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
);
64 state
->symbols
->language_version
= state
->language_version
;
66 state
->current_function
= NULL
;
68 state
->toplevel_ir
= instructions
;
70 /* Section 4.2 of the GLSL 1.20 specification states:
71 * "The built-in functions are scoped in a scope outside the global scope
72 * users declare global variables in. That is, a shader's global scope,
73 * available for user-defined functions and global variables, is nested
74 * inside the scope containing the built-in functions."
76 * Since built-in functions like ftransform() access built-in variables,
77 * it follows that those must be in the outer scope as well.
79 * We push scope here to create this nesting effect...but don't pop.
80 * This way, a shader's globals are still in the symbol table for use
83 state
->symbols
->push_scope();
85 foreach_list_typed (ast_node
, ast
, link
, & state
->translation_unit
)
86 ast
->hir(instructions
, state
);
88 detect_recursion_unlinked(state
, instructions
);
90 state
->toplevel_ir
= NULL
;
95 * If a conversion is available, convert one operand to a different type
97 * The \c from \c ir_rvalue is converted "in place".
99 * \param to Type that the operand it to be converted to
100 * \param from Operand that is being converted
101 * \param state GLSL compiler state
104 * If a conversion is possible (or unnecessary), \c true is returned.
105 * Otherwise \c false is returned.
108 apply_implicit_conversion(const glsl_type
*to
, ir_rvalue
* &from
,
109 struct _mesa_glsl_parse_state
*state
)
112 if (to
->base_type
== from
->type
->base_type
)
115 /* This conversion was added in GLSL 1.20. If the compilation mode is
116 * GLSL 1.10, the conversion is skipped.
118 if (state
->language_version
< 120)
121 /* From page 27 (page 33 of the PDF) of the GLSL 1.50 spec:
123 * "There are no implicit array or structure conversions. For
124 * example, an array of int cannot be implicitly converted to an
125 * array of float. There are no implicit conversions between
126 * signed and unsigned integers."
128 /* FINISHME: The above comment is partially a lie. There is int/uint
129 * FINISHME: conversion for immediate constants.
131 if (!to
->is_float() || !from
->type
->is_numeric())
134 /* Convert to a floating point type with the same number of components
135 * as the original type - i.e. int to float, not int to vec4.
137 to
= glsl_type::get_instance(GLSL_TYPE_FLOAT
, from
->type
->vector_elements
,
138 from
->type
->matrix_columns
);
140 switch (from
->type
->base_type
) {
142 from
= new(ctx
) ir_expression(ir_unop_i2f
, to
, from
, NULL
);
145 from
= new(ctx
) ir_expression(ir_unop_u2f
, to
, from
, NULL
);
148 from
= new(ctx
) ir_expression(ir_unop_b2f
, to
, from
, NULL
);
158 static const struct glsl_type
*
159 arithmetic_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
161 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
163 const glsl_type
*type_a
= value_a
->type
;
164 const glsl_type
*type_b
= value_b
->type
;
166 /* From GLSL 1.50 spec, page 56:
168 * "The arithmetic binary operators add (+), subtract (-),
169 * multiply (*), and divide (/) operate on integer and
170 * floating-point scalars, vectors, and matrices."
172 if (!type_a
->is_numeric() || !type_b
->is_numeric()) {
173 _mesa_glsl_error(loc
, state
,
174 "Operands to arithmetic operators must be numeric");
175 return glsl_type::error_type
;
179 /* "If one operand is floating-point based and the other is
180 * not, then the conversions from Section 4.1.10 "Implicit
181 * Conversions" are applied to the non-floating-point-based operand."
183 if (!apply_implicit_conversion(type_a
, value_b
, state
)
184 && !apply_implicit_conversion(type_b
, value_a
, state
)) {
185 _mesa_glsl_error(loc
, state
,
186 "Could not implicitly convert operands to "
187 "arithmetic operator");
188 return glsl_type::error_type
;
190 type_a
= value_a
->type
;
191 type_b
= value_b
->type
;
193 /* "If the operands are integer types, they must both be signed or
196 * From this rule and the preceeding conversion it can be inferred that
197 * both types must be GLSL_TYPE_FLOAT, or GLSL_TYPE_UINT, or GLSL_TYPE_INT.
198 * The is_numeric check above already filtered out the case where either
199 * type is not one of these, so now the base types need only be tested for
202 if (type_a
->base_type
!= type_b
->base_type
) {
203 _mesa_glsl_error(loc
, state
,
204 "base type mismatch for arithmetic operator");
205 return glsl_type::error_type
;
208 /* "All arithmetic binary operators result in the same fundamental type
209 * (signed integer, unsigned integer, or floating-point) as the
210 * operands they operate on, after operand type conversion. After
211 * conversion, the following cases are valid
213 * * The two operands are scalars. In this case the operation is
214 * applied, resulting in a scalar."
216 if (type_a
->is_scalar() && type_b
->is_scalar())
219 /* "* One operand is a scalar, and the other is a vector or matrix.
220 * In this case, the scalar operation is applied independently to each
221 * component of the vector or matrix, resulting in the same size
224 if (type_a
->is_scalar()) {
225 if (!type_b
->is_scalar())
227 } else if (type_b
->is_scalar()) {
231 /* All of the combinations of <scalar, scalar>, <vector, scalar>,
232 * <scalar, vector>, <scalar, matrix>, and <matrix, scalar> have been
235 assert(!type_a
->is_scalar());
236 assert(!type_b
->is_scalar());
238 /* "* The two operands are vectors of the same size. In this case, the
239 * operation is done component-wise resulting in the same size
242 if (type_a
->is_vector() && type_b
->is_vector()) {
243 if (type_a
== type_b
) {
246 _mesa_glsl_error(loc
, state
,
247 "vector size mismatch for arithmetic operator");
248 return glsl_type::error_type
;
252 /* All of the combinations of <scalar, scalar>, <vector, scalar>,
253 * <scalar, vector>, <scalar, matrix>, <matrix, scalar>, and
254 * <vector, vector> have been handled. At least one of the operands must
255 * be matrix. Further, since there are no integer matrix types, the base
256 * type of both operands must be float.
258 assert(type_a
->is_matrix() || type_b
->is_matrix());
259 assert(type_a
->base_type
== GLSL_TYPE_FLOAT
);
260 assert(type_b
->base_type
== GLSL_TYPE_FLOAT
);
262 /* "* The operator is add (+), subtract (-), or divide (/), and the
263 * operands are matrices with the same number of rows and the same
264 * number of columns. In this case, the operation is done component-
265 * wise resulting in the same size matrix."
266 * * The operator is multiply (*), where both operands are matrices or
267 * one operand is a vector and the other a matrix. A right vector
268 * operand is treated as a column vector and a left vector operand as a
269 * row vector. In all these cases, it is required that the number of
270 * columns of the left operand is equal to the number of rows of the
271 * right operand. Then, the multiply (*) operation does a linear
272 * algebraic multiply, yielding an object that has the same number of
273 * rows as the left operand and the same number of columns as the right
274 * operand. Section 5.10 "Vector and Matrix Operations" explains in
275 * more detail how vectors and matrices are operated on."
278 if (type_a
== type_b
)
281 if (type_a
->is_matrix() && type_b
->is_matrix()) {
282 /* Matrix multiply. The columns of A must match the rows of B. Given
283 * the other previously tested constraints, this means the vector type
284 * of a row from A must be the same as the vector type of a column from
287 if (type_a
->row_type() == type_b
->column_type()) {
288 /* The resulting matrix has the number of columns of matrix B and
289 * the number of rows of matrix A. We get the row count of A by
290 * looking at the size of a vector that makes up a column. The
291 * transpose (size of a row) is done for B.
293 const glsl_type
*const type
=
294 glsl_type::get_instance(type_a
->base_type
,
295 type_a
->column_type()->vector_elements
,
296 type_b
->row_type()->vector_elements
);
297 assert(type
!= glsl_type::error_type
);
301 } else if (type_a
->is_matrix()) {
302 /* A is a matrix and B is a column vector. Columns of A must match
303 * rows of B. Given the other previously tested constraints, this
304 * means the vector type of a row from A must be the same as the
305 * vector the type of B.
307 if (type_a
->row_type() == type_b
) {
308 /* The resulting vector has a number of elements equal to
309 * the number of rows of matrix A. */
310 const glsl_type
*const type
=
311 glsl_type::get_instance(type_a
->base_type
,
312 type_a
->column_type()->vector_elements
,
314 assert(type
!= glsl_type::error_type
);
319 assert(type_b
->is_matrix());
321 /* A is a row vector and B is a matrix. Columns of A must match rows
322 * of B. Given the other previously tested constraints, this means
323 * the type of A must be the same as the vector type of a column from
326 if (type_a
== type_b
->column_type()) {
327 /* The resulting vector has a number of elements equal to
328 * the number of columns of matrix B. */
329 const glsl_type
*const type
=
330 glsl_type::get_instance(type_a
->base_type
,
331 type_b
->row_type()->vector_elements
,
333 assert(type
!= glsl_type::error_type
);
339 _mesa_glsl_error(loc
, state
, "size mismatch for matrix multiplication");
340 return glsl_type::error_type
;
344 /* "All other cases are illegal."
346 _mesa_glsl_error(loc
, state
, "type mismatch");
347 return glsl_type::error_type
;
351 static const struct glsl_type
*
352 unary_arithmetic_result_type(const struct glsl_type
*type
,
353 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
355 /* From GLSL 1.50 spec, page 57:
357 * "The arithmetic unary operators negate (-), post- and pre-increment
358 * and decrement (-- and ++) operate on integer or floating-point
359 * values (including vectors and matrices). All unary operators work
360 * component-wise on their operands. These result with the same type
363 if (!type
->is_numeric()) {
364 _mesa_glsl_error(loc
, state
,
365 "Operands to arithmetic operators must be numeric");
366 return glsl_type::error_type
;
373 * \brief Return the result type of a bit-logic operation.
375 * If the given types to the bit-logic operator are invalid, return
376 * glsl_type::error_type.
378 * \param type_a Type of LHS of bit-logic op
379 * \param type_b Type of RHS of bit-logic op
381 static const struct glsl_type
*
382 bit_logic_result_type(const struct glsl_type
*type_a
,
383 const struct glsl_type
*type_b
,
385 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
387 if (state
->language_version
< 130) {
388 _mesa_glsl_error(loc
, state
, "bit operations require GLSL 1.30");
389 return glsl_type::error_type
;
392 /* From page 50 (page 56 of PDF) of GLSL 1.30 spec:
394 * "The bitwise operators and (&), exclusive-or (^), and inclusive-or
395 * (|). The operands must be of type signed or unsigned integers or
398 if (!type_a
->is_integer()) {
399 _mesa_glsl_error(loc
, state
, "LHS of `%s' must be an integer",
400 ast_expression::operator_string(op
));
401 return glsl_type::error_type
;
403 if (!type_b
->is_integer()) {
404 _mesa_glsl_error(loc
, state
, "RHS of `%s' must be an integer",
405 ast_expression::operator_string(op
));
406 return glsl_type::error_type
;
409 /* "The fundamental types of the operands (signed or unsigned) must
412 if (type_a
->base_type
!= type_b
->base_type
) {
413 _mesa_glsl_error(loc
, state
, "operands of `%s' must have the same "
414 "base type", ast_expression::operator_string(op
));
415 return glsl_type::error_type
;
418 /* "The operands cannot be vectors of differing size." */
419 if (type_a
->is_vector() &&
420 type_b
->is_vector() &&
421 type_a
->vector_elements
!= type_b
->vector_elements
) {
422 _mesa_glsl_error(loc
, state
, "operands of `%s' cannot be vectors of "
423 "different sizes", ast_expression::operator_string(op
));
424 return glsl_type::error_type
;
427 /* "If one operand is a scalar and the other a vector, the scalar is
428 * applied component-wise to the vector, resulting in the same type as
429 * the vector. The fundamental types of the operands [...] will be the
430 * resulting fundamental type."
432 if (type_a
->is_scalar())
438 static const struct glsl_type
*
439 modulus_result_type(const struct glsl_type
*type_a
,
440 const struct glsl_type
*type_b
,
441 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
443 if (state
->language_version
< 130) {
444 _mesa_glsl_error(loc
, state
,
445 "operator '%%' is reserved in %s",
446 state
->version_string
);
447 return glsl_type::error_type
;
450 /* From GLSL 1.50 spec, page 56:
451 * "The operator modulus (%) operates on signed or unsigned integers or
452 * integer vectors. The operand types must both be signed or both be
455 if (!type_a
->is_integer()) {
456 _mesa_glsl_error(loc
, state
, "LHS of operator %% must be an integer.");
457 return glsl_type::error_type
;
459 if (!type_b
->is_integer()) {
460 _mesa_glsl_error(loc
, state
, "RHS of operator %% must be an integer.");
461 return glsl_type::error_type
;
463 if (type_a
->base_type
!= type_b
->base_type
) {
464 _mesa_glsl_error(loc
, state
,
465 "operands of %% must have the same base type");
466 return glsl_type::error_type
;
469 /* "The operands cannot be vectors of differing size. If one operand is
470 * a scalar and the other vector, then the scalar is applied component-
471 * wise to the vector, resulting in the same type as the vector. If both
472 * are vectors of the same size, the result is computed component-wise."
474 if (type_a
->is_vector()) {
475 if (!type_b
->is_vector()
476 || (type_a
->vector_elements
== type_b
->vector_elements
))
481 /* "The operator modulus (%) is not defined for any other data types
482 * (non-integer types)."
484 _mesa_glsl_error(loc
, state
, "type mismatch");
485 return glsl_type::error_type
;
489 static const struct glsl_type
*
490 relational_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
491 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
493 const glsl_type
*type_a
= value_a
->type
;
494 const glsl_type
*type_b
= value_b
->type
;
496 /* From GLSL 1.50 spec, page 56:
497 * "The relational operators greater than (>), less than (<), greater
498 * than or equal (>=), and less than or equal (<=) operate only on
499 * scalar integer and scalar floating-point expressions."
501 if (!type_a
->is_numeric()
502 || !type_b
->is_numeric()
503 || !type_a
->is_scalar()
504 || !type_b
->is_scalar()) {
505 _mesa_glsl_error(loc
, state
,
506 "Operands to relational operators must be scalar and "
508 return glsl_type::error_type
;
511 /* "Either the operands' types must match, or the conversions from
512 * Section 4.1.10 "Implicit Conversions" will be applied to the integer
513 * operand, after which the types must match."
515 if (!apply_implicit_conversion(type_a
, value_b
, state
)
516 && !apply_implicit_conversion(type_b
, value_a
, state
)) {
517 _mesa_glsl_error(loc
, state
,
518 "Could not implicitly convert operands to "
519 "relational operator");
520 return glsl_type::error_type
;
522 type_a
= value_a
->type
;
523 type_b
= value_b
->type
;
525 if (type_a
->base_type
!= type_b
->base_type
) {
526 _mesa_glsl_error(loc
, state
, "base type mismatch");
527 return glsl_type::error_type
;
530 /* "The result is scalar Boolean."
532 return glsl_type::bool_type
;
536 * \brief Return the result type of a bit-shift operation.
538 * If the given types to the bit-shift operator are invalid, return
539 * glsl_type::error_type.
