2 * Copyright © 2010 Intel Corporation
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
21 * DEALINGS IN THE SOFTWARE.
26 * Convert abstract syntax to to high-level intermediate reprensentation (HIR).
28 * During the conversion to HIR, the majority of the symantic checking is
29 * preformed on the program. This includes:
31 * * Symbol table management
35 * The majority of this work could be done during parsing, and the parser could
36 * probably generate HIR directly. However, this results in frequent changes
37 * to the parser code. Since we do not assume that every system this complier
38 * is built on will have Flex and Bison installed, we have to store the code
39 * generated by these tools in our version control system. In other parts of
40 * the system we've seen problems where a parser was changed but the generated
41 * code was not committed, merge conflicts where created because two developers
42 * had slightly different versions of Bison installed, etc.
44 * I have also noticed that running Bison generated parsers in GDB is very
45 * irritating. When you get a segfault on '$$ = $1->foo', you can't very
46 * well 'print $1' in GDB.
48 * As a result, my preference is to put as little C code as possible in the
49 * parser (and lexer) sources.
52 #include "main/core.h" /* for struct gl_extensions */
53 #include "glsl_symbol_table.h"
54 #include "glsl_parser_extras.h"
56 #include "glsl_types.h"
60 _mesa_ast_to_hir(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
)
62 _mesa_glsl_initialize_variables(instructions
, state
);
64 state
->symbols
->language_version
= state
->language_version
;
66 state
->current_function
= NULL
;
68 state
->toplevel_ir
= instructions
;
70 /* Section 4.2 of the GLSL 1.20 specification states:
71 * "The built-in functions are scoped in a scope outside the global scope
72 * users declare global variables in. That is, a shader's global scope,
73 * available for user-defined functions and global variables, is nested
74 * inside the scope containing the built-in functions."
76 * Since built-in functions like ftransform() access built-in variables,
77 * it follows that those must be in the outer scope as well.
79 * We push scope here to create this nesting effect...but don't pop.
80 * This way, a shader's globals are still in the symbol table for use
83 state
->symbols
->push_scope();
85 foreach_list_typed (ast_node
, ast
, link
, & state
->translation_unit
)
86 ast
->hir(instructions
, state
);
88 detect_recursion_unlinked(state
, instructions
);
90 state
->toplevel_ir
= NULL
;
95 * If a conversion is available, convert one operand to a different type
97 * The \c from \c ir_rvalue is converted "in place".
99 * \param to Type that the operand it to be converted to
100 * \param from Operand that is being converted
101 * \param state GLSL compiler state
104 * If a conversion is possible (or unnecessary), \c true is returned.
105 * Otherwise \c false is returned.
108 apply_implicit_conversion(const glsl_type
*to
, ir_rvalue
* &from
,
109 struct _mesa_glsl_parse_state
*state
)
112 if (to
->base_type
== from
->type
->base_type
)
115 /* This conversion was added in GLSL 1.20. If the compilation mode is
116 * GLSL 1.10, the conversion is skipped.
118 if (state
->language_version
< 120)
121 /* From page 27 (page 33 of the PDF) of the GLSL 1.50 spec:
123 * "There are no implicit array or structure conversions. For
124 * example, an array of int cannot be implicitly converted to an
125 * array of float. There are no implicit conversions between
126 * signed and unsigned integers."
128 /* FINISHME: The above comment is partially a lie. There is int/uint
129 * FINISHME: conversion for immediate constants.
131 if (!to
->is_float() || !from
->type
->is_numeric())
134 /* Convert to a floating point type with the same number of components
135 * as the original type - i.e. int to float, not int to vec4.
137 to
= glsl_type::get_instance(GLSL_TYPE_FLOAT
, from
->type
->vector_elements
,
138 from
->type
->matrix_columns
);
140 switch (from
->type
->base_type
) {
142 from
= new(ctx
) ir_expression(ir_unop_i2f
, to
, from
, NULL
);
145 from
= new(ctx
) ir_expression(ir_unop_u2f
, to
, from
, NULL
);
148 from
= new(ctx
) ir_expression(ir_unop_b2f
, to
, from
, NULL
);
158 static const struct glsl_type
*
159 arithmetic_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
161 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
163 const glsl_type
*type_a
= value_a
->type
;
164 const glsl_type
*type_b
= value_b
->type
;
166 /* From GLSL 1.50 spec, page 56:
168 * "The arithmetic binary operators add (+), subtract (-),
169 * multiply (*), and divide (/) operate on integer and
170 * floating-point scalars, vectors, and matrices."
172 if (!type_a
->is_numeric() || !type_b
->is_numeric()) {
173 _mesa_glsl_error(loc
, state
,
174 "Operands to arithmetic operators must be numeric");
175 return glsl_type::error_type
;
179 /* "If one operand is floating-point based and the other is
180 * not, then the conversions from Section 4.1.10 "Implicit
181 * Conversions" are applied to the non-floating-point-based operand."
183 if (!apply_implicit_conversion(type_a
, value_b
, state
)
184 && !apply_implicit_conversion(type_b
, value_a
, state
)) {
185 _mesa_glsl_error(loc
, state
,
186 "Could not implicitly convert operands to "
187 "arithmetic operator");
188 return glsl_type::error_type
;
190 type_a
= value_a
->type
;
191 type_b
= value_b
->type
;
193 /* "If the operands are integer types, they must both be signed or
196 * From this rule and the preceeding conversion it can be inferred that
197 * both types must be GLSL_TYPE_FLOAT, or GLSL_TYPE_UINT, or GLSL_TYPE_INT.
198 * The is_numeric check above already filtered out the case where either
199 * type is not one of these, so now the base types need only be tested for
202 if (type_a
->base_type
!= type_b
->base_type
) {
203 _mesa_glsl_error(loc
, state
,
204 "base type mismatch for arithmetic operator");
205 return glsl_type::error_type
;
208 /* "All arithmetic binary operators result in the same fundamental type
209 * (signed integer, unsigned integer, or floating-point) as the
210 * operands they operate on, after operand type conversion. After
211 * conversion, the following cases are valid
213 * * The two operands are scalars. In this case the operation is
214 * applied, resulting in a scalar."
216 if (type_a
->is_scalar() && type_b
->is_scalar())
219 /* "* One operand is a scalar, and the other is a vector or matrix.
220 * In this case, the scalar operation is applied independently to each
221 * component of the vector or matrix, resulting in the same size
224 if (type_a
->is_scalar()) {
225 if (!type_b
->is_scalar())
227 } else if (type_b
->is_scalar()) {
231 /* All of the combinations of <scalar, scalar>, <vector, scalar>,
232 * <scalar, vector>, <scalar, matrix>, and <matrix, scalar> have been
235 assert(!type_a
->is_scalar());
236 assert(!type_b
->is_scalar());
238 /* "* The two operands are vectors of the same size. In this case, the
239 * operation is done component-wise resulting in the same size
242 if (type_a
->is_vector() && type_b
->is_vector()) {
243 if (type_a
== type_b
) {
246 _mesa_glsl_error(loc
, state
,
247 "vector size mismatch for arithmetic operator");
248 return glsl_type::error_type
;
252 /* All of the combinations of <scalar, scalar>, <vector, scalar>,
253 * <scalar, vector>, <scalar, matrix>, <matrix, scalar>, and
254 * <vector, vector> have been handled. At least one of the operands must
255 * be matrix. Further, since there are no integer matrix types, the base
256 * type of both operands must be float.
258 assert(type_a
->is_matrix() || type_b
->is_matrix());
259 assert(type_a
->base_type
== GLSL_TYPE_FLOAT
);
260 assert(type_b
->base_type
== GLSL_TYPE_FLOAT
);
262 /* "* The operator is add (+), subtract (-), or divide (/), and the
263 * operands are matrices with the same number of rows and the same
264 * number of columns. In this case, the operation is done component-
265 * wise resulting in the same size matrix."
266 * * The operator is multiply (*), where both operands are matrices or
267 * one operand is a vector and the other a matrix. A right vector
268 * operand is treated as a column vector and a left vector operand as a
269 * row vector. In all these cases, it is required that the number of
270 * columns of the left operand is equal to the number of rows of the
271 * right operand. Then, the multiply (*) operation does a linear
272 * algebraic multiply, yielding an object that has the same number of
273 * rows as the left operand and the same number of columns as the right
274 * operand. Section 5.10 "Vector and Matrix Operations" explains in
275 * more detail how vectors and matrices are operated on."
278 if (type_a
== type_b
)
281 if (type_a
->is_matrix() && type_b
->is_matrix()) {
282 /* Matrix multiply. The columns of A must match the rows of B. Given
283 * the other previously tested constraints, this means the vector type
284 * of a row from A must be the same as the vector type of a column from
287 if (type_a
->row_type() == type_b
->column_type()) {
288 /* The resulting matrix has the number of columns of matrix B and
289 * the number of rows of matrix A. We get the row count of A by
290 * looking at the size of a vector that makes up a column. The
291 * transpose (size of a row) is done for B.
293 const glsl_type
*const type
=
294 glsl_type::get_instance(type_a
->base_type
,
295 type_a
->column_type()->vector_elements
,
296 type_b
->row_type()->vector_elements
);
297 assert(type
!= glsl_type::error_type
);
301 } else if (type_a
->is_matrix()) {
302 /* A is a matrix and B is a column vector. Columns of A must match
303 * rows of B. Given the other previously tested constraints, this
304 * means the vector type of a row from A must be the same as the
305 * vector the type of B.
307 if (type_a
->row_type() == type_b
) {
308 /* The resulting vector has a number of elements equal to
309 * the number of rows of matrix A. */
310 const glsl_type
*const type
=
311 glsl_type::get_instance(type_a
->base_type
,
312 type_a
->column_type()->vector_elements
,
314 assert(type
!= glsl_type::error_type
);
319 assert(type_b
->is_matrix());
321 /* A is a row vector and B is a matrix. Columns of A must match rows
322 * of B. Given the other previously tested constraints, this means
323 * the type of A must be the same as the vector type of a column from
326 if (type_a
== type_b
->column_type()) {
327 /* The resulting vector has a number of elements equal to
328 * the number of columns of matrix B. */
329 const glsl_type
*const type
=
330 glsl_type::get_instance(type_a
->base_type
,
331 type_b
->row_type()->vector_elements
,
333 assert(type
!= glsl_type::error_type
);
339 _mesa_glsl_error(loc
, state
, "size mismatch for matrix multiplication");
340 return glsl_type::error_type
;
344 /* "All other cases are illegal."
346 _mesa_glsl_error(loc
, state
, "type mismatch");
347 return glsl_type::error_type
;
351 static const struct glsl_type
*
352 unary_arithmetic_result_type(const struct glsl_type
*type
,
353 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
355 /* From GLSL 1.50 spec, page 57:
357 * "The arithmetic unary operators negate (-), post- and pre-increment
358 * and decrement (-- and ++) operate on integer or floating-point
359 * values (including vectors and matrices). All unary operators work
360 * component-wise on their operands. These result with the same type
363 if (!type
->is_numeric()) {
364 _mesa_glsl_error(loc
, state
,
365 "Operands to arithmetic operators must be numeric");
366 return glsl_type::error_type
;
373 * \brief Return the result type of a bit-logic operation.
375 * If the given types to the bit-logic operator are invalid, return
376 * glsl_type::error_type.
378 * \param type_a Type of LHS of bit-logic op
379 * \param type_b Type of RHS of bit-logic op
381 static const struct glsl_type
*
382 bit_logic_result_type(const struct glsl_type
*type_a
,
383 const struct glsl_type
*type_b
,
385 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
387 if (state
->language_version
< 130) {
388 _mesa_glsl_error(loc
, state
, "bit operations require GLSL 1.30");
389 return glsl_type::error_type
;
392 /* From page 50 (page 56 of PDF) of GLSL 1.30 spec:
394 * "The bitwise operators and (&), exclusive-or (^), and inclusive-or
395 * (|). The operands must be of type signed or unsigned integers or
398 if (!type_a
->is_integer()) {
399 _mesa_glsl_error(loc
, state
, "LHS of `%s' must be an integer",
400 ast_expression::operator_string(op
));
401 return glsl_type::error_type
;
403 if (!type_b
->is_integer()) {
404 _mesa_glsl_error(loc
, state
, "RHS of `%s' must be an integer",
405 ast_expression::operator_string(op
));
406 return glsl_type::error_type
;
409 /* "The fundamental types of the operands (signed or unsigned) must
412 if (type_a
->base_type
!= type_b
->base_type
) {
413 _mesa_glsl_error(loc
, state
, "operands of `%s' must have the same "
414 "base type", ast_expression::operator_string(op
));
415 return glsl_type::error_type
;
418 /* "The operands cannot be vectors of differing size." */
419 if (type_a
->is_vector() &&
420 type_b
->is_vector() &&
421 type_a
->vector_elements
!= type_b
->vector_elements
) {
422 _mesa_glsl_error(loc
, state
, "operands of `%s' cannot be vectors of "
423 "different sizes", ast_expression::operator_string(op
));
424 return glsl_type::error_type
;
427 /* "If one operand is a scalar and the other a vector, the scalar is
428 * applied component-wise to the vector, resulting in the same type as
429 * the vector. The fundamental types of the operands [...] will be the
430 * resulting fundamental type."
432 if (type_a
->is_scalar())
438 static const struct glsl_type
*
439 modulus_result_type(const struct glsl_type
*type_a
,
440 const struct glsl_type
*type_b
,
441 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
443 if (state
->language_version
< 130) {
444 _mesa_glsl_error(loc
, state
,
445 "operator '%%' is reserved in %s",
446 state
->version_string
);
447 return glsl_type::error_type
;
450 /* From GLSL 1.50 spec, page 56:
451 * "The operator modulus (%) operates on signed or unsigned integers or
452 * integer vectors. The operand types must both be signed or both be
455 if (!type_a
->is_integer()) {
456 _mesa_glsl_error(loc
, state
, "LHS of operator %% must be an integer.");
457 return glsl_type::error_type
;
459 if (!type_b
->is_integer()) {
460 _mesa_glsl_error(loc
, state
, "RHS of operator %% must be an integer.");
461 return glsl_type::error_type
;
463 if (type_a
->base_type
!= type_b
->base_type
) {
464 _mesa_glsl_error(loc
, state
,
465 "operands of %% must have the same base type");
466 return glsl_type::error_type
;
469 /* "The operands cannot be vectors of differing size. If one operand is
470 * a scalar and the other vector, then the scalar is applied component-
471 * wise to the vector, resulting in the same type as the vector. If both
472 * are vectors of the same size, the result is computed component-wise."
474 if (type_a
->is_vector()) {
475 if (!type_b
->is_vector()
476 || (type_a
->vector_elements
== type_b
->vector_elements
))
481 /* "The operator modulus (%) is not defined for any other data types
482 * (non-integer types)."
484 _mesa_glsl_error(loc
, state
, "type mismatch");
485 return glsl_type::error_type
;
489 static const struct glsl_type
*
490 relational_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
491 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
493 const glsl_type
*type_a
= value_a
->type
;
494 const glsl_type
*type_b
= value_b
->type
;
496 /* From GLSL 1.50 spec, page 56:
497 * "The relational operators greater than (>), less than (<), greater
498 * than or equal (>=), and less than or equal (<=) operate only on
499 * scalar integer and scalar floating-point expressions."
