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
, rhs
));
764 deref_var
= new(ctx
) ir_dereference_variable(var
);
767 instructions
->push_tail(new(ctx
) ir_assignment(lhs
, deref_var
));
769 return new(ctx
) ir_dereference_variable(var
);
773 get_lvalue_copy(exec_list
*instructions
, ir_rvalue
*lvalue
)
775 void *ctx
= ralloc_parent(lvalue
);
778 var
= new(ctx
) ir_variable(lvalue
->type
, "_post_incdec_tmp",
780 instructions
->push_tail(var
);
781 var
->mode
= ir_var_auto
;
783 instructions
->push_tail(new(ctx
) ir_assignment(new(ctx
) ir_dereference_variable(var
),
786 return new(ctx
) ir_dereference_variable(var
);
791 ast_node::hir(exec_list
*instructions
,
792 struct _mesa_glsl_parse_state
*state
)
801 do_comparison(void *mem_ctx
, int operation
, ir_rvalue
*op0
, ir_rvalue
*op1
)
804 ir_rvalue
*cmp
= NULL
;
806 if (operation
== ir_binop_all_equal
)
807 join_op
= ir_binop_logic_and
;
809 join_op
= ir_binop_logic_or
;
811 switch (op0
->type
->base_type
) {
812 case GLSL_TYPE_FLOAT
:
816 return new(mem_ctx
) ir_expression(operation
, op0
, op1
);
818 case GLSL_TYPE_ARRAY
: {
819 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
820 ir_rvalue
*e0
, *e1
, *result
;
822 e0
= new(mem_ctx
) ir_dereference_array(op0
->clone(mem_ctx
, NULL
),
823 new(mem_ctx
) ir_constant(i
));
824 e1
= new(mem_ctx
) ir_dereference_array(op1
->clone(mem_ctx
, NULL
),
825 new(mem_ctx
) ir_constant(i
));
826 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
829 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
835 mark_whole_array_access(op0
);
836 mark_whole_array_access(op1
);
840 case GLSL_TYPE_STRUCT
: {
841 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
842 ir_rvalue
*e0
, *e1
, *result
;
843 const char *field_name
= op0
->type
->fields
.structure
[i
].name
;
845 e0
= new(mem_ctx
) ir_dereference_record(op0
->clone(mem_ctx
, NULL
),
847 e1
= new(mem_ctx
) ir_dereference_record(op1
->clone(mem_ctx
, NULL
),
849 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
852 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
860 case GLSL_TYPE_ERROR
:
862 case GLSL_TYPE_SAMPLER
:
863 /* I assume a comparison of a struct containing a sampler just
864 * ignores the sampler present in the type.
869 assert(!"Should not get here.");
874 cmp
= new(mem_ctx
) ir_constant(true);
879 /* For logical operations, we want to ensure that the operands are
880 * scalar booleans. If it isn't, emit an error and return a constant
881 * boolean to avoid triggering cascading error messages.
884 get_scalar_boolean_operand(exec_list
*instructions
,
885 struct _mesa_glsl_parse_state
*state
,
886 ast_expression
*parent_expr
,
888 const char *operand_name
,
891 ast_expression
*expr
= parent_expr
->subexpressions
[operand
];
893 ir_rvalue
*val
= expr
->hir(instructions
, state
);
895 if (val
->type
->is_boolean() && val
->type
->is_scalar())
898 if (!*error_emitted
) {
899 YYLTYPE loc
= expr
->get_location();
900 _mesa_glsl_error(&loc
, state
, "%s of `%s' must be scalar boolean",
902 parent_expr
->operator_string(parent_expr
->oper
));
903 *error_emitted
= true;
906 return new(ctx
) ir_constant(true);
910 * If name refers to a builtin array whose maximum allowed size is less than
911 * size, report an error and return true. Otherwise return false.
914 check_builtin_array_max_size(const char *name
, unsigned size
,
915 YYLTYPE loc
, struct _mesa_glsl_parse_state
*state
)
917 if ((strcmp("gl_TexCoord", name
) == 0)
918 && (size
> state
->Const
.MaxTextureCoords
)) {
919 /* From page 54 (page 60 of the PDF) of the GLSL 1.20 spec:
921 * "The size [of gl_TexCoord] can be at most
922 * gl_MaxTextureCoords."
924 _mesa_glsl_error(&loc
, state
, "`gl_TexCoord' array size cannot "
925 "be larger than gl_MaxTextureCoords (%u)\n",
926 state
->Const
.MaxTextureCoords
);
928 } else if (strcmp("gl_ClipDistance", name
) == 0
929 && size
> state
->Const
.MaxClipPlanes
) {
930 /* From section 7.1 (Vertex Shader Special Variables) of the
933 * "The gl_ClipDistance array is predeclared as unsized and
934 * must be sized by the shader either redeclaring it with a
935 * size or indexing it only with integral constant
936 * expressions. ... The size can be at most
937 * gl_MaxClipDistances."
939 _mesa_glsl_error(&loc
, state
, "`gl_ClipDistance' array size cannot "
940 "be larger than gl_MaxClipDistances (%u)\n",
941 state
->Const
.MaxClipPlanes
);
948 * Create the constant 1, of a which is appropriate for incrementing and
949 * decrementing values of the given GLSL type. For example, if type is vec4,
950 * this creates a constant value of 1.0 having type float.
952 * If the given type is invalid for increment and decrement operators, return
953 * a floating point 1--the error will be detected later.
956 constant_one_for_inc_dec(void *ctx
, const glsl_type
*type
)
958 switch (type
->base_type
) {
960 return new(ctx
) ir_constant((unsigned) 1);
962 return new(ctx
) ir_constant(1);
964 case GLSL_TYPE_FLOAT
:
965 return new(ctx
) ir_constant(1.0f
);
970 ast_expression::hir(exec_list
*instructions
,
971 struct _mesa_glsl_parse_state
*state
)
974 static const int operations
[AST_NUM_OPERATORS
] = {
975 -1, /* ast_assign doesn't convert to ir_expression. */
976 -1, /* ast_plus doesn't convert to ir_expression. */
1000 /* Note: The following block of expression types actually convert
1001 * to multiple IR instructions.
1003 ir_binop_mul
, /* ast_mul_assign */
1004 ir_binop_div
, /* ast_div_assign */
1005 ir_binop_mod
, /* ast_mod_assign */
1006 ir_binop_add
, /* ast_add_assign */
1007 ir_binop_sub
, /* ast_sub_assign */
1008 ir_binop_lshift
, /* ast_ls_assign */
1009 ir_binop_rshift
, /* ast_rs_assign */
1010 ir_binop_bit_and
, /* ast_and_assign */
1011 ir_binop_bit_xor
, /* ast_xor_assign */
1012 ir_binop_bit_or
, /* ast_or_assign */
1014 -1, /* ast_conditional doesn't convert to ir_expression. */
1015 ir_binop_add
, /* ast_pre_inc. */
1016 ir_binop_sub
, /* ast_pre_dec. */
1017 ir_binop_add
, /* ast_post_inc. */
1018 ir_binop_sub
, /* ast_post_dec. */
1019 -1, /* ast_field_selection doesn't conv to ir_expression. */
1020 -1, /* ast_array_index doesn't convert to ir_expression. */
1021 -1, /* ast_function_call doesn't conv to ir_expression. */
1022 -1, /* ast_identifier doesn't convert to ir_expression. */
1023 -1, /* ast_int_constant doesn't convert to ir_expression. */
1024 -1, /* ast_uint_constant doesn't conv to ir_expression. */
1025 -1, /* ast_float_constant doesn't conv to ir_expression. */
1026 -1, /* ast_bool_constant doesn't conv to ir_expression. */
1027 -1, /* ast_sequence doesn't convert to ir_expression. */
1029 ir_rvalue
*result
= NULL
;
1031 const struct glsl_type
*type
; /* a temporary variable for switch cases */
1032 bool error_emitted
= false;
1035 loc
= this->get_location();
1037 switch (this->oper
) {
1039 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1040 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1042 result
= do_assignment(instructions
, state
,
1043 this->subexpressions
[0]->non_lvalue_description
,
1044 op
[0], op
[1], false,
1045 this->subexpressions
[0]->get_location());
1046 error_emitted
= result
->type
->is_error();
1051 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1053 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1055 error_emitted
= type
->is_error();
1061 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1063 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1065 error_emitted
= type
->is_error();
1067 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1075 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1076 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1078 type
= arithmetic_result_type(op
[0], op
[1],
1079 (this->oper
== ast_mul
),
1081 error_emitted
= type
->is_error();
1083 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1088 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1089 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1091 type
= modulus_result_type(op
[0]->type
, op
[1]->type
, state
, & loc
);
1093 assert(operations
[this->oper
] == ir_binop_mod
);
1095 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1097 error_emitted
= type
->is_error();
1102 if (state
->language_version
< 130) {
1103 _mesa_glsl_error(&loc
, state
, "operator %s requires GLSL 1.30",
1104 operator_string(this->oper
));
1105 error_emitted
= true;
1108 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1109 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1110 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1112 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1114 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1121 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1122 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1124 type
= relational_result_type(op
[0], op
[1], state
, & loc
);
1126 /* The relational operators must either generate an error or result
1127 * in a scalar boolean. See page 57 of the GLSL 1.50 spec.
1129 assert(type
->is_error()
1130 || ((type
->base_type
== GLSL_TYPE_BOOL
)
1131 && type
->is_scalar()));
1133 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1135 error_emitted
= type
->is_error();
1140 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1141 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1143 /* From page 58 (page 64 of the PDF) of the GLSL 1.50 spec:
1145 * "The equality operators equal (==), and not equal (!=)
1146 * operate on all types. They result in a scalar Boolean. If
1147 * the operand types do not match, then there must be a
1148 * conversion from Section 4.1.10 "Implicit Conversions"
1149 * applied to one operand that can make them match, in which
1150 * case this conversion is done."
1152 if ((!apply_implicit_conversion(op
[0]->type
, op
[1], state
)
1153 && !apply_implicit_conversion(op
[1]->type
, op
[0], state
))
1154 || (op
[0]->type
!= op
[1]->type
)) {
1155 _mesa_glsl_error(& loc
, state
, "operands of `%s' must have the same "
1156 "type", (this->oper
== ast_equal
) ? "==" : "!=");
1157 error_emitted
= true;
1158 } else if ((state
->language_version
<= 110)
1159 && (op
[0]->type
->is_array() || op
[1]->type
->is_array())) {
1160 _mesa_glsl_error(& loc
, state
, "array comparisons forbidden in "
1162 error_emitted
= true;
1165 if (error_emitted
) {
1166 result
= new(ctx
) ir_constant(false);
1168 result
= do_comparison(ctx
, operations
[this->oper
], op
[0], op
[1]);
1169 assert(result
->type
== glsl_type::bool_type
);
1176 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1177 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1178 type
= bit_logic_result_type(op
[0]->type
, op
[1]->type
, this->oper
,
1180 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1182 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1186 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1188 if (state
->language_version
< 130) {
1189 _mesa_glsl_error(&loc
, state
, "bit-wise operations require GLSL 1.30");
1190 error_emitted
= true;
1193 if (!op
[0]->type
->is_integer()) {
1194 _mesa_glsl_error(&loc
, state
, "operand of `~' must be an integer");
1195 error_emitted
= true;
1198 type
= error_emitted
? glsl_type::error_type
: op
[0]->type
;
1199 result
= new(ctx
) ir_expression(ir_unop_bit_not
, type
, op
[0], NULL
);
1202 case ast_logic_and
: {
1203 exec_list rhs_instructions
;
1204 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1205 "LHS", &error_emitted
);
1206 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1207 "RHS", &error_emitted
);
1209 if (rhs_instructions
.is_empty()) {
1210 result
= new(ctx
) ir_expression(ir_binop_logic_and
, op
[0], op
[1]);
1211 type
= result
->type
;
1213 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1216 instructions
->push_tail(tmp
);
1218 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1219 instructions
->push_tail(stmt
);
1221 stmt
->then_instructions
.append_list(&rhs_instructions
);
1222 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1223 ir_assignment
*const then_assign
=
1224 new(ctx
) ir_assignment(then_deref
, op
[1]);
1225 stmt
->then_instructions
.push_tail(then_assign
);
1227 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1228 ir_assignment
*const else_assign
=
1229 new(ctx
) ir_assignment(else_deref
, new(ctx
) ir_constant(false));
1230 stmt
->else_instructions
.push_tail(else_assign
);
1232 result
= new(ctx
) ir_dereference_variable(tmp
);
1238 case ast_logic_or
: {
1239 exec_list rhs_instructions
;
1240 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1241 "LHS", &error_emitted
);
1242 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1243 "RHS", &error_emitted
);
1245 if (rhs_instructions
.is_empty()) {
1246 result
= new(ctx
) ir_expression(ir_binop_logic_or
, op
[0], op
[1]);
1247 type
= result
->type
;
1249 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1252 instructions
->push_tail(tmp
);
1254 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1255 instructions
->push_tail(stmt
);
1257 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1258 ir_assignment
*const then_assign
=
1259 new(ctx
) ir_assignment(then_deref
, new(ctx
) ir_constant(true));
1260 stmt
->then_instructions
.push_tail(then_assign
);
1262 stmt
->else_instructions
.append_list(&rhs_instructions
);
1263 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1264 ir_assignment
*const else_assign
=
1265 new(ctx
) ir_assignment(else_deref
, op
[1]);
1266 stmt
->else_instructions
.push_tail(else_assign
);
1268 result
= new(ctx
) ir_dereference_variable(tmp
);
1275 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1277 * "The logical binary operators and (&&), or ( | | ), and
1278 * exclusive or (^^). They operate only on two Boolean
1279 * expressions and result in a Boolean expression."
