2 * Copyright © 2010 Intel Corporation
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
21 * DEALINGS IN THE SOFTWARE.
26 * Convert abstract syntax to to high-level intermediate reprensentation (HIR).
28 * During the conversion to HIR, the majority of the symantic checking is
29 * preformed on the program. This includes:
31 * * Symbol table management
35 * The majority of this work could be done during parsing, and the parser could
36 * probably generate HIR directly. However, this results in frequent changes
37 * to the parser code. Since we do not assume that every system this complier
38 * is built on will have Flex and Bison installed, we have to store the code
39 * generated by these tools in our version control system. In other parts of
40 * the system we've seen problems where a parser was changed but the generated
41 * code was not committed, merge conflicts where created because two developers
42 * had slightly different versions of Bison installed, etc.
44 * I have also noticed that running Bison generated parsers in GDB is very
45 * irritating. When you get a segfault on '$$ = $1->foo', you can't very
46 * well 'print $1' in GDB.
48 * As a result, my preference is to put as little C code as possible in the
49 * parser (and lexer) sources.
52 #include "main/core.h" /* for struct gl_extensions */
53 #include "glsl_symbol_table.h"
54 #include "glsl_parser_extras.h"
56 #include "glsl_types.h"
60 _mesa_ast_to_hir(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
)
62 _mesa_glsl_initialize_variables(instructions
, state
);
63 _mesa_glsl_initialize_functions(state
);
65 state
->symbols
->language_version
= state
->language_version
;
67 state
->current_function
= NULL
;
69 /* Section 4.2 of the GLSL 1.20 specification states:
70 * "The built-in functions are scoped in a scope outside the global scope
71 * users declare global variables in. That is, a shader's global scope,
72 * available for user-defined functions and global variables, is nested
73 * inside the scope containing the built-in functions."
75 * Since built-in functions like ftransform() access built-in variables,
76 * it follows that those must be in the outer scope as well.
78 * We push scope here to create this nesting effect...but don't pop.
79 * This way, a shader's globals are still in the symbol table for use
82 state
->symbols
->push_scope();
84 foreach_list_typed (ast_node
, ast
, link
, & state
->translation_unit
)
85 ast
->hir(instructions
, state
);
90 * If a conversion is available, convert one operand to a different type
92 * The \c from \c ir_rvalue is converted "in place".
94 * \param to Type that the operand it to be converted to
95 * \param from Operand that is being converted
96 * \param state GLSL compiler state
99 * If a conversion is possible (or unnecessary), \c true is returned.
100 * Otherwise \c false is returned.
103 apply_implicit_conversion(const glsl_type
*to
, ir_rvalue
* &from
,
104 struct _mesa_glsl_parse_state
*state
)
107 if (to
->base_type
== from
->type
->base_type
)
110 /* This conversion was added in GLSL 1.20. If the compilation mode is
111 * GLSL 1.10, the conversion is skipped.
113 if (state
->language_version
< 120)
116 /* From page 27 (page 33 of the PDF) of the GLSL 1.50 spec:
118 * "There are no implicit array or structure conversions. For
119 * example, an array of int cannot be implicitly converted to an
120 * array of float. There are no implicit conversions between
121 * signed and unsigned integers."
123 /* FINISHME: The above comment is partially a lie. There is int/uint
124 * FINISHME: conversion for immediate constants.
126 if (!to
->is_float() || !from
->type
->is_numeric())
129 /* Convert to a floating point type with the same number of components
130 * as the original type - i.e. int to float, not int to vec4.
132 to
= glsl_type::get_instance(GLSL_TYPE_FLOAT
, from
->type
->vector_elements
,
133 from
->type
->matrix_columns
);
135 switch (from
->type
->base_type
) {
137 from
= new(ctx
) ir_expression(ir_unop_i2f
, to
, from
, NULL
);
140 from
= new(ctx
) ir_expression(ir_unop_u2f
, to
, from
, NULL
);
143 from
= new(ctx
) ir_expression(ir_unop_b2f
, to
, from
, NULL
);
153 static const struct glsl_type
*
154 arithmetic_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
156 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
158 const glsl_type
*type_a
= value_a
->type
;
159 const glsl_type
*type_b
= value_b
->type
;
161 /* From GLSL 1.50 spec, page 56:
163 * "The arithmetic binary operators add (+), subtract (-),
164 * multiply (*), and divide (/) operate on integer and
165 * floating-point scalars, vectors, and matrices."
167 if (!type_a
->is_numeric() || !type_b
->is_numeric()) {
168 _mesa_glsl_error(loc
, state
,
169 "Operands to arithmetic operators must be numeric");
170 return glsl_type::error_type
;
174 /* "If one operand is floating-point based and the other is
175 * not, then the conversions from Section 4.1.10 "Implicit
176 * Conversions" are applied to the non-floating-point-based operand."
178 if (!apply_implicit_conversion(type_a
, value_b
, state
)
179 && !apply_implicit_conversion(type_b
, value_a
, state
)) {
180 _mesa_glsl_error(loc
, state
,
181 "Could not implicitly convert operands to "
182 "arithmetic operator");
183 return glsl_type::error_type
;
185 type_a
= value_a
->type
;
186 type_b
= value_b
->type
;
188 /* "If the operands are integer types, they must both be signed or
191 * From this rule and the preceeding conversion it can be inferred that
192 * both types must be GLSL_TYPE_FLOAT, or GLSL_TYPE_UINT, or GLSL_TYPE_INT.
193 * The is_numeric check above already filtered out the case where either
194 * type is not one of these, so now the base types need only be tested for
197 if (type_a
->base_type
!= type_b
->base_type
) {
198 _mesa_glsl_error(loc
, state
,
199 "base type mismatch for arithmetic operator");
200 return glsl_type::error_type
;
203 /* "All arithmetic binary operators result in the same fundamental type
204 * (signed integer, unsigned integer, or floating-point) as the
205 * operands they operate on, after operand type conversion. After
206 * conversion, the following cases are valid
208 * * The two operands are scalars. In this case the operation is
209 * applied, resulting in a scalar."
211 if (type_a
->is_scalar() && type_b
->is_scalar())
214 /* "* One operand is a scalar, and the other is a vector or matrix.
215 * In this case, the scalar operation is applied independently to each
216 * component of the vector or matrix, resulting in the same size
219 if (type_a
->is_scalar()) {
220 if (!type_b
->is_scalar())
222 } else if (type_b
->is_scalar()) {
226 /* All of the combinations of <scalar, scalar>, <vector, scalar>,
227 * <scalar, vector>, <scalar, matrix>, and <matrix, scalar> have been
230 assert(!type_a
->is_scalar());
231 assert(!type_b
->is_scalar());
233 /* "* The two operands are vectors of the same size. In this case, the
234 * operation is done component-wise resulting in the same size
237 if (type_a
->is_vector() && type_b
->is_vector()) {
238 if (type_a
== type_b
) {
241 _mesa_glsl_error(loc
, state
,
242 "vector size mismatch for arithmetic operator");
243 return glsl_type::error_type
;
247 /* All of the combinations of <scalar, scalar>, <vector, scalar>,
248 * <scalar, vector>, <scalar, matrix>, <matrix, scalar>, and
249 * <vector, vector> have been handled. At least one of the operands must
250 * be matrix. Further, since there are no integer matrix types, the base
251 * type of both operands must be float.
253 assert(type_a
->is_matrix() || type_b
->is_matrix());
254 assert(type_a
->base_type
== GLSL_TYPE_FLOAT
);
255 assert(type_b
->base_type
== GLSL_TYPE_FLOAT
);
257 /* "* The operator is add (+), subtract (-), or divide (/), and the
258 * operands are matrices with the same number of rows and the same
259 * number of columns. In this case, the operation is done component-
260 * wise resulting in the same size matrix."
261 * * The operator is multiply (*), where both operands are matrices or
262 * one operand is a vector and the other a matrix. A right vector
263 * operand is treated as a column vector and a left vector operand as a
264 * row vector. In all these cases, it is required that the number of
265 * columns of the left operand is equal to the number of rows of the
266 * right operand. Then, the multiply (*) operation does a linear
267 * algebraic multiply, yielding an object that has the same number of
268 * rows as the left operand and the same number of columns as the right
269 * operand. Section 5.10 "Vector and Matrix Operations" explains in
270 * more detail how vectors and matrices are operated on."
273 if (type_a
== type_b
)
276 if (type_a
->is_matrix() && type_b
->is_matrix()) {
277 /* Matrix multiply. The columns of A must match the rows of B. Given
278 * the other previously tested constraints, this means the vector type
279 * of a row from A must be the same as the vector type of a column from
282 if (type_a
->row_type() == type_b
->column_type()) {
283 /* The resulting matrix has the number of columns of matrix B and
284 * the number of rows of matrix A. We get the row count of A by
285 * looking at the size of a vector that makes up a column. The
286 * transpose (size of a row) is done for B.
288 const glsl_type
*const type
=
289 glsl_type::get_instance(type_a
->base_type
,
290 type_a
->column_type()->vector_elements
,
291 type_b
->row_type()->vector_elements
);
292 assert(type
!= glsl_type::error_type
);
296 } else if (type_a
->is_matrix()) {
297 /* A is a matrix and B is a column vector. Columns of A must match
298 * rows of B. Given the other previously tested constraints, this
299 * means the vector type of a row from A must be the same as the
300 * vector the type of B.
302 if (type_a
->row_type() == type_b
) {
303 /* The resulting vector has a number of elements equal to
304 * the number of rows of matrix A. */
305 const glsl_type
*const type
=
306 glsl_type::get_instance(type_a
->base_type
,
307 type_a
->column_type()->vector_elements
,
309 assert(type
!= glsl_type::error_type
);
314 assert(type_b
->is_matrix());
316 /* A is a row vector and B is a matrix. Columns of A must match rows
317 * of B. Given the other previously tested constraints, this means
318 * the type of A must be the same as the vector type of a column from
321 if (type_a
== type_b
->column_type()) {
322 /* The resulting vector has a number of elements equal to
323 * the number of columns of matrix B. */
324 const glsl_type
*const type
=
325 glsl_type::get_instance(type_a
->base_type
,
326 type_b
->row_type()->vector_elements
,
328 assert(type
!= glsl_type::error_type
);
334 _mesa_glsl_error(loc
, state
, "size mismatch for matrix multiplication");
335 return glsl_type::error_type
;
339 /* "All other cases are illegal."
341 _mesa_glsl_error(loc
, state
, "type mismatch");
342 return glsl_type::error_type
;
346 static const struct glsl_type
*
347 unary_arithmetic_result_type(const struct glsl_type
*type
,
348 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
350 /* From GLSL 1.50 spec, page 57:
352 * "The arithmetic unary operators negate (-), post- and pre-increment
353 * and decrement (-- and ++) operate on integer or floating-point
354 * values (including vectors and matrices). All unary operators work
355 * component-wise on their operands. These result with the same type
358 if (!type
->is_numeric()) {
359 _mesa_glsl_error(loc
, state
,
360 "Operands to arithmetic operators must be numeric");
361 return glsl_type::error_type
;
368 * \brief Return the result type of a bit-logic operation.
370 * If the given types to the bit-logic operator are invalid, return
371 * glsl_type::error_type.
373 * \param type_a Type of LHS of bit-logic op
374 * \param type_b Type of RHS of bit-logic op
376 static const struct glsl_type
*
377 bit_logic_result_type(const struct glsl_type
*type_a
,
378 const struct glsl_type
*type_b
,
380 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
382 if (state
->language_version
< 130) {
383 _mesa_glsl_error(loc
, state
, "bit operations require GLSL 1.30");
384 return glsl_type::error_type
;
387 /* From page 50 (page 56 of PDF) of GLSL 1.30 spec:
389 * "The bitwise operators and (&), exclusive-or (^), and inclusive-or
390 * (|). The operands must be of type signed or unsigned integers or
393 if (!type_a
->is_integer()) {
394 _mesa_glsl_error(loc
, state
, "LHS of `%s' must be an integer",
395 ast_expression::operator_string(op
));
396 return glsl_type::error_type
;
398 if (!type_b
->is_integer()) {
399 _mesa_glsl_error(loc
, state
, "RHS of `%s' must be an integer",
400 ast_expression::operator_string(op
));
401 return glsl_type::error_type
;
404 /* "The fundamental types of the operands (signed or unsigned) must
407 if (type_a
->base_type
!= type_b
->base_type
) {
408 _mesa_glsl_error(loc
, state
, "operands of `%s' must have the same "
409 "base type", ast_expression::operator_string(op
));
410 return glsl_type::error_type
;
413 /* "The operands cannot be vectors of differing size." */
414 if (type_a
->is_vector() &&
415 type_b
->is_vector() &&
416 type_a
->vector_elements
!= type_b
->vector_elements
) {
417 _mesa_glsl_error(loc
, state
, "operands of `%s' cannot be vectors of "
418 "different sizes", ast_expression::operator_string(op
));
419 return glsl_type::error_type
;
422 /* "If one operand is a scalar and the other a vector, the scalar is
423 * applied component-wise to the vector, resulting in the same type as
424 * the vector. The fundamental types of the operands [...] will be the
425 * resulting fundamental type."