501 if (!type_a
->is_numeric()
502 || !type_b
->is_numeric()
503 || !type_a
->is_scalar()
504 || !type_b
->is_scalar()) {
505 _mesa_glsl_error(loc
, state
,
506 "Operands to relational operators must be scalar and "
508 return glsl_type::error_type
;
511 /* "Either the operands' types must match, or the conversions from
512 * Section 4.1.10 "Implicit Conversions" will be applied to the integer
513 * operand, after which the types must match."
515 if (!apply_implicit_conversion(type_a
, value_b
, state
)
516 && !apply_implicit_conversion(type_b
, value_a
, state
)) {
517 _mesa_glsl_error(loc
, state
,
518 "Could not implicitly convert operands to "
519 "relational operator");
520 return glsl_type::error_type
;
522 type_a
= value_a
->type
;
523 type_b
= value_b
->type
;
525 if (type_a
->base_type
!= type_b
->base_type
) {
526 _mesa_glsl_error(loc
, state
, "base type mismatch");
527 return glsl_type::error_type
;
530 /* "The result is scalar Boolean."
532 return glsl_type::bool_type
;
536 * \brief Return the result type of a bit-shift operation.
538 * If the given types to the bit-shift operator are invalid, return
539 * glsl_type::error_type.
541 * \param type_a Type of LHS of bit-shift op
542 * \param type_b Type of RHS of bit-shift op
544 static const struct glsl_type
*
545 shift_result_type(const struct glsl_type
*type_a
,
546 const struct glsl_type
*type_b
,
548 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
550 if (state
->language_version
< 130) {
551 _mesa_glsl_error(loc
, state
, "bit operations require GLSL 1.30");
552 return glsl_type::error_type
;
555 /* From page 50 (page 56 of the PDF) of the GLSL 1.30 spec:
557 * "The shift operators (<<) and (>>). For both operators, the operands
558 * must be signed or unsigned integers or integer vectors. One operand
559 * can be signed while the other is unsigned."
561 if (!type_a
->is_integer()) {
562 _mesa_glsl_error(loc
, state
, "LHS of operator %s must be an integer or "
563 "integer vector", ast_expression::operator_string(op
));
564 return glsl_type::error_type
;
567 if (!type_b
->is_integer()) {
568 _mesa_glsl_error(loc
, state
, "RHS of operator %s must be an integer or "
569 "integer vector", ast_expression::operator_string(op
));
570 return glsl_type::error_type
;
573 /* "If the first operand is a scalar, the second operand has to be
576 if (type_a
->is_scalar() && !type_b
->is_scalar()) {
577 _mesa_glsl_error(loc
, state
, "If the first operand of %s is scalar, the "
578 "second must be scalar as well",
579 ast_expression::operator_string(op
));
580 return glsl_type::error_type
;
583 /* If both operands are vectors, check that they have same number of
586 if (type_a
->is_vector() &&
587 type_b
->is_vector() &&
588 type_a
->vector_elements
!= type_b
->vector_elements
) {
589 _mesa_glsl_error(loc
, state
, "Vector operands to operator %s must "
590 "have same number of elements",
591 ast_expression::operator_string(op
));
592 return glsl_type::error_type
;
595 /* "In all cases, the resulting type will be the same type as the left
602 * Validates that a value can be assigned to a location with a specified type
604 * Validates that \c rhs can be assigned to some location. If the types are
605 * not an exact match but an automatic conversion is possible, \c rhs will be
609 * \c NULL if \c rhs cannot be assigned to a location with type \c lhs_type.
610 * Otherwise the actual RHS to be assigned will be returned. This may be
611 * \c rhs, or it may be \c rhs after some type conversion.
614 * In addition to being used for assignments, this function is used to
615 * type-check return values.
618 validate_assignment(struct _mesa_glsl_parse_state
*state
,
619 const glsl_type
*lhs_type
, ir_rvalue
*rhs
,
622 /* If there is already some error in the RHS, just return it. Anything
623 * else will lead to an avalanche of error message back to the user.
625 if (rhs
->type
->is_error())
628 /* If the types are identical, the assignment can trivially proceed.
630 if (rhs
->type
== lhs_type
)
633 /* If the array element types are the same and the size of the LHS is zero,
634 * the assignment is okay for initializers embedded in variable
637 * Note: Whole-array assignments are not permitted in GLSL 1.10, but this
638 * is handled by ir_dereference::is_lvalue.
640 if (is_initializer
&& lhs_type
->is_array() && rhs
->type
->is_array()
641 && (lhs_type
->element_type() == rhs
->type
->element_type())
642 && (lhs_type
->array_size() == 0)) {
646 /* Check for implicit conversion in GLSL 1.20 */
647 if (apply_implicit_conversion(lhs_type
, rhs
, state
)) {
648 if (rhs
->type
== lhs_type
)
656 mark_whole_array_access(ir_rvalue
*access
)
658 ir_dereference_variable
*deref
= access
->as_dereference_variable();
660 if (deref
&& deref
->var
) {
661 deref
->var
->max_array_access
= deref
->type
->length
- 1;
666 do_assignment(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
,
667 const char *non_lvalue_description
,
668 ir_rvalue
*lhs
, ir_rvalue
*rhs
, bool is_initializer
,
672 bool error_emitted
= (lhs
->type
->is_error() || rhs
->type
->is_error());
674 if (!error_emitted
) {
675 if (non_lvalue_description
!= NULL
) {
676 _mesa_glsl_error(&lhs_loc
, state
,
678 non_lvalue_description
);
679 error_emitted
= true;
680 } else if (lhs
->variable_referenced() != NULL
681 && lhs
->variable_referenced()->read_only
) {
682 _mesa_glsl_error(&lhs_loc
, state
,
683 "assignment to read-only variable '%s'",
684 lhs
->variable_referenced()->name
);
685 error_emitted
= true;
687 } else if (state
->language_version
<= 110 && lhs
->type
->is_array()) {
688 /* From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
690 * "Other binary or unary expressions, non-dereferenced
691 * arrays, function names, swizzles with repeated fields,
692 * and constants cannot be l-values."
694 _mesa_glsl_error(&lhs_loc
, state
, "whole array assignment is not "
695 "allowed in GLSL 1.10 or GLSL ES 1.00.");
696 error_emitted
= true;
697 } else if (!lhs
->is_lvalue()) {
698 _mesa_glsl_error(& lhs_loc
, state
, "non-lvalue in assignment");
699 error_emitted
= true;
704 validate_assignment(state
, lhs
->type
, rhs
, is_initializer
);
705 if (new_rhs
== NULL
) {
706 _mesa_glsl_error(& lhs_loc
, state
, "type mismatch");
710 /* If the LHS array was not declared with a size, it takes it size from
711 * the RHS. If the LHS is an l-value and a whole array, it must be a
712 * dereference of a variable. Any other case would require that the LHS
713 * is either not an l-value or not a whole array.
715 if (lhs
->type
->array_size() == 0) {
716 ir_dereference
*const d
= lhs
->as_dereference();
720 ir_variable
*const var
= d
->variable_referenced();
724 if (var
->max_array_access
>= unsigned(rhs
->type
->array_size())) {
725 /* FINISHME: This should actually log the location of the RHS. */
726 _mesa_glsl_error(& lhs_loc
, state
, "array size must be > %u due to "
728 var
->max_array_access
);
731 var
->type
= glsl_type::get_array_instance(lhs
->type
->element_type(),
732 rhs
->type
->array_size());
735 mark_whole_array_access(rhs
);
736 mark_whole_array_access(lhs
);
739 /* Most callers of do_assignment (assign, add_assign, pre_inc/dec,
740 * but not post_inc) need the converted assigned value as an rvalue
741 * to handle things like:
745 * So we always just store the computed value being assigned to a
746 * temporary and return a deref of that temporary. If the rvalue
747 * ends up not being used, the temp will get copy-propagated out.
749 ir_variable
*var
= new(ctx
) ir_variable(rhs
->type
, "assignment_tmp",
751 ir_dereference_variable
*deref_var
= new(ctx
) ir_dereference_variable(var
);
752 instructions
->push_tail(var
);
753 instructions
->push_tail(new(ctx
) ir_assignment(deref_var
,
756 deref_var
= new(ctx
) ir_dereference_variable(var
);
759 instructions
->push_tail(new(ctx
) ir_assignment(lhs
, deref_var
, NULL
));
761 return new(ctx
) ir_dereference_variable(var
);
765 get_lvalue_copy(exec_list
*instructions
, ir_rvalue
*lvalue
)
767 void *ctx
= ralloc_parent(lvalue
);
770 var
= new(ctx
) ir_variable(lvalue
->type
, "_post_incdec_tmp",
772 instructions
->push_tail(var
);
773 var
->mode
= ir_var_auto
;
775 instructions
->push_tail(new(ctx
) ir_assignment(new(ctx
) ir_dereference_variable(var
),
778 /* Once we've created this temporary, mark it read only so it's no
779 * longer considered an lvalue.
781 var
->read_only
= true;
783 return new(ctx
) ir_dereference_variable(var
);
788 ast_node::hir(exec_list
*instructions
,
789 struct _mesa_glsl_parse_state
*state
)
798 do_comparison(void *mem_ctx
, int operation
, ir_rvalue
*op0
, ir_rvalue
*op1
)
801 ir_rvalue
*cmp
= NULL
;
803 if (operation
== ir_binop_all_equal
)
804 join_op
= ir_binop_logic_and
;
806 join_op
= ir_binop_logic_or
;
808 switch (op0
->type
->base_type
) {
809 case GLSL_TYPE_FLOAT
:
813 return new(mem_ctx
) ir_expression(operation
, op0
, op1
);
815 case GLSL_TYPE_ARRAY
: {
816 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
817 ir_rvalue
*e0
, *e1
, *result
;
819 e0
= new(mem_ctx
) ir_dereference_array(op0
->clone(mem_ctx
, NULL
),
820 new(mem_ctx
) ir_constant(i
));
821 e1
= new(mem_ctx
) ir_dereference_array(op1
->clone(mem_ctx
, NULL
),
822 new(mem_ctx
) ir_constant(i
));
823 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
826 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
832 mark_whole_array_access(op0
);
833 mark_whole_array_access(op1
);
837 case GLSL_TYPE_STRUCT
: {
838 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
839 ir_rvalue
*e0
, *e1
, *result
;
840 const char *field_name
= op0
->type
->fields
.structure
[i
].name
;
842 e0
= new(mem_ctx
) ir_dereference_record(op0
->clone(mem_ctx
, NULL
),
844 e1
= new(mem_ctx
) ir_dereference_record(op1
->clone(mem_ctx
, NULL
),
846 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
849 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
857 case GLSL_TYPE_ERROR
:
859 case GLSL_TYPE_SAMPLER
:
860 /* I assume a comparison of a struct containing a sampler just
861 * ignores the sampler present in the type.
866 assert(!"Should not get here.");
871 cmp
= new(mem_ctx
) ir_constant(true);
876 /* For logical operations, we want to ensure that the operands are
877 * scalar booleans. If it isn't, emit an error and return a constant
878 * boolean to avoid triggering cascading error messages.
881 get_scalar_boolean_operand(exec_list
*instructions
,
882 struct _mesa_glsl_parse_state
*state
,
883 ast_expression
*parent_expr
,
885 const char *operand_name
,
888 ast_expression
*expr
= parent_expr
->subexpressions
[operand
];
890 ir_rvalue
*val
= expr
->hir(instructions
, state
);
892 if (val
->type
->is_boolean() && val
->type
->is_scalar())
895 if (!*error_emitted
) {
896 YYLTYPE loc
= expr
->get_location();
897 _mesa_glsl_error(&loc
, state
, "%s of `%s' must be scalar boolean",
899 parent_expr
->operator_string(parent_expr
->oper
));
900 *error_emitted
= true;
903 return new(ctx
) ir_constant(true);
907 * If name refers to a builtin array whose maximum allowed size is less than
908 * size, report an error and return true. Otherwise return false.
911 check_builtin_array_max_size(const char *name
, unsigned size
,
912 YYLTYPE loc
, struct _mesa_glsl_parse_state
*state
)
914 if ((strcmp("gl_TexCoord", name
) == 0)
915 && (size
> state
->Const
.MaxTextureCoords
)) {
916 /* From page 54 (page 60 of the PDF) of the GLSL 1.20 spec:
918 * "The size [of gl_TexCoord] can be at most
919 * gl_MaxTextureCoords."
921 _mesa_glsl_error(&loc
, state
, "`gl_TexCoord' array size cannot "
922 "be larger than gl_MaxTextureCoords (%u)\n",
923 state
->Const
.MaxTextureCoords
);
925 } else if (strcmp("gl_ClipDistance", name
) == 0
926 && size
> state
->Const
.MaxClipPlanes
) {
927 /* From section 7.1 (Vertex Shader Special Variables) of the
930 * "The gl_ClipDistance array is predeclared as unsized and
931 * must be sized by the shader either redeclaring it with a
932 * size or indexing it only with integral constant
933 * expressions. ... The size can be at most
934 * gl_MaxClipDistances."
936 _mesa_glsl_error(&loc
, state
, "`gl_ClipDistance' array size cannot "
937 "be larger than gl_MaxClipDistances (%u)\n",
938 state
->Const
.MaxClipPlanes
);
945 * Create the constant 1, of a which is appropriate for incrementing and
946 * decrementing values of the given GLSL type. For example, if type is vec4,
947 * this creates a constant value of 1.0 having type float.
949 * If the given type is invalid for increment and decrement operators, return
950 * a floating point 1--the error will be detected later.
953 constant_one_for_inc_dec(void *ctx
, const glsl_type
*type
)
955 switch (type
->base_type
) {
957 return new(ctx
) ir_constant((unsigned) 1);
959 return new(ctx
) ir_constant(1);
961 case GLSL_TYPE_FLOAT
:
962 return new(ctx
) ir_constant(1.0f
);
967 ast_expression::hir(exec_list
*instructions
,
968 struct _mesa_glsl_parse_state
*state
)
971 static const int operations
[AST_NUM_OPERATORS
] = {
972 -1, /* ast_assign doesn't convert to ir_expression. */
973 -1, /* ast_plus doesn't convert to ir_expression. */
997 /* Note: The following block of expression types actually convert
998 * to multiple IR instructions.
