2 * Copyright © 2010 Intel Corporation
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
21 * DEALINGS IN THE SOFTWARE.
26 * Convert abstract syntax to to high-level intermediate reprensentation (HIR).
28 * During the conversion to HIR, the majority of the symantic checking is
29 * preformed on the program. This includes:
31 * * Symbol table management
35 * The majority of this work could be done during parsing, and the parser could
36 * probably generate HIR directly. However, this results in frequent changes
37 * to the parser code. Since we do not assume that every system this complier
38 * is built on will have Flex and Bison installed, we have to store the code
39 * generated by these tools in our version control system. In other parts of
40 * the system we've seen problems where a parser was changed but the generated
41 * code was not committed, merge conflicts where created because two developers
42 * had slightly different versions of Bison installed, etc.
44 * I have also noticed that running Bison generated parsers in GDB is very
45 * irritating. When you get a segfault on '$$ = $1->foo', you can't very
46 * well 'print $1' in GDB.
48 * As a result, my preference is to put as little C code as possible in the
49 * parser (and lexer) sources.
52 #include "main/core.h" /* for struct gl_extensions */
53 #include "glsl_symbol_table.h"
54 #include "glsl_parser_extras.h"
56 #include "glsl_types.h"
60 _mesa_ast_to_hir(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
)
62 _mesa_glsl_initialize_variables(instructions
, state
);
63 _mesa_glsl_initialize_functions(state
);
65 state
->symbols
->language_version
= state
->language_version
;
67 state
->current_function
= NULL
;
69 /* Section 4.2 of the GLSL 1.20 specification states:
70 * "The built-in functions are scoped in a scope outside the global scope
71 * users declare global variables in. That is, a shader's global scope,
72 * available for user-defined functions and global variables, is nested
73 * inside the scope containing the built-in functions."
75 * Since built-in functions like ftransform() access built-in variables,
76 * it follows that those must be in the outer scope as well.
78 * We push scope here to create this nesting effect...but don't pop.
79 * This way, a shader's globals are still in the symbol table for use
82 state
->symbols
->push_scope();
84 foreach_list_typed (ast_node
, ast
, link
, & state
->translation_unit
)
85 ast
->hir(instructions
, state
);
87 detect_recursion_unlinked(state
, instructions
);
92 * If a conversion is available, convert one operand to a different type
94 * The \c from \c ir_rvalue is converted "in place".
96 * \param to Type that the operand it to be converted to
97 * \param from Operand that is being converted
98 * \param state GLSL compiler state
101 * If a conversion is possible (or unnecessary), \c true is returned.
102 * Otherwise \c false is returned.
105 apply_implicit_conversion(const glsl_type
*to
, ir_rvalue
* &from
,
106 struct _mesa_glsl_parse_state
*state
)
109 if (to
->base_type
== from
->type
->base_type
)
112 /* This conversion was added in GLSL 1.20. If the compilation mode is
113 * GLSL 1.10, the conversion is skipped.
115 if (state
->language_version
< 120)
118 /* From page 27 (page 33 of the PDF) of the GLSL 1.50 spec:
120 * "There are no implicit array or structure conversions. For
121 * example, an array of int cannot be implicitly converted to an
122 * array of float. There are no implicit conversions between
123 * signed and unsigned integers."
125 /* FINISHME: The above comment is partially a lie. There is int/uint
126 * FINISHME: conversion for immediate constants.
128 if (!to
->is_float() || !from
->type
->is_numeric())
131 /* Convert to a floating point type with the same number of components
132 * as the original type - i.e. int to float, not int to vec4.
134 to
= glsl_type::get_instance(GLSL_TYPE_FLOAT
, from
->type
->vector_elements
,
135 from
->type
->matrix_columns
);
137 switch (from
->type
->base_type
) {
139 from
= new(ctx
) ir_expression(ir_unop_i2f
, to
, from
, NULL
);
142 from
= new(ctx
) ir_expression(ir_unop_u2f
, to
, from
, NULL
);
145 from
= new(ctx
) ir_expression(ir_unop_b2f
, to
, from
, NULL
);
155 static const struct glsl_type
*
156 arithmetic_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
158 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
160 const glsl_type
*type_a
= value_a
->type
;
161 const glsl_type
*type_b
= value_b
->type
;
163 /* From GLSL 1.50 spec, page 56:
165 * "The arithmetic binary operators add (+), subtract (-),
166 * multiply (*), and divide (/) operate on integer and
167 * floating-point scalars, vectors, and matrices."
169 if (!type_a
->is_numeric() || !type_b
->is_numeric()) {
170 _mesa_glsl_error(loc
, state
,
171 "Operands to arithmetic operators must be numeric");
172 return glsl_type::error_type
;
176 /* "If one operand is floating-point based and the other is
177 * not, then the conversions from Section 4.1.10 "Implicit
178 * Conversions" are applied to the non-floating-point-based operand."
180 if (!apply_implicit_conversion(type_a
, value_b
, state
)
181 && !apply_implicit_conversion(type_b
, value_a
, state
)) {
182 _mesa_glsl_error(loc
, state
,
183 "Could not implicitly convert operands to "
184 "arithmetic operator");
185 return glsl_type::error_type
;
187 type_a
= value_a
->type
;
188 type_b
= value_b
->type
;
190 /* "If the operands are integer types, they must both be signed or
193 * From this rule and the preceeding conversion it can be inferred that
194 * both types must be GLSL_TYPE_FLOAT, or GLSL_TYPE_UINT, or GLSL_TYPE_INT.
195 * The is_numeric check above already filtered out the case where either
196 * type is not one of these, so now the base types need only be tested for
199 if (type_a
->base_type
!= type_b
->base_type
) {
200 _mesa_glsl_error(loc
, state
,
201 "base type mismatch for arithmetic operator");
202 return glsl_type::error_type
;
205 /* "All arithmetic binary operators result in the same fundamental type
206 * (signed integer, unsigned integer, or floating-point) as the
207 * operands they operate on, after operand type conversion. After
208 * conversion, the following cases are valid
210 * * The two operands are scalars. In this case the operation is
211 * applied, resulting in a scalar."
213 if (type_a
->is_scalar() && type_b
->is_scalar())
216 /* "* One operand is a scalar, and the other is a vector or matrix.
217 * In this case, the scalar operation is applied independently to each
218 * component of the vector or matrix, resulting in the same size
221 if (type_a
->is_scalar()) {
222 if (!type_b
->is_scalar())
224 } else if (type_b
->is_scalar()) {
228 /* All of the combinations of <scalar, scalar>, <vector, scalar>,
229 * <scalar, vector>, <scalar, matrix>, and <matrix, scalar> have been
232 assert(!type_a
->is_scalar());
233 assert(!type_b
->is_scalar());
235 /* "* The two operands are vectors of the same size. In this case, the
236 * operation is done component-wise resulting in the same size
239 if (type_a
->is_vector() && type_b
->is_vector()) {
240 if (type_a
== type_b
) {
243 _mesa_glsl_error(loc
, state
,
244 "vector size mismatch for arithmetic operator");
245 return glsl_type::error_type
;
249 /* All of the combinations of <scalar, scalar>, <vector, scalar>,
250 * <scalar, vector>, <scalar, matrix>, <matrix, scalar>, and
251 * <vector, vector> have been handled. At least one of the operands must
252 * be matrix. Further, since there are no integer matrix types, the base
253 * type of both operands must be float.
255 assert(type_a
->is_matrix() || type_b
->is_matrix());
256 assert(type_a
->base_type
== GLSL_TYPE_FLOAT
);
257 assert(type_b
->base_type
== GLSL_TYPE_FLOAT
);
259 /* "* The operator is add (+), subtract (-), or divide (/), and the
260 * operands are matrices with the same number of rows and the same
261 * number of columns. In this case, the operation is done component-
262 * wise resulting in the same size matrix."
263 * * The operator is multiply (*), where both operands are matrices or
264 * one operand is a vector and the other a matrix. A right vector
265 * operand is treated as a column vector and a left vector operand as a
266 * row vector. In all these cases, it is required that the number of
267 * columns of the left operand is equal to the number of rows of the
268 * right operand. Then, the multiply (*) operation does a linear
269 * algebraic multiply, yielding an object that has the same number of
270 * rows as the left operand and the same number of columns as the right
271 * operand. Section 5.10 "Vector and Matrix Operations" explains in
272 * more detail how vectors and matrices are operated on."
275 if (type_a
== type_b
)
278 if (type_a
->is_matrix() && type_b
->is_matrix()) {
279 /* Matrix multiply. The columns of A must match the rows of B. Given
280 * the other previously tested constraints, this means the vector type
281 * of a row from A must be the same as the vector type of a column from
284 if (type_a
->row_type() == type_b
->column_type()) {
285 /* The resulting matrix has the number of columns of matrix B and
286 * the number of rows of matrix A. We get the row count of A by
287 * looking at the size of a vector that makes up a column. The
288 * transpose (size of a row) is done for B.
290 const glsl_type
*const type
=
291 glsl_type::get_instance(type_a
->base_type
,
292 type_a
->column_type()->vector_elements
,
293 type_b
->row_type()->vector_elements
);
294 assert(type
!= glsl_type::error_type
);
298 } else if (type_a
->is_matrix()) {
299 /* A is a matrix and B is a column vector. Columns of A must match
300 * rows of B. Given the other previously tested constraints, this
301 * means the vector type of a row from A must be the same as the
302 * vector the type of B.
304 if (type_a
->row_type() == type_b
) {
305 /* The resulting vector has a number of elements equal to
306 * the number of rows of matrix A. */
307 const glsl_type
*const type
=
308 glsl_type::get_instance(type_a
->base_type
,
309 type_a
->column_type()->vector_elements
,
311 assert(type
!= glsl_type::error_type
);
316 assert(type_b
->is_matrix());
318 /* A is a row vector and B is a matrix. Columns of A must match rows
319 * of B. Given the other previously tested constraints, this means
320 * the type of A must be the same as the vector type of a column from
323 if (type_a
== type_b
->column_type()) {
324 /* The resulting vector has a number of elements equal to
325 * the number of columns of matrix B. */
326 const glsl_type
*const type
=
327 glsl_type::get_instance(type_a
->base_type
,
328 type_b
->row_type()->vector_elements
,
330 assert(type
!= glsl_type::error_type
);
336 _mesa_glsl_error(loc
, state
, "size mismatch for matrix multiplication");
337 return glsl_type::error_type
;
341 /* "All other cases are illegal."
343 _mesa_glsl_error(loc
, state
, "type mismatch");
344 return glsl_type::error_type
;
348 static const struct glsl_type
*
349 unary_arithmetic_result_type(const struct glsl_type
*type
,
350 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
352 /* From GLSL 1.50 spec, page 57:
354 * "The arithmetic unary operators negate (-), post- and pre-increment
355 * and decrement (-- and ++) operate on integer or floating-point
356 * values (including vectors and matrices). All unary operators work
357 * component-wise on their operands. These result with the same type
360 if (!type
->is_numeric()) {
361 _mesa_glsl_error(loc
, state
,
362 "Operands to arithmetic operators must be numeric");
363 return glsl_type::error_type
;
370 * \brief Return the result type of a bit-logic operation.
372 * If the given types to the bit-logic operator are invalid, return
373 * glsl_type::error_type.
375 * \param type_a Type of LHS of bit-logic op
376 * \param type_b Type of RHS of bit-logic op
378 static const struct glsl_type
*
379 bit_logic_result_type(const struct glsl_type
*type_a
,
380 const struct glsl_type
*type_b
,
382 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
384 if (state
->language_version
< 130) {
385 _mesa_glsl_error(loc
, state
, "bit operations require GLSL 1.30");
386 return glsl_type::error_type
;
389 /* From page 50 (page 56 of PDF) of GLSL 1.30 spec:
391 * "The bitwise operators and (&), exclusive-or (^), and inclusive-or
392 * (|). The operands must be of type signed or unsigned integers or
395 if (!type_a
->is_integer()) {
396 _mesa_glsl_error(loc
, state
, "LHS of `%s' must be an integer",
397 ast_expression::operator_string(op
));
398 return glsl_type::error_type
;
400 if (!type_b
->is_integer()) {
401 _mesa_glsl_error(loc
, state
, "RHS of `%s' must be an integer",
402 ast_expression::operator_string(op
));
403 return glsl_type::error_type
;
406 /* "The fundamental types of the operands (signed or unsigned) must
409 if (type_a
->base_type
!= type_b
->base_type
) {
410 _mesa_glsl_error(loc
, state
, "operands of `%s' must have the same "
411 "base type", ast_expression::operator_string(op
));
412 return glsl_type::error_type
;
415 /* "The operands cannot be vectors of differing size." */
416 if (type_a
->is_vector() &&
417 type_b
->is_vector() &&
418 type_a
->vector_elements
!= type_b
->vector_elements
) {
419 _mesa_glsl_error(loc
, state
, "operands of `%s' cannot be vectors of "
420 "different sizes", ast_expression::operator_string(op
));
421 return glsl_type::error_type
;
424 /* "If one operand is a scalar and the other a vector, the scalar is
425 * applied component-wise to the vector, resulting in the same type as
426 * the vector. The fundamental types of the operands [...] will be the
427 * resulting fundamental type."