427 if (type_a
->is_scalar())
433 static const struct glsl_type
*
434 modulus_result_type(const struct glsl_type
*type_a
,
435 const struct glsl_type
*type_b
,
436 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
438 if (state
->language_version
< 130) {
439 _mesa_glsl_error(loc
, state
,
440 "operator '%%' is reserved in %s",
441 state
->version_string
);
442 return glsl_type::error_type
;
445 /* From GLSL 1.50 spec, page 56:
446 * "The operator modulus (%) operates on signed or unsigned integers or
447 * integer vectors. The operand types must both be signed or both be
450 if (!type_a
->is_integer()) {
451 _mesa_glsl_error(loc
, state
, "LHS of operator %% must be an integer.");
452 return glsl_type::error_type
;
454 if (!type_b
->is_integer()) {
455 _mesa_glsl_error(loc
, state
, "RHS of operator %% must be an integer.");
456 return glsl_type::error_type
;
458 if (type_a
->base_type
!= type_b
->base_type
) {
459 _mesa_glsl_error(loc
, state
,
460 "operands of %% must have the same base type");
461 return glsl_type::error_type
;
464 /* "The operands cannot be vectors of differing size. If one operand is
465 * a scalar and the other vector, then the scalar is applied component-
466 * wise to the vector, resulting in the same type as the vector. If both
467 * are vectors of the same size, the result is computed component-wise."
469 if (type_a
->is_vector()) {
470 if (!type_b
->is_vector()
471 || (type_a
->vector_elements
== type_b
->vector_elements
))
476 /* "The operator modulus (%) is not defined for any other data types
477 * (non-integer types)."
479 _mesa_glsl_error(loc
, state
, "type mismatch");
480 return glsl_type::error_type
;
484 static const struct glsl_type
*
485 relational_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
486 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
488 const glsl_type
*type_a
= value_a
->type
;
489 const glsl_type
*type_b
= value_b
->type
;
491 /* From GLSL 1.50 spec, page 56:
492 * "The relational operators greater than (>), less than (<), greater
493 * than or equal (>=), and less than or equal (<=) operate only on
494 * scalar integer and scalar floating-point expressions."
496 if (!type_a
->is_numeric()
497 || !type_b
->is_numeric()
498 || !type_a
->is_scalar()
499 || !type_b
->is_scalar()) {
500 _mesa_glsl_error(loc
, state
,
501 "Operands to relational operators must be scalar and "
503 return glsl_type::error_type
;
506 /* "Either the operands' types must match, or the conversions from
507 * Section 4.1.10 "Implicit Conversions" will be applied to the integer
508 * operand, after which the types must match."
510 if (!apply_implicit_conversion(type_a
, value_b
, state
)
511 && !apply_implicit_conversion(type_b
, value_a
, state
)) {
512 _mesa_glsl_error(loc
, state
,
513 "Could not implicitly convert operands to "
514 "relational operator");
515 return glsl_type::error_type
;
517 type_a
= value_a
->type
;
518 type_b
= value_b
->type
;
520 if (type_a
->base_type
!= type_b
->base_type
) {
521 _mesa_glsl_error(loc
, state
, "base type mismatch");
522 return glsl_type::error_type
;
525 /* "The result is scalar Boolean."
527 return glsl_type::bool_type
;
531 * \brief Return the result type of a bit-shift operation.
533 * If the given types to the bit-shift operator are invalid, return
534 * glsl_type::error_type.
536 * \param type_a Type of LHS of bit-shift op
537 * \param type_b Type of RHS of bit-shift op
539 static const struct glsl_type
*
540 shift_result_type(const struct glsl_type
*type_a
,
541 const struct glsl_type
*type_b
,
543 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
545 if (state
->language_version
< 130) {
546 _mesa_glsl_error(loc
, state
, "bit operations require GLSL 1.30");
547 return glsl_type::error_type
;
550 /* From page 50 (page 56 of the PDF) of the GLSL 1.30 spec:
552 * "The shift operators (<<) and (>>). For both operators, the operands
553 * must be signed or unsigned integers or integer vectors. One operand
554 * can be signed while the other is unsigned."
556 if (!type_a
->is_integer()) {
557 _mesa_glsl_error(loc
, state
, "LHS of operator %s must be an integer or "
558 "integer vector", ast_expression::operator_string(op
));
559 return glsl_type::error_type
;
562 if (!type_b
->is_integer()) {
563 _mesa_glsl_error(loc
, state
, "RHS of operator %s must be an integer or "
564 "integer vector", ast_expression::operator_string(op
));
565 return glsl_type::error_type
;
568 /* "If the first operand is a scalar, the second operand has to be
571 if (type_a
->is_scalar() && !type_b
->is_scalar()) {
572 _mesa_glsl_error(loc
, state
, "If the first operand of %s is scalar, the "
573 "second must be scalar as well",
574 ast_expression::operator_string(op
));
575 return glsl_type::error_type
;
578 /* If both operands are vectors, check that they have same number of
581 if (type_a
->is_vector() &&
582 type_b
->is_vector() &&
583 type_a
->vector_elements
!= type_b
->vector_elements
) {
584 _mesa_glsl_error(loc
, state
, "Vector operands to operator %s must "
585 "have same number of elements",
586 ast_expression::operator_string(op
));
587 return glsl_type::error_type
;
590 /* "In all cases, the resulting type will be the same type as the left
597 * Validates that a value can be assigned to a location with a specified type
599 * Validates that \c rhs can be assigned to some location. If the types are
600 * not an exact match but an automatic conversion is possible, \c rhs will be
604 * \c NULL if \c rhs cannot be assigned to a location with type \c lhs_type.
605 * Otherwise the actual RHS to be assigned will be returned. This may be
606 * \c rhs, or it may be \c rhs after some type conversion.
609 * In addition to being used for assignments, this function is used to
610 * type-check return values.
613 validate_assignment(struct _mesa_glsl_parse_state
*state
,
614 const glsl_type
*lhs_type
, ir_rvalue
*rhs
,
617 /* If there is already some error in the RHS, just return it. Anything
618 * else will lead to an avalanche of error message back to the user.
620 if (rhs
->type
->is_error())
623 /* If the types are identical, the assignment can trivially proceed.
625 if (rhs
->type
== lhs_type
)
628 /* If the array element types are the same and the size of the LHS is zero,
629 * the assignment is okay for initializers embedded in variable
632 * Note: Whole-array assignments are not permitted in GLSL 1.10, but this
633 * is handled by ir_dereference::is_lvalue.
635 if (is_initializer
&& lhs_type
->is_array() && rhs
->type
->is_array()
636 && (lhs_type
->element_type() == rhs
->type
->element_type())
637 && (lhs_type
->array_size() == 0)) {
641 /* Check for implicit conversion in GLSL 1.20 */
642 if (apply_implicit_conversion(lhs_type
, rhs
, state
)) {
643 if (rhs
->type
== lhs_type
)
651 do_assignment(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
,
652 ir_rvalue
*lhs
, ir_rvalue
*rhs
, bool is_initializer
,
656 bool error_emitted
= (lhs
->type
->is_error() || rhs
->type
->is_error());
658 if (!error_emitted
) {
659 if (lhs
->variable_referenced() != NULL
660 && lhs
->variable_referenced()->read_only
) {
661 _mesa_glsl_error(&lhs_loc
, state
,
662 "assignment to read-only variable '%s'",
663 lhs
->variable_referenced()->name
);
664 error_emitted
= true;
666 } else if (!lhs
->is_lvalue()) {
667 _mesa_glsl_error(& lhs_loc
, state
, "non-lvalue in assignment");
668 error_emitted
= true;
671 if (state
->es_shader
&& lhs
->type
->is_array()) {
672 _mesa_glsl_error(&lhs_loc
, state
, "whole array assignment is not "
673 "allowed in GLSL ES 1.00.");
674 error_emitted
= true;
679 validate_assignment(state
, lhs
->type
, rhs
, is_initializer
);
680 if (new_rhs
== NULL
) {
681 _mesa_glsl_error(& lhs_loc
, state
, "type mismatch");
685 /* If the LHS array was not declared with a size, it takes it size from
686 * the RHS. If the LHS is an l-value and a whole array, it must be a
687 * dereference of a variable. Any other case would require that the LHS
688 * is either not an l-value or not a whole array.
690 if (lhs
->type
->array_size() == 0) {
691 ir_dereference
*const d
= lhs
->as_dereference();
695 ir_variable
*const var
= d
->variable_referenced();
699 if (var
->max_array_access
>= unsigned(rhs
->type
->array_size())) {
700 /* FINISHME: This should actually log the location of the RHS. */
701 _mesa_glsl_error(& lhs_loc
, state
, "array size must be > %u due to "
703 var
->max_array_access
);
706 var
->type
= glsl_type::get_array_instance(lhs
->type
->element_type(),
707 rhs
->type
->array_size());
712 /* Most callers of do_assignment (assign, add_assign, pre_inc/dec,
713 * but not post_inc) need the converted assigned value as an rvalue
714 * to handle things like:
718 * So we always just store the computed value being assigned to a
719 * temporary and return a deref of that temporary. If the rvalue
720 * ends up not being used, the temp will get copy-propagated out.
722 ir_variable
*var
= new(ctx
) ir_variable(rhs
->type
, "assignment_tmp",
724 ir_dereference_variable
*deref_var
= new(ctx
) ir_dereference_variable(var
);
725 instructions
->push_tail(var
);
726 instructions
->push_tail(new(ctx
) ir_assignment(deref_var
,
729 deref_var
= new(ctx
) ir_dereference_variable(var
);
732 instructions
->push_tail(new(ctx
) ir_assignment(lhs
, deref_var
, NULL
));
734 return new(ctx
) ir_dereference_variable(var
);
738 get_lvalue_copy(exec_list
*instructions
, ir_rvalue
*lvalue
)
740 void *ctx
= ralloc_parent(lvalue
);
743 var
= new(ctx
) ir_variable(lvalue
->type
, "_post_incdec_tmp",
745 instructions
->push_tail(var
);
746 var
->mode
= ir_var_auto
;
748 instructions
->push_tail(new(ctx
) ir_assignment(new(ctx
) ir_dereference_variable(var
),
751 /* Once we've created this temporary, mark it read only so it's no
752 * longer considered an lvalue.
754 var
->read_only
= true;
756 return new(ctx
) ir_dereference_variable(var
);
761 ast_node::hir(exec_list
*instructions
,
762 struct _mesa_glsl_parse_state
*state
)
771 mark_whole_array_access(ir_rvalue
*access
)
773 ir_dereference_variable
*deref
= access
->as_dereference_variable();
776 deref
->var
->max_array_access
= deref
->type
->length
- 1;
781 do_comparison(void *mem_ctx
, int operation
, ir_rvalue
*op0
, ir_rvalue
*op1
)
784 ir_rvalue
*cmp
= NULL
;
786 if (operation
== ir_binop_all_equal
)
787 join_op
= ir_binop_logic_and
;
789 join_op
= ir_binop_logic_or
;
791 switch (op0
->type
->base_type
) {
792 case GLSL_TYPE_FLOAT
:
796 return new(mem_ctx
) ir_expression(operation
, op0
, op1
);
798 case GLSL_TYPE_ARRAY
: {
799 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
800 ir_rvalue
*e0
, *e1
, *result
;
802 e0
= new(mem_ctx
) ir_dereference_array(op0
->clone(mem_ctx
, NULL
),
803 new(mem_ctx
) ir_constant(i
));
804 e1
= new(mem_ctx
) ir_dereference_array(op1
->clone(mem_ctx
, NULL
),
805 new(mem_ctx
) ir_constant(i
));
806 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
809 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
815 mark_whole_array_access(op0
);
816 mark_whole_array_access(op1
);
820 case GLSL_TYPE_STRUCT
: {
821 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
822 ir_rvalue
*e0
, *e1
, *result
;
823 const char *field_name
= op0
->type
->fields
.structure
[i
].name
;
825 e0
= new(mem_ctx
) ir_dereference_record(op0
->clone(mem_ctx
, NULL
),
827 e1
= new(mem_ctx
) ir_dereference_record(op1
->clone(mem_ctx
, NULL
),
829 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
832 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
840 case GLSL_TYPE_ERROR
:
842 case GLSL_TYPE_SAMPLER
:
843 /* I assume a comparison of a struct containing a sampler just
844 * ignores the sampler present in the type.
849 assert(!"Should not get here.");
854 cmp
= new(mem_ctx
) ir_constant(true);
859 /* For logical operations, we want to ensure that the operands are
860 * scalar booleans. If it isn't, emit an error and return a constant
861 * boolean to avoid triggering cascading error messages.
864 get_scalar_boolean_operand(exec_list
*instructions
,
865 struct _mesa_glsl_parse_state
*state
,
866 ast_expression
*parent_expr
,
868 const char *operand_name
,
871 ast_expression
*expr
= parent_expr
->subexpressions
[operand
];
873 ir_rvalue
*val
= expr
->hir(instructions
, state
);
875 if (val
->type
->is_boolean() && val
->type
->is_scalar())
878 if (!*error_emitted
) {
879 YYLTYPE loc
= expr
->get_location();
880 _mesa_glsl_error(&loc
, state
, "%s of `%s' must be scalar boolean",
882 parent_expr
->operator_string(parent_expr
->oper
));
883 *error_emitted
= true;
886 return new(ctx
) ir_constant(true);
890 ast_expression::hir(exec_list
*instructions
,
891 struct _mesa_glsl_parse_state
*state
)
894 static const int operations
[AST_NUM_OPERATORS
] = {
895 -1, /* ast_assign doesn't convert to ir_expression. */
896 -1, /* ast_plus doesn't convert to ir_expression. */
920 /* Note: The following block of expression types actually convert
921 * to multiple IR instructions.
