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 ast_expression::hir(exec_list
*instructions
,
940 struct _mesa_glsl_parse_state
*state
)
943 static const int operations
[AST_NUM_OPERATORS
] = {
944 -1, /* ast_assign doesn't convert to ir_expression. */
945 -1, /* ast_plus doesn't convert to ir_expression. */
969 /* Note: The following block of expression types actually convert
970 * to multiple IR instructions.
972 ir_binop_mul
, /* ast_mul_assign */
973 ir_binop_div
, /* ast_div_assign */
974 ir_binop_mod
, /* ast_mod_assign */
975 ir_binop_add
, /* ast_add_assign */
976 ir_binop_sub
, /* ast_sub_assign */
977 ir_binop_lshift
, /* ast_ls_assign */
978 ir_binop_rshift
, /* ast_rs_assign */
979 ir_binop_bit_and
, /* ast_and_assign */
980 ir_binop_bit_xor
, /* ast_xor_assign */
981 ir_binop_bit_or
, /* ast_or_assign */
983 -1, /* ast_conditional doesn't convert to ir_expression. */
984 ir_binop_add
, /* ast_pre_inc. */
985 ir_binop_sub
, /* ast_pre_dec. */
986 ir_binop_add
, /* ast_post_inc. */
987 ir_binop_sub
, /* ast_post_dec. */
988 -1, /* ast_field_selection doesn't conv to ir_expression. */
989 -1, /* ast_array_index doesn't convert to ir_expression. */
990 -1, /* ast_function_call doesn't conv to ir_expression. */
991 -1, /* ast_identifier doesn't convert to ir_expression. */
992 -1, /* ast_int_constant doesn't convert to ir_expression. */
993 -1, /* ast_uint_constant doesn't conv to ir_expression. */
994 -1, /* ast_float_constant doesn't conv to ir_expression. */
995 -1, /* ast_bool_constant doesn't conv to ir_expression. */
996 -1, /* ast_sequence doesn't convert to ir_expression. */
998 ir_rvalue
*result
= NULL
;
1000 const struct glsl_type
*type
; /* a temporary variable for switch cases */
1001 bool error_emitted
= false;
1004 loc
= this->get_location();
1006 switch (this->oper
) {
1008 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1009 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1011 result
= do_assignment(instructions
, state
, op
[0], op
[1], false,
1012 this->subexpressions
[0]->get_location());
1013 error_emitted
= result
->type
->is_error();
1018 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1020 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1022 error_emitted
= type
->is_error();
1028 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1030 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1032 error_emitted
= type
->is_error();
1034 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1042 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1043 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1045 type
= arithmetic_result_type(op
[0], op
[1],
1046 (this->oper
== ast_mul
),
1048 error_emitted
= type
->is_error();
1050 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1055 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1056 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1058 type
= modulus_result_type(op
[0]->type
, op
[1]->type
, state
, & loc
);
1060 assert(operations
[this->oper
] == ir_binop_mod
);
1062 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1064 error_emitted
= type
->is_error();
1069 if (state
->language_version
< 130) {
1070 _mesa_glsl_error(&loc
, state
, "operator %s requires GLSL 1.30",
1071 operator_string(this->oper
));
1072 error_emitted
= true;
1075 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1076 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1077 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1079 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1081 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1088 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1089 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1091 type
= relational_result_type(op
[0], op
[1], state
, & loc
);
1093 /* The relational operators must either generate an error or result
1094 * in a scalar boolean. See page 57 of the GLSL 1.50 spec.
1096 assert(type
->is_error()
1097 || ((type
->base_type
== GLSL_TYPE_BOOL
)
1098 && type
->is_scalar()));
1100 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1102 error_emitted
= type
->is_error();
1107 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1108 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1110 /* From page 58 (page 64 of the PDF) of the GLSL 1.50 spec:
1112 * "The equality operators equal (==), and not equal (!=)
1113 * operate on all types. They result in a scalar Boolean. If
1114 * the operand types do not match, then there must be a
1115 * conversion from Section 4.1.10 "Implicit Conversions"
1116 * applied to one operand that can make them match, in which
1117 * case this conversion is done."
1119 if ((!apply_implicit_conversion(op
[0]->type
, op
[1], state
)
1120 && !apply_implicit_conversion(op
[1]->type
, op
[0], state
))
1121 || (op
[0]->type
!= op
[1]->type
)) {
1122 _mesa_glsl_error(& loc
, state
, "operands of `%s' must have the same "
1123 "type", (this->oper
== ast_equal
) ? "==" : "!=");
1124 error_emitted
= true;
1125 } else if ((state
->language_version
<= 110)
1126 && (op
[0]->type
->is_array() || op
[1]->type
->is_array())) {
1127 _mesa_glsl_error(& loc
, state
, "array comparisons forbidden in "
1129 error_emitted
= true;
1132 if (error_emitted
) {
1133 result
= new(ctx
) ir_constant(false);
1135 result
= do_comparison(ctx
, operations
[this->oper
], op
[0], op
[1]);
1136 assert(result
->type
== glsl_type::bool_type
);
1143 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1144 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1145 type
= bit_logic_result_type(op
[0]->type
, op
[1]->type
, this->oper
,
1147 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1149 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1153 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1155 if (state
->language_version
< 130) {
1156 _mesa_glsl_error(&loc
, state
, "bit-wise operations require GLSL 1.30");
1157 error_emitted
= true;
1160 if (!op
[0]->type
->is_integer()) {
1161 _mesa_glsl_error(&loc
, state
, "operand of `~' must be an integer");
1162 error_emitted
= true;
1166 result
= new(ctx
) ir_expression(ir_unop_bit_not
, type
, op
[0], NULL
);
1169 case ast_logic_and
: {
1170 exec_list rhs_instructions
;
1171 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1172 "LHS", &error_emitted
);
1173 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1174 "RHS", &error_emitted
);
1176 ir_constant
*op0_const
= op
[0]->constant_expression_value();
1178 if (op0_const
->value
.b
[0]) {
1179 instructions
->append_list(&rhs_instructions
);
1184 type
= glsl_type::bool_type
;
1186 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1189 instructions
->push_tail(tmp
);
1191 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1192 instructions
->push_tail(stmt
);
1194 stmt
->then_instructions
.append_list(&rhs_instructions
);
1195 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1196 ir_assignment
*const then_assign
=
1197 new(ctx
) ir_assignment(then_deref
, op
[1], NULL
);
1198 stmt
->then_instructions
.push_tail(then_assign
);
1200 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1201 ir_assignment
*const else_assign
=
1202 new(ctx
) ir_assignment(else_deref
, new(ctx
) ir_constant(false), NULL
);
1203 stmt
->else_instructions
.push_tail(else_assign
);
1205 result
= new(ctx
) ir_dereference_variable(tmp
);
1211 case ast_logic_or
: {
1212 exec_list rhs_instructions
;
1213 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1214 "LHS", &error_emitted
);
1215 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1216 "RHS", &error_emitted
);
1218 ir_constant
*op0_const
= op
[0]->constant_expression_value();
1220 if (op0_const
->value
.b
[0]) {
1225 type
= glsl_type::bool_type
;
1227 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1230 instructions
->push_tail(tmp
);
1232 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1233 instructions
->push_tail(stmt
);
1235 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1236 ir_assignment
*const then_assign
=
1237 new(ctx
) ir_assignment(then_deref
, new(ctx
) ir_constant(true), NULL
);
1238 stmt
->then_instructions
.push_tail(then_assign
);
1240 stmt
->else_instructions
.append_list(&rhs_instructions
);
1241 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1242 ir_assignment
*const else_assign
=
1243 new(ctx
) ir_assignment(else_deref
, op
[1], NULL
);
1244 stmt
->else_instructions
.push_tail(else_assign
);
1246 result
= new(ctx
) ir_dereference_variable(tmp
);
1253 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1255 * "The logical binary operators and (&&), or ( | | ), and
1256 * exclusive or (^^). They operate only on two Boolean
1257 * expressions and result in a Boolean expression."
1259 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0, "LHS",
1261 op
[1] = get_scalar_boolean_operand(instructions
, state
, this, 1, "RHS",
1264 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1269 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1270 "operand", &error_emitted
);
1272 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1276 case ast_mul_assign
:
1277 case ast_div_assign
:
1278 case ast_add_assign
:
1279 case ast_sub_assign
: {
1280 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1281 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1283 type
= arithmetic_result_type(op
[0], op
[1],
1284 (this->oper
== ast_mul_assign
),
1287 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1290 result
= do_assignment(instructions
, state
,
1291 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1292 this->subexpressions
[0]->get_location());
1293 error_emitted
= (op
[0]->type
->is_error());
1295 /* GLSL 1.10 does not allow array assignment. However, we don't have to
1296 * explicitly test for this because none of the binary expression
1297 * operators allow array operands either.
1303 case ast_mod_assign
: {
1304 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1305 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1307 type
= modulus_result_type(op
[0]->type
, op
[1]->type
, state
, & loc
);
1309 assert(operations
[this->oper
] == ir_binop_mod
);
1311 ir_rvalue
*temp_rhs
;
1312 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1315 result
= do_assignment(instructions
, state
,
1316 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1317 this->subexpressions
[0]->get_location());
1318 error_emitted
= type
->is_error();
1323 case ast_rs_assign
: {
1324 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1325 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1326 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1328 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1329 type
, op
[0], op
[1]);
1330 result
= do_assignment(instructions
, state
, op
[0]->clone(ctx
, NULL
),
1332 this->subexpressions
[0]->get_location());
1333 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1337 case ast_and_assign
:
1338 case ast_xor_assign
:
1339 case ast_or_assign
: {
1340 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1341 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1342 type
= bit_logic_result_type(op
[0]->type
, op
[1]->type
, this->oper
,
1344 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1345 type
, op
[0], op
[1]);
1346 result
= do_assignment(instructions
, state
, op
[0]->clone(ctx
, NULL
),
1348 this->subexpressions
[0]->get_location());
1349 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1353 case ast_conditional
: {
1354 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1356 * "The ternary selection operator (?:). It operates on three
1357 * expressions (exp1 ? exp2 : exp3). This operator evaluates the
1358 * first expression, which must result in a scalar Boolean."
1360 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1361 "condition", &error_emitted
);
1363 /* The :? operator is implemented by generating an anonymous temporary
1364 * followed by an if-statement. The last instruction in each branch of
1365 * the if-statement assigns a value to the anonymous temporary. This
1366 * temporary is the r-value of the expression.
