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
);
90 * If a conversion is available, convert one operand to a different type
92 * The \c from \c ir_rvalue is converted "in place".
94 * \param to Type that the operand it to be converted to
95 * \param from Operand that is being converted
96 * \param state GLSL compiler state
99 * If a conversion is possible (or unnecessary), \c true is returned.
100 * Otherwise \c false is returned.
103 apply_implicit_conversion(const glsl_type
*to
, ir_rvalue
* &from
,
104 struct _mesa_glsl_parse_state
*state
)
107 if (to
->base_type
== from
->type
->base_type
)
110 /* This conversion was added in GLSL 1.20. If the compilation mode is
111 * GLSL 1.10, the conversion is skipped.
113 if (state
->language_version
< 120)
116 /* From page 27 (page 33 of the PDF) of the GLSL 1.50 spec:
118 * "There are no implicit array or structure conversions. For
119 * example, an array of int cannot be implicitly converted to an
120 * array of float. There are no implicit conversions between
121 * signed and unsigned integers."
123 /* FINISHME: The above comment is partially a lie. There is int/uint
124 * FINISHME: conversion for immediate constants.
126 if (!to
->is_float() || !from
->type
->is_numeric())
129 /* Convert to a floating point type with the same number of components
130 * as the original type - i.e. int to float, not int to vec4.
132 to
= glsl_type::get_instance(GLSL_TYPE_FLOAT
, from
->type
->vector_elements
,
133 from
->type
->matrix_columns
);
135 switch (from
->type
->base_type
) {
137 from
= new(ctx
) ir_expression(ir_unop_i2f
, to
, from
, NULL
);
140 from
= new(ctx
) ir_expression(ir_unop_u2f
, to
, from
, NULL
);
143 from
= new(ctx
) ir_expression(ir_unop_b2f
, to
, from
, NULL
);
153 static const struct glsl_type
*
154 arithmetic_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
156 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
158 const glsl_type
*type_a
= value_a
->type
;
159 const glsl_type
*type_b
= value_b
->type
;
161 /* From GLSL 1.50 spec, page 56:
163 * "The arithmetic binary operators add (+), subtract (-),
164 * multiply (*), and divide (/) operate on integer and
165 * floating-point scalars, vectors, and matrices."
167 if (!type_a
->is_numeric() || !type_b
->is_numeric()) {
168 _mesa_glsl_error(loc
, state
,
169 "Operands to arithmetic operators must be numeric");
170 return glsl_type::error_type
;
174 /* "If one operand is floating-point based and the other is
175 * not, then the conversions from Section 4.1.10 "Implicit
176 * Conversions" are applied to the non-floating-point-based operand."
178 if (!apply_implicit_conversion(type_a
, value_b
, state
)
179 && !apply_implicit_conversion(type_b
, value_a
, state
)) {
180 _mesa_glsl_error(loc
, state
,
181 "Could not implicitly convert operands to "
182 "arithmetic operator");
183 return glsl_type::error_type
;
185 type_a
= value_a
->type
;
186 type_b
= value_b
->type
;
188 /* "If the operands are integer types, they must both be signed or
191 * From this rule and the preceeding conversion it can be inferred that
192 * both types must be GLSL_TYPE_FLOAT, or GLSL_TYPE_UINT, or GLSL_TYPE_INT.
193 * The is_numeric check above already filtered out the case where either
194 * type is not one of these, so now the base types need only be tested for
197 if (type_a
->base_type
!= type_b
->base_type
) {
198 _mesa_glsl_error(loc
, state
,
199 "base type mismatch for arithmetic operator");
200 return glsl_type::error_type
;
203 /* "All arithmetic binary operators result in the same fundamental type
204 * (signed integer, unsigned integer, or floating-point) as the
205 * operands they operate on, after operand type conversion. After
206 * conversion, the following cases are valid
208 * * The two operands are scalars. In this case the operation is
209 * applied, resulting in a scalar."
211 if (type_a
->is_scalar() && type_b
->is_scalar())
214 /* "* One operand is a scalar, and the other is a vector or matrix.
215 * In this case, the scalar operation is applied independently to each
216 * component of the vector or matrix, resulting in the same size
219 if (type_a
->is_scalar()) {
220 if (!type_b
->is_scalar())
222 } else if (type_b
->is_scalar()) {
226 /* All of the combinations of <scalar, scalar>, <vector, scalar>,
227 * <scalar, vector>, <scalar, matrix>, and <matrix, scalar> have been
230 assert(!type_a
->is_scalar());
231 assert(!type_b
->is_scalar());
233 /* "* The two operands are vectors of the same size. In this case, the
234 * operation is done component-wise resulting in the same size
237 if (type_a
->is_vector() && type_b
->is_vector()) {
238 if (type_a
== type_b
) {
241 _mesa_glsl_error(loc
, state
,
242 "vector size mismatch for arithmetic operator");
243 return glsl_type::error_type
;
247 /* All of the combinations of <scalar, scalar>, <vector, scalar>,
248 * <scalar, vector>, <scalar, matrix>, <matrix, scalar>, and
249 * <vector, vector> have been handled. At least one of the operands must
250 * be matrix. Further, since there are no integer matrix types, the base
251 * type of both operands must be float.
253 assert(type_a
->is_matrix() || type_b
->is_matrix());
254 assert(type_a
->base_type
== GLSL_TYPE_FLOAT
);
255 assert(type_b
->base_type
== GLSL_TYPE_FLOAT
);
257 /* "* The operator is add (+), subtract (-), or divide (/), and the
258 * operands are matrices with the same number of rows and the same
259 * number of columns. In this case, the operation is done component-
260 * wise resulting in the same size matrix."
261 * * The operator is multiply (*), where both operands are matrices or
262 * one operand is a vector and the other a matrix. A right vector
263 * operand is treated as a column vector and a left vector operand as a
264 * row vector. In all these cases, it is required that the number of
265 * columns of the left operand is equal to the number of rows of the
266 * right operand. Then, the multiply (*) operation does a linear
267 * algebraic multiply, yielding an object that has the same number of
268 * rows as the left operand and the same number of columns as the right
269 * operand. Section 5.10 "Vector and Matrix Operations" explains in
270 * more detail how vectors and matrices are operated on."
273 if (type_a
== type_b
)
276 if (type_a
->is_matrix() && type_b
->is_matrix()) {
277 /* Matrix multiply. The columns of A must match the rows of B. Given
278 * the other previously tested constraints, this means the vector type
279 * of a row from A must be the same as the vector type of a column from
282 if (type_a
->row_type() == type_b
->column_type()) {
283 /* The resulting matrix has the number of columns of matrix B and
284 * the number of rows of matrix A. We get the row count of A by
285 * looking at the size of a vector that makes up a column. The
286 * transpose (size of a row) is done for B.
288 const glsl_type
*const type
=
289 glsl_type::get_instance(type_a
->base_type
,
290 type_a
->column_type()->vector_elements
,
291 type_b
->row_type()->vector_elements
);
292 assert(type
!= glsl_type::error_type
);
296 } else if (type_a
->is_matrix()) {
297 /* A is a matrix and B is a column vector. Columns of A must match
298 * rows of B. Given the other previously tested constraints, this
299 * means the vector type of a row from A must be the same as the
300 * vector the type of B.
302 if (type_a
->row_type() == type_b
) {
303 /* The resulting vector has a number of elements equal to
304 * the number of rows of matrix A. */
305 const glsl_type
*const type
=
306 glsl_type::get_instance(type_a
->base_type
,
307 type_a
->column_type()->vector_elements
,
309 assert(type
!= glsl_type::error_type
);
314 assert(type_b
->is_matrix());
316 /* A is a row vector and B is a matrix. Columns of A must match rows
317 * of B. Given the other previously tested constraints, this means
318 * the type of A must be the same as the vector type of a column from
321 if (type_a
== type_b
->column_type()) {
322 /* The resulting vector has a number of elements equal to
323 * the number of columns of matrix B. */
324 const glsl_type
*const type
=
325 glsl_type::get_instance(type_a
->base_type
,
326 type_b
->row_type()->vector_elements
,
328 assert(type
!= glsl_type::error_type
);
334 _mesa_glsl_error(loc
, state
, "size mismatch for matrix multiplication");
335 return glsl_type::error_type
;
339 /* "All other cases are illegal."
341 _mesa_glsl_error(loc
, state
, "type mismatch");
342 return glsl_type::error_type
;
346 static const struct glsl_type
*
347 unary_arithmetic_result_type(const struct glsl_type
*type
,
348 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
350 /* From GLSL 1.50 spec, page 57:
352 * "The arithmetic unary operators negate (-), post- and pre-increment
353 * and decrement (-- and ++) operate on integer or floating-point
354 * values (including vectors and matrices). All unary operators work
355 * component-wise on their operands. These result with the same type
358 if (!type
->is_numeric()) {
359 _mesa_glsl_error(loc
, state
,
360 "Operands to arithmetic operators must be numeric");
361 return glsl_type::error_type
;
368 * \brief Return the result type of a bit-logic operation.
370 * If the given types to the bit-logic operator are invalid, return
371 * glsl_type::error_type.
373 * \param type_a Type of LHS of bit-logic op
374 * \param type_b Type of RHS of bit-logic op
376 static const struct glsl_type
*
377 bit_logic_result_type(const struct glsl_type
*type_a
,
378 const struct glsl_type
*type_b
,
380 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
382 if (state
->language_version
< 130) {
383 _mesa_glsl_error(loc
, state
, "bit operations require GLSL 1.30");
384 return glsl_type::error_type
;
387 /* From page 50 (page 56 of PDF) of GLSL 1.30 spec:
389 * "The bitwise operators and (&), exclusive-or (^), and inclusive-or
390 * (|). The operands must be of type signed or unsigned integers or
393 if (!type_a
->is_integer()) {
394 _mesa_glsl_error(loc
, state
, "LHS of `%s' must be an integer",
395 ast_expression::operator_string(op
));
396 return glsl_type::error_type
;
398 if (!type_b
->is_integer()) {
399 _mesa_glsl_error(loc
, state
, "RHS of `%s' must be an integer",
400 ast_expression::operator_string(op
));
401 return glsl_type::error_type
;
404 /* "The fundamental types of the operands (signed or unsigned) must
407 if (type_a
->base_type
!= type_b
->base_type
) {
408 _mesa_glsl_error(loc
, state
, "operands of `%s' must have the same "
409 "base type", ast_expression::operator_string(op
));
410 return glsl_type::error_type
;
413 /* "The operands cannot be vectors of differing size." */
414 if (type_a
->is_vector() &&
415 type_b
->is_vector() &&
416 type_a
->vector_elements
!= type_b
->vector_elements
) {
417 _mesa_glsl_error(loc
, state
, "operands of `%s' cannot be vectors of "
418 "different sizes", ast_expression::operator_string(op
));
419 return glsl_type::error_type
;
422 /* "If one operand is a scalar and the other a vector, the scalar is
423 * applied component-wise to the vector, resulting in the same type as
424 * the vector. The fundamental types of the operands [...] will be the
425 * resulting fundamental type."
427 if (type_a
->is_scalar())
433 static const struct glsl_type
*
434 modulus_result_type(const struct glsl_type
*type_a
,
435 const struct glsl_type
*type_b
,
436 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
438 /* From GLSL 1.50 spec, page 56:
439 * "The operator modulus (%) operates on signed or unsigned integers or
440 * integer vectors. The operand types must both be signed or both be
443 if (!type_a
->is_integer() || !type_b
->is_integer()
444 || (type_a
->base_type
!= type_b
->base_type
)) {
445 _mesa_glsl_error(loc
, state
, "type mismatch");
446 return glsl_type::error_type
;
449 /* "The operands cannot be vectors of differing size. If one operand is
450 * a scalar and the other vector, then the scalar is applied component-
451 * wise to the vector, resulting in the same type as the vector. If both
452 * are vectors of the same size, the result is computed component-wise."
454 if (type_a
->is_vector()) {
455 if (!type_b
->is_vector()
456 || (type_a
->vector_elements
== type_b
->vector_elements
))
461 /* "The operator modulus (%) is not defined for any other data types
462 * (non-integer types)."
464 _mesa_glsl_error(loc
, state
, "type mismatch");
465 return glsl_type::error_type
;
469 static const struct glsl_type
*
470 relational_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
471 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
473 const glsl_type
*type_a
= value_a
->type
;
474 const glsl_type
*type_b
= value_b
->type
;
476 /* From GLSL 1.50 spec, page 56:
477 * "The relational operators greater than (>), less than (<), greater
478 * than or equal (>=), and less than or equal (<=) operate only on
479 * scalar integer and scalar floating-point expressions."
481 if (!type_a
->is_numeric()
482 || !type_b
->is_numeric()
483 || !type_a
->is_scalar()
484 || !type_b
->is_scalar()) {
485 _mesa_glsl_error(loc
, state
,
486 "Operands to relational operators must be scalar and "
488 return glsl_type::error_type
;
491 /* "Either the operands' types must match, or the conversions from
492 * Section 4.1.10 "Implicit Conversions" will be applied to the integer
493 * operand, after which the types must match."
