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 if (state
->language_version
< 130) {
439 _mesa_glsl_error(loc
, state
,
440 "operator '%%' is reserved in %s",
441 state
->version_string
);
442 return glsl_type::error_type
;
445 /* From GLSL 1.50 spec, page 56:
446 * "The operator modulus (%) operates on signed or unsigned integers or
447 * integer vectors. The operand types must both be signed or both be
450 if (!type_a
->is_integer() || !type_b
->is_integer()
451 || (type_a
->base_type
!= type_b
->base_type
)) {
452 _mesa_glsl_error(loc
, state
, "type mismatch");
453 return glsl_type::error_type
;
456 /* "The operands cannot be vectors of differing size. If one operand is
457 * a scalar and the other vector, then the scalar is applied component-
458 * wise to the vector, resulting in the same type as the vector. If both
459 * are vectors of the same size, the result is computed component-wise."
461 if (type_a
->is_vector()) {
462 if (!type_b
->is_vector()
463 || (type_a
->vector_elements
== type_b
->vector_elements
))
468 /* "The operator modulus (%) is not defined for any other data types
469 * (non-integer types)."
471 _mesa_glsl_error(loc
, state
, "type mismatch");
472 return glsl_type::error_type
;
476 static const struct glsl_type
*
477 relational_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
478 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
480 const glsl_type
*type_a
= value_a
->type
;
481 const glsl_type
*type_b
= value_b
->type
;
483 /* From GLSL 1.50 spec, page 56:
484 * "The relational operators greater than (>), less than (<), greater
485 * than or equal (>=), and less than or equal (<=) operate only on
486 * scalar integer and scalar floating-point expressions."
488 if (!type_a
->is_numeric()
489 || !type_b
->is_numeric()
490 || !type_a
->is_scalar()
491 || !type_b
->is_scalar()) {
492 _mesa_glsl_error(loc
, state
,
493 "Operands to relational operators must be scalar and "
495 return glsl_type::error_type
;
498 /* "Either the operands' types must match, or the conversions from
499 * Section 4.1.10 "Implicit Conversions" will be applied to the integer
500 * operand, after which the types must match."
502 if (!apply_implicit_conversion(type_a
, value_b
, state
)
503 && !apply_implicit_conversion(type_b
, value_a
, state
)) {
504 _mesa_glsl_error(loc
, state
,
505 "Could not implicitly convert operands to "
506 "relational operator");
507 return glsl_type::error_type
;
509 type_a
= value_a
->type
;
510 type_b
= value_b
->type
;
512 if (type_a
->base_type
!= type_b
->base_type
) {
513 _mesa_glsl_error(loc
, state
, "base type mismatch");
514 return glsl_type::error_type
;
517 /* "The result is scalar Boolean."
519 return glsl_type::bool_type
;
523 * \brief Return the result type of a bit-shift operation.
525 * If the given types to the bit-shift operator are invalid, return
526 * glsl_type::error_type.
528 * \param type_a Type of LHS of bit-shift op
529 * \param type_b Type of RHS of bit-shift op
531 static const struct glsl_type
*
532 shift_result_type(const struct glsl_type
*type_a
,
533 const struct glsl_type
*type_b
,
535 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
537 if (state
->language_version
< 130) {
538 _mesa_glsl_error(loc
, state
, "bit operations require GLSL 1.30");
539 return glsl_type::error_type
;
542 /* From page 50 (page 56 of the PDF) of the GLSL 1.30 spec:
544 * "The shift operators (<<) and (>>). For both operators, the operands
545 * must be signed or unsigned integers or integer vectors. One operand
546 * can be signed while the other is unsigned."
548 if (!type_a
->is_integer()) {
549 _mesa_glsl_error(loc
, state
, "LHS of operator %s must be an integer or "
550 "integer vector", ast_expression::operator_string(op
));
551 return glsl_type::error_type
;
554 if (!type_b
->is_integer()) {
555 _mesa_glsl_error(loc
, state
, "RHS of operator %s must be an integer or "
556 "integer vector", ast_expression::operator_string(op
));
557 return glsl_type::error_type
;
560 /* "If the first operand is a scalar, the second operand has to be
563 if (type_a
->is_scalar() && !type_b
->is_scalar()) {
564 _mesa_glsl_error(loc
, state
, "If the first operand of %s is scalar, the "
565 "second must be scalar as well",
566 ast_expression::operator_string(op
));
567 return glsl_type::error_type
;
570 /* If both operands are vectors, check that they have same number of
573 if (type_a
->is_vector() &&
574 type_b
->is_vector() &&
575 type_a
->vector_elements
!= type_b
->vector_elements
) {
576 _mesa_glsl_error(loc
, state
, "Vector operands to operator %s must "
577 "have same number of elements",
578 ast_expression::operator_string(op
));
579 return glsl_type::error_type
;
582 /* "In all cases, the resulting type will be the same type as the left
589 * Validates that a value can be assigned to a location with a specified type
591 * Validates that \c rhs can be assigned to some location. If the types are
592 * not an exact match but an automatic conversion is possible, \c rhs will be
596 * \c NULL if \c rhs cannot be assigned to a location with type \c lhs_type.
597 * Otherwise the actual RHS to be assigned will be returned. This may be
598 * \c rhs, or it may be \c rhs after some type conversion.
601 * In addition to being used for assignments, this function is used to
602 * type-check return values.
605 validate_assignment(struct _mesa_glsl_parse_state
*state
,
606 const glsl_type
*lhs_type
, ir_rvalue
*rhs
)
608 /* If there is already some error in the RHS, just return it. Anything
609 * else will lead to an avalanche of error message back to the user.
611 if (rhs
->type
->is_error())
614 /* If the types are identical, the assignment can trivially proceed.
616 if (rhs
->type
== lhs_type
)
619 /* If the array element types are the same and the size of the LHS is zero,
620 * the assignment is okay.
622 * Note: Whole-array assignments are not permitted in GLSL 1.10, but this
623 * is handled by ir_dereference::is_lvalue.
625 if (lhs_type
->is_array() && rhs
->type
->is_array()
626 && (lhs_type
->element_type() == rhs
->type
->element_type())
627 && (lhs_type
->array_size() == 0)) {
631 /* Check for implicit conversion in GLSL 1.20 */
632 if (apply_implicit_conversion(lhs_type
, rhs
, state
)) {
633 if (rhs
->type
== lhs_type
)
641 do_assignment(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
,
642 ir_rvalue
*lhs
, ir_rvalue
*rhs
,
646 bool error_emitted
= (lhs
->type
->is_error() || rhs
->type
->is_error());
648 if (!error_emitted
) {
649 if (lhs
->variable_referenced() != NULL
650 && lhs
->variable_referenced()->read_only
) {
651 _mesa_glsl_error(&lhs_loc
, state
,
652 "assignment to read-only variable '%s'",
653 lhs
->variable_referenced()->name
);
654 error_emitted
= true;
656 } else if (!lhs
->is_lvalue()) {
657 _mesa_glsl_error(& lhs_loc
, state
, "non-lvalue in assignment");
658 error_emitted
= true;
661 if (state
->es_shader
&& lhs
->type
->is_array()) {
662 _mesa_glsl_error(&lhs_loc
, state
, "whole array assignment is not "
663 "allowed in GLSL ES 1.00.");
664 error_emitted
= true;
668 ir_rvalue
*new_rhs
= validate_assignment(state
, lhs
->type
, rhs
);
669 if (new_rhs
== NULL
) {
670 _mesa_glsl_error(& lhs_loc
, state
, "type mismatch");
674 /* If the LHS array was not declared with a size, it takes it size from
675 * the RHS. If the LHS is an l-value and a whole array, it must be a
676 * dereference of a variable. Any other case would require that the LHS
677 * is either not an l-value or not a whole array.
679 if (lhs
->type
->array_size() == 0) {
680 ir_dereference
*const d
= lhs
->as_dereference();
684 ir_variable
*const var
= d
->variable_referenced();
688 if (var
->max_array_access
>= unsigned(rhs
->type
->array_size())) {
689 /* FINISHME: This should actually log the location of the RHS. */
690 _mesa_glsl_error(& lhs_loc
, state
, "array size must be > %u due to "
692 var
->max_array_access
);
695 var
->type
= glsl_type::get_array_instance(lhs
->type
->element_type(),
696 rhs
->type
->array_size());
701 /* Most callers of do_assignment (assign, add_assign, pre_inc/dec,
702 * but not post_inc) need the converted assigned value as an rvalue
703 * to handle things like:
707 * So we always just store the computed value being assigned to a
708 * temporary and return a deref of that temporary. If the rvalue
709 * ends up not being used, the temp will get copy-propagated out.
711 ir_variable
*var
= new(ctx
) ir_variable(rhs
->type
, "assignment_tmp",
713 ir_dereference_variable
*deref_var
= new(ctx
) ir_dereference_variable(var
);
714 instructions
->push_tail(var
);
715 instructions
->push_tail(new(ctx
) ir_assignment(deref_var
,
718 deref_var
= new(ctx
) ir_dereference_variable(var
);
721 instructions
->push_tail(new(ctx
) ir_assignment(lhs
, deref_var
, NULL
));
723 return new(ctx
) ir_dereference_variable(var
);
727 get_lvalue_copy(exec_list
*instructions
, ir_rvalue
*lvalue
)
729 void *ctx
= ralloc_parent(lvalue
);
732 var
= new(ctx
) ir_variable(lvalue
->type
, "_post_incdec_tmp",
734 instructions
->push_tail(var
);
735 var
->mode
= ir_var_auto
;
737 instructions
->push_tail(new(ctx
) ir_assignment(new(ctx
) ir_dereference_variable(var
),
740 /* Once we've created this temporary, mark it read only so it's no
741 * longer considered an lvalue.
743 var
->read_only
= true;
745 return new(ctx
) ir_dereference_variable(var
);
750 ast_node::hir(exec_list
*instructions
,
751 struct _mesa_glsl_parse_state
*state
)
760 mark_whole_array_access(ir_rvalue
*access
)
762 ir_dereference_variable
*deref
= access
->as_dereference_variable();
765 deref
->var
->max_array_access
= deref
->type
->length
- 1;
770 do_comparison(void *mem_ctx
, int operation
, ir_rvalue
*op0
, ir_rvalue
*op1
)
773 ir_rvalue
*cmp
= NULL
;
775 if (operation
== ir_binop_all_equal
)
776 join_op
= ir_binop_logic_and
;
778 join_op
= ir_binop_logic_or
;
780 switch (op0
->type
->base_type
) {
781 case GLSL_TYPE_FLOAT
:
785 return new(mem_ctx
) ir_expression(operation
, op0
, op1
);
787 case GLSL_TYPE_ARRAY
: {
788 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
789 ir_rvalue
*e0
, *e1
, *result
;
791 e0
= new(mem_ctx
) ir_dereference_array(op0
->clone(mem_ctx
, NULL
),
792 new(mem_ctx
) ir_constant(i
));
793 e1
= new(mem_ctx
) ir_dereference_array(op1
->clone(mem_ctx
, NULL
),
794 new(mem_ctx
) ir_constant(i
));
795 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
798 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
804 mark_whole_array_access(op0
);
805 mark_whole_array_access(op1
);
809 case GLSL_TYPE_STRUCT
: {
810 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
811 ir_rvalue
*e0
, *e1
, *result
;
812 const char *field_name
= op0
->type
->fields
.structure
[i
].name
;
814 e0
= new(mem_ctx
) ir_dereference_record(op0
->clone(mem_ctx
, NULL
),
816 e1
= new(mem_ctx
) ir_dereference_record(op1
->clone(mem_ctx
, NULL
),
818 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
821 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
829 case GLSL_TYPE_ERROR
:
831 case GLSL_TYPE_SAMPLER
:
832 /* I assume a comparison of a struct containing a sampler just
833 * ignores the sampler present in the type.