541 * \param type_a Type of LHS of bit-shift op
542 * \param type_b Type of RHS of bit-shift op
544 static const struct glsl_type
*
545 shift_result_type(const struct glsl_type
*type_a
,
546 const struct glsl_type
*type_b
,
548 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
550 if (state
->language_version
< 130) {
551 _mesa_glsl_error(loc
, state
, "bit operations require GLSL 1.30");
552 return glsl_type::error_type
;
555 /* From page 50 (page 56 of the PDF) of the GLSL 1.30 spec:
557 * "The shift operators (<<) and (>>). For both operators, the operands
558 * must be signed or unsigned integers or integer vectors. One operand
559 * can be signed while the other is unsigned."
561 if (!type_a
->is_integer()) {
562 _mesa_glsl_error(loc
, state
, "LHS of operator %s must be an integer or "
563 "integer vector", ast_expression::operator_string(op
));
564 return glsl_type::error_type
;
567 if (!type_b
->is_integer()) {
568 _mesa_glsl_error(loc
, state
, "RHS of operator %s must be an integer or "
569 "integer vector", ast_expression::operator_string(op
));
570 return glsl_type::error_type
;
573 /* "If the first operand is a scalar, the second operand has to be
576 if (type_a
->is_scalar() && !type_b
->is_scalar()) {
577 _mesa_glsl_error(loc
, state
, "If the first operand of %s is scalar, the "
578 "second must be scalar as well",
579 ast_expression::operator_string(op
));
580 return glsl_type::error_type
;
583 /* If both operands are vectors, check that they have same number of
586 if (type_a
->is_vector() &&
587 type_b
->is_vector() &&
588 type_a
->vector_elements
!= type_b
->vector_elements
) {
589 _mesa_glsl_error(loc
, state
, "Vector operands to operator %s must "
590 "have same number of elements",
591 ast_expression::operator_string(op
));
592 return glsl_type::error_type
;
595 /* "In all cases, the resulting type will be the same type as the left
602 * Validates that a value can be assigned to a location with a specified type
604 * Validates that \c rhs can be assigned to some location. If the types are
605 * not an exact match but an automatic conversion is possible, \c rhs will be
609 * \c NULL if \c rhs cannot be assigned to a location with type \c lhs_type.
610 * Otherwise the actual RHS to be assigned will be returned. This may be
611 * \c rhs, or it may be \c rhs after some type conversion.
614 * In addition to being used for assignments, this function is used to
615 * type-check return values.
618 validate_assignment(struct _mesa_glsl_parse_state
*state
,
619 const glsl_type
*lhs_type
, ir_rvalue
*rhs
,
622 /* If there is already some error in the RHS, just return it. Anything
623 * else will lead to an avalanche of error message back to the user.
625 if (rhs
->type
->is_error())
628 /* If the types are identical, the assignment can trivially proceed.
630 if (rhs
->type
== lhs_type
)
633 /* If the array element types are the same and the size of the LHS is zero,
634 * the assignment is okay for initializers embedded in variable
637 * Note: Whole-array assignments are not permitted in GLSL 1.10, but this
638 * is handled by ir_dereference::is_lvalue.
640 if (is_initializer
&& lhs_type
->is_array() && rhs
->type
->is_array()
641 && (lhs_type
->element_type() == rhs
->type
->element_type())
642 && (lhs_type
->array_size() == 0)) {
646 /* Check for implicit conversion in GLSL 1.20 */
647 if (apply_implicit_conversion(lhs_type
, rhs
, state
)) {
648 if (rhs
->type
== lhs_type
)
656 mark_whole_array_access(ir_rvalue
*access
)
658 ir_dereference_variable
*deref
= access
->as_dereference_variable();
660 if (deref
&& deref
->var
) {
661 deref
->var
->max_array_access
= deref
->type
->length
- 1;
666 do_assignment(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
,
667 const char *non_lvalue_description
,
668 ir_rvalue
*lhs
, ir_rvalue
*rhs
, bool is_initializer
,
672 bool error_emitted
= (lhs
->type
->is_error() || rhs
->type
->is_error());
674 if (!error_emitted
) {
675 if (non_lvalue_description
!= NULL
) {
676 _mesa_glsl_error(&lhs_loc
, state
,
678 non_lvalue_description
);
679 error_emitted
= true;
680 } else if (lhs
->variable_referenced() != NULL
681 && lhs
->variable_referenced()->read_only
) {
682 _mesa_glsl_error(&lhs_loc
, state
,
683 "assignment to read-only variable '%s'",
684 lhs
->variable_referenced()->name
);
685 error_emitted
= true;
687 } else if (state
->language_version
<= 110 && lhs
->type
->is_array()) {
688 /* From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
690 * "Other binary or unary expressions, non-dereferenced
691 * arrays, function names, swizzles with repeated fields,
692 * and constants cannot be l-values."
694 _mesa_glsl_error(&lhs_loc
, state
, "whole array assignment is not "
695 "allowed in GLSL 1.10 or GLSL ES 1.00.");
696 error_emitted
= true;
697 } else if (!lhs
->is_lvalue()) {
698 _mesa_glsl_error(& lhs_loc
, state
, "non-lvalue in assignment");
699 error_emitted
= true;
704 validate_assignment(state
, lhs
->type
, rhs
, is_initializer
);
705 if (new_rhs
== NULL
) {
706 _mesa_glsl_error(& lhs_loc
, state
, "type mismatch");
710 /* If the LHS array was not declared with a size, it takes it size from
711 * the RHS. If the LHS is an l-value and a whole array, it must be a
712 * dereference of a variable. Any other case would require that the LHS
713 * is either not an l-value or not a whole array.
715 if (lhs
->type
->array_size() == 0) {
716 ir_dereference
*const d
= lhs
->as_dereference();
720 ir_variable
*const var
= d
->variable_referenced();
724 if (var
->max_array_access
>= unsigned(rhs
->type
->array_size())) {
725 /* FINISHME: This should actually log the location of the RHS. */
726 _mesa_glsl_error(& lhs_loc
, state
, "array size must be > %u due to "
728 var
->max_array_access
);
731 var
->type
= glsl_type::get_array_instance(lhs
->type
->element_type(),
732 rhs
->type
->array_size());
735 mark_whole_array_access(rhs
);
736 mark_whole_array_access(lhs
);
739 /* Most callers of do_assignment (assign, add_assign, pre_inc/dec,
740 * but not post_inc) need the converted assigned value as an rvalue
741 * to handle things like:
745 * So we always just store the computed value being assigned to a
746 * temporary and return a deref of that temporary. If the rvalue
747 * ends up not being used, the temp will get copy-propagated out.
749 ir_variable
*var
= new(ctx
) ir_variable(rhs
->type
, "assignment_tmp",
751 ir_dereference_variable
*deref_var
= new(ctx
) ir_dereference_variable(var
);
752 instructions
->push_tail(var
);
753 instructions
->push_tail(new(ctx
) ir_assignment(deref_var
,
756 deref_var
= new(ctx
) ir_dereference_variable(var
);
759 instructions
->push_tail(new(ctx
) ir_assignment(lhs
, deref_var
, NULL
));
761 return new(ctx
) ir_dereference_variable(var
);
765 get_lvalue_copy(exec_list
*instructions
, ir_rvalue
*lvalue
)
767 void *ctx
= ralloc_parent(lvalue
);
770 var
= new(ctx
) ir_variable(lvalue
->type
, "_post_incdec_tmp",
772 instructions
->push_tail(var
);
773 var
->mode
= ir_var_auto
;
775 instructions
->push_tail(new(ctx
) ir_assignment(new(ctx
) ir_dereference_variable(var
),
778 return new(ctx
) ir_dereference_variable(var
);
783 ast_node::hir(exec_list
*instructions
,
784 struct _mesa_glsl_parse_state
*state
)
793 do_comparison(void *mem_ctx
, int operation
, ir_rvalue
*op0
, ir_rvalue
*op1
)
796 ir_rvalue
*cmp
= NULL
;
798 if (operation
== ir_binop_all_equal
)
799 join_op
= ir_binop_logic_and
;
801 join_op
= ir_binop_logic_or
;
803 switch (op0
->type
->base_type
) {
804 case GLSL_TYPE_FLOAT
:
808 return new(mem_ctx
) ir_expression(operation
, op0
, op1
);
810 case GLSL_TYPE_ARRAY
: {
811 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
812 ir_rvalue
*e0
, *e1
, *result
;
814 e0
= new(mem_ctx
) ir_dereference_array(op0
->clone(mem_ctx
, NULL
),
815 new(mem_ctx
) ir_constant(i
));
816 e1
= new(mem_ctx
) ir_dereference_array(op1
->clone(mem_ctx
, NULL
),
817 new(mem_ctx
) ir_constant(i
));
818 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
821 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
827 mark_whole_array_access(op0
);
828 mark_whole_array_access(op1
);
832 case GLSL_TYPE_STRUCT
: {
833 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
834 ir_rvalue
*e0
, *e1
, *result
;
835 const char *field_name
= op0
->type
->fields
.structure
[i
].name
;
837 e0
= new(mem_ctx
) ir_dereference_record(op0
->clone(mem_ctx
, NULL
),
839 e1
= new(mem_ctx
) ir_dereference_record(op1
->clone(mem_ctx
, NULL
),
841 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
844 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
852 case GLSL_TYPE_ERROR
:
854 case GLSL_TYPE_SAMPLER
:
855 /* I assume a comparison of a struct containing a sampler just
856 * ignores the sampler present in the type.
861 assert(!"Should not get here.");
866 cmp
= new(mem_ctx
) ir_constant(true);
871 /* For logical operations, we want to ensure that the operands are
872 * scalar booleans. If it isn't, emit an error and return a constant
873 * boolean to avoid triggering cascading error messages.
876 get_scalar_boolean_operand(exec_list
*instructions
,
877 struct _mesa_glsl_parse_state
*state
,
878 ast_expression
*parent_expr
,
880 const char *operand_name
,
883 ast_expression
*expr
= parent_expr
->subexpressions
[operand
];
885 ir_rvalue
*val
= expr
->hir(instructions
, state
);
887 if (val
->type
->is_boolean() && val
->type
->is_scalar())
890 if (!*error_emitted
) {
891 YYLTYPE loc
= expr
->get_location();
892 _mesa_glsl_error(&loc
, state
, "%s of `%s' must be scalar boolean",
894 parent_expr
->operator_string(parent_expr
->oper
));
895 *error_emitted
= true;
898 return new(ctx
) ir_constant(true);
902 * If name refers to a builtin array whose maximum allowed size is less than
903 * size, report an error and return true. Otherwise return false.
906 check_builtin_array_max_size(const char *name
, unsigned size
,
907 YYLTYPE loc
, struct _mesa_glsl_parse_state
*state
)
909 if ((strcmp("gl_TexCoord", name
) == 0)
910 && (size
> state
->Const
.MaxTextureCoords
)) {
911 /* From page 54 (page 60 of the PDF) of the GLSL 1.20 spec:
913 * "The size [of gl_TexCoord] can be at most
914 * gl_MaxTextureCoords."
916 _mesa_glsl_error(&loc
, state
, "`gl_TexCoord' array size cannot "
917 "be larger than gl_MaxTextureCoords (%u)\n",
918 state
->Const
.MaxTextureCoords
);
920 } else if (strcmp("gl_ClipDistance", name
) == 0
921 && size
> state
->Const
.MaxClipPlanes
) {
922 /* From section 7.1 (Vertex Shader Special Variables) of the
925 * "The gl_ClipDistance array is predeclared as unsized and
926 * must be sized by the shader either redeclaring it with a
927 * size or indexing it only with integral constant
928 * expressions. ... The size can be at most
929 * gl_MaxClipDistances."
931 _mesa_glsl_error(&loc
, state
, "`gl_ClipDistance' array size cannot "
932 "be larger than gl_MaxClipDistances (%u)\n",
933 state
->Const
.MaxClipPlanes
);
940 * Create the constant 1, of a which is appropriate for incrementing and
941 * decrementing values of the given GLSL type. For example, if type is vec4,
942 * this creates a constant value of 1.0 having type float.
944 * If the given type is invalid for increment and decrement operators, return
945 * a floating point 1--the error will be detected later.
948 constant_one_for_inc_dec(void *ctx
, const glsl_type
*type
)
950 switch (type
->base_type
) {
952 return new(ctx
) ir_constant((unsigned) 1);
954 return new(ctx
) ir_constant(1);
956 case GLSL_TYPE_FLOAT
:
957 return new(ctx
) ir_constant(1.0f
);
962 ast_expression::hir(exec_list
*instructions
,
963 struct _mesa_glsl_parse_state
*state
)
966 static const int operations
[AST_NUM_OPERATORS
] = {
967 -1, /* ast_assign doesn't convert to ir_expression. */
968 -1, /* ast_plus doesn't convert to ir_expression. */
992 /* Note: The following block of expression types actually convert
993 * to multiple IR instructions.
995 ir_binop_mul
, /* ast_mul_assign */
996 ir_binop_div
, /* ast_div_assign */
997 ir_binop_mod
, /* ast_mod_assign */
998 ir_binop_add
, /* ast_add_assign */
999 ir_binop_sub
, /* ast_sub_assign */
1000 ir_binop_lshift
, /* ast_ls_assign */
1001 ir_binop_rshift
, /* ast_rs_assign */
1002 ir_binop_bit_and
, /* ast_and_assign */
1003 ir_binop_bit_xor
, /* ast_xor_assign */
1004 ir_binop_bit_or
, /* ast_or_assign */
1006 -1, /* ast_conditional doesn't convert to ir_expression. */
1007 ir_binop_add
, /* ast_pre_inc. */
1008 ir_binop_sub
, /* ast_pre_dec. */
1009 ir_binop_add
, /* ast_post_inc. */
1010 ir_binop_sub
, /* ast_post_dec. */
1011 -1, /* ast_field_selection doesn't conv to ir_expression. */
1012 -1, /* ast_array_index doesn't convert to ir_expression. */
1013 -1, /* ast_function_call doesn't conv to ir_expression. */
1014 -1, /* ast_identifier doesn't convert to ir_expression. */
1015 -1, /* ast_int_constant doesn't convert to ir_expression. */
1016 -1, /* ast_uint_constant doesn't conv to ir_expression. */
1017 -1, /* ast_float_constant doesn't conv to ir_expression. */
1018 -1, /* ast_bool_constant doesn't conv to ir_expression. */
1019 -1, /* ast_sequence doesn't convert to ir_expression. */
1021 ir_rvalue
*result
= NULL
;
1023 const struct glsl_type
*type
; /* a temporary variable for switch cases */
1024 bool error_emitted
= false;
1027 loc
= this->get_location();
1029 switch (this->oper
) {
1031 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1032 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1034 result
= do_assignment(instructions
, state
,
1035 this->subexpressions
[0]->non_lvalue_description
,
1036 op
[0], op
[1], false,
1037 this->subexpressions
[0]->get_location());
1038 error_emitted
= result
->type
->is_error();
1043 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1045 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1047 error_emitted
= type
->is_error();
1053 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1055 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1057 error_emitted
= type
->is_error();
1059 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1067 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1068 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1070 type
= arithmetic_result_type(op
[0], op
[1],
1071 (this->oper
== ast_mul
),
1073 error_emitted
= type
->is_error();
1075 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1080 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1081 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1083 type
= modulus_result_type(op
[0]->type
, op
[1]->type
, state
, & loc
);
1085 assert(operations
[this->oper
] == ir_binop_mod
);
1087 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1089 error_emitted
= type
->is_error();
1094 if (state
->language_version
< 130) {
1095 _mesa_glsl_error(&loc
, state
, "operator %s requires GLSL 1.30",
1096 operator_string(this->oper
));
1097 error_emitted
= true;
1100 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1101 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1102 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1104 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1106 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1113 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1114 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1116 type
= relational_result_type(op
[0], op
[1], state
, & loc
);
1118 /* The relational operators must either generate an error or result
1119 * in a scalar boolean. See page 57 of the GLSL 1.50 spec.