1281 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0, "LHS",
1283 op
[1] = get_scalar_boolean_operand(instructions
, state
, this, 1, "RHS",
1286 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1291 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1292 "operand", &error_emitted
);
1294 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1298 case ast_mul_assign
:
1299 case ast_div_assign
:
1300 case ast_add_assign
:
1301 case ast_sub_assign
: {
1302 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1303 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1305 type
= arithmetic_result_type(op
[0], op
[1],
1306 (this->oper
== ast_mul_assign
),
1309 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1312 result
= do_assignment(instructions
, state
,
1313 this->subexpressions
[0]->non_lvalue_description
,
1314 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1315 this->subexpressions
[0]->get_location());
1316 error_emitted
= (op
[0]->type
->is_error());
1318 /* GLSL 1.10 does not allow array assignment. However, we don't have to
1319 * explicitly test for this because none of the binary expression
1320 * operators allow array operands either.
1326 case ast_mod_assign
: {
1327 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1328 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1330 type
= modulus_result_type(op
[0]->type
, op
[1]->type
, state
, & loc
);
1332 assert(operations
[this->oper
] == ir_binop_mod
);
1334 ir_rvalue
*temp_rhs
;
1335 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1338 result
= do_assignment(instructions
, state
,
1339 this->subexpressions
[0]->non_lvalue_description
,
1340 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1341 this->subexpressions
[0]->get_location());
1342 error_emitted
= type
->is_error();
1347 case ast_rs_assign
: {
1348 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1349 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1350 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1352 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1353 type
, op
[0], op
[1]);
1354 result
= do_assignment(instructions
, state
,
1355 this->subexpressions
[0]->non_lvalue_description
,
1356 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1357 this->subexpressions
[0]->get_location());
1358 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1362 case ast_and_assign
:
1363 case ast_xor_assign
:
1364 case ast_or_assign
: {
1365 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1366 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1367 type
= bit_logic_result_type(op
[0]->type
, op
[1]->type
, this->oper
,
1369 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1370 type
, op
[0], op
[1]);
1371 result
= do_assignment(instructions
, state
,
1372 this->subexpressions
[0]->non_lvalue_description
,
1373 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1374 this->subexpressions
[0]->get_location());
1375 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1379 case ast_conditional
: {
1380 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1382 * "The ternary selection operator (?:). It operates on three
1383 * expressions (exp1 ? exp2 : exp3). This operator evaluates the
1384 * first expression, which must result in a scalar Boolean."
1386 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1387 "condition", &error_emitted
);
1389 /* The :? operator is implemented by generating an anonymous temporary
1390 * followed by an if-statement. The last instruction in each branch of
1391 * the if-statement assigns a value to the anonymous temporary. This
1392 * temporary is the r-value of the expression.
1394 exec_list then_instructions
;
1395 exec_list else_instructions
;
1397 op
[1] = this->subexpressions
[1]->hir(&then_instructions
, state
);
1398 op
[2] = this->subexpressions
[2]->hir(&else_instructions
, state
);
1400 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1402 * "The second and third expressions can be any type, as
1403 * long their types match, or there is a conversion in
1404 * Section 4.1.10 "Implicit Conversions" that can be applied
1405 * to one of the expressions to make their types match. This
1406 * resulting matching type is the type of the entire
1409 if ((!apply_implicit_conversion(op
[1]->type
, op
[2], state
)
1410 && !apply_implicit_conversion(op
[2]->type
, op
[1], state
))
1411 || (op
[1]->type
!= op
[2]->type
)) {
1412 YYLTYPE loc
= this->subexpressions
[1]->get_location();
1414 _mesa_glsl_error(& loc
, state
, "Second and third operands of ?: "
1415 "operator must have matching types.");
1416 error_emitted
= true;
1417 type
= glsl_type::error_type
;
1422 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1424 * "The second and third expressions must be the same type, but can
1425 * be of any type other than an array."
1427 if ((state
->language_version
<= 110) && type
->is_array()) {
1428 _mesa_glsl_error(& loc
, state
, "Second and third operands of ?: "
1429 "operator must not be arrays.");
1430 error_emitted
= true;
1433 ir_constant
*cond_val
= op
[0]->constant_expression_value();
1434 ir_constant
*then_val
= op
[1]->constant_expression_value();
1435 ir_constant
*else_val
= op
[2]->constant_expression_value();
1437 if (then_instructions
.is_empty()
1438 && else_instructions
.is_empty()
1439 && (cond_val
!= NULL
) && (then_val
!= NULL
) && (else_val
!= NULL
)) {
1440 result
= (cond_val
->value
.b
[0]) ? then_val
: else_val
;
1442 ir_variable
*const tmp
=
1443 new(ctx
) ir_variable(type
, "conditional_tmp", ir_var_temporary
);
1444 instructions
->push_tail(tmp
);
1446 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1447 instructions
->push_tail(stmt
);
1449 then_instructions
.move_nodes_to(& stmt
->then_instructions
);
1450 ir_dereference
*const then_deref
=
1451 new(ctx
) ir_dereference_variable(tmp
);
1452 ir_assignment
*const then_assign
=
1453 new(ctx
) ir_assignment(then_deref
, op
[1]);
1454 stmt
->then_instructions
.push_tail(then_assign
);
1456 else_instructions
.move_nodes_to(& stmt
->else_instructions
);
1457 ir_dereference
*const else_deref
=
1458 new(ctx
) ir_dereference_variable(tmp
);
1459 ir_assignment
*const else_assign
=
1460 new(ctx
) ir_assignment(else_deref
, op
[2]);
1461 stmt
->else_instructions
.push_tail(else_assign
);
1463 result
= new(ctx
) ir_dereference_variable(tmp
);
1470 this->non_lvalue_description
= (this->oper
== ast_pre_inc
)
1471 ? "pre-increment operation" : "pre-decrement operation";
1473 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1474 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1476 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1478 ir_rvalue
*temp_rhs
;
1479 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1482 result
= do_assignment(instructions
, state
,
1483 this->subexpressions
[0]->non_lvalue_description
,
1484 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1485 this->subexpressions
[0]->get_location());
1486 error_emitted
= op
[0]->type
->is_error();
1491 case ast_post_dec
: {
1492 this->non_lvalue_description
= (this->oper
== ast_post_inc
)
1493 ? "post-increment operation" : "post-decrement operation";
1494 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1495 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1497 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1499 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1501 ir_rvalue
*temp_rhs
;
1502 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1505 /* Get a temporary of a copy of the lvalue before it's modified.
1506 * This may get thrown away later.
1508 result
= get_lvalue_copy(instructions
, op
[0]->clone(ctx
, NULL
));
1510 (void)do_assignment(instructions
, state
,
1511 this->subexpressions
[0]->non_lvalue_description
,
1512 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1513 this->subexpressions
[0]->get_location());
1515 error_emitted
= op
[0]->type
->is_error();
1519 case ast_field_selection
:
1520 result
= _mesa_ast_field_selection_to_hir(this, instructions
, state
);
1523 case ast_array_index
: {
1524 YYLTYPE index_loc
= subexpressions
[1]->get_location();
1526 op
[0] = subexpressions
[0]->hir(instructions
, state
);
1527 op
[1] = subexpressions
[1]->hir(instructions
, state
);
1529 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1531 ir_rvalue
*const array
= op
[0];
1533 result
= new(ctx
) ir_dereference_array(op
[0], op
[1]);
1535 /* Do not use op[0] after this point. Use array.
1543 if (!array
->type
->is_array()
1544 && !array
->type
->is_matrix()
1545 && !array
->type
->is_vector()) {
1546 _mesa_glsl_error(& index_loc
, state
,
1547 "cannot dereference non-array / non-matrix / "
1549 error_emitted
= true;
1552 if (!op
[1]->type
->is_integer()) {
1553 _mesa_glsl_error(& index_loc
, state
,
1554 "array index must be integer type");
1555 error_emitted
= true;
1556 } else if (!op
[1]->type
->is_scalar()) {
1557 _mesa_glsl_error(& index_loc
, state
,
1558 "array index must be scalar");
1559 error_emitted
= true;
1562 /* If the array index is a constant expression and the array has a
1563 * declared size, ensure that the access is in-bounds. If the array
1564 * index is not a constant expression, ensure that the array has a
1567 ir_constant
*const const_index
= op
[1]->constant_expression_value();
1568 if (const_index
!= NULL
) {
1569 const int idx
= const_index
->value
.i
[0];
1570 const char *type_name
;
1573 if (array
->type
->is_matrix()) {
1574 type_name
= "matrix";
1575 } else if (array
->type
->is_vector()) {
1576 type_name
= "vector";
1578 type_name
= "array";
1581 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec:
1583 * "It is illegal to declare an array with a size, and then
1584 * later (in the same shader) index the same array with an
1585 * integral constant expression greater than or equal to the
1586 * declared size. It is also illegal to index an array with a
1587 * negative constant expression."
1589 if (array
->type
->is_matrix()) {
1590 if (array
->type
->row_type()->vector_elements
<= idx
) {
1591 bound
= array
->type
->row_type()->vector_elements
;
1593 } else if (array
->type
->is_vector()) {
1594 if (array
->type
->vector_elements
<= idx
) {
1595 bound
= array
->type
->vector_elements
;
1598 if ((array
->type
->array_size() > 0)
1599 && (array
->type
->array_size() <= idx
)) {
1600 bound
= array
->type
->array_size();
1605 _mesa_glsl_error(& loc
, state
, "%s index must be < %u",
1607 error_emitted
= true;
1608 } else if (idx
< 0) {
1609 _mesa_glsl_error(& loc
, state
, "%s index must be >= 0",
1611 error_emitted
= true;
1614 if (array
->type
->is_array()) {
1615 /* If the array is a variable dereference, it dereferences the
1616 * whole array, by definition. Use this to get the variable.
1618 * FINISHME: Should some methods for getting / setting / testing
1619 * FINISHME: array access limits be added to ir_dereference?
1621 ir_variable
*const v
= array
->whole_variable_referenced();
1622 if ((v
!= NULL
) && (unsigned(idx
) > v
->max_array_access
)) {
1623 v
->max_array_access
= idx
;
1625 /* Check whether this access will, as a side effect, implicitly
1626 * cause the size of a built-in array to be too large.
1628 if (check_builtin_array_max_size(v
->name
, idx
+1, loc
, state
))
1629 error_emitted
= true;
1632 } else if (array
->type
->array_size() == 0) {
1633 _mesa_glsl_error(&loc
, state
, "unsized array index must be constant");
1635 if (array
->type
->is_array()) {
1636 /* whole_variable_referenced can return NULL if the array is a
1637 * member of a structure. In this case it is safe to not update
1638 * the max_array_access field because it is never used for fields
1641 ir_variable
*v
= array
->whole_variable_referenced();
1643 v
->max_array_access
= array
->type
->array_size() - 1;
1647 /* From page 23 (29 of the PDF) of the GLSL 1.30 spec:
1649 * "Samplers aggregated into arrays within a shader (using square
1650 * brackets [ ]) can only be indexed with integral constant
1651 * expressions [...]."
1653 * This restriction was added in GLSL 1.30. Shaders using earlier version
1654 * of the language should not be rejected by the compiler front-end for
1655 * using this construct. This allows useful things such as using a loop
1656 * counter as the index to an array of samplers. If the loop in unrolled,
1657 * the code should compile correctly. Instead, emit a warning.
1659 if (array
->type
->is_array() &&
1660 array
->type
->element_type()->is_sampler() &&
1661 const_index
== NULL
) {
1663 if (state
->language_version
== 100) {
1664 _mesa_glsl_warning(&loc
, state
,
1665 "sampler arrays indexed with non-constant "
1666 "expressions is optional in GLSL ES 1.00");
1667 } else if (state
->language_version
< 130) {
1668 _mesa_glsl_warning(&loc
, state
,
1669 "sampler arrays indexed with non-constant "
1670 "expressions is forbidden in GLSL 1.30 and "
1673 _mesa_glsl_error(&loc
, state
,
1674 "sampler arrays indexed with non-constant "
1675 "expressions is forbidden in GLSL 1.30 and "
1677 error_emitted
= true;
1682 result
->type
= glsl_type::error_type
;
1687 case ast_function_call
:
1688 /* Should *NEVER* get here. ast_function_call should always be handled
1689 * by ast_function_expression::hir.
