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
->is_lvalue()) {
643 _mesa_glsl_error(& lhs_loc
, state
, "non-lvalue in assignment");
644 error_emitted
= true;
647 if (state
->es_shader
&& lhs
->type
->is_array()) {
648 _mesa_glsl_error(&lhs_loc
, state
, "whole array assignment is not "
649 "allowed in GLSL ES 1.00.");
650 error_emitted
= true;
654 ir_rvalue
*new_rhs
= validate_assignment(state
, lhs
->type
, rhs
);
655 if (new_rhs
== NULL
) {
656 _mesa_glsl_error(& lhs_loc
, state
, "type mismatch");
660 /* If the LHS array was not declared with a size, it takes it size from
661 * the RHS. If the LHS is an l-value and a whole array, it must be a
662 * dereference of a variable. Any other case would require that the LHS
663 * is either not an l-value or not a whole array.
665 if (lhs
->type
->array_size() == 0) {
666 ir_dereference
*const d
= lhs
->as_dereference();
670 ir_variable
*const var
= d
->variable_referenced();
674 if (var
->max_array_access
>= unsigned(rhs
->type
->array_size())) {
675 /* FINISHME: This should actually log the location of the RHS. */
676 _mesa_glsl_error(& lhs_loc
, state
, "array size must be > %u due to "
678 var
->max_array_access
);
681 var
->type
= glsl_type::get_array_instance(lhs
->type
->element_type(),
682 rhs
->type
->array_size());
687 /* Most callers of do_assignment (assign, add_assign, pre_inc/dec,
688 * but not post_inc) need the converted assigned value as an rvalue
689 * to handle things like:
693 * So we always just store the computed value being assigned to a
694 * temporary and return a deref of that temporary. If the rvalue
695 * ends up not being used, the temp will get copy-propagated out.
697 ir_variable
*var
= new(ctx
) ir_variable(rhs
->type
, "assignment_tmp",
699 ir_dereference_variable
*deref_var
= new(ctx
) ir_dereference_variable(var
);
700 instructions
->push_tail(var
);
701 instructions
->push_tail(new(ctx
) ir_assignment(deref_var
,
704 deref_var
= new(ctx
) ir_dereference_variable(var
);
707 instructions
->push_tail(new(ctx
) ir_assignment(lhs
, deref_var
, NULL
));
709 return new(ctx
) ir_dereference_variable(var
);
713 get_lvalue_copy(exec_list
*instructions
, ir_rvalue
*lvalue
)
715 void *ctx
= talloc_parent(lvalue
);
718 var
= new(ctx
) ir_variable(lvalue
->type
, "_post_incdec_tmp",
720 instructions
->push_tail(var
);
721 var
->mode
= ir_var_auto
;
723 instructions
->push_tail(new(ctx
) ir_assignment(new(ctx
) ir_dereference_variable(var
),
726 /* Once we've created this temporary, mark it read only so it's no
727 * longer considered an lvalue.
729 var
->read_only
= true;
731 return new(ctx
) ir_dereference_variable(var
);
736 ast_node::hir(exec_list
*instructions
,
737 struct _mesa_glsl_parse_state
*state
)
746 mark_whole_array_access(ir_rvalue
*access
)
748 ir_dereference_variable
*deref
= access
->as_dereference_variable();
751 deref
->var
->max_array_access
= deref
->type
->length
- 1;
756 do_comparison(void *mem_ctx
, int operation
, ir_rvalue
*op0
, ir_rvalue
*op1
)
759 ir_rvalue
*cmp
= NULL
;
761 if (operation
== ir_binop_all_equal
)
762 join_op
= ir_binop_logic_and
;
764 join_op
= ir_binop_logic_or
;
766 switch (op0
->type
->base_type
) {
767 case GLSL_TYPE_FLOAT
:
771 return new(mem_ctx
) ir_expression(operation
, op0
, op1
);
773 case GLSL_TYPE_ARRAY
: {
774 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
775 ir_rvalue
*e0
, *e1
, *result
;
777 e0
= new(mem_ctx
) ir_dereference_array(op0
->clone(mem_ctx
, NULL
),
778 new(mem_ctx
) ir_constant(i
));
779 e1
= new(mem_ctx
) ir_dereference_array(op1
->clone(mem_ctx
, NULL
),
780 new(mem_ctx
) ir_constant(i
));
781 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
784 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
790 mark_whole_array_access(op0
);
791 mark_whole_array_access(op1
);
795 case GLSL_TYPE_STRUCT
: {
796 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
797 ir_rvalue
*e0
, *e1
, *result
;
798 const char *field_name
= op0
->type
->fields
.structure
[i
].name
;
800 e0
= new(mem_ctx
) ir_dereference_record(op0
->clone(mem_ctx
, NULL
),
802 e1
= new(mem_ctx
) ir_dereference_record(op1
->clone(mem_ctx
, NULL
),
804 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
807 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
815 case GLSL_TYPE_ERROR
:
817 case GLSL_TYPE_SAMPLER
:
818 /* I assume a comparison of a struct containing a sampler just
819 * ignores the sampler present in the type.
824 assert(!"Should not get here.");
829 cmp
= new(mem_ctx
) ir_constant(true);
835 ast_expression::hir(exec_list
*instructions
,
836 struct _mesa_glsl_parse_state
*state
)
839 static const int operations
[AST_NUM_OPERATORS
] = {
840 -1, /* ast_assign doesn't convert to ir_expression. */
841 -1, /* ast_plus doesn't convert to ir_expression. */
865 /* Note: The following block of expression types actually convert
866 * to multiple IR instructions.
868 ir_binop_mul
, /* ast_mul_assign */
869 ir_binop_div
, /* ast_div_assign */
870 ir_binop_mod
, /* ast_mod_assign */
871 ir_binop_add
, /* ast_add_assign */
872 ir_binop_sub
, /* ast_sub_assign */
873 ir_binop_lshift
, /* ast_ls_assign */
874 ir_binop_rshift
, /* ast_rs_assign */
875 ir_binop_bit_and
, /* ast_and_assign */
876 ir_binop_bit_xor
, /* ast_xor_assign */
877 ir_binop_bit_or
, /* ast_or_assign */
879 -1, /* ast_conditional doesn't convert to ir_expression. */
880 ir_binop_add
, /* ast_pre_inc. */
881 ir_binop_sub
, /* ast_pre_dec. */
882 ir_binop_add
, /* ast_post_inc. */
883 ir_binop_sub
, /* ast_post_dec. */
884 -1, /* ast_field_selection doesn't conv to ir_expression. */
885 -1, /* ast_array_index doesn't convert to ir_expression. */
886 -1, /* ast_function_call doesn't conv to ir_expression. */
887 -1, /* ast_identifier doesn't convert to ir_expression. */
888 -1, /* ast_int_constant doesn't convert to ir_expression. */
889 -1, /* ast_uint_constant doesn't conv to ir_expression. */
890 -1, /* ast_float_constant doesn't conv to ir_expression. */
891 -1, /* ast_bool_constant doesn't conv to ir_expression. */
892 -1, /* ast_sequence doesn't convert to ir_expression. */
894 ir_rvalue
*result
= NULL
;
896 const struct glsl_type
*type
= glsl_type::error_type
;
897 bool error_emitted
= false;
900 loc
= this->get_location();
902 switch (this->oper
) {
904 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
905 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
907 result
= do_assignment(instructions
, state
, op
[0], op
[1],
908 this->subexpressions
[0]->get_location());
909 error_emitted
= result
->type
->is_error();
915 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
917 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
919 error_emitted
= type
->is_error();
925 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
927 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
929 error_emitted
= type
->is_error();
931 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
939 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
940 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
942 type
= arithmetic_result_type(op
[0], op
[1],
943 (this->oper
== ast_mul
),
945 error_emitted
= type
->is_error();
947 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
952 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
953 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
955 type
= modulus_result_type(op
[0]->type
, op
[1]->type
, state
, & loc
);
957 assert(operations
[this->oper
] == ir_binop_mod
);
959 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
961 error_emitted
= type
->is_error();
966 if (state
->language_version
< 130) {
967 _mesa_glsl_error(&loc
, state
, "operator %s requires GLSL 1.30",
968 operator_string(this->oper
));
969 error_emitted
= true;
972 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
973 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
974 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
976 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
978 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
985 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
986 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
988 type
= relational_result_type(op
[0], op
[1], state
, & loc
);
990 /* The relational operators must either generate an error or result
991 * in a scalar boolean. See page 57 of the GLSL 1.50 spec.
993 assert(type
->is_error()
994 || ((type
->base_type
== GLSL_TYPE_BOOL
)
995 && type
->is_scalar()));
997 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
999 error_emitted
= type
->is_error();
1004 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1005 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1007 /* From page 58 (page 64 of the PDF) of the GLSL 1.50 spec:
1009 * "The equality operators equal (==), and not equal (!=)
1010 * operate on all types. They result in a scalar Boolean. If
1011 * the operand types do not match, then there must be a
1012 * conversion from Section 4.1.10 "Implicit Conversions"
1013 * applied to one operand that can make them match, in which
1014 * case this conversion is done."
