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
)
1854 if (!type
->is_matrix()) {
1855 /* The OpenGL ES 3.0 conformance tests did not originally allow
1856 * matrix layout qualifiers on non-matrices. However, the OpenGL
1857 * 4.4 and OpenGL ES 3.0 (revision TBD) specifications were
1858 * amended to specifically allow these layouts on all types. Emit
1859 * a warning so that people know their code may not be portable.
1861 _mesa_glsl_warning(loc
, state
,
1862 "uniform block layout qualifiers row_major and "
1863 "column_major applied to non-matrix types may "
1864 "be rejected by older compilers");
1865 } else if (type
->is_record()) {
1866 /* We allow 'layout(row_major)' on structure types because it's the only
1867 * way to get row-major layouts on matrices contained in structures.
1869 _mesa_glsl_warning(loc
, state
,
1870 "uniform block layout qualifiers row_major and "
1871 "column_major applied to structure types is not "
1872 "strictly conformant and may be rejected by other "
1878 validate_binding_qualifier(struct _mesa_glsl_parse_state
*state
,
1881 const ast_type_qualifier
*qual
)
1883 if (var
->mode
!= ir_var_uniform
) {
1884 _mesa_glsl_error(loc
, state
,
1885 "the \"binding\" qualifier only applies to uniforms");
1889 if (qual
->binding
< 0) {
1890 _mesa_glsl_error(loc
, state
, "binding values must be >= 0");
1894 const struct gl_context
*const ctx
= state
->ctx
;
1895 unsigned elements
= var
->type
->is_array() ? var
->type
->length
: 1;
1896 unsigned max_index
= qual
->binding
+ elements
- 1;
1898 if (var
->type
->is_interface()) {
1899 /* UBOs. From page 60 of the GLSL 4.20 specification:
1900 * "If the binding point for any uniform block instance is less than zero,
1901 * or greater than or equal to the implementation-dependent maximum
1902 * number of uniform buffer bindings, a compilation error will occur.
1903 * When the binding identifier is used with a uniform block instanced as
1904 * an array of size N, all elements of the array from binding through
1905 * binding + N – 1 must be within this range."
1907 * The implementation-dependent maximum is GL_MAX_UNIFORM_BUFFER_BINDINGS.
1909 if (max_index
>= ctx
->Const
.MaxUniformBufferBindings
) {
1910 _mesa_glsl_error(loc
, state
, "layout(binding = %d) for %d UBOs exceeds "
1911 "the maximum number of UBO binding points (%d)",
1912 qual
->binding
, elements
,
1913 ctx
->Const
.MaxUniformBufferBindings
);
1916 } else if (var
->type
->is_sampler() ||
1917 (var
->type
->is_array() && var
->type
->fields
.array
->is_sampler())) {
1918 /* Samplers. From page 63 of the GLSL 4.20 specification:
1919 * "If the binding is less than zero, or greater than or equal to the
1920 * implementation-dependent maximum supported number of units, a
1921 * compilation error will occur. When the binding identifier is used
1922 * with an array of size N, all elements of the array from binding
1923 * through binding + N - 1 must be within this range."
1926 switch (state
->target
) {
1928 limit
= ctx
->Const
.VertexProgram
.MaxTextureImageUnits
;
1930 case geometry_shader
:
1931 limit
= ctx
->Const
.GeometryProgram
.MaxTextureImageUnits
;
1933 case fragment_shader
:
1934 limit
= ctx
->Const
.FragmentProgram
.MaxTextureImageUnits
;
1938 if (max_index
>= limit
) {
1939 _mesa_glsl_error(loc
, state
, "layout(binding = %d) for %d samplers "
1940 "exceeds the maximum number of texture image units "
1941 "(%d)", qual
->binding
, elements
, limit
);
1946 _mesa_glsl_error(loc
, state
,
1947 "the \"binding\" qualifier only applies to uniform "
1948 "blocks, samplers, or arrays of samplers");
1956 apply_type_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
1958 struct _mesa_glsl_parse_state
*state
,
1962 STATIC_ASSERT(sizeof(qual
->flags
.q
) <= sizeof(qual
->flags
.i
));
1964 if (qual
->flags
.q
.invariant
) {
1966 _mesa_glsl_error(loc
, state
,
1967 "variable `%s' may not be redeclared "
1968 "`invariant' after being used",
1975 if (qual
->flags
.q
.constant
|| qual
->flags
.q
.attribute
1976 || qual
->flags
.q
.uniform
1977 || (qual
->flags
.q
.varying
&& (state
->target
== fragment_shader
)))
1980 if (qual
->flags
.q
.centroid
)
1983 if (qual
->flags
.q
.attribute
&& state
->target
!= vertex_shader
) {
1984 var
->type
= glsl_type::error_type
;
1985 _mesa_glsl_error(loc
, state
,
1986 "`attribute' variables may not be declared in the "
1988 _mesa_glsl_shader_target_name(state
->target
));
1991 /* Section 6.1.1 (Function Calling Conventions) of the GLSL 1.10 spec says:
1993 * "However, the const qualifier cannot be used with out or inout."
1995 * The same section of the GLSL 4.40 spec further clarifies this saying:
1997 * "The const qualifier cannot be used with out or inout, or a
1998 * compile-time error results."
2000 if (is_parameter
&& qual
->flags
.q
.constant
&& qual
->flags
.q
.out
) {
2001 _mesa_glsl_error(loc
, state
,
2002 "`const' may not be applied to `out' or `inout' "
2003 "function parameters");
2006 /* If there is no qualifier that changes the mode of the variable, leave
2007 * the setting alone.
2009 if (qual
->flags
.q
.in
&& qual
->flags
.q
.out
)
2010 var
->mode
= ir_var_function_inout
;
2011 else if (qual
->flags
.q
.in
)
2012 var
->mode
= is_parameter
? ir_var_function_in
: ir_var_shader_in
;
2013 else if (qual
->flags
.q
.attribute
2014 || (qual
->flags
.q
.varying
&& (state
->target
== fragment_shader
)))
2015 var
->mode
= ir_var_shader_in
;
2016 else if (qual
->flags
.q
.out
)
2017 var
->mode
= is_parameter
? ir_var_function_out
: ir_var_shader_out
;
2018 else if (qual
->flags
.q
.varying
&& (state
->target
== vertex_shader
))
2019 var
->mode
= ir_var_shader_out
;
2020 else if (qual
->flags
.q
.uniform
)
2021 var
->mode
= ir_var_uniform
;
2023 if (!is_parameter
&& is_varying_var(var
, state
->target
)) {
2024 /* This variable is being used to link data between shader stages (in
2025 * pre-glsl-1.30 parlance, it's a "varying"). Check that it has a type
2026 * that is allowed for such purposes.
2028 * From page 25 (page 31 of the PDF) of the GLSL 1.10 spec:
2030 * "The varying qualifier can be used only with the data types
2031 * float, vec2, vec3, vec4, mat2, mat3, and mat4, or arrays of
2034 * This was relaxed in GLSL version 1.30 and GLSL ES version 3.00. From
2035 * page 31 (page 37 of the PDF) of the GLSL 1.30 spec:
2037 * "Fragment inputs can only be signed and unsigned integers and
2038 * integer vectors, float, floating-point vectors, matrices, or
2039 * arrays of these. Structures cannot be input.
2041 * Similar text exists in the section on vertex shader outputs.