923 ir_binop_mul
, /* ast_mul_assign */
924 ir_binop_div
, /* ast_div_assign */
925 ir_binop_mod
, /* ast_mod_assign */
926 ir_binop_add
, /* ast_add_assign */
927 ir_binop_sub
, /* ast_sub_assign */
928 ir_binop_lshift
, /* ast_ls_assign */
929 ir_binop_rshift
, /* ast_rs_assign */
930 ir_binop_bit_and
, /* ast_and_assign */
931 ir_binop_bit_xor
, /* ast_xor_assign */
932 ir_binop_bit_or
, /* ast_or_assign */
934 -1, /* ast_conditional doesn't convert to ir_expression. */
935 ir_binop_add
, /* ast_pre_inc. */
936 ir_binop_sub
, /* ast_pre_dec. */
937 ir_binop_add
, /* ast_post_inc. */
938 ir_binop_sub
, /* ast_post_dec. */
939 -1, /* ast_field_selection doesn't conv to ir_expression. */
940 -1, /* ast_array_index doesn't convert to ir_expression. */
941 -1, /* ast_function_call doesn't conv to ir_expression. */
942 -1, /* ast_identifier doesn't convert to ir_expression. */
943 -1, /* ast_int_constant doesn't convert to ir_expression. */
944 -1, /* ast_uint_constant doesn't conv to ir_expression. */
945 -1, /* ast_float_constant doesn't conv to ir_expression. */
946 -1, /* ast_bool_constant doesn't conv to ir_expression. */
947 -1, /* ast_sequence doesn't convert to ir_expression. */
949 ir_rvalue
*result
= NULL
;
951 const struct glsl_type
*type
; /* a temporary variable for switch cases */
952 bool error_emitted
= false;
955 loc
= this->get_location();
957 switch (this->oper
) {
959 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
960 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
962 result
= do_assignment(instructions
, state
, op
[0], op
[1], false,
963 this->subexpressions
[0]->get_location());
964 error_emitted
= result
->type
->is_error();
969 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
971 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
973 error_emitted
= type
->is_error();
979 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
981 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
983 error_emitted
= type
->is_error();
985 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
993 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
994 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
996 type
= arithmetic_result_type(op
[0], op
[1],
997 (this->oper
== ast_mul
),
999 error_emitted
= type
->is_error();
1001 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1006 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1007 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1009 type
= modulus_result_type(op
[0]->type
, op
[1]->type
, state
, & loc
);
1011 assert(operations
[this->oper
] == ir_binop_mod
);
1013 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1015 error_emitted
= type
->is_error();
1020 if (state
->language_version
< 130) {
1021 _mesa_glsl_error(&loc
, state
, "operator %s requires GLSL 1.30",
1022 operator_string(this->oper
));
1023 error_emitted
= true;
1026 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1027 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1028 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1030 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1032 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1039 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1040 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1042 type
= relational_result_type(op
[0], op
[1], state
, & loc
);
1044 /* The relational operators must either generate an error or result
1045 * in a scalar boolean. See page 57 of the GLSL 1.50 spec.
1047 assert(type
->is_error()
1048 || ((type
->base_type
== GLSL_TYPE_BOOL
)
1049 && type
->is_scalar()));
1051 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1053 error_emitted
= type
->is_error();
1058 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1059 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1061 /* From page 58 (page 64 of the PDF) of the GLSL 1.50 spec:
1063 * "The equality operators equal (==), and not equal (!=)
1064 * operate on all types. They result in a scalar Boolean. If
1065 * the operand types do not match, then there must be a
1066 * conversion from Section 4.1.10 "Implicit Conversions"
1067 * applied to one operand that can make them match, in which
1068 * case this conversion is done."
1070 if ((!apply_implicit_conversion(op
[0]->type
, op
[1], state
)
1071 && !apply_implicit_conversion(op
[1]->type
, op
[0], state
))
1072 || (op
[0]->type
!= op
[1]->type
)) {
1073 _mesa_glsl_error(& loc
, state
, "operands of `%s' must have the same "
1074 "type", (this->oper
== ast_equal
) ? "==" : "!=");
1075 error_emitted
= true;
1076 } else if ((state
->language_version
<= 110)
1077 && (op
[0]->type
->is_array() || op
[1]->type
->is_array())) {
1078 _mesa_glsl_error(& loc
, state
, "array comparisons forbidden in "
1080 error_emitted
= true;
1083 if (error_emitted
) {
1084 result
= new(ctx
) ir_constant(false);
1086 result
= do_comparison(ctx
, operations
[this->oper
], op
[0], op
[1]);
1087 assert(result
->type
== glsl_type::bool_type
);
1094 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1095 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1096 type
= bit_logic_result_type(op
[0]->type
, op
[1]->type
, this->oper
,
1098 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1100 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1104 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1106 if (state
->language_version
< 130) {
1107 _mesa_glsl_error(&loc
, state
, "bit-wise operations require GLSL 1.30");
1108 error_emitted
= true;
1111 if (!op
[0]->type
->is_integer()) {
1112 _mesa_glsl_error(&loc
, state
, "operand of `~' must be an integer");
1113 error_emitted
= true;
1117 result
= new(ctx
) ir_expression(ir_unop_bit_not
, type
, op
[0], NULL
);
1120 case ast_logic_and
: {
1121 exec_list rhs_instructions
;
1122 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1123 "LHS", &error_emitted
);
1124 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1125 "RHS", &error_emitted
);
1127 ir_constant
*op0_const
= op
[0]->constant_expression_value();
1129 if (op0_const
->value
.b
[0]) {
1130 instructions
->append_list(&rhs_instructions
);
1135 type
= glsl_type::bool_type
;
1137 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1140 instructions
->push_tail(tmp
);
1142 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1143 instructions
->push_tail(stmt
);
1145 stmt
->then_instructions
.append_list(&rhs_instructions
);
1146 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1147 ir_assignment
*const then_assign
=
1148 new(ctx
) ir_assignment(then_deref
, op
[1], NULL
);
1149 stmt
->then_instructions
.push_tail(then_assign
);
1151 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1152 ir_assignment
*const else_assign
=
1153 new(ctx
) ir_assignment(else_deref
, new(ctx
) ir_constant(false), NULL
);
1154 stmt
->else_instructions
.push_tail(else_assign
);
1156 result
= new(ctx
) ir_dereference_variable(tmp
);
1162 case ast_logic_or
: {
1163 exec_list rhs_instructions
;
1164 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1165 "LHS", &error_emitted
);
1166 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1167 "RHS", &error_emitted
);
1169 ir_constant
*op0_const
= op
[0]->constant_expression_value();
1171 if (op0_const
->value
.b
[0]) {
1176 type
= glsl_type::bool_type
;
1178 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1181 instructions
->push_tail(tmp
);
1183 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1184 instructions
->push_tail(stmt
);
1186 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1187 ir_assignment
*const then_assign
=
1188 new(ctx
) ir_assignment(then_deref
, new(ctx
) ir_constant(true), NULL
);
1189 stmt
->then_instructions
.push_tail(then_assign
);
1191 stmt
->else_instructions
.append_list(&rhs_instructions
);
1192 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1193 ir_assignment
*const else_assign
=
1194 new(ctx
) ir_assignment(else_deref
, op
[1], NULL
);
1195 stmt
->else_instructions
.push_tail(else_assign
);
1197 result
= new(ctx
) ir_dereference_variable(tmp
);
1204 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1206 * "The logical binary operators and (&&), or ( | | ), and
1207 * exclusive or (^^). They operate only on two Boolean
1208 * expressions and result in a Boolean expression."
1210 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0, "LHS",
1212 op
[1] = get_scalar_boolean_operand(instructions
, state
, this, 1, "RHS",
1215 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1220 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1221 "operand", &error_emitted
);
1223 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1227 case ast_mul_assign
:
1228 case ast_div_assign
:
1229 case ast_add_assign
:
1230 case ast_sub_assign
: {
1231 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1232 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1234 type
= arithmetic_result_type(op
[0], op
[1],
1235 (this->oper
== ast_mul_assign
),
1238 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1241 result
= do_assignment(instructions
, state
,
1242 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1243 this->subexpressions
[0]->get_location());
1244 error_emitted
= (op
[0]->type
->is_error());
1246 /* GLSL 1.10 does not allow array assignment. However, we don't have to
1247 * explicitly test for this because none of the binary expression
1248 * operators allow array operands either.
1254 case ast_mod_assign
: {
1255 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1256 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1258 type
= modulus_result_type(op
[0]->type
, op
[1]->type
, state
, & loc
);
1260 assert(operations
[this->oper
] == ir_binop_mod
);
1262 ir_rvalue
*temp_rhs
;
1263 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1266 result
= do_assignment(instructions
, state
,
1267 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1268 this->subexpressions
[0]->get_location());
1269 error_emitted
= type
->is_error();
1274 case ast_rs_assign
: {
1275 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1276 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1277 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1279 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1280 type
, op
[0], op
[1]);
1281 result
= do_assignment(instructions
, state
, op
[0]->clone(ctx
, NULL
),
1283 this->subexpressions
[0]->get_location());
1284 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1288 case ast_and_assign
:
1289 case ast_xor_assign
:
1290 case ast_or_assign
: {
1291 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1292 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1293 type
= bit_logic_result_type(op
[0]->type
, op
[1]->type
, this->oper
,
1295 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1296 type
, op
[0], op
[1]);
1297 result
= do_assignment(instructions
, state
, op
[0]->clone(ctx
, NULL
),
1299 this->subexpressions
[0]->get_location());
1300 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1304 case ast_conditional
: {
1305 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1307 * "The ternary selection operator (?:). It operates on three
1308 * expressions (exp1 ? exp2 : exp3). This operator evaluates the
1309 * first expression, which must result in a scalar Boolean."
1311 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1312 "condition", &error_emitted
);
1314 /* The :? operator is implemented by generating an anonymous temporary
1315 * followed by an if-statement. The last instruction in each branch of
1316 * the if-statement assigns a value to the anonymous temporary. This
1317 * temporary is the r-value of the expression.
1319 exec_list then_instructions
;
1320 exec_list else_instructions
;
1322 op
[1] = this->subexpressions
[1]->hir(&then_instructions
, state
);
1323 op
[2] = this->subexpressions
[2]->hir(&else_instructions
, state
);
1325 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1327 * "The second and third expressions can be any type, as
1328 * long their types match, or there is a conversion in
1329 * Section 4.1.10 "Implicit Conversions" that can be applied
1330 * to one of the expressions to make their types match. This
1331 * resulting matching type is the type of the entire
1334 if ((!apply_implicit_conversion(op
[1]->type
, op
[2], state
)
1335 && !apply_implicit_conversion(op
[2]->type
, op
[1], state
))
1336 || (op
[1]->type
!= op
[2]->type
)) {
1337 YYLTYPE loc
= this->subexpressions
[1]->get_location();
1339 _mesa_glsl_error(& loc
, state
, "Second and third operands of ?: "
1340 "operator must have matching types.");
1341 error_emitted
= true;
1342 type
= glsl_type::error_type
;
1347 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1349 * "The second and third expressions must be the same type, but can
1350 * be of any type other than an array."
1352 if ((state
->language_version
<= 110) && type
->is_array()) {
1353 _mesa_glsl_error(& loc
, state
, "Second and third operands of ?: "
1354 "operator must not be arrays.");
1355 error_emitted
= true;
1358 ir_constant
*cond_val
= op
[0]->constant_expression_value();
1359 ir_constant
*then_val
= op
[1]->constant_expression_value();
1360 ir_constant
*else_val
= op
[2]->constant_expression_value();
1362 if (then_instructions
.is_empty()
1363 && else_instructions
.is_empty()
1364 && (cond_val
!= NULL
) && (then_val
!= NULL
) && (else_val
!= NULL
)) {
1365 result
= (cond_val
->value
.b
[0]) ? then_val
: else_val
;
1367 ir_variable
*const tmp
=
1368 new(ctx
) ir_variable(type
, "conditional_tmp", ir_var_temporary
);
1369 instructions
->push_tail(tmp
);
1371 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1372 instructions
->push_tail(stmt
);
1374 then_instructions
.move_nodes_to(& stmt
->then_instructions
);
1375 ir_dereference
*const then_deref
=
1376 new(ctx
) ir_dereference_variable(tmp
);
1377 ir_assignment
*const then_assign
=
1378 new(ctx
) ir_assignment(then_deref
, op
[1], NULL
);
1379 stmt
->then_instructions
.push_tail(then_assign
);
1381 else_instructions
.move_nodes_to(& stmt
->else_instructions
);
1382 ir_dereference
*const else_deref
=
1383 new(ctx
) ir_dereference_variable(tmp
);
1384 ir_assignment
*const else_assign
=
1385 new(ctx
) ir_assignment(else_deref
, op
[2], NULL
);
1386 stmt
->else_instructions
.push_tail(else_assign
);
1388 result
= new(ctx
) ir_dereference_variable(tmp
);
1395 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1396 if (op
[0]->type
->base_type
== GLSL_TYPE_FLOAT
)
1397 op
[1] = new(ctx
) ir_constant(1.0f
);
1399 op
[1] = new(ctx
) ir_constant(1);
1401 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1403 ir_rvalue
*temp_rhs
;
1404 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1407 result
= do_assignment(instructions
, state
,
1408 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1409 this->subexpressions
[0]->get_location());
1410 error_emitted
= op
[0]->type
->is_error();
1415 case ast_post_dec
: {
1416 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1417 if (op
[0]->type
->base_type
== GLSL_TYPE_FLOAT
)
1418 op
[1] = new(ctx
) ir_constant(1.0f
);
1420 op
[1] = new(ctx
) ir_constant(1);
1422 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1424 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1426 ir_rvalue
*temp_rhs
;
1427 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1430 /* Get a temporary of a copy of the lvalue before it's modified.