1694 case ast_identifier
: {
1695 /* ast_identifier can appear several places in a full abstract syntax
1696 * tree. This particular use must be at location specified in the grammar
1697 * as 'variable_identifier'.
1700 state
->symbols
->get_variable(this->primary_expression
.identifier
);
1704 result
= new(ctx
) ir_dereference_variable(var
);
1706 _mesa_glsl_error(& loc
, state
, "`%s' undeclared",
1707 this->primary_expression
.identifier
);
1709 result
= ir_rvalue::error_value(ctx
);
1710 error_emitted
= true;
1715 case ast_int_constant
:
1716 result
= new(ctx
) ir_constant(this->primary_expression
.int_constant
);
1719 case ast_uint_constant
:
1720 result
= new(ctx
) ir_constant(this->primary_expression
.uint_constant
);
1723 case ast_float_constant
:
1724 result
= new(ctx
) ir_constant(this->primary_expression
.float_constant
);
1727 case ast_bool_constant
:
1728 result
= new(ctx
) ir_constant(bool(this->primary_expression
.bool_constant
));
1731 case ast_sequence
: {
1732 /* It should not be possible to generate a sequence in the AST without
1733 * any expressions in it.
1735 assert(!this->expressions
.is_empty());
1737 /* The r-value of a sequence is the last expression in the sequence. If
1738 * the other expressions in the sequence do not have side-effects (and
1739 * therefore add instructions to the instruction list), they get dropped
1742 exec_node
*previous_tail_pred
= NULL
;
1743 YYLTYPE previous_operand_loc
= loc
;
1745 foreach_list_typed (ast_node
, ast
, link
, &this->expressions
) {
1746 /* If one of the operands of comma operator does not generate any
1747 * code, we want to emit a warning. At each pass through the loop
1748 * previous_tail_pred will point to the last instruction in the
1749 * stream *before* processing the previous operand. Naturally,
1750 * instructions->tail_pred will point to the last instruction in the
1751 * stream *after* processing the previous operand. If the two
1752 * pointers match, then the previous operand had no effect.
1754 * The warning behavior here differs slightly from GCC. GCC will
1755 * only emit a warning if none of the left-hand operands have an
1756 * effect. However, it will emit a warning for each. I believe that
1757 * there are some cases in C (especially with GCC extensions) where
1758 * it is useful to have an intermediate step in a sequence have no
1759 * effect, but I don't think these cases exist in GLSL. Either way,
1760 * it would be a giant hassle to replicate that behavior.
1762 if (previous_tail_pred
== instructions
->tail_pred
) {
1763 _mesa_glsl_warning(&previous_operand_loc
, state
,
1764 "left-hand operand of comma expression has "
1768 /* tail_pred is directly accessed instead of using the get_tail()
1769 * method for performance reasons. get_tail() has extra code to
1770 * return NULL when the list is empty. We don't care about that
1771 * here, so using tail_pred directly is fine.
1773 previous_tail_pred
= instructions
->tail_pred
;
1774 previous_operand_loc
= ast
->get_location();
1776 result
= ast
->hir(instructions
, state
);
1779 /* Any errors should have already been emitted in the loop above.
1781 error_emitted
= true;
1785 type
= NULL
; /* use result->type, not type. */
1786 assert(result
!= NULL
);
1788 if (result
->type
->is_error() && !error_emitted
)
1789 _mesa_glsl_error(& loc
, state
, "type mismatch");
1796 ast_expression_statement::hir(exec_list
*instructions
,
1797 struct _mesa_glsl_parse_state
*state
)
1799 /* It is possible to have expression statements that don't have an
1800 * expression. This is the solitary semicolon:
1802 * for (i = 0; i < 5; i++)
1805 * In this case the expression will be NULL. Test for NULL and don't do
1806 * anything in that case.
1808 if (expression
!= NULL
)
1809 expression
->hir(instructions
, state
);
1811 /* Statements do not have r-values.
1818 ast_compound_statement::hir(exec_list
*instructions
,
1819 struct _mesa_glsl_parse_state
*state
)
1822 state
->symbols
->push_scope();
1824 foreach_list_typed (ast_node
, ast
, link
, &this->statements
)
1825 ast
->hir(instructions
, state
);
1828 state
->symbols
->pop_scope();
1830 /* Compound statements do not have r-values.
1836 static const glsl_type
*
1837 process_array_type(YYLTYPE
*loc
, const glsl_type
*base
, ast_node
*array_size
,
1838 struct _mesa_glsl_parse_state
*state
)
1840 unsigned length
= 0;
1842 /* From page 19 (page 25) of the GLSL 1.20 spec:
1844 * "Only one-dimensional arrays may be declared."
1846 if (base
->is_array()) {
1847 _mesa_glsl_error(loc
, state
,
1848 "invalid array of `%s' (only one-dimensional arrays "
1851 return glsl_type::error_type
;
1854 if (array_size
!= NULL
) {
1855 exec_list dummy_instructions
;
1856 ir_rvalue
*const ir
= array_size
->hir(& dummy_instructions
, state
);
1857 YYLTYPE loc
= array_size
->get_location();
1860 if (!ir
->type
->is_integer()) {
1861 _mesa_glsl_error(& loc
, state
, "array size must be integer type");
1862 } else if (!ir
->type
->is_scalar()) {
1863 _mesa_glsl_error(& loc
, state
, "array size must be scalar type");
1865 ir_constant
*const size
= ir
->constant_expression_value();
1868 _mesa_glsl_error(& loc
, state
, "array size must be a "
1869 "constant valued expression");
1870 } else if (size
->value
.i
[0] <= 0) {
1871 _mesa_glsl_error(& loc
, state
, "array size must be > 0");
1873 assert(size
->type
== ir
->type
);
1874 length
= size
->value
.u
[0];
1876 /* If the array size is const (and we've verified that
1877 * it is) then no instructions should have been emitted
1878 * when we converted it to HIR. If they were emitted,
1879 * then either the array size isn't const after all, or
1880 * we are emitting unnecessary instructions.
1882 assert(dummy_instructions
.is_empty());
1886 } else if (state
->es_shader
) {
1887 /* Section 10.17 of the GLSL ES 1.00 specification states that unsized
1888 * array declarations have been removed from the language.
1890 _mesa_glsl_error(loc
, state
, "unsized array declarations are not "
1891 "allowed in GLSL ES 1.00.");
1894 return glsl_type::get_array_instance(base
, length
);
1899 ast_type_specifier::glsl_type(const char **name
,
1900 struct _mesa_glsl_parse_state
*state
) const
1902 const struct glsl_type
*type
;
1904 type
= state
->symbols
->get_type(this->type_name
);
1905 *name
= this->type_name
;
1907 if (this->is_array
) {
1908 YYLTYPE loc
= this->get_location();
1909 type
= process_array_type(&loc
, type
, this->array_size
, state
);
1917 apply_type_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
1919 struct _mesa_glsl_parse_state
*state
,
1922 if (qual
->flags
.q
.invariant
) {
1924 _mesa_glsl_error(loc
, state
,
1925 "variable `%s' may not be redeclared "
1926 "`invariant' after being used",
1933 if (qual
->flags
.q
.constant
|| qual
->flags
.q
.attribute
1934 || qual
->flags
.q
.uniform
1935 || (qual
->flags
.q
.varying
&& (state
->target
== fragment_shader
)))
1938 if (qual
->flags
.q
.centroid
)
1941 if (qual
->flags
.q
.attribute
&& state
->target
!= vertex_shader
) {
1942 var
->type
= glsl_type::error_type
;
1943 _mesa_glsl_error(loc
, state
,
1944 "`attribute' variables may not be declared in the "
1946 _mesa_glsl_shader_target_name(state
->target
));
1949 /* From page 25 (page 31 of the PDF) of the GLSL 1.10 spec:
1951 * "The varying qualifier can be used only with the data types
1952 * float, vec2, vec3, vec4, mat2, mat3, and mat4, or arrays of
1955 if (qual
->flags
.q
.varying
) {
1956 const glsl_type
*non_array_type
;
1958 if (var
->type
&& var
->type
->is_array())
1959 non_array_type
= var
->type
->fields
.array
;
1961 non_array_type
= var
->type
;
1963 if (non_array_type
&& non_array_type
->base_type
!= GLSL_TYPE_FLOAT
) {
1964 var
->type
= glsl_type::error_type
;
1965 _mesa_glsl_error(loc
, state
,
1966 "varying variables must be of base type float");
1970 /* If there is no qualifier that changes the mode of the variable, leave
1971 * the setting alone.
1973 if (qual
->flags
.q
.in
&& qual
->flags
.q
.out
)
1974 var
->mode
= ir_var_inout
;
1975 else if (qual
->flags
.q
.attribute
|| qual
->flags
.q
.in
1976 || (qual
->flags
.q
.varying
&& (state
->target
== fragment_shader
)))
1977 var
->mode
= ir_var_in
;
1978 else if (qual
->flags
.q
.out
1979 || (qual
->flags
.q
.varying
&& (state
->target
== vertex_shader
)))
1980 var
->mode
= ir_var_out
;
1981 else if (qual
->flags
.q
.uniform
)
1982 var
->mode
= ir_var_uniform
;
1984 if (state
->all_invariant
&& (state
->current_function
== NULL
)) {
1985 switch (state
->target
) {
1987 if (var
->mode
== ir_var_out
)
1988 var
->invariant
= true;
1990 case geometry_shader
:
1991 if ((var
->mode
== ir_var_in
) || (var
->mode
== ir_var_out
))
1992 var
->invariant
= true;
1994 case fragment_shader
:
1995 if (var
->mode
== ir_var_in
)
1996 var
->invariant
= true;
2001 if (qual
->flags
.q
.flat
)
2002 var
->interpolation
= INTERP_QUALIFIER_FLAT
;
2003 else if (qual
->flags
.q
.noperspective
)
2004 var
->interpolation
= INTERP_QUALIFIER_NOPERSPECTIVE
;
2005 else if (qual
->flags
.q
.smooth
)
2006 var
->interpolation
= INTERP_QUALIFIER_SMOOTH
;
2008 var
->interpolation
= INTERP_QUALIFIER_NONE
;
2010 if (var
->interpolation
!= INTERP_QUALIFIER_NONE
&&
2011 !(state
->target
== vertex_shader
&& var
->mode
== ir_var_out
) &&
2012 !(state
->target
== fragment_shader
&& var
->mode
== ir_var_in
)) {
2013 _mesa_glsl_error(loc
, state
,
2014 "interpolation qualifier `%s' can only be applied to "
2015 "vertex shader outputs and fragment shader inputs.",
2016 var
->interpolation_string());
2019 var
->pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
2020 var
->origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
2021 if ((qual
->flags
.q
.origin_upper_left
|| qual
->flags
.q
.pixel_center_integer
)
2022 && (strcmp(var
->name
, "gl_FragCoord") != 0)) {
2023 const char *const qual_string
= (qual
->flags
.q
.origin_upper_left
)
2024 ? "origin_upper_left" : "pixel_center_integer";
2026 _mesa_glsl_error(loc
, state
,
2027 "layout qualifier `%s' can only be applied to "
2028 "fragment shader input `gl_FragCoord'",
2032 if (qual
->flags
.q
.explicit_location
) {
2033 const bool global_scope
= (state
->current_function
== NULL
);
2035 const char *string
= "";
2037 /* In the vertex shader only shader inputs can be given explicit
2040 * In the fragment shader only shader outputs can be given explicit
2043 switch (state
->target
) {
2045 if (!global_scope
|| (var
->mode
!= ir_var_in
)) {
2051 case geometry_shader
:
2052 _mesa_glsl_error(loc
, state
,
2053 "geometry shader variables cannot be given "
2054 "explicit locations\n");
2057 case fragment_shader
:
2058 if (!global_scope
|| (var
->mode
!= ir_var_out
)) {
2066 _mesa_glsl_error(loc
, state
,
2067 "only %s shader %s variables can be given an "
2068 "explicit location\n",
2069 _mesa_glsl_shader_target_name(state
->target
),
2072 var
->explicit_location
= true;
2074 /* This bit of silliness is needed because invalid explicit locations
2075 * are supposed to be flagged during linking. Small negative values
2076 * biased by VERT_ATTRIB_GENERIC0 or FRAG_RESULT_DATA0 could alias
2077 * built-in values (e.g., -16+VERT_ATTRIB_GENERIC0 = VERT_ATTRIB_POS).
2078 * The linker needs to be able to differentiate these cases. This
2079 * ensures that negative values stay negative.
2081 if (qual
->location
>= 0) {
2082 var
->location
= (state
->target
== vertex_shader
)
2083 ? (qual
->location
+ VERT_ATTRIB_GENERIC0
)
2084 : (qual
->location
+ FRAG_RESULT_DATA0
);
2086 var
->location
= qual
->location
;
2088 if (qual
->flags
.q
.explicit_index
) {
2089 var
->explicit_index
= true;
2090 var
->index
= qual
->index
;
2093 } else if (qual
->flags
.q
.explicit_index
) {
2094 _mesa_glsl_error(loc
, state
,
2095 "explicit index requires explicit location\n");
2098 /* Does the declaration use the 'layout' keyword?