838 assert(!"Should not get here.");
843 cmp
= new(mem_ctx
) ir_constant(true);
849 ast_expression::hir(exec_list
*instructions
,
850 struct _mesa_glsl_parse_state
*state
)
853 static const int operations
[AST_NUM_OPERATORS
] = {
854 -1, /* ast_assign doesn't convert to ir_expression. */
855 -1, /* ast_plus doesn't convert to ir_expression. */
879 /* Note: The following block of expression types actually convert
880 * to multiple IR instructions.
882 ir_binop_mul
, /* ast_mul_assign */
883 ir_binop_div
, /* ast_div_assign */
884 ir_binop_mod
, /* ast_mod_assign */
885 ir_binop_add
, /* ast_add_assign */
886 ir_binop_sub
, /* ast_sub_assign */
887 ir_binop_lshift
, /* ast_ls_assign */
888 ir_binop_rshift
, /* ast_rs_assign */
889 ir_binop_bit_and
, /* ast_and_assign */
890 ir_binop_bit_xor
, /* ast_xor_assign */
891 ir_binop_bit_or
, /* ast_or_assign */
893 -1, /* ast_conditional doesn't convert to ir_expression. */
894 ir_binop_add
, /* ast_pre_inc. */
895 ir_binop_sub
, /* ast_pre_dec. */
896 ir_binop_add
, /* ast_post_inc. */
897 ir_binop_sub
, /* ast_post_dec. */
898 -1, /* ast_field_selection doesn't conv to ir_expression. */
899 -1, /* ast_array_index doesn't convert to ir_expression. */
900 -1, /* ast_function_call doesn't conv to ir_expression. */
901 -1, /* ast_identifier doesn't convert to ir_expression. */
902 -1, /* ast_int_constant doesn't convert to ir_expression. */
903 -1, /* ast_uint_constant doesn't conv to ir_expression. */
904 -1, /* ast_float_constant doesn't conv to ir_expression. */
905 -1, /* ast_bool_constant doesn't conv to ir_expression. */
906 -1, /* ast_sequence doesn't convert to ir_expression. */
908 ir_rvalue
*result
= NULL
;
910 const struct glsl_type
*type
= glsl_type::error_type
;
911 bool error_emitted
= false;
914 loc
= this->get_location();
916 switch (this->oper
) {
918 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
919 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
921 result
= do_assignment(instructions
, state
, op
[0], op
[1],
922 this->subexpressions
[0]->get_location());
923 error_emitted
= result
->type
->is_error();
929 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
931 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
933 error_emitted
= type
->is_error();
939 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
941 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
943 error_emitted
= type
->is_error();
945 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
953 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
954 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
956 type
= arithmetic_result_type(op
[0], op
[1],
957 (this->oper
== ast_mul
),
959 error_emitted
= type
->is_error();
961 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
966 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
967 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
969 type
= modulus_result_type(op
[0]->type
, op
[1]->type
, state
, & loc
);
971 assert(operations
[this->oper
] == ir_binop_mod
);
973 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
975 error_emitted
= type
->is_error();
980 if (state
->language_version
< 130) {
981 _mesa_glsl_error(&loc
, state
, "operator %s requires GLSL 1.30",
982 operator_string(this->oper
));
983 error_emitted
= true;
986 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
987 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
988 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
990 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
992 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
999 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1000 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1002 type
= relational_result_type(op
[0], op
[1], state
, & loc
);
1004 /* The relational operators must either generate an error or result
1005 * in a scalar boolean. See page 57 of the GLSL 1.50 spec.
1007 assert(type
->is_error()
1008 || ((type
->base_type
== GLSL_TYPE_BOOL
)
1009 && type
->is_scalar()));
1011 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1013 error_emitted
= type
->is_error();
1018 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1019 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1021 /* From page 58 (page 64 of the PDF) of the GLSL 1.50 spec:
1023 * "The equality operators equal (==), and not equal (!=)
1024 * operate on all types. They result in a scalar Boolean. If
1025 * the operand types do not match, then there must be a
1026 * conversion from Section 4.1.10 "Implicit Conversions"
1027 * applied to one operand that can make them match, in which
1028 * case this conversion is done."
1030 if ((!apply_implicit_conversion(op
[0]->type
, op
[1], state
)
1031 && !apply_implicit_conversion(op
[1]->type
, op
[0], state
))
1032 || (op
[0]->type
!= op
[1]->type
)) {
1033 _mesa_glsl_error(& loc
, state
, "operands of `%s' must have the same "
1034 "type", (this->oper
== ast_equal
) ? "==" : "!=");
1035 error_emitted
= true;
1036 } else if ((state
->language_version
<= 110)
1037 && (op
[0]->type
->is_array() || op
[1]->type
->is_array())) {
1038 _mesa_glsl_error(& loc
, state
, "array comparisons forbidden in "
1040 error_emitted
= true;
1043 result
= do_comparison(ctx
, operations
[this->oper
], op
[0], op
[1]);
1044 type
= glsl_type::bool_type
;
1046 assert(error_emitted
|| (result
->type
== glsl_type::bool_type
));
1052 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1053 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1054 type
= bit_logic_result_type(op
[0]->type
, op
[1]->type
, this->oper
,
1056 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1058 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1062 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1064 if (state
->language_version
< 130) {
1065 _mesa_glsl_error(&loc
, state
, "bit-wise operations require GLSL 1.30");
1066 error_emitted
= true;
1069 if (!op
[0]->type
->is_integer()) {
1070 _mesa_glsl_error(&loc
, state
, "operand of `~' must be an integer");
1071 error_emitted
= true;
1075 result
= new(ctx
) ir_expression(ir_unop_bit_not
, type
, op
[0], NULL
);
1078 case ast_logic_and
: {
1079 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1081 if (!op
[0]->type
->is_boolean() || !op
[0]->type
->is_scalar()) {
1082 YYLTYPE loc
= this->subexpressions
[0]->get_location();
1084 _mesa_glsl_error(& loc
, state
, "LHS of `%s' must be scalar boolean",
1085 operator_string(this->oper
));
1086 error_emitted
= true;
1089 ir_constant
*op0_const
= op
[0]->constant_expression_value();
1091 if (op0_const
->value
.b
[0]) {
1092 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1094 if (!op
[1]->type
->is_boolean() || !op
[1]->type
->is_scalar()) {
1095 YYLTYPE loc
= this->subexpressions
[1]->get_location();
1097 _mesa_glsl_error(& loc
, state
,
1098 "RHS of `%s' must be scalar boolean",
1099 operator_string(this->oper
));
1100 error_emitted
= true;
1106 type
= glsl_type::bool_type
;
1108 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1111 instructions
->push_tail(tmp
);
1113 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1114 instructions
->push_tail(stmt
);
1116 op
[1] = this->subexpressions
[1]->hir(&stmt
->then_instructions
, state
);
1118 if (!op
[1]->type
->is_boolean() || !op
[1]->type
->is_scalar()) {
1119 YYLTYPE loc
= this->subexpressions
[1]->get_location();
1121 _mesa_glsl_error(& loc
, state
,
1122 "RHS of `%s' must be scalar boolean",
1123 operator_string(this->oper
));
1124 error_emitted
= true;
1127 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1128 ir_assignment
*const then_assign
=
1129 new(ctx
) ir_assignment(then_deref
, op
[1], NULL
);
1130 stmt
->then_instructions
.push_tail(then_assign
);
1132 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1133 ir_assignment
*const else_assign
=
1134 new(ctx
) ir_assignment(else_deref
, new(ctx
) ir_constant(false), NULL
);
1135 stmt
->else_instructions
.push_tail(else_assign
);
1137 result
= new(ctx
) ir_dereference_variable(tmp
);
1143 case ast_logic_or
: {
1144 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1146 if (!op
[0]->type
->is_boolean() || !op
[0]->type
->is_scalar()) {
1147 YYLTYPE loc
= this->subexpressions
[0]->get_location();
1149 _mesa_glsl_error(& loc
, state
, "LHS of `%s' must be scalar boolean",
1150 operator_string(this->oper
));
1151 error_emitted
= true;
1154 ir_constant
*op0_const
= op
[0]->constant_expression_value();
1156 if (op0_const
->value
.b
[0]) {
1159 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1161 if (!op
[1]->type
->is_boolean() || !op
[1]->type
->is_scalar()) {
1162 YYLTYPE loc
= this->subexpressions
[1]->get_location();
1164 _mesa_glsl_error(& loc
, state
,
1165 "RHS of `%s' must be scalar boolean",
1166 operator_string(this->oper
));
1167 error_emitted
= true;
1171 type
= glsl_type::bool_type
;
1173 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1176 instructions
->push_tail(tmp
);
1178 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1179 instructions
->push_tail(stmt
);
1181 op
[1] = this->subexpressions
[1]->hir(&stmt
->else_instructions
, state
);
1183 if (!op
[1]->type
->is_boolean() || !op
[1]->type
->is_scalar()) {
1184 YYLTYPE loc
= this->subexpressions
[1]->get_location();
1186 _mesa_glsl_error(& loc
, state
, "RHS of `%s' must be scalar boolean",
1187 operator_string(this->oper
));
1188 error_emitted
= true;
1191 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1192 ir_assignment
*const then_assign
=
1193 new(ctx
) ir_assignment(then_deref
, new(ctx
) ir_constant(true), NULL
);
1194 stmt
->then_instructions
.push_tail(then_assign
);
1196 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1197 ir_assignment
*const else_assign
=
1198 new(ctx
) ir_assignment(else_deref
, op
[1], NULL
);
1199 stmt
->else_instructions
.push_tail(else_assign
);
1201 result
= new(ctx
) ir_dereference_variable(tmp
);
1208 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1209 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1212 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1214 type
= glsl_type::bool_type
;
1218 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1220 if (!op
[0]->type
->is_boolean() || !op
[0]->type
->is_scalar()) {
1221 YYLTYPE loc
= this->subexpressions
[0]->get_location();
1223 _mesa_glsl_error(& loc
, state
,
1224 "operand of `!' must be scalar boolean");
1225 error_emitted
= true;
1228 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1230 type
= glsl_type::bool_type
;
1233 case ast_mul_assign
:
1234 case ast_div_assign
:
1235 case ast_add_assign
:
1236 case ast_sub_assign
: {
1237 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1238 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1240 type
= arithmetic_result_type(op
[0], op
[1],
1241 (this->oper
== ast_mul_assign
),
1244 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1247 result
= do_assignment(instructions
, state
,
1248 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1249 this->subexpressions
[0]->get_location());
1250 type
= result
->type
;
1251 error_emitted
= (op
[0]->type
->is_error());
1253 /* GLSL 1.10 does not allow array assignment. However, we don't have to
1254 * explicitly test for this because none of the binary expression
1255 * operators allow array operands either.
1261 case ast_mod_assign
: {
1262 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1263 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1265 type
= modulus_result_type(op
[0]->type
, op
[1]->type
, state
, & loc
);
1267 assert(operations
[this->oper
] == ir_binop_mod
);
1269 ir_rvalue
*temp_rhs
;
1270 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1273 result
= do_assignment(instructions
, state
,
1274 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1275 this->subexpressions
[0]->get_location());
1276 type
= result
->type
;
1277 error_emitted
= type
->is_error();
1282 case ast_rs_assign
: {
1283 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1284 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1285 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1287 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1288 type
, op
[0], op
[1]);
1289 result
= do_assignment(instructions
, state
, op
[0]->clone(ctx
, NULL
),
1291 this->subexpressions
[0]->get_location());
1292 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1296 case ast_and_assign
:
1297 case ast_xor_assign
:
1298 case ast_or_assign
: {
1299 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1300 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1301 type
= bit_logic_result_type(op
[0]->type
, op
[1]->type
, this->oper
,
1303 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1304 type
, op
[0], op
[1]);
1305 result
= do_assignment(instructions
, state
, op
[0]->clone(ctx
, NULL
),
1307 this->subexpressions
[0]->get_location());
1308 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1312 case ast_conditional
: {
1313 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1315 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1317 * "The ternary selection operator (?:). It operates on three
1318 * expressions (exp1 ? exp2 : exp3). This operator evaluates the
1319 * first expression, which must result in a scalar Boolean."