1431 * This may get thrown away later.
1433 result
= get_lvalue_copy(instructions
, op
[0]->clone(ctx
, NULL
));
1435 (void)do_assignment(instructions
, state
,
1436 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1437 this->subexpressions
[0]->get_location());
1439 error_emitted
= op
[0]->type
->is_error();
1443 case ast_field_selection
:
1444 result
= _mesa_ast_field_selection_to_hir(this, instructions
, state
);
1447 case ast_array_index
: {
1448 YYLTYPE index_loc
= subexpressions
[1]->get_location();
1450 op
[0] = subexpressions
[0]->hir(instructions
, state
);
1451 op
[1] = subexpressions
[1]->hir(instructions
, state
);
1453 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1455 ir_rvalue
*const array
= op
[0];
1457 result
= new(ctx
) ir_dereference_array(op
[0], op
[1]);
1459 /* Do not use op[0] after this point. Use array.
1467 if (!array
->type
->is_array()
1468 && !array
->type
->is_matrix()
1469 && !array
->type
->is_vector()) {
1470 _mesa_glsl_error(& index_loc
, state
,
1471 "cannot dereference non-array / non-matrix / "
1473 error_emitted
= true;
1476 if (!op
[1]->type
->is_integer()) {
1477 _mesa_glsl_error(& index_loc
, state
,
1478 "array index must be integer type");
1479 error_emitted
= true;
1480 } else if (!op
[1]->type
->is_scalar()) {
1481 _mesa_glsl_error(& index_loc
, state
,
1482 "array index must be scalar");
1483 error_emitted
= true;
1486 /* If the array index is a constant expression and the array has a
1487 * declared size, ensure that the access is in-bounds. If the array
1488 * index is not a constant expression, ensure that the array has a
1491 ir_constant
*const const_index
= op
[1]->constant_expression_value();
1492 if (const_index
!= NULL
) {
1493 const int idx
= const_index
->value
.i
[0];
1494 const char *type_name
;
1497 if (array
->type
->is_matrix()) {
1498 type_name
= "matrix";
1499 } else if (array
->type
->is_vector()) {
1500 type_name
= "vector";
1502 type_name
= "array";
1505 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec:
1507 * "It is illegal to declare an array with a size, and then
1508 * later (in the same shader) index the same array with an
1509 * integral constant expression greater than or equal to the
1510 * declared size. It is also illegal to index an array with a
1511 * negative constant expression."
1513 if (array
->type
->is_matrix()) {
1514 if (array
->type
->row_type()->vector_elements
<= idx
) {
1515 bound
= array
->type
->row_type()->vector_elements
;
1517 } else if (array
->type
->is_vector()) {
1518 if (array
->type
->vector_elements
<= idx
) {
1519 bound
= array
->type
->vector_elements
;
1522 if ((array
->type
->array_size() > 0)
1523 && (array
->type
->array_size() <= idx
)) {
1524 bound
= array
->type
->array_size();
1529 _mesa_glsl_error(& loc
, state
, "%s index must be < %u",
1531 error_emitted
= true;
1532 } else if (idx
< 0) {
1533 _mesa_glsl_error(& loc
, state
, "%s index must be >= 0",
1535 error_emitted
= true;
1538 if (array
->type
->is_array()) {
1539 /* If the array is a variable dereference, it dereferences the
1540 * whole array, by definition. Use this to get the variable.
1542 * FINISHME: Should some methods for getting / setting / testing
1543 * FINISHME: array access limits be added to ir_dereference?
1545 ir_variable
*const v
= array
->whole_variable_referenced();
1546 if ((v
!= NULL
) && (unsigned(idx
) > v
->max_array_access
))
1547 v
->max_array_access
= idx
;
1549 } else if (array
->type
->array_size() == 0) {
1550 _mesa_glsl_error(&loc
, state
, "unsized array index must be constant");
1552 if (array
->type
->is_array()) {
1553 /* whole_variable_referenced can return NULL if the array is a
1554 * member of a structure. In this case it is safe to not update
1555 * the max_array_access field because it is never used for fields
1558 ir_variable
*v
= array
->whole_variable_referenced();
1560 v
->max_array_access
= array
->type
->array_size() - 1;
1564 /* From page 23 (29 of the PDF) of the GLSL 1.30 spec:
1566 * "Samplers aggregated into arrays within a shader (using square
1567 * brackets [ ]) can only be indexed with integral constant
1568 * expressions [...]."
1570 * This restriction was added in GLSL 1.30. Shaders using earlier version
1571 * of the language should not be rejected by the compiler front-end for
1572 * using this construct. This allows useful things such as using a loop
1573 * counter as the index to an array of samplers. If the loop in unrolled,
1574 * the code should compile correctly. Instead, emit a warning.
1576 if (array
->type
->is_array() &&
1577 array
->type
->element_type()->is_sampler() &&
1578 const_index
== NULL
) {
1580 if (state
->language_version
== 100) {
1581 _mesa_glsl_warning(&loc
, state
,
1582 "sampler arrays indexed with non-constant "
1583 "expressions is optional in GLSL ES 1.00");
1584 } else if (state
->language_version
< 130) {
1585 _mesa_glsl_warning(&loc
, state
,
1586 "sampler arrays indexed with non-constant "
1587 "expressions is forbidden in GLSL 1.30 and "
1590 _mesa_glsl_error(&loc
, state
,
1591 "sampler arrays indexed with non-constant "
1592 "expressions is forbidden in GLSL 1.30 and "
1594 error_emitted
= true;
1599 result
->type
= glsl_type::error_type
;
1604 case ast_function_call
:
1605 /* Should *NEVER* get here. ast_function_call should always be handled
1606 * by ast_function_expression::hir.
1611 case ast_identifier
: {
1612 /* ast_identifier can appear several places in a full abstract syntax
1613 * tree. This particular use must be at location specified in the grammar
1614 * as 'variable_identifier'.
1617 state
->symbols
->get_variable(this->primary_expression
.identifier
);
1619 result
= new(ctx
) ir_dereference_variable(var
);
1624 _mesa_glsl_error(& loc
, state
, "`%s' undeclared",
1625 this->primary_expression
.identifier
);
1627 error_emitted
= true;
1632 case ast_int_constant
:
1633 result
= new(ctx
) ir_constant(this->primary_expression
.int_constant
);
1636 case ast_uint_constant
:
1637 result
= new(ctx
) ir_constant(this->primary_expression
.uint_constant
);
1640 case ast_float_constant
:
1641 result
= new(ctx
) ir_constant(this->primary_expression
.float_constant
);
1644 case ast_bool_constant
:
1645 result
= new(ctx
) ir_constant(bool(this->primary_expression
.bool_constant
));
1648 case ast_sequence
: {
1649 /* It should not be possible to generate a sequence in the AST without
1650 * any expressions in it.
1652 assert(!this->expressions
.is_empty());
1654 /* The r-value of a sequence is the last expression in the sequence. If
1655 * the other expressions in the sequence do not have side-effects (and
1656 * therefore add instructions to the instruction list), they get dropped
1659 exec_node
*previous_tail_pred
= NULL
;
1660 YYLTYPE previous_operand_loc
= loc
;
1662 foreach_list_typed (ast_node
, ast
, link
, &this->expressions
) {
1663 /* If one of the operands of comma operator does not generate any
1664 * code, we want to emit a warning. At each pass through the loop
1665 * previous_tail_pred will point to the last instruction in the
1666 * stream *before* processing the previous operand. Naturally,
1667 * instructions->tail_pred will point to the last instruction in the
1668 * stream *after* processing the previous operand. If the two
1669 * pointers match, then the previous operand had no effect.
1671 * The warning behavior here differs slightly from GCC. GCC will
1672 * only emit a warning if none of the left-hand operands have an
1673 * effect. However, it will emit a warning for each. I believe that
1674 * there are some cases in C (especially with GCC extensions) where
1675 * it is useful to have an intermediate step in a sequence have no
1676 * effect, but I don't think these cases exist in GLSL. Either way,
1677 * it would be a giant hassle to replicate that behavior.
1679 if (previous_tail_pred
== instructions
->tail_pred
) {
1680 _mesa_glsl_warning(&previous_operand_loc
, state
,
1681 "left-hand operand of comma expression has "
1685 /* tail_pred is directly accessed instead of using the get_tail()
1686 * method for performance reasons. get_tail() has extra code to
1687 * return NULL when the list is empty. We don't care about that
1688 * here, so using tail_pred directly is fine.
1690 previous_tail_pred
= instructions
->tail_pred
;
1691 previous_operand_loc
= ast
->get_location();
1693 result
= ast
->hir(instructions
, state
);
1696 /* Any errors should have already been emitted in the loop above.
1698 error_emitted
= true;
1702 type
= NULL
; /* use result->type, not type. */
1703 assert(result
!= NULL
);
1705 if (result
->type
->is_error() && !error_emitted
)
1706 _mesa_glsl_error(& loc
, state
, "type mismatch");
1713 ast_expression_statement::hir(exec_list
*instructions
,
1714 struct _mesa_glsl_parse_state
*state
)
1716 /* It is possible to have expression statements that don't have an
1717 * expression. This is the solitary semicolon:
1719 * for (i = 0; i < 5; i++)
1722 * In this case the expression will be NULL. Test for NULL and don't do
1723 * anything in that case.
1725 if (expression
!= NULL
)
1726 expression
->hir(instructions
, state
);
1728 /* Statements do not have r-values.
1735 ast_compound_statement::hir(exec_list
*instructions
,
1736 struct _mesa_glsl_parse_state
*state
)
1739 state
->symbols
->push_scope();
1741 foreach_list_typed (ast_node
, ast
, link
, &this->statements
)
1742 ast
->hir(instructions
, state
);
1745 state
->symbols
->pop_scope();
1747 /* Compound statements do not have r-values.
1753 static const glsl_type
*
1754 process_array_type(YYLTYPE
*loc
, const glsl_type
*base
, ast_node
*array_size
,
1755 struct _mesa_glsl_parse_state
*state
)
1757 unsigned length
= 0;
1759 /* FINISHME: Reject delcarations of multidimensional arrays. */
1761 if (array_size
!= NULL
) {
1762 exec_list dummy_instructions
;
1763 ir_rvalue
*const ir
= array_size
->hir(& dummy_instructions
, state
);
1764 YYLTYPE loc
= array_size
->get_location();
1766 /* FINISHME: Verify that the grammar forbids side-effects in array
1767 * FINISHME: sizes. i.e., 'vec4 [x = 12] data'
1769 assert(dummy_instructions
.is_empty());
1772 if (!ir
->type
->is_integer()) {
1773 _mesa_glsl_error(& loc
, state
, "array size must be integer type");
1774 } else if (!ir
->type
->is_scalar()) {
1775 _mesa_glsl_error(& loc
, state
, "array size must be scalar type");
1777 ir_constant
*const size
= ir
->constant_expression_value();
1780 _mesa_glsl_error(& loc
, state
, "array size must be a "
1781 "constant valued expression");
1782 } else if (size
->value
.i
[0] <= 0) {
1783 _mesa_glsl_error(& loc
, state
, "array size must be > 0");
1785 assert(size
->type
== ir
->type
);
1786 length
= size
->value
.u
[0];
1790 } else if (state
->es_shader
) {
1791 /* Section 10.17 of the GLSL ES 1.00 specification states that unsized
1792 * array declarations have been removed from the language.
1794 _mesa_glsl_error(loc
, state
, "unsized array declarations are not "
1795 "allowed in GLSL ES 1.00.");
1798 return glsl_type::get_array_instance(base
, length
);
1803 ast_type_specifier::glsl_type(const char **name
,
1804 struct _mesa_glsl_parse_state
*state
) const
1806 const struct glsl_type
*type
;
1808 type
= state
->symbols
->get_type(this->type_name
);
1809 *name
= this->type_name
;
1811 if (this->is_array
) {
1812 YYLTYPE loc
= this->get_location();
1813 type
= process_array_type(&loc
, type
, this->array_size
, state
);
1821 apply_type_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
1823 struct _mesa_glsl_parse_state
*state
,
1826 if (qual
->flags
.q
.invariant
) {
1828 _mesa_glsl_error(loc
, state
,
1829 "variable `%s' may not be redeclared "
1830 "`invariant' after being used",
1837 if (qual
->flags
.q
.constant
|| qual
->flags
.q
.attribute
1838 || qual
->flags
.q
.uniform
1839 || (qual
->flags
.q
.varying
&& (state
->target
== fragment_shader
)))
1842 if (qual
->flags
.q
.centroid
)
1845 if (qual
->flags
.q
.attribute
&& state
->target
!= vertex_shader
) {
1846 var
->type
= glsl_type::error_type
;
1847 _mesa_glsl_error(loc
, state
,
1848 "`attribute' variables may not be declared in the "
1850 _mesa_glsl_shader_target_name(state
->target
));
1853 /* From page 25 (page 31 of the PDF) of the GLSL 1.10 spec:
1855 * "The varying qualifier can be used only with the data types
1856 * float, vec2, vec3, vec4, mat2, mat3, and mat4, or arrays of
1859 if (qual
->flags
.q
.varying
) {
1860 const glsl_type
*non_array_type
;
1862 if (var
->type
&& var
->type
->is_array())
1863 non_array_type
= var
->type
->fields
.array
;
1865 non_array_type
= var
->type
;
1867 if (non_array_type
&& non_array_type
->base_type
!= GLSL_TYPE_FLOAT
) {
1868 var
->type
= glsl_type::error_type
;
1869 _mesa_glsl_error(loc
, state
,
1870 "varying variables must be of base type float");
1874 /* If there is no qualifier that changes the mode of the variable, leave
1875 * the setting alone.