495 if (!apply_implicit_conversion(type_a
, value_b
, state
)
496 && !apply_implicit_conversion(type_b
, value_a
, state
)) {
497 _mesa_glsl_error(loc
, state
,
498 "Could not implicitly convert operands to "
499 "relational operator");
500 return glsl_type::error_type
;
502 type_a
= value_a
->type
;
503 type_b
= value_b
->type
;
505 if (type_a
->base_type
!= type_b
->base_type
) {
506 _mesa_glsl_error(loc
, state
, "base type mismatch");
507 return glsl_type::error_type
;
510 /* "The result is scalar Boolean."
512 return glsl_type::bool_type
;
516 * \brief Return the result type of a bit-shift operation.
518 * If the given types to the bit-shift operator are invalid, return
519 * glsl_type::error_type.
521 * \param type_a Type of LHS of bit-shift op
522 * \param type_b Type of RHS of bit-shift op
524 static const struct glsl_type
*
525 shift_result_type(const struct glsl_type
*type_a
,
526 const struct glsl_type
*type_b
,
528 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
530 if (state
->language_version
< 130) {
531 _mesa_glsl_error(loc
, state
, "bit operations require GLSL 1.30");
532 return glsl_type::error_type
;
535 /* From page 50 (page 56 of the PDF) of the GLSL 1.30 spec:
537 * "The shift operators (<<) and (>>). For both operators, the operands
538 * must be signed or unsigned integers or integer vectors. One operand
539 * can be signed while the other is unsigned."
541 if (!type_a
->is_integer()) {
542 _mesa_glsl_error(loc
, state
, "LHS of operator %s must be an integer or "
543 "integer vector", ast_expression::operator_string(op
));
544 return glsl_type::error_type
;
547 if (!type_b
->is_integer()) {
548 _mesa_glsl_error(loc
, state
, "RHS of operator %s must be an integer or "
549 "integer vector", ast_expression::operator_string(op
));
550 return glsl_type::error_type
;
553 /* "If the first operand is a scalar, the second operand has to be
556 if (type_a
->is_scalar() && !type_b
->is_scalar()) {
557 _mesa_glsl_error(loc
, state
, "If the first operand of %s is scalar, the "
558 "second must be scalar as well",
559 ast_expression::operator_string(op
));
560 return glsl_type::error_type
;
563 /* If both operands are vectors, check that they have same number of
566 if (type_a
->is_vector() &&
567 type_b
->is_vector() &&
568 type_a
->vector_elements
!= type_b
->vector_elements
) {
569 _mesa_glsl_error(loc
, state
, "Vector operands to operator %s must "
570 "have same number of elements",
571 ast_expression::operator_string(op
));
572 return glsl_type::error_type
;
575 /* "In all cases, the resulting type will be the same type as the left
582 * Validates that a value can be assigned to a location with a specified type
584 * Validates that \c rhs can be assigned to some location. If the types are
585 * not an exact match but an automatic conversion is possible, \c rhs will be
589 * \c NULL if \c rhs cannot be assigned to a location with type \c lhs_type.
590 * Otherwise the actual RHS to be assigned will be returned. This may be
591 * \c rhs, or it may be \c rhs after some type conversion.
594 * In addition to being used for assignments, this function is used to
595 * type-check return values.
598 validate_assignment(struct _mesa_glsl_parse_state
*state
,
599 const glsl_type
*lhs_type
, ir_rvalue
*rhs
)
601 /* If there is already some error in the RHS, just return it. Anything
602 * else will lead to an avalanche of error message back to the user.
604 if (rhs
->type
->is_error())
607 /* If the types are identical, the assignment can trivially proceed.
609 if (rhs
->type
== lhs_type
)
612 /* If the array element types are the same and the size of the LHS is zero,
613 * the assignment is okay.
615 * Note: Whole-array assignments are not permitted in GLSL 1.10, but this
616 * is handled by ir_dereference::is_lvalue.
618 if (lhs_type
->is_array() && rhs
->type
->is_array()
619 && (lhs_type
->element_type() == rhs
->type
->element_type())
620 && (lhs_type
->array_size() == 0)) {
624 /* Check for implicit conversion in GLSL 1.20 */
625 if (apply_implicit_conversion(lhs_type
, rhs
, state
)) {
626 if (rhs
->type
== lhs_type
)
634 do_assignment(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
,
635 ir_rvalue
*lhs
, ir_rvalue
*rhs
,
639 bool error_emitted
= (lhs
->type
->is_error() || rhs
->type
->is_error());
641 if (!error_emitted
) {
642 if (lhs
->variable_referenced() != NULL
643 && lhs
->variable_referenced()->read_only
) {
644 _mesa_glsl_error(&lhs_loc
, state
,
645 "assignment to read-only variable '%s'",
646 lhs
->variable_referenced()->name
);
647 error_emitted
= true;
649 } else if (!lhs
->is_lvalue()) {
650 _mesa_glsl_error(& lhs_loc
, state
, "non-lvalue in assignment");
651 error_emitted
= true;
654 if (state
->es_shader
&& lhs
->type
->is_array()) {
655 _mesa_glsl_error(&lhs_loc
, state
, "whole array assignment is not "
656 "allowed in GLSL ES 1.00.");
657 error_emitted
= true;
661 ir_rvalue
*new_rhs
= validate_assignment(state
, lhs
->type
, rhs
);
662 if (new_rhs
== NULL
) {
663 _mesa_glsl_error(& lhs_loc
, state
, "type mismatch");
667 /* If the LHS array was not declared with a size, it takes it size from
668 * the RHS. If the LHS is an l-value and a whole array, it must be a
669 * dereference of a variable. Any other case would require that the LHS
670 * is either not an l-value or not a whole array.
672 if (lhs
->type
->array_size() == 0) {
673 ir_dereference
*const d
= lhs
->as_dereference();
677 ir_variable
*const var
= d
->variable_referenced();
681 if (var
->max_array_access
>= unsigned(rhs
->type
->array_size())) {
682 /* FINISHME: This should actually log the location of the RHS. */
683 _mesa_glsl_error(& lhs_loc
, state
, "array size must be > %u due to "
685 var
->max_array_access
);
688 var
->type
= glsl_type::get_array_instance(lhs
->type
->element_type(),
689 rhs
->type
->array_size());
694 /* Most callers of do_assignment (assign, add_assign, pre_inc/dec,
695 * but not post_inc) need the converted assigned value as an rvalue
696 * to handle things like:
700 * So we always just store the computed value being assigned to a
701 * temporary and return a deref of that temporary. If the rvalue
702 * ends up not being used, the temp will get copy-propagated out.
704 ir_variable
*var
= new(ctx
) ir_variable(rhs
->type
, "assignment_tmp",
706 ir_dereference_variable
*deref_var
= new(ctx
) ir_dereference_variable(var
);
707 instructions
->push_tail(var
);
708 instructions
->push_tail(new(ctx
) ir_assignment(deref_var
,
711 deref_var
= new(ctx
) ir_dereference_variable(var
);
714 instructions
->push_tail(new(ctx
) ir_assignment(lhs
, deref_var
, NULL
));
716 return new(ctx
) ir_dereference_variable(var
);
720 get_lvalue_copy(exec_list
*instructions
, ir_rvalue
*lvalue
)
722 void *ctx
= talloc_parent(lvalue
);
725 var
= new(ctx
) ir_variable(lvalue
->type
, "_post_incdec_tmp",
727 instructions
->push_tail(var
);
728 var
->mode
= ir_var_auto
;
730 instructions
->push_tail(new(ctx
) ir_assignment(new(ctx
) ir_dereference_variable(var
),
733 /* Once we've created this temporary, mark it read only so it's no
734 * longer considered an lvalue.
736 var
->read_only
= true;
738 return new(ctx
) ir_dereference_variable(var
);
743 ast_node::hir(exec_list
*instructions
,
744 struct _mesa_glsl_parse_state
*state
)
753 mark_whole_array_access(ir_rvalue
*access
)
755 ir_dereference_variable
*deref
= access
->as_dereference_variable();
758 deref
->var
->max_array_access
= deref
->type
->length
- 1;
763 do_comparison(void *mem_ctx
, int operation
, ir_rvalue
*op0
, ir_rvalue
*op1
)
766 ir_rvalue
*cmp
= NULL
;
768 if (operation
== ir_binop_all_equal
)
769 join_op
= ir_binop_logic_and
;
771 join_op
= ir_binop_logic_or
;
773 switch (op0
->type
->base_type
) {
774 case GLSL_TYPE_FLOAT
:
778 return new(mem_ctx
) ir_expression(operation
, op0
, op1
);
780 case GLSL_TYPE_ARRAY
: {
781 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
782 ir_rvalue
*e0
, *e1
, *result
;
784 e0
= new(mem_ctx
) ir_dereference_array(op0
->clone(mem_ctx
, NULL
),
785 new(mem_ctx
) ir_constant(i
));
786 e1
= new(mem_ctx
) ir_dereference_array(op1
->clone(mem_ctx
, NULL
),
787 new(mem_ctx
) ir_constant(i
));
788 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
791 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
797 mark_whole_array_access(op0
);
798 mark_whole_array_access(op1
);
802 case GLSL_TYPE_STRUCT
: {
803 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
804 ir_rvalue
*e0
, *e1
, *result
;
805 const char *field_name
= op0
->type
->fields
.structure
[i
].name
;
807 e0
= new(mem_ctx
) ir_dereference_record(op0
->clone(mem_ctx
, NULL
),
809 e1
= new(mem_ctx
) ir_dereference_record(op1
->clone(mem_ctx
, NULL
),
811 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
814 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
822 case GLSL_TYPE_ERROR
:
824 case GLSL_TYPE_SAMPLER
:
825 /* I assume a comparison of a struct containing a sampler just
826 * ignores the sampler present in the type.
831 assert(!"Should not get here.");
836 cmp
= new(mem_ctx
) ir_constant(true);
842 ast_expression::hir(exec_list
*instructions
,
843 struct _mesa_glsl_parse_state
*state
)
846 static const int operations
[AST_NUM_OPERATORS
] = {
847 -1, /* ast_assign doesn't convert to ir_expression. */
848 -1, /* ast_plus doesn't convert to ir_expression. */
872 /* Note: The following block of expression types actually convert
873 * to multiple IR instructions.
875 ir_binop_mul
, /* ast_mul_assign */
876 ir_binop_div
, /* ast_div_assign */
877 ir_binop_mod
, /* ast_mod_assign */
878 ir_binop_add
, /* ast_add_assign */
879 ir_binop_sub
, /* ast_sub_assign */
880 ir_binop_lshift
, /* ast_ls_assign */
881 ir_binop_rshift
, /* ast_rs_assign */
882 ir_binop_bit_and
, /* ast_and_assign */
883 ir_binop_bit_xor
, /* ast_xor_assign */
884 ir_binop_bit_or
, /* ast_or_assign */
886 -1, /* ast_conditional doesn't convert to ir_expression. */
887 ir_binop_add
, /* ast_pre_inc. */
888 ir_binop_sub
, /* ast_pre_dec. */
889 ir_binop_add
, /* ast_post_inc. */
890 ir_binop_sub
, /* ast_post_dec. */
891 -1, /* ast_field_selection doesn't conv to ir_expression. */
892 -1, /* ast_array_index doesn't convert to ir_expression. */
893 -1, /* ast_function_call doesn't conv to ir_expression. */
894 -1, /* ast_identifier doesn't convert to ir_expression. */
895 -1, /* ast_int_constant doesn't convert to ir_expression. */
896 -1, /* ast_uint_constant doesn't conv to ir_expression. */
897 -1, /* ast_float_constant doesn't conv to ir_expression. */
898 -1, /* ast_bool_constant doesn't conv to ir_expression. */
899 -1, /* ast_sequence doesn't convert to ir_expression. */
901 ir_rvalue
*result
= NULL
;
903 const struct glsl_type
*type
= glsl_type::error_type
;
904 bool error_emitted
= false;
907 loc
= this->get_location();
909 switch (this->oper
) {
911 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
912 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
914 result
= do_assignment(instructions
, state
, op
[0], op
[1],
915 this->subexpressions
[0]->get_location());
916 error_emitted
= result
->type
->is_error();
922 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
924 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
926 error_emitted
= type
->is_error();
932 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
934 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
936 error_emitted
= type
->is_error();
938 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
946 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
947 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
949 type
= arithmetic_result_type(op
[0], op
[1],
950 (this->oper
== ast_mul
),
952 error_emitted
= type
->is_error();
954 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
959 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
960 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
962 type
= modulus_result_type(op
[0]->type
, op
[1]->type
, state
, & loc
);
964 assert(operations
[this->oper
] == ir_binop_mod
);
966 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
968 error_emitted
= type
->is_error();
973 if (state
->language_version
< 130) {
974 _mesa_glsl_error(&loc
, state
, "operator %s requires GLSL 1.30",
975 operator_string(this->oper
));
976 error_emitted
= true;
979 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
980 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
981 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
983 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
985 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
992 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
993 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
995 type
= relational_result_type(op
[0], op
[1], state
, & loc
);
997 /* The relational operators must either generate an error or result
998 * in a scalar boolean. See page 57 of the GLSL 1.50 spec.