1321 if (!op
[0]->type
->is_boolean() || !op
[0]->type
->is_scalar()) {
1322 YYLTYPE loc
= this->subexpressions
[0]->get_location();
1324 _mesa_glsl_error(& loc
, state
, "?: condition must be scalar boolean");
1325 error_emitted
= true;
1328 /* The :? operator is implemented by generating an anonymous temporary
1329 * followed by an if-statement. The last instruction in each branch of
1330 * the if-statement assigns a value to the anonymous temporary. This
1331 * temporary is the r-value of the expression.
1333 exec_list then_instructions
;
1334 exec_list else_instructions
;
1336 op
[1] = this->subexpressions
[1]->hir(&then_instructions
, state
);
1337 op
[2] = this->subexpressions
[2]->hir(&else_instructions
, state
);
1339 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1341 * "The second and third expressions can be any type, as
1342 * long their types match, or there is a conversion in
1343 * Section 4.1.10 "Implicit Conversions" that can be applied
1344 * to one of the expressions to make their types match. This
1345 * resulting matching type is the type of the entire
1348 if ((!apply_implicit_conversion(op
[1]->type
, op
[2], state
)
1349 && !apply_implicit_conversion(op
[2]->type
, op
[1], state
))
1350 || (op
[1]->type
!= op
[2]->type
)) {
1351 YYLTYPE loc
= this->subexpressions
[1]->get_location();
1353 _mesa_glsl_error(& loc
, state
, "Second and third operands of ?: "
1354 "operator must have matching types.");
1355 error_emitted
= true;
1356 type
= glsl_type::error_type
;
1361 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1363 * "The second and third expressions must be the same type, but can
1364 * be of any type other than an array."
1366 if ((state
->language_version
<= 110) && type
->is_array()) {
1367 _mesa_glsl_error(& loc
, state
, "Second and third operands of ?: "
1368 "operator must not be arrays.");
1369 error_emitted
= true;
1372 ir_constant
*cond_val
= op
[0]->constant_expression_value();
1373 ir_constant
*then_val
= op
[1]->constant_expression_value();
1374 ir_constant
*else_val
= op
[2]->constant_expression_value();
1376 if (then_instructions
.is_empty()
1377 && else_instructions
.is_empty()
1378 && (cond_val
!= NULL
) && (then_val
!= NULL
) && (else_val
!= NULL
)) {
1379 result
= (cond_val
->value
.b
[0]) ? then_val
: else_val
;
1381 ir_variable
*const tmp
=
1382 new(ctx
) ir_variable(type
, "conditional_tmp", ir_var_temporary
);
1383 instructions
->push_tail(tmp
);
1385 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1386 instructions
->push_tail(stmt
);
1388 then_instructions
.move_nodes_to(& stmt
->then_instructions
);
1389 ir_dereference
*const then_deref
=
1390 new(ctx
) ir_dereference_variable(tmp
);
1391 ir_assignment
*const then_assign
=
1392 new(ctx
) ir_assignment(then_deref
, op
[1], NULL
);
1393 stmt
->then_instructions
.push_tail(then_assign
);
1395 else_instructions
.move_nodes_to(& stmt
->else_instructions
);
1396 ir_dereference
*const else_deref
=
1397 new(ctx
) ir_dereference_variable(tmp
);
1398 ir_assignment
*const else_assign
=
1399 new(ctx
) ir_assignment(else_deref
, op
[2], NULL
);
1400 stmt
->else_instructions
.push_tail(else_assign
);
1402 result
= new(ctx
) ir_dereference_variable(tmp
);
1409 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1410 if (op
[0]->type
->base_type
== GLSL_TYPE_FLOAT
)
1411 op
[1] = new(ctx
) ir_constant(1.0f
);
1413 op
[1] = new(ctx
) ir_constant(1);
1415 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1417 ir_rvalue
*temp_rhs
;
1418 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1421 result
= do_assignment(instructions
, state
,
1422 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1423 this->subexpressions
[0]->get_location());
1424 type
= result
->type
;
1425 error_emitted
= op
[0]->type
->is_error();
1430 case ast_post_dec
: {
1431 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1432 if (op
[0]->type
->base_type
== GLSL_TYPE_FLOAT
)
1433 op
[1] = new(ctx
) ir_constant(1.0f
);
1435 op
[1] = new(ctx
) ir_constant(1);
1437 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1439 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1441 ir_rvalue
*temp_rhs
;
1442 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1445 /* Get a temporary of a copy of the lvalue before it's modified.
1446 * This may get thrown away later.
1448 result
= get_lvalue_copy(instructions
, op
[0]->clone(ctx
, NULL
));
1450 (void)do_assignment(instructions
, state
,
1451 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1452 this->subexpressions
[0]->get_location());
1454 type
= result
->type
;
1455 error_emitted
= op
[0]->type
->is_error();
1459 case ast_field_selection
:
1460 result
= _mesa_ast_field_selection_to_hir(this, instructions
, state
);
1461 type
= result
->type
;
1464 case ast_array_index
: {
1465 YYLTYPE index_loc
= subexpressions
[1]->get_location();
1467 op
[0] = subexpressions
[0]->hir(instructions
, state
);
1468 op
[1] = subexpressions
[1]->hir(instructions
, state
);
1470 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1472 ir_rvalue
*const array
= op
[0];
1474 result
= new(ctx
) ir_dereference_array(op
[0], op
[1]);
1476 /* Do not use op[0] after this point. Use array.
1484 if (!array
->type
->is_array()
1485 && !array
->type
->is_matrix()
1486 && !array
->type
->is_vector()) {
1487 _mesa_glsl_error(& index_loc
, state
,
1488 "cannot dereference non-array / non-matrix / "
1490 error_emitted
= true;
1493 if (!op
[1]->type
->is_integer()) {
1494 _mesa_glsl_error(& index_loc
, state
,
1495 "array index must be integer type");
1496 error_emitted
= true;
1497 } else if (!op
[1]->type
->is_scalar()) {
1498 _mesa_glsl_error(& index_loc
, state
,
1499 "array index must be scalar");
1500 error_emitted
= true;
1503 /* If the array index is a constant expression and the array has a
1504 * declared size, ensure that the access is in-bounds. If the array
1505 * index is not a constant expression, ensure that the array has a
1508 ir_constant
*const const_index
= op
[1]->constant_expression_value();
1509 if (const_index
!= NULL
) {
1510 const int idx
= const_index
->value
.i
[0];
1511 const char *type_name
;
1514 if (array
->type
->is_matrix()) {
1515 type_name
= "matrix";
1516 } else if (array
->type
->is_vector()) {
1517 type_name
= "vector";
1519 type_name
= "array";
1522 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec:
1524 * "It is illegal to declare an array with a size, and then
1525 * later (in the same shader) index the same array with an
1526 * integral constant expression greater than or equal to the
1527 * declared size. It is also illegal to index an array with a
1528 * negative constant expression."
1530 if (array
->type
->is_matrix()) {
1531 if (array
->type
->row_type()->vector_elements
<= idx
) {
1532 bound
= array
->type
->row_type()->vector_elements
;
1534 } else if (array
->type
->is_vector()) {
1535 if (array
->type
->vector_elements
<= idx
) {
1536 bound
= array
->type
->vector_elements
;
1539 if ((array
->type
->array_size() > 0)
1540 && (array
->type
->array_size() <= idx
)) {
1541 bound
= array
->type
->array_size();
1546 _mesa_glsl_error(& loc
, state
, "%s index must be < %u",
1548 error_emitted
= true;
1549 } else if (idx
< 0) {
1550 _mesa_glsl_error(& loc
, state
, "%s index must be >= 0",
1552 error_emitted
= true;
1555 if (array
->type
->is_array()) {
1556 /* If the array is a variable dereference, it dereferences the
1557 * whole array, by definition. Use this to get the variable.
1559 * FINISHME: Should some methods for getting / setting / testing
1560 * FINISHME: array access limits be added to ir_dereference?
1562 ir_variable
*const v
= array
->whole_variable_referenced();
1563 if ((v
!= NULL
) && (unsigned(idx
) > v
->max_array_access
))
1564 v
->max_array_access
= idx
;
1566 } else if (array
->type
->array_size() == 0) {
1567 _mesa_glsl_error(&loc
, state
, "unsized array index must be constant");
1569 if (array
->type
->is_array()) {
1570 /* whole_variable_referenced can return NULL if the array is a
1571 * member of a structure. In this case it is safe to not update
1572 * the max_array_access field because it is never used for fields
1575 ir_variable
*v
= array
->whole_variable_referenced();
1577 v
->max_array_access
= array
->type
->array_size();
1581 /* From page 23 (29 of the PDF) of the GLSL 1.30 spec:
1583 * "Samplers aggregated into arrays within a shader (using square
1584 * brackets [ ]) can only be indexed with integral constant
1585 * expressions [...]."
1587 * This restriction was added in GLSL 1.30. Shaders using earlier version
1588 * of the language should not be rejected by the compiler front-end for
1589 * using this construct. This allows useful things such as using a loop
1590 * counter as the index to an array of samplers. If the loop in unrolled,
1591 * the code should compile correctly. Instead, emit a warning.
1593 if (array
->type
->is_array() &&
1594 array
->type
->element_type()->is_sampler() &&
1595 const_index
== NULL
) {
1597 if (state
->language_version
== 100) {
1598 _mesa_glsl_warning(&loc
, state
,
1599 "sampler arrays indexed with non-constant "
1600 "expressions is optional in GLSL ES 1.00");
1601 } else if (state
->language_version
< 130) {
1602 _mesa_glsl_warning(&loc
, state
,
1603 "sampler arrays indexed with non-constant "
1604 "expressions is forbidden in GLSL 1.30 and "
1607 _mesa_glsl_error(&loc
, state
,
1608 "sampler arrays indexed with non-constant "
1609 "expressions is forbidden in GLSL 1.30 and "
1611 error_emitted
= true;
1616 result
->type
= glsl_type::error_type
;
1618 type
= result
->type
;
1622 case ast_function_call
:
1623 /* Should *NEVER* get here. ast_function_call should always be handled
1624 * by ast_function_expression::hir.
1629 case ast_identifier
: {
1630 /* ast_identifier can appear several places in a full abstract syntax
1631 * tree. This particular use must be at location specified in the grammar
1632 * as 'variable_identifier'.
1635 state
->symbols
->get_variable(this->primary_expression
.identifier
);
1637 result
= new(ctx
) ir_dereference_variable(var
);
1641 type
= result
->type
;
1643 _mesa_glsl_error(& loc
, state
, "`%s' undeclared",
1644 this->primary_expression
.identifier
);
1646 error_emitted
= true;
1651 case ast_int_constant
:
1652 type
= glsl_type::int_type
;
1653 result
= new(ctx
) ir_constant(this->primary_expression
.int_constant
);
1656 case ast_uint_constant
:
1657 type
= glsl_type::uint_type
;
1658 result
= new(ctx
) ir_constant(this->primary_expression
.uint_constant
);
1661 case ast_float_constant
:
1662 type
= glsl_type::float_type
;
1663 result
= new(ctx
) ir_constant(this->primary_expression
.float_constant
);
1666 case ast_bool_constant
:
1667 type
= glsl_type::bool_type
;
1668 result
= new(ctx
) ir_constant(bool(this->primary_expression
.bool_constant
));
1671 case ast_sequence
: {
1672 /* It should not be possible to generate a sequence in the AST without
1673 * any expressions in it.
