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"
57 #include "program/hash_table.h"
61 detect_conflicting_assignments(struct _mesa_glsl_parse_state
*state
,
62 exec_list
*instructions
);
65 _mesa_ast_to_hir(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
)
67 _mesa_glsl_initialize_variables(instructions
, state
);
69 state
->symbols
->separate_function_namespace
= state
->language_version
== 110;
71 state
->current_function
= NULL
;
73 state
->toplevel_ir
= instructions
;
75 state
->gs_input_prim_type_specified
= false;
77 /* Section 4.2 of the GLSL 1.20 specification states:
78 * "The built-in functions are scoped in a scope outside the global scope
79 * users declare global variables in. That is, a shader's global scope,
80 * available for user-defined functions and global variables, is nested
81 * inside the scope containing the built-in functions."
83 * Since built-in functions like ftransform() access built-in variables,
84 * it follows that those must be in the outer scope as well.
86 * We push scope here to create this nesting effect...but don't pop.
87 * This way, a shader's globals are still in the symbol table for use
90 state
->symbols
->push_scope();
92 foreach_list_typed (ast_node
, ast
, link
, & state
->translation_unit
)
93 ast
->hir(instructions
, state
);
95 detect_recursion_unlinked(state
, instructions
);
96 detect_conflicting_assignments(state
, instructions
);
98 state
->toplevel_ir
= NULL
;
100 /* Move all of the variable declarations to the front of the IR list, and
101 * reverse the order. This has the (intended!) side effect that vertex
102 * shader inputs and fragment shader outputs will appear in the IR in the
103 * same order that they appeared in the shader code. This results in the
104 * locations being assigned in the declared order. Many (arguably buggy)
105 * applications depend on this behavior, and it matches what nearly all
108 foreach_list_safe(node
, instructions
) {
109 ir_variable
*const var
= ((ir_instruction
*) node
)->as_variable();
115 instructions
->push_head(var
);
121 * If a conversion is available, convert one operand to a different type
123 * The \c from \c ir_rvalue is converted "in place".
125 * \param to Type that the operand it to be converted to
126 * \param from Operand that is being converted
127 * \param state GLSL compiler state
130 * If a conversion is possible (or unnecessary), \c true is returned.
131 * Otherwise \c false is returned.
134 apply_implicit_conversion(const glsl_type
*to
, ir_rvalue
* &from
,
135 struct _mesa_glsl_parse_state
*state
)
138 if (to
->base_type
== from
->type
->base_type
)
141 /* This conversion was added in GLSL 1.20. If the compilation mode is
142 * GLSL 1.10, the conversion is skipped.
144 if (!state
->is_version(120, 0))
147 /* From page 27 (page 33 of the PDF) of the GLSL 1.50 spec:
149 * "There are no implicit array or structure conversions. For
150 * example, an array of int cannot be implicitly converted to an
151 * array of float. There are no implicit conversions between
152 * signed and unsigned integers."
154 /* FINISHME: The above comment is partially a lie. There is int/uint
155 * FINISHME: conversion for immediate constants.
157 if (!to
->is_float() || !from
->type
->is_numeric())
160 /* Convert to a floating point type with the same number of components
161 * as the original type - i.e. int to float, not int to vec4.
163 to
= glsl_type::get_instance(GLSL_TYPE_FLOAT
, from
->type
->vector_elements
,
164 from
->type
->matrix_columns
);
166 switch (from
->type
->base_type
) {
168 from
= new(ctx
) ir_expression(ir_unop_i2f
, to
, from
, NULL
);
171 from
= new(ctx
) ir_expression(ir_unop_u2f
, to
, from
, NULL
);
174 from
= new(ctx
) ir_expression(ir_unop_b2f
, to
, from
, NULL
);
184 static const struct glsl_type
*
185 arithmetic_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
187 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
189 const glsl_type
*type_a
= value_a
->type
;
190 const glsl_type
*type_b
= value_b
->type
;
192 /* From GLSL 1.50 spec, page 56:
194 * "The arithmetic binary operators add (+), subtract (-),
195 * multiply (*), and divide (/) operate on integer and
196 * floating-point scalars, vectors, and matrices."
198 if (!type_a
->is_numeric() || !type_b
->is_numeric()) {
199 _mesa_glsl_error(loc
, state
,
200 "operands to arithmetic operators must be numeric");
201 return glsl_type::error_type
;
205 /* "If one operand is floating-point based and the other is
206 * not, then the conversions from Section 4.1.10 "Implicit
207 * Conversions" are applied to the non-floating-point-based operand."
209 if (!apply_implicit_conversion(type_a
, value_b
, state
)
210 && !apply_implicit_conversion(type_b
, value_a
, state
)) {
211 _mesa_glsl_error(loc
, state
,
212 "could not implicitly convert operands to "
213 "arithmetic operator");
214 return glsl_type::error_type
;
216 type_a
= value_a
->type
;
217 type_b
= value_b
->type
;
219 /* "If the operands are integer types, they must both be signed or
222 * From this rule and the preceeding conversion it can be inferred that
223 * both types must be GLSL_TYPE_FLOAT, or GLSL_TYPE_UINT, or GLSL_TYPE_INT.
224 * The is_numeric check above already filtered out the case where either
225 * type is not one of these, so now the base types need only be tested for
228 if (type_a
->base_type
!= type_b
->base_type
) {
229 _mesa_glsl_error(loc
, state
,
230 "base type mismatch for arithmetic operator");
231 return glsl_type::error_type
;
234 /* "All arithmetic binary operators result in the same fundamental type
235 * (signed integer, unsigned integer, or floating-point) as the
236 * operands they operate on, after operand type conversion. After
237 * conversion, the following cases are valid
239 * * The two operands are scalars. In this case the operation is
240 * applied, resulting in a scalar."
242 if (type_a
->is_scalar() && type_b
->is_scalar())
245 /* "* One operand is a scalar, and the other is a vector or matrix.
246 * In this case, the scalar operation is applied independently to each
247 * component of the vector or matrix, resulting in the same size
250 if (type_a
->is_scalar()) {
251 if (!type_b
->is_scalar())
253 } else if (type_b
->is_scalar()) {
257 /* All of the combinations of <scalar, scalar>, <vector, scalar>,
258 * <scalar, vector>, <scalar, matrix>, and <matrix, scalar> have been
261 assert(!type_a
->is_scalar());
262 assert(!type_b
->is_scalar());
264 /* "* The two operands are vectors of the same size. In this case, the
265 * operation is done component-wise resulting in the same size
268 if (type_a
->is_vector() && type_b
->is_vector()) {
269 if (type_a
== type_b
) {
272 _mesa_glsl_error(loc
, state
,
273 "vector size mismatch for arithmetic operator");
274 return glsl_type::error_type
;
278 /* All of the combinations of <scalar, scalar>, <vector, scalar>,
279 * <scalar, vector>, <scalar, matrix>, <matrix, scalar>, and
280 * <vector, vector> have been handled. At least one of the operands must
281 * be matrix. Further, since there are no integer matrix types, the base
282 * type of both operands must be float.
284 assert(type_a
->is_matrix() || type_b
->is_matrix());
285 assert(type_a
->base_type
== GLSL_TYPE_FLOAT
);
286 assert(type_b
->base_type
== GLSL_TYPE_FLOAT
);
288 /* "* The operator is add (+), subtract (-), or divide (/), and the
289 * operands are matrices with the same number of rows and the same
290 * number of columns. In this case, the operation is done component-
291 * wise resulting in the same size matrix."
292 * * The operator is multiply (*), where both operands are matrices or
293 * one operand is a vector and the other a matrix. A right vector
294 * operand is treated as a column vector and a left vector operand as a
295 * row vector. In all these cases, it is required that the number of
296 * columns of the left operand is equal to the number of rows of the
297 * right operand. Then, the multiply (*) operation does a linear
298 * algebraic multiply, yielding an object that has the same number of
299 * rows as the left operand and the same number of columns as the right
300 * operand. Section 5.10 "Vector and Matrix Operations" explains in
301 * more detail how vectors and matrices are operated on."
304 if (type_a
== type_b
)
307 if (type_a
->is_matrix() && type_b
->is_matrix()) {
308 /* Matrix multiply. The columns of A must match the rows of B. Given
309 * the other previously tested constraints, this means the vector type
310 * of a row from A must be the same as the vector type of a column from
313 if (type_a
->row_type() == type_b
->column_type()) {
314 /* The resulting matrix has the number of columns of matrix B and
315 * the number of rows of matrix A. We get the row count of A by
316 * looking at the size of a vector that makes up a column. The
317 * transpose (size of a row) is done for B.
319 const glsl_type
*const type
=
320 glsl_type::get_instance(type_a
->base_type
,
321 type_a
->column_type()->vector_elements
,
322 type_b
->row_type()->vector_elements
);
323 assert(type
!= glsl_type::error_type
);
327 } else if (type_a
->is_matrix()) {
328 /* A is a matrix and B is a column vector. Columns of A must match
329 * rows of B. Given the other previously tested constraints, this
330 * means the vector type of a row from A must be the same as the
331 * vector the type of B.
333 if (type_a
->row_type() == type_b
) {
334 /* The resulting vector has a number of elements equal to
335 * the number of rows of matrix A. */
336 const glsl_type
*const type
=
337 glsl_type::get_instance(type_a
->base_type
,
338 type_a
->column_type()->vector_elements
,
340 assert(type
!= glsl_type::error_type
);
345 assert(type_b
->is_matrix());
347 /* A is a row vector and B is a matrix. Columns of A must match rows
348 * of B. Given the other previously tested constraints, this means
349 * the type of A must be the same as the vector type of a column from
352 if (type_a
== type_b
->column_type()) {
353 /* The resulting vector has a number of elements equal to
354 * the number of columns of matrix B. */
355 const glsl_type
*const type
=
356 glsl_type::get_instance(type_a
->base_type
,
357 type_b
->row_type()->vector_elements
,
359 assert(type
!= glsl_type::error_type
);
365 _mesa_glsl_error(loc
, state
, "size mismatch for matrix multiplication");
366 return glsl_type::error_type
;
370 /* "All other cases are illegal."
372 _mesa_glsl_error(loc
, state
, "type mismatch");
373 return glsl_type::error_type
;
377 static const struct glsl_type
*
378 unary_arithmetic_result_type(const struct glsl_type
*type
,
379 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
381 /* From GLSL 1.50 spec, page 57:
383 * "The arithmetic unary operators negate (-), post- and pre-increment
384 * and decrement (-- and ++) operate on integer or floating-point
385 * values (including vectors and matrices). All unary operators work
386 * component-wise on their operands. These result with the same type
389 if (!type
->is_numeric()) {
390 _mesa_glsl_error(loc
, state
,
391 "operands to arithmetic operators must be numeric");
392 return glsl_type::error_type
;
399 * \brief Return the result type of a bit-logic operation.
401 * If the given types to the bit-logic operator are invalid, return
402 * glsl_type::error_type.
404 * \param type_a Type of LHS of bit-logic op
405 * \param type_b Type of RHS of bit-logic op
407 static const struct glsl_type
*
408 bit_logic_result_type(const struct glsl_type
*type_a
,
409 const struct glsl_type
*type_b
,
411 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
413 if (!state
->check_bitwise_operations_allowed(loc
)) {
414 return glsl_type::error_type
;
417 /* From page 50 (page 56 of PDF) of GLSL 1.30 spec:
419 * "The bitwise operators and (&), exclusive-or (^), and inclusive-or
420 * (|). The operands must be of type signed or unsigned integers or
423 if (!type_a
->is_integer()) {
424 _mesa_glsl_error(loc
, state
, "LHS of `%s' must be an integer",
425 ast_expression::operator_string(op
));
426 return glsl_type::error_type
;
428 if (!type_b
->is_integer()) {
429 _mesa_glsl_error(loc
, state
, "RHS of `%s' must be an integer",
430 ast_expression::operator_string(op
));
431 return glsl_type::error_type
;
434 /* "The fundamental types of the operands (signed or unsigned) must
437 if (type_a
->base_type
!= type_b
->base_type
) {
438 _mesa_glsl_error(loc
, state
, "operands of `%s' must have the same "
439 "base type", ast_expression::operator_string(op
));
440 return glsl_type::error_type
;
443 /* "The operands cannot be vectors of differing size." */
444 if (type_a
->is_vector() &&
445 type_b
->is_vector() &&
446 type_a
->vector_elements
!= type_b
->vector_elements
) {
447 _mesa_glsl_error(loc
, state
, "operands of `%s' cannot be vectors of "
448 "different sizes", ast_expression::operator_string(op
));
449 return glsl_type::error_type
;
452 /* "If one operand is a scalar and the other a vector, the scalar is
453 * applied component-wise to the vector, resulting in the same type as
454 * the vector. The fundamental types of the operands [...] will be the
455 * resulting fundamental type."
457 if (type_a
->is_scalar())
463 static const struct glsl_type
*
464 modulus_result_type(const struct glsl_type
*type_a
,
465 const struct glsl_type
*type_b
,
466 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
468 if (!state
->check_version(130, 300, loc
, "operator '%%' is reserved")) {
469 return glsl_type::error_type
;
472 /* From GLSL 1.50 spec, page 56:
473 * "The operator modulus (%) operates on signed or unsigned integers or
474 * integer vectors. The operand types must both be signed or both be
477 if (!type_a
->is_integer()) {
478 _mesa_glsl_error(loc
, state
, "LHS of operator %% must be an integer");
479 return glsl_type::error_type
;
481 if (!type_b
->is_integer()) {
482 _mesa_glsl_error(loc
, state
, "RHS of operator %% must be an integer");
483 return glsl_type::error_type
;
485 if (type_a
->base_type
!= type_b
->base_type
) {
486 _mesa_glsl_error(loc
, state
,
487 "operands of %% must have the same base type");
488 return glsl_type::error_type
;
491 /* "The operands cannot be vectors of differing size. If one operand is
492 * a scalar and the other vector, then the scalar is applied component-
493 * wise to the vector, resulting in the same type as the vector. If both
494 * are vectors of the same size, the result is computed component-wise."
496 if (type_a
->is_vector()) {
497 if (!type_b
->is_vector()
498 || (type_a
->vector_elements
== type_b
->vector_elements
))
503 /* "The operator modulus (%) is not defined for any other data types
504 * (non-integer types)."
506 _mesa_glsl_error(loc
, state
, "type mismatch");
507 return glsl_type::error_type
;
511 static const struct glsl_type
*
512 relational_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
513 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
515 const glsl_type
*type_a
= value_a
->type
;
516 const glsl_type
*type_b
= value_b
->type
;
518 /* From GLSL 1.50 spec, page 56:
519 * "The relational operators greater than (>), less than (<), greater
520 * than or equal (>=), and less than or equal (<=) operate only on
521 * scalar integer and scalar floating-point expressions."
523 if (!type_a
->is_numeric()
524 || !type_b
->is_numeric()
525 || !type_a
->is_scalar()
526 || !type_b
->is_scalar()) {
527 _mesa_glsl_error(loc
, state
,
528 "operands to relational operators must be scalar and "
530 return glsl_type::error_type
;
533 /* "Either the operands' types must match, or the conversions from
534 * Section 4.1.10 "Implicit Conversions" will be applied to the integer
535 * operand, after which the types must match."
537 if (!apply_implicit_conversion(type_a
, value_b
, state
)
538 && !apply_implicit_conversion(type_b
, value_a
, state
)) {
539 _mesa_glsl_error(loc
, state
,
540 "could not implicitly convert operands to "
541 "relational operator");
542 return glsl_type::error_type
;
544 type_a
= value_a
->type
;
545 type_b
= value_b
->type
;
547 if (type_a
->base_type
!= type_b
->base_type
) {
548 _mesa_glsl_error(loc
, state
, "base type mismatch");
549 return glsl_type::error_type
;
552 /* "The result is scalar Boolean."
554 return glsl_type::bool_type
;
558 * \brief Return the result type of a bit-shift operation.
560 * If the given types to the bit-shift operator are invalid, return
561 * glsl_type::error_type.
563 * \param type_a Type of LHS of bit-shift op
564 * \param type_b Type of RHS of bit-shift op
566 static const struct glsl_type
*
567 shift_result_type(const struct glsl_type
*type_a
,
568 const struct glsl_type
*type_b
,
570 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
572 if (!state
->check_bitwise_operations_allowed(loc
)) {
573 return glsl_type::error_type
;
576 /* From page 50 (page 56 of the PDF) of the GLSL 1.30 spec:
578 * "The shift operators (<<) and (>>). For both operators, the operands
579 * must be signed or unsigned integers or integer vectors. One operand
580 * can be signed while the other is unsigned."
582 if (!type_a
->is_integer()) {
583 _mesa_glsl_error(loc
, state
, "LHS of operator %s must be an integer or "
584 "integer vector", ast_expression::operator_string(op
));
585 return glsl_type::error_type
;
588 if (!type_b
->is_integer()) {
589 _mesa_glsl_error(loc
, state
, "RHS of operator %s must be an integer or "
590 "integer vector", ast_expression::operator_string(op
));
591 return glsl_type::error_type
;
594 /* "If the first operand is a scalar, the second operand has to be
597 if (type_a
->is_scalar() && !type_b
->is_scalar()) {
598 _mesa_glsl_error(loc
, state
, "if the first operand of %s is scalar, the "
599 "second must be scalar as well",
600 ast_expression::operator_string(op
));
601 return glsl_type::error_type
;
604 /* If both operands are vectors, check that they have same number of
607 if (type_a
->is_vector() &&
608 type_b
->is_vector() &&
609 type_a
->vector_elements
!= type_b
->vector_elements
) {
610 _mesa_glsl_error(loc
, state
, "vector operands to operator %s must "
611 "have same number of elements",
612 ast_expression::operator_string(op
));
613 return glsl_type::error_type
;
616 /* "In all cases, the resulting type will be the same type as the left
623 * Validates that a value can be assigned to a location with a specified type
625 * Validates that \c rhs can be assigned to some location. If the types are
626 * not an exact match but an automatic conversion is possible, \c rhs will be
630 * \c NULL if \c rhs cannot be assigned to a location with type \c lhs_type.