1000 assert(type
->is_error()
1001 || ((type
->base_type
== GLSL_TYPE_BOOL
)
1002 && type
->is_scalar()));
1004 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1006 error_emitted
= type
->is_error();
1011 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1012 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1014 /* From page 58 (page 64 of the PDF) of the GLSL 1.50 spec:
1016 * "The equality operators equal (==), and not equal (!=)
1017 * operate on all types. They result in a scalar Boolean. If
1018 * the operand types do not match, then there must be a
1019 * conversion from Section 4.1.10 "Implicit Conversions"
1020 * applied to one operand that can make them match, in which
1021 * case this conversion is done."
1023 if ((!apply_implicit_conversion(op
[0]->type
, op
[1], state
)
1024 && !apply_implicit_conversion(op
[1]->type
, op
[0], state
))
1025 || (op
[0]->type
!= op
[1]->type
)) {
1026 _mesa_glsl_error(& loc
, state
, "operands of `%s' must have the same "
1027 "type", (this->oper
== ast_equal
) ? "==" : "!=");
1028 error_emitted
= true;
1029 } else if ((state
->language_version
<= 110)
1030 && (op
[0]->type
->is_array() || op
[1]->type
->is_array())) {
1031 _mesa_glsl_error(& loc
, state
, "array comparisons forbidden in "
1033 error_emitted
= true;
1036 result
= do_comparison(ctx
, operations
[this->oper
], op
[0], op
[1]);
1037 type
= glsl_type::bool_type
;
1039 assert(error_emitted
|| (result
->type
== glsl_type::bool_type
));
1045 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1046 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1047 type
= bit_logic_result_type(op
[0]->type
, op
[1]->type
, this->oper
,
1049 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1051 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1055 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1057 if (state
->language_version
< 130) {
1058 _mesa_glsl_error(&loc
, state
, "bit-wise operations require GLSL 1.30");
1059 error_emitted
= true;
1062 if (!op
[0]->type
->is_integer()) {
1063 _mesa_glsl_error(&loc
, state
, "operand of `~' must be an integer");
1064 error_emitted
= true;
1068 result
= new(ctx
) ir_expression(ir_unop_bit_not
, type
, op
[0], NULL
);
1071 case ast_logic_and
: {
1072 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1074 if (!op
[0]->type
->is_boolean() || !op
[0]->type
->is_scalar()) {
1075 YYLTYPE loc
= this->subexpressions
[0]->get_location();
1077 _mesa_glsl_error(& loc
, state
, "LHS of `%s' must be scalar boolean",
1078 operator_string(this->oper
));
1079 error_emitted
= true;
1082 ir_constant
*op0_const
= op
[0]->constant_expression_value();
1084 if (op0_const
->value
.b
[0]) {
1085 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1087 if (!op
[1]->type
->is_boolean() || !op
[1]->type
->is_scalar()) {
1088 YYLTYPE loc
= this->subexpressions
[1]->get_location();
1090 _mesa_glsl_error(& loc
, state
,
1091 "RHS of `%s' must be scalar boolean",
1092 operator_string(this->oper
));
1093 error_emitted
= true;
1099 type
= glsl_type::bool_type
;
1101 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1104 instructions
->push_tail(tmp
);
1106 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1107 instructions
->push_tail(stmt
);
1109 op
[1] = this->subexpressions
[1]->hir(&stmt
->then_instructions
, state
);
1111 if (!op
[1]->type
->is_boolean() || !op
[1]->type
->is_scalar()) {
1112 YYLTYPE loc
= this->subexpressions
[1]->get_location();
1114 _mesa_glsl_error(& loc
, state
,
1115 "RHS of `%s' must be scalar boolean",
1116 operator_string(this->oper
));
1117 error_emitted
= true;
1120 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1121 ir_assignment
*const then_assign
=
1122 new(ctx
) ir_assignment(then_deref
, op
[1], NULL
);
1123 stmt
->then_instructions
.push_tail(then_assign
);
1125 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1126 ir_assignment
*const else_assign
=
1127 new(ctx
) ir_assignment(else_deref
, new(ctx
) ir_constant(false), NULL
);
1128 stmt
->else_instructions
.push_tail(else_assign
);
1130 result
= new(ctx
) ir_dereference_variable(tmp
);
1136 case ast_logic_or
: {
1137 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1139 if (!op
[0]->type
->is_boolean() || !op
[0]->type
->is_scalar()) {
1140 YYLTYPE loc
= this->subexpressions
[0]->get_location();
1142 _mesa_glsl_error(& loc
, state
, "LHS of `%s' must be scalar boolean",
1143 operator_string(this->oper
));
1144 error_emitted
= true;
1147 ir_constant
*op0_const
= op
[0]->constant_expression_value();
1149 if (op0_const
->value
.b
[0]) {
1152 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1154 if (!op
[1]->type
->is_boolean() || !op
[1]->type
->is_scalar()) {
1155 YYLTYPE loc
= this->subexpressions
[1]->get_location();
1157 _mesa_glsl_error(& loc
, state
,
1158 "RHS of `%s' must be scalar boolean",
1159 operator_string(this->oper
));
1160 error_emitted
= true;
1164 type
= glsl_type::bool_type
;
1166 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1169 instructions
->push_tail(tmp
);
1171 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1172 instructions
->push_tail(stmt
);
1174 op
[1] = this->subexpressions
[1]->hir(&stmt
->else_instructions
, state
);
1176 if (!op
[1]->type
->is_boolean() || !op
[1]->type
->is_scalar()) {
1177 YYLTYPE loc
= this->subexpressions
[1]->get_location();
1179 _mesa_glsl_error(& loc
, state
, "RHS of `%s' must be scalar boolean",
1180 operator_string(this->oper
));
1181 error_emitted
= true;
1184 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1185 ir_assignment
*const then_assign
=
1186 new(ctx
) ir_assignment(then_deref
, new(ctx
) ir_constant(true), NULL
);
1187 stmt
->then_instructions
.push_tail(then_assign
);
1189 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1190 ir_assignment
*const else_assign
=
1191 new(ctx
) ir_assignment(else_deref
, op
[1], NULL
);
1192 stmt
->else_instructions
.push_tail(else_assign
);
1194 result
= new(ctx
) ir_dereference_variable(tmp
);
1201 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1202 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1205 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1207 type
= glsl_type::bool_type
;
1211 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1213 if (!op
[0]->type
->is_boolean() || !op
[0]->type
->is_scalar()) {
1214 YYLTYPE loc
= this->subexpressions
[0]->get_location();
1216 _mesa_glsl_error(& loc
, state
,
1217 "operand of `!' must be scalar boolean");
1218 error_emitted
= true;
1221 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1223 type
= glsl_type::bool_type
;
1226 case ast_mul_assign
:
1227 case ast_div_assign
:
1228 case ast_add_assign
:
1229 case ast_sub_assign
: {
1230 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1231 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1233 type
= arithmetic_result_type(op
[0], op
[1],
1234 (this->oper
== ast_mul_assign
),
1237 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1240 result
= do_assignment(instructions
, state
,
1241 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1242 this->subexpressions
[0]->get_location());
1243 type
= result
->type
;
1244 error_emitted
= (op
[0]->type
->is_error());
1246 /* GLSL 1.10 does not allow array assignment. However, we don't have to
1247 * explicitly test for this because none of the binary expression
1248 * operators allow array operands either.
1254 case ast_mod_assign
: {
1255 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1256 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1258 type
= modulus_result_type(op
[0]->type
, op
[1]->type
, state
, & loc
);
1260 assert(operations
[this->oper
] == ir_binop_mod
);
1262 ir_rvalue
*temp_rhs
;
1263 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1266 result
= do_assignment(instructions
, state
,
1267 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1268 this->subexpressions
[0]->get_location());
1269 type
= result
->type
;
1270 error_emitted
= type
->is_error();
1275 case ast_rs_assign
: {
1276 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1277 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1278 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1280 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1281 type
, op
[0], op
[1]);
1282 result
= do_assignment(instructions
, state
, op
[0]->clone(ctx
, NULL
),
1284 this->subexpressions
[0]->get_location());
1285 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1289 case ast_and_assign
:
1290 case ast_xor_assign
:
1291 case ast_or_assign
: {
1292 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1293 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1294 type
= bit_logic_result_type(op
[0]->type
, op
[1]->type
, this->oper
,
1296 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1297 type
, op
[0], op
[1]);
1298 result
= do_assignment(instructions
, state
, op
[0]->clone(ctx
, NULL
),
1300 this->subexpressions
[0]->get_location());
1301 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1305 case ast_conditional
: {
1306 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1308 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1310 * "The ternary selection operator (?:). It operates on three
1311 * expressions (exp1 ? exp2 : exp3). This operator evaluates the
1312 * first expression, which must result in a scalar Boolean."
1314 if (!op
[0]->type
->is_boolean() || !op
[0]->type
->is_scalar()) {
1315 YYLTYPE loc
= this->subexpressions
[0]->get_location();
1317 _mesa_glsl_error(& loc
, state
, "?: condition must be scalar boolean");
1318 error_emitted
= true;
1321 /* The :? operator is implemented by generating an anonymous temporary
1322 * followed by an if-statement. The last instruction in each branch of
1323 * the if-statement assigns a value to the anonymous temporary. This
1324 * temporary is the r-value of the expression.
1326 exec_list then_instructions
;
1327 exec_list else_instructions
;
1329 op
[1] = this->subexpressions
[1]->hir(&then_instructions
, state
);
1330 op
[2] = this->subexpressions
[2]->hir(&else_instructions
, state
);
1332 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1334 * "The second and third expressions can be any type, as
1335 * long their types match, or there is a conversion in
1336 * Section 4.1.10 "Implicit Conversions" that can be applied
1337 * to one of the expressions to make their types match. This
1338 * resulting matching type is the type of the entire
1341 if ((!apply_implicit_conversion(op
[1]->type
, op
[2], state
)
1342 && !apply_implicit_conversion(op
[2]->type
, op
[1], state
))
1343 || (op
[1]->type
!= op
[2]->type
)) {
1344 YYLTYPE loc
= this->subexpressions
[1]->get_location();
1346 _mesa_glsl_error(& loc
, state
, "Second and third operands of ?: "
1347 "operator must have matching types.");
1348 error_emitted
= true;
1349 type
= glsl_type::error_type
;
1354 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1356 * "The second and third expressions must be the same type, but can
1357 * be of any type other than an array."
1359 if ((state
->language_version
<= 110) && type
->is_array()) {
1360 _mesa_glsl_error(& loc
, state
, "Second and third operands of ?: "
1361 "operator must not be arrays.");
1362 error_emitted
= true;
1365 ir_constant
*cond_val
= op
[0]->constant_expression_value();
1366 ir_constant
*then_val
= op
[1]->constant_expression_value();
1367 ir_constant
*else_val
= op
[2]->constant_expression_value();
1369 if (then_instructions
.is_empty()
1370 && else_instructions
.is_empty()
1371 && (cond_val
!= NULL
) && (then_val
!= NULL
) && (else_val
!= NULL
)) {
1372 result
= (cond_val
->value
.b
[0]) ? then_val
: else_val
;
1374 ir_variable
*const tmp
=
1375 new(ctx
) ir_variable(type
, "conditional_tmp", ir_var_temporary
);
1376 instructions
->push_tail(tmp
);
1378 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1379 instructions
->push_tail(stmt
);
1381 then_instructions
.move_nodes_to(& stmt
->then_instructions
);
1382 ir_dereference
*const then_deref
=
1383 new(ctx
) ir_dereference_variable(tmp
);
1384 ir_assignment
*const then_assign
=
1385 new(ctx
) ir_assignment(then_deref
, op
[1], NULL
);
1386 stmt
->then_instructions
.push_tail(then_assign
);
1388 else_instructions
.move_nodes_to(& stmt
->else_instructions
);
1389 ir_dereference
*const else_deref
=
1390 new(ctx
) ir_dereference_variable(tmp
);
1391 ir_assignment
*const else_assign
=
1392 new(ctx
) ir_assignment(else_deref
, op
[2], NULL
);
1393 stmt
->else_instructions
.push_tail(else_assign
);
1395 result
= new(ctx
) ir_dereference_variable(tmp
);
1402 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1403 if (op
[0]->type
->base_type
== GLSL_TYPE_FLOAT
)
1404 op
[1] = new(ctx
) ir_constant(1.0f
);
1406 op
[1] = new(ctx
) ir_constant(1);
1408 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1410 ir_rvalue
*temp_rhs
;
1411 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1414 result
= do_assignment(instructions
, state
,
1415 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1416 this->subexpressions
[0]->get_location());
1417 type
= result
->type
;
1418 error_emitted
= op
[0]->type
->is_error();
1423 case ast_post_dec
: {
1424 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1425 if (op
[0]->type
->base_type
== GLSL_TYPE_FLOAT
)
1426 op
[1] = new(ctx
) ir_constant(1.0f
);
1428 op
[1] = new(ctx
) ir_constant(1);
1430 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1432 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1434 ir_rvalue
*temp_rhs
;
1435 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1438 /* Get a temporary of a copy of the lvalue before it's modified.