1000 ir_binop_mul
, /* ast_mul_assign */
1001 ir_binop_div
, /* ast_div_assign */
1002 ir_binop_mod
, /* ast_mod_assign */
1003 ir_binop_add
, /* ast_add_assign */
1004 ir_binop_sub
, /* ast_sub_assign */
1005 ir_binop_lshift
, /* ast_ls_assign */
1006 ir_binop_rshift
, /* ast_rs_assign */
1007 ir_binop_bit_and
, /* ast_and_assign */
1008 ir_binop_bit_xor
, /* ast_xor_assign */
1009 ir_binop_bit_or
, /* ast_or_assign */
1011 -1, /* ast_conditional doesn't convert to ir_expression. */
1012 ir_binop_add
, /* ast_pre_inc. */
1013 ir_binop_sub
, /* ast_pre_dec. */
1014 ir_binop_add
, /* ast_post_inc. */
1015 ir_binop_sub
, /* ast_post_dec. */
1016 -1, /* ast_field_selection doesn't conv to ir_expression. */
1017 -1, /* ast_array_index doesn't convert to ir_expression. */
1018 -1, /* ast_function_call doesn't conv to ir_expression. */
1019 -1, /* ast_identifier doesn't convert to ir_expression. */
1020 -1, /* ast_int_constant doesn't convert to ir_expression. */
1021 -1, /* ast_uint_constant doesn't conv to ir_expression. */
1022 -1, /* ast_float_constant doesn't conv to ir_expression. */
1023 -1, /* ast_bool_constant doesn't conv to ir_expression. */
1024 -1, /* ast_sequence doesn't convert to ir_expression. */
1026 ir_rvalue
*result
= NULL
;
1028 const struct glsl_type
*type
; /* a temporary variable for switch cases */
1029 bool error_emitted
= false;
1032 loc
= this->get_location();
1034 switch (this->oper
) {
1036 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1037 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1039 result
= do_assignment(instructions
, state
,
1040 this->subexpressions
[0]->non_lvalue_description
,
1041 op
[0], op
[1], false,
1042 this->subexpressions
[0]->get_location());
1043 error_emitted
= result
->type
->is_error();
1048 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1050 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1052 error_emitted
= type
->is_error();
1058 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1060 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1062 error_emitted
= type
->is_error();
1064 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1072 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1073 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1075 type
= arithmetic_result_type(op
[0], op
[1],
1076 (this->oper
== ast_mul
),
1078 error_emitted
= type
->is_error();
1080 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1085 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1086 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1088 type
= modulus_result_type(op
[0]->type
, op
[1]->type
, state
, & loc
);
1090 assert(operations
[this->oper
] == ir_binop_mod
);
1092 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1094 error_emitted
= type
->is_error();
1099 if (state
->language_version
< 130) {
1100 _mesa_glsl_error(&loc
, state
, "operator %s requires GLSL 1.30",
1101 operator_string(this->oper
));
1102 error_emitted
= true;
1105 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1106 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1107 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1109 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1111 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1118 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1119 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1121 type
= relational_result_type(op
[0], op
[1], state
, & loc
);
1123 /* The relational operators must either generate an error or result
1124 * in a scalar boolean. See page 57 of the GLSL 1.50 spec.
1126 assert(type
->is_error()
1127 || ((type
->base_type
== GLSL_TYPE_BOOL
)
1128 && type
->is_scalar()));
1130 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1132 error_emitted
= type
->is_error();
1137 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1138 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1140 /* From page 58 (page 64 of the PDF) of the GLSL 1.50 spec:
1142 * "The equality operators equal (==), and not equal (!=)
1143 * operate on all types. They result in a scalar Boolean. If
1144 * the operand types do not match, then there must be a
1145 * conversion from Section 4.1.10 "Implicit Conversions"
1146 * applied to one operand that can make them match, in which
1147 * case this conversion is done."
1149 if ((!apply_implicit_conversion(op
[0]->type
, op
[1], state
)
1150 && !apply_implicit_conversion(op
[1]->type
, op
[0], state
))
1151 || (op
[0]->type
!= op
[1]->type
)) {
1152 _mesa_glsl_error(& loc
, state
, "operands of `%s' must have the same "
1153 "type", (this->oper
== ast_equal
) ? "==" : "!=");
1154 error_emitted
= true;
1155 } else if ((state
->language_version
<= 110)
1156 && (op
[0]->type
->is_array() || op
[1]->type
->is_array())) {
1157 _mesa_glsl_error(& loc
, state
, "array comparisons forbidden in "
1159 error_emitted
= true;
1162 if (error_emitted
) {
1163 result
= new(ctx
) ir_constant(false);
1165 result
= do_comparison(ctx
, operations
[this->oper
], op
[0], op
[1]);
1166 assert(result
->type
== glsl_type::bool_type
);
1173 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1174 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1175 type
= bit_logic_result_type(op
[0]->type
, op
[1]->type
, this->oper
,
1177 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1179 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1183 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1185 if (state
->language_version
< 130) {
1186 _mesa_glsl_error(&loc
, state
, "bit-wise operations require GLSL 1.30");
1187 error_emitted
= true;
1190 if (!op
[0]->type
->is_integer()) {
1191 _mesa_glsl_error(&loc
, state
, "operand of `~' must be an integer");
1192 error_emitted
= true;
1195 type
= error_emitted
? glsl_type::error_type
: op
[0]->type
;
1196 result
= new(ctx
) ir_expression(ir_unop_bit_not
, type
, op
[0], NULL
);
1199 case ast_logic_and
: {
1200 exec_list rhs_instructions
;
1201 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1202 "LHS", &error_emitted
);
1203 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1204 "RHS", &error_emitted
);
1206 ir_constant
*op0_const
= op
[0]->constant_expression_value();
1208 if (op0_const
->value
.b
[0]) {
1209 instructions
->append_list(&rhs_instructions
);
1214 type
= glsl_type::bool_type
;
1216 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1219 instructions
->push_tail(tmp
);
1221 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1222 instructions
->push_tail(stmt
);
1224 stmt
->then_instructions
.append_list(&rhs_instructions
);
1225 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1226 ir_assignment
*const then_assign
=
1227 new(ctx
) ir_assignment(then_deref
, op
[1], NULL
);
1228 stmt
->then_instructions
.push_tail(then_assign
);
1230 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1231 ir_assignment
*const else_assign
=
1232 new(ctx
) ir_assignment(else_deref
, new(ctx
) ir_constant(false), NULL
);
1233 stmt
->else_instructions
.push_tail(else_assign
);
1235 result
= new(ctx
) ir_dereference_variable(tmp
);
1241 case ast_logic_or
: {
1242 exec_list rhs_instructions
;
1243 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1244 "LHS", &error_emitted
);
1245 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1246 "RHS", &error_emitted
);
1248 ir_constant
*op0_const
= op
[0]->constant_expression_value();
1250 if (op0_const
->value
.b
[0]) {
1255 type
= glsl_type::bool_type
;
1257 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1260 instructions
->push_tail(tmp
);
1262 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1263 instructions
->push_tail(stmt
);
1265 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1266 ir_assignment
*const then_assign
=
1267 new(ctx
) ir_assignment(then_deref
, new(ctx
) ir_constant(true), NULL
);
1268 stmt
->then_instructions
.push_tail(then_assign
);
1270 stmt
->else_instructions
.append_list(&rhs_instructions
);
1271 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1272 ir_assignment
*const else_assign
=
1273 new(ctx
) ir_assignment(else_deref
, op
[1], NULL
);
1274 stmt
->else_instructions
.push_tail(else_assign
);
1276 result
= new(ctx
) ir_dereference_variable(tmp
);
1283 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1285 * "The logical binary operators and (&&), or ( | | ), and
1286 * exclusive or (^^). They operate only on two Boolean
1287 * expressions and result in a Boolean expression."
1289 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0, "LHS",
1291 op
[1] = get_scalar_boolean_operand(instructions
, state
, this, 1, "RHS",
1294 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1299 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1300 "operand", &error_emitted
);
1302 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1306 case ast_mul_assign
:
1307 case ast_div_assign
:
1308 case ast_add_assign
:
1309 case ast_sub_assign
: {
1310 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1311 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1313 type
= arithmetic_result_type(op
[0], op
[1],
1314 (this->oper
== ast_mul_assign
),
1317 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1320 result
= do_assignment(instructions
, state
,
1321 this->subexpressions
[0]->non_lvalue_description
,
1322 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1323 this->subexpressions
[0]->get_location());
1324 error_emitted
= (op
[0]->type
->is_error());
1326 /* GLSL 1.10 does not allow array assignment. However, we don't have to
1327 * explicitly test for this because none of the binary expression
1328 * operators allow array operands either.
1334 case ast_mod_assign
: {
1335 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1336 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1338 type
= modulus_result_type(op
[0]->type
, op
[1]->type
, state
, & loc
);
1340 assert(operations
[this->oper
] == ir_binop_mod
);
1342 ir_rvalue
*temp_rhs
;
1343 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1346 result
= do_assignment(instructions
, state
,
1347 this->subexpressions
[0]->non_lvalue_description
,
1348 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1349 this->subexpressions
[0]->get_location());
1350 error_emitted
= type
->is_error();
1355 case ast_rs_assign
: {
1356 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1357 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1358 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1360 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1361 type
, op
[0], op
[1]);
1362 result
= do_assignment(instructions
, state
,
1363 this->subexpressions
[0]->non_lvalue_description
,
1364 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1365 this->subexpressions
[0]->get_location());
1366 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1370 case ast_and_assign
:
1371 case ast_xor_assign
:
1372 case ast_or_assign
: {
1373 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1374 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1375 type
= bit_logic_result_type(op
[0]->type
, op
[1]->type
, this->oper
,
1377 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1378 type
, op
[0], op
[1]);
1379 result
= do_assignment(instructions
, state
,
1380 this->subexpressions
[0]->non_lvalue_description
,
1381 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1382 this->subexpressions
[0]->get_location());
1383 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1387 case ast_conditional
: {
1388 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1390 * "The ternary selection operator (?:). It operates on three
1391 * expressions (exp1 ? exp2 : exp3). This operator evaluates the
1392 * first expression, which must result in a scalar Boolean."
1394 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1395 "condition", &error_emitted
);
1397 /* The :? operator is implemented by generating an anonymous temporary
1398 * followed by an if-statement. The last instruction in each branch of
1399 * the if-statement assigns a value to the anonymous temporary. This
1400 * temporary is the r-value of the expression.
1402 exec_list then_instructions
;
1403 exec_list else_instructions
;
1405 op
[1] = this->subexpressions
[1]->hir(&then_instructions
, state
);
1406 op
[2] = this->subexpressions
[2]->hir(&else_instructions
, state
);
1408 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1410 * "The second and third expressions can be any type, as
1411 * long their types match, or there is a conversion in
1412 * Section 4.1.10 "Implicit Conversions" that can be applied
1413 * to one of the expressions to make their types match. This
1414 * resulting matching type is the type of the entire
1417 if ((!apply_implicit_conversion(op
[1]->type
, op
[2], state
)
1418 && !apply_implicit_conversion(op
[2]->type
, op
[1], state
))
1419 || (op
[1]->type
!= op
[2]->type
)) {
1420 YYLTYPE loc
= this->subexpressions
[1]->get_location();
1422 _mesa_glsl_error(& loc
, state
, "Second and third operands of ?: "
1423 "operator must have matching types.");
1424 error_emitted
= true;
1425 type
= glsl_type::error_type
;
1430 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1432 * "The second and third expressions must be the same type, but can
1433 * be of any type other than an array."
1435 if ((state
->language_version
<= 110) && type
->is_array()) {
1436 _mesa_glsl_error(& loc
, state
, "Second and third operands of ?: "
1437 "operator must not be arrays.");
1438 error_emitted
= true;
1441 ir_constant
*cond_val
= op
[0]->constant_expression_value();
1442 ir_constant
*then_val
= op
[1]->constant_expression_value();
1443 ir_constant
*else_val
= op
[2]->constant_expression_value();
1445 if (then_instructions
.is_empty()
1446 && else_instructions
.is_empty()
1447 && (cond_val
!= NULL
) && (then_val
!= NULL
) && (else_val
!= NULL
)) {
1448 result
= (cond_val
->value
.b
[0]) ? then_val
: else_val
;
1450 ir_variable
*const tmp
=
1451 new(ctx
) ir_variable(type
, "conditional_tmp", ir_var_temporary
);
1452 instructions
->push_tail(tmp
);
1454 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1455 instructions
->push_tail(stmt
);
1457 then_instructions
.move_nodes_to(& stmt
->then_instructions
);
1458 ir_dereference
*const then_deref
=
1459 new(ctx
) ir_dereference_variable(tmp
);
1460 ir_assignment
*const then_assign
=
1461 new(ctx
) ir_assignment(then_deref
, op
[1], NULL
);
1462 stmt
->then_instructions
.push_tail(then_assign
);
1464 else_instructions
.move_nodes_to(& stmt
->else_instructions
);
1465 ir_dereference
*const else_deref
=
1466 new(ctx
) ir_dereference_variable(tmp
);
1467 ir_assignment
*const else_assign
=
1468 new(ctx
) ir_assignment(else_deref
, op
[2], NULL
);
1469 stmt
->else_instructions
.push_tail(else_assign
);
1471 result
= new(ctx
) ir_dereference_variable(tmp
);
1478 this->non_lvalue_description
= (this->oper
== ast_pre_inc
)
1479 ? "pre-increment operation" : "pre-decrement operation";
1481 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1482 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1484 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1486 ir_rvalue
*temp_rhs
;
1487 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1490 result
= do_assignment(instructions
, state
,
1491 this->subexpressions
[0]->non_lvalue_description
,
1492 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1493 this->subexpressions
[0]->get_location());
1494 error_emitted
= op
[0]->type
->is_error();
1499 case ast_post_dec
: {
1500 this->non_lvalue_description
= (this->oper
== ast_post_inc
)
1501 ? "post-increment operation" : "post-decrement operation";
1502 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1503 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1505 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1507 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1509 ir_rvalue
*temp_rhs
;
1510 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1513 /* Get a temporary of a copy of the lvalue before it's modified.
1514 * This may get thrown away later.
1516 result
= get_lvalue_copy(instructions
, op
[0]->clone(ctx
, NULL
));
1518 (void)do_assignment(instructions
, state
,
1519 this->subexpressions
[0]->non_lvalue_description
,
1520 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1521 this->subexpressions
[0]->get_location());
1523 error_emitted
= op
[0]->type
->is_error();
1527 case ast_field_selection
:
1528 result
= _mesa_ast_field_selection_to_hir(this, instructions
, state
);
1531 case ast_array_index
: {
1532 YYLTYPE index_loc
= subexpressions
[1]->get_location();
1534 op
[0] = subexpressions
[0]->hir(instructions
, state
);
1535 op
[1] = subexpressions
[1]->hir(instructions
, state
);
1537 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1539 ir_rvalue
*const array
= op
[0];
1541 result
= new(ctx
) ir_dereference_array(op
[0], op
[1]);
1543 /* Do not use op[0] after this point. Use array.
1551 if (!array
->type
->is_array()
1552 && !array
->type
->is_matrix()
1553 && !array
->type
->is_vector()) {
1554 _mesa_glsl_error(& index_loc
, state
,
1555 "cannot dereference non-array / non-matrix / "
1557 error_emitted
= true;
1560 if (!op
[1]->type
->is_integer()) {
1561 _mesa_glsl_error(& index_loc
, state
,
1562 "array index must be integer type");
1563 error_emitted
= true;
1564 } else if (!op
[1]->type
->is_scalar()) {
1565 _mesa_glsl_error(& index_loc
, state
,
1566 "array index must be scalar");
1567 error_emitted
= true;
1570 /* If the array index is a constant expression and the array has a
1571 * declared size, ensure that the access is in-bounds. If the array
1572 * index is not a constant expression, ensure that the array has a
1575 ir_constant
*const const_index
= op
[1]->constant_expression_value();
1576 if (const_index
!= NULL
) {
1577 const int idx
= const_index
->value
.i
[0];
1578 const char *type_name
;
1581 if (array
->type
->is_matrix()) {
1582 type_name
= "matrix";
1583 } else if (array
->type
->is_vector()) {
1584 type_name
= "vector";
1586 type_name
= "array";
1589 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec:
1591 * "It is illegal to declare an array with a size, and then
1592 * later (in the same shader) index the same array with an
1593 * integral constant expression greater than or equal to the
1594 * declared size. It is also illegal to index an array with a
1595 * negative constant expression."