2043 * Similar text exists in the GLSL ES 3.00 spec, except that the GLSL ES
2044 * 3.00 spec allows structs as well. Varying structs are also allowed
2047 switch (var
->type
->get_scalar_type()->base_type
) {
2048 case GLSL_TYPE_FLOAT
:
2049 /* Ok in all GLSL versions */
2051 case GLSL_TYPE_UINT
:
2053 if (state
->is_version(130, 300))
2055 _mesa_glsl_error(loc
, state
,
2056 "varying variables must be of base type float in %s",
2057 state
->get_version_string());
2059 case GLSL_TYPE_STRUCT
:
2060 if (state
->is_version(150, 300))
2062 _mesa_glsl_error(loc
, state
,
2063 "varying variables may not be of type struct");
2066 _mesa_glsl_error(loc
, state
, "illegal type for a varying variable");
2071 if (state
->all_invariant
&& (state
->current_function
== NULL
)) {
2072 switch (state
->target
) {
2074 if (var
->mode
== ir_var_shader_out
)
2075 var
->invariant
= true;
2077 case geometry_shader
:
2078 if ((var
->mode
== ir_var_shader_in
)
2079 || (var
->mode
== ir_var_shader_out
))
2080 var
->invariant
= true;
2082 case fragment_shader
:
2083 if (var
->mode
== ir_var_shader_in
)
2084 var
->invariant
= true;
2089 if (qual
->flags
.q
.flat
)
2090 var
->interpolation
= INTERP_QUALIFIER_FLAT
;
2091 else if (qual
->flags
.q
.noperspective
)
2092 var
->interpolation
= INTERP_QUALIFIER_NOPERSPECTIVE
;
2093 else if (qual
->flags
.q
.smooth
)
2094 var
->interpolation
= INTERP_QUALIFIER_SMOOTH
;
2096 var
->interpolation
= INTERP_QUALIFIER_NONE
;
2098 if (var
->interpolation
!= INTERP_QUALIFIER_NONE
) {
2099 ir_variable_mode mode
= (ir_variable_mode
) var
->mode
;
2101 if (mode
!= ir_var_shader_in
&& mode
!= ir_var_shader_out
) {
2102 _mesa_glsl_error(loc
, state
,
2103 "interpolation qualifier `%s' can only be applied to "
2104 "shader inputs or outputs.",
2105 var
->interpolation_string());
2109 if ((state
->target
== vertex_shader
&& mode
== ir_var_shader_in
) ||
2110 (state
->target
== fragment_shader
&& mode
== ir_var_shader_out
)) {
2111 _mesa_glsl_error(loc
, state
,
2112 "interpolation qualifier `%s' cannot be applied to "
2113 "vertex shader inputs or fragment shader outputs",
2114 var
->interpolation_string());
2118 var
->pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
2119 var
->origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
2120 if ((qual
->flags
.q
.origin_upper_left
|| qual
->flags
.q
.pixel_center_integer
)
2121 && (strcmp(var
->name
, "gl_FragCoord") != 0)) {
2122 const char *const qual_string
= (qual
->flags
.q
.origin_upper_left
)
2123 ? "origin_upper_left" : "pixel_center_integer";
2125 _mesa_glsl_error(loc
, state
,
2126 "layout qualifier `%s' can only be applied to "
2127 "fragment shader input `gl_FragCoord'",
2131 if (qual
->flags
.q
.explicit_location
) {
2132 const bool global_scope
= (state
->current_function
== NULL
);
2134 const char *string
= "";
2136 /* In the vertex shader only shader inputs can be given explicit
2139 * In the fragment shader only shader outputs can be given explicit
2142 switch (state
->target
) {
2144 if (!global_scope
|| (var
->mode
!= ir_var_shader_in
)) {
2150 case geometry_shader
:
2151 _mesa_glsl_error(loc
, state
,
2152 "geometry shader variables cannot be given "
2153 "explicit locations");
2156 case fragment_shader
:
2157 if (!global_scope
|| (var
->mode
!= ir_var_shader_out
)) {
2165 _mesa_glsl_error(loc
, state
,
2166 "only %s shader %s variables can be given an "
2167 "explicit location",
2168 _mesa_glsl_shader_target_name(state
->target
),
2171 var
->explicit_location
= true;
2173 /* This bit of silliness is needed because invalid explicit locations
2174 * are supposed to be flagged during linking. Small negative values
2175 * biased by VERT_ATTRIB_GENERIC0 or FRAG_RESULT_DATA0 could alias
2176 * built-in values (e.g., -16+VERT_ATTRIB_GENERIC0 = VERT_ATTRIB_POS).
2177 * The linker needs to be able to differentiate these cases. This
2178 * ensures that negative values stay negative.
2180 if (qual
->location
>= 0) {
2181 var
->location
= (state
->target
== vertex_shader
)
2182 ? (qual
->location
+ VERT_ATTRIB_GENERIC0
)
2183 : (qual
->location
+ FRAG_RESULT_DATA0
);
2185 var
->location
= qual
->location
;
2188 if (qual
->flags
.q
.explicit_index
) {
2189 /* From the GLSL 4.30 specification, section 4.4.2 (Output
2190 * Layout Qualifiers):
2192 * "It is also a compile-time error if a fragment shader
2193 * sets a layout index to less than 0 or greater than 1."
2195 * Older specifications don't mandate a behavior; we take
2196 * this as a clarification and always generate the error.
2198 if (qual
->index
< 0 || qual
->index
> 1) {
2199 _mesa_glsl_error(loc
, state
,
2200 "explicit index may only be 0 or 1");
2202 var
->explicit_index
= true;
2203 var
->index
= qual
->index
;
2207 } else if (qual
->flags
.q
.explicit_index
) {
2208 _mesa_glsl_error(loc
, state
,
2209 "explicit index requires explicit location");
2212 if (qual
->flags
.q
.explicit_binding
&&
2213 validate_binding_qualifier(state
, loc
, var
, qual
)) {
2214 var
->explicit_binding
= true;
2215 var
->binding
= qual
->binding
;
2218 /* Does the declaration use the deprecated 'attribute' or 'varying'
2221 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
2222 || qual
->flags
.q
.varying
;
2224 /* Is the 'layout' keyword used with parameters that allow relaxed checking.
2225 * Many implementations of GL_ARB_fragment_coord_conventions_enable and some
2226 * implementations (only Mesa?) GL_ARB_explicit_attrib_location_enable
2227 * allowed the layout qualifier to be used with 'varying' and 'attribute'.
2228 * These extensions and all following extensions that add the 'layout'
2229 * keyword have been modified to require the use of 'in' or 'out'.
2231 * The following extension do not allow the deprecated keywords:
2233 * GL_AMD_conservative_depth
2234 * GL_ARB_conservative_depth
2235 * GL_ARB_gpu_shader5
2236 * GL_ARB_separate_shader_objects
2237 * GL_ARB_tesselation_shader
2238 * GL_ARB_transform_feedback3
2239 * GL_ARB_uniform_buffer_object
2241 * It is unknown whether GL_EXT_shader_image_load_store or GL_NV_gpu_shader5
2242 * allow layout with the deprecated keywords.
2244 const bool relaxed_layout_qualifier_checking
=
2245 state
->ARB_fragment_coord_conventions_enable
;
2247 if (qual
->has_layout() && uses_deprecated_qualifier
) {
2248 if (relaxed_layout_qualifier_checking
) {
2249 _mesa_glsl_warning(loc
, state
,
2250 "`layout' qualifier may not be used with "
2251 "`attribute' or `varying'");
2253 _mesa_glsl_error(loc
, state
,
2254 "`layout' qualifier may not be used with "
2255 "`attribute' or `varying'");
2259 /* Layout qualifiers for gl_FragDepth, which are enabled by extension
2260 * AMD_conservative_depth.