1121 assert(type
->is_error()
1122 || ((type
->base_type
== GLSL_TYPE_BOOL
)
1123 && type
->is_scalar()));
1125 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1127 error_emitted
= type
->is_error();
1132 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1133 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1135 /* From page 58 (page 64 of the PDF) of the GLSL 1.50 spec:
1137 * "The equality operators equal (==), and not equal (!=)
1138 * operate on all types. They result in a scalar Boolean. If
1139 * the operand types do not match, then there must be a
1140 * conversion from Section 4.1.10 "Implicit Conversions"
1141 * applied to one operand that can make them match, in which
1142 * case this conversion is done."
1144 if ((!apply_implicit_conversion(op
[0]->type
, op
[1], state
)
1145 && !apply_implicit_conversion(op
[1]->type
, op
[0], state
))
1146 || (op
[0]->type
!= op
[1]->type
)) {
1147 _mesa_glsl_error(& loc
, state
, "operands of `%s' must have the same "
1148 "type", (this->oper
== ast_equal
) ? "==" : "!=");
1149 error_emitted
= true;
1150 } else if ((state
->language_version
<= 110)
1151 && (op
[0]->type
->is_array() || op
[1]->type
->is_array())) {
1152 _mesa_glsl_error(& loc
, state
, "array comparisons forbidden in "
1154 error_emitted
= true;
1157 if (error_emitted
) {
1158 result
= new(ctx
) ir_constant(false);
1160 result
= do_comparison(ctx
, operations
[this->oper
], op
[0], op
[1]);
1161 assert(result
->type
== glsl_type::bool_type
);
1168 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1169 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1170 type
= bit_logic_result_type(op
[0]->type
, op
[1]->type
, this->oper
,
1172 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1174 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1178 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1180 if (state
->language_version
< 130) {
1181 _mesa_glsl_error(&loc
, state
, "bit-wise operations require GLSL 1.30");
1182 error_emitted
= true;
1185 if (!op
[0]->type
->is_integer()) {
1186 _mesa_glsl_error(&loc
, state
, "operand of `~' must be an integer");
1187 error_emitted
= true;
1190 type
= error_emitted
? glsl_type::error_type
: op
[0]->type
;
1191 result
= new(ctx
) ir_expression(ir_unop_bit_not
, type
, op
[0], NULL
);
1194 case ast_logic_and
: {
1195 exec_list rhs_instructions
;
1196 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1197 "LHS", &error_emitted
);
1198 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1199 "RHS", &error_emitted
);
1201 ir_constant
*op0_const
= op
[0]->constant_expression_value();
1203 if (op0_const
->value
.b
[0]) {
1204 instructions
->append_list(&rhs_instructions
);
1209 type
= glsl_type::bool_type
;
1211 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1214 instructions
->push_tail(tmp
);
1216 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1217 instructions
->push_tail(stmt
);
1219 stmt
->then_instructions
.append_list(&rhs_instructions
);
1220 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1221 ir_assignment
*const then_assign
=
1222 new(ctx
) ir_assignment(then_deref
, op
[1], NULL
);
1223 stmt
->then_instructions
.push_tail(then_assign
);
1225 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1226 ir_assignment
*const else_assign
=
1227 new(ctx
) ir_assignment(else_deref
, new(ctx
) ir_constant(false), NULL
);
1228 stmt
->else_instructions
.push_tail(else_assign
);
1230 result
= new(ctx
) ir_dereference_variable(tmp
);
1236 case ast_logic_or
: {
1237 exec_list rhs_instructions
;
1238 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1239 "LHS", &error_emitted
);
1240 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1241 "RHS", &error_emitted
);
1243 ir_constant
*op0_const
= op
[0]->constant_expression_value();
1245 if (op0_const
->value
.b
[0]) {
1250 type
= glsl_type::bool_type
;
1252 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1255 instructions
->push_tail(tmp
);
1257 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1258 instructions
->push_tail(stmt
);
1260 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1261 ir_assignment
*const then_assign
=
1262 new(ctx
) ir_assignment(then_deref
, new(ctx
) ir_constant(true), NULL
);
1263 stmt
->then_instructions
.push_tail(then_assign
);
1265 stmt
->else_instructions
.append_list(&rhs_instructions
);
1266 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1267 ir_assignment
*const else_assign
=
1268 new(ctx
) ir_assignment(else_deref
, op
[1], NULL
);
1269 stmt
->else_instructions
.push_tail(else_assign
);
1271 result
= new(ctx
) ir_dereference_variable(tmp
);
1278 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1280 * "The logical binary operators and (&&), or ( | | ), and
1281 * exclusive or (^^). They operate only on two Boolean
1282 * expressions and result in a Boolean expression."
1284 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0, "LHS",
1286 op
[1] = get_scalar_boolean_operand(instructions
, state
, this, 1, "RHS",
1289 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1294 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1295 "operand", &error_emitted
);
1297 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1301 case ast_mul_assign
:
1302 case ast_div_assign
:
1303 case ast_add_assign
:
1304 case ast_sub_assign
: {
1305 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1306 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1308 type
= arithmetic_result_type(op
[0], op
[1],
1309 (this->oper
== ast_mul_assign
),
1312 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1315 result
= do_assignment(instructions
, state
,
1316 this->subexpressions
[0]->non_lvalue_description
,
1317 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1318 this->subexpressions
[0]->get_location());
1319 error_emitted
= (op
[0]->type
->is_error());
1321 /* GLSL 1.10 does not allow array assignment. However, we don't have to
1322 * explicitly test for this because none of the binary expression
1323 * operators allow array operands either.
1329 case ast_mod_assign
: {
1330 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1331 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1333 type
= modulus_result_type(op
[0]->type
, op
[1]->type
, state
, & loc
);
1335 assert(operations
[this->oper
] == ir_binop_mod
);
1337 ir_rvalue
*temp_rhs
;
1338 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1341 result
= do_assignment(instructions
, state
,
1342 this->subexpressions
[0]->non_lvalue_description
,
1343 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1344 this->subexpressions
[0]->get_location());
1345 error_emitted
= type
->is_error();
1350 case ast_rs_assign
: {
1351 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1352 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1353 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1355 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1356 type
, op
[0], op
[1]);
1357 result
= do_assignment(instructions
, state
,
1358 this->subexpressions
[0]->non_lvalue_description
,
1359 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1360 this->subexpressions
[0]->get_location());
1361 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1365 case ast_and_assign
:
1366 case ast_xor_assign
:
1367 case ast_or_assign
: {
1368 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1369 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1370 type
= bit_logic_result_type(op
[0]->type
, op
[1]->type
, this->oper
,
1372 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1373 type
, op
[0], op
[1]);
1374 result
= do_assignment(instructions
, state
,
1375 this->subexpressions
[0]->non_lvalue_description
,
1376 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1377 this->subexpressions
[0]->get_location());
1378 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1382 case ast_conditional
: {
1383 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1385 * "The ternary selection operator (?:). It operates on three
1386 * expressions (exp1 ? exp2 : exp3). This operator evaluates the
1387 * first expression, which must result in a scalar Boolean."
1389 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1390 "condition", &error_emitted
);
1392 /* The :? operator is implemented by generating an anonymous temporary
1393 * followed by an if-statement. The last instruction in each branch of
1394 * the if-statement assigns a value to the anonymous temporary. This
1395 * temporary is the r-value of the expression.
1397 exec_list then_instructions
;
1398 exec_list else_instructions
;
1400 op
[1] = this->subexpressions
[1]->hir(&then_instructions
, state
);
1401 op
[2] = this->subexpressions
[2]->hir(&else_instructions
, state
);
1403 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1405 * "The second and third expressions can be any type, as
1406 * long their types match, or there is a conversion in
1407 * Section 4.1.10 "Implicit Conversions" that can be applied
1408 * to one of the expressions to make their types match. This
1409 * resulting matching type is the type of the entire
1412 if ((!apply_implicit_conversion(op
[1]->type
, op
[2], state
)
1413 && !apply_implicit_conversion(op
[2]->type
, op
[1], state
))
1414 || (op
[1]->type
!= op
[2]->type
)) {
1415 YYLTYPE loc
= this->subexpressions
[1]->get_location();
1417 _mesa_glsl_error(& loc
, state
, "Second and third operands of ?: "
1418 "operator must have matching types.");
1419 error_emitted
= true;
1420 type
= glsl_type::error_type
;
1425 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1427 * "The second and third expressions must be the same type, but can
1428 * be of any type other than an array."
1430 if ((state
->language_version
<= 110) && type
->is_array()) {
1431 _mesa_glsl_error(& loc
, state
, "Second and third operands of ?: "
1432 "operator must not be arrays.");
1433 error_emitted
= true;
1436 ir_constant
*cond_val
= op
[0]->constant_expression_value();
1437 ir_constant
*then_val
= op
[1]->constant_expression_value();
1438 ir_constant
*else_val
= op
[2]->constant_expression_value();
1440 if (then_instructions
.is_empty()
1441 && else_instructions
.is_empty()
1442 && (cond_val
!= NULL
) && (then_val
!= NULL
) && (else_val
!= NULL
)) {
1443 result
= (cond_val
->value
.b
[0]) ? then_val
: else_val
;
1445 ir_variable
*const tmp
=
1446 new(ctx
) ir_variable(type
, "conditional_tmp", ir_var_temporary
);
1447 instructions
->push_tail(tmp
);
1449 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1450 instructions
->push_tail(stmt
);
1452 then_instructions
.move_nodes_to(& stmt
->then_instructions
);
1453 ir_dereference
*const then_deref
=
1454 new(ctx
) ir_dereference_variable(tmp
);
1455 ir_assignment
*const then_assign
=
1456 new(ctx
) ir_assignment(then_deref
, op
[1], NULL
);
1457 stmt
->then_instructions
.push_tail(then_assign
);
1459 else_instructions
.move_nodes_to(& stmt
->else_instructions
);
1460 ir_dereference
*const else_deref
=
1461 new(ctx
) ir_dereference_variable(tmp
);
1462 ir_assignment
*const else_assign
=
1463 new(ctx
) ir_assignment(else_deref
, op
[2], NULL
);
1464 stmt
->else_instructions
.push_tail(else_assign
);
1466 result
= new(ctx
) ir_dereference_variable(tmp
);
1473 this->non_lvalue_description
= (this->oper
== ast_pre_inc
)
1474 ? "pre-increment operation" : "pre-decrement operation";
1476 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1477 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1479 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1481 ir_rvalue
*temp_rhs
;
1482 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1485 result
= do_assignment(instructions
, state
,
1486 this->subexpressions
[0]->non_lvalue_description
,
1487 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1488 this->subexpressions
[0]->get_location());
1489 error_emitted
= op
[0]->type
->is_error();
1494 case ast_post_dec
: {
1495 this->non_lvalue_description
= (this->oper
== ast_post_inc
)
1496 ? "post-increment operation" : "post-decrement operation";
1497 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1498 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1500 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1502 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1504 ir_rvalue
*temp_rhs
;
1505 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1508 /* Get a temporary of a copy of the lvalue before it's modified.
1509 * This may get thrown away later.
1511 result
= get_lvalue_copy(instructions
, op
[0]->clone(ctx
, NULL
));
1513 (void)do_assignment(instructions
, state
,
1514 this->subexpressions
[0]->non_lvalue_description
,
1515 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1516 this->subexpressions
[0]->get_location());
1518 error_emitted
= op
[0]->type
->is_error();
1522 case ast_field_selection
:
1523 result
= _mesa_ast_field_selection_to_hir(this, instructions
, state
);
1526 case ast_array_index
: {
1527 YYLTYPE index_loc
= subexpressions
[1]->get_location();
1529 op
[0] = subexpressions
[0]->hir(instructions
, state
);
1530 op
[1] = subexpressions
[1]->hir(instructions
, state
);
1532 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1534 ir_rvalue
*const array
= op
[0];
1536 result
= new(ctx
) ir_dereference_array(op
[0], op
[1]);
1538 /* Do not use op[0] after this point. Use array.
1546 if (!array
->type
->is_array()
1547 && !array
->type
->is_matrix()
1548 && !array
->type
->is_vector()) {
1549 _mesa_glsl_error(& index_loc
, state
,
1550 "cannot dereference non-array / non-matrix / "
1552 error_emitted
= true;
1555 if (!op
[1]->type
->is_integer()) {
1556 _mesa_glsl_error(& index_loc
, state
,
1557 "array index must be integer type");
1558 error_emitted
= true;
1559 } else if (!op
[1]->type
->is_scalar()) {
1560 _mesa_glsl_error(& index_loc
, state
,
1561 "array index must be scalar");
1562 error_emitted
= true;
1565 /* If the array index is a constant expression and the array has a
1566 * declared size, ensure that the access is in-bounds. If the array
1567 * index is not a constant expression, ensure that the array has a
1570 ir_constant
*const const_index
= op
[1]->constant_expression_value();
1571 if (const_index
!= NULL
) {
1572 const int idx
= const_index
->value
.i
[0];
1573 const char *type_name
;
1576 if (array
->type
->is_matrix()) {
1577 type_name
= "matrix";
1578 } else if (array
->type
->is_vector()) {
1579 type_name
= "vector";
1581 type_name
= "array";
1584 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec:
1586 * "It is illegal to declare an array with a size, and then
1587 * later (in the same shader) index the same array with an
1588 * integral constant expression greater than or equal to the
1589 * declared size. It is also illegal to index an array with a
1590 * negative constant expression."
1592 if (array
->type
->is_matrix()) {
1593 if (array
->type
->row_type()->vector_elements
<= idx
) {
1594 bound
= array
->type
->row_type()->vector_elements
;
1596 } else if (array
->type
->is_vector()) {
1597 if (array
->type
->vector_elements
<= idx
) {
1598 bound
= array
->type
->vector_elements
;
1601 if ((array
->type
->array_size() > 0)
1602 && (array
->type
->array_size() <= idx
)) {
1603 bound
= array
->type
->array_size();
1608 _mesa_glsl_error(& loc
, state
, "%s index must be < %u",
1610 error_emitted
= true;
1611 } else if (idx
< 0) {
1612 _mesa_glsl_error(& loc
, state
, "%s index must be >= 0",
1614 error_emitted
= true;
1617 if (array
->type
->is_array()) {
1618 /* If the array is a variable dereference, it dereferences the
1619 * whole array, by definition. Use this to get the variable.
1621 * FINISHME: Should some methods for getting / setting / testing
1622 * FINISHME: array access limits be added to ir_dereference?
