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
,
609 /* If there is already some error in the RHS, just return it. Anything
610 * else will lead to an avalanche of error message back to the user.
612 if (rhs
->type
->is_error())
615 /* If the types are identical, the assignment can trivially proceed.
617 if (rhs
->type
== lhs_type
)
620 /* If the array element types are the same and the size of the LHS is zero,
621 * the assignment is okay for initializers embedded in variable
624 * Note: Whole-array assignments are not permitted in GLSL 1.10, but this
625 * is handled by ir_dereference::is_lvalue.
627 if (is_initializer
&& lhs_type
->is_array() && rhs
->type
->is_array()
628 && (lhs_type
->element_type() == rhs
->type
->element_type())
629 && (lhs_type
->array_size() == 0)) {
633 /* Check for implicit conversion in GLSL 1.20 */
634 if (apply_implicit_conversion(lhs_type
, rhs
, state
)) {
635 if (rhs
->type
== lhs_type
)
643 do_assignment(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
,
644 ir_rvalue
*lhs
, ir_rvalue
*rhs
, bool is_initializer
,
648 bool error_emitted
= (lhs
->type
->is_error() || rhs
->type
->is_error());
650 if (!error_emitted
) {
651 if (lhs
->variable_referenced() != NULL
652 && lhs
->variable_referenced()->read_only
) {
653 _mesa_glsl_error(&lhs_loc
, state
,
654 "assignment to read-only variable '%s'",
655 lhs
->variable_referenced()->name
);
656 error_emitted
= true;
658 } else if (!lhs
->is_lvalue()) {
659 _mesa_glsl_error(& lhs_loc
, state
, "non-lvalue in assignment");
660 error_emitted
= true;
663 if (state
->es_shader
&& lhs
->type
->is_array()) {
664 _mesa_glsl_error(&lhs_loc
, state
, "whole array assignment is not "
665 "allowed in GLSL ES 1.00.");
666 error_emitted
= true;
671 validate_assignment(state
, lhs
->type
, rhs
, is_initializer
);
672 if (new_rhs
== NULL
) {
673 _mesa_glsl_error(& lhs_loc
, state
, "type mismatch");
677 /* If the LHS array was not declared with a size, it takes it size from
678 * the RHS. If the LHS is an l-value and a whole array, it must be a
679 * dereference of a variable. Any other case would require that the LHS
680 * is either not an l-value or not a whole array.
682 if (lhs
->type
->array_size() == 0) {
683 ir_dereference
*const d
= lhs
->as_dereference();
687 ir_variable
*const var
= d
->variable_referenced();
691 if (var
->max_array_access
>= unsigned(rhs
->type
->array_size())) {
692 /* FINISHME: This should actually log the location of the RHS. */
693 _mesa_glsl_error(& lhs_loc
, state
, "array size must be > %u due to "
695 var
->max_array_access
);
698 var
->type
= glsl_type::get_array_instance(lhs
->type
->element_type(),
699 rhs
->type
->array_size());
704 /* Most callers of do_assignment (assign, add_assign, pre_inc/dec,
705 * but not post_inc) need the converted assigned value as an rvalue
706 * to handle things like:
710 * So we always just store the computed value being assigned to a
711 * temporary and return a deref of that temporary. If the rvalue
712 * ends up not being used, the temp will get copy-propagated out.
714 ir_variable
*var
= new(ctx
) ir_variable(rhs
->type
, "assignment_tmp",
716 ir_dereference_variable
*deref_var
= new(ctx
) ir_dereference_variable(var
);
717 instructions
->push_tail(var
);
718 instructions
->push_tail(new(ctx
) ir_assignment(deref_var
,
721 deref_var
= new(ctx
) ir_dereference_variable(var
);
724 instructions
->push_tail(new(ctx
) ir_assignment(lhs
, deref_var
, NULL
));
726 return new(ctx
) ir_dereference_variable(var
);
730 get_lvalue_copy(exec_list
*instructions
, ir_rvalue
*lvalue
)
732 void *ctx
= ralloc_parent(lvalue
);
735 var
= new(ctx
) ir_variable(lvalue
->type
, "_post_incdec_tmp",
737 instructions
->push_tail(var
);
738 var
->mode
= ir_var_auto
;
740 instructions
->push_tail(new(ctx
) ir_assignment(new(ctx
) ir_dereference_variable(var
),
743 /* Once we've created this temporary, mark it read only so it's no
744 * longer considered an lvalue.
746 var
->read_only
= true;
748 return new(ctx
) ir_dereference_variable(var
);
753 ast_node::hir(exec_list
*instructions
,
754 struct _mesa_glsl_parse_state
*state
)
763 mark_whole_array_access(ir_rvalue
*access
)
765 ir_dereference_variable
*deref
= access
->as_dereference_variable();
768 deref
->var
->max_array_access
= deref
->type
->length
- 1;
773 do_comparison(void *mem_ctx
, int operation
, ir_rvalue
*op0
, ir_rvalue
*op1
)
776 ir_rvalue
*cmp
= NULL
;
778 if (operation
== ir_binop_all_equal
)
779 join_op
= ir_binop_logic_and
;
781 join_op
= ir_binop_logic_or
;
783 switch (op0
->type
->base_type
) {
784 case GLSL_TYPE_FLOAT
:
788 return new(mem_ctx
) ir_expression(operation
, op0
, op1
);
790 case GLSL_TYPE_ARRAY
: {
791 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
792 ir_rvalue
*e0
, *e1
, *result
;
794 e0
= new(mem_ctx
) ir_dereference_array(op0
->clone(mem_ctx
, NULL
),
795 new(mem_ctx
) ir_constant(i
));
796 e1
= new(mem_ctx
) ir_dereference_array(op1
->clone(mem_ctx
, NULL
),
797 new(mem_ctx
) ir_constant(i
));
798 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
801 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
807 mark_whole_array_access(op0
);
808 mark_whole_array_access(op1
);
812 case GLSL_TYPE_STRUCT
: {
813 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
814 ir_rvalue
*e0
, *e1
, *result
;
815 const char *field_name
= op0
->type
->fields
.structure
[i
].name
;
817 e0
= new(mem_ctx
) ir_dereference_record(op0
->clone(mem_ctx
, NULL
),
819 e1
= new(mem_ctx
) ir_dereference_record(op1
->clone(mem_ctx
, NULL
),
821 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
824 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
832 case GLSL_TYPE_ERROR
:
834 case GLSL_TYPE_SAMPLER
:
835 /* I assume a comparison of a struct containing a sampler just
836 * ignores the sampler present in the type.
841 assert(!"Should not get here.");
846 cmp
= new(mem_ctx
) ir_constant(true);
851 /* For logical operations, we want to ensure that the operands are
852 * scalar booleans. If it isn't, emit an error and return a constant
853 * boolean to avoid triggering cascading error messages.
856 get_scalar_boolean_operand(exec_list
*instructions
,
857 struct _mesa_glsl_parse_state
*state
,
858 ast_expression
*parent_expr
,
860 const char *operand_name
,
863 ast_expression
*expr
= parent_expr
->subexpressions
[operand
];
865 ir_rvalue
*val
= expr
->hir(instructions
, state
);
867 if (val
->type
->is_boolean() && val
->type
->is_scalar())
870 if (!*error_emitted
) {
871 YYLTYPE loc
= expr
->get_location();
872 _mesa_glsl_error(&loc
, state
, "%s of `%s' must be scalar boolean",
874 parent_expr
->operator_string(parent_expr
->oper
));
875 *error_emitted
= true;
878 return new(ctx
) ir_constant(true);
882 ast_expression::hir(exec_list
*instructions
,
883 struct _mesa_glsl_parse_state
*state
)
886 static const int operations
[AST_NUM_OPERATORS
] = {
887 -1, /* ast_assign doesn't convert to ir_expression. */
888 -1, /* ast_plus doesn't convert to ir_expression. */
912 /* Note: The following block of expression types actually convert
913 * to multiple IR instructions.
915 ir_binop_mul
, /* ast_mul_assign */
916 ir_binop_div
, /* ast_div_assign */
917 ir_binop_mod
, /* ast_mod_assign */
918 ir_binop_add
, /* ast_add_assign */
919 ir_binop_sub
, /* ast_sub_assign */
920 ir_binop_lshift
, /* ast_ls_assign */
921 ir_binop_rshift
, /* ast_rs_assign */
922 ir_binop_bit_and
, /* ast_and_assign */
923 ir_binop_bit_xor
, /* ast_xor_assign */
924 ir_binop_bit_or
, /* ast_or_assign */
926 -1, /* ast_conditional doesn't convert to ir_expression. */
927 ir_binop_add
, /* ast_pre_inc. */
928 ir_binop_sub
, /* ast_pre_dec. */
929 ir_binop_add
, /* ast_post_inc. */
930 ir_binop_sub
, /* ast_post_dec. */
931 -1, /* ast_field_selection doesn't conv to ir_expression. */
932 -1, /* ast_array_index doesn't convert to ir_expression. */
933 -1, /* ast_function_call doesn't conv to ir_expression. */
934 -1, /* ast_identifier doesn't convert to ir_expression. */
935 -1, /* ast_int_constant doesn't convert to ir_expression. */
936 -1, /* ast_uint_constant doesn't conv to ir_expression. */
937 -1, /* ast_float_constant doesn't conv to ir_expression. */
938 -1, /* ast_bool_constant doesn't conv to ir_expression. */
939 -1, /* ast_sequence doesn't convert to ir_expression. */
941 ir_rvalue
*result
= NULL
;
943 const struct glsl_type
*type
= glsl_type::error_type
;
944 bool error_emitted
= false;
947 loc
= this->get_location();
949 switch (this->oper
) {
951 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
952 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
954 result
= do_assignment(instructions
, state
, op
[0], op
[1], false,
955 this->subexpressions
[0]->get_location());
956 error_emitted
= result
->type
->is_error();
962 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
964 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
966 error_emitted
= type
->is_error();
972 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
974 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
976 error_emitted
= type
->is_error();
978 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
986 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
987 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
989 type
= arithmetic_result_type(op
[0], op
[1],
990 (this->oper
== ast_mul
),
992 error_emitted
= type
->is_error();
994 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
999 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1000 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1002 type
= modulus_result_type(op
[0]->type
, op
[1]->type
, state
, & loc
);
1004 assert(operations
[this->oper
] == ir_binop_mod
);
1006 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1008 error_emitted
= type
->is_error();
1013 if (state
->language_version
< 130) {
1014 _mesa_glsl_error(&loc
, state
, "operator %s requires GLSL 1.30",
1015 operator_string(this->oper
));
1016 error_emitted
= true;
1019 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1020 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1021 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1023 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1025 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1032 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1033 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1035 type
= relational_result_type(op
[0], op
[1], state
, & loc
);
1037 /* The relational operators must either generate an error or result
1038 * in a scalar boolean. See page 57 of the GLSL 1.50 spec.
1040 assert(type
->is_error()
1041 || ((type
->base_type
== GLSL_TYPE_BOOL
)
1042 && type
->is_scalar()));
1044 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1046 error_emitted
= type
->is_error();
1051 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1052 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1054 /* From page 58 (page 64 of the PDF) of the GLSL 1.50 spec:
1056 * "The equality operators equal (==), and not equal (!=)
1057 * operate on all types. They result in a scalar Boolean. If
1058 * the operand types do not match, then there must be a
1059 * conversion from Section 4.1.10 "Implicit Conversions"
1060 * applied to one operand that can make them match, in which
1061 * case this conversion is done."