429 if (type_a
->is_scalar())
435 static const struct glsl_type
*
436 modulus_result_type(const struct glsl_type
*type_a
,
437 const struct glsl_type
*type_b
,
438 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
440 if (state
->language_version
< 130) {
441 _mesa_glsl_error(loc
, state
,
442 "operator '%%' is reserved in %s",
443 state
->version_string
);
444 return glsl_type::error_type
;
447 /* From GLSL 1.50 spec, page 56:
448 * "The operator modulus (%) operates on signed or unsigned integers or
449 * integer vectors. The operand types must both be signed or both be
452 if (!type_a
->is_integer()) {
453 _mesa_glsl_error(loc
, state
, "LHS of operator %% must be an integer.");
454 return glsl_type::error_type
;
456 if (!type_b
->is_integer()) {
457 _mesa_glsl_error(loc
, state
, "RHS of operator %% must be an integer.");
458 return glsl_type::error_type
;
460 if (type_a
->base_type
!= type_b
->base_type
) {
461 _mesa_glsl_error(loc
, state
,
462 "operands of %% must have the same base type");
463 return glsl_type::error_type
;
466 /* "The operands cannot be vectors of differing size. If one operand is
467 * a scalar and the other vector, then the scalar is applied component-
468 * wise to the vector, resulting in the same type as the vector. If both
469 * are vectors of the same size, the result is computed component-wise."
471 if (type_a
->is_vector()) {
472 if (!type_b
->is_vector()
473 || (type_a
->vector_elements
== type_b
->vector_elements
))
478 /* "The operator modulus (%) is not defined for any other data types
479 * (non-integer types)."
481 _mesa_glsl_error(loc
, state
, "type mismatch");
482 return glsl_type::error_type
;
486 static const struct glsl_type
*
487 relational_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
488 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
490 const glsl_type
*type_a
= value_a
->type
;
491 const glsl_type
*type_b
= value_b
->type
;
493 /* From GLSL 1.50 spec, page 56:
494 * "The relational operators greater than (>), less than (<), greater
495 * than or equal (>=), and less than or equal (<=) operate only on
496 * scalar integer and scalar floating-point expressions."
498 if (!type_a
->is_numeric()
499 || !type_b
->is_numeric()
500 || !type_a
->is_scalar()
501 || !type_b
->is_scalar()) {
502 _mesa_glsl_error(loc
, state
,
503 "Operands to relational operators must be scalar and "
505 return glsl_type::error_type
;
508 /* "Either the operands' types must match, or the conversions from
509 * Section 4.1.10 "Implicit Conversions" will be applied to the integer
510 * operand, after which the types must match."
512 if (!apply_implicit_conversion(type_a
, value_b
, state
)
513 && !apply_implicit_conversion(type_b
, value_a
, state
)) {
514 _mesa_glsl_error(loc
, state
,
515 "Could not implicitly convert operands to "
516 "relational operator");
517 return glsl_type::error_type
;
519 type_a
= value_a
->type
;
520 type_b
= value_b
->type
;
522 if (type_a
->base_type
!= type_b
->base_type
) {
523 _mesa_glsl_error(loc
, state
, "base type mismatch");
524 return glsl_type::error_type
;
527 /* "The result is scalar Boolean."
529 return glsl_type::bool_type
;
533 * \brief Return the result type of a bit-shift operation.
535 * If the given types to the bit-shift operator are invalid, return
536 * glsl_type::error_type.
538 * \param type_a Type of LHS of bit-shift op
539 * \param type_b Type of RHS of bit-shift op
541 static const struct glsl_type
*
542 shift_result_type(const struct glsl_type
*type_a
,
543 const struct glsl_type
*type_b
,
545 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
547 if (state
->language_version
< 130) {
548 _mesa_glsl_error(loc
, state
, "bit operations require GLSL 1.30");
549 return glsl_type::error_type
;
552 /* From page 50 (page 56 of the PDF) of the GLSL 1.30 spec:
554 * "The shift operators (<<) and (>>). For both operators, the operands
555 * must be signed or unsigned integers or integer vectors. One operand
556 * can be signed while the other is unsigned."
558 if (!type_a
->is_integer()) {
559 _mesa_glsl_error(loc
, state
, "LHS of operator %s must be an integer or "
560 "integer vector", ast_expression::operator_string(op
));
561 return glsl_type::error_type
;
564 if (!type_b
->is_integer()) {
565 _mesa_glsl_error(loc
, state
, "RHS of operator %s must be an integer or "
566 "integer vector", ast_expression::operator_string(op
));
567 return glsl_type::error_type
;
570 /* "If the first operand is a scalar, the second operand has to be
573 if (type_a
->is_scalar() && !type_b
->is_scalar()) {
574 _mesa_glsl_error(loc
, state
, "If the first operand of %s is scalar, the "
575 "second must be scalar as well",
576 ast_expression::operator_string(op
));
577 return glsl_type::error_type
;
580 /* If both operands are vectors, check that they have same number of
583 if (type_a
->is_vector() &&
584 type_b
->is_vector() &&
585 type_a
->vector_elements
!= type_b
->vector_elements
) {
586 _mesa_glsl_error(loc
, state
, "Vector operands to operator %s must "
587 "have same number of elements",
588 ast_expression::operator_string(op
));
589 return glsl_type::error_type
;
592 /* "In all cases, the resulting type will be the same type as the left
599 * Validates that a value can be assigned to a location with a specified type
601 * Validates that \c rhs can be assigned to some location. If the types are
602 * not an exact match but an automatic conversion is possible, \c rhs will be
606 * \c NULL if \c rhs cannot be assigned to a location with type \c lhs_type.
607 * Otherwise the actual RHS to be assigned will be returned. This may be
608 * \c rhs, or it may be \c rhs after some type conversion.
611 * In addition to being used for assignments, this function is used to
612 * type-check return values.
615 validate_assignment(struct _mesa_glsl_parse_state
*state
,
616 const glsl_type
*lhs_type
, ir_rvalue
*rhs
,
619 /* If there is already some error in the RHS, just return it. Anything
620 * else will lead to an avalanche of error message back to the user.
622 if (rhs
->type
->is_error())
625 /* If the types are identical, the assignment can trivially proceed.
627 if (rhs
->type
== lhs_type
)
630 /* If the array element types are the same and the size of the LHS is zero,
631 * the assignment is okay for initializers embedded in variable
634 * Note: Whole-array assignments are not permitted in GLSL 1.10, but this
635 * is handled by ir_dereference::is_lvalue.
637 if (is_initializer
&& lhs_type
->is_array() && rhs
->type
->is_array()
638 && (lhs_type
->element_type() == rhs
->type
->element_type())
639 && (lhs_type
->array_size() == 0)) {
643 /* Check for implicit conversion in GLSL 1.20 */
644 if (apply_implicit_conversion(lhs_type
, rhs
, state
)) {
645 if (rhs
->type
== lhs_type
)
653 do_assignment(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
,
654 ir_rvalue
*lhs
, ir_rvalue
*rhs
, bool is_initializer
,
658 bool error_emitted
= (lhs
->type
->is_error() || rhs
->type
->is_error());
660 if (!error_emitted
) {
661 if (lhs
->variable_referenced() != NULL
662 && lhs
->variable_referenced()->read_only
) {
663 _mesa_glsl_error(&lhs_loc
, state
,
664 "assignment to read-only variable '%s'",
665 lhs
->variable_referenced()->name
);
666 error_emitted
= true;
668 } else if (!lhs
->is_lvalue()) {
669 _mesa_glsl_error(& lhs_loc
, state
, "non-lvalue in assignment");
670 error_emitted
= true;
673 if (state
->es_shader
&& lhs
->type
->is_array()) {
674 _mesa_glsl_error(&lhs_loc
, state
, "whole array assignment is not "
675 "allowed in GLSL ES 1.00.");
676 error_emitted
= true;
681 validate_assignment(state
, lhs
->type
, rhs
, is_initializer
);
682 if (new_rhs
== NULL
) {
683 _mesa_glsl_error(& lhs_loc
, state
, "type mismatch");
687 /* If the LHS array was not declared with a size, it takes it size from
688 * the RHS. If the LHS is an l-value and a whole array, it must be a
689 * dereference of a variable. Any other case would require that the LHS
690 * is either not an l-value or not a whole array.
692 if (lhs
->type
->array_size() == 0) {
693 ir_dereference
*const d
= lhs
->as_dereference();
697 ir_variable
*const var
= d
->variable_referenced();
701 if (var
->max_array_access
>= unsigned(rhs
->type
->array_size())) {
702 /* FINISHME: This should actually log the location of the RHS. */
703 _mesa_glsl_error(& lhs_loc
, state
, "array size must be > %u due to "
705 var
->max_array_access
);
708 var
->type
= glsl_type::get_array_instance(lhs
->type
->element_type(),
709 rhs
->type
->array_size());
714 /* Most callers of do_assignment (assign, add_assign, pre_inc/dec,
715 * but not post_inc) need the converted assigned value as an rvalue
716 * to handle things like:
720 * So we always just store the computed value being assigned to a
721 * temporary and return a deref of that temporary. If the rvalue
722 * ends up not being used, the temp will get copy-propagated out.
724 ir_variable
*var
= new(ctx
) ir_variable(rhs
->type
, "assignment_tmp",
726 ir_dereference_variable
*deref_var
= new(ctx
) ir_dereference_variable(var
);
727 instructions
->push_tail(var
);
728 instructions
->push_tail(new(ctx
) ir_assignment(deref_var
,
731 deref_var
= new(ctx
) ir_dereference_variable(var
);
734 instructions
->push_tail(new(ctx
) ir_assignment(lhs
, deref_var
, NULL
));
736 return new(ctx
) ir_dereference_variable(var
);
740 get_lvalue_copy(exec_list
*instructions
, ir_rvalue
*lvalue
)
742 void *ctx
= ralloc_parent(lvalue
);
745 var
= new(ctx
) ir_variable(lvalue
->type
, "_post_incdec_tmp",
747 instructions
->push_tail(var
);
748 var
->mode
= ir_var_auto
;
750 instructions
->push_tail(new(ctx
) ir_assignment(new(ctx
) ir_dereference_variable(var
),
753 /* Once we've created this temporary, mark it read only so it's no
754 * longer considered an lvalue.
756 var
->read_only
= true;
758 return new(ctx
) ir_dereference_variable(var
);
763 ast_node::hir(exec_list
*instructions
,
764 struct _mesa_glsl_parse_state
*state
)
773 mark_whole_array_access(ir_rvalue
*access
)
775 ir_dereference_variable
*deref
= access
->as_dereference_variable();
778 deref
->var
->max_array_access
= deref
->type
->length
- 1;
783 do_comparison(void *mem_ctx
, int operation
, ir_rvalue
*op0
, ir_rvalue
*op1
)
786 ir_rvalue
*cmp
= NULL
;
788 if (operation
== ir_binop_all_equal
)
789 join_op
= ir_binop_logic_and
;
791 join_op
= ir_binop_logic_or
;
793 switch (op0
->type
->base_type
) {
794 case GLSL_TYPE_FLOAT
:
798 return new(mem_ctx
) ir_expression(operation
, op0
, op1
);
800 case GLSL_TYPE_ARRAY
: {
801 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
802 ir_rvalue
*e0
, *e1
, *result
;
804 e0
= new(mem_ctx
) ir_dereference_array(op0
->clone(mem_ctx
, NULL
),
805 new(mem_ctx
) ir_constant(i
));
806 e1
= new(mem_ctx
) ir_dereference_array(op1
->clone(mem_ctx
, NULL
),
807 new(mem_ctx
) ir_constant(i
));
808 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
811 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
817 mark_whole_array_access(op0
);
818 mark_whole_array_access(op1
);
822 case GLSL_TYPE_STRUCT
: {
823 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
824 ir_rvalue
*e0
, *e1
, *result
;
825 const char *field_name
= op0
->type
->fields
.structure
[i
].name
;
827 e0
= new(mem_ctx
) ir_dereference_record(op0
->clone(mem_ctx
, NULL
),
829 e1
= new(mem_ctx
) ir_dereference_record(op1
->clone(mem_ctx
, NULL
),
831 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
834 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
842 case GLSL_TYPE_ERROR
:
844 case GLSL_TYPE_SAMPLER
:
845 /* I assume a comparison of a struct containing a sampler just
846 * ignores the sampler present in the type.
851 assert(!"Should not get here.");
856 cmp
= new(mem_ctx
) ir_constant(true);
861 /* For logical operations, we want to ensure that the operands are
862 * scalar booleans. If it isn't, emit an error and return a constant
863 * boolean to avoid triggering cascading error messages.
866 get_scalar_boolean_operand(exec_list
*instructions
,
867 struct _mesa_glsl_parse_state
*state
,
868 ast_expression
*parent_expr
,
870 const char *operand_name
,
873 ast_expression
*expr
= parent_expr
->subexpressions
[operand
];
875 ir_rvalue
*val
= expr
->hir(instructions
, state
);
877 if (val
->type
->is_boolean() && val
->type
->is_scalar())
880 if (!*error_emitted
) {
881 YYLTYPE loc
= expr
->get_location();
882 _mesa_glsl_error(&loc
, state
, "%s of `%s' must be scalar boolean",
884 parent_expr
->operator_string(parent_expr
->oper
));
885 *error_emitted
= true;
888 return new(ctx
) ir_constant(true);
892 ast_expression::hir(exec_list
*instructions
,
893 struct _mesa_glsl_parse_state
*state
)
896 static const int operations
[AST_NUM_OPERATORS
] = {
897 -1, /* ast_assign doesn't convert to ir_expression. */
898 -1, /* ast_plus doesn't convert to ir_expression. */
922 /* Note: The following block of expression types actually convert
923 * to multiple IR instructions.
