_error(&loc
, state
,
3919 "default precision statements do not apply to "
3923 if (strcmp(this->type_name
, "float") != 0 &&
3924 strcmp(this->type_name
, "int") != 0) {
3925 _mesa_glsl_error(&loc
, state
,
3926 "default precision statements apply only to types "
3931 /* FINISHME: Translate precision statements into IR. */
3935 if (this->structure
!= NULL
)
3936 return this->structure
->hir(instructions
, state
);
3943 ast_struct_specifier::hir(exec_list
*instructions
,
3944 struct _mesa_glsl_parse_state
*state
)
3946 unsigned decl_count
= 0;
3948 /* Make an initial pass over the list of structure fields to determine how
3949 * many there are. Each element in this list is an ast_declarator_list.
3950 * This means that we actually need to count the number of elements in the
3951 * 'declarations' list in each of the elements.
3953 foreach_list_typed (ast_declarator_list
, decl_list
, link
,
3954 &this->declarations
) {
3955 foreach_list_const (decl_ptr
, & decl_list
->declarations
) {
3960 /* Allocate storage for the structure fields and process the field
3961 * declarations. As the declarations are processed, try to also convert
3962 * the types to HIR. This ensures that structure definitions embedded in
3963 * other structure definitions are processed.
3965 glsl_struct_field
*const fields
= ralloc_array(state
, glsl_struct_field
,
3969 foreach_list_typed (ast_declarator_list
, decl_list
, link
,
3970 &this->declarations
) {
3971 const char *type_name
;
3973 decl_list
->type
->specifier
->hir(instructions
, state
);
3975 /* Section 10.9 of the GLSL ES 1.00 specification states that
3976 * embedded structure definitions have been removed from the language.
3978 if (state
->es_shader
&& decl_list
->type
->specifier
->structure
!= NULL
) {
3979 YYLTYPE loc
= this->get_location();
3980 _mesa_glsl_error(&loc
, state
, "Embedded structure definitions are "
3981 "not allowed in GLSL ES 1.00.");
3984 const glsl_type
*decl_type
=
3985 decl_list
->type
->specifier
->glsl_type(& type_name
, state
);
3987 foreach_list_typed (ast_declaration
, decl
, link
,
3988 &decl_list
->declarations
) {
3989 const struct glsl_type
*field_type
= decl_type
;
3990 if (decl
->is_array
) {
3991 YYLTYPE loc
= decl
->get_location();
3992 field_type
= process_array_type(&loc
, decl_type
, decl
->array_size
,
3995 fields
[i
].type
= (field_type
!= NULL
)
3996 ? field_type
: glsl_type::error_type
;
3997 fields
[i
].name
= decl
->identifier
;
4002 assert(i
== decl_count
);
4004 const glsl_type
*t
=
4005 glsl_type::get_record_instance(fields
, decl_count
, this->name
);
4007 YYLTYPE loc
= this->get_location();
4008 if (!state
->symbols
->add_type(name
, t
)) {
4009 _mesa_glsl_error(& loc
, state
, "struct `%s' previously defined", name
);
4011 const glsl_type
**s
= reralloc(state
, state
->user_structures
,
4013 state
->num_user_structures
+ 1);
4015 s
[state
->num_user_structures
] = t
;
4016 state
->user_structures
= s
;
4017 state
->num_user_structures
++;
4021 /* Structure type definitions do not have r-values.
4027 detect_conflicting_assignments(struct _mesa_glsl_parse_state
*state
,
4028 exec_list
*instructions
)
4030 bool gl_FragColor_assigned
= false;
4031 bool gl_FragData_assigned
= false;
4032 bool user_defined_fs_output_assigned
= false;
4033 ir_variable
*user_defined_fs_output
= NULL
;
4035 /* It would be nice to have proper location information. */
4037 memset(&loc
, 0, sizeof(loc
));
4039 foreach_list(node
, instructions
) {
4040 ir_variable
*var
= ((ir_instruction
*)node
)->as_variable();
4042 if (!var
|| !var
->assigned
)
4045 if (strcmp(var
->name
, "gl_FragColor") == 0)
4046 gl_FragColor_assigned
= true;
4047 else if (strcmp(var
->name
, "gl_FragData") == 0)
4048 gl_FragData_assigned
= true;
4049 else if (strncmp(var
->name
, "gl_", 3) != 0) {
4050 if (state
->target
== fragment_shader
&&
4051 (var
->mode
== ir_var_out
|| var
->mode
== ir_var_inout
)) {
4052 user_defined_fs_output_assigned
= true;
4053 user_defined_fs_output
= var
;
4058 /* From the GLSL 1.30 spec:
4060 * "If a shader statically assigns a value to gl_FragColor, it
4061 * may not assign a value to any element of gl_FragData. If a
4062 * shader statically writes a value to any element of
4063 * gl_FragData, it may not assign a value to
4064 * gl_FragColor. That is, a shader may assign values to either
4065 * gl_FragColor or gl_FragData, but not both. Multiple shaders
4066 * linked together must also consistently write just one of
4067 * these variables. Similarly, if user declared output
4068 * variables are in use (statically assigned to), then the
4069 * built-in variables gl_FragColor and gl_FragData may not be
4070 * assigned to. These incorrect usages all generate compile
4073 if (gl_FragColor_assigned
&& gl_FragData_assigned
) {
4074 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
4075 "`gl_FragColor' and `gl_FragData'\n");
4076 } else if (gl_FragColor_assigned
&& user_defined_fs_output_assigned
) {
4077 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
4078 "`gl_FragColor' and `%s'\n",
4079 user_defined_fs_output
->name
);
4080 } else if (gl_FragData_assigned
&& user_defined_fs_output_assigned
) {
4081 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
4082 "`gl_FragData' and `%s'\n",
4083 user_defined_fs_output
->name
);