1063 if ((!apply_implicit_conversion(op
[0]->type
, op
[1], state
)
1064 && !apply_implicit_conversion(op
[1]->type
, op
[0], state
))
1065 || (op
[0]->type
!= op
[1]->type
)) {
1066 _mesa_glsl_error(& loc
, state
, "operands of `%s' must have the same "
1067 "type", (this->oper
== ast_equal
) ? "==" : "!=");
1068 error_emitted
= true;
1069 } else if ((state
->language_version
<= 110)
1070 && (op
[0]->type
->is_array() || op
[1]->type
->is_array())) {
1071 _mesa_glsl_error(& loc
, state
, "array comparisons forbidden in "
1073 error_emitted
= true;
1076 if (error_emitted
) {
1077 result
= new(ctx
) ir_constant(false);
1079 result
= do_comparison(ctx
, operations
[this->oper
], op
[0], op
[1]);
1080 assert(result
->type
== glsl_type::bool_type
);
1081 type
= glsl_type::bool_type
;
1089 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1090 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1091 type
= bit_logic_result_type(op
[0]->type
, op
[1]->type
, this->oper
,
1093 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1095 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1099 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1101 if (state
->language_version
< 130) {
1102 _mesa_glsl_error(&loc
, state
, "bit-wise operations require GLSL 1.30");
1103 error_emitted
= true;
1106 if (!op
[0]->type
->is_integer()) {
1107 _mesa_glsl_error(&loc
, state
, "operand of `~' must be an integer");
1108 error_emitted
= true;
1112 result
= new(ctx
) ir_expression(ir_unop_bit_not
, type
, op
[0], NULL
);
1115 case ast_logic_and
: {
1116 exec_list rhs_instructions
;
1117 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1118 "LHS", &error_emitted
);
1119 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1120 "RHS", &error_emitted
);
1122 ir_constant
*op0_const
= op
[0]->constant_expression_value();
1124 if (op0_const
->value
.b
[0]) {
1125 instructions
->append_list(&rhs_instructions
);
1130 type
= glsl_type::bool_type
;
1132 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1135 instructions
->push_tail(tmp
);
1137 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1138 instructions
->push_tail(stmt
);
1140 stmt
->then_instructions
.append_list(&rhs_instructions
);
1141 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1142 ir_assignment
*const then_assign
=
1143 new(ctx
) ir_assignment(then_deref
, op
[1], NULL
);
1144 stmt
->then_instructions
.push_tail(then_assign
);
1146 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1147 ir_assignment
*const else_assign
=
1148 new(ctx
) ir_assignment(else_deref
, new(ctx
) ir_constant(false), NULL
);
1149 stmt
->else_instructions
.push_tail(else_assign
);
1151 result
= new(ctx
) ir_dereference_variable(tmp
);
1157 case ast_logic_or
: {
1158 exec_list rhs_instructions
;
1159 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1160 "LHS", &error_emitted
);
1161 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1162 "RHS", &error_emitted
);
1164 ir_constant
*op0_const
= op
[0]->constant_expression_value();
1166 if (op0_const
->value
.b
[0]) {
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 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1182 ir_assignment
*const then_assign
=
1183 new(ctx
) ir_assignment(then_deref
, new(ctx
) ir_constant(true), NULL
);
1184 stmt
->then_instructions
.push_tail(then_assign
);
1186 stmt
->else_instructions
.append_list(&rhs_instructions
);
1187 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1188 ir_assignment
*const else_assign
=
1189 new(ctx
) ir_assignment(else_deref
, op
[1], NULL
);
1190 stmt
->else_instructions
.push_tail(else_assign
);
1192 result
= new(ctx
) ir_dereference_variable(tmp
);
1199 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1201 * "The logical binary operators and (&&), or ( | | ), and
1202 * exclusive or (^^). They operate only on two Boolean
1203 * expressions and result in a Boolean expression."
1205 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0, "LHS",
1207 op
[1] = get_scalar_boolean_operand(instructions
, state
, this, 1, "RHS",
1210 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1212 type
= glsl_type::bool_type
;
1216 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1217 "operand", &error_emitted
);
1219 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1221 type
= glsl_type::bool_type
;
1224 case ast_mul_assign
:
1225 case ast_div_assign
:
1226 case ast_add_assign
:
1227 case ast_sub_assign
: {
1228 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1229 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1231 type
= arithmetic_result_type(op
[0], op
[1],
1232 (this->oper
== ast_mul_assign
),
1235 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1238 result
= do_assignment(instructions
, state
,
1239 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1240 this->subexpressions
[0]->get_location());
1241 type
= result
->type
;
1242 error_emitted
= (op
[0]->type
->is_error());
1244 /* GLSL 1.10 does not allow array assignment. However, we don't have to
1245 * explicitly test for this because none of the binary expression
1246 * operators allow array operands either.
1252 case ast_mod_assign
: {
1253 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1254 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1256 type
= modulus_result_type(op
[0]->type
, op
[1]->type
, state
, & loc
);
1258 assert(operations
[this->oper
] == ir_binop_mod
);
1260 ir_rvalue
*temp_rhs
;
1261 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1264 result
= do_assignment(instructions
, state
,
1265 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1266 this->subexpressions
[0]->get_location());
1267 type
= result
->type
;
1268 error_emitted
= type
->is_error();
1273 case ast_rs_assign
: {
1274 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1275 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1276 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1278 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1279 type
, op
[0], op
[1]);
1280 result
= do_assignment(instructions
, state
, op
[0]->clone(ctx
, NULL
),
1282 this->subexpressions
[0]->get_location());
1283 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1287 case ast_and_assign
:
1288 case ast_xor_assign
:
1289 case ast_or_assign
: {
1290 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1291 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1292 type
= bit_logic_result_type(op
[0]->type
, op
[1]->type
, this->oper
,
1294 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1295 type
, op
[0], op
[1]);
1296 result
= do_assignment(instructions
, state
, op
[0]->clone(ctx
, NULL
),
1298 this->subexpressions
[0]->get_location());
1299 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1303 case ast_conditional
: {
1304 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1306 * "The ternary selection operator (?:). It operates on three
1307 * expressions (exp1 ? exp2 : exp3). This operator evaluates the
1308 * first expression, which must result in a scalar Boolean."
1310 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1311 "condition", &error_emitted
);
1313 /* The :? operator is implemented by generating an anonymous temporary
1314 * followed by an if-statement. The last instruction in each branch of
1315 * the if-statement assigns a value to the anonymous temporary. This
1316 * temporary is the r-value of the expression.
1318 exec_list then_instructions
;
1319 exec_list else_instructions
;
1321 op
[1] = this->subexpressions
[1]->hir(&then_instructions
, state
);
1322 op
[2] = this->subexpressions
[2]->hir(&else_instructions
, state
);
1324 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1326 * "The second and third expressions can be any type, as
1327 * long their types match, or there is a conversion in
1328 * Section 4.1.10 "Implicit Conversions" that can be applied
1329 * to one of the expressions to make their types match. This
1330 * resulting matching type is the type of the entire
1333 if ((!apply_implicit_conversion(op
[1]->type
, op
[2], state
)
1334 && !apply_implicit_conversion(op
[2]->type
, op
[1], state
))
1335 || (op
[1]->type
!= op
[2]->type
)) {
1336 YYLTYPE loc
= this->subexpressions
[1]->get_location();
1338 _mesa_glsl_error(& loc
, state
, "Second and third operands of ?: "
1339 "operator must have matching types.");
1340 error_emitted
= true;
1341 type
= glsl_type::error_type
;
1346 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1348 * "The second and third expressions must be the same type, but can
1349 * be of any type other than an array."
1351 if ((state
->language_version
<= 110) && type
->is_array()) {
1352 _mesa_glsl_error(& loc
, state
, "Second and third operands of ?: "
1353 "operator must not be arrays.");
1354 error_emitted
= true;
1357 ir_constant
*cond_val
= op
[0]->constant_expression_value();
1358 ir_constant
*then_val
= op
[1]->constant_expression_value();
1359 ir_constant
*else_val
= op
[2]->constant_expression_value();
1361 if (then_instructions
.is_empty()
1362 && else_instructions
.is_empty()
1363 && (cond_val
!= NULL
) && (then_val
!= NULL
) && (else_val
!= NULL
)) {
1364 result
= (cond_val
->value
.b
[0]) ? then_val
: else_val
;
1366 ir_variable
*const tmp
=
1367 new(ctx
) ir_variable(type
, "conditional_tmp", ir_var_temporary
);
1368 instructions
->push_tail(tmp
);
1370 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1371 instructions
->push_tail(stmt
);
1373 then_instructions
.move_nodes_to(& stmt
->then_instructions
);
1374 ir_dereference
*const then_deref
=
1375 new(ctx
) ir_dereference_variable(tmp
);
1376 ir_assignment
*const then_assign
=
1377 new(ctx
) ir_assignment(then_deref
, op
[1], NULL
);
1378 stmt
->then_instructions
.push_tail(then_assign
);
1380 else_instructions
.move_nodes_to(& stmt
->else_instructions
);
1381 ir_dereference
*const else_deref
=
1382 new(ctx
) ir_dereference_variable(tmp
);
1383 ir_assignment
*const else_assign
=
1384 new(ctx
) ir_assignment(else_deref
, op
[2], NULL
);
1385 stmt
->else_instructions
.push_tail(else_assign
);
1387 result
= new(ctx
) ir_dereference_variable(tmp
);
1394 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1395 if (op
[0]->type
->base_type
== GLSL_TYPE_FLOAT
)
1396 op
[1] = new(ctx
) ir_constant(1.0f
);
1398 op
[1] = new(ctx
) ir_constant(1);
1400 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1402 ir_rvalue
*temp_rhs
;
1403 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1406 result
= do_assignment(instructions
, state
,
1407 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1408 this->subexpressions
[0]->get_location());
1409 type
= result
->type
;
1410 error_emitted
= op
[0]->type
->is_error();
1415 case ast_post_dec
: {
1416 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1417 if (op
[0]->type
->base_type
== GLSL_TYPE_FLOAT
)
1418 op
[1] = new(ctx
) ir_constant(1.0f
);
1420 op
[1] = new(ctx
) ir_constant(1);
1422 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1424 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1426 ir_rvalue
*temp_rhs
;
1427 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1430 /* Get a temporary of a copy of the lvalue before it's modified.
1431 * This may get thrown away later.
1433 result
= get_lvalue_copy(instructions
, op
[0]->clone(ctx
, NULL
));
1435 (void)do_assignment(instructions
, state
,
1436 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1437 this->subexpressions
[0]->get_location());
1439 type
= result
->type
;
1440 error_emitted
= op
[0]->type
->is_error();
1444 case ast_field_selection
:
1445 result
= _mesa_ast_field_selection_to_hir(this, instructions
, state
);
1446 type
= result
->type
;
1449 case ast_array_index
: {
1450 YYLTYPE index_loc
= subexpressions
[1]->get_location();
1452 op
[0] = subexpressions
[0]->hir(instructions
, state
);
1453 op
[1] = subexpressions
[1]->hir(instructions
, state
);
1455 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1457 ir_rvalue
*const array
= op
[0];
1459 result
= new(ctx
) ir_dereference_array(op
[0], op
[1]);
1461 /* Do not use op[0] after this point. Use array.