1439 * This may get thrown away later.
1441 result
= get_lvalue_copy(instructions
, op
[0]->clone(ctx
, NULL
));
1443 (void)do_assignment(instructions
, state
,
1444 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1445 this->subexpressions
[0]->get_location());
1447 type
= result
->type
;
1448 error_emitted
= op
[0]->type
->is_error();
1452 case ast_field_selection
:
1453 result
= _mesa_ast_field_selection_to_hir(this, instructions
, state
);
1454 type
= result
->type
;
1457 case ast_array_index
: {
1458 YYLTYPE index_loc
= subexpressions
[1]->get_location();
1460 op
[0] = subexpressions
[0]->hir(instructions
, state
);
1461 op
[1] = subexpressions
[1]->hir(instructions
, state
);
1463 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1465 ir_rvalue
*const array
= op
[0];
1467 result
= new(ctx
) ir_dereference_array(op
[0], op
[1]);
1469 /* Do not use op[0] after this point. Use array.
1477 if (!array
->type
->is_array()
1478 && !array
->type
->is_matrix()
1479 && !array
->type
->is_vector()) {
1480 _mesa_glsl_error(& index_loc
, state
,
1481 "cannot dereference non-array / non-matrix / "
1483 error_emitted
= true;
1486 if (!op
[1]->type
->is_integer()) {
1487 _mesa_glsl_error(& index_loc
, state
,
1488 "array index must be integer type");
1489 error_emitted
= true;
1490 } else if (!op
[1]->type
->is_scalar()) {
1491 _mesa_glsl_error(& index_loc
, state
,
1492 "array index must be scalar");
1493 error_emitted
= true;
1496 /* If the array index is a constant expression and the array has a
1497 * declared size, ensure that the access is in-bounds. If the array
1498 * index is not a constant expression, ensure that the array has a
1501 ir_constant
*const const_index
= op
[1]->constant_expression_value();
1502 if (const_index
!= NULL
) {
1503 const int idx
= const_index
->value
.i
[0];
1504 const char *type_name
;
1507 if (array
->type
->is_matrix()) {
1508 type_name
= "matrix";
1509 } else if (array
->type
->is_vector()) {
1510 type_name
= "vector";
1512 type_name
= "array";
1515 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec:
1517 * "It is illegal to declare an array with a size, and then
1518 * later (in the same shader) index the same array with an
1519 * integral constant expression greater than or equal to the
1520 * declared size. It is also illegal to index an array with a
1521 * negative constant expression."
1523 if (array
->type
->is_matrix()) {
1524 if (array
->type
->row_type()->vector_elements
<= idx
) {
1525 bound
= array
->type
->row_type()->vector_elements
;
1527 } else if (array
->type
->is_vector()) {
1528 if (array
->type
->vector_elements
<= idx
) {
1529 bound
= array
->type
->vector_elements
;
1532 if ((array
->type
->array_size() > 0)
1533 && (array
->type
->array_size() <= idx
)) {
1534 bound
= array
->type
->array_size();
1539 _mesa_glsl_error(& loc
, state
, "%s index must be < %u",
1541 error_emitted
= true;
1542 } else if (idx
< 0) {
1543 _mesa_glsl_error(& loc
, state
, "%s index must be >= 0",
1545 error_emitted
= true;
1548 if (array
->type
->is_array()) {
1549 /* If the array is a variable dereference, it dereferences the
1550 * whole array, by definition. Use this to get the variable.
1552 * FINISHME: Should some methods for getting / setting / testing
1553 * FINISHME: array access limits be added to ir_dereference?
1555 ir_variable
*const v
= array
->whole_variable_referenced();
1556 if ((v
!= NULL
) && (unsigned(idx
) > v
->max_array_access
))
1557 v
->max_array_access
= idx
;
1559 } else if (array
->type
->array_size() == 0) {
1560 _mesa_glsl_error(&loc
, state
, "unsized array index must be constant");
1562 if (array
->type
->is_array()) {
1563 /* whole_variable_referenced can return NULL if the array is a
1564 * member of a structure. In this case it is safe to not update
1565 * the max_array_access field because it is never used for fields
1568 ir_variable
*v
= array
->whole_variable_referenced();
1570 v
->max_array_access
= array
->type
->array_size();
1574 /* From page 23 (29 of the PDF) of the GLSL 1.30 spec:
1576 * "Samplers aggregated into arrays within a shader (using square
1577 * brackets [ ]) can only be indexed with integral constant
1578 * expressions [...]."
1580 * This restriction was added in GLSL 1.30. Shaders using earlier version
1581 * of the language should not be rejected by the compiler front-end for
1582 * using this construct. This allows useful things such as using a loop
1583 * counter as the index to an array of samplers. If the loop in unrolled,
1584 * the code should compile correctly. Instead, emit a warning.
1586 if (array
->type
->is_array() &&
1587 array
->type
->element_type()->is_sampler() &&
1588 const_index
== NULL
) {
1590 if (state
->language_version
== 100) {
1591 _mesa_glsl_warning(&loc
, state
,
1592 "sampler arrays indexed with non-constant "
1593 "expressions is optional in GLSL ES 1.00");
1594 } else if (state
->language_version
< 130) {
1595 _mesa_glsl_warning(&loc
, state
,
1596 "sampler arrays indexed with non-constant "
1597 "expressions is forbidden in GLSL 1.30 and "
1600 _mesa_glsl_error(&loc
, state
,
1601 "sampler arrays indexed with non-constant "
1602 "expressions is forbidden in GLSL 1.30 and "
1604 error_emitted
= true;
1609 result
->type
= glsl_type::error_type
;
1611 type
= result
->type
;
1615 case ast_function_call
:
1616 /* Should *NEVER* get here. ast_function_call should always be handled
1617 * by ast_function_expression::hir.
1622 case ast_identifier
: {
1623 /* ast_identifier can appear several places in a full abstract syntax
1624 * tree. This particular use must be at location specified in the grammar
1625 * as 'variable_identifier'.
1628 state
->symbols
->get_variable(this->primary_expression
.identifier
);
1630 result
= new(ctx
) ir_dereference_variable(var
);
1634 type
= result
->type
;
1636 _mesa_glsl_error(& loc
, state
, "`%s' undeclared",
1637 this->primary_expression
.identifier
);
1639 error_emitted
= true;
1644 case ast_int_constant
:
1645 type
= glsl_type::int_type
;
1646 result
= new(ctx
) ir_constant(this->primary_expression
.int_constant
);
1649 case ast_uint_constant
:
1650 type
= glsl_type::uint_type
;
1651 result
= new(ctx
) ir_constant(this->primary_expression
.uint_constant
);
1654 case ast_float_constant
:
1655 type
= glsl_type::float_type
;
1656 result
= new(ctx
) ir_constant(this->primary_expression
.float_constant
);
1659 case ast_bool_constant
:
1660 type
= glsl_type::bool_type
;
1661 result
= new(ctx
) ir_constant(bool(this->primary_expression
.bool_constant
));
1664 case ast_sequence
: {
1665 /* It should not be possible to generate a sequence in the AST without
1666 * any expressions in it.
1668 assert(!this->expressions
.is_empty());
1670 /* The r-value of a sequence is the last expression in the sequence. If
1671 * the other expressions in the sequence do not have side-effects (and
1672 * therefore add instructions to the instruction list), they get dropped
1675 foreach_list_typed (ast_node
, ast
, link
, &this->expressions
)
1676 result
= ast
->hir(instructions
, state
);
1678 type
= result
->type
;
1680 /* Any errors should have already been emitted in the loop above.
1682 error_emitted
= true;
1687 if (type
->is_error() && !error_emitted
)
1688 _mesa_glsl_error(& loc
, state
, "type mismatch");
1695 ast_expression_statement::hir(exec_list
*instructions
,
1696 struct _mesa_glsl_parse_state
*state
)
1698 /* It is possible to have expression statements that don't have an
1699 * expression. This is the solitary semicolon:
1701 * for (i = 0; i < 5; i++)
1704 * In this case the expression will be NULL. Test for NULL and don't do
1705 * anything in that case.
1707 if (expression
!= NULL
)
1708 expression
->hir(instructions
, state
);
1710 /* Statements do not have r-values.
1717 ast_compound_statement::hir(exec_list
*instructions
,
1718 struct _mesa_glsl_parse_state
*state
)
1721 state
->symbols
->push_scope();
1723 foreach_list_typed (ast_node
, ast
, link
, &this->statements
)
1724 ast
->hir(instructions
, state
);
1727 state
->symbols
->pop_scope();
1729 /* Compound statements do not have r-values.
1735 static const glsl_type
*
1736 process_array_type(YYLTYPE
*loc
, const glsl_type
*base
, ast_node
*array_size
,
1737 struct _mesa_glsl_parse_state
*state
)
1739 unsigned length
= 0;
1741 /* FINISHME: Reject delcarations of multidimensional arrays. */
1743 if (array_size
!= NULL
) {
1744 exec_list dummy_instructions
;
1745 ir_rvalue
*const ir
= array_size
->hir(& dummy_instructions
, state
);
1746 YYLTYPE loc
= array_size
->get_location();
1748 /* FINISHME: Verify that the grammar forbids side-effects in array
1749 * FINISHME: sizes. i.e., 'vec4 [x = 12] data'
1751 assert(dummy_instructions
.is_empty());
1754 if (!ir
->type
->is_integer()) {
1755 _mesa_glsl_error(& loc
, state
, "array size must be integer type");
1756 } else if (!ir
->type
->is_scalar()) {
1757 _mesa_glsl_error(& loc
, state
, "array size must be scalar type");
1759 ir_constant
*const size
= ir
->constant_expression_value();
1762 _mesa_glsl_error(& loc
, state
, "array size must be a "
1763 "constant valued expression");
1764 } else if (size
->value
.i
[0] <= 0) {
1765 _mesa_glsl_error(& loc
, state
, "array size must be > 0");
1767 assert(size
->type
== ir
->type
);
1768 length
= size
->value
.u
[0];
1772 } else if (state
->es_shader
) {
1773 /* Section 10.17 of the GLSL ES 1.00 specification states that unsized
1774 * array declarations have been removed from the language.
1776 _mesa_glsl_error(loc
, state
, "unsized array declarations are not "
1777 "allowed in GLSL ES 1.00.");
1780 return glsl_type::get_array_instance(base
, length
);
1785 ast_type_specifier::glsl_type(const char **name
,
1786 struct _mesa_glsl_parse_state
*state
) const
1788 const struct glsl_type
*type
;
1790 type
= state
->symbols
->get_type(this->type_name
);
1791 *name
= this->type_name
;
1793 if (this->is_array
) {
1794 YYLTYPE loc
= this->get_location();
1795 type
= process_array_type(&loc
, type
, this->array_size
, state
);
1803 apply_type_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
1805 struct _mesa_glsl_parse_state
*state
,
1808 if (qual
->flags
.q
.invariant
) {
1810 _mesa_glsl_error(loc
, state
,
1811 "variable `%s' may not be redeclared "
1812 "`invariant' after being used",
1819 if (qual
->flags
.q
.constant
|| qual
->flags
.q
.attribute
1820 || qual
->flags
.q
.uniform
1821 || (qual
->flags
.q
.varying
&& (state
->target
== fragment_shader
)))
1824 if (qual
->flags
.q
.centroid
)
1827 if (qual
->flags
.q
.attribute
&& state
->target
!= vertex_shader
) {
1828 var
->type
= glsl_type::error_type
;
1829 _mesa_glsl_error(loc
, state
,
1830 "`attribute' variables may not be declared in the "
1832 _mesa_glsl_shader_target_name(state
->target
));
1835 /* From page 25 (page 31 of the PDF) of the GLSL 1.10 spec:
1837 * "The varying qualifier can be used only with the data types
1838 * float, vec2, vec3, vec4, mat2, mat3, and mat4, or arrays of
1841 if (qual
->flags
.q
.varying
) {
1842 const glsl_type
*non_array_type
;
1844 if (var
->type
&& var
->type
->is_array())
1845 non_array_type
= var
->type
->fields
.array
;
1847 non_array_type
= var
->type
;
1849 if (non_array_type
&& non_array_type
->base_type
!= GLSL_TYPE_FLOAT
) {
1850 var
->type
= glsl_type::error_type
;
1851 _mesa_glsl_error(loc
, state
,
1852 "varying variables must be of base type float");
1856 /* If there is no qualifier that changes the mode of the variable, leave
1857 * the setting alone.