1368 exec_list then_instructions
;
1369 exec_list else_instructions
;
1371 op
[1] = this->subexpressions
[1]->hir(&then_instructions
, state
);
1372 op
[2] = this->subexpressions
[2]->hir(&else_instructions
, state
);
1374 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1376 * "The second and third expressions can be any type, as
1377 * long their types match, or there is a conversion in
1378 * Section 4.1.10 "Implicit Conversions" that can be applied
1379 * to one of the expressions to make their types match. This
1380 * resulting matching type is the type of the entire
1383 if ((!apply_implicit_conversion(op
[1]->type
, op
[2], state
)
1384 && !apply_implicit_conversion(op
[2]->type
, op
[1], state
))
1385 || (op
[1]->type
!= op
[2]->type
)) {
1386 YYLTYPE loc
= this->subexpressions
[1]->get_location();
1388 _mesa_glsl_error(& loc
, state
, "Second and third operands of ?: "
1389 "operator must have matching types.");
1390 error_emitted
= true;
1391 type
= glsl_type::error_type
;
1396 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1398 * "The second and third expressions must be the same type, but can
1399 * be of any type other than an array."
1401 if ((state
->language_version
<= 110) && type
->is_array()) {
1402 _mesa_glsl_error(& loc
, state
, "Second and third operands of ?: "
1403 "operator must not be arrays.");
1404 error_emitted
= true;
1407 ir_constant
*cond_val
= op
[0]->constant_expression_value();
1408 ir_constant
*then_val
= op
[1]->constant_expression_value();
1409 ir_constant
*else_val
= op
[2]->constant_expression_value();
1411 if (then_instructions
.is_empty()
1412 && else_instructions
.is_empty()
1413 && (cond_val
!= NULL
) && (then_val
!= NULL
) && (else_val
!= NULL
)) {
1414 result
= (cond_val
->value
.b
[0]) ? then_val
: else_val
;
1416 ir_variable
*const tmp
=
1417 new(ctx
) ir_variable(type
, "conditional_tmp", ir_var_temporary
);
1418 instructions
->push_tail(tmp
);
1420 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1421 instructions
->push_tail(stmt
);
1423 then_instructions
.move_nodes_to(& stmt
->then_instructions
);
1424 ir_dereference
*const then_deref
=
1425 new(ctx
) ir_dereference_variable(tmp
);
1426 ir_assignment
*const then_assign
=
1427 new(ctx
) ir_assignment(then_deref
, op
[1], NULL
);
1428 stmt
->then_instructions
.push_tail(then_assign
);
1430 else_instructions
.move_nodes_to(& stmt
->else_instructions
);
1431 ir_dereference
*const else_deref
=
1432 new(ctx
) ir_dereference_variable(tmp
);
1433 ir_assignment
*const else_assign
=
1434 new(ctx
) ir_assignment(else_deref
, op
[2], NULL
);
1435 stmt
->else_instructions
.push_tail(else_assign
);
1437 result
= new(ctx
) ir_dereference_variable(tmp
);
1444 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1445 if (op
[0]->type
->base_type
== GLSL_TYPE_FLOAT
)
1446 op
[1] = new(ctx
) ir_constant(1.0f
);
1448 op
[1] = new(ctx
) ir_constant(1);
1450 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1452 ir_rvalue
*temp_rhs
;
1453 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1456 result
= do_assignment(instructions
, state
,
1457 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1458 this->subexpressions
[0]->get_location());
1459 error_emitted
= op
[0]->type
->is_error();
1464 case ast_post_dec
: {
1465 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1466 if (op
[0]->type
->base_type
== GLSL_TYPE_FLOAT
)
1467 op
[1] = new(ctx
) ir_constant(1.0f
);
1469 op
[1] = new(ctx
) ir_constant(1);
1471 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1473 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1475 ir_rvalue
*temp_rhs
;
1476 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1479 /* Get a temporary of a copy of the lvalue before it's modified.
1480 * This may get thrown away later.
1482 result
= get_lvalue_copy(instructions
, op
[0]->clone(ctx
, NULL
));
1484 (void)do_assignment(instructions
, state
,
1485 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1486 this->subexpressions
[0]->get_location());
1488 error_emitted
= op
[0]->type
->is_error();
1492 case ast_field_selection
:
1493 result
= _mesa_ast_field_selection_to_hir(this, instructions
, state
);
1496 case ast_array_index
: {
1497 YYLTYPE index_loc
= subexpressions
[1]->get_location();
1499 op
[0] = subexpressions
[0]->hir(instructions
, state
);
1500 op
[1] = subexpressions
[1]->hir(instructions
, state
);
1502 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1504 ir_rvalue
*const array
= op
[0];
1506 result
= new(ctx
) ir_dereference_array(op
[0], op
[1]);
1508 /* Do not use op[0] after this point. Use array.
1516 if (!array
->type
->is_array()
1517 && !array
->type
->is_matrix()
1518 && !array
->type
->is_vector()) {
1519 _mesa_glsl_error(& index_loc
, state
,
1520 "cannot dereference non-array / non-matrix / "
1522 error_emitted
= true;
1525 if (!op
[1]->type
->is_integer()) {
1526 _mesa_glsl_error(& index_loc
, state
,
1527 "array index must be integer type");
1528 error_emitted
= true;
1529 } else if (!op
[1]->type
->is_scalar()) {
1530 _mesa_glsl_error(& index_loc
, state
,
1531 "array index must be scalar");
1532 error_emitted
= true;
1535 /* If the array index is a constant expression and the array has a
1536 * declared size, ensure that the access is in-bounds. If the array
1537 * index is not a constant expression, ensure that the array has a
1540 ir_constant
*const const_index
= op
[1]->constant_expression_value();
1541 if (const_index
!= NULL
) {
1542 const int idx
= const_index
->value
.i
[0];
1543 const char *type_name
;
1546 if (array
->type
->is_matrix()) {
1547 type_name
= "matrix";
1548 } else if (array
->type
->is_vector()) {
1549 type_name
= "vector";
1551 type_name
= "array";
1554 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec:
1556 * "It is illegal to declare an array with a size, and then
1557 * later (in the same shader) index the same array with an
1558 * integral constant expression greater than or equal to the
1559 * declared size. It is also illegal to index an array with a
1560 * negative constant expression."
1562 if (array
->type
->is_matrix()) {
1563 if (array
->type
->row_type()->vector_elements
<= idx
) {
1564 bound
= array
->type
->row_type()->vector_elements
;
1566 } else if (array
->type
->is_vector()) {
1567 if (array
->type
->vector_elements
<= idx
) {
1568 bound
= array
->type
->vector_elements
;
1571 if ((array
->type
->array_size() > 0)
1572 && (array
->type
->array_size() <= idx
)) {
1573 bound
= array
->type
->array_size();
1578 _mesa_glsl_error(& loc
, state
, "%s index must be < %u",
1580 error_emitted
= true;
1581 } else if (idx
< 0) {
1582 _mesa_glsl_error(& loc
, state
, "%s index must be >= 0",
1584 error_emitted
= true;
1587 if (array
->type
->is_array()) {
1588 /* If the array is a variable dereference, it dereferences the
1589 * whole array, by definition. Use this to get the variable.
1591 * FINISHME: Should some methods for getting / setting / testing
1592 * FINISHME: array access limits be added to ir_dereference?
1594 ir_variable
*const v
= array
->whole_variable_referenced();
1595 if ((v
!= NULL
) && (unsigned(idx
) > v
->max_array_access
)) {
1596 v
->max_array_access
= idx
;
1598 /* Check whether this access will, as a side effect, implicitly
1599 * cause the size of a built-in array to be too large.
1601 if (check_builtin_array_max_size(v
->name
, idx
+1, loc
, state
))
1602 error_emitted
= true;
1605 } else if (array
->type
->array_size() == 0) {
1606 _mesa_glsl_error(&loc
, state
, "unsized array index must be constant");
1608 if (array
->type
->is_array()) {
1609 /* whole_variable_referenced can return NULL if the array is a
1610 * member of a structure. In this case it is safe to not update
1611 * the max_array_access field because it is never used for fields
1614 ir_variable
*v
= array
->whole_variable_referenced();
1616 v
->max_array_access
= array
->type
->array_size() - 1;
1620 /* From page 23 (29 of the PDF) of the GLSL 1.30 spec:
1622 * "Samplers aggregated into arrays within a shader (using square
1623 * brackets [ ]) can only be indexed with integral constant
1624 * expressions [...]."
1626 * This restriction was added in GLSL 1.30. Shaders using earlier version
1627 * of the language should not be rejected by the compiler front-end for
1628 * using this construct. This allows useful things such as using a loop
1629 * counter as the index to an array of samplers. If the loop in unrolled,
1630 * the code should compile correctly. Instead, emit a warning.
1632 if (array
->type
->is_array() &&
1633 array
->type
->element_type()->is_sampler() &&
1634 const_index
== NULL
) {
1636 if (state
->language_version
== 100) {
1637 _mesa_glsl_warning(&loc
, state
,
1638 "sampler arrays indexed with non-constant "
1639 "expressions is optional in GLSL ES 1.00");
1640 } else if (state
->language_version
< 130) {
1641 _mesa_glsl_warning(&loc
, state
,
1642 "sampler arrays indexed with non-constant "
1643 "expressions is forbidden in GLSL 1.30 and "
1646 _mesa_glsl_error(&loc
, state
,
1647 "sampler arrays indexed with non-constant "
1648 "expressions is forbidden in GLSL 1.30 and "
1650 error_emitted
= true;
1655 result
->type
= glsl_type::error_type
;
1660 case ast_function_call
:
1661 /* Should *NEVER* get here. ast_function_call should always be handled
1662 * by ast_function_expression::hir.
1667 case ast_identifier
: {
1668 /* ast_identifier can appear several places in a full abstract syntax
1669 * tree. This particular use must be at location specified in the grammar
1670 * as 'variable_identifier'.
1673 state
->symbols
->get_variable(this->primary_expression
.identifier
);
1675 result
= new(ctx
) ir_dereference_variable(var
);
1680 _mesa_glsl_error(& loc
, state
, "`%s' undeclared",
1681 this->primary_expression
.identifier
);
1683 error_emitted
= true;
1688 case ast_int_constant
:
1689 result
= new(ctx
) ir_constant(this->primary_expression
.int_constant
);
1692 case ast_uint_constant
:
1693 result
= new(ctx
) ir_constant(this->primary_expression
.uint_constant
);
1696 case ast_float_constant
:
1697 result
= new(ctx
) ir_constant(this->primary_expression
.float_constant
);
1700 case ast_bool_constant
:
1701 result
= new(ctx
) ir_constant(bool(this->primary_expression
.bool_constant
));
1704 case ast_sequence
: {
1705 /* It should not be possible to generate a sequence in the AST without
1706 * any expressions in it.