1624 ir_variable
*const v
= array
->whole_variable_referenced();
1625 if ((v
!= NULL
) && (unsigned(idx
) > v
->max_array_access
)) {
1626 v
->max_array_access
= idx
;
1628 /* Check whether this access will, as a side effect, implicitly
1629 * cause the size of a built-in array to be too large.
1631 if (check_builtin_array_max_size(v
->name
, idx
+1, loc
, state
))
1632 error_emitted
= true;
1635 } else if (array
->type
->array_size() == 0) {
1636 _mesa_glsl_error(&loc
, state
, "unsized array index must be constant");
1638 if (array
->type
->is_array()) {
1639 /* whole_variable_referenced can return NULL if the array is a
1640 * member of a structure. In this case it is safe to not update
1641 * the max_array_access field because it is never used for fields
1644 ir_variable
*v
= array
->whole_variable_referenced();
1646 v
->max_array_access
= array
->type
->array_size() - 1;
1650 /* From page 23 (29 of the PDF) of the GLSL 1.30 spec:
1652 * "Samplers aggregated into arrays within a shader (using square
1653 * brackets [ ]) can only be indexed with integral constant
1654 * expressions [...]."
1656 * This restriction was added in GLSL 1.30. Shaders using earlier version
1657 * of the language should not be rejected by the compiler front-end for
1658 * using this construct. This allows useful things such as using a loop
1659 * counter as the index to an array of samplers. If the loop in unrolled,
1660 * the code should compile correctly. Instead, emit a warning.
1662 if (array
->type
->is_array() &&
1663 array
->type
->element_type()->is_sampler() &&
1664 const_index
== NULL
) {
1666 if (state
->language_version
== 100) {
1667 _mesa_glsl_warning(&loc
, state
,
1668 "sampler arrays indexed with non-constant "
1669 "expressions is optional in GLSL ES 1.00");
1670 } else if (state
->language_version
< 130) {
1671 _mesa_glsl_warning(&loc
, state
,
1672 "sampler arrays indexed with non-constant "
1673 "expressions is forbidden in GLSL 1.30 and "
1676 _mesa_glsl_error(&loc
, state
,
1677 "sampler arrays indexed with non-constant "
1678 "expressions is forbidden in GLSL 1.30 and "
1680 error_emitted
= true;
1685 result
->type
= glsl_type::error_type
;
1690 case ast_function_call
:
1691 /* Should *NEVER* get here. ast_function_call should always be handled
1692 * by ast_function_expression::hir.
1697 case ast_identifier
: {
1698 /* ast_identifier can appear several places in a full abstract syntax
1699 * tree. This particular use must be at location specified in the grammar
1700 * as 'variable_identifier'.
1703 state
->symbols
->get_variable(this->primary_expression
.identifier
);
1705 result
= new(ctx
) ir_dereference_variable(var
);
1710 _mesa_glsl_error(& loc
, state
, "`%s' undeclared",
1711 this->primary_expression
.identifier
);
1713 error_emitted
= true;
1718 case ast_int_constant
:
1719 result
= new(ctx
) ir_constant(this->primary_expression
.int_constant
);
1722 case ast_uint_constant
:
1723 result
= new(ctx
) ir_constant(this->primary_expression
.uint_constant
);
1726 case ast_float_constant
:
1727 result
= new(ctx
) ir_constant(this->primary_expression
.float_constant
);
1730 case ast_bool_constant
:
1731 result
= new(ctx
) ir_constant(bool(this->primary_expression
.bool_constant
));
1734 case ast_sequence
: {
1735 /* It should not be possible to generate a sequence in the AST without
1736 * any expressions in it.
1738 assert(!this->expressions
.is_empty());
1740 /* The r-value of a sequence is the last expression in the sequence. If
1741 * the other expressions in the sequence do not have side-effects (and
1742 * therefore add instructions to the instruction list), they get dropped
1745 exec_node
*previous_tail_pred
= NULL
;
1746 YYLTYPE previous_operand_loc
= loc
;
1748 foreach_list_typed (ast_node
, ast
, link
, &this->expressions
) {
1749 /* If one of the operands of comma operator does not generate any
1750 * code, we want to emit a warning. At each pass through the loop
1751 * previous_tail_pred will point to the last instruction in the
1752 * stream *before* processing the previous operand. Naturally,
1753 * instructions->tail_pred will point to the last instruction in the
1754 * stream *after* processing the previous operand. If the two
1755 * pointers match, then the previous operand had no effect.
1757 * The warning behavior here differs slightly from GCC. GCC will
1758 * only emit a warning if none of the left-hand operands have an
1759 * effect. However, it will emit a warning for each. I believe that
1760 * there are some cases in C (especially with GCC extensions) where
1761 * it is useful to have an intermediate step in a sequence have no
1762 * effect, but I don't think these cases exist in GLSL. Either way,
1763 * it would be a giant hassle to replicate that behavior.
1765 if (previous_tail_pred
== instructions
->tail_pred
) {
1766 _mesa_glsl_warning(&previous_operand_loc
, state
,
1767 "left-hand operand of comma expression has "
1771 /* tail_pred is directly accessed instead of using the get_tail()
1772 * method for performance reasons. get_tail() has extra code to
1773 * return NULL when the list is empty. We don't care about that
1774 * here, so using tail_pred directly is fine.
1776 previous_tail_pred
= instructions
->tail_pred
;
1777 previous_operand_loc
= ast
->get_location();
1779 result
= ast
->hir(instructions
, state
);
1782 /* Any errors should have already been emitted in the loop above.
1784 error_emitted
= true;
1788 type
= NULL
; /* use result->type, not type. */
1789 assert(result
!= NULL
);
1791 if (result
->type
->is_error() && !error_emitted
)
1792 _mesa_glsl_error(& loc
, state
, "type mismatch");
1799 ast_expression_statement::hir(exec_list
*instructions
,
1800 struct _mesa_glsl_parse_state
*state
)
1802 /* It is possible to have expression statements that don't have an
1803 * expression. This is the solitary semicolon:
1805 * for (i = 0; i < 5; i++)
1808 * In this case the expression will be NULL. Test for NULL and don't do
1809 * anything in that case.
1811 if (expression
!= NULL
)
1812 expression
->hir(instructions
, state
);
1814 /* Statements do not have r-values.
1821 ast_compound_statement::hir(exec_list
*instructions
,
1822 struct _mesa_glsl_parse_state
*state
)
1825 state
->symbols
->push_scope();
1827 foreach_list_typed (ast_node
, ast
, link
, &this->statements
)
1828 ast
->hir(instructions
, state
);
1831 state
->symbols
->pop_scope();
1833 /* Compound statements do not have r-values.
1839 static const glsl_type
*
1840 process_array_type(YYLTYPE
*loc
, const glsl_type
*base
, ast_node
*array_size
,
1841 struct _mesa_glsl_parse_state
*state
)
1843 unsigned length
= 0;
1845 /* From page 19 (page 25) of the GLSL 1.20 spec:
1847 * "Only one-dimensional arrays may be declared."
1849 if (base
->is_array()) {
1850 _mesa_glsl_error(loc
, state
,
1851 "invalid array of `%s' (only one-dimensional arrays "
1854 return glsl_type::error_type
;
1857 if (array_size
!= NULL
) {
1858 exec_list dummy_instructions
;
1859 ir_rvalue
*const ir
= array_size
->hir(& dummy_instructions
, state
);
1860 YYLTYPE loc
= array_size
->get_location();
1863 if (!ir
->type
->is_integer()) {
1864 _mesa_glsl_error(& loc
, state
, "array size must be integer type");
1865 } else if (!ir
->type
->is_scalar()) {
1866 _mesa_glsl_error(& loc
, state
, "array size must be scalar type");
1868 ir_constant
*const size
= ir
->constant_expression_value();
1871 _mesa_glsl_error(& loc
, state
, "array size must be a "
1872 "constant valued expression");
1873 } else if (size
->value
.i
[0] <= 0) {
1874 _mesa_glsl_error(& loc
, state
, "array size must be > 0");
1876 assert(size
->type
== ir
->type
);
1877 length
= size
->value
.u
[0];
1879 /* If the array size is const (and we've verified that
1880 * it is) then no instructions should have been emitted
1881 * when we converted it to HIR. If they were emitted,
1882 * then either the array size isn't const after all, or
1883 * we are emitting unnecessary instructions.
1885 assert(dummy_instructions
.is_empty());
1889 } else if (state
->es_shader
) {
1890 /* Section 10.17 of the GLSL ES 1.00 specification states that unsized
1891 * array declarations have been removed from the language.
1893 _mesa_glsl_error(loc
, state
, "unsized array declarations are not "
1894 "allowed in GLSL ES 1.00.");
1897 return glsl_type::get_array_instance(base
, length
);
1902 ast_type_specifier::glsl_type(const char **name
,
1903 struct _mesa_glsl_parse_state
*state
) const
1905 const struct glsl_type
*type
;
1907 type
= state
->symbols
->get_type(this->type_name
);
1908 *name
= this->type_name
;
1910 if (this->is_array
) {
1911 YYLTYPE loc
= this->get_location();
1912 type
= process_array_type(&loc
, type
, this->array_size
, state
);
1920 apply_type_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
1922 struct _mesa_glsl_parse_state
*state
,
1925 if (qual
->flags
.q
.invariant
) {
1927 _mesa_glsl_error(loc
, state
,
1928 "variable `%s' may not be redeclared "
1929 "`invariant' after being used",
1936 if (qual
->flags
.q
.constant
|| qual
->flags
.q
.attribute
1937 || qual
->flags
.q
.uniform
1938 || (qual
->flags
.q
.varying
&& (state
->target
== fragment_shader
)))
1941 if (qual
->flags
.q
.centroid
)
1944 if (qual
->flags
.q
.attribute
&& state
->target
!= vertex_shader
) {
1945 var
->type
= glsl_type::error_type
;
1946 _mesa_glsl_error(loc
, state
,
1947 "`attribute' variables may not be declared in the "
1949 _mesa_glsl_shader_target_name(state
->target
));
1952 /* From page 25 (page 31 of the PDF) of the GLSL 1.10 spec:
1954 * "The varying qualifier can be used only with the data types
1955 * float, vec2, vec3, vec4, mat2, mat3, and mat4, or arrays of
1958 if (qual
->flags
.q
.varying
) {
1959 const glsl_type
*non_array_type
;
1961 if (var
->type
&& var
->type
->is_array())
1962 non_array_type
= var
->type
->fields
.array
;
1964 non_array_type
= var
->type
;
1966 if (non_array_type
&& non_array_type
->base_type
!= GLSL_TYPE_FLOAT
) {
1967 var
->type
= glsl_type::error_type
;
1968 _mesa_glsl_error(loc
, state
,
1969 "varying variables must be of base type float");
1973 /* If there is no qualifier that changes the mode of the variable, leave
1974 * the setting alone.
1976 if (qual
->flags
.q
.in
&& qual
->flags
.q
.out
)
1977 var
->mode
= ir_var_inout
;
1978 else if (qual
->flags
.q
.attribute
|| qual
->flags
.q
.in
1979 || (qual
->flags
.q
.varying
&& (state
->target
== fragment_shader
)))
1980 var
->mode
= ir_var_in
;
1981 else if (qual
->flags
.q
.out
1982 || (qual
->flags
.q
.varying
&& (state
->target
== vertex_shader
)))
1983 var
->mode
= ir_var_out
;
1984 else if (qual
->flags
.q
.uniform
)
1985 var
->mode
= ir_var_uniform
;
1987 if (state
->all_invariant
&& (state
->current_function
== NULL
)) {
1988 switch (state
->target
) {
1990 if (var
->mode
== ir_var_out
)
1991 var
->invariant
= true;
1993 case geometry_shader
:
1994 if ((var
->mode
== ir_var_in
) || (var
->mode
== ir_var_out
))
1995 var
->invariant
= true;
1997 case fragment_shader
:
1998 if (var
->mode
== ir_var_in
)
1999 var
->invariant
= true;
2004 if (qual
->flags
.q
.flat
)
2005 var
->interpolation
= INTERP_QUALIFIER_FLAT
;
2006 else if (qual
->flags
.q
.noperspective
)
2007 var
->interpolation
= INTERP_QUALIFIER_NOPERSPECTIVE
;
2008 else if (qual
->flags
.q
.smooth
)
2009 var
->interpolation
= INTERP_QUALIFIER_SMOOTH
;
2011 var
->interpolation
= INTERP_QUALIFIER_NONE
;
2013 if (var
->interpolation
!= INTERP_QUALIFIER_NONE
&&
2014 !(state
->target
== vertex_shader
&& var
->mode
== ir_var_out
) &&
2015 !(state
->target
== fragment_shader
&& var
->mode
== ir_var_in
)) {
2016 const char *qual_string
= NULL
;
2017 switch (var
->interpolation
) {
2018 case INTERP_QUALIFIER_FLAT
:
2019 qual_string
= "flat";
2021 case INTERP_QUALIFIER_NOPERSPECTIVE
:
2022 qual_string
= "noperspective";
2024 case INTERP_QUALIFIER_SMOOTH
:
2025 qual_string
= "smooth";
2029 _mesa_glsl_error(loc
, state
,
2030 "interpolation qualifier `%s' can only be applied to "
2031 "vertex shader outputs and fragment shader inputs.",
2036 var
->pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
2037 var
->origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
2038 if ((qual
->flags
.q
.origin_upper_left
|| qual
->flags
.q
.pixel_center_integer
)
2039 && (strcmp(var
->name
, "gl_FragCoord") != 0)) {
2040 const char *const qual_string
= (qual
->flags
.q
.origin_upper_left
)
2041 ? "origin_upper_left" : "pixel_center_integer";
2043 _mesa_glsl_error(loc
, state
,
2044 "layout qualifier `%s' can only be applied to "
2045 "fragment shader input `gl_FragCoord'",
2049 if (qual
->flags
.q
.explicit_location
) {
2050 const bool global_scope
= (state
->current_function
== NULL
);
2052 const char *string
= "";
2054 /* In the vertex shader only shader inputs can be given explicit
2057 * In the fragment shader only shader outputs can be given explicit
2060 switch (state
->target
) {
2062 if (!global_scope
|| (var
->mode
!= ir_var_in
)) {
2068 case geometry_shader
:
2069 _mesa_glsl_error(loc
, state
,
2070 "geometry shader variables cannot be given "
2071 "explicit locations\n");
2074 case fragment_shader
:
2075 if (!global_scope
|| (var
->mode
!= ir_var_out
)) {
2083 _mesa_glsl_error(loc
, state
,
2084 "only %s shader %s variables can be given an "
2085 "explicit location\n",
2086 _mesa_glsl_shader_target_name(state
->target
),
2089 var
->explicit_location
= true;
2091 /* This bit of silliness is needed because invalid explicit locations
2092 * are supposed to be flagged during linking. Small negative values
2093 * biased by VERT_ATTRIB_GENERIC0 or FRAG_RESULT_DATA0 could alias
2094 * built-in values (e.g., -16+VERT_ATTRIB_GENERIC0 = VERT_ATTRIB_POS).
2095 * The linker needs to be able to differentiate these cases. This
2096 * ensures that negative values stay negative.
