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());
1778 const glsl_type
*array_type
= glsl_type::get_array_instance(base
, length
);
1779 return array_type
!= NULL
? array_type
: glsl_type::error_type
;
1784 ast_type_specifier::glsl_type(const char **name
,
1785 struct _mesa_glsl_parse_state
*state
) const
1787 const struct glsl_type
*type
;
1789 type
= state
->symbols
->get_type(this->type_name
);
1790 *name
= this->type_name
;
1792 if (this->is_array
) {
1793 YYLTYPE loc
= this->get_location();
1794 type
= process_array_type(&loc
, type
, this->array_size
, state
);
1801 ast_fully_specified_type::glsl_type(const char **name
,
1802 struct _mesa_glsl_parse_state
*state
) const
1804 const struct glsl_type
*type
= this->specifier
->glsl_type(name
, state
);
1809 if (type
->base_type
== GLSL_TYPE_FLOAT
1811 && state
->target
== fragment_shader
1812 && this->qualifier
.precision
== ast_precision_none
1813 && state
->symbols
->get_variable("#default precision") == NULL
) {
1814 YYLTYPE loc
= this->get_location();
1815 _mesa_glsl_error(&loc
, state
,
1816 "no precision specified this scope for type `%s'",
1824 * Determine whether a toplevel variable declaration declares a varying. This
1825 * function operates by examining the variable's mode and the shader target,
1826 * so it correctly identifies linkage variables regardless of whether they are
1827 * declared using the deprecated "varying" syntax or the new "in/out" syntax.
1829 * Passing a non-toplevel variable declaration (e.g. a function parameter) to
1830 * this function will produce undefined results.
1833 is_varying_var(ir_variable
*var
, _mesa_glsl_parser_targets target
)
1837 return var
->mode
== ir_var_shader_out
;
1838 case fragment_shader
:
1839 return var
->mode
== ir_var_shader_in
;
1841 return var
->mode
== ir_var_shader_out
|| var
->mode
== ir_var_shader_in
;
1847 * Matrix layout qualifiers are only allowed on certain types
1850 validate_matrix_layout_for_type(struct _mesa_glsl_parse_state
*state
,
1852 const glsl_type
*type
,
1855 if (var
&& !var
->is_in_uniform_block()) {
1856 /* Layout qualifiers may only apply to interface blocks and fields in
1859 _mesa_glsl_error(loc
, state
,
1860 "uniform block layout qualifiers row_major and "
1861 "column_major may not be applied to variables "
1862 "outside of uniform blocks");
1863 } else if (!type
->is_matrix()) {
1864 /* The OpenGL ES 3.0 conformance tests did not originally allow
1865 * matrix layout qualifiers on non-matrices. However, the OpenGL
1866 * 4.4 and OpenGL ES 3.0 (revision TBD) specifications were
1867 * amended to specifically allow these layouts on all types. Emit
1868 * a warning so that people know their code may not be portable.
1870 _mesa_glsl_warning(loc
, state
,
1871 "uniform block layout qualifiers row_major and "
1872 "column_major applied to non-matrix types may "
1873 "be rejected by older compilers");
1874 } else if (type
->is_record()) {
1875 /* We allow 'layout(row_major)' on structure types because it's the only
1876 * way to get row-major layouts on matrices contained in structures.
1878 _mesa_glsl_warning(loc
, state
,
1879 "uniform block layout qualifiers row_major and "
1880 "column_major applied to structure types is not "
1881 "strictly conformant and may be rejected by other "
1887 validate_binding_qualifier(struct _mesa_glsl_parse_state
*state
,
1890 const ast_type_qualifier
*qual
)
1892 if (var
->mode
!= ir_var_uniform
) {
1893 _mesa_glsl_error(loc
, state
,
1894 "the \"binding\" qualifier only applies to uniforms");
1898 if (qual
->binding
< 0) {
1899 _mesa_glsl_error(loc
, state
, "binding values must be >= 0");
1903 const struct gl_context
*const ctx
= state
->ctx
;
1904 unsigned elements
= var
->type
->is_array() ? var
->type
->length
: 1;
1905 unsigned max_index
= qual
->binding
+ elements
- 1;
1907 if (var
->type
->is_interface()) {
1908 /* UBOs. From page 60 of the GLSL 4.20 specification:
1909 * "If the binding point for any uniform block instance is less than zero,
1910 * or greater than or equal to the implementation-dependent maximum
1911 * number of uniform buffer bindings, a compilation error will occur.
1912 * When the binding identifier is used with a uniform block instanced as
1913 * an array of size N, all elements of the array from binding through
1914 * binding + N – 1 must be within this range."
1916 * The implementation-dependent maximum is GL_MAX_UNIFORM_BUFFER_BINDINGS.
1918 if (max_index
>= ctx
->Const
.MaxUniformBufferBindings
) {
1919 _mesa_glsl_error(loc
, state
, "layout(binding = %d) for %d UBOs exceeds "
1920 "the maximum number of UBO binding points (%d)",
1921 qual
->binding
, elements
,
1922 ctx
->Const
.MaxUniformBufferBindings
);
1925 } else if (var
->type
->is_sampler() ||
1926 (var
->type
->is_array() && var
->type
->fields
.array
->is_sampler())) {
1927 /* Samplers. From page 63 of the GLSL 4.20 specification:
1928 * "If the binding is less than zero, or greater than or equal to the
1929 * implementation-dependent maximum supported number of units, a
1930 * compilation error will occur. When the binding identifier is used
1931 * with an array of size N, all elements of the array from binding
1932 * through binding + N - 1 must be within this range."
1935 switch (state
->target
) {
1937 limit
= ctx
->Const
.VertexProgram
.MaxTextureImageUnits
;
1939 case geometry_shader
:
1940 limit
= ctx
->Const
.GeometryProgram
.MaxTextureImageUnits
;
1942 case fragment_shader
:
1943 limit
= ctx
->Const
.FragmentProgram
.MaxTextureImageUnits
;
1947 if (max_index
>= limit
) {
1948 _mesa_glsl_error(loc
, state
, "layout(binding = %d) for %d samplers "
1949 "exceeds the maximum number of texture image units "
1950 "(%d)", qual
->binding
, elements
, limit
);
1955 _mesa_glsl_error(loc
, state
,
1956 "the \"binding\" qualifier only applies to uniform "
1957 "blocks, samplers, or arrays of samplers");
1965 apply_type_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
1967 struct _mesa_glsl_parse_state
*state
,
1971 STATIC_ASSERT(sizeof(qual
->flags
.q
) <= sizeof(qual
->flags
.i
));
1973 if (qual
->flags
.q
.invariant
) {
1975 _mesa_glsl_error(loc
, state
,
1976 "variable `%s' may not be redeclared "
1977 "`invariant' after being used",
1984 if (qual
->flags
.q
.constant
|| qual
->flags
.q
.attribute
1985 || qual
->flags
.q
.uniform
1986 || (qual
->flags
.q
.varying
&& (state
->target
== fragment_shader
)))
1989 if (qual
->flags
.q
.centroid
)
1992 if (qual
->flags
.q
.attribute
&& state
->target
!= vertex_shader
) {
1993 var
->type
= glsl_type::error_type
;
1994 _mesa_glsl_error(loc
, state
,
1995 "`attribute' variables may not be declared in the "
1997 _mesa_glsl_shader_target_name(state
->target
));
2000 /* Section 6.1.1 (Function Calling Conventions) of the GLSL 1.10 spec says:
2002 * "However, the const qualifier cannot be used with out or inout."
2004 * The same section of the GLSL 4.40 spec further clarifies this saying:
2006 * "The const qualifier cannot be used with out or inout, or a
2007 * compile-time error results."
2009 if (is_parameter
&& qual
->flags
.q
.constant
&& qual
->flags
.q
.out
) {
2010 _mesa_glsl_error(loc
, state
,
2011 "`const' may not be applied to `out' or `inout' "
2012 "function parameters");
2015 /* If there is no qualifier that changes the mode of the variable, leave
2016 * the setting alone.
2018 if (qual
->flags
.q
.in
&& qual
->flags
.q
.out
)
2019 var
->mode
= ir_var_function_inout
;
2020 else if (qual
->flags
.q
.in
)
2021 var
->mode
= is_parameter
? ir_var_function_in
: ir_var_shader_in
;
2022 else if (qual
->flags
.q
.attribute
2023 || (qual
->flags
.q
.varying
&& (state
->target
== fragment_shader
)))
2024 var
->mode
= ir_var_shader_in
;
2025 else if (qual
->flags
.q
.out
)
2026 var
->mode
= is_parameter
? ir_var_function_out
: ir_var_shader_out
;
2027 else if (qual
->flags
.q
.varying
&& (state
->target
== vertex_shader
))
2028 var
->mode
= ir_var_shader_out
;
2029 else if (qual
->flags
.q
.uniform
)
2030 var
->mode
= ir_var_uniform
;
2032 if (!is_parameter
&& is_varying_var(var
, state
->target
)) {
2033 /* This variable is being used to link data between shader stages (in
2034 * pre-glsl-1.30 parlance, it's a "varying"). Check that it has a type
2035 * that is allowed for such purposes.
2037 * From page 25 (page 31 of the PDF) of the GLSL 1.10 spec:
2039 * "The varying qualifier can be used only with the data types
2040 * float, vec2, vec3, vec4, mat2, mat3, and mat4, or arrays of
2043 * This was relaxed in GLSL version 1.30 and GLSL ES version 3.00. From
2044 * page 31 (page 37 of the PDF) of the GLSL 1.30 spec:
2046 * "Fragment inputs can only be signed and unsigned integers and
2047 * integer vectors, float, floating-point vectors, matrices, or
2048 * arrays of these. Structures cannot be input.
2050 * Similar text exists in the section on vertex shader outputs.
2052 * Similar text exists in the GLSL ES 3.00 spec, except that the GLSL ES
2053 * 3.00 spec allows structs as well. Varying structs are also allowed
2056 switch (var
->type
->get_scalar_type()->base_type
) {
2057 case GLSL_TYPE_FLOAT
:
2058 /* Ok in all GLSL versions */
2060 case GLSL_TYPE_UINT
:
2062 if (state
->is_version(130, 300))
2064 _mesa_glsl_error(loc
, state
,
2065 "varying variables must be of base type float in %s",
2066 state
->get_version_string());
2068 case GLSL_TYPE_STRUCT
:
2069 if (state
->is_version(150, 300))
2071 _mesa_glsl_error(loc
, state
,
2072 "varying variables may not be of type struct");
2075 _mesa_glsl_error(loc
, state
, "illegal type for a varying variable");
2080 if (state
->all_invariant
&& (state
->current_function
== NULL
)) {
2081 switch (state
->target
) {
2083 if (var
->mode
== ir_var_shader_out
)
2084 var
->invariant
= true;
2086 case geometry_shader
:
2087 if ((var
->mode
== ir_var_shader_in
)
2088 || (var
->mode
== ir_var_shader_out
))
2089 var
->invariant
= true;
2091 case fragment_shader
:
2092 if (var
->mode
== ir_var_shader_in
)
2093 var
->invariant
= true;
2098 if (qual
->flags
.q
.flat
)
2099 var
->interpolation
= INTERP_QUALIFIER_FLAT
;
2100 else if (qual
->flags
.q
.noperspective
)
2101 var
->interpolation
= INTERP_QUALIFIER_NOPERSPECTIVE
;
2102 else if (qual
->flags
.q
.smooth
)
2103 var
->interpolation
= INTERP_QUALIFIER_SMOOTH
;
2105 var
->interpolation
= INTERP_QUALIFIER_NONE
;
2107 if (var
->interpolation
!= INTERP_QUALIFIER_NONE
) {
2108 ir_variable_mode mode
= (ir_variable_mode
) var
->mode
;
2110 if (mode
!= ir_var_shader_in
&& mode
!= ir_var_shader_out
) {
2111 _mesa_glsl_error(loc
, state
,
2112 "interpolation qualifier `%s' can only be applied to "
2113 "shader inputs or outputs.",
2114 var
->interpolation_string());
2118 if ((state
->target
== vertex_shader
&& mode
== ir_var_shader_in
) ||
2119 (state
->target
== fragment_shader
&& mode
== ir_var_shader_out
)) {
2120 _mesa_glsl_error(loc
, state
,
2121 "interpolation qualifier `%s' cannot be applied to "
2122 "vertex shader inputs or fragment shader outputs",
2123 var
->interpolation_string());
2127 var
->pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
2128 var
->origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
2129 if ((qual
->flags
.q
.origin_upper_left
|| qual
->flags
.q
.pixel_center_integer
)
2130 && (strcmp(var
->name
, "gl_FragCoord") != 0)) {
2131 const char *const qual_string
= (qual
->flags
.q
.origin_upper_left
)
2132 ? "origin_upper_left" : "pixel_center_integer";
2134 _mesa_glsl_error(loc
, state
,
2135 "layout qualifier `%s' can only be applied to "
2136 "fragment shader input `gl_FragCoord'",
2140 if (qual
->flags
.q
.explicit_location
) {
2141 const bool global_scope
= (state
->current_function
== NULL
);
2143 const char *string
= "";
2145 /* In the vertex shader only shader inputs can be given explicit
2148 * In the fragment shader only shader outputs can be given explicit
2151 switch (state
->target
) {
2153 if (!global_scope
|| (var
->mode
!= ir_var_shader_in
)) {
2159 case geometry_shader
:
2160 _mesa_glsl_error(loc
, state
,
2161 "geometry shader variables cannot be given "
2162 "explicit locations");
2165 case fragment_shader
:
2166 if (!global_scope
|| (var
->mode
!= ir_var_shader_out
)) {
2174 _mesa_glsl_error(loc
, state
,
2175 "only %s shader %s variables can be given an "
2176 "explicit location",
2177 _mesa_glsl_shader_target_name(state
->target
),
2180 var
->explicit_location
= true;
2182 /* This bit of silliness is needed because invalid explicit locations
2183 * are supposed to be flagged during linking. Small negative values
2184 * biased by VERT_ATTRIB_GENERIC0 or FRAG_RESULT_DATA0 could alias
2185 * built-in values (e.g., -16+VERT_ATTRIB_GENERIC0 = VERT_ATTRIB_POS).