1469 if (!array
->type
->is_array()
1470 && !array
->type
->is_matrix()
1471 && !array
->type
->is_vector()) {
1472 _mesa_glsl_error(& index_loc
, state
,
1473 "cannot dereference non-array / non-matrix / "
1475 error_emitted
= true;
1478 if (!op
[1]->type
->is_integer()) {
1479 _mesa_glsl_error(& index_loc
, state
,
1480 "array index must be integer type");
1481 error_emitted
= true;
1482 } else if (!op
[1]->type
->is_scalar()) {
1483 _mesa_glsl_error(& index_loc
, state
,
1484 "array index must be scalar");
1485 error_emitted
= true;
1488 /* If the array index is a constant expression and the array has a
1489 * declared size, ensure that the access is in-bounds. If the array
1490 * index is not a constant expression, ensure that the array has a
1493 ir_constant
*const const_index
= op
[1]->constant_expression_value();
1494 if (const_index
!= NULL
) {
1495 const int idx
= const_index
->value
.i
[0];
1496 const char *type_name
;
1499 if (array
->type
->is_matrix()) {
1500 type_name
= "matrix";
1501 } else if (array
->type
->is_vector()) {
1502 type_name
= "vector";
1504 type_name
= "array";
1507 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec:
1509 * "It is illegal to declare an array with a size, and then
1510 * later (in the same shader) index the same array with an
1511 * integral constant expression greater than or equal to the
1512 * declared size. It is also illegal to index an array with a
1513 * negative constant expression."
1515 if (array
->type
->is_matrix()) {
1516 if (array
->type
->row_type()->vector_elements
<= idx
) {
1517 bound
= array
->type
->row_type()->vector_elements
;
1519 } else if (array
->type
->is_vector()) {
1520 if (array
->type
->vector_elements
<= idx
) {
1521 bound
= array
->type
->vector_elements
;
1524 if ((array
->type
->array_size() > 0)
1525 && (array
->type
->array_size() <= idx
)) {
1526 bound
= array
->type
->array_size();
1531 _mesa_glsl_error(& loc
, state
, "%s index must be < %u",
1533 error_emitted
= true;
1534 } else if (idx
< 0) {
1535 _mesa_glsl_error(& loc
, state
, "%s index must be >= 0",
1537 error_emitted
= true;
1540 if (array
->type
->is_array()) {
1541 /* If the array is a variable dereference, it dereferences the
1542 * whole array, by definition. Use this to get the variable.
1544 * FINISHME: Should some methods for getting / setting / testing
1545 * FINISHME: array access limits be added to ir_dereference?
1547 ir_variable
*const v
= array
->whole_variable_referenced();
1548 if ((v
!= NULL
) && (unsigned(idx
) > v
->max_array_access
))
1549 v
->max_array_access
= idx
;
1551 } else if (array
->type
->array_size() == 0) {
1552 _mesa_glsl_error(&loc
, state
, "unsized array index must be constant");
1554 if (array
->type
->is_array()) {
1555 /* whole_variable_referenced can return NULL if the array is a
1556 * member of a structure. In this case it is safe to not update
1557 * the max_array_access field because it is never used for fields
1560 ir_variable
*v
= array
->whole_variable_referenced();
1562 v
->max_array_access
= array
->type
->array_size() - 1;
1566 /* From page 23 (29 of the PDF) of the GLSL 1.30 spec:
1568 * "Samplers aggregated into arrays within a shader (using square
1569 * brackets [ ]) can only be indexed with integral constant
1570 * expressions [...]."
1572 * This restriction was added in GLSL 1.30. Shaders using earlier version
1573 * of the language should not be rejected by the compiler front-end for
1574 * using this construct. This allows useful things such as using a loop
1575 * counter as the index to an array of samplers. If the loop in unrolled,
1576 * the code should compile correctly. Instead, emit a warning.
1578 if (array
->type
->is_array() &&
1579 array
->type
->element_type()->is_sampler() &&
1580 const_index
== NULL
) {
1582 if (state
->language_version
== 100) {
1583 _mesa_glsl_warning(&loc
, state
,
1584 "sampler arrays indexed with non-constant "
1585 "expressions is optional in GLSL ES 1.00");
1586 } else if (state
->language_version
< 130) {
1587 _mesa_glsl_warning(&loc
, state
,
1588 "sampler arrays indexed with non-constant "
1589 "expressions is forbidden in GLSL 1.30 and "
1592 _mesa_glsl_error(&loc
, state
,
1593 "sampler arrays indexed with non-constant "
1594 "expressions is forbidden in GLSL 1.30 and "
1596 error_emitted
= true;
1601 result
->type
= glsl_type::error_type
;
1603 type
= result
->type
;
1607 case ast_function_call
:
1608 /* Should *NEVER* get here. ast_function_call should always be handled
1609 * by ast_function_expression::hir.
1614 case ast_identifier
: {
1615 /* ast_identifier can appear several places in a full abstract syntax
1616 * tree. This particular use must be at location specified in the grammar
1617 * as 'variable_identifier'.
1620 state
->symbols
->get_variable(this->primary_expression
.identifier
);
1622 result
= new(ctx
) ir_dereference_variable(var
);
1626 type
= result
->type
;
1628 _mesa_glsl_error(& loc
, state
, "`%s' undeclared",
1629 this->primary_expression
.identifier
);
1631 error_emitted
= true;
1636 case ast_int_constant
:
1637 type
= glsl_type::int_type
;
1638 result
= new(ctx
) ir_constant(this->primary_expression
.int_constant
);
1641 case ast_uint_constant
:
1642 type
= glsl_type::uint_type
;
1643 result
= new(ctx
) ir_constant(this->primary_expression
.uint_constant
);
1646 case ast_float_constant
:
1647 type
= glsl_type::float_type
;
1648 result
= new(ctx
) ir_constant(this->primary_expression
.float_constant
);
1651 case ast_bool_constant
:
1652 type
= glsl_type::bool_type
;
1653 result
= new(ctx
) ir_constant(bool(this->primary_expression
.bool_constant
));
1656 case ast_sequence
: {
1657 /* It should not be possible to generate a sequence in the AST without
1658 * any expressions in it.
1660 assert(!this->expressions
.is_empty());
1662 /* The r-value of a sequence is the last expression in the sequence. If
1663 * the other expressions in the sequence do not have side-effects (and
1664 * therefore add instructions to the instruction list), they get dropped
1667 exec_node
*previous_tail_pred
= NULL
;
1668 YYLTYPE previous_operand_loc
= loc
;
1670 foreach_list_typed (ast_node
, ast
, link
, &this->expressions
) {
1671 /* If one of the operands of comma operator does not generate any
1672 * code, we want to emit a warning. At each pass through the loop
1673 * previous_tail_pred will point to the last instruction in the
1674 * stream *before* processing the previous operand. Naturally,
1675 * instructions->tail_pred will point to the last instruction in the
1676 * stream *after* processing the previous operand. If the two
1677 * pointers match, then the previous operand had no effect.
1679 * The warning behavior here differs slightly from GCC. GCC will
1680 * only emit a warning if none of the left-hand operands have an
1681 * effect. However, it will emit a warning for each. I believe that
1682 * there are some cases in C (especially with GCC extensions) where
1683 * it is useful to have an intermediate step in a sequence have no
1684 * effect, but I don't think these cases exist in GLSL. Either way,
1685 * it would be a giant hassle to replicate that behavior.
1687 if (previous_tail_pred
== instructions
->tail_pred
) {
1688 _mesa_glsl_warning(&previous_operand_loc
, state
,
1689 "left-hand operand of comma expression has "
1693 /* tail_pred is directly accessed instead of using the get_tail()
1694 * method for performance reasons. get_tail() has extra code to
1695 * return NULL when the list is empty. We don't care about that
1696 * here, so using tail_pred directly is fine.
1698 previous_tail_pred
= instructions
->tail_pred
;
1699 previous_operand_loc
= ast
->get_location();
1701 result
= ast
->hir(instructions
, state
);
1704 type
= result
->type
;
1706 /* Any errors should have already been emitted in the loop above.
1708 error_emitted
= true;
1713 if (type
->is_error() && !error_emitted
)
1714 _mesa_glsl_error(& loc
, state
, "type mismatch");
1721 ast_expression_statement::hir(exec_list
*instructions
,
1722 struct _mesa_glsl_parse_state
*state
)
1724 /* It is possible to have expression statements that don't have an
1725 * expression. This is the solitary semicolon:
1727 * for (i = 0; i < 5; i++)
1730 * In this case the expression will be NULL. Test for NULL and don't do
1731 * anything in that case.
1733 if (expression
!= NULL
)
1734 expression
->hir(instructions
, state
);
1736 /* Statements do not have r-values.
1743 ast_compound_statement::hir(exec_list
*instructions
,
1744 struct _mesa_glsl_parse_state
*state
)
1747 state
->symbols
->push_scope();
1749 foreach_list_typed (ast_node
, ast
, link
, &this->statements
)
1750 ast
->hir(instructions
, state
);
1753 state
->symbols
->pop_scope();
1755 /* Compound statements do not have r-values.
1761 static const glsl_type
*
1762 process_array_type(YYLTYPE
*loc
, const glsl_type
*base
, ast_node
*array_size
,
1763 struct _mesa_glsl_parse_state
*state
)
1765 unsigned length
= 0;
1767 /* FINISHME: Reject delcarations of multidimensional arrays. */
1769 if (array_size
!= NULL
) {
1770 exec_list dummy_instructions
;
1771 ir_rvalue
*const ir
= array_size
->hir(& dummy_instructions
, state
);
1772 YYLTYPE loc
= array_size
->get_location();
1774 /* FINISHME: Verify that the grammar forbids side-effects in array
1775 * FINISHME: sizes. i.e., 'vec4 [x = 12] data'
1777 assert(dummy_instructions
.is_empty());
1780 if (!ir
->type
->is_integer()) {
1781 _mesa_glsl_error(& loc
, state
, "array size must be integer type");
1782 } else if (!ir
->type
->is_scalar()) {
1783 _mesa_glsl_error(& loc
, state
, "array size must be scalar type");
1785 ir_constant
*const size
= ir
->constant_expression_value();
1788 _mesa_glsl_error(& loc
, state
, "array size must be a "
1789 "constant valued expression");
1790 } else if (size
->value
.i
[0] <= 0) {
1791 _mesa_glsl_error(& loc
, state
, "array size must be > 0");
1793 assert(size
->type
== ir
->type
);
1794 length
= size
->value
.u
[0];
1798 } else if (state
->es_shader
) {
1799 /* Section 10.17 of the GLSL ES 1.00 specification states that unsized
1800 * array declarations have been removed from the language.