1708 assert(!this->expressions
.is_empty());
1710 /* The r-value of a sequence is the last expression in the sequence. If
1711 * the other expressions in the sequence do not have side-effects (and
1712 * therefore add instructions to the instruction list), they get dropped
1715 exec_node
*previous_tail_pred
= NULL
;
1716 YYLTYPE previous_operand_loc
= loc
;
1718 foreach_list_typed (ast_node
, ast
, link
, &this->expressions
) {
1719 /* If one of the operands of comma operator does not generate any
1720 * code, we want to emit a warning. At each pass through the loop
1721 * previous_tail_pred will point to the last instruction in the
1722 * stream *before* processing the previous operand. Naturally,
1723 * instructions->tail_pred will point to the last instruction in the
1724 * stream *after* processing the previous operand. If the two
1725 * pointers match, then the previous operand had no effect.
1727 * The warning behavior here differs slightly from GCC. GCC will
1728 * only emit a warning if none of the left-hand operands have an
1729 * effect. However, it will emit a warning for each. I believe that
1730 * there are some cases in C (especially with GCC extensions) where
1731 * it is useful to have an intermediate step in a sequence have no
1732 * effect, but I don't think these cases exist in GLSL. Either way,
1733 * it would be a giant hassle to replicate that behavior.
1735 if (previous_tail_pred
== instructions
->tail_pred
) {
1736 _mesa_glsl_warning(&previous_operand_loc
, state
,
1737 "left-hand operand of comma expression has "
1741 /* tail_pred is directly accessed instead of using the get_tail()
1742 * method for performance reasons. get_tail() has extra code to
1743 * return NULL when the list is empty. We don't care about that
1744 * here, so using tail_pred directly is fine.
1746 previous_tail_pred
= instructions
->tail_pred
;
1747 previous_operand_loc
= ast
->get_location();
1749 result
= ast
->hir(instructions
, state
);
1752 /* Any errors should have already been emitted in the loop above.
1754 error_emitted
= true;
1758 type
= NULL
; /* use result->type, not type. */
1759 assert(result
!= NULL
);
1761 if (result
->type
->is_error() && !error_emitted
)
1762 _mesa_glsl_error(& loc
, state
, "type mismatch");
1769 ast_expression_statement::hir(exec_list
*instructions
,
1770 struct _mesa_glsl_parse_state
*state
)
1772 /* It is possible to have expression statements that don't have an
1773 * expression. This is the solitary semicolon:
1775 * for (i = 0; i < 5; i++)
1778 * In this case the expression will be NULL. Test for NULL and don't do
1779 * anything in that case.
1781 if (expression
!= NULL
)
1782 expression
->hir(instructions
, state
);
1784 /* Statements do not have r-values.
1791 ast_compound_statement::hir(exec_list
*instructions
,
1792 struct _mesa_glsl_parse_state
*state
)
1795 state
->symbols
->push_scope();
1797 foreach_list_typed (ast_node
, ast
, link
, &this->statements
)
1798 ast
->hir(instructions
, state
);
1801 state
->symbols
->pop_scope();
1803 /* Compound statements do not have r-values.
1809 static const glsl_type
*
1810 process_array_type(YYLTYPE
*loc
, const glsl_type
*base
, ast_node
*array_size
,
1811 struct _mesa_glsl_parse_state
*state
)
1813 unsigned length
= 0;
1815 /* FINISHME: Reject delcarations of multidimensional arrays. */
1817 if (array_size
!= NULL
) {
1818 exec_list dummy_instructions
;
1819 ir_rvalue
*const ir
= array_size
->hir(& dummy_instructions
, state
);
1820 YYLTYPE loc
= array_size
->get_location();
1823 if (!ir
->type
->is_integer()) {
1824 _mesa_glsl_error(& loc
, state
, "array size must be integer type");
1825 } else if (!ir
->type
->is_scalar()) {
1826 _mesa_glsl_error(& loc
, state
, "array size must be scalar type");
1828 ir_constant
*const size
= ir
->constant_expression_value();
1831 _mesa_glsl_error(& loc
, state
, "array size must be a "
1832 "constant valued expression");
1833 } else if (size
->value
.i
[0] <= 0) {
1834 _mesa_glsl_error(& loc
, state
, "array size must be > 0");
1836 assert(size
->type
== ir
->type
);
1837 length
= size
->value
.u
[0];
1839 /* If the array size is const (and we've verified that
1840 * it is) then no instructions should have been emitted
1841 * when we converted it to HIR. If they were emitted,
1842 * then either the array size isn't const after all, or
1843 * we are emitting unnecessary instructions.
1845 assert(dummy_instructions
.is_empty());
1849 } else if (state
->es_shader
) {
1850 /* Section 10.17 of the GLSL ES 1.00 specification states that unsized
1851 * array declarations have been removed from the language.
1853 _mesa_glsl_error(loc
, state
, "unsized array declarations are not "
1854 "allowed in GLSL ES 1.00.");
1857 return glsl_type::get_array_instance(base
, length
);
1862 ast_type_specifier::glsl_type(const char **name
,
1863 struct _mesa_glsl_parse_state
*state
) const
1865 const struct glsl_type
*type
;
1867 type
= state
->symbols
->get_type(this->type_name
);
1868 *name
= this->type_name
;
1870 if (this->is_array
) {
1871 YYLTYPE loc
= this->get_location();
1872 type
= process_array_type(&loc
, type
, this->array_size
, state
);
1880 apply_type_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
1882 struct _mesa_glsl_parse_state
*state
,
1885 if (qual
->flags
.q
.invariant
) {
1887 _mesa_glsl_error(loc
, state
,
1888 "variable `%s' may not be redeclared "
1889 "`invariant' after being used",
1896 if (qual
->flags
.q
.constant
|| qual
->flags
.q
.attribute
1897 || qual
->flags
.q
.uniform
1898 || (qual
->flags
.q
.varying
&& (state
->target
== fragment_shader
)))
1901 if (qual
->flags
.q
.centroid
)
1904 if (qual
->flags
.q
.attribute
&& state
->target
!= vertex_shader
) {
1905 var
->type
= glsl_type::error_type
;
1906 _mesa_glsl_error(loc
, state
,
1907 "`attribute' variables may not be declared in the "
1909 _mesa_glsl_shader_target_name(state
->target
));
1912 /* From page 25 (page 31 of the PDF) of the GLSL 1.10 spec:
1914 * "The varying qualifier can be used only with the data types
1915 * float, vec2, vec3, vec4, mat2, mat3, and mat4, or arrays of
1918 if (qual
->flags
.q
.varying
) {
1919 const glsl_type
*non_array_type
;
1921 if (var
->type
&& var
->type
->is_array())
1922 non_array_type
= var
->type
->fields
.array
;
1924 non_array_type
= var
->type
;
1926 if (non_array_type
&& non_array_type
->base_type
!= GLSL_TYPE_FLOAT
) {
1927 var
->type
= glsl_type::error_type
;
1928 _mesa_glsl_error(loc
, state
,
1929 "varying variables must be of base type float");
1933 /* If there is no qualifier that changes the mode of the variable, leave
1934 * the setting alone.
1936 if (qual
->flags
.q
.in
&& qual
->flags
.q
.out
)
1937 var
->mode
= ir_var_inout
;
1938 else if (qual
->flags
.q
.attribute
|| qual
->flags
.q
.in
1939 || (qual
->flags
.q
.varying
&& (state
->target
== fragment_shader
)))
1940 var
->mode
= ir_var_in
;
1941 else if (qual
->flags
.q
.out
1942 || (qual
->flags
.q
.varying
&& (state
->target
== vertex_shader
)))
1943 var
->mode
= ir_var_out
;
1944 else if (qual
->flags
.q
.uniform
)
1945 var
->mode
= ir_var_uniform
;
1947 if (state
->all_invariant
&& (state
->current_function
== NULL
)) {
1948 switch (state
->target
) {
1950 if (var
->mode
== ir_var_out
)
1951 var
->invariant
= true;
1953 case geometry_shader
:
1954 if ((var
->mode
== ir_var_in
) || (var
->mode
== ir_var_out
))
1955 var
->invariant
= true;
1957 case fragment_shader
:
1958 if (var
->mode
== ir_var_in
)
1959 var
->invariant
= true;
1964 if (qual
->flags
.q
.flat
)
1965 var
->interpolation
= INTERP_QUALIFIER_FLAT
;
1966 else if (qual
->flags
.q
.noperspective
)
1967 var
->interpolation
= INTERP_QUALIFIER_NOPERSPECTIVE
;
1969 var
->interpolation
= INTERP_QUALIFIER_SMOOTH
;
1971 var
->pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
1972 var
->origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
1973 if ((qual
->flags
.q
.origin_upper_left
|| qual
->flags
.q
.pixel_center_integer
)
1974 && (strcmp(var
->name
, "gl_FragCoord") != 0)) {
1975 const char *const qual_string
= (qual
->flags
.q
.origin_upper_left
)
1976 ? "origin_upper_left" : "pixel_center_integer";
1978 _mesa_glsl_error(loc
, state
,
1979 "layout qualifier `%s' can only be applied to "
1980 "fragment shader input `gl_FragCoord'",
1984 if (qual
->flags
.q
.explicit_location
) {
1985 const bool global_scope
= (state
->current_function
== NULL
);
1987 const char *string
= "";
1989 /* In the vertex shader only shader inputs can be given explicit
1992 * In the fragment shader only shader outputs can be given explicit
1995 switch (state
->target
) {
1997 if (!global_scope
|| (var
->mode
!= ir_var_in
)) {
2003 case geometry_shader
:
2004 _mesa_glsl_error(loc
, state
,
2005 "geometry shader variables cannot be given "
2006 "explicit locations\n");
2009 case fragment_shader
:
2010 if (!global_scope
|| (var
->mode
!= ir_var_out
)) {
2018 _mesa_glsl_error(loc
, state
,
2019 "only %s shader %s variables can be given an "
2020 "explicit location\n",
2021 _mesa_glsl_shader_target_name(state
->target
),
2024 var
->explicit_location
= true;
2026 /* This bit of silliness is needed because invalid explicit locations
2027 * are supposed to be flagged during linking. Small negative values
2028 * biased by VERT_ATTRIB_GENERIC0 or FRAG_RESULT_DATA0 could alias
2029 * built-in values (e.g., -16+VERT_ATTRIB_GENERIC0 = VERT_ATTRIB_POS).
2030 * The linker needs to be able to differentiate these cases. This
2031 * ensures that negative values stay negative.