2262 int depth_layout_count
= qual
->flags
.q
.depth_any
2263 + qual
->flags
.q
.depth_greater
2264 + qual
->flags
.q
.depth_less
2265 + qual
->flags
.q
.depth_unchanged
;
2266 if (depth_layout_count
> 0
2267 && !state
->AMD_conservative_depth_enable
2268 && !state
->ARB_conservative_depth_enable
) {
2269 _mesa_glsl_error(loc
, state
,
2270 "extension GL_AMD_conservative_depth or "
2271 "GL_ARB_conservative_depth must be enabled "
2272 "to use depth layout qualifiers");
2273 } else if (depth_layout_count
> 0
2274 && strcmp(var
->name
, "gl_FragDepth") != 0) {
2275 _mesa_glsl_error(loc
, state
,
2276 "depth layout qualifiers can be applied only to "
2278 } else if (depth_layout_count
> 1
2279 && strcmp(var
->name
, "gl_FragDepth") == 0) {
2280 _mesa_glsl_error(loc
, state
,
2281 "at most one depth layout qualifier can be applied to "
2284 if (qual
->flags
.q
.depth_any
)
2285 var
->depth_layout
= ir_depth_layout_any
;
2286 else if (qual
->flags
.q
.depth_greater
)
2287 var
->depth_layout
= ir_depth_layout_greater
;
2288 else if (qual
->flags
.q
.depth_less
)
2289 var
->depth_layout
= ir_depth_layout_less
;
2290 else if (qual
->flags
.q
.depth_unchanged
)
2291 var
->depth_layout
= ir_depth_layout_unchanged
;
2293 var
->depth_layout
= ir_depth_layout_none
;
2295 if (qual
->flags
.q
.std140
||
2296 qual
->flags
.q
.packed
||
2297 qual
->flags
.q
.shared
) {
2298 _mesa_glsl_error(loc
, state
,
2299 "uniform block layout qualifiers std140, packed, and "
2300 "shared can only be applied to uniform blocks, not "
2304 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
2305 validate_matrix_layout_for_type(state
, loc
, var
->type
);
2310 * Get the variable that is being redeclared by this declaration
2312 * Semantic checks to verify the validity of the redeclaration are also
2313 * performed. If semantic checks fail, compilation error will be emitted via
2314 * \c _mesa_glsl_error, but a non-\c NULL pointer will still be returned.
2317 * A pointer to an existing variable in the current scope if the declaration
2318 * is a redeclaration, \c NULL otherwise.
2321 get_variable_being_redeclared(ir_variable
*var
, ast_declaration
*decl
,
2322 struct _mesa_glsl_parse_state
*state
)
2324 /* Check if this declaration is actually a re-declaration, either to
2325 * resize an array or add qualifiers to an existing variable.
2327 * This is allowed for variables in the current scope, or when at
2328 * global scope (for built-ins in the implicit outer scope).
2330 ir_variable
*earlier
= state
->symbols
->get_variable(decl
->identifier
);
2331 if (earlier
== NULL
||
2332 (state
->current_function
!= NULL
&&
2333 !state
->symbols
->name_declared_this_scope(decl
->identifier
))) {
2338 YYLTYPE loc
= decl
->get_location();
2340 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec,
2342 * "It is legal to declare an array without a size and then
2343 * later re-declare the same name as an array of the same
2344 * type and specify a size."
2346 if ((earlier
->type
->array_size() == 0)
2347 && var
->type
->is_array()
2348 && (var
->type
->element_type() == earlier
->type
->element_type())) {
2349 /* FINISHME: This doesn't match the qualifiers on the two
2350 * FINISHME: declarations. It's not 100% clear whether this is
2351 * FINISHME: required or not.
2354 const unsigned size
= unsigned(var
->type
->array_size());
2355 check_builtin_array_max_size(var
->name
, size
, loc
, state
);
2356 if ((size
> 0) && (size
<= earlier
->max_array_access
)) {
2357 _mesa_glsl_error(& loc
, state
, "array size must be > %u due to "
2359 earlier
->max_array_access
);
2362 earlier
->type
= var
->type
;
2365 } else if ((state
->ARB_fragment_coord_conventions_enable
||
2366 state
->is_version(150, 0))
2367 && strcmp(var
->name
, "gl_FragCoord") == 0
2368 && earlier
->type
== var
->type
2369 && earlier
->mode
== var
->mode
) {
2370 /* Allow redeclaration of gl_FragCoord for ARB_fcc layout
2373 earlier
->origin_upper_left
= var
->origin_upper_left
;
2374 earlier
->pixel_center_integer
= var
->pixel_center_integer
;
2376 /* According to section 4.3.7 of the GLSL 1.30 spec,
2377 * the following built-in varaibles can be redeclared with an
2378 * interpolation qualifier:
2381 * * gl_FrontSecondaryColor
2382 * * gl_BackSecondaryColor
2384 * * gl_SecondaryColor
2386 } else if (state
->is_version(130, 0)
2387 && (strcmp(var
->name
, "gl_FrontColor") == 0
2388 || strcmp(var
->name
, "gl_BackColor") == 0
2389 || strcmp(var
->name
, "gl_FrontSecondaryColor") == 0
2390 || strcmp(var
->name
, "gl_BackSecondaryColor") == 0
2391 || strcmp(var
->name
, "gl_Color") == 0
2392 || strcmp(var
->name
, "gl_SecondaryColor") == 0)
2393 && earlier
->type
== var
->type
2394 && earlier
->mode
== var
->mode
) {
2395 earlier
->interpolation
= var
->interpolation
;
2397 /* Layout qualifiers for gl_FragDepth. */
2398 } else if ((state
->AMD_conservative_depth_enable
||
2399 state
->ARB_conservative_depth_enable
)
2400 && strcmp(var
->name
, "gl_FragDepth") == 0
2401 && earlier
->type
== var
->type
2402 && earlier
->mode
== var
->mode
) {
2404 /** From the AMD_conservative_depth spec:
2405 * Within any shader, the first redeclarations of gl_FragDepth
2406 * must appear before any use of gl_FragDepth.
2408 if (earlier
->used
) {
2409 _mesa_glsl_error(&loc
, state
,
2410 "the first redeclaration of gl_FragDepth "
2411 "must appear before any use of gl_FragDepth");
2414 /* Prevent inconsistent redeclaration of depth layout qualifier. */
2415 if (earlier
->depth_layout
!= ir_depth_layout_none
2416 && earlier
->depth_layout
!= var
->depth_layout
) {
2417 _mesa_glsl_error(&loc
, state
,
2418 "gl_FragDepth: depth layout is declared here "
2419 "as '%s, but it was previously declared as "
2421 depth_layout_string(var
->depth_layout
),
2422 depth_layout_string(earlier
->depth_layout
));
2425 earlier
->depth_layout
= var
->depth_layout
;
2428 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", decl
->identifier
);
2435 * Generate the IR for an initializer in a variable declaration
2438 process_initializer(ir_variable
*var
, ast_declaration
*decl
,
2439 ast_fully_specified_type
*type
,
2440 exec_list
*initializer_instructions
,
2441 struct _mesa_glsl_parse_state
*state
)
2443 ir_rvalue
*result
= NULL
;
2445 YYLTYPE initializer_loc
= decl
->initializer
->get_location();
2447 /* From page 24 (page 30 of the PDF) of the GLSL 1.10 spec:
2449 * "All uniform variables are read-only and are initialized either
2450 * directly by an application via API commands, or indirectly by
2453 if (var
->mode
== ir_var_uniform
) {
2454 state
->check_version(120, 0, &initializer_loc
,
2455 "cannot initialize uniforms");
2458 if (var
->type
->is_sampler()) {
2459 _mesa_glsl_error(& initializer_loc
, state
,
2460 "cannot initialize samplers");
2463 if ((var
->mode
== ir_var_shader_in
) && (state
->current_function
== NULL
)) {
2464 _mesa_glsl_error(& initializer_loc
, state
,
2465 "cannot initialize %s shader input / %s",
2466 _mesa_glsl_shader_target_name(state
->target
),
2467 (state
->target
== vertex_shader
)
2468 ? "attribute" : "varying");
2471 ir_dereference
*const lhs
= new(state
) ir_dereference_variable(var
);
2472 ir_rvalue
*rhs
= decl
->initializer
->hir(initializer_instructions
,
2475 /* Calculate the constant value if this is a const or uniform
2478 if (type
->qualifier
.flags
.q
.constant
2479 || type
->qualifier
.flags
.q
.uniform
) {
2480 ir_rvalue
*new_rhs
= validate_assignment(state
, var
->type
, rhs
, true);
2481 if (new_rhs
!= NULL
) {
2484 ir_constant
*constant_value
= rhs
->constant_expression_value();
2485 if (!constant_value
) {
2486 /* If ARB_shading_language_420pack is enabled, initializers of
2487 * const-qualified local variables do not have to be constant
2488 * expressions. Const-qualified global variables must still be
2489 * initialized with constant expressions.