1675 assert(!this->expressions
.is_empty());
1677 /* The r-value of a sequence is the last expression in the sequence. If
1678 * the other expressions in the sequence do not have side-effects (and
1679 * therefore add instructions to the instruction list), they get dropped
1682 foreach_list_typed (ast_node
, ast
, link
, &this->expressions
)
1683 result
= ast
->hir(instructions
, state
);
1685 type
= result
->type
;
1687 /* Any errors should have already been emitted in the loop above.
1689 error_emitted
= true;
1694 if (type
->is_error() && !error_emitted
)
1695 _mesa_glsl_error(& loc
, state
, "type mismatch");
1702 ast_expression_statement::hir(exec_list
*instructions
,
1703 struct _mesa_glsl_parse_state
*state
)
1705 /* It is possible to have expression statements that don't have an
1706 * expression. This is the solitary semicolon:
1708 * for (i = 0; i < 5; i++)
1711 * In this case the expression will be NULL. Test for NULL and don't do
1712 * anything in that case.
1714 if (expression
!= NULL
)
1715 expression
->hir(instructions
, state
);
1717 /* Statements do not have r-values.
1724 ast_compound_statement::hir(exec_list
*instructions
,
1725 struct _mesa_glsl_parse_state
*state
)
1728 state
->symbols
->push_scope();
1730 foreach_list_typed (ast_node
, ast
, link
, &this->statements
)
1731 ast
->hir(instructions
, state
);
1734 state
->symbols
->pop_scope();
1736 /* Compound statements do not have r-values.
1742 static const glsl_type
*
1743 process_array_type(YYLTYPE
*loc
, const glsl_type
*base
, ast_node
*array_size
,
1744 struct _mesa_glsl_parse_state
*state
)
1746 unsigned length
= 0;
1748 /* FINISHME: Reject delcarations of multidimensional arrays. */
1750 if (array_size
!= NULL
) {
1751 exec_list dummy_instructions
;
1752 ir_rvalue
*const ir
= array_size
->hir(& dummy_instructions
, state
);
1753 YYLTYPE loc
= array_size
->get_location();
1755 /* FINISHME: Verify that the grammar forbids side-effects in array
1756 * FINISHME: sizes. i.e., 'vec4 [x = 12] data'
1758 assert(dummy_instructions
.is_empty());
1761 if (!ir
->type
->is_integer()) {
1762 _mesa_glsl_error(& loc
, state
, "array size must be integer type");
1763 } else if (!ir
->type
->is_scalar()) {
1764 _mesa_glsl_error(& loc
, state
, "array size must be scalar type");
1766 ir_constant
*const size
= ir
->constant_expression_value();
1769 _mesa_glsl_error(& loc
, state
, "array size must be a "
1770 "constant valued expression");
1771 } else if (size
->value
.i
[0] <= 0) {
1772 _mesa_glsl_error(& loc
, state
, "array size must be > 0");
1774 assert(size
->type
== ir
->type
);
1775 length
= size
->value
.u
[0];
1779 } else if (state
->es_shader
) {
1780 /* Section 10.17 of the GLSL ES 1.00 specification states that unsized
1781 * array declarations have been removed from the language.
1783 _mesa_glsl_error(loc
, state
, "unsized array declarations are not "
1784 "allowed in GLSL ES 1.00.");
1787 return glsl_type::get_array_instance(base
, length
);
1792 ast_type_specifier::glsl_type(const char **name
,
1793 struct _mesa_glsl_parse_state
*state
) const
1795 const struct glsl_type
*type
;
1797 type
= state
->symbols
->get_type(this->type_name
);
1798 *name
= this->type_name
;
1800 if (this->is_array
) {
1801 YYLTYPE loc
= this->get_location();
1802 type
= process_array_type(&loc
, type
, this->array_size
, state
);
1810 apply_type_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
1812 struct _mesa_glsl_parse_state
*state
,
1815 if (qual
->flags
.q
.invariant
) {
1817 _mesa_glsl_error(loc
, state
,
1818 "variable `%s' may not be redeclared "
1819 "`invariant' after being used",
1826 if (qual
->flags
.q
.constant
|| qual
->flags
.q
.attribute
1827 || qual
->flags
.q
.uniform
1828 || (qual
->flags
.q
.varying
&& (state
->target
== fragment_shader
)))
1831 if (qual
->flags
.q
.centroid
)
1834 if (qual
->flags
.q
.attribute
&& state
->target
!= vertex_shader
) {
1835 var
->type
= glsl_type::error_type
;
1836 _mesa_glsl_error(loc
, state
,
1837 "`attribute' variables may not be declared in the "
1839 _mesa_glsl_shader_target_name(state
->target
));
1842 /* From page 25 (page 31 of the PDF) of the GLSL 1.10 spec:
1844 * "The varying qualifier can be used only with the data types
1845 * float, vec2, vec3, vec4, mat2, mat3, and mat4, or arrays of
1848 if (qual
->flags
.q
.varying
) {
1849 const glsl_type
*non_array_type
;
1851 if (var
->type
&& var
->type
->is_array())
1852 non_array_type
= var
->type
->fields
.array
;
1854 non_array_type
= var
->type
;
1856 if (non_array_type
&& non_array_type
->base_type
!= GLSL_TYPE_FLOAT
) {
1857 var
->type
= glsl_type::error_type
;
1858 _mesa_glsl_error(loc
, state
,
1859 "varying variables must be of base type float");
1863 /* If there is no qualifier that changes the mode of the variable, leave
1864 * the setting alone.
1866 if (qual
->flags
.q
.in
&& qual
->flags
.q
.out
)
1867 var
->mode
= ir_var_inout
;
1868 else if (qual
->flags
.q
.attribute
|| qual
->flags
.q
.in
1869 || (qual
->flags
.q
.varying
&& (state
->target
== fragment_shader
)))
1870 var
->mode
= ir_var_in
;
1871 else if (qual
->flags
.q
.out
1872 || (qual
->flags
.q
.varying
&& (state
->target
== vertex_shader
)))
1873 var
->mode
= ir_var_out
;
1874 else if (qual
->flags
.q
.uniform
)
1875 var
->mode
= ir_var_uniform
;
1877 if (state
->all_invariant
&& (state
->current_function
== NULL
)) {
1878 switch (state
->target
) {
1880 if (var
->mode
== ir_var_out
)
1881 var
->invariant
= true;
1883 case geometry_shader
:
1884 if ((var
->mode
== ir_var_in
) || (var
->mode
== ir_var_out
))
1885 var
->invariant
= true;
1887 case fragment_shader
:
1888 if (var
->mode
== ir_var_in
)
1889 var
->invariant
= true;
1894 if (qual
->flags
.q
.flat
)
1895 var
->interpolation
= ir_var_flat
;
1896 else if (qual
->flags
.q
.noperspective
)
1897 var
->interpolation
= ir_var_noperspective
;
1899 var
->interpolation
= ir_var_smooth
;
1901 var
->pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
1902 var
->origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
1903 if ((qual
->flags
.q
.origin_upper_left
|| qual
->flags
.q
.pixel_center_integer
)
1904 && (strcmp(var
->name
, "gl_FragCoord") != 0)) {
1905 const char *const qual_string
= (qual
->flags
.q
.origin_upper_left
)
1906 ? "origin_upper_left" : "pixel_center_integer";
1908 _mesa_glsl_error(loc
, state
,
1909 "layout qualifier `%s' can only be applied to "
1910 "fragment shader input `gl_FragCoord'",
1914 if (qual
->flags
.q
.explicit_location
) {
1915 const bool global_scope
= (state
->current_function
== NULL
);
1917 const char *string
= "";
1919 /* In the vertex shader only shader inputs can be given explicit
1922 * In the fragment shader only shader outputs can be given explicit
1925 switch (state
->target
) {
1927 if (!global_scope
|| (var
->mode
!= ir_var_in
)) {
1933 case geometry_shader
:
1934 _mesa_glsl_error(loc
, state
,
1935 "geometry shader variables cannot be given "
1936 "explicit locations\n");
1939 case fragment_shader
:
1940 if (!global_scope
|| (var
->mode
!= ir_var_in
)) {
1948 _mesa_glsl_error(loc
, state
,
1949 "only %s shader %s variables can be given an "
1950 "explicit location\n",
1951 _mesa_glsl_shader_target_name(state
->target
),
1954 var
->explicit_location
= true;
1956 /* This bit of silliness is needed because invalid explicit locations
1957 * are supposed to be flagged during linking. Small negative values
1958 * biased by VERT_ATTRIB_GENERIC0 or FRAG_RESULT_DATA0 could alias
1959 * built-in values (e.g., -16+VERT_ATTRIB_GENERIC0 = VERT_ATTRIB_POS).
1960 * The linker needs to be able to differentiate these cases. This
1961 * ensures that negative values stay negative.
1963 if (qual
->location
>= 0) {
1964 var
->location
= (state
->target
== vertex_shader
)
1965 ? (qual
->location
+ VERT_ATTRIB_GENERIC0
)
1966 : (qual
->location
+ FRAG_RESULT_DATA0
);
1968 var
->location
= qual
->location
;
1973 /* Does the declaration use the 'layout' keyword?
1975 const bool uses_layout
= qual
->flags
.q
.pixel_center_integer
1976 || qual
->flags
.q
.origin_upper_left
1977 || qual
->flags
.q
.explicit_location
;
1979 /* Does the declaration use the deprecated 'attribute' or 'varying'
1982 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
1983 || qual
->flags
.q
.varying
;
1985 /* Is the 'layout' keyword used with parameters that allow relaxed checking.
1986 * Many implementations of GL_ARB_fragment_coord_conventions_enable and some
1987 * implementations (only Mesa?) GL_ARB_explicit_attrib_location_enable
1988 * allowed the layout qualifier to be used with 'varying' and 'attribute'.
1989 * These extensions and all following extensions that add the 'layout'
1990 * keyword have been modified to require the use of 'in' or 'out'.
1992 * The following extension do not allow the deprecated keywords:
1994 * GL_AMD_conservative_depth
1995 * GL_ARB_gpu_shader5
1996 * GL_ARB_separate_shader_objects
1997 * GL_ARB_tesselation_shader
1998 * GL_ARB_transform_feedback3
1999 * GL_ARB_uniform_buffer_object
2001 * It is unknown whether GL_EXT_shader_image_load_store or GL_NV_gpu_shader5
2002 * allow layout with the deprecated keywords.
2004 const bool relaxed_layout_qualifier_checking
=
2005 state
->ARB_fragment_coord_conventions_enable
;
2007 if (uses_layout
&& uses_deprecated_qualifier
) {
2008 if (relaxed_layout_qualifier_checking
) {
2009 _mesa_glsl_warning(loc
, state
,
2010 "`layout' qualifier may not be used with "
2011 "`attribute' or `varying'");
2013 _mesa_glsl_error(loc
, state
,
2014 "`layout' qualifier may not be used with "
2015 "`attribute' or `varying'");
2019 /* Layout qualifiers for gl_FragDepth, which are enabled by extension
2020 * AMD_conservative_depth.
