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 ir_rvalue
*lhs
, ir_rvalue
*rhs
, bool is_initializer
,
671 bool error_emitted
= (lhs
->type
->is_error() || rhs
->type
->is_error());
673 if (!error_emitted
) {
674 if (lhs
->variable_referenced() != NULL
675 && lhs
->variable_referenced()->read_only
) {
676 _mesa_glsl_error(&lhs_loc
, state
,
677 "assignment to read-only variable '%s'",
678 lhs
->variable_referenced()->name
);
679 error_emitted
= true;
681 } else if (state
->language_version
<= 110 && lhs
->type
->is_array()) {
682 /* From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
684 * "Other binary or unary expressions, non-dereferenced
685 * arrays, function names, swizzles with repeated fields,
686 * and constants cannot be l-values."
688 _mesa_glsl_error(&lhs_loc
, state
, "whole array assignment is not "
689 "allowed in GLSL 1.10 or GLSL ES 1.00.");
690 error_emitted
= true;
691 } else if (!lhs
->is_lvalue()) {
692 _mesa_glsl_error(& lhs_loc
, state
, "non-lvalue in assignment");
693 error_emitted
= true;
698 validate_assignment(state
, lhs
->type
, rhs
, is_initializer
);
699 if (new_rhs
== NULL
) {
700 _mesa_glsl_error(& lhs_loc
, state
, "type mismatch");
704 /* If the LHS array was not declared with a size, it takes it size from
705 * the RHS. If the LHS is an l-value and a whole array, it must be a
706 * dereference of a variable. Any other case would require that the LHS
707 * is either not an l-value or not a whole array.
709 if (lhs
->type
->array_size() == 0) {
710 ir_dereference
*const d
= lhs
->as_dereference();
714 ir_variable
*const var
= d
->variable_referenced();
718 if (var
->max_array_access
>= unsigned(rhs
->type
->array_size())) {
719 /* FINISHME: This should actually log the location of the RHS. */
720 _mesa_glsl_error(& lhs_loc
, state
, "array size must be > %u due to "
722 var
->max_array_access
);
725 var
->type
= glsl_type::get_array_instance(lhs
->type
->element_type(),
726 rhs
->type
->array_size());
729 mark_whole_array_access(rhs
);
730 mark_whole_array_access(lhs
);
733 /* Most callers of do_assignment (assign, add_assign, pre_inc/dec,
734 * but not post_inc) need the converted assigned value as an rvalue
735 * to handle things like:
739 * So we always just store the computed value being assigned to a
740 * temporary and return a deref of that temporary. If the rvalue
741 * ends up not being used, the temp will get copy-propagated out.
743 ir_variable
*var
= new(ctx
) ir_variable(rhs
->type
, "assignment_tmp",
745 ir_dereference_variable
*deref_var
= new(ctx
) ir_dereference_variable(var
);
746 instructions
->push_tail(var
);
747 instructions
->push_tail(new(ctx
) ir_assignment(deref_var
,
750 deref_var
= new(ctx
) ir_dereference_variable(var
);
753 instructions
->push_tail(new(ctx
) ir_assignment(lhs
, deref_var
, NULL
));
755 return new(ctx
) ir_dereference_variable(var
);
759 get_lvalue_copy(exec_list
*instructions
, ir_rvalue
*lvalue
)
761 void *ctx
= ralloc_parent(lvalue
);
764 var
= new(ctx
) ir_variable(lvalue
->type
, "_post_incdec_tmp",
766 instructions
->push_tail(var
);
767 var
->mode
= ir_var_auto
;
769 instructions
->push_tail(new(ctx
) ir_assignment(new(ctx
) ir_dereference_variable(var
),
772 /* Once we've created this temporary, mark it read only so it's no
773 * longer considered an lvalue.
775 var
->read_only
= true;
777 return new(ctx
) ir_dereference_variable(var
);
782 ast_node::hir(exec_list
*instructions
,
783 struct _mesa_glsl_parse_state
*state
)
792 do_comparison(void *mem_ctx
, int operation
, ir_rvalue
*op0
, ir_rvalue
*op1
)
795 ir_rvalue
*cmp
= NULL
;
797 if (operation
== ir_binop_all_equal
)
798 join_op
= ir_binop_logic_and
;
800 join_op
= ir_binop_logic_or
;
802 switch (op0
->type
->base_type
) {
803 case GLSL_TYPE_FLOAT
:
807 return new(mem_ctx
) ir_expression(operation
, op0
, op1
);
809 case GLSL_TYPE_ARRAY
: {
810 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
811 ir_rvalue
*e0
, *e1
, *result
;
813 e0
= new(mem_ctx
) ir_dereference_array(op0
->clone(mem_ctx
, NULL
),
814 new(mem_ctx
) ir_constant(i
));
815 e1
= new(mem_ctx
) ir_dereference_array(op1
->clone(mem_ctx
, NULL
),
816 new(mem_ctx
) ir_constant(i
));
817 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
820 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
826 mark_whole_array_access(op0
);
827 mark_whole_array_access(op1
);
831 case GLSL_TYPE_STRUCT
: {
832 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
833 ir_rvalue
*e0
, *e1
, *result
;
834 const char *field_name
= op0
->type
->fields
.structure
[i
].name
;
836 e0
= new(mem_ctx
) ir_dereference_record(op0
->clone(mem_ctx
, NULL
),
838 e1
= new(mem_ctx
) ir_dereference_record(op1
->clone(mem_ctx
, NULL
),
840 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
843 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
851 case GLSL_TYPE_ERROR
:
853 case GLSL_TYPE_SAMPLER
:
854 /* I assume a comparison of a struct containing a sampler just
855 * ignores the sampler present in the type.
860 assert(!"Should not get here.");
865 cmp
= new(mem_ctx
) ir_constant(true);
870 /* For logical operations, we want to ensure that the operands are
871 * scalar booleans. If it isn't, emit an error and return a constant
872 * boolean to avoid triggering cascading error messages.
875 get_scalar_boolean_operand(exec_list
*instructions
,
876 struct _mesa_glsl_parse_state
*state
,
877 ast_expression
*parent_expr
,
879 const char *operand_name
,
882 ast_expression
*expr
= parent_expr
->subexpressions
[operand
];
884 ir_rvalue
*val
= expr
->hir(instructions
, state
);
886 if (val
->type
->is_boolean() && val
->type
->is_scalar())
889 if (!*error_emitted
) {
890 YYLTYPE loc
= expr
->get_location();
891 _mesa_glsl_error(&loc
, state
, "%s of `%s' must be scalar boolean",
893 parent_expr
->operator_string(parent_expr
->oper
));
894 *error_emitted
= true;
897 return new(ctx
) ir_constant(true);
901 * If name refers to a builtin array whose maximum allowed size is less than
902 * size, report an error and return true. Otherwise return false.
905 check_builtin_array_max_size(const char *name
, unsigned size
,
906 YYLTYPE loc
, struct _mesa_glsl_parse_state
*state
)
908 if ((strcmp("gl_TexCoord", name
) == 0)
909 && (size
> state
->Const
.MaxTextureCoords
)) {
910 /* From page 54 (page 60 of the PDF) of the GLSL 1.20 spec:
912 * "The size [of gl_TexCoord] can be at most
913 * gl_MaxTextureCoords."
915 _mesa_glsl_error(&loc
, state
, "`gl_TexCoord' array size cannot "
916 "be larger than gl_MaxTextureCoords (%u)\n",
917 state
->Const
.MaxTextureCoords
);
919 } else if (strcmp("gl_ClipDistance", name
) == 0
920 && size
> state
->Const
.MaxClipPlanes
) {
921 /* From section 7.1 (Vertex Shader Special Variables) of the
924 * "The gl_ClipDistance array is predeclared as unsized and
925 * must be sized by the shader either redeclaring it with a
926 * size or indexing it only with integral constant
927 * expressions. ... The size can be at most
928 * gl_MaxClipDistances."
930 _mesa_glsl_error(&loc
, state
, "`gl_ClipDistance' array size cannot "
931 "be larger than gl_MaxClipDistances (%u)\n",
932 state
->Const
.MaxClipPlanes
);
939 * Create the constant 1, of a which is appropriate for incrementing and
940 * decrementing values of the given GLSL type. For example, if type is vec4,
941 * this creates a constant value of 1.0 having type float.
943 * If the given type is invalid for increment and decrement operators, return
944 * a floating point 1--the error will be detected later.
947 constant_one_for_inc_dec(void *ctx
, const glsl_type
*type
)
949 switch (type
->base_type
) {
951 return new(ctx
) ir_constant((unsigned) 1);
953 return new(ctx
) ir_constant(1);
955 case GLSL_TYPE_FLOAT
:
956 return new(ctx
) ir_constant(1.0f
);
961 ast_expression::hir(exec_list
*instructions
,
962 struct _mesa_glsl_parse_state
*state
)
965 static const int operations
[AST_NUM_OPERATORS
] = {
966 -1, /* ast_assign doesn't convert to ir_expression. */
967 -1, /* ast_plus doesn't convert to ir_expression. */
991 /* Note: The following block of expression types actually convert
992 * to multiple IR instructions.
994 ir_binop_mul
, /* ast_mul_assign */
995 ir_binop_div
, /* ast_div_assign */
996 ir_binop_mod
, /* ast_mod_assign */
997 ir_binop_add
, /* ast_add_assign */
998 ir_binop_sub
, /* ast_sub_assign */
999 ir_binop_lshift
, /* ast_ls_assign */
1000 ir_binop_rshift
, /* ast_rs_assign */
1001 ir_binop_bit_and
, /* ast_and_assign */
1002 ir_binop_bit_xor
, /* ast_xor_assign */
1003 ir_binop_bit_or
, /* ast_or_assign */
1005 -1, /* ast_conditional doesn't convert to ir_expression. */
1006 ir_binop_add
, /* ast_pre_inc. */
1007 ir_binop_sub
, /* ast_pre_dec. */
1008 ir_binop_add
, /* ast_post_inc. */
1009 ir_binop_sub
, /* ast_post_dec. */
1010 -1, /* ast_field_selection doesn't conv to ir_expression. */
1011 -1, /* ast_array_index doesn't convert to ir_expression. */
1012 -1, /* ast_function_call doesn't conv to ir_expression. */
1013 -1, /* ast_identifier doesn't convert to ir_expression. */
1014 -1, /* ast_int_constant doesn't convert to ir_expression. */
1015 -1, /* ast_uint_constant doesn't conv to ir_expression. */
1016 -1, /* ast_float_constant doesn't conv to ir_expression. */
1017 -1, /* ast_bool_constant doesn't conv to ir_expression. */
1018 -1, /* ast_sequence doesn't convert to ir_expression. */
1020 ir_rvalue
*result
= NULL
;
1022 const struct glsl_type
*type
; /* a temporary variable for switch cases */
1023 bool error_emitted
= false;
1026 loc
= this->get_location();
1028 switch (this->oper
) {
1030 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1031 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1033 result
= do_assignment(instructions
, state
, op
[0], op
[1], false,
1034 this->subexpressions
[0]->get_location());
1035 error_emitted
= result
->type
->is_error();
1040 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1042 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1044 error_emitted
= type
->is_error();
1050 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1052 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1054 error_emitted
= type
->is_error();
1056 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1064 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1065 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1067 type
= arithmetic_result_type(op
[0], op
[1],
1068 (this->oper
== ast_mul
),
1070 error_emitted
= type
->is_error();
1072 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1077 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1078 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1080 type
= modulus_result_type(op
[0]->type
, op
[1]->type
, state
, & loc
);
1082 assert(operations
[this->oper
] == ir_binop_mod
);
1084 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1086 error_emitted
= type
->is_error();
1091 if (state
->language_version
< 130) {
1092 _mesa_glsl_error(&loc
, state
, "operator %s requires GLSL 1.30",
1093 operator_string(this->oper
));
1094 error_emitted
= true;
1097 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1098 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1099 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1101 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1103 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1110 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1111 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1113 type
= relational_result_type(op
[0], op
[1], state
, & loc
);
1115 /* The relational operators must either generate an error or result
1116 * in a scalar boolean. See page 57 of the GLSL 1.50 spec.
1118 assert(type
->is_error()
1119 || ((type
->base_type
== GLSL_TYPE_BOOL
)
1120 && type
->is_scalar()));
1122 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1124 error_emitted
= type
->is_error();
1129 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1130 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1132 /* From page 58 (page 64 of the PDF) of the GLSL 1.50 spec:
1134 * "The equality operators equal (==), and not equal (!=)
1135 * operate on all types. They result in a scalar Boolean. If
1136 * the operand types do not match, then there must be a
1137 * conversion from Section 4.1.10 "Implicit Conversions"
1138 * applied to one operand that can make them match, in which
1139 * case this conversion is done."