1877 if (qual
->flags
.q
.in
&& qual
->flags
.q
.out
)
1878 var
->mode
= ir_var_inout
;
1879 else if (qual
->flags
.q
.attribute
|| qual
->flags
.q
.in
1880 || (qual
->flags
.q
.varying
&& (state
->target
== fragment_shader
)))
1881 var
->mode
= ir_var_in
;
1882 else if (qual
->flags
.q
.out
1883 || (qual
->flags
.q
.varying
&& (state
->target
== vertex_shader
)))
1884 var
->mode
= ir_var_out
;
1885 else if (qual
->flags
.q
.uniform
)
1886 var
->mode
= ir_var_uniform
;
1888 if (state
->all_invariant
&& (state
->current_function
== NULL
)) {
1889 switch (state
->target
) {
1891 if (var
->mode
== ir_var_out
)
1892 var
->invariant
= true;
1894 case geometry_shader
:
1895 if ((var
->mode
== ir_var_in
) || (var
->mode
== ir_var_out
))
1896 var
->invariant
= true;
1898 case fragment_shader
:
1899 if (var
->mode
== ir_var_in
)
1900 var
->invariant
= true;
1905 if (qual
->flags
.q
.flat
)
1906 var
->interpolation
= ir_var_flat
;
1907 else if (qual
->flags
.q
.noperspective
)
1908 var
->interpolation
= ir_var_noperspective
;
1910 var
->interpolation
= ir_var_smooth
;
1912 var
->pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
1913 var
->origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
1914 if ((qual
->flags
.q
.origin_upper_left
|| qual
->flags
.q
.pixel_center_integer
)
1915 && (strcmp(var
->name
, "gl_FragCoord") != 0)) {
1916 const char *const qual_string
= (qual
->flags
.q
.origin_upper_left
)
1917 ? "origin_upper_left" : "pixel_center_integer";
1919 _mesa_glsl_error(loc
, state
,
1920 "layout qualifier `%s' can only be applied to "
1921 "fragment shader input `gl_FragCoord'",
1925 if (qual
->flags
.q
.explicit_location
) {
1926 const bool global_scope
= (state
->current_function
== NULL
);
1928 const char *string
= "";
1930 /* In the vertex shader only shader inputs can be given explicit
1933 * In the fragment shader only shader outputs can be given explicit
1936 switch (state
->target
) {
1938 if (!global_scope
|| (var
->mode
!= ir_var_in
)) {
1944 case geometry_shader
:
1945 _mesa_glsl_error(loc
, state
,
1946 "geometry shader variables cannot be given "
1947 "explicit locations\n");
1950 case fragment_shader
:
1951 if (!global_scope
|| (var
->mode
!= ir_var_out
)) {
1959 _mesa_glsl_error(loc
, state
,
1960 "only %s shader %s variables can be given an "
1961 "explicit location\n",
1962 _mesa_glsl_shader_target_name(state
->target
),
1965 var
->explicit_location
= true;
1967 /* This bit of silliness is needed because invalid explicit locations
1968 * are supposed to be flagged during linking. Small negative values
1969 * biased by VERT_ATTRIB_GENERIC0 or FRAG_RESULT_DATA0 could alias
1970 * built-in values (e.g., -16+VERT_ATTRIB_GENERIC0 = VERT_ATTRIB_POS).
1971 * The linker needs to be able to differentiate these cases. This
1972 * ensures that negative values stay negative.
1974 if (qual
->location
>= 0) {
1975 var
->location
= (state
->target
== vertex_shader
)
1976 ? (qual
->location
+ VERT_ATTRIB_GENERIC0
)
1977 : (qual
->location
+ FRAG_RESULT_DATA0
);
1979 var
->location
= qual
->location
;
1984 /* Does the declaration use the 'layout' keyword?
1986 const bool uses_layout
= qual
->flags
.q
.pixel_center_integer
1987 || qual
->flags
.q
.origin_upper_left
1988 || qual
->flags
.q
.explicit_location
;
1990 /* Does the declaration use the deprecated 'attribute' or 'varying'
1993 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
1994 || qual
->flags
.q
.varying
;
1996 /* Is the 'layout' keyword used with parameters that allow relaxed checking.
1997 * Many implementations of GL_ARB_fragment_coord_conventions_enable and some
1998 * implementations (only Mesa?) GL_ARB_explicit_attrib_location_enable
1999 * allowed the layout qualifier to be used with 'varying' and 'attribute'.
2000 * These extensions and all following extensions that add the 'layout'
2001 * keyword have been modified to require the use of 'in' or 'out'.
2003 * The following extension do not allow the deprecated keywords:
2005 * GL_AMD_conservative_depth
2006 * GL_ARB_gpu_shader5
2007 * GL_ARB_separate_shader_objects
2008 * GL_ARB_tesselation_shader
2009 * GL_ARB_transform_feedback3
2010 * GL_ARB_uniform_buffer_object
2012 * It is unknown whether GL_EXT_shader_image_load_store or GL_NV_gpu_shader5
2013 * allow layout with the deprecated keywords.
2015 const bool relaxed_layout_qualifier_checking
=
2016 state
->ARB_fragment_coord_conventions_enable
;
2018 if (uses_layout
&& uses_deprecated_qualifier
) {
2019 if (relaxed_layout_qualifier_checking
) {
2020 _mesa_glsl_warning(loc
, state
,
2021 "`layout' qualifier may not be used with "
2022 "`attribute' or `varying'");
2024 _mesa_glsl_error(loc
, state
,
2025 "`layout' qualifier may not be used with "
2026 "`attribute' or `varying'");
2030 /* Layout qualifiers for gl_FragDepth, which are enabled by extension
2031 * AMD_conservative_depth.
2033 int depth_layout_count
= qual
->flags
.q
.depth_any
2034 + qual
->flags
.q
.depth_greater
2035 + qual
->flags
.q
.depth_less
2036 + qual
->flags
.q
.depth_unchanged
;
2037 if (depth_layout_count
> 0
2038 && !state
->AMD_conservative_depth_enable
) {
2039 _mesa_glsl_error(loc
, state
,
2040 "extension GL_AMD_conservative_depth must be enabled "
2041 "to use depth layout qualifiers");
2042 } else if (depth_layout_count
> 0
2043 && strcmp(var
->name
, "gl_FragDepth") != 0) {
2044 _mesa_glsl_error(loc
, state
,
2045 "depth layout qualifiers can be applied only to "
2047 } else if (depth_layout_count
> 1
2048 && strcmp(var
->name
, "gl_FragDepth") == 0) {
2049 _mesa_glsl_error(loc
, state
,
2050 "at most one depth layout qualifier can be applied to "
2053 if (qual
->flags
.q
.depth_any
)
2054 var
->depth_layout
= ir_depth_layout_any
;
2055 else if (qual
->flags
.q
.depth_greater
)
2056 var
->depth_layout
= ir_depth_layout_greater
;
2057 else if (qual
->flags
.q
.depth_less
)
2058 var
->depth_layout
= ir_depth_layout_less
;
2059 else if (qual
->flags
.q
.depth_unchanged
)
2060 var
->depth_layout
= ir_depth_layout_unchanged
;
2062 var
->depth_layout
= ir_depth_layout_none
;
2064 if (var
->type
->is_array() && state
->language_version
!= 110) {
2065 var
->array_lvalue
= true;
2070 * Get the variable that is being redeclared by this declaration
2072 * Semantic checks to verify the validity of the redeclaration are also
2073 * performed. If semantic checks fail, compilation error will be emitted via
2074 * \c _mesa_glsl_error, but a non-\c NULL pointer will still be returned.
2077 * A pointer to an existing variable in the current scope if the declaration
2078 * is a redeclaration, \c NULL otherwise.
2081 get_variable_being_redeclared(ir_variable
*var
, ast_declaration
*decl
,
2082 struct _mesa_glsl_parse_state
*state
)
2084 /* Check if this declaration is actually a re-declaration, either to
2085 * resize an array or add qualifiers to an existing variable.
2087 * This is allowed for variables in the current scope, or when at
2088 * global scope (for built-ins in the implicit outer scope).
2090 ir_variable
*earlier
= state
->symbols
->get_variable(decl
->identifier
);
2091 if (earlier
== NULL
||
2092 (state
->current_function
!= NULL
&&
2093 !state
->symbols
->name_declared_this_scope(decl
->identifier
))) {
2098 YYLTYPE loc
= decl
->get_location();
2100 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec,
2102 * "It is legal to declare an array without a size and then
2103 * later re-declare the same name as an array of the same
2104 * type and specify a size."
2106 if ((earlier
->type
->array_size() == 0)
2107 && var
->type
->is_array()
2108 && (var
->type
->element_type() == earlier
->type
->element_type())) {
2109 /* FINISHME: This doesn't match the qualifiers on the two
2110 * FINISHME: declarations. It's not 100% clear whether this is
2111 * FINISHME: required or not.
2114 /* From page 54 (page 60 of the PDF) of the GLSL 1.20 spec:
2116 * "The size [of gl_TexCoord] can be at most
2117 * gl_MaxTextureCoords."
2119 const unsigned size
= unsigned(var
->type
->array_size());
2120 if ((strcmp("gl_TexCoord", var
->name
) == 0)
2121 && (size
> state
->Const
.MaxTextureCoords
)) {
2122 _mesa_glsl_error(& loc
, state
, "`gl_TexCoord' array size cannot "
2123 "be larger than gl_MaxTextureCoords (%u)\n",
2124 state
->Const
.MaxTextureCoords
);
2125 } else if ((size
> 0) && (size
<= earlier
->max_array_access
)) {
2126 _mesa_glsl_error(& loc
, state
, "array size must be > %u due to "
2128 earlier
->max_array_access
);
2131 earlier
->type
= var
->type
;
2134 } else if (state
->ARB_fragment_coord_conventions_enable
2135 && strcmp(var
->name
, "gl_FragCoord") == 0
2136 && earlier
->type
== var
->type
2137 && earlier
->mode
== var
->mode
) {
2138 /* Allow redeclaration of gl_FragCoord for ARB_fcc layout
2141 earlier
->origin_upper_left
= var
->origin_upper_left
;
2142 earlier
->pixel_center_integer
= var
->pixel_center_integer
;
2144 /* According to section 4.3.7 of the GLSL 1.30 spec,
2145 * the following built-in varaibles can be redeclared with an
2146 * interpolation qualifier:
2149 * * gl_FrontSecondaryColor
2150 * * gl_BackSecondaryColor
2152 * * gl_SecondaryColor
2154 } else if (state
->language_version
>= 130
2155 && (strcmp(var
->name
, "gl_FrontColor") == 0
2156 || strcmp(var
->name
, "gl_BackColor") == 0
2157 || strcmp(var
->name
, "gl_FrontSecondaryColor") == 0
2158 || strcmp(var
->name
, "gl_BackSecondaryColor") == 0
2159 || strcmp(var
->name
, "gl_Color") == 0
2160 || strcmp(var
->name
, "gl_SecondaryColor") == 0)
2161 && earlier
->type
== var
->type
2162 && earlier
->mode
== var
->mode
) {
2163 earlier
->interpolation
= var
->interpolation
;
2165 /* Layout qualifiers for gl_FragDepth. */
2166 } else if (state
->AMD_conservative_depth_enable
2167 && strcmp(var
->name
, "gl_FragDepth") == 0
2168 && earlier
->type
== var
->type
2169 && earlier
->mode
== var
->mode
) {
2171 /** From the AMD_conservative_depth spec:
2172 * Within any shader, the first redeclarations of gl_FragDepth
2173 * must appear before any use of gl_FragDepth.