2033 if (qual
->location
>= 0) {
2034 var
->location
= (state
->target
== vertex_shader
)
2035 ? (qual
->location
+ VERT_ATTRIB_GENERIC0
)
2036 : (qual
->location
+ FRAG_RESULT_DATA0
);
2038 var
->location
= qual
->location
;
2043 /* Does the declaration use the 'layout' keyword?
2045 const bool uses_layout
= qual
->flags
.q
.pixel_center_integer
2046 || qual
->flags
.q
.origin_upper_left
2047 || qual
->flags
.q
.explicit_location
;
2049 /* Does the declaration use the deprecated 'attribute' or 'varying'
2052 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
2053 || qual
->flags
.q
.varying
;
2055 /* Is the 'layout' keyword used with parameters that allow relaxed checking.
2056 * Many implementations of GL_ARB_fragment_coord_conventions_enable and some
2057 * implementations (only Mesa?) GL_ARB_explicit_attrib_location_enable
2058 * allowed the layout qualifier to be used with 'varying' and 'attribute'.
2059 * These extensions and all following extensions that add the 'layout'
2060 * keyword have been modified to require the use of 'in' or 'out'.
2062 * The following extension do not allow the deprecated keywords:
2064 * GL_AMD_conservative_depth
2065 * GL_ARB_gpu_shader5
2066 * GL_ARB_separate_shader_objects
2067 * GL_ARB_tesselation_shader
2068 * GL_ARB_transform_feedback3
2069 * GL_ARB_uniform_buffer_object
2071 * It is unknown whether GL_EXT_shader_image_load_store or GL_NV_gpu_shader5
2072 * allow layout with the deprecated keywords.
2074 const bool relaxed_layout_qualifier_checking
=
2075 state
->ARB_fragment_coord_conventions_enable
;
2077 if (uses_layout
&& uses_deprecated_qualifier
) {
2078 if (relaxed_layout_qualifier_checking
) {
2079 _mesa_glsl_warning(loc
, state
,
2080 "`layout' qualifier may not be used with "
2081 "`attribute' or `varying'");
2083 _mesa_glsl_error(loc
, state
,
2084 "`layout' qualifier may not be used with "
2085 "`attribute' or `varying'");
2089 /* Layout qualifiers for gl_FragDepth, which are enabled by extension
2090 * AMD_conservative_depth.
2092 int depth_layout_count
= qual
->flags
.q
.depth_any
2093 + qual
->flags
.q
.depth_greater
2094 + qual
->flags
.q
.depth_less
2095 + qual
->flags
.q
.depth_unchanged
;
2096 if (depth_layout_count
> 0
2097 && !state
->AMD_conservative_depth_enable
) {
2098 _mesa_glsl_error(loc
, state
,
2099 "extension GL_AMD_conservative_depth must be enabled "
2100 "to use depth layout qualifiers");
2101 } else if (depth_layout_count
> 0
2102 && strcmp(var
->name
, "gl_FragDepth") != 0) {
2103 _mesa_glsl_error(loc
, state
,
2104 "depth layout qualifiers can be applied only to "
2106 } else if (depth_layout_count
> 1
2107 && strcmp(var
->name
, "gl_FragDepth") == 0) {
2108 _mesa_glsl_error(loc
, state
,
2109 "at most one depth layout qualifier can be applied to "
2112 if (qual
->flags
.q
.depth_any
)
2113 var
->depth_layout
= ir_depth_layout_any
;
2114 else if (qual
->flags
.q
.depth_greater
)
2115 var
->depth_layout
= ir_depth_layout_greater
;
2116 else if (qual
->flags
.q
.depth_less
)
2117 var
->depth_layout
= ir_depth_layout_less
;
2118 else if (qual
->flags
.q
.depth_unchanged
)
2119 var
->depth_layout
= ir_depth_layout_unchanged
;
2121 var
->depth_layout
= ir_depth_layout_none
;
2125 * Get the variable that is being redeclared by this declaration
2127 * Semantic checks to verify the validity of the redeclaration are also
2128 * performed. If semantic checks fail, compilation error will be emitted via
2129 * \c _mesa_glsl_error, but a non-\c NULL pointer will still be returned.
2132 * A pointer to an existing variable in the current scope if the declaration
2133 * is a redeclaration, \c NULL otherwise.
2136 get_variable_being_redeclared(ir_variable
*var
, ast_declaration
*decl
,
2137 struct _mesa_glsl_parse_state
*state
)
2139 /* Check if this declaration is actually a re-declaration, either to
2140 * resize an array or add qualifiers to an existing variable.
2142 * This is allowed for variables in the current scope, or when at
2143 * global scope (for built-ins in the implicit outer scope).
2145 ir_variable
*earlier
= state
->symbols
->get_variable(decl
->identifier
);
2146 if (earlier
== NULL
||
2147 (state
->current_function
!= NULL
&&
2148 !state
->symbols
->name_declared_this_scope(decl
->identifier
))) {
2153 YYLTYPE loc
= decl
->get_location();
2155 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec,
2157 * "It is legal to declare an array without a size and then
2158 * later re-declare the same name as an array of the same
2159 * type and specify a size."
2161 if ((earlier
->type
->array_size() == 0)
2162 && var
->type
->is_array()
2163 && (var
->type
->element_type() == earlier
->type
->element_type())) {
2164 /* FINISHME: This doesn't match the qualifiers on the two
2165 * FINISHME: declarations. It's not 100% clear whether this is
2166 * FINISHME: required or not.
2169 const unsigned size
= unsigned(var
->type
->array_size());
2170 check_builtin_array_max_size(var
->name
, size
, loc
, state
);
2171 if ((size
> 0) && (size
<= earlier
->max_array_access
)) {
2172 _mesa_glsl_error(& loc
, state
, "array size must be > %u due to "
2174 earlier
->max_array_access
);
2177 earlier
->type
= var
->type
;
2180 } else if (state
->ARB_fragment_coord_conventions_enable
2181 && strcmp(var
->name
, "gl_FragCoord") == 0
2182 && earlier
->type
== var
->type
2183 && earlier
->mode
== var
->mode
) {
2184 /* Allow redeclaration of gl_FragCoord for ARB_fcc layout
2187 earlier
->origin_upper_left
= var
->origin_upper_left
;
2188 earlier
->pixel_center_integer
= var
->pixel_center_integer
;
2190 /* According to section 4.3.7 of the GLSL 1.30 spec,
2191 * the following built-in varaibles can be redeclared with an
2192 * interpolation qualifier:
2195 * * gl_FrontSecondaryColor
2196 * * gl_BackSecondaryColor
2198 * * gl_SecondaryColor
2200 } else if (state
->language_version
>= 130
2201 && (strcmp(var
->name
, "gl_FrontColor") == 0
2202 || strcmp(var
->name
, "gl_BackColor") == 0
2203 || strcmp(var
->name
, "gl_FrontSecondaryColor") == 0
2204 || strcmp(var
->name
, "gl_BackSecondaryColor") == 0
2205 || strcmp(var
->name
, "gl_Color") == 0
2206 || strcmp(var
->name
, "gl_SecondaryColor") == 0)
2207 && earlier
->type
== var
->type
2208 && earlier
->mode
== var
->mode
) {
2209 earlier
->interpolation
= var
->interpolation
;
2211 /* Layout qualifiers for gl_FragDepth. */
2212 } else if (state
->AMD_conservative_depth_enable
2213 && strcmp(var
->name
, "gl_FragDepth") == 0
2214 && earlier
->type
== var
->type
2215 && earlier
->mode
== var
->mode
) {
2217 /** From the AMD_conservative_depth spec:
2218 * Within any shader, the first redeclarations of gl_FragDepth
2219 * must appear before any use of gl_FragDepth.
2221 if (earlier
->used
) {
2222 _mesa_glsl_error(&loc
, state
,
2223 "the first redeclaration of gl_FragDepth "
2224 "must appear before any use of gl_FragDepth");
2227 /* Prevent inconsistent redeclaration of depth layout qualifier. */
2228 if (earlier
->depth_layout
!= ir_depth_layout_none
2229 && earlier
->depth_layout
!= var
->depth_layout
) {
2230 _mesa_glsl_error(&loc
, state
,
2231 "gl_FragDepth: depth layout is declared here "
2232 "as '%s, but it was previously declared as "
2234 depth_layout_string(var
->depth_layout
),
2235 depth_layout_string(earlier
->depth_layout
));
2238 earlier
->depth_layout
= var
->depth_layout
;
2241 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", decl
->identifier
);
2248 * Generate the IR for an initializer in a variable declaration
2251 process_initializer(ir_variable
*var
, ast_declaration
*decl
,
2252 ast_fully_specified_type
*type
,
2253 exec_list
*initializer_instructions
,
2254 struct _mesa_glsl_parse_state
*state
)
2256 ir_rvalue
*result
= NULL
;
2258 YYLTYPE initializer_loc
= decl
->initializer
->get_location();
2260 /* From page 24 (page 30 of the PDF) of the GLSL 1.10 spec:
2262 * "All uniform variables are read-only and are initialized either
2263 * directly by an application via API commands, or indirectly by
2266 if ((state
->language_version
<= 110)
2267 && (var
->mode
== ir_var_uniform
)) {
2268 _mesa_glsl_error(& initializer_loc
, state
,
2269 "cannot initialize uniforms in GLSL 1.10");
2272 if (var
->type
->is_sampler()) {
2273 _mesa_glsl_error(& initializer_loc
, state
,
2274 "cannot initialize samplers");
2277 if ((var
->mode
== ir_var_in
) && (state
->current_function
== NULL
)) {
2278 _mesa_glsl_error(& initializer_loc
, state
,
2279 "cannot initialize %s shader input / %s",
2280 _mesa_glsl_shader_target_name(state
->target
),
2281 (state
->target
== vertex_shader
)
2282 ? "attribute" : "varying");
2285 ir_dereference
*const lhs
= new(state
) ir_dereference_variable(var
);
2286 ir_rvalue
*rhs
= decl
->initializer
->hir(initializer_instructions
,
2289 /* Calculate the constant value if this is a const or uniform
2292 if (type
->qualifier
.flags
.q
.constant
2293 || type
->qualifier
.flags
.q
.uniform
) {
2294 ir_rvalue
*new_rhs
= validate_assignment(state
, var
->type
, rhs
, true);
2295 if (new_rhs
!= NULL
) {
2298 ir_constant
*constant_value
= rhs
->constant_expression_value();
2299 if (!constant_value
) {
2300 _mesa_glsl_error(& initializer_loc
, state
,
2301 "initializer of %s variable `%s' must be a "
2302 "constant expression",
2303 (type
->qualifier
.flags
.q
.constant
)
2304 ? "const" : "uniform",
2306 if (var
->type
->is_numeric()) {
2307 /* Reduce cascading errors. */
2308 var
->constant_value
= ir_constant::zero(state
, var
->type
);
2311 rhs
= constant_value
;
2312 var
->constant_value
= constant_value
;
2315 _mesa_glsl_error(&initializer_loc
, state
,
2316 "initializer of type %s cannot be assigned to "
2317 "variable of type %s",
2318 rhs
->type
->name
, var
->type
->name
);
2319 if (var
->type
->is_numeric()) {
2320 /* Reduce cascading errors. */
2321 var
->constant_value
= ir_constant::zero(state
, var
->type
);
2326 if (rhs
&& !rhs
->type
->is_error()) {
2327 bool temp
= var
->read_only
;
2328 if (type
->qualifier
.flags
.q
.constant
)
2329 var
->read_only
= false;
2331 /* Never emit code to initialize a uniform.