1141 if ((!apply_implicit_conversion(op
[0]->type
, op
[1], state
)
1142 && !apply_implicit_conversion(op
[1]->type
, op
[0], state
))
1143 || (op
[0]->type
!= op
[1]->type
)) {
1144 _mesa_glsl_error(& loc
, state
, "operands of `%s' must have the same "
1145 "type", (this->oper
== ast_equal
) ? "==" : "!=");
1146 error_emitted
= true;
1147 } else if ((state
->language_version
<= 110)
1148 && (op
[0]->type
->is_array() || op
[1]->type
->is_array())) {
1149 _mesa_glsl_error(& loc
, state
, "array comparisons forbidden in "
1151 error_emitted
= true;
1154 if (error_emitted
) {
1155 result
= new(ctx
) ir_constant(false);
1157 result
= do_comparison(ctx
, operations
[this->oper
], op
[0], op
[1]);
1158 assert(result
->type
== glsl_type::bool_type
);
1165 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1166 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1167 type
= bit_logic_result_type(op
[0]->type
, op
[1]->type
, this->oper
,
1169 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1171 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1175 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1177 if (state
->language_version
< 130) {
1178 _mesa_glsl_error(&loc
, state
, "bit-wise operations require GLSL 1.30");
1179 error_emitted
= true;
1182 if (!op
[0]->type
->is_integer()) {
1183 _mesa_glsl_error(&loc
, state
, "operand of `~' must be an integer");
1184 error_emitted
= true;
1187 type
= error_emitted
? glsl_type::error_type
: op
[0]->type
;
1188 result
= new(ctx
) ir_expression(ir_unop_bit_not
, type
, op
[0], NULL
);
1191 case ast_logic_and
: {
1192 exec_list rhs_instructions
;
1193 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1194 "LHS", &error_emitted
);
1195 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1196 "RHS", &error_emitted
);
1198 ir_constant
*op0_const
= op
[0]->constant_expression_value();
1200 if (op0_const
->value
.b
[0]) {
1201 instructions
->append_list(&rhs_instructions
);
1206 type
= glsl_type::bool_type
;
1208 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1211 instructions
->push_tail(tmp
);
1213 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1214 instructions
->push_tail(stmt
);
1216 stmt
->then_instructions
.append_list(&rhs_instructions
);
1217 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1218 ir_assignment
*const then_assign
=
1219 new(ctx
) ir_assignment(then_deref
, op
[1], NULL
);
1220 stmt
->then_instructions
.push_tail(then_assign
);
1222 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1223 ir_assignment
*const else_assign
=
1224 new(ctx
) ir_assignment(else_deref
, new(ctx
) ir_constant(false), NULL
);
1225 stmt
->else_instructions
.push_tail(else_assign
);
1227 result
= new(ctx
) ir_dereference_variable(tmp
);
1233 case ast_logic_or
: {
1234 exec_list rhs_instructions
;
1235 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1236 "LHS", &error_emitted
);
1237 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1238 "RHS", &error_emitted
);
1240 ir_constant
*op0_const
= op
[0]->constant_expression_value();
1242 if (op0_const
->value
.b
[0]) {
1247 type
= glsl_type::bool_type
;
1249 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1252 instructions
->push_tail(tmp
);
1254 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1255 instructions
->push_tail(stmt
);
1257 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1258 ir_assignment
*const then_assign
=
1259 new(ctx
) ir_assignment(then_deref
, new(ctx
) ir_constant(true), NULL
);
1260 stmt
->then_instructions
.push_tail(then_assign
);
1262 stmt
->else_instructions
.append_list(&rhs_instructions
);
1263 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1264 ir_assignment
*const else_assign
=
1265 new(ctx
) ir_assignment(else_deref
, op
[1], NULL
);
1266 stmt
->else_instructions
.push_tail(else_assign
);
1268 result
= new(ctx
) ir_dereference_variable(tmp
);
1275 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1277 * "The logical binary operators and (&&), or ( | | ), and
1278 * exclusive or (^^). They operate only on two Boolean
1279 * expressions and result in a Boolean expression."
1281 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0, "LHS",
1283 op
[1] = get_scalar_boolean_operand(instructions
, state
, this, 1, "RHS",
1286 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1291 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1292 "operand", &error_emitted
);
1294 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1298 case ast_mul_assign
:
1299 case ast_div_assign
:
1300 case ast_add_assign
:
1301 case ast_sub_assign
: {
1302 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1303 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1305 type
= arithmetic_result_type(op
[0], op
[1],
1306 (this->oper
== ast_mul_assign
),
1309 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1312 result
= do_assignment(instructions
, state
,
1313 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1314 this->subexpressions
[0]->get_location());
1315 error_emitted
= (op
[0]->type
->is_error());
1317 /* GLSL 1.10 does not allow array assignment. However, we don't have to
1318 * explicitly test for this because none of the binary expression
1319 * operators allow array operands either.
1325 case ast_mod_assign
: {
1326 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1327 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1329 type
= modulus_result_type(op
[0]->type
, op
[1]->type
, state
, & loc
);
1331 assert(operations
[this->oper
] == ir_binop_mod
);
1333 ir_rvalue
*temp_rhs
;
1334 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1337 result
= do_assignment(instructions
, state
,
1338 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1339 this->subexpressions
[0]->get_location());
1340 error_emitted
= type
->is_error();
1345 case ast_rs_assign
: {
1346 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1347 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1348 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1350 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1351 type
, op
[0], op
[1]);
1352 result
= do_assignment(instructions
, state
, op
[0]->clone(ctx
, NULL
),
1354 this->subexpressions
[0]->get_location());
1355 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1359 case ast_and_assign
:
1360 case ast_xor_assign
:
1361 case ast_or_assign
: {
1362 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1363 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1364 type
= bit_logic_result_type(op
[0]->type
, op
[1]->type
, this->oper
,
1366 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1367 type
, op
[0], op
[1]);
1368 result
= do_assignment(instructions
, state
, op
[0]->clone(ctx
, NULL
),
1370 this->subexpressions
[0]->get_location());
1371 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1375 case ast_conditional
: {
1376 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1378 * "The ternary selection operator (?:). It operates on three
1379 * expressions (exp1 ? exp2 : exp3). This operator evaluates the
1380 * first expression, which must result in a scalar Boolean."
1382 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1383 "condition", &error_emitted
);
1385 /* The :? operator is implemented by generating an anonymous temporary
1386 * followed by an if-statement. The last instruction in each branch of
1387 * the if-statement assigns a value to the anonymous temporary. This
1388 * temporary is the r-value of the expression.
1390 exec_list then_instructions
;
1391 exec_list else_instructions
;
1393 op
[1] = this->subexpressions
[1]->hir(&then_instructions
, state
);
1394 op
[2] = this->subexpressions
[2]->hir(&else_instructions
, state
);
1396 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1398 * "The second and third expressions can be any type, as
1399 * long their types match, or there is a conversion in
1400 * Section 4.1.10 "Implicit Conversions" that can be applied
1401 * to one of the expressions to make their types match. This
1402 * resulting matching type is the type of the entire
1405 if ((!apply_implicit_conversion(op
[1]->type
, op
[2], state
)
1406 && !apply_implicit_conversion(op
[2]->type
, op
[1], state
))
1407 || (op
[1]->type
!= op
[2]->type
)) {
1408 YYLTYPE loc
= this->subexpressions
[1]->get_location();
1410 _mesa_glsl_error(& loc
, state
, "Second and third operands of ?: "
1411 "operator must have matching types.");
1412 error_emitted
= true;
1413 type
= glsl_type::error_type
;
1418 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1420 * "The second and third expressions must be the same type, but can
1421 * be of any type other than an array."
1423 if ((state
->language_version
<= 110) && type
->is_array()) {
1424 _mesa_glsl_error(& loc
, state
, "Second and third operands of ?: "
1425 "operator must not be arrays.");
1426 error_emitted
= true;
1429 ir_constant
*cond_val
= op
[0]->constant_expression_value();
1430 ir_constant
*then_val
= op
[1]->constant_expression_value();
1431 ir_constant
*else_val
= op
[2]->constant_expression_value();
1433 if (then_instructions
.is_empty()
1434 && else_instructions
.is_empty()
1435 && (cond_val
!= NULL
) && (then_val
!= NULL
) && (else_val
!= NULL
)) {
1436 result
= (cond_val
->value
.b
[0]) ? then_val
: else_val
;
1438 ir_variable
*const tmp
=
1439 new(ctx
) ir_variable(type
, "conditional_tmp", ir_var_temporary
);
1440 instructions
->push_tail(tmp
);
1442 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1443 instructions
->push_tail(stmt
);
1445 then_instructions
.move_nodes_to(& stmt
->then_instructions
);
1446 ir_dereference
*const then_deref
=
1447 new(ctx
) ir_dereference_variable(tmp
);
1448 ir_assignment
*const then_assign
=
1449 new(ctx
) ir_assignment(then_deref
, op
[1], NULL
);
1450 stmt
->then_instructions
.push_tail(then_assign
);
1452 else_instructions
.move_nodes_to(& stmt
->else_instructions
);
1453 ir_dereference
*const else_deref
=
1454 new(ctx
) ir_dereference_variable(tmp
);
1455 ir_assignment
*const else_assign
=
1456 new(ctx
) ir_assignment(else_deref
, op
[2], NULL
);
1457 stmt
->else_instructions
.push_tail(else_assign
);
1459 result
= new(ctx
) ir_dereference_variable(tmp
);
1466 this->non_lvalue_description
= (this->oper
== ast_pre_inc
)
1467 ? "pre-increment operation" : "pre-decrement operation";
1469 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1470 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1472 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1474 ir_rvalue
*temp_rhs
;
1475 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1478 result
= do_assignment(instructions
, state
,
1479 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1480 this->subexpressions
[0]->get_location());
1481 error_emitted
= op
[0]->type
->is_error();
1486 case ast_post_dec
: {
1487 this->non_lvalue_description
= (this->oper
== ast_post_inc
)
1488 ? "post-increment operation" : "post-decrement operation";
1489 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1490 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1492 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1494 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1496 ir_rvalue
*temp_rhs
;
1497 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1500 /* Get a temporary of a copy of the lvalue before it's modified.
1501 * This may get thrown away later.
1503 result
= get_lvalue_copy(instructions
, op
[0]->clone(ctx
, NULL
));
1505 (void)do_assignment(instructions
, state
,
1506 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1507 this->subexpressions
[0]->get_location());
1509 error_emitted
= op
[0]->type
->is_error();
1513 case ast_field_selection
:
1514 result
= _mesa_ast_field_selection_to_hir(this, instructions
, state
);
1517 case ast_array_index
: {
1518 YYLTYPE index_loc
= subexpressions
[1]->get_location();
1520 op
[0] = subexpressions
[0]->hir(instructions
, state
);
1521 op
[1] = subexpressions
[1]->hir(instructions
, state
);
1523 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1525 ir_rvalue
*const array
= op
[0];
1527 result
= new(ctx
) ir_dereference_array(op
[0], op
[1]);
1529 /* Do not use op[0] after this point. Use array.
1537 if (!array
->type
->is_array()
1538 && !array
->type
->is_matrix()
1539 && !array
->type
->is_vector()) {
1540 _mesa_glsl_error(& index_loc
, state
,
1541 "cannot dereference non-array / non-matrix / "
1543 error_emitted
= true;
1546 if (!op
[1]->type
->is_integer()) {
1547 _mesa_glsl_error(& index_loc
, state
,
1548 "array index must be integer type");
1549 error_emitted
= true;
1550 } else if (!op
[1]->type
->is_scalar()) {
1551 _mesa_glsl_error(& index_loc
, state
,
1552 "array index must be scalar");
1553 error_emitted
= true;
1556 /* If the array index is a constant expression and the array has a
1557 * declared size, ensure that the access is in-bounds. If the array
1558 * index is not a constant expression, ensure that the array has a
1561 ir_constant
*const const_index
= op
[1]->constant_expression_value();
1562 if (const_index
!= NULL
) {
1563 const int idx
= const_index
->value
.i
[0];
1564 const char *type_name
;
1567 if (array
->type
->is_matrix()) {
1568 type_name
= "matrix";
1569 } else if (array
->type
->is_vector()) {
1570 type_name
= "vector";
1572 type_name
= "array";
1575 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec:
1577 * "It is illegal to declare an array with a size, and then
1578 * later (in the same shader) index the same array with an
1579 * integral constant expression greater than or equal to the
1580 * declared size. It is also illegal to index an array with a
1581 * negative constant expression."