1016 if ((!apply_implicit_conversion(op
[0]->type
, op
[1], state
)
1017 && !apply_implicit_conversion(op
[1]->type
, op
[0], state
))
1018 || (op
[0]->type
!= op
[1]->type
)) {
1019 _mesa_glsl_error(& loc
, state
, "operands of `%s' must have the same "
1020 "type", (this->oper
== ast_equal
) ? "==" : "!=");
1021 error_emitted
= true;
1022 } else if ((state
->language_version
<= 110)
1023 && (op
[0]->type
->is_array() || op
[1]->type
->is_array())) {
1024 _mesa_glsl_error(& loc
, state
, "array comparisons forbidden in "
1026 error_emitted
= true;
1029 result
= do_comparison(ctx
, operations
[this->oper
], op
[0], op
[1]);
1030 type
= glsl_type::bool_type
;
1032 assert(error_emitted
|| (result
->type
== glsl_type::bool_type
));
1038 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1039 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1040 type
= bit_logic_result_type(op
[0]->type
, op
[1]->type
, this->oper
,
1042 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1044 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1048 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1050 if (state
->language_version
< 130) {
1051 _mesa_glsl_error(&loc
, state
, "bit-wise operations require GLSL 1.30");
1052 error_emitted
= true;
1055 if (!op
[0]->type
->is_integer()) {
1056 _mesa_glsl_error(&loc
, state
, "operand of `~' must be an integer");
1057 error_emitted
= true;
1061 result
= new(ctx
) ir_expression(ir_unop_bit_not
, type
, op
[0], NULL
);
1064 case ast_logic_and
: {
1065 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1067 if (!op
[0]->type
->is_boolean() || !op
[0]->type
->is_scalar()) {
1068 YYLTYPE loc
= this->subexpressions
[0]->get_location();
1070 _mesa_glsl_error(& loc
, state
, "LHS of `%s' must be scalar boolean",
1071 operator_string(this->oper
));
1072 error_emitted
= true;
1075 ir_constant
*op0_const
= op
[0]->constant_expression_value();
1077 if (op0_const
->value
.b
[0]) {
1078 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1080 if (!op
[1]->type
->is_boolean() || !op
[1]->type
->is_scalar()) {
1081 YYLTYPE loc
= this->subexpressions
[1]->get_location();
1083 _mesa_glsl_error(& loc
, state
,
1084 "RHS of `%s' must be scalar boolean",
1085 operator_string(this->oper
));
1086 error_emitted
= true;
1092 type
= glsl_type::bool_type
;
1094 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1097 instructions
->push_tail(tmp
);
1099 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1100 instructions
->push_tail(stmt
);
1102 op
[1] = this->subexpressions
[1]->hir(&stmt
->then_instructions
, state
);
1104 if (!op
[1]->type
->is_boolean() || !op
[1]->type
->is_scalar()) {
1105 YYLTYPE loc
= this->subexpressions
[1]->get_location();
1107 _mesa_glsl_error(& loc
, state
,
1108 "RHS of `%s' must be scalar boolean",
1109 operator_string(this->oper
));
1110 error_emitted
= true;
1113 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1114 ir_assignment
*const then_assign
=
1115 new(ctx
) ir_assignment(then_deref
, op
[1], NULL
);
1116 stmt
->then_instructions
.push_tail(then_assign
);
1118 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1119 ir_assignment
*const else_assign
=
1120 new(ctx
) ir_assignment(else_deref
, new(ctx
) ir_constant(false), NULL
);
1121 stmt
->else_instructions
.push_tail(else_assign
);
1123 result
= new(ctx
) ir_dereference_variable(tmp
);
1129 case ast_logic_or
: {
1130 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1132 if (!op
[0]->type
->is_boolean() || !op
[0]->type
->is_scalar()) {
1133 YYLTYPE loc
= this->subexpressions
[0]->get_location();
1135 _mesa_glsl_error(& loc
, state
, "LHS of `%s' must be scalar boolean",
1136 operator_string(this->oper
));
1137 error_emitted
= true;
1140 ir_constant
*op0_const
= op
[0]->constant_expression_value();
1142 if (op0_const
->value
.b
[0]) {
1145 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1147 if (!op
[1]->type
->is_boolean() || !op
[1]->type
->is_scalar()) {
1148 YYLTYPE loc
= this->subexpressions
[1]->get_location();
1150 _mesa_glsl_error(& loc
, state
,
1151 "RHS of `%s' must be scalar boolean",
1152 operator_string(this->oper
));
1153 error_emitted
= true;
1157 type
= glsl_type::bool_type
;
1159 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1162 instructions
->push_tail(tmp
);
1164 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1165 instructions
->push_tail(stmt
);
1167 op
[1] = this->subexpressions
[1]->hir(&stmt
->else_instructions
, state
);
1169 if (!op
[1]->type
->is_boolean() || !op
[1]->type
->is_scalar()) {
1170 YYLTYPE loc
= this->subexpressions
[1]->get_location();
1172 _mesa_glsl_error(& loc
, state
, "RHS of `%s' must be scalar boolean",
1173 operator_string(this->oper
));
1174 error_emitted
= true;
1177 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1178 ir_assignment
*const then_assign
=
1179 new(ctx
) ir_assignment(then_deref
, new(ctx
) ir_constant(true), NULL
);
1180 stmt
->then_instructions
.push_tail(then_assign
);
1182 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1183 ir_assignment
*const else_assign
=
1184 new(ctx
) ir_assignment(else_deref
, op
[1], NULL
);
1185 stmt
->else_instructions
.push_tail(else_assign
);
1187 result
= new(ctx
) ir_dereference_variable(tmp
);
1194 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1195 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1198 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1200 type
= glsl_type::bool_type
;
1204 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1206 if (!op
[0]->type
->is_boolean() || !op
[0]->type
->is_scalar()) {
1207 YYLTYPE loc
= this->subexpressions
[0]->get_location();
1209 _mesa_glsl_error(& loc
, state
,
1210 "operand of `!' must be scalar boolean");
1211 error_emitted
= true;
1214 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1216 type
= glsl_type::bool_type
;
1219 case ast_mul_assign
:
1220 case ast_div_assign
:
1221 case ast_add_assign
:
1222 case ast_sub_assign
: {
1223 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1224 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1226 type
= arithmetic_result_type(op
[0], op
[1],
1227 (this->oper
== ast_mul_assign
),
1230 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1233 result
= do_assignment(instructions
, state
,
1234 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1235 this->subexpressions
[0]->get_location());
1236 type
= result
->type
;
1237 error_emitted
= (op
[0]->type
->is_error());
1239 /* GLSL 1.10 does not allow array assignment. However, we don't have to
1240 * explicitly test for this because none of the binary expression
1241 * operators allow array operands either.
1247 case ast_mod_assign
: {
1248 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1249 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1251 type
= modulus_result_type(op
[0]->type
, op
[1]->type
, state
, & loc
);
1253 assert(operations
[this->oper
] == ir_binop_mod
);
1255 ir_rvalue
*temp_rhs
;
1256 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1259 result
= do_assignment(instructions
, state
,
1260 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1261 this->subexpressions
[0]->get_location());
1262 type
= result
->type
;
1263 error_emitted
= type
->is_error();
1268 case ast_rs_assign
: {
1269 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1270 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1271 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1273 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1274 type
, op
[0], op
[1]);
1275 result
= do_assignment(instructions
, state
, op
[0]->clone(ctx
, NULL
),
1277 this->subexpressions
[0]->get_location());
1278 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1282 case ast_and_assign
:
1283 case ast_xor_assign
:
1284 case ast_or_assign
: {
1285 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1286 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1287 type
= bit_logic_result_type(op
[0]->type
, op
[1]->type
, this->oper
,
1289 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1290 type
, op
[0], op
[1]);
1291 result
= do_assignment(instructions
, state
, op
[0]->clone(ctx
, NULL
),
1293 this->subexpressions
[0]->get_location());
1294 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1298 case ast_conditional
: {
1299 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1301 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1303 * "The ternary selection operator (?:). It operates on three
1304 * expressions (exp1 ? exp2 : exp3). This operator evaluates the
1305 * first expression, which must result in a scalar Boolean."
1307 if (!op
[0]->type
->is_boolean() || !op
[0]->type
->is_scalar()) {
1308 YYLTYPE loc
= this->subexpressions
[0]->get_location();
1310 _mesa_glsl_error(& loc
, state
, "?: condition must be scalar boolean");
1311 error_emitted
= true;
1314 /* The :? operator is implemented by generating an anonymous temporary
1315 * followed by an if-statement. The last instruction in each branch of
1316 * the if-statement assigns a value to the anonymous temporary. This
1317 * temporary is the r-value of the expression.
1319 exec_list then_instructions
;
1320 exec_list else_instructions
;
1322 op
[1] = this->subexpressions
[1]->hir(&then_instructions
, state
);
1323 op
[2] = this->subexpressions
[2]->hir(&else_instructions
, state
);
1325 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1327 * "The second and third expressions can be any type, as
1328 * long their types match, or there is a conversion in
1329 * Section 4.1.10 "Implicit Conversions" that can be applied
1330 * to one of the expressions to make their types match. This
1331 * resulting matching type is the type of the entire
1334 if ((!apply_implicit_conversion(op
[1]->type
, op
[2], state
)
1335 && !apply_implicit_conversion(op
[2]->type
, op
[1], state
))
1336 || (op
[1]->type
!= op
[2]->type
)) {
1337 YYLTYPE loc
= this->subexpressions
[1]->get_location();
1339 _mesa_glsl_error(& loc
, state
, "Second and third operands of ?: "
1340 "operator must have matching types.");
1341 error_emitted
= true;
1342 type
= glsl_type::error_type
;
1347 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1349 * "The second and third expressions must be the same type, but can
1350 * be of any type other than an array."