631 * Otherwise the actual RHS to be assigned will be returned. This may be
632 * \c rhs, or it may be \c rhs after some type conversion.
635 * In addition to being used for assignments, this function is used to
636 * type-check return values.
639 validate_assignment(struct _mesa_glsl_parse_state
*state
,
640 const glsl_type
*lhs_type
, ir_rvalue
*rhs
,
643 /* If there is already some error in the RHS, just return it. Anything
644 * else will lead to an avalanche of error message back to the user.
646 if (rhs
->type
->is_error())
649 /* If the types are identical, the assignment can trivially proceed.
651 if (rhs
->type
== lhs_type
)
654 /* If the array element types are the same and the size of the LHS is zero,
655 * the assignment is okay for initializers embedded in variable
658 * Note: Whole-array assignments are not permitted in GLSL 1.10, but this
659 * is handled by ir_dereference::is_lvalue.
661 if (is_initializer
&& lhs_type
->is_array() && rhs
->type
->is_array()
662 && (lhs_type
->element_type() == rhs
->type
->element_type())
663 && (lhs_type
->array_size() == 0)) {
667 /* Check for implicit conversion in GLSL 1.20 */
668 if (apply_implicit_conversion(lhs_type
, rhs
, state
)) {
669 if (rhs
->type
== lhs_type
)
677 mark_whole_array_access(ir_rvalue
*access
)
679 ir_dereference_variable
*deref
= access
->as_dereference_variable();
681 if (deref
&& deref
->var
) {
682 deref
->var
->max_array_access
= deref
->type
->length
- 1;
687 do_assignment(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
,
688 const char *non_lvalue_description
,
689 ir_rvalue
*lhs
, ir_rvalue
*rhs
, bool is_initializer
,
693 bool error_emitted
= (lhs
->type
->is_error() || rhs
->type
->is_error());
695 /* If the assignment LHS comes back as an ir_binop_vector_extract
696 * expression, move it to the RHS as an ir_triop_vector_insert.
698 if (lhs
->ir_type
== ir_type_expression
) {
699 ir_expression
*const expr
= lhs
->as_expression();
701 if (unlikely(expr
->operation
== ir_binop_vector_extract
)) {
703 validate_assignment(state
, lhs
->type
, rhs
, is_initializer
);
705 if (new_rhs
== NULL
) {
706 _mesa_glsl_error(& lhs_loc
, state
, "type mismatch");
709 rhs
= new(ctx
) ir_expression(ir_triop_vector_insert
,
710 expr
->operands
[0]->type
,
714 lhs
= expr
->operands
[0]->clone(ctx
, NULL
);
719 ir_variable
*lhs_var
= lhs
->variable_referenced();
721 lhs_var
->assigned
= true;
723 if (!error_emitted
) {
724 if (non_lvalue_description
!= NULL
) {
725 _mesa_glsl_error(&lhs_loc
, state
,
727 non_lvalue_description
);
728 error_emitted
= true;
729 } else if (lhs
->variable_referenced() != NULL
730 && lhs
->variable_referenced()->read_only
) {
731 _mesa_glsl_error(&lhs_loc
, state
,
732 "assignment to read-only variable '%s'",
733 lhs
->variable_referenced()->name
);
734 error_emitted
= true;
736 } else if (lhs
->type
->is_array() &&
737 !state
->check_version(120, 300, &lhs_loc
,
738 "whole array assignment forbidden")) {
739 /* From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
741 * "Other binary or unary expressions, non-dereferenced
742 * arrays, function names, swizzles with repeated fields,
743 * and constants cannot be l-values."
745 * The restriction on arrays is lifted in GLSL 1.20 and GLSL ES 3.00.
747 error_emitted
= true;
748 } else if (!lhs
->is_lvalue()) {
749 _mesa_glsl_error(& lhs_loc
, state
, "non-lvalue in assignment");
750 error_emitted
= true;
755 validate_assignment(state
, lhs
->type
, rhs
, is_initializer
);
756 if (new_rhs
== NULL
) {
757 _mesa_glsl_error(& lhs_loc
, state
, "type mismatch");
761 /* If the LHS array was not declared with a size, it takes it size from
762 * the RHS. If the LHS is an l-value and a whole array, it must be a
763 * dereference of a variable. Any other case would require that the LHS
764 * is either not an l-value or not a whole array.
766 if (lhs
->type
->array_size() == 0) {
767 ir_dereference
*const d
= lhs
->as_dereference();
771 ir_variable
*const var
= d
->variable_referenced();
775 if (var
->max_array_access
>= unsigned(rhs
->type
->array_size())) {
776 /* FINISHME: This should actually log the location of the RHS. */
777 _mesa_glsl_error(& lhs_loc
, state
, "array size must be > %u due to "
779 var
->max_array_access
);
782 var
->type
= glsl_type::get_array_instance(lhs
->type
->element_type(),
783 rhs
->type
->array_size());
786 mark_whole_array_access(rhs
);
787 mark_whole_array_access(lhs
);
790 /* Most callers of do_assignment (assign, add_assign, pre_inc/dec,
791 * but not post_inc) need the converted assigned value as an rvalue
792 * to handle things like:
796 * So we always just store the computed value being assigned to a
797 * temporary and return a deref of that temporary. If the rvalue
798 * ends up not being used, the temp will get copy-propagated out.
800 ir_variable
*var
= new(ctx
) ir_variable(rhs
->type
, "assignment_tmp",
802 ir_dereference_variable
*deref_var
= new(ctx
) ir_dereference_variable(var
);
803 instructions
->push_tail(var
);
804 instructions
->push_tail(new(ctx
) ir_assignment(deref_var
, rhs
));
805 deref_var
= new(ctx
) ir_dereference_variable(var
);
808 instructions
->push_tail(new(ctx
) ir_assignment(lhs
, deref_var
));
810 return new(ctx
) ir_dereference_variable(var
);
814 get_lvalue_copy(exec_list
*instructions
, ir_rvalue
*lvalue
)
816 void *ctx
= ralloc_parent(lvalue
);
819 var
= new(ctx
) ir_variable(lvalue
->type
, "_post_incdec_tmp",
821 instructions
->push_tail(var
);
822 var
->mode
= ir_var_auto
;
824 instructions
->push_tail(new(ctx
) ir_assignment(new(ctx
) ir_dereference_variable(var
),
827 return new(ctx
) ir_dereference_variable(var
);
832 ast_node::hir(exec_list
*instructions
,
833 struct _mesa_glsl_parse_state
*state
)
842 do_comparison(void *mem_ctx
, int operation
, ir_rvalue
*op0
, ir_rvalue
*op1
)
845 ir_rvalue
*cmp
= NULL
;
847 if (operation
== ir_binop_all_equal
)
848 join_op
= ir_binop_logic_and
;
850 join_op
= ir_binop_logic_or
;
852 switch (op0
->type
->base_type
) {
853 case GLSL_TYPE_FLOAT
:
857 return new(mem_ctx
) ir_expression(operation
, op0
, op1
);
859 case GLSL_TYPE_ARRAY
: {
860 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
861 ir_rvalue
*e0
, *e1
, *result
;
863 e0
= new(mem_ctx
) ir_dereference_array(op0
->clone(mem_ctx
, NULL
),
864 new(mem_ctx
) ir_constant(i
));
865 e1
= new(mem_ctx
) ir_dereference_array(op1
->clone(mem_ctx
, NULL
),
866 new(mem_ctx
) ir_constant(i
));
867 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
870 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
876 mark_whole_array_access(op0
);
877 mark_whole_array_access(op1
);
881 case GLSL_TYPE_STRUCT
: {
882 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
883 ir_rvalue
*e0
, *e1
, *result
;
884 const char *field_name
= op0
->type
->fields
.structure
[i
].name
;
886 e0
= new(mem_ctx
) ir_dereference_record(op0
->clone(mem_ctx
, NULL
),
888 e1
= new(mem_ctx
) ir_dereference_record(op1
->clone(mem_ctx
, NULL
),
890 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
893 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
901 case GLSL_TYPE_ERROR
:
903 case GLSL_TYPE_SAMPLER
:
904 case GLSL_TYPE_INTERFACE
:
905 /* I assume a comparison of a struct containing a sampler just
906 * ignores the sampler present in the type.
912 cmp
= new(mem_ctx
) ir_constant(true);
917 /* For logical operations, we want to ensure that the operands are
918 * scalar booleans. If it isn't, emit an error and return a constant
919 * boolean to avoid triggering cascading error messages.
922 get_scalar_boolean_operand(exec_list
*instructions
,
923 struct _mesa_glsl_parse_state
*state
,
924 ast_expression
*parent_expr
,
926 const char *operand_name
,
929 ast_expression
*expr
= parent_expr
->subexpressions
[operand
];
931 ir_rvalue
*val
= expr
->hir(instructions
, state
);
933 if (val
->type
->is_boolean() && val
->type
->is_scalar())
936 if (!*error_emitted
) {
937 YYLTYPE loc
= expr
->get_location();
938 _mesa_glsl_error(&loc
, state
, "%s of `%s' must be scalar boolean",
940 parent_expr
->operator_string(parent_expr
->oper
));
941 *error_emitted
= true;
944 return new(ctx
) ir_constant(true);
948 * If name refers to a builtin array whose maximum allowed size is less than
949 * size, report an error and return true. Otherwise return false.
952 check_builtin_array_max_size(const char *name
, unsigned size
,
953 YYLTYPE loc
, struct _mesa_glsl_parse_state
*state
)
955 if ((strcmp("gl_TexCoord", name
) == 0)
956 && (size
> state
->Const
.MaxTextureCoords
)) {
957 /* From page 54 (page 60 of the PDF) of the GLSL 1.20 spec:
959 * "The size [of gl_TexCoord] can be at most
960 * gl_MaxTextureCoords."
962 _mesa_glsl_error(&loc
, state
, "`gl_TexCoord' array size cannot "
963 "be larger than gl_MaxTextureCoords (%u)",
964 state
->Const
.MaxTextureCoords
);
965 } else if (strcmp("gl_ClipDistance", name
) == 0
966 && size
> state
->Const
.MaxClipPlanes
) {
967 /* From section 7.1 (Vertex Shader Special Variables) of the
970 * "The gl_ClipDistance array is predeclared as unsized and
971 * must be sized by the shader either redeclaring it with a
972 * size or indexing it only with integral constant
973 * expressions. ... The size can be at most
974 * gl_MaxClipDistances."
976 _mesa_glsl_error(&loc
, state
, "`gl_ClipDistance' array size cannot "
977 "be larger than gl_MaxClipDistances (%u)",
978 state
->Const
.MaxClipPlanes
);
983 * Create the constant 1, of a which is appropriate for incrementing and
984 * decrementing values of the given GLSL type. For example, if type is vec4,
985 * this creates a constant value of 1.0 having type float.
987 * If the given type is invalid for increment and decrement operators, return
988 * a floating point 1--the error will be detected later.
991 constant_one_for_inc_dec(void *ctx
, const glsl_type
*type
)
993 switch (type
->base_type
) {
995 return new(ctx
) ir_constant((unsigned) 1);
997 return new(ctx
) ir_constant(1);
999 case GLSL_TYPE_FLOAT
:
1000 return new(ctx
) ir_constant(1.0f
);
1005 ast_expression::hir(exec_list
*instructions
,
1006 struct _mesa_glsl_parse_state
*state
)
1009 static const int operations
[AST_NUM_OPERATORS
] = {
1010 -1, /* ast_assign doesn't convert to ir_expression. */
1011 -1, /* ast_plus doesn't convert to ir_expression. */
1025 ir_binop_any_nequal
,
1035 /* Note: The following block of expression types actually convert
1036 * to multiple IR instructions.
1038 ir_binop_mul
, /* ast_mul_assign */
1039 ir_binop_div
, /* ast_div_assign */
1040 ir_binop_mod
, /* ast_mod_assign */
1041 ir_binop_add
, /* ast_add_assign */
1042 ir_binop_sub
, /* ast_sub_assign */
1043 ir_binop_lshift
, /* ast_ls_assign */
1044 ir_binop_rshift
, /* ast_rs_assign */
1045 ir_binop_bit_and
, /* ast_and_assign */
1046 ir_binop_bit_xor
, /* ast_xor_assign */
1047 ir_binop_bit_or
, /* ast_or_assign */
1049 -1, /* ast_conditional doesn't convert to ir_expression. */
1050 ir_binop_add
, /* ast_pre_inc. */
1051 ir_binop_sub
, /* ast_pre_dec. */
1052 ir_binop_add
, /* ast_post_inc. */
1053 ir_binop_sub
, /* ast_post_dec. */
1054 -1, /* ast_field_selection doesn't conv to ir_expression. */
1055 -1, /* ast_array_index doesn't convert to ir_expression. */
1056 -1, /* ast_function_call doesn't conv to ir_expression. */
1057 -1, /* ast_identifier doesn't convert to ir_expression. */
1058 -1, /* ast_int_constant doesn't convert to ir_expression. */
1059 -1, /* ast_uint_constant doesn't conv to ir_expression. */
1060 -1, /* ast_float_constant doesn't conv to ir_expression. */
1061 -1, /* ast_bool_constant doesn't conv to ir_expression. */
1062 -1, /* ast_sequence doesn't convert to ir_expression. */
1064 ir_rvalue
*result
= NULL
;
1066 const struct glsl_type
*type
; /* a temporary variable for switch cases */
1067 bool error_emitted
= false;
1070 loc
= this->get_location();
1072 switch (this->oper
) {
1074 assert(!"ast_aggregate: Should never get here.");
1078 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1079 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1081 result
= do_assignment(instructions
, state
,
1082 this->subexpressions
[0]->non_lvalue_description
,
1083 op
[0], op
[1], false,
1084 this->subexpressions
[0]->get_location());
1085 error_emitted
= result
->type
->is_error();
1090 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1092 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1094 error_emitted
= type
->is_error();
1100 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1102 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1104 error_emitted
= type
->is_error();
1106 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1114 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1115 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1117 type
= arithmetic_result_type(op
[0], op
[1],
1118 (this->oper
== ast_mul
),
1120 error_emitted
= type
->is_error();
1122 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1127 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1128 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1130 type
= modulus_result_type(op
[0]->type
, op
[1]->type
, state
, & loc
);
1132 assert(operations
[this->oper
] == ir_binop_mod
);
1134 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1136 error_emitted
= type
->is_error();
1141 if (!state
->check_bitwise_operations_allowed(&loc
)) {
1142 error_emitted
= true;
1145 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1146 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1147 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1149 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1151 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1158 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1159 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1161 type
= relational_result_type(op
[0], op
[1], state
, & loc
);
1163 /* The relational operators must either generate an error or result
1164 * in a scalar boolean. See page 57 of the GLSL 1.50 spec.
1166 assert(type
->is_error()
1167 || ((type
->base_type
== GLSL_TYPE_BOOL
)
1168 && type
->is_scalar()));
1170 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1172 error_emitted
= type
->is_error();
1177 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1178 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1180 /* From page 58 (page 64 of the PDF) of the GLSL 1.50 spec:
1182 * "The equality operators equal (==), and not equal (!=)
1183 * operate on all types. They result in a scalar Boolean. If
1184 * the operand types do not match, then there must be a
1185 * conversion from Section 4.1.10 "Implicit Conversions"
1186 * applied to one operand that can make them match, in which
1187 * case this conversion is done."
1189 if ((!apply_implicit_conversion(op
[0]->type
, op
[1], state
)
1190 && !apply_implicit_conversion(op
[1]->type
, op
[0], state
))
1191 || (op
[0]->type
!= op
[1]->type
)) {
1192 _mesa_glsl_error(& loc
, state
, "operands of `%s' must have the same "
1193 "type", (this->oper
== ast_equal
) ? "==" : "!=");
1194 error_emitted
= true;
1195 } else if ((op
[0]->type
->is_array() || op
[1]->type
->is_array()) &&
1196 !state
->check_version(120, 300, &loc
,
1197 "array comparisons forbidden")) {
1198 error_emitted
= true;
1201 if (error_emitted
) {
1202 result
= new(ctx
) ir_constant(false);
1204 result
= do_comparison(ctx
, operations
[this->oper
], op
[0], op
[1]);
1205 assert(result
->type
== glsl_type::bool_type
);
1212 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1213 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1214 type
= bit_logic_result_type(op
[0]->type
, op
[1]->type
, this->oper
,
1216 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1218 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1222 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1224 if (!state
->check_bitwise_operations_allowed(&loc
)) {
1225 error_emitted
= true;
1228 if (!op
[0]->type
->is_integer()) {
1229 _mesa_glsl_error(&loc
, state
, "operand of `~' must be an integer");
1230 error_emitted
= true;
1233 type
= error_emitted
? glsl_type::error_type
: op
[0]->type
;
1234 result
= new(ctx
) ir_expression(ir_unop_bit_not
, type
, op
[0], NULL
);
1237 case ast_logic_and
: {
1238 exec_list rhs_instructions
;
1239 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1240 "LHS", &error_emitted
);
1241 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1242 "RHS", &error_emitted
);
1244 if (rhs_instructions
.is_empty()) {
1245 result
= new(ctx
) ir_expression(ir_binop_logic_and
, op
[0], op
[1]);
1246 type
= result
->type
;
1248 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1251 instructions
->push_tail(tmp
);
1253 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1254 instructions
->push_tail(stmt
);
1256 stmt
->then_instructions
.append_list(&rhs_instructions
);
1257 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1258 ir_assignment
*const then_assign
=
1259 new(ctx
) ir_assignment(then_deref
, op
[1]);
1260 stmt
->then_instructions
.push_tail(then_assign
);
1262 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1263 ir_assignment
*const else_assign
=
1264 new(ctx
) ir_assignment(else_deref
, new(ctx
) ir_constant(false));
1265 stmt
->else_instructions
.push_tail(else_assign
);
1267 result
= new(ctx
) ir_dereference_variable(tmp
);
1273 case ast_logic_or
: {
1274 exec_list rhs_instructions
;
1275 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1276 "LHS", &error_emitted
);
1277 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1278 "RHS", &error_emitted
);
1280 if (rhs_instructions
.is_empty()) {
1281 result
= new(ctx
) ir_expression(ir_binop_logic_or
, op
[0], op
[1]);
1282 type
= result
->type
;
1284 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1287 instructions
->push_tail(tmp
);
1289 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1290 instructions
->push_tail(stmt
);
1292 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1293 ir_assignment
*const then_assign
=
1294 new(ctx
) ir_assignment(then_deref
, new(ctx
) ir_constant(true));
1295 stmt
->then_instructions
.push_tail(then_assign
);
1297 stmt
->else_instructions
.append_list(&rhs_instructions
);
1298 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1299 ir_assignment
*const else_assign
=
1300 new(ctx
) ir_assignment(else_deref
, op
[1]);
1301 stmt
->else_instructions
.push_tail(else_assign
);
1303 result
= new(ctx
) ir_dereference_variable(tmp
);
1310 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1312 * "The logical binary operators and (&&), or ( | | ), and
1313 * exclusive or (^^). They operate only on two Boolean
1314 * expressions and result in a Boolean expression."