2491 if (!state
->ARB_shading_language_420pack_enable
2492 || state
->current_function
== NULL
) {
2493 _mesa_glsl_error(& initializer_loc
, state
,
2494 "initializer of %s variable `%s' must be a "
2495 "constant expression",
2496 (type
->qualifier
.flags
.q
.constant
)
2497 ? "const" : "uniform",
2499 if (var
->type
->is_numeric()) {
2500 /* Reduce cascading errors. */
2501 var
->constant_value
= ir_constant::zero(state
, var
->type
);
2505 rhs
= constant_value
;
2506 var
->constant_value
= constant_value
;
2509 _mesa_glsl_error(&initializer_loc
, state
,
2510 "initializer of type %s cannot be assigned to "
2511 "variable of type %s",
2512 rhs
->type
->name
, var
->type
->name
);
2513 if (var
->type
->is_numeric()) {
2514 /* Reduce cascading errors. */
2515 var
->constant_value
= ir_constant::zero(state
, var
->type
);
2520 if (rhs
&& !rhs
->type
->is_error()) {
2521 bool temp
= var
->read_only
;
2522 if (type
->qualifier
.flags
.q
.constant
)
2523 var
->read_only
= false;
2525 /* Never emit code to initialize a uniform.
2527 const glsl_type
*initializer_type
;
2528 if (!type
->qualifier
.flags
.q
.uniform
) {
2529 result
= do_assignment(initializer_instructions
, state
,
2532 type
->get_location());
2533 initializer_type
= result
->type
;
2535 initializer_type
= rhs
->type
;
2537 var
->constant_initializer
= rhs
->constant_expression_value();
2538 var
->has_initializer
= true;
2540 /* If the declared variable is an unsized array, it must inherrit
2541 * its full type from the initializer. A declaration such as
2543 * uniform float a[] = float[](1.0, 2.0, 3.0, 3.0);
2547 * uniform float a[4] = float[](1.0, 2.0, 3.0, 3.0);
2549 * The assignment generated in the if-statement (below) will also
2550 * automatically handle this case for non-uniforms.
2552 * If the declared variable is not an array, the types must
2553 * already match exactly. As a result, the type assignment
2554 * here can be done unconditionally. For non-uniforms the call
2555 * to do_assignment can change the type of the initializer (via
2556 * the implicit conversion rules). For uniforms the initializer
2557 * must be a constant expression, and the type of that expression
2558 * was validated above.
2560 var
->type
= initializer_type
;
2562 var
->read_only
= temp
;
2570 * Do additional processing necessary for geometry shader input declarations
2571 * (this covers both interface blocks arrays and bare input variables).
2574 handle_geometry_shader_input_decl(struct _mesa_glsl_parse_state
*state
,
2575 YYLTYPE loc
, ir_variable
*var
)
2577 unsigned num_vertices
= 0;
2578 if (state
->gs_input_prim_type_specified
) {
2579 num_vertices
= vertices_per_prim(state
->gs_input_prim_type
);
2582 /* Geometry shader input variables must be arrays. Caller should have
2583 * reported an error for this.
2585 if (!var
->type
->is_array()) {
2586 assert(state
->error
);
2588 /* To avoid cascading failures, short circuit the checks below. */
2592 if (var
->type
->length
== 0) {
2593 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec says:
2595 * All geometry shader input unsized array declarations will be
2596 * sized by an earlier input layout qualifier, when present, as per
2597 * the following table.
2599 * Followed by a table mapping each allowed input layout qualifier to
2600 * the corresponding input length.
2602 if (num_vertices
!= 0)
2603 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
2606 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec
2607 * includes the following examples of compile-time errors:
2609 * // code sequence within one shader...
2610 * in vec4 Color1[]; // size unknown
2611 * ...Color1.length()...// illegal, length() unknown
2612 * in vec4 Color2[2]; // size is 2
2613 * ...Color1.length()...// illegal, Color1 still has no size
2614 * in vec4 Color3[3]; // illegal, input sizes are inconsistent
2615 * layout(lines) in; // legal, input size is 2, matching
2616 * in vec4 Color4[3]; // illegal, contradicts layout
2619 * To detect the case illustrated by Color3, we verify that the size of
2620 * an explicitly-sized array matches the size of any previously declared
2621 * explicitly-sized array. To detect the case illustrated by Color4, we
2622 * verify that the size of an explicitly-sized array is consistent with
2623 * any previously declared input layout.
2625 if (num_vertices
!= 0 && var
->type
->length
!= num_vertices
) {
2626 _mesa_glsl_error(&loc
, state
,
2627 "geometry shader input size contradicts previously"
2628 " declared layout (size is %u, but layout requires a"
2629 " size of %u)", var
->type
->length
, num_vertices
);
2630 } else if (state
->gs_input_size
!= 0 &&
2631 var
->type
->length
!= state
->gs_input_size
) {
2632 _mesa_glsl_error(&loc
, state
,
2633 "geometry shader input sizes are "
2634 "inconsistent (size is %u, but a previous "
2635 "declaration has size %u)",
2636 var
->type
->length
, state
->gs_input_size
);
2638 state
->gs_input_size
= var
->type
->length
;
2644 ast_declarator_list::hir(exec_list
*instructions
,
2645 struct _mesa_glsl_parse_state
*state
)
2648 const struct glsl_type
*decl_type
;
2649 const char *type_name
= NULL
;
2650 ir_rvalue
*result
= NULL
;
2651 YYLTYPE loc
= this->get_location();
2653 /* From page 46 (page 52 of the PDF) of the GLSL 1.50 spec:
2655 * "To ensure that a particular output variable is invariant, it is
2656 * necessary to use the invariant qualifier. It can either be used to
2657 * qualify a previously declared variable as being invariant
2659 * invariant gl_Position; // make existing gl_Position be invariant"
2661 * In these cases the parser will set the 'invariant' flag in the declarator
2662 * list, and the type will be NULL.
2664 if (this->invariant
) {
2665 assert(this->type
== NULL
);
2667 if (state
->current_function
!= NULL
) {
2668 _mesa_glsl_error(& loc
, state
,
2669 "all uses of `invariant' keyword must be at global "
2673 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
2674 assert(!decl
->is_array
);
2675 assert(decl
->array_size
== NULL
);
2676 assert(decl
->initializer
== NULL
);
2678 ir_variable
*const earlier
=
2679 state
->symbols
->get_variable(decl
->identifier
);
2680 if (earlier
== NULL
) {
2681 _mesa_glsl_error(& loc
, state
,
2682 "undeclared variable `%s' cannot be marked "
2683 "invariant", decl
->identifier
);
2684 } else if ((state
->target
== vertex_shader
)
2685 && (earlier
->mode
!= ir_var_shader_out
)) {
2686 _mesa_glsl_error(& loc
, state
,
2687 "`%s' cannot be marked invariant, vertex shader "
2688 "outputs only", decl
->identifier
);
2689 } else if ((state
->target
== fragment_shader
)
2690 && (earlier
->mode
!= ir_var_shader_in
)) {
2691 _mesa_glsl_error(& loc
, state
,
2692 "`%s' cannot be marked invariant, fragment shader "
2693 "inputs only", decl
->identifier
);
2694 } else if (earlier
->used
) {
2695 _mesa_glsl_error(& loc
, state
,
2696 "variable `%s' may not be redeclared "
2697 "`invariant' after being used",
2700 earlier
->invariant
= true;
2704 /* Invariant redeclarations do not have r-values.
2709 assert(this->type
!= NULL
);
2710 assert(!this->invariant
);
2712 /* The type specifier may contain a structure definition. Process that
2713 * before any of the variable declarations.
2715 (void) this->type
->specifier
->hir(instructions
, state
);
2717 decl_type
= this->type
->glsl_type(& type_name
, state
);
2718 if (this->declarations
.is_empty()) {
2719 /* If there is no structure involved in the program text, there are two
2720 * possible scenarios:
2722 * - The program text contained something like 'vec4;'. This is an
2723 * empty declaration. It is valid but weird. Emit a warning.
2725 * - The program text contained something like 'S;' and 'S' is not the
2726 * name of a known structure type. This is both invalid and weird.
2729 * - The program text contained something like 'mediump float;'
2730 * when the programmer probably meant 'precision mediump
2731 * float;' Emit a warning with a description of what they
2732 * probably meant to do.