1352 if ((state
->language_version
<= 110) && type
->is_array()) {
1353 _mesa_glsl_error(& loc
, state
, "Second and third operands of ?: "
1354 "operator must not be arrays.");
1355 error_emitted
= true;
1358 ir_constant
*cond_val
= op
[0]->constant_expression_value();
1359 ir_constant
*then_val
= op
[1]->constant_expression_value();
1360 ir_constant
*else_val
= op
[2]->constant_expression_value();
1362 if (then_instructions
.is_empty()
1363 && else_instructions
.is_empty()
1364 && (cond_val
!= NULL
) && (then_val
!= NULL
) && (else_val
!= NULL
)) {
1365 result
= (cond_val
->value
.b
[0]) ? then_val
: else_val
;
1367 ir_variable
*const tmp
=
1368 new(ctx
) ir_variable(type
, "conditional_tmp", ir_var_temporary
);
1369 instructions
->push_tail(tmp
);
1371 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1372 instructions
->push_tail(stmt
);
1374 then_instructions
.move_nodes_to(& stmt
->then_instructions
);
1375 ir_dereference
*const then_deref
=
1376 new(ctx
) ir_dereference_variable(tmp
);
1377 ir_assignment
*const then_assign
=
1378 new(ctx
) ir_assignment(then_deref
, op
[1], NULL
);
1379 stmt
->then_instructions
.push_tail(then_assign
);
1381 else_instructions
.move_nodes_to(& stmt
->else_instructions
);
1382 ir_dereference
*const else_deref
=
1383 new(ctx
) ir_dereference_variable(tmp
);
1384 ir_assignment
*const else_assign
=
1385 new(ctx
) ir_assignment(else_deref
, op
[2], NULL
);
1386 stmt
->else_instructions
.push_tail(else_assign
);
1388 result
= new(ctx
) ir_dereference_variable(tmp
);
1395 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1396 if (op
[0]->type
->base_type
== GLSL_TYPE_FLOAT
)
1397 op
[1] = new(ctx
) ir_constant(1.0f
);
1399 op
[1] = new(ctx
) ir_constant(1);
1401 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1403 ir_rvalue
*temp_rhs
;
1404 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1407 result
= do_assignment(instructions
, state
,
1408 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1409 this->subexpressions
[0]->get_location());
1410 type
= result
->type
;
1411 error_emitted
= op
[0]->type
->is_error();
1416 case ast_post_dec
: {
1417 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1418 if (op
[0]->type
->base_type
== GLSL_TYPE_FLOAT
)
1419 op
[1] = new(ctx
) ir_constant(1.0f
);
1421 op
[1] = new(ctx
) ir_constant(1);
1423 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1425 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1427 ir_rvalue
*temp_rhs
;
1428 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1431 /* Get a temporary of a copy of the lvalue before it's modified.
1432 * This may get thrown away later.
1434 result
= get_lvalue_copy(instructions
, op
[0]->clone(ctx
, NULL
));
1436 (void)do_assignment(instructions
, state
,
1437 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1438 this->subexpressions
[0]->get_location());
1440 type
= result
->type
;
1441 error_emitted
= op
[0]->type
->is_error();
1445 case ast_field_selection
:
1446 result
= _mesa_ast_field_selection_to_hir(this, instructions
, state
);
1447 type
= result
->type
;
1450 case ast_array_index
: {
1451 YYLTYPE index_loc
= subexpressions
[1]->get_location();
1453 op
[0] = subexpressions
[0]->hir(instructions
, state
);
1454 op
[1] = subexpressions
[1]->hir(instructions
, state
);
1456 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1458 ir_rvalue
*const array
= op
[0];
1460 result
= new(ctx
) ir_dereference_array(op
[0], op
[1]);
1462 /* Do not use op[0] after this point. Use array.
1470 if (!array
->type
->is_array()
1471 && !array
->type
->is_matrix()
1472 && !array
->type
->is_vector()) {
1473 _mesa_glsl_error(& index_loc
, state
,
1474 "cannot dereference non-array / non-matrix / "
1476 error_emitted
= true;
1479 if (!op
[1]->type
->is_integer()) {
1480 _mesa_glsl_error(& index_loc
, state
,
1481 "array index must be integer type");
1482 error_emitted
= true;
1483 } else if (!op
[1]->type
->is_scalar()) {
1484 _mesa_glsl_error(& index_loc
, state
,
1485 "array index must be scalar");
1486 error_emitted
= true;
1489 /* If the array index is a constant expression and the array has a
1490 * declared size, ensure that the access is in-bounds. If the array
1491 * index is not a constant expression, ensure that the array has a
1494 ir_constant
*const const_index
= op
[1]->constant_expression_value();
1495 if (const_index
!= NULL
) {
1496 const int idx
= const_index
->value
.i
[0];
1497 const char *type_name
;
1500 if (array
->type
->is_matrix()) {
1501 type_name
= "matrix";
1502 } else if (array
->type
->is_vector()) {
1503 type_name
= "vector";
1505 type_name
= "array";
1508 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec:
1510 * "It is illegal to declare an array with a size, and then
1511 * later (in the same shader) index the same array with an
1512 * integral constant expression greater than or equal to the
1513 * declared size. It is also illegal to index an array with a
1514 * negative constant expression."
1516 if (array
->type
->is_matrix()) {
1517 if (array
->type
->row_type()->vector_elements
<= idx
) {
1518 bound
= array
->type
->row_type()->vector_elements
;
1520 } else if (array
->type
->is_vector()) {
1521 if (array
->type
->vector_elements
<= idx
) {
1522 bound
= array
->type
->vector_elements
;
1525 if ((array
->type
->array_size() > 0)
1526 && (array
->type
->array_size() <= idx
)) {
1527 bound
= array
->type
->array_size();
1532 _mesa_glsl_error(& loc
, state
, "%s index must be < %u",
1534 error_emitted
= true;
1535 } else if (idx
< 0) {
1536 _mesa_glsl_error(& loc
, state
, "%s index must be >= 0",
1538 error_emitted
= true;
1541 if (array
->type
->is_array()) {
1542 /* If the array is a variable dereference, it dereferences the
1543 * whole array, by definition. Use this to get the variable.
1545 * FINISHME: Should some methods for getting / setting / testing
1546 * FINISHME: array access limits be added to ir_dereference?
1548 ir_variable
*const v
= array
->whole_variable_referenced();
1549 if ((v
!= NULL
) && (unsigned(idx
) > v
->max_array_access
))
1550 v
->max_array_access
= idx
;
1552 } else if (array
->type
->array_size() == 0) {
1553 _mesa_glsl_error(&loc
, state
, "unsized array index must be constant");
1555 if (array
->type
->is_array()) {
1556 /* whole_variable_referenced can return NULL if the array is a
1557 * member of a structure. In this case it is safe to not update
1558 * the max_array_access field because it is never used for fields
1561 ir_variable
*v
= array
->whole_variable_referenced();
1563 v
->max_array_access
= array
->type
->array_size();
1567 /* From page 23 (29 of the PDF) of the GLSL 1.30 spec:
1569 * "Samplers aggregated into arrays within a shader (using square
1570 * brackets [ ]) can only be indexed with integral constant
1571 * expressions [...]."
1573 * This restriction was added in GLSL 1.30. Shaders using earlier version
1574 * of the language should not be rejected by the compiler front-end for
1575 * using this construct. This allows useful things such as using a loop
1576 * counter as the index to an array of samplers. If the loop in unrolled,
1577 * the code should compile correctly. Instead, emit a warning.
1579 if (array
->type
->is_array() &&
1580 array
->type
->element_type()->is_sampler() &&
1581 const_index
== NULL
) {
1583 if (state
->language_version
== 100) {
1584 _mesa_glsl_warning(&loc
, state
,
1585 "sampler arrays indexed with non-constant "
1586 "expressions is optional in GLSL ES 1.00");
1587 } else if (state
->language_version
< 130) {
1588 _mesa_glsl_warning(&loc
, state
,
1589 "sampler arrays indexed with non-constant "
1590 "expressions is forbidden in GLSL 1.30 and "
1593 _mesa_glsl_error(&loc
, state
,
1594 "sampler arrays indexed with non-constant "
1595 "expressions is forbidden in GLSL 1.30 and "
1597 error_emitted
= true;
1602 result
->type
= glsl_type::error_type
;
1604 type
= result
->type
;
1608 case ast_function_call
:
1609 /* Should *NEVER* get here. ast_function_call should always be handled
1610 * by ast_function_expression::hir.
1615 case ast_identifier
: {
1616 /* ast_identifier can appear several places in a full abstract syntax
1617 * tree. This particular use must be at location specified in the grammar
1618 * as 'variable_identifier'.
1621 state
->symbols
->get_variable(this->primary_expression
.identifier
);
1623 result
= new(ctx
) ir_dereference_variable(var
);
1626 type
= result
->type
;
1628 _mesa_glsl_error(& loc
, state
, "`%s' undeclared",
1629 this->primary_expression
.identifier
);
1631 error_emitted
= true;
1636 case ast_int_constant
:
1637 type
= glsl_type::int_type
;
1638 result
= new(ctx
) ir_constant(this->primary_expression
.int_constant
);
1641 case ast_uint_constant
:
1642 type
= glsl_type::uint_type
;
1643 result
= new(ctx
) ir_constant(this->primary_expression
.uint_constant
);
1646 case ast_float_constant
:
1647 type
= glsl_type::float_type
;
1648 result
= new(ctx
) ir_constant(this->primary_expression
.float_constant
);
1651 case ast_bool_constant
:
1652 type
= glsl_type::bool_type
;
1653 result
= new(ctx
) ir_constant(bool(this->primary_expression
.bool_constant
));
1656 case ast_sequence
: {
1657 /* It should not be possible to generate a sequence in the AST without
1658 * any expressions in it.