1802 _mesa_glsl_error(loc
, state
, "unsized array declarations are not "
1803 "allowed in GLSL ES 1.00.");
1806 return glsl_type::get_array_instance(base
, length
);
1811 ast_type_specifier::glsl_type(const char **name
,
1812 struct _mesa_glsl_parse_state
*state
) const
1814 const struct glsl_type
*type
;
1816 type
= state
->symbols
->get_type(this->type_name
);
1817 *name
= this->type_name
;
1819 if (this->is_array
) {
1820 YYLTYPE loc
= this->get_location();
1821 type
= process_array_type(&loc
, type
, this->array_size
, state
);
1829 apply_type_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
1831 struct _mesa_glsl_parse_state
*state
,
1834 if (qual
->flags
.q
.invariant
) {
1836 _mesa_glsl_error(loc
, state
,
1837 "variable `%s' may not be redeclared "
1838 "`invariant' after being used",
1845 if (qual
->flags
.q
.constant
|| qual
->flags
.q
.attribute
1846 || qual
->flags
.q
.uniform
1847 || (qual
->flags
.q
.varying
&& (state
->target
== fragment_shader
)))
1850 if (qual
->flags
.q
.centroid
)
1853 if (qual
->flags
.q
.attribute
&& state
->target
!= vertex_shader
) {
1854 var
->type
= glsl_type::error_type
;
1855 _mesa_glsl_error(loc
, state
,
1856 "`attribute' variables may not be declared in the "
1858 _mesa_glsl_shader_target_name(state
->target
));
1861 /* From page 25 (page 31 of the PDF) of the GLSL 1.10 spec:
1863 * "The varying qualifier can be used only with the data types
1864 * float, vec2, vec3, vec4, mat2, mat3, and mat4, or arrays of
1867 if (qual
->flags
.q
.varying
) {
1868 const glsl_type
*non_array_type
;
1870 if (var
->type
&& var
->type
->is_array())
1871 non_array_type
= var
->type
->fields
.array
;
1873 non_array_type
= var
->type
;
1875 if (non_array_type
&& non_array_type
->base_type
!= GLSL_TYPE_FLOAT
) {
1876 var
->type
= glsl_type::error_type
;
1877 _mesa_glsl_error(loc
, state
,
1878 "varying variables must be of base type float");
1882 /* If there is no qualifier that changes the mode of the variable, leave
1883 * the setting alone.
1885 if (qual
->flags
.q
.in
&& qual
->flags
.q
.out
)
1886 var
->mode
= ir_var_inout
;
1887 else if (qual
->flags
.q
.attribute
|| qual
->flags
.q
.in
1888 || (qual
->flags
.q
.varying
&& (state
->target
== fragment_shader
)))
1889 var
->mode
= ir_var_in
;
1890 else if (qual
->flags
.q
.out
1891 || (qual
->flags
.q
.varying
&& (state
->target
== vertex_shader
)))
1892 var
->mode
= ir_var_out
;
1893 else if (qual
->flags
.q
.uniform
)
1894 var
->mode
= ir_var_uniform
;
1896 if (state
->all_invariant
&& (state
->current_function
== NULL
)) {
1897 switch (state
->target
) {
1899 if (var
->mode
== ir_var_out
)
1900 var
->invariant
= true;
1902 case geometry_shader
:
1903 if ((var
->mode
== ir_var_in
) || (var
->mode
== ir_var_out
))
1904 var
->invariant
= true;
1906 case fragment_shader
:
1907 if (var
->mode
== ir_var_in
)
1908 var
->invariant
= true;
1913 if (qual
->flags
.q
.flat
)
1914 var
->interpolation
= ir_var_flat
;
1915 else if (qual
->flags
.q
.noperspective
)
1916 var
->interpolation
= ir_var_noperspective
;
1918 var
->interpolation
= ir_var_smooth
;
1920 var
->pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
1921 var
->origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
1922 if ((qual
->flags
.q
.origin_upper_left
|| qual
->flags
.q
.pixel_center_integer
)
1923 && (strcmp(var
->name
, "gl_FragCoord") != 0)) {
1924 const char *const qual_string
= (qual
->flags
.q
.origin_upper_left
)
1925 ? "origin_upper_left" : "pixel_center_integer";
1927 _mesa_glsl_error(loc
, state
,
1928 "layout qualifier `%s' can only be applied to "
1929 "fragment shader input `gl_FragCoord'",
1933 if (qual
->flags
.q
.explicit_location
) {
1934 const bool global_scope
= (state
->current_function
== NULL
);
1936 const char *string
= "";
1938 /* In the vertex shader only shader inputs can be given explicit
1941 * In the fragment shader only shader outputs can be given explicit
1944 switch (state
->target
) {
1946 if (!global_scope
|| (var
->mode
!= ir_var_in
)) {
1952 case geometry_shader
:
1953 _mesa_glsl_error(loc
, state
,
1954 "geometry shader variables cannot be given "
1955 "explicit locations\n");
1958 case fragment_shader
:
1959 if (!global_scope
|| (var
->mode
!= ir_var_in
)) {
1967 _mesa_glsl_error(loc
, state
,
1968 "only %s shader %s variables can be given an "
1969 "explicit location\n",
1970 _mesa_glsl_shader_target_name(state
->target
),
1973 var
->explicit_location
= true;
1975 /* This bit of silliness is needed because invalid explicit locations
1976 * are supposed to be flagged during linking. Small negative values
1977 * biased by VERT_ATTRIB_GENERIC0 or FRAG_RESULT_DATA0 could alias
1978 * built-in values (e.g., -16+VERT_ATTRIB_GENERIC0 = VERT_ATTRIB_POS).
1979 * The linker needs to be able to differentiate these cases. This
1980 * ensures that negative values stay negative.
1982 if (qual
->location
>= 0) {
1983 var
->location
= (state
->target
== vertex_shader
)
1984 ? (qual
->location
+ VERT_ATTRIB_GENERIC0
)
1985 : (qual
->location
+ FRAG_RESULT_DATA0
);
1987 var
->location
= qual
->location
;
1992 /* Does the declaration use the 'layout' keyword?
1994 const bool uses_layout
= qual
->flags
.q
.pixel_center_integer
1995 || qual
->flags
.q
.origin_upper_left
1996 || qual
->flags
.q
.explicit_location
;
1998 /* Does the declaration use the deprecated 'attribute' or 'varying'
2001 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
2002 || qual
->flags
.q
.varying
;
2004 /* Is the 'layout' keyword used with parameters that allow relaxed checking.
2005 * Many implementations of GL_ARB_fragment_coord_conventions_enable and some
2006 * implementations (only Mesa?) GL_ARB_explicit_attrib_location_enable
2007 * allowed the layout qualifier to be used with 'varying' and 'attribute'.
2008 * These extensions and all following extensions that add the 'layout'
2009 * keyword have been modified to require the use of 'in' or 'out'.
2011 * The following extension do not allow the deprecated keywords:
2013 * GL_AMD_conservative_depth
2014 * GL_ARB_gpu_shader5
2015 * GL_ARB_separate_shader_objects
2016 * GL_ARB_tesselation_shader
2017 * GL_ARB_transform_feedback3
2018 * GL_ARB_uniform_buffer_object
2020 * It is unknown whether GL_EXT_shader_image_load_store or GL_NV_gpu_shader5
2021 * allow layout with the deprecated keywords.
2023 const bool relaxed_layout_qualifier_checking
=
2024 state
->ARB_fragment_coord_conventions_enable
;
2026 if (uses_layout
&& uses_deprecated_qualifier
) {
2027 if (relaxed_layout_qualifier_checking
) {
2028 _mesa_glsl_warning(loc
, state
,
2029 "`layout' qualifier may not be used with "
2030 "`attribute' or `varying'");
2032 _mesa_glsl_error(loc
, state
,
2033 "`layout' qualifier may not be used with "
2034 "`attribute' or `varying'");
2038 /* Layout qualifiers for gl_FragDepth, which are enabled by extension
2039 * AMD_conservative_depth.
2041 int depth_layout_count
= qual
->flags
.q
.depth_any
2042 + qual
->flags
.q
.depth_greater
2043 + qual
->flags
.q
.depth_less
2044 + qual
->flags
.q
.depth_unchanged
;
2045 if (depth_layout_count
> 0
2046 && !state
->AMD_conservative_depth_enable
) {
2047 _mesa_glsl_error(loc
, state
,
2048 "extension GL_AMD_conservative_depth must be enabled "
2049 "to use depth layout qualifiers");
2050 } else if (depth_layout_count
> 0
2051 && strcmp(var
->name
, "gl_FragDepth") != 0) {
2052 _mesa_glsl_error(loc
, state
,
2053 "depth layout qualifiers can be applied only to "
2055 } else if (depth_layout_count
> 1
2056 && strcmp(var
->name
, "gl_FragDepth") == 0) {
2057 _mesa_glsl_error(loc
, state
,
2058 "at most one depth layout qualifier can be applied to "
2061 if (qual
->flags
.q
.depth_any
)
2062 var
->depth_layout
= ir_depth_layout_any
;
2063 else if (qual
->flags
.q
.depth_greater
)
2064 var
->depth_layout
= ir_depth_layout_greater
;
2065 else if (qual
->flags
.q
.depth_less
)
2066 var
->depth_layout
= ir_depth_layout_less
;
2067 else if (qual
->flags
.q
.depth_unchanged
)
2068 var
->depth_layout
= ir_depth_layout_unchanged
;
2070 var
->depth_layout
= ir_depth_layout_none
;
2072 if (var
->type
->is_array() && state
->language_version
!= 110) {
2073 var
->array_lvalue
= true;
2078 * Get the variable that is being redeclared by this declaration
2080 * Semantic checks to verify the validity of the redeclaration are also
2081 * performed. If semantic checks fail, compilation error will be emitted via
2082 * \c _mesa_glsl_error, but a non-\c NULL pointer will still be returned.
2085 * A pointer to an existing variable in the current scope if the declaration
2086 * is a redeclaration, \c NULL otherwise.
2089 get_variable_being_redeclared(ir_variable
*var
, ast_declaration
*decl
,
2090 struct _mesa_glsl_parse_state
*state
)
2092 /* Check if this declaration is actually a re-declaration, either to
2093 * resize an array or add qualifiers to an existing variable.
2095 * This is allowed for variables in the current scope, or when at
2096 * global scope (for built-ins in the implicit outer scope).
2098 ir_variable
*earlier
= state
->symbols
->get_variable(decl
->identifier
);
2099 if (earlier
== NULL
||
2100 (state
->current_function
!= NULL
&&
2101 !state
->symbols
->name_declared_this_scope(decl
->identifier
))) {
2106 YYLTYPE loc
= decl
->get_location();
2108 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec,
2110 * "It is legal to declare an array without a size and then
2111 * later re-declare the same name as an array of the same
2112 * type and specify a size."
2114 if ((earlier
->type
->array_size() == 0)
2115 && var
->type
->is_array()
2116 && (var
->type
->element_type() == earlier
->type
->element_type())) {
2117 /* FINISHME: This doesn't match the qualifiers on the two
2118 * FINISHME: declarations. It's not 100% clear whether this is
2119 * FINISHME: required or not.
2122 /* From page 54 (page 60 of the PDF) of the GLSL 1.20 spec:
2124 * "The size [of gl_TexCoord] can be at most
2125 * gl_MaxTextureCoords."