2175 if (earlier
->used
) {
2176 _mesa_glsl_error(&loc
, state
,
2177 "the first redeclaration of gl_FragDepth "
2178 "must appear before any use of gl_FragDepth");
2181 /* Prevent inconsistent redeclaration of depth layout qualifier. */
2182 if (earlier
->depth_layout
!= ir_depth_layout_none
2183 && earlier
->depth_layout
!= var
->depth_layout
) {
2184 _mesa_glsl_error(&loc
, state
,
2185 "gl_FragDepth: depth layout is declared here "
2186 "as '%s, but it was previously declared as "
2188 depth_layout_string(var
->depth_layout
),
2189 depth_layout_string(earlier
->depth_layout
));
2192 earlier
->depth_layout
= var
->depth_layout
;
2195 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", decl
->identifier
);
2202 * Generate the IR for an initializer in a variable declaration
2205 process_initializer(ir_variable
*var
, ast_declaration
*decl
,
2206 ast_fully_specified_type
*type
,
2207 exec_list
*initializer_instructions
,
2208 struct _mesa_glsl_parse_state
*state
)
2210 ir_rvalue
*result
= NULL
;
2212 YYLTYPE initializer_loc
= decl
->initializer
->get_location();
2214 /* From page 24 (page 30 of the PDF) of the GLSL 1.10 spec:
2216 * "All uniform variables are read-only and are initialized either
2217 * directly by an application via API commands, or indirectly by
2220 if ((state
->language_version
<= 110)
2221 && (var
->mode
== ir_var_uniform
)) {
2222 _mesa_glsl_error(& initializer_loc
, state
,
2223 "cannot initialize uniforms in GLSL 1.10");
2226 if (var
->type
->is_sampler()) {
2227 _mesa_glsl_error(& initializer_loc
, state
,
2228 "cannot initialize samplers");
2231 if ((var
->mode
== ir_var_in
) && (state
->current_function
== NULL
)) {
2232 _mesa_glsl_error(& initializer_loc
, state
,
2233 "cannot initialize %s shader input / %s",
2234 _mesa_glsl_shader_target_name(state
->target
),
2235 (state
->target
== vertex_shader
)
2236 ? "attribute" : "varying");
2239 ir_dereference
*const lhs
= new(state
) ir_dereference_variable(var
);
2240 ir_rvalue
*rhs
= decl
->initializer
->hir(initializer_instructions
,
2243 /* Calculate the constant value if this is a const or uniform
2246 if (type
->qualifier
.flags
.q
.constant
2247 || type
->qualifier
.flags
.q
.uniform
) {
2248 ir_rvalue
*new_rhs
= validate_assignment(state
, var
->type
, rhs
, true);
2249 if (new_rhs
!= NULL
) {
2252 ir_constant
*constant_value
= rhs
->constant_expression_value();
2253 if (!constant_value
) {
2254 _mesa_glsl_error(& initializer_loc
, state
,
2255 "initializer of %s variable `%s' must be a "
2256 "constant expression",
2257 (type
->qualifier
.flags
.q
.constant
)
2258 ? "const" : "uniform",
2260 if (var
->type
->is_numeric()) {
2261 /* Reduce cascading errors. */
2262 var
->constant_value
= ir_constant::zero(state
, var
->type
);
2265 rhs
= constant_value
;
2266 var
->constant_value
= constant_value
;
2269 _mesa_glsl_error(&initializer_loc
, state
,
2270 "initializer of type %s cannot be assigned to "
2271 "variable of type %s",
2272 rhs
->type
->name
, var
->type
->name
);
2273 if (var
->type
->is_numeric()) {
2274 /* Reduce cascading errors. */
2275 var
->constant_value
= ir_constant::zero(state
, var
->type
);
2280 if (rhs
&& !rhs
->type
->is_error()) {
2281 bool temp
= var
->read_only
;
2282 if (type
->qualifier
.flags
.q
.constant
)
2283 var
->read_only
= false;
2285 /* Never emit code to initialize a uniform.
2287 const glsl_type
*initializer_type
;
2288 if (!type
->qualifier
.flags
.q
.uniform
) {
2289 result
= do_assignment(initializer_instructions
, state
,
2291 type
->get_location());
2292 initializer_type
= result
->type
;
2294 initializer_type
= rhs
->type
;
2296 /* If the declared variable is an unsized array, it must inherrit
2297 * its full type from the initializer. A declaration such as
2299 * uniform float a[] = float[](1.0, 2.0, 3.0, 3.0);
2303 * uniform float a[4] = float[](1.0, 2.0, 3.0, 3.0);
2305 * The assignment generated in the if-statement (below) will also
2306 * automatically handle this case for non-uniforms.
2308 * If the declared variable is not an array, the types must
2309 * already match exactly. As a result, the type assignment
2310 * here can be done unconditionally. For non-uniforms the call
2311 * to do_assignment can change the type of the initializer (via
2312 * the implicit conversion rules). For uniforms the initializer
2313 * must be a constant expression, and the type of that expression
2314 * was validated above.
2316 var
->type
= initializer_type
;
2318 var
->read_only
= temp
;
2325 ast_declarator_list::hir(exec_list
*instructions
,
2326 struct _mesa_glsl_parse_state
*state
)
2329 const struct glsl_type
*decl_type
;
2330 const char *type_name
= NULL
;
2331 ir_rvalue
*result
= NULL
;
2332 YYLTYPE loc
= this->get_location();
2334 /* From page 46 (page 52 of the PDF) of the GLSL 1.50 spec:
2336 * "To ensure that a particular output variable is invariant, it is
2337 * necessary to use the invariant qualifier. It can either be used to
2338 * qualify a previously declared variable as being invariant
2340 * invariant gl_Position; // make existing gl_Position be invariant"
2342 * In these cases the parser will set the 'invariant' flag in the declarator
2343 * list, and the type will be NULL.
2345 if (this->invariant
) {
2346 assert(this->type
== NULL
);
2348 if (state
->current_function
!= NULL
) {
2349 _mesa_glsl_error(& loc
, state
,
2350 "All uses of `invariant' keyword must be at global "
2354 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
2355 assert(!decl
->is_array
);
2356 assert(decl
->array_size
== NULL
);
2357 assert(decl
->initializer
== NULL
);
2359 ir_variable
*const earlier
=
2360 state
->symbols
->get_variable(decl
->identifier
);
2361 if (earlier
== NULL
) {
2362 _mesa_glsl_error(& loc
, state
,
2363 "Undeclared variable `%s' cannot be marked "
2364 "invariant\n", decl
->identifier
);
2365 } else if ((state
->target
== vertex_shader
)
2366 && (earlier
->mode
!= ir_var_out
)) {
2367 _mesa_glsl_error(& loc
, state
,
2368 "`%s' cannot be marked invariant, vertex shader "
2369 "outputs only\n", decl
->identifier
);
2370 } else if ((state
->target
== fragment_shader
)
2371 && (earlier
->mode
!= ir_var_in
)) {
2372 _mesa_glsl_error(& loc
, state
,
2373 "`%s' cannot be marked invariant, fragment shader "
2374 "inputs only\n", decl
->identifier
);
2375 } else if (earlier
->used
) {
2376 _mesa_glsl_error(& loc
, state
,
2377 "variable `%s' may not be redeclared "
2378 "`invariant' after being used",
2381 earlier
->invariant
= true;
2385 /* Invariant redeclarations do not have r-values.
2390 assert(this->type
!= NULL
);
2391 assert(!this->invariant
);
2393 /* The type specifier may contain a structure definition. Process that
2394 * before any of the variable declarations.
2396 (void) this->type
->specifier
->hir(instructions
, state
);
2398 decl_type
= this->type
->specifier
->glsl_type(& type_name
, state
);
2399 if (this->declarations
.is_empty()) {
2400 /* The only valid case where the declaration list can be empty is when
2401 * the declaration is setting the default precision of a built-in type
2402 * (e.g., 'precision highp vec4;').
2405 if (decl_type
!= NULL
) {
2407 _mesa_glsl_error(& loc
, state
, "incomplete declaration");
2411 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
2412 const struct glsl_type
*var_type
;
2415 /* FINISHME: Emit a warning if a variable declaration shadows a
2416 * FINISHME: declaration at a higher scope.
2419 if ((decl_type
== NULL
) || decl_type
->is_void()) {
2420 if (type_name
!= NULL
) {
2421 _mesa_glsl_error(& loc
, state
,
2422 "invalid type `%s' in declaration of `%s'",
2423 type_name
, decl
->identifier
);
2425 _mesa_glsl_error(& loc
, state
,
2426 "invalid type in declaration of `%s'",
2432 if (decl
->is_array
) {
2433 var_type
= process_array_type(&loc
, decl_type
, decl
->array_size
,
2436 var_type
= decl_type
;
2439 var
= new(ctx
) ir_variable(var_type
, decl
->identifier
, ir_var_auto
);
2441 /* From page 22 (page 28 of the PDF) of the GLSL 1.10 specification;
2443 * "Global variables can only use the qualifiers const,
2444 * attribute, uni form, or varying. Only one may be
2447 * Local variables can only use the qualifier const."
2449 * This is relaxed in GLSL 1.30. It is also relaxed by any extension
2450 * that adds the 'layout' keyword.
2452 if ((state
->language_version
< 130)
2453 && !state
->ARB_explicit_attrib_location_enable
2454 && !state
->ARB_fragment_coord_conventions_enable
) {
2455 if (this->type
->qualifier
.flags
.q
.out
) {
2456 _mesa_glsl_error(& loc
, state
,
2457 "`out' qualifier in declaration of `%s' "
2458 "only valid for function parameters in %s.",
2459 decl
->identifier
, state
->version_string
);
2461 if (this->type
->qualifier
.flags
.q
.in
) {
2462 _mesa_glsl_error(& loc
, state
,
2463 "`in' qualifier in declaration of `%s' "
2464 "only valid for function parameters in %s.",
2465 decl
->identifier
, state
->version_string
);
2467 /* FINISHME: Test for other invalid qualifiers. */
2470 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
,
2473 if (this->type
->qualifier
.flags
.q
.invariant
) {
2474 if ((state
->target
== vertex_shader
) && !(var
->mode
== ir_var_out
||
2475 var
->mode
== ir_var_inout
)) {
2476 /* FINISHME: Note that this doesn't work for invariant on
2477 * a function signature outval
2479 _mesa_glsl_error(& loc
, state
,
2480 "`%s' cannot be marked invariant, vertex shader "
2481 "outputs only\n", var
->name
);
2482 } else if ((state
->target
== fragment_shader
) &&
2483 !(var
->mode
== ir_var_in
|| var
->mode
== ir_var_inout
)) {
2484 /* FINISHME: Note that this doesn't work for invariant on
2485 * a function signature inval
2487 _mesa_glsl_error(& loc
, state
,
2488 "`%s' cannot be marked invariant, fragment shader "
2489 "inputs only\n", var
->name
);
2493 if (state
->current_function
!= NULL
) {
2494 const char *mode
= NULL
;
2495 const char *extra
= "";
2497 /* There is no need to check for 'inout' here because the parser will
2498 * only allow that in function parameter lists.
2500 if (this->type
->qualifier
.flags
.q
.attribute
) {
2502 } else if (this->type
->qualifier
.flags
.q
.uniform
) {
2504 } else if (this->type
->qualifier
.flags
.q
.varying
) {
2506 } else if (this->type
->qualifier
.flags
.q
.in
) {
2508 extra
= " or in function parameter list";
2509 } else if (this->type
->qualifier
.flags
.q
.out
) {
2511 extra
= " or in function parameter list";
2515 _mesa_glsl_error(& loc
, state
,
2516 "%s variable `%s' must be declared at "
2518 mode
, var
->name
, extra
);
2520 } else if (var
->mode
== ir_var_in
) {
2521 var
->read_only
= true;
2523 if (state
->target
== vertex_shader
) {
2524 bool error_emitted
= false;
2526 /* From page 31 (page 37 of the PDF) of the GLSL 1.50 spec:
2528 * "Vertex shader inputs can only be float, floating-point
2529 * vectors, matrices, signed and unsigned integers and integer
2530 * vectors. Vertex shader inputs can also form arrays of these
2531 * types, but not structures."
2533 * From page 31 (page 27 of the PDF) of the GLSL 1.30 spec:
2535 * "Vertex shader inputs can only be float, floating-point
2536 * vectors, matrices, signed and unsigned integers and integer
2537 * vectors. They cannot be arrays or structures."
2539 * From page 23 (page 29 of the PDF) of the GLSL 1.20 spec:
2541 * "The attribute qualifier can be used only with float,
2542 * floating-point vectors, and matrices. Attribute variables
2543 * cannot be declared as arrays or structures."
2545 const glsl_type
*check_type
= var
->type
->is_array()
2546 ? var
->type
->fields
.array
: var
->type
;
2548 switch (check_type
->base_type
) {
2549 case GLSL_TYPE_FLOAT
:
2551 case GLSL_TYPE_UINT
:
2553 if (state
->language_version
> 120)
2557 _mesa_glsl_error(& loc
, state
,
2558 "vertex shader input / attribute cannot have "
2560 var
->type
->is_array() ? "array of " : "",
2562 error_emitted
= true;
2565 if (!error_emitted
&& (state
->language_version
<= 130)
2566 && var
->type
->is_array()) {
2567 _mesa_glsl_error(& loc
, state
,
2568 "vertex shader input / attribute cannot have "
2570 error_emitted
= true;
2575 /* Integer vertex outputs must be qualified with 'flat'.
2577 * From section 4.3.6 of the GLSL 1.30 spec:
2578 * "If a vertex output is a signed or unsigned integer or integer
2579 * vector, then it must be qualified with the interpolation qualifier
2582 if (state
->language_version
>= 130
2583 && state
->target
== vertex_shader
2584 && state
->current_function
== NULL
2585 && var
->type
->is_integer()
2586 && var
->mode
== ir_var_out
2587 && var
->interpolation
!= ir_var_flat
) {
2589 _mesa_glsl_error(&loc
, state
, "If a vertex output is an integer, "
2590 "then it must be qualified with 'flat'");
2594 /* Interpolation qualifiers cannot be applied to 'centroid' and
2595 * 'centroid varying'.
2597 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
2598 * "interpolation qualifiers may only precede the qualifiers in,
2599 * centroid in, out, or centroid out in a declaration. They do not apply
2600 * to the deprecated storage qualifiers varying or centroid varying."
2602 if (state
->language_version
>= 130
2603 && this->type
->qualifier
.has_interpolation()
2604 && this->type
->qualifier
.flags
.q
.varying
) {
2606 const char *i
= this->type
->qualifier
.interpolation_string();
2609 if (this->type
->qualifier
.flags
.q
.centroid
)
2610 s
= "centroid varying";
2614 _mesa_glsl_error(&loc
, state
,
2615 "qualifier '%s' cannot be applied to the "
2616 "deprecated storage qualifier '%s'", i
, s
);
2620 /* Interpolation qualifiers can only apply to vertex shader outputs and
2621 * fragment shader inputs.
