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 state
->toplevel_ir
= instructions
;
71 /* Section 4.2 of the GLSL 1.20 specification states:
72 * "The built-in functions are scoped in a scope outside the global scope
73 * users declare global variables in. That is, a shader's global scope,
74 * available for user-defined functions and global variables, is nested
75 * inside the scope containing the built-in functions."
77 * Since built-in functions like ftransform() access built-in variables,
78 * it follows that those must be in the outer scope as well.
80 * We push scope here to create this nesting effect...but don't pop.
81 * This way, a shader's globals are still in the symbol table for use
84 state
->symbols
->push_scope();
86 foreach_list_typed (ast_node
, ast
, link
, & state
->translation_unit
)
87 ast
->hir(instructions
, state
);
89 detect_recursion_unlinked(state
, instructions
);
91 state
->toplevel_ir
= NULL
;
96 * If a conversion is available, convert one operand to a different type
98 * The \c from \c ir_rvalue is converted "in place".
100 * \param to Type that the operand it to be converted to
101 * \param from Operand that is being converted
102 * \param state GLSL compiler state
105 * If a conversion is possible (or unnecessary), \c true is returned.
106 * Otherwise \c false is returned.
109 apply_implicit_conversion(const glsl_type
*to
, ir_rvalue
* &from
,
110 struct _mesa_glsl_parse_state
*state
)
113 if (to
->base_type
== from
->type
->base_type
)
116 /* This conversion was added in GLSL 1.20. If the compilation mode is
117 * GLSL 1.10, the conversion is skipped.
119 if (state
->language_version
< 120)
122 /* From page 27 (page 33 of the PDF) of the GLSL 1.50 spec:
124 * "There are no implicit array or structure conversions. For
125 * example, an array of int cannot be implicitly converted to an
126 * array of float. There are no implicit conversions between
127 * signed and unsigned integers."
129 /* FINISHME: The above comment is partially a lie. There is int/uint
130 * FINISHME: conversion for immediate constants.
132 if (!to
->is_float() || !from
->type
->is_numeric())
135 /* Convert to a floating point type with the same number of components
136 * as the original type - i.e. int to float, not int to vec4.
138 to
= glsl_type::get_instance(GLSL_TYPE_FLOAT
, from
->type
->vector_elements
,
139 from
->type
->matrix_columns
);
141 switch (from
->type
->base_type
) {
143 from
= new(ctx
) ir_expression(ir_unop_i2f
, to
, from
, NULL
);
146 from
= new(ctx
) ir_expression(ir_unop_u2f
, to
, from
, NULL
);
149 from
= new(ctx
) ir_expression(ir_unop_b2f
, to
, from
, NULL
);
159 static const struct glsl_type
*
160 arithmetic_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
162 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
164 const glsl_type
*type_a
= value_a
->type
;
165 const glsl_type
*type_b
= value_b
->type
;
167 /* From GLSL 1.50 spec, page 56:
169 * "The arithmetic binary operators add (+), subtract (-),
170 * multiply (*), and divide (/) operate on integer and
171 * floating-point scalars, vectors, and matrices."
173 if (!type_a
->is_numeric() || !type_b
->is_numeric()) {
174 _mesa_glsl_error(loc
, state
,
175 "Operands to arithmetic operators must be numeric");
176 return glsl_type::error_type
;
180 /* "If one operand is floating-point based and the other is
181 * not, then the conversions from Section 4.1.10 "Implicit
182 * Conversions" are applied to the non-floating-point-based operand."
184 if (!apply_implicit_conversion(type_a
, value_b
, state
)
185 && !apply_implicit_conversion(type_b
, value_a
, state
)) {
186 _mesa_glsl_error(loc
, state
,
187 "Could not implicitly convert operands to "
188 "arithmetic operator");
189 return glsl_type::error_type
;
191 type_a
= value_a
->type
;
192 type_b
= value_b
->type
;
194 /* "If the operands are integer types, they must both be signed or
197 * From this rule and the preceeding conversion it can be inferred that
198 * both types must be GLSL_TYPE_FLOAT, or GLSL_TYPE_UINT, or GLSL_TYPE_INT.
199 * The is_numeric check above already filtered out the case where either
200 * type is not one of these, so now the base types need only be tested for
203 if (type_a
->base_type
!= type_b
->base_type
) {
204 _mesa_glsl_error(loc
, state
,
205 "base type mismatch for arithmetic operator");
206 return glsl_type::error_type
;
209 /* "All arithmetic binary operators result in the same fundamental type
210 * (signed integer, unsigned integer, or floating-point) as the
211 * operands they operate on, after operand type conversion. After
212 * conversion, the following cases are valid
214 * * The two operands are scalars. In this case the operation is
215 * applied, resulting in a scalar."
217 if (type_a
->is_scalar() && type_b
->is_scalar())
220 /* "* One operand is a scalar, and the other is a vector or matrix.
221 * In this case, the scalar operation is applied independently to each
222 * component of the vector or matrix, resulting in the same size
225 if (type_a
->is_scalar()) {
226 if (!type_b
->is_scalar())
228 } else if (type_b
->is_scalar()) {
232 /* All of the combinations of <scalar, scalar>, <vector, scalar>,
233 * <scalar, vector>, <scalar, matrix>, and <matrix, scalar> have been
236 assert(!type_a
->is_scalar());
237 assert(!type_b
->is_scalar());
239 /* "* The two operands are vectors of the same size. In this case, the
240 * operation is done component-wise resulting in the same size
243 if (type_a
->is_vector() && type_b
->is_vector()) {
244 if (type_a
== type_b
) {
247 _mesa_glsl_error(loc
, state
,
248 "vector size mismatch for arithmetic operator");
249 return glsl_type::error_type
;
253 /* All of the combinations of <scalar, scalar>, <vector, scalar>,
254 * <scalar, vector>, <scalar, matrix>, <matrix, scalar>, and
255 * <vector, vector> have been handled. At least one of the operands must
256 * be matrix. Further, since there are no integer matrix types, the base
257 * type of both operands must be float.
259 assert(type_a
->is_matrix() || type_b
->is_matrix());
260 assert(type_a
->base_type
== GLSL_TYPE_FLOAT
);
261 assert(type_b
->base_type
== GLSL_TYPE_FLOAT
);
263 /* "* The operator is add (+), subtract (-), or divide (/), and the
264 * operands are matrices with the same number of rows and the same
265 * number of columns. In this case, the operation is done component-
266 * wise resulting in the same size matrix."
267 * * The operator is multiply (*), where both operands are matrices or
268 * one operand is a vector and the other a matrix. A right vector
269 * operand is treated as a column vector and a left vector operand as a
270 * row vector. In all these cases, it is required that the number of
271 * columns of the left operand is equal to the number of rows of the
272 * right operand. Then, the multiply (*) operation does a linear
273 * algebraic multiply, yielding an object that has the same number of
274 * rows as the left operand and the same number of columns as the right
275 * operand. Section 5.10 "Vector and Matrix Operations" explains in
276 * more detail how vectors and matrices are operated on."
279 if (type_a
== type_b
)
282 if (type_a
->is_matrix() && type_b
->is_matrix()) {
283 /* Matrix multiply. The columns of A must match the rows of B. Given
284 * the other previously tested constraints, this means the vector type
285 * of a row from A must be the same as the vector type of a column from
288 if (type_a
->row_type() == type_b
->column_type()) {
289 /* The resulting matrix has the number of columns of matrix B and
290 * the number of rows of matrix A. We get the row count of A by
291 * looking at the size of a vector that makes up a column. The
292 * transpose (size of a row) is done for B.
294 const glsl_type
*const type
=
295 glsl_type::get_instance(type_a
->base_type
,
296 type_a
->column_type()->vector_elements
,
297 type_b
->row_type()->vector_elements
);
298 assert(type
!= glsl_type::error_type
);
302 } else if (type_a
->is_matrix()) {
303 /* A is a matrix and B is a column vector. Columns of A must match
304 * rows of B. Given the other previously tested constraints, this
305 * means the vector type of a row from A must be the same as the
306 * vector the type of B.
308 if (type_a
->row_type() == type_b
) {
309 /* The resulting vector has a number of elements equal to
310 * the number of rows of matrix A. */
311 const glsl_type
*const type
=
312 glsl_type::get_instance(type_a
->base_type
,
313 type_a
->column_type()->vector_elements
,
315 assert(type
!= glsl_type::error_type
);
320 assert(type_b
->is_matrix());
322 /* A is a row vector and B is a matrix. Columns of A must match rows
323 * of B. Given the other previously tested constraints, this means
324 * the type of A must be the same as the vector type of a column from
327 if (type_a
== type_b
->column_type()) {
328 /* The resulting vector has a number of elements equal to
329 * the number of columns of matrix B. */
330 const glsl_type
*const type
=
331 glsl_type::get_instance(type_a
->base_type
,
332 type_b
->row_type()->vector_elements
,
334 assert(type
!= glsl_type::error_type
);
340 _mesa_glsl_error(loc
, state
, "size mismatch for matrix multiplication");
341 return glsl_type::error_type
;
345 /* "All other cases are illegal."
347 _mesa_glsl_error(loc
, state
, "type mismatch");
348 return glsl_type::error_type
;
352 static const struct glsl_type
*
353 unary_arithmetic_result_type(const struct glsl_type
*type
,
354 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
356 /* From GLSL 1.50 spec, page 57:
358 * "The arithmetic unary operators negate (-), post- and pre-increment
359 * and decrement (-- and ++) operate on integer or floating-point
360 * values (including vectors and matrices). All unary operators work
361 * component-wise on their operands. These result with the same type
364 if (!type
->is_numeric()) {
365 _mesa_glsl_error(loc
, state
,
366 "Operands to arithmetic operators must be numeric");
367 return glsl_type::error_type
;
374 * \brief Return the result type of a bit-logic operation.
376 * If the given types to the bit-logic operator are invalid, return
377 * glsl_type::error_type.
379 * \param type_a Type of LHS of bit-logic op
380 * \param type_b Type of RHS of bit-logic op
382 static const struct glsl_type
*
383 bit_logic_result_type(const struct glsl_type
*type_a
,
384 const struct glsl_type
*type_b
,
386 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
388 if (state
->language_version
< 130) {
389 _mesa_glsl_error(loc
, state
, "bit operations require GLSL 1.30");
390 return glsl_type::error_type
;
393 /* From page 50 (page 56 of PDF) of GLSL 1.30 spec:
395 * "The bitwise operators and (&), exclusive-or (^), and inclusive-or
396 * (|). The operands must be of type signed or unsigned integers or
399 if (!type_a
->is_integer()) {
400 _mesa_glsl_error(loc
, state
, "LHS of `%s' must be an integer",
401 ast_expression::operator_string(op
));
402 return glsl_type::error_type
;
404 if (!type_b
->is_integer()) {
405 _mesa_glsl_error(loc
, state
, "RHS of `%s' must be an integer",
406 ast_expression::operator_string(op
));
407 return glsl_type::error_type
;
410 /* "The fundamental types of the operands (signed or unsigned) must
413 if (type_a
->base_type
!= type_b
->base_type
) {
414 _mesa_glsl_error(loc
, state
, "operands of `%s' must have the same "
415 "base type", ast_expression::operator_string(op
));
416 return glsl_type::error_type
;
419 /* "The operands cannot be vectors of differing size." */
420 if (type_a
->is_vector() &&
421 type_b
->is_vector() &&
422 type_a
->vector_elements
!= type_b
->vector_elements
) {
423 _mesa_glsl_error(loc
, state
, "operands of `%s' cannot be vectors of "
424 "different sizes", ast_expression::operator_string(op
));
425 return glsl_type::error_type
;
428 /* "If one operand is a scalar and the other a vector, the scalar is
429 * applied component-wise to the vector, resulting in the same type as
430 * the vector. The fundamental types of the operands [...] will be the
431 * resulting fundamental type."
433 if (type_a
->is_scalar())
439 static const struct glsl_type
*
440 modulus_result_type(const struct glsl_type
*type_a
,
441 const struct glsl_type
*type_b
,
442 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
444 if (state
->language_version
< 130) {
445 _mesa_glsl_error(loc
, state
,
446 "operator '%%' is reserved in %s",
447 state
->version_string
);
448 return glsl_type::error_type
;
451 /* From GLSL 1.50 spec, page 56:
452 * "The operator modulus (%) operates on signed or unsigned integers or
453 * integer vectors. The operand types must both be signed or both be
456 if (!type_a
->is_integer()) {
457 _mesa_glsl_error(loc
, state
, "LHS of operator %% must be an integer.");
458 return glsl_type::error_type
;
460 if (!type_b
->is_integer()) {
461 _mesa_glsl_error(loc
, state
, "RHS of operator %% must be an integer.");
462 return glsl_type::error_type
;
464 if (type_a
->base_type
!= type_b
->base_type
) {
465 _mesa_glsl_error(loc
, state
,
466 "operands of %% must have the same base type");
467 return glsl_type::error_type
;
470 /* "The operands cannot be vectors of differing size. If one operand is
471 * a scalar and the other vector, then the scalar is applied component-
472 * wise to the vector, resulting in the same type as the vector. If both
473 * are vectors of the same size, the result is computed component-wise."
475 if (type_a
->is_vector()) {
476 if (!type_b
->is_vector()
477 || (type_a
->vector_elements
== type_b
->vector_elements
))
482 /* "The operator modulus (%) is not defined for any other data types
483 * (non-integer types)."