2127 const unsigned size
= unsigned(var
->type
->array_size());
2128 if ((strcmp("gl_TexCoord", var
->name
) == 0)
2129 && (size
> state
->Const
.MaxTextureCoords
)) {
2130 _mesa_glsl_error(& loc
, state
, "`gl_TexCoord' array size cannot "
2131 "be larger than gl_MaxTextureCoords (%u)\n",
2132 state
->Const
.MaxTextureCoords
);
2133 } else if ((size
> 0) && (size
<= earlier
->max_array_access
)) {
2134 _mesa_glsl_error(& loc
, state
, "array size must be > %u due to "
2136 earlier
->max_array_access
);
2139 earlier
->type
= var
->type
;
2142 } else if (state
->ARB_fragment_coord_conventions_enable
2143 && strcmp(var
->name
, "gl_FragCoord") == 0
2144 && earlier
->type
== var
->type
2145 && earlier
->mode
== var
->mode
) {
2146 /* Allow redeclaration of gl_FragCoord for ARB_fcc layout
2149 earlier
->origin_upper_left
= var
->origin_upper_left
;
2150 earlier
->pixel_center_integer
= var
->pixel_center_integer
;
2152 /* According to section 4.3.7 of the GLSL 1.30 spec,
2153 * the following built-in varaibles can be redeclared with an
2154 * interpolation qualifier:
2157 * * gl_FrontSecondaryColor
2158 * * gl_BackSecondaryColor
2160 * * gl_SecondaryColor
2162 } else if (state
->language_version
>= 130
2163 && (strcmp(var
->name
, "gl_FrontColor") == 0
2164 || strcmp(var
->name
, "gl_BackColor") == 0
2165 || strcmp(var
->name
, "gl_FrontSecondaryColor") == 0
2166 || strcmp(var
->name
, "gl_BackSecondaryColor") == 0
2167 || strcmp(var
->name
, "gl_Color") == 0
2168 || strcmp(var
->name
, "gl_SecondaryColor") == 0)
2169 && earlier
->type
== var
->type
2170 && earlier
->mode
== var
->mode
) {
2171 earlier
->interpolation
= var
->interpolation
;
2173 /* Layout qualifiers for gl_FragDepth. */
2174 } else if (state
->AMD_conservative_depth_enable
2175 && strcmp(var
->name
, "gl_FragDepth") == 0
2176 && earlier
->type
== var
->type
2177 && earlier
->mode
== var
->mode
) {
2179 /** From the AMD_conservative_depth spec:
2180 * Within any shader, the first redeclarations of gl_FragDepth
2181 * must appear before any use of gl_FragDepth.
2183 if (earlier
->used
) {
2184 _mesa_glsl_error(&loc
, state
,
2185 "the first redeclaration of gl_FragDepth "
2186 "must appear before any use of gl_FragDepth");
2189 /* Prevent inconsistent redeclaration of depth layout qualifier. */
2190 if (earlier
->depth_layout
!= ir_depth_layout_none
2191 && earlier
->depth_layout
!= var
->depth_layout
) {
2192 _mesa_glsl_error(&loc
, state
,
2193 "gl_FragDepth: depth layout is declared here "
2194 "as '%s, but it was previously declared as "
2196 depth_layout_string(var
->depth_layout
),
2197 depth_layout_string(earlier
->depth_layout
));
2200 earlier
->depth_layout
= var
->depth_layout
;
2203 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", decl
->identifier
);
2210 * Generate the IR for an initializer in a variable declaration
2213 process_initializer(ir_variable
*var
, ast_declaration
*decl
,
2214 ast_fully_specified_type
*type
,
2215 exec_list
*initializer_instructions
,
2216 struct _mesa_glsl_parse_state
*state
)
2218 ir_rvalue
*result
= NULL
;
2220 YYLTYPE initializer_loc
= decl
->initializer
->get_location();
2222 /* From page 24 (page 30 of the PDF) of the GLSL 1.10 spec:
2224 * "All uniform variables are read-only and are initialized either
2225 * directly by an application via API commands, or indirectly by
2228 if ((state
->language_version
<= 110)
2229 && (var
->mode
== ir_var_uniform
)) {
2230 _mesa_glsl_error(& initializer_loc
, state
,
2231 "cannot initialize uniforms in GLSL 1.10");
2234 if (var
->type
->is_sampler()) {
2235 _mesa_glsl_error(& initializer_loc
, state
,
2236 "cannot initialize samplers");
2239 if ((var
->mode
== ir_var_in
) && (state
->current_function
== NULL
)) {
2240 _mesa_glsl_error(& initializer_loc
, state
,
2241 "cannot initialize %s shader input / %s",
2242 _mesa_glsl_shader_target_name(state
->target
),
2243 (state
->target
== vertex_shader
)
2244 ? "attribute" : "varying");
2247 ir_dereference
*const lhs
= new(state
) ir_dereference_variable(var
);
2248 ir_rvalue
*rhs
= decl
->initializer
->hir(initializer_instructions
,
2251 /* Calculate the constant value if this is a const or uniform
2254 if (type
->qualifier
.flags
.q
.constant
2255 || type
->qualifier
.flags
.q
.uniform
) {
2256 ir_rvalue
*new_rhs
= validate_assignment(state
, var
->type
, rhs
, true);
2257 if (new_rhs
!= NULL
) {
2260 ir_constant
*constant_value
= rhs
->constant_expression_value();
2261 if (!constant_value
) {
2262 _mesa_glsl_error(& initializer_loc
, state
,
2263 "initializer of %s variable `%s' must be a "
2264 "constant expression",
2265 (type
->qualifier
.flags
.q
.constant
)
2266 ? "const" : "uniform",
2268 if (var
->type
->is_numeric()) {
2269 /* Reduce cascading errors. */
2270 var
->constant_value
= ir_constant::zero(state
, var
->type
);
2273 rhs
= constant_value
;
2274 var
->constant_value
= constant_value
;
2277 _mesa_glsl_error(&initializer_loc
, state
,
2278 "initializer of type %s cannot be assigned to "
2279 "variable of type %s",
2280 rhs
->type
->name
, var
->type
->name
);
2281 if (var
->type
->is_numeric()) {
2282 /* Reduce cascading errors. */
2283 var
->constant_value
= ir_constant::zero(state
, var
->type
);
2288 if (rhs
&& !rhs
->type
->is_error()) {
2289 bool temp
= var
->read_only
;
2290 if (type
->qualifier
.flags
.q
.constant
)
2291 var
->read_only
= false;
2293 /* Never emit code to initialize a uniform.
2295 const glsl_type
*initializer_type
;
2296 if (!type
->qualifier
.flags
.q
.uniform
) {
2297 result
= do_assignment(initializer_instructions
, state
,
2299 type
->get_location());
2300 initializer_type
= result
->type
;
2302 initializer_type
= rhs
->type
;
2304 /* If the declared variable is an unsized array, it must inherrit
2305 * its full type from the initializer. A declaration such as
2307 * uniform float a[] = float[](1.0, 2.0, 3.0, 3.0);
2311 * uniform float a[4] = float[](1.0, 2.0, 3.0, 3.0);
2313 * The assignment generated in the if-statement (below) will also
2314 * automatically handle this case for non-uniforms.
2316 * If the declared variable is not an array, the types must
2317 * already match exactly. As a result, the type assignment
2318 * here can be done unconditionally. For non-uniforms the call
2319 * to do_assignment can change the type of the initializer (via
2320 * the implicit conversion rules). For uniforms the initializer
2321 * must be a constant expression, and the type of that expression
2322 * was validated above.
2324 var
->type
= initializer_type
;
2326 var
->read_only
= temp
;
2333 ast_declarator_list::hir(exec_list
*instructions
,
2334 struct _mesa_glsl_parse_state
*state
)
2337 const struct glsl_type
*decl_type
;
2338 const char *type_name
= NULL
;
2339 ir_rvalue
*result
= NULL
;
2340 YYLTYPE loc
= this->get_location();
2342 /* From page 46 (page 52 of the PDF) of the GLSL 1.50 spec:
2344 * "To ensure that a particular output variable is invariant, it is
2345 * necessary to use the invariant qualifier. It can either be used to
2346 * qualify a previously declared variable as being invariant
2348 * invariant gl_Position; // make existing gl_Position be invariant"
2350 * In these cases the parser will set the 'invariant' flag in the declarator
2351 * list, and the type will be NULL.
2353 if (this->invariant
) {
2354 assert(this->type
== NULL
);
2356 if (state
->current_function
!= NULL
) {
2357 _mesa_glsl_error(& loc
, state
,
2358 "All uses of `invariant' keyword must be at global "
2362 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
2363 assert(!decl
->is_array
);
2364 assert(decl
->array_size
== NULL
);
2365 assert(decl
->initializer
== NULL
);
2367 ir_variable
*const earlier
=
2368 state
->symbols
->get_variable(decl
->identifier
);
2369 if (earlier
== NULL
) {
2370 _mesa_glsl_error(& loc
, state
,
2371 "Undeclared variable `%s' cannot be marked "
2372 "invariant\n", decl
->identifier
);
2373 } else if ((state
->target
== vertex_shader
)
2374 && (earlier
->mode
!= ir_var_out
)) {
2375 _mesa_glsl_error(& loc
, state
,
2376 "`%s' cannot be marked invariant, vertex shader "
2377 "outputs only\n", decl
->identifier
);
2378 } else if ((state
->target
== fragment_shader
)
2379 && (earlier
->mode
!= ir_var_in
)) {
2380 _mesa_glsl_error(& loc
, state
,
2381 "`%s' cannot be marked invariant, fragment shader "
2382 "inputs only\n", decl
->identifier
);
2383 } else if (earlier
->used
) {
2384 _mesa_glsl_error(& loc
, state
,
2385 "variable `%s' may not be redeclared "
2386 "`invariant' after being used",
2389 earlier
->invariant
= true;
2393 /* Invariant redeclarations do not have r-values.
2398 assert(this->type
!= NULL
);
2399 assert(!this->invariant
);
2401 /* The type specifier may contain a structure definition. Process that
2402 * before any of the variable declarations.
2404 (void) this->type
->specifier
->hir(instructions
, state
);
2406 decl_type
= this->type
->specifier
->glsl_type(& type_name
, state
);
2407 if (this->declarations
.is_empty()) {
2408 /* The only valid case where the declaration list can be empty is when
2409 * the declaration is setting the default precision of a built-in type
2410 * (e.g., 'precision highp vec4;').
2413 if (decl_type
!= NULL
) {
2415 _mesa_glsl_error(& loc
, state
, "incomplete declaration");
2419 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
2420 const struct glsl_type
*var_type
;
2423 /* FINISHME: Emit a warning if a variable declaration shadows a
2424 * FINISHME: declaration at a higher scope.
2427 if ((decl_type
== NULL
) || decl_type
->is_void()) {
2428 if (type_name
!= NULL
) {
2429 _mesa_glsl_error(& loc
, state
,
2430 "invalid type `%s' in declaration of `%s'",
2431 type_name
, decl
->identifier
);
2433 _mesa_glsl_error(& loc
, state
,
2434 "invalid type in declaration of `%s'",
2440 if (decl
->is_array
) {
2441 var_type
= process_array_type(&loc
, decl_type
, decl
->array_size
,
2444 var_type
= decl_type
;
2447 var
= new(ctx
) ir_variable(var_type
, decl
->identifier
, ir_var_auto
);
2449 /* From page 22 (page 28 of the PDF) of the GLSL 1.10 specification;
2451 * "Global variables can only use the qualifiers const,
2452 * attribute, uni form, or varying. Only one may be
2455 * Local variables can only use the qualifier const."