2100 const bool uses_layout
= qual
->flags
.q
.pixel_center_integer
2101 || qual
->flags
.q
.origin_upper_left
2102 || qual
->flags
.q
.explicit_location
; /* no need for index since it relies on location */
2104 /* Does the declaration use the deprecated 'attribute' or 'varying'
2107 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
2108 || qual
->flags
.q
.varying
;
2110 /* Is the 'layout' keyword used with parameters that allow relaxed checking.
2111 * Many implementations of GL_ARB_fragment_coord_conventions_enable and some
2112 * implementations (only Mesa?) GL_ARB_explicit_attrib_location_enable
2113 * allowed the layout qualifier to be used with 'varying' and 'attribute'.
2114 * These extensions and all following extensions that add the 'layout'
2115 * keyword have been modified to require the use of 'in' or 'out'.
2117 * The following extension do not allow the deprecated keywords:
2119 * GL_AMD_conservative_depth
2120 * GL_ARB_conservative_depth
2121 * GL_ARB_gpu_shader5
2122 * GL_ARB_separate_shader_objects
2123 * GL_ARB_tesselation_shader
2124 * GL_ARB_transform_feedback3
2125 * GL_ARB_uniform_buffer_object
2127 * It is unknown whether GL_EXT_shader_image_load_store or GL_NV_gpu_shader5
2128 * allow layout with the deprecated keywords.
2130 const bool relaxed_layout_qualifier_checking
=
2131 state
->ARB_fragment_coord_conventions_enable
;
2133 if (uses_layout
&& uses_deprecated_qualifier
) {
2134 if (relaxed_layout_qualifier_checking
) {
2135 _mesa_glsl_warning(loc
, state
,
2136 "`layout' qualifier may not be used with "
2137 "`attribute' or `varying'");
2139 _mesa_glsl_error(loc
, state
,
2140 "`layout' qualifier may not be used with "
2141 "`attribute' or `varying'");
2145 /* Layout qualifiers for gl_FragDepth, which are enabled by extension
2146 * AMD_conservative_depth.
2148 int depth_layout_count
= qual
->flags
.q
.depth_any
2149 + qual
->flags
.q
.depth_greater
2150 + qual
->flags
.q
.depth_less
2151 + qual
->flags
.q
.depth_unchanged
;
2152 if (depth_layout_count
> 0
2153 && !state
->AMD_conservative_depth_enable
2154 && !state
->ARB_conservative_depth_enable
) {
2155 _mesa_glsl_error(loc
, state
,
2156 "extension GL_AMD_conservative_depth or "
2157 "GL_ARB_conservative_depth must be enabled "
2158 "to use depth layout qualifiers");
2159 } else if (depth_layout_count
> 0
2160 && strcmp(var
->name
, "gl_FragDepth") != 0) {
2161 _mesa_glsl_error(loc
, state
,
2162 "depth layout qualifiers can be applied only to "
2164 } else if (depth_layout_count
> 1
2165 && strcmp(var
->name
, "gl_FragDepth") == 0) {
2166 _mesa_glsl_error(loc
, state
,
2167 "at most one depth layout qualifier can be applied to "
2170 if (qual
->flags
.q
.depth_any
)
2171 var
->depth_layout
= ir_depth_layout_any
;
2172 else if (qual
->flags
.q
.depth_greater
)
2173 var
->depth_layout
= ir_depth_layout_greater
;
2174 else if (qual
->flags
.q
.depth_less
)
2175 var
->depth_layout
= ir_depth_layout_less
;
2176 else if (qual
->flags
.q
.depth_unchanged
)
2177 var
->depth_layout
= ir_depth_layout_unchanged
;
2179 var
->depth_layout
= ir_depth_layout_none
;
2183 * Get the variable that is being redeclared by this declaration
2185 * Semantic checks to verify the validity of the redeclaration are also
2186 * performed. If semantic checks fail, compilation error will be emitted via
2187 * \c _mesa_glsl_error, but a non-\c NULL pointer will still be returned.
2190 * A pointer to an existing variable in the current scope if the declaration
2191 * is a redeclaration, \c NULL otherwise.
2194 get_variable_being_redeclared(ir_variable
*var
, ast_declaration
*decl
,
2195 struct _mesa_glsl_parse_state
*state
)
2197 /* Check if this declaration is actually a re-declaration, either to
2198 * resize an array or add qualifiers to an existing variable.
2200 * This is allowed for variables in the current scope, or when at
2201 * global scope (for built-ins in the implicit outer scope).
2203 ir_variable
*earlier
= state
->symbols
->get_variable(decl
->identifier
);
2204 if (earlier
== NULL
||
2205 (state
->current_function
!= NULL
&&
2206 !state
->symbols
->name_declared_this_scope(decl
->identifier
))) {
2211 YYLTYPE loc
= decl
->get_location();
2213 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec,
2215 * "It is legal to declare an array without a size and then
2216 * later re-declare the same name as an array of the same
2217 * type and specify a size."
2219 if ((earlier
->type
->array_size() == 0)
2220 && var
->type
->is_array()
2221 && (var
->type
->element_type() == earlier
->type
->element_type())) {
2222 /* FINISHME: This doesn't match the qualifiers on the two
2223 * FINISHME: declarations. It's not 100% clear whether this is
2224 * FINISHME: required or not.
2227 const unsigned size
= unsigned(var
->type
->array_size());
2228 check_builtin_array_max_size(var
->name
, size
, loc
, state
);
2229 if ((size
> 0) && (size
<= earlier
->max_array_access
)) {
2230 _mesa_glsl_error(& loc
, state
, "array size must be > %u due to "
2232 earlier
->max_array_access
);
2235 earlier
->type
= var
->type
;
2238 } else if (state
->ARB_fragment_coord_conventions_enable
2239 && strcmp(var
->name
, "gl_FragCoord") == 0
2240 && earlier
->type
== var
->type
2241 && earlier
->mode
== var
->mode
) {
2242 /* Allow redeclaration of gl_FragCoord for ARB_fcc layout
2245 earlier
->origin_upper_left
= var
->origin_upper_left
;
2246 earlier
->pixel_center_integer
= var
->pixel_center_integer
;
2248 /* According to section 4.3.7 of the GLSL 1.30 spec,
2249 * the following built-in varaibles can be redeclared with an
2250 * interpolation qualifier:
2253 * * gl_FrontSecondaryColor
2254 * * gl_BackSecondaryColor
2256 * * gl_SecondaryColor
2258 } else if (state
->language_version
>= 130
2259 && (strcmp(var
->name
, "gl_FrontColor") == 0
2260 || strcmp(var
->name
, "gl_BackColor") == 0
2261 || strcmp(var
->name
, "gl_FrontSecondaryColor") == 0
2262 || strcmp(var
->name
, "gl_BackSecondaryColor") == 0
2263 || strcmp(var
->name
, "gl_Color") == 0
2264 || strcmp(var
->name
, "gl_SecondaryColor") == 0)
2265 && earlier
->type
== var
->type
2266 && earlier
->mode
== var
->mode
) {
2267 earlier
->interpolation
= var
->interpolation
;
2269 /* Layout qualifiers for gl_FragDepth. */
2270 } else if ((state
->AMD_conservative_depth_enable
||
2271 state
->ARB_conservative_depth_enable
)
2272 && strcmp(var
->name
, "gl_FragDepth") == 0
2273 && earlier
->type
== var
->type
2274 && earlier
->mode
== var
->mode
) {
2276 /** From the AMD_conservative_depth spec:
2277 * Within any shader, the first redeclarations of gl_FragDepth
2278 * must appear before any use of gl_FragDepth.
2280 if (earlier
->used
) {
2281 _mesa_glsl_error(&loc
, state
,
2282 "the first redeclaration of gl_FragDepth "
2283 "must appear before any use of gl_FragDepth");
2286 /* Prevent inconsistent redeclaration of depth layout qualifier. */
2287 if (earlier
->depth_layout
!= ir_depth_layout_none
2288 && earlier
->depth_layout
!= var
->depth_layout
) {
2289 _mesa_glsl_error(&loc
, state
,
2290 "gl_FragDepth: depth layout is declared here "
2291 "as '%s, but it was previously declared as "
2293 depth_layout_string(var
->depth_layout
),
2294 depth_layout_string(earlier
->depth_layout
));
2297 earlier
->depth_layout
= var
->depth_layout
;
2300 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", decl
->identifier
);
2307 * Generate the IR for an initializer in a variable declaration
2310 process_initializer(ir_variable
*var
, ast_declaration
*decl
,
2311 ast_fully_specified_type
*type
,
2312 exec_list
*initializer_instructions
,
2313 struct _mesa_glsl_parse_state
*state
)
2315 ir_rvalue
*result
= NULL
;
2317 YYLTYPE initializer_loc
= decl
->initializer
->get_location();
2319 /* From page 24 (page 30 of the PDF) of the GLSL 1.10 spec:
2321 * "All uniform variables are read-only and are initialized either
2322 * directly by an application via API commands, or indirectly by
2325 if ((state
->language_version
<= 110)
2326 && (var
->mode
== ir_var_uniform
)) {
2327 _mesa_glsl_error(& initializer_loc
, state
,
2328 "cannot initialize uniforms in GLSL 1.10");
2331 if (var
->type
->is_sampler()) {
2332 _mesa_glsl_error(& initializer_loc
, state
,
2333 "cannot initialize samplers");
2336 if ((var
->mode
== ir_var_in
) && (state
->current_function
== NULL
)) {
2337 _mesa_glsl_error(& initializer_loc
, state
,
2338 "cannot initialize %s shader input / %s",
2339 _mesa_glsl_shader_target_name(state
->target
),
2340 (state
->target
== vertex_shader
)
2341 ? "attribute" : "varying");
2344 ir_dereference
*const lhs
= new(state
) ir_dereference_variable(var
);
2345 ir_rvalue
*rhs
= decl
->initializer
->hir(initializer_instructions
,
2348 /* Calculate the constant value if this is a const or uniform
2351 if (type
->qualifier
.flags
.q
.constant
2352 || type
->qualifier
.flags
.q
.uniform
) {
2353 ir_rvalue
*new_rhs
= validate_assignment(state
, var
->type
, rhs
, true);
2354 if (new_rhs
!= NULL
) {
2357 ir_constant
*constant_value
= rhs
->constant_expression_value();
2358 if (!constant_value
) {
2359 _mesa_glsl_error(& initializer_loc
, state
,
2360 "initializer of %s variable `%s' must be a "
2361 "constant expression",
2362 (type
->qualifier
.flags
.q
.constant
)
2363 ? "const" : "uniform",
2365 if (var
->type
->is_numeric()) {
2366 /* Reduce cascading errors. */
2367 var
->constant_value
= ir_constant::zero(state
, var
->type
);
2370 rhs
= constant_value
;
2371 var
->constant_value
= constant_value
;
2374 _mesa_glsl_error(&initializer_loc
, state
,
2375 "initializer of type %s cannot be assigned to "
2376 "variable of type %s",
2377 rhs
->type
->name
, var
->type
->name
);
2378 if (var
->type
->is_numeric()) {
2379 /* Reduce cascading errors. */
2380 var
->constant_value
= ir_constant::zero(state
, var
->type
);
2385 if (rhs
&& !rhs
->type
->is_error()) {
2386 bool temp
= var
->read_only
;
2387 if (type
->qualifier
.flags
.q
.constant
)
2388 var
->read_only
= false;
2390 /* Never emit code to initialize a uniform.
2392 const glsl_type
*initializer_type
;
2393 if (!type
->qualifier
.flags
.q
.uniform
) {
2394 result
= do_assignment(initializer_instructions
, state
,
2397 type
->get_location());
2398 initializer_type
= result
->type
;
2400 initializer_type
= rhs
->type
;
2402 var
->constant_initializer
= rhs
->constant_expression_value();
2403 var
->has_initializer
= true;
2405 /* If the declared variable is an unsized array, it must inherrit
2406 * its full type from the initializer. A declaration such as
2408 * uniform float a[] = float[](1.0, 2.0, 3.0, 3.0);
2412 * uniform float a[4] = float[](1.0, 2.0, 3.0, 3.0);
2414 * The assignment generated in the if-statement (below) will also
2415 * automatically handle this case for non-uniforms.
2417 * If the declared variable is not an array, the types must
2418 * already match exactly. As a result, the type assignment
2419 * here can be done unconditionally. For non-uniforms the call
2420 * to do_assignment can change the type of the initializer (via
2421 * the implicit conversion rules). For uniforms the initializer
2422 * must be a constant expression, and the type of that expression
2423 * was validated above.