1859 if (qual
->flags
.q
.in
&& qual
->flags
.q
.out
)
1860 var
->mode
= ir_var_inout
;
1861 else if (qual
->flags
.q
.attribute
|| qual
->flags
.q
.in
1862 || (qual
->flags
.q
.varying
&& (state
->target
== fragment_shader
)))
1863 var
->mode
= ir_var_in
;
1864 else if (qual
->flags
.q
.out
1865 || (qual
->flags
.q
.varying
&& (state
->target
== vertex_shader
)))
1866 var
->mode
= ir_var_out
;
1867 else if (qual
->flags
.q
.uniform
)
1868 var
->mode
= ir_var_uniform
;
1870 if (state
->all_invariant
&& (state
->current_function
== NULL
)) {
1871 switch (state
->target
) {
1873 if (var
->mode
== ir_var_out
)
1874 var
->invariant
= true;
1876 case geometry_shader
:
1877 if ((var
->mode
== ir_var_in
) || (var
->mode
== ir_var_out
))
1878 var
->invariant
= true;
1880 case fragment_shader
:
1881 if (var
->mode
== ir_var_in
)
1882 var
->invariant
= true;
1887 if (qual
->flags
.q
.flat
)
1888 var
->interpolation
= ir_var_flat
;
1889 else if (qual
->flags
.q
.noperspective
)
1890 var
->interpolation
= ir_var_noperspective
;
1892 var
->interpolation
= ir_var_smooth
;
1894 var
->pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
1895 var
->origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
1896 if ((qual
->flags
.q
.origin_upper_left
|| qual
->flags
.q
.pixel_center_integer
)
1897 && (strcmp(var
->name
, "gl_FragCoord") != 0)) {
1898 const char *const qual_string
= (qual
->flags
.q
.origin_upper_left
)
1899 ? "origin_upper_left" : "pixel_center_integer";
1901 _mesa_glsl_error(loc
, state
,
1902 "layout qualifier `%s' can only be applied to "
1903 "fragment shader input `gl_FragCoord'",
1907 if (qual
->flags
.q
.explicit_location
) {
1908 const bool global_scope
= (state
->current_function
== NULL
);
1910 const char *string
= "";
1912 /* In the vertex shader only shader inputs can be given explicit
1915 * In the fragment shader only shader outputs can be given explicit
1918 switch (state
->target
) {
1920 if (!global_scope
|| (var
->mode
!= ir_var_in
)) {
1926 case geometry_shader
:
1927 _mesa_glsl_error(loc
, state
,
1928 "geometry shader variables cannot be given "
1929 "explicit locations\n");
1932 case fragment_shader
:
1933 if (!global_scope
|| (var
->mode
!= ir_var_in
)) {
1941 _mesa_glsl_error(loc
, state
,
1942 "only %s shader %s variables can be given an "
1943 "explicit location\n",
1944 _mesa_glsl_shader_target_name(state
->target
),
1947 var
->explicit_location
= true;
1949 /* This bit of silliness is needed because invalid explicit locations
1950 * are supposed to be flagged during linking. Small negative values
1951 * biased by VERT_ATTRIB_GENERIC0 or FRAG_RESULT_DATA0 could alias
1952 * built-in values (e.g., -16+VERT_ATTRIB_GENERIC0 = VERT_ATTRIB_POS).
1953 * The linker needs to be able to differentiate these cases. This
1954 * ensures that negative values stay negative.
1956 if (qual
->location
>= 0) {
1957 var
->location
= (state
->target
== vertex_shader
)
1958 ? (qual
->location
+ VERT_ATTRIB_GENERIC0
)
1959 : (qual
->location
+ FRAG_RESULT_DATA0
);
1961 var
->location
= qual
->location
;
1966 /* Does the declaration use the 'layout' keyword?
1968 const bool uses_layout
= qual
->flags
.q
.pixel_center_integer
1969 || qual
->flags
.q
.origin_upper_left
1970 || qual
->flags
.q
.explicit_location
;
1972 /* Does the declaration use the deprecated 'attribute' or 'varying'
1975 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
1976 || qual
->flags
.q
.varying
;
1978 /* Is the 'layout' keyword used with parameters that allow relaxed checking.
1979 * Many implementations of GL_ARB_fragment_coord_conventions_enable and some
1980 * implementations (only Mesa?) GL_ARB_explicit_attrib_location_enable
1981 * allowed the layout qualifier to be used with 'varying' and 'attribute'.
1982 * These extensions and all following extensions that add the 'layout'
1983 * keyword have been modified to require the use of 'in' or 'out'.
1985 * The following extension do not allow the deprecated keywords:
1987 * GL_AMD_conservative_depth
1988 * GL_ARB_gpu_shader5
1989 * GL_ARB_separate_shader_objects
1990 * GL_ARB_tesselation_shader
1991 * GL_ARB_transform_feedback3
1992 * GL_ARB_uniform_buffer_object
1994 * It is unknown whether GL_EXT_shader_image_load_store or GL_NV_gpu_shader5
1995 * allow layout with the deprecated keywords.
1997 const bool relaxed_layout_qualifier_checking
=
1998 state
->ARB_fragment_coord_conventions_enable
;
2000 if (uses_layout
&& uses_deprecated_qualifier
) {
2001 if (relaxed_layout_qualifier_checking
) {
2002 _mesa_glsl_warning(loc
, state
,
2003 "`layout' qualifier may not be used with "
2004 "`attribute' or `varying'");
2006 _mesa_glsl_error(loc
, state
,
2007 "`layout' qualifier may not be used with "
2008 "`attribute' or `varying'");
2012 /* Layout qualifiers for gl_FragDepth, which are enabled by extension
2013 * AMD_conservative_depth.
2015 int depth_layout_count
= qual
->flags
.q
.depth_any
2016 + qual
->flags
.q
.depth_greater
2017 + qual
->flags
.q
.depth_less
2018 + qual
->flags
.q
.depth_unchanged
;
2019 if (depth_layout_count
> 0
2020 && !state
->AMD_conservative_depth_enable
) {
2021 _mesa_glsl_error(loc
, state
,
2022 "extension GL_AMD_conservative_depth must be enabled "
2023 "to use depth layout qualifiers");
2024 } else if (depth_layout_count
> 0
2025 && strcmp(var
->name
, "gl_FragDepth") != 0) {
2026 _mesa_glsl_error(loc
, state
,
2027 "depth layout qualifiers can be applied only to "
2029 } else if (depth_layout_count
> 1
2030 && strcmp(var
->name
, "gl_FragDepth") == 0) {
2031 _mesa_glsl_error(loc
, state
,
2032 "at most one depth layout qualifier can be applied to "
2035 if (qual
->flags
.q
.depth_any
)
2036 var
->depth_layout
= ir_depth_layout_any
;
2037 else if (qual
->flags
.q
.depth_greater
)
2038 var
->depth_layout
= ir_depth_layout_greater
;
2039 else if (qual
->flags
.q
.depth_less
)
2040 var
->depth_layout
= ir_depth_layout_less
;
2041 else if (qual
->flags
.q
.depth_unchanged
)
2042 var
->depth_layout
= ir_depth_layout_unchanged
;
2044 var
->depth_layout
= ir_depth_layout_none
;
2046 if (var
->type
->is_array() && state
->language_version
!= 110) {
2047 var
->array_lvalue
= true;
2053 ast_declarator_list::hir(exec_list
*instructions
,
2054 struct _mesa_glsl_parse_state
*state
)
2057 const struct glsl_type
*decl_type
;
2058 const char *type_name
= NULL
;
2059 ir_rvalue
*result
= NULL
;
2060 YYLTYPE loc
= this->get_location();
2062 /* From page 46 (page 52 of the PDF) of the GLSL 1.50 spec:
2064 * "To ensure that a particular output variable is invariant, it is
2065 * necessary to use the invariant qualifier. It can either be used to
2066 * qualify a previously declared variable as being invariant
2068 * invariant gl_Position; // make existing gl_Position be invariant"
2070 * In these cases the parser will set the 'invariant' flag in the declarator
2071 * list, and the type will be NULL.
2073 if (this->invariant
) {
2074 assert(this->type
== NULL
);
2076 if (state
->current_function
!= NULL
) {
2077 _mesa_glsl_error(& loc
, state
,
2078 "All uses of `invariant' keyword must be at global "
2082 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
2083 assert(!decl
->is_array
);
2084 assert(decl
->array_size
== NULL
);
2085 assert(decl
->initializer
== NULL
);
2087 ir_variable
*const earlier
=
2088 state
->symbols
->get_variable(decl
->identifier
);
2089 if (earlier
== NULL
) {
2090 _mesa_glsl_error(& loc
, state
,
2091 "Undeclared variable `%s' cannot be marked "
2092 "invariant\n", decl
->identifier
);
2093 } else if ((state
->target
== vertex_shader
)
2094 && (earlier
->mode
!= ir_var_out
)) {
2095 _mesa_glsl_error(& loc
, state
,
2096 "`%s' cannot be marked invariant, vertex shader "
2097 "outputs only\n", decl
->identifier
);
2098 } else if ((state
->target
== fragment_shader
)
2099 && (earlier
->mode
!= ir_var_in
)) {
2100 _mesa_glsl_error(& loc
, state
,
2101 "`%s' cannot be marked invariant, fragment shader "
2102 "inputs only\n", decl
->identifier
);
2103 } else if (earlier
->used
) {
2104 _mesa_glsl_error(& loc
, state
,
2105 "variable `%s' may not be redeclared "
2106 "`invariant' after being used",
2109 earlier
->invariant
= true;
2113 /* Invariant redeclarations do not have r-values.
2118 assert(this->type
!= NULL
);
2119 assert(!this->invariant
);
2121 /* The type specifier may contain a structure definition. Process that
2122 * before any of the variable declarations.
2124 (void) this->type
->specifier
->hir(instructions
, state
);
2126 decl_type
= this->type
->specifier
->glsl_type(& type_name
, state
);
2127 if (this->declarations
.is_empty()) {
2128 /* The only valid case where the declaration list can be empty is when
2129 * the declaration is setting the default precision of a built-in type
2130 * (e.g., 'precision highp vec4;').
2133 if (decl_type
!= NULL
) {
2135 _mesa_glsl_error(& loc
, state
, "incomplete declaration");
2139 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
2140 const struct glsl_type
*var_type
;
2143 /* FINISHME: Emit a warning if a variable declaration shadows a
2144 * FINISHME: declaration at a higher scope.
2147 if ((decl_type
== NULL
) || decl_type
->is_void()) {
2148 if (type_name
!= NULL
) {
2149 _mesa_glsl_error(& loc
, state
,
2150 "invalid type `%s' in declaration of `%s'",
2151 type_name
, decl
->identifier
);
2153 _mesa_glsl_error(& loc
, state
,
2154 "invalid type in declaration of `%s'",
2160 if (decl
->is_array
) {
2161 var_type
= process_array_type(&loc
, decl_type
, decl
->array_size
,
2164 var_type
= decl_type
;
2167 var
= new(ctx
) ir_variable(var_type
, decl
->identifier
, ir_var_auto
);
2169 /* From page 22 (page 28 of the PDF) of the GLSL 1.10 specification;
2171 * "Global variables can only use the qualifiers const,
2172 * attribute, uni form, or varying. Only one may be
2175 * Local variables can only use the qualifier const."
2177 * This is relaxed in GLSL 1.30. It is also relaxed by any extension
2178 * that adds the 'layout' keyword.
2180 if ((state
->language_version
< 130)
2181 && !state
->ARB_explicit_attrib_location_enable
2182 && !state
->ARB_fragment_coord_conventions_enable
) {
2183 if (this->type
->qualifier
.flags
.q
.out
) {
2184 _mesa_glsl_error(& loc
, state
,
2185 "`out' qualifier in declaration of `%s' "
2186 "only valid for function parameters in %s.",
2187 decl
->identifier
, state
->version_string
);
2189 if (this->type
->qualifier
.flags
.q
.in
) {
2190 _mesa_glsl_error(& loc
, state
,
2191 "`in' qualifier in declaration of `%s' "
2192 "only valid for function parameters in %s.",
2193 decl
->identifier
, state
->version_string
);
2195 /* FINISHME: Test for other invalid qualifiers. */
2198 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
,
2201 if (this->type
->qualifier
.flags
.q
.invariant
) {
2202 if ((state
->target
== vertex_shader
) && !(var
->mode
== ir_var_out
||
2203 var
->mode
== ir_var_inout
)) {
2204 /* FINISHME: Note that this doesn't work for invariant on
2205 * a function signature outval
2207 _mesa_glsl_error(& loc
, state
,
2208 "`%s' cannot be marked invariant, vertex shader "
2209 "outputs only\n", var
->name
);
2210 } else if ((state
->target
== fragment_shader
) &&
2211 !(var
->mode
== ir_var_in
|| var
->mode
== ir_var_inout
)) {
2212 /* FINISHME: Note that this doesn't work for invariant on
2213 * a function signature inval
2215 _mesa_glsl_error(& loc
, state
,
2216 "`%s' cannot be marked invariant, fragment shader "
2217 "inputs only\n", var
->name
);
2221 if (state
->current_function
!= NULL
) {
2222 const char *mode
= NULL
;
2223 const char *extra
= "";
2225 /* There is no need to check for 'inout' here because the parser will
2226 * only allow that in function parameter lists.