2457 * This is relaxed in GLSL 1.30. It is also relaxed by any extension
2458 * that adds the 'layout' keyword.
2460 if ((state
->language_version
< 130)
2461 && !state
->ARB_explicit_attrib_location_enable
2462 && !state
->ARB_fragment_coord_conventions_enable
) {
2463 if (this->type
->qualifier
.flags
.q
.out
) {
2464 _mesa_glsl_error(& loc
, state
,
2465 "`out' qualifier in declaration of `%s' "
2466 "only valid for function parameters in %s.",
2467 decl
->identifier
, state
->version_string
);
2469 if (this->type
->qualifier
.flags
.q
.in
) {
2470 _mesa_glsl_error(& loc
, state
,
2471 "`in' qualifier in declaration of `%s' "
2472 "only valid for function parameters in %s.",
2473 decl
->identifier
, state
->version_string
);
2475 /* FINISHME: Test for other invalid qualifiers. */
2478 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
,
2481 if (this->type
->qualifier
.flags
.q
.invariant
) {
2482 if ((state
->target
== vertex_shader
) && !(var
->mode
== ir_var_out
||
2483 var
->mode
== ir_var_inout
)) {
2484 /* FINISHME: Note that this doesn't work for invariant on
2485 * a function signature outval
2487 _mesa_glsl_error(& loc
, state
,
2488 "`%s' cannot be marked invariant, vertex shader "
2489 "outputs only\n", var
->name
);
2490 } else if ((state
->target
== fragment_shader
) &&
2491 !(var
->mode
== ir_var_in
|| var
->mode
== ir_var_inout
)) {
2492 /* FINISHME: Note that this doesn't work for invariant on
2493 * a function signature inval
2495 _mesa_glsl_error(& loc
, state
,
2496 "`%s' cannot be marked invariant, fragment shader "
2497 "inputs only\n", var
->name
);
2501 if (state
->current_function
!= NULL
) {
2502 const char *mode
= NULL
;
2503 const char *extra
= "";
2505 /* There is no need to check for 'inout' here because the parser will
2506 * only allow that in function parameter lists.
2508 if (this->type
->qualifier
.flags
.q
.attribute
) {
2510 } else if (this->type
->qualifier
.flags
.q
.uniform
) {
2512 } else if (this->type
->qualifier
.flags
.q
.varying
) {
2514 } else if (this->type
->qualifier
.flags
.q
.in
) {
2516 extra
= " or in function parameter list";
2517 } else if (this->type
->qualifier
.flags
.q
.out
) {
2519 extra
= " or in function parameter list";
2523 _mesa_glsl_error(& loc
, state
,
2524 "%s variable `%s' must be declared at "
2526 mode
, var
->name
, extra
);
2528 } else if (var
->mode
== ir_var_in
) {
2529 var
->read_only
= true;
2531 if (state
->target
== vertex_shader
) {
2532 bool error_emitted
= false;
2534 /* From page 31 (page 37 of the PDF) of the GLSL 1.50 spec:
2536 * "Vertex shader inputs can only be float, floating-point
2537 * vectors, matrices, signed and unsigned integers and integer
2538 * vectors. Vertex shader inputs can also form arrays of these
2539 * types, but not structures."
2541 * From page 31 (page 27 of the PDF) of the GLSL 1.30 spec:
2543 * "Vertex shader inputs can only be float, floating-point
2544 * vectors, matrices, signed and unsigned integers and integer
2545 * vectors. They cannot be arrays or structures."
2547 * From page 23 (page 29 of the PDF) of the GLSL 1.20 spec:
2549 * "The attribute qualifier can be used only with float,
2550 * floating-point vectors, and matrices. Attribute variables
2551 * cannot be declared as arrays or structures."
2553 const glsl_type
*check_type
= var
->type
->is_array()
2554 ? var
->type
->fields
.array
: var
->type
;
2556 switch (check_type
->base_type
) {
2557 case GLSL_TYPE_FLOAT
:
2559 case GLSL_TYPE_UINT
:
2561 if (state
->language_version
> 120)
2565 _mesa_glsl_error(& loc
, state
,
2566 "vertex shader input / attribute cannot have "
2568 var
->type
->is_array() ? "array of " : "",
2570 error_emitted
= true;
2573 if (!error_emitted
&& (state
->language_version
<= 130)
2574 && var
->type
->is_array()) {
2575 _mesa_glsl_error(& loc
, state
,
2576 "vertex shader input / attribute cannot have "
2578 error_emitted
= true;
2583 /* Integer vertex outputs must be qualified with 'flat'.
2585 * From section 4.3.6 of the GLSL 1.30 spec:
2586 * "If a vertex output is a signed or unsigned integer or integer
2587 * vector, then it must be qualified with the interpolation qualifier
2590 if (state
->language_version
>= 130
2591 && state
->target
== vertex_shader
2592 && state
->current_function
== NULL
2593 && var
->type
->is_integer()
2594 && var
->mode
== ir_var_out
2595 && var
->interpolation
!= ir_var_flat
) {
2597 _mesa_glsl_error(&loc
, state
, "If a vertex output is an integer, "
2598 "then it must be qualified with 'flat'");
2602 /* Interpolation qualifiers cannot be applied to 'centroid' and
2603 * 'centroid varying'.
2605 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
2606 * "interpolation qualifiers may only precede the qualifiers in,
2607 * centroid in, out, or centroid out in a declaration. They do not apply
2608 * to the deprecated storage qualifiers varying or centroid varying."
2610 if (state
->language_version
>= 130
2611 && this->type
->qualifier
.has_interpolation()
2612 && this->type
->qualifier
.flags
.q
.varying
) {
2614 const char *i
= this->type
->qualifier
.interpolation_string();
2617 if (this->type
->qualifier
.flags
.q
.centroid
)
2618 s
= "centroid varying";
2622 _mesa_glsl_error(&loc
, state
,
2623 "qualifier '%s' cannot be applied to the "
2624 "deprecated storage qualifier '%s'", i
, s
);
2628 /* Interpolation qualifiers can only apply to vertex shader outputs and
2629 * fragment shader inputs.
2631 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
2632 * "Outputs from a vertex shader (out) and inputs to a fragment
2633 * shader (in) can be further qualified with one or more of these
2634 * interpolation qualifiers"
2636 if (state
->language_version
>= 130
2637 && this->type
->qualifier
.has_interpolation()) {
2639 const char *i
= this->type
->qualifier
.interpolation_string();
2642 switch (state
->target
) {
2644 if (this->type
->qualifier
.flags
.q
.in
) {
2645 _mesa_glsl_error(&loc
, state
,
2646 "qualifier '%s' cannot be applied to vertex "
2647 "shader inputs", i
);
2650 case fragment_shader
:
2651 if (this->type
->qualifier
.flags
.q
.out
) {
2652 _mesa_glsl_error(&loc
, state
,
2653 "qualifier '%s' cannot be applied to fragment "
2654 "shader outputs", i
);
2663 /* From section 4.3.4 of the GLSL 1.30 spec:
2664 * "It is an error to use centroid in in a vertex shader."
2666 if (state
->language_version
>= 130
2667 && this->type
->qualifier
.flags
.q
.centroid
2668 && this->type
->qualifier
.flags
.q
.in
2669 && state
->target
== vertex_shader
) {
2671 _mesa_glsl_error(&loc
, state
,
2672 "'centroid in' cannot be used in a vertex shader");
2676 /* Precision qualifiers exists only in GLSL versions 1.00 and >= 1.30.
2678 if (this->type
->specifier
->precision
!= ast_precision_none
2679 && state
->language_version
!= 100
2680 && state
->language_version
< 130) {
2682 _mesa_glsl_error(&loc
, state
,
2683 "precision qualifiers are supported only in GLSL ES "
2684 "1.00, and GLSL 1.30 and later");
2688 /* Precision qualifiers only apply to floating point and integer types.
2690 * From section 4.5.2 of the GLSL 1.30 spec:
2691 * "Any floating point or any integer declaration can have the type
2692 * preceded by one of these precision qualifiers [...] Literal
2693 * constants do not have precision qualifiers. Neither do Boolean
2696 * In GLSL ES, sampler types are also allowed.
2698 * From page 87 of the GLSL ES spec:
2699 * "RESOLUTION: Allow sampler types to take a precision qualifier."
2701 if (this->type
->specifier
->precision
!= ast_precision_none
2702 && !var
->type
->is_float()
2703 && !var
->type
->is_integer()
2704 && !(var
->type
->is_sampler() && state
->es_shader
)
2705 && !(var
->type
->is_array()
2706 && (var
->type
->fields
.array
->is_float()
2707 || var
->type
->fields
.array
->is_integer()))) {
2709 _mesa_glsl_error(&loc
, state
,
2710 "precision qualifiers apply only to floating point"
2711 "%s types", state
->es_shader
? ", integer, and sampler"
2715 /* Process the initializer and add its instructions to a temporary
2716 * list. This list will be added to the instruction stream (below) after
2717 * the declaration is added. This is done because in some cases (such as
2718 * redeclarations) the declaration may not actually be added to the
2719 * instruction stream.
2721 exec_list initializer_instructions
;
2722 ir_variable
*earlier
= get_variable_being_redeclared(var
, decl
, state
);
2724 if (decl
->initializer
!= NULL
) {
2725 result
= process_initializer((earlier
== NULL
) ? var
: earlier
,
2727 &initializer_instructions
, state
);
2730 /* From page 23 (page 29 of the PDF) of the GLSL 1.10 spec:
2732 * "It is an error to write to a const variable outside of
2733 * its declaration, so they must be initialized when
2736 if (this->type
->qualifier
.flags
.q
.constant
&& decl
->initializer
== NULL
) {
2737 _mesa_glsl_error(& loc
, state
,
2738 "const declaration of `%s' must be initialized",
2742 /* If the declaration is not a redeclaration, there are a few additional
2743 * semantic checks that must be applied. In addition, variable that was
2744 * created for the declaration should be added to the IR stream.
2746 if (earlier
== NULL
) {
2747 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
2749 * "Identifiers starting with "gl_" are reserved for use by
2750 * OpenGL, and may not be declared in a shader as either a
2751 * variable or a function."
2753 if (strncmp(decl
->identifier
, "gl_", 3) == 0)
2754 _mesa_glsl_error(& loc
, state
,
2755 "identifier `%s' uses reserved `gl_' prefix",
2758 /* Add the variable to the symbol table. Note that the initializer's
2759 * IR was already processed earlier (though it hasn't been emitted
2760 * yet), without the variable in scope.
2762 * This differs from most C-like languages, but it follows the GLSL
2763 * specification. From page 28 (page 34 of the PDF) of the GLSL 1.50
2766 * "Within a declaration, the scope of a name starts immediately
2767 * after the initializer if present or immediately after the name
2768 * being declared if not."