1316 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0, "LHS",
1318 op
[1] = get_scalar_boolean_operand(instructions
, state
, this, 1, "RHS",
1321 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1326 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1327 "operand", &error_emitted
);
1329 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1333 case ast_mul_assign
:
1334 case ast_div_assign
:
1335 case ast_add_assign
:
1336 case ast_sub_assign
: {
1337 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1338 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1340 type
= arithmetic_result_type(op
[0], op
[1],
1341 (this->oper
== ast_mul_assign
),
1344 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1347 result
= do_assignment(instructions
, state
,
1348 this->subexpressions
[0]->non_lvalue_description
,
1349 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1350 this->subexpressions
[0]->get_location());
1351 error_emitted
= (op
[0]->type
->is_error());
1353 /* GLSL 1.10 does not allow array assignment. However, we don't have to
1354 * explicitly test for this because none of the binary expression
1355 * operators allow array operands either.
1361 case ast_mod_assign
: {
1362 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1363 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1365 type
= modulus_result_type(op
[0]->type
, op
[1]->type
, state
, & loc
);
1367 assert(operations
[this->oper
] == ir_binop_mod
);
1369 ir_rvalue
*temp_rhs
;
1370 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1373 result
= do_assignment(instructions
, state
,
1374 this->subexpressions
[0]->non_lvalue_description
,
1375 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1376 this->subexpressions
[0]->get_location());
1377 error_emitted
= type
->is_error();
1382 case ast_rs_assign
: {
1383 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1384 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1385 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1387 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1388 type
, op
[0], op
[1]);
1389 result
= do_assignment(instructions
, state
,
1390 this->subexpressions
[0]->non_lvalue_description
,
1391 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1392 this->subexpressions
[0]->get_location());
1393 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1397 case ast_and_assign
:
1398 case ast_xor_assign
:
1399 case ast_or_assign
: {
1400 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1401 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1402 type
= bit_logic_result_type(op
[0]->type
, op
[1]->type
, this->oper
,
1404 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1405 type
, op
[0], op
[1]);
1406 result
= do_assignment(instructions
, state
,
1407 this->subexpressions
[0]->non_lvalue_description
,
1408 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1409 this->subexpressions
[0]->get_location());
1410 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1414 case ast_conditional
: {
1415 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1417 * "The ternary selection operator (?:). It operates on three
1418 * expressions (exp1 ? exp2 : exp3). This operator evaluates the
1419 * first expression, which must result in a scalar Boolean."
1421 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1422 "condition", &error_emitted
);
1424 /* The :? operator is implemented by generating an anonymous temporary
1425 * followed by an if-statement. The last instruction in each branch of
1426 * the if-statement assigns a value to the anonymous temporary. This
1427 * temporary is the r-value of the expression.
1429 exec_list then_instructions
;
1430 exec_list else_instructions
;
1432 op
[1] = this->subexpressions
[1]->hir(&then_instructions
, state
);
1433 op
[2] = this->subexpressions
[2]->hir(&else_instructions
, state
);
1435 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1437 * "The second and third expressions can be any type, as
1438 * long their types match, or there is a conversion in
1439 * Section 4.1.10 "Implicit Conversions" that can be applied
1440 * to one of the expressions to make their types match. This
1441 * resulting matching type is the type of the entire
1444 if ((!apply_implicit_conversion(op
[1]->type
, op
[2], state
)
1445 && !apply_implicit_conversion(op
[2]->type
, op
[1], state
))
1446 || (op
[1]->type
!= op
[2]->type
)) {
1447 YYLTYPE loc
= this->subexpressions
[1]->get_location();
1449 _mesa_glsl_error(& loc
, state
, "second and third operands of ?: "
1450 "operator must have matching types");
1451 error_emitted
= true;
1452 type
= glsl_type::error_type
;
1457 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1459 * "The second and third expressions must be the same type, but can
1460 * be of any type other than an array."
1462 if (type
->is_array() &&
1463 !state
->check_version(120, 300, &loc
,
1464 "second and third operands of ?: operator "
1465 "cannot be arrays")) {
1466 error_emitted
= true;
1469 ir_constant
*cond_val
= op
[0]->constant_expression_value();
1470 ir_constant
*then_val
= op
[1]->constant_expression_value();
1471 ir_constant
*else_val
= op
[2]->constant_expression_value();
1473 if (then_instructions
.is_empty()
1474 && else_instructions
.is_empty()
1475 && (cond_val
!= NULL
) && (then_val
!= NULL
) && (else_val
!= NULL
)) {
1476 result
= (cond_val
->value
.b
[0]) ? then_val
: else_val
;
1478 ir_variable
*const tmp
=
1479 new(ctx
) ir_variable(type
, "conditional_tmp", ir_var_temporary
);
1480 instructions
->push_tail(tmp
);
1482 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1483 instructions
->push_tail(stmt
);
1485 then_instructions
.move_nodes_to(& stmt
->then_instructions
);
1486 ir_dereference
*const then_deref
=
1487 new(ctx
) ir_dereference_variable(tmp
);
1488 ir_assignment
*const then_assign
=
1489 new(ctx
) ir_assignment(then_deref
, op
[1]);
1490 stmt
->then_instructions
.push_tail(then_assign
);
1492 else_instructions
.move_nodes_to(& stmt
->else_instructions
);
1493 ir_dereference
*const else_deref
=
1494 new(ctx
) ir_dereference_variable(tmp
);
1495 ir_assignment
*const else_assign
=
1496 new(ctx
) ir_assignment(else_deref
, op
[2]);
1497 stmt
->else_instructions
.push_tail(else_assign
);
1499 result
= new(ctx
) ir_dereference_variable(tmp
);
1506 this->non_lvalue_description
= (this->oper
== ast_pre_inc
)
1507 ? "pre-increment operation" : "pre-decrement operation";
1509 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1510 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1512 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1514 ir_rvalue
*temp_rhs
;
1515 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1518 result
= do_assignment(instructions
, state
,
1519 this->subexpressions
[0]->non_lvalue_description
,
1520 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1521 this->subexpressions
[0]->get_location());
1522 error_emitted
= op
[0]->type
->is_error();
1527 case ast_post_dec
: {
1528 this->non_lvalue_description
= (this->oper
== ast_post_inc
)
1529 ? "post-increment operation" : "post-decrement operation";
1530 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1531 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1533 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1535 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1537 ir_rvalue
*temp_rhs
;
1538 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1541 /* Get a temporary of a copy of the lvalue before it's modified.
1542 * This may get thrown away later.
1544 result
= get_lvalue_copy(instructions
, op
[0]->clone(ctx
, NULL
));
1546 (void)do_assignment(instructions
, state
,
1547 this->subexpressions
[0]->non_lvalue_description
,
1548 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1549 this->subexpressions
[0]->get_location());
1551 error_emitted
= op
[0]->type
->is_error();
1555 case ast_field_selection
:
1556 result
= _mesa_ast_field_selection_to_hir(this, instructions
, state
);
1559 case ast_array_index
: {
1560 YYLTYPE index_loc
= subexpressions
[1]->get_location();
1562 op
[0] = subexpressions
[0]->hir(instructions
, state
);
1563 op
[1] = subexpressions
[1]->hir(instructions
, state
);
1565 result
= _mesa_ast_array_index_to_hir(ctx
, state
, op
[0], op
[1],
1568 if (result
->type
->is_error())
1569 error_emitted
= true;
1574 case ast_function_call
:
1575 /* Should *NEVER* get here. ast_function_call should always be handled
1576 * by ast_function_expression::hir.
1581 case ast_identifier
: {
1582 /* ast_identifier can appear several places in a full abstract syntax
1583 * tree. This particular use must be at location specified in the grammar
1584 * as 'variable_identifier'.
1587 state
->symbols
->get_variable(this->primary_expression
.identifier
);
1591 result
= new(ctx
) ir_dereference_variable(var
);
1593 _mesa_glsl_error(& loc
, state
, "`%s' undeclared",
1594 this->primary_expression
.identifier
);
1596 result
= ir_rvalue::error_value(ctx
);
1597 error_emitted
= true;
1602 case ast_int_constant
:
1603 result
= new(ctx
) ir_constant(this->primary_expression
.int_constant
);
1606 case ast_uint_constant
:
1607 result
= new(ctx
) ir_constant(this->primary_expression
.uint_constant
);
1610 case ast_float_constant
:
1611 result
= new(ctx
) ir_constant(this->primary_expression
.float_constant
);
1614 case ast_bool_constant
:
1615 result
= new(ctx
) ir_constant(bool(this->primary_expression
.bool_constant
));
1618 case ast_sequence
: {
1619 /* It should not be possible to generate a sequence in the AST without
1620 * any expressions in it.
1622 assert(!this->expressions
.is_empty());
1624 /* The r-value of a sequence is the last expression in the sequence. If
1625 * the other expressions in the sequence do not have side-effects (and
1626 * therefore add instructions to the instruction list), they get dropped
1629 exec_node
*previous_tail_pred
= NULL
;
1630 YYLTYPE previous_operand_loc
= loc
;
1632 foreach_list_typed (ast_node
, ast
, link
, &this->expressions
) {
1633 /* If one of the operands of comma operator does not generate any
1634 * code, we want to emit a warning. At each pass through the loop
1635 * previous_tail_pred will point to the last instruction in the
1636 * stream *before* processing the previous operand. Naturally,
1637 * instructions->tail_pred will point to the last instruction in the
1638 * stream *after* processing the previous operand. If the two
1639 * pointers match, then the previous operand had no effect.
1641 * The warning behavior here differs slightly from GCC. GCC will
1642 * only emit a warning if none of the left-hand operands have an
1643 * effect. However, it will emit a warning for each. I believe that
1644 * there are some cases in C (especially with GCC extensions) where
1645 * it is useful to have an intermediate step in a sequence have no
1646 * effect, but I don't think these cases exist in GLSL. Either way,
1647 * it would be a giant hassle to replicate that behavior.
1649 if (previous_tail_pred
== instructions
->tail_pred
) {
1650 _mesa_glsl_warning(&previous_operand_loc
, state
,
1651 "left-hand operand of comma expression has "
1655 /* tail_pred is directly accessed instead of using the get_tail()
1656 * method for performance reasons. get_tail() has extra code to
1657 * return NULL when the list is empty. We don't care about that
1658 * here, so using tail_pred directly is fine.
1660 previous_tail_pred
= instructions
->tail_pred
;
1661 previous_operand_loc
= ast
->get_location();
1663 result
= ast
->hir(instructions
, state
);
1666 /* Any errors should have already been emitted in the loop above.
1668 error_emitted
= true;
1672 type
= NULL
; /* use result->type, not type. */
1673 assert(result
!= NULL
);
1675 if (result
->type
->is_error() && !error_emitted
)
1676 _mesa_glsl_error(& loc
, state
, "type mismatch");
1683 ast_expression_statement::hir(exec_list
*instructions
,
1684 struct _mesa_glsl_parse_state
*state
)
1686 /* It is possible to have expression statements that don't have an
1687 * expression. This is the solitary semicolon:
1689 * for (i = 0; i < 5; i++)
1692 * In this case the expression will be NULL. Test for NULL and don't do
1693 * anything in that case.
1695 if (expression
!= NULL
)
1696 expression
->hir(instructions
, state
);
1698 /* Statements do not have r-values.
1705 ast_compound_statement::hir(exec_list
*instructions
,
1706 struct _mesa_glsl_parse_state
*state
)
1709 state
->symbols
->push_scope();
1711 foreach_list_typed (ast_node
, ast
, link
, &this->statements
)
1712 ast
->hir(instructions
, state
);
1715 state
->symbols
->pop_scope();
1717 /* Compound statements do not have r-values.
1723 static const glsl_type
*
1724 process_array_type(YYLTYPE
*loc
, const glsl_type
*base
, ast_node
*array_size
,
1725 struct _mesa_glsl_parse_state
*state
)
1727 unsigned length
= 0;
1730 return glsl_type::error_type
;
1732 /* From page 19 (page 25) of the GLSL 1.20 spec:
1734 * "Only one-dimensional arrays may be declared."
1736 if (base
->is_array()) {
1737 _mesa_glsl_error(loc
, state
,
1738 "invalid array of `%s' (only one-dimensional arrays "
1741 return glsl_type::error_type
;
1744 if (array_size
!= NULL
) {
1745 exec_list dummy_instructions
;
1746 ir_rvalue
*const ir
= array_size
->hir(& dummy_instructions
, state
);
1747 YYLTYPE loc
= array_size
->get_location();
1750 if (!ir
->type
->is_integer()) {
1751 _mesa_glsl_error(& loc
, state
, "array size must be integer type");
1752 } else if (!ir
->type
->is_scalar()) {
1753 _mesa_glsl_error(& loc
, state
, "array size must be scalar type");
1755 ir_constant
*const size
= ir
->constant_expression_value();
1758 _mesa_glsl_error(& loc
, state
, "array size must be a "
1759 "constant valued expression");
1760 } else if (size
->value
.i
[0] <= 0) {
1761 _mesa_glsl_error(& loc
, state
, "array size must be > 0");
1763 assert(size
->type
== ir
->type
);
1764 length
= size
->value
.u
[0];
1766 /* If the array size is const (and we've verified that
1767 * it is) then no instructions should have been emitted
1768 * when we converted it to HIR. If they were emitted,
1769 * then either the array size isn't const after all, or
1770 * we are emitting unnecessary instructions.
1772 assert(dummy_instructions
.is_empty());
1776 } else if (state
->es_shader
) {
1777 /* Section 10.17 of the GLSL ES 1.00 specification states that unsized
1778 * array declarations have been removed from the language.
1780 _mesa_glsl_error(loc
, state
, "unsized array declarations are not "
1781 "allowed in GLSL ES 1.00");
1784 const glsl_type
*array_type
= glsl_type::get_array_instance(base
, length
);
1785 return array_type
!= NULL
? array_type
: glsl_type::error_type
;
1790 ast_type_specifier::glsl_type(const char **name
,
1791 struct _mesa_glsl_parse_state
*state
) const
1793 const struct glsl_type
*type
;
1795 type
= state
->symbols
->get_type(this->type_name
);
1796 *name
= this->type_name
;
1798 if (this->is_array
) {
1799 YYLTYPE loc
= this->get_location();
1800 type
= process_array_type(&loc
, type
, this->array_size
, state
);
1808 * Determine whether a toplevel variable declaration declares a varying. This
1809 * function operates by examining the variable's mode and the shader target,
1810 * so it correctly identifies linkage variables regardless of whether they are
1811 * declared using the deprecated "varying" syntax or the new "in/out" syntax.
1813 * Passing a non-toplevel variable declaration (e.g. a function parameter) to
1814 * this function will produce undefined results.
1817 is_varying_var(ir_variable
*var
, _mesa_glsl_parser_targets target
)
1821 return var
->mode
== ir_var_shader_out
;
1822 case fragment_shader
:
1823 return var
->mode
== ir_var_shader_in
;
1825 return var
->mode
== ir_var_shader_out
|| var
->mode
== ir_var_shader_in
;
1831 * Matrix layout qualifiers are only allowed on certain types
1834 validate_matrix_layout_for_type(struct _mesa_glsl_parse_state
*state
,
1836 const glsl_type
*type
)
1838 if (!type
->is_matrix() && !type
->is_record()) {
1839 _mesa_glsl_error(loc
, state
,
1840 "uniform block layout qualifiers row_major and "
1841 "column_major can only be applied to matrix and "
1843 } else if (type
->is_record()) {
1844 /* We allow 'layout(row_major)' on structure types because it's the only
1845 * way to get row-major layouts on matrices contained in structures.
1847 _mesa_glsl_warning(loc
, state
,
1848 "uniform block layout qualifiers row_major and "
1849 "column_major applied to structure types is not "
1850 "strictly conformant and my be rejected by other "
1856 validate_binding_qualifier(struct _mesa_glsl_parse_state
*state
,
1859 const ast_type_qualifier
*qual
)
1861 if (var
->mode
!= ir_var_uniform
) {
1862 _mesa_glsl_error(loc
, state
,
1863 "the \"binding\" qualifier only applies to uniforms");
1867 if (qual
->binding
< 0) {
1868 _mesa_glsl_error(loc
, state
, "binding values must be >= 0");
1872 const struct gl_context
*const ctx
= state
->ctx
;
1873 unsigned elements
= var
->type
->is_array() ? var
->type
->length
: 1;
1874 unsigned max_index
= qual
->binding
+ elements
- 1;
1876 if (var
->type
->is_interface()) {
1877 /* UBOs. From page 60 of the GLSL 4.20 specification:
1878 * "If the binding point for any uniform block instance is less than zero,
1879 * or greater than or equal to the implementation-dependent maximum
1880 * number of uniform buffer bindings, a compilation error will occur.