1583 if (array
->type
->is_matrix()) {
1584 if (array
->type
->row_type()->vector_elements
<= idx
) {
1585 bound
= array
->type
->row_type()->vector_elements
;
1587 } else if (array
->type
->is_vector()) {
1588 if (array
->type
->vector_elements
<= idx
) {
1589 bound
= array
->type
->vector_elements
;
1592 if ((array
->type
->array_size() > 0)
1593 && (array
->type
->array_size() <= idx
)) {
1594 bound
= array
->type
->array_size();
1599 _mesa_glsl_error(& loc
, state
, "%s index must be < %u",
1601 error_emitted
= true;
1602 } else if (idx
< 0) {
1603 _mesa_glsl_error(& loc
, state
, "%s index must be >= 0",
1605 error_emitted
= true;
1608 if (array
->type
->is_array()) {
1609 /* If the array is a variable dereference, it dereferences the
1610 * whole array, by definition. Use this to get the variable.
1612 * FINISHME: Should some methods for getting / setting / testing
1613 * FINISHME: array access limits be added to ir_dereference?
1615 ir_variable
*const v
= array
->whole_variable_referenced();
1616 if ((v
!= NULL
) && (unsigned(idx
) > v
->max_array_access
)) {
1617 v
->max_array_access
= idx
;
1619 /* Check whether this access will, as a side effect, implicitly
1620 * cause the size of a built-in array to be too large.
1622 if (check_builtin_array_max_size(v
->name
, idx
+1, loc
, state
))
1623 error_emitted
= true;
1626 } else if (array
->type
->array_size() == 0) {
1627 _mesa_glsl_error(&loc
, state
, "unsized array index must be constant");
1629 if (array
->type
->is_array()) {
1630 /* whole_variable_referenced can return NULL if the array is a
1631 * member of a structure. In this case it is safe to not update
1632 * the max_array_access field because it is never used for fields
1635 ir_variable
*v
= array
->whole_variable_referenced();
1637 v
->max_array_access
= array
->type
->array_size() - 1;
1641 /* From page 23 (29 of the PDF) of the GLSL 1.30 spec:
1643 * "Samplers aggregated into arrays within a shader (using square
1644 * brackets [ ]) can only be indexed with integral constant
1645 * expressions [...]."
1647 * This restriction was added in GLSL 1.30. Shaders using earlier version
1648 * of the language should not be rejected by the compiler front-end for
1649 * using this construct. This allows useful things such as using a loop
1650 * counter as the index to an array of samplers. If the loop in unrolled,
1651 * the code should compile correctly. Instead, emit a warning.
1653 if (array
->type
->is_array() &&
1654 array
->type
->element_type()->is_sampler() &&
1655 const_index
== NULL
) {
1657 if (state
->language_version
== 100) {
1658 _mesa_glsl_warning(&loc
, state
,
1659 "sampler arrays indexed with non-constant "
1660 "expressions is optional in GLSL ES 1.00");
1661 } else if (state
->language_version
< 130) {
1662 _mesa_glsl_warning(&loc
, state
,
1663 "sampler arrays indexed with non-constant "
1664 "expressions is forbidden in GLSL 1.30 and "
1667 _mesa_glsl_error(&loc
, state
,
1668 "sampler arrays indexed with non-constant "
1669 "expressions is forbidden in GLSL 1.30 and "
1671 error_emitted
= true;
1676 result
->type
= glsl_type::error_type
;
1681 case ast_function_call
:
1682 /* Should *NEVER* get here. ast_function_call should always be handled
1683 * by ast_function_expression::hir.
1688 case ast_identifier
: {
1689 /* ast_identifier can appear several places in a full abstract syntax
1690 * tree. This particular use must be at location specified in the grammar
1691 * as 'variable_identifier'.
1694 state
->symbols
->get_variable(this->primary_expression
.identifier
);
1696 result
= new(ctx
) ir_dereference_variable(var
);
1701 _mesa_glsl_error(& loc
, state
, "`%s' undeclared",
1702 this->primary_expression
.identifier
);
1704 error_emitted
= true;
1709 case ast_int_constant
:
1710 result
= new(ctx
) ir_constant(this->primary_expression
.int_constant
);
1713 case ast_uint_constant
:
1714 result
= new(ctx
) ir_constant(this->primary_expression
.uint_constant
);
1717 case ast_float_constant
:
1718 result
= new(ctx
) ir_constant(this->primary_expression
.float_constant
);
1721 case ast_bool_constant
:
1722 result
= new(ctx
) ir_constant(bool(this->primary_expression
.bool_constant
));
1725 case ast_sequence
: {
1726 /* It should not be possible to generate a sequence in the AST without
1727 * any expressions in it.
1729 assert(!this->expressions
.is_empty());
1731 /* The r-value of a sequence is the last expression in the sequence. If
1732 * the other expressions in the sequence do not have side-effects (and
1733 * therefore add instructions to the instruction list), they get dropped
1736 exec_node
*previous_tail_pred
= NULL
;
1737 YYLTYPE previous_operand_loc
= loc
;
1739 foreach_list_typed (ast_node
, ast
, link
, &this->expressions
) {
1740 /* If one of the operands of comma operator does not generate any
1741 * code, we want to emit a warning. At each pass through the loop
1742 * previous_tail_pred will point to the last instruction in the
1743 * stream *before* processing the previous operand. Naturally,
1744 * instructions->tail_pred will point to the last instruction in the
1745 * stream *after* processing the previous operand. If the two
1746 * pointers match, then the previous operand had no effect.
1748 * The warning behavior here differs slightly from GCC. GCC will
1749 * only emit a warning if none of the left-hand operands have an
1750 * effect. However, it will emit a warning for each. I believe that
1751 * there are some cases in C (especially with GCC extensions) where
1752 * it is useful to have an intermediate step in a sequence have no
1753 * effect, but I don't think these cases exist in GLSL. Either way,
1754 * it would be a giant hassle to replicate that behavior.
1756 if (previous_tail_pred
== instructions
->tail_pred
) {
1757 _mesa_glsl_warning(&previous_operand_loc
, state
,
1758 "left-hand operand of comma expression has "
1762 /* tail_pred is directly accessed instead of using the get_tail()
1763 * method for performance reasons. get_tail() has extra code to
1764 * return NULL when the list is empty. We don't care about that
1765 * here, so using tail_pred directly is fine.
1767 previous_tail_pred
= instructions
->tail_pred
;
1768 previous_operand_loc
= ast
->get_location();
1770 result
= ast
->hir(instructions
, state
);
1773 /* Any errors should have already been emitted in the loop above.
1775 error_emitted
= true;
1779 type
= NULL
; /* use result->type, not type. */
1780 assert(result
!= NULL
);
1782 if (result
->type
->is_error() && !error_emitted
)
1783 _mesa_glsl_error(& loc
, state
, "type mismatch");
1790 ast_expression_statement::hir(exec_list
*instructions
,
1791 struct _mesa_glsl_parse_state
*state
)
1793 /* It is possible to have expression statements that don't have an
1794 * expression. This is the solitary semicolon:
1796 * for (i = 0; i < 5; i++)
1799 * In this case the expression will be NULL. Test for NULL and don't do
1800 * anything in that case.
1802 if (expression
!= NULL
)
1803 expression
->hir(instructions
, state
);
1805 /* Statements do not have r-values.
1812 ast_compound_statement::hir(exec_list
*instructions
,
1813 struct _mesa_glsl_parse_state
*state
)
1816 state
->symbols
->push_scope();
1818 foreach_list_typed (ast_node
, ast
, link
, &this->statements
)
1819 ast
->hir(instructions
, state
);
1822 state
->symbols
->pop_scope();
1824 /* Compound statements do not have r-values.
1830 static const glsl_type
*
1831 process_array_type(YYLTYPE
*loc
, const glsl_type
*base
, ast_node
*array_size
,
1832 struct _mesa_glsl_parse_state
*state
)
1834 unsigned length
= 0;
1836 /* From page 19 (page 25) of the GLSL 1.20 spec:
1838 * "Only one-dimensional arrays may be declared."
1840 if (base
->is_array()) {
1841 _mesa_glsl_error(loc
, state
,
1842 "invalid array of `%s' (only one-dimensional arrays "
1845 return glsl_type::error_type
;
1848 if (array_size
!= NULL
) {
1849 exec_list dummy_instructions
;
1850 ir_rvalue
*const ir
= array_size
->hir(& dummy_instructions
, state
);
1851 YYLTYPE loc
= array_size
->get_location();
1854 if (!ir
->type
->is_integer()) {
1855 _mesa_glsl_error(& loc
, state
, "array size must be integer type");
1856 } else if (!ir
->type
->is_scalar()) {
1857 _mesa_glsl_error(& loc
, state
, "array size must be scalar type");
1859 ir_constant
*const size
= ir
->constant_expression_value();
1862 _mesa_glsl_error(& loc
, state
, "array size must be a "
1863 "constant valued expression");
1864 } else if (size
->value
.i
[0] <= 0) {
1865 _mesa_glsl_error(& loc
, state
, "array size must be > 0");
1867 assert(size
->type
== ir
->type
);
1868 length
= size
->value
.u
[0];
1870 /* If the array size is const (and we've verified that
1871 * it is) then no instructions should have been emitted
1872 * when we converted it to HIR. If they were emitted,
1873 * then either the array size isn't const after all, or
1874 * we are emitting unnecessary instructions.
1876 assert(dummy_instructions
.is_empty());
1880 } else if (state
->es_shader
) {
1881 /* Section 10.17 of the GLSL ES 1.00 specification states that unsized
1882 * array declarations have been removed from the language.
1884 _mesa_glsl_error(loc
, state
, "unsized array declarations are not "
1885 "allowed in GLSL ES 1.00.");
1888 return glsl_type::get_array_instance(base
, length
);
1893 ast_type_specifier::glsl_type(const char **name
,
1894 struct _mesa_glsl_parse_state
*state
) const
1896 const struct glsl_type
*type
;
1898 type
= state
->symbols
->get_type(this->type_name
);
1899 *name
= this->type_name
;
1901 if (this->is_array
) {
1902 YYLTYPE loc
= this->get_location();
1903 type
= process_array_type(&loc
, type
, this->array_size
, state
);
1911 apply_type_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
1913 struct _mesa_glsl_parse_state
*state
,
1916 if (qual
->flags
.q
.invariant
) {
1918 _mesa_glsl_error(loc
, state
,
1919 "variable `%s' may not be redeclared "
1920 "`invariant' after being used",
1927 if (qual
->flags
.q
.constant
|| qual
->flags
.q
.attribute
1928 || qual
->flags
.q
.uniform
1929 || (qual
->flags
.q
.varying
&& (state
->target
== fragment_shader
)))
1932 if (qual
->flags
.q
.centroid
)
1935 if (qual
->flags
.q
.attribute
&& state
->target
!= vertex_shader
) {
1936 var
->type
= glsl_type::error_type
;
1937 _mesa_glsl_error(loc
, state
,
1938 "`attribute' variables may not be declared in the "
1940 _mesa_glsl_shader_target_name(state
->target
));
1943 /* From page 25 (page 31 of the PDF) of the GLSL 1.10 spec:
1945 * "The varying qualifier can be used only with the data types
1946 * float, vec2, vec3, vec4, mat2, mat3, and mat4, or arrays of
1949 if (qual
->flags
.q
.varying
) {
1950 const glsl_type
*non_array_type
;
1952 if (var
->type
&& var
->type
->is_array())
1953 non_array_type
= var
->type
->fields
.array
;
1955 non_array_type
= var
->type
;
1957 if (non_array_type
&& non_array_type
->base_type
!= GLSL_TYPE_FLOAT
) {
1958 var
->type
= glsl_type::error_type
;
1959 _mesa_glsl_error(loc
, state
,
1960 "varying variables must be of base type float");
1964 /* If there is no qualifier that changes the mode of the variable, leave
1965 * the setting alone.