2333 const glsl_type
*initializer_type
;
2334 if (!type
->qualifier
.flags
.q
.uniform
) {
2335 result
= do_assignment(initializer_instructions
, state
,
2337 type
->get_location());
2338 initializer_type
= result
->type
;
2340 initializer_type
= rhs
->type
;
2342 /* If the declared variable is an unsized array, it must inherrit
2343 * its full type from the initializer. A declaration such as
2345 * uniform float a[] = float[](1.0, 2.0, 3.0, 3.0);
2349 * uniform float a[4] = float[](1.0, 2.0, 3.0, 3.0);
2351 * The assignment generated in the if-statement (below) will also
2352 * automatically handle this case for non-uniforms.
2354 * If the declared variable is not an array, the types must
2355 * already match exactly. As a result, the type assignment
2356 * here can be done unconditionally. For non-uniforms the call
2357 * to do_assignment can change the type of the initializer (via
2358 * the implicit conversion rules). For uniforms the initializer
2359 * must be a constant expression, and the type of that expression
2360 * was validated above.
2362 var
->type
= initializer_type
;
2364 var
->read_only
= temp
;
2371 ast_declarator_list::hir(exec_list
*instructions
,
2372 struct _mesa_glsl_parse_state
*state
)
2375 const struct glsl_type
*decl_type
;
2376 const char *type_name
= NULL
;
2377 ir_rvalue
*result
= NULL
;
2378 YYLTYPE loc
= this->get_location();
2380 /* From page 46 (page 52 of the PDF) of the GLSL 1.50 spec:
2382 * "To ensure that a particular output variable is invariant, it is
2383 * necessary to use the invariant qualifier. It can either be used to
2384 * qualify a previously declared variable as being invariant
2386 * invariant gl_Position; // make existing gl_Position be invariant"
2388 * In these cases the parser will set the 'invariant' flag in the declarator
2389 * list, and the type will be NULL.
2391 if (this->invariant
) {
2392 assert(this->type
== NULL
);
2394 if (state
->current_function
!= NULL
) {
2395 _mesa_glsl_error(& loc
, state
,
2396 "All uses of `invariant' keyword must be at global "
2400 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
2401 assert(!decl
->is_array
);
2402 assert(decl
->array_size
== NULL
);
2403 assert(decl
->initializer
== NULL
);
2405 ir_variable
*const earlier
=
2406 state
->symbols
->get_variable(decl
->identifier
);
2407 if (earlier
== NULL
) {
2408 _mesa_glsl_error(& loc
, state
,
2409 "Undeclared variable `%s' cannot be marked "
2410 "invariant\n", decl
->identifier
);
2411 } else if ((state
->target
== vertex_shader
)
2412 && (earlier
->mode
!= ir_var_out
)) {
2413 _mesa_glsl_error(& loc
, state
,
2414 "`%s' cannot be marked invariant, vertex shader "
2415 "outputs only\n", decl
->identifier
);
2416 } else if ((state
->target
== fragment_shader
)
2417 && (earlier
->mode
!= ir_var_in
)) {
2418 _mesa_glsl_error(& loc
, state
,
2419 "`%s' cannot be marked invariant, fragment shader "
2420 "inputs only\n", decl
->identifier
);
2421 } else if (earlier
->used
) {
2422 _mesa_glsl_error(& loc
, state
,
2423 "variable `%s' may not be redeclared "
2424 "`invariant' after being used",
2427 earlier
->invariant
= true;
2431 /* Invariant redeclarations do not have r-values.
2436 assert(this->type
!= NULL
);
2437 assert(!this->invariant
);
2439 /* The type specifier may contain a structure definition. Process that
2440 * before any of the variable declarations.
2442 (void) this->type
->specifier
->hir(instructions
, state
);
2444 decl_type
= this->type
->specifier
->glsl_type(& type_name
, state
);
2445 if (this->declarations
.is_empty()) {
2446 if (decl_type
!= NULL
) {
2447 /* Warn if this empty declaration is not for declaring a structure.
2449 if (this->type
->specifier
->structure
== NULL
) {
2450 _mesa_glsl_warning(&loc
, state
, "empty declaration");
2453 _mesa_glsl_error(& loc
, state
, "incomplete declaration");
2457 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
2458 const struct glsl_type
*var_type
;
2461 /* FINISHME: Emit a warning if a variable declaration shadows a
2462 * FINISHME: declaration at a higher scope.
2465 if ((decl_type
== NULL
) || decl_type
->is_void()) {
2466 if (type_name
!= NULL
) {
2467 _mesa_glsl_error(& loc
, state
,
2468 "invalid type `%s' in declaration of `%s'",
2469 type_name
, decl
->identifier
);
2471 _mesa_glsl_error(& loc
, state
,
2472 "invalid type in declaration of `%s'",
2478 if (decl
->is_array
) {
2479 var_type
= process_array_type(&loc
, decl_type
, decl
->array_size
,
2482 var_type
= decl_type
;
2485 var
= new(ctx
) ir_variable(var_type
, decl
->identifier
, ir_var_auto
);
2487 /* From page 22 (page 28 of the PDF) of the GLSL 1.10 specification;
2489 * "Global variables can only use the qualifiers const,
2490 * attribute, uni form, or varying. Only one may be
2493 * Local variables can only use the qualifier const."
2495 * This is relaxed in GLSL 1.30. It is also relaxed by any extension
2496 * that adds the 'layout' keyword.
2498 if ((state
->language_version
< 130)
2499 && !state
->ARB_explicit_attrib_location_enable
2500 && !state
->ARB_fragment_coord_conventions_enable
) {
2501 if (this->type
->qualifier
.flags
.q
.out
) {
2502 _mesa_glsl_error(& loc
, state
,
2503 "`out' qualifier in declaration of `%s' "
2504 "only valid for function parameters in %s.",
2505 decl
->identifier
, state
->version_string
);
2507 if (this->type
->qualifier
.flags
.q
.in
) {
2508 _mesa_glsl_error(& loc
, state
,
2509 "`in' qualifier in declaration of `%s' "
2510 "only valid for function parameters in %s.",
2511 decl
->identifier
, state
->version_string
);
2513 /* FINISHME: Test for other invalid qualifiers. */
2516 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
,
2519 if (this->type
->qualifier
.flags
.q
.invariant
) {
2520 if ((state
->target
== vertex_shader
) && !(var
->mode
== ir_var_out
||
2521 var
->mode
== ir_var_inout
)) {
2522 /* FINISHME: Note that this doesn't work for invariant on
2523 * a function signature outval
2525 _mesa_glsl_error(& loc
, state
,
2526 "`%s' cannot be marked invariant, vertex shader "
2527 "outputs only\n", var
->name
);
2528 } else if ((state
->target
== fragment_shader
) &&
2529 !(var
->mode
== ir_var_in
|| var
->mode
== ir_var_inout
)) {
2530 /* FINISHME: Note that this doesn't work for invariant on
2531 * a function signature inval
2533 _mesa_glsl_error(& loc
, state
,
2534 "`%s' cannot be marked invariant, fragment shader "
2535 "inputs only\n", var
->name
);
2539 if (state
->current_function
!= NULL
) {
2540 const char *mode
= NULL
;
2541 const char *extra
= "";
2543 /* There is no need to check for 'inout' here because the parser will
2544 * only allow that in function parameter lists.
2546 if (this->type
->qualifier
.flags
.q
.attribute
) {
2548 } else if (this->type
->qualifier
.flags
.q
.uniform
) {
2550 } else if (this->type
->qualifier
.flags
.q
.varying
) {
2552 } else if (this->type
->qualifier
.flags
.q
.in
) {
2554 extra
= " or in function parameter list";
2555 } else if (this->type
->qualifier
.flags
.q
.out
) {
2557 extra
= " or in function parameter list";
2561 _mesa_glsl_error(& loc
, state
,
2562 "%s variable `%s' must be declared at "
2564 mode
, var
->name
, extra
);
2566 } else if (var
->mode
== ir_var_in
) {
2567 var
->read_only
= true;
2569 if (state
->target
== vertex_shader
) {
2570 bool error_emitted
= false;
2572 /* From page 31 (page 37 of the PDF) of the GLSL 1.50 spec:
2574 * "Vertex shader inputs can only be float, floating-point
2575 * vectors, matrices, signed and unsigned integers and integer
2576 * vectors. Vertex shader inputs can also form arrays of these
2577 * types, but not structures."
2579 * From page 31 (page 27 of the PDF) of the GLSL 1.30 spec:
2581 * "Vertex shader inputs can only be float, floating-point
2582 * vectors, matrices, signed and unsigned integers and integer
2583 * vectors. They cannot be arrays or structures."
2585 * From page 23 (page 29 of the PDF) of the GLSL 1.20 spec:
2587 * "The attribute qualifier can be used only with float,
2588 * floating-point vectors, and matrices. Attribute variables
2589 * cannot be declared as arrays or structures."
2591 const glsl_type
*check_type
= var
->type
->is_array()
2592 ? var
->type
->fields
.array
: var
->type
;
2594 switch (check_type
->base_type
) {
2595 case GLSL_TYPE_FLOAT
:
2597 case GLSL_TYPE_UINT
:
2599 if (state
->language_version
> 120)
2603 _mesa_glsl_error(& loc
, state
,
2604 "vertex shader input / attribute cannot have "
2606 var
->type
->is_array() ? "array of " : "",
2608 error_emitted
= true;
2611 if (!error_emitted
&& (state
->language_version
<= 130)
2612 && var
->type
->is_array()) {
2613 _mesa_glsl_error(& loc
, state
,
2614 "vertex shader input / attribute cannot have "
2616 error_emitted
= true;
2621 /* Integer vertex outputs must be qualified with 'flat'.