2098 if (qual
->location
>= 0) {
2099 var
->location
= (state
->target
== vertex_shader
)
2100 ? (qual
->location
+ VERT_ATTRIB_GENERIC0
)
2101 : (qual
->location
+ FRAG_RESULT_DATA0
);
2103 var
->location
= qual
->location
;
2108 /* Does the declaration use the 'layout' keyword?
2110 const bool uses_layout
= qual
->flags
.q
.pixel_center_integer
2111 || qual
->flags
.q
.origin_upper_left
2112 || qual
->flags
.q
.explicit_location
;
2114 /* Does the declaration use the deprecated 'attribute' or 'varying'
2117 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
2118 || qual
->flags
.q
.varying
;
2120 /* Is the 'layout' keyword used with parameters that allow relaxed checking.
2121 * Many implementations of GL_ARB_fragment_coord_conventions_enable and some
2122 * implementations (only Mesa?) GL_ARB_explicit_attrib_location_enable
2123 * allowed the layout qualifier to be used with 'varying' and 'attribute'.
2124 * These extensions and all following extensions that add the 'layout'
2125 * keyword have been modified to require the use of 'in' or 'out'.
2127 * The following extension do not allow the deprecated keywords:
2129 * GL_AMD_conservative_depth
2130 * GL_ARB_conservative_depth
2131 * GL_ARB_gpu_shader5
2132 * GL_ARB_separate_shader_objects
2133 * GL_ARB_tesselation_shader
2134 * GL_ARB_transform_feedback3
2135 * GL_ARB_uniform_buffer_object
2137 * It is unknown whether GL_EXT_shader_image_load_store or GL_NV_gpu_shader5
2138 * allow layout with the deprecated keywords.
2140 const bool relaxed_layout_qualifier_checking
=
2141 state
->ARB_fragment_coord_conventions_enable
;
2143 if (uses_layout
&& uses_deprecated_qualifier
) {
2144 if (relaxed_layout_qualifier_checking
) {
2145 _mesa_glsl_warning(loc
, state
,
2146 "`layout' qualifier may not be used with "
2147 "`attribute' or `varying'");
2149 _mesa_glsl_error(loc
, state
,
2150 "`layout' qualifier may not be used with "
2151 "`attribute' or `varying'");
2155 /* Layout qualifiers for gl_FragDepth, which are enabled by extension
2156 * AMD_conservative_depth.
2158 int depth_layout_count
= qual
->flags
.q
.depth_any
2159 + qual
->flags
.q
.depth_greater
2160 + qual
->flags
.q
.depth_less
2161 + qual
->flags
.q
.depth_unchanged
;
2162 if (depth_layout_count
> 0
2163 && !state
->AMD_conservative_depth_enable
2164 && !state
->ARB_conservative_depth_enable
) {
2165 _mesa_glsl_error(loc
, state
,
2166 "extension GL_AMD_conservative_depth or "
2167 "GL_ARB_conservative_depth must be enabled "
2168 "to use depth layout qualifiers");
2169 } else if (depth_layout_count
> 0
2170 && strcmp(var
->name
, "gl_FragDepth") != 0) {
2171 _mesa_glsl_error(loc
, state
,
2172 "depth layout qualifiers can be applied only to "
2174 } else if (depth_layout_count
> 1
2175 && strcmp(var
->name
, "gl_FragDepth") == 0) {
2176 _mesa_glsl_error(loc
, state
,
2177 "at most one depth layout qualifier can be applied to "
2180 if (qual
->flags
.q
.depth_any
)
2181 var
->depth_layout
= ir_depth_layout_any
;
2182 else if (qual
->flags
.q
.depth_greater
)
2183 var
->depth_layout
= ir_depth_layout_greater
;
2184 else if (qual
->flags
.q
.depth_less
)
2185 var
->depth_layout
= ir_depth_layout_less
;
2186 else if (qual
->flags
.q
.depth_unchanged
)
2187 var
->depth_layout
= ir_depth_layout_unchanged
;
2189 var
->depth_layout
= ir_depth_layout_none
;
2193 * Get the variable that is being redeclared by this declaration
2195 * Semantic checks to verify the validity of the redeclaration are also
2196 * performed. If semantic checks fail, compilation error will be emitted via
2197 * \c _mesa_glsl_error, but a non-\c NULL pointer will still be returned.
2200 * A pointer to an existing variable in the current scope if the declaration
2201 * is a redeclaration, \c NULL otherwise.
2204 get_variable_being_redeclared(ir_variable
*var
, ast_declaration
*decl
,
2205 struct _mesa_glsl_parse_state
*state
)
2207 /* Check if this declaration is actually a re-declaration, either to
2208 * resize an array or add qualifiers to an existing variable.
2210 * This is allowed for variables in the current scope, or when at
2211 * global scope (for built-ins in the implicit outer scope).
2213 ir_variable
*earlier
= state
->symbols
->get_variable(decl
->identifier
);
2214 if (earlier
== NULL
||
2215 (state
->current_function
!= NULL
&&
2216 !state
->symbols
->name_declared_this_scope(decl
->identifier
))) {
2221 YYLTYPE loc
= decl
->get_location();
2223 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec,
2225 * "It is legal to declare an array without a size and then
2226 * later re-declare the same name as an array of the same
2227 * type and specify a size."
2229 if ((earlier
->type
->array_size() == 0)
2230 && var
->type
->is_array()
2231 && (var
->type
->element_type() == earlier
->type
->element_type())) {
2232 /* FINISHME: This doesn't match the qualifiers on the two
2233 * FINISHME: declarations. It's not 100% clear whether this is
2234 * FINISHME: required or not.
2237 const unsigned size
= unsigned(var
->type
->array_size());
2238 check_builtin_array_max_size(var
->name
, size
, loc
, state
);
2239 if ((size
> 0) && (size
<= earlier
->max_array_access
)) {
2240 _mesa_glsl_error(& loc
, state
, "array size must be > %u due to "
2242 earlier
->max_array_access
);
2245 earlier
->type
= var
->type
;
2248 } else if (state
->ARB_fragment_coord_conventions_enable
2249 && strcmp(var
->name
, "gl_FragCoord") == 0
2250 && earlier
->type
== var
->type
2251 && earlier
->mode
== var
->mode
) {
2252 /* Allow redeclaration of gl_FragCoord for ARB_fcc layout
2255 earlier
->origin_upper_left
= var
->origin_upper_left
;
2256 earlier
->pixel_center_integer
= var
->pixel_center_integer
;
2258 /* According to section 4.3.7 of the GLSL 1.30 spec,
2259 * the following built-in varaibles can be redeclared with an
2260 * interpolation qualifier:
2263 * * gl_FrontSecondaryColor
2264 * * gl_BackSecondaryColor
2266 * * gl_SecondaryColor
2268 } else if (state
->language_version
>= 130
2269 && (strcmp(var
->name
, "gl_FrontColor") == 0
2270 || strcmp(var
->name
, "gl_BackColor") == 0
2271 || strcmp(var
->name
, "gl_FrontSecondaryColor") == 0
2272 || strcmp(var
->name
, "gl_BackSecondaryColor") == 0
2273 || strcmp(var
->name
, "gl_Color") == 0
2274 || strcmp(var
->name
, "gl_SecondaryColor") == 0)
2275 && earlier
->type
== var
->type
2276 && earlier
->mode
== var
->mode
) {
2277 earlier
->interpolation
= var
->interpolation
;
2279 /* Layout qualifiers for gl_FragDepth. */
2280 } else if ((state
->AMD_conservative_depth_enable
||
2281 state
->ARB_conservative_depth_enable
)
2282 && strcmp(var
->name
, "gl_FragDepth") == 0
2283 && earlier
->type
== var
->type
2284 && earlier
->mode
== var
->mode
) {
2286 /** From the AMD_conservative_depth spec:
2287 * Within any shader, the first redeclarations of gl_FragDepth
2288 * must appear before any use of gl_FragDepth.
2290 if (earlier
->used
) {
2291 _mesa_glsl_error(&loc
, state
,
2292 "the first redeclaration of gl_FragDepth "
2293 "must appear before any use of gl_FragDepth");
2296 /* Prevent inconsistent redeclaration of depth layout qualifier. */
2297 if (earlier
->depth_layout
!= ir_depth_layout_none
2298 && earlier
->depth_layout
!= var
->depth_layout
) {
2299 _mesa_glsl_error(&loc
, state
,
2300 "gl_FragDepth: depth layout is declared here "
2301 "as '%s, but it was previously declared as "
2303 depth_layout_string(var
->depth_layout
),
2304 depth_layout_string(earlier
->depth_layout
));
2307 earlier
->depth_layout
= var
->depth_layout
;
2310 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", decl
->identifier
);
2317 * Generate the IR for an initializer in a variable declaration
2320 process_initializer(ir_variable
*var
, ast_declaration
*decl
,
2321 ast_fully_specified_type
*type
,
2322 exec_list
*initializer_instructions
,
2323 struct _mesa_glsl_parse_state
*state
)
2325 ir_rvalue
*result
= NULL
;
2327 YYLTYPE initializer_loc
= decl
->initializer
->get_location();
2329 /* From page 24 (page 30 of the PDF) of the GLSL 1.10 spec:
2331 * "All uniform variables are read-only and are initialized either
2332 * directly by an application via API commands, or indirectly by
2335 if ((state
->language_version
<= 110)
2336 && (var
->mode
== ir_var_uniform
)) {
2337 _mesa_glsl_error(& initializer_loc
, state
,
2338 "cannot initialize uniforms in GLSL 1.10");
2341 if (var
->type
->is_sampler()) {
2342 _mesa_glsl_error(& initializer_loc
, state
,
2343 "cannot initialize samplers");
2346 if ((var
->mode
== ir_var_in
) && (state
->current_function
== NULL
)) {
2347 _mesa_glsl_error(& initializer_loc
, state
,
2348 "cannot initialize %s shader input / %s",
2349 _mesa_glsl_shader_target_name(state
->target
),
2350 (state
->target
== vertex_shader
)
2351 ? "attribute" : "varying");
2354 ir_dereference
*const lhs
= new(state
) ir_dereference_variable(var
);
2355 ir_rvalue
*rhs
= decl
->initializer
->hir(initializer_instructions
,
2358 /* Calculate the constant value if this is a const or uniform
2361 if (type
->qualifier
.flags
.q
.constant
2362 || type
->qualifier
.flags
.q
.uniform
) {
2363 ir_rvalue
*new_rhs
= validate_assignment(state
, var
->type
, rhs
, true);
2364 if (new_rhs
!= NULL
) {
2367 ir_constant
*constant_value
= rhs
->constant_expression_value();
2368 if (!constant_value
) {
2369 _mesa_glsl_error(& initializer_loc
, state
,
2370 "initializer of %s variable `%s' must be a "
2371 "constant expression",
2372 (type
->qualifier
.flags
.q
.constant
)
2373 ? "const" : "uniform",
2375 if (var
->type
->is_numeric()) {
2376 /* Reduce cascading errors. */
2377 var
->constant_value
= ir_constant::zero(state
, var
->type
);
2380 rhs
= constant_value
;
2381 var
->constant_value
= constant_value
;
2384 _mesa_glsl_error(&initializer_loc
, state
,
2385 "initializer of type %s cannot be assigned to "
2386 "variable of type %s",
2387 rhs
->type
->name
, var
->type
->name
);
2388 if (var
->type
->is_numeric()) {
2389 /* Reduce cascading errors. */
2390 var
->constant_value
= ir_constant::zero(state
, var
->type
);
2395 if (rhs
&& !rhs
->type
->is_error()) {
2396 bool temp
= var
->read_only
;
2397 if (type
->qualifier
.flags
.q
.constant
)
2398 var
->read_only
= false;
2400 /* Never emit code to initialize a uniform.
2402 const glsl_type
*initializer_type
;
2403 if (!type
->qualifier
.flags
.q
.uniform
) {
2404 result
= do_assignment(initializer_instructions
, state
,
2407 type
->get_location());
2408 initializer_type
= result
->type
;
2410 initializer_type
= rhs
->type
;
2412 var
->constant_initializer
= rhs
->constant_expression_value();
2413 var
->has_initializer
= true;
2415 /* If the declared variable is an unsized array, it must inherrit
2416 * its full type from the initializer. A declaration such as
2418 * uniform float a[] = float[](1.0, 2.0, 3.0, 3.0);
2422 * uniform float a[4] = float[](1.0, 2.0, 3.0, 3.0);
2424 * The assignment generated in the if-statement (below) will also
2425 * automatically handle this case for non-uniforms.
2427 * If the declared variable is not an array, the types must
2428 * already match exactly. As a result, the type assignment
2429 * here can be done unconditionally. For non-uniforms the call
2430 * to do_assignment can change the type of the initializer (via
2431 * the implicit conversion rules). For uniforms the initializer
2432 * must be a constant expression, and the type of that expression
2433 * was validated above.
2435 var
->type
= initializer_type
;
2437 var
->read_only
= temp
;
2444 ast_declarator_list::hir(exec_list
*instructions
,
2445 struct _mesa_glsl_parse_state
*state
)
2448 const struct glsl_type
*decl_type
;
2449 const char *type_name
= NULL
;
2450 ir_rvalue
*result
= NULL
;
2451 YYLTYPE loc
= this->get_location();
2453 /* From page 46 (page 52 of the PDF) of the GLSL 1.50 spec:
2455 * "To ensure that a particular output variable is invariant, it is
2456 * necessary to use the invariant qualifier. It can either be used to
2457 * qualify a previously declared variable as being invariant
2459 * invariant gl_Position; // make existing gl_Position be invariant"
2461 * In these cases the parser will set the 'invariant' flag in the declarator
2462 * list, and the type will be NULL.
2464 if (this->invariant
) {
2465 assert(this->type
== NULL
);
2467 if (state
->current_function
!= NULL
) {
2468 _mesa_glsl_error(& loc
, state
,
2469 "All uses of `invariant' keyword must be at global "
2473 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
2474 assert(!decl
->is_array
);
2475 assert(decl
->array_size
== NULL
);
2476 assert(decl
->initializer
== NULL
);
2478 ir_variable
*const earlier
=
2479 state
->symbols
->get_variable(decl
->identifier
);
2480 if (earlier
== NULL
) {
2481 _mesa_glsl_error(& loc
, state
,
2482 "Undeclared variable `%s' cannot be marked "
2483 "invariant\n", decl
->identifier
);
2484 } else if ((state
->target
== vertex_shader
)
2485 && (earlier
->mode
!= ir_var_out
)) {
2486 _mesa_glsl_error(& loc
, state
,
2487 "`%s' cannot be marked invariant, vertex shader "
2488 "outputs only\n", decl
->identifier
);
2489 } else if ((state
->target
== fragment_shader
)
2490 && (earlier
->mode
!= ir_var_in
)) {
2491 _mesa_glsl_error(& loc
, state
,
2492 "`%s' cannot be marked invariant, fragment shader "
2493 "inputs only\n", decl
->identifier
);
2494 } else if (earlier
->used
) {
2495 _mesa_glsl_error(& loc
, state
,
2496 "variable `%s' may not be redeclared "
2497 "`invariant' after being used",
2500 earlier
->invariant
= true;
2504 /* Invariant redeclarations do not have r-values.