1881 * When the binding identifier is used with a uniform block instanced as
1882 * an array of size N, all elements of the array from binding through
1883 * binding + N – 1 must be within this range."
1885 * The implementation-dependent maximum is GL_MAX_UNIFORM_BUFFER_BINDINGS.
1887 if (max_index
>= ctx
->Const
.MaxUniformBufferBindings
) {
1888 _mesa_glsl_error(loc
, state
, "layout(binding = %d) for %d UBOs exceeds "
1889 "the maximum number of UBO binding points (%d)",
1890 qual
->binding
, elements
,
1891 ctx
->Const
.MaxUniformBufferBindings
);
1894 } else if (var
->type
->is_sampler() ||
1895 (var
->type
->is_array() && var
->type
->fields
.array
->is_sampler())) {
1896 /* Samplers. From page 63 of the GLSL 4.20 specification:
1897 * "If the binding is less than zero, or greater than or equal to the
1898 * implementation-dependent maximum supported number of units, a
1899 * compilation error will occur. When the binding identifier is used
1900 * with an array of size N, all elements of the array from binding
1901 * through binding + N - 1 must be within this range."
1904 switch (state
->target
) {
1906 limit
= ctx
->Const
.VertexProgram
.MaxTextureImageUnits
;
1908 case geometry_shader
:
1909 limit
= ctx
->Const
.GeometryProgram
.MaxTextureImageUnits
;
1911 case fragment_shader
:
1912 limit
= ctx
->Const
.FragmentProgram
.MaxTextureImageUnits
;
1916 if (max_index
>= limit
) {
1917 _mesa_glsl_error(loc
, state
, "layout(binding = %d) for %d samplers "
1918 "exceeds the maximum number of texture image units "
1919 "(%d)", qual
->binding
, elements
, limit
);
1924 _mesa_glsl_error(loc
, state
,
1925 "the \"binding\" qualifier only applies to uniform "
1926 "blocks, samplers, or arrays of samplers");
1934 apply_type_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
1936 struct _mesa_glsl_parse_state
*state
,
1938 bool ubo_qualifiers_valid
,
1941 STATIC_ASSERT(sizeof(qual
->flags
.q
) <= sizeof(qual
->flags
.i
));
1943 if (qual
->flags
.q
.invariant
) {
1945 _mesa_glsl_error(loc
, state
,
1946 "variable `%s' may not be redeclared "
1947 "`invariant' after being used",
1954 if (qual
->flags
.q
.constant
|| qual
->flags
.q
.attribute
1955 || qual
->flags
.q
.uniform
1956 || (qual
->flags
.q
.varying
&& (state
->target
== fragment_shader
)))
1959 if (qual
->flags
.q
.centroid
)
1962 if (qual
->flags
.q
.attribute
&& state
->target
!= vertex_shader
) {
1963 var
->type
= glsl_type::error_type
;
1964 _mesa_glsl_error(loc
, state
,
1965 "`attribute' variables may not be declared in the "
1967 _mesa_glsl_shader_target_name(state
->target
));
1970 /* If there is no qualifier that changes the mode of the variable, leave
1971 * the setting alone.
1973 if (qual
->flags
.q
.in
&& qual
->flags
.q
.out
)
1974 var
->mode
= ir_var_function_inout
;
1975 else if (qual
->flags
.q
.in
)
1976 var
->mode
= is_parameter
? ir_var_function_in
: ir_var_shader_in
;
1977 else if (qual
->flags
.q
.attribute
1978 || (qual
->flags
.q
.varying
&& (state
->target
== fragment_shader
)))
1979 var
->mode
= ir_var_shader_in
;
1980 else if (qual
->flags
.q
.out
)
1981 var
->mode
= is_parameter
? ir_var_function_out
: ir_var_shader_out
;
1982 else if (qual
->flags
.q
.varying
&& (state
->target
== vertex_shader
))
1983 var
->mode
= ir_var_shader_out
;
1984 else if (qual
->flags
.q
.uniform
)
1985 var
->mode
= ir_var_uniform
;
1987 if (!is_parameter
&& is_varying_var(var
, state
->target
)) {
1988 /* This variable is being used to link data between shader stages (in
1989 * pre-glsl-1.30 parlance, it's a "varying"). Check that it has a type
1990 * that is allowed for such purposes.
1992 * From page 25 (page 31 of the PDF) of the GLSL 1.10 spec:
1994 * "The varying qualifier can be used only with the data types
1995 * float, vec2, vec3, vec4, mat2, mat3, and mat4, or arrays of
1998 * This was relaxed in GLSL version 1.30 and GLSL ES version 3.00. From
1999 * page 31 (page 37 of the PDF) of the GLSL 1.30 spec:
2001 * "Fragment inputs can only be signed and unsigned integers and
2002 * integer vectors, float, floating-point vectors, matrices, or
2003 * arrays of these. Structures cannot be input.
2005 * Similar text exists in the section on vertex shader outputs.
2007 * Similar text exists in the GLSL ES 3.00 spec, except that the GLSL ES
2008 * 3.00 spec allows structs as well. Varying structs are also allowed
2011 switch (var
->type
->get_scalar_type()->base_type
) {
2012 case GLSL_TYPE_FLOAT
:
2013 /* Ok in all GLSL versions */
2015 case GLSL_TYPE_UINT
:
2017 if (state
->is_version(130, 300))
2019 _mesa_glsl_error(loc
, state
,
2020 "varying variables must be of base type float in %s",
2021 state
->get_version_string());
2023 case GLSL_TYPE_STRUCT
:
2024 if (state
->is_version(150, 300))
2026 _mesa_glsl_error(loc
, state
,
2027 "varying variables may not be of type struct");
2030 _mesa_glsl_error(loc
, state
, "illegal type for a varying variable");
2035 if (state
->all_invariant
&& (state
->current_function
== NULL
)) {
2036 switch (state
->target
) {
2038 if (var
->mode
== ir_var_shader_out
)
2039 var
->invariant
= true;
2041 case geometry_shader
:
2042 if ((var
->mode
== ir_var_shader_in
)
2043 || (var
->mode
== ir_var_shader_out
))
2044 var
->invariant
= true;
2046 case fragment_shader
:
2047 if (var
->mode
== ir_var_shader_in
)
2048 var
->invariant
= true;
2053 if (qual
->flags
.q
.flat
)
2054 var
->interpolation
= INTERP_QUALIFIER_FLAT
;
2055 else if (qual
->flags
.q
.noperspective
)
2056 var
->interpolation
= INTERP_QUALIFIER_NOPERSPECTIVE
;
2057 else if (qual
->flags
.q
.smooth
)
2058 var
->interpolation
= INTERP_QUALIFIER_SMOOTH
;
2060 var
->interpolation
= INTERP_QUALIFIER_NONE
;
2062 if (var
->interpolation
!= INTERP_QUALIFIER_NONE
&&
2063 ((state
->target
== vertex_shader
&& var
->mode
== ir_var_shader_in
) ||
2064 (state
->target
== fragment_shader
&& var
->mode
== ir_var_shader_out
))) {
2065 _mesa_glsl_error(loc
, state
,
2066 "interpolation qualifier `%s' cannot be applied to "
2067 "vertex shader inputs or fragment shader outputs",
2068 var
->interpolation_string());
2071 var
->pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
2072 var
->origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
2073 if ((qual
->flags
.q
.origin_upper_left
|| qual
->flags
.q
.pixel_center_integer
)
2074 && (strcmp(var
->name
, "gl_FragCoord") != 0)) {
2075 const char *const qual_string
= (qual
->flags
.q
.origin_upper_left
)
2076 ? "origin_upper_left" : "pixel_center_integer";
2078 _mesa_glsl_error(loc
, state
,
2079 "layout qualifier `%s' can only be applied to "
2080 "fragment shader input `gl_FragCoord'",
2084 if (qual
->flags
.q
.explicit_location
) {
2085 const bool global_scope
= (state
->current_function
== NULL
);
2087 const char *string
= "";
2089 /* In the vertex shader only shader inputs can be given explicit
2092 * In the fragment shader only shader outputs can be given explicit
2095 switch (state
->target
) {
2097 if (!global_scope
|| (var
->mode
!= ir_var_shader_in
)) {
2103 case geometry_shader
:
2104 _mesa_glsl_error(loc
, state
,
2105 "geometry shader variables cannot be given "
2106 "explicit locations");
2109 case fragment_shader
:
2110 if (!global_scope
|| (var
->mode
!= ir_var_shader_out
)) {
2118 _mesa_glsl_error(loc
, state
,
2119 "only %s shader %s variables can be given an "
2120 "explicit location",
2121 _mesa_glsl_shader_target_name(state
->target
),
2124 var
->explicit_location
= true;
2126 /* This bit of silliness is needed because invalid explicit locations
2127 * are supposed to be flagged during linking. Small negative values
2128 * biased by VERT_ATTRIB_GENERIC0 or FRAG_RESULT_DATA0 could alias
2129 * built-in values (e.g., -16+VERT_ATTRIB_GENERIC0 = VERT_ATTRIB_POS).
2130 * The linker needs to be able to differentiate these cases. This
2131 * ensures that negative values stay negative.
2133 if (qual
->location
>= 0) {
2134 var
->location
= (state
->target
== vertex_shader
)
2135 ? (qual
->location
+ VERT_ATTRIB_GENERIC0
)
2136 : (qual
->location
+ FRAG_RESULT_DATA0
);
2138 var
->location
= qual
->location
;
2141 if (qual
->flags
.q
.explicit_index
) {
2142 /* From the GLSL 4.30 specification, section 4.4.2 (Output
2143 * Layout Qualifiers):
2145 * "It is also a compile-time error if a fragment shader
2146 * sets a layout index to less than 0 or greater than 1."
2148 * Older specifications don't mandate a behavior; we take
2149 * this as a clarification and always generate the error.
2151 if (qual
->index
< 0 || qual
->index
> 1) {
2152 _mesa_glsl_error(loc
, state
,
2153 "explicit index may only be 0 or 1");
2155 var
->explicit_index
= true;
2156 var
->index
= qual
->index
;
2160 } else if (qual
->flags
.q
.explicit_index
) {
2161 _mesa_glsl_error(loc
, state
,
2162 "explicit index requires explicit location");
2165 if (qual
->flags
.q
.explicit_binding
&&
2166 validate_binding_qualifier(state
, loc
, var
, qual
)) {
2167 var
->explicit_binding
= true;
2168 var
->binding
= qual
->binding
;
2171 /* Does the declaration use the deprecated 'attribute' or 'varying'
2174 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
2175 || qual
->flags
.q
.varying
;
2177 /* Is the 'layout' keyword used with parameters that allow relaxed checking.
2178 * Many implementations of GL_ARB_fragment_coord_conventions_enable and some
2179 * implementations (only Mesa?) GL_ARB_explicit_attrib_location_enable
2180 * allowed the layout qualifier to be used with 'varying' and 'attribute'.
2181 * These extensions and all following extensions that add the 'layout'
2182 * keyword have been modified to require the use of 'in' or 'out'.
2184 * The following extension do not allow the deprecated keywords:
2186 * GL_AMD_conservative_depth
2187 * GL_ARB_conservative_depth
2188 * GL_ARB_gpu_shader5
2189 * GL_ARB_separate_shader_objects
2190 * GL_ARB_tesselation_shader
2191 * GL_ARB_transform_feedback3
2192 * GL_ARB_uniform_buffer_object
2194 * It is unknown whether GL_EXT_shader_image_load_store or GL_NV_gpu_shader5
2195 * allow layout with the deprecated keywords.
2197 const bool relaxed_layout_qualifier_checking
=
2198 state
->ARB_fragment_coord_conventions_enable
;
2200 if (qual
->has_layout() && uses_deprecated_qualifier
) {
2201 if (relaxed_layout_qualifier_checking
) {
2202 _mesa_glsl_warning(loc
, state
,
2203 "`layout' qualifier may not be used with "
2204 "`attribute' or `varying'");
2206 _mesa_glsl_error(loc
, state
,
2207 "`layout' qualifier may not be used with "
2208 "`attribute' or `varying'");
2212 /* Layout qualifiers for gl_FragDepth, which are enabled by extension
2213 * AMD_conservative_depth.
2215 int depth_layout_count
= qual
->flags
.q
.depth_any
2216 + qual
->flags
.q
.depth_greater
2217 + qual
->flags
.q
.depth_less
2218 + qual
->flags
.q
.depth_unchanged
;
2219 if (depth_layout_count
> 0
2220 && !state
->AMD_conservative_depth_enable
2221 && !state
->ARB_conservative_depth_enable
) {
2222 _mesa_glsl_error(loc
, state
,
2223 "extension GL_AMD_conservative_depth or "
2224 "GL_ARB_conservative_depth must be enabled "
2225 "to use depth layout qualifiers");
2226 } else if (depth_layout_count
> 0
2227 && strcmp(var
->name
, "gl_FragDepth") != 0) {
2228 _mesa_glsl_error(loc
, state
,
2229 "depth layout qualifiers can be applied only to "
2231 } else if (depth_layout_count
> 1
2232 && strcmp(var
->name
, "gl_FragDepth") == 0) {
2233 _mesa_glsl_error(loc
, state
,
2234 "at most one depth layout qualifier can be applied to "
2237 if (qual
->flags
.q
.depth_any
)
2238 var
->depth_layout
= ir_depth_layout_any
;
2239 else if (qual
->flags
.q
.depth_greater
)
2240 var
->depth_layout
= ir_depth_layout_greater
;
2241 else if (qual
->flags
.q
.depth_less
)
2242 var
->depth_layout
= ir_depth_layout_less
;
2243 else if (qual
->flags
.q
.depth_unchanged
)
2244 var
->depth_layout
= ir_depth_layout_unchanged
;
2246 var
->depth_layout
= ir_depth_layout_none
;
2248 if (qual
->flags
.q
.std140
||
2249 qual
->flags
.q
.packed
||
2250 qual
->flags
.q
.shared
) {
2251 _mesa_glsl_error(loc
, state
,
2252 "uniform block layout qualifiers std140, packed, and "
2253 "shared can only be applied to uniform blocks, not "
2257 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
2258 if (!ubo_qualifiers_valid
) {
2259 _mesa_glsl_error(loc
, state
,
2260 "uniform block layout qualifiers row_major and "
2261 "column_major can only be applied to uniform block "
2264 validate_matrix_layout_for_type(state
, loc
, var
->type
);
2269 * Get the variable that is being redeclared by this declaration
2271 * Semantic checks to verify the validity of the redeclaration are also
2272 * performed. If semantic checks fail, compilation error will be emitted via
2273 * \c _mesa_glsl_error, but a non-\c NULL pointer will still be returned.
2276 * A pointer to an existing variable in the current scope if the declaration
2277 * is a redeclaration, \c NULL otherwise.
2280 get_variable_being_redeclared(ir_variable
*var
, ast_declaration
*decl
,
2281 struct _mesa_glsl_parse_state
*state
)
2283 /* Check if this declaration is actually a re-declaration, either to
2284 * resize an array or add qualifiers to an existing variable.
2286 * This is allowed for variables in the current scope, or when at
2287 * global scope (for built-ins in the implicit outer scope).
2289 ir_variable
*earlier
= state
->symbols
->get_variable(decl
->identifier
);
2290 if (earlier
== NULL
||
2291 (state
->current_function
!= NULL
&&
2292 !state
->symbols
->name_declared_this_scope(decl
->identifier
))) {
2297 YYLTYPE loc
= decl
->get_location();
2299 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec,
2301 * "It is legal to declare an array without a size and then
2302 * later re-declare the same name as an array of the same
2303 * type and specify a size."
2305 if ((earlier
->type
->array_size() == 0)
2306 && var
->type
->is_array()
2307 && (var
->type
->element_type() == earlier
->type
->element_type())) {
2308 /* FINISHME: This doesn't match the qualifiers on the two
2309 * FINISHME: declarations. It's not 100% clear whether this is
2310 * FINISHME: required or not.
2313 const unsigned size
= unsigned(var
->type
->array_size());
2314 check_builtin_array_max_size(var
->name
, size
, loc
, state
);
2315 if ((size
> 0) && (size
<= earlier
->max_array_access
)) {
2316 _mesa_glsl_error(& loc
, state
, "array size must be > %u due to "
2318 earlier
->max_array_access
);
2321 earlier
->type
= var
->type
;
2324 } else if (state
->ARB_fragment_coord_conventions_enable
2325 && strcmp(var
->name
, "gl_FragCoord") == 0
2326 && earlier
->type
== var
->type
2327 && earlier
->mode
== var
->mode
) {
2328 /* Allow redeclaration of gl_FragCoord for ARB_fcc layout
2331 earlier
->origin_upper_left
= var
->origin_upper_left
;
2332 earlier
->pixel_center_integer
= var
->pixel_center_integer
;
2334 /* According to section 4.3.7 of the GLSL 1.30 spec,
2335 * the following built-in varaibles can be redeclared with an
2336 * interpolation qualifier:
2339 * * gl_FrontSecondaryColor
2340 * * gl_BackSecondaryColor
2342 * * gl_SecondaryColor
2344 } else if (state
->is_version(130, 0)
2345 && (strcmp(var
->name
, "gl_FrontColor") == 0
2346 || strcmp(var
->name
, "gl_BackColor") == 0
2347 || strcmp(var
->name
, "gl_FrontSecondaryColor") == 0
2348 || strcmp(var
->name
, "gl_BackSecondaryColor") == 0
2349 || strcmp(var
->name
, "gl_Color") == 0
2350 || strcmp(var
->name
, "gl_SecondaryColor") == 0)
2351 && earlier
->type
== var
->type
2352 && earlier
->mode
== var
->mode
) {
2353 earlier
->interpolation
= var
->interpolation
;
2355 /* Layout qualifiers for gl_FragDepth. */
2356 } else if ((state
->AMD_conservative_depth_enable
||
2357 state
->ARB_conservative_depth_enable
)
2358 && strcmp(var
->name
, "gl_FragDepth") == 0
2359 && earlier
->type
== var
->type
2360 && earlier
->mode
== var
->mode
) {
2362 /** From the AMD_conservative_depth spec:
2363 * Within any shader, the first redeclarations of gl_FragDepth
2364 * must appear before any use of gl_FragDepth.