1597 if (array
->type
->is_matrix()) {
1598 if (array
->type
->row_type()->vector_elements
<= idx
) {
1599 bound
= array
->type
->row_type()->vector_elements
;
1601 } else if (array
->type
->is_vector()) {
1602 if (array
->type
->vector_elements
<= idx
) {
1603 bound
= array
->type
->vector_elements
;
1606 if ((array
->type
->array_size() > 0)
1607 && (array
->type
->array_size() <= idx
)) {
1608 bound
= array
->type
->array_size();
1613 _mesa_glsl_error(& loc
, state
, "%s index must be < %u",
1615 error_emitted
= true;
1616 } else if (idx
< 0) {
1617 _mesa_glsl_error(& loc
, state
, "%s index must be >= 0",
1619 error_emitted
= true;
1622 if (array
->type
->is_array()) {
1623 /* If the array is a variable dereference, it dereferences the
1624 * whole array, by definition. Use this to get the variable.
1626 * FINISHME: Should some methods for getting / setting / testing
1627 * FINISHME: array access limits be added to ir_dereference?
1629 ir_variable
*const v
= array
->whole_variable_referenced();
1630 if ((v
!= NULL
) && (unsigned(idx
) > v
->max_array_access
)) {
1631 v
->max_array_access
= idx
;
1633 /* Check whether this access will, as a side effect, implicitly
1634 * cause the size of a built-in array to be too large.
1636 if (check_builtin_array_max_size(v
->name
, idx
+1, loc
, state
))
1637 error_emitted
= true;
1640 } else if (array
->type
->array_size() == 0) {
1641 _mesa_glsl_error(&loc
, state
, "unsized array index must be constant");
1643 if (array
->type
->is_array()) {
1644 /* whole_variable_referenced can return NULL if the array is a
1645 * member of a structure. In this case it is safe to not update
1646 * the max_array_access field because it is never used for fields
1649 ir_variable
*v
= array
->whole_variable_referenced();
1651 v
->max_array_access
= array
->type
->array_size() - 1;
1655 /* From page 23 (29 of the PDF) of the GLSL 1.30 spec:
1657 * "Samplers aggregated into arrays within a shader (using square
1658 * brackets [ ]) can only be indexed with integral constant
1659 * expressions [...]."
1661 * This restriction was added in GLSL 1.30. Shaders using earlier version
1662 * of the language should not be rejected by the compiler front-end for
1663 * using this construct. This allows useful things such as using a loop
1664 * counter as the index to an array of samplers. If the loop in unrolled,
1665 * the code should compile correctly. Instead, emit a warning.
1667 if (array
->type
->is_array() &&
1668 array
->type
->element_type()->is_sampler() &&
1669 const_index
== NULL
) {
1671 if (state
->language_version
== 100) {
1672 _mesa_glsl_warning(&loc
, state
,
1673 "sampler arrays indexed with non-constant "
1674 "expressions is optional in GLSL ES 1.00");
1675 } else if (state
->language_version
< 130) {
1676 _mesa_glsl_warning(&loc
, state
,
1677 "sampler arrays indexed with non-constant "
1678 "expressions is forbidden in GLSL 1.30 and "
1681 _mesa_glsl_error(&loc
, state
,
1682 "sampler arrays indexed with non-constant "
1683 "expressions is forbidden in GLSL 1.30 and "
1685 error_emitted
= true;
1690 result
->type
= glsl_type::error_type
;
1695 case ast_function_call
:
1696 /* Should *NEVER* get here. ast_function_call should always be handled
1697 * by ast_function_expression::hir.
1702 case ast_identifier
: {
1703 /* ast_identifier can appear several places in a full abstract syntax
1704 * tree. This particular use must be at location specified in the grammar
1705 * as 'variable_identifier'.
1708 state
->symbols
->get_variable(this->primary_expression
.identifier
);
1710 result
= new(ctx
) ir_dereference_variable(var
);
1715 _mesa_glsl_error(& loc
, state
, "`%s' undeclared",
1716 this->primary_expression
.identifier
);
1718 error_emitted
= true;
1723 case ast_int_constant
:
1724 result
= new(ctx
) ir_constant(this->primary_expression
.int_constant
);
1727 case ast_uint_constant
:
1728 result
= new(ctx
) ir_constant(this->primary_expression
.uint_constant
);
1731 case ast_float_constant
:
1732 result
= new(ctx
) ir_constant(this->primary_expression
.float_constant
);
1735 case ast_bool_constant
:
1736 result
= new(ctx
) ir_constant(bool(this->primary_expression
.bool_constant
));
1739 case ast_sequence
: {
1740 /* It should not be possible to generate a sequence in the AST without
1741 * any expressions in it.
1743 assert(!this->expressions
.is_empty());
1745 /* The r-value of a sequence is the last expression in the sequence. If
1746 * the other expressions in the sequence do not have side-effects (and
1747 * therefore add instructions to the instruction list), they get dropped
1750 exec_node
*previous_tail_pred
= NULL
;
1751 YYLTYPE previous_operand_loc
= loc
;
1753 foreach_list_typed (ast_node
, ast
, link
, &this->expressions
) {
1754 /* If one of the operands of comma operator does not generate any
1755 * code, we want to emit a warning. At each pass through the loop
1756 * previous_tail_pred will point to the last instruction in the
1757 * stream *before* processing the previous operand. Naturally,
1758 * instructions->tail_pred will point to the last instruction in the
1759 * stream *after* processing the previous operand. If the two
1760 * pointers match, then the previous operand had no effect.
1762 * The warning behavior here differs slightly from GCC. GCC will
1763 * only emit a warning if none of the left-hand operands have an
1764 * effect. However, it will emit a warning for each. I believe that
1765 * there are some cases in C (especially with GCC extensions) where
1766 * it is useful to have an intermediate step in a sequence have no
1767 * effect, but I don't think these cases exist in GLSL. Either way,
1768 * it would be a giant hassle to replicate that behavior.
1770 if (previous_tail_pred
== instructions
->tail_pred
) {
1771 _mesa_glsl_warning(&previous_operand_loc
, state
,
1772 "left-hand operand of comma expression has "
1776 /* tail_pred is directly accessed instead of using the get_tail()
1777 * method for performance reasons. get_tail() has extra code to
1778 * return NULL when the list is empty. We don't care about that
1779 * here, so using tail_pred directly is fine.
1781 previous_tail_pred
= instructions
->tail_pred
;
1782 previous_operand_loc
= ast
->get_location();
1784 result
= ast
->hir(instructions
, state
);
1787 /* Any errors should have already been emitted in the loop above.
1789 error_emitted
= true;
1793 type
= NULL
; /* use result->type, not type. */
1794 assert(result
!= NULL
);
1796 if (result
->type
->is_error() && !error_emitted
)
1797 _mesa_glsl_error(& loc
, state
, "type mismatch");
1804 ast_expression_statement::hir(exec_list
*instructions
,
1805 struct _mesa_glsl_parse_state
*state
)
1807 /* It is possible to have expression statements that don't have an
1808 * expression. This is the solitary semicolon:
1810 * for (i = 0; i < 5; i++)
1813 * In this case the expression will be NULL. Test for NULL and don't do
1814 * anything in that case.
1816 if (expression
!= NULL
)
1817 expression
->hir(instructions
, state
);
1819 /* Statements do not have r-values.
1826 ast_compound_statement::hir(exec_list
*instructions
,
1827 struct _mesa_glsl_parse_state
*state
)
1830 state
->symbols
->push_scope();
1832 foreach_list_typed (ast_node
, ast
, link
, &this->statements
)
1833 ast
->hir(instructions
, state
);
1836 state
->symbols
->pop_scope();
1838 /* Compound statements do not have r-values.
1844 static const glsl_type
*
1845 process_array_type(YYLTYPE
*loc
, const glsl_type
*base
, ast_node
*array_size
,
1846 struct _mesa_glsl_parse_state
*state
)
1848 unsigned length
= 0;
1850 /* From page 19 (page 25) of the GLSL 1.20 spec:
1852 * "Only one-dimensional arrays may be declared."
1854 if (base
->is_array()) {
1855 _mesa_glsl_error(loc
, state
,
1856 "invalid array of `%s' (only one-dimensional arrays "
1859 return glsl_type::error_type
;
1862 if (array_size
!= NULL
) {
1863 exec_list dummy_instructions
;
1864 ir_rvalue
*const ir
= array_size
->hir(& dummy_instructions
, state
);
1865 YYLTYPE loc
= array_size
->get_location();
1868 if (!ir
->type
->is_integer()) {
1869 _mesa_glsl_error(& loc
, state
, "array size must be integer type");
1870 } else if (!ir
->type
->is_scalar()) {
1871 _mesa_glsl_error(& loc
, state
, "array size must be scalar type");
1873 ir_constant
*const size
= ir
->constant_expression_value();
1876 _mesa_glsl_error(& loc
, state
, "array size must be a "
1877 "constant valued expression");
1878 } else if (size
->value
.i
[0] <= 0) {
1879 _mesa_glsl_error(& loc
, state
, "array size must be > 0");
1881 assert(size
->type
== ir
->type
);
1882 length
= size
->value
.u
[0];
1884 /* If the array size is const (and we've verified that
1885 * it is) then no instructions should have been emitted
1886 * when we converted it to HIR. If they were emitted,
1887 * then either the array size isn't const after all, or
1888 * we are emitting unnecessary instructions.
1890 assert(dummy_instructions
.is_empty());
1894 } else if (state
->es_shader
) {
1895 /* Section 10.17 of the GLSL ES 1.00 specification states that unsized
1896 * array declarations have been removed from the language.
1898 _mesa_glsl_error(loc
, state
, "unsized array declarations are not "
1899 "allowed in GLSL ES 1.00.");
1902 return glsl_type::get_array_instance(base
, length
);
1907 ast_type_specifier::glsl_type(const char **name
,
1908 struct _mesa_glsl_parse_state
*state
) const
1910 const struct glsl_type
*type
;
1912 type
= state
->symbols
->get_type(this->type_name
);
1913 *name
= this->type_name
;
1915 if (this->is_array
) {
1916 YYLTYPE loc
= this->get_location();
1917 type
= process_array_type(&loc
, type
, this->array_size
, state
);
1925 apply_type_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
1927 struct _mesa_glsl_parse_state
*state
,
1930 if (qual
->flags
.q
.invariant
) {
1932 _mesa_glsl_error(loc
, state
,
1933 "variable `%s' may not be redeclared "
1934 "`invariant' after being used",
1941 if (qual
->flags
.q
.constant
|| qual
->flags
.q
.attribute
1942 || qual
->flags
.q
.uniform
1943 || (qual
->flags
.q
.varying
&& (state
->target
== fragment_shader
)))
1946 if (qual
->flags
.q
.centroid
)
1949 if (qual
->flags
.q
.attribute
&& state
->target
!= vertex_shader
) {
1950 var
->type
= glsl_type::error_type
;
1951 _mesa_glsl_error(loc
, state
,
1952 "`attribute' variables may not be declared in the "
1954 _mesa_glsl_shader_target_name(state
->target
));
1957 /* From page 25 (page 31 of the PDF) of the GLSL 1.10 spec:
1959 * "The varying qualifier can be used only with the data types
1960 * float, vec2, vec3, vec4, mat2, mat3, and mat4, or arrays of
1963 if (qual
->flags
.q
.varying
) {
1964 const glsl_type
*non_array_type
;
1966 if (var
->type
&& var
->type
->is_array())
1967 non_array_type
= var
->type
->fields
.array
;
1969 non_array_type
= var
->type
;
1971 if (non_array_type
&& non_array_type
->base_type
!= GLSL_TYPE_FLOAT
) {
1972 var
->type
= glsl_type::error_type
;
1973 _mesa_glsl_error(loc
, state
,
1974 "varying variables must be of base type float");
1978 /* If there is no qualifier that changes the mode of the variable, leave
1979 * the setting alone.
1981 if (qual
->flags
.q
.in
&& qual
->flags
.q
.out
)
1982 var
->mode
= ir_var_inout
;
1983 else if (qual
->flags
.q
.attribute
|| qual
->flags
.q
.in
1984 || (qual
->flags
.q
.varying
&& (state
->target
== fragment_shader
)))
1985 var
->mode
= ir_var_in
;
1986 else if (qual
->flags
.q
.out
1987 || (qual
->flags
.q
.varying
&& (state
->target
== vertex_shader
)))
1988 var
->mode
= ir_var_out
;
1989 else if (qual
->flags
.q
.uniform
)
1990 var
->mode
= ir_var_uniform
;
1992 if (state
->all_invariant
&& (state
->current_function
== NULL
)) {
1993 switch (state
->target
) {
1995 if (var
->mode
== ir_var_out
)
1996 var
->invariant
= true;
1998 case geometry_shader
:
1999 if ((var
->mode
== ir_var_in
) || (var
->mode
== ir_var_out
))
2000 var
->invariant
= true;
2002 case fragment_shader
:
2003 if (var
->mode
== ir_var_in
)
2004 var
->invariant
= true;
2009 if (qual
->flags
.q
.flat
)
2010 var
->interpolation
= INTERP_QUALIFIER_FLAT
;
2011 else if (qual
->flags
.q
.noperspective
)
2012 var
->interpolation
= INTERP_QUALIFIER_NOPERSPECTIVE
;
2013 else if (qual
->flags
.q
.smooth
)
2014 var
->interpolation
= INTERP_QUALIFIER_SMOOTH
;
2016 var
->interpolation
= INTERP_QUALIFIER_NONE
;
2018 var
->pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
2019 var
->origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
2020 if ((qual
->flags
.q
.origin_upper_left
|| qual
->flags
.q
.pixel_center_integer
)
2021 && (strcmp(var
->name
, "gl_FragCoord") != 0)) {
2022 const char *const qual_string
= (qual
->flags
.q
.origin_upper_left
)
2023 ? "origin_upper_left" : "pixel_center_integer";
2025 _mesa_glsl_error(loc
, state
,
2026 "layout qualifier `%s' can only be applied to "
2027 "fragment shader input `gl_FragCoord'",
2031 if (qual
->flags
.q
.explicit_location
) {
2032 const bool global_scope
= (state
->current_function
== NULL
);
2034 const char *string
= "";
2036 /* In the vertex shader only shader inputs can be given explicit
2039 * In the fragment shader only shader outputs can be given explicit
2042 switch (state
->target
) {
2044 if (!global_scope
|| (var
->mode
!= ir_var_in
)) {
2050 case geometry_shader
:
2051 _mesa_glsl_error(loc
, state
,
2052 "geometry shader variables cannot be given "
2053 "explicit locations\n");
2056 case fragment_shader
:
2057 if (!global_scope
|| (var
->mode
!= ir_var_out
)) {
2065 _mesa_glsl_error(loc
, state
,
2066 "only %s shader %s variables can be given an "
2067 "explicit location\n",
2068 _mesa_glsl_shader_target_name(state
->target
),
2071 var
->explicit_location
= true;
2073 /* This bit of silliness is needed because invalid explicit locations
2074 * are supposed to be flagged during linking. Small negative values
2075 * biased by VERT_ATTRIB_GENERIC0 or FRAG_RESULT_DATA0 could alias
2076 * built-in values (e.g., -16+VERT_ATTRIB_GENERIC0 = VERT_ATTRIB_POS).