925 ir_binop_mul
, /* ast_mul_assign */
926 ir_binop_div
, /* ast_div_assign */
927 ir_binop_mod
, /* ast_mod_assign */
928 ir_binop_add
, /* ast_add_assign */
929 ir_binop_sub
, /* ast_sub_assign */
930 ir_binop_lshift
, /* ast_ls_assign */
931 ir_binop_rshift
, /* ast_rs_assign */
932 ir_binop_bit_and
, /* ast_and_assign */
933 ir_binop_bit_xor
, /* ast_xor_assign */
934 ir_binop_bit_or
, /* ast_or_assign */
936 -1, /* ast_conditional doesn't convert to ir_expression. */
937 ir_binop_add
, /* ast_pre_inc. */
938 ir_binop_sub
, /* ast_pre_dec. */
939 ir_binop_add
, /* ast_post_inc. */
940 ir_binop_sub
, /* ast_post_dec. */
941 -1, /* ast_field_selection doesn't conv to ir_expression. */
942 -1, /* ast_array_index doesn't convert to ir_expression. */
943 -1, /* ast_function_call doesn't conv to ir_expression. */
944 -1, /* ast_identifier doesn't convert to ir_expression. */
945 -1, /* ast_int_constant doesn't convert to ir_expression. */
946 -1, /* ast_uint_constant doesn't conv to ir_expression. */
947 -1, /* ast_float_constant doesn't conv to ir_expression. */
948 -1, /* ast_bool_constant doesn't conv to ir_expression. */
949 -1, /* ast_sequence doesn't convert to ir_expression. */
951 ir_rvalue
*result
= NULL
;
953 const struct glsl_type
*type
; /* a temporary variable for switch cases */
954 bool error_emitted
= false;
957 loc
= this->get_location();
959 switch (this->oper
) {
961 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
962 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
964 result
= do_assignment(instructions
, state
, op
[0], op
[1], false,
965 this->subexpressions
[0]->get_location());
966 error_emitted
= result
->type
->is_error();
971 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
973 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
975 error_emitted
= type
->is_error();
981 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
983 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
985 error_emitted
= type
->is_error();
987 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
995 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
996 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
998 type
= arithmetic_result_type(op
[0], op
[1],
999 (this->oper
== ast_mul
),
1001 error_emitted
= type
->is_error();
1003 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1008 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1009 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1011 type
= modulus_result_type(op
[0]->type
, op
[1]->type
, state
, & loc
);
1013 assert(operations
[this->oper
] == ir_binop_mod
);
1015 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1017 error_emitted
= type
->is_error();
1022 if (state
->language_version
< 130) {
1023 _mesa_glsl_error(&loc
, state
, "operator %s requires GLSL 1.30",
1024 operator_string(this->oper
));
1025 error_emitted
= true;
1028 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1029 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1030 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1032 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1034 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1041 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1042 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1044 type
= relational_result_type(op
[0], op
[1], state
, & loc
);
1046 /* The relational operators must either generate an error or result
1047 * in a scalar boolean. See page 57 of the GLSL 1.50 spec.
1049 assert(type
->is_error()
1050 || ((type
->base_type
== GLSL_TYPE_BOOL
)
1051 && type
->is_scalar()));
1053 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1055 error_emitted
= type
->is_error();
1060 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1061 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1063 /* From page 58 (page 64 of the PDF) of the GLSL 1.50 spec:
1065 * "The equality operators equal (==), and not equal (!=)
1066 * operate on all types. They result in a scalar Boolean. If
1067 * the operand types do not match, then there must be a
1068 * conversion from Section 4.1.10 "Implicit Conversions"
1069 * applied to one operand that can make them match, in which
1070 * case this conversion is done."
1072 if ((!apply_implicit_conversion(op
[0]->type
, op
[1], state
)
1073 && !apply_implicit_conversion(op
[1]->type
, op
[0], state
))
1074 || (op
[0]->type
!= op
[1]->type
)) {
1075 _mesa_glsl_error(& loc
, state
, "operands of `%s' must have the same "
1076 "type", (this->oper
== ast_equal
) ? "==" : "!=");
1077 error_emitted
= true;
1078 } else if ((state
->language_version
<= 110)
1079 && (op
[0]->type
->is_array() || op
[1]->type
->is_array())) {
1080 _mesa_glsl_error(& loc
, state
, "array comparisons forbidden in "
1082 error_emitted
= true;
1085 if (error_emitted
) {
1086 result
= new(ctx
) ir_constant(false);
1088 result
= do_comparison(ctx
, operations
[this->oper
], op
[0], op
[1]);
1089 assert(result
->type
== glsl_type::bool_type
);
1096 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1097 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1098 type
= bit_logic_result_type(op
[0]->type
, op
[1]->type
, this->oper
,
1100 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1102 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1106 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1108 if (state
->language_version
< 130) {
1109 _mesa_glsl_error(&loc
, state
, "bit-wise operations require GLSL 1.30");
1110 error_emitted
= true;
1113 if (!op
[0]->type
->is_integer()) {
1114 _mesa_glsl_error(&loc
, state
, "operand of `~' must be an integer");
1115 error_emitted
= true;
1119 result
= new(ctx
) ir_expression(ir_unop_bit_not
, type
, op
[0], NULL
);
1122 case ast_logic_and
: {
1123 exec_list rhs_instructions
;
1124 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1125 "LHS", &error_emitted
);
1126 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1127 "RHS", &error_emitted
);
1129 ir_constant
*op0_const
= op
[0]->constant_expression_value();
1131 if (op0_const
->value
.b
[0]) {
1132 instructions
->append_list(&rhs_instructions
);
1137 type
= glsl_type::bool_type
;
1139 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1142 instructions
->push_tail(tmp
);
1144 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1145 instructions
->push_tail(stmt
);
1147 stmt
->then_instructions
.append_list(&rhs_instructions
);
1148 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1149 ir_assignment
*const then_assign
=
1150 new(ctx
) ir_assignment(then_deref
, op
[1], NULL
);
1151 stmt
->then_instructions
.push_tail(then_assign
);
1153 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1154 ir_assignment
*const else_assign
=
1155 new(ctx
) ir_assignment(else_deref
, new(ctx
) ir_constant(false), NULL
);
1156 stmt
->else_instructions
.push_tail(else_assign
);
1158 result
= new(ctx
) ir_dereference_variable(tmp
);
1164 case ast_logic_or
: {
1165 exec_list rhs_instructions
;
1166 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1167 "LHS", &error_emitted
);
1168 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1169 "RHS", &error_emitted
);
1171 ir_constant
*op0_const
= op
[0]->constant_expression_value();
1173 if (op0_const
->value
.b
[0]) {
1178 type
= glsl_type::bool_type
;
1180 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1183 instructions
->push_tail(tmp
);
1185 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1186 instructions
->push_tail(stmt
);
1188 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1189 ir_assignment
*const then_assign
=
1190 new(ctx
) ir_assignment(then_deref
, new(ctx
) ir_constant(true), NULL
);
1191 stmt
->then_instructions
.push_tail(then_assign
);
1193 stmt
->else_instructions
.append_list(&rhs_instructions
);
1194 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1195 ir_assignment
*const else_assign
=
1196 new(ctx
) ir_assignment(else_deref
, op
[1], NULL
);
1197 stmt
->else_instructions
.push_tail(else_assign
);
1199 result
= new(ctx
) ir_dereference_variable(tmp
);
1206 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1208 * "The logical binary operators and (&&), or ( | | ), and
1209 * exclusive or (^^). They operate only on two Boolean
1210 * expressions and result in a Boolean expression."
1212 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0, "LHS",
1214 op
[1] = get_scalar_boolean_operand(instructions
, state
, this, 1, "RHS",
1217 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1222 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1223 "operand", &error_emitted
);
1225 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1229 case ast_mul_assign
:
1230 case ast_div_assign
:
1231 case ast_add_assign
:
1232 case ast_sub_assign
: {
1233 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1234 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1236 type
= arithmetic_result_type(op
[0], op
[1],
1237 (this->oper
== ast_mul_assign
),
1240 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1243 result
= do_assignment(instructions
, state
,
1244 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1245 this->subexpressions
[0]->get_location());
1246 error_emitted
= (op
[0]->type
->is_error());
1248 /* GLSL 1.10 does not allow array assignment. However, we don't have to
1249 * explicitly test for this because none of the binary expression
1250 * operators allow array operands either.
1256 case ast_mod_assign
: {
1257 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1258 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1260 type
= modulus_result_type(op
[0]->type
, op
[1]->type
, state
, & loc
);
1262 assert(operations
[this->oper
] == ir_binop_mod
);
1264 ir_rvalue
*temp_rhs
;
1265 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1268 result
= do_assignment(instructions
, state
,
1269 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1270 this->subexpressions
[0]->get_location());
1271 error_emitted
= type
->is_error();
1276 case ast_rs_assign
: {
1277 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1278 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1279 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1281 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1282 type
, op
[0], op
[1]);
1283 result
= do_assignment(instructions
, state
, op
[0]->clone(ctx
, NULL
),
1285 this->subexpressions
[0]->get_location());
1286 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1290 case ast_and_assign
:
1291 case ast_xor_assign
:
1292 case ast_or_assign
: {
1293 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1294 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1295 type
= bit_logic_result_type(op
[0]->type
, op
[1]->type
, this->oper
,
1297 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1298 type
, op
[0], op
[1]);
1299 result
= do_assignment(instructions
, state
, op
[0]->clone(ctx
, NULL
),
1301 this->subexpressions
[0]->get_location());
1302 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1306 case ast_conditional
: {
1307 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1309 * "The ternary selection operator (?:). It operates on three
1310 * expressions (exp1 ? exp2 : exp3). This operator evaluates the
1311 * first expression, which must result in a scalar Boolean."
1313 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1314 "condition", &error_emitted
);
1316 /* The :? operator is implemented by generating an anonymous temporary
1317 * followed by an if-statement. The last instruction in each branch of
1318 * the if-statement assigns a value to the anonymous temporary. This
1319 * temporary is the r-value of the expression.
1321 exec_list then_instructions
;
1322 exec_list else_instructions
;
1324 op
[1] = this->subexpressions
[1]->hir(&then_instructions
, state
);
1325 op
[2] = this->subexpressions
[2]->hir(&else_instructions
, state
);
1327 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1329 * "The second and third expressions can be any type, as
1330 * long their types match, or there is a conversion in
1331 * Section 4.1.10 "Implicit Conversions" that can be applied
1332 * to one of the expressions to make their types match. This
1333 * resulting matching type is the type of the entire
1336 if ((!apply_implicit_conversion(op
[1]->type
, op
[2], state
)
1337 && !apply_implicit_conversion(op
[2]->type
, op
[1], state
))
1338 || (op
[1]->type
!= op
[2]->type
)) {
1339 YYLTYPE loc
= this->subexpressions
[1]->get_location();
1341 _mesa_glsl_error(& loc
, state
, "Second and third operands of ?: "
1342 "operator must have matching types.");
1343 error_emitted
= true;
1344 type
= glsl_type::error_type
;
1349 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1351 * "The second and third expressions must be the same type, but can
1352 * be of any type other than an array."
1354 if ((state
->language_version
<= 110) && type
->is_array()) {
1355 _mesa_glsl_error(& loc
, state
, "Second and third operands of ?: "
1356 "operator must not be arrays.");
1357 error_emitted
= true;
1360 ir_constant
*cond_val
= op
[0]->constant_expression_value();
1361 ir_constant
*then_val
= op
[1]->constant_expression_value();
1362 ir_constant
*else_val
= op
[2]->constant_expression_value();
1364 if (then_instructions
.is_empty()
1365 && else_instructions
.is_empty()
1366 && (cond_val
!= NULL
) && (then_val
!= NULL
) && (else_val
!= NULL
)) {
1367 result
= (cond_val
->value
.b
[0]) ? then_val
: else_val
;
1369 ir_variable
*const tmp
=
1370 new(ctx
) ir_variable(type
, "conditional_tmp", ir_var_temporary
);
1371 instructions
->push_tail(tmp
);
1373 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1374 instructions
->push_tail(stmt
);
1376 then_instructions
.move_nodes_to(& stmt
->then_instructions
);
1377 ir_dereference
*const then_deref
=
1378 new(ctx
) ir_dereference_variable(tmp
);
1379 ir_assignment
*const then_assign
=
1380 new(ctx
) ir_assignment(then_deref
, op
[1], NULL
);
1381 stmt
->then_instructions
.push_tail(then_assign
);
1383 else_instructions
.move_nodes_to(& stmt
->else_instructions
);
1384 ir_dereference
*const else_deref
=
1385 new(ctx
) ir_dereference_variable(tmp
);
1386 ir_assignment
*const else_assign
=
1387 new(ctx
) ir_assignment(else_deref
, op
[2], NULL
);
1388 stmt
->else_instructions
.push_tail(else_assign
);
1390 result
= new(ctx
) ir_dereference_variable(tmp
);
1397 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1398 if (op
[0]->type
->base_type
== GLSL_TYPE_FLOAT
)
1399 op
[1] = new(ctx
) ir_constant(1.0f
);
1401 op
[1] = new(ctx
) ir_constant(1);
1403 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1405 ir_rvalue
*temp_rhs
;
1406 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1409 result
= do_assignment(instructions
, state
,
1410 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1411 this->subexpressions
[0]->get_location());
1412 error_emitted
= op
[0]->type
->is_error();
1417 case ast_post_dec
: {
1418 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1419 if (op
[0]->type
->base_type
== GLSL_TYPE_FLOAT
)
1420 op
[1] = new(ctx
) ir_constant(1.0f
);
1422 op
[1] = new(ctx
) ir_constant(1);
1424 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1426 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1428 ir_rvalue
*temp_rhs
;
1429 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1432 /* Get a temporary of a copy of the lvalue before it's modified.
1433 * This may get thrown away later.