2509 assert(this->type
!= NULL
);
2510 assert(!this->invariant
);
2512 /* The type specifier may contain a structure definition. Process that
2513 * before any of the variable declarations.
2515 (void) this->type
->specifier
->hir(instructions
, state
);
2517 decl_type
= this->type
->specifier
->glsl_type(& type_name
, state
);
2518 if (this->declarations
.is_empty()) {
2519 /* If there is no structure involved in the program text, there are two
2520 * possible scenarios:
2522 * - The program text contained something like 'vec4;'. This is an
2523 * empty declaration. It is valid but weird. Emit a warning.
2525 * - The program text contained something like 'S;' and 'S' is not the
2526 * name of a known structure type. This is both invalid and weird.
2529 * Note that if decl_type is NULL and there is a structure involved,
2530 * there must have been some sort of error with the structure. In this
2531 * case we assume that an error was already generated on this line of
2532 * code for the structure. There is no need to generate an additional,
2535 assert(this->type
->specifier
->structure
== NULL
|| decl_type
!= NULL
2537 if (this->type
->specifier
->structure
== NULL
) {
2538 if (decl_type
!= NULL
) {
2539 _mesa_glsl_warning(&loc
, state
, "empty declaration");
2541 _mesa_glsl_error(&loc
, state
,
2542 "invalid type `%s' in empty declaration",
2548 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
2549 const struct glsl_type
*var_type
;
2552 /* FINISHME: Emit a warning if a variable declaration shadows a
2553 * FINISHME: declaration at a higher scope.
2556 if ((decl_type
== NULL
) || decl_type
->is_void()) {
2557 if (type_name
!= NULL
) {
2558 _mesa_glsl_error(& loc
, state
,
2559 "invalid type `%s' in declaration of `%s'",
2560 type_name
, decl
->identifier
);
2562 _mesa_glsl_error(& loc
, state
,
2563 "invalid type in declaration of `%s'",
2569 if (decl
->is_array
) {
2570 var_type
= process_array_type(&loc
, decl_type
, decl
->array_size
,
2572 if (var_type
->is_error())
2575 var_type
= decl_type
;
2578 var
= new(ctx
) ir_variable(var_type
, decl
->identifier
, ir_var_auto
);
2580 /* From page 22 (page 28 of the PDF) of the GLSL 1.10 specification;
2582 * "Global variables can only use the qualifiers const,
2583 * attribute, uni form, or varying. Only one may be
2586 * Local variables can only use the qualifier const."
2588 * This is relaxed in GLSL 1.30. It is also relaxed by any extension
2589 * that adds the 'layout' keyword.
2591 if ((state
->language_version
< 130)
2592 && !state
->ARB_explicit_attrib_location_enable
2593 && !state
->ARB_fragment_coord_conventions_enable
) {
2594 if (this->type
->qualifier
.flags
.q
.out
) {
2595 _mesa_glsl_error(& loc
, state
,
2596 "`out' qualifier in declaration of `%s' "
2597 "only valid for function parameters in %s.",
2598 decl
->identifier
, state
->version_string
);
2600 if (this->type
->qualifier
.flags
.q
.in
) {
2601 _mesa_glsl_error(& loc
, state
,
2602 "`in' qualifier in declaration of `%s' "
2603 "only valid for function parameters in %s.",
2604 decl
->identifier
, state
->version_string
);
2606 /* FINISHME: Test for other invalid qualifiers. */
2609 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
,
2612 if (this->type
->qualifier
.flags
.q
.invariant
) {
2613 if ((state
->target
== vertex_shader
) && !(var
->mode
== ir_var_out
||
2614 var
->mode
== ir_var_inout
)) {
2615 /* FINISHME: Note that this doesn't work for invariant on
2616 * a function signature outval
2618 _mesa_glsl_error(& loc
, state
,
2619 "`%s' cannot be marked invariant, vertex shader "
2620 "outputs only\n", var
->name
);
2621 } else if ((state
->target
== fragment_shader
) &&
2622 !(var
->mode
== ir_var_in
|| var
->mode
== ir_var_inout
)) {
2623 /* FINISHME: Note that this doesn't work for invariant on
2624 * a function signature inval
2626 _mesa_glsl_error(& loc
, state
,
2627 "`%s' cannot be marked invariant, fragment shader "
2628 "inputs only\n", var
->name
);
2632 if (state
->current_function
!= NULL
) {
2633 const char *mode
= NULL
;
2634 const char *extra
= "";
2636 /* There is no need to check for 'inout' here because the parser will
2637 * only allow that in function parameter lists.
2639 if (this->type
->qualifier
.flags
.q
.attribute
) {
2641 } else if (this->type
->qualifier
.flags
.q
.uniform
) {
2643 } else if (this->type
->qualifier
.flags
.q
.varying
) {
2645 } else if (this->type
->qualifier
.flags
.q
.in
) {
2647 extra
= " or in function parameter list";
2648 } else if (this->type
->qualifier
.flags
.q
.out
) {
2650 extra
= " or in function parameter list";
2654 _mesa_glsl_error(& loc
, state
,
2655 "%s variable `%s' must be declared at "
2657 mode
, var
->name
, extra
);
2659 } else if (var
->mode
== ir_var_in
) {
2660 var
->read_only
= true;
2662 if (state
->target
== vertex_shader
) {
2663 bool error_emitted
= false;
2665 /* From page 31 (page 37 of the PDF) of the GLSL 1.50 spec:
2667 * "Vertex shader inputs can only be float, floating-point
2668 * vectors, matrices, signed and unsigned integers and integer
2669 * vectors. Vertex shader inputs can also form arrays of these
2670 * types, but not structures."
2672 * From page 31 (page 27 of the PDF) of the GLSL 1.30 spec:
2674 * "Vertex shader inputs can only be float, floating-point
2675 * vectors, matrices, signed and unsigned integers and integer
2676 * vectors. They cannot be arrays or structures."
2678 * From page 23 (page 29 of the PDF) of the GLSL 1.20 spec:
2680 * "The attribute qualifier can be used only with float,
2681 * floating-point vectors, and matrices. Attribute variables
2682 * cannot be declared as arrays or structures."
2684 const glsl_type
*check_type
= var
->type
->is_array()
2685 ? var
->type
->fields
.array
: var
->type
;
2687 switch (check_type
->base_type
) {
2688 case GLSL_TYPE_FLOAT
:
2690 case GLSL_TYPE_UINT
:
2692 if (state
->language_version
> 120)
2696 _mesa_glsl_error(& loc
, state
,
2697 "vertex shader input / attribute cannot have "
2699 var
->type
->is_array() ? "array of " : "",
2701 error_emitted
= true;
2704 if (!error_emitted
&& (state
->language_version
<= 130)
2705 && var
->type
->is_array()) {
2706 _mesa_glsl_error(& loc
, state
,
2707 "vertex shader input / attribute cannot have "
2709 error_emitted
= true;
2714 /* Integer vertex outputs must be qualified with 'flat'.
2716 * From section 4.3.6 of the GLSL 1.30 spec:
2717 * "If a vertex output is a signed or unsigned integer or integer
2718 * vector, then it must be qualified with the interpolation qualifier
2721 if (state
->language_version
>= 130
2722 && state
->target
== vertex_shader
2723 && state
->current_function
== NULL
2724 && var
->type
->is_integer()
2725 && var
->mode
== ir_var_out
2726 && var
->interpolation
!= INTERP_QUALIFIER_FLAT
) {
2728 _mesa_glsl_error(&loc
, state
, "If a vertex output is an integer, "
2729 "then it must be qualified with 'flat'");
2733 /* Interpolation qualifiers cannot be applied to 'centroid' and
2734 * 'centroid varying'.
2736 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
2737 * "interpolation qualifiers may only precede the qualifiers in,
2738 * centroid in, out, or centroid out in a declaration. They do not apply
2739 * to the deprecated storage qualifiers varying or centroid varying."
2741 if (state
->language_version
>= 130
2742 && this->type
->qualifier
.has_interpolation()
2743 && this->type
->qualifier
.flags
.q
.varying
) {
2745 const char *i
= this->type
->qualifier
.interpolation_string();
2748 if (this->type
->qualifier
.flags
.q
.centroid
)
2749 s
= "centroid varying";
2753 _mesa_glsl_error(&loc
, state
,
2754 "qualifier '%s' cannot be applied to the "
2755 "deprecated storage qualifier '%s'", i
, s
);
2759 /* Interpolation qualifiers can only apply to vertex shader outputs and
2760 * fragment shader inputs.
2762 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
2763 * "Outputs from a vertex shader (out) and inputs to a fragment
2764 * shader (in) can be further qualified with one or more of these
2765 * interpolation qualifiers"
2767 if (state
->language_version
>= 130
2768 && this->type
->qualifier
.has_interpolation()) {
2770 const char *i
= this->type
->qualifier
.interpolation_string();
2773 switch (state
->target
) {
2775 if (this->type
->qualifier
.flags
.q
.in
) {
2776 _mesa_glsl_error(&loc
, state
,
2777 "qualifier '%s' cannot be applied to vertex "
2778 "shader inputs", i
);
2781 case fragment_shader
:
2782 if (this->type
->qualifier
.flags
.q
.out
) {
2783 _mesa_glsl_error(&loc
, state
,
2784 "qualifier '%s' cannot be applied to fragment "
2785 "shader outputs", i
);
2794 /* From section 4.3.4 of the GLSL 1.30 spec:
2795 * "It is an error to use centroid in in a vertex shader."
2797 if (state
->language_version
>= 130
2798 && this->type
->qualifier
.flags
.q
.centroid
2799 && this->type
->qualifier
.flags
.q
.in
2800 && state
->target
== vertex_shader
) {
2802 _mesa_glsl_error(&loc
, state
,
2803 "'centroid in' cannot be used in a vertex shader");
2807 /* Precision qualifiers exists only in GLSL versions 1.00 and >= 1.30.
2809 if (this->type
->specifier
->precision
!= ast_precision_none
2810 && state
->language_version
!= 100
2811 && state
->language_version
< 130) {
2813 _mesa_glsl_error(&loc
, state
,
2814 "precision qualifiers are supported only in GLSL ES "
2815 "1.00, and GLSL 1.30 and later");
2819 /* Precision qualifiers only apply to floating point and integer types.
2821 * From section 4.5.2 of the GLSL 1.30 spec:
2822 * "Any floating point or any integer declaration can have the type
2823 * preceded by one of these precision qualifiers [...] Literal
2824 * constants do not have precision qualifiers. Neither do Boolean
2827 * In GLSL ES, sampler types are also allowed.
2829 * From page 87 of the GLSL ES spec:
2830 * "RESOLUTION: Allow sampler types to take a precision qualifier."
2832 if (this->type
->specifier
->precision
!= ast_precision_none
2833 && !var
->type
->is_float()
2834 && !var
->type
->is_integer()
2835 && !(var
->type
->is_sampler() && state
->es_shader
)
2836 && !(var
->type
->is_array()
2837 && (var
->type
->fields
.array
->is_float()
2838 || var
->type
->fields
.array
->is_integer()))) {
2840 _mesa_glsl_error(&loc
, state
,
2841 "precision qualifiers apply only to floating point"
2842 "%s types", state
->es_shader
? ", integer, and sampler"
2846 /* From page 17 (page 23 of the PDF) of the GLSL 1.20 spec:
2848 * "[Sampler types] can only be declared as function
2849 * parameters or uniform variables (see Section 4.3.5
2852 if (var_type
->contains_sampler() &&
2853 !this->type
->qualifier
.flags
.q
.uniform
) {
2854 _mesa_glsl_error(&loc
, state
, "samplers must be declared uniform");
2857 /* Process the initializer and add its instructions to a temporary
2858 * list. This list will be added to the instruction stream (below) after
2859 * the declaration is added. This is done because in some cases (such as
2860 * redeclarations) the declaration may not actually be added to the
2861 * instruction stream.
2863 exec_list initializer_instructions
;
2864 ir_variable
*earlier
= get_variable_being_redeclared(var
, decl
, state
);
2866 if (decl
->initializer
!= NULL
) {
2867 result
= process_initializer((earlier
== NULL
) ? var
: earlier
,
2869 &initializer_instructions
, state
);
2872 /* From page 23 (page 29 of the PDF) of the GLSL 1.10 spec:
2874 * "It is an error to write to a const variable outside of
2875 * its declaration, so they must be initialized when
2878 if (this->type
->qualifier
.flags
.q
.constant
&& decl
->initializer
== NULL
) {
2879 _mesa_glsl_error(& loc
, state
,
2880 "const declaration of `%s' must be initialized",
2884 /* If the declaration is not a redeclaration, there are a few additional
2885 * semantic checks that must be applied. In addition, variable that was
2886 * created for the declaration should be added to the IR stream.
2888 if (earlier
== NULL
) {
2889 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
2891 * "Identifiers starting with "gl_" are reserved for use by
2892 * OpenGL, and may not be declared in a shader as either a
2893 * variable or a function."
2895 if (strncmp(decl
->identifier
, "gl_", 3) == 0)
2896 _mesa_glsl_error(& loc
, state
,
2897 "identifier `%s' uses reserved `gl_' prefix",
2899 else if (strstr(decl
->identifier
, "__")) {
2900 /* From page 14 (page 20 of the PDF) of the GLSL 1.10
2903 * "In addition, all identifiers containing two
2904 * consecutive underscores (__) are reserved as
2905 * possible future keywords."
2907 _mesa_glsl_error(& loc
, state
,
2908 "identifier `%s' uses reserved `__' string",
2912 /* Add the variable to the symbol table. Note that the initializer's
2913 * IR was already processed earlier (though it hasn't been emitted
2914 * yet), without the variable in scope.
2916 * This differs from most C-like languages, but it follows the GLSL
2917 * specification. From page 28 (page 34 of the PDF) of the GLSL 1.50
2920 * "Within a declaration, the scope of a name starts immediately
2921 * after the initializer if present or immediately after the name
2922 * being declared if not."
2924 if (!state
->symbols
->add_variable(var
)) {
2925 YYLTYPE loc
= this->get_location();
2926 _mesa_glsl_error(&loc
, state
, "name `%s' already taken in the "
2927 "current scope", decl
->identifier
);
2931 /* Push the variable declaration to the top. It means that all the
2932 * variable declarations will appear in a funny last-to-first order,
2933 * but otherwise we run into trouble if a function is prototyped, a
2934 * global var is decled, then the function is defined with usage of
2935 * the global var. See glslparsertest's CorrectModule.frag.
2937 instructions
->push_head(var
);
2940 instructions
->append_list(&initializer_instructions
);
2944 /* Generally, variable declarations do not have r-values. However,
2945 * one is used for the declaration in
2947 * while (bool b = some_condition()) {
2951 * so we return the rvalue from the last seen declaration here.