2077 * The linker needs to be able to differentiate these cases. This
2078 * ensures that negative values stay negative.
2080 if (qual
->location
>= 0) {
2081 var
->location
= (state
->target
== vertex_shader
)
2082 ? (qual
->location
+ VERT_ATTRIB_GENERIC0
)
2083 : (qual
->location
+ FRAG_RESULT_DATA0
);
2085 var
->location
= qual
->location
;
2090 /* Does the declaration use the 'layout' keyword?
2092 const bool uses_layout
= qual
->flags
.q
.pixel_center_integer
2093 || qual
->flags
.q
.origin_upper_left
2094 || qual
->flags
.q
.explicit_location
;
2096 /* Does the declaration use the deprecated 'attribute' or 'varying'
2099 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
2100 || qual
->flags
.q
.varying
;
2102 /* Is the 'layout' keyword used with parameters that allow relaxed checking.
2103 * Many implementations of GL_ARB_fragment_coord_conventions_enable and some
2104 * implementations (only Mesa?) GL_ARB_explicit_attrib_location_enable
2105 * allowed the layout qualifier to be used with 'varying' and 'attribute'.
2106 * These extensions and all following extensions that add the 'layout'
2107 * keyword have been modified to require the use of 'in' or 'out'.
2109 * The following extension do not allow the deprecated keywords:
2111 * GL_AMD_conservative_depth
2112 * GL_ARB_conservative_depth
2113 * GL_ARB_gpu_shader5
2114 * GL_ARB_separate_shader_objects
2115 * GL_ARB_tesselation_shader
2116 * GL_ARB_transform_feedback3
2117 * GL_ARB_uniform_buffer_object
2119 * It is unknown whether GL_EXT_shader_image_load_store or GL_NV_gpu_shader5
2120 * allow layout with the deprecated keywords.
2122 const bool relaxed_layout_qualifier_checking
=
2123 state
->ARB_fragment_coord_conventions_enable
;
2125 if (uses_layout
&& uses_deprecated_qualifier
) {
2126 if (relaxed_layout_qualifier_checking
) {
2127 _mesa_glsl_warning(loc
, state
,
2128 "`layout' qualifier may not be used with "
2129 "`attribute' or `varying'");
2131 _mesa_glsl_error(loc
, state
,
2132 "`layout' qualifier may not be used with "
2133 "`attribute' or `varying'");
2137 /* Layout qualifiers for gl_FragDepth, which are enabled by extension
2138 * AMD_conservative_depth.
2140 int depth_layout_count
= qual
->flags
.q
.depth_any
2141 + qual
->flags
.q
.depth_greater
2142 + qual
->flags
.q
.depth_less
2143 + qual
->flags
.q
.depth_unchanged
;
2144 if (depth_layout_count
> 0
2145 && !state
->AMD_conservative_depth_enable
2146 && !state
->ARB_conservative_depth_enable
) {
2147 _mesa_glsl_error(loc
, state
,
2148 "extension GL_AMD_conservative_depth or "
2149 "GL_ARB_conservative_depth must be enabled "
2150 "to use depth layout qualifiers");
2151 } else if (depth_layout_count
> 0
2152 && strcmp(var
->name
, "gl_FragDepth") != 0) {
2153 _mesa_glsl_error(loc
, state
,
2154 "depth layout qualifiers can be applied only to "
2156 } else if (depth_layout_count
> 1
2157 && strcmp(var
->name
, "gl_FragDepth") == 0) {
2158 _mesa_glsl_error(loc
, state
,
2159 "at most one depth layout qualifier can be applied to "
2162 if (qual
->flags
.q
.depth_any
)
2163 var
->depth_layout
= ir_depth_layout_any
;
2164 else if (qual
->flags
.q
.depth_greater
)
2165 var
->depth_layout
= ir_depth_layout_greater
;
2166 else if (qual
->flags
.q
.depth_less
)
2167 var
->depth_layout
= ir_depth_layout_less
;
2168 else if (qual
->flags
.q
.depth_unchanged
)
2169 var
->depth_layout
= ir_depth_layout_unchanged
;
2171 var
->depth_layout
= ir_depth_layout_none
;
2175 * Get the variable that is being redeclared by this declaration
2177 * Semantic checks to verify the validity of the redeclaration are also
2178 * performed. If semantic checks fail, compilation error will be emitted via
2179 * \c _mesa_glsl_error, but a non-\c NULL pointer will still be returned.
2182 * A pointer to an existing variable in the current scope if the declaration
2183 * is a redeclaration, \c NULL otherwise.
2186 get_variable_being_redeclared(ir_variable
*var
, ast_declaration
*decl
,
2187 struct _mesa_glsl_parse_state
*state
)
2189 /* Check if this declaration is actually a re-declaration, either to
2190 * resize an array or add qualifiers to an existing variable.
2192 * This is allowed for variables in the current scope, or when at
2193 * global scope (for built-ins in the implicit outer scope).
2195 ir_variable
*earlier
= state
->symbols
->get_variable(decl
->identifier
);
2196 if (earlier
== NULL
||
2197 (state
->current_function
!= NULL
&&
2198 !state
->symbols
->name_declared_this_scope(decl
->identifier
))) {
2203 YYLTYPE loc
= decl
->get_location();
2205 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec,
2207 * "It is legal to declare an array without a size and then
2208 * later re-declare the same name as an array of the same
2209 * type and specify a size."
2211 if ((earlier
->type
->array_size() == 0)
2212 && var
->type
->is_array()
2213 && (var
->type
->element_type() == earlier
->type
->element_type())) {
2214 /* FINISHME: This doesn't match the qualifiers on the two
2215 * FINISHME: declarations. It's not 100% clear whether this is
2216 * FINISHME: required or not.
2219 const unsigned size
= unsigned(var
->type
->array_size());
2220 check_builtin_array_max_size(var
->name
, size
, loc
, state
);
2221 if ((size
> 0) && (size
<= earlier
->max_array_access
)) {
2222 _mesa_glsl_error(& loc
, state
, "array size must be > %u due to "
2224 earlier
->max_array_access
);
2227 earlier
->type
= var
->type
;
2230 } else if (state
->ARB_fragment_coord_conventions_enable
2231 && strcmp(var
->name
, "gl_FragCoord") == 0
2232 && earlier
->type
== var
->type
2233 && earlier
->mode
== var
->mode
) {
2234 /* Allow redeclaration of gl_FragCoord for ARB_fcc layout
2237 earlier
->origin_upper_left
= var
->origin_upper_left
;
2238 earlier
->pixel_center_integer
= var
->pixel_center_integer
;
2240 /* According to section 4.3.7 of the GLSL 1.30 spec,
2241 * the following built-in varaibles can be redeclared with an
2242 * interpolation qualifier:
2245 * * gl_FrontSecondaryColor
2246 * * gl_BackSecondaryColor
2248 * * gl_SecondaryColor
2250 } else if (state
->language_version
>= 130
2251 && (strcmp(var
->name
, "gl_FrontColor") == 0
2252 || strcmp(var
->name
, "gl_BackColor") == 0
2253 || strcmp(var
->name
, "gl_FrontSecondaryColor") == 0
2254 || strcmp(var
->name
, "gl_BackSecondaryColor") == 0
2255 || strcmp(var
->name
, "gl_Color") == 0
2256 || strcmp(var
->name
, "gl_SecondaryColor") == 0)
2257 && earlier
->type
== var
->type
2258 && earlier
->mode
== var
->mode
) {
2259 earlier
->interpolation
= var
->interpolation
;
2261 /* Layout qualifiers for gl_FragDepth. */
2262 } else if ((state
->AMD_conservative_depth_enable
||
2263 state
->ARB_conservative_depth_enable
)
2264 && strcmp(var
->name
, "gl_FragDepth") == 0
2265 && earlier
->type
== var
->type
2266 && earlier
->mode
== var
->mode
) {
2268 /** From the AMD_conservative_depth spec:
2269 * Within any shader, the first redeclarations of gl_FragDepth
2270 * must appear before any use of gl_FragDepth.
2272 if (earlier
->used
) {
2273 _mesa_glsl_error(&loc
, state
,
2274 "the first redeclaration of gl_FragDepth "
2275 "must appear before any use of gl_FragDepth");
2278 /* Prevent inconsistent redeclaration of depth layout qualifier. */
2279 if (earlier
->depth_layout
!= ir_depth_layout_none
2280 && earlier
->depth_layout
!= var
->depth_layout
) {
2281 _mesa_glsl_error(&loc
, state
,
2282 "gl_FragDepth: depth layout is declared here "
2283 "as '%s, but it was previously declared as "
2285 depth_layout_string(var
->depth_layout
),
2286 depth_layout_string(earlier
->depth_layout
));
2289 earlier
->depth_layout
= var
->depth_layout
;
2292 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", decl
->identifier
);
2299 * Generate the IR for an initializer in a variable declaration
2302 process_initializer(ir_variable
*var
, ast_declaration
*decl
,
2303 ast_fully_specified_type
*type
,
2304 exec_list
*initializer_instructions
,
2305 struct _mesa_glsl_parse_state
*state
)
2307 ir_rvalue
*result
= NULL
;
2309 YYLTYPE initializer_loc
= decl
->initializer
->get_location();
2311 /* From page 24 (page 30 of the PDF) of the GLSL 1.10 spec:
2313 * "All uniform variables are read-only and are initialized either
2314 * directly by an application via API commands, or indirectly by
2317 if ((state
->language_version
<= 110)
2318 && (var
->mode
== ir_var_uniform
)) {
2319 _mesa_glsl_error(& initializer_loc
, state
,
2320 "cannot initialize uniforms in GLSL 1.10");
2323 if (var
->type
->is_sampler()) {
2324 _mesa_glsl_error(& initializer_loc
, state
,
2325 "cannot initialize samplers");
2328 if ((var
->mode
== ir_var_in
) && (state
->current_function
== NULL
)) {
2329 _mesa_glsl_error(& initializer_loc
, state
,
2330 "cannot initialize %s shader input / %s",
2331 _mesa_glsl_shader_target_name(state
->target
),
2332 (state
->target
== vertex_shader
)
2333 ? "attribute" : "varying");
2336 ir_dereference
*const lhs
= new(state
) ir_dereference_variable(var
);
2337 ir_rvalue
*rhs
= decl
->initializer
->hir(initializer_instructions
,
2340 /* Calculate the constant value if this is a const or uniform
2343 if (type
->qualifier
.flags
.q
.constant
2344 || type
->qualifier
.flags
.q
.uniform
) {
2345 ir_rvalue
*new_rhs
= validate_assignment(state
, var
->type
, rhs
, true);
2346 if (new_rhs
!= NULL
) {
2349 ir_constant
*constant_value
= rhs
->constant_expression_value();
2350 if (!constant_value
) {
2351 _mesa_glsl_error(& initializer_loc
, state
,
2352 "initializer of %s variable `%s' must be a "
2353 "constant expression",
2354 (type
->qualifier
.flags
.q
.constant
)
2355 ? "const" : "uniform",
2357 if (var
->type
->is_numeric()) {
2358 /* Reduce cascading errors. */
2359 var
->constant_value
= ir_constant::zero(state
, var
->type
);
2362 rhs
= constant_value
;
2363 var
->constant_value
= constant_value
;
2366 _mesa_glsl_error(&initializer_loc
, state
,
2367 "initializer of type %s cannot be assigned to "
2368 "variable of type %s",
2369 rhs
->type
->name
, var
->type
->name
);
2370 if (var
->type
->is_numeric()) {
2371 /* Reduce cascading errors. */
2372 var
->constant_value
= ir_constant::zero(state
, var
->type
);
2377 if (rhs
&& !rhs
->type
->is_error()) {
2378 bool temp
= var
->read_only
;
2379 if (type
->qualifier
.flags
.q
.constant
)
2380 var
->read_only
= false;
2382 /* Never emit code to initialize a uniform.
2384 const glsl_type
*initializer_type
;
2385 if (!type
->qualifier
.flags
.q
.uniform
) {
2386 result
= do_assignment(initializer_instructions
, state
,
2389 type
->get_location());
2390 initializer_type
= result
->type
;
2392 initializer_type
= rhs
->type
;
2394 var
->constant_initializer
= rhs
->constant_expression_value();
2395 var
->has_initializer
= true;
2397 /* If the declared variable is an unsized array, it must inherrit
2398 * its full type from the initializer. A declaration such as
2400 * uniform float a[] = float[](1.0, 2.0, 3.0, 3.0);
2404 * uniform float a[4] = float[](1.0, 2.0, 3.0, 3.0);
2406 * The assignment generated in the if-statement (below) will also
2407 * automatically handle this case for non-uniforms.
2409 * If the declared variable is not an array, the types must
2410 * already match exactly. As a result, the type assignment
2411 * here can be done unconditionally. For non-uniforms the call
2412 * to do_assignment can change the type of the initializer (via
2413 * the implicit conversion rules). For uniforms the initializer
2414 * must be a constant expression, and the type of that expression
2415 * was validated above.
2417 var
->type
= initializer_type
;
2419 var
->read_only
= temp
;
2426 ast_declarator_list::hir(exec_list
*instructions
,
2427 struct _mesa_glsl_parse_state
*state
)
2430 const struct glsl_type
*decl_type
;
2431 const char *type_name
= NULL
;
2432 ir_rvalue
*result
= NULL
;
2433 YYLTYPE loc
= this->get_location();
2435 /* From page 46 (page 52 of the PDF) of the GLSL 1.50 spec:
2437 * "To ensure that a particular output variable is invariant, it is
2438 * necessary to use the invariant qualifier. It can either be used to
2439 * qualify a previously declared variable as being invariant
2441 * invariant gl_Position; // make existing gl_Position be invariant"
2443 * In these cases the parser will set the 'invariant' flag in the declarator
2444 * list, and the type will be NULL.
2446 if (this->invariant
) {
2447 assert(this->type
== NULL
);
2449 if (state
->current_function
!= NULL
) {
2450 _mesa_glsl_error(& loc
, state
,
2451 "All uses of `invariant' keyword must be at global "
2455 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
2456 assert(!decl
->is_array
);
2457 assert(decl
->array_size
== NULL
);
2458 assert(decl
->initializer
== NULL
);
2460 ir_variable
*const earlier
=
2461 state
->symbols
->get_variable(decl
->identifier
);
2462 if (earlier
== NULL
) {
2463 _mesa_glsl_error(& loc
, state
,
2464 "Undeclared variable `%s' cannot be marked "
2465 "invariant\n", decl
->identifier
);
2466 } else if ((state
->target
== vertex_shader
)
2467 && (earlier
->mode
!= ir_var_out
)) {
2468 _mesa_glsl_error(& loc
, state
,
2469 "`%s' cannot be marked invariant, vertex shader "
2470 "outputs only\n", decl
->identifier
);
2471 } else if ((state
->target
== fragment_shader
)
2472 && (earlier
->mode
!= ir_var_in
)) {
2473 _mesa_glsl_error(& loc
, state
,
2474 "`%s' cannot be marked invariant, fragment shader "
2475 "inputs only\n", decl
->identifier
);
2476 } else if (earlier
->used
) {
2477 _mesa_glsl_error(& loc
, state
,
2478 "variable `%s' may not be redeclared "
2479 "`invariant' after being used",
2482 earlier
->invariant
= true;
2486 /* Invariant redeclarations do not have r-values.