1967 if (qual
->flags
.q
.in
&& qual
->flags
.q
.out
)
1968 var
->mode
= ir_var_inout
;
1969 else if (qual
->flags
.q
.attribute
|| qual
->flags
.q
.in
1970 || (qual
->flags
.q
.varying
&& (state
->target
== fragment_shader
)))
1971 var
->mode
= ir_var_in
;
1972 else if (qual
->flags
.q
.out
1973 || (qual
->flags
.q
.varying
&& (state
->target
== vertex_shader
)))
1974 var
->mode
= ir_var_out
;
1975 else if (qual
->flags
.q
.uniform
)
1976 var
->mode
= ir_var_uniform
;
1978 if (state
->all_invariant
&& (state
->current_function
== NULL
)) {
1979 switch (state
->target
) {
1981 if (var
->mode
== ir_var_out
)
1982 var
->invariant
= true;
1984 case geometry_shader
:
1985 if ((var
->mode
== ir_var_in
) || (var
->mode
== ir_var_out
))
1986 var
->invariant
= true;
1988 case fragment_shader
:
1989 if (var
->mode
== ir_var_in
)
1990 var
->invariant
= true;
1995 if (qual
->flags
.q
.flat
)
1996 var
->interpolation
= INTERP_QUALIFIER_FLAT
;
1997 else if (qual
->flags
.q
.noperspective
)
1998 var
->interpolation
= INTERP_QUALIFIER_NOPERSPECTIVE
;
1999 else if (qual
->flags
.q
.smooth
)
2000 var
->interpolation
= INTERP_QUALIFIER_SMOOTH
;
2002 var
->interpolation
= INTERP_QUALIFIER_NONE
;
2004 var
->pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
2005 var
->origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
2006 if ((qual
->flags
.q
.origin_upper_left
|| qual
->flags
.q
.pixel_center_integer
)
2007 && (strcmp(var
->name
, "gl_FragCoord") != 0)) {
2008 const char *const qual_string
= (qual
->flags
.q
.origin_upper_left
)
2009 ? "origin_upper_left" : "pixel_center_integer";
2011 _mesa_glsl_error(loc
, state
,
2012 "layout qualifier `%s' can only be applied to "
2013 "fragment shader input `gl_FragCoord'",
2017 if (qual
->flags
.q
.explicit_location
) {
2018 const bool global_scope
= (state
->current_function
== NULL
);
2020 const char *string
= "";
2022 /* In the vertex shader only shader inputs can be given explicit
2025 * In the fragment shader only shader outputs can be given explicit
2028 switch (state
->target
) {
2030 if (!global_scope
|| (var
->mode
!= ir_var_in
)) {
2036 case geometry_shader
:
2037 _mesa_glsl_error(loc
, state
,
2038 "geometry shader variables cannot be given "
2039 "explicit locations\n");
2042 case fragment_shader
:
2043 if (!global_scope
|| (var
->mode
!= ir_var_out
)) {
2051 _mesa_glsl_error(loc
, state
,
2052 "only %s shader %s variables can be given an "
2053 "explicit location\n",
2054 _mesa_glsl_shader_target_name(state
->target
),
2057 var
->explicit_location
= true;
2059 /* This bit of silliness is needed because invalid explicit locations
2060 * are supposed to be flagged during linking. Small negative values
2061 * biased by VERT_ATTRIB_GENERIC0 or FRAG_RESULT_DATA0 could alias
2062 * built-in values (e.g., -16+VERT_ATTRIB_GENERIC0 = VERT_ATTRIB_POS).
2063 * The linker needs to be able to differentiate these cases. This
2064 * ensures that negative values stay negative.
2066 if (qual
->location
>= 0) {
2067 var
->location
= (state
->target
== vertex_shader
)
2068 ? (qual
->location
+ VERT_ATTRIB_GENERIC0
)
2069 : (qual
->location
+ FRAG_RESULT_DATA0
);
2071 var
->location
= qual
->location
;
2076 /* Does the declaration use the 'layout' keyword?
2078 const bool uses_layout
= qual
->flags
.q
.pixel_center_integer
2079 || qual
->flags
.q
.origin_upper_left
2080 || qual
->flags
.q
.explicit_location
;
2082 /* Does the declaration use the deprecated 'attribute' or 'varying'
2085 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
2086 || qual
->flags
.q
.varying
;
2088 /* Is the 'layout' keyword used with parameters that allow relaxed checking.
2089 * Many implementations of GL_ARB_fragment_coord_conventions_enable and some
2090 * implementations (only Mesa?) GL_ARB_explicit_attrib_location_enable
2091 * allowed the layout qualifier to be used with 'varying' and 'attribute'.
2092 * These extensions and all following extensions that add the 'layout'
2093 * keyword have been modified to require the use of 'in' or 'out'.
2095 * The following extension do not allow the deprecated keywords:
2097 * GL_AMD_conservative_depth
2098 * GL_ARB_conservative_depth
2099 * GL_ARB_gpu_shader5
2100 * GL_ARB_separate_shader_objects
2101 * GL_ARB_tesselation_shader
2102 * GL_ARB_transform_feedback3
2103 * GL_ARB_uniform_buffer_object
2105 * It is unknown whether GL_EXT_shader_image_load_store or GL_NV_gpu_shader5
2106 * allow layout with the deprecated keywords.
2108 const bool relaxed_layout_qualifier_checking
=
2109 state
->ARB_fragment_coord_conventions_enable
;
2111 if (uses_layout
&& uses_deprecated_qualifier
) {
2112 if (relaxed_layout_qualifier_checking
) {
2113 _mesa_glsl_warning(loc
, state
,
2114 "`layout' qualifier may not be used with "
2115 "`attribute' or `varying'");
2117 _mesa_glsl_error(loc
, state
,
2118 "`layout' qualifier may not be used with "
2119 "`attribute' or `varying'");
2123 /* Layout qualifiers for gl_FragDepth, which are enabled by extension
2124 * AMD_conservative_depth.
2126 int depth_layout_count
= qual
->flags
.q
.depth_any
2127 + qual
->flags
.q
.depth_greater
2128 + qual
->flags
.q
.depth_less
2129 + qual
->flags
.q
.depth_unchanged
;
2130 if (depth_layout_count
> 0
2131 && !state
->AMD_conservative_depth_enable
2132 && !state
->ARB_conservative_depth_enable
) {
2133 _mesa_glsl_error(loc
, state
,
2134 "extension GL_AMD_conservative_depth or "
2135 "GL_ARB_conservative_depth must be enabled "
2136 "to use depth layout qualifiers");
2137 } else if (depth_layout_count
> 0
2138 && strcmp(var
->name
, "gl_FragDepth") != 0) {
2139 _mesa_glsl_error(loc
, state
,
2140 "depth layout qualifiers can be applied only to "
2142 } else if (depth_layout_count
> 1
2143 && strcmp(var
->name
, "gl_FragDepth") == 0) {
2144 _mesa_glsl_error(loc
, state
,
2145 "at most one depth layout qualifier can be applied to "
2148 if (qual
->flags
.q
.depth_any
)
2149 var
->depth_layout
= ir_depth_layout_any
;
2150 else if (qual
->flags
.q
.depth_greater
)
2151 var
->depth_layout
= ir_depth_layout_greater
;
2152 else if (qual
->flags
.q
.depth_less
)
2153 var
->depth_layout
= ir_depth_layout_less
;
2154 else if (qual
->flags
.q
.depth_unchanged
)
2155 var
->depth_layout
= ir_depth_layout_unchanged
;
2157 var
->depth_layout
= ir_depth_layout_none
;
2161 * Get the variable that is being redeclared by this declaration
2163 * Semantic checks to verify the validity of the redeclaration are also
2164 * performed. If semantic checks fail, compilation error will be emitted via
2165 * \c _mesa_glsl_error, but a non-\c NULL pointer will still be returned.
2168 * A pointer to an existing variable in the current scope if the declaration
2169 * is a redeclaration, \c NULL otherwise.
2172 get_variable_being_redeclared(ir_variable
*var
, ast_declaration
*decl
,
2173 struct _mesa_glsl_parse_state
*state
)
2175 /* Check if this declaration is actually a re-declaration, either to
2176 * resize an array or add qualifiers to an existing variable.
2178 * This is allowed for variables in the current scope, or when at
2179 * global scope (for built-ins in the implicit outer scope).
2181 ir_variable
*earlier
= state
->symbols
->get_variable(decl
->identifier
);
2182 if (earlier
== NULL
||
2183 (state
->current_function
!= NULL
&&
2184 !state
->symbols
->name_declared_this_scope(decl
->identifier
))) {
2189 YYLTYPE loc
= decl
->get_location();
2191 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec,
2193 * "It is legal to declare an array without a size and then
2194 * later re-declare the same name as an array of the same
2195 * type and specify a size."
2197 if ((earlier
->type
->array_size() == 0)
2198 && var
->type
->is_array()
2199 && (var
->type
->element_type() == earlier
->type
->element_type())) {
2200 /* FINISHME: This doesn't match the qualifiers on the two
2201 * FINISHME: declarations. It's not 100% clear whether this is
2202 * FINISHME: required or not.
2205 const unsigned size
= unsigned(var
->type
->array_size());
2206 check_builtin_array_max_size(var
->name
, size
, loc
, state
);
2207 if ((size
> 0) && (size
<= earlier
->max_array_access
)) {
2208 _mesa_glsl_error(& loc
, state
, "array size must be > %u due to "
2210 earlier
->max_array_access
);
2213 earlier
->type
= var
->type
;
2216 } else if (state
->ARB_fragment_coord_conventions_enable
2217 && strcmp(var
->name
, "gl_FragCoord") == 0
2218 && earlier
->type
== var
->type
2219 && earlier
->mode
== var
->mode
) {
2220 /* Allow redeclaration of gl_FragCoord for ARB_fcc layout
2223 earlier
->origin_upper_left
= var
->origin_upper_left
;
2224 earlier
->pixel_center_integer
= var
->pixel_center_integer
;
2226 /* According to section 4.3.7 of the GLSL 1.30 spec,
2227 * the following built-in varaibles can be redeclared with an
2228 * interpolation qualifier:
2231 * * gl_FrontSecondaryColor
2232 * * gl_BackSecondaryColor
2234 * * gl_SecondaryColor
2236 } else if (state
->language_version
>= 130
2237 && (strcmp(var
->name
, "gl_FrontColor") == 0
2238 || strcmp(var
->name
, "gl_BackColor") == 0
2239 || strcmp(var
->name
, "gl_FrontSecondaryColor") == 0
2240 || strcmp(var
->name
, "gl_BackSecondaryColor") == 0
2241 || strcmp(var
->name
, "gl_Color") == 0
2242 || strcmp(var
->name
, "gl_SecondaryColor") == 0)
2243 && earlier
->type
== var
->type
2244 && earlier
->mode
== var
->mode
) {
2245 earlier
->interpolation
= var
->interpolation
;
2247 /* Layout qualifiers for gl_FragDepth. */
2248 } else if ((state
->AMD_conservative_depth_enable
||
2249 state
->ARB_conservative_depth_enable
)
2250 && strcmp(var
->name
, "gl_FragDepth") == 0
2251 && earlier
->type
== var
->type
2252 && earlier
->mode
== var
->mode
) {
2254 /** From the AMD_conservative_depth spec:
2255 * Within any shader, the first redeclarations of gl_FragDepth
2256 * must appear before any use of gl_FragDepth.
2258 if (earlier
->used
) {
2259 _mesa_glsl_error(&loc
, state
,
2260 "the first redeclaration of gl_FragDepth "
2261 "must appear before any use of gl_FragDepth");
2264 /* Prevent inconsistent redeclaration of depth layout qualifier. */
2265 if (earlier
->depth_layout
!= ir_depth_layout_none
2266 && earlier
->depth_layout
!= var
->depth_layout
) {
2267 _mesa_glsl_error(&loc
, state
,
2268 "gl_FragDepth: depth layout is declared here "
2269 "as '%s, but it was previously declared as "
2271 depth_layout_string(var
->depth_layout
),
2272 depth_layout_string(earlier
->depth_layout
));
2275 earlier
->depth_layout
= var
->depth_layout
;
2278 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", decl
->identifier
);
2285 * Generate the IR for an initializer in a variable declaration
2288 process_initializer(ir_variable
*var
, ast_declaration
*decl
,
2289 ast_fully_specified_type
*type
,
2290 exec_list
*initializer_instructions
,
2291 struct _mesa_glsl_parse_state
*state
)
2293 ir_rvalue
*result
= NULL
;
2295 YYLTYPE initializer_loc
= decl
->initializer
->get_location();
2297 /* From page 24 (page 30 of the PDF) of the GLSL 1.10 spec:
2299 * "All uniform variables are read-only and are initialized either
2300 * directly by an application via API commands, or indirectly by
2303 if ((state
->language_version
<= 110)
2304 && (var
->mode
== ir_var_uniform
)) {
2305 _mesa_glsl_error(& initializer_loc
, state
,
2306 "cannot initialize uniforms in GLSL 1.10");
2309 if (var
->type
->is_sampler()) {
2310 _mesa_glsl_error(& initializer_loc
, state
,
2311 "cannot initialize samplers");
2314 if ((var
->mode
== ir_var_in
) && (state
->current_function
== NULL
)) {
2315 _mesa_glsl_error(& initializer_loc
, state
,
2316 "cannot initialize %s shader input / %s",
2317 _mesa_glsl_shader_target_name(state
->target
),
2318 (state
->target
== vertex_shader
)
2319 ? "attribute" : "varying");
2322 ir_dereference
*const lhs
= new(state
) ir_dereference_variable(var
);
2323 ir_rvalue
*rhs
= decl
->initializer
->hir(initializer_instructions
,
2326 /* Calculate the constant value if this is a const or uniform
2329 if (type
->qualifier
.flags
.q
.constant
2330 || type
->qualifier
.flags
.q
.uniform
) {
2331 ir_rvalue
*new_rhs
= validate_assignment(state
, var
->type
, rhs
, true);
2332 if (new_rhs
!= NULL
) {
2335 ir_constant
*constant_value
= rhs
->constant_expression_value();
2336 if (!constant_value
) {
2337 _mesa_glsl_error(& initializer_loc
, state
,
2338 "initializer of %s variable `%s' must be a "
2339 "constant expression",
2340 (type
->qualifier
.flags
.q
.constant
)
2341 ? "const" : "uniform",
2343 if (var
->type
->is_numeric()) {
2344 /* Reduce cascading errors. */
2345 var
->constant_value
= ir_constant::zero(state
, var
->type
);
2348 rhs
= constant_value
;
2349 var
->constant_value
= constant_value
;
2352 _mesa_glsl_error(&initializer_loc
, state
,
2353 "initializer of type %s cannot be assigned to "
2354 "variable of type %s",
2355 rhs
->type
->name
, var
->type
->name
);
2356 if (var
->type
->is_numeric()) {
2357 /* Reduce cascading errors. */
2358 var
->constant_value
= ir_constant::zero(state
, var
->type
);
2363 if (rhs
&& !rhs
->type
->is_error()) {
2364 bool temp
= var
->read_only
;
2365 if (type
->qualifier
.flags
.q
.constant
)
2366 var
->read_only
= false;
2368 /* Never emit code to initialize a uniform.