2958 ast_parameter_declarator::hir(exec_list
*instructions
,
2959 struct _mesa_glsl_parse_state
*state
)
2962 const struct glsl_type
*type
;
2963 const char *name
= NULL
;
2964 YYLTYPE loc
= this->get_location();
2966 type
= this->type
->specifier
->glsl_type(& name
, state
);
2970 _mesa_glsl_error(& loc
, state
,
2971 "invalid type `%s' in declaration of `%s'",
2972 name
, this->identifier
);
2974 _mesa_glsl_error(& loc
, state
,
2975 "invalid type in declaration of `%s'",
2979 type
= glsl_type::error_type
;
2982 /* From page 62 (page 68 of the PDF) of the GLSL 1.50 spec:
2984 * "Functions that accept no input arguments need not use void in the
2985 * argument list because prototypes (or definitions) are required and
2986 * therefore there is no ambiguity when an empty argument list "( )" is
2987 * declared. The idiom "(void)" as a parameter list is provided for
2990 * Placing this check here prevents a void parameter being set up
2991 * for a function, which avoids tripping up checks for main taking
2992 * parameters and lookups of an unnamed symbol.
2994 if (type
->is_void()) {
2995 if (this->identifier
!= NULL
)
2996 _mesa_glsl_error(& loc
, state
,
2997 "named parameter cannot have type `void'");
3003 if (formal_parameter
&& (this->identifier
== NULL
)) {
3004 _mesa_glsl_error(& loc
, state
, "formal parameter lacks a name");
3008 /* This only handles "vec4 foo[..]". The earlier specifier->glsl_type(...)
3009 * call already handled the "vec4[..] foo" case.
3011 if (this->is_array
) {
3012 type
= process_array_type(&loc
, type
, this->array_size
, state
);
3015 if (!type
->is_error() && type
->array_size() == 0) {
3016 _mesa_glsl_error(&loc
, state
, "arrays passed as parameters must have "
3017 "a declared size.");
3018 type
= glsl_type::error_type
;
3022 ir_variable
*var
= new(ctx
) ir_variable(type
, this->identifier
, ir_var_in
);
3024 /* Apply any specified qualifiers to the parameter declaration. Note that
3025 * for function parameters the default mode is 'in'.
3027 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
, & loc
);
3029 /* From page 17 (page 23 of the PDF) of the GLSL 1.20 spec:
3031 * "Samplers cannot be treated as l-values; hence cannot be used
3032 * as out or inout function parameters, nor can they be assigned
3035 if ((var
->mode
== ir_var_inout
|| var
->mode
== ir_var_out
)
3036 && type
->contains_sampler()) {
3037 _mesa_glsl_error(&loc
, state
, "out and inout parameters cannot contain samplers");
3038 type
= glsl_type::error_type
;
3041 /* From page 39 (page 45 of the PDF) of the GLSL 1.10 spec:
3043 * "When calling a function, expressions that do not evaluate to
3044 * l-values cannot be passed to parameters declared as out or inout."
3046 * From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
3048 * "Other binary or unary expressions, non-dereferenced arrays,
3049 * function names, swizzles with repeated fields, and constants
3050 * cannot be l-values."
3052 * So for GLSL 1.10, passing an array as an out or inout parameter is not
3053 * allowed. This restriction is removed in GLSL 1.20, and in GLSL ES.
3055 if ((var
->mode
== ir_var_inout
|| var
->mode
== ir_var_out
)
3056 && type
->is_array() && state
->language_version
== 110) {
3057 _mesa_glsl_error(&loc
, state
, "Arrays cannot be out or inout parameters in GLSL 1.10");
3058 type
= glsl_type::error_type
;
3061 instructions
->push_tail(var
);
3063 /* Parameter declarations do not have r-values.
3070 ast_parameter_declarator::parameters_to_hir(exec_list
*ast_parameters
,
3072 exec_list
*ir_parameters
,
3073 _mesa_glsl_parse_state
*state
)
3075 ast_parameter_declarator
*void_param
= NULL
;
3078 foreach_list_typed (ast_parameter_declarator
, param
, link
, ast_parameters
) {
3079 param
->formal_parameter
= formal
;
3080 param
->hir(ir_parameters
, state
);
3088 if ((void_param
!= NULL
) && (count
> 1)) {
3089 YYLTYPE loc
= void_param
->get_location();
3091 _mesa_glsl_error(& loc
, state
,
3092 "`void' parameter must be only parameter");
3098 emit_function(_mesa_glsl_parse_state
*state
, ir_function
*f
)
3100 /* IR invariants disallow function declarations or definitions
3101 * nested within other function definitions. But there is no
3102 * requirement about the relative order of function declarations
3103 * and definitions with respect to one another. So simply insert
3104 * the new ir_function block at the end of the toplevel instruction
3107 state
->toplevel_ir
->push_tail(f
);
3112 ast_function::hir(exec_list
*instructions
,
3113 struct _mesa_glsl_parse_state
*state
)
3116 ir_function
*f
= NULL
;
3117 ir_function_signature
*sig
= NULL
;
3118 exec_list hir_parameters
;
3120 const char *const name
= identifier
;
3122 /* New functions are always added to the top-level IR instruction stream,
3123 * so this instruction list pointer is ignored. See also emit_function
3126 (void) instructions
;
3128 /* From page 21 (page 27 of the PDF) of the GLSL 1.20 spec,
3130 * "Function declarations (prototypes) cannot occur inside of functions;
3131 * they must be at global scope, or for the built-in functions, outside
3132 * the global scope."
3134 * From page 27 (page 33 of the PDF) of the GLSL ES 1.00.16 spec,
3136 * "User defined functions may only be defined within the global scope."
3138 * Note that this language does not appear in GLSL 1.10.
3140 if ((state
->current_function
!= NULL
) && (state
->language_version
!= 110)) {
3141 YYLTYPE loc
= this->get_location();
3142 _mesa_glsl_error(&loc
, state
,
3143 "declaration of function `%s' not allowed within "
3144 "function body", name
);
3147 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
3149 * "Identifiers starting with "gl_" are reserved for use by
3150 * OpenGL, and may not be declared in a shader as either a
3151 * variable or a function."
3153 if (strncmp(name
, "gl_", 3) == 0) {
3154 YYLTYPE loc
= this->get_location();
3155 _mesa_glsl_error(&loc
, state
,
3156 "identifier `%s' uses reserved `gl_' prefix", name
);
3159 /* Convert the list of function parameters to HIR now so that they can be
3160 * used below to compare this function's signature with previously seen
3161 * signatures for functions with the same name.
3163 ast_parameter_declarator::parameters_to_hir(& this->parameters
,
3165 & hir_parameters
, state
);
3167 const char *return_type_name
;
3168 const glsl_type
*return_type
=
3169 this->return_type
->specifier
->glsl_type(& return_type_name
, state
);
3172 YYLTYPE loc
= this->get_location();
3173 _mesa_glsl_error(&loc
, state
,
3174 "function `%s' has undeclared return type `%s'",
3175 name
, return_type_name
);
3176 return_type
= glsl_type::error_type
;
3179 /* From page 56 (page 62 of the PDF) of the GLSL 1.30 spec:
3180 * "No qualifier is allowed on the return type of a function."
3182 if (this->return_type
->has_qualifiers()) {
3183 YYLTYPE loc
= this->get_location();
3184 _mesa_glsl_error(& loc
, state
,
3185 "function `%s' return type has qualifiers", name
);
3188 /* From page 17 (page 23 of the PDF) of the GLSL 1.20 spec:
3190 * "[Sampler types] can only be declared as function parameters
3191 * or uniform variables (see Section 4.3.5 "Uniform")".
3193 if (return_type
->contains_sampler()) {
3194 YYLTYPE loc
= this->get_location();
3195 _mesa_glsl_error(&loc
, state
,
3196 "function `%s' return type can't contain a sampler",
3200 /* Verify that this function's signature either doesn't match a previously
3201 * seen signature for a function with the same name, or, if a match is found,
3202 * that the previously seen signature does not have an associated definition.
3204 f
= state
->symbols
->get_function(name
);
3205 if (f
!= NULL
&& (state
->es_shader
|| f
->has_user_signature())) {
3206 sig
= f
->exact_matching_signature(&hir_parameters
);
3208 const char *badvar
= sig
->qualifiers_match(&hir_parameters
);
3209 if (badvar
!= NULL
) {
3210 YYLTYPE loc
= this->get_location();
3212 _mesa_glsl_error(&loc
, state
, "function `%s' parameter `%s' "
3213 "qualifiers don't match prototype", name
, badvar
);
3216 if (sig
->return_type
!= return_type
) {
3217 YYLTYPE loc
= this->get_location();
3219 _mesa_glsl_error(&loc
, state
, "function `%s' return type doesn't "
3220 "match prototype", name
);
3223 if (is_definition
&& sig
->is_defined
) {
3224 YYLTYPE loc
= this->get_location();
3226 _mesa_glsl_error(& loc
, state
, "function `%s' redefined", name
);
3230 f
= new(ctx
) ir_function(name
);
3231 if (!state
->symbols
->add_function(f
)) {
3232 /* This function name shadows a non-function use of the same name. */
3233 YYLTYPE loc
= this->get_location();
3235 _mesa_glsl_error(&loc
, state
, "function name `%s' conflicts with "
3236 "non-function", name
);
3240 emit_function(state
, f
);
3243 /* Verify the return type of main() */
3244 if (strcmp(name
, "main") == 0) {
3245 if (! return_type
->is_void()) {
3246 YYLTYPE loc
= this->get_location();
3248 _mesa_glsl_error(& loc
, state
, "main() must return void");
3251 if (!hir_parameters
.is_empty()) {
3252 YYLTYPE loc
= this->get_location();
3254 _mesa_glsl_error(& loc
, state
, "main() must not take any parameters");
3258 /* Finish storing the information about this new function in its signature.
3261 sig
= new(ctx
) ir_function_signature(return_type
);
3262 f
->add_signature(sig
);
3265 sig
->replace_parameters(&hir_parameters
);
3268 /* Function declarations (prototypes) do not have r-values.
3275 ast_function_definition::hir(exec_list
*instructions
,
3276 struct _mesa_glsl_parse_state
*state
)
3278 prototype
->is_definition
= true;
3279 prototype
->hir(instructions
, state
);
3281 ir_function_signature
*signature
= prototype
->signature
;
3282 if (signature
== NULL
)
3285 assert(state
->current_function
== NULL
);
3286 state
->current_function
= signature
;
3287 state
->found_return
= false;
3289 /* Duplicate parameters declared in the prototype as concrete variables.
3290 * Add these to the symbol table.
3292 state
->symbols
->push_scope();
3293 foreach_iter(exec_list_iterator
, iter
, signature
->parameters
) {
3294 ir_variable
*const var
= ((ir_instruction
*) iter
.get())->as_variable();
3296 assert(var
!= NULL
);
3298 /* The only way a parameter would "exist" is if two parameters have
3301 if (state
->symbols
->name_declared_this_scope(var
->name
)) {
3302 YYLTYPE loc
= this->get_location();
3304 _mesa_glsl_error(& loc
, state
, "parameter `%s' redeclared", var
->name
);
3306 state
->symbols
->add_variable(var
);
3310 /* Convert the body of the function to HIR. */
3311 this->body
->hir(&signature
->body
, state
);
3312 signature
->is_defined
= true;
3314 state
->symbols
->pop_scope();
3316 assert(state
->current_function
== signature
);
3317 state
->current_function
= NULL
;
3319 if (!signature
->return_type
->is_void() && !state
->found_return
) {
3320 YYLTYPE loc
= this->get_location();
3321 _mesa_glsl_error(& loc
, state
, "function `%s' has non-void return type "
3322 "%s, but no return statement",
3323 signature
->function_name(),
3324 signature
->return_type
->name
);
3327 /* Function definitions do not have r-values.
3334 ast_jump_statement::hir(exec_list
*instructions
,
3335 struct _mesa_glsl_parse_state
*state
)
3342 assert(state
->current_function
);
3344 if (opt_return_value
) {
3345 ir_rvalue
*const ret
= opt_return_value
->hir(instructions
, state
);
3347 /* The value of the return type can be NULL if the shader says
3348 * 'return foo();' and foo() is a function that returns void.
3350 * NOTE: The GLSL spec doesn't say that this is an error. The type
3351 * of the return value is void. If the return type of the function is
3352 * also void, then this should compile without error. Seriously.
3354 const glsl_type
*const ret_type
=
3355 (ret
== NULL
) ? glsl_type::void_type
: ret
->type
;
3357 /* Implicit conversions are not allowed for return values. */
3358 if (state
->current_function
->return_type
!= ret_type
) {
3359 YYLTYPE loc
= this->get_location();
3361 _mesa_glsl_error(& loc
, state
,
3362 "`return' with wrong type %s, in function `%s' "
3365 state
->current_function
->function_name(),
3366 state
->current_function
->return_type
->name
);
3369 inst
= new(ctx
) ir_return(ret
);
3371 if (state
->current_function
->return_type
->base_type
!=
3373 YYLTYPE loc
= this->get_location();
3375 _mesa_glsl_error(& loc
, state
,
3376 "`return' with no value, in function %s returning "
3378 state
->current_function
->function_name());
3380 inst
= new(ctx
) ir_return
;
3383 state
->found_return
= true;
3384 instructions
->push_tail(inst
);
3389 if (state
->target
!= fragment_shader
) {
3390 YYLTYPE loc
= this->get_location();
3392 _mesa_glsl_error(& loc
, state
,
3393 "`discard' may only appear in a fragment shader");
3395 instructions
->push_tail(new(ctx
) ir_discard
);
3400 if (mode
== ast_continue
&&
3401 state
->loop_nesting_ast
== NULL
) {
3402 YYLTYPE loc
= this->get_location();
3404 _mesa_glsl_error(& loc
, state
,
3405 "continue may only appear in a loop");
3406 } else if (mode
== ast_break
&&
3407 state
->loop_nesting_ast
== NULL
&&
3408 state
->switch_state
.switch_nesting_ast
== NULL
) {
3409 YYLTYPE loc
= this->get_location();
3411 _mesa_glsl_error(& loc
, state
,
3412 "break may only appear in a loop or a switch");
3414 /* For a loop, inline the for loop expression again,
3415 * since we don't know where near the end of
3416 * the loop body the normal copy of it
3417 * is going to be placed.
3419 if (state
->loop_nesting_ast
!= NULL
&&
3420 mode
== ast_continue
&&
3421 state
->loop_nesting_ast
->rest_expression
) {
3422 state
->loop_nesting_ast
->rest_expression
->hir(instructions
,
3426 if (state
->switch_state
.is_switch_innermost
&&
3427 mode
== ast_break
) {
3428 /* Force break out of switch by setting is_break switch state.
3430 ir_variable
*const is_break_var
= state
->switch_state
.is_break_var
;
3431 ir_dereference_variable
*const deref_is_break_var
=
3432 new(ctx
) ir_dereference_variable(is_break_var
);
3433 ir_constant
*const true_val
= new(ctx
) ir_constant(true);
3434 ir_assignment
*const set_break_var
=
3435 new(ctx
) ir_assignment(deref_is_break_var
,
3439 instructions
->push_tail(set_break_var
);
3442 ir_loop_jump
*const jump
=
3443 new(ctx
) ir_loop_jump((mode
== ast_break
)
3444 ? ir_loop_jump::jump_break
3445 : ir_loop_jump::jump_continue
);
3446 instructions
->push_tail(jump
);
3453 /* Jump instructions do not have r-values.