2491 assert(this->type
!= NULL
);
2492 assert(!this->invariant
);
2494 /* The type specifier may contain a structure definition. Process that
2495 * before any of the variable declarations.
2497 (void) this->type
->specifier
->hir(instructions
, state
);
2499 decl_type
= this->type
->specifier
->glsl_type(& type_name
, state
);
2500 if (this->declarations
.is_empty()) {
2501 /* If there is no structure involved in the program text, there are two
2502 * possible scenarios:
2504 * - The program text contained something like 'vec4;'. This is an
2505 * empty declaration. It is valid but weird. Emit a warning.
2507 * - The program text contained something like 'S;' and 'S' is not the
2508 * name of a known structure type. This is both invalid and weird.
2511 * Note that if decl_type is NULL and there is a structure involved,
2512 * there must have been some sort of error with the structure. In this
2513 * case we assume that an error was already generated on this line of
2514 * code for the structure. There is no need to generate an additional,
2517 assert(this->type
->specifier
->structure
== NULL
|| decl_type
!= NULL
2519 if (this->type
->specifier
->structure
== NULL
) {
2520 if (decl_type
!= NULL
) {
2521 _mesa_glsl_warning(&loc
, state
, "empty declaration");
2523 _mesa_glsl_error(&loc
, state
,
2524 "invalid type `%s' in empty declaration",
2530 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
2531 const struct glsl_type
*var_type
;
2534 /* FINISHME: Emit a warning if a variable declaration shadows a
2535 * FINISHME: declaration at a higher scope.
2538 if ((decl_type
== NULL
) || decl_type
->is_void()) {
2539 if (type_name
!= NULL
) {
2540 _mesa_glsl_error(& loc
, state
,
2541 "invalid type `%s' in declaration of `%s'",
2542 type_name
, decl
->identifier
);
2544 _mesa_glsl_error(& loc
, state
,
2545 "invalid type in declaration of `%s'",
2551 if (decl
->is_array
) {
2552 var_type
= process_array_type(&loc
, decl_type
, decl
->array_size
,
2554 if (var_type
->is_error())
2557 var_type
= decl_type
;
2560 var
= new(ctx
) ir_variable(var_type
, decl
->identifier
, ir_var_auto
);
2562 /* From page 22 (page 28 of the PDF) of the GLSL 1.10 specification;
2564 * "Global variables can only use the qualifiers const,
2565 * attribute, uni form, or varying. Only one may be
2568 * Local variables can only use the qualifier const."
2570 * This is relaxed in GLSL 1.30. It is also relaxed by any extension
2571 * that adds the 'layout' keyword.
2573 if ((state
->language_version
< 130)
2574 && !state
->ARB_explicit_attrib_location_enable
2575 && !state
->ARB_fragment_coord_conventions_enable
) {
2576 if (this->type
->qualifier
.flags
.q
.out
) {
2577 _mesa_glsl_error(& loc
, state
,
2578 "`out' qualifier in declaration of `%s' "
2579 "only valid for function parameters in %s.",
2580 decl
->identifier
, state
->version_string
);
2582 if (this->type
->qualifier
.flags
.q
.in
) {
2583 _mesa_glsl_error(& loc
, state
,
2584 "`in' qualifier in declaration of `%s' "
2585 "only valid for function parameters in %s.",
2586 decl
->identifier
, state
->version_string
);
2588 /* FINISHME: Test for other invalid qualifiers. */
2591 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
,
2594 if (this->type
->qualifier
.flags
.q
.invariant
) {
2595 if ((state
->target
== vertex_shader
) && !(var
->mode
== ir_var_out
||
2596 var
->mode
== ir_var_inout
)) {
2597 /* FINISHME: Note that this doesn't work for invariant on
2598 * a function signature outval
2600 _mesa_glsl_error(& loc
, state
,
2601 "`%s' cannot be marked invariant, vertex shader "
2602 "outputs only\n", var
->name
);
2603 } else if ((state
->target
== fragment_shader
) &&
2604 !(var
->mode
== ir_var_in
|| var
->mode
== ir_var_inout
)) {
2605 /* FINISHME: Note that this doesn't work for invariant on
2606 * a function signature inval
2608 _mesa_glsl_error(& loc
, state
,
2609 "`%s' cannot be marked invariant, fragment shader "
2610 "inputs only\n", var
->name
);
2614 if (state
->current_function
!= NULL
) {
2615 const char *mode
= NULL
;
2616 const char *extra
= "";
2618 /* There is no need to check for 'inout' here because the parser will
2619 * only allow that in function parameter lists.
2621 if (this->type
->qualifier
.flags
.q
.attribute
) {
2623 } else if (this->type
->qualifier
.flags
.q
.uniform
) {
2625 } else if (this->type
->qualifier
.flags
.q
.varying
) {
2627 } else if (this->type
->qualifier
.flags
.q
.in
) {
2629 extra
= " or in function parameter list";
2630 } else if (this->type
->qualifier
.flags
.q
.out
) {
2632 extra
= " or in function parameter list";
2636 _mesa_glsl_error(& loc
, state
,
2637 "%s variable `%s' must be declared at "
2639 mode
, var
->name
, extra
);
2641 } else if (var
->mode
== ir_var_in
) {
2642 var
->read_only
= true;
2644 if (state
->target
== vertex_shader
) {
2645 bool error_emitted
= false;
2647 /* From page 31 (page 37 of the PDF) of the GLSL 1.50 spec:
2649 * "Vertex shader inputs can only be float, floating-point
2650 * vectors, matrices, signed and unsigned integers and integer
2651 * vectors. Vertex shader inputs can also form arrays of these
2652 * types, but not structures."
2654 * From page 31 (page 27 of the PDF) of the GLSL 1.30 spec:
2656 * "Vertex shader inputs can only be float, floating-point
2657 * vectors, matrices, signed and unsigned integers and integer
2658 * vectors. They cannot be arrays or structures."
2660 * From page 23 (page 29 of the PDF) of the GLSL 1.20 spec:
2662 * "The attribute qualifier can be used only with float,
2663 * floating-point vectors, and matrices. Attribute variables
2664 * cannot be declared as arrays or structures."
2666 const glsl_type
*check_type
= var
->type
->is_array()
2667 ? var
->type
->fields
.array
: var
->type
;
2669 switch (check_type
->base_type
) {
2670 case GLSL_TYPE_FLOAT
:
2672 case GLSL_TYPE_UINT
:
2674 if (state
->language_version
> 120)
2678 _mesa_glsl_error(& loc
, state
,
2679 "vertex shader input / attribute cannot have "
2681 var
->type
->is_array() ? "array of " : "",
2683 error_emitted
= true;
2686 if (!error_emitted
&& (state
->language_version
<= 130)
2687 && var
->type
->is_array()) {
2688 _mesa_glsl_error(& loc
, state
,
2689 "vertex shader input / attribute cannot have "
2691 error_emitted
= true;
2696 /* Integer vertex outputs must be qualified with 'flat'.
2698 * From section 4.3.6 of the GLSL 1.30 spec:
2699 * "If a vertex output is a signed or unsigned integer or integer
2700 * vector, then it must be qualified with the interpolation qualifier
2703 if (state
->language_version
>= 130
2704 && state
->target
== vertex_shader
2705 && state
->current_function
== NULL
2706 && var
->type
->is_integer()
2707 && var
->mode
== ir_var_out
2708 && var
->interpolation
!= INTERP_QUALIFIER_FLAT
) {
2710 _mesa_glsl_error(&loc
, state
, "If a vertex output is an integer, "
2711 "then it must be qualified with 'flat'");
2715 /* Interpolation qualifiers cannot be applied to 'centroid' and
2716 * 'centroid varying'.
2718 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
2719 * "interpolation qualifiers may only precede the qualifiers in,
2720 * centroid in, out, or centroid out in a declaration. They do not apply
2721 * to the deprecated storage qualifiers varying or centroid varying."
2723 if (state
->language_version
>= 130
2724 && this->type
->qualifier
.has_interpolation()
2725 && this->type
->qualifier
.flags
.q
.varying
) {
2727 const char *i
= this->type
->qualifier
.interpolation_string();
2730 if (this->type
->qualifier
.flags
.q
.centroid
)
2731 s
= "centroid varying";
2735 _mesa_glsl_error(&loc
, state
,
2736 "qualifier '%s' cannot be applied to the "
2737 "deprecated storage qualifier '%s'", i
, s
);
2741 /* Interpolation qualifiers can only apply to vertex shader outputs and
2742 * fragment shader inputs.
2744 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
2745 * "Outputs from a vertex shader (out) and inputs to a fragment
2746 * shader (in) can be further qualified with one or more of these
2747 * interpolation qualifiers"
2749 if (state
->language_version
>= 130
2750 && this->type
->qualifier
.has_interpolation()) {
2752 const char *i
= this->type
->qualifier
.interpolation_string();
2755 switch (state
->target
) {
2757 if (this->type
->qualifier
.flags
.q
.in
) {
2758 _mesa_glsl_error(&loc
, state
,
2759 "qualifier '%s' cannot be applied to vertex "
2760 "shader inputs", i
);
2763 case fragment_shader
:
2764 if (this->type
->qualifier
.flags
.q
.out
) {
2765 _mesa_glsl_error(&loc
, state
,
2766 "qualifier '%s' cannot be applied to fragment "
2767 "shader outputs", i
);
2776 /* From section 4.3.4 of the GLSL 1.30 spec:
2777 * "It is an error to use centroid in in a vertex shader."
2779 if (state
->language_version
>= 130
2780 && this->type
->qualifier
.flags
.q
.centroid
2781 && this->type
->qualifier
.flags
.q
.in
2782 && state
->target
== vertex_shader
) {
2784 _mesa_glsl_error(&loc
, state
,
2785 "'centroid in' cannot be used in a vertex shader");
2789 /* Precision qualifiers exists only in GLSL versions 1.00 and >= 1.30.
2791 if (this->type
->specifier
->precision
!= ast_precision_none
2792 && state
->language_version
!= 100
2793 && state
->language_version
< 130) {
2795 _mesa_glsl_error(&loc
, state
,
2796 "precision qualifiers are supported only in GLSL ES "
2797 "1.00, and GLSL 1.30 and later");
2801 /* Precision qualifiers only apply to floating point and integer types.
2803 * From section 4.5.2 of the GLSL 1.30 spec:
2804 * "Any floating point or any integer declaration can have the type
2805 * preceded by one of these precision qualifiers [...] Literal
2806 * constants do not have precision qualifiers. Neither do Boolean
2809 * In GLSL ES, sampler types are also allowed.
2811 * From page 87 of the GLSL ES spec:
2812 * "RESOLUTION: Allow sampler types to take a precision qualifier."
2814 if (this->type
->specifier
->precision
!= ast_precision_none
2815 && !var
->type
->is_float()
2816 && !var
->type
->is_integer()
2817 && !(var
->type
->is_sampler() && state
->es_shader
)
2818 && !(var
->type
->is_array()
2819 && (var
->type
->fields
.array
->is_float()
2820 || var
->type
->fields
.array
->is_integer()))) {
2822 _mesa_glsl_error(&loc
, state
,
2823 "precision qualifiers apply only to floating point"
2824 "%s types", state
->es_shader
? ", integer, and sampler"
2828 /* From page 17 (page 23 of the PDF) of the GLSL 1.20 spec:
2830 * "[Sampler types] can only be declared as function
2831 * parameters or uniform variables (see Section 4.3.5
2834 if (var_type
->contains_sampler() &&
2835 !this->type
->qualifier
.flags
.q
.uniform
) {
2836 _mesa_glsl_error(&loc
, state
, "samplers must be declared uniform");
2839 /* Process the initializer and add its instructions to a temporary
2840 * list. This list will be added to the instruction stream (below) after
2841 * the declaration is added. This is done because in some cases (such as
2842 * redeclarations) the declaration may not actually be added to the
2843 * instruction stream.
2845 exec_list initializer_instructions
;
2846 ir_variable
*earlier
= get_variable_being_redeclared(var
, decl
, state
);
2848 if (decl
->initializer
!= NULL
) {
2849 result
= process_initializer((earlier
== NULL
) ? var
: earlier
,
2851 &initializer_instructions
, state
);
2854 /* From page 23 (page 29 of the PDF) of the GLSL 1.10 spec:
2856 * "It is an error to write to a const variable outside of
2857 * its declaration, so they must be initialized when
2860 if (this->type
->qualifier
.flags
.q
.constant
&& decl
->initializer
== NULL
) {
2861 _mesa_glsl_error(& loc
, state
,
2862 "const declaration of `%s' must be initialized",
2866 /* If the declaration is not a redeclaration, there are a few additional
2867 * semantic checks that must be applied. In addition, variable that was
2868 * created for the declaration should be added to the IR stream.
2870 if (earlier
== NULL
) {
2871 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
2873 * "Identifiers starting with "gl_" are reserved for use by
2874 * OpenGL, and may not be declared in a shader as either a
2875 * variable or a function."
2877 if (strncmp(decl
->identifier
, "gl_", 3) == 0)
2878 _mesa_glsl_error(& loc
, state
,
2879 "identifier `%s' uses reserved `gl_' prefix",
2881 else if (strstr(decl
->identifier
, "__")) {
2882 /* From page 14 (page 20 of the PDF) of the GLSL 1.10
2885 * "In addition, all identifiers containing two
2886 * consecutive underscores (__) are reserved as
2887 * possible future keywords."
2889 _mesa_glsl_error(& loc
, state
,
2890 "identifier `%s' uses reserved `__' string",
2894 /* Add the variable to the symbol table. Note that the initializer's
2895 * IR was already processed earlier (though it hasn't been emitted
2896 * yet), without the variable in scope.
2898 * This differs from most C-like languages, but it follows the GLSL
2899 * specification. From page 28 (page 34 of the PDF) of the GLSL 1.50
2902 * "Within a declaration, the scope of a name starts immediately
2903 * after the initializer if present or immediately after the name
2904 * being declared if not."
2906 if (!state
->symbols
->add_variable(var
)) {
2907 YYLTYPE loc
= this->get_location();
2908 _mesa_glsl_error(&loc
, state
, "name `%s' already taken in the "
2909 "current scope", decl
->identifier
);
2913 /* Push the variable declaration to the top. It means that all the
2914 * variable declarations will appear in a funny last-to-first order,
2915 * but otherwise we run into trouble if a function is prototyped, a
2916 * global var is decled, then the function is defined with usage of
2917 * the global var. See glslparsertest's CorrectModule.frag.
2919 instructions
->push_head(var
);
2922 instructions
->append_list(&initializer_instructions
);
2926 /* Generally, variable declarations do not have r-values. However,
2927 * one is used for the declaration in
2929 * while (bool b = some_condition()) {
2933 * so we return the rvalue from the last seen declaration here.