2370 const glsl_type
*initializer_type
;
2371 if (!type
->qualifier
.flags
.q
.uniform
) {
2372 result
= do_assignment(initializer_instructions
, state
,
2374 type
->get_location());
2375 initializer_type
= result
->type
;
2377 initializer_type
= rhs
->type
;
2379 var
->constant_initializer
= rhs
->constant_expression_value();
2380 var
->has_initializer
= true;
2382 /* If the declared variable is an unsized array, it must inherrit
2383 * its full type from the initializer. A declaration such as
2385 * uniform float a[] = float[](1.0, 2.0, 3.0, 3.0);
2389 * uniform float a[4] = float[](1.0, 2.0, 3.0, 3.0);
2391 * The assignment generated in the if-statement (below) will also
2392 * automatically handle this case for non-uniforms.
2394 * If the declared variable is not an array, the types must
2395 * already match exactly. As a result, the type assignment
2396 * here can be done unconditionally. For non-uniforms the call
2397 * to do_assignment can change the type of the initializer (via
2398 * the implicit conversion rules). For uniforms the initializer
2399 * must be a constant expression, and the type of that expression
2400 * was validated above.
2402 var
->type
= initializer_type
;
2404 var
->read_only
= temp
;
2411 ast_declarator_list::hir(exec_list
*instructions
,
2412 struct _mesa_glsl_parse_state
*state
)
2415 const struct glsl_type
*decl_type
;
2416 const char *type_name
= NULL
;
2417 ir_rvalue
*result
= NULL
;
2418 YYLTYPE loc
= this->get_location();
2420 /* From page 46 (page 52 of the PDF) of the GLSL 1.50 spec:
2422 * "To ensure that a particular output variable is invariant, it is
2423 * necessary to use the invariant qualifier. It can either be used to
2424 * qualify a previously declared variable as being invariant
2426 * invariant gl_Position; // make existing gl_Position be invariant"
2428 * In these cases the parser will set the 'invariant' flag in the declarator
2429 * list, and the type will be NULL.
2431 if (this->invariant
) {
2432 assert(this->type
== NULL
);
2434 if (state
->current_function
!= NULL
) {
2435 _mesa_glsl_error(& loc
, state
,
2436 "All uses of `invariant' keyword must be at global "
2440 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
2441 assert(!decl
->is_array
);
2442 assert(decl
->array_size
== NULL
);
2443 assert(decl
->initializer
== NULL
);
2445 ir_variable
*const earlier
=
2446 state
->symbols
->get_variable(decl
->identifier
);
2447 if (earlier
== NULL
) {
2448 _mesa_glsl_error(& loc
, state
,
2449 "Undeclared variable `%s' cannot be marked "
2450 "invariant\n", decl
->identifier
);
2451 } else if ((state
->target
== vertex_shader
)
2452 && (earlier
->mode
!= ir_var_out
)) {
2453 _mesa_glsl_error(& loc
, state
,
2454 "`%s' cannot be marked invariant, vertex shader "
2455 "outputs only\n", decl
->identifier
);
2456 } else if ((state
->target
== fragment_shader
)
2457 && (earlier
->mode
!= ir_var_in
)) {
2458 _mesa_glsl_error(& loc
, state
,
2459 "`%s' cannot be marked invariant, fragment shader "
2460 "inputs only\n", decl
->identifier
);
2461 } else if (earlier
->used
) {
2462 _mesa_glsl_error(& loc
, state
,
2463 "variable `%s' may not be redeclared "
2464 "`invariant' after being used",
2467 earlier
->invariant
= true;
2471 /* Invariant redeclarations do not have r-values.
2476 assert(this->type
!= NULL
);
2477 assert(!this->invariant
);
2479 /* The type specifier may contain a structure definition. Process that
2480 * before any of the variable declarations.
2482 (void) this->type
->specifier
->hir(instructions
, state
);
2484 decl_type
= this->type
->specifier
->glsl_type(& type_name
, state
);
2485 if (this->declarations
.is_empty()) {
2486 /* If there is no structure involved in the program text, there are two
2487 * possible scenarios:
2489 * - The program text contained something like 'vec4;'. This is an
2490 * empty declaration. It is valid but weird. Emit a warning.
2492 * - The program text contained something like 'S;' and 'S' is not the
2493 * name of a known structure type. This is both invalid and weird.
2496 * Note that if decl_type is NULL and there is a structure involved,
2497 * there must have been some sort of error with the structure. In this
2498 * case we assume that an error was already generated on this line of
2499 * code for the structure. There is no need to generate an additional,
2502 assert(this->type
->specifier
->structure
== NULL
|| decl_type
!= NULL
2504 if (this->type
->specifier
->structure
== NULL
) {
2505 if (decl_type
!= NULL
) {
2506 _mesa_glsl_warning(&loc
, state
, "empty declaration");
2508 _mesa_glsl_error(&loc
, state
,
2509 "invalid type `%s' in empty declaration",
2515 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
2516 const struct glsl_type
*var_type
;
2519 /* FINISHME: Emit a warning if a variable declaration shadows a
2520 * FINISHME: declaration at a higher scope.
2523 if ((decl_type
== NULL
) || decl_type
->is_void()) {
2524 if (type_name
!= NULL
) {
2525 _mesa_glsl_error(& loc
, state
,
2526 "invalid type `%s' in declaration of `%s'",
2527 type_name
, decl
->identifier
);
2529 _mesa_glsl_error(& loc
, state
,
2530 "invalid type in declaration of `%s'",
2536 if (decl
->is_array
) {
2537 var_type
= process_array_type(&loc
, decl_type
, decl
->array_size
,
2539 if (var_type
->is_error())
2542 var_type
= decl_type
;
2545 var
= new(ctx
) ir_variable(var_type
, decl
->identifier
, ir_var_auto
);
2547 /* From page 22 (page 28 of the PDF) of the GLSL 1.10 specification;
2549 * "Global variables can only use the qualifiers const,
2550 * attribute, uni form, or varying. Only one may be
2553 * Local variables can only use the qualifier const."
2555 * This is relaxed in GLSL 1.30. It is also relaxed by any extension
2556 * that adds the 'layout' keyword.
2558 if ((state
->language_version
< 130)
2559 && !state
->ARB_explicit_attrib_location_enable
2560 && !state
->ARB_fragment_coord_conventions_enable
) {
2561 if (this->type
->qualifier
.flags
.q
.out
) {
2562 _mesa_glsl_error(& loc
, state
,
2563 "`out' qualifier in declaration of `%s' "
2564 "only valid for function parameters in %s.",
2565 decl
->identifier
, state
->version_string
);
2567 if (this->type
->qualifier
.flags
.q
.in
) {
2568 _mesa_glsl_error(& loc
, state
,
2569 "`in' qualifier in declaration of `%s' "
2570 "only valid for function parameters in %s.",
2571 decl
->identifier
, state
->version_string
);
2573 /* FINISHME: Test for other invalid qualifiers. */
2576 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
,
2579 if (this->type
->qualifier
.flags
.q
.invariant
) {
2580 if ((state
->target
== vertex_shader
) && !(var
->mode
== ir_var_out
||
2581 var
->mode
== ir_var_inout
)) {
2582 /* FINISHME: Note that this doesn't work for invariant on
2583 * a function signature outval
2585 _mesa_glsl_error(& loc
, state
,
2586 "`%s' cannot be marked invariant, vertex shader "
2587 "outputs only\n", var
->name
);
2588 } else if ((state
->target
== fragment_shader
) &&
2589 !(var
->mode
== ir_var_in
|| var
->mode
== ir_var_inout
)) {
2590 /* FINISHME: Note that this doesn't work for invariant on
2591 * a function signature inval
2593 _mesa_glsl_error(& loc
, state
,
2594 "`%s' cannot be marked invariant, fragment shader "
2595 "inputs only\n", var
->name
);
2599 if (state
->current_function
!= NULL
) {
2600 const char *mode
= NULL
;
2601 const char *extra
= "";
2603 /* There is no need to check for 'inout' here because the parser will
2604 * only allow that in function parameter lists.
2606 if (this->type
->qualifier
.flags
.q
.attribute
) {
2608 } else if (this->type
->qualifier
.flags
.q
.uniform
) {
2610 } else if (this->type
->qualifier
.flags
.q
.varying
) {
2612 } else if (this->type
->qualifier
.flags
.q
.in
) {
2614 extra
= " or in function parameter list";
2615 } else if (this->type
->qualifier
.flags
.q
.out
) {
2617 extra
= " or in function parameter list";
2621 _mesa_glsl_error(& loc
, state
,
2622 "%s variable `%s' must be declared at "
2624 mode
, var
->name
, extra
);
2626 } else if (var
->mode
== ir_var_in
) {
2627 var
->read_only
= true;
2629 if (state
->target
== vertex_shader
) {
2630 bool error_emitted
= false;
2632 /* From page 31 (page 37 of the PDF) of the GLSL 1.50 spec:
2634 * "Vertex shader inputs can only be float, floating-point
2635 * vectors, matrices, signed and unsigned integers and integer
2636 * vectors. Vertex shader inputs can also form arrays of these
2637 * types, but not structures."
2639 * From page 31 (page 27 of the PDF) of the GLSL 1.30 spec:
2641 * "Vertex shader inputs can only be float, floating-point
2642 * vectors, matrices, signed and unsigned integers and integer
2643 * vectors. They cannot be arrays or structures."
2645 * From page 23 (page 29 of the PDF) of the GLSL 1.20 spec:
2647 * "The attribute qualifier can be used only with float,
2648 * floating-point vectors, and matrices. Attribute variables
2649 * cannot be declared as arrays or structures."
2651 const glsl_type
*check_type
= var
->type
->is_array()
2652 ? var
->type
->fields
.array
: var
->type
;
2654 switch (check_type
->base_type
) {
2655 case GLSL_TYPE_FLOAT
:
2657 case GLSL_TYPE_UINT
:
2659 if (state
->language_version
> 120)
2663 _mesa_glsl_error(& loc
, state
,
2664 "vertex shader input / attribute cannot have "
2666 var
->type
->is_array() ? "array of " : "",
2668 error_emitted
= true;
2671 if (!error_emitted
&& (state
->language_version
<= 130)
2672 && var
->type
->is_array()) {
2673 _mesa_glsl_error(& loc
, state
,
2674 "vertex shader input / attribute cannot have "
2676 error_emitted
= true;
2681 /* Integer vertex outputs must be qualified with 'flat'.
2683 * From section 4.3.6 of the GLSL 1.30 spec:
2684 * "If a vertex output is a signed or unsigned integer or integer
2685 * vector, then it must be qualified with the interpolation qualifier
2688 if (state
->language_version
>= 130
2689 && state
->target
== vertex_shader
2690 && state
->current_function
== NULL
2691 && var
->type
->is_integer()
2692 && var
->mode
== ir_var_out
2693 && var
->interpolation
!= INTERP_QUALIFIER_FLAT
) {
2695 _mesa_glsl_error(&loc
, state
, "If a vertex output is an integer, "
2696 "then it must be qualified with 'flat'");
2700 /* Interpolation qualifiers cannot be applied to 'centroid' and
2701 * 'centroid varying'.
2703 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
2704 * "interpolation qualifiers may only precede the qualifiers in,
2705 * centroid in, out, or centroid out in a declaration. They do not apply
2706 * to the deprecated storage qualifiers varying or centroid varying."