1435 result
= get_lvalue_copy(instructions
, op
[0]->clone(ctx
, NULL
));
1437 (void)do_assignment(instructions
, state
,
1438 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1439 this->subexpressions
[0]->get_location());
1441 error_emitted
= op
[0]->type
->is_error();
1445 case ast_field_selection
:
1446 result
= _mesa_ast_field_selection_to_hir(this, instructions
, state
);
1449 case ast_array_index
: {
1450 YYLTYPE index_loc
= subexpressions
[1]->get_location();
1452 op
[0] = subexpressions
[0]->hir(instructions
, state
);
1453 op
[1] = subexpressions
[1]->hir(instructions
, state
);
1455 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1457 ir_rvalue
*const array
= op
[0];
1459 result
= new(ctx
) ir_dereference_array(op
[0], op
[1]);
1461 /* Do not use op[0] after this point. Use array.
1469 if (!array
->type
->is_array()
1470 && !array
->type
->is_matrix()
1471 && !array
->type
->is_vector()) {
1472 _mesa_glsl_error(& index_loc
, state
,
1473 "cannot dereference non-array / non-matrix / "
1475 error_emitted
= true;
1478 if (!op
[1]->type
->is_integer()) {
1479 _mesa_glsl_error(& index_loc
, state
,
1480 "array index must be integer type");
1481 error_emitted
= true;
1482 } else if (!op
[1]->type
->is_scalar()) {
1483 _mesa_glsl_error(& index_loc
, state
,
1484 "array index must be scalar");
1485 error_emitted
= true;
1488 /* If the array index is a constant expression and the array has a
1489 * declared size, ensure that the access is in-bounds. If the array
1490 * index is not a constant expression, ensure that the array has a
1493 ir_constant
*const const_index
= op
[1]->constant_expression_value();
1494 if (const_index
!= NULL
) {
1495 const int idx
= const_index
->value
.i
[0];
1496 const char *type_name
;
1499 if (array
->type
->is_matrix()) {
1500 type_name
= "matrix";
1501 } else if (array
->type
->is_vector()) {
1502 type_name
= "vector";
1504 type_name
= "array";
1507 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec:
1509 * "It is illegal to declare an array with a size, and then
1510 * later (in the same shader) index the same array with an
1511 * integral constant expression greater than or equal to the
1512 * declared size. It is also illegal to index an array with a
1513 * negative constant expression."
1515 if (array
->type
->is_matrix()) {
1516 if (array
->type
->row_type()->vector_elements
<= idx
) {
1517 bound
= array
->type
->row_type()->vector_elements
;
1519 } else if (array
->type
->is_vector()) {
1520 if (array
->type
->vector_elements
<= idx
) {
1521 bound
= array
->type
->vector_elements
;
1524 if ((array
->type
->array_size() > 0)
1525 && (array
->type
->array_size() <= idx
)) {
1526 bound
= array
->type
->array_size();
1531 _mesa_glsl_error(& loc
, state
, "%s index must be < %u",
1533 error_emitted
= true;
1534 } else if (idx
< 0) {
1535 _mesa_glsl_error(& loc
, state
, "%s index must be >= 0",
1537 error_emitted
= true;
1540 if (array
->type
->is_array()) {
1541 /* If the array is a variable dereference, it dereferences the
1542 * whole array, by definition. Use this to get the variable.
1544 * FINISHME: Should some methods for getting / setting / testing
1545 * FINISHME: array access limits be added to ir_dereference?
1547 ir_variable
*const v
= array
->whole_variable_referenced();
1548 if ((v
!= NULL
) && (unsigned(idx
) > v
->max_array_access
))
1549 v
->max_array_access
= idx
;
1551 } else if (array
->type
->array_size() == 0) {
1552 _mesa_glsl_error(&loc
, state
, "unsized array index must be constant");
1554 if (array
->type
->is_array()) {
1555 /* whole_variable_referenced can return NULL if the array is a
1556 * member of a structure. In this case it is safe to not update
1557 * the max_array_access field because it is never used for fields
1560 ir_variable
*v
= array
->whole_variable_referenced();
1562 v
->max_array_access
= array
->type
->array_size() - 1;
1566 /* From page 23 (29 of the PDF) of the GLSL 1.30 spec:
1568 * "Samplers aggregated into arrays within a shader (using square
1569 * brackets [ ]) can only be indexed with integral constant
1570 * expressions [...]."
1572 * This restriction was added in GLSL 1.30. Shaders using earlier version
1573 * of the language should not be rejected by the compiler front-end for
1574 * using this construct. This allows useful things such as using a loop
1575 * counter as the index to an array of samplers. If the loop in unrolled,
1576 * the code should compile correctly. Instead, emit a warning.
1578 if (array
->type
->is_array() &&
1579 array
->type
->element_type()->is_sampler() &&
1580 const_index
== NULL
) {
1582 if (state
->language_version
== 100) {
1583 _mesa_glsl_warning(&loc
, state
,
1584 "sampler arrays indexed with non-constant "
1585 "expressions is optional in GLSL ES 1.00");
1586 } else if (state
->language_version
< 130) {
1587 _mesa_glsl_warning(&loc
, state
,
1588 "sampler arrays indexed with non-constant "
1589 "expressions is forbidden in GLSL 1.30 and "
1592 _mesa_glsl_error(&loc
, state
,
1593 "sampler arrays indexed with non-constant "
1594 "expressions is forbidden in GLSL 1.30 and "
1596 error_emitted
= true;
1601 result
->type
= glsl_type::error_type
;
1606 case ast_function_call
:
1607 /* Should *NEVER* get here. ast_function_call should always be handled
1608 * by ast_function_expression::hir.
1613 case ast_identifier
: {
1614 /* ast_identifier can appear several places in a full abstract syntax
1615 * tree. This particular use must be at location specified in the grammar
1616 * as 'variable_identifier'.
1619 state
->symbols
->get_variable(this->primary_expression
.identifier
);
1621 result
= new(ctx
) ir_dereference_variable(var
);
1626 _mesa_glsl_error(& loc
, state
, "`%s' undeclared",
1627 this->primary_expression
.identifier
);
1629 error_emitted
= true;
1634 case ast_int_constant
:
1635 result
= new(ctx
) ir_constant(this->primary_expression
.int_constant
);
1638 case ast_uint_constant
:
1639 result
= new(ctx
) ir_constant(this->primary_expression
.uint_constant
);
1642 case ast_float_constant
:
1643 result
= new(ctx
) ir_constant(this->primary_expression
.float_constant
);
1646 case ast_bool_constant
:
1647 result
= new(ctx
) ir_constant(bool(this->primary_expression
.bool_constant
));
1650 case ast_sequence
: {
1651 /* It should not be possible to generate a sequence in the AST without
1652 * any expressions in it.
1654 assert(!this->expressions
.is_empty());
1656 /* The r-value of a sequence is the last expression in the sequence. If
1657 * the other expressions in the sequence do not have side-effects (and
1658 * therefore add instructions to the instruction list), they get dropped
1661 exec_node
*previous_tail_pred
= NULL
;
1662 YYLTYPE previous_operand_loc
= loc
;
1664 foreach_list_typed (ast_node
, ast
, link
, &this->expressions
) {
1665 /* If one of the operands of comma operator does not generate any
1666 * code, we want to emit a warning. At each pass through the loop
1667 * previous_tail_pred will point to the last instruction in the
1668 * stream *before* processing the previous operand. Naturally,
1669 * instructions->tail_pred will point to the last instruction in the
1670 * stream *after* processing the previous operand. If the two
1671 * pointers match, then the previous operand had no effect.
1673 * The warning behavior here differs slightly from GCC. GCC will
1674 * only emit a warning if none of the left-hand operands have an
1675 * effect. However, it will emit a warning for each. I believe that
1676 * there are some cases in C (especially with GCC extensions) where
1677 * it is useful to have an intermediate step in a sequence have no
1678 * effect, but I don't think these cases exist in GLSL. Either way,
1679 * it would be a giant hassle to replicate that behavior.
1681 if (previous_tail_pred
== instructions
->tail_pred
) {
1682 _mesa_glsl_warning(&previous_operand_loc
, state
,
1683 "left-hand operand of comma expression has "
1687 /* tail_pred is directly accessed instead of using the get_tail()
1688 * method for performance reasons. get_tail() has extra code to
1689 * return NULL when the list is empty. We don't care about that
1690 * here, so using tail_pred directly is fine.
1692 previous_tail_pred
= instructions
->tail_pred
;
1693 previous_operand_loc
= ast
->get_location();
1695 result
= ast
->hir(instructions
, state
);
1698 /* Any errors should have already been emitted in the loop above.
1700 error_emitted
= true;
1704 type
= NULL
; /* use result->type, not type. */
1705 assert(result
!= NULL
);
1707 if (result
->type
->is_error() && !error_emitted
)
1708 _mesa_glsl_error(& loc
, state
, "type mismatch");
1715 ast_expression_statement::hir(exec_list
*instructions
,
1716 struct _mesa_glsl_parse_state
*state
)
1718 /* It is possible to have expression statements that don't have an
1719 * expression. This is the solitary semicolon:
1721 * for (i = 0; i < 5; i++)
1724 * In this case the expression will be NULL. Test for NULL and don't do
1725 * anything in that case.
1727 if (expression
!= NULL
)
1728 expression
->hir(instructions
, state
);
1730 /* Statements do not have r-values.
1737 ast_compound_statement::hir(exec_list
*instructions
,
1738 struct _mesa_glsl_parse_state
*state
)
1741 state
->symbols
->push_scope();
1743 foreach_list_typed (ast_node
, ast
, link
, &this->statements
)
1744 ast
->hir(instructions
, state
);
1747 state
->symbols
->pop_scope();
1749 /* Compound statements do not have r-values.
1755 static const glsl_type
*
1756 process_array_type(YYLTYPE
*loc
, const glsl_type
*base
, ast_node
*array_size
,
1757 struct _mesa_glsl_parse_state
*state
)
1759 unsigned length
= 0;
1761 /* FINISHME: Reject delcarations of multidimensional arrays. */
1763 if (array_size
!= NULL
) {
1764 exec_list dummy_instructions
;
1765 ir_rvalue
*const ir
= array_size
->hir(& dummy_instructions
, state
);
1766 YYLTYPE loc
= array_size
->get_location();
1768 /* FINISHME: Verify that the grammar forbids side-effects in array
1769 * FINISHME: sizes. i.e., 'vec4 [x = 12] data'
1771 assert(dummy_instructions
.is_empty());
1774 if (!ir
->type
->is_integer()) {
1775 _mesa_glsl_error(& loc
, state
, "array size must be integer type");
1776 } else if (!ir
->type
->is_scalar()) {
1777 _mesa_glsl_error(& loc
, state
, "array size must be scalar type");
1779 ir_constant
*const size
= ir
->constant_expression_value();
1782 _mesa_glsl_error(& loc
, state
, "array size must be a "
1783 "constant valued expression");
1784 } else if (size
->value
.i
[0] <= 0) {
1785 _mesa_glsl_error(& loc
, state
, "array size must be > 0");
1787 assert(size
->type
== ir
->type
);
1788 length
= size
->value
.u
[0];
1792 } else if (state
->es_shader
) {
1793 /* Section 10.17 of the GLSL ES 1.00 specification states that unsized
1794 * array declarations have been removed from the language.
1796 _mesa_glsl_error(loc
, state
, "unsized array declarations are not "
1797 "allowed in GLSL ES 1.00.");
1800 return glsl_type::get_array_instance(base
, length
);
1805 ast_type_specifier::glsl_type(const char **name
,
1806 struct _mesa_glsl_parse_state
*state
) const
1808 const struct glsl_type
*type
;
1810 type
= state
->symbols
->get_type(this->type_name
);
1811 *name
= this->type_name
;
1813 if (this->is_array
) {
1814 YYLTYPE loc
= this->get_location();
1815 type
= process_array_type(&loc
, type
, this->array_size
, state
);
1823 apply_type_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
1825 struct _mesa_glsl_parse_state
*state
,
1828 if (qual
->flags
.q
.invariant
) {
1830 _mesa_glsl_error(loc
, state
,
1831 "variable `%s' may not be redeclared "
1832 "`invariant' after being used",
1839 if (qual
->flags
.q
.constant
|| qual
->flags
.q
.attribute
1840 || qual
->flags
.q
.uniform
1841 || (qual
->flags
.q
.varying
&& (state
->target
== fragment_shader
)))
1844 if (qual
->flags
.q
.centroid
)
1847 if (qual
->flags
.q
.attribute
&& state
->target
!= vertex_shader
) {
1848 var
->type
= glsl_type::error_type
;
1849 _mesa_glsl_error(loc
, state
,
1850 "`attribute' variables may not be declared in the "
1852 _mesa_glsl_shader_target_name(state
->target
));
1855 /* From page 25 (page 31 of the PDF) of the GLSL 1.10 spec:
1857 * "The varying qualifier can be used only with the data types
1858 * float, vec2, vec3, vec4, mat2, mat3, and mat4, or arrays of
1861 if (qual
->flags
.q
.varying
) {
1862 const glsl_type
*non_array_type
;
1864 if (var
->type
&& var
->type
->is_array())
1865 non_array_type
= var
->type
->fields
.array
;
1867 non_array_type
= var
->type
;
1869 if (non_array_type
&& non_array_type
->base_type
!= GLSL_TYPE_FLOAT
) {
1870 var
->type
= glsl_type::error_type
;
1871 _mesa_glsl_error(loc
, state
,
1872 "varying variables must be of base type float");
1876 /* If there is no qualifier that changes the mode of the variable, leave
1877 * the setting alone.