2940 ast_parameter_declarator::hir(exec_list
*instructions
,
2941 struct _mesa_glsl_parse_state
*state
)
2944 const struct glsl_type
*type
;
2945 const char *name
= NULL
;
2946 YYLTYPE loc
= this->get_location();
2948 type
= this->type
->specifier
->glsl_type(& name
, state
);
2952 _mesa_glsl_error(& loc
, state
,
2953 "invalid type `%s' in declaration of `%s'",
2954 name
, this->identifier
);
2956 _mesa_glsl_error(& loc
, state
,
2957 "invalid type in declaration of `%s'",
2961 type
= glsl_type::error_type
;
2964 /* From page 62 (page 68 of the PDF) of the GLSL 1.50 spec:
2966 * "Functions that accept no input arguments need not use void in the
2967 * argument list because prototypes (or definitions) are required and
2968 * therefore there is no ambiguity when an empty argument list "( )" is
2969 * declared. The idiom "(void)" as a parameter list is provided for
2972 * Placing this check here prevents a void parameter being set up
2973 * for a function, which avoids tripping up checks for main taking
2974 * parameters and lookups of an unnamed symbol.
2976 if (type
->is_void()) {
2977 if (this->identifier
!= NULL
)
2978 _mesa_glsl_error(& loc
, state
,
2979 "named parameter cannot have type `void'");
2985 if (formal_parameter
&& (this->identifier
== NULL
)) {
2986 _mesa_glsl_error(& loc
, state
, "formal parameter lacks a name");
2990 /* This only handles "vec4 foo[..]". The earlier specifier->glsl_type(...)
2991 * call already handled the "vec4[..] foo" case.
2993 if (this->is_array
) {
2994 type
= process_array_type(&loc
, type
, this->array_size
, state
);
2997 if (!type
->is_error() && type
->array_size() == 0) {
2998 _mesa_glsl_error(&loc
, state
, "arrays passed as parameters must have "
2999 "a declared size.");
3000 type
= glsl_type::error_type
;
3004 ir_variable
*var
= new(ctx
) ir_variable(type
, this->identifier
, ir_var_in
);
3006 /* Apply any specified qualifiers to the parameter declaration. Note that
3007 * for function parameters the default mode is 'in'.
3009 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
, & loc
);
3011 /* From page 17 (page 23 of the PDF) of the GLSL 1.20 spec:
3013 * "Samplers cannot be treated as l-values; hence cannot be used
3014 * as out or inout function parameters, nor can they be assigned
3017 if ((var
->mode
== ir_var_inout
|| var
->mode
== ir_var_out
)
3018 && type
->contains_sampler()) {
3019 _mesa_glsl_error(&loc
, state
, "out and inout parameters cannot contain samplers");
3020 type
= glsl_type::error_type
;
3023 /* From page 39 (page 45 of the PDF) of the GLSL 1.10 spec:
3025 * "When calling a function, expressions that do not evaluate to
3026 * l-values cannot be passed to parameters declared as out or inout."
3028 * From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
3030 * "Other binary or unary expressions, non-dereferenced arrays,
3031 * function names, swizzles with repeated fields, and constants
3032 * cannot be l-values."
3034 * So for GLSL 1.10, passing an array as an out or inout parameter is not
3035 * allowed. This restriction is removed in GLSL 1.20, and in GLSL ES.
3037 if ((var
->mode
== ir_var_inout
|| var
->mode
== ir_var_out
)
3038 && type
->is_array() && state
->language_version
== 110) {
3039 _mesa_glsl_error(&loc
, state
, "Arrays cannot be out or inout parameters in GLSL 1.10");
3040 type
= glsl_type::error_type
;
3043 instructions
->push_tail(var
);
3045 /* Parameter declarations do not have r-values.
3052 ast_parameter_declarator::parameters_to_hir(exec_list
*ast_parameters
,
3054 exec_list
*ir_parameters
,
3055 _mesa_glsl_parse_state
*state
)
3057 ast_parameter_declarator
*void_param
= NULL
;
3060 foreach_list_typed (ast_parameter_declarator
, param
, link
, ast_parameters
) {
3061 param
->formal_parameter
= formal
;
3062 param
->hir(ir_parameters
, state
);
3070 if ((void_param
!= NULL
) && (count
> 1)) {
3071 YYLTYPE loc
= void_param
->get_location();
3073 _mesa_glsl_error(& loc
, state
,
3074 "`void' parameter must be only parameter");
3080 emit_function(_mesa_glsl_parse_state
*state
, ir_function
*f
)
3082 /* IR invariants disallow function declarations or definitions
3083 * nested within other function definitions. But there is no
3084 * requirement about the relative order of function declarations
3085 * and definitions with respect to one another. So simply insert
3086 * the new ir_function block at the end of the toplevel instruction
3089 state
->toplevel_ir
->push_tail(f
);
3094 ast_function::hir(exec_list
*instructions
,
3095 struct _mesa_glsl_parse_state
*state
)
3098 ir_function
*f
= NULL
;
3099 ir_function_signature
*sig
= NULL
;
3100 exec_list hir_parameters
;
3102 const char *const name
= identifier
;
3104 /* New functions are always added to the top-level IR instruction stream,
3105 * so this instruction list pointer is ignored. See also emit_function
3108 (void) instructions
;
3110 /* From page 21 (page 27 of the PDF) of the GLSL 1.20 spec,
3112 * "Function declarations (prototypes) cannot occur inside of functions;
3113 * they must be at global scope, or for the built-in functions, outside
3114 * the global scope."
3116 * From page 27 (page 33 of the PDF) of the GLSL ES 1.00.16 spec,
3118 * "User defined functions may only be defined within the global scope."
3120 * Note that this language does not appear in GLSL 1.10.
3122 if ((state
->current_function
!= NULL
) && (state
->language_version
!= 110)) {
3123 YYLTYPE loc
= this->get_location();
3124 _mesa_glsl_error(&loc
, state
,
3125 "declaration of function `%s' not allowed within "
3126 "function body", name
);
3129 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
3131 * "Identifiers starting with "gl_" are reserved for use by
3132 * OpenGL, and may not be declared in a shader as either a
3133 * variable or a function."
3135 if (strncmp(name
, "gl_", 3) == 0) {
3136 YYLTYPE loc
= this->get_location();
3137 _mesa_glsl_error(&loc
, state
,
3138 "identifier `%s' uses reserved `gl_' prefix", name
);
3141 /* Convert the list of function parameters to HIR now so that they can be
3142 * used below to compare this function's signature with previously seen
3143 * signatures for functions with the same name.
3145 ast_parameter_declarator::parameters_to_hir(& this->parameters
,
3147 & hir_parameters
, state
);
3149 const char *return_type_name
;
3150 const glsl_type
*return_type
=
3151 this->return_type
->specifier
->glsl_type(& return_type_name
, state
);
3154 YYLTYPE loc
= this->get_location();
3155 _mesa_glsl_error(&loc
, state
,
3156 "function `%s' has undeclared return type `%s'",
3157 name
, return_type_name
);
3158 return_type
= glsl_type::error_type
;
3161 /* From page 56 (page 62 of the PDF) of the GLSL 1.30 spec:
3162 * "No qualifier is allowed on the return type of a function."
3164 if (this->return_type
->has_qualifiers()) {
3165 YYLTYPE loc
= this->get_location();
3166 _mesa_glsl_error(& loc
, state
,
3167 "function `%s' return type has qualifiers", name
);
3170 /* From page 17 (page 23 of the PDF) of the GLSL 1.20 spec:
3172 * "[Sampler types] can only be declared as function parameters
3173 * or uniform variables (see Section 4.3.5 "Uniform")".
3175 if (return_type
->contains_sampler()) {
3176 YYLTYPE loc
= this->get_location();
3177 _mesa_glsl_error(&loc
, state
,
3178 "function `%s' return type can't contain a sampler",
3182 /* Verify that this function's signature either doesn't match a previously
3183 * seen signature for a function with the same name, or, if a match is found,
3184 * that the previously seen signature does not have an associated definition.
3186 f
= state
->symbols
->get_function(name
);
3187 if (f
!= NULL
&& (state
->es_shader
|| f
->has_user_signature())) {
3188 sig
= f
->exact_matching_signature(&hir_parameters
);
3190 const char *badvar
= sig
->qualifiers_match(&hir_parameters
);
3191 if (badvar
!= NULL
) {
3192 YYLTYPE loc
= this->get_location();
3194 _mesa_glsl_error(&loc
, state
, "function `%s' parameter `%s' "
3195 "qualifiers don't match prototype", name
, badvar
);
3198 if (sig
->return_type
!= return_type
) {
3199 YYLTYPE loc
= this->get_location();
3201 _mesa_glsl_error(&loc
, state
, "function `%s' return type doesn't "
3202 "match prototype", name
);
3205 if (is_definition
&& sig
->is_defined
) {
3206 YYLTYPE loc
= this->get_location();
3208 _mesa_glsl_error(& loc
, state
, "function `%s' redefined", name
);
3212 f
= new(ctx
) ir_function(name
);
3213 if (!state
->symbols
->add_function(f
)) {
3214 /* This function name shadows a non-function use of the same name. */
3215 YYLTYPE loc
= this->get_location();
3217 _mesa_glsl_error(&loc
, state
, "function name `%s' conflicts with "
3218 "non-function", name
);
3222 emit_function(state
, f
);
3225 /* Verify the return type of main() */
3226 if (strcmp(name
, "main") == 0) {
3227 if (! return_type
->is_void()) {
3228 YYLTYPE loc
= this->get_location();
3230 _mesa_glsl_error(& loc
, state
, "main() must return void");
3233 if (!hir_parameters
.is_empty()) {
3234 YYLTYPE loc
= this->get_location();
3236 _mesa_glsl_error(& loc
, state
, "main() must not take any parameters");
3240 /* Finish storing the information about this new function in its signature.
3243 sig
= new(ctx
) ir_function_signature(return_type
);
3244 f
->add_signature(sig
);
3247 sig
->replace_parameters(&hir_parameters
);
3250 /* Function declarations (prototypes) do not have r-values.
3257 ast_function_definition::hir(exec_list
*instructions
,
3258 struct _mesa_glsl_parse_state
*state
)
3260 prototype
->is_definition
= true;
3261 prototype
->hir(instructions
, state
);
3263 ir_function_signature
*signature
= prototype
->signature
;
3264 if (signature
== NULL
)
3267 assert(state
->current_function
== NULL
);
3268 state
->current_function
= signature
;
3269 state
->found_return
= false;
3271 /* Duplicate parameters declared in the prototype as concrete variables.
3272 * Add these to the symbol table.
3274 state
->symbols
->push_scope();
3275 foreach_iter(exec_list_iterator
, iter
, signature
->parameters
) {
3276 ir_variable
*const var
= ((ir_instruction
*) iter
.get())->as_variable();
3278 assert(var
!= NULL
);
3280 /* The only way a parameter would "exist" is if two parameters have
3283 if (state
->symbols
->name_declared_this_scope(var
->name
)) {
3284 YYLTYPE loc
= this->get_location();
3286 _mesa_glsl_error(& loc
, state
, "parameter `%s' redeclared", var
->name
);
3288 state
->symbols
->add_variable(var
);
3292 /* Convert the body of the function to HIR. */
3293 this->body
->hir(&signature
->body
, state
);
3294 signature
->is_defined
= true;
3296 state
->symbols
->pop_scope();
3298 assert(state
->current_function
== signature
);
3299 state
->current_function
= NULL
;
3301 if (!signature
->return_type
->is_void() && !state
->found_return
) {
3302 YYLTYPE loc
= this->get_location();
3303 _mesa_glsl_error(& loc
, state
, "function `%s' has non-void return type "
3304 "%s, but no return statement",
3305 signature
->function_name(),
3306 signature
->return_type
->name
);
3309 /* Function definitions do not have r-values.
3316 ast_jump_statement::hir(exec_list
*instructions
,
3317 struct _mesa_glsl_parse_state
*state
)
3324 assert(state
->current_function
);
3326 if (opt_return_value
) {
3327 ir_rvalue
*const ret
= opt_return_value
->hir(instructions
, state
);
3329 /* The value of the return type can be NULL if the shader says
3330 * 'return foo();' and foo() is a function that returns void.
3332 * NOTE: The GLSL spec doesn't say that this is an error. The type
3333 * of the return value is void. If the return type of the function is
3334 * also void, then this should compile without error. Seriously.
3336 const glsl_type
*const ret_type
=
3337 (ret
== NULL
) ? glsl_type::void_type
: ret
->type
;
3339 /* Implicit conversions are not allowed for return values. */
3340 if (state
->current_function
->return_type
!= ret_type
) {
3341 YYLTYPE loc
= this->get_location();
3343 _mesa_glsl_error(& loc
, state
,
3344 "`return' with wrong type %s, in function `%s' "
3347 state
->current_function
->function_name(),
3348 state
->current_function
->return_type
->name
);
3351 inst
= new(ctx
) ir_return(ret
);
3353 if (state
->current_function
->return_type
->base_type
!=
3355 YYLTYPE loc
= this->get_location();
3357 _mesa_glsl_error(& loc
, state
,
3358 "`return' with no value, in function %s returning "
3360 state
->current_function
->function_name());
3362 inst
= new(ctx
) ir_return
;
3365 state
->found_return
= true;
3366 instructions
->push_tail(inst
);
3371 if (state
->target
!= fragment_shader
) {
3372 YYLTYPE loc
= this->get_location();
3374 _mesa_glsl_error(& loc
, state
,
3375 "`discard' may only appear in a fragment shader");
3377 instructions
->push_tail(new(ctx
) ir_discard
);
3382 if (mode
== ast_continue
&&
3383 state
->loop_nesting_ast
== NULL
) {
3384 YYLTYPE loc
= this->get_location();
3386 _mesa_glsl_error(& loc
, state
,
3387 "continue may only appear in a loop");
3388 } else if (mode
== ast_break
&&
3389 state
->loop_nesting_ast
== NULL
&&
3390 state
->switch_nesting_ast
== NULL
) {
3391 YYLTYPE loc
= this->get_location();
3393 _mesa_glsl_error(& loc
, state
,
3394 "break may only appear in a loop or a switch");
3396 /* For a loop, inline the for loop expression again,
3397 * since we don't know where near the end of
3398 * the loop body the normal copy of it
3399 * is going to be placed.
3401 if (state
->loop_nesting_ast
!= NULL
&&
3402 mode
== ast_continue
&&
3403 state
->loop_nesting_ast
->rest_expression
) {
3404 state
->loop_nesting_ast
->rest_expression
->hir(instructions
,
3408 if (state
->is_switch_innermost
&&
3409 mode
== ast_break
) {
3410 /* Force break out of switch by setting is_break switch state.
3412 ir_variable
*const is_break_var
= state
->is_break_var
;
3413 ir_dereference_variable
*const deref_is_break_var
=
3414 new(ctx
) ir_dereference_variable(is_break_var
);
3415 ir_constant
*const true_val
= new(ctx
) ir_constant(true);
3416 ir_assignment
*const set_break_var
=
3417 new(ctx
) ir_assignment(deref_is_break_var
,
3421 instructions
->push_tail(set_break_var
);
3424 ir_loop_jump
*const jump
=
3425 new(ctx
) ir_loop_jump((mode
== ast_break
)
3426 ? ir_loop_jump::jump_break
3427 : ir_loop_jump::jump_continue
);
3428 instructions
->push_tail(jump
);
3435 /* Jump instructions do not have r-values.
3442 ast_selection_statement::hir(exec_list
*instructions
,
3443 struct _mesa_glsl_parse_state
*state
)
3447 ir_rvalue
*const condition
= this->condition
->hir(instructions
, state
);
3449 /* From page 66 (page 72 of the PDF) of the GLSL 1.50 spec:
3451 * "Any expression whose type evaluates to a Boolean can be used as the
3452 * conditional expression bool-expression. Vector types are not accepted
3453 * as the expression to if."