2623 * From section 4.3.6 of the GLSL 1.30 spec:
2624 * "If a vertex output is a signed or unsigned integer or integer
2625 * vector, then it must be qualified with the interpolation qualifier
2628 if (state
->language_version
>= 130
2629 && state
->target
== vertex_shader
2630 && state
->current_function
== NULL
2631 && var
->type
->is_integer()
2632 && var
->mode
== ir_var_out
2633 && var
->interpolation
!= INTERP_QUALIFIER_FLAT
) {
2635 _mesa_glsl_error(&loc
, state
, "If a vertex output is an integer, "
2636 "then it must be qualified with 'flat'");
2640 /* Interpolation qualifiers cannot be applied to 'centroid' and
2641 * 'centroid varying'.
2643 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
2644 * "interpolation qualifiers may only precede the qualifiers in,
2645 * centroid in, out, or centroid out in a declaration. They do not apply
2646 * to the deprecated storage qualifiers varying or centroid varying."
2648 if (state
->language_version
>= 130
2649 && this->type
->qualifier
.has_interpolation()
2650 && this->type
->qualifier
.flags
.q
.varying
) {
2652 const char *i
= this->type
->qualifier
.interpolation_string();
2655 if (this->type
->qualifier
.flags
.q
.centroid
)
2656 s
= "centroid varying";
2660 _mesa_glsl_error(&loc
, state
,
2661 "qualifier '%s' cannot be applied to the "
2662 "deprecated storage qualifier '%s'", i
, s
);
2666 /* Interpolation qualifiers can only apply to vertex shader outputs and
2667 * fragment shader inputs.
2669 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
2670 * "Outputs from a vertex shader (out) and inputs to a fragment
2671 * shader (in) can be further qualified with one or more of these
2672 * interpolation qualifiers"
2674 if (state
->language_version
>= 130
2675 && this->type
->qualifier
.has_interpolation()) {
2677 const char *i
= this->type
->qualifier
.interpolation_string();
2680 switch (state
->target
) {
2682 if (this->type
->qualifier
.flags
.q
.in
) {
2683 _mesa_glsl_error(&loc
, state
,
2684 "qualifier '%s' cannot be applied to vertex "
2685 "shader inputs", i
);
2688 case fragment_shader
:
2689 if (this->type
->qualifier
.flags
.q
.out
) {
2690 _mesa_glsl_error(&loc
, state
,
2691 "qualifier '%s' cannot be applied to fragment "
2692 "shader outputs", i
);
2701 /* From section 4.3.4 of the GLSL 1.30 spec:
2702 * "It is an error to use centroid in in a vertex shader."
2704 if (state
->language_version
>= 130
2705 && this->type
->qualifier
.flags
.q
.centroid
2706 && this->type
->qualifier
.flags
.q
.in
2707 && state
->target
== vertex_shader
) {
2709 _mesa_glsl_error(&loc
, state
,
2710 "'centroid in' cannot be used in a vertex shader");
2714 /* Precision qualifiers exists only in GLSL versions 1.00 and >= 1.30.
2716 if (this->type
->specifier
->precision
!= ast_precision_none
2717 && state
->language_version
!= 100
2718 && state
->language_version
< 130) {
2720 _mesa_glsl_error(&loc
, state
,
2721 "precision qualifiers are supported only in GLSL ES "
2722 "1.00, and GLSL 1.30 and later");
2726 /* Precision qualifiers only apply to floating point and integer types.
2728 * From section 4.5.2 of the GLSL 1.30 spec:
2729 * "Any floating point or any integer declaration can have the type
2730 * preceded by one of these precision qualifiers [...] Literal
2731 * constants do not have precision qualifiers. Neither do Boolean
2734 * In GLSL ES, sampler types are also allowed.
2736 * From page 87 of the GLSL ES spec:
2737 * "RESOLUTION: Allow sampler types to take a precision qualifier."
2739 if (this->type
->specifier
->precision
!= ast_precision_none
2740 && !var
->type
->is_float()
2741 && !var
->type
->is_integer()
2742 && !(var
->type
->is_sampler() && state
->es_shader
)
2743 && !(var
->type
->is_array()
2744 && (var
->type
->fields
.array
->is_float()
2745 || var
->type
->fields
.array
->is_integer()))) {
2747 _mesa_glsl_error(&loc
, state
,
2748 "precision qualifiers apply only to floating point"
2749 "%s types", state
->es_shader
? ", integer, and sampler"
2753 /* From page 17 (page 23 of the PDF) of the GLSL 1.20 spec:
2755 * "[Sampler types] can only be declared as function
2756 * parameters or uniform variables (see Section 4.3.5
2759 if (var_type
->contains_sampler() &&
2760 !this->type
->qualifier
.flags
.q
.uniform
) {
2761 _mesa_glsl_error(&loc
, state
, "samplers must be declared uniform");
2764 /* Process the initializer and add its instructions to a temporary
2765 * list. This list will be added to the instruction stream (below) after
2766 * the declaration is added. This is done because in some cases (such as
2767 * redeclarations) the declaration may not actually be added to the
2768 * instruction stream.
2770 exec_list initializer_instructions
;
2771 ir_variable
*earlier
= get_variable_being_redeclared(var
, decl
, state
);
2773 if (decl
->initializer
!= NULL
) {
2774 result
= process_initializer((earlier
== NULL
) ? var
: earlier
,
2776 &initializer_instructions
, state
);
2779 /* From page 23 (page 29 of the PDF) of the GLSL 1.10 spec:
2781 * "It is an error to write to a const variable outside of
2782 * its declaration, so they must be initialized when
2785 if (this->type
->qualifier
.flags
.q
.constant
&& decl
->initializer
== NULL
) {
2786 _mesa_glsl_error(& loc
, state
,
2787 "const declaration of `%s' must be initialized",
2791 /* If the declaration is not a redeclaration, there are a few additional
2792 * semantic checks that must be applied. In addition, variable that was
2793 * created for the declaration should be added to the IR stream.
2795 if (earlier
== NULL
) {
2796 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
2798 * "Identifiers starting with "gl_" are reserved for use by
2799 * OpenGL, and may not be declared in a shader as either a
2800 * variable or a function."
2802 if (strncmp(decl
->identifier
, "gl_", 3) == 0)
2803 _mesa_glsl_error(& loc
, state
,
2804 "identifier `%s' uses reserved `gl_' prefix",
2806 else if (strstr(decl
->identifier
, "__")) {
2807 /* From page 14 (page 20 of the PDF) of the GLSL 1.10
2810 * "In addition, all identifiers containing two
2811 * consecutive underscores (__) are reserved as
2812 * possible future keywords."
2814 _mesa_glsl_error(& loc
, state
,
2815 "identifier `%s' uses reserved `__' string",
2819 /* Add the variable to the symbol table. Note that the initializer's
2820 * IR was already processed earlier (though it hasn't been emitted
2821 * yet), without the variable in scope.
2823 * This differs from most C-like languages, but it follows the GLSL
2824 * specification. From page 28 (page 34 of the PDF) of the GLSL 1.50
2827 * "Within a declaration, the scope of a name starts immediately
2828 * after the initializer if present or immediately after the name
2829 * being declared if not."
2831 if (!state
->symbols
->add_variable(var
)) {
2832 YYLTYPE loc
= this->get_location();
2833 _mesa_glsl_error(&loc
, state
, "name `%s' already taken in the "
2834 "current scope", decl
->identifier
);
2838 /* Push the variable declaration to the top. It means that all the
2839 * variable declarations will appear in a funny last-to-first order,
2840 * but otherwise we run into trouble if a function is prototyped, a
2841 * global var is decled, then the function is defined with usage of
2842 * the global var. See glslparsertest's CorrectModule.frag.
2844 instructions
->push_head(var
);
2847 instructions
->append_list(&initializer_instructions
);
2851 /* Generally, variable declarations do not have r-values. However,
2852 * one is used for the declaration in
2854 * while (bool b = some_condition()) {
2858 * so we return the rvalue from the last seen declaration here.
2865 ast_parameter_declarator::hir(exec_list
*instructions
,
2866 struct _mesa_glsl_parse_state
*state
)
2869 const struct glsl_type
*type
;
2870 const char *name
= NULL
;
2871 YYLTYPE loc
= this->get_location();
2873 type
= this->type
->specifier
->glsl_type(& name
, state
);
2877 _mesa_glsl_error(& loc
, state
,
2878 "invalid type `%s' in declaration of `%s'",
2879 name
, this->identifier
);
2881 _mesa_glsl_error(& loc
, state
,
2882 "invalid type in declaration of `%s'",
2886 type
= glsl_type::error_type
;
2889 /* From page 62 (page 68 of the PDF) of the GLSL 1.50 spec:
2891 * "Functions that accept no input arguments need not use void in the
2892 * argument list because prototypes (or definitions) are required and
2893 * therefore there is no ambiguity when an empty argument list "( )" is
2894 * declared. The idiom "(void)" as a parameter list is provided for
2897 * Placing this check here prevents a void parameter being set up
2898 * for a function, which avoids tripping up checks for main taking
2899 * parameters and lookups of an unnamed symbol.
2901 if (type
->is_void()) {
2902 if (this->identifier
!= NULL
)
2903 _mesa_glsl_error(& loc
, state
,
2904 "named parameter cannot have type `void'");
2910 if (formal_parameter
&& (this->identifier
== NULL
)) {
2911 _mesa_glsl_error(& loc
, state
, "formal parameter lacks a name");
2915 /* This only handles "vec4 foo[..]". The earlier specifier->glsl_type(...)
2916 * call already handled the "vec4[..] foo" case.
2918 if (this->is_array
) {
2919 type
= process_array_type(&loc
, type
, this->array_size
, state
);
2922 if (type
->array_size() == 0) {
2923 _mesa_glsl_error(&loc
, state
, "arrays passed as parameters must have "
2924 "a declared size.");
2925 type
= glsl_type::error_type
;
2929 ir_variable
*var
= new(ctx
) ir_variable(type
, this->identifier
, ir_var_in
);
2931 /* Apply any specified qualifiers to the parameter declaration. Note that
2932 * for function parameters the default mode is 'in'.