2228 if (this->type
->qualifier
.flags
.q
.attribute
) {
2230 } else if (this->type
->qualifier
.flags
.q
.uniform
) {
2232 } else if (this->type
->qualifier
.flags
.q
.varying
) {
2234 } else if (this->type
->qualifier
.flags
.q
.in
) {
2236 extra
= " or in function parameter list";
2237 } else if (this->type
->qualifier
.flags
.q
.out
) {
2239 extra
= " or in function parameter list";
2243 _mesa_glsl_error(& loc
, state
,
2244 "%s variable `%s' must be declared at "
2246 mode
, var
->name
, extra
);
2248 } else if (var
->mode
== ir_var_in
) {
2249 var
->read_only
= true;
2251 if (state
->target
== vertex_shader
) {
2252 bool error_emitted
= false;
2254 /* From page 31 (page 37 of the PDF) of the GLSL 1.50 spec:
2256 * "Vertex shader inputs can only be float, floating-point
2257 * vectors, matrices, signed and unsigned integers and integer
2258 * vectors. Vertex shader inputs can also form arrays of these
2259 * types, but not structures."
2261 * From page 31 (page 27 of the PDF) of the GLSL 1.30 spec:
2263 * "Vertex shader inputs can only be float, floating-point
2264 * vectors, matrices, signed and unsigned integers and integer
2265 * vectors. They cannot be arrays or structures."
2267 * From page 23 (page 29 of the PDF) of the GLSL 1.20 spec:
2269 * "The attribute qualifier can be used only with float,
2270 * floating-point vectors, and matrices. Attribute variables
2271 * cannot be declared as arrays or structures."
2273 const glsl_type
*check_type
= var
->type
->is_array()
2274 ? var
->type
->fields
.array
: var
->type
;
2276 switch (check_type
->base_type
) {
2277 case GLSL_TYPE_FLOAT
:
2279 case GLSL_TYPE_UINT
:
2281 if (state
->language_version
> 120)
2285 _mesa_glsl_error(& loc
, state
,
2286 "vertex shader input / attribute cannot have "
2288 var
->type
->is_array() ? "array of " : "",
2290 error_emitted
= true;
2293 if (!error_emitted
&& (state
->language_version
<= 130)
2294 && var
->type
->is_array()) {
2295 _mesa_glsl_error(& loc
, state
,
2296 "vertex shader input / attribute cannot have "
2298 error_emitted
= true;
2303 /* Integer vertex outputs must be qualified with 'flat'.
2305 * From section 4.3.6 of the GLSL 1.30 spec:
2306 * "If a vertex output is a signed or unsigned integer or integer
2307 * vector, then it must be qualified with the interpolation qualifier
2310 if (state
->language_version
>= 130
2311 && state
->target
== vertex_shader
2312 && state
->current_function
== NULL
2313 && var
->type
->is_integer()
2314 && var
->mode
== ir_var_out
2315 && var
->interpolation
!= ir_var_flat
) {
2317 _mesa_glsl_error(&loc
, state
, "If a vertex output is an integer, "
2318 "then it must be qualified with 'flat'");
2322 /* Interpolation qualifiers cannot be applied to 'centroid' and
2323 * 'centroid varying'.
2325 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
2326 * "interpolation qualifiers may only precede the qualifiers in,
2327 * centroid in, out, or centroid out in a declaration. They do not apply
2328 * to the deprecated storage qualifiers varying or centroid varying."
2330 if (state
->language_version
>= 130
2331 && this->type
->qualifier
.has_interpolation()
2332 && this->type
->qualifier
.flags
.q
.varying
) {
2334 const char *i
= this->type
->qualifier
.interpolation_string();
2337 if (this->type
->qualifier
.flags
.q
.centroid
)
2338 s
= "centroid varying";
2342 _mesa_glsl_error(&loc
, state
,
2343 "qualifier '%s' cannot be applied to the "
2344 "deprecated storage qualifier '%s'", i
, s
);
2348 /* Interpolation qualifiers can only apply to vertex shader outputs and
2349 * fragment shader inputs.
2351 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
2352 * "Outputs from a vertex shader (out) and inputs to a fragment
2353 * shader (in) can be further qualified with one or more of these
2354 * interpolation qualifiers"
2356 if (state
->language_version
>= 130
2357 && this->type
->qualifier
.has_interpolation()) {
2359 const char *i
= this->type
->qualifier
.interpolation_string();
2362 switch (state
->target
) {
2364 if (this->type
->qualifier
.flags
.q
.in
) {
2365 _mesa_glsl_error(&loc
, state
,
2366 "qualifier '%s' cannot be applied to vertex "
2367 "shader inputs", i
);
2370 case fragment_shader
:
2371 if (this->type
->qualifier
.flags
.q
.out
) {
2372 _mesa_glsl_error(&loc
, state
,
2373 "qualifier '%s' cannot be applied to fragment "
2374 "shader outputs", i
);
2383 /* From section 4.3.4 of the GLSL 1.30 spec:
2384 * "It is an error to use centroid in in a vertex shader."
2386 if (state
->language_version
>= 130
2387 && this->type
->qualifier
.flags
.q
.centroid
2388 && this->type
->qualifier
.flags
.q
.in
2389 && state
->target
== vertex_shader
) {
2391 _mesa_glsl_error(&loc
, state
,
2392 "'centroid in' cannot be used in a vertex shader");
2396 /* Precision qualifiers exists only in GLSL versions 1.00 and >= 1.30.
2398 if (this->type
->specifier
->precision
!= ast_precision_none
2399 && state
->language_version
!= 100
2400 && state
->language_version
< 130) {
2402 _mesa_glsl_error(&loc
, state
,
2403 "precision qualifiers are supported only in GLSL ES "
2404 "1.00, and GLSL 1.30 and later");
2408 /* Precision qualifiers only apply to floating point and integer types.
2410 * From section 4.5.2 of the GLSL 1.30 spec:
2411 * "Any floating point or any integer declaration can have the type
2412 * preceded by one of these precision qualifiers [...] Literal
2413 * constants do not have precision qualifiers. Neither do Boolean
2416 if (this->type
->specifier
->precision
!= ast_precision_none
2417 && !var
->type
->is_float()
2418 && !var
->type
->is_integer()
2419 && !(var
->type
->is_array()
2420 && (var
->type
->fields
.array
->is_float()
2421 || var
->type
->fields
.array
->is_integer()))) {
2423 _mesa_glsl_error(&loc
, state
,
2424 "precision qualifiers apply only to floating point "
2425 "and integer types");
2428 /* Process the initializer and add its instructions to a temporary
2429 * list. This list will be added to the instruction stream (below) after
2430 * the declaration is added. This is done because in some cases (such as
2431 * redeclarations) the declaration may not actually be added to the
2432 * instruction stream.
2434 exec_list initializer_instructions
;
2435 if (decl
->initializer
!= NULL
) {
2436 YYLTYPE initializer_loc
= decl
->initializer
->get_location();
2438 /* From page 24 (page 30 of the PDF) of the GLSL 1.10 spec:
2440 * "All uniform variables are read-only and are initialized either
2441 * directly by an application via API commands, or indirectly by
2444 if ((state
->language_version
<= 110)
2445 && (var
->mode
== ir_var_uniform
)) {
2446 _mesa_glsl_error(& initializer_loc
, state
,
2447 "cannot initialize uniforms in GLSL 1.10");
2450 if (var
->type
->is_sampler()) {
2451 _mesa_glsl_error(& initializer_loc
, state
,
2452 "cannot initialize samplers");
2455 if ((var
->mode
== ir_var_in
) && (state
->current_function
== NULL
)) {
2456 _mesa_glsl_error(& initializer_loc
, state
,
2457 "cannot initialize %s shader input / %s",
2458 _mesa_glsl_shader_target_name(state
->target
),
2459 (state
->target
== vertex_shader
)
2460 ? "attribute" : "varying");
2463 ir_dereference
*const lhs
= new(ctx
) ir_dereference_variable(var
);
2464 ir_rvalue
*rhs
= decl
->initializer
->hir(&initializer_instructions
,
2467 /* Calculate the constant value if this is a const or uniform
2470 if (this->type
->qualifier
.flags
.q
.constant
2471 || this->type
->qualifier
.flags
.q
.uniform
) {
2472 ir_rvalue
*new_rhs
= validate_assignment(state
, var
->type
, rhs
);
2473 if (new_rhs
!= NULL
) {
2476 ir_constant
*constant_value
= rhs
->constant_expression_value();
2477 if (!constant_value
) {
2478 _mesa_glsl_error(& initializer_loc
, state
,
2479 "initializer of %s variable `%s' must be a "
2480 "constant expression",
2481 (this->type
->qualifier
.flags
.q
.constant
)
2482 ? "const" : "uniform",
2484 if (var
->type
->is_numeric()) {
2485 /* Reduce cascading errors. */
2486 var
->constant_value
= ir_constant::zero(ctx
, var
->type
);
2489 rhs
= constant_value
;
2490 var
->constant_value
= constant_value
;
2493 _mesa_glsl_error(&initializer_loc
, state
,
2494 "initializer of type %s cannot be assigned to "
2495 "variable of type %s",
2496 rhs
->type
->name
, var
->type
->name
);
2497 if (var
->type
->is_numeric()) {
2498 /* Reduce cascading errors. */
2499 var
->constant_value
= ir_constant::zero(ctx
, var
->type
);
2504 if (rhs
&& !rhs
->type
->is_error()) {
2505 bool temp
= var
->read_only
;
2506 if (this->type
->qualifier
.flags
.q
.constant
)
2507 var
->read_only
= false;
2509 /* Never emit code to initialize a uniform.
2511 const glsl_type
*initializer_type
;
2512 if (!this->type
->qualifier
.flags
.q
.uniform
) {
2513 result
= do_assignment(&initializer_instructions
, state
,
2515 this->get_location());
2516 initializer_type
= result
->type
;
2518 initializer_type
= rhs
->type
;
2520 /* If the declared variable is an unsized array, it must inherrit
2521 * its full type from the initializer. A declaration such as
2523 * uniform float a[] = float[](1.0, 2.0, 3.0, 3.0);
2527 * uniform float a[4] = float[](1.0, 2.0, 3.0, 3.0);
2529 * The assignment generated in the if-statement (below) will also
2530 * automatically handle this case for non-uniforms.
2532 * If the declared variable is not an array, the types must
2533 * already match exactly. As a result, the type assignment
2534 * here can be done unconditionally. For non-uniforms the call
2535 * to do_assignment can change the type of the initializer (via
2536 * the implicit conversion rules). For uniforms the initializer
2537 * must be a constant expression, and the type of that expression
2538 * was validated above.
2540 var
->type
= initializer_type
;
2542 var
->read_only
= temp
;
2546 /* From page 23 (page 29 of the PDF) of the GLSL 1.10 spec:
2548 * "It is an error to write to a const variable outside of
2549 * its declaration, so they must be initialized when
2552 if (this->type
->qualifier
.flags
.q
.constant
&& decl
->initializer
== NULL
) {
2553 _mesa_glsl_error(& loc
, state
,
2554 "const declaration of `%s' must be initialized",
2558 /* Check if this declaration is actually a re-declaration, either to
2559 * resize an array or add qualifiers to an existing variable.
2561 * This is allowed for variables in the current scope, or when at
2562 * global scope (for built-ins in the implicit outer scope).
2564 ir_variable
*earlier
= state
->symbols
->get_variable(decl
->identifier
);
2565 if (earlier
!= NULL
&& (state
->current_function
== NULL
||
2566 state
->symbols
->name_declared_this_scope(decl
->identifier
))) {
2568 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec,
2570 * "It is legal to declare an array without a size and then
2571 * later re-declare the same name as an array of the same
2572 * type and specify a size."
2574 if ((earlier
->type
->array_size() == 0)
2575 && var
->type
->is_array()
2576 && (var
->type
->element_type() == earlier
->type
->element_type())) {
2577 /* FINISHME: This doesn't match the qualifiers on the two
2578 * FINISHME: declarations. It's not 100% clear whether this is
2579 * FINISHME: required or not.
2582 /* From page 54 (page 60 of the PDF) of the GLSL 1.20 spec:
2584 * "The size [of gl_TexCoord] can be at most
2585 * gl_MaxTextureCoords."