2425 var
->type
= initializer_type
;
2427 var
->read_only
= temp
;
2434 ast_declarator_list::hir(exec_list
*instructions
,
2435 struct _mesa_glsl_parse_state
*state
)
2438 const struct glsl_type
*decl_type
;
2439 const char *type_name
= NULL
;
2440 ir_rvalue
*result
= NULL
;
2441 YYLTYPE loc
= this->get_location();
2443 /* From page 46 (page 52 of the PDF) of the GLSL 1.50 spec:
2445 * "To ensure that a particular output variable is invariant, it is
2446 * necessary to use the invariant qualifier. It can either be used to
2447 * qualify a previously declared variable as being invariant
2449 * invariant gl_Position; // make existing gl_Position be invariant"
2451 * In these cases the parser will set the 'invariant' flag in the declarator
2452 * list, and the type will be NULL.
2454 if (this->invariant
) {
2455 assert(this->type
== NULL
);
2457 if (state
->current_function
!= NULL
) {
2458 _mesa_glsl_error(& loc
, state
,
2459 "All uses of `invariant' keyword must be at global "
2463 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
2464 assert(!decl
->is_array
);
2465 assert(decl
->array_size
== NULL
);
2466 assert(decl
->initializer
== NULL
);
2468 ir_variable
*const earlier
=
2469 state
->symbols
->get_variable(decl
->identifier
);
2470 if (earlier
== NULL
) {
2471 _mesa_glsl_error(& loc
, state
,
2472 "Undeclared variable `%s' cannot be marked "
2473 "invariant\n", decl
->identifier
);
2474 } else if ((state
->target
== vertex_shader
)
2475 && (earlier
->mode
!= ir_var_out
)) {
2476 _mesa_glsl_error(& loc
, state
,
2477 "`%s' cannot be marked invariant, vertex shader "
2478 "outputs only\n", decl
->identifier
);
2479 } else if ((state
->target
== fragment_shader
)
2480 && (earlier
->mode
!= ir_var_in
)) {
2481 _mesa_glsl_error(& loc
, state
,
2482 "`%s' cannot be marked invariant, fragment shader "
2483 "inputs only\n", decl
->identifier
);
2484 } else if (earlier
->used
) {
2485 _mesa_glsl_error(& loc
, state
,
2486 "variable `%s' may not be redeclared "
2487 "`invariant' after being used",
2490 earlier
->invariant
= true;
2494 /* Invariant redeclarations do not have r-values.
2499 assert(this->type
!= NULL
);
2500 assert(!this->invariant
);
2502 /* The type specifier may contain a structure definition. Process that
2503 * before any of the variable declarations.
2505 (void) this->type
->specifier
->hir(instructions
, state
);
2507 decl_type
= this->type
->specifier
->glsl_type(& type_name
, state
);
2508 if (this->declarations
.is_empty()) {
2509 /* If there is no structure involved in the program text, there are two
2510 * possible scenarios:
2512 * - The program text contained something like 'vec4;'. This is an
2513 * empty declaration. It is valid but weird. Emit a warning.
2515 * - The program text contained something like 'S;' and 'S' is not the
2516 * name of a known structure type. This is both invalid and weird.
2519 * Note that if decl_type is NULL and there is a structure involved,
2520 * there must have been some sort of error with the structure. In this
2521 * case we assume that an error was already generated on this line of
2522 * code for the structure. There is no need to generate an additional,
2525 assert(this->type
->specifier
->structure
== NULL
|| decl_type
!= NULL
2527 if (this->type
->specifier
->structure
== NULL
) {
2528 if (decl_type
!= NULL
) {
2529 _mesa_glsl_warning(&loc
, state
, "empty declaration");
2531 _mesa_glsl_error(&loc
, state
,
2532 "invalid type `%s' in empty declaration",
2538 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
2539 const struct glsl_type
*var_type
;
2542 /* FINISHME: Emit a warning if a variable declaration shadows a
2543 * FINISHME: declaration at a higher scope.
2546 if ((decl_type
== NULL
) || decl_type
->is_void()) {
2547 if (type_name
!= NULL
) {
2548 _mesa_glsl_error(& loc
, state
,
2549 "invalid type `%s' in declaration of `%s'",
2550 type_name
, decl
->identifier
);
2552 _mesa_glsl_error(& loc
, state
,
2553 "invalid type in declaration of `%s'",
2559 if (decl
->is_array
) {
2560 var_type
= process_array_type(&loc
, decl_type
, decl
->array_size
,
2562 if (var_type
->is_error())
2565 var_type
= decl_type
;
2568 var
= new(ctx
) ir_variable(var_type
, decl
->identifier
, ir_var_auto
);
2570 /* From page 22 (page 28 of the PDF) of the GLSL 1.10 specification;
2572 * "Global variables can only use the qualifiers const,
2573 * attribute, uni form, or varying. Only one may be
2576 * Local variables can only use the qualifier const."
2578 * This is relaxed in GLSL 1.30. It is also relaxed by any extension
2579 * that adds the 'layout' keyword.
2581 if ((state
->language_version
< 130)
2582 && !state
->ARB_explicit_attrib_location_enable
2583 && !state
->ARB_fragment_coord_conventions_enable
) {
2584 if (this->type
->qualifier
.flags
.q
.out
) {
2585 _mesa_glsl_error(& loc
, state
,
2586 "`out' qualifier in declaration of `%s' "
2587 "only valid for function parameters in %s.",
2588 decl
->identifier
, state
->version_string
);
2590 if (this->type
->qualifier
.flags
.q
.in
) {
2591 _mesa_glsl_error(& loc
, state
,
2592 "`in' qualifier in declaration of `%s' "
2593 "only valid for function parameters in %s.",
2594 decl
->identifier
, state
->version_string
);
2596 /* FINISHME: Test for other invalid qualifiers. */
2599 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
,
2602 if (this->type
->qualifier
.flags
.q
.invariant
) {
2603 if ((state
->target
== vertex_shader
) && !(var
->mode
== ir_var_out
||
2604 var
->mode
== ir_var_inout
)) {
2605 /* FINISHME: Note that this doesn't work for invariant on
2606 * a function signature outval
2608 _mesa_glsl_error(& loc
, state
,
2609 "`%s' cannot be marked invariant, vertex shader "
2610 "outputs only\n", var
->name
);
2611 } else if ((state
->target
== fragment_shader
) &&
2612 !(var
->mode
== ir_var_in
|| var
->mode
== ir_var_inout
)) {
2613 /* FINISHME: Note that this doesn't work for invariant on
2614 * a function signature inval
2616 _mesa_glsl_error(& loc
, state
,
2617 "`%s' cannot be marked invariant, fragment shader "
2618 "inputs only\n", var
->name
);
2622 if (state
->current_function
!= NULL
) {
2623 const char *mode
= NULL
;
2624 const char *extra
= "";
2626 /* There is no need to check for 'inout' here because the parser will
2627 * only allow that in function parameter lists.
2629 if (this->type
->qualifier
.flags
.q
.attribute
) {
2631 } else if (this->type
->qualifier
.flags
.q
.uniform
) {
2633 } else if (this->type
->qualifier
.flags
.q
.varying
) {
2635 } else if (this->type
->qualifier
.flags
.q
.in
) {
2637 extra
= " or in function parameter list";
2638 } else if (this->type
->qualifier
.flags
.q
.out
) {
2640 extra
= " or in function parameter list";
2644 _mesa_glsl_error(& loc
, state
,
2645 "%s variable `%s' must be declared at "
2647 mode
, var
->name
, extra
);
2649 } else if (var
->mode
== ir_var_in
) {
2650 var
->read_only
= true;
2652 if (state
->target
== vertex_shader
) {
2653 bool error_emitted
= false;
2655 /* From page 31 (page 37 of the PDF) of the GLSL 1.50 spec:
2657 * "Vertex shader inputs can only be float, floating-point
2658 * vectors, matrices, signed and unsigned integers and integer
2659 * vectors. Vertex shader inputs can also form arrays of these
2660 * types, but not structures."
2662 * From page 31 (page 27 of the PDF) of the GLSL 1.30 spec:
2664 * "Vertex shader inputs can only be float, floating-point
2665 * vectors, matrices, signed and unsigned integers and integer
2666 * vectors. They cannot be arrays or structures."
2668 * From page 23 (page 29 of the PDF) of the GLSL 1.20 spec:
2670 * "The attribute qualifier can be used only with float,
2671 * floating-point vectors, and matrices. Attribute variables
2672 * cannot be declared as arrays or structures."
2674 const glsl_type
*check_type
= var
->type
->is_array()
2675 ? var
->type
->fields
.array
: var
->type
;
2677 switch (check_type
->base_type
) {
2678 case GLSL_TYPE_FLOAT
:
2680 case GLSL_TYPE_UINT
:
2682 if (state
->language_version
> 120)
2686 _mesa_glsl_error(& loc
, state
,
2687 "vertex shader input / attribute cannot have "
2689 var
->type
->is_array() ? "array of " : "",
2691 error_emitted
= true;
2694 if (!error_emitted
&& (state
->language_version
<= 130)
2695 && var
->type
->is_array()) {
2696 _mesa_glsl_error(& loc
, state
,
2697 "vertex shader input / attribute cannot have "
2699 error_emitted
= true;
2704 /* Integer vertex outputs must be qualified with 'flat'.
2706 * From section 4.3.6 of the GLSL 1.30 spec:
2707 * "If a vertex output is a signed or unsigned integer or integer
2708 * vector, then it must be qualified with the interpolation qualifier
2711 if (state
->language_version
>= 130
2712 && state
->target
== vertex_shader
2713 && state
->current_function
== NULL
2714 && var
->type
->is_integer()
2715 && var
->mode
== ir_var_out
2716 && var
->interpolation
!= INTERP_QUALIFIER_FLAT
) {
2718 _mesa_glsl_error(&loc
, state
, "If a vertex output is an integer, "
2719 "then it must be qualified with 'flat'");
2723 /* Interpolation qualifiers cannot be applied to 'centroid' and
2724 * 'centroid varying'.
2726 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
2727 * "interpolation qualifiers may only precede the qualifiers in,
2728 * centroid in, out, or centroid out in a declaration. They do not apply
2729 * to the deprecated storage qualifiers varying or centroid varying."
2731 if (state
->language_version
>= 130
2732 && this->type
->qualifier
.has_interpolation()
2733 && this->type
->qualifier
.flags
.q
.varying
) {
2735 const char *i
= this->type
->qualifier
.interpolation_string();
2738 if (this->type
->qualifier
.flags
.q
.centroid
)
2739 s
= "centroid varying";
2743 _mesa_glsl_error(&loc
, state
,
2744 "qualifier '%s' cannot be applied to the "
2745 "deprecated storage qualifier '%s'", i
, s
);
2749 /* Interpolation qualifiers can only apply to vertex shader outputs and
2750 * fragment shader inputs.
2752 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
2753 * "Outputs from a vertex shader (out) and inputs to a fragment
2754 * shader (in) can be further qualified with one or more of these
2755 * interpolation qualifiers"
2757 if (state
->language_version
>= 130
2758 && this->type
->qualifier
.has_interpolation()) {
2760 const char *i
= this->type
->qualifier
.interpolation_string();
2763 switch (state
->target
) {
2765 if (this->type
->qualifier
.flags
.q
.in
) {
2766 _mesa_glsl_error(&loc
, state
,
2767 "qualifier '%s' cannot be applied to vertex "
2768 "shader inputs", i
);
2771 case fragment_shader
:
2772 if (this->type
->qualifier
.flags
.q
.out
) {
2773 _mesa_glsl_error(&loc
, state
,
2774 "qualifier '%s' cannot be applied to fragment "
2775 "shader outputs", i
);
2784 /* From section 4.3.4 of the GLSL 1.30 spec:
2785 * "It is an error to use centroid in in a vertex shader."
2787 if (state
->language_version
>= 130
2788 && this->type
->qualifier
.flags
.q
.centroid
2789 && this->type
->qualifier
.flags
.q
.in
2790 && state
->target
== vertex_shader
) {
2792 _mesa_glsl_error(&loc
, state
,
2793 "'centroid in' cannot be used in a vertex shader");
2797 /* Precision qualifiers exists only in GLSL versions 1.00 and >= 1.30.
2799 if (this->type
->specifier
->precision
!= ast_precision_none
2800 && state
->language_version
!= 100
2801 && state
->language_version
< 130) {
2803 _mesa_glsl_error(&loc
, state
,
2804 "precision qualifiers are supported only in GLSL ES "
2805 "1.00, and GLSL 1.30 and later");
2809 /* Precision qualifiers only apply to floating point and integer types.
2811 * From section 4.5.2 of the GLSL 1.30 spec:
2812 * "Any floating point or any integer declaration can have the type
2813 * preceded by one of these precision qualifiers [...] Literal
2814 * constants do not have precision qualifiers. Neither do Boolean
2817 * In GLSL ES, sampler types are also allowed.
2819 * From page 87 of the GLSL ES spec:
2820 * "RESOLUTION: Allow sampler types to take a precision qualifier."