2770 if (!state
->symbols
->add_variable(var
)) {
2771 YYLTYPE loc
= this->get_location();
2772 _mesa_glsl_error(&loc
, state
, "name `%s' already taken in the "
2773 "current scope", decl
->identifier
);
2777 /* Push the variable declaration to the top. It means that all the
2778 * variable declarations will appear in a funny last-to-first order,
2779 * but otherwise we run into trouble if a function is prototyped, a
2780 * global var is decled, then the function is defined with usage of
2781 * the global var. See glslparsertest's CorrectModule.frag.
2783 instructions
->push_head(var
);
2786 instructions
->append_list(&initializer_instructions
);
2790 /* Generally, variable declarations do not have r-values. However,
2791 * one is used for the declaration in
2793 * while (bool b = some_condition()) {
2797 * so we return the rvalue from the last seen declaration here.
2804 ast_parameter_declarator::hir(exec_list
*instructions
,
2805 struct _mesa_glsl_parse_state
*state
)
2808 const struct glsl_type
*type
;
2809 const char *name
= NULL
;
2810 YYLTYPE loc
= this->get_location();
2812 type
= this->type
->specifier
->glsl_type(& name
, state
);
2816 _mesa_glsl_error(& loc
, state
,
2817 "invalid type `%s' in declaration of `%s'",
2818 name
, this->identifier
);
2820 _mesa_glsl_error(& loc
, state
,
2821 "invalid type in declaration of `%s'",
2825 type
= glsl_type::error_type
;
2828 /* From page 62 (page 68 of the PDF) of the GLSL 1.50 spec:
2830 * "Functions that accept no input arguments need not use void in the
2831 * argument list because prototypes (or definitions) are required and
2832 * therefore there is no ambiguity when an empty argument list "( )" is
2833 * declared. The idiom "(void)" as a parameter list is provided for
2836 * Placing this check here prevents a void parameter being set up
2837 * for a function, which avoids tripping up checks for main taking
2838 * parameters and lookups of an unnamed symbol.
2840 if (type
->is_void()) {
2841 if (this->identifier
!= NULL
)
2842 _mesa_glsl_error(& loc
, state
,
2843 "named parameter cannot have type `void'");
2849 if (formal_parameter
&& (this->identifier
== NULL
)) {
2850 _mesa_glsl_error(& loc
, state
, "formal parameter lacks a name");
2854 /* This only handles "vec4 foo[..]". The earlier specifier->glsl_type(...)
2855 * call already handled the "vec4[..] foo" case.
2857 if (this->is_array
) {
2858 type
= process_array_type(&loc
, type
, this->array_size
, state
);
2861 if (type
->array_size() == 0) {
2862 _mesa_glsl_error(&loc
, state
, "arrays passed as parameters must have "
2863 "a declared size.");
2864 type
= glsl_type::error_type
;
2868 ir_variable
*var
= new(ctx
) ir_variable(type
, this->identifier
, ir_var_in
);
2870 /* Apply any specified qualifiers to the parameter declaration. Note that
2871 * for function parameters the default mode is 'in'.
2873 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
, & loc
);
2875 instructions
->push_tail(var
);
2877 /* Parameter declarations do not have r-values.
2884 ast_parameter_declarator::parameters_to_hir(exec_list
*ast_parameters
,
2886 exec_list
*ir_parameters
,
2887 _mesa_glsl_parse_state
*state
)
2889 ast_parameter_declarator
*void_param
= NULL
;
2892 foreach_list_typed (ast_parameter_declarator
, param
, link
, ast_parameters
) {
2893 param
->formal_parameter
= formal
;
2894 param
->hir(ir_parameters
, state
);
2902 if ((void_param
!= NULL
) && (count
> 1)) {
2903 YYLTYPE loc
= void_param
->get_location();
2905 _mesa_glsl_error(& loc
, state
,
2906 "`void' parameter must be only parameter");
2912 emit_function(_mesa_glsl_parse_state
*state
, exec_list
*instructions
,
2915 /* Emit the new function header */
2916 if (state
->current_function
== NULL
) {
2917 instructions
->push_tail(f
);
2919 /* IR invariants disallow function declarations or definitions nested
2920 * within other function definitions. Insert the new ir_function
2921 * block in the instruction sequence before the ir_function block
2922 * containing the current ir_function_signature.
2924 ir_function
*const curr
=
2925 const_cast<ir_function
*>(state
->current_function
->function());
2927 curr
->insert_before(f
);
2933 ast_function::hir(exec_list
*instructions
,
2934 struct _mesa_glsl_parse_state
*state
)
2937 ir_function
*f
= NULL
;
2938 ir_function_signature
*sig
= NULL
;
2939 exec_list hir_parameters
;
2941 const char *const name
= identifier
;
2943 /* From page 21 (page 27 of the PDF) of the GLSL 1.20 spec,
2945 * "Function declarations (prototypes) cannot occur inside of functions;
2946 * they must be at global scope, or for the built-in functions, outside
2947 * the global scope."
2949 * From page 27 (page 33 of the PDF) of the GLSL ES 1.00.16 spec,
2951 * "User defined functions may only be defined within the global scope."
2953 * Note that this language does not appear in GLSL 1.10.
2955 if ((state
->current_function
!= NULL
) && (state
->language_version
!= 110)) {
2956 YYLTYPE loc
= this->get_location();
2957 _mesa_glsl_error(&loc
, state
,
2958 "declaration of function `%s' not allowed within "
2959 "function body", name
);
2962 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
2964 * "Identifiers starting with "gl_" are reserved for use by
2965 * OpenGL, and may not be declared in a shader as either a
2966 * variable or a function."
2968 if (strncmp(name
, "gl_", 3) == 0) {
2969 YYLTYPE loc
= this->get_location();
2970 _mesa_glsl_error(&loc
, state
,
2971 "identifier `%s' uses reserved `gl_' prefix", name
);
2974 /* Convert the list of function parameters to HIR now so that they can be
2975 * used below to compare this function's signature with previously seen
2976 * signatures for functions with the same name.
2978 ast_parameter_declarator::parameters_to_hir(& this->parameters
,
2980 & hir_parameters
, state
);
2982 const char *return_type_name
;
2983 const glsl_type
*return_type
=
2984 this->return_type
->specifier
->glsl_type(& return_type_name
, state
);
2987 YYLTYPE loc
= this->get_location();
2988 _mesa_glsl_error(&loc
, state
,
2989 "function `%s' has undeclared return type `%s'",
2990 name
, return_type_name
);
2991 return_type
= glsl_type::error_type
;
2994 /* From page 56 (page 62 of the PDF) of the GLSL 1.30 spec:
2995 * "No qualifier is allowed on the return type of a function."
2997 if (this->return_type
->has_qualifiers()) {
2998 YYLTYPE loc
= this->get_location();
2999 _mesa_glsl_error(& loc
, state
,
3000 "function `%s' return type has qualifiers", name
);
3003 /* Verify that this function's signature either doesn't match a previously
3004 * seen signature for a function with the same name, or, if a match is found,
3005 * that the previously seen signature does not have an associated definition.
3007 f
= state
->symbols
->get_function(name
);
3008 if (f
!= NULL
&& (state
->es_shader
|| f
->has_user_signature())) {
3009 sig
= f
->exact_matching_signature(&hir_parameters
);
3011 const char *badvar
= sig
->qualifiers_match(&hir_parameters
);
3012 if (badvar
!= NULL
) {
3013 YYLTYPE loc
= this->get_location();
3015 _mesa_glsl_error(&loc
, state
, "function `%s' parameter `%s' "
3016 "qualifiers don't match prototype", name
, badvar
);
3019 if (sig
->return_type
!= return_type
) {
3020 YYLTYPE loc
= this->get_location();
3022 _mesa_glsl_error(&loc
, state
, "function `%s' return type doesn't "
3023 "match prototype", name
);
3026 if (is_definition
&& sig
->is_defined
) {
3027 YYLTYPE loc
= this->get_location();
3029 _mesa_glsl_error(& loc
, state
, "function `%s' redefined", name
);
3033 f
= new(ctx
) ir_function(name
);
3034 if (!state
->symbols
->add_function(f
)) {
3035 /* This function name shadows a non-function use of the same name. */
3036 YYLTYPE loc
= this->get_location();
3038 _mesa_glsl_error(&loc
, state
, "function name `%s' conflicts with "
3039 "non-function", name
);
3043 emit_function(state
, instructions
, f
);
3046 /* Verify the return type of main() */
3047 if (strcmp(name
, "main") == 0) {
3048 if (! return_type
->is_void()) {
3049 YYLTYPE loc
= this->get_location();
3051 _mesa_glsl_error(& loc
, state
, "main() must return void");
3054 if (!hir_parameters
.is_empty()) {
3055 YYLTYPE loc
= this->get_location();
3057 _mesa_glsl_error(& loc
, state
, "main() must not take any parameters");
3061 /* Finish storing the information about this new function in its signature.
3064 sig
= new(ctx
) ir_function_signature(return_type
);
3065 f
->add_signature(sig
);
3068 sig
->replace_parameters(&hir_parameters
);
3071 /* Function declarations (prototypes) do not have r-values.
3078 ast_function_definition::hir(exec_list
*instructions
,
3079 struct _mesa_glsl_parse_state
*state
)
3081 prototype
->is_definition
= true;
3082 prototype
->hir(instructions
, state
);
3084 ir_function_signature
*signature
= prototype
->signature
;
3085 if (signature
== NULL
)
3088 assert(state
->current_function
== NULL
);
3089 state
->current_function
= signature
;
3090 state
->found_return
= false;
3092 /* Duplicate parameters declared in the prototype as concrete variables.
3093 * Add these to the symbol table.
3095 state
->symbols
->push_scope();
3096 foreach_iter(exec_list_iterator
, iter
, signature
->parameters
) {
3097 ir_variable
*const var
= ((ir_instruction
*) iter
.get())->as_variable();
3099 assert(var
!= NULL
);
3101 /* The only way a parameter would "exist" is if two parameters have
3104 if (state
->symbols
->name_declared_this_scope(var
->name
)) {
3105 YYLTYPE loc
= this->get_location();
3107 _mesa_glsl_error(& loc
, state
, "parameter `%s' redeclared", var
->name
);
3109 state
->symbols
->add_variable(var
);
3113 /* Convert the body of the function to HIR. */
3114 this->body
->hir(&signature
->body
, state
);
3115 signature
->is_defined
= true;
3117 state
->symbols
->pop_scope();
3119 assert(state
->current_function
== signature
);
3120 state
->current_function
= NULL
;
3122 if (!signature
->return_type
->is_void() && !state
->found_return
) {
3123 YYLTYPE loc
= this->get_location();
3124 _mesa_glsl_error(& loc
, state
, "function `%s' has non-void return type "
3125 "%s, but no return statement",
3126 signature
->function_name(),
3127 signature
->return_type
->name
);
3130 /* Function definitions do not have r-values.
3137 ast_jump_statement::hir(exec_list
*instructions
,
3138 struct _mesa_glsl_parse_state
*state
)
3145 assert(state
->current_function
);
3147 if (opt_return_value
) {
3148 ir_rvalue
*const ret
= opt_return_value
->hir(instructions
, state
);
3150 /* The value of the return type can be NULL if the shader says
3151 * 'return foo();' and foo() is a function that returns void.
3153 * NOTE: The GLSL spec doesn't say that this is an error. The type
3154 * of the return value is void. If the return type of the function is
3155 * also void, then this should compile without error. Seriously.