2366 if (earlier
->used
) {
2367 _mesa_glsl_error(&loc
, state
,
2368 "the first redeclaration of gl_FragDepth "
2369 "must appear before any use of gl_FragDepth");
2372 /* Prevent inconsistent redeclaration of depth layout qualifier. */
2373 if (earlier
->depth_layout
!= ir_depth_layout_none
2374 && earlier
->depth_layout
!= var
->depth_layout
) {
2375 _mesa_glsl_error(&loc
, state
,
2376 "gl_FragDepth: depth layout is declared here "
2377 "as '%s, but it was previously declared as "
2379 depth_layout_string(var
->depth_layout
),
2380 depth_layout_string(earlier
->depth_layout
));
2383 earlier
->depth_layout
= var
->depth_layout
;
2386 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", decl
->identifier
);
2393 * Generate the IR for an initializer in a variable declaration
2396 process_initializer(ir_variable
*var
, ast_declaration
*decl
,
2397 ast_fully_specified_type
*type
,
2398 exec_list
*initializer_instructions
,
2399 struct _mesa_glsl_parse_state
*state
)
2401 ir_rvalue
*result
= NULL
;
2403 YYLTYPE initializer_loc
= decl
->initializer
->get_location();
2405 /* From page 24 (page 30 of the PDF) of the GLSL 1.10 spec:
2407 * "All uniform variables are read-only and are initialized either
2408 * directly by an application via API commands, or indirectly by
2411 if (var
->mode
== ir_var_uniform
) {
2412 state
->check_version(120, 0, &initializer_loc
,
2413 "cannot initialize uniforms");
2416 if (var
->type
->is_sampler()) {
2417 _mesa_glsl_error(& initializer_loc
, state
,
2418 "cannot initialize samplers");
2421 if ((var
->mode
== ir_var_shader_in
) && (state
->current_function
== NULL
)) {
2422 _mesa_glsl_error(& initializer_loc
, state
,
2423 "cannot initialize %s shader input / %s",
2424 _mesa_glsl_shader_target_name(state
->target
),
2425 (state
->target
== vertex_shader
)
2426 ? "attribute" : "varying");
2429 ir_dereference
*const lhs
= new(state
) ir_dereference_variable(var
);
2430 ir_rvalue
*rhs
= decl
->initializer
->hir(initializer_instructions
,
2433 /* Calculate the constant value if this is a const or uniform
2436 if (type
->qualifier
.flags
.q
.constant
2437 || type
->qualifier
.flags
.q
.uniform
) {
2438 ir_rvalue
*new_rhs
= validate_assignment(state
, var
->type
, rhs
, true);
2439 if (new_rhs
!= NULL
) {
2442 ir_constant
*constant_value
= rhs
->constant_expression_value();
2443 if (!constant_value
) {
2444 /* If ARB_shading_language_420pack is enabled, initializers of
2445 * const-qualified local variables do not have to be constant
2446 * expressions. Const-qualified global variables must still be
2447 * initialized with constant expressions.
2449 if (!state
->ARB_shading_language_420pack_enable
2450 || state
->current_function
== NULL
) {
2451 _mesa_glsl_error(& initializer_loc
, state
,
2452 "initializer of %s variable `%s' must be a "
2453 "constant expression",
2454 (type
->qualifier
.flags
.q
.constant
)
2455 ? "const" : "uniform",
2457 if (var
->type
->is_numeric()) {
2458 /* Reduce cascading errors. */
2459 var
->constant_value
= ir_constant::zero(state
, var
->type
);
2463 rhs
= constant_value
;
2464 var
->constant_value
= constant_value
;
2467 _mesa_glsl_error(&initializer_loc
, state
,
2468 "initializer of type %s cannot be assigned to "
2469 "variable of type %s",
2470 rhs
->type
->name
, var
->type
->name
);
2471 if (var
->type
->is_numeric()) {
2472 /* Reduce cascading errors. */
2473 var
->constant_value
= ir_constant::zero(state
, var
->type
);
2478 if (rhs
&& !rhs
->type
->is_error()) {
2479 bool temp
= var
->read_only
;
2480 if (type
->qualifier
.flags
.q
.constant
)
2481 var
->read_only
= false;
2483 /* Never emit code to initialize a uniform.
2485 const glsl_type
*initializer_type
;
2486 if (!type
->qualifier
.flags
.q
.uniform
) {
2487 result
= do_assignment(initializer_instructions
, state
,
2490 type
->get_location());
2491 initializer_type
= result
->type
;
2493 initializer_type
= rhs
->type
;
2495 var
->constant_initializer
= rhs
->constant_expression_value();
2496 var
->has_initializer
= true;
2498 /* If the declared variable is an unsized array, it must inherrit
2499 * its full type from the initializer. A declaration such as
2501 * uniform float a[] = float[](1.0, 2.0, 3.0, 3.0);
2505 * uniform float a[4] = float[](1.0, 2.0, 3.0, 3.0);
2507 * The assignment generated in the if-statement (below) will also
2508 * automatically handle this case for non-uniforms.
2510 * If the declared variable is not an array, the types must
2511 * already match exactly. As a result, the type assignment
2512 * here can be done unconditionally. For non-uniforms the call
2513 * to do_assignment can change the type of the initializer (via
2514 * the implicit conversion rules). For uniforms the initializer
2515 * must be a constant expression, and the type of that expression
2516 * was validated above.
2518 var
->type
= initializer_type
;
2520 var
->read_only
= temp
;
2527 ast_declarator_list::hir(exec_list
*instructions
,
2528 struct _mesa_glsl_parse_state
*state
)
2531 const struct glsl_type
*decl_type
;
2532 const char *type_name
= NULL
;
2533 ir_rvalue
*result
= NULL
;
2534 YYLTYPE loc
= this->get_location();
2536 /* From page 46 (page 52 of the PDF) of the GLSL 1.50 spec:
2538 * "To ensure that a particular output variable is invariant, it is
2539 * necessary to use the invariant qualifier. It can either be used to
2540 * qualify a previously declared variable as being invariant
2542 * invariant gl_Position; // make existing gl_Position be invariant"
2544 * In these cases the parser will set the 'invariant' flag in the declarator
2545 * list, and the type will be NULL.
2547 if (this->invariant
) {
2548 assert(this->type
== NULL
);
2550 if (state
->current_function
!= NULL
) {
2551 _mesa_glsl_error(& loc
, state
,
2552 "all uses of `invariant' keyword must be at global "
2556 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
2557 assert(!decl
->is_array
);
2558 assert(decl
->array_size
== NULL
);
2559 assert(decl
->initializer
== NULL
);
2561 ir_variable
*const earlier
=
2562 state
->symbols
->get_variable(decl
->identifier
);
2563 if (earlier
== NULL
) {
2564 _mesa_glsl_error(& loc
, state
,
2565 "undeclared variable `%s' cannot be marked "
2566 "invariant", decl
->identifier
);
2567 } else if ((state
->target
== vertex_shader
)
2568 && (earlier
->mode
!= ir_var_shader_out
)) {
2569 _mesa_glsl_error(& loc
, state
,
2570 "`%s' cannot be marked invariant, vertex shader "
2571 "outputs only", decl
->identifier
);
2572 } else if ((state
->target
== fragment_shader
)
2573 && (earlier
->mode
!= ir_var_shader_in
)) {
2574 _mesa_glsl_error(& loc
, state
,
2575 "`%s' cannot be marked invariant, fragment shader "
2576 "inputs only", decl
->identifier
);
2577 } else if (earlier
->used
) {
2578 _mesa_glsl_error(& loc
, state
,
2579 "variable `%s' may not be redeclared "
2580 "`invariant' after being used",
2583 earlier
->invariant
= true;
2587 /* Invariant redeclarations do not have r-values.
2592 assert(this->type
!= NULL
);
2593 assert(!this->invariant
);
2595 /* The type specifier may contain a structure definition. Process that
2596 * before any of the variable declarations.
2598 (void) this->type
->specifier
->hir(instructions
, state
);
2600 decl_type
= this->type
->specifier
->glsl_type(& type_name
, state
);
2601 if (this->declarations
.is_empty()) {
2602 /* If there is no structure involved in the program text, there are two
2603 * possible scenarios:
2605 * - The program text contained something like 'vec4;'. This is an
2606 * empty declaration. It is valid but weird. Emit a warning.
2608 * - The program text contained something like 'S;' and 'S' is not the
2609 * name of a known structure type. This is both invalid and weird.
2612 * Note that if decl_type is NULL and there is a structure involved,
2613 * there must have been some sort of error with the structure. In this
2614 * case we assume that an error was already generated on this line of
2615 * code for the structure. There is no need to generate an additional,
2618 assert(this->type
->specifier
->structure
== NULL
|| decl_type
!= NULL
2620 if (this->type
->specifier
->structure
== NULL
) {
2621 if (decl_type
!= NULL
) {
2622 _mesa_glsl_warning(&loc
, state
, "empty declaration");
2624 _mesa_glsl_error(&loc
, state
,
2625 "invalid type `%s' in empty declaration",
2630 if (this->type
->qualifier
.precision
!= ast_precision_none
&&
2631 this->type
->specifier
->structure
!= NULL
) {
2632 _mesa_glsl_error(&loc
, state
, "precision qualifiers can't be applied "
2637 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
2638 const struct glsl_type
*var_type
;
2641 /* FINISHME: Emit a warning if a variable declaration shadows a
2642 * FINISHME: declaration at a higher scope.
2645 if ((decl_type
== NULL
) || decl_type
->is_void()) {
2646 if (type_name
!= NULL
) {
2647 _mesa_glsl_error(& loc
, state
,
2648 "invalid type `%s' in declaration of `%s'",
2649 type_name
, decl
->identifier
);
2651 _mesa_glsl_error(& loc
, state
,
2652 "invalid type in declaration of `%s'",
2658 if (decl
->is_array
) {
2659 var_type
= process_array_type(&loc
, decl_type
, decl
->array_size
,
2661 if (var_type
->is_error())
2664 var_type
= decl_type
;
2667 var
= new(ctx
) ir_variable(var_type
, decl
->identifier
, ir_var_auto
);
2669 /* The 'varying in' and 'varying out' qualifiers can only be used with
2670 * ARB_geometry_shader4 and EXT_geometry_shader4, which we don't support
2673 if (this->type
->qualifier
.flags
.q
.varying
) {
2674 if (this->type
->qualifier
.flags
.q
.in
) {
2675 _mesa_glsl_error(& loc
, state
,
2676 "`varying in' qualifier in declaration of "
2677 "`%s' only valid for geometry shaders using "
2678 "ARB_geometry_shader4 or EXT_geometry_shader4",
2680 } else if (this->type
->qualifier
.flags
.q
.out
) {
2681 _mesa_glsl_error(& loc
, state
,
2682 "`varying out' qualifier in declaration of "
2683 "`%s' only valid for geometry shaders using "
2684 "ARB_geometry_shader4 or EXT_geometry_shader4",
2689 /* From page 22 (page 28 of the PDF) of the GLSL 1.10 specification;
2691 * "Global variables can only use the qualifiers const,
2692 * attribute, uni form, or varying. Only one may be
2695 * Local variables can only use the qualifier const."
2697 * This is relaxed in GLSL 1.30 and GLSL ES 3.00. It is also relaxed by
2698 * any extension that adds the 'layout' keyword.
2700 if (!state
->is_version(130, 300)
2701 && !state
->ARB_explicit_attrib_location_enable
2702 && !state
->ARB_fragment_coord_conventions_enable
) {
2703 if (this->type
->qualifier
.flags
.q
.out
) {
2704 _mesa_glsl_error(& loc
, state
,
2705 "`out' qualifier in declaration of `%s' "
2706 "only valid for function parameters in %s",
2707 decl
->identifier
, state
->get_version_string());
2709 if (this->type
->qualifier
.flags
.q
.in
) {
2710 _mesa_glsl_error(& loc
, state
,
2711 "`in' qualifier in declaration of `%s' "
2712 "only valid for function parameters in %s",
2713 decl
->identifier
, state
->get_version_string());
2715 /* FINISHME: Test for other invalid qualifiers. */
2718 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
,
2719 & loc
, this->ubo_qualifiers_valid
, false);
2721 if (this->type
->qualifier
.flags
.q
.invariant
) {
2722 if ((state
->target
== vertex_shader
) &&
2723 var
->mode
!= ir_var_shader_out
) {
2724 _mesa_glsl_error(& loc
, state
,
2725 "`%s' cannot be marked invariant, vertex shader "
2726 "outputs only", var
->name
);
2727 } else if ((state
->target
== fragment_shader
) &&
2728 var
->mode
!= ir_var_shader_in
) {
2729 /* FINISHME: Note that this doesn't work for invariant on
2730 * a function signature inval
2732 _mesa_glsl_error(& loc
, state
,
2733 "`%s' cannot be marked invariant, fragment shader "
2734 "inputs only", var
->name
);
2738 if (state
->current_function
!= NULL
) {
2739 const char *mode
= NULL
;
2740 const char *extra
= "";
2742 /* There is no need to check for 'inout' here because the parser will
2743 * only allow that in function parameter lists.
2745 if (this->type
->qualifier
.flags
.q
.attribute
) {
2747 } else if (this->type
->qualifier
.flags
.q
.uniform
) {
2749 } else if (this->type
->qualifier
.flags
.q
.varying
) {
2751 } else if (this->type
->qualifier
.flags
.q
.in
) {
2753 extra
= " or in function parameter list";
2754 } else if (this->type
->qualifier
.flags
.q
.out
) {
2756 extra
= " or in function parameter list";
2760 _mesa_glsl_error(& loc
, state
,
2761 "%s variable `%s' must be declared at "
2763 mode
, var
->name
, extra
);
2765 } else if (var
->mode
== ir_var_shader_in
) {
2766 var
->read_only
= true;
2768 if (state
->target
== vertex_shader
) {
2769 bool error_emitted
= false;
2771 /* From page 31 (page 37 of the PDF) of the GLSL 1.50 spec:
2773 * "Vertex shader inputs can only be float, floating-point
2774 * vectors, matrices, signed and unsigned integers and integer
2775 * vectors. Vertex shader inputs can also form arrays of these
2776 * types, but not structures."
2778 * From page 31 (page 27 of the PDF) of the GLSL 1.30 spec:
2780 * "Vertex shader inputs can only be float, floating-point
2781 * vectors, matrices, signed and unsigned integers and integer
2782 * vectors. They cannot be arrays or structures."
2784 * From page 23 (page 29 of the PDF) of the GLSL 1.20 spec:
2786 * "The attribute qualifier can be used only with float,
2787 * floating-point vectors, and matrices. Attribute variables
2788 * cannot be declared as arrays or structures."
2790 * From page 33 (page 39 of the PDF) of the GLSL ES 3.00 spec:
2792 * "Vertex shader inputs can only be float, floating-point
2793 * vectors, matrices, signed and unsigned integers and integer
2794 * vectors. Vertex shader inputs cannot be arrays or
2797 const glsl_type
*check_type
= var
->type
->is_array()
2798 ? var
->type
->fields
.array
: var
->type
;
2800 switch (check_type
->base_type
) {
2801 case GLSL_TYPE_FLOAT
:
2803 case GLSL_TYPE_UINT
:
2805 if (state
->is_version(120, 300))
2809 _mesa_glsl_error(& loc
, state
,
2810 "vertex shader input / attribute cannot have "
2812 var
->type
->is_array() ? "array of " : "",
2814 error_emitted
= true;
2817 if (!error_emitted
&& var
->type
->is_array() &&
2818 !state
->check_version(150, 0, &loc
,
2819 "vertex shader input / attribute "
2820 "cannot have array type")) {
2821 error_emitted
= true;
2823 } else if (state
->target
== geometry_shader
) {
2824 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
2826 * Geometry shader input variables get the per-vertex values
2827 * written out by vertex shader output variables of the same
2828 * names. Since a geometry shader operates on a set of
2829 * vertices, each input varying variable (or input block, see
2830 * interface blocks below) needs to be declared as an array.
2832 if (!var
->type
->is_array()) {
2833 _mesa_glsl_error(&loc
, state
,
2834 "geometry shader inputs must be arrays");
2839 /* Integer fragment inputs must be qualified with 'flat'. In GLSL ES,
2840 * so must integer vertex outputs.
2842 * From section 4.3.4 ("Inputs") of the GLSL 1.50 spec:
2843 * "Fragment shader inputs that are signed or unsigned integers or
2844 * integer vectors must be qualified with the interpolation qualifier
2847 * From section 4.3.4 ("Input Variables") of the GLSL 3.00 ES spec:
2848 * "Fragment shader inputs that are, or contain, signed or unsigned
2849 * integers or integer vectors must be qualified with the
2850 * interpolation qualifier flat."
2852 * From section 4.3.6 ("Output Variables") of the GLSL 3.00 ES spec:
2853 * "Vertex shader outputs that are, or contain, signed or unsigned
2854 * integers or integer vectors must be qualified with the
2855 * interpolation qualifier flat."
2857 * Note that prior to GLSL 1.50, this requirement applied to vertex
2858 * outputs rather than fragment inputs. That creates problems in the
2859 * presence of geometry shaders, so we adopt the GLSL 1.50 rule for all
2860 * desktop GL shaders. For GLSL ES shaders, we follow the spec and
2861 * apply the restriction to both vertex outputs and fragment inputs.
2863 * Note also that the desktop GLSL specs are missing the text "or
2864 * contain"; this is presumably an oversight, since there is no
2865 * reasonable way to interpolate a fragment shader input that contains
2868 if (state
->is_version(130, 300) &&
2869 var
->type
->contains_integer() &&
2870 var
->interpolation
!= INTERP_QUALIFIER_FLAT
&&
2871 ((state
->target
== fragment_shader
&& var
->mode
== ir_var_shader_in
)
2872 || (state
->target
== vertex_shader
&& var
->mode
== ir_var_shader_out
2873 && state
->es_shader
))) {
2874 const char *var_type
= (state
->target
== vertex_shader
) ?