1660 assert(!this->expressions
.is_empty());
1662 /* The r-value of a sequence is the last expression in the sequence. If
1663 * the other expressions in the sequence do not have side-effects (and
1664 * therefore add instructions to the instruction list), they get dropped
1667 foreach_list_typed (ast_node
, ast
, link
, &this->expressions
)
1668 result
= ast
->hir(instructions
, state
);
1670 type
= result
->type
;
1672 /* Any errors should have already been emitted in the loop above.
1674 error_emitted
= true;
1679 if (type
->is_error() && !error_emitted
)
1680 _mesa_glsl_error(& loc
, state
, "type mismatch");
1687 ast_expression_statement::hir(exec_list
*instructions
,
1688 struct _mesa_glsl_parse_state
*state
)
1690 /* It is possible to have expression statements that don't have an
1691 * expression. This is the solitary semicolon:
1693 * for (i = 0; i < 5; i++)
1696 * In this case the expression will be NULL. Test for NULL and don't do
1697 * anything in that case.
1699 if (expression
!= NULL
)
1700 expression
->hir(instructions
, state
);
1702 /* Statements do not have r-values.
1709 ast_compound_statement::hir(exec_list
*instructions
,
1710 struct _mesa_glsl_parse_state
*state
)
1713 state
->symbols
->push_scope();
1715 foreach_list_typed (ast_node
, ast
, link
, &this->statements
)
1716 ast
->hir(instructions
, state
);
1719 state
->symbols
->pop_scope();
1721 /* Compound statements do not have r-values.
1727 static const glsl_type
*
1728 process_array_type(YYLTYPE
*loc
, const glsl_type
*base
, ast_node
*array_size
,
1729 struct _mesa_glsl_parse_state
*state
)
1731 unsigned length
= 0;
1733 /* FINISHME: Reject delcarations of multidimensional arrays. */
1735 if (array_size
!= NULL
) {
1736 exec_list dummy_instructions
;
1737 ir_rvalue
*const ir
= array_size
->hir(& dummy_instructions
, state
);
1738 YYLTYPE loc
= array_size
->get_location();
1740 /* FINISHME: Verify that the grammar forbids side-effects in array
1741 * FINISHME: sizes. i.e., 'vec4 [x = 12] data'
1743 assert(dummy_instructions
.is_empty());
1746 if (!ir
->type
->is_integer()) {
1747 _mesa_glsl_error(& loc
, state
, "array size must be integer type");
1748 } else if (!ir
->type
->is_scalar()) {
1749 _mesa_glsl_error(& loc
, state
, "array size must be scalar type");
1751 ir_constant
*const size
= ir
->constant_expression_value();
1754 _mesa_glsl_error(& loc
, state
, "array size must be a "
1755 "constant valued expression");
1756 } else if (size
->value
.i
[0] <= 0) {
1757 _mesa_glsl_error(& loc
, state
, "array size must be > 0");
1759 assert(size
->type
== ir
->type
);
1760 length
= size
->value
.u
[0];
1764 } else if (state
->es_shader
) {
1765 /* Section 10.17 of the GLSL ES 1.00 specification states that unsized
1766 * array declarations have been removed from the language.
1768 _mesa_glsl_error(loc
, state
, "unsized array declarations are not "
1769 "allowed in GLSL ES 1.00.");
1772 return glsl_type::get_array_instance(base
, length
);
1777 ast_type_specifier::glsl_type(const char **name
,
1778 struct _mesa_glsl_parse_state
*state
) const
1780 const struct glsl_type
*type
;
1782 type
= state
->symbols
->get_type(this->type_name
);
1783 *name
= this->type_name
;
1785 if (this->is_array
) {
1786 YYLTYPE loc
= this->get_location();
1787 type
= process_array_type(&loc
, type
, this->array_size
, state
);
1795 apply_type_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
1797 struct _mesa_glsl_parse_state
*state
,
1800 if (qual
->flags
.q
.invariant
)
1803 /* FINISHME: Mark 'in' variables at global scope as read-only. */
1804 if (qual
->flags
.q
.constant
|| qual
->flags
.q
.attribute
1805 || qual
->flags
.q
.uniform
1806 || (qual
->flags
.q
.varying
&& (state
->target
== fragment_shader
)))
1809 if (qual
->flags
.q
.centroid
)
1812 if (qual
->flags
.q
.attribute
&& state
->target
!= vertex_shader
) {
1813 var
->type
= glsl_type::error_type
;
1814 _mesa_glsl_error(loc
, state
,
1815 "`attribute' variables may not be declared in the "
1817 _mesa_glsl_shader_target_name(state
->target
));
1820 /* From page 25 (page 31 of the PDF) of the GLSL 1.10 spec:
1822 * "The varying qualifier can be used only with the data types
1823 * float, vec2, vec3, vec4, mat2, mat3, and mat4, or arrays of
1826 if (qual
->flags
.q
.varying
) {
1827 const glsl_type
*non_array_type
;
1829 if (var
->type
&& var
->type
->is_array())
1830 non_array_type
= var
->type
->fields
.array
;
1832 non_array_type
= var
->type
;
1834 if (non_array_type
&& non_array_type
->base_type
!= GLSL_TYPE_FLOAT
) {
1835 var
->type
= glsl_type::error_type
;
1836 _mesa_glsl_error(loc
, state
,
1837 "varying variables must be of base type float");
1841 /* If there is no qualifier that changes the mode of the variable, leave
1842 * the setting alone.
1844 if (qual
->flags
.q
.in
&& qual
->flags
.q
.out
)
1845 var
->mode
= ir_var_inout
;
1846 else if (qual
->flags
.q
.attribute
|| qual
->flags
.q
.in
1847 || (qual
->flags
.q
.varying
&& (state
->target
== fragment_shader
)))
1848 var
->mode
= ir_var_in
;
1849 else if (qual
->flags
.q
.out
1850 || (qual
->flags
.q
.varying
&& (state
->target
== vertex_shader
)))
1851 var
->mode
= ir_var_out
;
1852 else if (qual
->flags
.q
.uniform
)
1853 var
->mode
= ir_var_uniform
;
1855 if (state
->all_invariant
&& (state
->current_function
== NULL
)) {
1856 switch (state
->target
) {
1858 if (var
->mode
== ir_var_out
)
1859 var
->invariant
= true;
1861 case geometry_shader
:
1862 if ((var
->mode
== ir_var_in
) || (var
->mode
== ir_var_out
))
1863 var
->invariant
= true;
1865 case fragment_shader
:
1866 if (var
->mode
== ir_var_in
)
1867 var
->invariant
= true;
1872 if (qual
->flags
.q
.flat
)
1873 var
->interpolation
= ir_var_flat
;
1874 else if (qual
->flags
.q
.noperspective
)
1875 var
->interpolation
= ir_var_noperspective
;
1877 var
->interpolation
= ir_var_smooth
;
1879 var
->pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
1880 var
->origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
1881 if ((qual
->flags
.q
.origin_upper_left
|| qual
->flags
.q
.pixel_center_integer
)
1882 && (strcmp(var
->name
, "gl_FragCoord") != 0)) {
1883 const char *const qual_string
= (qual
->flags
.q
.origin_upper_left
)
1884 ? "origin_upper_left" : "pixel_center_integer";
1886 _mesa_glsl_error(loc
, state
,
1887 "layout qualifier `%s' can only be applied to "
1888 "fragment shader input `gl_FragCoord'",
1892 if (qual
->flags
.q
.explicit_location
) {
1893 const bool global_scope
= (state
->current_function
== NULL
);
1895 const char *string
= "";
1897 /* In the vertex shader only shader inputs can be given explicit
1900 * In the fragment shader only shader outputs can be given explicit
1903 switch (state
->target
) {
1905 if (!global_scope
|| (var
->mode
!= ir_var_in
)) {
1911 case geometry_shader
:
1912 _mesa_glsl_error(loc
, state
,
1913 "geometry shader variables cannot be given "
1914 "explicit locations\n");
1917 case fragment_shader
:
1918 if (!global_scope
|| (var
->mode
!= ir_var_in
)) {
1926 _mesa_glsl_error(loc
, state
,
1927 "only %s shader %s variables can be given an "
1928 "explicit location\n",
1929 _mesa_glsl_shader_target_name(state
->target
),
1932 var
->explicit_location
= true;
1934 /* This bit of silliness is needed because invalid explicit locations
1935 * are supposed to be flagged during linking. Small negative values
1936 * biased by VERT_ATTRIB_GENERIC0 or FRAG_RESULT_DATA0 could alias
1937 * built-in values (e.g., -16+VERT_ATTRIB_GENERIC0 = VERT_ATTRIB_POS).
1938 * The linker needs to be able to differentiate these cases. This
1939 * ensures that negative values stay negative.
1941 if (qual
->location
>= 0) {
1942 var
->location
= (state
->target
== vertex_shader
)
1943 ? (qual
->location
+ VERT_ATTRIB_GENERIC0
)
1944 : (qual
->location
+ FRAG_RESULT_DATA0
);
1946 var
->location
= qual
->location
;
1951 if (var
->type
->is_array() && state
->language_version
!= 110) {
1952 var
->array_lvalue
= true;
1958 ast_declarator_list::hir(exec_list
*instructions
,
1959 struct _mesa_glsl_parse_state
*state
)
1962 const struct glsl_type
*decl_type
;
1963 const char *type_name
= NULL
;
1964 ir_rvalue
*result
= NULL
;
1965 YYLTYPE loc
= this->get_location();
1967 /* From page 46 (page 52 of the PDF) of the GLSL 1.50 spec:
1969 * "To ensure that a particular output variable is invariant, it is
1970 * necessary to use the invariant qualifier. It can either be used to
1971 * qualify a previously declared variable as being invariant
1973 * invariant gl_Position; // make existing gl_Position be invariant"
1975 * In these cases the parser will set the 'invariant' flag in the declarator
1976 * list, and the type will be NULL.