1879 if (qual
->flags
.q
.in
&& qual
->flags
.q
.out
)
1880 var
->mode
= ir_var_inout
;
1881 else if (qual
->flags
.q
.attribute
|| qual
->flags
.q
.in
1882 || (qual
->flags
.q
.varying
&& (state
->target
== fragment_shader
)))
1883 var
->mode
= ir_var_in
;
1884 else if (qual
->flags
.q
.out
1885 || (qual
->flags
.q
.varying
&& (state
->target
== vertex_shader
)))
1886 var
->mode
= ir_var_out
;
1887 else if (qual
->flags
.q
.uniform
)
1888 var
->mode
= ir_var_uniform
;
1890 if (state
->all_invariant
&& (state
->current_function
== NULL
)) {
1891 switch (state
->target
) {
1893 if (var
->mode
== ir_var_out
)
1894 var
->invariant
= true;
1896 case geometry_shader
:
1897 if ((var
->mode
== ir_var_in
) || (var
->mode
== ir_var_out
))
1898 var
->invariant
= true;
1900 case fragment_shader
:
1901 if (var
->mode
== ir_var_in
)
1902 var
->invariant
= true;
1907 if (qual
->flags
.q
.flat
)
1908 var
->interpolation
= ir_var_flat
;
1909 else if (qual
->flags
.q
.noperspective
)
1910 var
->interpolation
= ir_var_noperspective
;
1912 var
->interpolation
= ir_var_smooth
;
1914 var
->pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
1915 var
->origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
1916 if ((qual
->flags
.q
.origin_upper_left
|| qual
->flags
.q
.pixel_center_integer
)
1917 && (strcmp(var
->name
, "gl_FragCoord") != 0)) {
1918 const char *const qual_string
= (qual
->flags
.q
.origin_upper_left
)
1919 ? "origin_upper_left" : "pixel_center_integer";
1921 _mesa_glsl_error(loc
, state
,
1922 "layout qualifier `%s' can only be applied to "
1923 "fragment shader input `gl_FragCoord'",
1927 if (qual
->flags
.q
.explicit_location
) {
1928 const bool global_scope
= (state
->current_function
== NULL
);
1930 const char *string
= "";
1932 /* In the vertex shader only shader inputs can be given explicit
1935 * In the fragment shader only shader outputs can be given explicit
1938 switch (state
->target
) {
1940 if (!global_scope
|| (var
->mode
!= ir_var_in
)) {
1946 case geometry_shader
:
1947 _mesa_glsl_error(loc
, state
,
1948 "geometry shader variables cannot be given "
1949 "explicit locations\n");
1952 case fragment_shader
:
1953 if (!global_scope
|| (var
->mode
!= ir_var_out
)) {
1961 _mesa_glsl_error(loc
, state
,
1962 "only %s shader %s variables can be given an "
1963 "explicit location\n",
1964 _mesa_glsl_shader_target_name(state
->target
),
1967 var
->explicit_location
= true;
1969 /* This bit of silliness is needed because invalid explicit locations
1970 * are supposed to be flagged during linking. Small negative values
1971 * biased by VERT_ATTRIB_GENERIC0 or FRAG_RESULT_DATA0 could alias
1972 * built-in values (e.g., -16+VERT_ATTRIB_GENERIC0 = VERT_ATTRIB_POS).
1973 * The linker needs to be able to differentiate these cases. This
1974 * ensures that negative values stay negative.
1976 if (qual
->location
>= 0) {
1977 var
->location
= (state
->target
== vertex_shader
)
1978 ? (qual
->location
+ VERT_ATTRIB_GENERIC0
)
1979 : (qual
->location
+ FRAG_RESULT_DATA0
);
1981 var
->location
= qual
->location
;
1986 /* Does the declaration use the 'layout' keyword?
1988 const bool uses_layout
= qual
->flags
.q
.pixel_center_integer
1989 || qual
->flags
.q
.origin_upper_left
1990 || qual
->flags
.q
.explicit_location
;
1992 /* Does the declaration use the deprecated 'attribute' or 'varying'
1995 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
1996 || qual
->flags
.q
.varying
;
1998 /* Is the 'layout' keyword used with parameters that allow relaxed checking.
1999 * Many implementations of GL_ARB_fragment_coord_conventions_enable and some
2000 * implementations (only Mesa?) GL_ARB_explicit_attrib_location_enable
2001 * allowed the layout qualifier to be used with 'varying' and 'attribute'.
2002 * These extensions and all following extensions that add the 'layout'
2003 * keyword have been modified to require the use of 'in' or 'out'.
2005 * The following extension do not allow the deprecated keywords:
2007 * GL_AMD_conservative_depth
2008 * GL_ARB_gpu_shader5
2009 * GL_ARB_separate_shader_objects
2010 * GL_ARB_tesselation_shader
2011 * GL_ARB_transform_feedback3
2012 * GL_ARB_uniform_buffer_object
2014 * It is unknown whether GL_EXT_shader_image_load_store or GL_NV_gpu_shader5
2015 * allow layout with the deprecated keywords.
2017 const bool relaxed_layout_qualifier_checking
=
2018 state
->ARB_fragment_coord_conventions_enable
;
2020 if (uses_layout
&& uses_deprecated_qualifier
) {
2021 if (relaxed_layout_qualifier_checking
) {
2022 _mesa_glsl_warning(loc
, state
,
2023 "`layout' qualifier may not be used with "
2024 "`attribute' or `varying'");
2026 _mesa_glsl_error(loc
, state
,
2027 "`layout' qualifier may not be used with "
2028 "`attribute' or `varying'");
2032 /* Layout qualifiers for gl_FragDepth, which are enabled by extension
2033 * AMD_conservative_depth.
2035 int depth_layout_count
= qual
->flags
.q
.depth_any
2036 + qual
->flags
.q
.depth_greater
2037 + qual
->flags
.q
.depth_less
2038 + qual
->flags
.q
.depth_unchanged
;
2039 if (depth_layout_count
> 0
2040 && !state
->AMD_conservative_depth_enable
) {
2041 _mesa_glsl_error(loc
, state
,
2042 "extension GL_AMD_conservative_depth must be enabled "
2043 "to use depth layout qualifiers");
2044 } else if (depth_layout_count
> 0
2045 && strcmp(var
->name
, "gl_FragDepth") != 0) {
2046 _mesa_glsl_error(loc
, state
,
2047 "depth layout qualifiers can be applied only to "
2049 } else if (depth_layout_count
> 1
2050 && strcmp(var
->name
, "gl_FragDepth") == 0) {
2051 _mesa_glsl_error(loc
, state
,
2052 "at most one depth layout qualifier can be applied to "
2055 if (qual
->flags
.q
.depth_any
)
2056 var
->depth_layout
= ir_depth_layout_any
;
2057 else if (qual
->flags
.q
.depth_greater
)
2058 var
->depth_layout
= ir_depth_layout_greater
;
2059 else if (qual
->flags
.q
.depth_less
)
2060 var
->depth_layout
= ir_depth_layout_less
;
2061 else if (qual
->flags
.q
.depth_unchanged
)
2062 var
->depth_layout
= ir_depth_layout_unchanged
;
2064 var
->depth_layout
= ir_depth_layout_none
;
2066 if (var
->type
->is_array() && state
->language_version
!= 110) {
2067 var
->array_lvalue
= true;
2072 * Get the variable that is being redeclared by this declaration
2074 * Semantic checks to verify the validity of the redeclaration are also
2075 * performed. If semantic checks fail, compilation error will be emitted via
2076 * \c _mesa_glsl_error, but a non-\c NULL pointer will still be returned.
2079 * A pointer to an existing variable in the current scope if the declaration
2080 * is a redeclaration, \c NULL otherwise.
2083 get_variable_being_redeclared(ir_variable
*var
, ast_declaration
*decl
,
2084 struct _mesa_glsl_parse_state
*state
)
2086 /* Check if this declaration is actually a re-declaration, either to
2087 * resize an array or add qualifiers to an existing variable.
2089 * This is allowed for variables in the current scope, or when at
2090 * global scope (for built-ins in the implicit outer scope).
2092 ir_variable
*earlier
= state
->symbols
->get_variable(decl
->identifier
);
2093 if (earlier
== NULL
||
2094 (state
->current_function
!= NULL
&&
2095 !state
->symbols
->name_declared_this_scope(decl
->identifier
))) {
2100 YYLTYPE loc
= decl
->get_location();
2102 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec,
2104 * "It is legal to declare an array without a size and then
2105 * later re-declare the same name as an array of the same
2106 * type and specify a size."
2108 if ((earlier
->type
->array_size() == 0)
2109 && var
->type
->is_array()
2110 && (var
->type
->element_type() == earlier
->type
->element_type())) {
2111 /* FINISHME: This doesn't match the qualifiers on the two
2112 * FINISHME: declarations. It's not 100% clear whether this is
2113 * FINISHME: required or not.
2116 /* From page 54 (page 60 of the PDF) of the GLSL 1.20 spec:
2118 * "The size [of gl_TexCoord] can be at most
2119 * gl_MaxTextureCoords."
2121 const unsigned size
= unsigned(var
->type
->array_size());
2122 if ((strcmp("gl_TexCoord", var
->name
) == 0)
2123 && (size
> state
->Const
.MaxTextureCoords
)) {
2124 _mesa_glsl_error(& loc
, state
, "`gl_TexCoord' array size cannot "
2125 "be larger than gl_MaxTextureCoords (%u)\n",
2126 state
->Const
.MaxTextureCoords
);
2127 } else if ((size
> 0) && (size
<= earlier
->max_array_access
)) {
2128 _mesa_glsl_error(& loc
, state
, "array size must be > %u due to "
2130 earlier
->max_array_access
);
2133 earlier
->type
= var
->type
;
2136 } else if (state
->ARB_fragment_coord_conventions_enable
2137 && strcmp(var
->name
, "gl_FragCoord") == 0
2138 && earlier
->type
== var
->type
2139 && earlier
->mode
== var
->mode
) {
2140 /* Allow redeclaration of gl_FragCoord for ARB_fcc layout
2143 earlier
->origin_upper_left
= var
->origin_upper_left
;
2144 earlier
->pixel_center_integer
= var
->pixel_center_integer
;
2146 /* According to section 4.3.7 of the GLSL 1.30 spec,
2147 * the following built-in varaibles can be redeclared with an
2148 * interpolation qualifier:
2151 * * gl_FrontSecondaryColor
2152 * * gl_BackSecondaryColor
2154 * * gl_SecondaryColor
2156 } else if (state
->language_version
>= 130
2157 && (strcmp(var
->name
, "gl_FrontColor") == 0
2158 || strcmp(var
->name
, "gl_BackColor") == 0
2159 || strcmp(var
->name
, "gl_FrontSecondaryColor") == 0
2160 || strcmp(var
->name
, "gl_BackSecondaryColor") == 0
2161 || strcmp(var
->name
, "gl_Color") == 0
2162 || strcmp(var
->name
, "gl_SecondaryColor") == 0)
2163 && earlier
->type
== var
->type
2164 && earlier
->mode
== var
->mode
) {
2165 earlier
->interpolation
= var
->interpolation
;
2167 /* Layout qualifiers for gl_FragDepth. */
2168 } else if (state
->AMD_conservative_depth_enable
2169 && strcmp(var
->name
, "gl_FragDepth") == 0
2170 && earlier
->type
== var
->type
2171 && earlier
->mode
== var
->mode
) {
2173 /** From the AMD_conservative_depth spec:
2174 * Within any shader, the first redeclarations of gl_FragDepth
2175 * must appear before any use of gl_FragDepth.
2177 if (earlier
->used
) {
2178 _mesa_glsl_error(&loc
, state
,
2179 "the first redeclaration of gl_FragDepth "
2180 "must appear before any use of gl_FragDepth");
2183 /* Prevent inconsistent redeclaration of depth layout qualifier. */
2184 if (earlier
->depth_layout
!= ir_depth_layout_none
2185 && earlier
->depth_layout
!= var
->depth_layout
) {
2186 _mesa_glsl_error(&loc
, state
,
2187 "gl_FragDepth: depth layout is declared here "
2188 "as '%s, but it was previously declared as "
2190 depth_layout_string(var
->depth_layout
),
2191 depth_layout_string(earlier
->depth_layout
));
2194 earlier
->depth_layout
= var
->depth_layout
;
2197 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", decl
->identifier
);
2204 * Generate the IR for an initializer in a variable declaration
2207 process_initializer(ir_variable
*var
, ast_declaration
*decl
,
2208 ast_fully_specified_type
*type
,
2209 exec_list
*initializer_instructions
,
2210 struct _mesa_glsl_parse_state
*state
)
2212 ir_rvalue
*result
= NULL
;
2214 YYLTYPE initializer_loc
= decl
->initializer
->get_location();
2216 /* From page 24 (page 30 of the PDF) of the GLSL 1.10 spec:
2218 * "All uniform variables are read-only and are initialized either
2219 * directly by an application via API commands, or indirectly by
2222 if ((state
->language_version
<= 110)
2223 && (var
->mode
== ir_var_uniform
)) {
2224 _mesa_glsl_error(& initializer_loc
, state
,
2225 "cannot initialize uniforms in GLSL 1.10");
2228 if (var
->type
->is_sampler()) {
2229 _mesa_glsl_error(& initializer_loc
, state
,
2230 "cannot initialize samplers");
2233 if ((var
->mode
== ir_var_in
) && (state
->current_function
== NULL
)) {
2234 _mesa_glsl_error(& initializer_loc
, state
,
2235 "cannot initialize %s shader input / %s",
2236 _mesa_glsl_shader_target_name(state
->target
),
2237 (state
->target
== vertex_shader
)
2238 ? "attribute" : "varying");
2241 ir_dereference
*const lhs
= new(state
) ir_dereference_variable(var
);
2242 ir_rvalue
*rhs
= decl
->initializer
->hir(initializer_instructions
,
2245 /* Calculate the constant value if this is a const or uniform
2248 if (type
->qualifier
.flags
.q
.constant
2249 || type
->qualifier
.flags
.q
.uniform
) {
2250 ir_rvalue
*new_rhs
= validate_assignment(state
, var
->type
, rhs
, true);
2251 if (new_rhs
!= NULL
) {
2254 ir_constant
*constant_value
= rhs
->constant_expression_value();
2255 if (!constant_value
) {
2256 _mesa_glsl_error(& initializer_loc
, state
,
2257 "initializer of %s variable `%s' must be a "
2258 "constant expression",
2259 (type
->qualifier
.flags
.q
.constant
)
2260 ? "const" : "uniform",
2262 if (var
->type
->is_numeric()) {
2263 /* Reduce cascading errors. */
2264 var
->constant_value
= ir_constant::zero(state
, var
->type
);
2267 rhs
= constant_value
;
2268 var
->constant_value
= constant_value
;
2271 _mesa_glsl_error(&initializer_loc
, state
,
2272 "initializer of type %s cannot be assigned to "
2273 "variable of type %s",
2274 rhs
->type
->name
, var
->type
->name
);
2275 if (var
->type
->is_numeric()) {
2276 /* Reduce cascading errors. */
2277 var
->constant_value
= ir_constant::zero(state
, var
->type
);
2282 if (rhs
&& !rhs
->type
->is_error()) {
2283 bool temp
= var
->read_only
;
2284 if (type
->qualifier
.flags
.q
.constant
)
2285 var
->read_only
= false;
2287 /* Never emit code to initialize a uniform.