2587 const unsigned size
= unsigned(var
->type
->array_size());
2588 if ((strcmp("gl_TexCoord", var
->name
) == 0)
2589 && (size
> state
->Const
.MaxTextureCoords
)) {
2590 YYLTYPE loc
= this->get_location();
2592 _mesa_glsl_error(& loc
, state
, "`gl_TexCoord' array size cannot "
2593 "be larger than gl_MaxTextureCoords (%u)\n",
2594 state
->Const
.MaxTextureCoords
);
2595 } else if ((size
> 0) && (size
<= earlier
->max_array_access
)) {
2596 YYLTYPE loc
= this->get_location();
2598 _mesa_glsl_error(& loc
, state
, "array size must be > %u due to "
2600 earlier
->max_array_access
);
2603 earlier
->type
= var
->type
;
2606 } else if (state
->ARB_fragment_coord_conventions_enable
2607 && strcmp(var
->name
, "gl_FragCoord") == 0
2608 && earlier
->type
== var
->type
2609 && earlier
->mode
== var
->mode
) {
2610 /* Allow redeclaration of gl_FragCoord for ARB_fcc layout
2613 earlier
->origin_upper_left
= var
->origin_upper_left
;
2614 earlier
->pixel_center_integer
= var
->pixel_center_integer
;
2616 /* According to section 4.3.7 of the GLSL 1.30 spec,
2617 * the following built-in varaibles can be redeclared with an
2618 * interpolation qualifier:
2621 * * gl_FrontSecondaryColor
2622 * * gl_BackSecondaryColor
2624 * * gl_SecondaryColor
2626 } else if (state
->language_version
>= 130
2627 && (strcmp(var
->name
, "gl_FrontColor") == 0
2628 || strcmp(var
->name
, "gl_BackColor") == 0
2629 || strcmp(var
->name
, "gl_FrontSecondaryColor") == 0
2630 || strcmp(var
->name
, "gl_BackSecondaryColor") == 0
2631 || strcmp(var
->name
, "gl_Color") == 0
2632 || strcmp(var
->name
, "gl_SecondaryColor") == 0)
2633 && earlier
->type
== var
->type
2634 && earlier
->mode
== var
->mode
) {
2635 earlier
->interpolation
= var
->interpolation
;
2637 /* Layout qualifiers for gl_FragDepth. */
2638 } else if (state
->AMD_conservative_depth_enable
2639 && strcmp(var
->name
, "gl_FragDepth") == 0
2640 && earlier
->type
== var
->type
2641 && earlier
->mode
== var
->mode
) {
2643 /** From the AMD_conservative_depth spec:
2644 * Within any shader, the first redeclarations of gl_FragDepth
2645 * must appear before any use of gl_FragDepth.
2647 if (earlier
->used
) {
2648 _mesa_glsl_error(&loc
, state
,
2649 "the first redeclaration of gl_FragDepth "
2650 "must appear before any use of gl_FragDepth");
2653 /* Prevent inconsistent redeclaration of depth layout qualifier. */
2654 if (earlier
->depth_layout
!= ir_depth_layout_none
2655 && earlier
->depth_layout
!= var
->depth_layout
) {
2656 _mesa_glsl_error(&loc
, state
,
2657 "gl_FragDepth: depth layout is declared here "
2658 "as '%s, but it was previously declared as "
2660 depth_layout_string(var
->depth_layout
),
2661 depth_layout_string(earlier
->depth_layout
));
2664 earlier
->depth_layout
= var
->depth_layout
;
2667 YYLTYPE loc
= this->get_location();
2668 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", decl
->identifier
);
2674 /* By now, we know it's a new variable declaration (we didn't hit the
2675 * above "continue").
2677 * From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
2679 * "Identifiers starting with "gl_" are reserved for use by
2680 * OpenGL, and may not be declared in a shader as either a
2681 * variable or a function."
2683 if (strncmp(decl
->identifier
, "gl_", 3) == 0)
2684 _mesa_glsl_error(& loc
, state
,
2685 "identifier `%s' uses reserved `gl_' prefix",
2688 /* Add the variable to the symbol table. Note that the initializer's
2689 * IR was already processed earlier (though it hasn't been emitted yet),
2690 * without the variable in scope.
2692 * This differs from most C-like languages, but it follows the GLSL
2693 * specification. From page 28 (page 34 of the PDF) of the GLSL 1.50
2696 * "Within a declaration, the scope of a name starts immediately
2697 * after the initializer if present or immediately after the name
2698 * being declared if not."
2700 if (!state
->symbols
->add_variable(var
)) {
2701 YYLTYPE loc
= this->get_location();
2702 _mesa_glsl_error(&loc
, state
, "name `%s' already taken in the "
2703 "current scope", decl
->identifier
);
2707 /* Push the variable declaration to the top. It means that all
2708 * the variable declarations will appear in a funny
2709 * last-to-first order, but otherwise we run into trouble if a
2710 * function is prototyped, a global var is decled, then the
2711 * function is defined with usage of the global var. See
2712 * glslparsertest's CorrectModule.frag.
2714 instructions
->push_head(var
);
2715 instructions
->append_list(&initializer_instructions
);
2719 /* Generally, variable declarations do not have r-values. However,
2720 * one is used for the declaration in
2722 * while (bool b = some_condition()) {
2726 * so we return the rvalue from the last seen declaration here.
2733 ast_parameter_declarator::hir(exec_list
*instructions
,
2734 struct _mesa_glsl_parse_state
*state
)
2737 const struct glsl_type
*type
;
2738 const char *name
= NULL
;
2739 YYLTYPE loc
= this->get_location();
2741 type
= this->type
->specifier
->glsl_type(& name
, state
);
2745 _mesa_glsl_error(& loc
, state
,
2746 "invalid type `%s' in declaration of `%s'",
2747 name
, this->identifier
);
2749 _mesa_glsl_error(& loc
, state
,
2750 "invalid type in declaration of `%s'",
2754 type
= glsl_type::error_type
;
2757 /* From page 62 (page 68 of the PDF) of the GLSL 1.50 spec:
2759 * "Functions that accept no input arguments need not use void in the
2760 * argument list because prototypes (or definitions) are required and
2761 * therefore there is no ambiguity when an empty argument list "( )" is
2762 * declared. The idiom "(void)" as a parameter list is provided for
2765 * Placing this check here prevents a void parameter being set up
2766 * for a function, which avoids tripping up checks for main taking
2767 * parameters and lookups of an unnamed symbol.
2769 if (type
->is_void()) {
2770 if (this->identifier
!= NULL
)
2771 _mesa_glsl_error(& loc
, state
,
2772 "named parameter cannot have type `void'");
2778 if (formal_parameter
&& (this->identifier
== NULL
)) {
2779 _mesa_glsl_error(& loc
, state
, "formal parameter lacks a name");
2783 /* This only handles "vec4 foo[..]". The earlier specifier->glsl_type(...)
2784 * call already handled the "vec4[..] foo" case.
2786 if (this->is_array
) {
2787 type
= process_array_type(&loc
, type
, this->array_size
, state
);
2790 if (type
->array_size() == 0) {
2791 _mesa_glsl_error(&loc
, state
, "arrays passed as parameters must have "
2792 "a declared size.");
2793 type
= glsl_type::error_type
;
2797 ir_variable
*var
= new(ctx
) ir_variable(type
, this->identifier
, ir_var_in
);
2799 /* Apply any specified qualifiers to the parameter declaration. Note that
2800 * for function parameters the default mode is 'in'.
2802 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
, & loc
);
2804 instructions
->push_tail(var
);
2806 /* Parameter declarations do not have r-values.
2813 ast_parameter_declarator::parameters_to_hir(exec_list
*ast_parameters
,
2815 exec_list
*ir_parameters
,
2816 _mesa_glsl_parse_state
*state
)
2818 ast_parameter_declarator
*void_param
= NULL
;
2821 foreach_list_typed (ast_parameter_declarator
, param
, link
, ast_parameters
) {
2822 param
->formal_parameter
= formal
;
2823 param
->hir(ir_parameters
, state
);
2831 if ((void_param
!= NULL
) && (count
> 1)) {
2832 YYLTYPE loc
= void_param
->get_location();
2834 _mesa_glsl_error(& loc
, state
,
2835 "`void' parameter must be only parameter");
2841 emit_function(_mesa_glsl_parse_state
*state
, exec_list
*instructions
,
2844 /* Emit the new function header */
2845 if (state
->current_function
== NULL
) {
2846 instructions
->push_tail(f
);
2848 /* IR invariants disallow function declarations or definitions nested
2849 * within other function definitions. Insert the new ir_function
2850 * block in the instruction sequence before the ir_function block
2851 * containing the current ir_function_signature.
2853 ir_function
*const curr
=
2854 const_cast<ir_function
*>(state
->current_function
->function());
2856 curr
->insert_before(f
);
2862 ast_function::hir(exec_list
*instructions
,
2863 struct _mesa_glsl_parse_state
*state
)
2866 ir_function
*f
= NULL
;
2867 ir_function_signature
*sig
= NULL
;
2868 exec_list hir_parameters
;
2870 const char *const name
= identifier
;
2872 /* From page 21 (page 27 of the PDF) of the GLSL 1.20 spec,
2874 * "Function declarations (prototypes) cannot occur inside of functions;
2875 * they must be at global scope, or for the built-in functions, outside
2876 * the global scope."
2878 * From page 27 (page 33 of the PDF) of the GLSL ES 1.00.16 spec,
2880 * "User defined functions may only be defined within the global scope."
2882 * Note that this language does not appear in GLSL 1.10.
2884 if ((state
->current_function
!= NULL
) && (state
->language_version
!= 110)) {
2885 YYLTYPE loc
= this->get_location();
2886 _mesa_glsl_error(&loc
, state
,
2887 "declaration of function `%s' not allowed within "
2888 "function body", name
);
2891 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
2893 * "Identifiers starting with "gl_" are reserved for use by
2894 * OpenGL, and may not be declared in a shader as either a
2895 * variable or a function."
2897 if (strncmp(name
, "gl_", 3) == 0) {
2898 YYLTYPE loc
= this->get_location();
2899 _mesa_glsl_error(&loc
, state
,
2900 "identifier `%s' uses reserved `gl_' prefix", name
);
2903 /* Convert the list of function parameters to HIR now so that they can be
2904 * used below to compare this function's signature with previously seen
2905 * signatures for functions with the same name.
2907 ast_parameter_declarator::parameters_to_hir(& this->parameters
,
2909 & hir_parameters
, state
);
2911 const char *return_type_name
;
2912 const glsl_type
*return_type
=
2913 this->return_type
->specifier
->glsl_type(& return_type_name
, state
);
2916 YYLTYPE loc
= this->get_location();
2917 _mesa_glsl_error(&loc
, state
,
2918 "function `%s' has undeclared return type `%s'",
2919 name
, return_type_name
);
2920 return_type
= glsl_type::error_type
;
2923 /* From page 56 (page 62 of the PDF) of the GLSL 1.30 spec:
2924 * "No qualifier is allowed on the return type of a function."
2926 if (this->return_type
->has_qualifiers()) {
2927 YYLTYPE loc
= this->get_location();
2928 _mesa_glsl_error(& loc
, state
,
2929 "function `%s' return type has qualifiers", name
);
2932 /* Verify that this function's signature either doesn't match a previously
2933 * seen signature for a function with the same name, or, if a match is found,
2934 * that the previously seen signature does not have an associated definition.
2936 f
= state
->symbols
->get_function(name
);
2937 if (f
!= NULL
&& (state
->es_shader
|| f
->has_user_signature())) {
2938 sig
= f
->exact_matching_signature(&hir_parameters
);
2940 const char *badvar
= sig
->qualifiers_match(&hir_parameters
);
2941 if (badvar
!= NULL
) {
2942 YYLTYPE loc
= this->get_location();
2944 _mesa_glsl_error(&loc
, state
, "function `%s' parameter `%s' "
2945 "qualifiers don't match prototype", name
, badvar
);
2948 if (sig
->return_type
!= return_type
) {
2949 YYLTYPE loc
= this->get_location();
2951 _mesa_glsl_error(&loc
, state
, "function `%s' return type doesn't "
2952 "match prototype", name
);
2955 if (is_definition
&& sig
->is_defined
) {
2956 YYLTYPE loc
= this->get_location();
2958 _mesa_glsl_error(& loc
, state
, "function `%s' redefined", name
);
2962 f
= new(ctx
) ir_function(name
);
2963 if (!state
->symbols
->add_function(f
)) {
2964 /* This function name shadows a non-function use of the same name. */
2965 YYLTYPE loc
= this->get_location();
2967 _mesa_glsl_error(&loc
, state
, "function name `%s' conflicts with "
2968 "non-function", name
);
2972 emit_function(state
, instructions
, f
);
2975 /* Verify the return type of main() */
2976 if (strcmp(name
, "main") == 0) {
2977 if (! return_type
->is_void()) {
2978 YYLTYPE loc
= this->get_location();
2980 _mesa_glsl_error(& loc
, state
, "main() must return void");
2983 if (!hir_parameters
.is_empty()) {
2984 YYLTYPE loc
= this->get_location();
2986 _mesa_glsl_error(& loc
, state
, "main() must not take any parameters");
2990 /* Finish storing the information about this new function in its signature.
2993 sig
= new(ctx
) ir_function_signature(return_type
);
2994 f
->add_signature(sig
);
2997 sig
->replace_parameters(&hir_parameters
);
3000 /* Function declarations (prototypes) do not have r-values.
3007 ast_function_definition::hir(exec_list
*instructions
,
3008 struct _mesa_glsl_parse_state
*state
)
3010 prototype
->is_definition
= true;
3011 prototype
->hir(instructions
, state
);
3013 ir_function_signature
*signature
= prototype
->signature
;
3014 if (signature
== NULL
)
3017 assert(state
->current_function
== NULL
);
3018 state
->current_function
= signature
;
3019 state
->found_return
= false;
3021 /* Duplicate parameters declared in the prototype as concrete variables.
3022 * Add these to the symbol table.