2022 int depth_layout_count
= qual
->flags
.q
.depth_any
2023 + qual
->flags
.q
.depth_greater
2024 + qual
->flags
.q
.depth_less
2025 + qual
->flags
.q
.depth_unchanged
;
2026 if (depth_layout_count
> 0
2027 && !state
->AMD_conservative_depth_enable
) {
2028 _mesa_glsl_error(loc
, state
,
2029 "extension GL_AMD_conservative_depth must be enabled "
2030 "to use depth layout qualifiers");
2031 } else if (depth_layout_count
> 0
2032 && strcmp(var
->name
, "gl_FragDepth") != 0) {
2033 _mesa_glsl_error(loc
, state
,
2034 "depth layout qualifiers can be applied only to "
2036 } else if (depth_layout_count
> 1
2037 && strcmp(var
->name
, "gl_FragDepth") == 0) {
2038 _mesa_glsl_error(loc
, state
,
2039 "at most one depth layout qualifier can be applied to "
2042 if (qual
->flags
.q
.depth_any
)
2043 var
->depth_layout
= ir_depth_layout_any
;
2044 else if (qual
->flags
.q
.depth_greater
)
2045 var
->depth_layout
= ir_depth_layout_greater
;
2046 else if (qual
->flags
.q
.depth_less
)
2047 var
->depth_layout
= ir_depth_layout_less
;
2048 else if (qual
->flags
.q
.depth_unchanged
)
2049 var
->depth_layout
= ir_depth_layout_unchanged
;
2051 var
->depth_layout
= ir_depth_layout_none
;
2053 if (var
->type
->is_array() && state
->language_version
!= 110) {
2054 var
->array_lvalue
= true;
2059 * Get the variable that is being redeclared by this declaration
2061 * Semantic checks to verify the validity of the redeclaration are also
2062 * performed. If semantic checks fail, compilation error will be emitted via
2063 * \c _mesa_glsl_error, but a non-\c NULL pointer will still be returned.
2066 * A pointer to an existing variable in the current scope if the declaration
2067 * is a redeclaration, \c NULL otherwise.
2070 get_variable_being_redeclared(ir_variable
*var
, ast_declaration
*decl
,
2071 struct _mesa_glsl_parse_state
*state
)
2073 /* Check if this declaration is actually a re-declaration, either to
2074 * resize an array or add qualifiers to an existing variable.
2076 * This is allowed for variables in the current scope, or when at
2077 * global scope (for built-ins in the implicit outer scope).
2079 ir_variable
*earlier
= state
->symbols
->get_variable(decl
->identifier
);
2080 if (earlier
== NULL
||
2081 (state
->current_function
!= NULL
&&
2082 !state
->symbols
->name_declared_this_scope(decl
->identifier
))) {
2087 YYLTYPE loc
= decl
->get_location();
2089 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec,
2091 * "It is legal to declare an array without a size and then
2092 * later re-declare the same name as an array of the same
2093 * type and specify a size."
2095 if ((earlier
->type
->array_size() == 0)
2096 && var
->type
->is_array()
2097 && (var
->type
->element_type() == earlier
->type
->element_type())) {
2098 /* FINISHME: This doesn't match the qualifiers on the two
2099 * FINISHME: declarations. It's not 100% clear whether this is
2100 * FINISHME: required or not.
2103 /* From page 54 (page 60 of the PDF) of the GLSL 1.20 spec:
2105 * "The size [of gl_TexCoord] can be at most
2106 * gl_MaxTextureCoords."
2108 const unsigned size
= unsigned(var
->type
->array_size());
2109 if ((strcmp("gl_TexCoord", var
->name
) == 0)
2110 && (size
> state
->Const
.MaxTextureCoords
)) {
2111 _mesa_glsl_error(& loc
, state
, "`gl_TexCoord' array size cannot "
2112 "be larger than gl_MaxTextureCoords (%u)\n",
2113 state
->Const
.MaxTextureCoords
);
2114 } else if ((size
> 0) && (size
<= earlier
->max_array_access
)) {
2115 _mesa_glsl_error(& loc
, state
, "array size must be > %u due to "
2117 earlier
->max_array_access
);
2120 earlier
->type
= var
->type
;
2123 } else if (state
->ARB_fragment_coord_conventions_enable
2124 && strcmp(var
->name
, "gl_FragCoord") == 0
2125 && earlier
->type
== var
->type
2126 && earlier
->mode
== var
->mode
) {
2127 /* Allow redeclaration of gl_FragCoord for ARB_fcc layout
2130 earlier
->origin_upper_left
= var
->origin_upper_left
;
2131 earlier
->pixel_center_integer
= var
->pixel_center_integer
;
2133 /* According to section 4.3.7 of the GLSL 1.30 spec,
2134 * the following built-in varaibles can be redeclared with an
2135 * interpolation qualifier:
2138 * * gl_FrontSecondaryColor
2139 * * gl_BackSecondaryColor
2141 * * gl_SecondaryColor
2143 } else if (state
->language_version
>= 130
2144 && (strcmp(var
->name
, "gl_FrontColor") == 0
2145 || strcmp(var
->name
, "gl_BackColor") == 0
2146 || strcmp(var
->name
, "gl_FrontSecondaryColor") == 0
2147 || strcmp(var
->name
, "gl_BackSecondaryColor") == 0
2148 || strcmp(var
->name
, "gl_Color") == 0
2149 || strcmp(var
->name
, "gl_SecondaryColor") == 0)
2150 && earlier
->type
== var
->type
2151 && earlier
->mode
== var
->mode
) {
2152 earlier
->interpolation
= var
->interpolation
;
2154 /* Layout qualifiers for gl_FragDepth. */
2155 } else if (state
->AMD_conservative_depth_enable
2156 && strcmp(var
->name
, "gl_FragDepth") == 0
2157 && earlier
->type
== var
->type
2158 && earlier
->mode
== var
->mode
) {
2160 /** From the AMD_conservative_depth spec:
2161 * Within any shader, the first redeclarations of gl_FragDepth
2162 * must appear before any use of gl_FragDepth.
2164 if (earlier
->used
) {
2165 _mesa_glsl_error(&loc
, state
,
2166 "the first redeclaration of gl_FragDepth "
2167 "must appear before any use of gl_FragDepth");
2170 /* Prevent inconsistent redeclaration of depth layout qualifier. */
2171 if (earlier
->depth_layout
!= ir_depth_layout_none
2172 && earlier
->depth_layout
!= var
->depth_layout
) {
2173 _mesa_glsl_error(&loc
, state
,
2174 "gl_FragDepth: depth layout is declared here "
2175 "as '%s, but it was previously declared as "
2177 depth_layout_string(var
->depth_layout
),
2178 depth_layout_string(earlier
->depth_layout
));
2181 earlier
->depth_layout
= var
->depth_layout
;
2184 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", decl
->identifier
);
2191 * Generate the IR for an initializer in a variable declaration
2194 process_initializer(ir_variable
*var
, ast_declaration
*decl
,
2195 ast_fully_specified_type
*type
,
2196 exec_list
*initializer_instructions
,
2197 struct _mesa_glsl_parse_state
*state
)
2199 ir_rvalue
*result
= NULL
;
2201 YYLTYPE initializer_loc
= decl
->initializer
->get_location();
2203 /* From page 24 (page 30 of the PDF) of the GLSL 1.10 spec:
2205 * "All uniform variables are read-only and are initialized either
2206 * directly by an application via API commands, or indirectly by
2209 if ((state
->language_version
<= 110)
2210 && (var
->mode
== ir_var_uniform
)) {
2211 _mesa_glsl_error(& initializer_loc
, state
,
2212 "cannot initialize uniforms in GLSL 1.10");
2215 if (var
->type
->is_sampler()) {
2216 _mesa_glsl_error(& initializer_loc
, state
,
2217 "cannot initialize samplers");
2220 if ((var
->mode
== ir_var_in
) && (state
->current_function
== NULL
)) {
2221 _mesa_glsl_error(& initializer_loc
, state
,
2222 "cannot initialize %s shader input / %s",
2223 _mesa_glsl_shader_target_name(state
->target
),
2224 (state
->target
== vertex_shader
)
2225 ? "attribute" : "varying");
2228 ir_dereference
*const lhs
= new(state
) ir_dereference_variable(var
);
2229 ir_rvalue
*rhs
= decl
->initializer
->hir(initializer_instructions
,
2232 /* Calculate the constant value if this is a const or uniform
2235 if (type
->qualifier
.flags
.q
.constant
2236 || type
->qualifier
.flags
.q
.uniform
) {
2237 ir_rvalue
*new_rhs
= validate_assignment(state
, var
->type
, rhs
);
2238 if (new_rhs
!= NULL
) {
2241 ir_constant
*constant_value
= rhs
->constant_expression_value();
2242 if (!constant_value
) {
2243 _mesa_glsl_error(& initializer_loc
, state
,
2244 "initializer of %s variable `%s' must be a "
2245 "constant expression",
2246 (type
->qualifier
.flags
.q
.constant
)
2247 ? "const" : "uniform",
2249 if (var
->type
->is_numeric()) {
2250 /* Reduce cascading errors. */
2251 var
->constant_value
= ir_constant::zero(state
, var
->type
);
2254 rhs
= constant_value
;
2255 var
->constant_value
= constant_value
;
2258 _mesa_glsl_error(&initializer_loc
, state
,
2259 "initializer of type %s cannot be assigned to "
2260 "variable of type %s",
2261 rhs
->type
->name
, var
->type
->name
);
2262 if (var
->type
->is_numeric()) {
2263 /* Reduce cascading errors. */
2264 var
->constant_value
= ir_constant::zero(state
, var
->type
);
2269 if (rhs
&& !rhs
->type
->is_error()) {
2270 bool temp
= var
->read_only
;
2271 if (type
->qualifier
.flags
.q
.constant
)
2272 var
->read_only
= false;
2274 /* Never emit code to initialize a uniform.
2276 const glsl_type
*initializer_type
;
2277 if (!type
->qualifier
.flags
.q
.uniform
) {
2278 result
= do_assignment(initializer_instructions
, state
,
2280 type
->get_location());
2281 initializer_type
= result
->type
;
2283 initializer_type
= rhs
->type
;
2285 /* If the declared variable is an unsized array, it must inherrit
2286 * its full type from the initializer. A declaration such as
2288 * uniform float a[] = float[](1.0, 2.0, 3.0, 3.0);
2292 * uniform float a[4] = float[](1.0, 2.0, 3.0, 3.0);
2294 * The assignment generated in the if-statement (below) will also
2295 * automatically handle this case for non-uniforms.
2297 * If the declared variable is not an array, the types must
2298 * already match exactly. As a result, the type assignment
2299 * here can be done unconditionally. For non-uniforms the call
2300 * to do_assignment can change the type of the initializer (via
2301 * the implicit conversion rules). For uniforms the initializer
2302 * must be a constant expression, and the type of that expression
2303 * was validated above.
2305 var
->type
= initializer_type
;
2307 var
->read_only
= temp
;
2314 ast_declarator_list::hir(exec_list
*instructions
,
2315 struct _mesa_glsl_parse_state
*state
)
2318 const struct glsl_type
*decl_type
;
2319 const char *type_name
= NULL
;
2320 ir_rvalue
*result
= NULL
;
2321 YYLTYPE loc
= this->get_location();
2323 /* From page 46 (page 52 of the PDF) of the GLSL 1.50 spec:
2325 * "To ensure that a particular output variable is invariant, it is
2326 * necessary to use the invariant qualifier. It can either be used to
2327 * qualify a previously declared variable as being invariant
2329 * invariant gl_Position; // make existing gl_Position be invariant"
2331 * In these cases the parser will set the 'invariant' flag in the declarator
2332 * list, and the type will be NULL.
2334 if (this->invariant
) {
2335 assert(this->type
== NULL
);
2337 if (state
->current_function
!= NULL
) {
2338 _mesa_glsl_error(& loc
, state
,
2339 "All uses of `invariant' keyword must be at global "
2343 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
2344 assert(!decl
->is_array
);
2345 assert(decl
->array_size
== NULL
);
2346 assert(decl
->initializer
== NULL
);
2348 ir_variable
*const earlier
=
2349 state
->symbols
->get_variable(decl
->identifier
);
2350 if (earlier
== NULL
) {
2351 _mesa_glsl_error(& loc
, state
,
2352 "Undeclared variable `%s' cannot be marked "
2353 "invariant\n", decl
->identifier
);
2354 } else if ((state
->target
== vertex_shader
)
2355 && (earlier
->mode
!= ir_var_out
)) {
2356 _mesa_glsl_error(& loc
, state
,
2357 "`%s' cannot be marked invariant, vertex shader "
2358 "outputs only\n", decl
->identifier
);
2359 } else if ((state
->target
== fragment_shader
)
2360 && (earlier
->mode
!= ir_var_in
)) {
2361 _mesa_glsl_error(& loc
, state
,
2362 "`%s' cannot be marked invariant, fragment shader "
2363 "inputs only\n", decl
->identifier
);
2364 } else if (earlier
->used
) {
2365 _mesa_glsl_error(& loc
, state
,
2366 "variable `%s' may not be redeclared "
2367 "`invariant' after being used",
2370 earlier
->invariant
= true;
2374 /* Invariant redeclarations do not have r-values.