2289 const glsl_type
*initializer_type
;
2290 if (!type
->qualifier
.flags
.q
.uniform
) {
2291 result
= do_assignment(initializer_instructions
, state
,
2293 type
->get_location());
2294 initializer_type
= result
->type
;
2296 initializer_type
= rhs
->type
;
2298 /* If the declared variable is an unsized array, it must inherrit
2299 * its full type from the initializer. A declaration such as
2301 * uniform float a[] = float[](1.0, 2.0, 3.0, 3.0);
2305 * uniform float a[4] = float[](1.0, 2.0, 3.0, 3.0);
2307 * The assignment generated in the if-statement (below) will also
2308 * automatically handle this case for non-uniforms.
2310 * If the declared variable is not an array, the types must
2311 * already match exactly. As a result, the type assignment
2312 * here can be done unconditionally. For non-uniforms the call
2313 * to do_assignment can change the type of the initializer (via
2314 * the implicit conversion rules). For uniforms the initializer
2315 * must be a constant expression, and the type of that expression
2316 * was validated above.
2318 var
->type
= initializer_type
;
2320 var
->read_only
= temp
;
2327 ast_declarator_list::hir(exec_list
*instructions
,
2328 struct _mesa_glsl_parse_state
*state
)
2331 const struct glsl_type
*decl_type
;
2332 const char *type_name
= NULL
;
2333 ir_rvalue
*result
= NULL
;
2334 YYLTYPE loc
= this->get_location();
2336 /* From page 46 (page 52 of the PDF) of the GLSL 1.50 spec:
2338 * "To ensure that a particular output variable is invariant, it is
2339 * necessary to use the invariant qualifier. It can either be used to
2340 * qualify a previously declared variable as being invariant
2342 * invariant gl_Position; // make existing gl_Position be invariant"
2344 * In these cases the parser will set the 'invariant' flag in the declarator
2345 * list, and the type will be NULL.
2347 if (this->invariant
) {
2348 assert(this->type
== NULL
);
2350 if (state
->current_function
!= NULL
) {
2351 _mesa_glsl_error(& loc
, state
,
2352 "All uses of `invariant' keyword must be at global "
2356 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
2357 assert(!decl
->is_array
);
2358 assert(decl
->array_size
== NULL
);
2359 assert(decl
->initializer
== NULL
);
2361 ir_variable
*const earlier
=
2362 state
->symbols
->get_variable(decl
->identifier
);
2363 if (earlier
== NULL
) {
2364 _mesa_glsl_error(& loc
, state
,
2365 "Undeclared variable `%s' cannot be marked "
2366 "invariant\n", decl
->identifier
);
2367 } else if ((state
->target
== vertex_shader
)
2368 && (earlier
->mode
!= ir_var_out
)) {
2369 _mesa_glsl_error(& loc
, state
,
2370 "`%s' cannot be marked invariant, vertex shader "
2371 "outputs only\n", decl
->identifier
);
2372 } else if ((state
->target
== fragment_shader
)
2373 && (earlier
->mode
!= ir_var_in
)) {
2374 _mesa_glsl_error(& loc
, state
,
2375 "`%s' cannot be marked invariant, fragment shader "
2376 "inputs only\n", decl
->identifier
);
2377 } else if (earlier
->used
) {
2378 _mesa_glsl_error(& loc
, state
,
2379 "variable `%s' may not be redeclared "
2380 "`invariant' after being used",
2383 earlier
->invariant
= true;
2387 /* Invariant redeclarations do not have r-values.
2392 assert(this->type
!= NULL
);
2393 assert(!this->invariant
);
2395 /* The type specifier may contain a structure definition. Process that
2396 * before any of the variable declarations.
2398 (void) this->type
->specifier
->hir(instructions
, state
);
2400 decl_type
= this->type
->specifier
->glsl_type(& type_name
, state
);
2401 if (this->declarations
.is_empty()) {
2402 if (decl_type
!= NULL
) {
2403 /* Warn if this empty declaration is not for declaring a structure.
2405 if (this->type
->specifier
->structure
== NULL
) {
2406 _mesa_glsl_warning(&loc
, state
, "empty declaration");
2409 _mesa_glsl_error(& loc
, state
, "incomplete declaration");
2413 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
2414 const struct glsl_type
*var_type
;
2417 /* FINISHME: Emit a warning if a variable declaration shadows a
2418 * FINISHME: declaration at a higher scope.
2421 if ((decl_type
== NULL
) || decl_type
->is_void()) {
2422 if (type_name
!= NULL
) {
2423 _mesa_glsl_error(& loc
, state
,
2424 "invalid type `%s' in declaration of `%s'",
2425 type_name
, decl
->identifier
);
2427 _mesa_glsl_error(& loc
, state
,
2428 "invalid type in declaration of `%s'",
2434 if (decl
->is_array
) {
2435 var_type
= process_array_type(&loc
, decl_type
, decl
->array_size
,
2438 var_type
= decl_type
;
2441 var
= new(ctx
) ir_variable(var_type
, decl
->identifier
, ir_var_auto
);
2443 /* From page 22 (page 28 of the PDF) of the GLSL 1.10 specification;
2445 * "Global variables can only use the qualifiers const,
2446 * attribute, uni form, or varying. Only one may be
2449 * Local variables can only use the qualifier const."
2451 * This is relaxed in GLSL 1.30. It is also relaxed by any extension
2452 * that adds the 'layout' keyword.
2454 if ((state
->language_version
< 130)
2455 && !state
->ARB_explicit_attrib_location_enable
2456 && !state
->ARB_fragment_coord_conventions_enable
) {
2457 if (this->type
->qualifier
.flags
.q
.out
) {
2458 _mesa_glsl_error(& loc
, state
,
2459 "`out' qualifier in declaration of `%s' "
2460 "only valid for function parameters in %s.",
2461 decl
->identifier
, state
->version_string
);
2463 if (this->type
->qualifier
.flags
.q
.in
) {
2464 _mesa_glsl_error(& loc
, state
,
2465 "`in' qualifier in declaration of `%s' "
2466 "only valid for function parameters in %s.",
2467 decl
->identifier
, state
->version_string
);
2469 /* FINISHME: Test for other invalid qualifiers. */
2472 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
,
2475 if (this->type
->qualifier
.flags
.q
.invariant
) {
2476 if ((state
->target
== vertex_shader
) && !(var
->mode
== ir_var_out
||
2477 var
->mode
== ir_var_inout
)) {
2478 /* FINISHME: Note that this doesn't work for invariant on
2479 * a function signature outval
2481 _mesa_glsl_error(& loc
, state
,
2482 "`%s' cannot be marked invariant, vertex shader "
2483 "outputs only\n", var
->name
);
2484 } else if ((state
->target
== fragment_shader
) &&
2485 !(var
->mode
== ir_var_in
|| var
->mode
== ir_var_inout
)) {
2486 /* FINISHME: Note that this doesn't work for invariant on
2487 * a function signature inval
2489 _mesa_glsl_error(& loc
, state
,
2490 "`%s' cannot be marked invariant, fragment shader "
2491 "inputs only\n", var
->name
);
2495 if (state
->current_function
!= NULL
) {
2496 const char *mode
= NULL
;
2497 const char *extra
= "";
2499 /* There is no need to check for 'inout' here because the parser will
2500 * only allow that in function parameter lists.
2502 if (this->type
->qualifier
.flags
.q
.attribute
) {
2504 } else if (this->type
->qualifier
.flags
.q
.uniform
) {
2506 } else if (this->type
->qualifier
.flags
.q
.varying
) {
2508 } else if (this->type
->qualifier
.flags
.q
.in
) {
2510 extra
= " or in function parameter list";
2511 } else if (this->type
->qualifier
.flags
.q
.out
) {
2513 extra
= " or in function parameter list";
2517 _mesa_glsl_error(& loc
, state
,
2518 "%s variable `%s' must be declared at "
2520 mode
, var
->name
, extra
);
2522 } else if (var
->mode
== ir_var_in
) {
2523 var
->read_only
= true;
2525 if (state
->target
== vertex_shader
) {
2526 bool error_emitted
= false;
2528 /* From page 31 (page 37 of the PDF) of the GLSL 1.50 spec:
2530 * "Vertex shader inputs can only be float, floating-point
2531 * vectors, matrices, signed and unsigned integers and integer
2532 * vectors. Vertex shader inputs can also form arrays of these
2533 * types, but not structures."
2535 * From page 31 (page 27 of the PDF) of the GLSL 1.30 spec:
2537 * "Vertex shader inputs can only be float, floating-point
2538 * vectors, matrices, signed and unsigned integers and integer
2539 * vectors. They cannot be arrays or structures."
2541 * From page 23 (page 29 of the PDF) of the GLSL 1.20 spec:
2543 * "The attribute qualifier can be used only with float,
2544 * floating-point vectors, and matrices. Attribute variables
2545 * cannot be declared as arrays or structures."
2547 const glsl_type
*check_type
= var
->type
->is_array()
2548 ? var
->type
->fields
.array
: var
->type
;
2550 switch (check_type
->base_type
) {
2551 case GLSL_TYPE_FLOAT
:
2553 case GLSL_TYPE_UINT
:
2555 if (state
->language_version
> 120)
2559 _mesa_glsl_error(& loc
, state
,
2560 "vertex shader input / attribute cannot have "
2562 var
->type
->is_array() ? "array of " : "",
2564 error_emitted
= true;
2567 if (!error_emitted
&& (state
->language_version
<= 130)
2568 && var
->type
->is_array()) {
2569 _mesa_glsl_error(& loc
, state
,
2570 "vertex shader input / attribute cannot have "
2572 error_emitted
= true;
2577 /* Integer vertex outputs must be qualified with 'flat'.
2579 * From section 4.3.6 of the GLSL 1.30 spec:
2580 * "If a vertex output is a signed or unsigned integer or integer
2581 * vector, then it must be qualified with the interpolation qualifier
2584 if (state
->language_version
>= 130
2585 && state
->target
== vertex_shader
2586 && state
->current_function
== NULL
2587 && var
->type
->is_integer()
2588 && var
->mode
== ir_var_out
2589 && var
->interpolation
!= ir_var_flat
) {
2591 _mesa_glsl_error(&loc
, state
, "If a vertex output is an integer, "
2592 "then it must be qualified with 'flat'");
2596 /* Interpolation qualifiers cannot be applied to 'centroid' and
2597 * 'centroid varying'.
2599 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
2600 * "interpolation qualifiers may only precede the qualifiers in,
2601 * centroid in, out, or centroid out in a declaration. They do not apply
2602 * to the deprecated storage qualifiers varying or centroid varying."
2604 if (state
->language_version
>= 130
2605 && this->type
->qualifier
.has_interpolation()
2606 && this->type
->qualifier
.flags
.q
.varying
) {
2608 const char *i
= this->type
->qualifier
.interpolation_string();
2611 if (this->type
->qualifier
.flags
.q
.centroid
)
2612 s
= "centroid varying";
2616 _mesa_glsl_error(&loc
, state
,
2617 "qualifier '%s' cannot be applied to the "
2618 "deprecated storage qualifier '%s'", i
, s
);
2622 /* Interpolation qualifiers can only apply to vertex shader outputs and
2623 * fragment shader inputs.
2625 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
2626 * "Outputs from a vertex shader (out) and inputs to a fragment
2627 * shader (in) can be further qualified with one or more of these
2628 * interpolation qualifiers"
2630 if (state
->language_version
>= 130
2631 && this->type
->qualifier
.has_interpolation()) {
2633 const char *i
= this->type
->qualifier
.interpolation_string();
2636 switch (state
->target
) {
2638 if (this->type
->qualifier
.flags
.q
.in
) {
2639 _mesa_glsl_error(&loc
, state
,
2640 "qualifier '%s' cannot be applied to vertex "
2641 "shader inputs", i
);
2644 case fragment_shader
:
2645 if (this->type
->qualifier
.flags
.q
.out
) {
2646 _mesa_glsl_error(&loc
, state
,
2647 "qualifier '%s' cannot be applied to fragment "
2648 "shader outputs", i
);
2657 /* From section 4.3.4 of the GLSL 1.30 spec:
2658 * "It is an error to use centroid in in a vertex shader."
2660 if (state
->language_version
>= 130
2661 && this->type
->qualifier
.flags
.q
.centroid
2662 && this->type
->qualifier
.flags
.q
.in
2663 && state
->target
== vertex_shader
) {
2665 _mesa_glsl_error(&loc
, state
,
2666 "'centroid in' cannot be used in a vertex shader");
2670 /* Precision qualifiers exists only in GLSL versions 1.00 and >= 1.30.