485 _mesa_glsl_error(loc
, state
, "type mismatch");
486 return glsl_type::error_type
;
490 static const struct glsl_type
*
491 relational_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
492 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
494 const glsl_type
*type_a
= value_a
->type
;
495 const glsl_type
*type_b
= value_b
->type
;
497 /* From GLSL 1.50 spec, page 56:
498 * "The relational operators greater than (>), less than (<), greater
499 * than or equal (>=), and less than or equal (<=) operate only on
500 * scalar integer and scalar floating-point expressions."
502 if (!type_a
->is_numeric()
503 || !type_b
->is_numeric()
504 || !type_a
->is_scalar()
505 || !type_b
->is_scalar()) {
506 _mesa_glsl_error(loc
, state
,
507 "Operands to relational operators must be scalar and "
509 return glsl_type::error_type
;
512 /* "Either the operands' types must match, or the conversions from
513 * Section 4.1.10 "Implicit Conversions" will be applied to the integer
514 * operand, after which the types must match."
516 if (!apply_implicit_conversion(type_a
, value_b
, state
)
517 && !apply_implicit_conversion(type_b
, value_a
, state
)) {
518 _mesa_glsl_error(loc
, state
,
519 "Could not implicitly convert operands to "
520 "relational operator");
521 return glsl_type::error_type
;
523 type_a
= value_a
->type
;
524 type_b
= value_b
->type
;
526 if (type_a
->base_type
!= type_b
->base_type
) {
527 _mesa_glsl_error(loc
, state
, "base type mismatch");
528 return glsl_type::error_type
;
531 /* "The result is scalar Boolean."
533 return glsl_type::bool_type
;
537 * \brief Return the result type of a bit-shift operation.
539 * If the given types to the bit-shift operator are invalid, return
540 * glsl_type::error_type.
542 * \param type_a Type of LHS of bit-shift op
543 * \param type_b Type of RHS of bit-shift op
545 static const struct glsl_type
*
546 shift_result_type(const struct glsl_type
*type_a
,
547 const struct glsl_type
*type_b
,
549 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
551 if (state
->language_version
< 130) {
552 _mesa_glsl_error(loc
, state
, "bit operations require GLSL 1.30");
553 return glsl_type::error_type
;
556 /* From page 50 (page 56 of the PDF) of the GLSL 1.30 spec:
558 * "The shift operators (<<) and (>>). For both operators, the operands
559 * must be signed or unsigned integers or integer vectors. One operand
560 * can be signed while the other is unsigned."
562 if (!type_a
->is_integer()) {
563 _mesa_glsl_error(loc
, state
, "LHS of operator %s must be an integer or "
564 "integer vector", ast_expression::operator_string(op
));
565 return glsl_type::error_type
;
568 if (!type_b
->is_integer()) {
569 _mesa_glsl_error(loc
, state
, "RHS of operator %s must be an integer or "
570 "integer vector", ast_expression::operator_string(op
));
571 return glsl_type::error_type
;
574 /* "If the first operand is a scalar, the second operand has to be
577 if (type_a
->is_scalar() && !type_b
->is_scalar()) {
578 _mesa_glsl_error(loc
, state
, "If the first operand of %s is scalar, the "
579 "second must be scalar as well",
580 ast_expression::operator_string(op
));
581 return glsl_type::error_type
;
584 /* If both operands are vectors, check that they have same number of
587 if (type_a
->is_vector() &&
588 type_b
->is_vector() &&
589 type_a
->vector_elements
!= type_b
->vector_elements
) {
590 _mesa_glsl_error(loc
, state
, "Vector operands to operator %s must "
591 "have same number of elements",
592 ast_expression::operator_string(op
));
593 return glsl_type::error_type
;
596 /* "In all cases, the resulting type will be the same type as the left
603 * Validates that a value can be assigned to a location with a specified type
605 * Validates that \c rhs can be assigned to some location. If the types are
606 * not an exact match but an automatic conversion is possible, \c rhs will be
610 * \c NULL if \c rhs cannot be assigned to a location with type \c lhs_type.
611 * Otherwise the actual RHS to be assigned will be returned. This may be
612 * \c rhs, or it may be \c rhs after some type conversion.
615 * In addition to being used for assignments, this function is used to
616 * type-check return values.
619 validate_assignment(struct _mesa_glsl_parse_state
*state
,
620 const glsl_type
*lhs_type
, ir_rvalue
*rhs
,
623 /* If there is already some error in the RHS, just return it. Anything
624 * else will lead to an avalanche of error message back to the user.
626 if (rhs
->type
->is_error())
629 /* If the types are identical, the assignment can trivially proceed.
631 if (rhs
->type
== lhs_type
)
634 /* If the array element types are the same and the size of the LHS is zero,
635 * the assignment is okay for initializers embedded in variable
638 * Note: Whole-array assignments are not permitted in GLSL 1.10, but this
639 * is handled by ir_dereference::is_lvalue.
641 if (is_initializer
&& lhs_type
->is_array() && rhs
->type
->is_array()
642 && (lhs_type
->element_type() == rhs
->type
->element_type())
643 && (lhs_type
->array_size() == 0)) {
647 /* Check for implicit conversion in GLSL 1.20 */
648 if (apply_implicit_conversion(lhs_type
, rhs
, state
)) {
649 if (rhs
->type
== lhs_type
)
657 mark_whole_array_access(ir_rvalue
*access
)
659 ir_dereference_variable
*deref
= access
->as_dereference_variable();
661 if (deref
&& deref
->var
) {
662 deref
->var
->max_array_access
= deref
->type
->length
- 1;
667 do_assignment(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
,
668 ir_rvalue
*lhs
, ir_rvalue
*rhs
, bool is_initializer
,
672 bool error_emitted
= (lhs
->type
->is_error() || rhs
->type
->is_error());
674 if (!error_emitted
) {
675 if (lhs
->variable_referenced() != NULL
676 && lhs
->variable_referenced()->read_only
) {
677 _mesa_glsl_error(&lhs_loc
, state
,
678 "assignment to read-only variable '%s'",
679 lhs
->variable_referenced()->name
);
680 error_emitted
= true;
682 } else if (!lhs
->is_lvalue()) {
683 _mesa_glsl_error(& lhs_loc
, state
, "non-lvalue in assignment");
684 error_emitted
= true;
687 if (state
->es_shader
&& lhs
->type
->is_array()) {
688 _mesa_glsl_error(&lhs_loc
, state
, "whole array assignment is not "
689 "allowed in GLSL ES 1.00.");
690 error_emitted
= true;
695 validate_assignment(state
, lhs
->type
, rhs
, is_initializer
);
696 if (new_rhs
== NULL
) {
697 _mesa_glsl_error(& lhs_loc
, state
, "type mismatch");
701 /* If the LHS array was not declared with a size, it takes it size from
702 * the RHS. If the LHS is an l-value and a whole array, it must be a
703 * dereference of a variable. Any other case would require that the LHS
704 * is either not an l-value or not a whole array.
706 if (lhs
->type
->array_size() == 0) {
707 ir_dereference
*const d
= lhs
->as_dereference();
711 ir_variable
*const var
= d
->variable_referenced();
715 if (var
->max_array_access
>= unsigned(rhs
->type
->array_size())) {
716 /* FINISHME: This should actually log the location of the RHS. */
717 _mesa_glsl_error(& lhs_loc
, state
, "array size must be > %u due to "
719 var
->max_array_access
);
722 var
->type
= glsl_type::get_array_instance(lhs
->type
->element_type(),
723 rhs
->type
->array_size());
726 mark_whole_array_access(lhs
);
729 /* Most callers of do_assignment (assign, add_assign, pre_inc/dec,
730 * but not post_inc) need the converted assigned value as an rvalue
731 * to handle things like:
735 * So we always just store the computed value being assigned to a
736 * temporary and return a deref of that temporary. If the rvalue
737 * ends up not being used, the temp will get copy-propagated out.
739 ir_variable
*var
= new(ctx
) ir_variable(rhs
->type
, "assignment_tmp",
741 ir_dereference_variable
*deref_var
= new(ctx
) ir_dereference_variable(var
);
742 instructions
->push_tail(var
);
743 instructions
->push_tail(new(ctx
) ir_assignment(deref_var
,
746 deref_var
= new(ctx
) ir_dereference_variable(var
);
749 instructions
->push_tail(new(ctx
) ir_assignment(lhs
, deref_var
, NULL
));
751 return new(ctx
) ir_dereference_variable(var
);
755 get_lvalue_copy(exec_list
*instructions
, ir_rvalue
*lvalue
)
757 void *ctx
= ralloc_parent(lvalue
);
760 var
= new(ctx
) ir_variable(lvalue
->type
, "_post_incdec_tmp",
762 instructions
->push_tail(var
);
763 var
->mode
= ir_var_auto
;
765 instructions
->push_tail(new(ctx
) ir_assignment(new(ctx
) ir_dereference_variable(var
),
768 /* Once we've created this temporary, mark it read only so it's no
769 * longer considered an lvalue.
771 var
->read_only
= true;
773 return new(ctx
) ir_dereference_variable(var
);
778 ast_node::hir(exec_list
*instructions
,
779 struct _mesa_glsl_parse_state
*state
)
788 do_comparison(void *mem_ctx
, int operation
, ir_rvalue
*op0
, ir_rvalue
*op1
)
791 ir_rvalue
*cmp
= NULL
;
793 if (operation
== ir_binop_all_equal
)
794 join_op
= ir_binop_logic_and
;
796 join_op
= ir_binop_logic_or
;
798 switch (op0
->type
->base_type
) {
799 case GLSL_TYPE_FLOAT
:
803 return new(mem_ctx
) ir_expression(operation
, op0
, op1
);
805 case GLSL_TYPE_ARRAY
: {
806 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
807 ir_rvalue
*e0
, *e1
, *result
;
809 e0
= new(mem_ctx
) ir_dereference_array(op0
->clone(mem_ctx
, NULL
),
810 new(mem_ctx
) ir_constant(i
));
811 e1
= new(mem_ctx
) ir_dereference_array(op1
->clone(mem_ctx
, NULL
),
812 new(mem_ctx
) ir_constant(i
));
813 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
816 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
822 mark_whole_array_access(op0
);
823 mark_whole_array_access(op1
);
827 case GLSL_TYPE_STRUCT
: {
828 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
829 ir_rvalue
*e0
, *e1
, *result
;
830 const char *field_name
= op0
->type
->fields
.structure
[i
].name
;
832 e0
= new(mem_ctx
) ir_dereference_record(op0
->clone(mem_ctx
, NULL
),
834 e1
= new(mem_ctx
) ir_dereference_record(op1
->clone(mem_ctx
, NULL
),
836 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
839 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
847 case GLSL_TYPE_ERROR
:
849 case GLSL_TYPE_SAMPLER
:
850 /* I assume a comparison of a struct containing a sampler just
851 * ignores the sampler present in the type.
856 assert(!"Should not get here.");
861 cmp
= new(mem_ctx
) ir_constant(true);
866 /* For logical operations, we want to ensure that the operands are
867 * scalar booleans. If it isn't, emit an error and return a constant
868 * boolean to avoid triggering cascading error messages.
871 get_scalar_boolean_operand(exec_list
*instructions
,
872 struct _mesa_glsl_parse_state
*state
,
873 ast_expression
*parent_expr
,
875 const char *operand_name
,
878 ast_expression
*expr
= parent_expr
->subexpressions
[operand
];
880 ir_rvalue
*val
= expr
->hir(instructions
, state
);
882 if (val
->type
->is_boolean() && val
->type
->is_scalar())
885 if (!*error_emitted
) {
886 YYLTYPE loc
= expr
->get_location();
887 _mesa_glsl_error(&loc
, state
, "%s of `%s' must be scalar boolean",
889 parent_expr
->operator_string(parent_expr
->oper
));
890 *error_emitted
= true;
893 return new(ctx
) ir_constant(true);
897 ast_expression::hir(exec_list
*instructions
,
898 struct _mesa_glsl_parse_state
*state
)
901 static const int operations
[AST_NUM_OPERATORS
] = {
902 -1, /* ast_assign doesn't convert to ir_expression. */
903 -1, /* ast_plus doesn't convert to ir_expression. */
927 /* Note: The following block of expression types actually convert
928 * to multiple IR instructions.