2822 if (this->type
->specifier
->precision
!= ast_precision_none
2823 && !var
->type
->is_float()
2824 && !var
->type
->is_integer()
2825 && !(var
->type
->is_sampler() && state
->es_shader
)
2826 && !(var
->type
->is_array()
2827 && (var
->type
->fields
.array
->is_float()
2828 || var
->type
->fields
.array
->is_integer()))) {
2830 _mesa_glsl_error(&loc
, state
,
2831 "precision qualifiers apply only to floating point"
2832 "%s types", state
->es_shader
? ", integer, and sampler"
2836 /* From page 17 (page 23 of the PDF) of the GLSL 1.20 spec:
2838 * "[Sampler types] can only be declared as function
2839 * parameters or uniform variables (see Section 4.3.5
2842 if (var_type
->contains_sampler() &&
2843 !this->type
->qualifier
.flags
.q
.uniform
) {
2844 _mesa_glsl_error(&loc
, state
, "samplers must be declared uniform");
2847 /* Process the initializer and add its instructions to a temporary
2848 * list. This list will be added to the instruction stream (below) after
2849 * the declaration is added. This is done because in some cases (such as
2850 * redeclarations) the declaration may not actually be added to the
2851 * instruction stream.
2853 exec_list initializer_instructions
;
2854 ir_variable
*earlier
= get_variable_being_redeclared(var
, decl
, state
);
2856 if (decl
->initializer
!= NULL
) {
2857 result
= process_initializer((earlier
== NULL
) ? var
: earlier
,
2859 &initializer_instructions
, state
);
2862 /* From page 23 (page 29 of the PDF) of the GLSL 1.10 spec:
2864 * "It is an error to write to a const variable outside of
2865 * its declaration, so they must be initialized when
2868 if (this->type
->qualifier
.flags
.q
.constant
&& decl
->initializer
== NULL
) {
2869 _mesa_glsl_error(& loc
, state
,
2870 "const declaration of `%s' must be initialized",
2874 /* If the declaration is not a redeclaration, there are a few additional
2875 * semantic checks that must be applied. In addition, variable that was
2876 * created for the declaration should be added to the IR stream.
2878 if (earlier
== NULL
) {
2879 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
2881 * "Identifiers starting with "gl_" are reserved for use by
2882 * OpenGL, and may not be declared in a shader as either a
2883 * variable or a function."
2885 if (strncmp(decl
->identifier
, "gl_", 3) == 0)
2886 _mesa_glsl_error(& loc
, state
,
2887 "identifier `%s' uses reserved `gl_' prefix",
2889 else if (strstr(decl
->identifier
, "__")) {
2890 /* From page 14 (page 20 of the PDF) of the GLSL 1.10
2893 * "In addition, all identifiers containing two
2894 * consecutive underscores (__) are reserved as
2895 * possible future keywords."
2897 _mesa_glsl_error(& loc
, state
,
2898 "identifier `%s' uses reserved `__' string",
2902 /* Add the variable to the symbol table. Note that the initializer's
2903 * IR was already processed earlier (though it hasn't been emitted
2904 * yet), without the variable in scope.
2906 * This differs from most C-like languages, but it follows the GLSL
2907 * specification. From page 28 (page 34 of the PDF) of the GLSL 1.50
2910 * "Within a declaration, the scope of a name starts immediately
2911 * after the initializer if present or immediately after the name
2912 * being declared if not."
2914 if (!state
->symbols
->add_variable(var
)) {
2915 YYLTYPE loc
= this->get_location();
2916 _mesa_glsl_error(&loc
, state
, "name `%s' already taken in the "
2917 "current scope", decl
->identifier
);
2921 /* Push the variable declaration to the top. It means that all the
2922 * variable declarations will appear in a funny last-to-first order,
2923 * but otherwise we run into trouble if a function is prototyped, a
2924 * global var is decled, then the function is defined with usage of
2925 * the global var. See glslparsertest's CorrectModule.frag.
2927 instructions
->push_head(var
);
2930 instructions
->append_list(&initializer_instructions
);
2934 /* Generally, variable declarations do not have r-values. However,
2935 * one is used for the declaration in
2937 * while (bool b = some_condition()) {
2941 * so we return the rvalue from the last seen declaration here.
2948 ast_parameter_declarator::hir(exec_list
*instructions
,
2949 struct _mesa_glsl_parse_state
*state
)
2952 const struct glsl_type
*type
;
2953 const char *name
= NULL
;
2954 YYLTYPE loc
= this->get_location();
2956 type
= this->type
->specifier
->glsl_type(& name
, state
);
2960 _mesa_glsl_error(& loc
, state
,
2961 "invalid type `%s' in declaration of `%s'",
2962 name
, this->identifier
);
2964 _mesa_glsl_error(& loc
, state
,
2965 "invalid type in declaration of `%s'",
2969 type
= glsl_type::error_type
;
2972 /* From page 62 (page 68 of the PDF) of the GLSL 1.50 spec:
2974 * "Functions that accept no input arguments need not use void in the
2975 * argument list because prototypes (or definitions) are required and
2976 * therefore there is no ambiguity when an empty argument list "( )" is
2977 * declared. The idiom "(void)" as a parameter list is provided for
2980 * Placing this check here prevents a void parameter being set up
2981 * for a function, which avoids tripping up checks for main taking
2982 * parameters and lookups of an unnamed symbol.
2984 if (type
->is_void()) {
2985 if (this->identifier
!= NULL
)
2986 _mesa_glsl_error(& loc
, state
,
2987 "named parameter cannot have type `void'");
2993 if (formal_parameter
&& (this->identifier
== NULL
)) {
2994 _mesa_glsl_error(& loc
, state
, "formal parameter lacks a name");
2998 /* This only handles "vec4 foo[..]". The earlier specifier->glsl_type(...)
2999 * call already handled the "vec4[..] foo" case.
3001 if (this->is_array
) {
3002 type
= process_array_type(&loc
, type
, this->array_size
, state
);
3005 if (!type
->is_error() && type
->array_size() == 0) {
3006 _mesa_glsl_error(&loc
, state
, "arrays passed as parameters must have "
3007 "a declared size.");
3008 type
= glsl_type::error_type
;
3012 ir_variable
*var
= new(ctx
) ir_variable(type
, this->identifier
, ir_var_in
);
3014 /* Apply any specified qualifiers to the parameter declaration. Note that
3015 * for function parameters the default mode is 'in'.
3017 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
, & loc
);
3019 /* From page 17 (page 23 of the PDF) of the GLSL 1.20 spec:
3021 * "Samplers cannot be treated as l-values; hence cannot be used
3022 * as out or inout function parameters, nor can they be assigned
3025 if ((var
->mode
== ir_var_inout
|| var
->mode
== ir_var_out
)
3026 && type
->contains_sampler()) {
3027 _mesa_glsl_error(&loc
, state
, "out and inout parameters cannot contain samplers");
3028 type
= glsl_type::error_type
;
3031 /* From page 39 (page 45 of the PDF) of the GLSL 1.10 spec:
3033 * "When calling a function, expressions that do not evaluate to
3034 * l-values cannot be passed to parameters declared as out or inout."
3036 * From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
3038 * "Other binary or unary expressions, non-dereferenced arrays,
3039 * function names, swizzles with repeated fields, and constants
3040 * cannot be l-values."
3042 * So for GLSL 1.10, passing an array as an out or inout parameter is not
3043 * allowed. This restriction is removed in GLSL 1.20, and in GLSL ES.
3045 if ((var
->mode
== ir_var_inout
|| var
->mode
== ir_var_out
)
3046 && type
->is_array() && state
->language_version
== 110) {
3047 _mesa_glsl_error(&loc
, state
, "Arrays cannot be out or inout parameters in GLSL 1.10");
3048 type
= glsl_type::error_type
;
3051 instructions
->push_tail(var
);
3053 /* Parameter declarations do not have r-values.
3060 ast_parameter_declarator::parameters_to_hir(exec_list
*ast_parameters
,
3062 exec_list
*ir_parameters
,
3063 _mesa_glsl_parse_state
*state
)
3065 ast_parameter_declarator
*void_param
= NULL
;
3068 foreach_list_typed (ast_parameter_declarator
, param
, link
, ast_parameters
) {
3069 param
->formal_parameter
= formal
;
3070 param
->hir(ir_parameters
, state
);
3078 if ((void_param
!= NULL
) && (count
> 1)) {
3079 YYLTYPE loc
= void_param
->get_location();
3081 _mesa_glsl_error(& loc
, state
,
3082 "`void' parameter must be only parameter");
3088 emit_function(_mesa_glsl_parse_state
*state
, ir_function
*f
)
3090 /* IR invariants disallow function declarations or definitions
3091 * nested within other function definitions. But there is no
3092 * requirement about the relative order of function declarations
3093 * and definitions with respect to one another. So simply insert
3094 * the new ir_function block at the end of the toplevel instruction
3097 state
->toplevel_ir
->push_tail(f
);
3102 ast_function::hir(exec_list
*instructions
,
3103 struct _mesa_glsl_parse_state
*state
)
3106 ir_function
*f
= NULL
;
3107 ir_function_signature
*sig
= NULL
;
3108 exec_list hir_parameters
;
3110 const char *const name
= identifier
;
3112 /* New functions are always added to the top-level IR instruction stream,
3113 * so this instruction list pointer is ignored. See also emit_function
3116 (void) instructions
;
3118 /* From page 21 (page 27 of the PDF) of the GLSL 1.20 spec,
3120 * "Function declarations (prototypes) cannot occur inside of functions;
3121 * they must be at global scope, or for the built-in functions, outside
3122 * the global scope."
3124 * From page 27 (page 33 of the PDF) of the GLSL ES 1.00.16 spec,
3126 * "User defined functions may only be defined within the global scope."
3128 * Note that this language does not appear in GLSL 1.10.
3130 if ((state
->current_function
!= NULL
) && (state
->language_version
!= 110)) {
3131 YYLTYPE loc
= this->get_location();
3132 _mesa_glsl_error(&loc
, state
,
3133 "declaration of function `%s' not allowed within "
3134 "function body", name
);
3137 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
3139 * "Identifiers starting with "gl_" are reserved for use by
3140 * OpenGL, and may not be declared in a shader as either a
3141 * variable or a function."
3143 if (strncmp(name
, "gl_", 3) == 0) {
3144 YYLTYPE loc
= this->get_location();
3145 _mesa_glsl_error(&loc
, state
,
3146 "identifier `%s' uses reserved `gl_' prefix", name
);
3149 /* Convert the list of function parameters to HIR now so that they can be
3150 * used below to compare this function's signature with previously seen
3151 * signatures for functions with the same name.
3153 ast_parameter_declarator::parameters_to_hir(& this->parameters
,
3155 & hir_parameters
, state
);
3157 const char *return_type_name
;
3158 const glsl_type
*return_type
=
3159 this->return_type
->specifier
->glsl_type(& return_type_name
, state
);
3162 YYLTYPE loc
= this->get_location();
3163 _mesa_glsl_error(&loc
, state
,
3164 "function `%s' has undeclared return type `%s'",
3165 name
, return_type_name
);
3166 return_type
= glsl_type::error_type
;
3169 /* From page 56 (page 62 of the PDF) of the GLSL 1.30 spec:
3170 * "No qualifier is allowed on the return type of a function."
3172 if (this->return_type
->has_qualifiers()) {
3173 YYLTYPE loc
= this->get_location();
3174 _mesa_glsl_error(& loc
, state
,
3175 "function `%s' return type has qualifiers", name
);
3178 /* From page 17 (page 23 of the PDF) of the GLSL 1.20 spec:
3180 * "[Sampler types] can only be declared as function parameters
3181 * or uniform variables (see Section 4.3.5 "Uniform")".
3183 if (return_type
->contains_sampler()) {
3184 YYLTYPE loc
= this->get_location();
3185 _mesa_glsl_error(&loc
, state
,
3186 "function `%s' return type can't contain a sampler",
3190 /* Verify that this function's signature either doesn't match a previously
3191 * seen signature for a function with the same name, or, if a match is found,
3192 * that the previously seen signature does not have an associated definition.
3194 f
= state
->symbols
->get_function(name
);
3195 if (f
!= NULL
&& (state
->es_shader
|| f
->has_user_signature())) {
3196 sig
= f
->exact_matching_signature(&hir_parameters
);
3198 const char *badvar
= sig
->qualifiers_match(&hir_parameters
);
3199 if (badvar
!= NULL
) {
3200 YYLTYPE loc
= this->get_location();
3202 _mesa_glsl_error(&loc
, state
, "function `%s' parameter `%s' "
3203 "qualifiers don't match prototype", name
, badvar
);
3206 if (sig
->return_type
!= return_type
) {
3207 YYLTYPE loc
= this->get_location();
3209 _mesa_glsl_error(&loc
, state
, "function `%s' return type doesn't "
3210 "match prototype", name
);
3213 if (is_definition
&& sig
->is_defined
) {
3214 YYLTYPE loc
= this->get_location();
3216 _mesa_glsl_error(& loc
, state
, "function `%s' redefined", name
);
3220 f
= new(ctx
) ir_function(name
);
3221 if (!state
->symbols
->add_function(f
)) {
3222 /* This function name shadows a non-function use of the same name. */
3223 YYLTYPE loc
= this->get_location();
3225 _mesa_glsl_error(&loc
, state
, "function name `%s' conflicts with "
3226 "non-function", name
);
3230 emit_function(state
, f
);
3233 /* Verify the return type of main() */
3234 if (strcmp(name
, "main") == 0) {
3235 if (! return_type
->is_void()) {
3236 YYLTYPE loc
= this->get_location();
3238 _mesa_glsl_error(& loc
, state
, "main() must return void");
3241 if (!hir_parameters
.is_empty()) {
3242 YYLTYPE loc
= this->get_location();
3244 _mesa_glsl_error(& loc
, state
, "main() must not take any parameters");
3248 /* Finish storing the information about this new function in its signature.