1978 if (this->invariant
) {
1979 assert(this->type
== NULL
);
1981 if (state
->current_function
!= NULL
) {
1982 _mesa_glsl_error(& loc
, state
,
1983 "All uses of `invariant' keyword must be at global "
1987 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
1988 assert(!decl
->is_array
);
1989 assert(decl
->array_size
== NULL
);
1990 assert(decl
->initializer
== NULL
);
1992 ir_variable
*const earlier
=
1993 state
->symbols
->get_variable(decl
->identifier
);
1994 if (earlier
== NULL
) {
1995 _mesa_glsl_error(& loc
, state
,
1996 "Undeclared variable `%s' cannot be marked "
1997 "invariant\n", decl
->identifier
);
1998 } else if ((state
->target
== vertex_shader
)
1999 && (earlier
->mode
!= ir_var_out
)) {
2000 _mesa_glsl_error(& loc
, state
,
2001 "`%s' cannot be marked invariant, vertex shader "
2002 "outputs only\n", decl
->identifier
);
2003 } else if ((state
->target
== fragment_shader
)
2004 && (earlier
->mode
!= ir_var_in
)) {
2005 _mesa_glsl_error(& loc
, state
,
2006 "`%s' cannot be marked invariant, fragment shader "
2007 "inputs only\n", decl
->identifier
);
2009 earlier
->invariant
= true;
2013 /* Invariant redeclarations do not have r-values.
2018 assert(this->type
!= NULL
);
2019 assert(!this->invariant
);
2021 /* The type specifier may contain a structure definition. Process that
2022 * before any of the variable declarations.
2024 (void) this->type
->specifier
->hir(instructions
, state
);
2026 decl_type
= this->type
->specifier
->glsl_type(& type_name
, state
);
2027 if (this->declarations
.is_empty()) {
2028 /* The only valid case where the declaration list can be empty is when
2029 * the declaration is setting the default precision of a built-in type
2030 * (e.g., 'precision highp vec4;').
2033 if (decl_type
!= NULL
) {
2035 _mesa_glsl_error(& loc
, state
, "incomplete declaration");
2039 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
2040 const struct glsl_type
*var_type
;
2043 /* FINISHME: Emit a warning if a variable declaration shadows a
2044 * FINISHME: declaration at a higher scope.
2047 if ((decl_type
== NULL
) || decl_type
->is_void()) {
2048 if (type_name
!= NULL
) {
2049 _mesa_glsl_error(& loc
, state
,
2050 "invalid type `%s' in declaration of `%s'",
2051 type_name
, decl
->identifier
);
2053 _mesa_glsl_error(& loc
, state
,
2054 "invalid type in declaration of `%s'",
2060 if (decl
->is_array
) {
2061 var_type
= process_array_type(&loc
, decl_type
, decl
->array_size
,
2064 var_type
= decl_type
;
2067 var
= new(ctx
) ir_variable(var_type
, decl
->identifier
, ir_var_auto
);
2069 /* From page 22 (page 28 of the PDF) of the GLSL 1.10 specification;
2071 * "Global variables can only use the qualifiers const,
2072 * attribute, uni form, or varying. Only one may be
2075 * Local variables can only use the qualifier const."
2077 * This is relaxed in GLSL 1.30.
2079 if (state
->language_version
< 120) {
2080 if (this->type
->qualifier
.flags
.q
.out
) {
2081 _mesa_glsl_error(& loc
, state
,
2082 "`out' qualifier in declaration of `%s' "
2083 "only valid for function parameters in GLSL 1.10.",
2086 if (this->type
->qualifier
.flags
.q
.in
) {
2087 _mesa_glsl_error(& loc
, state
,
2088 "`in' qualifier in declaration of `%s' "
2089 "only valid for function parameters in GLSL 1.10.",
2092 /* FINISHME: Test for other invalid qualifiers. */
2095 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
,
2098 if (this->type
->qualifier
.flags
.q
.invariant
) {
2099 if ((state
->target
== vertex_shader
) && !(var
->mode
== ir_var_out
||
2100 var
->mode
== ir_var_inout
)) {
2101 /* FINISHME: Note that this doesn't work for invariant on
2102 * a function signature outval
2104 _mesa_glsl_error(& loc
, state
,
2105 "`%s' cannot be marked invariant, vertex shader "
2106 "outputs only\n", var
->name
);
2107 } else if ((state
->target
== fragment_shader
) &&
2108 !(var
->mode
== ir_var_in
|| var
->mode
== ir_var_inout
)) {
2109 /* FINISHME: Note that this doesn't work for invariant on
2110 * a function signature inval
2112 _mesa_glsl_error(& loc
, state
,
2113 "`%s' cannot be marked invariant, fragment shader "
2114 "inputs only\n", var
->name
);
2118 if (state
->current_function
!= NULL
) {
2119 const char *mode
= NULL
;
2120 const char *extra
= "";
2122 /* There is no need to check for 'inout' here because the parser will
2123 * only allow that in function parameter lists.
2125 if (this->type
->qualifier
.flags
.q
.attribute
) {
2127 } else if (this->type
->qualifier
.flags
.q
.uniform
) {
2129 } else if (this->type
->qualifier
.flags
.q
.varying
) {
2131 } else if (this->type
->qualifier
.flags
.q
.in
) {
2133 extra
= " or in function parameter list";
2134 } else if (this->type
->qualifier
.flags
.q
.out
) {
2136 extra
= " or in function parameter list";
2140 _mesa_glsl_error(& loc
, state
,
2141 "%s variable `%s' must be declared at "
2143 mode
, var
->name
, extra
);
2145 } else if (var
->mode
== ir_var_in
) {
2146 if (state
->target
== vertex_shader
) {
2147 bool error_emitted
= false;
2149 /* From page 31 (page 37 of the PDF) of the GLSL 1.50 spec:
2151 * "Vertex shader inputs can only be float, floating-point
2152 * vectors, matrices, signed and unsigned integers and integer
2153 * vectors. Vertex shader inputs can also form arrays of these
2154 * types, but not structures."
2156 * From page 31 (page 27 of the PDF) of the GLSL 1.30 spec:
2158 * "Vertex shader inputs can only be float, floating-point
2159 * vectors, matrices, signed and unsigned integers and integer
2160 * vectors. They cannot be arrays or structures."
2162 * From page 23 (page 29 of the PDF) of the GLSL 1.20 spec:
2164 * "The attribute qualifier can be used only with float,
2165 * floating-point vectors, and matrices. Attribute variables
2166 * cannot be declared as arrays or structures."
2168 const glsl_type
*check_type
= var
->type
->is_array()
2169 ? var
->type
->fields
.array
: var
->type
;
2171 switch (check_type
->base_type
) {
2172 case GLSL_TYPE_FLOAT
:
2174 case GLSL_TYPE_UINT
:
2176 if (state
->language_version
> 120)
2180 _mesa_glsl_error(& loc
, state
,
2181 "vertex shader input / attribute cannot have "
2183 var
->type
->is_array() ? "array of " : "",
2185 error_emitted
= true;
2188 if (!error_emitted
&& (state
->language_version
<= 130)
2189 && var
->type
->is_array()) {
2190 _mesa_glsl_error(& loc
, state
,
2191 "vertex shader input / attribute cannot have "
2193 error_emitted
= true;
2198 /* Integer vertex outputs must be qualified with 'flat'.
2200 * From section 4.3.6 of the GLSL 1.30 spec:
2201 * "If a vertex output is a signed or unsigned integer or integer
2202 * vector, then it must be qualified with the interpolation qualifier
2205 if (state
->language_version
>= 130
2206 && state
->target
== vertex_shader
2207 && state
->current_function
== NULL
2208 && var
->type
->is_integer()
2209 && var
->mode
== ir_var_out
2210 && var
->interpolation
!= ir_var_flat
) {
2212 _mesa_glsl_error(&loc
, state
, "If a vertex output is an integer, "
2213 "then it must be qualified with 'flat'");
2217 /* Process the initializer and add its instructions to a temporary
2218 * list. This list will be added to the instruction stream (below) after
2219 * the declaration is added. This is done because in some cases (such as
2220 * redeclarations) the declaration may not actually be added to the
2221 * instruction stream.