930 ir_binop_mul
, /* ast_mul_assign */
931 ir_binop_div
, /* ast_div_assign */
932 ir_binop_mod
, /* ast_mod_assign */
933 ir_binop_add
, /* ast_add_assign */
934 ir_binop_sub
, /* ast_sub_assign */
935 ir_binop_lshift
, /* ast_ls_assign */
936 ir_binop_rshift
, /* ast_rs_assign */
937 ir_binop_bit_and
, /* ast_and_assign */
938 ir_binop_bit_xor
, /* ast_xor_assign */
939 ir_binop_bit_or
, /* ast_or_assign */
941 -1, /* ast_conditional doesn't convert to ir_expression. */
942 ir_binop_add
, /* ast_pre_inc. */
943 ir_binop_sub
, /* ast_pre_dec. */
944 ir_binop_add
, /* ast_post_inc. */
945 ir_binop_sub
, /* ast_post_dec. */
946 -1, /* ast_field_selection doesn't conv to ir_expression. */
947 -1, /* ast_array_index doesn't convert to ir_expression. */
948 -1, /* ast_function_call doesn't conv to ir_expression. */
949 -1, /* ast_identifier doesn't convert to ir_expression. */
950 -1, /* ast_int_constant doesn't convert to ir_expression. */
951 -1, /* ast_uint_constant doesn't conv to ir_expression. */
952 -1, /* ast_float_constant doesn't conv to ir_expression. */
953 -1, /* ast_bool_constant doesn't conv to ir_expression. */
954 -1, /* ast_sequence doesn't convert to ir_expression. */
956 ir_rvalue
*result
= NULL
;
958 const struct glsl_type
*type
; /* a temporary variable for switch cases */
959 bool error_emitted
= false;
962 loc
= this->get_location();
964 switch (this->oper
) {
966 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
967 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
969 result
= do_assignment(instructions
, state
, op
[0], op
[1], false,
970 this->subexpressions
[0]->get_location());
971 error_emitted
= result
->type
->is_error();
976 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
978 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
980 error_emitted
= type
->is_error();
986 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
988 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
990 error_emitted
= type
->is_error();
992 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1000 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1001 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1003 type
= arithmetic_result_type(op
[0], op
[1],
1004 (this->oper
== ast_mul
),
1006 error_emitted
= type
->is_error();
1008 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1013 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1014 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1016 type
= modulus_result_type(op
[0]->type
, op
[1]->type
, state
, & loc
);
1018 assert(operations
[this->oper
] == ir_binop_mod
);
1020 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1022 error_emitted
= type
->is_error();
1027 if (state
->language_version
< 130) {
1028 _mesa_glsl_error(&loc
, state
, "operator %s requires GLSL 1.30",
1029 operator_string(this->oper
));
1030 error_emitted
= true;
1033 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1034 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1035 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1037 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1039 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1046 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1047 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1049 type
= relational_result_type(op
[0], op
[1], state
, & loc
);
1051 /* The relational operators must either generate an error or result
1052 * in a scalar boolean. See page 57 of the GLSL 1.50 spec.
1054 assert(type
->is_error()
1055 || ((type
->base_type
== GLSL_TYPE_BOOL
)
1056 && type
->is_scalar()));
1058 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1060 error_emitted
= type
->is_error();
1065 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1066 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1068 /* From page 58 (page 64 of the PDF) of the GLSL 1.50 spec:
1070 * "The equality operators equal (==), and not equal (!=)
1071 * operate on all types. They result in a scalar Boolean. If
1072 * the operand types do not match, then there must be a
1073 * conversion from Section 4.1.10 "Implicit Conversions"
1074 * applied to one operand that can make them match, in which
1075 * case this conversion is done."
1077 if ((!apply_implicit_conversion(op
[0]->type
, op
[1], state
)
1078 && !apply_implicit_conversion(op
[1]->type
, op
[0], state
))
1079 || (op
[0]->type
!= op
[1]->type
)) {
1080 _mesa_glsl_error(& loc
, state
, "operands of `%s' must have the same "
1081 "type", (this->oper
== ast_equal
) ? "==" : "!=");
1082 error_emitted
= true;
1083 } else if ((state
->language_version
<= 110)
1084 && (op
[0]->type
->is_array() || op
[1]->type
->is_array())) {
1085 _mesa_glsl_error(& loc
, state
, "array comparisons forbidden in "
1087 error_emitted
= true;
1090 if (error_emitted
) {
1091 result
= new(ctx
) ir_constant(false);
1093 result
= do_comparison(ctx
, operations
[this->oper
], op
[0], op
[1]);
1094 assert(result
->type
== glsl_type::bool_type
);
1101 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1102 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1103 type
= bit_logic_result_type(op
[0]->type
, op
[1]->type
, this->oper
,
1105 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1107 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1111 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1113 if (state
->language_version
< 130) {
1114 _mesa_glsl_error(&loc
, state
, "bit-wise operations require GLSL 1.30");
1115 error_emitted
= true;
1118 if (!op
[0]->type
->is_integer()) {
1119 _mesa_glsl_error(&loc
, state
, "operand of `~' must be an integer");
1120 error_emitted
= true;
1124 result
= new(ctx
) ir_expression(ir_unop_bit_not
, type
, op
[0], NULL
);
1127 case ast_logic_and
: {
1128 exec_list rhs_instructions
;
1129 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1130 "LHS", &error_emitted
);
1131 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1132 "RHS", &error_emitted
);
1134 ir_constant
*op0_const
= op
[0]->constant_expression_value();
1136 if (op0_const
->value
.b
[0]) {
1137 instructions
->append_list(&rhs_instructions
);
1142 type
= glsl_type::bool_type
;
1144 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1147 instructions
->push_tail(tmp
);
1149 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1150 instructions
->push_tail(stmt
);
1152 stmt
->then_instructions
.append_list(&rhs_instructions
);
1153 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1154 ir_assignment
*const then_assign
=
1155 new(ctx
) ir_assignment(then_deref
, op
[1], NULL
);
1156 stmt
->then_instructions
.push_tail(then_assign
);
1158 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1159 ir_assignment
*const else_assign
=
1160 new(ctx
) ir_assignment(else_deref
, new(ctx
) ir_constant(false), NULL
);
1161 stmt
->else_instructions
.push_tail(else_assign
);
1163 result
= new(ctx
) ir_dereference_variable(tmp
);
1169 case ast_logic_or
: {
1170 exec_list rhs_instructions
;
1171 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1172 "LHS", &error_emitted
);
1173 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1174 "RHS", &error_emitted
);
1176 ir_constant
*op0_const
= op
[0]->constant_expression_value();
1178 if (op0_const
->value
.b
[0]) {
1183 type
= glsl_type::bool_type
;
1185 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1188 instructions
->push_tail(tmp
);
1190 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1191 instructions
->push_tail(stmt
);
1193 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1194 ir_assignment
*const then_assign
=
1195 new(ctx
) ir_assignment(then_deref
, new(ctx
) ir_constant(true), NULL
);
1196 stmt
->then_instructions
.push_tail(then_assign
);
1198 stmt
->else_instructions
.append_list(&rhs_instructions
);
1199 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1200 ir_assignment
*const else_assign
=
1201 new(ctx
) ir_assignment(else_deref
, op
[1], NULL
);
1202 stmt
->else_instructions
.push_tail(else_assign
);
1204 result
= new(ctx
) ir_dereference_variable(tmp
);
1211 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1213 * "The logical binary operators and (&&), or ( | | ), and
1214 * exclusive or (^^). They operate only on two Boolean
1215 * expressions and result in a Boolean expression."
1217 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0, "LHS",
1219 op
[1] = get_scalar_boolean_operand(instructions
, state
, this, 1, "RHS",
1222 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1227 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1228 "operand", &error_emitted
);
1230 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1234 case ast_mul_assign
:
1235 case ast_div_assign
:
1236 case ast_add_assign
:
1237 case ast_sub_assign
: {
1238 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1239 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1241 type
= arithmetic_result_type(op
[0], op
[1],
1242 (this->oper
== ast_mul_assign
),
1245 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1248 result
= do_assignment(instructions
, state
,
1249 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1250 this->subexpressions
[0]->get_location());
1251 error_emitted
= (op
[0]->type
->is_error());
1253 /* GLSL 1.10 does not allow array assignment. However, we don't have to
1254 * explicitly test for this because none of the binary expression
1255 * operators allow array operands either.
1261 case ast_mod_assign
: {
1262 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1263 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1265 type
= modulus_result_type(op
[0]->type
, op
[1]->type
, state
, & loc
);
1267 assert(operations
[this->oper
] == ir_binop_mod
);
1269 ir_rvalue
*temp_rhs
;
1270 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1273 result
= do_assignment(instructions
, state
,
1274 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1275 this->subexpressions
[0]->get_location());
1276 error_emitted
= type
->is_error();
1281 case ast_rs_assign
: {
1282 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1283 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1284 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1286 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1287 type
, op
[0], op
[1]);
1288 result
= do_assignment(instructions
, state
, op
[0]->clone(ctx
, NULL
),
1290 this->subexpressions
[0]->get_location());
1291 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1295 case ast_and_assign
:
1296 case ast_xor_assign
:
1297 case ast_or_assign
: {
1298 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1299 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1300 type
= bit_logic_result_type(op
[0]->type
, op
[1]->type
, this->oper
,
1302 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1303 type
, op
[0], op
[1]);
1304 result
= do_assignment(instructions
, state
, op
[0]->clone(ctx
, NULL
),
1306 this->subexpressions
[0]->get_location());
1307 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1311 case ast_conditional
: {
1312 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1314 * "The ternary selection operator (?:). It operates on three
1315 * expressions (exp1 ? exp2 : exp3). This operator evaluates the
1316 * first expression, which must result in a scalar Boolean."
1318 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1319 "condition", &error_emitted
);
1321 /* The :? operator is implemented by generating an anonymous temporary
1322 * followed by an if-statement. The last instruction in each branch of
1323 * the if-statement assigns a value to the anonymous temporary. This
1324 * temporary is the r-value of the expression.
1326 exec_list then_instructions
;
1327 exec_list else_instructions
;
1329 op
[1] = this->subexpressions
[1]->hir(&then_instructions
, state
);
1330 op
[2] = this->subexpressions
[2]->hir(&else_instructions
, state
);
1332 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1334 * "The second and third expressions can be any type, as
1335 * long their types match, or there is a conversion in
1336 * Section 4.1.10 "Implicit Conversions" that can be applied
1337 * to one of the expressions to make their types match. This
1338 * resulting matching type is the type of the entire
1341 if ((!apply_implicit_conversion(op
[1]->type
, op
[2], state
)
1342 && !apply_implicit_conversion(op
[2]->type
, op
[1], state
))
1343 || (op
[1]->type
!= op
[2]->type
)) {
1344 YYLTYPE loc
= this->subexpressions
[1]->get_location();
1346 _mesa_glsl_error(& loc
, state
, "Second and third operands of ?: "
1347 "operator must have matching types.");
1348 error_emitted
= true;
1349 type
= glsl_type::error_type
;
1354 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1356 * "The second and third expressions must be the same type, but can
1357 * be of any type other than an array."
1359 if ((state
->language_version
<= 110) && type
->is_array()) {
1360 _mesa_glsl_error(& loc
, state
, "Second and third operands of ?: "
1361 "operator must not be arrays.");
1362 error_emitted
= true;
1365 ir_constant
*cond_val
= op
[0]->constant_expression_value();
1366 ir_constant
*then_val
= op
[1]->constant_expression_value();
1367 ir_constant
*else_val
= op
[2]->constant_expression_value();
1369 if (then_instructions
.is_empty()
1370 && else_instructions
.is_empty()
1371 && (cond_val
!= NULL
) && (then_val
!= NULL
) && (else_val
!= NULL
)) {
1372 result
= (cond_val
->value
.b
[0]) ? then_val
: else_val
;
1374 ir_variable
*const tmp
=
1375 new(ctx
) ir_variable(type
, "conditional_tmp", ir_var_temporary
);
1376 instructions
->push_tail(tmp
);
1378 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1379 instructions
->push_tail(stmt
);
1381 then_instructions
.move_nodes_to(& stmt
->then_instructions
);
1382 ir_dereference
*const then_deref
=
1383 new(ctx
) ir_dereference_variable(tmp
);
1384 ir_assignment
*const then_assign
=
1385 new(ctx
) ir_assignment(then_deref
, op
[1], NULL
);
1386 stmt
->then_instructions
.push_tail(then_assign
);
1388 else_instructions
.move_nodes_to(& stmt
->else_instructions
);
1389 ir_dereference
*const else_deref
=
1390 new(ctx
) ir_dereference_variable(tmp
);
1391 ir_assignment
*const else_assign
=
1392 new(ctx
) ir_assignment(else_deref
, op
[2], NULL
);
1393 stmt
->else_instructions
.push_tail(else_assign
);
1395 result
= new(ctx
) ir_dereference_variable(tmp
);
1402 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1403 if (op
[0]->type
->base_type
== GLSL_TYPE_FLOAT
)
1404 op
[1] = new(ctx
) ir_constant(1.0f
);
1406 op
[1] = new(ctx
) ir_constant(1);
1408 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1410 ir_rvalue
*temp_rhs
;
1411 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1414 result
= do_assignment(instructions
, state
,
1415 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1416 this->subexpressions
[0]->get_location());
1417 error_emitted
= op
[0]->type
->is_error();
1422 case ast_post_dec
: {
1423 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1424 if (op
[0]->type
->base_type
== GLSL_TYPE_FLOAT
)
1425 op
[1] = new(ctx
) ir_constant(1.0f
);
1427 op
[1] = new(ctx
) ir_constant(1);
1429 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1431 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1433 ir_rvalue
*temp_rhs
;
1434 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1437 /* Get a temporary of a copy of the lvalue before it's modified.
1438 * This may get thrown away later.
1440 result
= get_lvalue_copy(instructions
, op
[0]->clone(ctx
, NULL
));
1442 (void)do_assignment(instructions
, state
,
1443 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1444 this->subexpressions
[0]->get_location());
1446 error_emitted
= op
[0]->type
->is_error();
1450 case ast_field_selection
:
1451 result
= _mesa_ast_field_selection_to_hir(this, instructions
, state
);
1454 case ast_array_index
: {
1455 YYLTYPE index_loc
= subexpressions
[1]->get_location();
1457 op
[0] = subexpressions
[0]->hir(instructions
, state
);
1458 op
[1] = subexpressions
[1]->hir(instructions
, state
);
1460 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1462 ir_rvalue
*const array
= op
[0];
1464 result
= new(ctx
) ir_dereference_array(op
[0], op
[1]);
1466 /* Do not use op[0] after this point. Use array.