2875 "vertex output" : "fragment input";
2876 _mesa_glsl_error(&loc
, state
, "if a %s is (or contains) "
2877 "an integer, then it must be qualified with 'flat'",
2882 /* Interpolation qualifiers cannot be applied to 'centroid' and
2883 * 'centroid varying'.
2885 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
2886 * "interpolation qualifiers may only precede the qualifiers in,
2887 * centroid in, out, or centroid out in a declaration. They do not apply
2888 * to the deprecated storage qualifiers varying or centroid varying."
2890 * These deprecated storage qualifiers do not exist in GLSL ES 3.00.
2892 if (state
->is_version(130, 0)
2893 && this->type
->qualifier
.has_interpolation()
2894 && this->type
->qualifier
.flags
.q
.varying
) {
2896 const char *i
= this->type
->qualifier
.interpolation_string();
2899 if (this->type
->qualifier
.flags
.q
.centroid
)
2900 s
= "centroid varying";
2904 _mesa_glsl_error(&loc
, state
,
2905 "qualifier '%s' cannot be applied to the "
2906 "deprecated storage qualifier '%s'", i
, s
);
2910 /* Interpolation qualifiers can only apply to vertex shader outputs and
2911 * fragment shader inputs.
2913 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
2914 * "Outputs from a vertex shader (out) and inputs to a fragment
2915 * shader (in) can be further qualified with one or more of these
2916 * interpolation qualifiers"
2918 * From page 31 (page 37 of the PDF) of the GLSL ES 3.00 spec:
2919 * "These interpolation qualifiers may only precede the qualifiers
2920 * in, centroid in, out, or centroid out in a declaration. They do
2921 * not apply to inputs into a vertex shader or outputs from a
2924 if (state
->is_version(130, 300)
2925 && this->type
->qualifier
.has_interpolation()) {
2927 const char *i
= this->type
->qualifier
.interpolation_string();
2930 switch (state
->target
) {
2932 if (this->type
->qualifier
.flags
.q
.in
) {
2933 _mesa_glsl_error(&loc
, state
,
2934 "qualifier '%s' cannot be applied to vertex "
2935 "shader inputs", i
);
2938 case fragment_shader
:
2939 if (this->type
->qualifier
.flags
.q
.out
) {
2940 _mesa_glsl_error(&loc
, state
,
2941 "qualifier '%s' cannot be applied to fragment "
2942 "shader outputs", i
);
2951 /* From section 4.3.4 of the GLSL 1.30 spec:
2952 * "It is an error to use centroid in in a vertex shader."
2954 * From section 4.3.4 of the GLSL ES 3.00 spec:
2955 * "It is an error to use centroid in or interpolation qualifiers in
2956 * a vertex shader input."
2958 if (state
->is_version(130, 300)
2959 && this->type
->qualifier
.flags
.q
.centroid
2960 && this->type
->qualifier
.flags
.q
.in
2961 && state
->target
== vertex_shader
) {
2963 _mesa_glsl_error(&loc
, state
,
2964 "'centroid in' cannot be used in a vertex shader");
2967 /* Section 4.3.6 of the GLSL 1.30 specification states:
2968 * "It is an error to use centroid out in a fragment shader."
2970 * The GL_ARB_shading_language_420pack extension specification states:
2971 * "It is an error to use auxiliary storage qualifiers or interpolation
2972 * qualifiers on an output in a fragment shader."
2974 if (state
->target
== fragment_shader
&&
2975 this->type
->qualifier
.flags
.q
.out
&&
2976 this->type
->qualifier
.has_auxiliary_storage()) {
2977 _mesa_glsl_error(&loc
, state
,
2978 "auxiliary storage qualifiers cannot be used on "
2979 "fragment shader outputs");
2982 /* Precision qualifiers exists only in GLSL versions 1.00 and >= 1.30.
2984 if (this->type
->qualifier
.precision
!= ast_precision_none
) {
2985 state
->check_precision_qualifiers_allowed(&loc
);
2989 /* Precision qualifiers only apply to floating point and integer types.
2991 * From section 4.5.2 of the GLSL 1.30 spec:
2992 * "Any floating point or any integer declaration can have the type
2993 * preceded by one of these precision qualifiers [...] Literal
2994 * constants do not have precision qualifiers. Neither do Boolean
2997 * In GLSL ES, sampler types are also allowed.
2999 * From page 87 of the GLSL ES spec:
3000 * "RESOLUTION: Allow sampler types to take a precision qualifier."
3002 if (this->type
->qualifier
.precision
!= ast_precision_none
3003 && !var
->type
->is_float()
3004 && !var
->type
->is_integer()
3005 && !var
->type
->is_record()
3006 && !(var
->type
->is_sampler() && state
->es_shader
)
3007 && !(var
->type
->is_array()
3008 && (var
->type
->fields
.array
->is_float()
3009 || var
->type
->fields
.array
->is_integer()))) {
3011 _mesa_glsl_error(&loc
, state
,
3012 "precision qualifiers apply only to floating point"
3013 "%s types", state
->es_shader
? ", integer, and sampler"
3017 /* From page 17 (page 23 of the PDF) of the GLSL 1.20 spec:
3019 * "[Sampler types] can only be declared as function
3020 * parameters or uniform variables (see Section 4.3.5
3023 if (var_type
->contains_sampler() &&
3024 !this->type
->qualifier
.flags
.q
.uniform
) {
3025 _mesa_glsl_error(&loc
, state
, "samplers must be declared uniform");
3028 /* Process the initializer and add its instructions to a temporary
3029 * list. This list will be added to the instruction stream (below) after
3030 * the declaration is added. This is done because in some cases (such as
3031 * redeclarations) the declaration may not actually be added to the
3032 * instruction stream.
3034 exec_list initializer_instructions
;
3035 ir_variable
*earlier
= get_variable_being_redeclared(var
, decl
, state
);
3037 if (decl
->initializer
!= NULL
) {
3038 result
= process_initializer((earlier
== NULL
) ? var
: earlier
,
3040 &initializer_instructions
, state
);
3043 /* From page 23 (page 29 of the PDF) of the GLSL 1.10 spec:
3045 * "It is an error to write to a const variable outside of
3046 * its declaration, so they must be initialized when
3049 if (this->type
->qualifier
.flags
.q
.constant
&& decl
->initializer
== NULL
) {
3050 _mesa_glsl_error(& loc
, state
,
3051 "const declaration of `%s' must be initialized",
3055 /* If the declaration is not a redeclaration, there are a few additional
3056 * semantic checks that must be applied. In addition, variable that was
3057 * created for the declaration should be added to the IR stream.
3059 if (earlier
== NULL
) {
3060 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
3062 * "Identifiers starting with "gl_" are reserved for use by
3063 * OpenGL, and may not be declared in a shader as either a
3064 * variable or a function."
3066 if (strncmp(decl
->identifier
, "gl_", 3) == 0)
3067 _mesa_glsl_error(& loc
, state
,
3068 "identifier `%s' uses reserved `gl_' prefix",
3070 else if (strstr(decl
->identifier
, "__")) {
3071 /* From page 14 (page 20 of the PDF) of the GLSL 1.10
3074 * "In addition, all identifiers containing two
3075 * consecutive underscores (__) are reserved as
3076 * possible future keywords."
3078 _mesa_glsl_error(& loc
, state
,
3079 "identifier `%s' uses reserved `__' string",
3083 /* Add the variable to the symbol table. Note that the initializer's
3084 * IR was already processed earlier (though it hasn't been emitted
3085 * yet), without the variable in scope.
3087 * This differs from most C-like languages, but it follows the GLSL
3088 * specification. From page 28 (page 34 of the PDF) of the GLSL 1.50
3091 * "Within a declaration, the scope of a name starts immediately
3092 * after the initializer if present or immediately after the name
3093 * being declared if not."
3095 if (!state
->symbols
->add_variable(var
)) {
3096 YYLTYPE loc
= this->get_location();
3097 _mesa_glsl_error(&loc
, state
, "name `%s' already taken in the "
3098 "current scope", decl
->identifier
);
3102 /* Push the variable declaration to the top. It means that all the
3103 * variable declarations will appear in a funny last-to-first order,
3104 * but otherwise we run into trouble if a function is prototyped, a
3105 * global var is decled, then the function is defined with usage of
3106 * the global var. See glslparsertest's CorrectModule.frag.
3108 instructions
->push_head(var
);
3111 instructions
->append_list(&initializer_instructions
);
3115 /* Generally, variable declarations do not have r-values. However,
3116 * one is used for the declaration in
3118 * while (bool b = some_condition()) {
3122 * so we return the rvalue from the last seen declaration here.
3129 ast_parameter_declarator::hir(exec_list
*instructions
,
3130 struct _mesa_glsl_parse_state
*state
)
3133 const struct glsl_type
*type
;
3134 const char *name
= NULL
;
3135 YYLTYPE loc
= this->get_location();
3137 type
= this->type
->specifier
->glsl_type(& name
, state
);
3141 _mesa_glsl_error(& loc
, state
,
3142 "invalid type `%s' in declaration of `%s'",
3143 name
, this->identifier
);
3145 _mesa_glsl_error(& loc
, state
,
3146 "invalid type in declaration of `%s'",
3150 type
= glsl_type::error_type
;
3153 /* From page 62 (page 68 of the PDF) of the GLSL 1.50 spec:
3155 * "Functions that accept no input arguments need not use void in the
3156 * argument list because prototypes (or definitions) are required and
3157 * therefore there is no ambiguity when an empty argument list "( )" is
3158 * declared. The idiom "(void)" as a parameter list is provided for
3161 * Placing this check here prevents a void parameter being set up
3162 * for a function, which avoids tripping up checks for main taking
3163 * parameters and lookups of an unnamed symbol.
3165 if (type
->is_void()) {
3166 if (this->identifier
!= NULL
)
3167 _mesa_glsl_error(& loc
, state
,
3168 "named parameter cannot have type `void'");
3174 if (formal_parameter
&& (this->identifier
== NULL
)) {
3175 _mesa_glsl_error(& loc
, state
, "formal parameter lacks a name");
3179 /* This only handles "vec4 foo[..]". The earlier specifier->glsl_type(...)
3180 * call already handled the "vec4[..] foo" case.
3182 if (this->is_array
) {
3183 type
= process_array_type(&loc
, type
, this->array_size
, state
);
3186 if (!type
->is_error() && type
->array_size() == 0) {
3187 _mesa_glsl_error(&loc
, state
, "arrays passed as parameters must have "
3189 type
= glsl_type::error_type
;
3193 ir_variable
*var
= new(ctx
)
3194 ir_variable(type
, this->identifier
, ir_var_function_in
);
3196 /* Apply any specified qualifiers to the parameter declaration. Note that
3197 * for function parameters the default mode is 'in'.
3199 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
, & loc
,
3202 /* From page 17 (page 23 of the PDF) of the GLSL 1.20 spec:
3204 * "Samplers cannot be treated as l-values; hence cannot be used
3205 * as out or inout function parameters, nor can they be assigned
3208 if ((var
->mode
== ir_var_function_inout
|| var
->mode
== ir_var_function_out
)
3209 && type
->contains_sampler()) {
3210 _mesa_glsl_error(&loc
, state
, "out and inout parameters cannot contain samplers");
3211 type
= glsl_type::error_type
;
3214 /* From page 39 (page 45 of the PDF) of the GLSL 1.10 spec:
3216 * "When calling a function, expressions that do not evaluate to
3217 * l-values cannot be passed to parameters declared as out or inout."
3219 * From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
3221 * "Other binary or unary expressions, non-dereferenced arrays,
3222 * function names, swizzles with repeated fields, and constants
3223 * cannot be l-values."
3225 * So for GLSL 1.10, passing an array as an out or inout parameter is not
3226 * allowed. This restriction is removed in GLSL 1.20, and in GLSL ES.
3228 if ((var
->mode
== ir_var_function_inout
|| var
->mode
== ir_var_function_out
)
3230 && !state
->check_version(120, 100, &loc
,
3231 "arrays cannot be out or inout parameters")) {
3232 type
= glsl_type::error_type
;
3235 instructions
->push_tail(var
);
3237 /* Parameter declarations do not have r-values.
3244 ast_parameter_declarator::parameters_to_hir(exec_list
*ast_parameters
,
3246 exec_list
*ir_parameters
,
3247 _mesa_glsl_parse_state
*state
)
3249 ast_parameter_declarator
*void_param
= NULL
;
3252 foreach_list_typed (ast_parameter_declarator
, param
, link
, ast_parameters
) {
3253 param
->formal_parameter
= formal
;
3254 param
->hir(ir_parameters
, state
);
3262 if ((void_param
!= NULL
) && (count
> 1)) {
3263 YYLTYPE loc
= void_param
->get_location();
3265 _mesa_glsl_error(& loc
, state
,
3266 "`void' parameter must be only parameter");
3272 emit_function(_mesa_glsl_parse_state
*state
, ir_function
*f
)
3274 /* IR invariants disallow function declarations or definitions
3275 * nested within other function definitions. But there is no
3276 * requirement about the relative order of function declarations
3277 * and definitions with respect to one another. So simply insert
3278 * the new ir_function block at the end of the toplevel instruction
3281 state
->toplevel_ir
->push_tail(f
);
3286 ast_function::hir(exec_list
*instructions
,
3287 struct _mesa_glsl_parse_state
*state
)
3290 ir_function
*f
= NULL
;
3291 ir_function_signature
*sig
= NULL
;
3292 exec_list hir_parameters
;
3294 const char *const name
= identifier
;
3296 /* New functions are always added to the top-level IR instruction stream,
3297 * so this instruction list pointer is ignored. See also emit_function
3300 (void) instructions
;
3302 /* From page 21 (page 27 of the PDF) of the GLSL 1.20 spec,
3304 * "Function declarations (prototypes) cannot occur inside of functions;
3305 * they must be at global scope, or for the built-in functions, outside
3306 * the global scope."
3308 * From page 27 (page 33 of the PDF) of the GLSL ES 1.00.16 spec,
3310 * "User defined functions may only be defined within the global scope."
3312 * Note that this language does not appear in GLSL 1.10.
3314 if ((state
->current_function
!= NULL
) &&
3315 state
->is_version(120, 100)) {
3316 YYLTYPE loc
= this->get_location();
3317 _mesa_glsl_error(&loc
, state
,
3318 "declaration of function `%s' not allowed within "
3319 "function body", name
);
3322 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
3324 * "Identifiers starting with "gl_" are reserved for use by
3325 * OpenGL, and may not be declared in a shader as either a
3326 * variable or a function."
3328 if (strncmp(name
, "gl_", 3) == 0) {
3329 YYLTYPE loc
= this->get_location();
3330 _mesa_glsl_error(&loc
, state
,
3331 "identifier `%s' uses reserved `gl_' prefix", name
);
3334 /* Convert the list of function parameters to HIR now so that they can be
3335 * used below to compare this function's signature with previously seen
3336 * signatures for functions with the same name.
3338 ast_parameter_declarator::parameters_to_hir(& this->parameters
,
3340 & hir_parameters
, state
);
3342 const char *return_type_name
;
3343 const glsl_type
*return_type
=
3344 this->return_type
->specifier
->glsl_type(& return_type_name
, state
);
3347 YYLTYPE loc
= this->get_location();
3348 _mesa_glsl_error(&loc
, state
,
3349 "function `%s' has undeclared return type `%s'",
3350 name
, return_type_name
);
3351 return_type
= glsl_type::error_type
;
3354 /* From page 56 (page 62 of the PDF) of the GLSL 1.30 spec:
3355 * "No qualifier is allowed on the return type of a function."
3357 if (this->return_type
->has_qualifiers()) {
3358 YYLTYPE loc
= this->get_location();
3359 _mesa_glsl_error(& loc
, state
,
3360 "function `%s' return type has qualifiers", name
);
3363 /* From page 17 (page 23 of the PDF) of the GLSL 1.20 spec:
3365 * "[Sampler types] can only be declared as function parameters
3366 * or uniform variables (see Section 4.3.5 "Uniform")".
3368 if (return_type
->contains_sampler()) {
3369 YYLTYPE loc
= this->get_location();
3370 _mesa_glsl_error(&loc
, state
,
3371 "function `%s' return type can't contain a sampler",
3375 /* Verify that this function's signature either doesn't match a previously
3376 * seen signature for a function with the same name, or, if a match is found,
3377 * that the previously seen signature does not have an associated definition.
3379 f
= state
->symbols
->get_function(name
);
3380 if (f
!= NULL
&& (state
->es_shader
|| f
->has_user_signature())) {
3381 sig
= f
->exact_matching_signature(&hir_parameters
);
3383 const char *badvar
= sig
->qualifiers_match(&hir_parameters
);
3384 if (badvar
!= NULL
) {
3385 YYLTYPE loc
= this->get_location();
3387 _mesa_glsl_error(&loc
, state
, "function `%s' parameter `%s' "
3388 "qualifiers don't match prototype", name
, badvar
);
3391 if (sig
->return_type
!= return_type
) {
3392 YYLTYPE loc
= this->get_location();
3394 _mesa_glsl_error(&loc
, state
, "function `%s' return type doesn't "
3395 "match prototype", name
);
3398 if (sig
->is_defined
) {
3399 if (is_definition
) {
3400 YYLTYPE loc
= this->get_location();
3401 _mesa_glsl_error(& loc
, state
, "function `%s' redefined", name
);
3403 /* We just encountered a prototype that exactly matches a
3404 * function that's already been defined. This is redundant,
3405 * and we should ignore it.