2708 if (state
->language_version
>= 130
2709 && this->type
->qualifier
.has_interpolation()
2710 && this->type
->qualifier
.flags
.q
.varying
) {
2712 const char *i
= this->type
->qualifier
.interpolation_string();
2715 if (this->type
->qualifier
.flags
.q
.centroid
)
2716 s
= "centroid varying";
2720 _mesa_glsl_error(&loc
, state
,
2721 "qualifier '%s' cannot be applied to the "
2722 "deprecated storage qualifier '%s'", i
, s
);
2726 /* Interpolation qualifiers can only apply to vertex shader outputs and
2727 * fragment shader inputs.
2729 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
2730 * "Outputs from a vertex shader (out) and inputs to a fragment
2731 * shader (in) can be further qualified with one or more of these
2732 * interpolation qualifiers"
2734 if (state
->language_version
>= 130
2735 && this->type
->qualifier
.has_interpolation()) {
2737 const char *i
= this->type
->qualifier
.interpolation_string();
2740 switch (state
->target
) {
2742 if (this->type
->qualifier
.flags
.q
.in
) {
2743 _mesa_glsl_error(&loc
, state
,
2744 "qualifier '%s' cannot be applied to vertex "
2745 "shader inputs", i
);
2748 case fragment_shader
:
2749 if (this->type
->qualifier
.flags
.q
.out
) {
2750 _mesa_glsl_error(&loc
, state
,
2751 "qualifier '%s' cannot be applied to fragment "
2752 "shader outputs", i
);
2761 /* From section 4.3.4 of the GLSL 1.30 spec:
2762 * "It is an error to use centroid in in a vertex shader."
2764 if (state
->language_version
>= 130
2765 && this->type
->qualifier
.flags
.q
.centroid
2766 && this->type
->qualifier
.flags
.q
.in
2767 && state
->target
== vertex_shader
) {
2769 _mesa_glsl_error(&loc
, state
,
2770 "'centroid in' cannot be used in a vertex shader");
2774 /* Precision qualifiers exists only in GLSL versions 1.00 and >= 1.30.
2776 if (this->type
->specifier
->precision
!= ast_precision_none
2777 && state
->language_version
!= 100
2778 && state
->language_version
< 130) {
2780 _mesa_glsl_error(&loc
, state
,
2781 "precision qualifiers are supported only in GLSL ES "
2782 "1.00, and GLSL 1.30 and later");
2786 /* Precision qualifiers only apply to floating point and integer types.
2788 * From section 4.5.2 of the GLSL 1.30 spec:
2789 * "Any floating point or any integer declaration can have the type
2790 * preceded by one of these precision qualifiers [...] Literal
2791 * constants do not have precision qualifiers. Neither do Boolean
2794 * In GLSL ES, sampler types are also allowed.
2796 * From page 87 of the GLSL ES spec:
2797 * "RESOLUTION: Allow sampler types to take a precision qualifier."
2799 if (this->type
->specifier
->precision
!= ast_precision_none
2800 && !var
->type
->is_float()
2801 && !var
->type
->is_integer()
2802 && !(var
->type
->is_sampler() && state
->es_shader
)
2803 && !(var
->type
->is_array()
2804 && (var
->type
->fields
.array
->is_float()
2805 || var
->type
->fields
.array
->is_integer()))) {
2807 _mesa_glsl_error(&loc
, state
,
2808 "precision qualifiers apply only to floating point"
2809 "%s types", state
->es_shader
? ", integer, and sampler"
2813 /* From page 17 (page 23 of the PDF) of the GLSL 1.20 spec:
2815 * "[Sampler types] can only be declared as function
2816 * parameters or uniform variables (see Section 4.3.5
2819 if (var_type
->contains_sampler() &&
2820 !this->type
->qualifier
.flags
.q
.uniform
) {
2821 _mesa_glsl_error(&loc
, state
, "samplers must be declared uniform");
2824 /* Process the initializer and add its instructions to a temporary
2825 * list. This list will be added to the instruction stream (below) after
2826 * the declaration is added. This is done because in some cases (such as
2827 * redeclarations) the declaration may not actually be added to the
2828 * instruction stream.
2830 exec_list initializer_instructions
;
2831 ir_variable
*earlier
= get_variable_being_redeclared(var
, decl
, state
);
2833 if (decl
->initializer
!= NULL
) {
2834 result
= process_initializer((earlier
== NULL
) ? var
: earlier
,
2836 &initializer_instructions
, state
);
2839 /* From page 23 (page 29 of the PDF) of the GLSL 1.10 spec:
2841 * "It is an error to write to a const variable outside of
2842 * its declaration, so they must be initialized when
2845 if (this->type
->qualifier
.flags
.q
.constant
&& decl
->initializer
== NULL
) {
2846 _mesa_glsl_error(& loc
, state
,
2847 "const declaration of `%s' must be initialized",
2851 /* If the declaration is not a redeclaration, there are a few additional
2852 * semantic checks that must be applied. In addition, variable that was
2853 * created for the declaration should be added to the IR stream.
2855 if (earlier
== NULL
) {
2856 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
2858 * "Identifiers starting with "gl_" are reserved for use by
2859 * OpenGL, and may not be declared in a shader as either a
2860 * variable or a function."
2862 if (strncmp(decl
->identifier
, "gl_", 3) == 0)
2863 _mesa_glsl_error(& loc
, state
,
2864 "identifier `%s' uses reserved `gl_' prefix",
2866 else if (strstr(decl
->identifier
, "__")) {
2867 /* From page 14 (page 20 of the PDF) of the GLSL 1.10
2870 * "In addition, all identifiers containing two
2871 * consecutive underscores (__) are reserved as
2872 * possible future keywords."
2874 _mesa_glsl_error(& loc
, state
,
2875 "identifier `%s' uses reserved `__' string",
2879 /* Add the variable to the symbol table. Note that the initializer's
2880 * IR was already processed earlier (though it hasn't been emitted
2881 * yet), without the variable in scope.
2883 * This differs from most C-like languages, but it follows the GLSL
2884 * specification. From page 28 (page 34 of the PDF) of the GLSL 1.50
2887 * "Within a declaration, the scope of a name starts immediately
2888 * after the initializer if present or immediately after the name
2889 * being declared if not."
2891 if (!state
->symbols
->add_variable(var
)) {
2892 YYLTYPE loc
= this->get_location();
2893 _mesa_glsl_error(&loc
, state
, "name `%s' already taken in the "
2894 "current scope", decl
->identifier
);
2898 /* Push the variable declaration to the top. It means that all the
2899 * variable declarations will appear in a funny last-to-first order,
2900 * but otherwise we run into trouble if a function is prototyped, a
2901 * global var is decled, then the function is defined with usage of
2902 * the global var. See glslparsertest's CorrectModule.frag.
2904 instructions
->push_head(var
);
2907 instructions
->append_list(&initializer_instructions
);
2911 /* Generally, variable declarations do not have r-values. However,
2912 * one is used for the declaration in
2914 * while (bool b = some_condition()) {
2918 * so we return the rvalue from the last seen declaration here.
2925 ast_parameter_declarator::hir(exec_list
*instructions
,
2926 struct _mesa_glsl_parse_state
*state
)
2929 const struct glsl_type
*type
;
2930 const char *name
= NULL
;
2931 YYLTYPE loc
= this->get_location();
2933 type
= this->type
->specifier
->glsl_type(& name
, state
);
2937 _mesa_glsl_error(& loc
, state
,
2938 "invalid type `%s' in declaration of `%s'",
2939 name
, this->identifier
);
2941 _mesa_glsl_error(& loc
, state
,
2942 "invalid type in declaration of `%s'",
2946 type
= glsl_type::error_type
;
2949 /* From page 62 (page 68 of the PDF) of the GLSL 1.50 spec:
2951 * "Functions that accept no input arguments need not use void in the
2952 * argument list because prototypes (or definitions) are required and
2953 * therefore there is no ambiguity when an empty argument list "( )" is
2954 * declared. The idiom "(void)" as a parameter list is provided for
2957 * Placing this check here prevents a void parameter being set up
2958 * for a function, which avoids tripping up checks for main taking
2959 * parameters and lookups of an unnamed symbol.
2961 if (type
->is_void()) {
2962 if (this->identifier
!= NULL
)
2963 _mesa_glsl_error(& loc
, state
,
2964 "named parameter cannot have type `void'");
2970 if (formal_parameter
&& (this->identifier
== NULL
)) {
2971 _mesa_glsl_error(& loc
, state
, "formal parameter lacks a name");
2975 /* This only handles "vec4 foo[..]". The earlier specifier->glsl_type(...)
2976 * call already handled the "vec4[..] foo" case.
2978 if (this->is_array
) {
2979 type
= process_array_type(&loc
, type
, this->array_size
, state
);
2982 if (!type
->is_error() && type
->array_size() == 0) {
2983 _mesa_glsl_error(&loc
, state
, "arrays passed as parameters must have "
2984 "a declared size.");
2985 type
= glsl_type::error_type
;
2989 ir_variable
*var
= new(ctx
) ir_variable(type
, this->identifier
, ir_var_in
);
2991 /* Apply any specified qualifiers to the parameter declaration. Note that
2992 * for function parameters the default mode is 'in'.
2994 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
, & loc
);
2996 /* From page 17 (page 23 of the PDF) of the GLSL 1.20 spec:
2998 * "Samplers cannot be treated as l-values; hence cannot be used
2999 * as out or inout function parameters, nor can they be assigned
3002 if ((var
->mode
== ir_var_inout
|| var
->mode
== ir_var_out
)
3003 && type
->contains_sampler()) {
3004 _mesa_glsl_error(&loc
, state
, "out and inout parameters cannot contain samplers");
3005 type
= glsl_type::error_type
;
3008 /* From page 39 (page 45 of the PDF) of the GLSL 1.10 spec:
3010 * "When calling a function, expressions that do not evaluate to
3011 * l-values cannot be passed to parameters declared as out or inout."
3013 * From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
3015 * "Other binary or unary expressions, non-dereferenced arrays,
3016 * function names, swizzles with repeated fields, and constants
3017 * cannot be l-values."
3019 * So for GLSL 1.10, passing an array as an out or inout parameter is not
3020 * allowed. This restriction is removed in GLSL 1.20, and in GLSL ES.
3022 if ((var
->mode
== ir_var_inout
|| var
->mode
== ir_var_out
)
3023 && type
->is_array() && state
->language_version
== 110) {
3024 _mesa_glsl_error(&loc
, state
, "Arrays cannot be out or inout parameters in GLSL 1.10");
3025 type
= glsl_type::error_type
;
3028 instructions
->push_tail(var
);
3030 /* Parameter declarations do not have r-values.
3037 ast_parameter_declarator::parameters_to_hir(exec_list
*ast_parameters
,
3039 exec_list
*ir_parameters
,
3040 _mesa_glsl_parse_state
*state
)
3042 ast_parameter_declarator
*void_param
= NULL
;
3045 foreach_list_typed (ast_parameter_declarator
, param
, link
, ast_parameters
) {
3046 param
->formal_parameter
= formal
;
3047 param
->hir(ir_parameters
, state
);
3055 if ((void_param
!= NULL
) && (count
> 1)) {
3056 YYLTYPE loc
= void_param
->get_location();
3058 _mesa_glsl_error(& loc
, state
,
3059 "`void' parameter must be only parameter");
3065 emit_function(_mesa_glsl_parse_state
*state
, ir_function
*f
)
3067 /* IR invariants disallow function declarations or definitions
3068 * nested within other function definitions. But there is no
3069 * requirement about the relative order of function declarations
3070 * and definitions with respect to one another. So simply insert
3071 * the new ir_function block at the end of the toplevel instruction
3074 state
->toplevel_ir
->push_tail(f
);
3079 ast_function::hir(exec_list
*instructions
,
3080 struct _mesa_glsl_parse_state
*state
)
3083 ir_function
*f
= NULL
;
3084 ir_function_signature
*sig
= NULL
;
3085 exec_list hir_parameters
;
3087 const char *const name
= identifier
;
3089 /* New functions are always added to the top-level IR instruction stream,
3090 * so this instruction list pointer is ignored. See also emit_function
3093 (void) instructions
;
3095 /* From page 21 (page 27 of the PDF) of the GLSL 1.20 spec,
3097 * "Function declarations (prototypes) cannot occur inside of functions;
3098 * they must be at global scope, or for the built-in functions, outside
3099 * the global scope."
3101 * From page 27 (page 33 of the PDF) of the GLSL ES 1.00.16 spec,
3103 * "User defined functions may only be defined within the global scope."
3105 * Note that this language does not appear in GLSL 1.10.