2734 * Note that if decl_type is NULL and there is a structure involved,
2735 * there must have been some sort of error with the structure. In this
2736 * case we assume that an error was already generated on this line of
2737 * code for the structure. There is no need to generate an additional,
2740 assert(this->type
->specifier
->structure
== NULL
|| decl_type
!= NULL
2743 if (decl_type
== NULL
) {
2744 _mesa_glsl_error(&loc
, state
,
2745 "invalid type `%s' in empty declaration",
2747 } else if (this->type
->qualifier
.precision
!= ast_precision_none
) {
2748 if (this->type
->specifier
->structure
!= NULL
) {
2749 _mesa_glsl_error(&loc
, state
,
2750 "precision qualifiers can't be applied "
2753 static const char *const precision_names
[] = {
2760 _mesa_glsl_warning(&loc
, state
,
2761 "empty declaration with precision qualifier, "
2762 "to set the default precision, use "
2763 "`precision %s %s;'",
2764 precision_names
[this->type
->qualifier
.precision
],
2768 _mesa_glsl_warning(&loc
, state
, "empty declaration");
2772 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
2773 const struct glsl_type
*var_type
;
2776 /* FINISHME: Emit a warning if a variable declaration shadows a
2777 * FINISHME: declaration at a higher scope.
2780 if ((decl_type
== NULL
) || decl_type
->is_void()) {
2781 if (type_name
!= NULL
) {
2782 _mesa_glsl_error(& loc
, state
,
2783 "invalid type `%s' in declaration of `%s'",
2784 type_name
, decl
->identifier
);
2786 _mesa_glsl_error(& loc
, state
,
2787 "invalid type in declaration of `%s'",
2793 if (decl
->is_array
) {
2794 var_type
= process_array_type(&loc
, decl_type
, decl
->array_size
,
2796 if (var_type
->is_error())
2799 var_type
= decl_type
;
2802 var
= new(ctx
) ir_variable(var_type
, decl
->identifier
, ir_var_auto
);
2804 /* The 'varying in' and 'varying out' qualifiers can only be used with
2805 * ARB_geometry_shader4 and EXT_geometry_shader4, which we don't support
2808 if (this->type
->qualifier
.flags
.q
.varying
) {
2809 if (this->type
->qualifier
.flags
.q
.in
) {
2810 _mesa_glsl_error(& loc
, state
,
2811 "`varying in' qualifier in declaration of "
2812 "`%s' only valid for geometry shaders using "
2813 "ARB_geometry_shader4 or EXT_geometry_shader4",
2815 } else if (this->type
->qualifier
.flags
.q
.out
) {
2816 _mesa_glsl_error(& loc
, state
,
2817 "`varying out' qualifier in declaration of "
2818 "`%s' only valid for geometry shaders using "
2819 "ARB_geometry_shader4 or EXT_geometry_shader4",
2824 /* From page 22 (page 28 of the PDF) of the GLSL 1.10 specification;
2826 * "Global variables can only use the qualifiers const,
2827 * attribute, uni form, or varying. Only one may be
2830 * Local variables can only use the qualifier const."
2832 * This is relaxed in GLSL 1.30 and GLSL ES 3.00. It is also relaxed by
2833 * any extension that adds the 'layout' keyword.
2835 if (!state
->is_version(130, 300)
2836 && !state
->ARB_explicit_attrib_location_enable
2837 && !state
->ARB_fragment_coord_conventions_enable
) {
2838 if (this->type
->qualifier
.flags
.q
.out
) {
2839 _mesa_glsl_error(& loc
, state
,
2840 "`out' qualifier in declaration of `%s' "
2841 "only valid for function parameters in %s",
2842 decl
->identifier
, state
->get_version_string());
2844 if (this->type
->qualifier
.flags
.q
.in
) {
2845 _mesa_glsl_error(& loc
, state
,
2846 "`in' qualifier in declaration of `%s' "
2847 "only valid for function parameters in %s",
2848 decl
->identifier
, state
->get_version_string());
2850 /* FINISHME: Test for other invalid qualifiers. */
2853 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
,
2856 if (this->type
->qualifier
.flags
.q
.invariant
) {
2857 if ((state
->target
== vertex_shader
) &&
2858 var
->mode
!= ir_var_shader_out
) {
2859 _mesa_glsl_error(& loc
, state
,
2860 "`%s' cannot be marked invariant, vertex shader "
2861 "outputs only", var
->name
);
2862 } else if ((state
->target
== fragment_shader
) &&
2863 var
->mode
!= ir_var_shader_in
) {
2864 /* FINISHME: Note that this doesn't work for invariant on
2865 * a function signature inval
2867 _mesa_glsl_error(& loc
, state
,
2868 "`%s' cannot be marked invariant, fragment shader "
2869 "inputs only", var
->name
);
2873 if (state
->current_function
!= NULL
) {
2874 const char *mode
= NULL
;
2875 const char *extra
= "";
2877 /* There is no need to check for 'inout' here because the parser will
2878 * only allow that in function parameter lists.
2880 if (this->type
->qualifier
.flags
.q
.attribute
) {
2882 } else if (this->type
->qualifier
.flags
.q
.uniform
) {
2884 } else if (this->type
->qualifier
.flags
.q
.varying
) {
2886 } else if (this->type
->qualifier
.flags
.q
.in
) {
2888 extra
= " or in function parameter list";
2889 } else if (this->type
->qualifier
.flags
.q
.out
) {
2891 extra
= " or in function parameter list";
2895 _mesa_glsl_error(& loc
, state
,
2896 "%s variable `%s' must be declared at "
2898 mode
, var
->name
, extra
);
2900 } else if (var
->mode
== ir_var_shader_in
) {
2901 var
->read_only
= true;
2903 if (state
->target
== vertex_shader
) {
2904 bool error_emitted
= false;
2906 /* From page 31 (page 37 of the PDF) of the GLSL 1.50 spec:
2908 * "Vertex shader inputs can only be float, floating-point
2909 * vectors, matrices, signed and unsigned integers and integer
2910 * vectors. Vertex shader inputs can also form arrays of these
2911 * types, but not structures."
2913 * From page 31 (page 27 of the PDF) of the GLSL 1.30 spec:
2915 * "Vertex shader inputs can only be float, floating-point
2916 * vectors, matrices, signed and unsigned integers and integer
2917 * vectors. They cannot be arrays or structures."
2919 * From page 23 (page 29 of the PDF) of the GLSL 1.20 spec:
2921 * "The attribute qualifier can be used only with float,
2922 * floating-point vectors, and matrices. Attribute variables
2923 * cannot be declared as arrays or structures."
2925 * From page 33 (page 39 of the PDF) of the GLSL ES 3.00 spec:
2927 * "Vertex shader inputs can only be float, floating-point
2928 * vectors, matrices, signed and unsigned integers and integer
2929 * vectors. Vertex shader inputs cannot be arrays or
2932 const glsl_type
*check_type
= var
->type
->is_array()
2933 ? var
->type
->fields
.array
: var
->type
;
2935 switch (check_type
->base_type
) {
2936 case GLSL_TYPE_FLOAT
:
2938 case GLSL_TYPE_UINT
:
2940 if (state
->is_version(120, 300))
2944 _mesa_glsl_error(& loc
, state
,
2945 "vertex shader input / attribute cannot have "
2947 var
->type
->is_array() ? "array of " : "",
2949 error_emitted
= true;
2952 if (!error_emitted
&& var
->type
->is_array() &&
2953 !state
->check_version(150, 0, &loc
,
2954 "vertex shader input / attribute "
2955 "cannot have array type")) {
2956 error_emitted
= true;
2958 } else if (state
->target
== geometry_shader
) {
2959 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
2961 * Geometry shader input variables get the per-vertex values
2962 * written out by vertex shader output variables of the same
2963 * names. Since a geometry shader operates on a set of
2964 * vertices, each input varying variable (or input block, see
2965 * interface blocks below) needs to be declared as an array.
2967 if (!var
->type
->is_array()) {
2968 _mesa_glsl_error(&loc
, state
,
2969 "geometry shader inputs must be arrays");
2972 handle_geometry_shader_input_decl(state
, loc
, var
);
2976 /* Integer fragment inputs must be qualified with 'flat'. In GLSL ES,
2977 * so must integer vertex outputs.