2186 * The linker needs to be able to differentiate these cases. This
2187 * ensures that negative values stay negative.
2189 if (qual
->location
>= 0) {
2190 var
->location
= (state
->target
== vertex_shader
)
2191 ? (qual
->location
+ VERT_ATTRIB_GENERIC0
)
2192 : (qual
->location
+ FRAG_RESULT_DATA0
);
2194 var
->location
= qual
->location
;
2197 if (qual
->flags
.q
.explicit_index
) {
2198 /* From the GLSL 4.30 specification, section 4.4.2 (Output
2199 * Layout Qualifiers):
2201 * "It is also a compile-time error if a fragment shader
2202 * sets a layout index to less than 0 or greater than 1."
2204 * Older specifications don't mandate a behavior; we take
2205 * this as a clarification and always generate the error.
2207 if (qual
->index
< 0 || qual
->index
> 1) {
2208 _mesa_glsl_error(loc
, state
,
2209 "explicit index may only be 0 or 1");
2211 var
->explicit_index
= true;
2212 var
->index
= qual
->index
;
2216 } else if (qual
->flags
.q
.explicit_index
) {
2217 _mesa_glsl_error(loc
, state
,
2218 "explicit index requires explicit location");
2221 if (qual
->flags
.q
.explicit_binding
&&
2222 validate_binding_qualifier(state
, loc
, var
, qual
)) {
2223 var
->explicit_binding
= true;
2224 var
->binding
= qual
->binding
;
2227 /* Does the declaration use the deprecated 'attribute' or 'varying'
2230 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
2231 || qual
->flags
.q
.varying
;
2233 /* Is the 'layout' keyword used with parameters that allow relaxed checking.
2234 * Many implementations of GL_ARB_fragment_coord_conventions_enable and some
2235 * implementations (only Mesa?) GL_ARB_explicit_attrib_location_enable
2236 * allowed the layout qualifier to be used with 'varying' and 'attribute'.
2237 * These extensions and all following extensions that add the 'layout'
2238 * keyword have been modified to require the use of 'in' or 'out'.
2240 * The following extension do not allow the deprecated keywords:
2242 * GL_AMD_conservative_depth
2243 * GL_ARB_conservative_depth
2244 * GL_ARB_gpu_shader5
2245 * GL_ARB_separate_shader_objects
2246 * GL_ARB_tesselation_shader
2247 * GL_ARB_transform_feedback3
2248 * GL_ARB_uniform_buffer_object
2250 * It is unknown whether GL_EXT_shader_image_load_store or GL_NV_gpu_shader5
2251 * allow layout with the deprecated keywords.
2253 const bool relaxed_layout_qualifier_checking
=
2254 state
->ARB_fragment_coord_conventions_enable
;
2256 if (qual
->has_layout() && uses_deprecated_qualifier
) {
2257 if (relaxed_layout_qualifier_checking
) {
2258 _mesa_glsl_warning(loc
, state
,
2259 "`layout' qualifier may not be used with "
2260 "`attribute' or `varying'");
2262 _mesa_glsl_error(loc
, state
,
2263 "`layout' qualifier may not be used with "
2264 "`attribute' or `varying'");
2268 /* Layout qualifiers for gl_FragDepth, which are enabled by extension
2269 * AMD_conservative_depth.
2271 int depth_layout_count
= qual
->flags
.q
.depth_any
2272 + qual
->flags
.q
.depth_greater
2273 + qual
->flags
.q
.depth_less
2274 + qual
->flags
.q
.depth_unchanged
;
2275 if (depth_layout_count
> 0
2276 && !state
->AMD_conservative_depth_enable
2277 && !state
->ARB_conservative_depth_enable
) {
2278 _mesa_glsl_error(loc
, state
,
2279 "extension GL_AMD_conservative_depth or "
2280 "GL_ARB_conservative_depth must be enabled "
2281 "to use depth layout qualifiers");
2282 } else if (depth_layout_count
> 0
2283 && strcmp(var
->name
, "gl_FragDepth") != 0) {
2284 _mesa_glsl_error(loc
, state
,
2285 "depth layout qualifiers can be applied only to "
2287 } else if (depth_layout_count
> 1
2288 && strcmp(var
->name
, "gl_FragDepth") == 0) {
2289 _mesa_glsl_error(loc
, state
,
2290 "at most one depth layout qualifier can be applied to "
2293 if (qual
->flags
.q
.depth_any
)
2294 var
->depth_layout
= ir_depth_layout_any
;
2295 else if (qual
->flags
.q
.depth_greater
)
2296 var
->depth_layout
= ir_depth_layout_greater
;
2297 else if (qual
->flags
.q
.depth_less
)
2298 var
->depth_layout
= ir_depth_layout_less
;
2299 else if (qual
->flags
.q
.depth_unchanged
)
2300 var
->depth_layout
= ir_depth_layout_unchanged
;
2302 var
->depth_layout
= ir_depth_layout_none
;
2304 if (qual
->flags
.q
.std140
||
2305 qual
->flags
.q
.packed
||
2306 qual
->flags
.q
.shared
) {
2307 _mesa_glsl_error(loc
, state
,
2308 "uniform block layout qualifiers std140, packed, and "
2309 "shared can only be applied to uniform blocks, not "
2313 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
2314 validate_matrix_layout_for_type(state
, loc
, var
->type
, var
);
2319 * Get the variable that is being redeclared by this declaration
2321 * Semantic checks to verify the validity of the redeclaration are also
2322 * performed. If semantic checks fail, compilation error will be emitted via
2323 * \c _mesa_glsl_error, but a non-\c NULL pointer will still be returned.
2326 * A pointer to an existing variable in the current scope if the declaration
2327 * is a redeclaration, \c NULL otherwise.
2329 static ir_variable
*
2330 get_variable_being_redeclared(ir_variable
*var
, YYLTYPE loc
,
2331 struct _mesa_glsl_parse_state
*state
,
2332 bool allow_all_redeclarations
)
2334 /* Check if this declaration is actually a re-declaration, either to
2335 * resize an array or add qualifiers to an existing variable.
2337 * This is allowed for variables in the current scope, or when at
2338 * global scope (for built-ins in the implicit outer scope).
2340 ir_variable
*earlier
= state
->symbols
->get_variable(var
->name
);
2341 if (earlier
== NULL
||
2342 (state
->current_function
!= NULL
&&
2343 !state
->symbols
->name_declared_this_scope(var
->name
))) {
2348 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec,
2350 * "It is legal to declare an array without a size and then
2351 * later re-declare the same name as an array of the same
2352 * type and specify a size."
2354 if ((earlier
->type
->array_size() == 0)
2355 && var
->type
->is_array()
2356 && (var
->type
->element_type() == earlier
->type
->element_type())) {
2357 /* FINISHME: This doesn't match the qualifiers on the two
2358 * FINISHME: declarations. It's not 100% clear whether this is
2359 * FINISHME: required or not.
2362 const unsigned size
= unsigned(var
->type
->array_size());
2363 check_builtin_array_max_size(var
->name
, size
, loc
, state
);
2364 if ((size
> 0) && (size
<= earlier
->max_array_access
)) {
2365 _mesa_glsl_error(& loc
, state
, "array size must be > %u due to "
2367 earlier
->max_array_access
);
2370 earlier
->type
= var
->type
;
2373 } else if ((state
->ARB_fragment_coord_conventions_enable
||
2374 state
->is_version(150, 0))
2375 && strcmp(var
->name
, "gl_FragCoord") == 0
2376 && earlier
->type
== var
->type
2377 && earlier
->mode
== var
->mode
) {
2378 /* Allow redeclaration of gl_FragCoord for ARB_fcc layout
2381 earlier
->origin_upper_left
= var
->origin_upper_left
;
2382 earlier
->pixel_center_integer
= var
->pixel_center_integer
;
2384 /* According to section 4.3.7 of the GLSL 1.30 spec,
2385 * the following built-in varaibles can be redeclared with an
2386 * interpolation qualifier:
2389 * * gl_FrontSecondaryColor
2390 * * gl_BackSecondaryColor
2392 * * gl_SecondaryColor
2394 } else if (state
->is_version(130, 0)
2395 && (strcmp(var
->name
, "gl_FrontColor") == 0
2396 || strcmp(var
->name
, "gl_BackColor") == 0
2397 || strcmp(var
->name
, "gl_FrontSecondaryColor") == 0
2398 || strcmp(var
->name
, "gl_BackSecondaryColor") == 0
2399 || strcmp(var
->name
, "gl_Color") == 0
2400 || strcmp(var
->name
, "gl_SecondaryColor") == 0)
2401 && earlier
->type
== var
->type
2402 && earlier
->mode
== var
->mode
) {
2403 earlier
->interpolation
= var
->interpolation
;
2405 /* Layout qualifiers for gl_FragDepth. */
2406 } else if ((state
->AMD_conservative_depth_enable
||
2407 state
->ARB_conservative_depth_enable
)
2408 && strcmp(var
->name
, "gl_FragDepth") == 0
2409 && earlier
->type
== var
->type
2410 && earlier
->mode
== var
->mode
) {
2412 /** From the AMD_conservative_depth spec:
2413 * Within any shader, the first redeclarations of gl_FragDepth
2414 * must appear before any use of gl_FragDepth.
2416 if (earlier
->used
) {
2417 _mesa_glsl_error(&loc
, state
,
2418 "the first redeclaration of gl_FragDepth "
2419 "must appear before any use of gl_FragDepth");
2422 /* Prevent inconsistent redeclaration of depth layout qualifier. */
2423 if (earlier
->depth_layout
!= ir_depth_layout_none
2424 && earlier
->depth_layout
!= var
->depth_layout
) {
2425 _mesa_glsl_error(&loc
, state
,
2426 "gl_FragDepth: depth layout is declared here "
2427 "as '%s, but it was previously declared as "
2429 depth_layout_string(var
->depth_layout
),
2430 depth_layout_string(earlier
->depth_layout
));
2433 earlier
->depth_layout
= var
->depth_layout
;
2435 } else if (allow_all_redeclarations
) {
2436 if (earlier
->mode
!= var
->mode
) {
2437 _mesa_glsl_error(&loc
, state
,
2438 "redeclaration of `%s' with incorrect qualifiers",
2440 } else if (earlier
->type
!= var
->type
) {
2441 _mesa_glsl_error(&loc
, state
,
2442 "redeclaration of `%s' has incorrect type",
2446 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", var
->name
);
2453 * Generate the IR for an initializer in a variable declaration
2456 process_initializer(ir_variable
*var
, ast_declaration
*decl
,
2457 ast_fully_specified_type
*type
,
2458 exec_list
*initializer_instructions
,
2459 struct _mesa_glsl_parse_state
*state
)
2461 ir_rvalue
*result
= NULL
;
2463 YYLTYPE initializer_loc
= decl
->initializer
->get_location();
2465 /* From page 24 (page 30 of the PDF) of the GLSL 1.10 spec:
2467 * "All uniform variables are read-only and are initialized either
2468 * directly by an application via API commands, or indirectly by
2471 if (var
->mode
== ir_var_uniform
) {
2472 state
->check_version(120, 0, &initializer_loc
,
2473 "cannot initialize uniforms");
2476 if (var
->type
->is_sampler()) {
2477 _mesa_glsl_error(& initializer_loc
, state
,
2478 "cannot initialize samplers");
2481 if ((var
->mode
== ir_var_shader_in
) && (state
->current_function
== NULL
)) {
2482 _mesa_glsl_error(& initializer_loc
, state
,
2483 "cannot initialize %s shader input / %s",
2484 _mesa_glsl_shader_target_name(state
->target
),
2485 (state
->target
== vertex_shader
)
2486 ? "attribute" : "varying");
2489 ir_dereference
*const lhs
= new(state
) ir_dereference_variable(var
);
2490 ir_rvalue
*rhs
= decl
->initializer
->hir(initializer_instructions
,
2493 /* Calculate the constant value if this is a const or uniform
2496 if (type
->qualifier
.flags
.q
.constant
2497 || type
->qualifier
.flags
.q
.uniform
) {
2498 ir_rvalue
*new_rhs
= validate_assignment(state
, var
->type
, rhs
, true);
2499 if (new_rhs
!= NULL
) {
2502 ir_constant
*constant_value
= rhs
->constant_expression_value();
2503 if (!constant_value
) {
2504 /* If ARB_shading_language_420pack is enabled, initializers of
2505 * const-qualified local variables do not have to be constant
2506 * expressions. Const-qualified global variables must still be
2507 * initialized with constant expressions.