1474 if (!array
->type
->is_array()
1475 && !array
->type
->is_matrix()
1476 && !array
->type
->is_vector()) {
1477 _mesa_glsl_error(& index_loc
, state
,
1478 "cannot dereference non-array / non-matrix / "
1480 error_emitted
= true;
1483 if (!op
[1]->type
->is_integer()) {
1484 _mesa_glsl_error(& index_loc
, state
,
1485 "array index must be integer type");
1486 error_emitted
= true;
1487 } else if (!op
[1]->type
->is_scalar()) {
1488 _mesa_glsl_error(& index_loc
, state
,
1489 "array index must be scalar");
1490 error_emitted
= true;
1493 /* If the array index is a constant expression and the array has a
1494 * declared size, ensure that the access is in-bounds. If the array
1495 * index is not a constant expression, ensure that the array has a
1498 ir_constant
*const const_index
= op
[1]->constant_expression_value();
1499 if (const_index
!= NULL
) {
1500 const int idx
= const_index
->value
.i
[0];
1501 const char *type_name
;
1504 if (array
->type
->is_matrix()) {
1505 type_name
= "matrix";
1506 } else if (array
->type
->is_vector()) {
1507 type_name
= "vector";
1509 type_name
= "array";
1512 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec:
1514 * "It is illegal to declare an array with a size, and then
1515 * later (in the same shader) index the same array with an
1516 * integral constant expression greater than or equal to the
1517 * declared size. It is also illegal to index an array with a
1518 * negative constant expression."
1520 if (array
->type
->is_matrix()) {
1521 if (array
->type
->row_type()->vector_elements
<= idx
) {
1522 bound
= array
->type
->row_type()->vector_elements
;
1524 } else if (array
->type
->is_vector()) {
1525 if (array
->type
->vector_elements
<= idx
) {
1526 bound
= array
->type
->vector_elements
;
1529 if ((array
->type
->array_size() > 0)
1530 && (array
->type
->array_size() <= idx
)) {
1531 bound
= array
->type
->array_size();
1536 _mesa_glsl_error(& loc
, state
, "%s index must be < %u",
1538 error_emitted
= true;
1539 } else if (idx
< 0) {
1540 _mesa_glsl_error(& loc
, state
, "%s index must be >= 0",
1542 error_emitted
= true;
1545 if (array
->type
->is_array()) {
1546 /* If the array is a variable dereference, it dereferences the
1547 * whole array, by definition. Use this to get the variable.
1549 * FINISHME: Should some methods for getting / setting / testing
1550 * FINISHME: array access limits be added to ir_dereference?
1552 ir_variable
*const v
= array
->whole_variable_referenced();
1553 if ((v
!= NULL
) && (unsigned(idx
) > v
->max_array_access
))
1554 v
->max_array_access
= idx
;
1556 } else if (array
->type
->array_size() == 0) {
1557 _mesa_glsl_error(&loc
, state
, "unsized array index must be constant");
1559 if (array
->type
->is_array()) {
1560 /* whole_variable_referenced can return NULL if the array is a
1561 * member of a structure. In this case it is safe to not update
1562 * the max_array_access field because it is never used for fields
1565 ir_variable
*v
= array
->whole_variable_referenced();
1567 v
->max_array_access
= array
->type
->array_size() - 1;
1571 /* From page 23 (29 of the PDF) of the GLSL 1.30 spec:
1573 * "Samplers aggregated into arrays within a shader (using square
1574 * brackets [ ]) can only be indexed with integral constant
1575 * expressions [...]."
1577 * This restriction was added in GLSL 1.30. Shaders using earlier version
1578 * of the language should not be rejected by the compiler front-end for
1579 * using this construct. This allows useful things such as using a loop
1580 * counter as the index to an array of samplers. If the loop in unrolled,
1581 * the code should compile correctly. Instead, emit a warning.
1583 if (array
->type
->is_array() &&
1584 array
->type
->element_type()->is_sampler() &&
1585 const_index
== NULL
) {
1587 if (state
->language_version
== 100) {
1588 _mesa_glsl_warning(&loc
, state
,
1589 "sampler arrays indexed with non-constant "
1590 "expressions is optional in GLSL ES 1.00");
1591 } else if (state
->language_version
< 130) {
1592 _mesa_glsl_warning(&loc
, state
,
1593 "sampler arrays indexed with non-constant "
1594 "expressions is forbidden in GLSL 1.30 and "
1597 _mesa_glsl_error(&loc
, state
,
1598 "sampler arrays indexed with non-constant "
1599 "expressions is forbidden in GLSL 1.30 and "
1601 error_emitted
= true;
1606 result
->type
= glsl_type::error_type
;
1611 case ast_function_call
:
1612 /* Should *NEVER* get here. ast_function_call should always be handled
1613 * by ast_function_expression::hir.
1618 case ast_identifier
: {
1619 /* ast_identifier can appear several places in a full abstract syntax
1620 * tree. This particular use must be at location specified in the grammar
1621 * as 'variable_identifier'.
1624 state
->symbols
->get_variable(this->primary_expression
.identifier
);
1626 result
= new(ctx
) ir_dereference_variable(var
);
1631 _mesa_glsl_error(& loc
, state
, "`%s' undeclared",
1632 this->primary_expression
.identifier
);
1634 error_emitted
= true;
1639 case ast_int_constant
:
1640 result
= new(ctx
) ir_constant(this->primary_expression
.int_constant
);
1643 case ast_uint_constant
:
1644 result
= new(ctx
) ir_constant(this->primary_expression
.uint_constant
);
1647 case ast_float_constant
:
1648 result
= new(ctx
) ir_constant(this->primary_expression
.float_constant
);
1651 case ast_bool_constant
:
1652 result
= new(ctx
) ir_constant(bool(this->primary_expression
.bool_constant
));
1655 case ast_sequence
: {
1656 /* It should not be possible to generate a sequence in the AST without
1657 * any expressions in it.
1659 assert(!this->expressions
.is_empty());
1661 /* The r-value of a sequence is the last expression in the sequence. If
1662 * the other expressions in the sequence do not have side-effects (and
1663 * therefore add instructions to the instruction list), they get dropped
1666 exec_node
*previous_tail_pred
= NULL
;
1667 YYLTYPE previous_operand_loc
= loc
;
1669 foreach_list_typed (ast_node
, ast
, link
, &this->expressions
) {
1670 /* If one of the operands of comma operator does not generate any
1671 * code, we want to emit a warning. At each pass through the loop
1672 * previous_tail_pred will point to the last instruction in the
1673 * stream *before* processing the previous operand. Naturally,
1674 * instructions->tail_pred will point to the last instruction in the
1675 * stream *after* processing the previous operand. If the two
1676 * pointers match, then the previous operand had no effect.
1678 * The warning behavior here differs slightly from GCC. GCC will
1679 * only emit a warning if none of the left-hand operands have an
1680 * effect. However, it will emit a warning for each. I believe that
1681 * there are some cases in C (especially with GCC extensions) where
1682 * it is useful to have an intermediate step in a sequence have no
1683 * effect, but I don't think these cases exist in GLSL. Either way,
1684 * it would be a giant hassle to replicate that behavior.
1686 if (previous_tail_pred
== instructions
->tail_pred
) {
1687 _mesa_glsl_warning(&previous_operand_loc
, state
,
1688 "left-hand operand of comma expression has "
1692 /* tail_pred is directly accessed instead of using the get_tail()
1693 * method for performance reasons. get_tail() has extra code to
1694 * return NULL when the list is empty. We don't care about that
1695 * here, so using tail_pred directly is fine.
1697 previous_tail_pred
= instructions
->tail_pred
;
1698 previous_operand_loc
= ast
->get_location();
1700 result
= ast
->hir(instructions
, state
);
1703 /* Any errors should have already been emitted in the loop above.
1705 error_emitted
= true;
1709 type
= NULL
; /* use result->type, not type. */
1710 assert(result
!= NULL
);
1712 if (result
->type
->is_error() && !error_emitted
)
1713 _mesa_glsl_error(& loc
, state
, "type mismatch");
1720 ast_expression_statement::hir(exec_list
*instructions
,
1721 struct _mesa_glsl_parse_state
*state
)
1723 /* It is possible to have expression statements that don't have an
1724 * expression. This is the solitary semicolon:
1726 * for (i = 0; i < 5; i++)
1729 * In this case the expression will be NULL. Test for NULL and don't do
1730 * anything in that case.
1732 if (expression
!= NULL
)
1733 expression
->hir(instructions
, state
);
1735 /* Statements do not have r-values.
1742 ast_compound_statement::hir(exec_list
*instructions
,
1743 struct _mesa_glsl_parse_state
*state
)
1746 state
->symbols
->push_scope();
1748 foreach_list_typed (ast_node
, ast
, link
, &this->statements
)
1749 ast
->hir(instructions
, state
);
1752 state
->symbols
->pop_scope();
1754 /* Compound statements do not have r-values.
1760 static const glsl_type
*
1761 process_array_type(YYLTYPE
*loc
, const glsl_type
*base
, ast_node
*array_size
,
1762 struct _mesa_glsl_parse_state
*state
)
1764 unsigned length
= 0;
1766 /* FINISHME: Reject delcarations of multidimensional arrays. */
1768 if (array_size
!= NULL
) {
1769 exec_list dummy_instructions
;
1770 ir_rvalue
*const ir
= array_size
->hir(& dummy_instructions
, state
);
1771 YYLTYPE loc
= array_size
->get_location();
1774 if (!ir
->type
->is_integer()) {
1775 _mesa_glsl_error(& loc
, state
, "array size must be integer type");
1776 } else if (!ir
->type
->is_scalar()) {
1777 _mesa_glsl_error(& loc
, state
, "array size must be scalar type");
1779 ir_constant
*const size
= ir
->constant_expression_value();
1782 _mesa_glsl_error(& loc
, state
, "array size must be a "
1783 "constant valued expression");
1784 } else if (size
->value
.i
[0] <= 0) {
1785 _mesa_glsl_error(& loc
, state
, "array size must be > 0");
1787 assert(size
->type
== ir
->type
);
1788 length
= size
->value
.u
[0];
1790 /* If the array size is const (and we've verified that
1791 * it is) then no instructions should have been emitted
1792 * when we converted it to HIR. If they were emitted,
1793 * then either the array size isn't const after all, or
1794 * we are emitting unnecessary instructions.
1796 assert(dummy_instructions
.is_empty());
1800 } else if (state
->es_shader
) {
1801 /* Section 10.17 of the GLSL ES 1.00 specification states that unsized
1802 * array declarations have been removed from the language.
1804 _mesa_glsl_error(loc
, state
, "unsized array declarations are not "
1805 "allowed in GLSL ES 1.00.");
1808 return glsl_type::get_array_instance(base
, length
);
1813 ast_type_specifier::glsl_type(const char **name
,
1814 struct _mesa_glsl_parse_state
*state
) const
1816 const struct glsl_type
*type
;
1818 type
= state
->symbols
->get_type(this->type_name
);
1819 *name
= this->type_name
;
1821 if (this->is_array
) {
1822 YYLTYPE loc
= this->get_location();
1823 type
= process_array_type(&loc
, type
, this->array_size
, state
);
1831 apply_type_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
1833 struct _mesa_glsl_parse_state
*state
,
1836 if (qual
->flags
.q
.invariant
) {
1838 _mesa_glsl_error(loc
, state
,
1839 "variable `%s' may not be redeclared "
1840 "`invariant' after being used",
1847 if (qual
->flags
.q
.constant
|| qual
->flags
.q
.attribute
1848 || qual
->flags
.q
.uniform
1849 || (qual
->flags
.q
.varying
&& (state
->target
== fragment_shader
)))
1852 if (qual
->flags
.q
.centroid
)
1855 if (qual
->flags
.q
.attribute
&& state
->target
!= vertex_shader
) {
1856 var
->type
= glsl_type::error_type
;
1857 _mesa_glsl_error(loc
, state
,
1858 "`attribute' variables may not be declared in the "
1860 _mesa_glsl_shader_target_name(state
->target
));
1863 /* From page 25 (page 31 of the PDF) of the GLSL 1.10 spec:
1865 * "The varying qualifier can be used only with the data types
1866 * float, vec2, vec3, vec4, mat2, mat3, and mat4, or arrays of
1869 if (qual
->flags
.q
.varying
) {
1870 const glsl_type
*non_array_type
;
1872 if (var
->type
&& var
->type
->is_array())
1873 non_array_type
= var
->type
->fields
.array
;
1875 non_array_type
= var
->type
;
1877 if (non_array_type
&& non_array_type
->base_type
!= GLSL_TYPE_FLOAT
) {
1878 var
->type
= glsl_type::error_type
;
1879 _mesa_glsl_error(loc
, state
,
1880 "varying variables must be of base type float");
1884 /* If there is no qualifier that changes the mode of the variable, leave
1885 * the setting alone.