3107 if ((state
->current_function
!= NULL
) && (state
->language_version
!= 110)) {
3108 YYLTYPE loc
= this->get_location();
3109 _mesa_glsl_error(&loc
, state
,
3110 "declaration of function `%s' not allowed within "
3111 "function body", name
);
3114 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
3116 * "Identifiers starting with "gl_" are reserved for use by
3117 * OpenGL, and may not be declared in a shader as either a
3118 * variable or a function."
3120 if (strncmp(name
, "gl_", 3) == 0) {
3121 YYLTYPE loc
= this->get_location();
3122 _mesa_glsl_error(&loc
, state
,
3123 "identifier `%s' uses reserved `gl_' prefix", name
);
3126 /* Convert the list of function parameters to HIR now so that they can be
3127 * used below to compare this function's signature with previously seen
3128 * signatures for functions with the same name.
3130 ast_parameter_declarator::parameters_to_hir(& this->parameters
,
3132 & hir_parameters
, state
);
3134 const char *return_type_name
;
3135 const glsl_type
*return_type
=
3136 this->return_type
->specifier
->glsl_type(& return_type_name
, state
);
3139 YYLTYPE loc
= this->get_location();
3140 _mesa_glsl_error(&loc
, state
,
3141 "function `%s' has undeclared return type `%s'",
3142 name
, return_type_name
);
3143 return_type
= glsl_type::error_type
;
3146 /* From page 56 (page 62 of the PDF) of the GLSL 1.30 spec:
3147 * "No qualifier is allowed on the return type of a function."
3149 if (this->return_type
->has_qualifiers()) {
3150 YYLTYPE loc
= this->get_location();
3151 _mesa_glsl_error(& loc
, state
,
3152 "function `%s' return type has qualifiers", name
);
3155 /* From page 17 (page 23 of the PDF) of the GLSL 1.20 spec:
3157 * "[Sampler types] can only be declared as function parameters
3158 * or uniform variables (see Section 4.3.5 "Uniform")".
3160 if (return_type
->contains_sampler()) {
3161 YYLTYPE loc
= this->get_location();
3162 _mesa_glsl_error(&loc
, state
,
3163 "function `%s' return type can't contain a sampler",
3167 /* Verify that this function's signature either doesn't match a previously
3168 * seen signature for a function with the same name, or, if a match is found,
3169 * that the previously seen signature does not have an associated definition.
3171 f
= state
->symbols
->get_function(name
);
3172 if (f
!= NULL
&& (state
->es_shader
|| f
->has_user_signature())) {
3173 sig
= f
->exact_matching_signature(&hir_parameters
);
3175 const char *badvar
= sig
->qualifiers_match(&hir_parameters
);
3176 if (badvar
!= NULL
) {
3177 YYLTYPE loc
= this->get_location();
3179 _mesa_glsl_error(&loc
, state
, "function `%s' parameter `%s' "
3180 "qualifiers don't match prototype", name
, badvar
);
3183 if (sig
->return_type
!= return_type
) {
3184 YYLTYPE loc
= this->get_location();
3186 _mesa_glsl_error(&loc
, state
, "function `%s' return type doesn't "
3187 "match prototype", name
);
3190 if (is_definition
&& sig
->is_defined
) {
3191 YYLTYPE loc
= this->get_location();
3193 _mesa_glsl_error(& loc
, state
, "function `%s' redefined", name
);
3197 f
= new(ctx
) ir_function(name
);
3198 if (!state
->symbols
->add_function(f
)) {
3199 /* This function name shadows a non-function use of the same name. */
3200 YYLTYPE loc
= this->get_location();
3202 _mesa_glsl_error(&loc
, state
, "function name `%s' conflicts with "
3203 "non-function", name
);
3207 emit_function(state
, f
);
3210 /* Verify the return type of main() */
3211 if (strcmp(name
, "main") == 0) {
3212 if (! return_type
->is_void()) {
3213 YYLTYPE loc
= this->get_location();
3215 _mesa_glsl_error(& loc
, state
, "main() must return void");
3218 if (!hir_parameters
.is_empty()) {
3219 YYLTYPE loc
= this->get_location();
3221 _mesa_glsl_error(& loc
, state
, "main() must not take any parameters");
3225 /* Finish storing the information about this new function in its signature.
3228 sig
= new(ctx
) ir_function_signature(return_type
);
3229 f
->add_signature(sig
);
3232 sig
->replace_parameters(&hir_parameters
);
3235 /* Function declarations (prototypes) do not have r-values.
3242 ast_function_definition::hir(exec_list
*instructions
,
3243 struct _mesa_glsl_parse_state
*state
)
3245 prototype
->is_definition
= true;
3246 prototype
->hir(instructions
, state
);
3248 ir_function_signature
*signature
= prototype
->signature
;
3249 if (signature
== NULL
)
3252 assert(state
->current_function
== NULL
);
3253 state
->current_function
= signature
;
3254 state
->found_return
= false;
3256 /* Duplicate parameters declared in the prototype as concrete variables.
3257 * Add these to the symbol table.
3259 state
->symbols
->push_scope();
3260 foreach_iter(exec_list_iterator
, iter
, signature
->parameters
) {
3261 ir_variable
*const var
= ((ir_instruction
*) iter
.get())->as_variable();
3263 assert(var
!= NULL
);
3265 /* The only way a parameter would "exist" is if two parameters have
3268 if (state
->symbols
->name_declared_this_scope(var
->name
)) {
3269 YYLTYPE loc
= this->get_location();
3271 _mesa_glsl_error(& loc
, state
, "parameter `%s' redeclared", var
->name
);
3273 state
->symbols
->add_variable(var
);
3277 /* Convert the body of the function to HIR. */
3278 this->body
->hir(&signature
->body
, state
);
3279 signature
->is_defined
= true;
3281 state
->symbols
->pop_scope();
3283 assert(state
->current_function
== signature
);
3284 state
->current_function
= NULL
;
3286 if (!signature
->return_type
->is_void() && !state
->found_return
) {
3287 YYLTYPE loc
= this->get_location();
3288 _mesa_glsl_error(& loc
, state
, "function `%s' has non-void return type "
3289 "%s, but no return statement",
3290 signature
->function_name(),
3291 signature
->return_type
->name
);
3294 /* Function definitions do not have r-values.
3301 ast_jump_statement::hir(exec_list
*instructions
,
3302 struct _mesa_glsl_parse_state
*state
)
3309 assert(state
->current_function
);
3311 if (opt_return_value
) {
3312 ir_rvalue
*const ret
= opt_return_value
->hir(instructions
, state
);
3314 /* The value of the return type can be NULL if the shader says
3315 * 'return foo();' and foo() is a function that returns void.
3317 * NOTE: The GLSL spec doesn't say that this is an error. The type
3318 * of the return value is void. If the return type of the function is
3319 * also void, then this should compile without error. Seriously.
3321 const glsl_type
*const ret_type
=
3322 (ret
== NULL
) ? glsl_type::void_type
: ret
->type
;
3324 /* Implicit conversions are not allowed for return values. */
3325 if (state
->current_function
->return_type
!= ret_type
) {
3326 YYLTYPE loc
= this->get_location();
3328 _mesa_glsl_error(& loc
, state
,
3329 "`return' with wrong type %s, in function `%s' "
3332 state
->current_function
->function_name(),
3333 state
->current_function
->return_type
->name
);
3336 inst
= new(ctx
) ir_return(ret
);
3338 if (state
->current_function
->return_type
->base_type
!=
3340 YYLTYPE loc
= this->get_location();
3342 _mesa_glsl_error(& loc
, state
,
3343 "`return' with no value, in function %s returning "
3345 state
->current_function
->function_name());
3347 inst
= new(ctx
) ir_return
;
3350 state
->found_return
= true;
3351 instructions
->push_tail(inst
);
3356 if (state
->target
!= fragment_shader
) {
3357 YYLTYPE loc
= this->get_location();
3359 _mesa_glsl_error(& loc
, state
,
3360 "`discard' may only appear in a fragment shader");
3362 instructions
->push_tail(new(ctx
) ir_discard
);
3367 if (mode
== ast_continue
&&
3368 state
->loop_nesting_ast
== NULL
) {
3369 YYLTYPE loc
= this->get_location();
3371 _mesa_glsl_error(& loc
, state
,
3372 "continue may only appear in a loop");
3373 } else if (mode
== ast_break
&&
3374 state
->loop_nesting_ast
== NULL
&&
3375 state
->switch_nesting_ast
== NULL
) {
3376 YYLTYPE loc
= this->get_location();
3378 _mesa_glsl_error(& loc
, state
,
3379 "break may only appear in a loop or a switch");
3381 /* For a loop, inline the for loop expression again,
3382 * since we don't know where near the end of
3383 * the loop body the normal copy of it
3384 * is going to be placed.
3386 if (state
->loop_nesting_ast
!= NULL
&&
3387 mode
== ast_continue
&&
3388 state
->loop_nesting_ast
->rest_expression
) {
3389 state
->loop_nesting_ast
->rest_expression
->hir(instructions
,
3393 if (state
->is_switch_innermost
&&
3394 mode
== ast_break
) {
3395 /* Force break out of switch by setting is_break switch state.
3397 ir_variable
*const is_break_var
= state
->is_break_var
;
3398 ir_dereference_variable
*const deref_is_break_var
=
3399 new(ctx
) ir_dereference_variable(is_break_var
);
3400 ir_constant
*const true_val
= new(ctx
) ir_constant(true);
3401 ir_assignment
*const set_break_var
=
3402 new(ctx
) ir_assignment(deref_is_break_var
,
3406 instructions
->push_tail(set_break_var
);
3409 ir_loop_jump
*const jump
=
3410 new(ctx
) ir_loop_jump((mode
== ast_break
)
3411 ? ir_loop_jump::jump_break
3412 : ir_loop_jump::jump_continue
);
3413 instructions
->push_tail(jump
);
3420 /* Jump instructions do not have r-values.
3427 ast_selection_statement::hir(exec_list
*instructions
,
3428 struct _mesa_glsl_parse_state
*state
)
3432 ir_rvalue
*const condition
= this->condition
->hir(instructions
, state
);
3434 /* From page 66 (page 72 of the PDF) of the GLSL 1.50 spec:
3436 * "Any expression whose type evaluates to a Boolean can be used as the
3437 * conditional expression bool-expression. Vector types are not accepted
3438 * as the expression to if."
3440 * The checks are separated so that higher quality diagnostics can be
3441 * generated for cases where both rules are violated.
3443 if (!condition
->type
->is_boolean() || !condition
->type
->is_scalar()) {
3444 YYLTYPE loc
= this->condition
->get_location();
3446 _mesa_glsl_error(& loc
, state
, "if-statement condition must be scalar "
3450 ir_if
*const stmt
= new(ctx
) ir_if(condition
);
3452 if (then_statement
!= NULL
) {
3453 state
->symbols
->push_scope();
3454 then_statement
->hir(& stmt
->then_instructions
, state
);
3455 state
->symbols
->pop_scope();
3458 if (else_statement
!= NULL
) {
3459 state
->symbols
->push_scope();
3460 else_statement
->hir(& stmt
->else_instructions
, state
);
3461 state
->symbols
->pop_scope();
3464 instructions
->push_tail(stmt
);
3466 /* if-statements do not have r-values.
3473 ast_switch_statement::hir(exec_list
*instructions
,
3474 struct _mesa_glsl_parse_state
*state
)
3478 ir_rvalue
*const test_expression
=
3479 this->test_expression
->hir(instructions
, state
);
3481 /* From page 66 (page 55 of the PDF) of the GLSL 1.50 spec:
3483 * "The type of init-expression in a switch statement must be a
3486 * The checks are separated so that higher quality diagnostics can be
3487 * generated for cases where the rule is violated.
3489 if (!test_expression
->type
->is_integer()) {
3490 YYLTYPE loc
= this->test_expression
->get_location();
3492 _mesa_glsl_error(& loc
,
3494 "switch-statement expression must be scalar "
3498 /* Track the switch-statement nesting in a stack-like manner.
3500 ir_variable
*saved_test_var
= state
->test_var
;
3501 ir_variable
*saved_is_fallthru_var
= state
->is_fallthru_var
;
3503 bool save_is_switch_innermost
= state
->is_switch_innermost
;
3504 ast_switch_statement
*saved_nesting_ast
= state
->switch_nesting_ast
;
3506 state
->is_switch_innermost
= true;
3507 state
->switch_nesting_ast
= this;
3509 /* Initalize is_fallthru state to false.
3511 ir_rvalue
*const is_fallthru_val
= new (ctx
) ir_constant(false);
3512 state
->is_fallthru_var
= new(ctx
) ir_variable(glsl_type::bool_type
,
3513 "switch_is_fallthru_tmp",
3515 instructions
->push_tail(state
->is_fallthru_var
);
3517 ir_dereference_variable
*deref_is_fallthru_var
=
3518 new(ctx
) ir_dereference_variable(state
->is_fallthru_var
);
3519 instructions
->push_tail(new(ctx
) ir_assignment(deref_is_fallthru_var
,
3523 /* Initalize is_break state to false.