2934 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
, & loc
);
2936 /* From page 17 (page 23 of the PDF) of the GLSL 1.20 spec:
2938 * "Samplers cannot be treated as l-values; hence cannot be used
2939 * as out or inout function parameters, nor can they be assigned
2942 if ((var
->mode
== ir_var_inout
|| var
->mode
== ir_var_out
)
2943 && type
->contains_sampler()) {
2944 _mesa_glsl_error(&loc
, state
, "out and inout parameters cannot contain samplers");
2945 type
= glsl_type::error_type
;
2948 /* From page 39 (page 45 of the PDF) of the GLSL 1.10 spec:
2950 * "When calling a function, expressions that do not evaluate to
2951 * l-values cannot be passed to parameters declared as out or inout."
2953 * From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
2955 * "Other binary or unary expressions, non-dereferenced arrays,
2956 * function names, swizzles with repeated fields, and constants
2957 * cannot be l-values."
2959 * So for GLSL 1.10, passing an array as an out or inout parameter is not
2960 * allowed. This restriction is removed in GLSL 1.20, and in GLSL ES.
2962 if ((var
->mode
== ir_var_inout
|| var
->mode
== ir_var_out
)
2963 && type
->is_array() && state
->language_version
== 110) {
2964 _mesa_glsl_error(&loc
, state
, "Arrays cannot be out or inout parameters in GLSL 1.10");
2965 type
= glsl_type::error_type
;
2968 instructions
->push_tail(var
);
2970 /* Parameter declarations do not have r-values.
2977 ast_parameter_declarator::parameters_to_hir(exec_list
*ast_parameters
,
2979 exec_list
*ir_parameters
,
2980 _mesa_glsl_parse_state
*state
)
2982 ast_parameter_declarator
*void_param
= NULL
;
2985 foreach_list_typed (ast_parameter_declarator
, param
, link
, ast_parameters
) {
2986 param
->formal_parameter
= formal
;
2987 param
->hir(ir_parameters
, state
);
2995 if ((void_param
!= NULL
) && (count
> 1)) {
2996 YYLTYPE loc
= void_param
->get_location();
2998 _mesa_glsl_error(& loc
, state
,
2999 "`void' parameter must be only parameter");
3005 emit_function(_mesa_glsl_parse_state
*state
, ir_function
*f
)
3007 /* IR invariants disallow function declarations or definitions
3008 * nested within other function definitions. But there is no
3009 * requirement about the relative order of function declarations
3010 * and definitions with respect to one another. So simply insert
3011 * the new ir_function block at the end of the toplevel instruction
3014 state
->toplevel_ir
->push_tail(f
);
3019 ast_function::hir(exec_list
*instructions
,
3020 struct _mesa_glsl_parse_state
*state
)
3023 ir_function
*f
= NULL
;
3024 ir_function_signature
*sig
= NULL
;
3025 exec_list hir_parameters
;
3027 const char *const name
= identifier
;
3029 /* New functions are always added to the top-level IR instruction stream,
3030 * so this instruction list pointer is ignored. See also emit_function
3033 (void) instructions
;
3035 /* From page 21 (page 27 of the PDF) of the GLSL 1.20 spec,
3037 * "Function declarations (prototypes) cannot occur inside of functions;
3038 * they must be at global scope, or for the built-in functions, outside
3039 * the global scope."
3041 * From page 27 (page 33 of the PDF) of the GLSL ES 1.00.16 spec,
3043 * "User defined functions may only be defined within the global scope."
3045 * Note that this language does not appear in GLSL 1.10.
3047 if ((state
->current_function
!= NULL
) && (state
->language_version
!= 110)) {
3048 YYLTYPE loc
= this->get_location();
3049 _mesa_glsl_error(&loc
, state
,
3050 "declaration of function `%s' not allowed within "
3051 "function body", name
);
3054 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
3056 * "Identifiers starting with "gl_" are reserved for use by
3057 * OpenGL, and may not be declared in a shader as either a
3058 * variable or a function."
3060 if (strncmp(name
, "gl_", 3) == 0) {
3061 YYLTYPE loc
= this->get_location();
3062 _mesa_glsl_error(&loc
, state
,
3063 "identifier `%s' uses reserved `gl_' prefix", name
);
3066 /* Convert the list of function parameters to HIR now so that they can be
3067 * used below to compare this function's signature with previously seen
3068 * signatures for functions with the same name.
3070 ast_parameter_declarator::parameters_to_hir(& this->parameters
,
3072 & hir_parameters
, state
);
3074 const char *return_type_name
;
3075 const glsl_type
*return_type
=
3076 this->return_type
->specifier
->glsl_type(& return_type_name
, state
);
3079 YYLTYPE loc
= this->get_location();
3080 _mesa_glsl_error(&loc
, state
,
3081 "function `%s' has undeclared return type `%s'",
3082 name
, return_type_name
);
3083 return_type
= glsl_type::error_type
;
3086 /* From page 56 (page 62 of the PDF) of the GLSL 1.30 spec:
3087 * "No qualifier is allowed on the return type of a function."
3089 if (this->return_type
->has_qualifiers()) {
3090 YYLTYPE loc
= this->get_location();
3091 _mesa_glsl_error(& loc
, state
,
3092 "function `%s' return type has qualifiers", name
);
3095 /* From page 17 (page 23 of the PDF) of the GLSL 1.20 spec:
3097 * "[Sampler types] can only be declared as function parameters
3098 * or uniform variables (see Section 4.3.5 "Uniform")".
3100 if (return_type
->contains_sampler()) {
3101 YYLTYPE loc
= this->get_location();
3102 _mesa_glsl_error(&loc
, state
,
3103 "function `%s' return type can't contain a sampler",
3107 /* Verify that this function's signature either doesn't match a previously
3108 * seen signature for a function with the same name, or, if a match is found,
3109 * that the previously seen signature does not have an associated definition.
3111 f
= state
->symbols
->get_function(name
);
3112 if (f
!= NULL
&& (state
->es_shader
|| f
->has_user_signature())) {
3113 sig
= f
->exact_matching_signature(&hir_parameters
);
3115 const char *badvar
= sig
->qualifiers_match(&hir_parameters
);
3116 if (badvar
!= NULL
) {
3117 YYLTYPE loc
= this->get_location();
3119 _mesa_glsl_error(&loc
, state
, "function `%s' parameter `%s' "
3120 "qualifiers don't match prototype", name
, badvar
);
3123 if (sig
->return_type
!= return_type
) {
3124 YYLTYPE loc
= this->get_location();
3126 _mesa_glsl_error(&loc
, state
, "function `%s' return type doesn't "
3127 "match prototype", name
);
3130 if (is_definition
&& sig
->is_defined
) {
3131 YYLTYPE loc
= this->get_location();
3133 _mesa_glsl_error(& loc
, state
, "function `%s' redefined", name
);
3137 f
= new(ctx
) ir_function(name
);
3138 if (!state
->symbols
->add_function(f
)) {
3139 /* This function name shadows a non-function use of the same name. */
3140 YYLTYPE loc
= this->get_location();
3142 _mesa_glsl_error(&loc
, state
, "function name `%s' conflicts with "
3143 "non-function", name
);
3147 emit_function(state
, f
);
3150 /* Verify the return type of main() */
3151 if (strcmp(name
, "main") == 0) {
3152 if (! return_type
->is_void()) {
3153 YYLTYPE loc
= this->get_location();
3155 _mesa_glsl_error(& loc
, state
, "main() must return void");
3158 if (!hir_parameters
.is_empty()) {
3159 YYLTYPE loc
= this->get_location();
3161 _mesa_glsl_error(& loc
, state
, "main() must not take any parameters");
3165 /* Finish storing the information about this new function in its signature.
3168 sig
= new(ctx
) ir_function_signature(return_type
);
3169 f
->add_signature(sig
);
3172 sig
->replace_parameters(&hir_parameters
);
3175 /* Function declarations (prototypes) do not have r-values.
3182 ast_function_definition::hir(exec_list
*instructions
,
3183 struct _mesa_glsl_parse_state
*state
)
3185 prototype
->is_definition
= true;
3186 prototype
->hir(instructions
, state
);
3188 ir_function_signature
*signature
= prototype
->signature
;
3189 if (signature
== NULL
)
3192 assert(state
->current_function
== NULL
);
3193 state
->current_function
= signature
;
3194 state
->found_return
= false;
3196 /* Duplicate parameters declared in the prototype as concrete variables.
3197 * Add these to the symbol table.
3199 state
->symbols
->push_scope();
3200 foreach_iter(exec_list_iterator
, iter
, signature
->parameters
) {
3201 ir_variable
*const var
= ((ir_instruction
*) iter
.get())->as_variable();
3203 assert(var
!= NULL
);
3205 /* The only way a parameter would "exist" is if two parameters have
3208 if (state
->symbols
->name_declared_this_scope(var
->name
)) {
3209 YYLTYPE loc
= this->get_location();
3211 _mesa_glsl_error(& loc
, state
, "parameter `%s' redeclared", var
->name
);
3213 state
->symbols
->add_variable(var
);
3217 /* Convert the body of the function to HIR. */
3218 this->body
->hir(&signature
->body
, state
);
3219 signature
->is_defined
= true;
3221 state
->symbols
->pop_scope();
3223 assert(state
->current_function
== signature
);
3224 state
->current_function
= NULL
;
3226 if (!signature
->return_type
->is_void() && !state
->found_return
) {
3227 YYLTYPE loc
= this->get_location();
3228 _mesa_glsl_error(& loc
, state
, "function `%s' has non-void return type "
3229 "%s, but no return statement",
3230 signature
->function_name(),
3231 signature
->return_type
->name
);
3234 /* Function definitions do not have r-values.
3241 ast_jump_statement::hir(exec_list
*instructions
,
3242 struct _mesa_glsl_parse_state
*state
)
3249 assert(state
->current_function
);
3251 if (opt_return_value
) {
3252 ir_rvalue
*const ret
= opt_return_value
->hir(instructions
, state
);
3254 /* The value of the return type can be NULL if the shader says
3255 * 'return foo();' and foo() is a function that returns void.
3257 * NOTE: The GLSL spec doesn't say that this is an error. The type
3258 * of the return value is void. If the return type of the function is
3259 * also void, then this should compile without error. Seriously.
3261 const glsl_type
*const ret_type
=
3262 (ret
== NULL
) ? glsl_type::void_type
: ret
->type
;
3264 /* Implicit conversions are not allowed for return values. */
3265 if (state
->current_function
->return_type
!= ret_type
) {
3266 YYLTYPE loc
= this->get_location();
3268 _mesa_glsl_error(& loc
, state
,
3269 "`return' with wrong type %s, in function `%s' "
3272 state
->current_function
->function_name(),
3273 state
->current_function
->return_type
->name
);
3276 inst
= new(ctx
) ir_return(ret
);
3278 if (state
->current_function
->return_type
->base_type
!=
3280 YYLTYPE loc
= this->get_location();
3282 _mesa_glsl_error(& loc
, state
,
3283 "`return' with no value, in function %s returning "
3285 state
->current_function
->function_name());
3287 inst
= new(ctx
) ir_return
;
3290 state
->found_return
= true;
3291 instructions
->push_tail(inst
);
3296 if (state
->target
!= fragment_shader
) {
3297 YYLTYPE loc
= this->get_location();
3299 _mesa_glsl_error(& loc
, state
,
3300 "`discard' may only appear in a fragment shader");
3302 instructions
->push_tail(new(ctx
) ir_discard
);
3307 /* FINISHME: Handle switch-statements. They cannot contain 'continue',
3308 * FINISHME: and they use a different IR instruction for 'break'.