3455 * The checks are separated so that higher quality diagnostics can be
3456 * generated for cases where both rules are violated.
3458 if (!condition
->type
->is_boolean() || !condition
->type
->is_scalar()) {
3459 YYLTYPE loc
= this->condition
->get_location();
3461 _mesa_glsl_error(& loc
, state
, "if-statement condition must be scalar "
3465 ir_if
*const stmt
= new(ctx
) ir_if(condition
);
3467 if (then_statement
!= NULL
) {
3468 state
->symbols
->push_scope();
3469 then_statement
->hir(& stmt
->then_instructions
, state
);
3470 state
->symbols
->pop_scope();
3473 if (else_statement
!= NULL
) {
3474 state
->symbols
->push_scope();
3475 else_statement
->hir(& stmt
->else_instructions
, state
);
3476 state
->symbols
->pop_scope();
3479 instructions
->push_tail(stmt
);
3481 /* if-statements do not have r-values.
3488 ast_switch_statement::hir(exec_list
*instructions
,
3489 struct _mesa_glsl_parse_state
*state
)
3493 ir_rvalue
*const test_expression
=
3494 this->test_expression
->hir(instructions
, state
);
3496 /* From page 66 (page 55 of the PDF) of the GLSL 1.50 spec:
3498 * "The type of init-expression in a switch statement must be a
3501 * The checks are separated so that higher quality diagnostics can be
3502 * generated for cases where the rule is violated.
3504 if (!test_expression
->type
->is_integer()) {
3505 YYLTYPE loc
= this->test_expression
->get_location();
3507 _mesa_glsl_error(& loc
,
3509 "switch-statement expression must be scalar "
3513 /* Track the switch-statement nesting in a stack-like manner.
3515 ir_variable
*saved_test_var
= state
->test_var
;
3516 ir_variable
*saved_is_fallthru_var
= state
->is_fallthru_var
;
3518 bool save_is_switch_innermost
= state
->is_switch_innermost
;
3519 ast_switch_statement
*saved_nesting_ast
= state
->switch_nesting_ast
;
3521 state
->is_switch_innermost
= true;
3522 state
->switch_nesting_ast
= this;
3524 /* Initalize is_fallthru state to false.
3526 ir_rvalue
*const is_fallthru_val
= new (ctx
) ir_constant(false);
3527 state
->is_fallthru_var
= new(ctx
) ir_variable(glsl_type::bool_type
,
3528 "switch_is_fallthru_tmp",
3530 instructions
->push_tail(state
->is_fallthru_var
);
3532 ir_dereference_variable
*deref_is_fallthru_var
=
3533 new(ctx
) ir_dereference_variable(state
->is_fallthru_var
);
3534 instructions
->push_tail(new(ctx
) ir_assignment(deref_is_fallthru_var
,
3538 /* Initalize is_break state to false.
3540 ir_rvalue
*const is_break_val
= new (ctx
) ir_constant(false);
3541 state
->is_break_var
= new(ctx
) ir_variable(glsl_type::bool_type
,
3542 "switch_is_break_tmp",
3544 instructions
->push_tail(state
->is_break_var
);
3546 ir_dereference_variable
*deref_is_break_var
=
3547 new(ctx
) ir_dereference_variable(state
->is_break_var
);
3548 instructions
->push_tail(new(ctx
) ir_assignment(deref_is_break_var
,
3552 /* Cache test expression.
3554 test_to_hir(instructions
, state
);
3556 /* Emit code for body of switch stmt.
3558 body
->hir(instructions
, state
);
3560 /* Restore previous nesting before returning.
3562 state
->switch_nesting_ast
= saved_nesting_ast
;
3563 state
->is_switch_innermost
= save_is_switch_innermost
;
3565 state
->test_var
= saved_test_var
;
3566 state
->is_fallthru_var
= saved_is_fallthru_var
;
3568 /* Switch statements do not have r-values.
3575 ast_switch_statement::test_to_hir(exec_list
*instructions
,
3576 struct _mesa_glsl_parse_state
*state
)
3580 /* Cache value of test expression.
3582 ir_rvalue
*const test_val
=
3583 test_expression
->hir(instructions
,
3586 state
->test_var
= new(ctx
) ir_variable(glsl_type::int_type
,
3589 ir_dereference_variable
*deref_test_var
=
3590 new(ctx
) ir_dereference_variable(state
->test_var
);
3592 instructions
->push_tail(state
->test_var
);
3593 instructions
->push_tail(new(ctx
) ir_assignment(deref_test_var
,
3600 ast_switch_body::hir(exec_list
*instructions
,
3601 struct _mesa_glsl_parse_state
*state
)
3604 stmts
->hir(instructions
, state
);
3606 /* Switch bodies do not have r-values.
3613 ast_case_statement_list::hir(exec_list
*instructions
,
3614 struct _mesa_glsl_parse_state
*state
)
3616 foreach_list_typed (ast_case_statement
, case_stmt
, link
, & this->cases
)
3617 case_stmt
->hir(instructions
, state
);
3619 /* Case statements do not have r-values.
3626 ast_case_statement::hir(exec_list
*instructions
,
3627 struct _mesa_glsl_parse_state
*state
)
3629 labels
->hir(instructions
, state
);
3631 /* Conditionally set fallthru state based on break state.
3633 ir_constant
*const false_val
= new(state
) ir_constant(false);
3634 ir_dereference_variable
*const deref_is_fallthru_var
=
3635 new(state
) ir_dereference_variable(state
->is_fallthru_var
);
3636 ir_dereference_variable
*const deref_is_break_var
=
3637 new(state
) ir_dereference_variable(state
->is_break_var
);
3638 ir_assignment
*const reset_fallthru_on_break
=
3639 new(state
) ir_assignment(deref_is_fallthru_var
,
3641 deref_is_break_var
);
3642 instructions
->push_tail(reset_fallthru_on_break
);
3644 /* Guard case statements depending on fallthru state.
3646 ir_dereference_variable
*const deref_fallthru_guard
=
3647 new(state
) ir_dereference_variable(state
->is_fallthru_var
);
3648 ir_if
*const test_fallthru
= new(state
) ir_if(deref_fallthru_guard
);
3650 foreach_list_typed (ast_node
, stmt
, link
, & this->stmts
)
3651 stmt
->hir(& test_fallthru
->then_instructions
, state
);
3653 instructions
->push_tail(test_fallthru
);
3655 /* Case statements do not have r-values.
3662 ast_case_label_list::hir(exec_list
*instructions
,
3663 struct _mesa_glsl_parse_state
*state
)
3665 foreach_list_typed (ast_case_label
, label
, link
, & this->labels
)
3666 label
->hir(instructions
, state
);
3668 /* Case labels do not have r-values.
3675 ast_case_label::hir(exec_list
*instructions
,
3676 struct _mesa_glsl_parse_state
*state
)
3680 ir_dereference_variable
*deref_fallthru_var
=
3681 new(ctx
) ir_dereference_variable(state
->is_fallthru_var
);
3683 ir_rvalue
*const true_val
= new(ctx
) ir_constant(true);
3685 /* If not default case, ...
3687 if (this->test_value
!= NULL
) {
3688 /* Conditionally set fallthru state based on
3689 * comparison of cached test expression value to case label.
3691 ir_rvalue
*const test_val
= this->test_value
->hir(instructions
, state
);
3693 ir_dereference_variable
*deref_test_var
=
3694 new(ctx
) ir_dereference_variable(state
->test_var
);
3696 ir_rvalue
*const test_cond
= new(ctx
) ir_expression(ir_binop_all_equal
,
3697 glsl_type::bool_type
,
3701 ir_assignment
*set_fallthru_on_test
=
3702 new(ctx
) ir_assignment(deref_fallthru_var
,
3706 instructions
->push_tail(set_fallthru_on_test
);
3707 } else { /* default case */
3708 /* Set falltrhu state.
3710 ir_assignment
*set_fallthru
=
3711 new(ctx
) ir_assignment(deref_fallthru_var
,
3715 instructions
->push_tail(set_fallthru
);
3718 /* Case statements do not have r-values.
3725 ast_iteration_statement::condition_to_hir(ir_loop
*stmt
,
3726 struct _mesa_glsl_parse_state
*state
)
3730 if (condition
!= NULL
) {
3731 ir_rvalue
*const cond
=
3732 condition
->hir(& stmt
->body_instructions
, state
);
3735 || !cond
->type
->is_boolean() || !cond
->type
->is_scalar()) {
3736 YYLTYPE loc
= condition
->get_location();
3738 _mesa_glsl_error(& loc
, state
,
3739 "loop condition must be scalar boolean");
3741 /* As the first code in the loop body, generate a block that looks
3742 * like 'if (!condition) break;' as the loop termination condition.
3744 ir_rvalue
*const not_cond
=
3745 new(ctx
) ir_expression(ir_unop_logic_not
, glsl_type::bool_type
, cond
,
3748 ir_if
*const if_stmt
= new(ctx
) ir_if(not_cond
);
3750 ir_jump
*const break_stmt
=
3751 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
3753 if_stmt
->then_instructions
.push_tail(break_stmt
);
3754 stmt
->body_instructions
.push_tail(if_stmt
);
3761 ast_iteration_statement::hir(exec_list
*instructions
,
3762 struct _mesa_glsl_parse_state
*state
)
3766 /* For-loops and while-loops start a new scope, but do-while loops do not.
3768 if (mode
!= ast_do_while
)
3769 state
->symbols
->push_scope();
3771 if (init_statement
!= NULL
)
3772 init_statement
->hir(instructions
, state
);
3774 ir_loop
*const stmt
= new(ctx
) ir_loop();
3775 instructions
->push_tail(stmt
);
3777 /* Track the current loop nesting.
3779 ast_iteration_statement
*nesting_ast
= state
->loop_nesting_ast
;
3781 state
->loop_nesting_ast
= this;
3783 /* Likewise, indicate that following code is closest to a loop,
3784 * NOT closest to a switch.
3786 bool saved_is_switch_innermost
= state
->is_switch_innermost
;
3787 state
->is_switch_innermost
= false;
3789 if (mode
!= ast_do_while
)
3790 condition_to_hir(stmt
, state
);
3793 body
->hir(& stmt
->body_instructions
, state
);
3795 if (rest_expression
!= NULL
)
3796 rest_expression
->hir(& stmt
->body_instructions
, state
);
3798 if (mode
== ast_do_while
)
3799 condition_to_hir(stmt
, state
);
3801 if (mode
!= ast_do_while
)
3802 state
->symbols
->pop_scope();
3804 /* Restore previous nesting before returning.
3806 state
->loop_nesting_ast
= nesting_ast
;
3807 state
->is_switch_innermost
= saved_is_switch_innermost
;
3809 /* Loops do not have r-values.
3816 ast_type_specifier::hir(exec_list
*instructions
,
3817 struct _mesa_glsl_parse_state
*state
)
3819 if (!this->is_precision_statement
&& this->structure
== NULL
)
3822 YYLTYPE loc
= this->get_location();
3824 if (this->precision
!= ast_precision_none
3825 && state
->language_version
!= 100
3826 && state
->language_version
< 130) {
3827 _mesa_glsl_error(&loc
, state
,
3828 "precision qualifiers exist only in "
3829 "GLSL ES 1.00, and GLSL 1.30 and later");
3832 if (this->precision
!= ast_precision_none
3833 && this->structure
!= NULL
) {
3834 _mesa_glsl_error(&loc
, state
,
3835 "precision qualifiers do not apply to structures");
3839 /* If this is a precision statement, check that the type to which it is
3840 * applied is either float or int.
3842 * From section 4.5.3 of the GLSL 1.30 spec:
3843 * "The precision statement
3844 * precision precision-qualifier type;
3845 * can be used to establish a default precision qualifier. The type
3846 * field can be either int or float [...]. Any other types or
3847 * qualifiers will result in an error.
3849 if (this->is_precision_statement
) {
3850 assert(this->precision
!= ast_precision_none
);
3851 assert(this->structure
== NULL
); /* The check for structures was
3852 * performed above. */
3853 if (this->is_array
) {
3854 _mesa_glsl_error(&loc
, state
,
3855 "default precision statements do not apply to "
3859 if (this->type_specifier
!= ast_float
3860 && this->type_specifier
!= ast_int
) {
3861 _mesa_glsl_error(&loc
, state
,
3862 "default precision statements apply only to types "
3867 /* FINISHME: Translate precision statements into IR. */
3871 if (this->structure
!= NULL
)
3872 return this->structure
->hir(instructions
, state
);
3879 ast_struct_specifier::hir(exec_list
*instructions
,
3880 struct _mesa_glsl_parse_state
*state
)
3882 unsigned decl_count
= 0;
3884 /* Make an initial pass over the list of structure fields to determine how
3885 * many there are. Each element in this list is an ast_declarator_list.
3886 * This means that we actually need to count the number of elements in the
3887 * 'declarations' list in each of the elements.
3889 foreach_list_typed (ast_declarator_list
, decl_list
, link
,
3890 &this->declarations
) {
3891 foreach_list_const (decl_ptr
, & decl_list
->declarations
) {
3896 /* Allocate storage for the structure fields and process the field
3897 * declarations. As the declarations are processed, try to also convert
3898 * the types to HIR. This ensures that structure definitions embedded in
3899 * other structure definitions are processed.
3901 glsl_struct_field
*const fields
= ralloc_array(state
, glsl_struct_field
,
3905 foreach_list_typed (ast_declarator_list
, decl_list
, link
,
3906 &this->declarations
) {
3907 const char *type_name
;
3909 decl_list
->type
->specifier
->hir(instructions
, state
);
3911 /* Section 10.9 of the GLSL ES 1.00 specification states that
3912 * embedded structure definitions have been removed from the language.
3914 if (state
->es_shader
&& decl_list
->type
->specifier
->structure
!= NULL
) {
3915 YYLTYPE loc
= this->get_location();
3916 _mesa_glsl_error(&loc
, state
, "Embedded structure definitions are "
3917 "not allowed in GLSL ES 1.00.");
3920 const glsl_type
*decl_type
=
3921 decl_list
->type
->specifier
->glsl_type(& type_name
, state
);
3923 foreach_list_typed (ast_declaration
, decl
, link
,
3924 &decl_list
->declarations
) {
3925 const struct glsl_type
*field_type
= decl_type
;
3926 if (decl
->is_array
) {
3927 YYLTYPE loc
= decl
->get_location();
3928 field_type
= process_array_type(&loc
, decl_type
, decl
->array_size
,
3931 fields
[i
].type
= (field_type
!= NULL
)
3932 ? field_type
: glsl_type::error_type
;
3933 fields
[i
].name
= decl
->identifier
;
3938 assert(i
== decl_count
);
3940 const glsl_type
*t
=
3941 glsl_type::get_record_instance(fields
, decl_count
, this->name
);
3943 YYLTYPE loc
= this->get_location();
3944 if (!state
->symbols
->add_type(name
, t
)) {
3945 _mesa_glsl_error(& loc
, state
, "struct `%s' previously defined", name
);
3947 const glsl_type
**s
= reralloc(state
, state
->user_structures
,
3949 state
->num_user_structures
+ 1);
3951 s
[state
->num_user_structures
] = t
;
3952 state
->user_structures
= s
;
3953 state
->num_user_structures
++;
3957 /* Structure type definitions do not have r-values.