2509 if (!state
->ARB_shading_language_420pack_enable
2510 || state
->current_function
== NULL
) {
2511 _mesa_glsl_error(& initializer_loc
, state
,
2512 "initializer of %s variable `%s' must be a "
2513 "constant expression",
2514 (type
->qualifier
.flags
.q
.constant
)
2515 ? "const" : "uniform",
2517 if (var
->type
->is_numeric()) {
2518 /* Reduce cascading errors. */
2519 var
->constant_value
= ir_constant::zero(state
, var
->type
);
2523 rhs
= constant_value
;
2524 var
->constant_value
= constant_value
;
2527 _mesa_glsl_error(&initializer_loc
, state
,
2528 "initializer of type %s cannot be assigned to "
2529 "variable of type %s",
2530 rhs
->type
->name
, var
->type
->name
);
2531 if (var
->type
->is_numeric()) {
2532 /* Reduce cascading errors. */
2533 var
->constant_value
= ir_constant::zero(state
, var
->type
);
2538 if (rhs
&& !rhs
->type
->is_error()) {
2539 bool temp
= var
->read_only
;
2540 if (type
->qualifier
.flags
.q
.constant
)
2541 var
->read_only
= false;
2543 /* Never emit code to initialize a uniform.
2545 const glsl_type
*initializer_type
;
2546 if (!type
->qualifier
.flags
.q
.uniform
) {
2547 result
= do_assignment(initializer_instructions
, state
,
2550 type
->get_location());
2551 initializer_type
= result
->type
;
2553 initializer_type
= rhs
->type
;
2555 var
->constant_initializer
= rhs
->constant_expression_value();
2556 var
->has_initializer
= true;
2558 /* If the declared variable is an unsized array, it must inherrit
2559 * its full type from the initializer. A declaration such as
2561 * uniform float a[] = float[](1.0, 2.0, 3.0, 3.0);
2565 * uniform float a[4] = float[](1.0, 2.0, 3.0, 3.0);
2567 * The assignment generated in the if-statement (below) will also
2568 * automatically handle this case for non-uniforms.
2570 * If the declared variable is not an array, the types must
2571 * already match exactly. As a result, the type assignment
2572 * here can be done unconditionally. For non-uniforms the call
2573 * to do_assignment can change the type of the initializer (via
2574 * the implicit conversion rules). For uniforms the initializer
2575 * must be a constant expression, and the type of that expression
2576 * was validated above.
2578 var
->type
= initializer_type
;
2580 var
->read_only
= temp
;
2588 * Do additional processing necessary for geometry shader input declarations
2589 * (this covers both interface blocks arrays and bare input variables).
2592 handle_geometry_shader_input_decl(struct _mesa_glsl_parse_state
*state
,
2593 YYLTYPE loc
, ir_variable
*var
)
2595 unsigned num_vertices
= 0;
2596 if (state
->gs_input_prim_type_specified
) {
2597 num_vertices
= vertices_per_prim(state
->gs_input_prim_type
);
2600 /* Geometry shader input variables must be arrays. Caller should have
2601 * reported an error for this.
2603 if (!var
->type
->is_array()) {
2604 assert(state
->error
);
2606 /* To avoid cascading failures, short circuit the checks below. */
2610 if (var
->type
->length
== 0) {
2611 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec says:
2613 * All geometry shader input unsized array declarations will be
2614 * sized by an earlier input layout qualifier, when present, as per
2615 * the following table.
2617 * Followed by a table mapping each allowed input layout qualifier to
2618 * the corresponding input length.
2620 if (num_vertices
!= 0)
2621 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
2624 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec
2625 * includes the following examples of compile-time errors:
2627 * // code sequence within one shader...
2628 * in vec4 Color1[]; // size unknown
2629 * ...Color1.length()...// illegal, length() unknown
2630 * in vec4 Color2[2]; // size is 2
2631 * ...Color1.length()...// illegal, Color1 still has no size
2632 * in vec4 Color3[3]; // illegal, input sizes are inconsistent
2633 * layout(lines) in; // legal, input size is 2, matching
2634 * in vec4 Color4[3]; // illegal, contradicts layout
2637 * To detect the case illustrated by Color3, we verify that the size of
2638 * an explicitly-sized array matches the size of any previously declared
2639 * explicitly-sized array. To detect the case illustrated by Color4, we
2640 * verify that the size of an explicitly-sized array is consistent with
2641 * any previously declared input layout.
2643 if (num_vertices
!= 0 && var
->type
->length
!= num_vertices
) {
2644 _mesa_glsl_error(&loc
, state
,
2645 "geometry shader input size contradicts previously"
2646 " declared layout (size is %u, but layout requires a"
2647 " size of %u)", var
->type
->length
, num_vertices
);
2648 } else if (state
->gs_input_size
!= 0 &&
2649 var
->type
->length
!= state
->gs_input_size
) {
2650 _mesa_glsl_error(&loc
, state
,
2651 "geometry shader input sizes are "
2652 "inconsistent (size is %u, but a previous "
2653 "declaration has size %u)",
2654 var
->type
->length
, state
->gs_input_size
);
2656 state
->gs_input_size
= var
->type
->length
;
2663 validate_identifier(const char *identifier
, YYLTYPE loc
,
2664 struct _mesa_glsl_parse_state
*state
)
2666 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
2668 * "Identifiers starting with "gl_" are reserved for use by
2669 * OpenGL, and may not be declared in a shader as either a
2670 * variable or a function."
2672 if (strncmp(identifier
, "gl_", 3) == 0) {
2673 _mesa_glsl_error(&loc
, state
,
2674 "identifier `%s' uses reserved `gl_' prefix",
2676 } else if (strstr(identifier
, "__")) {
2677 /* From page 14 (page 20 of the PDF) of the GLSL 1.10
2680 * "In addition, all identifiers containing two
2681 * consecutive underscores (__) are reserved as
2682 * possible future keywords."
2684 _mesa_glsl_error(&loc
, state
,
2685 "identifier `%s' uses reserved `__' string",
2692 ast_declarator_list::hir(exec_list
*instructions
,
2693 struct _mesa_glsl_parse_state
*state
)
2696 const struct glsl_type
*decl_type
;
2697 const char *type_name
= NULL
;
2698 ir_rvalue
*result
= NULL
;
2699 YYLTYPE loc
= this->get_location();
2701 /* From page 46 (page 52 of the PDF) of the GLSL 1.50 spec:
2703 * "To ensure that a particular output variable is invariant, it is
2704 * necessary to use the invariant qualifier. It can either be used to
2705 * qualify a previously declared variable as being invariant
2707 * invariant gl_Position; // make existing gl_Position be invariant"
2709 * In these cases the parser will set the 'invariant' flag in the declarator
2710 * list, and the type will be NULL.
2712 if (this->invariant
) {
2713 assert(this->type
== NULL
);
2715 if (state
->current_function
!= NULL
) {
2716 _mesa_glsl_error(& loc
, state
,
2717 "all uses of `invariant' keyword must be at global "
2721 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
2722 assert(!decl
->is_array
);
2723 assert(decl
->array_size
== NULL
);
2724 assert(decl
->initializer
== NULL
);
2726 ir_variable
*const earlier
=
2727 state
->symbols
->get_variable(decl
->identifier
);
2728 if (earlier
== NULL
) {
2729 _mesa_glsl_error(& loc
, state
,
2730 "undeclared variable `%s' cannot be marked "
2731 "invariant", decl
->identifier
);
2732 } else if ((state
->target
== vertex_shader
)
2733 && (earlier
->mode
!= ir_var_shader_out
)) {
2734 _mesa_glsl_error(& loc
, state
,
2735 "`%s' cannot be marked invariant, vertex shader "
2736 "outputs only", decl
->identifier
);
2737 } else if ((state
->target
== fragment_shader
)
2738 && (earlier
->mode
!= ir_var_shader_in
)) {
2739 _mesa_glsl_error(& loc
, state
,
2740 "`%s' cannot be marked invariant, fragment shader "
2741 "inputs only", decl
->identifier
);
2742 } else if (earlier
->used
) {
2743 _mesa_glsl_error(& loc
, state
,
2744 "variable `%s' may not be redeclared "
2745 "`invariant' after being used",
2748 earlier
->invariant
= true;
2752 /* Invariant redeclarations do not have r-values.
2757 assert(this->type
!= NULL
);
2758 assert(!this->invariant
);
2760 /* The type specifier may contain a structure definition. Process that
2761 * before any of the variable declarations.
2763 (void) this->type
->specifier
->hir(instructions
, state
);
2765 decl_type
= this->type
->glsl_type(& type_name
, state
);
2766 if (this->declarations
.is_empty()) {
2767 /* If there is no structure involved in the program text, there are two
2768 * possible scenarios:
2770 * - The program text contained something like 'vec4;'. This is an
2771 * empty declaration. It is valid but weird. Emit a warning.
2773 * - The program text contained something like 'S;' and 'S' is not the
2774 * name of a known structure type. This is both invalid and weird.
2777 * - The program text contained something like 'mediump float;'
2778 * when the programmer probably meant 'precision mediump
2779 * float;' Emit a warning with a description of what they
2780 * probably meant to do.
2782 * Note that if decl_type is NULL and there is a structure involved,
2783 * there must have been some sort of error with the structure. In this
2784 * case we assume that an error was already generated on this line of
2785 * code for the structure. There is no need to generate an additional,
2788 assert(this->type
->specifier
->structure
== NULL
|| decl_type
!= NULL
2791 if (decl_type
== NULL
) {
2792 _mesa_glsl_error(&loc
, state
,
2793 "invalid type `%s' in empty declaration",
2795 } else if (this->type
->qualifier
.precision
!= ast_precision_none
) {
2796 if (this->type
->specifier
->structure
!= NULL
) {
2797 _mesa_glsl_error(&loc
, state
,
2798 "precision qualifiers can't be applied "
2801 static const char *const precision_names
[] = {
2808 _mesa_glsl_warning(&loc
, state
,
2809 "empty declaration with precision qualifier, "
2810 "to set the default precision, use "
2811 "`precision %s %s;'",
2812 precision_names
[this->type
->qualifier
.precision
],
2816 _mesa_glsl_warning(&loc
, state
, "empty declaration");
2820 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
2821 const struct glsl_type
*var_type
;
2824 /* FINISHME: Emit a warning if a variable declaration shadows a
2825 * FINISHME: declaration at a higher scope.
2828 if ((decl_type
== NULL
) || decl_type
->is_void()) {
2829 if (type_name
!= NULL
) {
2830 _mesa_glsl_error(& loc
, state
,
2831 "invalid type `%s' in declaration of `%s'",
2832 type_name
, decl
->identifier
);
2834 _mesa_glsl_error(& loc
, state
,
2835 "invalid type in declaration of `%s'",
2841 if (decl
->is_array
) {
2842 var_type
= process_array_type(&loc
, decl_type
, decl
->array_size
,
2844 if (var_type
->is_error())
2847 var_type
= decl_type
;
2850 var
= new(ctx
) ir_variable(var_type
, decl
->identifier
, ir_var_auto
);
2852 /* The 'varying in' and 'varying out' qualifiers can only be used with
2853 * ARB_geometry_shader4 and EXT_geometry_shader4, which we don't support
2856 if (this->type
->qualifier
.flags
.q
.varying
) {
2857 if (this->type
->qualifier
.flags
.q
.in
) {
2858 _mesa_glsl_error(& loc
, state
,
2859 "`varying in' qualifier in declaration of "
2860 "`%s' only valid for geometry shaders using "
2861 "ARB_geometry_shader4 or EXT_geometry_shader4",
2863 } else if (this->type
->qualifier
.flags
.q
.out
) {
2864 _mesa_glsl_error(& loc
, state
,
2865 "`varying out' qualifier in declaration of "
2866 "`%s' only valid for geometry shaders using "
2867 "ARB_geometry_shader4 or EXT_geometry_shader4",
2872 /* From page 22 (page 28 of the PDF) of the GLSL 1.10 specification;
2874 * "Global variables can only use the qualifiers const,
2875 * attribute, uni form, or varying. Only one may be
2878 * Local variables can only use the qualifier const."
2880 * This is relaxed in GLSL 1.30 and GLSL ES 3.00. It is also relaxed by
2881 * any extension that adds the 'layout' keyword.
2883 if (!state
->is_version(130, 300)
2884 && !state
->has_explicit_attrib_location()
2885 && !state
->ARB_fragment_coord_conventions_enable
) {
2886 if (this->type
->qualifier
.flags
.q
.out
) {
2887 _mesa_glsl_error(& loc
, state
,
2888 "`out' qualifier in declaration of `%s' "
2889 "only valid for function parameters in %s",
2890 decl
->identifier
, state
->get_version_string());
2892 if (this->type
->qualifier
.flags
.q
.in
) {
2893 _mesa_glsl_error(& loc
, state
,
2894 "`in' qualifier in declaration of `%s' "
2895 "only valid for function parameters in %s",
2896 decl
->identifier
, state
->get_version_string());
2898 /* FINISHME: Test for other invalid qualifiers. */
2901 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
,
2904 if (this->type
->qualifier
.flags
.q
.invariant
) {
2905 if ((state
->target
== vertex_shader
) &&
2906 var
->mode
!= ir_var_shader_out
) {
2907 _mesa_glsl_error(& loc
, state
,
2908 "`%s' cannot be marked invariant, vertex shader "
2909 "outputs only", var
->name
);
2910 } else if ((state
->target
== fragment_shader
) &&
2911 var
->mode
!= ir_var_shader_in
) {
2912 /* FINISHME: Note that this doesn't work for invariant on
2913 * a function signature inval
2915 _mesa_glsl_error(& loc
, state
,
2916 "`%s' cannot be marked invariant, fragment shader "
2917 "inputs only", var
->name
);
2921 if (state
->current_function
!= NULL
) {
2922 const char *mode
= NULL
;
2923 const char *extra
= "";
2925 /* There is no need to check for 'inout' here because the parser will
2926 * only allow that in function parameter lists.