1887 if (qual
->flags
.q
.in
&& qual
->flags
.q
.out
)
1888 var
->mode
= ir_var_inout
;
1889 else if (qual
->flags
.q
.attribute
|| qual
->flags
.q
.in
1890 || (qual
->flags
.q
.varying
&& (state
->target
== fragment_shader
)))
1891 var
->mode
= ir_var_in
;
1892 else if (qual
->flags
.q
.out
1893 || (qual
->flags
.q
.varying
&& (state
->target
== vertex_shader
)))
1894 var
->mode
= ir_var_out
;
1895 else if (qual
->flags
.q
.uniform
)
1896 var
->mode
= ir_var_uniform
;
1898 if (state
->all_invariant
&& (state
->current_function
== NULL
)) {
1899 switch (state
->target
) {
1901 if (var
->mode
== ir_var_out
)
1902 var
->invariant
= true;
1904 case geometry_shader
:
1905 if ((var
->mode
== ir_var_in
) || (var
->mode
== ir_var_out
))
1906 var
->invariant
= true;
1908 case fragment_shader
:
1909 if (var
->mode
== ir_var_in
)
1910 var
->invariant
= true;
1915 if (qual
->flags
.q
.flat
)
1916 var
->interpolation
= ir_var_flat
;
1917 else if (qual
->flags
.q
.noperspective
)
1918 var
->interpolation
= ir_var_noperspective
;
1920 var
->interpolation
= ir_var_smooth
;
1922 var
->pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
1923 var
->origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
1924 if ((qual
->flags
.q
.origin_upper_left
|| qual
->flags
.q
.pixel_center_integer
)
1925 && (strcmp(var
->name
, "gl_FragCoord") != 0)) {
1926 const char *const qual_string
= (qual
->flags
.q
.origin_upper_left
)
1927 ? "origin_upper_left" : "pixel_center_integer";
1929 _mesa_glsl_error(loc
, state
,
1930 "layout qualifier `%s' can only be applied to "
1931 "fragment shader input `gl_FragCoord'",
1935 if (qual
->flags
.q
.explicit_location
) {
1936 const bool global_scope
= (state
->current_function
== NULL
);
1938 const char *string
= "";
1940 /* In the vertex shader only shader inputs can be given explicit
1943 * In the fragment shader only shader outputs can be given explicit
1946 switch (state
->target
) {
1948 if (!global_scope
|| (var
->mode
!= ir_var_in
)) {
1954 case geometry_shader
:
1955 _mesa_glsl_error(loc
, state
,
1956 "geometry shader variables cannot be given "
1957 "explicit locations\n");
1960 case fragment_shader
:
1961 if (!global_scope
|| (var
->mode
!= ir_var_out
)) {
1969 _mesa_glsl_error(loc
, state
,
1970 "only %s shader %s variables can be given an "
1971 "explicit location\n",
1972 _mesa_glsl_shader_target_name(state
->target
),
1975 var
->explicit_location
= true;
1977 /* This bit of silliness is needed because invalid explicit locations
1978 * are supposed to be flagged during linking. Small negative values
1979 * biased by VERT_ATTRIB_GENERIC0 or FRAG_RESULT_DATA0 could alias
1980 * built-in values (e.g., -16+VERT_ATTRIB_GENERIC0 = VERT_ATTRIB_POS).
1981 * The linker needs to be able to differentiate these cases. This
1982 * ensures that negative values stay negative.
1984 if (qual
->location
>= 0) {
1985 var
->location
= (state
->target
== vertex_shader
)
1986 ? (qual
->location
+ VERT_ATTRIB_GENERIC0
)
1987 : (qual
->location
+ FRAG_RESULT_DATA0
);
1989 var
->location
= qual
->location
;
1994 /* Does the declaration use the 'layout' keyword?
1996 const bool uses_layout
= qual
->flags
.q
.pixel_center_integer
1997 || qual
->flags
.q
.origin_upper_left
1998 || qual
->flags
.q
.explicit_location
;
2000 /* Does the declaration use the deprecated 'attribute' or 'varying'
2003 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
2004 || qual
->flags
.q
.varying
;
2006 /* Is the 'layout' keyword used with parameters that allow relaxed checking.
2007 * Many implementations of GL_ARB_fragment_coord_conventions_enable and some
2008 * implementations (only Mesa?) GL_ARB_explicit_attrib_location_enable
2009 * allowed the layout qualifier to be used with 'varying' and 'attribute'.
2010 * These extensions and all following extensions that add the 'layout'
2011 * keyword have been modified to require the use of 'in' or 'out'.
2013 * The following extension do not allow the deprecated keywords:
2015 * GL_AMD_conservative_depth
2016 * GL_ARB_gpu_shader5
2017 * GL_ARB_separate_shader_objects
2018 * GL_ARB_tesselation_shader
2019 * GL_ARB_transform_feedback3
2020 * GL_ARB_uniform_buffer_object
2022 * It is unknown whether GL_EXT_shader_image_load_store or GL_NV_gpu_shader5
2023 * allow layout with the deprecated keywords.
2025 const bool relaxed_layout_qualifier_checking
=
2026 state
->ARB_fragment_coord_conventions_enable
;
2028 if (uses_layout
&& uses_deprecated_qualifier
) {
2029 if (relaxed_layout_qualifier_checking
) {
2030 _mesa_glsl_warning(loc
, state
,
2031 "`layout' qualifier may not be used with "
2032 "`attribute' or `varying'");
2034 _mesa_glsl_error(loc
, state
,
2035 "`layout' qualifier may not be used with "
2036 "`attribute' or `varying'");
2040 /* Layout qualifiers for gl_FragDepth, which are enabled by extension
2041 * AMD_conservative_depth.
2043 int depth_layout_count
= qual
->flags
.q
.depth_any
2044 + qual
->flags
.q
.depth_greater
2045 + qual
->flags
.q
.depth_less
2046 + qual
->flags
.q
.depth_unchanged
;
2047 if (depth_layout_count
> 0
2048 && !state
->AMD_conservative_depth_enable
) {
2049 _mesa_glsl_error(loc
, state
,
2050 "extension GL_AMD_conservative_depth must be enabled "
2051 "to use depth layout qualifiers");
2052 } else if (depth_layout_count
> 0
2053 && strcmp(var
->name
, "gl_FragDepth") != 0) {
2054 _mesa_glsl_error(loc
, state
,
2055 "depth layout qualifiers can be applied only to "
2057 } else if (depth_layout_count
> 1
2058 && strcmp(var
->name
, "gl_FragDepth") == 0) {
2059 _mesa_glsl_error(loc
, state
,
2060 "at most one depth layout qualifier can be applied to "
2063 if (qual
->flags
.q
.depth_any
)
2064 var
->depth_layout
= ir_depth_layout_any
;
2065 else if (qual
->flags
.q
.depth_greater
)
2066 var
->depth_layout
= ir_depth_layout_greater
;
2067 else if (qual
->flags
.q
.depth_less
)
2068 var
->depth_layout
= ir_depth_layout_less
;
2069 else if (qual
->flags
.q
.depth_unchanged
)
2070 var
->depth_layout
= ir_depth_layout_unchanged
;
2072 var
->depth_layout
= ir_depth_layout_none
;
2074 if (var
->type
->is_array() && state
->language_version
!= 110) {
2075 var
->array_lvalue
= true;
2080 * Get the variable that is being redeclared by this declaration
2082 * Semantic checks to verify the validity of the redeclaration are also
2083 * performed. If semantic checks fail, compilation error will be emitted via
2084 * \c _mesa_glsl_error, but a non-\c NULL pointer will still be returned.
2087 * A pointer to an existing variable in the current scope if the declaration
2088 * is a redeclaration, \c NULL otherwise.
2091 get_variable_being_redeclared(ir_variable
*var
, ast_declaration
*decl
,
2092 struct _mesa_glsl_parse_state
*state
)
2094 /* Check if this declaration is actually a re-declaration, either to
2095 * resize an array or add qualifiers to an existing variable.
2097 * This is allowed for variables in the current scope, or when at
2098 * global scope (for built-ins in the implicit outer scope).
2100 ir_variable
*earlier
= state
->symbols
->get_variable(decl
->identifier
);
2101 if (earlier
== NULL
||
2102 (state
->current_function
!= NULL
&&
2103 !state
->symbols
->name_declared_this_scope(decl
->identifier
))) {
2108 YYLTYPE loc
= decl
->get_location();
2110 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec,
2112 * "It is legal to declare an array without a size and then
2113 * later re-declare the same name as an array of the same
2114 * type and specify a size."
2116 if ((earlier
->type
->array_size() == 0)
2117 && var
->type
->is_array()
2118 && (var
->type
->element_type() == earlier
->type
->element_type())) {
2119 /* FINISHME: This doesn't match the qualifiers on the two
2120 * FINISHME: declarations. It's not 100% clear whether this is
2121 * FINISHME: required or not.
2124 /* From page 54 (page 60 of the PDF) of the GLSL 1.20 spec:
2126 * "The size [of gl_TexCoord] can be at most
2127 * gl_MaxTextureCoords."
2129 const unsigned size
= unsigned(var
->type
->array_size());
2130 if ((strcmp("gl_TexCoord", var
->name
) == 0)
2131 && (size
> state
->Const
.MaxTextureCoords
)) {
2132 _mesa_glsl_error(& loc
, state
, "`gl_TexCoord' array size cannot "
2133 "be larger than gl_MaxTextureCoords (%u)\n",
2134 state
->Const
.MaxTextureCoords
);
2135 } else if ((size
> 0) && (size
<= earlier
->max_array_access
)) {
2136 _mesa_glsl_error(& loc
, state
, "array size must be > %u due to "
2138 earlier
->max_array_access
);
2141 earlier
->type
= var
->type
;
2144 } else if (state
->ARB_fragment_coord_conventions_enable
2145 && strcmp(var
->name
, "gl_FragCoord") == 0
2146 && earlier
->type
== var
->type
2147 && earlier
->mode
== var
->mode
) {
2148 /* Allow redeclaration of gl_FragCoord for ARB_fcc layout
2151 earlier
->origin_upper_left
= var
->origin_upper_left
;
2152 earlier
->pixel_center_integer
= var
->pixel_center_integer
;
2154 /* According to section 4.3.7 of the GLSL 1.30 spec,
2155 * the following built-in varaibles can be redeclared with an
2156 * interpolation qualifier:
2159 * * gl_FrontSecondaryColor
2160 * * gl_BackSecondaryColor
2162 * * gl_SecondaryColor
2164 } else if (state
->language_version
>= 130
2165 && (strcmp(var
->name
, "gl_FrontColor") == 0
2166 || strcmp(var
->name
, "gl_BackColor") == 0
2167 || strcmp(var
->name
, "gl_FrontSecondaryColor") == 0
2168 || strcmp(var
->name
, "gl_BackSecondaryColor") == 0
2169 || strcmp(var
->name
, "gl_Color") == 0
2170 || strcmp(var
->name
, "gl_SecondaryColor") == 0)
2171 && earlier
->type
== var
->type
2172 && earlier
->mode
== var
->mode
) {
2173 earlier
->interpolation
= var
->interpolation
;
2175 /* Layout qualifiers for gl_FragDepth. */
2176 } else if (state
->AMD_conservative_depth_enable
2177 && strcmp(var
->name
, "gl_FragDepth") == 0
2178 && earlier
->type
== var
->type
2179 && earlier
->mode
== var
->mode
) {
2181 /** From the AMD_conservative_depth spec:
2182 * Within any shader, the first redeclarations of gl_FragDepth
2183 * must appear before any use of gl_FragDepth.
2185 if (earlier
->used
) {
2186 _mesa_glsl_error(&loc
, state
,
2187 "the first redeclaration of gl_FragDepth "
2188 "must appear before any use of gl_FragDepth");
2191 /* Prevent inconsistent redeclaration of depth layout qualifier. */
2192 if (earlier
->depth_layout
!= ir_depth_layout_none
2193 && earlier
->depth_layout
!= var
->depth_layout
) {
2194 _mesa_glsl_error(&loc
, state
,
2195 "gl_FragDepth: depth layout is declared here "
2196 "as '%s, but it was previously declared as "
2198 depth_layout_string(var
->depth_layout
),
2199 depth_layout_string(earlier
->depth_layout
));
2202 earlier
->depth_layout
= var
->depth_layout
;
2205 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", decl
->identifier
);
2212 * Generate the IR for an initializer in a variable declaration
2215 process_initializer(ir_variable
*var
, ast_declaration
*decl
,
2216 ast_fully_specified_type
*type
,
2217 exec_list
*initializer_instructions
,
2218 struct _mesa_glsl_parse_state
*state
)
2220 ir_rvalue
*result
= NULL
;
2222 YYLTYPE initializer_loc
= decl
->initializer
->get_location();
2224 /* From page 24 (page 30 of the PDF) of the GLSL 1.10 spec:
2226 * "All uniform variables are read-only and are initialized either
2227 * directly by an application via API commands, or indirectly by
2230 if ((state
->language_version
<= 110)
2231 && (var
->mode
== ir_var_uniform
)) {
2232 _mesa_glsl_error(& initializer_loc
, state
,
2233 "cannot initialize uniforms in GLSL 1.10");
2236 if (var
->type
->is_sampler()) {
2237 _mesa_glsl_error(& initializer_loc
, state
,
2238 "cannot initialize samplers");
2241 if ((var
->mode
== ir_var_in
) && (state
->current_function
== NULL
)) {
2242 _mesa_glsl_error(& initializer_loc
, state
,
2243 "cannot initialize %s shader input / %s",
2244 _mesa_glsl_shader_target_name(state
->target
),
2245 (state
->target
== vertex_shader
)
2246 ? "attribute" : "varying");
2249 ir_dereference
*const lhs
= new(state
) ir_dereference_variable(var
);
2250 ir_rvalue
*rhs
= decl
->initializer
->hir(initializer_instructions
,
2253 /* Calculate the constant value if this is a const or uniform
2256 if (type
->qualifier
.flags
.q
.constant
2257 || type
->qualifier
.flags
.q
.uniform
) {
2258 ir_rvalue
*new_rhs
= validate_assignment(state
, var
->type
, rhs
, true);
2259 if (new_rhs
!= NULL
) {
2262 ir_constant
*constant_value
= rhs
->constant_expression_value();
2263 if (!constant_value
) {
2264 _mesa_glsl_error(& initializer_loc
, state
,
2265 "initializer of %s variable `%s' must be a "
2266 "constant expression",
2267 (type
->qualifier
.flags
.q
.constant
)
2268 ? "const" : "uniform",
2270 if (var
->type
->is_numeric()) {
2271 /* Reduce cascading errors. */
2272 var
->constant_value
= ir_constant::zero(state
, var
->type
);
2275 rhs
= constant_value
;
2276 var
->constant_value
= constant_value
;
2279 _mesa_glsl_error(&initializer_loc
, state
,
2280 "initializer of type %s cannot be assigned to "
2281 "variable of type %s",
2282 rhs
->type
->name
, var
->type
->name
);
2283 if (var
->type
->is_numeric()) {
2284 /* Reduce cascading errors. */
2285 var
->constant_value
= ir_constant::zero(state
, var
->type
);
2290 if (rhs
&& !rhs
->type
->is_error()) {
2291 bool temp
= var
->read_only
;
2292 if (type
->qualifier
.flags
.q
.constant
)
2293 var
->read_only
= false;
2295 /* Never emit code to initialize a uniform.