2223 exec_list initializer_instructions
;
2224 if (decl
->initializer
!= NULL
) {
2225 YYLTYPE initializer_loc
= decl
->initializer
->get_location();
2227 /* From page 24 (page 30 of the PDF) of the GLSL 1.10 spec:
2229 * "All uniform variables are read-only and are initialized either
2230 * directly by an application via API commands, or indirectly by
2233 if ((state
->language_version
<= 110)
2234 && (var
->mode
== ir_var_uniform
)) {
2235 _mesa_glsl_error(& initializer_loc
, state
,
2236 "cannot initialize uniforms in GLSL 1.10");
2239 if (var
->type
->is_sampler()) {
2240 _mesa_glsl_error(& initializer_loc
, state
,
2241 "cannot initialize samplers");
2244 if ((var
->mode
== ir_var_in
) && (state
->current_function
== NULL
)) {
2245 _mesa_glsl_error(& initializer_loc
, state
,
2246 "cannot initialize %s shader input / %s",
2247 _mesa_glsl_shader_target_name(state
->target
),
2248 (state
->target
== vertex_shader
)
2249 ? "attribute" : "varying");
2252 ir_dereference
*const lhs
= new(ctx
) ir_dereference_variable(var
);
2253 ir_rvalue
*rhs
= decl
->initializer
->hir(&initializer_instructions
,
2256 /* Calculate the constant value if this is a const or uniform
2259 if (this->type
->qualifier
.flags
.q
.constant
2260 || this->type
->qualifier
.flags
.q
.uniform
) {
2261 ir_rvalue
*new_rhs
= validate_assignment(state
, var
->type
, rhs
);
2262 if (new_rhs
!= NULL
) {
2265 ir_constant
*constant_value
= rhs
->constant_expression_value();
2266 if (!constant_value
) {
2267 _mesa_glsl_error(& initializer_loc
, state
,
2268 "initializer of %s variable `%s' must be a "
2269 "constant expression",
2270 (this->type
->qualifier
.flags
.q
.constant
)
2271 ? "const" : "uniform",
2273 if (var
->type
->is_numeric()) {
2274 /* Reduce cascading errors. */
2275 var
->constant_value
= ir_constant::zero(ctx
, var
->type
);
2278 rhs
= constant_value
;
2279 var
->constant_value
= constant_value
;
2282 _mesa_glsl_error(&initializer_loc
, state
,
2283 "initializer of type %s cannot be assigned to "
2284 "variable of type %s",
2285 rhs
->type
->name
, var
->type
->name
);
2286 if (var
->type
->is_numeric()) {
2287 /* Reduce cascading errors. */
2288 var
->constant_value
= ir_constant::zero(ctx
, var
->type
);
2293 if (rhs
&& !rhs
->type
->is_error()) {
2294 bool temp
= var
->read_only
;
2295 if (this->type
->qualifier
.flags
.q
.constant
)
2296 var
->read_only
= false;
2298 /* Never emit code to initialize a uniform.
2300 const glsl_type
*initializer_type
;
2301 if (!this->type
->qualifier
.flags
.q
.uniform
) {
2302 result
= do_assignment(&initializer_instructions
, state
,
2304 this->get_location());
2305 initializer_type
= result
->type
;
2307 initializer_type
= rhs
->type
;
2309 /* If the declared variable is an unsized array, it must inherrit
2310 * its full type from the initializer. A declaration such as
2312 * uniform float a[] = float[](1.0, 2.0, 3.0, 3.0);
2316 * uniform float a[4] = float[](1.0, 2.0, 3.0, 3.0);
2318 * The assignment generated in the if-statement (below) will also
2319 * automatically handle this case for non-uniforms.
2321 * If the declared variable is not an array, the types must
2322 * already match exactly. As a result, the type assignment
2323 * here can be done unconditionally. For non-uniforms the call
2324 * to do_assignment can change the type of the initializer (via
2325 * the implicit conversion rules). For uniforms the initializer
2326 * must be a constant expression, and the type of that expression
2327 * was validated above.
2329 var
->type
= initializer_type
;
2331 var
->read_only
= temp
;
2335 /* From page 23 (page 29 of the PDF) of the GLSL 1.10 spec:
2337 * "It is an error to write to a const variable outside of
2338 * its declaration, so they must be initialized when
2341 if (this->type
->qualifier
.flags
.q
.constant
&& decl
->initializer
== NULL
) {
2342 _mesa_glsl_error(& loc
, state
,
2343 "const declaration of `%s' must be initialized");
2346 /* Check if this declaration is actually a re-declaration, either to
2347 * resize an array or add qualifiers to an existing variable.
2349 * This is allowed for variables in the current scope, or when at
2350 * global scope (for built-ins in the implicit outer scope).
2352 ir_variable
*earlier
= state
->symbols
->get_variable(decl
->identifier
);
2353 if (earlier
!= NULL
&& (state
->current_function
== NULL
||
2354 state
->symbols
->name_declared_this_scope(decl
->identifier
))) {
2356 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec,
2358 * "It is legal to declare an array without a size and then
2359 * later re-declare the same name as an array of the same
2360 * type and specify a size."
2362 if ((earlier
->type
->array_size() == 0)
2363 && var
->type
->is_array()
2364 && (var
->type
->element_type() == earlier
->type
->element_type())) {
2365 /* FINISHME: This doesn't match the qualifiers on the two
2366 * FINISHME: declarations. It's not 100% clear whether this is
2367 * FINISHME: required or not.
2370 /* From page 54 (page 60 of the PDF) of the GLSL 1.20 spec:
2372 * "The size [of gl_TexCoord] can be at most
2373 * gl_MaxTextureCoords."
2375 const unsigned size
= unsigned(var
->type
->array_size());
2376 if ((strcmp("gl_TexCoord", var
->name
) == 0)
2377 && (size
> state
->Const
.MaxTextureCoords
)) {
2378 YYLTYPE loc
= this->get_location();
2380 _mesa_glsl_error(& loc
, state
, "`gl_TexCoord' array size cannot "
2381 "be larger than gl_MaxTextureCoords (%u)\n",
2382 state
->Const
.MaxTextureCoords
);
2383 } else if ((size
> 0) && (size
<= earlier
->max_array_access
)) {
2384 YYLTYPE loc
= this->get_location();
2386 _mesa_glsl_error(& loc
, state
, "array size must be > %u due to "
2388 earlier
->max_array_access
);
2391 earlier
->type
= var
->type
;
2394 } else if (state
->ARB_fragment_coord_conventions_enable
2395 && strcmp(var
->name
, "gl_FragCoord") == 0
2396 && earlier
->type
== var
->type
2397 && earlier
->mode
== var
->mode
) {
2398 /* Allow redeclaration of gl_FragCoord for ARB_fcc layout
2401 earlier
->origin_upper_left
= var
->origin_upper_left
;
2402 earlier
->pixel_center_integer
= var
->pixel_center_integer
;
2404 /* According to section 4.3.7 of the GLSL 1.30 spec,
2405 * the following built-in varaibles can be redeclared with an
2406 * interpolation qualifier:
2409 * * gl_FrontSecondaryColor
2410 * * gl_BackSecondaryColor
2412 * * gl_SecondaryColor
2414 } else if (state
->language_version
>= 130
2415 && (strcmp(var
->name
, "gl_FrontColor") == 0
2416 || strcmp(var
->name
, "gl_BackColor") == 0
2417 || strcmp(var
->name
, "gl_FrontSecondaryColor") == 0
2418 || strcmp(var
->name
, "gl_BackSecondaryColor") == 0
2419 || strcmp(var
->name
, "gl_Color") == 0
2420 || strcmp(var
->name
, "gl_SecondaryColor") == 0)
2421 && earlier
->type
== var
->type
2422 && earlier
->mode
== var
->mode
) {
2423 earlier
->interpolation
= var
->interpolation
;
2425 YYLTYPE loc
= this->get_location();
2426 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", decl
->identifier
);
2432 /* By now, we know it's a new variable declaration (we didn't hit the
2433 * above "continue").
2435 * From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
2437 * "Identifiers starting with "gl_" are reserved for use by
2438 * OpenGL, and may not be declared in a shader as either a
2439 * variable or a function."
2441 if (strncmp(decl
->identifier
, "gl_", 3) == 0)
2442 _mesa_glsl_error(& loc
, state
,
2443 "identifier `%s' uses reserved `gl_' prefix",
2446 /* Add the variable to the symbol table. Note that the initializer's
2447 * IR was already processed earlier (though it hasn't been emitted yet),
2448 * without the variable in scope.
2450 * This differs from most C-like languages, but it follows the GLSL
2451 * specification. From page 28 (page 34 of the PDF) of the GLSL 1.50
2454 * "Within a declaration, the scope of a name starts immediately
2455 * after the initializer if present or immediately after the name
2456 * being declared if not."
2458 if (!state
->symbols
->add_variable(var
)) {
2459 YYLTYPE loc
= this->get_location();
2460 _mesa_glsl_error(&loc
, state
, "name `%s' already taken in the "
2461 "current scope", decl
->identifier
);
2465 /* Push the variable declaration to the top. It means that all
2466 * the variable declarations will appear in a funny
2467 * last-to-first order, but otherwise we run into trouble if a
2468 * function is prototyped, a global var is decled, then the
2469 * function is defined with usage of the global var. See
2470 * glslparsertest's CorrectModule.frag.
2472 instructions
->push_head(var
);
2473 instructions
->append_list(&initializer_instructions
);
2477 /* Generally, variable declarations do not have r-values. However,
2478 * one is used for the declaration in
2480 * while (bool b = some_condition()) {
2484 * so we return the rvalue from the last seen declaration here.
2491 ast_parameter_declarator::hir(exec_list
*instructions
,
2492 struct _mesa_glsl_parse_state
*state
)
2495 const struct glsl_type
*type
;
2496 const char *name
= NULL
;
2497 YYLTYPE loc
= this->get_location();
2499 type
= this->type
->specifier
->glsl_type(& name
, state
);
2503 _mesa_glsl_error(& loc
, state
,
2504 "invalid type `%s' in declaration of `%s'",
2505 name
, this->identifier
);
2507 _mesa_glsl_error(& loc
, state
,
2508 "invalid type in declaration of `%s'",
2512 type
= glsl_type::error_type
;
2515 /* From page 62 (page 68 of the PDF) of the GLSL 1.50 spec:
2517 * "Functions that accept no input arguments need not use void in the
2518 * argument list because prototypes (or definitions) are required and
2519 * therefore there is no ambiguity when an empty argument list "( )" is
2520 * declared. The idiom "(void)" as a parameter list is provided for
2523 * Placing this check here prevents a void parameter being set up
2524 * for a function, which avoids tripping up checks for main taking
2525 * parameters and lookups of an unnamed symbol.