2623 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
2624 * "Outputs from a vertex shader (out) and inputs to a fragment
2625 * shader (in) can be further qualified with one or more of these
2626 * interpolation qualifiers"
2628 if (state
->language_version
>= 130
2629 && this->type
->qualifier
.has_interpolation()) {
2631 const char *i
= this->type
->qualifier
.interpolation_string();
2634 switch (state
->target
) {
2636 if (this->type
->qualifier
.flags
.q
.in
) {
2637 _mesa_glsl_error(&loc
, state
,
2638 "qualifier '%s' cannot be applied to vertex "
2639 "shader inputs", i
);
2642 case fragment_shader
:
2643 if (this->type
->qualifier
.flags
.q
.out
) {
2644 _mesa_glsl_error(&loc
, state
,
2645 "qualifier '%s' cannot be applied to fragment "
2646 "shader outputs", i
);
2655 /* From section 4.3.4 of the GLSL 1.30 spec:
2656 * "It is an error to use centroid in in a vertex shader."
2658 if (state
->language_version
>= 130
2659 && this->type
->qualifier
.flags
.q
.centroid
2660 && this->type
->qualifier
.flags
.q
.in
2661 && state
->target
== vertex_shader
) {
2663 _mesa_glsl_error(&loc
, state
,
2664 "'centroid in' cannot be used in a vertex shader");
2668 /* Precision qualifiers exists only in GLSL versions 1.00 and >= 1.30.
2670 if (this->type
->specifier
->precision
!= ast_precision_none
2671 && state
->language_version
!= 100
2672 && state
->language_version
< 130) {
2674 _mesa_glsl_error(&loc
, state
,
2675 "precision qualifiers are supported only in GLSL ES "
2676 "1.00, and GLSL 1.30 and later");
2680 /* Precision qualifiers only apply to floating point and integer types.
2682 * From section 4.5.2 of the GLSL 1.30 spec:
2683 * "Any floating point or any integer declaration can have the type
2684 * preceded by one of these precision qualifiers [...] Literal
2685 * constants do not have precision qualifiers. Neither do Boolean
2688 * In GLSL ES, sampler types are also allowed.
2690 * From page 87 of the GLSL ES spec:
2691 * "RESOLUTION: Allow sampler types to take a precision qualifier."
2693 if (this->type
->specifier
->precision
!= ast_precision_none
2694 && !var
->type
->is_float()
2695 && !var
->type
->is_integer()
2696 && !(var
->type
->is_sampler() && state
->es_shader
)
2697 && !(var
->type
->is_array()
2698 && (var
->type
->fields
.array
->is_float()
2699 || var
->type
->fields
.array
->is_integer()))) {
2701 _mesa_glsl_error(&loc
, state
,
2702 "precision qualifiers apply only to floating point"
2703 "%s types", state
->es_shader
? ", integer, and sampler"
2707 /* Process the initializer and add its instructions to a temporary
2708 * list. This list will be added to the instruction stream (below) after
2709 * the declaration is added. This is done because in some cases (such as
2710 * redeclarations) the declaration may not actually be added to the
2711 * instruction stream.
2713 exec_list initializer_instructions
;
2714 ir_variable
*earlier
= get_variable_being_redeclared(var
, decl
, state
);
2716 if (decl
->initializer
!= NULL
) {
2717 result
= process_initializer((earlier
== NULL
) ? var
: earlier
,
2719 &initializer_instructions
, state
);
2722 /* From page 23 (page 29 of the PDF) of the GLSL 1.10 spec:
2724 * "It is an error to write to a const variable outside of
2725 * its declaration, so they must be initialized when
2728 if (this->type
->qualifier
.flags
.q
.constant
&& decl
->initializer
== NULL
) {
2729 _mesa_glsl_error(& loc
, state
,
2730 "const declaration of `%s' must be initialized",
2734 /* If the declaration is not a redeclaration, there are a few additional
2735 * semantic checks that must be applied. In addition, variable that was
2736 * created for the declaration should be added to the IR stream.
2738 if (earlier
== NULL
) {
2739 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
2741 * "Identifiers starting with "gl_" are reserved for use by
2742 * OpenGL, and may not be declared in a shader as either a
2743 * variable or a function."
2745 if (strncmp(decl
->identifier
, "gl_", 3) == 0)
2746 _mesa_glsl_error(& loc
, state
,
2747 "identifier `%s' uses reserved `gl_' prefix",
2750 /* Add the variable to the symbol table. Note that the initializer's
2751 * IR was already processed earlier (though it hasn't been emitted
2752 * yet), without the variable in scope.
2754 * This differs from most C-like languages, but it follows the GLSL
2755 * specification. From page 28 (page 34 of the PDF) of the GLSL 1.50
2758 * "Within a declaration, the scope of a name starts immediately
2759 * after the initializer if present or immediately after the name
2760 * being declared if not."
2762 if (!state
->symbols
->add_variable(var
)) {
2763 YYLTYPE loc
= this->get_location();
2764 _mesa_glsl_error(&loc
, state
, "name `%s' already taken in the "
2765 "current scope", decl
->identifier
);
2769 /* Push the variable declaration to the top. It means that all the
2770 * variable declarations will appear in a funny last-to-first order,
2771 * but otherwise we run into trouble if a function is prototyped, a
2772 * global var is decled, then the function is defined with usage of
2773 * the global var. See glslparsertest's CorrectModule.frag.
2775 instructions
->push_head(var
);
2778 instructions
->append_list(&initializer_instructions
);
2782 /* Generally, variable declarations do not have r-values. However,
2783 * one is used for the declaration in
2785 * while (bool b = some_condition()) {
2789 * so we return the rvalue from the last seen declaration here.
2796 ast_parameter_declarator::hir(exec_list
*instructions
,
2797 struct _mesa_glsl_parse_state
*state
)
2800 const struct glsl_type
*type
;
2801 const char *name
= NULL
;
2802 YYLTYPE loc
= this->get_location();
2804 type
= this->type
->specifier
->glsl_type(& name
, state
);
2808 _mesa_glsl_error(& loc
, state
,
2809 "invalid type `%s' in declaration of `%s'",
2810 name
, this->identifier
);
2812 _mesa_glsl_error(& loc
, state
,
2813 "invalid type in declaration of `%s'",
2817 type
= glsl_type::error_type
;
2820 /* From page 62 (page 68 of the PDF) of the GLSL 1.50 spec:
2822 * "Functions that accept no input arguments need not use void in the
2823 * argument list because prototypes (or definitions) are required and
2824 * therefore there is no ambiguity when an empty argument list "( )" is
2825 * declared. The idiom "(void)" as a parameter list is provided for
2828 * Placing this check here prevents a void parameter being set up
2829 * for a function, which avoids tripping up checks for main taking
2830 * parameters and lookups of an unnamed symbol.
2832 if (type
->is_void()) {
2833 if (this->identifier
!= NULL
)
2834 _mesa_glsl_error(& loc
, state
,
2835 "named parameter cannot have type `void'");
2841 if (formal_parameter
&& (this->identifier
== NULL
)) {
2842 _mesa_glsl_error(& loc
, state
, "formal parameter lacks a name");
2846 /* This only handles "vec4 foo[..]". The earlier specifier->glsl_type(...)
2847 * call already handled the "vec4[..] foo" case.
2849 if (this->is_array
) {
2850 type
= process_array_type(&loc
, type
, this->array_size
, state
);
2853 if (type
->array_size() == 0) {
2854 _mesa_glsl_error(&loc
, state
, "arrays passed as parameters must have "
2855 "a declared size.");
2856 type
= glsl_type::error_type
;
2860 ir_variable
*var
= new(ctx
) ir_variable(type
, this->identifier
, ir_var_in
);
2862 /* Apply any specified qualifiers to the parameter declaration. Note that
2863 * for function parameters the default mode is 'in'.
2865 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
, & loc
);
2867 instructions
->push_tail(var
);
2869 /* Parameter declarations do not have r-values.
2876 ast_parameter_declarator::parameters_to_hir(exec_list
*ast_parameters
,
2878 exec_list
*ir_parameters
,
2879 _mesa_glsl_parse_state
*state
)
2881 ast_parameter_declarator
*void_param
= NULL
;
2884 foreach_list_typed (ast_parameter_declarator
, param
, link
, ast_parameters
) {
2885 param
->formal_parameter
= formal
;
2886 param
->hir(ir_parameters
, state
);
2894 if ((void_param
!= NULL
) && (count
> 1)) {
2895 YYLTYPE loc
= void_param
->get_location();
2897 _mesa_glsl_error(& loc
, state
,
2898 "`void' parameter must be only parameter");
2904 emit_function(_mesa_glsl_parse_state
*state
, exec_list
*instructions
,
2907 /* Emit the new function header */
2908 if (state
->current_function
== NULL
) {
2909 instructions
->push_tail(f
);
2911 /* IR invariants disallow function declarations or definitions nested
2912 * within other function definitions. Insert the new ir_function
2913 * block in the instruction sequence before the ir_function block
2914 * containing the current ir_function_signature.
2916 ir_function
*const curr
=
2917 const_cast<ir_function
*>(state
->current_function
->function());
2919 curr
->insert_before(f
);
2925 ast_function::hir(exec_list
*instructions
,
2926 struct _mesa_glsl_parse_state
*state
)
2929 ir_function
*f
= NULL
;
2930 ir_function_signature
*sig
= NULL
;
2931 exec_list hir_parameters
;
2933 const char *const name
= identifier
;
2935 /* From page 21 (page 27 of the PDF) of the GLSL 1.20 spec,
2937 * "Function declarations (prototypes) cannot occur inside of functions;
2938 * they must be at global scope, or for the built-in functions, outside
2939 * the global scope."
2941 * From page 27 (page 33 of the PDF) of the GLSL ES 1.00.16 spec,
2943 * "User defined functions may only be defined within the global scope."
2945 * Note that this language does not appear in GLSL 1.10.
2947 if ((state
->current_function
!= NULL
) && (state
->language_version
!= 110)) {
2948 YYLTYPE loc
= this->get_location();
2949 _mesa_glsl_error(&loc
, state
,
2950 "declaration of function `%s' not allowed within "
2951 "function body", name
);
2954 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
2956 * "Identifiers starting with "gl_" are reserved for use by
2957 * OpenGL, and may not be declared in a shader as either a
2958 * variable or a function."
2960 if (strncmp(name
, "gl_", 3) == 0) {
2961 YYLTYPE loc
= this->get_location();
2962 _mesa_glsl_error(&loc
, state
,
2963 "identifier `%s' uses reserved `gl_' prefix", name
);
2966 /* Convert the list of function parameters to HIR now so that they can be
2967 * used below to compare this function's signature with previously seen
2968 * signatures for functions with the same name.
2970 ast_parameter_declarator::parameters_to_hir(& this->parameters
,
2972 & hir_parameters
, state
);
2974 const char *return_type_name
;
2975 const glsl_type
*return_type
=
2976 this->return_type
->specifier
->glsl_type(& return_type_name
, state
);
2979 YYLTYPE loc
= this->get_location();
2980 _mesa_glsl_error(&loc
, state
,
2981 "function `%s' has undeclared return type `%s'",
2982 name
, return_type_name
);
2983 return_type
= glsl_type::error_type
;
2986 /* From page 56 (page 62 of the PDF) of the GLSL 1.30 spec:
2987 * "No qualifier is allowed on the return type of a function."
2989 if (this->return_type
->has_qualifiers()) {
2990 YYLTYPE loc
= this->get_location();
2991 _mesa_glsl_error(& loc
, state
,
2992 "function `%s' return type has qualifiers", name
);
2995 /* Verify that this function's signature either doesn't match a previously
2996 * seen signature for a function with the same name, or, if a match is found,
2997 * that the previously seen signature does not have an associated definition.
2999 f
= state
->symbols
->get_function(name
);
3000 if (f
!= NULL
&& (state
->es_shader
|| f
->has_user_signature())) {
3001 sig
= f
->exact_matching_signature(&hir_parameters
);
3003 const char *badvar
= sig
->qualifiers_match(&hir_parameters
);
3004 if (badvar
!= NULL
) {
3005 YYLTYPE loc
= this->get_location();
3007 _mesa_glsl_error(&loc
, state
, "function `%s' parameter `%s' "
3008 "qualifiers don't match prototype", name
, badvar
);
3011 if (sig
->return_type
!= return_type
) {
3012 YYLTYPE loc
= this->get_location();
3014 _mesa_glsl_error(&loc
, state
, "function `%s' return type doesn't "
3015 "match prototype", name
);
3018 if (is_definition
&& sig
->is_defined
) {
3019 YYLTYPE loc
= this->get_location();
3021 _mesa_glsl_error(& loc
, state
, "function `%s' redefined", name
);
3025 f
= new(ctx
) ir_function(name
);
3026 if (!state
->symbols
->add_function(f
)) {
3027 /* This function name shadows a non-function use of the same name. */
3028 YYLTYPE loc
= this->get_location();
3030 _mesa_glsl_error(&loc
, state
, "function name `%s' conflicts with "
3031 "non-function", name
);
3035 emit_function(state
, instructions
, f
);
3038 /* Verify the return type of main() */
3039 if (strcmp(name
, "main") == 0) {
3040 if (! return_type
->is_void()) {
3041 YYLTYPE loc
= this->get_location();
3043 _mesa_glsl_error(& loc
, state
, "main() must return void");
3046 if (!hir_parameters
.is_empty()) {
3047 YYLTYPE loc
= this->get_location();
3049 _mesa_glsl_error(& loc
, state
, "main() must not take any parameters");
3053 /* Finish storing the information about this new function in its signature.
3056 sig
= new(ctx
) ir_function_signature(return_type
);
3057 f
->add_signature(sig
);
3060 sig
->replace_parameters(&hir_parameters
);
3063 /* Function declarations (prototypes) do not have r-values.