2297 const glsl_type
*initializer_type
;
2298 if (!type
->qualifier
.flags
.q
.uniform
) {
2299 result
= do_assignment(initializer_instructions
, state
,
2301 type
->get_location());
2302 initializer_type
= result
->type
;
2304 initializer_type
= rhs
->type
;
2306 /* If the declared variable is an unsized array, it must inherrit
2307 * its full type from the initializer. A declaration such as
2309 * uniform float a[] = float[](1.0, 2.0, 3.0, 3.0);
2313 * uniform float a[4] = float[](1.0, 2.0, 3.0, 3.0);
2315 * The assignment generated in the if-statement (below) will also
2316 * automatically handle this case for non-uniforms.
2318 * If the declared variable is not an array, the types must
2319 * already match exactly. As a result, the type assignment
2320 * here can be done unconditionally. For non-uniforms the call
2321 * to do_assignment can change the type of the initializer (via
2322 * the implicit conversion rules). For uniforms the initializer
2323 * must be a constant expression, and the type of that expression
2324 * was validated above.
2326 var
->type
= initializer_type
;
2328 var
->read_only
= temp
;
2335 ast_declarator_list::hir(exec_list
*instructions
,
2336 struct _mesa_glsl_parse_state
*state
)
2339 const struct glsl_type
*decl_type
;
2340 const char *type_name
= NULL
;
2341 ir_rvalue
*result
= NULL
;
2342 YYLTYPE loc
= this->get_location();
2344 /* From page 46 (page 52 of the PDF) of the GLSL 1.50 spec:
2346 * "To ensure that a particular output variable is invariant, it is
2347 * necessary to use the invariant qualifier. It can either be used to
2348 * qualify a previously declared variable as being invariant
2350 * invariant gl_Position; // make existing gl_Position be invariant"
2352 * In these cases the parser will set the 'invariant' flag in the declarator
2353 * list, and the type will be NULL.
2355 if (this->invariant
) {
2356 assert(this->type
== NULL
);
2358 if (state
->current_function
!= NULL
) {
2359 _mesa_glsl_error(& loc
, state
,
2360 "All uses of `invariant' keyword must be at global "
2364 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
2365 assert(!decl
->is_array
);
2366 assert(decl
->array_size
== NULL
);
2367 assert(decl
->initializer
== NULL
);
2369 ir_variable
*const earlier
=
2370 state
->symbols
->get_variable(decl
->identifier
);
2371 if (earlier
== NULL
) {
2372 _mesa_glsl_error(& loc
, state
,
2373 "Undeclared variable `%s' cannot be marked "
2374 "invariant\n", decl
->identifier
);
2375 } else if ((state
->target
== vertex_shader
)
2376 && (earlier
->mode
!= ir_var_out
)) {
2377 _mesa_glsl_error(& loc
, state
,
2378 "`%s' cannot be marked invariant, vertex shader "
2379 "outputs only\n", decl
->identifier
);
2380 } else if ((state
->target
== fragment_shader
)
2381 && (earlier
->mode
!= ir_var_in
)) {
2382 _mesa_glsl_error(& loc
, state
,
2383 "`%s' cannot be marked invariant, fragment shader "
2384 "inputs only\n", decl
->identifier
);
2385 } else if (earlier
->used
) {
2386 _mesa_glsl_error(& loc
, state
,
2387 "variable `%s' may not be redeclared "
2388 "`invariant' after being used",
2391 earlier
->invariant
= true;
2395 /* Invariant redeclarations do not have r-values.
2400 assert(this->type
!= NULL
);
2401 assert(!this->invariant
);
2403 /* The type specifier may contain a structure definition. Process that
2404 * before any of the variable declarations.
2406 (void) this->type
->specifier
->hir(instructions
, state
);
2408 decl_type
= this->type
->specifier
->glsl_type(& type_name
, state
);
2409 if (this->declarations
.is_empty()) {
2410 if (decl_type
!= NULL
) {
2411 /* Warn if this empty declaration is not for declaring a structure.
2413 if (this->type
->specifier
->structure
== NULL
) {
2414 _mesa_glsl_warning(&loc
, state
, "empty declaration");
2417 _mesa_glsl_error(& loc
, state
, "incomplete declaration");
2421 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
2422 const struct glsl_type
*var_type
;
2425 /* FINISHME: Emit a warning if a variable declaration shadows a
2426 * FINISHME: declaration at a higher scope.
2429 if ((decl_type
== NULL
) || decl_type
->is_void()) {
2430 if (type_name
!= NULL
) {
2431 _mesa_glsl_error(& loc
, state
,
2432 "invalid type `%s' in declaration of `%s'",
2433 type_name
, decl
->identifier
);
2435 _mesa_glsl_error(& loc
, state
,
2436 "invalid type in declaration of `%s'",
2442 if (decl
->is_array
) {
2443 var_type
= process_array_type(&loc
, decl_type
, decl
->array_size
,
2446 var_type
= decl_type
;
2449 var
= new(ctx
) ir_variable(var_type
, decl
->identifier
, ir_var_auto
);
2451 /* From page 22 (page 28 of the PDF) of the GLSL 1.10 specification;
2453 * "Global variables can only use the qualifiers const,
2454 * attribute, uni form, or varying. Only one may be
2457 * Local variables can only use the qualifier const."
2459 * This is relaxed in GLSL 1.30. It is also relaxed by any extension
2460 * that adds the 'layout' keyword.
2462 if ((state
->language_version
< 130)
2463 && !state
->ARB_explicit_attrib_location_enable
2464 && !state
->ARB_fragment_coord_conventions_enable
) {
2465 if (this->type
->qualifier
.flags
.q
.out
) {
2466 _mesa_glsl_error(& loc
, state
,
2467 "`out' qualifier in declaration of `%s' "
2468 "only valid for function parameters in %s.",
2469 decl
->identifier
, state
->version_string
);
2471 if (this->type
->qualifier
.flags
.q
.in
) {
2472 _mesa_glsl_error(& loc
, state
,
2473 "`in' qualifier in declaration of `%s' "
2474 "only valid for function parameters in %s.",
2475 decl
->identifier
, state
->version_string
);
2477 /* FINISHME: Test for other invalid qualifiers. */
2480 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
,
2483 if (this->type
->qualifier
.flags
.q
.invariant
) {
2484 if ((state
->target
== vertex_shader
) && !(var
->mode
== ir_var_out
||
2485 var
->mode
== ir_var_inout
)) {
2486 /* FINISHME: Note that this doesn't work for invariant on
2487 * a function signature outval
2489 _mesa_glsl_error(& loc
, state
,
2490 "`%s' cannot be marked invariant, vertex shader "
2491 "outputs only\n", var
->name
);
2492 } else if ((state
->target
== fragment_shader
) &&
2493 !(var
->mode
== ir_var_in
|| var
->mode
== ir_var_inout
)) {
2494 /* FINISHME: Note that this doesn't work for invariant on
2495 * a function signature inval
2497 _mesa_glsl_error(& loc
, state
,
2498 "`%s' cannot be marked invariant, fragment shader "
2499 "inputs only\n", var
->name
);
2503 if (state
->current_function
!= NULL
) {
2504 const char *mode
= NULL
;
2505 const char *extra
= "";
2507 /* There is no need to check for 'inout' here because the parser will
2508 * only allow that in function parameter lists.
2510 if (this->type
->qualifier
.flags
.q
.attribute
) {
2512 } else if (this->type
->qualifier
.flags
.q
.uniform
) {
2514 } else if (this->type
->qualifier
.flags
.q
.varying
) {
2516 } else if (this->type
->qualifier
.flags
.q
.in
) {
2518 extra
= " or in function parameter list";
2519 } else if (this->type
->qualifier
.flags
.q
.out
) {
2521 extra
= " or in function parameter list";
2525 _mesa_glsl_error(& loc
, state
,
2526 "%s variable `%s' must be declared at "
2528 mode
, var
->name
, extra
);
2530 } else if (var
->mode
== ir_var_in
) {
2531 var
->read_only
= true;
2533 if (state
->target
== vertex_shader
) {
2534 bool error_emitted
= false;
2536 /* From page 31 (page 37 of the PDF) of the GLSL 1.50 spec:
2538 * "Vertex shader inputs can only be float, floating-point
2539 * vectors, matrices, signed and unsigned integers and integer
2540 * vectors. Vertex shader inputs can also form arrays of these
2541 * types, but not structures."
2543 * From page 31 (page 27 of the PDF) of the GLSL 1.30 spec:
2545 * "Vertex shader inputs can only be float, floating-point
2546 * vectors, matrices, signed and unsigned integers and integer
2547 * vectors. They cannot be arrays or structures."
2549 * From page 23 (page 29 of the PDF) of the GLSL 1.20 spec:
2551 * "The attribute qualifier can be used only with float,
2552 * floating-point vectors, and matrices. Attribute variables
2553 * cannot be declared as arrays or structures."
2555 const glsl_type
*check_type
= var
->type
->is_array()
2556 ? var
->type
->fields
.array
: var
->type
;
2558 switch (check_type
->base_type
) {
2559 case GLSL_TYPE_FLOAT
:
2561 case GLSL_TYPE_UINT
:
2563 if (state
->language_version
> 120)
2567 _mesa_glsl_error(& loc
, state
,
2568 "vertex shader input / attribute cannot have "
2570 var
->type
->is_array() ? "array of " : "",
2572 error_emitted
= true;
2575 if (!error_emitted
&& (state
->language_version
<= 130)
2576 && var
->type
->is_array()) {
2577 _mesa_glsl_error(& loc
, state
,
2578 "vertex shader input / attribute cannot have "
2580 error_emitted
= true;
2585 /* Integer vertex outputs must be qualified with 'flat'.
2587 * From section 4.3.6 of the GLSL 1.30 spec:
2588 * "If a vertex output is a signed or unsigned integer or integer
2589 * vector, then it must be qualified with the interpolation qualifier
2592 if (state
->language_version
>= 130
2593 && state
->target
== vertex_shader
2594 && state
->current_function
== NULL
2595 && var
->type
->is_integer()
2596 && var
->mode
== ir_var_out
2597 && var
->interpolation
!= ir_var_flat
) {
2599 _mesa_glsl_error(&loc
, state
, "If a vertex output is an integer, "
2600 "then it must be qualified with 'flat'");
2604 /* Interpolation qualifiers cannot be applied to 'centroid' and
2605 * 'centroid varying'.
2607 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
2608 * "interpolation qualifiers may only precede the qualifiers in,
2609 * centroid in, out, or centroid out in a declaration. They do not apply
2610 * to the deprecated storage qualifiers varying or centroid varying."
2612 if (state
->language_version
>= 130
2613 && this->type
->qualifier
.has_interpolation()
2614 && this->type
->qualifier
.flags
.q
.varying
) {
2616 const char *i
= this->type
->qualifier
.interpolation_string();
2619 if (this->type
->qualifier
.flags
.q
.centroid
)
2620 s
= "centroid varying";
2624 _mesa_glsl_error(&loc
, state
,
2625 "qualifier '%s' cannot be applied to the "
2626 "deprecated storage qualifier '%s'", i
, s
);
2630 /* Interpolation qualifiers can only apply to vertex shader outputs and
2631 * fragment shader inputs.
2633 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
2634 * "Outputs from a vertex shader (out) and inputs to a fragment
2635 * shader (in) can be further qualified with one or more of these
2636 * interpolation qualifiers"
2638 if (state
->language_version
>= 130
2639 && this->type
->qualifier
.has_interpolation()) {
2641 const char *i
= this->type
->qualifier
.interpolation_string();
2644 switch (state
->target
) {
2646 if (this->type
->qualifier
.flags
.q
.in
) {
2647 _mesa_glsl_error(&loc
, state
,
2648 "qualifier '%s' cannot be applied to vertex "
2649 "shader inputs", i
);
2652 case fragment_shader
:
2653 if (this->type
->qualifier
.flags
.q
.out
) {
2654 _mesa_glsl_error(&loc
, state
,
2655 "qualifier '%s' cannot be applied to fragment "
2656 "shader outputs", i
);
2665 /* From section 4.3.4 of the GLSL 1.30 spec:
2666 * "It is an error to use centroid in in a vertex shader."
2668 if (state
->language_version
>= 130
2669 && this->type
->qualifier
.flags
.q
.centroid
2670 && this->type
->qualifier
.flags
.q
.in
2671 && state
->target
== vertex_shader
) {
2673 _mesa_glsl_error(&loc
, state
,
2674 "'centroid in' cannot be used in a vertex shader");
2678 /* Precision qualifiers exists only in GLSL versions 1.00 and >= 1.30.