3157 const glsl_type
*const ret_type
=
3158 (ret
== NULL
) ? glsl_type::void_type
: ret
->type
;
3160 /* Implicit conversions are not allowed for return values. */
3161 if (state
->current_function
->return_type
!= ret_type
) {
3162 YYLTYPE loc
= this->get_location();
3164 _mesa_glsl_error(& loc
, state
,
3165 "`return' with wrong type %s, in function `%s' "
3168 state
->current_function
->function_name(),
3169 state
->current_function
->return_type
->name
);
3172 inst
= new(ctx
) ir_return(ret
);
3174 if (state
->current_function
->return_type
->base_type
!=
3176 YYLTYPE loc
= this->get_location();
3178 _mesa_glsl_error(& loc
, state
,
3179 "`return' with no value, in function %s returning "
3181 state
->current_function
->function_name());
3183 inst
= new(ctx
) ir_return
;
3186 state
->found_return
= true;
3187 instructions
->push_tail(inst
);
3192 if (state
->target
!= fragment_shader
) {
3193 YYLTYPE loc
= this->get_location();
3195 _mesa_glsl_error(& loc
, state
,
3196 "`discard' may only appear in a fragment shader");
3198 instructions
->push_tail(new(ctx
) ir_discard
);
3203 /* FINISHME: Handle switch-statements. They cannot contain 'continue',
3204 * FINISHME: and they use a different IR instruction for 'break'.
3206 /* FINISHME: Correctly handle the nesting. If a switch-statement is
3207 * FINISHME: inside a loop, a 'continue' is valid and will bind to the
3210 if (state
->loop_or_switch_nesting
== NULL
) {
3211 YYLTYPE loc
= this->get_location();
3213 _mesa_glsl_error(& loc
, state
,
3214 "`%s' may only appear in a loop",
3215 (mode
== ast_break
) ? "break" : "continue");
3217 ir_loop
*const loop
= state
->loop_or_switch_nesting
->as_loop();
3219 /* Inline the for loop expression again, since we don't know
3220 * where near the end of the loop body the normal copy of it
3221 * is going to be placed.
3223 if (mode
== ast_continue
&&
3224 state
->loop_or_switch_nesting_ast
->rest_expression
) {
3225 state
->loop_or_switch_nesting_ast
->rest_expression
->hir(instructions
,
3230 ir_loop_jump
*const jump
=
3231 new(ctx
) ir_loop_jump((mode
== ast_break
)
3232 ? ir_loop_jump::jump_break
3233 : ir_loop_jump::jump_continue
);
3234 instructions
->push_tail(jump
);
3241 /* Jump instructions do not have r-values.
3248 ast_selection_statement::hir(exec_list
*instructions
,
3249 struct _mesa_glsl_parse_state
*state
)
3253 ir_rvalue
*const condition
= this->condition
->hir(instructions
, state
);
3255 /* From page 66 (page 72 of the PDF) of the GLSL 1.50 spec:
3257 * "Any expression whose type evaluates to a Boolean can be used as the
3258 * conditional expression bool-expression. Vector types are not accepted
3259 * as the expression to if."
3261 * The checks are separated so that higher quality diagnostics can be
3262 * generated for cases where both rules are violated.
3264 if (!condition
->type
->is_boolean() || !condition
->type
->is_scalar()) {
3265 YYLTYPE loc
= this->condition
->get_location();
3267 _mesa_glsl_error(& loc
, state
, "if-statement condition must be scalar "
3271 ir_if
*const stmt
= new(ctx
) ir_if(condition
);
3273 if (then_statement
!= NULL
) {
3274 state
->symbols
->push_scope();
3275 then_statement
->hir(& stmt
->then_instructions
, state
);
3276 state
->symbols
->pop_scope();
3279 if (else_statement
!= NULL
) {
3280 state
->symbols
->push_scope();
3281 else_statement
->hir(& stmt
->else_instructions
, state
);
3282 state
->symbols
->pop_scope();
3285 instructions
->push_tail(stmt
);
3287 /* if-statements do not have r-values.
3294 ast_iteration_statement::condition_to_hir(ir_loop
*stmt
,
3295 struct _mesa_glsl_parse_state
*state
)
3299 if (condition
!= NULL
) {
3300 ir_rvalue
*const cond
=
3301 condition
->hir(& stmt
->body_instructions
, state
);
3304 || !cond
->type
->is_boolean() || !cond
->type
->is_scalar()) {
3305 YYLTYPE loc
= condition
->get_location();
3307 _mesa_glsl_error(& loc
, state
,
3308 "loop condition must be scalar boolean");
3310 /* As the first code in the loop body, generate a block that looks
3311 * like 'if (!condition) break;' as the loop termination condition.
3313 ir_rvalue
*const not_cond
=
3314 new(ctx
) ir_expression(ir_unop_logic_not
, glsl_type::bool_type
, cond
,
3317 ir_if
*const if_stmt
= new(ctx
) ir_if(not_cond
);
3319 ir_jump
*const break_stmt
=
3320 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
3322 if_stmt
->then_instructions
.push_tail(break_stmt
);
3323 stmt
->body_instructions
.push_tail(if_stmt
);
3330 ast_iteration_statement::hir(exec_list
*instructions
,
3331 struct _mesa_glsl_parse_state
*state
)
3335 /* For-loops and while-loops start a new scope, but do-while loops do not.
3337 if (mode
!= ast_do_while
)
3338 state
->symbols
->push_scope();
3340 if (init_statement
!= NULL
)
3341 init_statement
->hir(instructions
, state
);
3343 ir_loop
*const stmt
= new(ctx
) ir_loop();
3344 instructions
->push_tail(stmt
);
3346 /* Track the current loop and / or switch-statement nesting.
3348 ir_instruction
*const nesting
= state
->loop_or_switch_nesting
;
3349 ast_iteration_statement
*nesting_ast
= state
->loop_or_switch_nesting_ast
;
3351 state
->loop_or_switch_nesting
= stmt
;
3352 state
->loop_or_switch_nesting_ast
= this;
3354 if (mode
!= ast_do_while
)
3355 condition_to_hir(stmt
, state
);
3358 body
->hir(& stmt
->body_instructions
, state
);
3360 if (rest_expression
!= NULL
)
3361 rest_expression
->hir(& stmt
->body_instructions
, state
);
3363 if (mode
== ast_do_while
)
3364 condition_to_hir(stmt
, state
);
3366 if (mode
!= ast_do_while
)
3367 state
->symbols
->pop_scope();
3369 /* Restore previous nesting before returning.
3371 state
->loop_or_switch_nesting
= nesting
;
3372 state
->loop_or_switch_nesting_ast
= nesting_ast
;
3374 /* Loops do not have r-values.
3381 ast_type_specifier::hir(exec_list
*instructions
,
3382 struct _mesa_glsl_parse_state
*state
)
3384 if (!this->is_precision_statement
&& this->structure
== NULL
)
3387 YYLTYPE loc
= this->get_location();
3389 if (this->precision
!= ast_precision_none
3390 && state
->language_version
!= 100
3391 && state
->language_version
< 130) {
3392 _mesa_glsl_error(&loc
, state
,
3393 "precision qualifiers exist only in "
3394 "GLSL ES 1.00, and GLSL 1.30 and later");
3397 if (this->precision
!= ast_precision_none
3398 && this->structure
!= NULL
) {
3399 _mesa_glsl_error(&loc
, state
,
3400 "precision qualifiers do not apply to structures");
3404 /* If this is a precision statement, check that the type to which it is
3405 * applied is either float or int.
3407 * From section 4.5.3 of the GLSL 1.30 spec:
3408 * "The precision statement
3409 * precision precision-qualifier type;
3410 * can be used to establish a default precision qualifier. The type
3411 * field can be either int or float [...]. Any other types or
3412 * qualifiers will result in an error.
3414 if (this->is_precision_statement
) {
3415 assert(this->precision
!= ast_precision_none
);
3416 assert(this->structure
== NULL
); /* The check for structures was
3417 * performed above. */
3418 if (this->is_array
) {
3419 _mesa_glsl_error(&loc
, state
,
3420 "default precision statements do not apply to "
3424 if (this->type_specifier
!= ast_float
3425 && this->type_specifier
!= ast_int
) {
3426 _mesa_glsl_error(&loc
, state
,
3427 "default precision statements apply only to types "
3432 /* FINISHME: Translate precision statements into IR. */
3436 if (this->structure
!= NULL
)
3437 return this->structure
->hir(instructions
, state
);
3444 ast_struct_specifier::hir(exec_list
*instructions
,
3445 struct _mesa_glsl_parse_state
*state
)
3447 unsigned decl_count
= 0;
3449 /* Make an initial pass over the list of structure fields to determine how
3450 * many there are. Each element in this list is an ast_declarator_list.
3451 * This means that we actually need to count the number of elements in the
3452 * 'declarations' list in each of the elements.
3454 foreach_list_typed (ast_declarator_list
, decl_list
, link
,
3455 &this->declarations
) {
3456 foreach_list_const (decl_ptr
, & decl_list
->declarations
) {
3461 /* Allocate storage for the structure fields and process the field
3462 * declarations. As the declarations are processed, try to also convert
3463 * the types to HIR. This ensures that structure definitions embedded in
3464 * other structure definitions are processed.
3466 glsl_struct_field
*const fields
= ralloc_array(state
, glsl_struct_field
,
3470 foreach_list_typed (ast_declarator_list
, decl_list
, link
,
3471 &this->declarations
) {
3472 const char *type_name
;
3474 decl_list
->type
->specifier
->hir(instructions
, state
);
3476 /* Section 10.9 of the GLSL ES 1.00 specification states that
3477 * embedded structure definitions have been removed from the language.
3479 if (state
->es_shader
&& decl_list
->type
->specifier
->structure
!= NULL
) {
3480 YYLTYPE loc
= this->get_location();
3481 _mesa_glsl_error(&loc
, state
, "Embedded structure definitions are "
3482 "not allowed in GLSL ES 1.00.");
3485 const glsl_type
*decl_type
=
3486 decl_list
->type
->specifier
->glsl_type(& type_name
, state
);
3488 foreach_list_typed (ast_declaration
, decl
, link
,
3489 &decl_list
->declarations
) {
3490 const struct glsl_type
*field_type
= decl_type
;
3491 if (decl
->is_array
) {
3492 YYLTYPE loc
= decl
->get_location();
3493 field_type
= process_array_type(&loc
, decl_type
, decl
->array_size
,
3496 fields
[i
].type
= (field_type
!= NULL
)
3497 ? field_type
: glsl_type::error_type
;
3498 fields
[i
].name
= decl
->identifier
;
3503 assert(i
== decl_count
);
3505 const glsl_type
*t
=
3506 glsl_type::get_record_instance(fields
, decl_count
, this->name
);
3508 YYLTYPE loc
= this->get_location();
3509 if (!state
->symbols
->add_type(name
, t
)) {
3510 _mesa_glsl_error(& loc
, state
, "struct `%s' previously defined", name
);
3512 const glsl_type
**s
= reralloc(state
, state
->user_structures
,
3514 state
->num_user_structures
+ 1);
3516 s
[state
->num_user_structures
] = t
;
3517 state
->user_structures
= s
;
3518 state
->num_user_structures
++;
3522 /* Structure type definitions do not have r-values.