2379 assert(this->type
!= NULL
);
2380 assert(!this->invariant
);
2382 /* The type specifier may contain a structure definition. Process that
2383 * before any of the variable declarations.
2385 (void) this->type
->specifier
->hir(instructions
, state
);
2387 decl_type
= this->type
->specifier
->glsl_type(& type_name
, state
);
2388 if (this->declarations
.is_empty()) {
2389 /* The only valid case where the declaration list can be empty is when
2390 * the declaration is setting the default precision of a built-in type
2391 * (e.g., 'precision highp vec4;').
2394 if (decl_type
!= NULL
) {
2396 _mesa_glsl_error(& loc
, state
, "incomplete declaration");
2400 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
2401 const struct glsl_type
*var_type
;
2404 /* FINISHME: Emit a warning if a variable declaration shadows a
2405 * FINISHME: declaration at a higher scope.
2408 if ((decl_type
== NULL
) || decl_type
->is_void()) {
2409 if (type_name
!= NULL
) {
2410 _mesa_glsl_error(& loc
, state
,
2411 "invalid type `%s' in declaration of `%s'",
2412 type_name
, decl
->identifier
);
2414 _mesa_glsl_error(& loc
, state
,
2415 "invalid type in declaration of `%s'",
2421 if (decl
->is_array
) {
2422 var_type
= process_array_type(&loc
, decl_type
, decl
->array_size
,
2425 var_type
= decl_type
;
2428 var
= new(ctx
) ir_variable(var_type
, decl
->identifier
, ir_var_auto
);
2430 /* From page 22 (page 28 of the PDF) of the GLSL 1.10 specification;
2432 * "Global variables can only use the qualifiers const,
2433 * attribute, uni form, or varying. Only one may be
2436 * Local variables can only use the qualifier const."
2438 * This is relaxed in GLSL 1.30. It is also relaxed by any extension
2439 * that adds the 'layout' keyword.
2441 if ((state
->language_version
< 130)
2442 && !state
->ARB_explicit_attrib_location_enable
2443 && !state
->ARB_fragment_coord_conventions_enable
) {
2444 if (this->type
->qualifier
.flags
.q
.out
) {
2445 _mesa_glsl_error(& loc
, state
,
2446 "`out' qualifier in declaration of `%s' "
2447 "only valid for function parameters in %s.",
2448 decl
->identifier
, state
->version_string
);
2450 if (this->type
->qualifier
.flags
.q
.in
) {
2451 _mesa_glsl_error(& loc
, state
,
2452 "`in' qualifier in declaration of `%s' "
2453 "only valid for function parameters in %s.",
2454 decl
->identifier
, state
->version_string
);
2456 /* FINISHME: Test for other invalid qualifiers. */
2459 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
,
2462 if (this->type
->qualifier
.flags
.q
.invariant
) {
2463 if ((state
->target
== vertex_shader
) && !(var
->mode
== ir_var_out
||
2464 var
->mode
== ir_var_inout
)) {
2465 /* FINISHME: Note that this doesn't work for invariant on
2466 * a function signature outval
2468 _mesa_glsl_error(& loc
, state
,
2469 "`%s' cannot be marked invariant, vertex shader "
2470 "outputs only\n", var
->name
);
2471 } else if ((state
->target
== fragment_shader
) &&
2472 !(var
->mode
== ir_var_in
|| var
->mode
== ir_var_inout
)) {
2473 /* FINISHME: Note that this doesn't work for invariant on
2474 * a function signature inval
2476 _mesa_glsl_error(& loc
, state
,
2477 "`%s' cannot be marked invariant, fragment shader "
2478 "inputs only\n", var
->name
);
2482 if (state
->current_function
!= NULL
) {
2483 const char *mode
= NULL
;
2484 const char *extra
= "";
2486 /* There is no need to check for 'inout' here because the parser will
2487 * only allow that in function parameter lists.
2489 if (this->type
->qualifier
.flags
.q
.attribute
) {
2491 } else if (this->type
->qualifier
.flags
.q
.uniform
) {
2493 } else if (this->type
->qualifier
.flags
.q
.varying
) {
2495 } else if (this->type
->qualifier
.flags
.q
.in
) {
2497 extra
= " or in function parameter list";
2498 } else if (this->type
->qualifier
.flags
.q
.out
) {
2500 extra
= " or in function parameter list";
2504 _mesa_glsl_error(& loc
, state
,
2505 "%s variable `%s' must be declared at "
2507 mode
, var
->name
, extra
);
2509 } else if (var
->mode
== ir_var_in
) {
2510 var
->read_only
= true;
2512 if (state
->target
== vertex_shader
) {
2513 bool error_emitted
= false;
2515 /* From page 31 (page 37 of the PDF) of the GLSL 1.50 spec:
2517 * "Vertex shader inputs can only be float, floating-point
2518 * vectors, matrices, signed and unsigned integers and integer
2519 * vectors. Vertex shader inputs can also form arrays of these
2520 * types, but not structures."
2522 * From page 31 (page 27 of the PDF) of the GLSL 1.30 spec:
2524 * "Vertex shader inputs can only be float, floating-point
2525 * vectors, matrices, signed and unsigned integers and integer
2526 * vectors. They cannot be arrays or structures."
2528 * From page 23 (page 29 of the PDF) of the GLSL 1.20 spec:
2530 * "The attribute qualifier can be used only with float,
2531 * floating-point vectors, and matrices. Attribute variables
2532 * cannot be declared as arrays or structures."
2534 const glsl_type
*check_type
= var
->type
->is_array()
2535 ? var
->type
->fields
.array
: var
->type
;
2537 switch (check_type
->base_type
) {
2538 case GLSL_TYPE_FLOAT
:
2540 case GLSL_TYPE_UINT
:
2542 if (state
->language_version
> 120)
2546 _mesa_glsl_error(& loc
, state
,
2547 "vertex shader input / attribute cannot have "
2549 var
->type
->is_array() ? "array of " : "",
2551 error_emitted
= true;
2554 if (!error_emitted
&& (state
->language_version
<= 130)
2555 && var
->type
->is_array()) {
2556 _mesa_glsl_error(& loc
, state
,
2557 "vertex shader input / attribute cannot have "
2559 error_emitted
= true;
2564 /* Integer vertex outputs must be qualified with 'flat'.
2566 * From section 4.3.6 of the GLSL 1.30 spec:
2567 * "If a vertex output is a signed or unsigned integer or integer
2568 * vector, then it must be qualified with the interpolation qualifier
2571 if (state
->language_version
>= 130
2572 && state
->target
== vertex_shader
2573 && state
->current_function
== NULL
2574 && var
->type
->is_integer()
2575 && var
->mode
== ir_var_out
2576 && var
->interpolation
!= ir_var_flat
) {
2578 _mesa_glsl_error(&loc
, state
, "If a vertex output is an integer, "
2579 "then it must be qualified with 'flat'");
2583 /* Interpolation qualifiers cannot be applied to 'centroid' and
2584 * 'centroid varying'.
2586 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
2587 * "interpolation qualifiers may only precede the qualifiers in,
2588 * centroid in, out, or centroid out in a declaration. They do not apply
2589 * to the deprecated storage qualifiers varying or centroid varying."
2591 if (state
->language_version
>= 130
2592 && this->type
->qualifier
.has_interpolation()
2593 && this->type
->qualifier
.flags
.q
.varying
) {
2595 const char *i
= this->type
->qualifier
.interpolation_string();
2598 if (this->type
->qualifier
.flags
.q
.centroid
)
2599 s
= "centroid varying";
2603 _mesa_glsl_error(&loc
, state
,
2604 "qualifier '%s' cannot be applied to the "
2605 "deprecated storage qualifier '%s'", i
, s
);
2609 /* Interpolation qualifiers can only apply to vertex shader outputs and
2610 * fragment shader inputs.
2612 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
2613 * "Outputs from a vertex shader (out) and inputs to a fragment
2614 * shader (in) can be further qualified with one or more of these
2615 * interpolation qualifiers"
2617 if (state
->language_version
>= 130
2618 && this->type
->qualifier
.has_interpolation()) {
2620 const char *i
= this->type
->qualifier
.interpolation_string();
2623 switch (state
->target
) {
2625 if (this->type
->qualifier
.flags
.q
.in
) {
2626 _mesa_glsl_error(&loc
, state
,
2627 "qualifier '%s' cannot be applied to vertex "
2628 "shader inputs", i
);
2631 case fragment_shader
:
2632 if (this->type
->qualifier
.flags
.q
.out
) {
2633 _mesa_glsl_error(&loc
, state
,
2634 "qualifier '%s' cannot be applied to fragment "
2635 "shader outputs", i
);
2644 /* From section 4.3.4 of the GLSL 1.30 spec:
2645 * "It is an error to use centroid in in a vertex shader."
2647 if (state
->language_version
>= 130
2648 && this->type
->qualifier
.flags
.q
.centroid
2649 && this->type
->qualifier
.flags
.q
.in
2650 && state
->target
== vertex_shader
) {
2652 _mesa_glsl_error(&loc
, state
,
2653 "'centroid in' cannot be used in a vertex shader");
2657 /* Precision qualifiers exists only in GLSL versions 1.00 and >= 1.30.
2659 if (this->type
->specifier
->precision
!= ast_precision_none
2660 && state
->language_version
!= 100
2661 && state
->language_version
< 130) {
2663 _mesa_glsl_error(&loc
, state
,
2664 "precision qualifiers are supported only in GLSL ES "
2665 "1.00, and GLSL 1.30 and later");
2669 /* Precision qualifiers only apply to floating point and integer types.
2671 * From section 4.5.2 of the GLSL 1.30 spec:
2672 * "Any floating point or any integer declaration can have the type
2673 * preceded by one of these precision qualifiers [...] Literal
2674 * constants do not have precision qualifiers. Neither do Boolean
2677 if (this->type
->specifier
->precision
!= ast_precision_none
2678 && !var
->type
->is_float()
2679 && !var
->type
->is_integer()
2680 && !(var
->type
->is_array()
2681 && (var
->type
->fields
.array
->is_float()
2682 || var
->type
->fields
.array
->is_integer()))) {
2684 _mesa_glsl_error(&loc
, state
,
2685 "precision qualifiers apply only to floating point "
2686 "and integer types");
2689 /* Process the initializer and add its instructions to a temporary
2690 * list. This list will be added to the instruction stream (below) after
2691 * the declaration is added. This is done because in some cases (such as
2692 * redeclarations) the declaration may not actually be added to the
2693 * instruction stream.
2695 exec_list initializer_instructions
;
2696 ir_variable
*earlier
= get_variable_being_redeclared(var
, decl
, state
);
2698 if (decl
->initializer
!= NULL
) {
2699 result
= process_initializer((earlier
== NULL
) ? var
: earlier
,
2701 &initializer_instructions
, state
);
2704 /* From page 23 (page 29 of the PDF) of the GLSL 1.10 spec:
2706 * "It is an error to write to a const variable outside of
2707 * its declaration, so they must be initialized when
2710 if (this->type
->qualifier
.flags
.q
.constant
&& decl
->initializer
== NULL
) {
2711 _mesa_glsl_error(& loc
, state
,
2712 "const declaration of `%s' must be initialized",
2716 /* If the declaration is not a redeclaration, there are a few additional
2717 * semantic checks that must be applied. In addition, variable that was
2718 * created for the declaration should be added to the IR stream.