3251 sig
= new(ctx
) ir_function_signature(return_type
);
3252 f
->add_signature(sig
);
3255 sig
->replace_parameters(&hir_parameters
);
3258 /* Function declarations (prototypes) do not have r-values.
3265 ast_function_definition::hir(exec_list
*instructions
,
3266 struct _mesa_glsl_parse_state
*state
)
3268 prototype
->is_definition
= true;
3269 prototype
->hir(instructions
, state
);
3271 ir_function_signature
*signature
= prototype
->signature
;
3272 if (signature
== NULL
)
3275 assert(state
->current_function
== NULL
);
3276 state
->current_function
= signature
;
3277 state
->found_return
= false;
3279 /* Duplicate parameters declared in the prototype as concrete variables.
3280 * Add these to the symbol table.
3282 state
->symbols
->push_scope();
3283 foreach_iter(exec_list_iterator
, iter
, signature
->parameters
) {
3284 ir_variable
*const var
= ((ir_instruction
*) iter
.get())->as_variable();
3286 assert(var
!= NULL
);
3288 /* The only way a parameter would "exist" is if two parameters have
3291 if (state
->symbols
->name_declared_this_scope(var
->name
)) {
3292 YYLTYPE loc
= this->get_location();
3294 _mesa_glsl_error(& loc
, state
, "parameter `%s' redeclared", var
->name
);
3296 state
->symbols
->add_variable(var
);
3300 /* Convert the body of the function to HIR. */
3301 this->body
->hir(&signature
->body
, state
);
3302 signature
->is_defined
= true;
3304 state
->symbols
->pop_scope();
3306 assert(state
->current_function
== signature
);
3307 state
->current_function
= NULL
;
3309 if (!signature
->return_type
->is_void() && !state
->found_return
) {
3310 YYLTYPE loc
= this->get_location();
3311 _mesa_glsl_error(& loc
, state
, "function `%s' has non-void return type "
3312 "%s, but no return statement",
3313 signature
->function_name(),
3314 signature
->return_type
->name
);
3317 /* Function definitions do not have r-values.
3324 ast_jump_statement::hir(exec_list
*instructions
,
3325 struct _mesa_glsl_parse_state
*state
)
3332 assert(state
->current_function
);
3334 if (opt_return_value
) {
3335 ir_rvalue
*const ret
= opt_return_value
->hir(instructions
, state
);
3337 /* The value of the return type can be NULL if the shader says
3338 * 'return foo();' and foo() is a function that returns void.
3340 * NOTE: The GLSL spec doesn't say that this is an error. The type
3341 * of the return value is void. If the return type of the function is
3342 * also void, then this should compile without error. Seriously.
3344 const glsl_type
*const ret_type
=
3345 (ret
== NULL
) ? glsl_type::void_type
: ret
->type
;
3347 /* Implicit conversions are not allowed for return values. */
3348 if (state
->current_function
->return_type
!= ret_type
) {
3349 YYLTYPE loc
= this->get_location();
3351 _mesa_glsl_error(& loc
, state
,
3352 "`return' with wrong type %s, in function `%s' "
3355 state
->current_function
->function_name(),
3356 state
->current_function
->return_type
->name
);
3359 inst
= new(ctx
) ir_return(ret
);
3361 if (state
->current_function
->return_type
->base_type
!=
3363 YYLTYPE loc
= this->get_location();
3365 _mesa_glsl_error(& loc
, state
,
3366 "`return' with no value, in function %s returning "
3368 state
->current_function
->function_name());
3370 inst
= new(ctx
) ir_return
;
3373 state
->found_return
= true;
3374 instructions
->push_tail(inst
);
3379 if (state
->target
!= fragment_shader
) {
3380 YYLTYPE loc
= this->get_location();
3382 _mesa_glsl_error(& loc
, state
,
3383 "`discard' may only appear in a fragment shader");
3385 instructions
->push_tail(new(ctx
) ir_discard
);
3390 if (mode
== ast_continue
&&
3391 state
->loop_nesting_ast
== NULL
) {
3392 YYLTYPE loc
= this->get_location();
3394 _mesa_glsl_error(& loc
, state
,
3395 "continue may only appear in a loop");
3396 } else if (mode
== ast_break
&&
3397 state
->loop_nesting_ast
== NULL
&&
3398 state
->switch_state
.switch_nesting_ast
== NULL
) {
3399 YYLTYPE loc
= this->get_location();
3401 _mesa_glsl_error(& loc
, state
,
3402 "break may only appear in a loop or a switch");
3404 /* For a loop, inline the for loop expression again,
3405 * since we don't know where near the end of
3406 * the loop body the normal copy of it
3407 * is going to be placed.
3409 if (state
->loop_nesting_ast
!= NULL
&&
3410 mode
== ast_continue
&&
3411 state
->loop_nesting_ast
->rest_expression
) {
3412 state
->loop_nesting_ast
->rest_expression
->hir(instructions
,
3416 if (state
->switch_state
.is_switch_innermost
&&
3417 mode
== ast_break
) {
3418 /* Force break out of switch by setting is_break switch state.
3420 ir_variable
*const is_break_var
= state
->switch_state
.is_break_var
;
3421 ir_dereference_variable
*const deref_is_break_var
=
3422 new(ctx
) ir_dereference_variable(is_break_var
);
3423 ir_constant
*const true_val
= new(ctx
) ir_constant(true);
3424 ir_assignment
*const set_break_var
=
3425 new(ctx
) ir_assignment(deref_is_break_var
, true_val
);
3427 instructions
->push_tail(set_break_var
);
3430 ir_loop_jump
*const jump
=
3431 new(ctx
) ir_loop_jump((mode
== ast_break
)
3432 ? ir_loop_jump::jump_break
3433 : ir_loop_jump::jump_continue
);
3434 instructions
->push_tail(jump
);
3441 /* Jump instructions do not have r-values.
3448 ast_selection_statement::hir(exec_list
*instructions
,
3449 struct _mesa_glsl_parse_state
*state
)
3453 ir_rvalue
*const condition
= this->condition
->hir(instructions
, state
);
3455 /* From page 66 (page 72 of the PDF) of the GLSL 1.50 spec:
3457 * "Any expression whose type evaluates to a Boolean can be used as the
3458 * conditional expression bool-expression. Vector types are not accepted
3459 * as the expression to if."
3461 * The checks are separated so that higher quality diagnostics can be
3462 * generated for cases where both rules are violated.
3464 if (!condition
->type
->is_boolean() || !condition
->type
->is_scalar()) {
3465 YYLTYPE loc
= this->condition
->get_location();
3467 _mesa_glsl_error(& loc
, state
, "if-statement condition must be scalar "
3471 ir_if
*const stmt
= new(ctx
) ir_if(condition
);
3473 if (then_statement
!= NULL
) {
3474 state
->symbols
->push_scope();
3475 then_statement
->hir(& stmt
->then_instructions
, state
);
3476 state
->symbols
->pop_scope();
3479 if (else_statement
!= NULL
) {
3480 state
->symbols
->push_scope();
3481 else_statement
->hir(& stmt
->else_instructions
, state
);
3482 state
->symbols
->pop_scope();
3485 instructions
->push_tail(stmt
);
3487 /* if-statements do not have r-values.
3494 ast_switch_statement::hir(exec_list
*instructions
,
3495 struct _mesa_glsl_parse_state
*state
)
3499 ir_rvalue
*const test_expression
=
3500 this->test_expression
->hir(instructions
, state
);
3502 /* From page 66 (page 55 of the PDF) of the GLSL 1.50 spec:
3504 * "The type of init-expression in a switch statement must be a
3507 if (!test_expression
->type
->is_scalar() ||
3508 !test_expression
->type
->is_integer()) {
3509 YYLTYPE loc
= this->test_expression
->get_location();
3511 _mesa_glsl_error(& loc
,
3513 "switch-statement expression must be scalar "
3517 /* Track the switch-statement nesting in a stack-like manner.
3519 struct glsl_switch_state saved
= state
->switch_state
;
3521 state
->switch_state
.is_switch_innermost
= true;
3522 state
->switch_state
.switch_nesting_ast
= this;
3523 state
->switch_state
.labels_ht
= hash_table_ctor(0, hash_table_pointer_hash
,
3524 hash_table_pointer_compare
);
3525 state
->switch_state
.previous_default
= NULL
;
3527 /* Initalize is_fallthru state to false.
3529 ir_rvalue
*const is_fallthru_val
= new (ctx
) ir_constant(false);
3530 state
->switch_state
.is_fallthru_var
=
3531 new(ctx
) ir_variable(glsl_type::bool_type
,
3532 "switch_is_fallthru_tmp",
3534 instructions
->push_tail(state
->switch_state
.is_fallthru_var
);
3536 ir_dereference_variable
*deref_is_fallthru_var
=
3537 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
3538 instructions
->push_tail(new(ctx
) ir_assignment(deref_is_fallthru_var
,
3541 /* Initalize is_break state to false.
3543 ir_rvalue
*const is_break_val
= new (ctx
) ir_constant(false);
3544 state
->switch_state
.is_break_var
= new(ctx
) ir_variable(glsl_type::bool_type
,
3545 "switch_is_break_tmp",
3547 instructions
->push_tail(state
->switch_state
.is_break_var
);
3549 ir_dereference_variable
*deref_is_break_var
=
3550 new(ctx
) ir_dereference_variable(state
->switch_state
.is_break_var
);
3551 instructions
->push_tail(new(ctx
) ir_assignment(deref_is_break_var
,
3554 /* Cache test expression.
3556 test_to_hir(instructions
, state
);
3558 /* Emit code for body of switch stmt.
3560 body
->hir(instructions
, state
);
3562 hash_table_dtor(state
->switch_state
.labels_ht
);
3564 state
->switch_state
= saved
;
3566 /* Switch statements do not have r-values. */
3572 ast_switch_statement::test_to_hir(exec_list
*instructions
,
3573 struct _mesa_glsl_parse_state
*state
)
3577 /* Cache value of test expression. */
3578 ir_rvalue
*const test_val
=
3579 test_expression
->hir(instructions
,
3582 state
->switch_state
.test_var
= new(ctx
) ir_variable(test_val
->type
,
3585 ir_dereference_variable
*deref_test_var
=
3586 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
3588 instructions
->push_tail(state
->switch_state
.test_var
);
3589 instructions
->push_tail(new(ctx
) ir_assignment(deref_test_var
, test_val
));
3594 ast_switch_body::hir(exec_list
*instructions
,
3595 struct _mesa_glsl_parse_state
*state
)
3598 stmts
->hir(instructions
, state
);
3600 /* Switch bodies do not have r-values. */
3605 ast_case_statement_list::hir(exec_list
*instructions
,
3606 struct _mesa_glsl_parse_state
*state
)
3608 foreach_list_typed (ast_case_statement
, case_stmt
, link
, & this->cases
)
3609 case_stmt
->hir(instructions
, state
);
3611 /* Case statements do not have r-values. */
3616 ast_case_statement::hir(exec_list
*instructions
,
3617 struct _mesa_glsl_parse_state
*state
)
3619 labels
->hir(instructions
, state
);
3621 /* Conditionally set fallthru state based on break state. */
3622 ir_constant
*const false_val
= new(state
) ir_constant(false);
3623 ir_dereference_variable
*const deref_is_fallthru_var
=
3624 new(state
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
3625 ir_dereference_variable
*const deref_is_break_var
=
3626 new(state
) ir_dereference_variable(state
->switch_state
.is_break_var
);
3627 ir_assignment
*const reset_fallthru_on_break
=
3628 new(state
) ir_assignment(deref_is_fallthru_var
,
3630 deref_is_break_var
);
3631 instructions
->push_tail(reset_fallthru_on_break
);
3633 /* Guard case statements depending on fallthru state. */
3634 ir_dereference_variable
*const deref_fallthru_guard
=
3635 new(state
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
3636 ir_if
*const test_fallthru
= new(state
) ir_if(deref_fallthru_guard
);
3638 foreach_list_typed (ast_node
, stmt
, link
, & this->stmts
)
3639 stmt
->hir(& test_fallthru
->then_instructions
, state
);
3641 instructions
->push_tail(test_fallthru
);
3643 /* Case statements do not have r-values. */
3649 ast_case_label_list::hir(exec_list
*instructions
,
3650 struct _mesa_glsl_parse_state
*state
)
3652 foreach_list_typed (ast_case_label
, label
, link
, & this->labels
)
3653 label
->hir(instructions
, state
);
3655 /* Case labels do not have r-values. */
3660 ast_case_label::hir(exec_list
*instructions
,
3661 struct _mesa_glsl_parse_state
*state
)
3665 ir_dereference_variable
*deref_fallthru_var
=
3666 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
3668 ir_rvalue
*const true_val
= new(ctx
) ir_constant(true);
3670 /* If not default case, ... */
3671 if (this->test_value
!= NULL
) {
3672 /* Conditionally set fallthru state based on
3673 * comparison of cached test expression value to case label.