2979 * From section 4.3.4 ("Inputs") of the GLSL 1.50 spec:
2980 * "Fragment shader inputs that are signed or unsigned integers or
2981 * integer vectors must be qualified with the interpolation qualifier
2984 * From section 4.3.4 ("Input Variables") of the GLSL 3.00 ES spec:
2985 * "Fragment shader inputs that are, or contain, signed or unsigned
2986 * integers or integer vectors must be qualified with the
2987 * interpolation qualifier flat."
2989 * From section 4.3.6 ("Output Variables") of the GLSL 3.00 ES spec:
2990 * "Vertex shader outputs that are, or contain, signed or unsigned
2991 * integers or integer vectors must be qualified with the
2992 * interpolation qualifier flat."
2994 * Note that prior to GLSL 1.50, this requirement applied to vertex
2995 * outputs rather than fragment inputs. That creates problems in the
2996 * presence of geometry shaders, so we adopt the GLSL 1.50 rule for all
2997 * desktop GL shaders. For GLSL ES shaders, we follow the spec and
2998 * apply the restriction to both vertex outputs and fragment inputs.
3000 * Note also that the desktop GLSL specs are missing the text "or
3001 * contain"; this is presumably an oversight, since there is no
3002 * reasonable way to interpolate a fragment shader input that contains
3005 if (state
->is_version(130, 300) &&
3006 var
->type
->contains_integer() &&
3007 var
->interpolation
!= INTERP_QUALIFIER_FLAT
&&
3008 ((state
->target
== fragment_shader
&& var
->mode
== ir_var_shader_in
)
3009 || (state
->target
== vertex_shader
&& var
->mode
== ir_var_shader_out
3010 && state
->es_shader
))) {
3011 const char *var_type
= (state
->target
== vertex_shader
) ?
3012 "vertex output" : "fragment input";
3013 _mesa_glsl_error(&loc
, state
, "if a %s is (or contains) "
3014 "an integer, then it must be qualified with 'flat'",
3019 /* Interpolation qualifiers cannot be applied to 'centroid' and
3020 * 'centroid varying'.
3022 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
3023 * "interpolation qualifiers may only precede the qualifiers in,
3024 * centroid in, out, or centroid out in a declaration. They do not apply
3025 * to the deprecated storage qualifiers varying or centroid varying."
3027 * These deprecated storage qualifiers do not exist in GLSL ES 3.00.
3029 if (state
->is_version(130, 0)
3030 && this->type
->qualifier
.has_interpolation()
3031 && this->type
->qualifier
.flags
.q
.varying
) {
3033 const char *i
= this->type
->qualifier
.interpolation_string();
3036 if (this->type
->qualifier
.flags
.q
.centroid
)
3037 s
= "centroid varying";
3041 _mesa_glsl_error(&loc
, state
,
3042 "qualifier '%s' cannot be applied to the "
3043 "deprecated storage qualifier '%s'", i
, s
);
3047 /* Interpolation qualifiers can only apply to vertex shader outputs and
3048 * fragment shader inputs.
3050 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
3051 * "Outputs from a vertex shader (out) and inputs to a fragment
3052 * shader (in) can be further qualified with one or more of these
3053 * interpolation qualifiers"
3055 * From page 31 (page 37 of the PDF) of the GLSL ES 3.00 spec:
3056 * "These interpolation qualifiers may only precede the qualifiers
3057 * in, centroid in, out, or centroid out in a declaration. They do
3058 * not apply to inputs into a vertex shader or outputs from a
3061 if (state
->is_version(130, 300)
3062 && this->type
->qualifier
.has_interpolation()) {
3064 const char *i
= this->type
->qualifier
.interpolation_string();
3067 switch (state
->target
) {
3069 if (this->type
->qualifier
.flags
.q
.in
) {
3070 _mesa_glsl_error(&loc
, state
,
3071 "qualifier '%s' cannot be applied to vertex "
3072 "shader inputs", i
);
3075 case fragment_shader
:
3076 if (this->type
->qualifier
.flags
.q
.out
) {
3077 _mesa_glsl_error(&loc
, state
,
3078 "qualifier '%s' cannot be applied to fragment "
3079 "shader outputs", i
);
3088 /* From section 4.3.4 of the GLSL 1.30 spec:
3089 * "It is an error to use centroid in in a vertex shader."
3091 * From section 4.3.4 of the GLSL ES 3.00 spec:
3092 * "It is an error to use centroid in or interpolation qualifiers in
3093 * a vertex shader input."
3095 if (state
->is_version(130, 300)
3096 && this->type
->qualifier
.flags
.q
.centroid
3097 && this->type
->qualifier
.flags
.q
.in
3098 && state
->target
== vertex_shader
) {
3100 _mesa_glsl_error(&loc
, state
,
3101 "'centroid in' cannot be used in a vertex shader");
3104 /* Section 4.3.6 of the GLSL 1.30 specification states:
3105 * "It is an error to use centroid out in a fragment shader."
3107 * The GL_ARB_shading_language_420pack extension specification states:
3108 * "It is an error to use auxiliary storage qualifiers or interpolation
3109 * qualifiers on an output in a fragment shader."
3111 if (state
->target
== fragment_shader
&&
3112 this->type
->qualifier
.flags
.q
.out
&&
3113 this->type
->qualifier
.has_auxiliary_storage()) {
3114 _mesa_glsl_error(&loc
, state
,
3115 "auxiliary storage qualifiers cannot be used on "
3116 "fragment shader outputs");
3119 /* Precision qualifiers exists only in GLSL versions 1.00 and >= 1.30.
3121 if (this->type
->qualifier
.precision
!= ast_precision_none
) {
3122 state
->check_precision_qualifiers_allowed(&loc
);
3126 /* Precision qualifiers only apply to floating point and integer types.
3128 * From section 4.5.2 of the GLSL 1.30 spec:
3129 * "Any floating point or any integer declaration can have the type
3130 * preceded by one of these precision qualifiers [...] Literal
3131 * constants do not have precision qualifiers. Neither do Boolean
3134 * In GLSL ES, sampler types are also allowed.
3136 * From page 87 of the GLSL ES spec:
3137 * "RESOLUTION: Allow sampler types to take a precision qualifier."
3139 if (this->type
->qualifier
.precision
!= ast_precision_none
3140 && !var
->type
->is_float()
3141 && !var
->type
->is_integer()
3142 && !var
->type
->is_record()
3143 && !(var
->type
->is_sampler() && state
->es_shader
)
3144 && !(var
->type
->is_array()
3145 && (var
->type
->fields
.array
->is_float()
3146 || var
->type
->fields
.array
->is_integer()))) {
3148 _mesa_glsl_error(&loc
, state
,
3149 "precision qualifiers apply only to floating point"
3150 "%s types", state
->es_shader
? ", integer, and sampler"
3154 /* From page 17 (page 23 of the PDF) of the GLSL 1.20 spec:
3156 * "[Sampler types] can only be declared as function
3157 * parameters or uniform variables (see Section 4.3.5
3160 if (var_type
->contains_sampler() &&
3161 !this->type
->qualifier
.flags
.q
.uniform
) {
3162 _mesa_glsl_error(&loc
, state
, "samplers must be declared uniform");
3165 /* Process the initializer and add its instructions to a temporary
3166 * list. This list will be added to the instruction stream (below) after
3167 * the declaration is added. This is done because in some cases (such as
3168 * redeclarations) the declaration may not actually be added to the
3169 * instruction stream.
3171 exec_list initializer_instructions
;
3172 ir_variable
*earlier
= get_variable_being_redeclared(var
, decl
, state
);
3174 if (decl
->initializer
!= NULL
) {
3175 result
= process_initializer((earlier
== NULL
) ? var
: earlier
,
3177 &initializer_instructions
, state
);
3180 /* From page 23 (page 29 of the PDF) of the GLSL 1.10 spec:
3182 * "It is an error to write to a const variable outside of
3183 * its declaration, so they must be initialized when
3186 if (this->type
->qualifier
.flags
.q
.constant
&& decl
->initializer
== NULL
) {
3187 _mesa_glsl_error(& loc
, state
,
3188 "const declaration of `%s' must be initialized",
3192 if (state
->es_shader
) {
3193 const glsl_type
*const t
= (earlier
== NULL
)
3194 ? var
->type
: earlier
->type
;
3196 if (t
->is_array() && t
->length
== 0)
3197 /* Section 10.17 of the GLSL ES 1.00 specification states that
3198 * unsized array declarations have been removed from the language.