2720 if (earlier
== NULL
) {
2721 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
2723 * "Identifiers starting with "gl_" are reserved for use by
2724 * OpenGL, and may not be declared in a shader as either a
2725 * variable or a function."
2727 if (strncmp(decl
->identifier
, "gl_", 3) == 0)
2728 _mesa_glsl_error(& loc
, state
,
2729 "identifier `%s' uses reserved `gl_' prefix",
2732 /* Add the variable to the symbol table. Note that the initializer's
2733 * IR was already processed earlier (though it hasn't been emitted
2734 * yet), without the variable in scope.
2736 * This differs from most C-like languages, but it follows the GLSL
2737 * specification. From page 28 (page 34 of the PDF) of the GLSL 1.50
2740 * "Within a declaration, the scope of a name starts immediately
2741 * after the initializer if present or immediately after the name
2742 * being declared if not."
2744 if (!state
->symbols
->add_variable(var
)) {
2745 YYLTYPE loc
= this->get_location();
2746 _mesa_glsl_error(&loc
, state
, "name `%s' already taken in the "
2747 "current scope", decl
->identifier
);
2751 /* Push the variable declaration to the top. It means that all the
2752 * variable declarations will appear in a funny last-to-first order,
2753 * but otherwise we run into trouble if a function is prototyped, a
2754 * global var is decled, then the function is defined with usage of
2755 * the global var. See glslparsertest's CorrectModule.frag.
2757 instructions
->push_head(var
);
2760 instructions
->append_list(&initializer_instructions
);
2764 /* Generally, variable declarations do not have r-values. However,
2765 * one is used for the declaration in
2767 * while (bool b = some_condition()) {
2771 * so we return the rvalue from the last seen declaration here.
2778 ast_parameter_declarator::hir(exec_list
*instructions
,
2779 struct _mesa_glsl_parse_state
*state
)
2782 const struct glsl_type
*type
;
2783 const char *name
= NULL
;
2784 YYLTYPE loc
= this->get_location();
2786 type
= this->type
->specifier
->glsl_type(& name
, state
);
2790 _mesa_glsl_error(& loc
, state
,
2791 "invalid type `%s' in declaration of `%s'",
2792 name
, this->identifier
);
2794 _mesa_glsl_error(& loc
, state
,
2795 "invalid type in declaration of `%s'",
2799 type
= glsl_type::error_type
;
2802 /* From page 62 (page 68 of the PDF) of the GLSL 1.50 spec:
2804 * "Functions that accept no input arguments need not use void in the
2805 * argument list because prototypes (or definitions) are required and
2806 * therefore there is no ambiguity when an empty argument list "( )" is
2807 * declared. The idiom "(void)" as a parameter list is provided for
2810 * Placing this check here prevents a void parameter being set up
2811 * for a function, which avoids tripping up checks for main taking
2812 * parameters and lookups of an unnamed symbol.
2814 if (type
->is_void()) {
2815 if (this->identifier
!= NULL
)
2816 _mesa_glsl_error(& loc
, state
,
2817 "named parameter cannot have type `void'");
2823 if (formal_parameter
&& (this->identifier
== NULL
)) {
2824 _mesa_glsl_error(& loc
, state
, "formal parameter lacks a name");
2828 /* This only handles "vec4 foo[..]". The earlier specifier->glsl_type(...)
2829 * call already handled the "vec4[..] foo" case.
2831 if (this->is_array
) {
2832 type
= process_array_type(&loc
, type
, this->array_size
, state
);
2835 if (type
->array_size() == 0) {
2836 _mesa_glsl_error(&loc
, state
, "arrays passed as parameters must have "
2837 "a declared size.");
2838 type
= glsl_type::error_type
;
2842 ir_variable
*var
= new(ctx
) ir_variable(type
, this->identifier
, ir_var_in
);
2844 /* Apply any specified qualifiers to the parameter declaration. Note that
2845 * for function parameters the default mode is 'in'.
2847 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
, & loc
);
2849 instructions
->push_tail(var
);
2851 /* Parameter declarations do not have r-values.
2858 ast_parameter_declarator::parameters_to_hir(exec_list
*ast_parameters
,
2860 exec_list
*ir_parameters
,
2861 _mesa_glsl_parse_state
*state
)
2863 ast_parameter_declarator
*void_param
= NULL
;
2866 foreach_list_typed (ast_parameter_declarator
, param
, link
, ast_parameters
) {
2867 param
->formal_parameter
= formal
;
2868 param
->hir(ir_parameters
, state
);
2876 if ((void_param
!= NULL
) && (count
> 1)) {
2877 YYLTYPE loc
= void_param
->get_location();
2879 _mesa_glsl_error(& loc
, state
,
2880 "`void' parameter must be only parameter");
2886 emit_function(_mesa_glsl_parse_state
*state
, exec_list
*instructions
,
2889 /* Emit the new function header */
2890 if (state
->current_function
== NULL
) {
2891 instructions
->push_tail(f
);
2893 /* IR invariants disallow function declarations or definitions nested
2894 * within other function definitions. Insert the new ir_function
2895 * block in the instruction sequence before the ir_function block
2896 * containing the current ir_function_signature.
2898 ir_function
*const curr
=
2899 const_cast<ir_function
*>(state
->current_function
->function());
2901 curr
->insert_before(f
);
2907 ast_function::hir(exec_list
*instructions
,
2908 struct _mesa_glsl_parse_state
*state
)
2911 ir_function
*f
= NULL
;
2912 ir_function_signature
*sig
= NULL
;
2913 exec_list hir_parameters
;
2915 const char *const name
= identifier
;
2917 /* From page 21 (page 27 of the PDF) of the GLSL 1.20 spec,
2919 * "Function declarations (prototypes) cannot occur inside of functions;
2920 * they must be at global scope, or for the built-in functions, outside
2921 * the global scope."
2923 * From page 27 (page 33 of the PDF) of the GLSL ES 1.00.16 spec,
2925 * "User defined functions may only be defined within the global scope."
2927 * Note that this language does not appear in GLSL 1.10.
2929 if ((state
->current_function
!= NULL
) && (state
->language_version
!= 110)) {
2930 YYLTYPE loc
= this->get_location();
2931 _mesa_glsl_error(&loc
, state
,
2932 "declaration of function `%s' not allowed within "
2933 "function body", name
);
2936 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
2938 * "Identifiers starting with "gl_" are reserved for use by
2939 * OpenGL, and may not be declared in a shader as either a
2940 * variable or a function."
2942 if (strncmp(name
, "gl_", 3) == 0) {
2943 YYLTYPE loc
= this->get_location();
2944 _mesa_glsl_error(&loc
, state
,
2945 "identifier `%s' uses reserved `gl_' prefix", name
);
2948 /* Convert the list of function parameters to HIR now so that they can be
2949 * used below to compare this function's signature with previously seen
2950 * signatures for functions with the same name.
2952 ast_parameter_declarator::parameters_to_hir(& this->parameters
,
2954 & hir_parameters
, state
);
2956 const char *return_type_name
;
2957 const glsl_type
*return_type
=
2958 this->return_type
->specifier
->glsl_type(& return_type_name
, state
);
2961 YYLTYPE loc
= this->get_location();
2962 _mesa_glsl_error(&loc
, state
,
2963 "function `%s' has undeclared return type `%s'",
2964 name
, return_type_name
);
2965 return_type
= glsl_type::error_type
;
2968 /* From page 56 (page 62 of the PDF) of the GLSL 1.30 spec:
2969 * "No qualifier is allowed on the return type of a function."
2971 if (this->return_type
->has_qualifiers()) {
2972 YYLTYPE loc
= this->get_location();
2973 _mesa_glsl_error(& loc
, state
,
2974 "function `%s' return type has qualifiers", name
);
2977 /* Verify that this function's signature either doesn't match a previously
2978 * seen signature for a function with the same name, or, if a match is found,
2979 * that the previously seen signature does not have an associated definition.
2981 f
= state
->symbols
->get_function(name
);
2982 if (f
!= NULL
&& (state
->es_shader
|| f
->has_user_signature())) {
2983 sig
= f
->exact_matching_signature(&hir_parameters
);
2985 const char *badvar
= sig
->qualifiers_match(&hir_parameters
);
2986 if (badvar
!= NULL
) {
2987 YYLTYPE loc
= this->get_location();
2989 _mesa_glsl_error(&loc
, state
, "function `%s' parameter `%s' "
2990 "qualifiers don't match prototype", name
, badvar
);
2993 if (sig
->return_type
!= return_type
) {
2994 YYLTYPE loc
= this->get_location();
2996 _mesa_glsl_error(&loc
, state
, "function `%s' return type doesn't "
2997 "match prototype", name
);
3000 if (is_definition
&& sig
->is_defined
) {
3001 YYLTYPE loc
= this->get_location();
3003 _mesa_glsl_error(& loc
, state
, "function `%s' redefined", name
);
3007 f
= new(ctx
) ir_function(name
);
3008 if (!state
->symbols
->add_function(f
)) {
3009 /* This function name shadows a non-function use of the same name. */
3010 YYLTYPE loc
= this->get_location();
3012 _mesa_glsl_error(&loc
, state
, "function name `%s' conflicts with "
3013 "non-function", name
);
3017 emit_function(state
, instructions
, f
);
3020 /* Verify the return type of main() */
3021 if (strcmp(name
, "main") == 0) {
3022 if (! return_type
->is_void()) {
3023 YYLTYPE loc
= this->get_location();
3025 _mesa_glsl_error(& loc
, state
, "main() must return void");
3028 if (!hir_parameters
.is_empty()) {
3029 YYLTYPE loc
= this->get_location();
3031 _mesa_glsl_error(& loc
, state
, "main() must not take any parameters");
3035 /* Finish storing the information about this new function in its signature.
3038 sig
= new(ctx
) ir_function_signature(return_type
);
3039 f
->add_signature(sig
);
3042 sig
->replace_parameters(&hir_parameters
);
3045 /* Function declarations (prototypes) do not have r-values.
3052 ast_function_definition::hir(exec_list
*instructions
,
3053 struct _mesa_glsl_parse_state
*state
)
3055 prototype
->is_definition
= true;
3056 prototype
->hir(instructions
, state
);
3058 ir_function_signature
*signature
= prototype
->signature
;
3059 if (signature
== NULL
)
3062 assert(state
->current_function
== NULL
);
3063 state
->current_function
= signature
;
3064 state
->found_return
= false;
3066 /* Duplicate parameters declared in the prototype as concrete variables.
3067 * Add these to the symbol table.
3069 state
->symbols
->push_scope();
3070 foreach_iter(exec_list_iterator
, iter
, signature
->parameters
) {
3071 ir_variable
*const var
= ((ir_instruction
*) iter
.get())->as_variable();
3073 assert(var
!= NULL
);
3075 /* The only way a parameter would "exist" is if two parameters have
3078 if (state
->symbols
->name_declared_this_scope(var
->name
)) {
3079 YYLTYPE loc
= this->get_location();
3081 _mesa_glsl_error(& loc
, state
, "parameter `%s' redeclared", var
->name
);
3083 state
->symbols
->add_variable(var
);
3087 /* Convert the body of the function to HIR. */
3088 this->body
->hir(&signature
->body
, state
);
3089 signature
->is_defined
= true;
3091 state
->symbols
->pop_scope();
3093 assert(state
->current_function
== signature
);
3094 state
->current_function
= NULL
;
3096 if (!signature
->return_type
->is_void() && !state
->found_return
) {
3097 YYLTYPE loc
= this->get_location();
3098 _mesa_glsl_error(& loc
, state
, "function `%s' has non-void return type "
3099 "%s, but no return statement",
3100 signature
->function_name(),
3101 signature
->return_type
->name
);
3104 /* Function definitions do not have r-values.