2527 if (type
->is_void()) {
2528 if (this->identifier
!= NULL
)
2529 _mesa_glsl_error(& loc
, state
,
2530 "named parameter cannot have type `void'");
2536 if (formal_parameter
&& (this->identifier
== NULL
)) {
2537 _mesa_glsl_error(& loc
, state
, "formal parameter lacks a name");
2541 /* This only handles "vec4 foo[..]". The earlier specifier->glsl_type(...)
2542 * call already handled the "vec4[..] foo" case.
2544 if (this->is_array
) {
2545 type
= process_array_type(&loc
, type
, this->array_size
, state
);
2548 if (type
->array_size() == 0) {
2549 _mesa_glsl_error(&loc
, state
, "arrays passed as parameters must have "
2550 "a declared size.");
2551 type
= glsl_type::error_type
;
2555 ir_variable
*var
= new(ctx
) ir_variable(type
, this->identifier
, ir_var_in
);
2557 /* Apply any specified qualifiers to the parameter declaration. Note that
2558 * for function parameters the default mode is 'in'.
2560 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
, & loc
);
2562 instructions
->push_tail(var
);
2564 /* Parameter declarations do not have r-values.
2571 ast_parameter_declarator::parameters_to_hir(exec_list
*ast_parameters
,
2573 exec_list
*ir_parameters
,
2574 _mesa_glsl_parse_state
*state
)
2576 ast_parameter_declarator
*void_param
= NULL
;
2579 foreach_list_typed (ast_parameter_declarator
, param
, link
, ast_parameters
) {
2580 param
->formal_parameter
= formal
;
2581 param
->hir(ir_parameters
, state
);
2589 if ((void_param
!= NULL
) && (count
> 1)) {
2590 YYLTYPE loc
= void_param
->get_location();
2592 _mesa_glsl_error(& loc
, state
,
2593 "`void' parameter must be only parameter");
2599 emit_function(_mesa_glsl_parse_state
*state
, exec_list
*instructions
,
2602 /* Emit the new function header */
2603 if (state
->current_function
== NULL
) {
2604 instructions
->push_tail(f
);
2606 /* IR invariants disallow function declarations or definitions nested
2607 * within other function definitions. Insert the new ir_function
2608 * block in the instruction sequence before the ir_function block
2609 * containing the current ir_function_signature.
2611 ir_function
*const curr
=
2612 const_cast<ir_function
*>(state
->current_function
->function());
2614 curr
->insert_before(f
);
2620 ast_function::hir(exec_list
*instructions
,
2621 struct _mesa_glsl_parse_state
*state
)
2624 ir_function
*f
= NULL
;
2625 ir_function_signature
*sig
= NULL
;
2626 exec_list hir_parameters
;
2628 const char *const name
= identifier
;
2630 /* From page 21 (page 27 of the PDF) of the GLSL 1.20 spec,
2632 * "Function declarations (prototypes) cannot occur inside of functions;
2633 * they must be at global scope, or for the built-in functions, outside
2634 * the global scope."
2636 * From page 27 (page 33 of the PDF) of the GLSL ES 1.00.16 spec,
2638 * "User defined functions may only be defined within the global scope."
2640 * Note that this language does not appear in GLSL 1.10.
2642 if ((state
->current_function
!= NULL
) && (state
->language_version
!= 110)) {
2643 YYLTYPE loc
= this->get_location();
2644 _mesa_glsl_error(&loc
, state
,
2645 "declaration of function `%s' not allowed within "
2646 "function body", name
);
2649 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
2651 * "Identifiers starting with "gl_" are reserved for use by
2652 * OpenGL, and may not be declared in a shader as either a
2653 * variable or a function."
2655 if (strncmp(name
, "gl_", 3) == 0) {
2656 YYLTYPE loc
= this->get_location();
2657 _mesa_glsl_error(&loc
, state
,
2658 "identifier `%s' uses reserved `gl_' prefix", name
);
2661 /* Convert the list of function parameters to HIR now so that they can be
2662 * used below to compare this function's signature with previously seen
2663 * signatures for functions with the same name.
2665 ast_parameter_declarator::parameters_to_hir(& this->parameters
,
2667 & hir_parameters
, state
);
2669 const char *return_type_name
;
2670 const glsl_type
*return_type
=
2671 this->return_type
->specifier
->glsl_type(& return_type_name
, state
);
2674 YYLTYPE loc
= this->get_location();
2675 _mesa_glsl_error(&loc
, state
,
2676 "function `%s' has undeclared return type `%s'",
2677 name
, return_type_name
);
2678 return_type
= glsl_type::error_type
;
2681 /* From page 56 (page 62 of the PDF) of the GLSL 1.30 spec:
2682 * "No qualifier is allowed on the return type of a function."
2684 if (this->return_type
->has_qualifiers()) {
2685 YYLTYPE loc
= this->get_location();
2686 _mesa_glsl_error(& loc
, state
,
2687 "function `%s' return type has qualifiers", name
);
2690 /* Verify that this function's signature either doesn't match a previously
2691 * seen signature for a function with the same name, or, if a match is found,
2692 * that the previously seen signature does not have an associated definition.
2694 f
= state
->symbols
->get_function(name
);
2695 if (f
!= NULL
&& (state
->es_shader
|| f
->has_user_signature())) {
2696 sig
= f
->exact_matching_signature(&hir_parameters
);
2698 const char *badvar
= sig
->qualifiers_match(&hir_parameters
);
2699 if (badvar
!= NULL
) {
2700 YYLTYPE loc
= this->get_location();
2702 _mesa_glsl_error(&loc
, state
, "function `%s' parameter `%s' "
2703 "qualifiers don't match prototype", name
, badvar
);
2706 if (sig
->return_type
!= return_type
) {
2707 YYLTYPE loc
= this->get_location();
2709 _mesa_glsl_error(&loc
, state
, "function `%s' return type doesn't "
2710 "match prototype", name
);
2713 if (is_definition
&& sig
->is_defined
) {
2714 YYLTYPE loc
= this->get_location();
2716 _mesa_glsl_error(& loc
, state
, "function `%s' redefined", name
);
2720 f
= new(ctx
) ir_function(name
);
2721 if (!state
->symbols
->add_function(f
)) {
2722 /* This function name shadows a non-function use of the same name. */
2723 YYLTYPE loc
= this->get_location();
2725 _mesa_glsl_error(&loc
, state
, "function name `%s' conflicts with "
2726 "non-function", name
);
2730 emit_function(state
, instructions
, f
);
2733 /* Verify the return type of main() */
2734 if (strcmp(name
, "main") == 0) {
2735 if (! return_type
->is_void()) {
2736 YYLTYPE loc
= this->get_location();
2738 _mesa_glsl_error(& loc
, state
, "main() must return void");
2741 if (!hir_parameters
.is_empty()) {
2742 YYLTYPE loc
= this->get_location();
2744 _mesa_glsl_error(& loc
, state
, "main() must not take any parameters");
2748 /* Finish storing the information about this new function in its signature.
2751 sig
= new(ctx
) ir_function_signature(return_type
);
2752 f
->add_signature(sig
);
2755 sig
->replace_parameters(&hir_parameters
);
2758 /* Function declarations (prototypes) do not have r-values.
2765 ast_function_definition::hir(exec_list
*instructions
,
2766 struct _mesa_glsl_parse_state
*state
)
2768 prototype
->is_definition
= true;
2769 prototype
->hir(instructions
, state
);
2771 ir_function_signature
*signature
= prototype
->signature
;
2772 if (signature
== NULL
)
2775 assert(state
->current_function
== NULL
);
2776 state
->current_function
= signature
;
2777 state
->found_return
= false;
2779 /* Duplicate parameters declared in the prototype as concrete variables.
2780 * Add these to the symbol table.
2782 state
->symbols
->push_scope();
2783 foreach_iter(exec_list_iterator
, iter
, signature
->parameters
) {
2784 ir_variable
*const var
= ((ir_instruction
*) iter
.get())->as_variable();
2786 assert(var
!= NULL
);
2788 /* The only way a parameter would "exist" is if two parameters have
2791 if (state
->symbols
->name_declared_this_scope(var
->name
)) {
2792 YYLTYPE loc
= this->get_location();
2794 _mesa_glsl_error(& loc
, state
, "parameter `%s' redeclared", var
->name
);
2796 state
->symbols
->add_variable(var
);
2800 /* Convert the body of the function to HIR. */
2801 this->body
->hir(&signature
->body
, state
);
2802 signature
->is_defined
= true;
2804 state
->symbols
->pop_scope();
2806 assert(state
->current_function
== signature
);
2807 state
->current_function
= NULL
;
2809 if (!signature
->return_type
->is_void() && !state
->found_return
) {
2810 YYLTYPE loc
= this->get_location();
2811 _mesa_glsl_error(& loc
, state
, "function `%s' has non-void return type "
2812 "%s, but no return statement",
2813 signature
->function_name(),
2814 signature
->return_type
->name
);
2817 /* Function definitions do not have r-values.