2928 if (this->type
->qualifier
.flags
.q
.attribute
) {
2930 } else if (this->type
->qualifier
.flags
.q
.uniform
) {
2932 } else if (this->type
->qualifier
.flags
.q
.varying
) {
2934 } else if (this->type
->qualifier
.flags
.q
.in
) {
2936 extra
= " or in function parameter list";
2937 } else if (this->type
->qualifier
.flags
.q
.out
) {
2939 extra
= " or in function parameter list";
2943 _mesa_glsl_error(& loc
, state
,
2944 "%s variable `%s' must be declared at "
2946 mode
, var
->name
, extra
);
2948 } else if (var
->mode
== ir_var_shader_in
) {
2949 var
->read_only
= true;
2951 if (state
->target
== vertex_shader
) {
2952 bool error_emitted
= false;
2954 /* From page 31 (page 37 of the PDF) of the GLSL 1.50 spec:
2956 * "Vertex shader inputs can only be float, floating-point
2957 * vectors, matrices, signed and unsigned integers and integer
2958 * vectors. Vertex shader inputs can also form arrays of these
2959 * types, but not structures."
2961 * From page 31 (page 27 of the PDF) of the GLSL 1.30 spec:
2963 * "Vertex shader inputs can only be float, floating-point
2964 * vectors, matrices, signed and unsigned integers and integer
2965 * vectors. They cannot be arrays or structures."
2967 * From page 23 (page 29 of the PDF) of the GLSL 1.20 spec:
2969 * "The attribute qualifier can be used only with float,
2970 * floating-point vectors, and matrices. Attribute variables
2971 * cannot be declared as arrays or structures."
2973 * From page 33 (page 39 of the PDF) of the GLSL ES 3.00 spec:
2975 * "Vertex shader inputs can only be float, floating-point
2976 * vectors, matrices, signed and unsigned integers and integer
2977 * vectors. Vertex shader inputs cannot be arrays or
2980 const glsl_type
*check_type
= var
->type
->is_array()
2981 ? var
->type
->fields
.array
: var
->type
;
2983 switch (check_type
->base_type
) {
2984 case GLSL_TYPE_FLOAT
:
2986 case GLSL_TYPE_UINT
:
2988 if (state
->is_version(120, 300))
2992 _mesa_glsl_error(& loc
, state
,
2993 "vertex shader input / attribute cannot have "
2995 var
->type
->is_array() ? "array of " : "",
2997 error_emitted
= true;
3000 if (!error_emitted
&& var
->type
->is_array() &&
3001 !state
->check_version(150, 0, &loc
,
3002 "vertex shader input / attribute "
3003 "cannot have array type")) {
3004 error_emitted
= true;
3006 } else if (state
->target
== geometry_shader
) {
3007 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
3009 * Geometry shader input variables get the per-vertex values
3010 * written out by vertex shader output variables of the same
3011 * names. Since a geometry shader operates on a set of
3012 * vertices, each input varying variable (or input block, see
3013 * interface blocks below) needs to be declared as an array.
3015 if (!var
->type
->is_array()) {
3016 _mesa_glsl_error(&loc
, state
,
3017 "geometry shader inputs must be arrays");
3020 handle_geometry_shader_input_decl(state
, loc
, var
);
3024 /* Integer fragment inputs must be qualified with 'flat'. In GLSL ES,
3025 * so must integer vertex outputs.
3027 * From section 4.3.4 ("Inputs") of the GLSL 1.50 spec:
3028 * "Fragment shader inputs that are signed or unsigned integers or
3029 * integer vectors must be qualified with the interpolation qualifier
3032 * From section 4.3.4 ("Input Variables") of the GLSL 3.00 ES spec:
3033 * "Fragment shader inputs that are, or contain, signed or unsigned
3034 * integers or integer vectors must be qualified with the
3035 * interpolation qualifier flat."
3037 * From section 4.3.6 ("Output Variables") of the GLSL 3.00 ES spec:
3038 * "Vertex shader outputs that are, or contain, signed or unsigned
3039 * integers or integer vectors must be qualified with the
3040 * interpolation qualifier flat."
3042 * Note that prior to GLSL 1.50, this requirement applied to vertex
3043 * outputs rather than fragment inputs. That creates problems in the
3044 * presence of geometry shaders, so we adopt the GLSL 1.50 rule for all
3045 * desktop GL shaders. For GLSL ES shaders, we follow the spec and
3046 * apply the restriction to both vertex outputs and fragment inputs.
3048 * Note also that the desktop GLSL specs are missing the text "or
3049 * contain"; this is presumably an oversight, since there is no
3050 * reasonable way to interpolate a fragment shader input that contains
3053 if (state
->is_version(130, 300) &&
3054 var
->type
->contains_integer() &&
3055 var
->interpolation
!= INTERP_QUALIFIER_FLAT
&&
3056 ((state
->target
== fragment_shader
&& var
->mode
== ir_var_shader_in
)
3057 || (state
->target
== vertex_shader
&& var
->mode
== ir_var_shader_out
3058 && state
->es_shader
))) {
3059 const char *var_type
= (state
->target
== vertex_shader
) ?
3060 "vertex output" : "fragment input";
3061 _mesa_glsl_error(&loc
, state
, "if a %s is (or contains) "
3062 "an integer, then it must be qualified with 'flat'",
3067 /* Interpolation qualifiers cannot be applied to 'centroid' and
3068 * 'centroid varying'.
3070 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
3071 * "interpolation qualifiers may only precede the qualifiers in,
3072 * centroid in, out, or centroid out in a declaration. They do not apply
3073 * to the deprecated storage qualifiers varying or centroid varying."
3075 * These deprecated storage qualifiers do not exist in GLSL ES 3.00.
3077 if (state
->is_version(130, 0)
3078 && this->type
->qualifier
.has_interpolation()
3079 && this->type
->qualifier
.flags
.q
.varying
) {
3081 const char *i
= this->type
->qualifier
.interpolation_string();
3084 if (this->type
->qualifier
.flags
.q
.centroid
)
3085 s
= "centroid varying";
3089 _mesa_glsl_error(&loc
, state
,
3090 "qualifier '%s' cannot be applied to the "
3091 "deprecated storage qualifier '%s'", i
, s
);
3095 /* Interpolation qualifiers can only apply to vertex shader outputs and
3096 * fragment shader inputs.
3098 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
3099 * "Outputs from a vertex shader (out) and inputs to a fragment
3100 * shader (in) can be further qualified with one or more of these
3101 * interpolation qualifiers"
3103 * From page 31 (page 37 of the PDF) of the GLSL ES 3.00 spec:
3104 * "These interpolation qualifiers may only precede the qualifiers
3105 * in, centroid in, out, or centroid out in a declaration. They do
3106 * not apply to inputs into a vertex shader or outputs from a
3109 if (state
->is_version(130, 300)
3110 && this->type
->qualifier
.has_interpolation()) {
3112 const char *i
= this->type
->qualifier
.interpolation_string();
3115 switch (state
->target
) {
3117 if (this->type
->qualifier
.flags
.q
.in
) {
3118 _mesa_glsl_error(&loc
, state
,
3119 "qualifier '%s' cannot be applied to vertex "
3120 "shader inputs", i
);
3123 case fragment_shader
:
3124 if (this->type
->qualifier
.flags
.q
.out
) {
3125 _mesa_glsl_error(&loc
, state
,
3126 "qualifier '%s' cannot be applied to fragment "
3127 "shader outputs", i
);
3136 /* From section 4.3.4 of the GLSL 1.30 spec:
3137 * "It is an error to use centroid in in a vertex shader."
3139 * From section 4.3.4 of the GLSL ES 3.00 spec:
3140 * "It is an error to use centroid in or interpolation qualifiers in
3141 * a vertex shader input."
3143 if (state
->is_version(130, 300)
3144 && this->type
->qualifier
.flags
.q
.centroid
3145 && this->type
->qualifier
.flags
.q
.in
3146 && state
->target
== vertex_shader
) {
3148 _mesa_glsl_error(&loc
, state
,
3149 "'centroid in' cannot be used in a vertex shader");
3152 /* Section 4.3.6 of the GLSL 1.30 specification states:
3153 * "It is an error to use centroid out in a fragment shader."
3155 * The GL_ARB_shading_language_420pack extension specification states:
3156 * "It is an error to use auxiliary storage qualifiers or interpolation
3157 * qualifiers on an output in a fragment shader."
3159 if (state
->target
== fragment_shader
&&
3160 this->type
->qualifier
.flags
.q
.out
&&
3161 this->type
->qualifier
.has_auxiliary_storage()) {
3162 _mesa_glsl_error(&loc
, state
,
3163 "auxiliary storage qualifiers cannot be used on "
3164 "fragment shader outputs");
3167 /* Precision qualifiers exists only in GLSL versions 1.00 and >= 1.30.
3169 if (this->type
->qualifier
.precision
!= ast_precision_none
) {
3170 state
->check_precision_qualifiers_allowed(&loc
);
3174 /* Precision qualifiers apply to floating point, integer and sampler
3177 * Section 4.5.2 (Precision Qualifiers) of the GLSL 1.30 spec says:
3178 * "Any floating point or any integer declaration can have the type
3179 * preceded by one of these precision qualifiers [...] Literal
3180 * constants do not have precision qualifiers. Neither do Boolean
3183 * Section 4.5 (Precision and Precision Qualifiers) of the GLSL 1.30
3186 * "Precision qualifiers are added for code portability with OpenGL
3187 * ES, not for functionality. They have the same syntax as in OpenGL
3190 * Section 8 (Built-In Functions) of the GLSL ES 1.00 spec says:
3192 * "uniform lowp sampler2D sampler;
3195 * lowp vec4 col = texture2D (sampler, coord);
3196 * // texture2D returns lowp"
3198 * From this, we infer that GLSL 1.30 (and later) should allow precision
3199 * qualifiers on sampler types just like float and integer types.
3201 if (this->type
->qualifier
.precision
!= ast_precision_none
3202 && !var
->type
->is_float()
3203 && !var
->type
->is_integer()
3204 && !var
->type
->is_record()
3205 && !var
->type
->is_sampler()
3206 && !(var
->type
->is_array()
3207 && (var
->type
->fields
.array
->is_float()
3208 || var
->type
->fields
.array
->is_integer()))) {
3210 _mesa_glsl_error(&loc
, state
,
3211 "precision qualifiers apply only to floating point"
3212 ", integer and sampler types");
3215 /* From page 17 (page 23 of the PDF) of the GLSL 1.20 spec:
3217 * "[Sampler types] can only be declared as function
3218 * parameters or uniform variables (see Section 4.3.5
3221 if (var_type
->contains_sampler() &&
3222 !this->type
->qualifier
.flags
.q
.uniform
) {
3223 _mesa_glsl_error(&loc
, state
, "samplers must be declared uniform");
3226 /* Process the initializer and add its instructions to a temporary
3227 * list. This list will be added to the instruction stream (below) after
3228 * the declaration is added. This is done because in some cases (such as
3229 * redeclarations) the declaration may not actually be added to the
3230 * instruction stream.
3232 exec_list initializer_instructions
;
3233 ir_variable
*earlier
=
3234 get_variable_being_redeclared(var
, decl
->get_location(), state
,
3235 false /* allow_all_redeclarations */);
3237 if (decl
->initializer
!= NULL
) {
3238 result
= process_initializer((earlier
== NULL
) ? var
: earlier
,
3240 &initializer_instructions
, state
);
3243 /* From page 23 (page 29 of the PDF) of the GLSL 1.10 spec:
3245 * "It is an error to write to a const variable outside of
3246 * its declaration, so they must be initialized when
3249 if (this->type
->qualifier
.flags
.q
.constant
&& decl
->initializer
== NULL
) {
3250 _mesa_glsl_error(& loc
, state
,
3251 "const declaration of `%s' must be initialized",
3255 if (state
->es_shader
) {
3256 const glsl_type
*const t
= (earlier
== NULL
)
3257 ? var
->type
: earlier
->type
;
3259 if (t
->is_array() && t
->length
== 0)
3260 /* Section 10.17 of the GLSL ES 1.00 specification states that
3261 * unsized array declarations have been removed from the language.
3262 * Arrays that are sized using an initializer are still explicitly
3263 * sized. However, GLSL ES 1.00 does not allow array
3264 * initializers. That is only allowed in GLSL ES 3.00.
3266 * Section 4.1.9 (Arrays) of the GLSL ES 3.00 spec says:
3268 * "An array type can also be formed without specifying a size
3269 * if the definition includes an initializer:
3271 * float x[] = float[2] (1.0, 2.0); // declares an array of size 2
3272 * float y[] = float[] (1.0, 2.0, 3.0); // declares an array of size 3
3277 _mesa_glsl_error(& loc
, state
,
3278 "unsized array declarations are not allowed in "
3282 /* If the declaration is not a redeclaration, there are a few additional
3283 * semantic checks that must be applied. In addition, variable that was
3284 * created for the declaration should be added to the IR stream.
3286 if (earlier
== NULL
) {
3287 validate_identifier(decl
->identifier
, loc
, state
);
3289 /* Add the variable to the symbol table. Note that the initializer's
3290 * IR was already processed earlier (though it hasn't been emitted
3291 * yet), without the variable in scope.
3293 * This differs from most C-like languages, but it follows the GLSL
3294 * specification. From page 28 (page 34 of the PDF) of the GLSL 1.50
3297 * "Within a declaration, the scope of a name starts immediately
3298 * after the initializer if present or immediately after the name
3299 * being declared if not."