3675 ir_rvalue
*const label_rval
= this->test_value
->hir(instructions
, state
);
3676 ir_constant
*label_const
= label_rval
->constant_expression_value();
3679 YYLTYPE loc
= this->test_value
->get_location();
3681 _mesa_glsl_error(& loc
, state
,
3682 "switch statement case label must be a "
3683 "constant expression");
3685 /* Stuff a dummy value in to allow processing to continue. */
3686 label_const
= new(ctx
) ir_constant(0);
3688 ast_expression
*previous_label
= (ast_expression
*)
3689 hash_table_find(state
->switch_state
.labels_ht
,
3690 (void *)(uintptr_t)label_const
->value
.u
[0]);
3692 if (previous_label
) {
3693 YYLTYPE loc
= this->test_value
->get_location();
3694 _mesa_glsl_error(& loc
, state
,
3695 "duplicate case value");
3697 loc
= previous_label
->get_location();
3698 _mesa_glsl_error(& loc
, state
,
3699 "this is the previous case label");
3701 hash_table_insert(state
->switch_state
.labels_ht
,
3703 (void *)(uintptr_t)label_const
->value
.u
[0]);
3707 ir_dereference_variable
*deref_test_var
=
3708 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
3710 ir_rvalue
*const test_cond
= new(ctx
) ir_expression(ir_binop_all_equal
,
3714 ir_assignment
*set_fallthru_on_test
=
3715 new(ctx
) ir_assignment(deref_fallthru_var
,
3719 instructions
->push_tail(set_fallthru_on_test
);
3720 } else { /* default case */
3721 if (state
->switch_state
.previous_default
) {
3722 YYLTYPE loc
= this->get_location();
3723 _mesa_glsl_error(& loc
, state
,
3724 "multiple default labels in one switch");
3726 loc
= state
->switch_state
.previous_default
->get_location();
3727 _mesa_glsl_error(& loc
, state
,
3728 "this is the first default label");
3730 state
->switch_state
.previous_default
= this;
3732 /* Set falltrhu state. */
3733 ir_assignment
*set_fallthru
=
3734 new(ctx
) ir_assignment(deref_fallthru_var
, true_val
);
3736 instructions
->push_tail(set_fallthru
);
3739 /* Case statements do not have r-values. */
3744 ast_iteration_statement::condition_to_hir(ir_loop
*stmt
,
3745 struct _mesa_glsl_parse_state
*state
)
3749 if (condition
!= NULL
) {
3750 ir_rvalue
*const cond
=
3751 condition
->hir(& stmt
->body_instructions
, state
);
3754 || !cond
->type
->is_boolean() || !cond
->type
->is_scalar()) {
3755 YYLTYPE loc
= condition
->get_location();
3757 _mesa_glsl_error(& loc
, state
,
3758 "loop condition must be scalar boolean");
3760 /* As the first code in the loop body, generate a block that looks
3761 * like 'if (!condition) break;' as the loop termination condition.
3763 ir_rvalue
*const not_cond
=
3764 new(ctx
) ir_expression(ir_unop_logic_not
, cond
);
3766 ir_if
*const if_stmt
= new(ctx
) ir_if(not_cond
);
3768 ir_jump
*const break_stmt
=
3769 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
3771 if_stmt
->then_instructions
.push_tail(break_stmt
);
3772 stmt
->body_instructions
.push_tail(if_stmt
);
3779 ast_iteration_statement::hir(exec_list
*instructions
,
3780 struct _mesa_glsl_parse_state
*state
)
3784 /* For-loops and while-loops start a new scope, but do-while loops do not.
3786 if (mode
!= ast_do_while
)
3787 state
->symbols
->push_scope();
3789 if (init_statement
!= NULL
)
3790 init_statement
->hir(instructions
, state
);
3792 ir_loop
*const stmt
= new(ctx
) ir_loop();
3793 instructions
->push_tail(stmt
);
3795 /* Track the current loop nesting. */
3796 ast_iteration_statement
*nesting_ast
= state
->loop_nesting_ast
;
3798 state
->loop_nesting_ast
= this;
3800 /* Likewise, indicate that following code is closest to a loop,
3801 * NOT closest to a switch.
3803 bool saved_is_switch_innermost
= state
->switch_state
.is_switch_innermost
;
3804 state
->switch_state
.is_switch_innermost
= false;
3806 if (mode
!= ast_do_while
)
3807 condition_to_hir(stmt
, state
);
3810 body
->hir(& stmt
->body_instructions
, state
);
3812 if (rest_expression
!= NULL
)
3813 rest_expression
->hir(& stmt
->body_instructions
, state
);
3815 if (mode
== ast_do_while
)
3816 condition_to_hir(stmt
, state
);
3818 if (mode
!= ast_do_while
)
3819 state
->symbols
->pop_scope();
3821 /* Restore previous nesting before returning. */
3822 state
->loop_nesting_ast
= nesting_ast
;
3823 state
->switch_state
.is_switch_innermost
= saved_is_switch_innermost
;
3825 /* Loops do not have r-values.
3832 ast_type_specifier::hir(exec_list
*instructions
,
3833 struct _mesa_glsl_parse_state
*state
)
3835 if (!this->is_precision_statement
&& this->structure
== NULL
)
3838 YYLTYPE loc
= this->get_location();
3840 if (this->precision
!= ast_precision_none
3841 && state
->language_version
!= 100
3842 && state
->language_version
< 130) {
3843 _mesa_glsl_error(&loc
, state
,
3844 "precision qualifiers exist only in "
3845 "GLSL ES 1.00, and GLSL 1.30 and later");
3848 if (this->precision
!= ast_precision_none
3849 && this->structure
!= NULL
) {
3850 _mesa_glsl_error(&loc
, state
,
3851 "precision qualifiers do not apply to structures");
3855 /* If this is a precision statement, check that the type to which it is
3856 * applied is either float or int.
3858 * From section 4.5.3 of the GLSL 1.30 spec:
3859 * "The precision statement
3860 * precision precision-qualifier type;
3861 * can be used to establish a default precision qualifier. The type
3862 * field can be either int or float [...]. Any other types or
3863 * qualifiers will result in an error.
3865 if (this->is_precision_statement
) {
3866 assert(this->precision
!= ast_precision_none
);
3867 assert(this->structure
== NULL
); /* The check for structures was
3868 * performed above. */
3869 if (this->is_array
) {
3870 _mesa_glsl_error(&loc
, state
,
3871 "default precision statements do not apply to "
3875 if (strcmp(this->type_name
, "float") != 0 &&
3876 strcmp(this->type_name
, "int") != 0) {
3877 _mesa_glsl_error(&loc
, state
,
3878 "default precision statements apply only to types "
3883 /* FINISHME: Translate precision statements into IR. */
3887 if (this->structure
!= NULL
)
3888 return this->structure
->hir(instructions
, state
);
3895 ast_struct_specifier::hir(exec_list
*instructions
,
3896 struct _mesa_glsl_parse_state
*state
)
3898 unsigned decl_count
= 0;
3900 /* Make an initial pass over the list of structure fields to determine how
3901 * many there are. Each element in this list is an ast_declarator_list.
3902 * This means that we actually need to count the number of elements in the
3903 * 'declarations' list in each of the elements.
3905 foreach_list_typed (ast_declarator_list
, decl_list
, link
,
3906 &this->declarations
) {
3907 foreach_list_const (decl_ptr
, & decl_list
->declarations
) {
3912 /* Allocate storage for the structure fields and process the field
3913 * declarations. As the declarations are processed, try to also convert
3914 * the types to HIR. This ensures that structure definitions embedded in
3915 * other structure definitions are processed.
3917 glsl_struct_field
*const fields
= ralloc_array(state
, glsl_struct_field
,
3921 foreach_list_typed (ast_declarator_list
, decl_list
, link
,
3922 &this->declarations
) {
3923 const char *type_name
;
3925 decl_list
->type
->specifier
->hir(instructions
, state
);
3927 /* Section 10.9 of the GLSL ES 1.00 specification states that
3928 * embedded structure definitions have been removed from the language.
3930 if (state
->es_shader
&& decl_list
->type
->specifier
->structure
!= NULL
) {
3931 YYLTYPE loc
= this->get_location();
3932 _mesa_glsl_error(&loc
, state
, "Embedded structure definitions are "
3933 "not allowed in GLSL ES 1.00.");
3936 const glsl_type
*decl_type
=
3937 decl_list
->type
->specifier
->glsl_type(& type_name
, state
);
3939 foreach_list_typed (ast_declaration
, decl
, link
,
3940 &decl_list
->declarations
) {
3941 const struct glsl_type
*field_type
= decl_type
;
3942 if (decl
->is_array
) {
3943 YYLTYPE loc
= decl
->get_location();
3944 field_type
= process_array_type(&loc
, decl_type
, decl
->array_size
,
3947 fields
[i
].type
= (field_type
!= NULL
)
3948 ? field_type
: glsl_type::error_type
;
3949 fields
[i
].name
= decl
->identifier
;
3954 assert(i
== decl_count
);
3956 const glsl_type
*t
=
3957 glsl_type::get_record_instance(fields
, decl_count
, this->name
);
3959 YYLTYPE loc
= this->get_location();
3960 if (!state
->symbols
->add_type(name
, t
)) {
3961 _mesa_glsl_error(& loc
, state
, "struct `%s' previously defined", name
);
3963 const glsl_type
**s
= reralloc(state
, state
->user_structures
,
3965 state
->num_user_structures
+ 1);
3967 s
[state
->num_user_structures
] = t
;
3968 state
->user_structures
= s
;
3969 state
->num_user_structures
++;
3973 /* Structure type definitions do not have r-values.
3979 ast_uniform_block::hir(exec_list
*instructions
,
3980 struct _mesa_glsl_parse_state
*state
)
3982 /* The ast_uniform_block has a list of ast_declarator_lists. We
3983 * need to turn those into ir_variables with an association
3984 * with this uniform block.
3990 detect_conflicting_assignments(struct _mesa_glsl_parse_state
*state
,
3991 exec_list
*instructions
)
3993 bool gl_FragColor_assigned
= false;
3994 bool gl_FragData_assigned
= false;
3995 bool user_defined_fs_output_assigned
= false;
3996 ir_variable
*user_defined_fs_output
= NULL
;
3998 /* It would be nice to have proper location information. */
4000 memset(&loc
, 0, sizeof(loc
));
4002 foreach_list(node
, instructions
) {
4003 ir_variable
*var
= ((ir_instruction
*)node
)->as_variable();
4005 if (!var
|| !var
->assigned
)
4008 if (strcmp(var
->name
, "gl_FragColor") == 0)
4009 gl_FragColor_assigned
= true;
4010 else if (strcmp(var
->name
, "gl_FragData") == 0)
4011 gl_FragData_assigned
= true;
4012 else if (strncmp(var
->name
, "gl_", 3) != 0) {
4013 if (state
->target
== fragment_shader
&&
4014 (var
->mode
== ir_var_out
|| var
->mode
== ir_var_inout
)) {
4015 user_defined_fs_output_assigned
= true;
4016 user_defined_fs_output
= var
;
4021 /* From the GLSL 1.30 spec:
4023 * "If a shader statically assigns a value to gl_FragColor, it
4024 * may not assign a value to any element of gl_FragData. If a
4025 * shader statically writes a value to any element of
4026 * gl_FragData, it may not assign a value to
4027 * gl_FragColor. That is, a shader may assign values to either
4028 * gl_FragColor or gl_FragData, but not both. Multiple shaders
4029 * linked together must also consistently write just one of
4030 * these variables. Similarly, if user declared output
4031 * variables are in use (statically assigned to), then the
4032 * built-in variables gl_FragColor and gl_FragData may not be
4033 * assigned to. These incorrect usages all generate compile
4036 if (gl_FragColor_assigned
&& gl_FragData_assigned
) {
4037 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
4038 "`gl_FragColor' and `gl_FragData'\n");
4039 } else if (gl_FragColor_assigned
&& user_defined_fs_output_assigned
) {
4040 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
4041 "`gl_FragColor' and `%s'\n",
4042 user_defined_fs_output
->name
);
4043 } else if (gl_FragData_assigned
&& user_defined_fs_output_assigned
) {
4044 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
4045 "`gl_FragData' and `%s'\n",
4046 user_defined_fs_output
->name
);