3412 f
= new(ctx
) ir_function(name
);
3413 if (!state
->symbols
->add_function(f
)) {
3414 /* This function name shadows a non-function use of the same name. */
3415 YYLTYPE loc
= this->get_location();
3417 _mesa_glsl_error(&loc
, state
, "function name `%s' conflicts with "
3418 "non-function", name
);
3422 emit_function(state
, f
);
3425 /* Verify the return type of main() */
3426 if (strcmp(name
, "main") == 0) {
3427 if (! return_type
->is_void()) {
3428 YYLTYPE loc
= this->get_location();
3430 _mesa_glsl_error(& loc
, state
, "main() must return void");
3433 if (!hir_parameters
.is_empty()) {
3434 YYLTYPE loc
= this->get_location();
3436 _mesa_glsl_error(& loc
, state
, "main() must not take any parameters");
3440 /* Finish storing the information about this new function in its signature.
3443 sig
= new(ctx
) ir_function_signature(return_type
);
3444 f
->add_signature(sig
);
3447 sig
->replace_parameters(&hir_parameters
);
3450 /* Function declarations (prototypes) do not have r-values.
3457 ast_function_definition::hir(exec_list
*instructions
,
3458 struct _mesa_glsl_parse_state
*state
)
3460 prototype
->is_definition
= true;
3461 prototype
->hir(instructions
, state
);
3463 ir_function_signature
*signature
= prototype
->signature
;
3464 if (signature
== NULL
)
3467 assert(state
->current_function
== NULL
);
3468 state
->current_function
= signature
;
3469 state
->found_return
= false;
3471 /* Duplicate parameters declared in the prototype as concrete variables.
3472 * Add these to the symbol table.
3474 state
->symbols
->push_scope();
3475 foreach_iter(exec_list_iterator
, iter
, signature
->parameters
) {
3476 ir_variable
*const var
= ((ir_instruction
*) iter
.get())->as_variable();
3478 assert(var
!= NULL
);
3480 /* The only way a parameter would "exist" is if two parameters have
3483 if (state
->symbols
->name_declared_this_scope(var
->name
)) {
3484 YYLTYPE loc
= this->get_location();
3486 _mesa_glsl_error(& loc
, state
, "parameter `%s' redeclared", var
->name
);
3488 state
->symbols
->add_variable(var
);
3492 /* Convert the body of the function to HIR. */
3493 this->body
->hir(&signature
->body
, state
);
3494 signature
->is_defined
= true;
3496 state
->symbols
->pop_scope();
3498 assert(state
->current_function
== signature
);
3499 state
->current_function
= NULL
;
3501 if (!signature
->return_type
->is_void() && !state
->found_return
) {
3502 YYLTYPE loc
= this->get_location();
3503 _mesa_glsl_error(& loc
, state
, "function `%s' has non-void return type "
3504 "%s, but no return statement",
3505 signature
->function_name(),
3506 signature
->return_type
->name
);
3509 /* Function definitions do not have r-values.
3516 ast_jump_statement::hir(exec_list
*instructions
,
3517 struct _mesa_glsl_parse_state
*state
)
3524 assert(state
->current_function
);
3526 if (opt_return_value
) {
3527 ir_rvalue
*ret
= opt_return_value
->hir(instructions
, state
);
3529 /* The value of the return type can be NULL if the shader says
3530 * 'return foo();' and foo() is a function that returns void.
3532 * NOTE: The GLSL spec doesn't say that this is an error. The type
3533 * of the return value is void. If the return type of the function is
3534 * also void, then this should compile without error. Seriously.
3536 const glsl_type
*const ret_type
=
3537 (ret
== NULL
) ? glsl_type::void_type
: ret
->type
;
3539 /* Implicit conversions are not allowed for return values prior to
3540 * ARB_shading_language_420pack.
3542 if (state
->current_function
->return_type
!= ret_type
) {
3543 YYLTYPE loc
= this->get_location();
3545 if (state
->ARB_shading_language_420pack_enable
) {
3546 if (!apply_implicit_conversion(state
->current_function
->return_type
,
3548 _mesa_glsl_error(& loc
, state
,
3549 "could not implicitly convert return value "
3550 "to %s, in function `%s'",
3551 state
->current_function
->return_type
->name
,
3552 state
->current_function
->function_name());
3555 _mesa_glsl_error(& loc
, state
,
3556 "`return' with wrong type %s, in function `%s' "
3559 state
->current_function
->function_name(),
3560 state
->current_function
->return_type
->name
);
3562 } else if (state
->current_function
->return_type
->base_type
==
3564 YYLTYPE loc
= this->get_location();
3566 /* The ARB_shading_language_420pack, GLSL ES 3.0, and GLSL 4.20
3567 * specs add a clarification:
3569 * "A void function can only use return without a return argument, even if
3570 * the return argument has void type. Return statements only accept values:
3573 * void func2() { return func1(); } // illegal return statement"
3575 _mesa_glsl_error(& loc
, state
,
3576 "void functions can only use `return' without a "
3580 inst
= new(ctx
) ir_return(ret
);
3582 if (state
->current_function
->return_type
->base_type
!=
3584 YYLTYPE loc
= this->get_location();
3586 _mesa_glsl_error(& loc
, state
,
3587 "`return' with no value, in function %s returning "
3589 state
->current_function
->function_name());
3591 inst
= new(ctx
) ir_return
;
3594 state
->found_return
= true;
3595 instructions
->push_tail(inst
);
3600 if (state
->target
!= fragment_shader
) {
3601 YYLTYPE loc
= this->get_location();
3603 _mesa_glsl_error(& loc
, state
,
3604 "`discard' may only appear in a fragment shader");
3606 instructions
->push_tail(new(ctx
) ir_discard
);
3611 if (mode
== ast_continue
&&
3612 state
->loop_nesting_ast
== NULL
) {
3613 YYLTYPE loc
= this->get_location();
3615 _mesa_glsl_error(& loc
, state
,
3616 "continue may only appear in a loop");
3617 } else if (mode
== ast_break
&&
3618 state
->loop_nesting_ast
== NULL
&&
3619 state
->switch_state
.switch_nesting_ast
== NULL
) {
3620 YYLTYPE loc
= this->get_location();
3622 _mesa_glsl_error(& loc
, state
,
3623 "break may only appear in a loop or a switch");
3625 /* For a loop, inline the for loop expression again,
3626 * since we don't know where near the end of
3627 * the loop body the normal copy of it
3628 * is going to be placed.
3630 if (state
->loop_nesting_ast
!= NULL
&&
3631 mode
== ast_continue
&&
3632 state
->loop_nesting_ast
->rest_expression
) {
3633 state
->loop_nesting_ast
->rest_expression
->hir(instructions
,
3637 if (state
->switch_state
.is_switch_innermost
&&
3638 mode
== ast_break
) {
3639 /* Force break out of switch by setting is_break switch state.
3641 ir_variable
*const is_break_var
= state
->switch_state
.is_break_var
;
3642 ir_dereference_variable
*const deref_is_break_var
=
3643 new(ctx
) ir_dereference_variable(is_break_var
);
3644 ir_constant
*const true_val
= new(ctx
) ir_constant(true);
3645 ir_assignment
*const set_break_var
=
3646 new(ctx
) ir_assignment(deref_is_break_var
, true_val
);
3648 instructions
->push_tail(set_break_var
);
3651 ir_loop_jump
*const jump
=
3652 new(ctx
) ir_loop_jump((mode
== ast_break
)
3653 ? ir_loop_jump::jump_break
3654 : ir_loop_jump::jump_continue
);
3655 instructions
->push_tail(jump
);
3662 /* Jump instructions do not have r-values.
3669 ast_selection_statement::hir(exec_list
*instructions
,
3670 struct _mesa_glsl_parse_state
*state
)
3674 ir_rvalue
*const condition
= this->condition
->hir(instructions
, state
);
3676 /* From page 66 (page 72 of the PDF) of the GLSL 1.50 spec:
3678 * "Any expression whose type evaluates to a Boolean can be used as the
3679 * conditional expression bool-expression. Vector types are not accepted
3680 * as the expression to if."
3682 * The checks are separated so that higher quality diagnostics can be
3683 * generated for cases where both rules are violated.
3685 if (!condition
->type
->is_boolean() || !condition
->type
->is_scalar()) {
3686 YYLTYPE loc
= this->condition
->get_location();
3688 _mesa_glsl_error(& loc
, state
, "if-statement condition must be scalar "
3692 ir_if
*const stmt
= new(ctx
) ir_if(condition
);
3694 if (then_statement
!= NULL
) {
3695 state
->symbols
->push_scope();
3696 then_statement
->hir(& stmt
->then_instructions
, state
);
3697 state
->symbols
->pop_scope();
3700 if (else_statement
!= NULL
) {
3701 state
->symbols
->push_scope();
3702 else_statement
->hir(& stmt
->else_instructions
, state
);
3703 state
->symbols
->pop_scope();
3706 instructions
->push_tail(stmt
);
3708 /* if-statements do not have r-values.
3715 ast_switch_statement::hir(exec_list
*instructions
,
3716 struct _mesa_glsl_parse_state
*state
)
3720 ir_rvalue
*const test_expression
=
3721 this->test_expression
->hir(instructions
, state
);
3723 /* From page 66 (page 55 of the PDF) of the GLSL 1.50 spec:
3725 * "The type of init-expression in a switch statement must be a
3728 if (!test_expression
->type
->is_scalar() ||
3729 !test_expression
->type
->is_integer()) {
3730 YYLTYPE loc
= this->test_expression
->get_location();
3732 _mesa_glsl_error(& loc
,
3734 "switch-statement expression must be scalar "
3738 /* Track the switch-statement nesting in a stack-like manner.
3740 struct glsl_switch_state saved
= state
->switch_state
;
3742 state
->switch_state
.is_switch_innermost
= true;
3743 state
->switch_state
.switch_nesting_ast
= this;
3744 state
->switch_state
.labels_ht
= hash_table_ctor(0, hash_table_pointer_hash
,
3745 hash_table_pointer_compare
);
3746 state
->switch_state
.previous_default
= NULL
;
3748 /* Initalize is_fallthru state to false.
3750 ir_rvalue
*const is_fallthru_val
= new (ctx
) ir_constant(false);
3751 state
->switch_state
.is_fallthru_var
=
3752 new(ctx
) ir_variable(glsl_type::bool_type
,
3753 "switch_is_fallthru_tmp",
3755 instructions
->push_tail(state
->switch_state
.is_fallthru_var
);
3757 ir_dereference_variable
*deref_is_fallthru_var
=
3758 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
3759 instructions
->push_tail(new(ctx
) ir_assignment(deref_is_fallthru_var
,
3762 /* Initalize is_break state to false.
3764 ir_rvalue
*const is_break_val
= new (ctx
) ir_constant(false);
3765 state
->switch_state
.is_break_var
= new(ctx
) ir_variable(glsl_type::bool_type
,
3766 "switch_is_break_tmp",
3768 instructions
->push_tail(state
->switch_state
.is_break_var
);
3770 ir_dereference_variable
*deref_is_break_var
=
3771 new(ctx
) ir_dereference_variable(state
->switch_state
.is_break_var
);
3772 instructions
->push_tail(new(ctx
) ir_assignment(deref_is_break_var
,
3775 /* Cache test expression.
3777 test_to_hir(instructions
, state
);
3779 /* Emit code for body of switch stmt.
3781 body
->hir(instructions
, state
);
3783 hash_table_dtor(state
->switch_state
.labels_ht
);
3785 state
->switch_state
= saved
;
3787 /* Switch statements do not have r-values. */
3793 ast_switch_statement::test_to_hir(exec_list
*instructions
,
3794 struct _mesa_glsl_parse_state
*state
)
3798 /* Cache value of test expression. */
3799 ir_rvalue
*const test_val
=
3800 test_expression
->hir(instructions
,
3803 state
->switch_state
.test_var
= new(ctx
) ir_variable(test_val
->type
,
3806 ir_dereference_variable
*deref_test_var
=
3807 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
3809 instructions
->push_tail(state
->switch_state
.test_var
);
3810 instructions
->push_tail(new(ctx
) ir_assignment(deref_test_var
, test_val
));
3815 ast_switch_body::hir(exec_list
*instructions
,
3816 struct _mesa_glsl_parse_state
*state
)
3819 stmts
->hir(instructions
, state
);
3821 /* Switch bodies do not have r-values. */
3826 ast_case_statement_list::hir(exec_list
*instructions
,
3827 struct _mesa_glsl_parse_state
*state
)
3829 foreach_list_typed (ast_case_statement
, case_stmt
, link
, & this->cases
)
3830 case_stmt
->hir(instructions
, state
);
3832 /* Case statements do not have r-values. */
3837 ast_case_statement::hir(exec_list
*instructions
,
3838 struct _mesa_glsl_parse_state
*state
)
3840 labels
->hir(instructions
, state
);
3842 /* Conditionally set fallthru state based on break state. */
3843 ir_constant
*const false_val
= new(state
) ir_constant(false);
3844 ir_dereference_variable
*const deref_is_fallthru_var
=
3845 new(state
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
3846 ir_dereference_variable
*const deref_is_break_var
=
3847 new(state
) ir_dereference_variable(state
->switch_state
.is_break_var
);
3848 ir_assignment
*const reset_fallthru_on_break
=
3849 new(state
) ir_assignment(deref_is_fallthru_var
,
3851 deref_is_break_var
);
3852 instructions
->push_tail(reset_fallthru_on_break
);
3854 /* Guard case statements depending on fallthru state. */
3855 ir_dereference_variable
*const deref_fallthru_guard
=
3856 new(state
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
3857 ir_if
*const test_fallthru
= new(state
) ir_if(deref_fallthru_guard
);
3859 foreach_list_typed (ast_node
, stmt
, link
, & this->stmts
)
3860 stmt
->hir(& test_fallthru
->then_instructions
, state
);
3862 instructions
->push_tail(test_fallthru
);
3864 /* Case statements do not have r-values. */
3870 ast_case_label_list::hir(exec_list
*instructions
,
3871 struct _mesa_glsl_parse_state
*state
)
3873 foreach_list_typed (ast_case_label
, label
, link
, & this->labels
)
3874 label
->hir(instructions
, state
);
3876 /* Case labels do not have r-values. */
3881 ast_case_label::hir(exec_list
*instructions
,
3882 struct _mesa_glsl_parse_state
*state
)
3886 ir_dereference_variable
*deref_fallthru_var
=
3887 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
3889 ir_rvalue
*const true_val
= new(ctx
) ir_constant(true);
3891 /* If not default case, ... */
3892 if (this->test_value
!= NULL
) {
3893 /* Conditionally set fallthru state based on
3894 * comparison of cached test expression value to case label.
3896 ir_rvalue
*const label_rval
= this->test_value
->hir(instructions
, state
);
3897 ir_constant
*label_const
= label_rval
->constant_expression_value();
3900 YYLTYPE loc
= this->test_value
->get_location();
3902 _mesa_glsl_error(& loc
, state
,
3903 "switch statement case label must be a "
3904 "constant expression");
3906 /* Stuff a dummy value in to allow processing to continue. */
3907 label_const
= new(ctx
) ir_constant(0);
3909 ast_expression
*previous_label
= (ast_expression
*)
3910 hash_table_find(state
->switch_state
.labels_ht
,
3911 (void *)(uintptr_t)label_const
->value
.u
[0]);
3913 if (previous_label
) {
3914 YYLTYPE loc
= this->test_value
->get_location();
3915 _mesa_glsl_error(& loc
, state
,
3916 "duplicate case value");
3918 loc
= previous_label
->get_location();
3919 _mesa_glsl_error(& loc
, state
,
3920 "this is the previous case label");
3922 hash_table_insert(state
->switch_state
.labels_ht
,
3924 (void *)(uintptr_t)label_const
->value
.u
[0]);
3928 ir_dereference_variable
*deref_test_var
=
3929 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
3931 ir_rvalue
*const test_cond
= new(ctx
) ir_expression(ir_binop_all_equal
,
3935 ir_assignment
*set_fallthru_on_test
=
3936 new(ctx
) ir_assignment(deref_fallthru_var
,
3940 instructions
->push_tail(set_fallthru_on_test
);
3941 } else { /* default case */
3942 if (state
->switch_state
.previous_default
) {
3943 YYLTYPE loc
= this->get_location();
3944 _mesa_glsl_error(& loc
, state
,
3945 "multiple default labels in one switch");
3947 loc
= state
->switch_state
.previous_default
->get_location();
3948 _mesa_glsl_error(& loc
, state
,
3949 "this is the first default label");
3951 state
->switch_state
.previous_default
= this;
3953 /* Set falltrhu state. */
3954 ir_assignment
*set_fallthru
=
3955 new(ctx
) ir_assignment(deref_fallthru_var
, true_val
);
3957 instructions
->push_tail(set_fallthru
);
3960 /* Case statements do not have r-values. */
3965 ast_iteration_statement::condition_to_hir(ir_loop
*stmt
,
3966 struct _mesa_glsl_parse_state
*state
)
3970 if (condition
!= NULL
) {
3971 ir_rvalue
*const cond
=
3972 condition
->hir(& stmt
->body_instructions
, state
);
3975 || !cond
->type
->is_boolean() || !cond
->type
->is_scalar()) {
3976 YYLTYPE loc
= condition
->get_location();
3978 _mesa_glsl_error(& loc
, state
,
3979 "loop condition must be scalar boolean");
3981 /* As the first code in the loop body, generate a block that looks
3982 * like 'if (!condition) break;' as the loop termination condition.
3984 ir_rvalue
*const not_cond
=
3985 new(ctx
) ir_expression(ir_unop_logic_not
, cond
);
3987 ir_if
*const if_stmt
= new(ctx
) ir_if(not_cond
);
3989 ir_jump
*const break_stmt
=
3990 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
3992 if_stmt
->then_instructions
.push_tail(break_stmt
);
3993 stmt
->body_instructions
.push_tail(if_stmt
);
4000 ast_iteration_statement::hir(exec_list
*instructions
,
4001 struct _mesa_glsl_parse_state
*state
)
4005 /* For-loops and while-loops start a new scope, but do-while loops do not.