3301 if (!state
->symbols
->add_variable(var
)) {
3302 YYLTYPE loc
= this->get_location();
3303 _mesa_glsl_error(&loc
, state
, "name `%s' already taken in the "
3304 "current scope", decl
->identifier
);
3308 /* Push the variable declaration to the top. It means that all the
3309 * variable declarations will appear in a funny last-to-first order,
3310 * but otherwise we run into trouble if a function is prototyped, a
3311 * global var is decled, then the function is defined with usage of
3312 * the global var. See glslparsertest's CorrectModule.frag.
3314 instructions
->push_head(var
);
3317 instructions
->append_list(&initializer_instructions
);
3321 /* Generally, variable declarations do not have r-values. However,
3322 * one is used for the declaration in
3324 * while (bool b = some_condition()) {
3328 * so we return the rvalue from the last seen declaration here.
3335 ast_parameter_declarator::hir(exec_list
*instructions
,
3336 struct _mesa_glsl_parse_state
*state
)
3339 const struct glsl_type
*type
;
3340 const char *name
= NULL
;
3341 YYLTYPE loc
= this->get_location();
3343 type
= this->type
->glsl_type(& name
, state
);
3347 _mesa_glsl_error(& loc
, state
,
3348 "invalid type `%s' in declaration of `%s'",
3349 name
, this->identifier
);
3351 _mesa_glsl_error(& loc
, state
,
3352 "invalid type in declaration of `%s'",
3356 type
= glsl_type::error_type
;
3359 /* From page 62 (page 68 of the PDF) of the GLSL 1.50 spec:
3361 * "Functions that accept no input arguments need not use void in the
3362 * argument list because prototypes (or definitions) are required and
3363 * therefore there is no ambiguity when an empty argument list "( )" is
3364 * declared. The idiom "(void)" as a parameter list is provided for
3367 * Placing this check here prevents a void parameter being set up
3368 * for a function, which avoids tripping up checks for main taking
3369 * parameters and lookups of an unnamed symbol.
3371 if (type
->is_void()) {
3372 if (this->identifier
!= NULL
)
3373 _mesa_glsl_error(& loc
, state
,
3374 "named parameter cannot have type `void'");
3380 if (formal_parameter
&& (this->identifier
== NULL
)) {
3381 _mesa_glsl_error(& loc
, state
, "formal parameter lacks a name");
3385 /* This only handles "vec4 foo[..]". The earlier specifier->glsl_type(...)
3386 * call already handled the "vec4[..] foo" case.
3388 if (this->is_array
) {
3389 type
= process_array_type(&loc
, type
, this->array_size
, state
);
3392 if (!type
->is_error() && type
->array_size() == 0) {
3393 _mesa_glsl_error(&loc
, state
, "arrays passed as parameters must have "
3395 type
= glsl_type::error_type
;
3399 ir_variable
*var
= new(ctx
)
3400 ir_variable(type
, this->identifier
, ir_var_function_in
);
3402 /* Apply any specified qualifiers to the parameter declaration. Note that
3403 * for function parameters the default mode is 'in'.
3405 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
, & loc
,
3408 /* From page 17 (page 23 of the PDF) of the GLSL 1.20 spec:
3410 * "Samplers cannot be treated as l-values; hence cannot be used
3411 * as out or inout function parameters, nor can they be assigned
3414 if ((var
->mode
== ir_var_function_inout
|| var
->mode
== ir_var_function_out
)
3415 && type
->contains_sampler()) {
3416 _mesa_glsl_error(&loc
, state
, "out and inout parameters cannot contain samplers");
3417 type
= glsl_type::error_type
;
3420 /* From page 39 (page 45 of the PDF) of the GLSL 1.10 spec:
3422 * "When calling a function, expressions that do not evaluate to
3423 * l-values cannot be passed to parameters declared as out or inout."
3425 * From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
3427 * "Other binary or unary expressions, non-dereferenced arrays,
3428 * function names, swizzles with repeated fields, and constants
3429 * cannot be l-values."
3431 * So for GLSL 1.10, passing an array as an out or inout parameter is not
3432 * allowed. This restriction is removed in GLSL 1.20, and in GLSL ES.
3434 if ((var
->mode
== ir_var_function_inout
|| var
->mode
== ir_var_function_out
)
3436 && !state
->check_version(120, 100, &loc
,
3437 "arrays cannot be out or inout parameters")) {
3438 type
= glsl_type::error_type
;
3441 instructions
->push_tail(var
);
3443 /* Parameter declarations do not have r-values.
3450 ast_parameter_declarator::parameters_to_hir(exec_list
*ast_parameters
,
3452 exec_list
*ir_parameters
,
3453 _mesa_glsl_parse_state
*state
)
3455 ast_parameter_declarator
*void_param
= NULL
;
3458 foreach_list_typed (ast_parameter_declarator
, param
, link
, ast_parameters
) {
3459 param
->formal_parameter
= formal
;
3460 param
->hir(ir_parameters
, state
);
3468 if ((void_param
!= NULL
) && (count
> 1)) {
3469 YYLTYPE loc
= void_param
->get_location();
3471 _mesa_glsl_error(& loc
, state
,
3472 "`void' parameter must be only parameter");
3478 emit_function(_mesa_glsl_parse_state
*state
, ir_function
*f
)
3480 /* IR invariants disallow function declarations or definitions
3481 * nested within other function definitions. But there is no
3482 * requirement about the relative order of function declarations
3483 * and definitions with respect to one another. So simply insert
3484 * the new ir_function block at the end of the toplevel instruction
3487 state
->toplevel_ir
->push_tail(f
);
3492 ast_function::hir(exec_list
*instructions
,
3493 struct _mesa_glsl_parse_state
*state
)
3496 ir_function
*f
= NULL
;
3497 ir_function_signature
*sig
= NULL
;
3498 exec_list hir_parameters
;
3500 const char *const name
= identifier
;
3502 /* New functions are always added to the top-level IR instruction stream,
3503 * so this instruction list pointer is ignored. See also emit_function
3506 (void) instructions
;
3508 /* From page 21 (page 27 of the PDF) of the GLSL 1.20 spec,
3510 * "Function declarations (prototypes) cannot occur inside of functions;
3511 * they must be at global scope, or for the built-in functions, outside
3512 * the global scope."
3514 * From page 27 (page 33 of the PDF) of the GLSL ES 1.00.16 spec,
3516 * "User defined functions may only be defined within the global scope."
3518 * Note that this language does not appear in GLSL 1.10.
3520 if ((state
->current_function
!= NULL
) &&
3521 state
->is_version(120, 100)) {
3522 YYLTYPE loc
= this->get_location();
3523 _mesa_glsl_error(&loc
, state
,
3524 "declaration of function `%s' not allowed within "
3525 "function body", name
);
3528 validate_identifier(name
, this->get_location(), state
);
3530 /* Convert the list of function parameters to HIR now so that they can be
3531 * used below to compare this function's signature with previously seen
3532 * signatures for functions with the same name.
3534 ast_parameter_declarator::parameters_to_hir(& this->parameters
,
3536 & hir_parameters
, state
);
3538 const char *return_type_name
;
3539 const glsl_type
*return_type
=
3540 this->return_type
->glsl_type(& return_type_name
, state
);
3543 YYLTYPE loc
= this->get_location();
3544 _mesa_glsl_error(&loc
, state
,
3545 "function `%s' has undeclared return type `%s'",
3546 name
, return_type_name
);
3547 return_type
= glsl_type::error_type
;
3550 /* From page 56 (page 62 of the PDF) of the GLSL 1.30 spec:
3551 * "No qualifier is allowed on the return type of a function."
3553 if (this->return_type
->has_qualifiers()) {
3554 YYLTYPE loc
= this->get_location();
3555 _mesa_glsl_error(& loc
, state
,
3556 "function `%s' return type has qualifiers", name
);
3559 /* Section 6.1 (Function Definitions) of the GLSL 1.20 spec says:
3561 * "Arrays are allowed as arguments and as the return type. In both
3562 * cases, the array must be explicitly sized."
3564 if (return_type
->is_array() && return_type
->length
== 0) {
3565 YYLTYPE loc
= this->get_location();
3566 _mesa_glsl_error(& loc
, state
,
3567 "function `%s' return type array must be explicitly "
3571 /* From page 17 (page 23 of the PDF) of the GLSL 1.20 spec:
3573 * "[Sampler types] can only be declared as function parameters
3574 * or uniform variables (see Section 4.3.5 "Uniform")".
3576 if (return_type
->contains_sampler()) {
3577 YYLTYPE loc
= this->get_location();
3578 _mesa_glsl_error(&loc
, state
,
3579 "function `%s' return type can't contain a sampler",
3583 /* Verify that this function's signature either doesn't match a previously
3584 * seen signature for a function with the same name, or, if a match is found,
3585 * that the previously seen signature does not have an associated definition.
3587 f
= state
->symbols
->get_function(name
);
3588 if (f
!= NULL
&& (state
->es_shader
|| f
->has_user_signature())) {
3589 sig
= f
->exact_matching_signature(state
, &hir_parameters
);
3591 const char *badvar
= sig
->qualifiers_match(&hir_parameters
);
3592 if (badvar
!= NULL
) {
3593 YYLTYPE loc
= this->get_location();
3595 _mesa_glsl_error(&loc
, state
, "function `%s' parameter `%s' "
3596 "qualifiers don't match prototype", name
, badvar
);
3599 if (sig
->return_type
!= return_type
) {
3600 YYLTYPE loc
= this->get_location();
3602 _mesa_glsl_error(&loc
, state
, "function `%s' return type doesn't "
3603 "match prototype", name
);
3606 if (sig
->is_defined
) {
3607 if (is_definition
) {
3608 YYLTYPE loc
= this->get_location();
3609 _mesa_glsl_error(& loc
, state
, "function `%s' redefined", name
);
3611 /* We just encountered a prototype that exactly matches a
3612 * function that's already been defined. This is redundant,
3613 * and we should ignore it.
3620 f
= new(ctx
) ir_function(name
);
3621 if (!state
->symbols
->add_function(f
)) {
3622 /* This function name shadows a non-function use of the same name. */
3623 YYLTYPE loc
= this->get_location();
3625 _mesa_glsl_error(&loc
, state
, "function name `%s' conflicts with "
3626 "non-function", name
);
3630 emit_function(state
, f
);
3633 /* Verify the return type of main() */
3634 if (strcmp(name
, "main") == 0) {
3635 if (! return_type
->is_void()) {
3636 YYLTYPE loc
= this->get_location();
3638 _mesa_glsl_error(& loc
, state
, "main() must return void");
3641 if (!hir_parameters
.is_empty()) {
3642 YYLTYPE loc
= this->get_location();
3644 _mesa_glsl_error(& loc
, state
, "main() must not take any parameters");
3648 /* Finish storing the information about this new function in its signature.
3651 sig
= new(ctx
) ir_function_signature(return_type
);
3652 f
->add_signature(sig
);
3655 sig
->replace_parameters(&hir_parameters
);
3658 /* Function declarations (prototypes) do not have r-values.
3665 ast_function_definition::hir(exec_list
*instructions
,
3666 struct _mesa_glsl_parse_state
*state
)
3668 prototype
->is_definition
= true;
3669 prototype
->hir(instructions
, state
);
3671 ir_function_signature
*signature
= prototype
->signature
;
3672 if (signature
== NULL
)
3675 assert(state
->current_function
== NULL
);
3676 state
->current_function
= signature
;
3677 state
->found_return
= false;
3679 /* Duplicate parameters declared in the prototype as concrete variables.
3680 * Add these to the symbol table.
3682 state
->symbols
->push_scope();
3683 foreach_iter(exec_list_iterator
, iter
, signature
->parameters
) {
3684 ir_variable
*const var
= ((ir_instruction
*) iter
.get())->as_variable();
3686 assert(var
!= NULL
);
3688 /* The only way a parameter would "exist" is if two parameters have
3691 if (state
->symbols
->name_declared_this_scope(var
->name
)) {
3692 YYLTYPE loc
= this->get_location();
3694 _mesa_glsl_error(& loc
, state
, "parameter `%s' redeclared", var
->name
);
3696 state
->symbols
->add_variable(var
);
3700 /* Convert the body of the function to HIR. */
3701 this->body
->hir(&signature
->body
, state
);
3702 signature
->is_defined
= true;
3704 state
->symbols
->pop_scope();
3706 assert(state
->current_function
== signature
);
3707 state
->current_function
= NULL
;
3709 if (!signature
->return_type
->is_void() && !state
->found_return
) {
3710 YYLTYPE loc
= this->get_location();
3711 _mesa_glsl_error(& loc
, state
, "function `%s' has non-void return type "
3712 "%s, but no return statement",
3713 signature
->function_name(),
3714 signature
->return_type
->name
);
3717 /* Function definitions do not have r-values.
3724 ast_jump_statement::hir(exec_list
*instructions
,
3725 struct _mesa_glsl_parse_state
*state
)
3732 assert(state
->current_function
);
3734 if (opt_return_value
) {
3735 ir_rvalue
*ret
= opt_return_value
->hir(instructions
, state
);
3737 /* The value of the return type can be NULL if the shader says
3738 * 'return foo();' and foo() is a function that returns void.
3740 * NOTE: The GLSL spec doesn't say that this is an error. The type
3741 * of the return value is void. If the return type of the function is
3742 * also void, then this should compile without error. Seriously.
3744 const glsl_type
*const ret_type
=
3745 (ret
== NULL
) ? glsl_type::void_type
: ret
->type
;
3747 /* Implicit conversions are not allowed for return values prior to
3748 * ARB_shading_language_420pack.