3199 * Arrays that are sized using an initializer are still explicitly
3200 * sized. However, GLSL ES 1.00 does not allow array
3201 * initializers. That is only allowed in GLSL ES 3.00.
3203 * Section 4.1.9 (Arrays) of the GLSL ES 3.00 spec says:
3205 * "An array type can also be formed without specifying a size
3206 * if the definition includes an initializer:
3208 * float x[] = float[2] (1.0, 2.0); // declares an array of size 2
3209 * float y[] = float[] (1.0, 2.0, 3.0); // declares an array of size 3
3214 _mesa_glsl_error(& loc
, state
,
3215 "unsized array declarations are not allowed in "
3219 /* If the declaration is not a redeclaration, there are a few additional
3220 * semantic checks that must be applied. In addition, variable that was
3221 * created for the declaration should be added to the IR stream.
3223 if (earlier
== NULL
) {
3224 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
3226 * "Identifiers starting with "gl_" are reserved for use by
3227 * OpenGL, and may not be declared in a shader as either a
3228 * variable or a function."
3230 if (strncmp(decl
->identifier
, "gl_", 3) == 0)
3231 _mesa_glsl_error(& loc
, state
,
3232 "identifier `%s' uses reserved `gl_' prefix",
3234 else if (strstr(decl
->identifier
, "__")) {
3235 /* From page 14 (page 20 of the PDF) of the GLSL 1.10
3238 * "In addition, all identifiers containing two
3239 * consecutive underscores (__) are reserved as
3240 * possible future keywords."
3242 _mesa_glsl_error(& loc
, state
,
3243 "identifier `%s' uses reserved `__' string",
3247 /* Add the variable to the symbol table. Note that the initializer's
3248 * IR was already processed earlier (though it hasn't been emitted
3249 * yet), without the variable in scope.
3251 * This differs from most C-like languages, but it follows the GLSL
3252 * specification. From page 28 (page 34 of the PDF) of the GLSL 1.50
3255 * "Within a declaration, the scope of a name starts immediately
3256 * after the initializer if present or immediately after the name
3257 * being declared if not."
3259 if (!state
->symbols
->add_variable(var
)) {
3260 YYLTYPE loc
= this->get_location();
3261 _mesa_glsl_error(&loc
, state
, "name `%s' already taken in the "
3262 "current scope", decl
->identifier
);
3266 /* Push the variable declaration to the top. It means that all the
3267 * variable declarations will appear in a funny last-to-first order,
3268 * but otherwise we run into trouble if a function is prototyped, a
3269 * global var is decled, then the function is defined with usage of
3270 * the global var. See glslparsertest's CorrectModule.frag.
3272 instructions
->push_head(var
);
3275 instructions
->append_list(&initializer_instructions
);
3279 /* Generally, variable declarations do not have r-values. However,
3280 * one is used for the declaration in
3282 * while (bool b = some_condition()) {
3286 * so we return the rvalue from the last seen declaration here.
3293 ast_parameter_declarator::hir(exec_list
*instructions
,
3294 struct _mesa_glsl_parse_state
*state
)
3297 const struct glsl_type
*type
;
3298 const char *name
= NULL
;
3299 YYLTYPE loc
= this->get_location();
3301 type
= this->type
->glsl_type(& name
, state
);
3305 _mesa_glsl_error(& loc
, state
,
3306 "invalid type `%s' in declaration of `%s'",
3307 name
, this->identifier
);
3309 _mesa_glsl_error(& loc
, state
,
3310 "invalid type in declaration of `%s'",
3314 type
= glsl_type::error_type
;
3317 /* From page 62 (page 68 of the PDF) of the GLSL 1.50 spec:
3319 * "Functions that accept no input arguments need not use void in the
3320 * argument list because prototypes (or definitions) are required and
3321 * therefore there is no ambiguity when an empty argument list "( )" is
3322 * declared. The idiom "(void)" as a parameter list is provided for
3325 * Placing this check here prevents a void parameter being set up
3326 * for a function, which avoids tripping up checks for main taking
3327 * parameters and lookups of an unnamed symbol.
3329 if (type
->is_void()) {
3330 if (this->identifier
!= NULL
)
3331 _mesa_glsl_error(& loc
, state
,
3332 "named parameter cannot have type `void'");
3338 if (formal_parameter
&& (this->identifier
== NULL
)) {
3339 _mesa_glsl_error(& loc
, state
, "formal parameter lacks a name");
3343 /* This only handles "vec4 foo[..]". The earlier specifier->glsl_type(...)
3344 * call already handled the "vec4[..] foo" case.
3346 if (this->is_array
) {
3347 type
= process_array_type(&loc
, type
, this->array_size
, state
);
3350 if (!type
->is_error() && type
->array_size() == 0) {
3351 _mesa_glsl_error(&loc
, state
, "arrays passed as parameters must have "
3353 type
= glsl_type::error_type
;
3357 ir_variable
*var
= new(ctx
)
3358 ir_variable(type
, this->identifier
, ir_var_function_in
);
3360 /* Apply any specified qualifiers to the parameter declaration. Note that
3361 * for function parameters the default mode is 'in'.
3363 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
, & loc
,
3366 /* From page 17 (page 23 of the PDF) of the GLSL 1.20 spec:
3368 * "Samplers cannot be treated as l-values; hence cannot be used
3369 * as out or inout function parameters, nor can they be assigned
3372 if ((var
->mode
== ir_var_function_inout
|| var
->mode
== ir_var_function_out
)
3373 && type
->contains_sampler()) {
3374 _mesa_glsl_error(&loc
, state
, "out and inout parameters cannot contain samplers");
3375 type
= glsl_type::error_type
;
3378 /* From page 39 (page 45 of the PDF) of the GLSL 1.10 spec:
3380 * "When calling a function, expressions that do not evaluate to
3381 * l-values cannot be passed to parameters declared as out or inout."
3383 * From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
3385 * "Other binary or unary expressions, non-dereferenced arrays,
3386 * function names, swizzles with repeated fields, and constants
3387 * cannot be l-values."
3389 * So for GLSL 1.10, passing an array as an out or inout parameter is not
3390 * allowed. This restriction is removed in GLSL 1.20, and in GLSL ES.
3392 if ((var
->mode
== ir_var_function_inout
|| var
->mode
== ir_var_function_out
)
3394 && !state
->check_version(120, 100, &loc
,
3395 "arrays cannot be out or inout parameters")) {
3396 type
= glsl_type::error_type
;
3399 instructions
->push_tail(var
);
3401 /* Parameter declarations do not have r-values.
3408 ast_parameter_declarator::parameters_to_hir(exec_list
*ast_parameters
,
3410 exec_list
*ir_parameters
,
3411 _mesa_glsl_parse_state
*state
)
3413 ast_parameter_declarator
*void_param
= NULL
;
3416 foreach_list_typed (ast_parameter_declarator
, param
, link
, ast_parameters
) {
3417 param
->formal_parameter
= formal
;
3418 param
->hir(ir_parameters
, state
);
3426 if ((void_param
!= NULL
) && (count
> 1)) {
3427 YYLTYPE loc
= void_param
->get_location();
3429 _mesa_glsl_error(& loc
, state
,
3430 "`void' parameter must be only parameter");
3436 emit_function(_mesa_glsl_parse_state
*state
, ir_function
*f
)
3438 /* IR invariants disallow function declarations or definitions
3439 * nested within other function definitions. But there is no
3440 * requirement about the relative order of function declarations
3441 * and definitions with respect to one another. So simply insert
3442 * the new ir_function block at the end of the toplevel instruction
3445 state
->toplevel_ir
->push_tail(f
);
3450 ast_function::hir(exec_list
*instructions
,
3451 struct _mesa_glsl_parse_state
*state
)
3454 ir_function
*f
= NULL
;
3455 ir_function_signature
*sig
= NULL
;
3456 exec_list hir_parameters
;
3458 const char *const name
= identifier
;
3460 /* New functions are always added to the top-level IR instruction stream,
3461 * so this instruction list pointer is ignored. See also emit_function
3464 (void) instructions
;
3466 /* From page 21 (page 27 of the PDF) of the GLSL 1.20 spec,
3468 * "Function declarations (prototypes) cannot occur inside of functions;
3469 * they must be at global scope, or for the built-in functions, outside
3470 * the global scope."