3460 ast_selection_statement::hir(exec_list
*instructions
,
3461 struct _mesa_glsl_parse_state
*state
)
3465 ir_rvalue
*const condition
= this->condition
->hir(instructions
, state
);
3467 /* From page 66 (page 72 of the PDF) of the GLSL 1.50 spec:
3469 * "Any expression whose type evaluates to a Boolean can be used as the
3470 * conditional expression bool-expression. Vector types are not accepted
3471 * as the expression to if."
3473 * The checks are separated so that higher quality diagnostics can be
3474 * generated for cases where both rules are violated.
3476 if (!condition
->type
->is_boolean() || !condition
->type
->is_scalar()) {
3477 YYLTYPE loc
= this->condition
->get_location();
3479 _mesa_glsl_error(& loc
, state
, "if-statement condition must be scalar "
3483 ir_if
*const stmt
= new(ctx
) ir_if(condition
);
3485 if (then_statement
!= NULL
) {
3486 state
->symbols
->push_scope();
3487 then_statement
->hir(& stmt
->then_instructions
, state
);
3488 state
->symbols
->pop_scope();
3491 if (else_statement
!= NULL
) {
3492 state
->symbols
->push_scope();
3493 else_statement
->hir(& stmt
->else_instructions
, state
);
3494 state
->symbols
->pop_scope();
3497 instructions
->push_tail(stmt
);
3499 /* if-statements do not have r-values.
3506 ast_switch_statement::hir(exec_list
*instructions
,
3507 struct _mesa_glsl_parse_state
*state
)
3511 ir_rvalue
*const test_expression
=
3512 this->test_expression
->hir(instructions
, state
);
3514 /* From page 66 (page 55 of the PDF) of the GLSL 1.50 spec:
3516 * "The type of init-expression in a switch statement must be a
3519 * The checks are separated so that higher quality diagnostics can be
3520 * generated for cases where the rule is violated.
3522 if (!test_expression
->type
->is_integer()) {
3523 YYLTYPE loc
= this->test_expression
->get_location();
3525 _mesa_glsl_error(& loc
,
3527 "switch-statement expression must be scalar "
3531 /* Track the switch-statement nesting in a stack-like manner.
3533 struct glsl_switch_state saved
= state
->switch_state
;
3535 state
->switch_state
.is_switch_innermost
= true;
3536 state
->switch_state
.switch_nesting_ast
= this;
3538 /* Initalize is_fallthru state to false.
3540 ir_rvalue
*const is_fallthru_val
= new (ctx
) ir_constant(false);
3541 state
->switch_state
.is_fallthru_var
=
3542 new(ctx
) ir_variable(glsl_type::bool_type
,
3543 "switch_is_fallthru_tmp",
3545 instructions
->push_tail(state
->switch_state
.is_fallthru_var
);
3547 ir_dereference_variable
*deref_is_fallthru_var
=
3548 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
3549 instructions
->push_tail(new(ctx
) ir_assignment(deref_is_fallthru_var
,
3553 /* Initalize is_break state to false.
3555 ir_rvalue
*const is_break_val
= new (ctx
) ir_constant(false);
3556 state
->switch_state
.is_break_var
= new(ctx
) ir_variable(glsl_type::bool_type
,
3557 "switch_is_break_tmp",
3559 instructions
->push_tail(state
->switch_state
.is_break_var
);
3561 ir_dereference_variable
*deref_is_break_var
=
3562 new(ctx
) ir_dereference_variable(state
->switch_state
.is_break_var
);
3563 instructions
->push_tail(new(ctx
) ir_assignment(deref_is_break_var
,
3567 /* Cache test expression.
3569 test_to_hir(instructions
, state
);
3571 /* Emit code for body of switch stmt.
3573 body
->hir(instructions
, state
);
3575 state
->switch_state
= saved
;
3577 /* Switch statements do not have r-values.
3584 ast_switch_statement::test_to_hir(exec_list
*instructions
,
3585 struct _mesa_glsl_parse_state
*state
)
3589 /* Cache value of test expression.
3591 ir_rvalue
*const test_val
=
3592 test_expression
->hir(instructions
,
3595 state
->switch_state
.test_var
= new(ctx
) ir_variable(glsl_type::int_type
,
3598 ir_dereference_variable
*deref_test_var
=
3599 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
3601 instructions
->push_tail(state
->switch_state
.test_var
);
3602 instructions
->push_tail(new(ctx
) ir_assignment(deref_test_var
,
3609 ast_switch_body::hir(exec_list
*instructions
,
3610 struct _mesa_glsl_parse_state
*state
)
3613 stmts
->hir(instructions
, state
);
3615 /* Switch bodies do not have r-values.
3622 ast_case_statement_list::hir(exec_list
*instructions
,
3623 struct _mesa_glsl_parse_state
*state
)
3625 foreach_list_typed (ast_case_statement
, case_stmt
, link
, & this->cases
)
3626 case_stmt
->hir(instructions
, state
);
3628 /* Case statements do not have r-values.
3635 ast_case_statement::hir(exec_list
*instructions
,
3636 struct _mesa_glsl_parse_state
*state
)
3638 labels
->hir(instructions
, state
);
3640 /* Conditionally set fallthru state based on break state.
3642 ir_constant
*const false_val
= new(state
) ir_constant(false);
3643 ir_dereference_variable
*const deref_is_fallthru_var
=
3644 new(state
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
3645 ir_dereference_variable
*const deref_is_break_var
=
3646 new(state
) ir_dereference_variable(state
->switch_state
.is_break_var
);
3647 ir_assignment
*const reset_fallthru_on_break
=
3648 new(state
) ir_assignment(deref_is_fallthru_var
,
3650 deref_is_break_var
);
3651 instructions
->push_tail(reset_fallthru_on_break
);
3653 /* Guard case statements depending on fallthru state.
3655 ir_dereference_variable
*const deref_fallthru_guard
=
3656 new(state
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
3657 ir_if
*const test_fallthru
= new(state
) ir_if(deref_fallthru_guard
);
3659 foreach_list_typed (ast_node
, stmt
, link
, & this->stmts
)
3660 stmt
->hir(& test_fallthru
->then_instructions
, state
);
3662 instructions
->push_tail(test_fallthru
);
3664 /* Case statements do not have r-values.
3671 ast_case_label_list::hir(exec_list
*instructions
,
3672 struct _mesa_glsl_parse_state
*state
)
3674 foreach_list_typed (ast_case_label
, label
, link
, & this->labels
)
3675 label
->hir(instructions
, state
);
3677 /* Case labels do not have r-values.
3684 ast_case_label::hir(exec_list
*instructions
,
3685 struct _mesa_glsl_parse_state
*state
)
3689 ir_dereference_variable
*deref_fallthru_var
=
3690 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
3692 ir_rvalue
*const true_val
= new(ctx
) ir_constant(true);
3694 /* If not default case, ...
3696 if (this->test_value
!= NULL
) {
3697 /* Conditionally set fallthru state based on
3698 * comparison of cached test expression value to case label.
3700 ir_rvalue
*const label_rval
= this->test_value
->hir(instructions
, state
);
3701 ir_constant
*label_const
= label_rval
->constant_expression_value();
3704 YYLTYPE loc
= this->test_value
->get_location();
3706 _mesa_glsl_error(& loc
, state
,
3707 "switch statement case label must be a "
3708 "constant expression");
3710 /* Stuff a dummy value in to allow processing to continue. */
3711 label_const
= new(ctx
) ir_constant(0);
3714 ir_dereference_variable
*deref_test_var
=
3715 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
3717 ir_rvalue
*const test_cond
= new(ctx
) ir_expression(ir_binop_all_equal
,
3718 glsl_type::bool_type
,
3722 ir_assignment
*set_fallthru_on_test
=
3723 new(ctx
) ir_assignment(deref_fallthru_var
,
3727 instructions
->push_tail(set_fallthru_on_test
);
3728 } else { /* default case */
3729 /* Set falltrhu state.
3731 ir_assignment
*set_fallthru
=
3732 new(ctx
) ir_assignment(deref_fallthru_var
,
3736 instructions
->push_tail(set_fallthru
);
3739 /* Case statements do not have r-values.
3746 ast_iteration_statement::condition_to_hir(ir_loop
*stmt
,
3747 struct _mesa_glsl_parse_state
*state
)
3751 if (condition
!= NULL
) {
3752 ir_rvalue
*const cond
=
3753 condition
->hir(& stmt
->body_instructions
, state
);
3756 || !cond
->type
->is_boolean() || !cond
->type
->is_scalar()) {
3757 YYLTYPE loc
= condition
->get_location();
3759 _mesa_glsl_error(& loc
, state
,
3760 "loop condition must be scalar boolean");
3762 /* As the first code in the loop body, generate a block that looks
3763 * like 'if (!condition) break;' as the loop termination condition.
3765 ir_rvalue
*const not_cond
=
3766 new(ctx
) ir_expression(ir_unop_logic_not
, glsl_type::bool_type
, cond
,
3769 ir_if
*const if_stmt
= new(ctx
) ir_if(not_cond
);
3771 ir_jump
*const break_stmt
=
3772 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
3774 if_stmt
->then_instructions
.push_tail(break_stmt
);
3775 stmt
->body_instructions
.push_tail(if_stmt
);
3782 ast_iteration_statement::hir(exec_list
*instructions
,
3783 struct _mesa_glsl_parse_state
*state
)
3787 /* For-loops and while-loops start a new scope, but do-while loops do not.
3789 if (mode
!= ast_do_while
)
3790 state
->symbols
->push_scope();
3792 if (init_statement
!= NULL
)
3793 init_statement
->hir(instructions
, state
);
3795 ir_loop
*const stmt
= new(ctx
) ir_loop();
3796 instructions
->push_tail(stmt
);
3798 /* Track the current loop nesting.
3800 ast_iteration_statement
*nesting_ast
= state
->loop_nesting_ast
;
3802 state
->loop_nesting_ast
= this;
3804 /* Likewise, indicate that following code is closest to a loop,
3805 * NOT closest to a switch.
3807 bool saved_is_switch_innermost
= state
->switch_state
.is_switch_innermost
;
3808 state
->switch_state
.is_switch_innermost
= false;
3810 if (mode
!= ast_do_while
)
3811 condition_to_hir(stmt
, state
);
3814 body
->hir(& stmt
->body_instructions
, state
);
3816 if (rest_expression
!= NULL
)
3817 rest_expression
->hir(& stmt
->body_instructions
, state
);
3819 if (mode
== ast_do_while
)
3820 condition_to_hir(stmt
, state
);
3822 if (mode
!= ast_do_while
)
3823 state
->symbols
->pop_scope();
3825 /* Restore previous nesting before returning.
3827 state
->loop_nesting_ast
= nesting_ast
;
3828 state
->switch_state
.is_switch_innermost
= saved_is_switch_innermost
;
3830 /* Loops do not have r-values.
3837 ast_type_specifier::hir(exec_list
*instructions
,
3838 struct _mesa_glsl_parse_state
*state
)
3840 if (!this->is_precision_statement
&& this->structure
== NULL
)
3843 YYLTYPE loc
= this->get_location();
3845 if (this->precision
!= ast_precision_none
3846 && state
->language_version
!= 100
3847 && state
->language_version
< 130) {
3848 _mesa_glsl_error(&loc
, state
,
3849 "precision qualifiers exist only in "
3850 "GLSL ES 1.00, and GLSL 1.30 and later");
3853 if (this->precision
!= ast_precision_none
3854 && this->structure
!= NULL
) {
3855 _mesa_glsl_error(&loc
, state
,
3856 "precision qualifiers do not apply to structures");
3860 /* If this is a precision statement, check that the type to which it is
3861 * applied is either float or int.
3863 * From section 4.5.3 of the GLSL 1.30 spec:
3864 * "The precision statement
3865 * precision precision-qualifier type;
3866 * can be used to establish a default precision qualifier. The type
3867 * field can be either int or float [...]. Any other types or
3868 * qualifiers will result in an error.
3870 if (this->is_precision_statement
) {
3871 assert(this->precision
!= ast_precision_none
);
3872 assert(this->structure
== NULL
); /* The check for structures was
3873 * performed above. */
3874 if (this->is_array
) {
3875 _mesa_glsl_error(&loc
, state
,
3876 "default precision statements do not apply to "
3880 if (this->type_specifier
!= ast_float
3881 && this->type_specifier
!= ast_int
) {
3882 _mesa_glsl_error(&loc
, state
,
3883 "default precision statements apply only to types "
3888 /* FINISHME: Translate precision statements into IR. */
3892 if (this->structure
!= NULL
)
3893 return this->structure
->hir(instructions
, state
);
3900 ast_struct_specifier::hir(exec_list
*instructions
,
3901 struct _mesa_glsl_parse_state
*state
)
3903 unsigned decl_count
= 0;
3905 /* Make an initial pass over the list of structure fields to determine how
3906 * many there are. Each element in this list is an ast_declarator_list.
3907 * This means that we actually need to count the number of elements in the
3908 * 'declarations' list in each of the elements.
3910 foreach_list_typed (ast_declarator_list
, decl_list
, link
,
3911 &this->declarations
) {
3912 foreach_list_const (decl_ptr
, & decl_list
->declarations
) {
3917 /* Allocate storage for the structure fields and process the field
3918 * declarations. As the declarations are processed, try to also convert
3919 * the types to HIR. This ensures that structure definitions embedded in
3920 * other structure definitions are processed.
3922 glsl_struct_field
*const fields
= ralloc_array(state
, glsl_struct_field
,
3926 foreach_list_typed (ast_declarator_list
, decl_list
, link
,
3927 &this->declarations
) {
3928 const char *type_name
;
3930 decl_list
->type
->specifier
->hir(instructions
, state
);
3932 /* Section 10.9 of the GLSL ES 1.00 specification states that
3933 * embedded structure definitions have been removed from the language.
3935 if (state
->es_shader
&& decl_list
->type
->specifier
->structure
!= NULL
) {
3936 YYLTYPE loc
= this->get_location();
3937 _mesa_glsl_error(&loc
, state
, "Embedded structure definitions are "
3938 "not allowed in GLSL ES 1.00.");
3941 const glsl_type
*decl_type
=
3942 decl_list
->type
->specifier
->glsl_type(& type_name
, state
);
3944 foreach_list_typed (ast_declaration
, decl
, link
,
3945 &decl_list
->declarations
) {
3946 const struct glsl_type
*field_type
= decl_type
;
3947 if (decl
->is_array
) {
3948 YYLTYPE loc
= decl
->get_location();
3949 field_type
= process_array_type(&loc
, decl_type
, decl
->array_size
,
3952 fields
[i
].type
= (field_type
!= NULL
)
3953 ? field_type
: glsl_type::error_type
;
3954 fields
[i
].name
= decl
->identifier
;
3959 assert(i
== decl_count
);
3961 const glsl_type
*t
=
3962 glsl_type::get_record_instance(fields
, decl_count
, this->name
);
3964 YYLTYPE loc
= this->get_location();
3965 if (!state
->symbols
->add_type(name
, t
)) {
3966 _mesa_glsl_error(& loc
, state
, "struct `%s' previously defined", name
);
3968 const glsl_type
**s
= reralloc(state
, state
->user_structures
,
3970 state
->num_user_structures
+ 1);
3972 s
[state
->num_user_structures
] = t
;
3973 state
->user_structures
= s
;
3974 state
->num_user_structures
++;
3978 /* Structure type definitions do not have r-values.