2672 if (this->type
->specifier
->precision
!= ast_precision_none
2673 && state
->language_version
!= 100
2674 && state
->language_version
< 130) {
2676 _mesa_glsl_error(&loc
, state
,
2677 "precision qualifiers are supported only in GLSL ES "
2678 "1.00, and GLSL 1.30 and later");
2682 /* Precision qualifiers only apply to floating point and integer types.
2684 * From section 4.5.2 of the GLSL 1.30 spec:
2685 * "Any floating point or any integer declaration can have the type
2686 * preceded by one of these precision qualifiers [...] Literal
2687 * constants do not have precision qualifiers. Neither do Boolean
2690 * In GLSL ES, sampler types are also allowed.
2692 * From page 87 of the GLSL ES spec:
2693 * "RESOLUTION: Allow sampler types to take a precision qualifier."
2695 if (this->type
->specifier
->precision
!= ast_precision_none
2696 && !var
->type
->is_float()
2697 && !var
->type
->is_integer()
2698 && !(var
->type
->is_sampler() && state
->es_shader
)
2699 && !(var
->type
->is_array()
2700 && (var
->type
->fields
.array
->is_float()
2701 || var
->type
->fields
.array
->is_integer()))) {
2703 _mesa_glsl_error(&loc
, state
,
2704 "precision qualifiers apply only to floating point"
2705 "%s types", state
->es_shader
? ", integer, and sampler"
2709 /* From page 17 (page 23 of the PDF) of the GLSL 1.20 spec:
2711 * "[Sampler types] can only be declared as function
2712 * parameters or uniform variables (see Section 4.3.5
2715 if (var_type
->contains_sampler() &&
2716 !this->type
->qualifier
.flags
.q
.uniform
) {
2717 _mesa_glsl_error(&loc
, state
, "samplers must be declared uniform");
2720 /* Process the initializer and add its instructions to a temporary
2721 * list. This list will be added to the instruction stream (below) after
2722 * the declaration is added. This is done because in some cases (such as
2723 * redeclarations) the declaration may not actually be added to the
2724 * instruction stream.
2726 exec_list initializer_instructions
;
2727 ir_variable
*earlier
= get_variable_being_redeclared(var
, decl
, state
);
2729 if (decl
->initializer
!= NULL
) {
2730 result
= process_initializer((earlier
== NULL
) ? var
: earlier
,
2732 &initializer_instructions
, state
);
2735 /* From page 23 (page 29 of the PDF) of the GLSL 1.10 spec:
2737 * "It is an error to write to a const variable outside of
2738 * its declaration, so they must be initialized when
2741 if (this->type
->qualifier
.flags
.q
.constant
&& decl
->initializer
== NULL
) {
2742 _mesa_glsl_error(& loc
, state
,
2743 "const declaration of `%s' must be initialized",
2747 /* If the declaration is not a redeclaration, there are a few additional
2748 * semantic checks that must be applied. In addition, variable that was
2749 * created for the declaration should be added to the IR stream.
2751 if (earlier
== NULL
) {
2752 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
2754 * "Identifiers starting with "gl_" are reserved for use by
2755 * OpenGL, and may not be declared in a shader as either a
2756 * variable or a function."
2758 if (strncmp(decl
->identifier
, "gl_", 3) == 0)
2759 _mesa_glsl_error(& loc
, state
,
2760 "identifier `%s' uses reserved `gl_' prefix",
2763 /* Add the variable to the symbol table. Note that the initializer's
2764 * IR was already processed earlier (though it hasn't been emitted
2765 * yet), without the variable in scope.
2767 * This differs from most C-like languages, but it follows the GLSL
2768 * specification. From page 28 (page 34 of the PDF) of the GLSL 1.50
2771 * "Within a declaration, the scope of a name starts immediately
2772 * after the initializer if present or immediately after the name
2773 * being declared if not."
2775 if (!state
->symbols
->add_variable(var
)) {
2776 YYLTYPE loc
= this->get_location();
2777 _mesa_glsl_error(&loc
, state
, "name `%s' already taken in the "
2778 "current scope", decl
->identifier
);
2782 /* Push the variable declaration to the top. It means that all the
2783 * variable declarations will appear in a funny last-to-first order,
2784 * but otherwise we run into trouble if a function is prototyped, a
2785 * global var is decled, then the function is defined with usage of
2786 * the global var. See glslparsertest's CorrectModule.frag.
2788 instructions
->push_head(var
);
2791 instructions
->append_list(&initializer_instructions
);
2795 /* Generally, variable declarations do not have r-values. However,
2796 * one is used for the declaration in
2798 * while (bool b = some_condition()) {
2802 * so we return the rvalue from the last seen declaration here.
2809 ast_parameter_declarator::hir(exec_list
*instructions
,
2810 struct _mesa_glsl_parse_state
*state
)
2813 const struct glsl_type
*type
;
2814 const char *name
= NULL
;
2815 YYLTYPE loc
= this->get_location();
2817 type
= this->type
->specifier
->glsl_type(& name
, state
);
2821 _mesa_glsl_error(& loc
, state
,
2822 "invalid type `%s' in declaration of `%s'",
2823 name
, this->identifier
);
2825 _mesa_glsl_error(& loc
, state
,
2826 "invalid type in declaration of `%s'",
2830 type
= glsl_type::error_type
;
2833 /* From page 62 (page 68 of the PDF) of the GLSL 1.50 spec:
2835 * "Functions that accept no input arguments need not use void in the
2836 * argument list because prototypes (or definitions) are required and
2837 * therefore there is no ambiguity when an empty argument list "( )" is
2838 * declared. The idiom "(void)" as a parameter list is provided for
2841 * Placing this check here prevents a void parameter being set up
2842 * for a function, which avoids tripping up checks for main taking
2843 * parameters and lookups of an unnamed symbol.
2845 if (type
->is_void()) {
2846 if (this->identifier
!= NULL
)
2847 _mesa_glsl_error(& loc
, state
,
2848 "named parameter cannot have type `void'");
2854 if (formal_parameter
&& (this->identifier
== NULL
)) {
2855 _mesa_glsl_error(& loc
, state
, "formal parameter lacks a name");
2859 /* This only handles "vec4 foo[..]". The earlier specifier->glsl_type(...)
2860 * call already handled the "vec4[..] foo" case.
2862 if (this->is_array
) {
2863 type
= process_array_type(&loc
, type
, this->array_size
, state
);
2866 if (type
->array_size() == 0) {
2867 _mesa_glsl_error(&loc
, state
, "arrays passed as parameters must have "
2868 "a declared size.");
2869 type
= glsl_type::error_type
;
2873 ir_variable
*var
= new(ctx
) ir_variable(type
, this->identifier
, ir_var_in
);
2875 /* Apply any specified qualifiers to the parameter declaration. Note that
2876 * for function parameters the default mode is 'in'.
2878 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
, & loc
);
2880 /* From page 17 (page 23 of the PDF) of the GLSL 1.20 spec:
2882 * "Samplers cannot be treated as l-values; hence cannot be used
2883 * as out or inout function parameters, nor can they be assigned
2886 if ((var
->mode
== ir_var_inout
|| var
->mode
== ir_var_out
)
2887 && type
->contains_sampler()) {
2888 _mesa_glsl_error(&loc
, state
, "out and inout parameters cannot contain samplers");
2889 type
= glsl_type::error_type
;
2892 instructions
->push_tail(var
);
2894 /* Parameter declarations do not have r-values.
2901 ast_parameter_declarator::parameters_to_hir(exec_list
*ast_parameters
,
2903 exec_list
*ir_parameters
,
2904 _mesa_glsl_parse_state
*state
)
2906 ast_parameter_declarator
*void_param
= NULL
;
2909 foreach_list_typed (ast_parameter_declarator
, param
, link
, ast_parameters
) {
2910 param
->formal_parameter
= formal
;
2911 param
->hir(ir_parameters
, state
);
2919 if ((void_param
!= NULL
) && (count
> 1)) {
2920 YYLTYPE loc
= void_param
->get_location();
2922 _mesa_glsl_error(& loc
, state
,
2923 "`void' parameter must be only parameter");
2929 emit_function(_mesa_glsl_parse_state
*state
, exec_list
*instructions
,
2932 /* Emit the new function header */
2933 if (state
->current_function
== NULL
) {
2934 instructions
->push_tail(f
);
2936 /* IR invariants disallow function declarations or definitions nested
2937 * within other function definitions. Insert the new ir_function
2938 * block in the instruction sequence before the ir_function block
2939 * containing the current ir_function_signature.
2941 ir_function
*const curr
=
2942 const_cast<ir_function
*>(state
->current_function
->function());
2944 curr
->insert_before(f
);
2950 ast_function::hir(exec_list
*instructions
,
2951 struct _mesa_glsl_parse_state
*state
)
2954 ir_function
*f
= NULL
;
2955 ir_function_signature
*sig
= NULL
;
2956 exec_list hir_parameters
;
2958 const char *const name
= identifier
;
2960 /* From page 21 (page 27 of the PDF) of the GLSL 1.20 spec,
2962 * "Function declarations (prototypes) cannot occur inside of functions;
2963 * they must be at global scope, or for the built-in functions, outside
2964 * the global scope."
2966 * From page 27 (page 33 of the PDF) of the GLSL ES 1.00.16 spec,
2968 * "User defined functions may only be defined within the global scope."
2970 * Note that this language does not appear in GLSL 1.10.
2972 if ((state
->current_function
!= NULL
) && (state
->language_version
!= 110)) {
2973 YYLTYPE loc
= this->get_location();
2974 _mesa_glsl_error(&loc
, state
,
2975 "declaration of function `%s' not allowed within "
2976 "function body", name
);
2979 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
2981 * "Identifiers starting with "gl_" are reserved for use by
2982 * OpenGL, and may not be declared in a shader as either a
2983 * variable or a function."
2985 if (strncmp(name
, "gl_", 3) == 0) {
2986 YYLTYPE loc
= this->get_location();
2987 _mesa_glsl_error(&loc
, state
,
2988 "identifier `%s' uses reserved `gl_' prefix", name
);
2991 /* Convert the list of function parameters to HIR now so that they can be
2992 * used below to compare this function's signature with previously seen
2993 * signatures for functions with the same name.
2995 ast_parameter_declarator::parameters_to_hir(& this->parameters
,
2997 & hir_parameters
, state
);
2999 const char *return_type_name
;
3000 const glsl_type
*return_type
=
3001 this->return_type
->specifier
->glsl_type(& return_type_name
, state
);
3004 YYLTYPE loc
= this->get_location();
3005 _mesa_glsl_error(&loc
, state
,
3006 "function `%s' has undeclared return type `%s'",
3007 name
, return_type_name
);
3008 return_type
= glsl_type::error_type
;
3011 /* From page 56 (page 62 of the PDF) of the GLSL 1.30 spec:
3012 * "No qualifier is allowed on the return type of a function."
3014 if (this->return_type
->has_qualifiers()) {
3015 YYLTYPE loc
= this->get_location();
3016 _mesa_glsl_error(& loc
, state
,
3017 "function `%s' return type has qualifiers", name
);
3020 /* From page 17 (page 23 of the PDF) of the GLSL 1.20 spec:
3022 * "[Sampler types] can only be declared as function parameters
3023 * or uniform variables (see Section 4.3.5 "Uniform")".
3025 if (return_type
->contains_sampler()) {
3026 YYLTYPE loc
= this->get_location();
3027 _mesa_glsl_error(&loc
, state
,
3028 "function `%s' return type can't contain a sampler",
3032 /* Verify that this function's signature either doesn't match a previously
3033 * seen signature for a function with the same name, or, if a match is found,
3034 * that the previously seen signature does not have an associated definition.
3036 f
= state
->symbols
->get_function(name
);
3037 if (f
!= NULL
&& (state
->es_shader
|| f
->has_user_signature())) {
3038 sig
= f
->exact_matching_signature(&hir_parameters
);
3040 const char *badvar
= sig
->qualifiers_match(&hir_parameters
);
3041 if (badvar
!= NULL
) {
3042 YYLTYPE loc
= this->get_location();
3044 _mesa_glsl_error(&loc
, state
, "function `%s' parameter `%s' "
3045 "qualifiers don't match prototype", name
, badvar
);
3048 if (sig
->return_type
!= return_type
) {
3049 YYLTYPE loc
= this->get_location();
3051 _mesa_glsl_error(&loc
, state
, "function `%s' return type doesn't "
3052 "match prototype", name
);
3055 if (is_definition
&& sig
->is_defined
) {
3056 YYLTYPE loc
= this->get_location();
3058 _mesa_glsl_error(& loc
, state
, "function `%s' redefined", name
);
3062 f
= new(ctx
) ir_function(name
);
3063 if (!state
->symbols
->add_function(f
)) {
3064 /* This function name shadows a non-function use of the same name. */
3065 YYLTYPE loc
= this->get_location();
3067 _mesa_glsl_error(&loc
, state
, "function name `%s' conflicts with "
3068 "non-function", name
);
3072 emit_function(state
, instructions
, f
);
3075 /* Verify the return type of main() */
3076 if (strcmp(name
, "main") == 0) {
3077 if (! return_type
->is_void()) {
3078 YYLTYPE loc
= this->get_location();
3080 _mesa_glsl_error(& loc
, state
, "main() must return void");
3083 if (!hir_parameters
.is_empty()) {
3084 YYLTYPE loc
= this->get_location();
3086 _mesa_glsl_error(& loc
, state
, "main() must not take any parameters");
3090 /* Finish storing the information about this new function in its signature.