3310 /* FINISHME: Correctly handle the nesting. If a switch-statement is
3311 * FINISHME: inside a loop, a 'continue' is valid and will bind to the
3314 if (state
->loop_or_switch_nesting
== NULL
) {
3315 YYLTYPE loc
= this->get_location();
3317 _mesa_glsl_error(& loc
, state
,
3318 "`%s' may only appear in a loop",
3319 (mode
== ast_break
) ? "break" : "continue");
3321 ir_loop
*const loop
= state
->loop_or_switch_nesting
->as_loop();
3323 /* Inline the for loop expression again, since we don't know
3324 * where near the end of the loop body the normal copy of it
3325 * is going to be placed.
3327 if (mode
== ast_continue
&&
3328 state
->loop_or_switch_nesting_ast
->rest_expression
) {
3329 state
->loop_or_switch_nesting_ast
->rest_expression
->hir(instructions
,
3334 ir_loop_jump
*const jump
=
3335 new(ctx
) ir_loop_jump((mode
== ast_break
)
3336 ? ir_loop_jump::jump_break
3337 : ir_loop_jump::jump_continue
);
3338 instructions
->push_tail(jump
);
3345 /* Jump instructions do not have r-values.
3352 ast_selection_statement::hir(exec_list
*instructions
,
3353 struct _mesa_glsl_parse_state
*state
)
3357 ir_rvalue
*const condition
= this->condition
->hir(instructions
, state
);
3359 /* From page 66 (page 72 of the PDF) of the GLSL 1.50 spec:
3361 * "Any expression whose type evaluates to a Boolean can be used as the
3362 * conditional expression bool-expression. Vector types are not accepted
3363 * as the expression to if."
3365 * The checks are separated so that higher quality diagnostics can be
3366 * generated for cases where both rules are violated.
3368 if (!condition
->type
->is_boolean() || !condition
->type
->is_scalar()) {
3369 YYLTYPE loc
= this->condition
->get_location();
3371 _mesa_glsl_error(& loc
, state
, "if-statement condition must be scalar "
3375 ir_if
*const stmt
= new(ctx
) ir_if(condition
);
3377 if (then_statement
!= NULL
) {
3378 state
->symbols
->push_scope();
3379 then_statement
->hir(& stmt
->then_instructions
, state
);
3380 state
->symbols
->pop_scope();
3383 if (else_statement
!= NULL
) {
3384 state
->symbols
->push_scope();
3385 else_statement
->hir(& stmt
->else_instructions
, state
);
3386 state
->symbols
->pop_scope();
3389 instructions
->push_tail(stmt
);
3391 /* if-statements do not have r-values.
3398 ast_iteration_statement::condition_to_hir(ir_loop
*stmt
,
3399 struct _mesa_glsl_parse_state
*state
)
3403 if (condition
!= NULL
) {
3404 ir_rvalue
*const cond
=
3405 condition
->hir(& stmt
->body_instructions
, state
);
3408 || !cond
->type
->is_boolean() || !cond
->type
->is_scalar()) {
3409 YYLTYPE loc
= condition
->get_location();
3411 _mesa_glsl_error(& loc
, state
,
3412 "loop condition must be scalar boolean");
3414 /* As the first code in the loop body, generate a block that looks
3415 * like 'if (!condition) break;' as the loop termination condition.
3417 ir_rvalue
*const not_cond
=
3418 new(ctx
) ir_expression(ir_unop_logic_not
, glsl_type::bool_type
, cond
,
3421 ir_if
*const if_stmt
= new(ctx
) ir_if(not_cond
);
3423 ir_jump
*const break_stmt
=
3424 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
3426 if_stmt
->then_instructions
.push_tail(break_stmt
);
3427 stmt
->body_instructions
.push_tail(if_stmt
);
3434 ast_iteration_statement::hir(exec_list
*instructions
,
3435 struct _mesa_glsl_parse_state
*state
)
3439 /* For-loops and while-loops start a new scope, but do-while loops do not.
3441 if (mode
!= ast_do_while
)
3442 state
->symbols
->push_scope();
3444 if (init_statement
!= NULL
)
3445 init_statement
->hir(instructions
, state
);
3447 ir_loop
*const stmt
= new(ctx
) ir_loop();
3448 instructions
->push_tail(stmt
);
3450 /* Track the current loop and / or switch-statement nesting.
3452 ir_instruction
*const nesting
= state
->loop_or_switch_nesting
;
3453 ast_iteration_statement
*nesting_ast
= state
->loop_or_switch_nesting_ast
;
3455 state
->loop_or_switch_nesting
= stmt
;
3456 state
->loop_or_switch_nesting_ast
= this;
3458 if (mode
!= ast_do_while
)
3459 condition_to_hir(stmt
, state
);
3462 body
->hir(& stmt
->body_instructions
, state
);
3464 if (rest_expression
!= NULL
)
3465 rest_expression
->hir(& stmt
->body_instructions
, state
);
3467 if (mode
== ast_do_while
)
3468 condition_to_hir(stmt
, state
);
3470 if (mode
!= ast_do_while
)
3471 state
->symbols
->pop_scope();
3473 /* Restore previous nesting before returning.
3475 state
->loop_or_switch_nesting
= nesting
;
3476 state
->loop_or_switch_nesting_ast
= nesting_ast
;
3478 /* Loops do not have r-values.
3485 ast_type_specifier::hir(exec_list
*instructions
,
3486 struct _mesa_glsl_parse_state
*state
)
3488 if (!this->is_precision_statement
&& this->structure
== NULL
)
3491 YYLTYPE loc
= this->get_location();
3493 if (this->precision
!= ast_precision_none
3494 && state
->language_version
!= 100
3495 && state
->language_version
< 130) {
3496 _mesa_glsl_error(&loc
, state
,
3497 "precision qualifiers exist only in "
3498 "GLSL ES 1.00, and GLSL 1.30 and later");
3501 if (this->precision
!= ast_precision_none
3502 && this->structure
!= NULL
) {
3503 _mesa_glsl_error(&loc
, state
,
3504 "precision qualifiers do not apply to structures");
3508 /* If this is a precision statement, check that the type to which it is
3509 * applied is either float or int.
3511 * From section 4.5.3 of the GLSL 1.30 spec:
3512 * "The precision statement
3513 * precision precision-qualifier type;
3514 * can be used to establish a default precision qualifier. The type
3515 * field can be either int or float [...]. Any other types or
3516 * qualifiers will result in an error.
3518 if (this->is_precision_statement
) {
3519 assert(this->precision
!= ast_precision_none
);
3520 assert(this->structure
== NULL
); /* The check for structures was
3521 * performed above. */
3522 if (this->is_array
) {
3523 _mesa_glsl_error(&loc
, state
,
3524 "default precision statements do not apply to "
3528 if (this->type_specifier
!= ast_float
3529 && this->type_specifier
!= ast_int
) {
3530 _mesa_glsl_error(&loc
, state
,
3531 "default precision statements apply only to types "
3536 /* FINISHME: Translate precision statements into IR. */
3540 if (this->structure
!= NULL
)
3541 return this->structure
->hir(instructions
, state
);
3548 ast_struct_specifier::hir(exec_list
*instructions
,
3549 struct _mesa_glsl_parse_state
*state
)
3551 unsigned decl_count
= 0;
3553 /* Make an initial pass over the list of structure fields to determine how
3554 * many there are. Each element in this list is an ast_declarator_list.
3555 * This means that we actually need to count the number of elements in the
3556 * 'declarations' list in each of the elements.
3558 foreach_list_typed (ast_declarator_list
, decl_list
, link
,
3559 &this->declarations
) {
3560 foreach_list_const (decl_ptr
, & decl_list
->declarations
) {
3565 /* Allocate storage for the structure fields and process the field
3566 * declarations. As the declarations are processed, try to also convert
3567 * the types to HIR. This ensures that structure definitions embedded in
3568 * other structure definitions are processed.
3570 glsl_struct_field
*const fields
= ralloc_array(state
, glsl_struct_field
,
3574 foreach_list_typed (ast_declarator_list
, decl_list
, link
,
3575 &this->declarations
) {
3576 const char *type_name
;
3578 decl_list
->type
->specifier
->hir(instructions
, state
);
3580 /* Section 10.9 of the GLSL ES 1.00 specification states that
3581 * embedded structure definitions have been removed from the language.
3583 if (state
->es_shader
&& decl_list
->type
->specifier
->structure
!= NULL
) {
3584 YYLTYPE loc
= this->get_location();
3585 _mesa_glsl_error(&loc
, state
, "Embedded structure definitions are "
3586 "not allowed in GLSL ES 1.00.");
3589 const glsl_type
*decl_type
=
3590 decl_list
->type
->specifier
->glsl_type(& type_name
, state
);
3592 foreach_list_typed (ast_declaration
, decl
, link
,
3593 &decl_list
->declarations
) {
3594 const struct glsl_type
*field_type
= decl_type
;
3595 if (decl
->is_array
) {
3596 YYLTYPE loc
= decl
->get_location();
3597 field_type
= process_array_type(&loc
, decl_type
, decl
->array_size
,
3600 fields
[i
].type
= (field_type
!= NULL
)
3601 ? field_type
: glsl_type::error_type
;
3602 fields
[i
].name
= decl
->identifier
;
3607 assert(i
== decl_count
);
3609 const glsl_type
*t
=
3610 glsl_type::get_record_instance(fields
, decl_count
, this->name
);
3612 YYLTYPE loc
= this->get_location();
3613 if (!state
->symbols
->add_type(name
, t
)) {
3614 _mesa_glsl_error(& loc
, state
, "struct `%s' previously defined", name
);
3616 const glsl_type
**s
= reralloc(state
, state
->user_structures
,
3618 state
->num_user_structures
+ 1);
3620 s
[state
->num_user_structures
] = t
;
3621 state
->user_structures
= s
;
3622 state
->num_user_structures
++;
3626 /* Structure type definitions do not have r-values.