3070 ast_function_definition::hir(exec_list
*instructions
,
3071 struct _mesa_glsl_parse_state
*state
)
3073 prototype
->is_definition
= true;
3074 prototype
->hir(instructions
, state
);
3076 ir_function_signature
*signature
= prototype
->signature
;
3077 if (signature
== NULL
)
3080 assert(state
->current_function
== NULL
);
3081 state
->current_function
= signature
;
3082 state
->found_return
= false;
3084 /* Duplicate parameters declared in the prototype as concrete variables.
3085 * Add these to the symbol table.
3087 state
->symbols
->push_scope();
3088 foreach_iter(exec_list_iterator
, iter
, signature
->parameters
) {
3089 ir_variable
*const var
= ((ir_instruction
*) iter
.get())->as_variable();
3091 assert(var
!= NULL
);
3093 /* The only way a parameter would "exist" is if two parameters have
3096 if (state
->symbols
->name_declared_this_scope(var
->name
)) {
3097 YYLTYPE loc
= this->get_location();
3099 _mesa_glsl_error(& loc
, state
, "parameter `%s' redeclared", var
->name
);
3101 state
->symbols
->add_variable(var
);
3105 /* Convert the body of the function to HIR. */
3106 this->body
->hir(&signature
->body
, state
);
3107 signature
->is_defined
= true;
3109 state
->symbols
->pop_scope();
3111 assert(state
->current_function
== signature
);
3112 state
->current_function
= NULL
;
3114 if (!signature
->return_type
->is_void() && !state
->found_return
) {
3115 YYLTYPE loc
= this->get_location();
3116 _mesa_glsl_error(& loc
, state
, "function `%s' has non-void return type "
3117 "%s, but no return statement",
3118 signature
->function_name(),
3119 signature
->return_type
->name
);
3122 /* Function definitions do not have r-values.
3129 ast_jump_statement::hir(exec_list
*instructions
,
3130 struct _mesa_glsl_parse_state
*state
)
3137 assert(state
->current_function
);
3139 if (opt_return_value
) {
3140 ir_rvalue
*const ret
= opt_return_value
->hir(instructions
, state
);
3142 /* The value of the return type can be NULL if the shader says
3143 * 'return foo();' and foo() is a function that returns void.
3145 * NOTE: The GLSL spec doesn't say that this is an error. The type
3146 * of the return value is void. If the return type of the function is
3147 * also void, then this should compile without error. Seriously.
3149 const glsl_type
*const ret_type
=
3150 (ret
== NULL
) ? glsl_type::void_type
: ret
->type
;
3152 /* Implicit conversions are not allowed for return values. */
3153 if (state
->current_function
->return_type
!= ret_type
) {
3154 YYLTYPE loc
= this->get_location();
3156 _mesa_glsl_error(& loc
, state
,
3157 "`return' with wrong type %s, in function `%s' "
3160 state
->current_function
->function_name(),
3161 state
->current_function
->return_type
->name
);
3164 inst
= new(ctx
) ir_return(ret
);
3166 if (state
->current_function
->return_type
->base_type
!=
3168 YYLTYPE loc
= this->get_location();
3170 _mesa_glsl_error(& loc
, state
,
3171 "`return' with no value, in function %s returning "
3173 state
->current_function
->function_name());
3175 inst
= new(ctx
) ir_return
;
3178 state
->found_return
= true;
3179 instructions
->push_tail(inst
);
3184 if (state
->target
!= fragment_shader
) {
3185 YYLTYPE loc
= this->get_location();
3187 _mesa_glsl_error(& loc
, state
,
3188 "`discard' may only appear in a fragment shader");
3190 instructions
->push_tail(new(ctx
) ir_discard
);
3195 /* FINISHME: Handle switch-statements. They cannot contain 'continue',
3196 * FINISHME: and they use a different IR instruction for 'break'.
3198 /* FINISHME: Correctly handle the nesting. If a switch-statement is
3199 * FINISHME: inside a loop, a 'continue' is valid and will bind to the
3202 if (state
->loop_or_switch_nesting
== NULL
) {
3203 YYLTYPE loc
= this->get_location();
3205 _mesa_glsl_error(& loc
, state
,
3206 "`%s' may only appear in a loop",
3207 (mode
== ast_break
) ? "break" : "continue");
3209 ir_loop
*const loop
= state
->loop_or_switch_nesting
->as_loop();
3211 /* Inline the for loop expression again, since we don't know
3212 * where near the end of the loop body the normal copy of it
3213 * is going to be placed.
3215 if (mode
== ast_continue
&&
3216 state
->loop_or_switch_nesting_ast
->rest_expression
) {
3217 state
->loop_or_switch_nesting_ast
->rest_expression
->hir(instructions
,
3222 ir_loop_jump
*const jump
=
3223 new(ctx
) ir_loop_jump((mode
== ast_break
)
3224 ? ir_loop_jump::jump_break
3225 : ir_loop_jump::jump_continue
);
3226 instructions
->push_tail(jump
);
3233 /* Jump instructions do not have r-values.
3240 ast_selection_statement::hir(exec_list
*instructions
,
3241 struct _mesa_glsl_parse_state
*state
)
3245 ir_rvalue
*const condition
= this->condition
->hir(instructions
, state
);
3247 /* From page 66 (page 72 of the PDF) of the GLSL 1.50 spec:
3249 * "Any expression whose type evaluates to a Boolean can be used as the
3250 * conditional expression bool-expression. Vector types are not accepted
3251 * as the expression to if."
3253 * The checks are separated so that higher quality diagnostics can be
3254 * generated for cases where both rules are violated.
3256 if (!condition
->type
->is_boolean() || !condition
->type
->is_scalar()) {
3257 YYLTYPE loc
= this->condition
->get_location();
3259 _mesa_glsl_error(& loc
, state
, "if-statement condition must be scalar "
3263 ir_if
*const stmt
= new(ctx
) ir_if(condition
);
3265 if (then_statement
!= NULL
) {
3266 state
->symbols
->push_scope();
3267 then_statement
->hir(& stmt
->then_instructions
, state
);
3268 state
->symbols
->pop_scope();
3271 if (else_statement
!= NULL
) {
3272 state
->symbols
->push_scope();
3273 else_statement
->hir(& stmt
->else_instructions
, state
);
3274 state
->symbols
->pop_scope();
3277 instructions
->push_tail(stmt
);
3279 /* if-statements do not have r-values.
3286 ast_iteration_statement::condition_to_hir(ir_loop
*stmt
,
3287 struct _mesa_glsl_parse_state
*state
)
3291 if (condition
!= NULL
) {
3292 ir_rvalue
*const cond
=
3293 condition
->hir(& stmt
->body_instructions
, state
);
3296 || !cond
->type
->is_boolean() || !cond
->type
->is_scalar()) {
3297 YYLTYPE loc
= condition
->get_location();
3299 _mesa_glsl_error(& loc
, state
,
3300 "loop condition must be scalar boolean");
3302 /* As the first code in the loop body, generate a block that looks
3303 * like 'if (!condition) break;' as the loop termination condition.
3305 ir_rvalue
*const not_cond
=
3306 new(ctx
) ir_expression(ir_unop_logic_not
, glsl_type::bool_type
, cond
,
3309 ir_if
*const if_stmt
= new(ctx
) ir_if(not_cond
);
3311 ir_jump
*const break_stmt
=
3312 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
3314 if_stmt
->then_instructions
.push_tail(break_stmt
);
3315 stmt
->body_instructions
.push_tail(if_stmt
);
3322 ast_iteration_statement::hir(exec_list
*instructions
,
3323 struct _mesa_glsl_parse_state
*state
)
3327 /* For-loops and while-loops start a new scope, but do-while loops do not.
3329 if (mode
!= ast_do_while
)
3330 state
->symbols
->push_scope();
3332 if (init_statement
!= NULL
)
3333 init_statement
->hir(instructions
, state
);
3335 ir_loop
*const stmt
= new(ctx
) ir_loop();
3336 instructions
->push_tail(stmt
);
3338 /* Track the current loop and / or switch-statement nesting.
3340 ir_instruction
*const nesting
= state
->loop_or_switch_nesting
;
3341 ast_iteration_statement
*nesting_ast
= state
->loop_or_switch_nesting_ast
;
3343 state
->loop_or_switch_nesting
= stmt
;
3344 state
->loop_or_switch_nesting_ast
= this;
3346 if (mode
!= ast_do_while
)
3347 condition_to_hir(stmt
, state
);
3350 body
->hir(& stmt
->body_instructions
, state
);
3352 if (rest_expression
!= NULL
)
3353 rest_expression
->hir(& stmt
->body_instructions
, state
);
3355 if (mode
== ast_do_while
)
3356 condition_to_hir(stmt
, state
);
3358 if (mode
!= ast_do_while
)
3359 state
->symbols
->pop_scope();
3361 /* Restore previous nesting before returning.
3363 state
->loop_or_switch_nesting
= nesting
;
3364 state
->loop_or_switch_nesting_ast
= nesting_ast
;
3366 /* Loops do not have r-values.
3373 ast_type_specifier::hir(exec_list
*instructions
,
3374 struct _mesa_glsl_parse_state
*state
)
3376 if (!this->is_precision_statement
&& this->structure
== NULL
)
3379 YYLTYPE loc
= this->get_location();
3381 if (this->precision
!= ast_precision_none
3382 && state
->language_version
!= 100
3383 && state
->language_version
< 130) {
3384 _mesa_glsl_error(&loc
, state
,
3385 "precision qualifiers exist only in "
3386 "GLSL ES 1.00, and GLSL 1.30 and later");
3389 if (this->precision
!= ast_precision_none
3390 && this->structure
!= NULL
) {
3391 _mesa_glsl_error(&loc
, state
,
3392 "precision qualifiers do not apply to structures");
3396 /* If this is a precision statement, check that the type to which it is
3397 * applied is either float or int.
3399 * From section 4.5.3 of the GLSL 1.30 spec:
3400 * "The precision statement
3401 * precision precision-qualifier type;
3402 * can be used to establish a default precision qualifier. The type
3403 * field can be either int or float [...]. Any other types or
3404 * qualifiers will result in an error.
3406 if (this->is_precision_statement
) {
3407 assert(this->precision
!= ast_precision_none
);
3408 assert(this->structure
== NULL
); /* The check for structures was
3409 * performed above. */
3410 if (this->is_array
) {
3411 _mesa_glsl_error(&loc
, state
,
3412 "default precision statements do not apply to "
3416 if (this->type_specifier
!= ast_float
3417 && this->type_specifier
!= ast_int
) {
3418 _mesa_glsl_error(&loc
, state
,
3419 "default precision statements apply only to types "
3424 /* FINISHME: Translate precision statements into IR. */
3428 if (this->structure
!= NULL
)
3429 return this->structure
->hir(instructions
, state
);
3436 ast_struct_specifier::hir(exec_list
*instructions
,
3437 struct _mesa_glsl_parse_state
*state
)
3439 unsigned decl_count
= 0;
3441 /* Make an initial pass over the list of structure fields to determine how
3442 * many there are. Each element in this list is an ast_declarator_list.
3443 * This means that we actually need to count the number of elements in the
3444 * 'declarations' list in each of the elements.
3446 foreach_list_typed (ast_declarator_list
, decl_list
, link
,
3447 &this->declarations
) {
3448 foreach_list_const (decl_ptr
, & decl_list
->declarations
) {
3453 /* Allocate storage for the structure fields and process the field
3454 * declarations. As the declarations are processed, try to also convert
3455 * the types to HIR. This ensures that structure definitions embedded in
3456 * other structure definitions are processed.
3458 glsl_struct_field
*const fields
= ralloc_array(state
, glsl_struct_field
,
3462 foreach_list_typed (ast_declarator_list
, decl_list
, link
,
3463 &this->declarations
) {
3464 const char *type_name
;
3466 decl_list
->type
->specifier
->hir(instructions
, state
);
3468 /* Section 10.9 of the GLSL ES 1.00 specification states that
3469 * embedded structure definitions have been removed from the language.
3471 if (state
->es_shader
&& decl_list
->type
->specifier
->structure
!= NULL
) {
3472 YYLTYPE loc
= this->get_location();
3473 _mesa_glsl_error(&loc
, state
, "Embedded structure definitions are "
3474 "not allowed in GLSL ES 1.00.");
3477 const glsl_type
*decl_type
=
3478 decl_list
->type
->specifier
->glsl_type(& type_name
, state
);
3480 foreach_list_typed (ast_declaration
, decl
, link
,
3481 &decl_list
->declarations
) {
3482 const struct glsl_type
*field_type
= decl_type
;
3483 if (decl
->is_array
) {
3484 YYLTYPE loc
= decl
->get_location();
3485 field_type
= process_array_type(&loc
, decl_type
, decl
->array_size
,
3488 fields
[i
].type
= (field_type
!= NULL
)
3489 ? field_type
: glsl_type::error_type
;
3490 fields
[i
].name
= decl
->identifier
;
3495 assert(i
== decl_count
);
3497 const glsl_type
*t
=
3498 glsl_type::get_record_instance(fields
, decl_count
, this->name
);
3500 YYLTYPE loc
= this->get_location();
3501 if (!state
->symbols
->add_type(name
, t
)) {
3502 _mesa_glsl_error(& loc
, state
, "struct `%s' previously defined", name
);
3504 const glsl_type
**s
= reralloc(state
, state
->user_structures
,
3506 state
->num_user_structures
+ 1);
3508 s
[state
->num_user_structures
] = t
;
3509 state
->user_structures
= s
;
3510 state
->num_user_structures
++;
3514 /* Structure type definitions do not have r-values.