2824 ast_jump_statement::hir(exec_list
*instructions
,
2825 struct _mesa_glsl_parse_state
*state
)
2832 assert(state
->current_function
);
2834 if (opt_return_value
) {
2835 if (state
->current_function
->return_type
->base_type
==
2837 YYLTYPE loc
= this->get_location();
2839 _mesa_glsl_error(& loc
, state
,
2840 "`return` with a value, in function `%s' "
2842 state
->current_function
->function_name());
2845 ir_rvalue
*const ret
= opt_return_value
->hir(instructions
, state
);
2846 assert(ret
!= NULL
);
2848 /* Implicit conversions are not allowed for return values. */
2849 if (state
->current_function
->return_type
!= ret
->type
) {
2850 YYLTYPE loc
= this->get_location();
2852 _mesa_glsl_error(& loc
, state
,
2853 "`return' with wrong type %s, in function `%s' "
2856 state
->current_function
->function_name(),
2857 state
->current_function
->return_type
->name
);
2860 inst
= new(ctx
) ir_return(ret
);
2862 if (state
->current_function
->return_type
->base_type
!=
2864 YYLTYPE loc
= this->get_location();
2866 _mesa_glsl_error(& loc
, state
,
2867 "`return' with no value, in function %s returning "
2869 state
->current_function
->function_name());
2871 inst
= new(ctx
) ir_return
;
2874 state
->found_return
= true;
2875 instructions
->push_tail(inst
);
2880 if (state
->target
!= fragment_shader
) {
2881 YYLTYPE loc
= this->get_location();
2883 _mesa_glsl_error(& loc
, state
,
2884 "`discard' may only appear in a fragment shader");
2886 instructions
->push_tail(new(ctx
) ir_discard
);
2891 /* FINISHME: Handle switch-statements. They cannot contain 'continue',
2892 * FINISHME: and they use a different IR instruction for 'break'.
2894 /* FINISHME: Correctly handle the nesting. If a switch-statement is
2895 * FINISHME: inside a loop, a 'continue' is valid and will bind to the
2898 if (state
->loop_or_switch_nesting
== NULL
) {
2899 YYLTYPE loc
= this->get_location();
2901 _mesa_glsl_error(& loc
, state
,
2902 "`%s' may only appear in a loop",
2903 (mode
== ast_break
) ? "break" : "continue");
2905 ir_loop
*const loop
= state
->loop_or_switch_nesting
->as_loop();
2907 /* Inline the for loop expression again, since we don't know
2908 * where near the end of the loop body the normal copy of it
2909 * is going to be placed.
2911 if (mode
== ast_continue
&&
2912 state
->loop_or_switch_nesting_ast
->rest_expression
) {
2913 state
->loop_or_switch_nesting_ast
->rest_expression
->hir(instructions
,
2918 ir_loop_jump
*const jump
=
2919 new(ctx
) ir_loop_jump((mode
== ast_break
)
2920 ? ir_loop_jump::jump_break
2921 : ir_loop_jump::jump_continue
);
2922 instructions
->push_tail(jump
);
2929 /* Jump instructions do not have r-values.
2936 ast_selection_statement::hir(exec_list
*instructions
,
2937 struct _mesa_glsl_parse_state
*state
)
2941 ir_rvalue
*const condition
= this->condition
->hir(instructions
, state
);
2943 /* From page 66 (page 72 of the PDF) of the GLSL 1.50 spec:
2945 * "Any expression whose type evaluates to a Boolean can be used as the
2946 * conditional expression bool-expression. Vector types are not accepted
2947 * as the expression to if."
2949 * The checks are separated so that higher quality diagnostics can be
2950 * generated for cases where both rules are violated.
2952 if (!condition
->type
->is_boolean() || !condition
->type
->is_scalar()) {
2953 YYLTYPE loc
= this->condition
->get_location();
2955 _mesa_glsl_error(& loc
, state
, "if-statement condition must be scalar "
2959 ir_if
*const stmt
= new(ctx
) ir_if(condition
);
2961 if (then_statement
!= NULL
) {
2962 state
->symbols
->push_scope();
2963 then_statement
->hir(& stmt
->then_instructions
, state
);
2964 state
->symbols
->pop_scope();
2967 if (else_statement
!= NULL
) {
2968 state
->symbols
->push_scope();
2969 else_statement
->hir(& stmt
->else_instructions
, state
);
2970 state
->symbols
->pop_scope();
2973 instructions
->push_tail(stmt
);
2975 /* if-statements do not have r-values.
2982 ast_iteration_statement::condition_to_hir(ir_loop
*stmt
,
2983 struct _mesa_glsl_parse_state
*state
)
2987 if (condition
!= NULL
) {
2988 ir_rvalue
*const cond
=
2989 condition
->hir(& stmt
->body_instructions
, state
);
2992 || !cond
->type
->is_boolean() || !cond
->type
->is_scalar()) {
2993 YYLTYPE loc
= condition
->get_location();
2995 _mesa_glsl_error(& loc
, state
,
2996 "loop condition must be scalar boolean");
2998 /* As the first code in the loop body, generate a block that looks
2999 * like 'if (!condition) break;' as the loop termination condition.
3001 ir_rvalue
*const not_cond
=
3002 new(ctx
) ir_expression(ir_unop_logic_not
, glsl_type::bool_type
, cond
,
3005 ir_if
*const if_stmt
= new(ctx
) ir_if(not_cond
);
3007 ir_jump
*const break_stmt
=
3008 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
3010 if_stmt
->then_instructions
.push_tail(break_stmt
);
3011 stmt
->body_instructions
.push_tail(if_stmt
);
3018 ast_iteration_statement::hir(exec_list
*instructions
,
3019 struct _mesa_glsl_parse_state
*state
)
3023 /* For-loops and while-loops start a new scope, but do-while loops do not.
3025 if (mode
!= ast_do_while
)
3026 state
->symbols
->push_scope();
3028 if (init_statement
!= NULL
)
3029 init_statement
->hir(instructions
, state
);
3031 ir_loop
*const stmt
= new(ctx
) ir_loop();
3032 instructions
->push_tail(stmt
);
3034 /* Track the current loop and / or switch-statement nesting.
3036 ir_instruction
*const nesting
= state
->loop_or_switch_nesting
;
3037 ast_iteration_statement
*nesting_ast
= state
->loop_or_switch_nesting_ast
;
3039 state
->loop_or_switch_nesting
= stmt
;
3040 state
->loop_or_switch_nesting_ast
= this;
3042 if (mode
!= ast_do_while
)
3043 condition_to_hir(stmt
, state
);
3046 body
->hir(& stmt
->body_instructions
, state
);
3048 if (rest_expression
!= NULL
)
3049 rest_expression
->hir(& stmt
->body_instructions
, state
);
3051 if (mode
== ast_do_while
)
3052 condition_to_hir(stmt
, state
);
3054 if (mode
!= ast_do_while
)
3055 state
->symbols
->pop_scope();
3057 /* Restore previous nesting before returning.
3059 state
->loop_or_switch_nesting
= nesting
;
3060 state
->loop_or_switch_nesting_ast
= nesting_ast
;
3062 /* Loops do not have r-values.
3069 ast_type_specifier::hir(exec_list
*instructions
,
3070 struct _mesa_glsl_parse_state
*state
)
3072 if (this->structure
!= NULL
)
3073 return this->structure
->hir(instructions
, state
);
3080 ast_struct_specifier::hir(exec_list
*instructions
,
3081 struct _mesa_glsl_parse_state
*state
)
3083 unsigned decl_count
= 0;
3085 /* Make an initial pass over the list of structure fields to determine how
3086 * many there are. Each element in this list is an ast_declarator_list.
3087 * This means that we actually need to count the number of elements in the
3088 * 'declarations' list in each of the elements.
3090 foreach_list_typed (ast_declarator_list
, decl_list
, link
,
3091 &this->declarations
) {
3092 foreach_list_const (decl_ptr
, & decl_list
->declarations
) {
3097 /* Allocate storage for the structure fields and process the field
3098 * declarations. As the declarations are processed, try to also convert
3099 * the types to HIR. This ensures that structure definitions embedded in
3100 * other structure definitions are processed.
3102 glsl_struct_field
*const fields
= talloc_array(state
, glsl_struct_field
,
3106 foreach_list_typed (ast_declarator_list
, decl_list
, link
,
3107 &this->declarations
) {
3108 const char *type_name
;
3110 decl_list
->type
->specifier
->hir(instructions
, state
);
3112 /* Section 10.9 of the GLSL ES 1.00 specification states that
3113 * embedded structure definitions have been removed from the language.
3115 if (state
->es_shader
&& decl_list
->type
->specifier
->structure
!= NULL
) {
3116 YYLTYPE loc
= this->get_location();
3117 _mesa_glsl_error(&loc
, state
, "Embedded structure definitions are "
3118 "not allowed in GLSL ES 1.00.");
3121 const glsl_type
*decl_type
=
3122 decl_list
->type
->specifier
->glsl_type(& type_name
, state
);
3124 foreach_list_typed (ast_declaration
, decl
, link
,
3125 &decl_list
->declarations
) {
3126 const struct glsl_type
*field_type
= decl_type
;
3127 if (decl
->is_array
) {
3128 YYLTYPE loc
= decl
->get_location();
3129 field_type
= process_array_type(&loc
, decl_type
, decl
->array_size
,
3132 fields
[i
].type
= (field_type
!= NULL
)
3133 ? field_type
: glsl_type::error_type
;
3134 fields
[i
].name
= decl
->identifier
;
3139 assert(i
== decl_count
);
3141 const glsl_type
*t
=
3142 glsl_type::get_record_instance(fields
, decl_count
, this->name
);
3144 YYLTYPE loc
= this->get_location();
3145 if (!state
->symbols
->add_type(name
, t
)) {
3146 _mesa_glsl_error(& loc
, state
, "struct `%s' previously defined", name
);
3149 const glsl_type
**s
= (const glsl_type
**)
3150 realloc(state
->user_structures
,
3151 sizeof(state
->user_structures
[0]) *
3152 (state
->num_user_structures
+ 1));
3154 s
[state
->num_user_structures
] = t
;
3155 state
->user_structures
= s
;
3156 state
->num_user_structures
++;
3160 /* Structure type definitions do not have r-values.