3750 if (state
->current_function
->return_type
!= ret_type
) {
3751 YYLTYPE loc
= this->get_location();
3753 if (state
->ARB_shading_language_420pack_enable
) {
3754 if (!apply_implicit_conversion(state
->current_function
->return_type
,
3756 _mesa_glsl_error(& loc
, state
,
3757 "could not implicitly convert return value "
3758 "to %s, in function `%s'",
3759 state
->current_function
->return_type
->name
,
3760 state
->current_function
->function_name());
3763 _mesa_glsl_error(& loc
, state
,
3764 "`return' with wrong type %s, in function `%s' "
3767 state
->current_function
->function_name(),
3768 state
->current_function
->return_type
->name
);
3770 } else if (state
->current_function
->return_type
->base_type
==
3772 YYLTYPE loc
= this->get_location();
3774 /* The ARB_shading_language_420pack, GLSL ES 3.0, and GLSL 4.20
3775 * specs add a clarification:
3777 * "A void function can only use return without a return argument, even if
3778 * the return argument has void type. Return statements only accept values:
3781 * void func2() { return func1(); } // illegal return statement"
3783 _mesa_glsl_error(& loc
, state
,
3784 "void functions can only use `return' without a "
3788 inst
= new(ctx
) ir_return(ret
);
3790 if (state
->current_function
->return_type
->base_type
!=
3792 YYLTYPE loc
= this->get_location();
3794 _mesa_glsl_error(& loc
, state
,
3795 "`return' with no value, in function %s returning "
3797 state
->current_function
->function_name());
3799 inst
= new(ctx
) ir_return
;
3802 state
->found_return
= true;
3803 instructions
->push_tail(inst
);
3808 if (state
->target
!= fragment_shader
) {
3809 YYLTYPE loc
= this->get_location();
3811 _mesa_glsl_error(& loc
, state
,
3812 "`discard' may only appear in a fragment shader");
3814 instructions
->push_tail(new(ctx
) ir_discard
);
3819 if (mode
== ast_continue
&&
3820 state
->loop_nesting_ast
== NULL
) {
3821 YYLTYPE loc
= this->get_location();
3823 _mesa_glsl_error(& loc
, state
,
3824 "continue may only appear in a loop");
3825 } else if (mode
== ast_break
&&
3826 state
->loop_nesting_ast
== NULL
&&
3827 state
->switch_state
.switch_nesting_ast
== NULL
) {
3828 YYLTYPE loc
= this->get_location();
3830 _mesa_glsl_error(& loc
, state
,
3831 "break may only appear in a loop or a switch");
3833 /* For a loop, inline the for loop expression again,
3834 * since we don't know where near the end of
3835 * the loop body the normal copy of it
3836 * is going to be placed.
3838 if (state
->loop_nesting_ast
!= NULL
&&
3839 mode
== ast_continue
&&
3840 state
->loop_nesting_ast
->rest_expression
) {
3841 state
->loop_nesting_ast
->rest_expression
->hir(instructions
,
3845 if (state
->switch_state
.is_switch_innermost
&&
3846 mode
== ast_break
) {
3847 /* Force break out of switch by setting is_break switch state.
3849 ir_variable
*const is_break_var
= state
->switch_state
.is_break_var
;
3850 ir_dereference_variable
*const deref_is_break_var
=
3851 new(ctx
) ir_dereference_variable(is_break_var
);
3852 ir_constant
*const true_val
= new(ctx
) ir_constant(true);
3853 ir_assignment
*const set_break_var
=
3854 new(ctx
) ir_assignment(deref_is_break_var
, true_val
);
3856 instructions
->push_tail(set_break_var
);
3859 ir_loop_jump
*const jump
=
3860 new(ctx
) ir_loop_jump((mode
== ast_break
)
3861 ? ir_loop_jump::jump_break
3862 : ir_loop_jump::jump_continue
);
3863 instructions
->push_tail(jump
);
3870 /* Jump instructions do not have r-values.
3877 ast_selection_statement::hir(exec_list
*instructions
,
3878 struct _mesa_glsl_parse_state
*state
)
3882 ir_rvalue
*const condition
= this->condition
->hir(instructions
, state
);
3884 /* From page 66 (page 72 of the PDF) of the GLSL 1.50 spec:
3886 * "Any expression whose type evaluates to a Boolean can be used as the
3887 * conditional expression bool-expression. Vector types are not accepted
3888 * as the expression to if."
3890 * The checks are separated so that higher quality diagnostics can be
3891 * generated for cases where both rules are violated.
3893 if (!condition
->type
->is_boolean() || !condition
->type
->is_scalar()) {
3894 YYLTYPE loc
= this->condition
->get_location();
3896 _mesa_glsl_error(& loc
, state
, "if-statement condition must be scalar "
3900 ir_if
*const stmt
= new(ctx
) ir_if(condition
);
3902 if (then_statement
!= NULL
) {
3903 state
->symbols
->push_scope();
3904 then_statement
->hir(& stmt
->then_instructions
, state
);
3905 state
->symbols
->pop_scope();
3908 if (else_statement
!= NULL
) {
3909 state
->symbols
->push_scope();
3910 else_statement
->hir(& stmt
->else_instructions
, state
);
3911 state
->symbols
->pop_scope();
3914 instructions
->push_tail(stmt
);
3916 /* if-statements do not have r-values.
3923 ast_switch_statement::hir(exec_list
*instructions
,
3924 struct _mesa_glsl_parse_state
*state
)
3928 ir_rvalue
*const test_expression
=
3929 this->test_expression
->hir(instructions
, state
);
3931 /* From page 66 (page 55 of the PDF) of the GLSL 1.50 spec:
3933 * "The type of init-expression in a switch statement must be a
3936 if (!test_expression
->type
->is_scalar() ||
3937 !test_expression
->type
->is_integer()) {
3938 YYLTYPE loc
= this->test_expression
->get_location();
3940 _mesa_glsl_error(& loc
,
3942 "switch-statement expression must be scalar "
3946 /* Track the switch-statement nesting in a stack-like manner.
3948 struct glsl_switch_state saved
= state
->switch_state
;
3950 state
->switch_state
.is_switch_innermost
= true;
3951 state
->switch_state
.switch_nesting_ast
= this;
3952 state
->switch_state
.labels_ht
= hash_table_ctor(0, hash_table_pointer_hash
,
3953 hash_table_pointer_compare
);
3954 state
->switch_state
.previous_default
= NULL
;
3956 /* Initalize is_fallthru state to false.
3958 ir_rvalue
*const is_fallthru_val
= new (ctx
) ir_constant(false);
3959 state
->switch_state
.is_fallthru_var
=
3960 new(ctx
) ir_variable(glsl_type::bool_type
,
3961 "switch_is_fallthru_tmp",
3963 instructions
->push_tail(state
->switch_state
.is_fallthru_var
);
3965 ir_dereference_variable
*deref_is_fallthru_var
=
3966 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
3967 instructions
->push_tail(new(ctx
) ir_assignment(deref_is_fallthru_var
,
3970 /* Initalize is_break state to false.
3972 ir_rvalue
*const is_break_val
= new (ctx
) ir_constant(false);
3973 state
->switch_state
.is_break_var
= new(ctx
) ir_variable(glsl_type::bool_type
,
3974 "switch_is_break_tmp",
3976 instructions
->push_tail(state
->switch_state
.is_break_var
);
3978 ir_dereference_variable
*deref_is_break_var
=
3979 new(ctx
) ir_dereference_variable(state
->switch_state
.is_break_var
);
3980 instructions
->push_tail(new(ctx
) ir_assignment(deref_is_break_var
,
3983 /* Cache test expression.
3985 test_to_hir(instructions
, state
);
3987 /* Emit code for body of switch stmt.
3989 body
->hir(instructions
, state
);
3991 hash_table_dtor(state
->switch_state
.labels_ht
);
3993 state
->switch_state
= saved
;
3995 /* Switch statements do not have r-values. */
4001 ast_switch_statement::test_to_hir(exec_list
*instructions
,
4002 struct _mesa_glsl_parse_state
*state
)
4006 /* Cache value of test expression. */
4007 ir_rvalue
*const test_val
=
4008 test_expression
->hir(instructions
,
4011 state
->switch_state
.test_var
= new(ctx
) ir_variable(test_val
->type
,
4014 ir_dereference_variable
*deref_test_var
=
4015 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
4017 instructions
->push_tail(state
->switch_state
.test_var
);
4018 instructions
->push_tail(new(ctx
) ir_assignment(deref_test_var
, test_val
));
4023 ast_switch_body::hir(exec_list
*instructions
,
4024 struct _mesa_glsl_parse_state
*state
)
4027 stmts
->hir(instructions
, state
);
4029 /* Switch bodies do not have r-values. */
4034 ast_case_statement_list::hir(exec_list
*instructions
,
4035 struct _mesa_glsl_parse_state
*state
)
4037 foreach_list_typed (ast_case_statement
, case_stmt
, link
, & this->cases
)
4038 case_stmt
->hir(instructions
, state
);
4040 /* Case statements do not have r-values. */
4045 ast_case_statement::hir(exec_list
*instructions
,
4046 struct _mesa_glsl_parse_state
*state
)
4048 labels
->hir(instructions
, state
);
4050 /* Conditionally set fallthru state based on break state. */
4051 ir_constant
*const false_val
= new(state
) ir_constant(false);
4052 ir_dereference_variable
*const deref_is_fallthru_var
=
4053 new(state
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
4054 ir_dereference_variable
*const deref_is_break_var
=
4055 new(state
) ir_dereference_variable(state
->switch_state
.is_break_var
);
4056 ir_assignment
*const reset_fallthru_on_break
=
4057 new(state
) ir_assignment(deref_is_fallthru_var
,
4059 deref_is_break_var
);
4060 instructions
->push_tail(reset_fallthru_on_break
);
4062 /* Guard case statements depending on fallthru state. */
4063 ir_dereference_variable
*const deref_fallthru_guard
=
4064 new(state
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
4065 ir_if
*const test_fallthru
= new(state
) ir_if(deref_fallthru_guard
);
4067 foreach_list_typed (ast_node
, stmt
, link
, & this->stmts
)
4068 stmt
->hir(& test_fallthru
->then_instructions
, state
);
4070 instructions
->push_tail(test_fallthru
);
4072 /* Case statements do not have r-values. */
4078 ast_case_label_list::hir(exec_list
*instructions
,
4079 struct _mesa_glsl_parse_state
*state
)
4081 foreach_list_typed (ast_case_label
, label
, link
, & this->labels
)
4082 label
->hir(instructions
, state
);
4084 /* Case labels do not have r-values. */
4089 ast_case_label::hir(exec_list
*instructions
,
4090 struct _mesa_glsl_parse_state
*state
)
4094 ir_dereference_variable
*deref_fallthru_var
=
4095 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
4097 ir_rvalue
*const true_val
= new(ctx
) ir_constant(true);
4099 /* If not default case, ... */
4100 if (this->test_value
!= NULL
) {
4101 /* Conditionally set fallthru state based on
4102 * comparison of cached test expression value to case label.
4104 ir_rvalue
*const label_rval
= this->test_value
->hir(instructions
, state
);
4105 ir_constant
*label_const
= label_rval
->constant_expression_value();
4108 YYLTYPE loc
= this->test_value
->get_location();
4110 _mesa_glsl_error(& loc
, state
,
4111 "switch statement case label must be a "
4112 "constant expression");
4114 /* Stuff a dummy value in to allow processing to continue. */
4115 label_const
= new(ctx
) ir_constant(0);
4117 ast_expression
*previous_label
= (ast_expression
*)
4118 hash_table_find(state
->switch_state
.labels_ht
,
4119 (void *)(uintptr_t)label_const
->value
.u
[0]);
4121 if (previous_label
) {
4122 YYLTYPE loc
= this->test_value
->get_location();
4123 _mesa_glsl_error(& loc
, state
,
4124 "duplicate case value");
4126 loc
= previous_label
->get_location();
4127 _mesa_glsl_error(& loc
, state
,
4128 "this is the previous case label");
4130 hash_table_insert(state
->switch_state
.labels_ht
,
4132 (void *)(uintptr_t)label_const
->value
.u
[0]);
4136 ir_dereference_variable
*deref_test_var
=
4137 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
4139 ir_rvalue
*const test_cond
= new(ctx
) ir_expression(ir_binop_all_equal
,
4143 ir_assignment
*set_fallthru_on_test
=
4144 new(ctx
) ir_assignment(deref_fallthru_var
,
4148 instructions
->push_tail(set_fallthru_on_test
);
4149 } else { /* default case */
4150 if (state
->switch_state
.previous_default
) {
4151 YYLTYPE loc
= this->get_location();
4152 _mesa_glsl_error(& loc
, state
,
4153 "multiple default labels in one switch");
4155 loc
= state
->switch_state
.previous_default
->get_location();
4156 _mesa_glsl_error(& loc
, state
,
4157 "this is the first default label");
4159 state
->switch_state
.previous_default
= this;
4161 /* Set falltrhu state. */
4162 ir_assignment
*set_fallthru
=
4163 new(ctx
) ir_assignment(deref_fallthru_var
, true_val
);
4165 instructions
->push_tail(set_fallthru
);
4168 /* Case statements do not have r-values. */
4173 ast_iteration_statement::condition_to_hir(ir_loop
*stmt
,
4174 struct _mesa_glsl_parse_state
*state
)
4178 if (condition
!= NULL
) {
4179 ir_rvalue
*const cond
=
4180 condition
->hir(& stmt
->body_instructions
, state
);
4183 || !cond
->type
->is_boolean() || !cond
->type
->is_scalar()) {
4184 YYLTYPE loc
= condition
->get_location();
4186 _mesa_glsl_error(& loc
, state
,
4187 "loop condition must be scalar boolean");
4189 /* As the first code in the loop body, generate a block that looks
4190 * like 'if (!condition) break;' as the loop termination condition.