3093 sig
= new(ctx
) ir_function_signature(return_type
);
3094 f
->add_signature(sig
);
3097 sig
->replace_parameters(&hir_parameters
);
3100 /* Function declarations (prototypes) do not have r-values.
3107 ast_function_definition::hir(exec_list
*instructions
,
3108 struct _mesa_glsl_parse_state
*state
)
3110 prototype
->is_definition
= true;
3111 prototype
->hir(instructions
, state
);
3113 ir_function_signature
*signature
= prototype
->signature
;
3114 if (signature
== NULL
)
3117 assert(state
->current_function
== NULL
);
3118 state
->current_function
= signature
;
3119 state
->found_return
= false;
3121 /* Duplicate parameters declared in the prototype as concrete variables.
3122 * Add these to the symbol table.
3124 state
->symbols
->push_scope();
3125 foreach_iter(exec_list_iterator
, iter
, signature
->parameters
) {
3126 ir_variable
*const var
= ((ir_instruction
*) iter
.get())->as_variable();
3128 assert(var
!= NULL
);
3130 /* The only way a parameter would "exist" is if two parameters have
3133 if (state
->symbols
->name_declared_this_scope(var
->name
)) {
3134 YYLTYPE loc
= this->get_location();
3136 _mesa_glsl_error(& loc
, state
, "parameter `%s' redeclared", var
->name
);
3138 state
->symbols
->add_variable(var
);
3142 /* Convert the body of the function to HIR. */
3143 this->body
->hir(&signature
->body
, state
);
3144 signature
->is_defined
= true;
3146 state
->symbols
->pop_scope();
3148 assert(state
->current_function
== signature
);
3149 state
->current_function
= NULL
;
3151 if (!signature
->return_type
->is_void() && !state
->found_return
) {
3152 YYLTYPE loc
= this->get_location();
3153 _mesa_glsl_error(& loc
, state
, "function `%s' has non-void return type "
3154 "%s, but no return statement",
3155 signature
->function_name(),
3156 signature
->return_type
->name
);
3159 /* Function definitions do not have r-values.
3166 ast_jump_statement::hir(exec_list
*instructions
,
3167 struct _mesa_glsl_parse_state
*state
)
3174 assert(state
->current_function
);
3176 if (opt_return_value
) {
3177 ir_rvalue
*const ret
= opt_return_value
->hir(instructions
, state
);
3179 /* The value of the return type can be NULL if the shader says
3180 * 'return foo();' and foo() is a function that returns void.
3182 * NOTE: The GLSL spec doesn't say that this is an error. The type
3183 * of the return value is void. If the return type of the function is
3184 * also void, then this should compile without error. Seriously.
3186 const glsl_type
*const ret_type
=
3187 (ret
== NULL
) ? glsl_type::void_type
: ret
->type
;
3189 /* Implicit conversions are not allowed for return values. */
3190 if (state
->current_function
->return_type
!= ret_type
) {
3191 YYLTYPE loc
= this->get_location();
3193 _mesa_glsl_error(& loc
, state
,
3194 "`return' with wrong type %s, in function `%s' "
3197 state
->current_function
->function_name(),
3198 state
->current_function
->return_type
->name
);
3201 inst
= new(ctx
) ir_return(ret
);
3203 if (state
->current_function
->return_type
->base_type
!=
3205 YYLTYPE loc
= this->get_location();
3207 _mesa_glsl_error(& loc
, state
,
3208 "`return' with no value, in function %s returning "
3210 state
->current_function
->function_name());
3212 inst
= new(ctx
) ir_return
;
3215 state
->found_return
= true;
3216 instructions
->push_tail(inst
);
3221 if (state
->target
!= fragment_shader
) {
3222 YYLTYPE loc
= this->get_location();
3224 _mesa_glsl_error(& loc
, state
,
3225 "`discard' may only appear in a fragment shader");
3227 instructions
->push_tail(new(ctx
) ir_discard
);
3232 /* FINISHME: Handle switch-statements. They cannot contain 'continue',
3233 * FINISHME: and they use a different IR instruction for 'break'.
3235 /* FINISHME: Correctly handle the nesting. If a switch-statement is
3236 * FINISHME: inside a loop, a 'continue' is valid and will bind to the
3239 if (state
->loop_or_switch_nesting
== NULL
) {
3240 YYLTYPE loc
= this->get_location();
3242 _mesa_glsl_error(& loc
, state
,
3243 "`%s' may only appear in a loop",
3244 (mode
== ast_break
) ? "break" : "continue");
3246 ir_loop
*const loop
= state
->loop_or_switch_nesting
->as_loop();
3248 /* Inline the for loop expression again, since we don't know
3249 * where near the end of the loop body the normal copy of it
3250 * is going to be placed.
3252 if (mode
== ast_continue
&&
3253 state
->loop_or_switch_nesting_ast
->rest_expression
) {
3254 state
->loop_or_switch_nesting_ast
->rest_expression
->hir(instructions
,
3259 ir_loop_jump
*const jump
=
3260 new(ctx
) ir_loop_jump((mode
== ast_break
)
3261 ? ir_loop_jump::jump_break
3262 : ir_loop_jump::jump_continue
);
3263 instructions
->push_tail(jump
);
3270 /* Jump instructions do not have r-values.
3277 ast_selection_statement::hir(exec_list
*instructions
,
3278 struct _mesa_glsl_parse_state
*state
)
3282 ir_rvalue
*const condition
= this->condition
->hir(instructions
, state
);
3284 /* From page 66 (page 72 of the PDF) of the GLSL 1.50 spec:
3286 * "Any expression whose type evaluates to a Boolean can be used as the
3287 * conditional expression bool-expression. Vector types are not accepted
3288 * as the expression to if."
3290 * The checks are separated so that higher quality diagnostics can be
3291 * generated for cases where both rules are violated.
3293 if (!condition
->type
->is_boolean() || !condition
->type
->is_scalar()) {
3294 YYLTYPE loc
= this->condition
->get_location();
3296 _mesa_glsl_error(& loc
, state
, "if-statement condition must be scalar "
3300 ir_if
*const stmt
= new(ctx
) ir_if(condition
);
3302 if (then_statement
!= NULL
) {
3303 state
->symbols
->push_scope();
3304 then_statement
->hir(& stmt
->then_instructions
, state
);
3305 state
->symbols
->pop_scope();
3308 if (else_statement
!= NULL
) {
3309 state
->symbols
->push_scope();
3310 else_statement
->hir(& stmt
->else_instructions
, state
);
3311 state
->symbols
->pop_scope();
3314 instructions
->push_tail(stmt
);
3316 /* if-statements do not have r-values.
3323 ast_iteration_statement::condition_to_hir(ir_loop
*stmt
,
3324 struct _mesa_glsl_parse_state
*state
)
3328 if (condition
!= NULL
) {
3329 ir_rvalue
*const cond
=
3330 condition
->hir(& stmt
->body_instructions
, state
);
3333 || !cond
->type
->is_boolean() || !cond
->type
->is_scalar()) {
3334 YYLTYPE loc
= condition
->get_location();
3336 _mesa_glsl_error(& loc
, state
,
3337 "loop condition must be scalar boolean");
3339 /* As the first code in the loop body, generate a block that looks
3340 * like 'if (!condition) break;' as the loop termination condition.
3342 ir_rvalue
*const not_cond
=
3343 new(ctx
) ir_expression(ir_unop_logic_not
, glsl_type::bool_type
, cond
,
3346 ir_if
*const if_stmt
= new(ctx
) ir_if(not_cond
);
3348 ir_jump
*const break_stmt
=
3349 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
3351 if_stmt
->then_instructions
.push_tail(break_stmt
);
3352 stmt
->body_instructions
.push_tail(if_stmt
);
3359 ast_iteration_statement::hir(exec_list
*instructions
,
3360 struct _mesa_glsl_parse_state
*state
)
3364 /* For-loops and while-loops start a new scope, but do-while loops do not.
3366 if (mode
!= ast_do_while
)
3367 state
->symbols
->push_scope();
3369 if (init_statement
!= NULL
)
3370 init_statement
->hir(instructions
, state
);
3372 ir_loop
*const stmt
= new(ctx
) ir_loop();
3373 instructions
->push_tail(stmt
);
3375 /* Track the current loop and / or switch-statement nesting.
3377 ir_instruction
*const nesting
= state
->loop_or_switch_nesting
;
3378 ast_iteration_statement
*nesting_ast
= state
->loop_or_switch_nesting_ast
;
3380 state
->loop_or_switch_nesting
= stmt
;
3381 state
->loop_or_switch_nesting_ast
= this;
3383 if (mode
!= ast_do_while
)
3384 condition_to_hir(stmt
, state
);
3387 body
->hir(& stmt
->body_instructions
, state
);
3389 if (rest_expression
!= NULL
)
3390 rest_expression
->hir(& stmt
->body_instructions
, state
);
3392 if (mode
== ast_do_while
)
3393 condition_to_hir(stmt
, state
);
3395 if (mode
!= ast_do_while
)
3396 state
->symbols
->pop_scope();
3398 /* Restore previous nesting before returning.
3400 state
->loop_or_switch_nesting
= nesting
;
3401 state
->loop_or_switch_nesting_ast
= nesting_ast
;
3403 /* Loops do not have r-values.
3410 ast_type_specifier::hir(exec_list
*instructions
,
3411 struct _mesa_glsl_parse_state
*state
)
3413 if (!this->is_precision_statement
&& this->structure
== NULL
)
3416 YYLTYPE loc
= this->get_location();
3418 if (this->precision
!= ast_precision_none
3419 && state
->language_version
!= 100
3420 && state
->language_version
< 130) {
3421 _mesa_glsl_error(&loc
, state
,
3422 "precision qualifiers exist only in "
3423 "GLSL ES 1.00, and GLSL 1.30 and later");
3426 if (this->precision
!= ast_precision_none
3427 && this->structure
!= NULL
) {
3428 _mesa_glsl_error(&loc
, state
,
3429 "precision qualifiers do not apply to structures");
3433 /* If this is a precision statement, check that the type to which it is
3434 * applied is either float or int.
3436 * From section 4.5.3 of the GLSL 1.30 spec:
3437 * "The precision statement
3438 * precision precision-qualifier type;
3439 * can be used to establish a default precision qualifier. The type
3440 * field can be either int or float [...]. Any other types or
3441 * qualifiers will result in an error.
3443 if (this->is_precision_statement
) {
3444 assert(this->precision
!= ast_precision_none
);
3445 assert(this->structure
== NULL
); /* The check for structures was
3446 * performed above. */
3447 if (this->is_array
) {
3448 _mesa_glsl_error(&loc
, state
,
3449 "default precision statements do not apply to "
3453 if (this->type_specifier
!= ast_float
3454 && this->type_specifier
!= ast_int
) {
3455 _mesa_glsl_error(&loc
, state
,
3456 "default precision statements apply only to types "
3461 /* FINISHME: Translate precision statements into IR. */
3465 if (this->structure
!= NULL
)
3466 return this->structure
->hir(instructions
, state
);
3473 ast_struct_specifier::hir(exec_list
*instructions
,
3474 struct _mesa_glsl_parse_state
*state
)
3476 unsigned decl_count
= 0;
3478 /* Make an initial pass over the list of structure fields to determine how
3479 * many there are. Each element in this list is an ast_declarator_list.
3480 * This means that we actually need to count the number of elements in the
3481 * 'declarations' list in each of the elements.
3483 foreach_list_typed (ast_declarator_list
, decl_list
, link
,
3484 &this->declarations
) {
3485 foreach_list_const (decl_ptr
, & decl_list
->declarations
) {
3490 /* Allocate storage for the structure fields and process the field
3491 * declarations. As the declarations are processed, try to also convert
3492 * the types to HIR. This ensures that structure definitions embedded in
3493 * other structure definitions are processed.
3495 glsl_struct_field
*const fields
= ralloc_array(state
, glsl_struct_field
,
3499 foreach_list_typed (ast_declarator_list
, decl_list
, link
,
3500 &this->declarations
) {
3501 const char *type_name
;
3503 decl_list
->type
->specifier
->hir(instructions
, state
);
3505 /* Section 10.9 of the GLSL ES 1.00 specification states that
3506 * embedded structure definitions have been removed from the language.
3508 if (state
->es_shader
&& decl_list
->type
->specifier
->structure
!= NULL
) {
3509 YYLTYPE loc
= this->get_location();
3510 _mesa_glsl_error(&loc
, state
, "Embedded structure definitions are "
3511 "not allowed in GLSL ES 1.00.");
3514 const glsl_type
*decl_type
=
3515 decl_list
->type
->specifier
->glsl_type(& type_name
, state
);
3517 foreach_list_typed (ast_declaration
, decl
, link
,
3518 &decl_list
->declarations
) {
3519 const struct glsl_type
*field_type
= decl_type
;
3520 if (decl
->is_array
) {
3521 YYLTYPE loc
= decl
->get_location();
3522 field_type
= process_array_type(&loc
, decl_type
, decl
->array_size
,
3525 fields
[i
].type
= (field_type
!= NULL
)
3526 ? field_type
: glsl_type::error_type
;
3527 fields
[i
].name
= decl
->identifier
;
3532 assert(i
== decl_count
);
3534 const glsl_type
*t
=
3535 glsl_type::get_record_instance(fields
, decl_count
, this->name
);
3537 YYLTYPE loc
= this->get_location();
3538 if (!state
->symbols
->add_type(name
, t
)) {
3539 _mesa_glsl_error(& loc
, state
, "struct `%s' previously defined", name
);
3541 const glsl_type
**s
= reralloc(state
, state
->user_structures
,
3543 state
->num_user_structures
+ 1);
3545 s
[state
->num_user_structures
] = t
;
3546 state
->user_structures
= s
;
3547 state
->num_user_structures
++;
3551 /* Structure type definitions do not have r-values.