3111 ast_jump_statement::hir(exec_list
*instructions
,
3112 struct _mesa_glsl_parse_state
*state
)
3119 assert(state
->current_function
);
3121 if (opt_return_value
) {
3122 ir_rvalue
*const ret
= opt_return_value
->hir(instructions
, state
);
3124 /* The value of the return type can be NULL if the shader says
3125 * 'return foo();' and foo() is a function that returns void.
3127 * NOTE: The GLSL spec doesn't say that this is an error. The type
3128 * of the return value is void. If the return type of the function is
3129 * also void, then this should compile without error. Seriously.
3131 const glsl_type
*const ret_type
=
3132 (ret
== NULL
) ? glsl_type::void_type
: ret
->type
;
3134 /* Implicit conversions are not allowed for return values. */
3135 if (state
->current_function
->return_type
!= ret_type
) {
3136 YYLTYPE loc
= this->get_location();
3138 _mesa_glsl_error(& loc
, state
,
3139 "`return' with wrong type %s, in function `%s' "
3142 state
->current_function
->function_name(),
3143 state
->current_function
->return_type
->name
);
3146 inst
= new(ctx
) ir_return(ret
);
3148 if (state
->current_function
->return_type
->base_type
!=
3150 YYLTYPE loc
= this->get_location();
3152 _mesa_glsl_error(& loc
, state
,
3153 "`return' with no value, in function %s returning "
3155 state
->current_function
->function_name());
3157 inst
= new(ctx
) ir_return
;
3160 state
->found_return
= true;
3161 instructions
->push_tail(inst
);
3166 if (state
->target
!= fragment_shader
) {
3167 YYLTYPE loc
= this->get_location();
3169 _mesa_glsl_error(& loc
, state
,
3170 "`discard' may only appear in a fragment shader");
3172 instructions
->push_tail(new(ctx
) ir_discard
);
3177 /* FINISHME: Handle switch-statements. They cannot contain 'continue',
3178 * FINISHME: and they use a different IR instruction for 'break'.
3180 /* FINISHME: Correctly handle the nesting. If a switch-statement is
3181 * FINISHME: inside a loop, a 'continue' is valid and will bind to the
3184 if (state
->loop_or_switch_nesting
== NULL
) {
3185 YYLTYPE loc
= this->get_location();
3187 _mesa_glsl_error(& loc
, state
,
3188 "`%s' may only appear in a loop",
3189 (mode
== ast_break
) ? "break" : "continue");
3191 ir_loop
*const loop
= state
->loop_or_switch_nesting
->as_loop();
3193 /* Inline the for loop expression again, since we don't know
3194 * where near the end of the loop body the normal copy of it
3195 * is going to be placed.
3197 if (mode
== ast_continue
&&
3198 state
->loop_or_switch_nesting_ast
->rest_expression
) {
3199 state
->loop_or_switch_nesting_ast
->rest_expression
->hir(instructions
,
3204 ir_loop_jump
*const jump
=
3205 new(ctx
) ir_loop_jump((mode
== ast_break
)
3206 ? ir_loop_jump::jump_break
3207 : ir_loop_jump::jump_continue
);
3208 instructions
->push_tail(jump
);
3215 /* Jump instructions do not have r-values.
3222 ast_selection_statement::hir(exec_list
*instructions
,
3223 struct _mesa_glsl_parse_state
*state
)
3227 ir_rvalue
*const condition
= this->condition
->hir(instructions
, state
);
3229 /* From page 66 (page 72 of the PDF) of the GLSL 1.50 spec:
3231 * "Any expression whose type evaluates to a Boolean can be used as the
3232 * conditional expression bool-expression. Vector types are not accepted
3233 * as the expression to if."
3235 * The checks are separated so that higher quality diagnostics can be
3236 * generated for cases where both rules are violated.
3238 if (!condition
->type
->is_boolean() || !condition
->type
->is_scalar()) {
3239 YYLTYPE loc
= this->condition
->get_location();
3241 _mesa_glsl_error(& loc
, state
, "if-statement condition must be scalar "
3245 ir_if
*const stmt
= new(ctx
) ir_if(condition
);
3247 if (then_statement
!= NULL
) {
3248 state
->symbols
->push_scope();
3249 then_statement
->hir(& stmt
->then_instructions
, state
);
3250 state
->symbols
->pop_scope();
3253 if (else_statement
!= NULL
) {
3254 state
->symbols
->push_scope();
3255 else_statement
->hir(& stmt
->else_instructions
, state
);
3256 state
->symbols
->pop_scope();
3259 instructions
->push_tail(stmt
);
3261 /* if-statements do not have r-values.
3268 ast_iteration_statement::condition_to_hir(ir_loop
*stmt
,
3269 struct _mesa_glsl_parse_state
*state
)
3273 if (condition
!= NULL
) {
3274 ir_rvalue
*const cond
=
3275 condition
->hir(& stmt
->body_instructions
, state
);
3278 || !cond
->type
->is_boolean() || !cond
->type
->is_scalar()) {
3279 YYLTYPE loc
= condition
->get_location();
3281 _mesa_glsl_error(& loc
, state
,
3282 "loop condition must be scalar boolean");
3284 /* As the first code in the loop body, generate a block that looks
3285 * like 'if (!condition) break;' as the loop termination condition.
3287 ir_rvalue
*const not_cond
=
3288 new(ctx
) ir_expression(ir_unop_logic_not
, glsl_type::bool_type
, cond
,
3291 ir_if
*const if_stmt
= new(ctx
) ir_if(not_cond
);
3293 ir_jump
*const break_stmt
=
3294 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
3296 if_stmt
->then_instructions
.push_tail(break_stmt
);
3297 stmt
->body_instructions
.push_tail(if_stmt
);
3304 ast_iteration_statement::hir(exec_list
*instructions
,
3305 struct _mesa_glsl_parse_state
*state
)
3309 /* For-loops and while-loops start a new scope, but do-while loops do not.
3311 if (mode
!= ast_do_while
)
3312 state
->symbols
->push_scope();
3314 if (init_statement
!= NULL
)
3315 init_statement
->hir(instructions
, state
);
3317 ir_loop
*const stmt
= new(ctx
) ir_loop();
3318 instructions
->push_tail(stmt
);
3320 /* Track the current loop and / or switch-statement nesting.
3322 ir_instruction
*const nesting
= state
->loop_or_switch_nesting
;
3323 ast_iteration_statement
*nesting_ast
= state
->loop_or_switch_nesting_ast
;
3325 state
->loop_or_switch_nesting
= stmt
;
3326 state
->loop_or_switch_nesting_ast
= this;
3328 if (mode
!= ast_do_while
)
3329 condition_to_hir(stmt
, state
);
3332 body
->hir(& stmt
->body_instructions
, state
);
3334 if (rest_expression
!= NULL
)
3335 rest_expression
->hir(& stmt
->body_instructions
, state
);
3337 if (mode
== ast_do_while
)
3338 condition_to_hir(stmt
, state
);
3340 if (mode
!= ast_do_while
)
3341 state
->symbols
->pop_scope();
3343 /* Restore previous nesting before returning.
3345 state
->loop_or_switch_nesting
= nesting
;
3346 state
->loop_or_switch_nesting_ast
= nesting_ast
;
3348 /* Loops do not have r-values.
3355 ast_type_specifier::hir(exec_list
*instructions
,
3356 struct _mesa_glsl_parse_state
*state
)
3358 if (!this->is_precision_statement
&& this->structure
== NULL
)
3361 YYLTYPE loc
= this->get_location();
3363 if (this->precision
!= ast_precision_none
3364 && state
->language_version
!= 100
3365 && state
->language_version
< 130) {
3366 _mesa_glsl_error(&loc
, state
,
3367 "precision qualifiers exist only in "
3368 "GLSL ES 1.00, and GLSL 1.30 and later");
3371 if (this->precision
!= ast_precision_none
3372 && this->structure
!= NULL
) {
3373 _mesa_glsl_error(&loc
, state
,
3374 "precision qualifiers do not apply to structures");
3378 /* If this is a precision statement, check that the type to which it is
3379 * applied is either float or int.
3381 * From section 4.5.3 of the GLSL 1.30 spec:
3382 * "The precision statement
3383 * precision precision-qualifier type;
3384 * can be used to establish a default precision qualifier. The type
3385 * field can be either int or float [...]. Any other types or
3386 * qualifiers will result in an error.
3388 if (this->is_precision_statement
) {
3389 assert(this->precision
!= ast_precision_none
);
3390 assert(this->structure
== NULL
); /* The check for structures was
3391 * performed above. */
3392 if (this->is_array
) {
3393 _mesa_glsl_error(&loc
, state
,
3394 "default precision statements do not apply to "
3398 if (this->type_specifier
!= ast_float
3399 && this->type_specifier
!= ast_int
) {
3400 _mesa_glsl_error(&loc
, state
,
3401 "default precision statements apply only to types "
3406 /* FINISHME: Translate precision statements into IR. */
3410 if (this->structure
!= NULL
)
3411 return this->structure
->hir(instructions
, state
);
3418 ast_struct_specifier::hir(exec_list
*instructions
,
3419 struct _mesa_glsl_parse_state
*state
)
3421 unsigned decl_count
= 0;
3423 /* Make an initial pass over the list of structure fields to determine how
3424 * many there are. Each element in this list is an ast_declarator_list.
3425 * This means that we actually need to count the number of elements in the
3426 * 'declarations' list in each of the elements.
3428 foreach_list_typed (ast_declarator_list
, decl_list
, link
,
3429 &this->declarations
) {
3430 foreach_list_const (decl_ptr
, & decl_list
->declarations
) {
3435 /* Allocate storage for the structure fields and process the field
3436 * declarations. As the declarations are processed, try to also convert
3437 * the types to HIR. This ensures that structure definitions embedded in
3438 * other structure definitions are processed.
3440 glsl_struct_field
*const fields
= ralloc_array(state
, glsl_struct_field
,
3444 foreach_list_typed (ast_declarator_list
, decl_list
, link
,
3445 &this->declarations
) {
3446 const char *type_name
;
3448 decl_list
->type
->specifier
->hir(instructions
, state
);
3450 /* Section 10.9 of the GLSL ES 1.00 specification states that
3451 * embedded structure definitions have been removed from the language.
3453 if (state
->es_shader
&& decl_list
->type
->specifier
->structure
!= NULL
) {
3454 YYLTYPE loc
= this->get_location();
3455 _mesa_glsl_error(&loc
, state
, "Embedded structure definitions are "
3456 "not allowed in GLSL ES 1.00.");
3459 const glsl_type
*decl_type
=
3460 decl_list
->type
->specifier
->glsl_type(& type_name
, state
);
3462 foreach_list_typed (ast_declaration
, decl
, link
,
3463 &decl_list
->declarations
) {
3464 const struct glsl_type
*field_type
= decl_type
;
3465 if (decl
->is_array
) {
3466 YYLTYPE loc
= decl
->get_location();
3467 field_type
= process_array_type(&loc
, decl_type
, decl
->array_size
,
3470 fields
[i
].type
= (field_type
!= NULL
)
3471 ? field_type
: glsl_type::error_type
;
3472 fields
[i
].name
= decl
->identifier
;
3477 assert(i
== decl_count
);
3479 const glsl_type
*t
=
3480 glsl_type::get_record_instance(fields
, decl_count
, this->name
);
3482 YYLTYPE loc
= this->get_location();
3483 if (!state
->symbols
->add_type(name
, t
)) {
3484 _mesa_glsl_error(& loc
, state
, "struct `%s' previously defined", name
);
3486 const glsl_type
**s
= reralloc(state
, state
->user_structures
,
3488 state
->num_user_structures
+ 1);
3490 s
[state
->num_user_structures
] = t
;
3491 state
->user_structures
= s
;
3492 state
->num_user_structures
++;
3496 /* Structure type definitions do not have r-values.