4192 ir_rvalue
*const not_cond
=
4193 new(ctx
) ir_expression(ir_unop_logic_not
, cond
);
4195 ir_if
*const if_stmt
= new(ctx
) ir_if(not_cond
);
4197 ir_jump
*const break_stmt
=
4198 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
4200 if_stmt
->then_instructions
.push_tail(break_stmt
);
4201 stmt
->body_instructions
.push_tail(if_stmt
);
4208 ast_iteration_statement::hir(exec_list
*instructions
,
4209 struct _mesa_glsl_parse_state
*state
)
4213 /* For-loops and while-loops start a new scope, but do-while loops do not.
4215 if (mode
!= ast_do_while
)
4216 state
->symbols
->push_scope();
4218 if (init_statement
!= NULL
)
4219 init_statement
->hir(instructions
, state
);
4221 ir_loop
*const stmt
= new(ctx
) ir_loop();
4222 instructions
->push_tail(stmt
);
4224 /* Track the current loop nesting. */
4225 ast_iteration_statement
*nesting_ast
= state
->loop_nesting_ast
;
4227 state
->loop_nesting_ast
= this;
4229 /* Likewise, indicate that following code is closest to a loop,
4230 * NOT closest to a switch.
4232 bool saved_is_switch_innermost
= state
->switch_state
.is_switch_innermost
;
4233 state
->switch_state
.is_switch_innermost
= false;
4235 if (mode
!= ast_do_while
)
4236 condition_to_hir(stmt
, state
);
4239 body
->hir(& stmt
->body_instructions
, state
);
4241 if (rest_expression
!= NULL
)
4242 rest_expression
->hir(& stmt
->body_instructions
, state
);
4244 if (mode
== ast_do_while
)
4245 condition_to_hir(stmt
, state
);
4247 if (mode
!= ast_do_while
)
4248 state
->symbols
->pop_scope();
4250 /* Restore previous nesting before returning. */
4251 state
->loop_nesting_ast
= nesting_ast
;
4252 state
->switch_state
.is_switch_innermost
= saved_is_switch_innermost
;
4254 /* Loops do not have r-values.
4261 * Determine if the given type is valid for establishing a default precision
4264 * From GLSL ES 3.00 section 4.5.4 ("Default Precision Qualifiers"):
4266 * "The precision statement
4268 * precision precision-qualifier type;
4270 * can be used to establish a default precision qualifier. The type field
4271 * can be either int or float or any of the sampler types, and the
4272 * precision-qualifier can be lowp, mediump, or highp."
4274 * GLSL ES 1.00 has similar language. GLSL 1.30 doesn't allow precision
4275 * qualifiers on sampler types, but this seems like an oversight (since the
4276 * intention of including these in GLSL 1.30 is to allow compatibility with ES
4277 * shaders). So we allow int, float, and all sampler types regardless of GLSL
4281 is_valid_default_precision_type(const struct glsl_type
*const type
)
4286 switch (type
->base_type
) {
4288 case GLSL_TYPE_FLOAT
:
4289 /* "int" and "float" are valid, but vectors and matrices are not. */
4290 return type
->vector_elements
== 1 && type
->matrix_columns
== 1;
4291 case GLSL_TYPE_SAMPLER
:
4300 ast_type_specifier::hir(exec_list
*instructions
,
4301 struct _mesa_glsl_parse_state
*state
)
4303 if (this->default_precision
== ast_precision_none
&& this->structure
== NULL
)
4306 YYLTYPE loc
= this->get_location();
4308 /* If this is a precision statement, check that the type to which it is
4309 * applied is either float or int.
4311 * From section 4.5.3 of the GLSL 1.30 spec:
4312 * "The precision statement
4313 * precision precision-qualifier type;
4314 * can be used to establish a default precision qualifier. The type
4315 * field can be either int or float [...]. Any other types or
4316 * qualifiers will result in an error.
4318 if (this->default_precision
!= ast_precision_none
) {
4319 if (!state
->check_precision_qualifiers_allowed(&loc
))
4322 if (this->structure
!= NULL
) {
4323 _mesa_glsl_error(&loc
, state
,
4324 "precision qualifiers do not apply to structures");
4328 if (this->is_array
) {
4329 _mesa_glsl_error(&loc
, state
,
4330 "default precision statements do not apply to "
4335 const struct glsl_type
*const type
=
4336 state
->symbols
->get_type(this->type_name
);
4337 if (!is_valid_default_precision_type(type
)) {
4338 _mesa_glsl_error(&loc
, state
,
4339 "default precision statements apply only to "
4340 "float, int, and sampler types");
4344 if (type
->base_type
== GLSL_TYPE_FLOAT
4346 && state
->target
== fragment_shader
) {
4347 /* Section 4.5.3 (Default Precision Qualifiers) of the GLSL ES 1.00
4350 * "The fragment language has no default precision qualifier for
4351 * floating point types."
4353 * As a result, we have to track whether or not default precision has
4354 * been specified for float in GLSL ES fragment shaders.
4356 * Earlier in that same section, the spec says:
4358 * "Non-precision qualified declarations will use the precision
4359 * qualifier specified in the most recent precision statement
4360 * that is still in scope. The precision statement has the same
4361 * scoping rules as variable declarations. If it is declared
4362 * inside a compound statement, its effect stops at the end of
4363 * the innermost statement it was declared in. Precision
4364 * statements in nested scopes override precision statements in
4365 * outer scopes. Multiple precision statements for the same basic
4366 * type can appear inside the same scope, with later statements
4367 * overriding earlier statements within that scope."
4369 * Default precision specifications follow the same scope rules as
4370 * variables. So, we can track the state of the default float
4371 * precision in the symbol table, and the rules will just work. This
4372 * is a slight abuse of the symbol table, but it has the semantics
4375 ir_variable
*const junk
=
4376 new(state
) ir_variable(type
, "#default precision",
4379 state
->symbols
->add_variable(junk
);
4382 /* FINISHME: Translate precision statements into IR. */
4386 /* _mesa_ast_set_aggregate_type() sets the <structure> field so that
4387 * process_record_constructor() can do type-checking on C-style initializer
4388 * expressions of structs, but ast_struct_specifier should only be translated
4389 * to HIR if it is declaring the type of a structure.
4391 * The ->is_declaration field is false for initializers of variables
4392 * declared separately from the struct's type definition.
4394 * struct S { ... }; (is_declaration = true)
4395 * struct T { ... } t = { ... }; (is_declaration = true)
4396 * S s = { ... }; (is_declaration = false)
4398 if (this->structure
!= NULL
&& this->structure
->is_declaration
)
4399 return this->structure
->hir(instructions
, state
);
4406 * Process a structure or interface block tree into an array of structure fields
4408 * After parsing, where there are some syntax differnces, structures and
4409 * interface blocks are almost identical. They are similar enough that the
4410 * AST for each can be processed the same way into a set of
4411 * \c glsl_struct_field to describe the members.
4414 * The number of fields processed. A pointer to the array structure fields is
4415 * stored in \c *fields_ret.
4418 ast_process_structure_or_interface_block(exec_list
*instructions
,
4419 struct _mesa_glsl_parse_state
*state
,
4420 exec_list
*declarations
,
4422 glsl_struct_field
**fields_ret
,
4424 bool block_row_major
,
4425 bool allow_reserved_names
)
4427 unsigned decl_count
= 0;
4429 /* Make an initial pass over the list of fields to determine how
4430 * many there are. Each element in this list is an ast_declarator_list.
4431 * This means that we actually need to count the number of elements in the
4432 * 'declarations' list in each of the elements.
4434 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
4435 foreach_list_const (decl_ptr
, & decl_list
->declarations
) {
4440 /* Allocate storage for the fields and process the field
4441 * declarations. As the declarations are processed, try to also convert
4442 * the types to HIR. This ensures that structure definitions embedded in
4443 * other structure definitions or in interface blocks are processed.
4445 glsl_struct_field
*const fields
= ralloc_array(state
, glsl_struct_field
,
4449 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
4450 const char *type_name
;
4452 decl_list
->type
->specifier
->hir(instructions
, state
);
4454 /* Section 10.9 of the GLSL ES 1.00 specification states that
4455 * embedded structure definitions have been removed from the language.
4457 if (state
->es_shader
&& decl_list
->type
->specifier
->structure
!= NULL
) {
4458 _mesa_glsl_error(&loc
, state
, "embedded structure definitions are "
4459 "not allowed in GLSL ES 1.00");
4462 const glsl_type
*decl_type
=
4463 decl_list
->type
->glsl_type(& type_name
, state
);
4465 foreach_list_typed (ast_declaration
, decl
, link
,
4466 &decl_list
->declarations
) {
4467 if (!allow_reserved_names
)
4468 validate_identifier(decl
->identifier
, loc
, state
);
4470 /* From the GL_ARB_uniform_buffer_object spec:
4472 * "Sampler types are not allowed inside of uniform
4473 * blocks. All other types, arrays, and structures
4474 * allowed for uniforms are allowed within a uniform
4477 * It should be impossible for decl_type to be NULL here. Cases that
4478 * might naturally lead to decl_type being NULL, especially for the
4479 * is_interface case, will have resulted in compilation having
4480 * already halted due to a syntax error.
4482 const struct glsl_type
*field_type
=
4483 decl_type
!= NULL
? decl_type
: glsl_type::error_type
;
4485 if (is_interface
&& field_type
->contains_sampler()) {
4486 YYLTYPE loc
= decl_list
->get_location();
4487 _mesa_glsl_error(&loc
, state
,
4488 "uniform in non-default uniform block contains sampler");
4491 const struct ast_type_qualifier
*const qual
=
4492 & decl_list
->type
->qualifier
;
4493 if (qual
->flags
.q
.std140
||
4494 qual
->flags
.q
.packed
||
4495 qual
->flags
.q
.shared
) {
4496 _mesa_glsl_error(&loc
, state
,
4497 "uniform block layout qualifiers std140, packed, and "
4498 "shared can only be applied to uniform blocks, not "
4502 if (decl
->is_array
) {
4503 field_type
= process_array_type(&loc
, decl_type
, decl
->array_size
,
4506 fields
[i
].type
= field_type
;
4507 fields
[i
].name
= decl
->identifier
;
4508 fields
[i
].location
= -1;
4510 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
4511 if (!qual
->flags
.q
.uniform
) {
4512 _mesa_glsl_error(&loc
, state
,
4513 "row_major and column_major can only be "
4514 "applied to uniform interface blocks");
4516 validate_matrix_layout_for_type(state
, &loc
, field_type
, NULL
);
4519 if (qual
->flags
.q
.uniform
&& qual
->has_interpolation()) {
4520 _mesa_glsl_error(&loc
, state
,
4521 "interpolation qualifiers cannot be used "
4522 "with uniform interface blocks");
4525 if (field_type
->is_matrix() ||
4526 (field_type
->is_array() && field_type
->fields
.array
->is_matrix())) {
4527 fields
[i
].row_major
= block_row_major
;
4528 if (qual
->flags
.q
.row_major
)
4529 fields
[i
].row_major
= true;
4530 else if (qual
->flags
.q
.column_major
)
4531 fields
[i
].row_major
= false;
4538 assert(i
== decl_count
);
4540 *fields_ret
= fields
;
4546 ast_struct_specifier::hir(exec_list
*instructions
,
4547 struct _mesa_glsl_parse_state
*state
)
4549 YYLTYPE loc
= this->get_location();
4551 /* Section 4.1.8 (Structures) of the GLSL 1.10 spec says:
4553 * "Anonymous structures are not supported; so embedded structures must
4554 * have a declarator. A name given to an embedded struct is scoped at
4555 * the same level as the struct it is embedded in."
4557 * The same section of the GLSL 1.20 spec says:
4559 * "Anonymous structures are not supported. Embedded structures are not
4562 * struct S { float f; };
4564 * S; // Error: anonymous structures disallowed
4565 * struct { ... }; // Error: embedded structures disallowed
4566 * S s; // Okay: nested structures with name are allowed
4569 * The GLSL ES 1.00 and 3.00 specs have similar langauge and examples. So,
4570 * we allow embedded structures in 1.10 only.
4572 if (state
->language_version
!= 110 && state
->struct_specifier_depth
!= 0)
4573 _mesa_glsl_error(&loc
, state
,
4574 "embedded structure declartions are not allowed");
4576 state
->struct_specifier_depth
++;
4578 glsl_struct_field
*fields
;
4579 unsigned decl_count
=
4580 ast_process_structure_or_interface_block(instructions
,
4582 &this->declarations
,
4587 false /* allow_reserved_names */);
4589 validate_identifier(this->name
, loc
, state
);
4591 const glsl_type
*t
=
4592 glsl_type::get_record_instance(fields
, decl_count
, this->name
);
4594 if (!state
->symbols
->add_type(name
, t
)) {
4595 _mesa_glsl_error(& loc
, state
, "struct `%s' previously defined", name
);
4597 const glsl_type
**s
= reralloc(state
, state
->user_structures
,
4599 state
->num_user_structures
+ 1);
4601 s
[state
->num_user_structures
] = t
;
4602 state
->user_structures
= s
;
4603 state
->num_user_structures
++;
4607 state
->struct_specifier_depth
--;
4609 /* Structure type definitions do not have r-values.
4615 ast_interface_block::hir(exec_list
*instructions
,
4616 struct _mesa_glsl_parse_state
*state
)
4618 YYLTYPE loc
= this->get_location();
4620 /* The ast_interface_block has a list of ast_declarator_lists. We
4621 * need to turn those into ir_variables with an association
4622 * with this uniform block.