4007 if (mode
!= ast_do_while
)
4008 state
->symbols
->push_scope();
4010 if (init_statement
!= NULL
)
4011 init_statement
->hir(instructions
, state
);
4013 ir_loop
*const stmt
= new(ctx
) ir_loop();
4014 instructions
->push_tail(stmt
);
4016 /* Track the current loop nesting. */
4017 ast_iteration_statement
*nesting_ast
= state
->loop_nesting_ast
;
4019 state
->loop_nesting_ast
= this;
4021 /* Likewise, indicate that following code is closest to a loop,
4022 * NOT closest to a switch.
4024 bool saved_is_switch_innermost
= state
->switch_state
.is_switch_innermost
;
4025 state
->switch_state
.is_switch_innermost
= false;
4027 if (mode
!= ast_do_while
)
4028 condition_to_hir(stmt
, state
);
4031 body
->hir(& stmt
->body_instructions
, state
);
4033 if (rest_expression
!= NULL
)
4034 rest_expression
->hir(& stmt
->body_instructions
, state
);
4036 if (mode
== ast_do_while
)
4037 condition_to_hir(stmt
, state
);
4039 if (mode
!= ast_do_while
)
4040 state
->symbols
->pop_scope();
4042 /* Restore previous nesting before returning. */
4043 state
->loop_nesting_ast
= nesting_ast
;
4044 state
->switch_state
.is_switch_innermost
= saved_is_switch_innermost
;
4046 /* Loops do not have r-values.
4053 * Determine if the given type is valid for establishing a default precision
4056 * From GLSL ES 3.00 section 4.5.4 ("Default Precision Qualifiers"):
4058 * "The precision statement
4060 * precision precision-qualifier type;
4062 * can be used to establish a default precision qualifier. The type field
4063 * can be either int or float or any of the sampler types, and the
4064 * precision-qualifier can be lowp, mediump, or highp."
4066 * GLSL ES 1.00 has similar language. GLSL 1.30 doesn't allow precision
4067 * qualifiers on sampler types, but this seems like an oversight (since the
4068 * intention of including these in GLSL 1.30 is to allow compatibility with ES
4069 * shaders). So we allow int, float, and all sampler types regardless of GLSL
4073 is_valid_default_precision_type(const struct _mesa_glsl_parse_state
*state
,
4074 const char *type_name
)
4076 const struct glsl_type
*type
= state
->symbols
->get_type(type_name
);
4080 switch (type
->base_type
) {
4082 case GLSL_TYPE_FLOAT
:
4083 /* "int" and "float" are valid, but vectors and matrices are not. */
4084 return type
->vector_elements
== 1 && type
->matrix_columns
== 1;
4085 case GLSL_TYPE_SAMPLER
:
4094 ast_type_specifier::hir(exec_list
*instructions
,
4095 struct _mesa_glsl_parse_state
*state
)
4097 if (this->default_precision
== ast_precision_none
&& this->structure
== NULL
)
4100 YYLTYPE loc
= this->get_location();
4102 /* If this is a precision statement, check that the type to which it is
4103 * applied is either float or int.
4105 * From section 4.5.3 of the GLSL 1.30 spec:
4106 * "The precision statement
4107 * precision precision-qualifier type;
4108 * can be used to establish a default precision qualifier. The type
4109 * field can be either int or float [...]. Any other types or
4110 * qualifiers will result in an error.
4112 if (this->default_precision
!= ast_precision_none
) {
4113 if (!state
->check_precision_qualifiers_allowed(&loc
))
4116 if (this->structure
!= NULL
) {
4117 _mesa_glsl_error(&loc
, state
,
4118 "precision qualifiers do not apply to structures");
4122 if (this->is_array
) {
4123 _mesa_glsl_error(&loc
, state
,
4124 "default precision statements do not apply to "
4128 if (!is_valid_default_precision_type(state
, this->type_name
)) {
4129 _mesa_glsl_error(&loc
, state
,
4130 "default precision statements apply only to types "
4131 "float, int, and sampler types");
4135 /* FINISHME: Translate precision statements into IR. */
4139 /* _mesa_ast_set_aggregate_type() sets the <structure> field so that
4140 * process_record_constructor() can do type-checking on C-style initializer
4141 * expressions of structs, but ast_struct_specifier should only be translated
4142 * to HIR if it is declaring the type of a structure.
4144 * The ->is_declaration field is false for initializers of variables
4145 * declared separately from the struct's type definition.
4147 * struct S { ... }; (is_declaration = true)
4148 * struct T { ... } t = { ... }; (is_declaration = true)
4149 * S s = { ... }; (is_declaration = false)
4151 if (this->structure
!= NULL
&& this->structure
->is_declaration
)
4152 return this->structure
->hir(instructions
, state
);
4159 * Process a structure or interface block tree into an array of structure fields
4161 * After parsing, where there are some syntax differnces, structures and
4162 * interface blocks are almost identical. They are similar enough that the
4163 * AST for each can be processed the same way into a set of
4164 * \c glsl_struct_field to describe the members.
4167 * The number of fields processed. A pointer to the array structure fields is
4168 * stored in \c *fields_ret.
4171 ast_process_structure_or_interface_block(exec_list
*instructions
,
4172 struct _mesa_glsl_parse_state
*state
,
4173 exec_list
*declarations
,
4175 glsl_struct_field
**fields_ret
,
4177 bool block_row_major
)
4179 unsigned decl_count
= 0;
4181 /* Make an initial pass over the list of fields to determine how
4182 * many there are. Each element in this list is an ast_declarator_list.
4183 * This means that we actually need to count the number of elements in the
4184 * 'declarations' list in each of the elements.
4186 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
4187 foreach_list_const (decl_ptr
, & decl_list
->declarations
) {
4192 /* Allocate storage for the fields and process the field
4193 * declarations. As the declarations are processed, try to also convert
4194 * the types to HIR. This ensures that structure definitions embedded in
4195 * other structure definitions or in interface blocks are processed.
4197 glsl_struct_field
*const fields
= ralloc_array(state
, glsl_struct_field
,
4201 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
4202 const char *type_name
;
4204 decl_list
->type
->specifier
->hir(instructions
, state
);
4206 /* Section 10.9 of the GLSL ES 1.00 specification states that
4207 * embedded structure definitions have been removed from the language.
4209 if (state
->es_shader
&& decl_list
->type
->specifier
->structure
!= NULL
) {
4210 _mesa_glsl_error(&loc
, state
, "embedded structure definitions are "
4211 "not allowed in GLSL ES 1.00");
4214 const glsl_type
*decl_type
=
4215 decl_list
->type
->specifier
->glsl_type(& type_name
, state
);
4217 foreach_list_typed (ast_declaration
, decl
, link
,
4218 &decl_list
->declarations
) {
4219 /* From the GL_ARB_uniform_buffer_object spec:
4221 * "Sampler types are not allowed inside of uniform
4222 * blocks. All other types, arrays, and structures
4223 * allowed for uniforms are allowed within a uniform
4226 * It should be impossible for decl_type to be NULL here. Cases that
4227 * might naturally lead to decl_type being NULL, especially for the
4228 * is_interface case, will have resulted in compilation having
4229 * already halted due to a syntax error.
4231 const struct glsl_type
*field_type
=
4232 decl_type
!= NULL
? decl_type
: glsl_type::error_type
;
4234 if (is_interface
&& field_type
->contains_sampler()) {
4235 YYLTYPE loc
= decl_list
->get_location();
4236 _mesa_glsl_error(&loc
, state
,
4237 "uniform in non-default uniform block contains sampler");
4240 const struct ast_type_qualifier
*const qual
=
4241 & decl_list
->type
->qualifier
;
4242 if (qual
->flags
.q
.std140
||
4243 qual
->flags
.q
.packed
||
4244 qual
->flags
.q
.shared
) {
4245 _mesa_glsl_error(&loc
, state
,
4246 "uniform block layout qualifiers std140, packed, and "
4247 "shared can only be applied to uniform blocks, not "
4251 if (decl
->is_array
) {
4252 field_type
= process_array_type(&loc
, decl_type
, decl
->array_size
,
4255 fields
[i
].type
= field_type
;
4256 fields
[i
].name
= decl
->identifier
;
4258 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
4259 if (!qual
->flags
.q
.uniform
) {
4260 _mesa_glsl_error(&loc
, state
,
4261 "row_major and column_major can only be "
4262 "applied to uniform interface blocks");
4263 } else if (!field_type
->is_matrix() && !field_type
->is_record()) {
4264 _mesa_glsl_error(&loc
, state
,
4265 "uniform block layout qualifiers row_major and "
4266 "column_major can only be applied to matrix and "
4269 validate_matrix_layout_for_type(state
, &loc
, field_type
);
4272 if (qual
->flags
.q
.uniform
&& qual
->has_interpolation()) {
4273 _mesa_glsl_error(&loc
, state
,
4274 "interpolation qualifiers cannot be used "
4275 "with uniform interface blocks");
4278 if (field_type
->is_matrix() ||
4279 (field_type
->is_array() && field_type
->fields
.array
->is_matrix())) {
4280 fields
[i
].row_major
= block_row_major
;
4281 if (qual
->flags
.q
.row_major
)
4282 fields
[i
].row_major
= true;
4283 else if (qual
->flags
.q
.column_major
)
4284 fields
[i
].row_major
= false;
4291 assert(i
== decl_count
);
4293 *fields_ret
= fields
;
4299 ast_struct_specifier::hir(exec_list
*instructions
,
4300 struct _mesa_glsl_parse_state
*state
)
4302 YYLTYPE loc
= this->get_location();
4303 glsl_struct_field
*fields
;
4304 unsigned decl_count
=
4305 ast_process_structure_or_interface_block(instructions
,
4307 &this->declarations
,
4313 const glsl_type
*t
=
4314 glsl_type::get_record_instance(fields
, decl_count
, this->name
);
4316 if (!state
->symbols
->add_type(name
, t
)) {
4317 _mesa_glsl_error(& loc
, state
, "struct `%s' previously defined", name
);
4319 const glsl_type
**s
= reralloc(state
, state
->user_structures
,
4321 state
->num_user_structures
+ 1);
4323 s
[state
->num_user_structures
] = t
;
4324 state
->user_structures
= s
;
4325 state
->num_user_structures
++;
4329 /* Structure type definitions do not have r-values.
4335 ast_interface_block::hir(exec_list
*instructions
,
4336 struct _mesa_glsl_parse_state
*state
)
4338 YYLTYPE loc
= this->get_location();
4340 /* The ast_interface_block has a list of ast_declarator_lists. We
4341 * need to turn those into ir_variables with an association
4342 * with this uniform block.
4344 enum glsl_interface_packing packing
;
4345 if (this->layout
.flags
.q
.shared
) {
4346 packing
= GLSL_INTERFACE_PACKING_SHARED
;
4347 } else if (this->layout
.flags
.q
.packed
) {
4348 packing
= GLSL_INTERFACE_PACKING_PACKED
;
4350 /* The default layout is std140.
4352 packing
= GLSL_INTERFACE_PACKING_STD140
;
4355 bool block_row_major
= this->layout
.flags
.q
.row_major
;
4356 exec_list declared_variables
;
4357 glsl_struct_field
*fields
;
4358 unsigned int num_variables
=
4359 ast_process_structure_or_interface_block(&declared_variables
,
4361 &this->declarations
,
4367 ir_variable_mode var_mode
;
4368 const char *iface_type_name
;
4369 if (this->layout
.flags
.q
.in
) {
4370 var_mode
= ir_var_shader_in
;
4371 iface_type_name
= "in";
4372 } else if (this->layout
.flags
.q
.out
) {
4373 var_mode
= ir_var_shader_out
;
4374 iface_type_name
= "out";
4375 } else if (this->layout
.flags
.q
.uniform
) {
4376 var_mode
= ir_var_uniform
;
4377 iface_type_name
= "uniform";
4379 var_mode
= ir_var_auto
;
4380 iface_type_name
= "UNKNOWN";
4381 assert(!"interface block layout qualifier not found!");
4384 const glsl_type
*block_type
=
4385 glsl_type::get_interface_instance(fields
,
4390 if (!state
->symbols
->add_interface(block_type
->name
, block_type
, var_mode
)) {
4391 YYLTYPE loc
= this->get_location();
4392 _mesa_glsl_error(&loc
, state
, "interface block `%s' with type `%s' "
4393 "already taken in the current scope",
4394 this->block_name
, iface_type_name
);
4397 /* Since interface blocks cannot contain statements, it should be
4398 * impossible for the block to generate any instructions.
4400 assert(declared_variables
.is_empty());
4402 /* Page 39 (page 45 of the PDF) of section 4.3.7 in the GLSL ES 3.00 spec
4405 * "If an instance name (instance-name) is used, then it puts all the
4406 * members inside a scope within its own name space, accessed with the
4407 * field selector ( . ) operator (analogously to structures)."
4409 if (this->instance_name
) {
4412 if (this->is_array
) {
4413 /* Section 4.3.7 (Interface Blocks) of the GLSL 1.50 spec says:
4415 * For uniform blocks declared an array, each individual array
4416 * element corresponds to a separate buffer object backing one
4417 * instance of the block. As the array size indicates the number
4418 * of buffer objects needed, uniform block array declarations
4419 * must specify an array size.
4421 * And a few paragraphs later:
4423 * Geometry shader input blocks must be declared as arrays and
4424 * follow the array declaration and linking rules for all
4425 * geometry shader inputs. All other input and output block
4426 * arrays must specify an array size.
4428 * The upshot of this is that the only circumstance where an
4429 * interface array size *doesn't* need to be specified is on a
4430 * geometry shader input.
4432 if (this->array_size
== NULL
&&
4433 (state
->target
!= geometry_shader
|| !this->layout
.flags
.q
.in
)) {
4434 _mesa_glsl_error(&loc
, state
,
4435 "only geometry shader inputs may be unsized "
4436 "instance block arrays");
4440 const glsl_type
*block_array_type
=
4441 process_array_type(&loc
, block_type
, this->array_size
, state
);
4443 var
= new(state
) ir_variable(block_array_type
,
4444 this->instance_name
,
4447 var
= new(state
) ir_variable(block_type
,
4448 this->instance_name
,
4452 var
->interface_type
= block_type
;
4453 state
->symbols
->add_variable(var
);
4454 instructions
->push_tail(var
);
4456 /* In order to have an array size, the block must also be declared with
4459 assert(!this->is_array
);
4461 for (unsigned i
= 0; i
< num_variables
; i
++) {
4463 new(state
) ir_variable(fields
[i
].type
,
4464 ralloc_strdup(state
, fields
[i
].name
),
4466 var
->interface_type
= block_type
;
4468 /* Propagate the "binding" keyword into this UBO's fields;
4469 * the UBO declaration itself doesn't get an ir_variable unless it
4470 * has an instance name. This is ugly.
4472 var
->explicit_binding
= this->layout
.flags
.q
.explicit_binding
;
4473 var
->binding
= this->layout
.binding
;
4475 state
->symbols
->add_variable(var
);
4476 instructions
->push_tail(var
);
4485 ast_gs_input_layout::hir(exec_list
*instructions
,
4486 struct _mesa_glsl_parse_state
*state
)
4488 YYLTYPE loc
= this->get_location();
4490 /* If any geometry input layout declaration preceded this one, make sure it
4491 * was consistent with this one.
4493 if (state
->gs_input_prim_type_specified
&&
4494 state
->gs_input_prim_type
!= this->prim_type
) {
4495 _mesa_glsl_error(&loc
, state
,
4496 "geometry shader input layout does not match"
4497 " previous declaration");
4501 state
->gs_input_prim_type_specified
= true;
4502 state
->gs_input_prim_type
= this->prim_type
;
4509 detect_conflicting_assignments(struct _mesa_glsl_parse_state
*state
,
4510 exec_list
*instructions
)
4512 bool gl_FragColor_assigned
= false;
4513 bool gl_FragData_assigned
= false;
4514 bool user_defined_fs_output_assigned
= false;
4515 ir_variable
*user_defined_fs_output
= NULL
;
4517 /* It would be nice to have proper location information. */
4519 memset(&loc
, 0, sizeof(loc
));
4521 foreach_list(node
, instructions
) {
4522 ir_variable
*var
= ((ir_instruction
*)node
)->as_variable();
4524 if (!var
|| !var
->assigned
)
4527 if (strcmp(var
->name
, "gl_FragColor") == 0)
4528 gl_FragColor_assigned
= true;
4529 else if (strcmp(var
->name
, "gl_FragData") == 0)
4530 gl_FragData_assigned
= true;
4531 else if (strncmp(var
->name
, "gl_", 3) != 0) {
4532 if (state
->target
== fragment_shader
&&
4533 var
->mode
== ir_var_shader_out
) {
4534 user_defined_fs_output_assigned
= true;
4535 user_defined_fs_output
= var
;
4540 /* From the GLSL 1.30 spec:
4542 * "If a shader statically assigns a value to gl_FragColor, it
4543 * may not assign a value to any element of gl_FragData. If a
4544 * shader statically writes a value to any element of
4545 * gl_FragData, it may not assign a value to
4546 * gl_FragColor. That is, a shader may assign values to either
4547 * gl_FragColor or gl_FragData, but not both. Multiple shaders
4548 * linked together must also consistently write just one of
4549 * these variables. Similarly, if user declared output
4550 * variables are in use (statically assigned to), then the
4551 * built-in variables gl_FragColor and gl_FragData may not be
4552 * assigned to. These incorrect usages all generate compile
4555 if (gl_FragColor_assigned
&& gl_FragData_assigned
) {
4556 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
4557 "`gl_FragColor' and `gl_FragData'");
4558 } else if (gl_FragColor_assigned
&& user_defined_fs_output_assigned
) {
4559 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
4560 "`gl_FragColor' and `%s'",
4561 user_defined_fs_output
->name
);
4562 } else if (gl_FragData_assigned
&& user_defined_fs_output_assigned
) {
4563 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
4564 "`gl_FragData' and `%s'",
4565 user_defined_fs_output
->name
);