3525 ir_rvalue
*const is_break_val
= new (ctx
) ir_constant(false);
3526 state
->is_break_var
= new(ctx
) ir_variable(glsl_type::bool_type
,
3527 "switch_is_break_tmp",
3529 instructions
->push_tail(state
->is_break_var
);
3531 ir_dereference_variable
*deref_is_break_var
=
3532 new(ctx
) ir_dereference_variable(state
->is_break_var
);
3533 instructions
->push_tail(new(ctx
) ir_assignment(deref_is_break_var
,
3537 /* Cache test expression.
3539 test_to_hir(instructions
, state
);
3541 /* Emit code for body of switch stmt.
3543 body
->hir(instructions
, state
);
3545 /* Restore previous nesting before returning.
3547 state
->switch_nesting_ast
= saved_nesting_ast
;
3548 state
->is_switch_innermost
= save_is_switch_innermost
;
3550 state
->test_var
= saved_test_var
;
3551 state
->is_fallthru_var
= saved_is_fallthru_var
;
3553 /* Switch statements do not have r-values.
3560 ast_switch_statement::test_to_hir(exec_list
*instructions
,
3561 struct _mesa_glsl_parse_state
*state
)
3565 /* Cache value of test expression.
3567 ir_rvalue
*const test_val
=
3568 test_expression
->hir(instructions
,
3571 state
->test_var
= new(ctx
) ir_variable(glsl_type::int_type
,
3574 ir_dereference_variable
*deref_test_var
=
3575 new(ctx
) ir_dereference_variable(state
->test_var
);
3577 instructions
->push_tail(state
->test_var
);
3578 instructions
->push_tail(new(ctx
) ir_assignment(deref_test_var
,
3585 ast_switch_body::hir(exec_list
*instructions
,
3586 struct _mesa_glsl_parse_state
*state
)
3589 stmts
->hir(instructions
, state
);
3591 /* Switch bodies do not have r-values.
3598 ast_case_statement_list::hir(exec_list
*instructions
,
3599 struct _mesa_glsl_parse_state
*state
)
3601 foreach_list_typed (ast_case_statement
, case_stmt
, link
, & this->cases
)
3602 case_stmt
->hir(instructions
, state
);
3604 /* Case statements do not have r-values.
3611 ast_case_statement::hir(exec_list
*instructions
,
3612 struct _mesa_glsl_parse_state
*state
)
3614 labels
->hir(instructions
, state
);
3616 /* Conditionally set fallthru state based on break state.
3618 ir_constant
*const false_val
= new(state
) ir_constant(false);
3619 ir_dereference_variable
*const deref_is_fallthru_var
=
3620 new(state
) ir_dereference_variable(state
->is_fallthru_var
);
3621 ir_dereference_variable
*const deref_is_break_var
=
3622 new(state
) ir_dereference_variable(state
->is_break_var
);
3623 ir_assignment
*const reset_fallthru_on_break
=
3624 new(state
) ir_assignment(deref_is_fallthru_var
,
3626 deref_is_break_var
);
3627 instructions
->push_tail(reset_fallthru_on_break
);
3629 /* Guard case statements depending on fallthru state.
3631 ir_dereference_variable
*const deref_fallthru_guard
=
3632 new(state
) ir_dereference_variable(state
->is_fallthru_var
);
3633 ir_if
*const test_fallthru
= new(state
) ir_if(deref_fallthru_guard
);
3635 foreach_list_typed (ast_node
, stmt
, link
, & this->stmts
)
3636 stmt
->hir(& test_fallthru
->then_instructions
, state
);
3638 instructions
->push_tail(test_fallthru
);
3640 /* Case statements do not have r-values.
3647 ast_case_label_list::hir(exec_list
*instructions
,
3648 struct _mesa_glsl_parse_state
*state
)
3650 foreach_list_typed (ast_case_label
, label
, link
, & this->labels
)
3651 label
->hir(instructions
, state
);
3653 /* Case labels do not have r-values.
3660 ast_case_label::hir(exec_list
*instructions
,
3661 struct _mesa_glsl_parse_state
*state
)
3665 ir_dereference_variable
*deref_fallthru_var
=
3666 new(ctx
) ir_dereference_variable(state
->is_fallthru_var
);
3668 ir_rvalue
*const true_val
= new(ctx
) ir_constant(true);
3670 /* If not default case, ...
3672 if (this->test_value
!= NULL
) {
3673 /* Conditionally set fallthru state based on
3674 * comparison of cached test expression value to case label.
3676 ir_rvalue
*const test_val
= this->test_value
->hir(instructions
, state
);
3678 ir_dereference_variable
*deref_test_var
=
3679 new(ctx
) ir_dereference_variable(state
->test_var
);
3681 ir_rvalue
*const test_cond
= new(ctx
) ir_expression(ir_binop_all_equal
,
3682 glsl_type::bool_type
,
3686 ir_assignment
*set_fallthru_on_test
=
3687 new(ctx
) ir_assignment(deref_fallthru_var
,
3691 instructions
->push_tail(set_fallthru_on_test
);
3692 } else { /* default case */
3693 /* Set falltrhu state.
3695 ir_assignment
*set_fallthru
=
3696 new(ctx
) ir_assignment(deref_fallthru_var
,
3700 instructions
->push_tail(set_fallthru
);
3703 /* Case statements do not have r-values.
3710 ast_iteration_statement::condition_to_hir(ir_loop
*stmt
,
3711 struct _mesa_glsl_parse_state
*state
)
3715 if (condition
!= NULL
) {
3716 ir_rvalue
*const cond
=
3717 condition
->hir(& stmt
->body_instructions
, state
);
3720 || !cond
->type
->is_boolean() || !cond
->type
->is_scalar()) {
3721 YYLTYPE loc
= condition
->get_location();
3723 _mesa_glsl_error(& loc
, state
,
3724 "loop condition must be scalar boolean");
3726 /* As the first code in the loop body, generate a block that looks
3727 * like 'if (!condition) break;' as the loop termination condition.
3729 ir_rvalue
*const not_cond
=
3730 new(ctx
) ir_expression(ir_unop_logic_not
, glsl_type::bool_type
, cond
,
3733 ir_if
*const if_stmt
= new(ctx
) ir_if(not_cond
);
3735 ir_jump
*const break_stmt
=
3736 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
3738 if_stmt
->then_instructions
.push_tail(break_stmt
);
3739 stmt
->body_instructions
.push_tail(if_stmt
);
3746 ast_iteration_statement::hir(exec_list
*instructions
,
3747 struct _mesa_glsl_parse_state
*state
)
3751 /* For-loops and while-loops start a new scope, but do-while loops do not.
3753 if (mode
!= ast_do_while
)
3754 state
->symbols
->push_scope();
3756 if (init_statement
!= NULL
)
3757 init_statement
->hir(instructions
, state
);
3759 ir_loop
*const stmt
= new(ctx
) ir_loop();
3760 instructions
->push_tail(stmt
);
3762 /* Track the current loop nesting.
3764 ast_iteration_statement
*nesting_ast
= state
->loop_nesting_ast
;
3766 state
->loop_nesting_ast
= this;
3768 /* Likewise, indicate that following code is closest to a loop,
3769 * NOT closest to a switch.
3771 bool saved_is_switch_innermost
= state
->is_switch_innermost
;
3772 state
->is_switch_innermost
= false;
3774 if (mode
!= ast_do_while
)
3775 condition_to_hir(stmt
, state
);
3778 body
->hir(& stmt
->body_instructions
, state
);
3780 if (rest_expression
!= NULL
)
3781 rest_expression
->hir(& stmt
->body_instructions
, state
);
3783 if (mode
== ast_do_while
)
3784 condition_to_hir(stmt
, state
);
3786 if (mode
!= ast_do_while
)
3787 state
->symbols
->pop_scope();
3789 /* Restore previous nesting before returning.
3791 state
->loop_nesting_ast
= nesting_ast
;
3792 state
->is_switch_innermost
= saved_is_switch_innermost
;
3794 /* Loops do not have r-values.
3801 ast_type_specifier::hir(exec_list
*instructions
,
3802 struct _mesa_glsl_parse_state
*state
)
3804 if (!this->is_precision_statement
&& this->structure
== NULL
)
3807 YYLTYPE loc
= this->get_location();
3809 if (this->precision
!= ast_precision_none
3810 && state
->language_version
!= 100
3811 && state
->language_version
< 130) {
3812 _mesa_glsl_error(&loc
, state
,
3813 "precision qualifiers exist only in "
3814 "GLSL ES 1.00, and GLSL 1.30 and later");
3817 if (this->precision
!= ast_precision_none
3818 && this->structure
!= NULL
) {
3819 _mesa_glsl_error(&loc
, state
,
3820 "precision qualifiers do not apply to structures");
3824 /* If this is a precision statement, check that the type to which it is
3825 * applied is either float or int.
3827 * From section 4.5.3 of the GLSL 1.30 spec:
3828 * "The precision statement
3829 * precision precision-qualifier type;
3830 * can be used to establish a default precision qualifier. The type
3831 * field can be either int or float [...]. Any other types or
3832 * qualifiers will result in an error.
3834 if (this->is_precision_statement
) {
3835 assert(this->precision
!= ast_precision_none
);
3836 assert(this->structure
== NULL
); /* The check for structures was
3837 * performed above. */
3838 if (this->is_array
) {
3839 _mesa_glsl_error(&loc
, state
,
3840 "default precision statements do not apply to "
3844 if (this->type_specifier
!= ast_float
3845 && this->type_specifier
!= ast_int
) {
3846 _mesa_glsl_error(&loc
, state
,
3847 "default precision statements apply only to types "
3852 /* FINISHME: Translate precision statements into IR. */
3856 if (this->structure
!= NULL
)
3857 return this->structure
->hir(instructions
, state
);
3864 ast_struct_specifier::hir(exec_list
*instructions
,
3865 struct _mesa_glsl_parse_state
*state
)
3867 unsigned decl_count
= 0;
3869 /* Make an initial pass over the list of structure fields to determine how
3870 * many there are. Each element in this list is an ast_declarator_list.
3871 * This means that we actually need to count the number of elements in the
3872 * 'declarations' list in each of the elements.
3874 foreach_list_typed (ast_declarator_list
, decl_list
, link
,
3875 &this->declarations
) {
3876 foreach_list_const (decl_ptr
, & decl_list
->declarations
) {
3881 /* Allocate storage for the structure fields and process the field
3882 * declarations. As the declarations are processed, try to also convert
3883 * the types to HIR. This ensures that structure definitions embedded in
3884 * other structure definitions are processed.
3886 glsl_struct_field
*const fields
= ralloc_array(state
, glsl_struct_field
,
3890 foreach_list_typed (ast_declarator_list
, decl_list
, link
,
3891 &this->declarations
) {
3892 const char *type_name
;
3894 decl_list
->type
->specifier
->hir(instructions
, state
);
3896 /* Section 10.9 of the GLSL ES 1.00 specification states that
3897 * embedded structure definitions have been removed from the language.
3899 if (state
->es_shader
&& decl_list
->type
->specifier
->structure
!= NULL
) {
3900 YYLTYPE loc
= this->get_location();
3901 _mesa_glsl_error(&loc
, state
, "Embedded structure definitions are "
3902 "not allowed in GLSL ES 1.00.");
3905 const glsl_type
*decl_type
=
3906 decl_list
->type
->specifier
->glsl_type(& type_name
, state
);
3908 foreach_list_typed (ast_declaration
, decl
, link
,
3909 &decl_list
->declarations
) {
3910 const struct glsl_type
*field_type
= decl_type
;
3911 if (decl
->is_array
) {
3912 YYLTYPE loc
= decl
->get_location();
3913 field_type
= process_array_type(&loc
, decl_type
, decl
->array_size
,
3916 fields
[i
].type
= (field_type
!= NULL
)
3917 ? field_type
: glsl_type::error_type
;
3918 fields
[i
].name
= decl
->identifier
;
3923 assert(i
== decl_count
);
3925 const glsl_type
*t
=
3926 glsl_type::get_record_instance(fields
, decl_count
, this->name
);
3928 YYLTYPE loc
= this->get_location();
3929 if (!state
->symbols
->add_type(name
, t
)) {
3930 _mesa_glsl_error(& loc
, state
, "struct `%s' previously defined", name
);
3932 const glsl_type
**s
= reralloc(state
, state
->user_structures
,
3934 state
->num_user_structures
+ 1);
3936 s
[state
->num_user_structures
] = t
;
3937 state
->user_structures
= s
;
3938 state
->num_user_structures
++;
3942 /* Structure type definitions do not have r-values.