2680 if (this->type
->specifier
->precision
!= ast_precision_none
2681 && state
->language_version
!= 100
2682 && state
->language_version
< 130) {
2684 _mesa_glsl_error(&loc
, state
,
2685 "precision qualifiers are supported only in GLSL ES "
2686 "1.00, and GLSL 1.30 and later");
2690 /* Precision qualifiers only apply to floating point and integer types.
2692 * From section 4.5.2 of the GLSL 1.30 spec:
2693 * "Any floating point or any integer declaration can have the type
2694 * preceded by one of these precision qualifiers [...] Literal
2695 * constants do not have precision qualifiers. Neither do Boolean
2698 * In GLSL ES, sampler types are also allowed.
2700 * From page 87 of the GLSL ES spec:
2701 * "RESOLUTION: Allow sampler types to take a precision qualifier."
2703 if (this->type
->specifier
->precision
!= ast_precision_none
2704 && !var
->type
->is_float()
2705 && !var
->type
->is_integer()
2706 && !(var
->type
->is_sampler() && state
->es_shader
)
2707 && !(var
->type
->is_array()
2708 && (var
->type
->fields
.array
->is_float()
2709 || var
->type
->fields
.array
->is_integer()))) {
2711 _mesa_glsl_error(&loc
, state
,
2712 "precision qualifiers apply only to floating point"
2713 "%s types", state
->es_shader
? ", integer, and sampler"
2717 /* From page 17 (page 23 of the PDF) of the GLSL 1.20 spec:
2719 * "[Sampler types] can only be declared as function
2720 * parameters or uniform variables (see Section 4.3.5
2723 if (var_type
->contains_sampler() &&
2724 !this->type
->qualifier
.flags
.q
.uniform
) {
2725 _mesa_glsl_error(&loc
, state
, "samplers must be declared uniform");
2728 /* Process the initializer and add its instructions to a temporary
2729 * list. This list will be added to the instruction stream (below) after
2730 * the declaration is added. This is done because in some cases (such as
2731 * redeclarations) the declaration may not actually be added to the
2732 * instruction stream.
2734 exec_list initializer_instructions
;
2735 ir_variable
*earlier
= get_variable_being_redeclared(var
, decl
, state
);
2737 if (decl
->initializer
!= NULL
) {
2738 result
= process_initializer((earlier
== NULL
) ? var
: earlier
,
2740 &initializer_instructions
, state
);
2743 /* From page 23 (page 29 of the PDF) of the GLSL 1.10 spec:
2745 * "It is an error to write to a const variable outside of
2746 * its declaration, so they must be initialized when
2749 if (this->type
->qualifier
.flags
.q
.constant
&& decl
->initializer
== NULL
) {
2750 _mesa_glsl_error(& loc
, state
,
2751 "const declaration of `%s' must be initialized",
2755 /* If the declaration is not a redeclaration, there are a few additional
2756 * semantic checks that must be applied. In addition, variable that was
2757 * created for the declaration should be added to the IR stream.
2759 if (earlier
== NULL
) {
2760 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
2762 * "Identifiers starting with "gl_" are reserved for use by
2763 * OpenGL, and may not be declared in a shader as either a
2764 * variable or a function."
2766 if (strncmp(decl
->identifier
, "gl_", 3) == 0)
2767 _mesa_glsl_error(& loc
, state
,
2768 "identifier `%s' uses reserved `gl_' prefix",
2771 /* Add the variable to the symbol table. Note that the initializer's
2772 * IR was already processed earlier (though it hasn't been emitted
2773 * yet), without the variable in scope.
2775 * This differs from most C-like languages, but it follows the GLSL
2776 * specification. From page 28 (page 34 of the PDF) of the GLSL 1.50
2779 * "Within a declaration, the scope of a name starts immediately
2780 * after the initializer if present or immediately after the name
2781 * being declared if not."
2783 if (!state
->symbols
->add_variable(var
)) {
2784 YYLTYPE loc
= this->get_location();
2785 _mesa_glsl_error(&loc
, state
, "name `%s' already taken in the "
2786 "current scope", decl
->identifier
);
2790 /* Push the variable declaration to the top. It means that all the
2791 * variable declarations will appear in a funny last-to-first order,
2792 * but otherwise we run into trouble if a function is prototyped, a
2793 * global var is decled, then the function is defined with usage of
2794 * the global var. See glslparsertest's CorrectModule.frag.
2796 instructions
->push_head(var
);
2799 instructions
->append_list(&initializer_instructions
);
2803 /* Generally, variable declarations do not have r-values. However,
2804 * one is used for the declaration in
2806 * while (bool b = some_condition()) {
2810 * so we return the rvalue from the last seen declaration here.
2817 ast_parameter_declarator::hir(exec_list
*instructions
,
2818 struct _mesa_glsl_parse_state
*state
)
2821 const struct glsl_type
*type
;
2822 const char *name
= NULL
;
2823 YYLTYPE loc
= this->get_location();
2825 type
= this->type
->specifier
->glsl_type(& name
, state
);
2829 _mesa_glsl_error(& loc
, state
,
2830 "invalid type `%s' in declaration of `%s'",
2831 name
, this->identifier
);
2833 _mesa_glsl_error(& loc
, state
,
2834 "invalid type in declaration of `%s'",
2838 type
= glsl_type::error_type
;
2841 /* From page 62 (page 68 of the PDF) of the GLSL 1.50 spec:
2843 * "Functions that accept no input arguments need not use void in the
2844 * argument list because prototypes (or definitions) are required and
2845 * therefore there is no ambiguity when an empty argument list "( )" is
2846 * declared. The idiom "(void)" as a parameter list is provided for
2849 * Placing this check here prevents a void parameter being set up
2850 * for a function, which avoids tripping up checks for main taking
2851 * parameters and lookups of an unnamed symbol.
2853 if (type
->is_void()) {
2854 if (this->identifier
!= NULL
)
2855 _mesa_glsl_error(& loc
, state
,
2856 "named parameter cannot have type `void'");
2862 if (formal_parameter
&& (this->identifier
== NULL
)) {
2863 _mesa_glsl_error(& loc
, state
, "formal parameter lacks a name");
2867 /* This only handles "vec4 foo[..]". The earlier specifier->glsl_type(...)
2868 * call already handled the "vec4[..] foo" case.
2870 if (this->is_array
) {
2871 type
= process_array_type(&loc
, type
, this->array_size
, state
);
2874 if (type
->array_size() == 0) {
2875 _mesa_glsl_error(&loc
, state
, "arrays passed as parameters must have "
2876 "a declared size.");
2877 type
= glsl_type::error_type
;
2881 ir_variable
*var
= new(ctx
) ir_variable(type
, this->identifier
, ir_var_in
);
2883 /* Apply any specified qualifiers to the parameter declaration. Note that
2884 * for function parameters the default mode is 'in'.
2886 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
, & loc
);
2888 /* From page 17 (page 23 of the PDF) of the GLSL 1.20 spec:
2890 * "Samplers cannot be treated as l-values; hence cannot be used
2891 * as out or inout function parameters, nor can they be assigned
2894 if ((var
->mode
== ir_var_inout
|| var
->mode
== ir_var_out
)
2895 && type
->contains_sampler()) {
2896 _mesa_glsl_error(&loc
, state
, "out and inout parameters cannot contain samplers");
2897 type
= glsl_type::error_type
;
2900 instructions
->push_tail(var
);
2902 /* Parameter declarations do not have r-values.
2909 ast_parameter_declarator::parameters_to_hir(exec_list
*ast_parameters
,
2911 exec_list
*ir_parameters
,
2912 _mesa_glsl_parse_state
*state
)
2914 ast_parameter_declarator
*void_param
= NULL
;
2917 foreach_list_typed (ast_parameter_declarator
, param
, link
, ast_parameters
) {
2918 param
->formal_parameter
= formal
;
2919 param
->hir(ir_parameters
, state
);
2927 if ((void_param
!= NULL
) && (count
> 1)) {
2928 YYLTYPE loc
= void_param
->get_location();
2930 _mesa_glsl_error(& loc
, state
,
2931 "`void' parameter must be only parameter");
2937 emit_function(_mesa_glsl_parse_state
*state
, ir_function
*f
)
2939 /* IR invariants disallow function declarations or definitions
2940 * nested within other function definitions. But there is no
2941 * requirement about the relative order of function declarations
2942 * and definitions with respect to one another. So simply insert
2943 * the new ir_function block at the end of the toplevel instruction
2946 state
->toplevel_ir
->push_tail(f
);
2951 ast_function::hir(exec_list
*instructions
,
2952 struct _mesa_glsl_parse_state
*state
)
2955 ir_function
*f
= NULL
;
2956 ir_function_signature
*sig
= NULL
;
2957 exec_list hir_parameters
;
2959 const char *const name
= identifier
;
2961 /* From page 21 (page 27 of the PDF) of the GLSL 1.20 spec,
2963 * "Function declarations (prototypes) cannot occur inside of functions;
2964 * they must be at global scope, or for the built-in functions, outside
2965 * the global scope."
2967 * From page 27 (page 33 of the PDF) of the GLSL ES 1.00.16 spec,
2969 * "User defined functions may only be defined within the global scope."
2971 * Note that this language does not appear in GLSL 1.10.
2973 if ((state
->current_function
!= NULL
) && (state
->language_version
!= 110)) {
2974 YYLTYPE loc
= this->get_location();
2975 _mesa_glsl_error(&loc
, state
,
2976 "declaration of function `%s' not allowed within "
2977 "function body", name
);
2980 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
2982 * "Identifiers starting with "gl_" are reserved for use by
2983 * OpenGL, and may not be declared in a shader as either a
2984 * variable or a function."
2986 if (strncmp(name
, "gl_", 3) == 0) {
2987 YYLTYPE loc
= this->get_location();
2988 _mesa_glsl_error(&loc
, state
,
2989 "identifier `%s' uses reserved `gl_' prefix", name
);
2992 /* Convert the list of function parameters to HIR now so that they can be
2993 * used below to compare this function's signature with previously seen
2994 * signatures for functions with the same name.
2996 ast_parameter_declarator::parameters_to_hir(& this->parameters
,
2998 & hir_parameters
, state
);
3000 const char *return_type_name
;
3001 const glsl_type
*return_type
=
3002 this->return_type
->specifier
->glsl_type(& return_type_name
, state
);
3005 YYLTYPE loc
= this->get_location();
3006 _mesa_glsl_error(&loc
, state
,
3007 "function `%s' has undeclared return type `%s'",
3008 name
, return_type_name
);
3009 return_type
= glsl_type::error_type
;
3012 /* From page 56 (page 62 of the PDF) of the GLSL 1.30 spec:
3013 * "No qualifier is allowed on the return type of a function."
3015 if (this->return_type
->has_qualifiers()) {
3016 YYLTYPE loc
= this->get_location();
3017 _mesa_glsl_error(& loc
, state
,
3018 "function `%s' return type has qualifiers", name
);
3021 /* From page 17 (page 23 of the PDF) of the GLSL 1.20 spec:
3023 * "[Sampler types] can only be declared as function parameters
3024 * or uniform variables (see Section 4.3.5 "Uniform")".
3026 if (return_type
->contains_sampler()) {
3027 YYLTYPE loc
= this->get_location();
3028 _mesa_glsl_error(&loc
, state
,
3029 "function `%s' return type can't contain a sampler",
3033 /* Verify that this function's signature either doesn't match a previously
3034 * seen signature for a function with the same name, or, if a match is found,
3035 * that the previously seen signature does not have an associated definition.
3037 f
= state
->symbols
->get_function(name
);
3038 if (f
!= NULL
&& (state
->es_shader
|| f
->has_user_signature())) {
3039 sig
= f
->exact_matching_signature(&hir_parameters
);
3041 const char *badvar
= sig
->qualifiers_match(&hir_parameters
);
3042 if (badvar
!= NULL
) {
3043 YYLTYPE loc
= this->get_location();
3045 _mesa_glsl_error(&loc
, state
, "function `%s' parameter `%s' "
3046 "qualifiers don't match prototype", name
, badvar
);
3049 if (sig
->return_type
!= return_type
) {
3050 YYLTYPE loc
= this->get_location();
3052 _mesa_glsl_error(&loc
, state
, "function `%s' return type doesn't "
3053 "match prototype", name
);
3056 if (is_definition
&& sig
->is_defined
) {
3057 YYLTYPE loc
= this->get_location();
3059 _mesa_glsl_error(& loc
, state
, "function `%s' redefined", name
);
3063 f
= new(ctx
) ir_function(name
);
3064 if (!state
->symbols
->add_function(f
)) {
3065 /* This function name shadows a non-function use of the same name. */
3066 YYLTYPE loc
= this->get_location();
3068 _mesa_glsl_error(&loc
, state
, "function name `%s' conflicts with "
3069 "non-function", name
);
3073 emit_function(state
, f
);
3076 /* Verify the return type of main() */
3077 if (strcmp(name
, "main") == 0) {
3078 if (! return_type
->is_void()) {
3079 YYLTYPE loc
= this->get_location();
3081 _mesa_glsl_error(& loc
, state
, "main() must return void");
3084 if (!hir_parameters
.is_empty()) {
3085 YYLTYPE loc
= this->get_location();
3087 _mesa_glsl_error(& loc
, state
, "main() must not take any parameters");
3091 /* Finish storing the information about this new function in its signature.
3094 sig
= new(ctx
) ir_function_signature(return_type
);
3095 f
->add_signature(sig
);
3098 sig
->replace_parameters(&hir_parameters
);
3101 /* Function declarations (prototypes) do not have r-values.