4624 enum glsl_interface_packing packing
;
4625 if (this->layout
.flags
.q
.shared
) {
4626 packing
= GLSL_INTERFACE_PACKING_SHARED
;
4627 } else if (this->layout
.flags
.q
.packed
) {
4628 packing
= GLSL_INTERFACE_PACKING_PACKED
;
4630 /* The default layout is std140.
4632 packing
= GLSL_INTERFACE_PACKING_STD140
;
4635 bool redeclaring_per_vertex
= strcmp(this->block_name
, "gl_PerVertex") == 0;
4636 bool block_row_major
= this->layout
.flags
.q
.row_major
;
4637 exec_list declared_variables
;
4638 glsl_struct_field
*fields
;
4639 unsigned int num_variables
=
4640 ast_process_structure_or_interface_block(&declared_variables
,
4642 &this->declarations
,
4647 redeclaring_per_vertex
);
4649 ir_variable_mode var_mode
;
4650 const char *iface_type_name
;
4651 if (this->layout
.flags
.q
.in
) {
4652 var_mode
= ir_var_shader_in
;
4653 iface_type_name
= "in";
4654 } else if (this->layout
.flags
.q
.out
) {
4655 var_mode
= ir_var_shader_out
;
4656 iface_type_name
= "out";
4657 } else if (this->layout
.flags
.q
.uniform
) {
4658 var_mode
= ir_var_uniform
;
4659 iface_type_name
= "uniform";
4661 var_mode
= ir_var_auto
;
4662 iface_type_name
= "UNKNOWN";
4663 assert(!"interface block layout qualifier not found!");
4666 if (!redeclaring_per_vertex
)
4667 validate_identifier(this->block_name
, loc
, state
);
4669 const glsl_type
*earlier_per_vertex
= NULL
;
4670 if (redeclaring_per_vertex
) {
4671 /* Find the previous declaration of gl_PerVertex. If we're redeclaring
4672 * the named interface block gl_in, we can find it by looking at the
4673 * previous declaration of gl_in. Otherwise we can find it by looking
4674 * at the previous decalartion of any of the built-in outputs,
4677 * Also check that the instance name and array-ness of the redeclaration
4681 case ir_var_shader_in
:
4682 if (ir_variable
*earlier_gl_in
=
4683 state
->symbols
->get_variable("gl_in")) {
4684 earlier_per_vertex
= earlier_gl_in
->get_interface_type();
4686 _mesa_glsl_error(&loc
, state
,
4687 "redeclaration of gl_PerVertex input not allowed "
4689 _mesa_glsl_shader_target_name(state
->target
));
4691 if (this->instance_name
== NULL
||
4692 strcmp(this->instance_name
, "gl_in") != 0 || !this->is_array
) {
4693 _mesa_glsl_error(&loc
, state
,
4694 "gl_PerVertex input must be redeclared as "
4698 case ir_var_shader_out
:
4699 if (ir_variable
*earlier_gl_Position
=
4700 state
->symbols
->get_variable("gl_Position")) {
4701 earlier_per_vertex
= earlier_gl_Position
->get_interface_type();
4703 _mesa_glsl_error(&loc
, state
,
4704 "redeclaration of gl_PerVertex output not "
4705 "allowed in the %s shader",
4706 _mesa_glsl_shader_target_name(state
->target
));
4708 if (this->instance_name
!= NULL
) {
4709 _mesa_glsl_error(&loc
, state
,
4710 "gl_PerVertex input may not be redeclared with "
4711 "an instance name");
4715 _mesa_glsl_error(&loc
, state
,
4716 "gl_PerVertex must be declared as an input or an "
4721 if (earlier_per_vertex
== NULL
) {
4722 /* An error has already been reported. Bail out to avoid null
4723 * dereferences later in this function.
4729 const glsl_type
*block_type
=
4730 glsl_type::get_interface_instance(fields
,
4735 if (!state
->symbols
->add_interface(block_type
->name
, block_type
, var_mode
)) {
4736 YYLTYPE loc
= this->get_location();
4737 _mesa_glsl_error(&loc
, state
, "interface block `%s' with type `%s' "
4738 "already taken in the current scope",
4739 this->block_name
, iface_type_name
);
4742 /* Since interface blocks cannot contain statements, it should be
4743 * impossible for the block to generate any instructions.
4745 assert(declared_variables
.is_empty());
4747 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
4749 * Geometry shader input variables get the per-vertex values written
4750 * out by vertex shader output variables of the same names. Since a
4751 * geometry shader operates on a set of vertices, each input varying
4752 * variable (or input block, see interface blocks below) needs to be
4753 * declared as an array.
4755 if (state
->target
== geometry_shader
&& !this->is_array
&&
4756 var_mode
== ir_var_shader_in
) {
4757 _mesa_glsl_error(&loc
, state
, "geometry shader inputs must be arrays");
4760 /* Page 39 (page 45 of the PDF) of section 4.3.7 in the GLSL ES 3.00 spec
4763 * "If an instance name (instance-name) is used, then it puts all the
4764 * members inside a scope within its own name space, accessed with the
4765 * field selector ( . ) operator (analogously to structures)."
4767 if (this->instance_name
) {
4768 if (!redeclaring_per_vertex
)
4769 validate_identifier(this->instance_name
, loc
, state
);
4773 if (this->is_array
) {
4774 /* Section 4.3.7 (Interface Blocks) of the GLSL 1.50 spec says:
4776 * For uniform blocks declared an array, each individual array
4777 * element corresponds to a separate buffer object backing one
4778 * instance of the block. As the array size indicates the number
4779 * of buffer objects needed, uniform block array declarations
4780 * must specify an array size.
4782 * And a few paragraphs later:
4784 * Geometry shader input blocks must be declared as arrays and
4785 * follow the array declaration and linking rules for all
4786 * geometry shader inputs. All other input and output block
4787 * arrays must specify an array size.
4789 * The upshot of this is that the only circumstance where an
4790 * interface array size *doesn't* need to be specified is on a
4791 * geometry shader input.
4793 if (this->array_size
== NULL
&&
4794 (state
->target
!= geometry_shader
|| !this->layout
.flags
.q
.in
)) {
4795 _mesa_glsl_error(&loc
, state
,
4796 "only geometry shader inputs may be unsized "
4797 "instance block arrays");
4801 const glsl_type
*block_array_type
=
4802 process_array_type(&loc
, block_type
, this->array_size
, state
);
4804 var
= new(state
) ir_variable(block_array_type
,
4805 this->instance_name
,
4808 var
= new(state
) ir_variable(block_type
,
4809 this->instance_name
,
4813 var
->init_interface_type(block_type
);
4814 if (state
->target
== geometry_shader
&& var_mode
== ir_var_shader_in
)
4815 handle_geometry_shader_input_decl(state
, loc
, var
);
4816 state
->symbols
->add_variable(var
);
4817 instructions
->push_tail(var
);
4819 /* In order to have an array size, the block must also be declared with
4822 assert(!this->is_array
);
4824 for (unsigned i
= 0; i
< num_variables
; i
++) {
4826 new(state
) ir_variable(fields
[i
].type
,
4827 ralloc_strdup(state
, fields
[i
].name
),
4829 var
->init_interface_type(block_type
);
4831 if (redeclaring_per_vertex
) {
4832 ir_variable
*earlier
=
4833 get_variable_being_redeclared(var
, loc
, state
,
4834 true /* allow_all_redeclarations */);
4835 if (strncmp(var
->name
, "gl_", 3) != 0 || earlier
== NULL
) {
4836 _mesa_glsl_error(&loc
, state
,
4837 "redeclaration of gl_PerVertex can only "
4838 "include built-in variables");
4840 earlier
->reinit_interface_type(block_type
);
4845 if (state
->symbols
->get_variable(var
->name
) != NULL
)
4846 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", var
->name
);
4848 /* Propagate the "binding" keyword into this UBO's fields;
4849 * the UBO declaration itself doesn't get an ir_variable unless it
4850 * has an instance name. This is ugly.
4852 var
->explicit_binding
= this->layout
.flags
.q
.explicit_binding
;
4853 var
->binding
= this->layout
.binding
;
4855 state
->symbols
->add_variable(var
);
4856 instructions
->push_tail(var
);
4859 if (redeclaring_per_vertex
&& block_type
!= earlier_per_vertex
) {
4860 /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10 spec:
4862 * It is also a compilation error ... to redeclare a built-in
4863 * block and then use a member from that built-in block that was
4864 * not included in the redeclaration.
4866 * This appears to be a clarification to the behaviour established
4867 * for gl_PerVertex by GLSL 1.50, therefore we implement this
4868 * behaviour regardless of GLSL version.
4870 * To prevent the shader from using a member that was not included in
4871 * the redeclaration, we disable any ir_variables that are still
4872 * associated with the old declaration of gl_PerVertex (since we've
4873 * already updated all of the variables contained in the new
4874 * gl_PerVertex to point to it).
4876 * As a side effect this will prevent
4877 * validate_intrastage_interface_blocks() from getting confused and
4878 * thinking there are conflicting definitions of gl_PerVertex in the
4881 foreach_list_safe(node
, instructions
) {
4882 ir_variable
*const var
= ((ir_instruction
*) node
)->as_variable();
4884 var
->get_interface_type() == earlier_per_vertex
) {
4885 state
->symbols
->disable_variable(var
->name
);
4897 ast_gs_input_layout::hir(exec_list
*instructions
,
4898 struct _mesa_glsl_parse_state
*state
)
4900 YYLTYPE loc
= this->get_location();
4902 /* If any geometry input layout declaration preceded this one, make sure it
4903 * was consistent with this one.
4905 if (state
->gs_input_prim_type_specified
&&
4906 state
->gs_input_prim_type
!= this->prim_type
) {
4907 _mesa_glsl_error(&loc
, state
,
4908 "geometry shader input layout does not match"
4909 " previous declaration");
4913 /* If any shader inputs occurred before this declaration and specified an
4914 * array size, make sure the size they specified is consistent with the
4917 unsigned num_vertices
= vertices_per_prim(this->prim_type
);
4918 if (state
->gs_input_size
!= 0 && state
->gs_input_size
!= num_vertices
) {
4919 _mesa_glsl_error(&loc
, state
,
4920 "this geometry shader input layout implies %u vertices"
4921 " per primitive, but a previous input is declared"
4922 " with size %u", num_vertices
, state
->gs_input_size
);
4926 state
->gs_input_prim_type_specified
= true;
4927 state
->gs_input_prim_type
= this->prim_type
;
4929 /* If any shader inputs occurred before this declaration and did not
4930 * specify an array size, their size is determined now.
4932 foreach_list (node
, instructions
) {
4933 ir_variable
*var
= ((ir_instruction
*) node
)->as_variable();
4934 if (var
== NULL
|| var
->mode
!= ir_var_shader_in
)
4937 /* Note: gl_PrimitiveIDIn has mode ir_var_shader_in, but it's not an
4940 if (!var
->type
->is_array())
4943 if (var
->type
->length
== 0) {
4944 if (var
->max_array_access
>= num_vertices
) {
4945 _mesa_glsl_error(&loc
, state
,
4946 "this geometry shader input layout implies %u"
4947 " vertices, but an access to element %u of input"
4948 " `%s' already exists", num_vertices
,
4949 var
->max_array_access
, var
->name
);
4951 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
4962 detect_conflicting_assignments(struct _mesa_glsl_parse_state
*state
,
4963 exec_list
*instructions
)
4965 bool gl_FragColor_assigned
= false;
4966 bool gl_FragData_assigned
= false;
4967 bool user_defined_fs_output_assigned
= false;
4968 ir_variable
*user_defined_fs_output
= NULL
;
4970 /* It would be nice to have proper location information. */
4972 memset(&loc
, 0, sizeof(loc
));
4974 foreach_list(node
, instructions
) {
4975 ir_variable
*var
= ((ir_instruction
*)node
)->as_variable();
4977 if (!var
|| !var
->assigned
)
4980 if (strcmp(var
->name
, "gl_FragColor") == 0)
4981 gl_FragColor_assigned
= true;
4982 else if (strcmp(var
->name
, "gl_FragData") == 0)
4983 gl_FragData_assigned
= true;
4984 else if (strncmp(var
->name
, "gl_", 3) != 0) {
4985 if (state
->target
== fragment_shader
&&
4986 var
->mode
== ir_var_shader_out
) {
4987 user_defined_fs_output_assigned
= true;
4988 user_defined_fs_output
= var
;
4993 /* From the GLSL 1.30 spec:
4995 * "If a shader statically assigns a value to gl_FragColor, it
4996 * may not assign a value to any element of gl_FragData. If a
4997 * shader statically writes a value to any element of
4998 * gl_FragData, it may not assign a value to
4999 * gl_FragColor. That is, a shader may assign values to either
5000 * gl_FragColor or gl_FragData, but not both. Multiple shaders
5001 * linked together must also consistently write just one of
5002 * these variables. Similarly, if user declared output
5003 * variables are in use (statically assigned to), then the
5004 * built-in variables gl_FragColor and gl_FragData may not be
5005 * assigned to. These incorrect usages all generate compile
5008 if (gl_FragColor_assigned
&& gl_FragData_assigned
) {
5009 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
5010 "`gl_FragColor' and `gl_FragData'");
5011 } else if (gl_FragColor_assigned
&& user_defined_fs_output_assigned
) {
5012 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
5013 "`gl_FragColor' and `%s'",
5014 user_defined_fs_output
->name
);
5015 } else if (gl_FragData_assigned
&& user_defined_fs_output_assigned
) {
5016 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
5017 "`gl_FragData' and `%s'",
5018 user_defined_fs_output
->name
);