3024 state
->symbols
->push_scope();
3025 foreach_iter(exec_list_iterator
, iter
, signature
->parameters
) {
3026 ir_variable
*const var
= ((ir_instruction
*) iter
.get())->as_variable();
3028 assert(var
!= NULL
);
3030 /* The only way a parameter would "exist" is if two parameters have
3033 if (state
->symbols
->name_declared_this_scope(var
->name
)) {
3034 YYLTYPE loc
= this->get_location();
3036 _mesa_glsl_error(& loc
, state
, "parameter `%s' redeclared", var
->name
);
3038 state
->symbols
->add_variable(var
);
3042 /* Convert the body of the function to HIR. */
3043 this->body
->hir(&signature
->body
, state
);
3044 signature
->is_defined
= true;
3046 state
->symbols
->pop_scope();
3048 assert(state
->current_function
== signature
);
3049 state
->current_function
= NULL
;
3051 if (!signature
->return_type
->is_void() && !state
->found_return
) {
3052 YYLTYPE loc
= this->get_location();
3053 _mesa_glsl_error(& loc
, state
, "function `%s' has non-void return type "
3054 "%s, but no return statement",
3055 signature
->function_name(),
3056 signature
->return_type
->name
);
3059 /* Function definitions do not have r-values.
3066 ast_jump_statement::hir(exec_list
*instructions
,
3067 struct _mesa_glsl_parse_state
*state
)
3074 assert(state
->current_function
);
3076 if (opt_return_value
) {
3077 ir_rvalue
*const ret
= opt_return_value
->hir(instructions
, state
);
3079 /* The value of the return type can be NULL if the shader says
3080 * 'return foo();' and foo() is a function that returns void.
3082 * NOTE: The GLSL spec doesn't say that this is an error. The type
3083 * of the return value is void. If the return type of the function is
3084 * also void, then this should compile without error. Seriously.
3086 const glsl_type
*const ret_type
=
3087 (ret
== NULL
) ? glsl_type::void_type
: ret
->type
;
3089 /* Implicit conversions are not allowed for return values. */
3090 if (state
->current_function
->return_type
!= ret_type
) {
3091 YYLTYPE loc
= this->get_location();
3093 _mesa_glsl_error(& loc
, state
,
3094 "`return' with wrong type %s, in function `%s' "
3097 state
->current_function
->function_name(),
3098 state
->current_function
->return_type
->name
);
3101 inst
= new(ctx
) ir_return(ret
);
3103 if (state
->current_function
->return_type
->base_type
!=
3105 YYLTYPE loc
= this->get_location();
3107 _mesa_glsl_error(& loc
, state
,
3108 "`return' with no value, in function %s returning "
3110 state
->current_function
->function_name());
3112 inst
= new(ctx
) ir_return
;
3115 state
->found_return
= true;
3116 instructions
->push_tail(inst
);
3121 if (state
->target
!= fragment_shader
) {
3122 YYLTYPE loc
= this->get_location();
3124 _mesa_glsl_error(& loc
, state
,
3125 "`discard' may only appear in a fragment shader");
3127 instructions
->push_tail(new(ctx
) ir_discard
);
3132 /* FINISHME: Handle switch-statements. They cannot contain 'continue',
3133 * FINISHME: and they use a different IR instruction for 'break'.
3135 /* FINISHME: Correctly handle the nesting. If a switch-statement is
3136 * FINISHME: inside a loop, a 'continue' is valid and will bind to the
3139 if (state
->loop_or_switch_nesting
== NULL
) {
3140 YYLTYPE loc
= this->get_location();
3142 _mesa_glsl_error(& loc
, state
,
3143 "`%s' may only appear in a loop",
3144 (mode
== ast_break
) ? "break" : "continue");
3146 ir_loop
*const loop
= state
->loop_or_switch_nesting
->as_loop();
3148 /* Inline the for loop expression again, since we don't know
3149 * where near the end of the loop body the normal copy of it
3150 * is going to be placed.
3152 if (mode
== ast_continue
&&
3153 state
->loop_or_switch_nesting_ast
->rest_expression
) {
3154 state
->loop_or_switch_nesting_ast
->rest_expression
->hir(instructions
,
3159 ir_loop_jump
*const jump
=
3160 new(ctx
) ir_loop_jump((mode
== ast_break
)
3161 ? ir_loop_jump::jump_break
3162 : ir_loop_jump::jump_continue
);
3163 instructions
->push_tail(jump
);
3170 /* Jump instructions do not have r-values.
3177 ast_selection_statement::hir(exec_list
*instructions
,
3178 struct _mesa_glsl_parse_state
*state
)
3182 ir_rvalue
*const condition
= this->condition
->hir(instructions
, state
);
3184 /* From page 66 (page 72 of the PDF) of the GLSL 1.50 spec:
3186 * "Any expression whose type evaluates to a Boolean can be used as the
3187 * conditional expression bool-expression. Vector types are not accepted
3188 * as the expression to if."
3190 * The checks are separated so that higher quality diagnostics can be
3191 * generated for cases where both rules are violated.
3193 if (!condition
->type
->is_boolean() || !condition
->type
->is_scalar()) {
3194 YYLTYPE loc
= this->condition
->get_location();
3196 _mesa_glsl_error(& loc
, state
, "if-statement condition must be scalar "
3200 ir_if
*const stmt
= new(ctx
) ir_if(condition
);
3202 if (then_statement
!= NULL
) {
3203 state
->symbols
->push_scope();
3204 then_statement
->hir(& stmt
->then_instructions
, state
);
3205 state
->symbols
->pop_scope();
3208 if (else_statement
!= NULL
) {
3209 state
->symbols
->push_scope();
3210 else_statement
->hir(& stmt
->else_instructions
, state
);
3211 state
->symbols
->pop_scope();
3214 instructions
->push_tail(stmt
);
3216 /* if-statements do not have r-values.
3223 ast_iteration_statement::condition_to_hir(ir_loop
*stmt
,
3224 struct _mesa_glsl_parse_state
*state
)
3228 if (condition
!= NULL
) {
3229 ir_rvalue
*const cond
=
3230 condition
->hir(& stmt
->body_instructions
, state
);
3233 || !cond
->type
->is_boolean() || !cond
->type
->is_scalar()) {
3234 YYLTYPE loc
= condition
->get_location();
3236 _mesa_glsl_error(& loc
, state
,
3237 "loop condition must be scalar boolean");
3239 /* As the first code in the loop body, generate a block that looks
3240 * like 'if (!condition) break;' as the loop termination condition.
3242 ir_rvalue
*const not_cond
=
3243 new(ctx
) ir_expression(ir_unop_logic_not
, glsl_type::bool_type
, cond
,
3246 ir_if
*const if_stmt
= new(ctx
) ir_if(not_cond
);
3248 ir_jump
*const break_stmt
=
3249 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
3251 if_stmt
->then_instructions
.push_tail(break_stmt
);
3252 stmt
->body_instructions
.push_tail(if_stmt
);
3259 ast_iteration_statement::hir(exec_list
*instructions
,
3260 struct _mesa_glsl_parse_state
*state
)
3264 /* For-loops and while-loops start a new scope, but do-while loops do not.
3266 if (mode
!= ast_do_while
)
3267 state
->symbols
->push_scope();
3269 if (init_statement
!= NULL
)
3270 init_statement
->hir(instructions
, state
);
3272 ir_loop
*const stmt
= new(ctx
) ir_loop();
3273 instructions
->push_tail(stmt
);
3275 /* Track the current loop and / or switch-statement nesting.
3277 ir_instruction
*const nesting
= state
->loop_or_switch_nesting
;
3278 ast_iteration_statement
*nesting_ast
= state
->loop_or_switch_nesting_ast
;
3280 state
->loop_or_switch_nesting
= stmt
;
3281 state
->loop_or_switch_nesting_ast
= this;
3283 if (mode
!= ast_do_while
)
3284 condition_to_hir(stmt
, state
);
3287 body
->hir(& stmt
->body_instructions
, state
);
3289 if (rest_expression
!= NULL
)
3290 rest_expression
->hir(& stmt
->body_instructions
, state
);
3292 if (mode
== ast_do_while
)
3293 condition_to_hir(stmt
, state
);
3295 if (mode
!= ast_do_while
)
3296 state
->symbols
->pop_scope();
3298 /* Restore previous nesting before returning.
3300 state
->loop_or_switch_nesting
= nesting
;
3301 state
->loop_or_switch_nesting_ast
= nesting_ast
;
3303 /* Loops do not have r-values.
3310 ast_type_specifier::hir(exec_list
*instructions
,
3311 struct _mesa_glsl_parse_state
*state
)
3313 if (!this->is_precision_statement
&& this->structure
== NULL
)
3316 YYLTYPE loc
= this->get_location();
3318 if (this->precision
!= ast_precision_none
3319 && state
->language_version
!= 100
3320 && state
->language_version
< 130) {
3321 _mesa_glsl_error(&loc
, state
,
3322 "precision qualifiers exist only in "
3323 "GLSL ES 1.00, and GLSL 1.30 and later");
3326 if (this->precision
!= ast_precision_none
3327 && this->structure
!= NULL
) {
3328 _mesa_glsl_error(&loc
, state
,
3329 "precision qualifiers do not apply to structures");
3333 /* If this is a precision statement, check that the type to which it is
3334 * applied is either float or int.
3336 * From section 4.5.3 of the GLSL 1.30 spec:
3337 * "The precision statement
3338 * precision precision-qualifier type;
3339 * can be used to establish a default precision qualifier. The type
3340 * field can be either int or float [...]. Any other types or
3341 * qualifiers will result in an error.
3343 if (this->is_precision_statement
) {
3344 assert(this->precision
!= ast_precision_none
);
3345 assert(this->structure
== NULL
); /* The check for structures was
3346 * performed above. */
3347 if (this->is_array
) {
3348 _mesa_glsl_error(&loc
, state
,
3349 "default precision statements do not apply to "
3353 if (this->type_specifier
!= ast_float
3354 && this->type_specifier
!= ast_int
) {
3355 _mesa_glsl_error(&loc
, state
,
3356 "default precision statements apply only to types "
3361 /* FINISHME: Translate precision statements into IR. */
3365 if (this->structure
!= NULL
)
3366 return this->structure
->hir(instructions
, state
);
3373 ast_struct_specifier::hir(exec_list
*instructions
,
3374 struct _mesa_glsl_parse_state
*state
)
3376 unsigned decl_count
= 0;
3378 /* Make an initial pass over the list of structure fields to determine how
3379 * many there are. Each element in this list is an ast_declarator_list.
3380 * This means that we actually need to count the number of elements in the
3381 * 'declarations' list in each of the elements.
3383 foreach_list_typed (ast_declarator_list
, decl_list
, link
,
3384 &this->declarations
) {
3385 foreach_list_const (decl_ptr
, & decl_list
->declarations
) {
3390 /* Allocate storage for the structure fields and process the field
3391 * declarations. As the declarations are processed, try to also convert
3392 * the types to HIR. This ensures that structure definitions embedded in
3393 * other structure definitions are processed.
3395 glsl_struct_field
*const fields
= talloc_array(state
, glsl_struct_field
,
3399 foreach_list_typed (ast_declarator_list
, decl_list
, link
,
3400 &this->declarations
) {
3401 const char *type_name
;
3403 decl_list
->type
->specifier
->hir(instructions
, state
);
3405 /* Section 10.9 of the GLSL ES 1.00 specification states that
3406 * embedded structure definitions have been removed from the language.
3408 if (state
->es_shader
&& decl_list
->type
->specifier
->structure
!= NULL
) {
3409 YYLTYPE loc
= this->get_location();
3410 _mesa_glsl_error(&loc
, state
, "Embedded structure definitions are "
3411 "not allowed in GLSL ES 1.00.");
3414 const glsl_type
*decl_type
=
3415 decl_list
->type
->specifier
->glsl_type(& type_name
, state
);
3417 foreach_list_typed (ast_declaration
, decl
, link
,
3418 &decl_list
->declarations
) {
3419 const struct glsl_type
*field_type
= decl_type
;
3420 if (decl
->is_array
) {
3421 YYLTYPE loc
= decl
->get_location();
3422 field_type
= process_array_type(&loc
, decl_type
, decl
->array_size
,
3425 fields
[i
].type
= (field_type
!= NULL
)
3426 ? field_type
: glsl_type::error_type
;
3427 fields
[i
].name
= decl
->identifier
;
3432 assert(i
== decl_count
);
3434 const glsl_type
*t
=
3435 glsl_type::get_record_instance(fields
, decl_count
, this->name
);
3437 YYLTYPE loc
= this->get_location();
3438 if (!state
->symbols
->add_type(name
, t
)) {
3439 _mesa_glsl_error(& loc
, state
, "struct `%s' previously defined", name
);
3442 const glsl_type
**s
= (const glsl_type
**)
3443 realloc(state
->user_structures
,
3444 sizeof(state
->user_structures
[0]) *
3445 (state
->num_user_structures
+ 1));
3447 s
[state
->num_user_structures
] = t
;
3448 state
->user_structures
= s
;
3449 state
->num_user_structures
++;
3453 /* Structure type definitions do not have r-values.