3108 ast_function_definition::hir(exec_list
*instructions
,
3109 struct _mesa_glsl_parse_state
*state
)
3111 prototype
->is_definition
= true;
3112 prototype
->hir(instructions
, state
);
3114 ir_function_signature
*signature
= prototype
->signature
;
3115 if (signature
== NULL
)
3118 assert(state
->current_function
== NULL
);
3119 state
->current_function
= signature
;
3120 state
->found_return
= false;
3122 /* Duplicate parameters declared in the prototype as concrete variables.
3123 * Add these to the symbol table.
3125 state
->symbols
->push_scope();
3126 foreach_iter(exec_list_iterator
, iter
, signature
->parameters
) {
3127 ir_variable
*const var
= ((ir_instruction
*) iter
.get())->as_variable();
3129 assert(var
!= NULL
);
3131 /* The only way a parameter would "exist" is if two parameters have
3134 if (state
->symbols
->name_declared_this_scope(var
->name
)) {
3135 YYLTYPE loc
= this->get_location();
3137 _mesa_glsl_error(& loc
, state
, "parameter `%s' redeclared", var
->name
);
3139 state
->symbols
->add_variable(var
);
3143 /* Convert the body of the function to HIR. */
3144 this->body
->hir(&signature
->body
, state
);
3145 signature
->is_defined
= true;
3147 state
->symbols
->pop_scope();
3149 assert(state
->current_function
== signature
);
3150 state
->current_function
= NULL
;
3152 if (!signature
->return_type
->is_void() && !state
->found_return
) {
3153 YYLTYPE loc
= this->get_location();
3154 _mesa_glsl_error(& loc
, state
, "function `%s' has non-void return type "
3155 "%s, but no return statement",
3156 signature
->function_name(),
3157 signature
->return_type
->name
);
3160 /* Function definitions do not have r-values.
3167 ast_jump_statement::hir(exec_list
*instructions
,
3168 struct _mesa_glsl_parse_state
*state
)
3175 assert(state
->current_function
);
3177 if (opt_return_value
) {
3178 ir_rvalue
*const ret
= opt_return_value
->hir(instructions
, state
);
3180 /* The value of the return type can be NULL if the shader says
3181 * 'return foo();' and foo() is a function that returns void.
3183 * NOTE: The GLSL spec doesn't say that this is an error. The type
3184 * of the return value is void. If the return type of the function is
3185 * also void, then this should compile without error. Seriously.
3187 const glsl_type
*const ret_type
=
3188 (ret
== NULL
) ? glsl_type::void_type
: ret
->type
;
3190 /* Implicit conversions are not allowed for return values. */
3191 if (state
->current_function
->return_type
!= ret_type
) {
3192 YYLTYPE loc
= this->get_location();
3194 _mesa_glsl_error(& loc
, state
,
3195 "`return' with wrong type %s, in function `%s' "
3198 state
->current_function
->function_name(),
3199 state
->current_function
->return_type
->name
);
3202 inst
= new(ctx
) ir_return(ret
);
3204 if (state
->current_function
->return_type
->base_type
!=
3206 YYLTYPE loc
= this->get_location();
3208 _mesa_glsl_error(& loc
, state
,
3209 "`return' with no value, in function %s returning "
3211 state
->current_function
->function_name());
3213 inst
= new(ctx
) ir_return
;
3216 state
->found_return
= true;
3217 instructions
->push_tail(inst
);
3222 if (state
->target
!= fragment_shader
) {
3223 YYLTYPE loc
= this->get_location();
3225 _mesa_glsl_error(& loc
, state
,
3226 "`discard' may only appear in a fragment shader");
3228 instructions
->push_tail(new(ctx
) ir_discard
);
3233 /* FINISHME: Handle switch-statements. They cannot contain 'continue',
3234 * FINISHME: and they use a different IR instruction for 'break'.
3236 /* FINISHME: Correctly handle the nesting. If a switch-statement is
3237 * FINISHME: inside a loop, a 'continue' is valid and will bind to the
3240 if (state
->loop_or_switch_nesting
== NULL
) {
3241 YYLTYPE loc
= this->get_location();
3243 _mesa_glsl_error(& loc
, state
,
3244 "`%s' may only appear in a loop",
3245 (mode
== ast_break
) ? "break" : "continue");
3247 ir_loop
*const loop
= state
->loop_or_switch_nesting
->as_loop();
3249 /* Inline the for loop expression again, since we don't know
3250 * where near the end of the loop body the normal copy of it
3251 * is going to be placed.
3253 if (mode
== ast_continue
&&
3254 state
->loop_or_switch_nesting_ast
->rest_expression
) {
3255 state
->loop_or_switch_nesting_ast
->rest_expression
->hir(instructions
,
3260 ir_loop_jump
*const jump
=
3261 new(ctx
) ir_loop_jump((mode
== ast_break
)
3262 ? ir_loop_jump::jump_break
3263 : ir_loop_jump::jump_continue
);
3264 instructions
->push_tail(jump
);
3271 /* Jump instructions do not have r-values.
3278 ast_selection_statement::hir(exec_list
*instructions
,
3279 struct _mesa_glsl_parse_state
*state
)
3283 ir_rvalue
*const condition
= this->condition
->hir(instructions
, state
);
3285 /* From page 66 (page 72 of the PDF) of the GLSL 1.50 spec:
3287 * "Any expression whose type evaluates to a Boolean can be used as the
3288 * conditional expression bool-expression. Vector types are not accepted
3289 * as the expression to if."
3291 * The checks are separated so that higher quality diagnostics can be
3292 * generated for cases where both rules are violated.
3294 if (!condition
->type
->is_boolean() || !condition
->type
->is_scalar()) {
3295 YYLTYPE loc
= this->condition
->get_location();
3297 _mesa_glsl_error(& loc
, state
, "if-statement condition must be scalar "
3301 ir_if
*const stmt
= new(ctx
) ir_if(condition
);
3303 if (then_statement
!= NULL
) {
3304 state
->symbols
->push_scope();
3305 then_statement
->hir(& stmt
->then_instructions
, state
);
3306 state
->symbols
->pop_scope();
3309 if (else_statement
!= NULL
) {
3310 state
->symbols
->push_scope();
3311 else_statement
->hir(& stmt
->else_instructions
, state
);
3312 state
->symbols
->pop_scope();
3315 instructions
->push_tail(stmt
);
3317 /* if-statements do not have r-values.
3324 ast_iteration_statement::condition_to_hir(ir_loop
*stmt
,
3325 struct _mesa_glsl_parse_state
*state
)
3329 if (condition
!= NULL
) {
3330 ir_rvalue
*const cond
=
3331 condition
->hir(& stmt
->body_instructions
, state
);
3334 || !cond
->type
->is_boolean() || !cond
->type
->is_scalar()) {
3335 YYLTYPE loc
= condition
->get_location();
3337 _mesa_glsl_error(& loc
, state
,
3338 "loop condition must be scalar boolean");
3340 /* As the first code in the loop body, generate a block that looks
3341 * like 'if (!condition) break;' as the loop termination condition.
3343 ir_rvalue
*const not_cond
=
3344 new(ctx
) ir_expression(ir_unop_logic_not
, glsl_type::bool_type
, cond
,
3347 ir_if
*const if_stmt
= new(ctx
) ir_if(not_cond
);
3349 ir_jump
*const break_stmt
=
3350 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
3352 if_stmt
->then_instructions
.push_tail(break_stmt
);
3353 stmt
->body_instructions
.push_tail(if_stmt
);
3360 ast_iteration_statement::hir(exec_list
*instructions
,
3361 struct _mesa_glsl_parse_state
*state
)
3365 /* For-loops and while-loops start a new scope, but do-while loops do not.
3367 if (mode
!= ast_do_while
)
3368 state
->symbols
->push_scope();
3370 if (init_statement
!= NULL
)
3371 init_statement
->hir(instructions
, state
);
3373 ir_loop
*const stmt
= new(ctx
) ir_loop();
3374 instructions
->push_tail(stmt
);
3376 /* Track the current loop and / or switch-statement nesting.
3378 ir_instruction
*const nesting
= state
->loop_or_switch_nesting
;
3379 ast_iteration_statement
*nesting_ast
= state
->loop_or_switch_nesting_ast
;
3381 state
->loop_or_switch_nesting
= stmt
;
3382 state
->loop_or_switch_nesting_ast
= this;
3384 if (mode
!= ast_do_while
)
3385 condition_to_hir(stmt
, state
);
3388 body
->hir(& stmt
->body_instructions
, state
);
3390 if (rest_expression
!= NULL
)
3391 rest_expression
->hir(& stmt
->body_instructions
, state
);
3393 if (mode
== ast_do_while
)
3394 condition_to_hir(stmt
, state
);
3396 if (mode
!= ast_do_while
)
3397 state
->symbols
->pop_scope();
3399 /* Restore previous nesting before returning.
3401 state
->loop_or_switch_nesting
= nesting
;
3402 state
->loop_or_switch_nesting_ast
= nesting_ast
;
3404 /* Loops do not have r-values.
3411 ast_type_specifier::hir(exec_list
*instructions
,
3412 struct _mesa_glsl_parse_state
*state
)
3414 if (!this->is_precision_statement
&& this->structure
== NULL
)
3417 YYLTYPE loc
= this->get_location();
3419 if (this->precision
!= ast_precision_none
3420 && state
->language_version
!= 100
3421 && state
->language_version
< 130) {
3422 _mesa_glsl_error(&loc
, state
,
3423 "precision qualifiers exist only in "
3424 "GLSL ES 1.00, and GLSL 1.30 and later");
3427 if (this->precision
!= ast_precision_none
3428 && this->structure
!= NULL
) {
3429 _mesa_glsl_error(&loc
, state
,
3430 "precision qualifiers do not apply to structures");
3434 /* If this is a precision statement, check that the type to which it is
3435 * applied is either float or int.
3437 * From section 4.5.3 of the GLSL 1.30 spec:
3438 * "The precision statement
3439 * precision precision-qualifier type;
3440 * can be used to establish a default precision qualifier. The type
3441 * field can be either int or float [...]. Any other types or
3442 * qualifiers will result in an error.
3444 if (this->is_precision_statement
) {
3445 assert(this->precision
!= ast_precision_none
);
3446 assert(this->structure
== NULL
); /* The check for structures was
3447 * performed above. */
3448 if (this->is_array
) {
3449 _mesa_glsl_error(&loc
, state
,
3450 "default precision statements do not apply to "
3454 if (this->type_specifier
!= ast_float
3455 && this->type_specifier
!= ast_int
) {
3456 _mesa_glsl_error(&loc
, state
,
3457 "default precision statements apply only to types "
3462 /* FINISHME: Translate precision statements into IR. */
3466 if (this->structure
!= NULL
)
3467 return this->structure
->hir(instructions
, state
);
3474 ast_struct_specifier::hir(exec_list
*instructions
,
3475 struct _mesa_glsl_parse_state
*state
)
3477 unsigned decl_count
= 0;
3479 /* Make an initial pass over the list of structure fields to determine how
3480 * many there are. Each element in this list is an ast_declarator_list.
3481 * This means that we actually need to count the number of elements in the
3482 * 'declarations' list in each of the elements.
3484 foreach_list_typed (ast_declarator_list
, decl_list
, link
,
3485 &this->declarations
) {
3486 foreach_list_const (decl_ptr
, & decl_list
->declarations
) {
3491 /* Allocate storage for the structure fields and process the field
3492 * declarations. As the declarations are processed, try to also convert
3493 * the types to HIR. This ensures that structure definitions embedded in
3494 * other structure definitions are processed.
3496 glsl_struct_field
*const fields
= ralloc_array(state
, glsl_struct_field
,
3500 foreach_list_typed (ast_declarator_list
, decl_list
, link
,
3501 &this->declarations
) {
3502 const char *type_name
;
3504 decl_list
->type
->specifier
->hir(instructions
, state
);
3506 /* Section 10.9 of the GLSL ES 1.00 specification states that
3507 * embedded structure definitions have been removed from the language.
3509 if (state
->es_shader
&& decl_list
->type
->specifier
->structure
!= NULL
) {
3510 YYLTYPE loc
= this->get_location();
3511 _mesa_glsl_error(&loc
, state
, "Embedded structure definitions are "
3512 "not allowed in GLSL ES 1.00.");
3515 const glsl_type
*decl_type
=
3516 decl_list
->type
->specifier
->glsl_type(& type_name
, state
);
3518 foreach_list_typed (ast_declaration
, decl
, link
,
3519 &decl_list
->declarations
) {
3520 const struct glsl_type
*field_type
= decl_type
;
3521 if (decl
->is_array
) {
3522 YYLTYPE loc
= decl
->get_location();
3523 field_type
= process_array_type(&loc
, decl_type
, decl
->array_size
,
3526 fields
[i
].type
= (field_type
!= NULL
)
3527 ? field_type
: glsl_type::error_type
;
3528 fields
[i
].name
= decl
->identifier
;
3533 assert(i
== decl_count
);
3535 const glsl_type
*t
=
3536 glsl_type::get_record_instance(fields
, decl_count
, this->name
);
3538 YYLTYPE loc
= this->get_location();
3539 if (!state
->symbols
->add_type(name
, t
)) {
3540 _mesa_glsl_error(& loc
, state
, "struct `%s' previously defined", name
);
3542 const glsl_type
**s
= reralloc(state
, state
->user_structures
,
3544 state
->num_user_structures
+ 1);
3546 s
[state
->num_user_structures
] = t
;
3547 state
->user_structures
= s
;
3548 state
->num_user_structures
++;
3552 /* Structure type definitions do not have r-values.