3472 * From page 27 (page 33 of the PDF) of the GLSL ES 1.00.16 spec,
3474 * "User defined functions may only be defined within the global scope."
3476 * Note that this language does not appear in GLSL 1.10.
3478 if ((state
->current_function
!= NULL
) &&
3479 state
->is_version(120, 100)) {
3480 YYLTYPE loc
= this->get_location();
3481 _mesa_glsl_error(&loc
, state
,
3482 "declaration of function `%s' not allowed within "
3483 "function body", name
);
3486 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
3488 * "Identifiers starting with "gl_" are reserved for use by
3489 * OpenGL, and may not be declared in a shader as either a
3490 * variable or a function."
3492 if (strncmp(name
, "gl_", 3) == 0) {
3493 YYLTYPE loc
= this->get_location();
3494 _mesa_glsl_error(&loc
, state
,
3495 "identifier `%s' uses reserved `gl_' prefix", name
);
3498 /* Convert the list of function parameters to HIR now so that they can be
3499 * used below to compare this function's signature with previously seen
3500 * signatures for functions with the same name.
3502 ast_parameter_declarator::parameters_to_hir(& this->parameters
,
3504 & hir_parameters
, state
);
3506 const char *return_type_name
;
3507 const glsl_type
*return_type
=
3508 this->return_type
->glsl_type(& return_type_name
, state
);
3511 YYLTYPE loc
= this->get_location();
3512 _mesa_glsl_error(&loc
, state
,
3513 "function `%s' has undeclared return type `%s'",
3514 name
, return_type_name
);
3515 return_type
= glsl_type::error_type
;
3518 /* From page 56 (page 62 of the PDF) of the GLSL 1.30 spec:
3519 * "No qualifier is allowed on the return type of a function."
3521 if (this->return_type
->has_qualifiers()) {
3522 YYLTYPE loc
= this->get_location();
3523 _mesa_glsl_error(& loc
, state
,
3524 "function `%s' return type has qualifiers", name
);
3527 /* Section 6.1 (Function Definitions) of the GLSL 1.20 spec says:
3529 * "Arrays are allowed as arguments and as the return type. In both
3530 * cases, the array must be explicitly sized."
3532 if (return_type
->is_array() && return_type
->length
== 0) {
3533 YYLTYPE loc
= this->get_location();
3534 _mesa_glsl_error(& loc
, state
,
3535 "function `%s' return type array must be explicitly "
3539 /* From page 17 (page 23 of the PDF) of the GLSL 1.20 spec:
3541 * "[Sampler types] can only be declared as function parameters
3542 * or uniform variables (see Section 4.3.5 "Uniform")".
3544 if (return_type
->contains_sampler()) {
3545 YYLTYPE loc
= this->get_location();
3546 _mesa_glsl_error(&loc
, state
,
3547 "function `%s' return type can't contain a sampler",
3551 /* Verify that this function's signature either doesn't match a previously
3552 * seen signature for a function with the same name, or, if a match is found,
3553 * that the previously seen signature does not have an associated definition.
3555 f
= state
->symbols
->get_function(name
);
3556 if (f
!= NULL
&& (state
->es_shader
|| f
->has_user_signature())) {
3557 sig
= f
->exact_matching_signature(&hir_parameters
);
3559 const char *badvar
= sig
->qualifiers_match(&hir_parameters
);
3560 if (badvar
!= NULL
) {
3561 YYLTYPE loc
= this->get_location();
3563 _mesa_glsl_error(&loc
, state
, "function `%s' parameter `%s' "
3564 "qualifiers don't match prototype", name
, badvar
);
3567 if (sig
->return_type
!= return_type
) {
3568 YYLTYPE loc
= this->get_location();
3570 _mesa_glsl_error(&loc
, state
, "function `%s' return type doesn't "
3571 "match prototype", name
);
3574 if (sig
->is_defined
) {
3575 if (is_definition
) {
3576 YYLTYPE loc
= this->get_location();
3577 _mesa_glsl_error(& loc
, state
, "function `%s' redefined", name
);
3579 /* We just encountered a prototype that exactly matches a
3580 * function that's already been defined. This is redundant,
3581 * and we should ignore it.
3588 f
= new(ctx
) ir_function(name
);
3589 if (!state
->symbols
->add_function(f
)) {
3590 /* This function name shadows a non-function use of the same name. */
3591 YYLTYPE loc
= this->get_location();
3593 _mesa_glsl_error(&loc
, state
, "function name `%s' conflicts with "
3594 "non-function", name
);
3598 emit_function(state
, f
);
3601 /* Verify the return type of main() */
3602 if (strcmp(name
, "main") == 0) {
3603 if (! return_type
->is_void()) {
3604 YYLTYPE loc
= this->get_location();
3606 _mesa_glsl_error(& loc
, state
, "main() must return void");
3609 if (!hir_parameters
.is_empty()) {
3610 YYLTYPE loc
= this->get_location();
3612 _mesa_glsl_error(& loc
, state
, "main() must not take any parameters");
3616 /* Finish storing the information about this new function in its signature.
3619 sig
= new(ctx
) ir_function_signature(return_type
);
3620 f
->add_signature(sig
);
3623 sig
->replace_parameters(&hir_parameters
);
3626 /* Function declarations (prototypes) do not have r-values.
3633 ast_function_definition::hir(exec_list
*instructions
,
3634 struct _mesa_glsl_parse_state
*state
)
3636 prototype
->is_definition
= true;
3637 prototype
->hir(instructions
, state
);
3639 ir_function_signature
*signature
= prototype
->signature
;
3640 if (signature
== NULL
)
3643 assert(state
->current_function
== NULL
);
3644 state
->current_function
= signature
;
3645 state
->found_return
= false;
3647 /* Duplicate parameters declared in the prototype as concrete variables.
3648 * Add these to the symbol table.
3650 state
->symbols
->push_scope();
3651 foreach_iter(exec_list_iterator
, iter
, signature
->parameters
) {
3652 ir_variable
*const var
= ((ir_instruction
*) iter
.get())->as_variable();
3654 assert(var
!= NULL
);
3656 /* The only way a parameter would "exist" is if two parameters have
3659 if (state
->symbols
->name_declared_this_scope(var
->name
)) {
3660 YYLTYPE loc
= this->get_location();
3662 _mesa_glsl_error(& loc
, state
, "parameter `%s' redeclared", var
->name
);
3664 state
->symbols
->add_variable(var
);
3668 /* Convert the body of the function to HIR. */
3669 this->body
->hir(&signature
->body
, state
);
3670 signature
->is_defined
= true;
3672 state
->symbols
->pop_scope();
3674 assert(state
->current_function
== signature
);
3675 state
->current_function
= NULL
;
3677 if (!signature
->return_type
->is_void() && !state
->found_return
) {
3678 YYLTYPE loc
= this->get_location();
3679 _mesa_glsl_error(& loc
, state
, "function `%s' has non-void return type "
3680 "%s, but no return statement",
3681 signature
->function_name(),
3682 signature
->return_type
->name
);
3685 /* Function definitions do not have r-values.
3692 ast_jump_statement::hir(exec_list
*instructions
,
3693 struct _mesa_glsl_parse_state
*state
)
3700 assert(state
->current_function
);
3702 if (opt_return_value
) {
3703 ir_rvalue
*ret
= opt_return_value
->hir(instructions
, state
);
3705 /* The value of the return type can be NULL if the shader says
3706 * 'return foo();' and foo() is a function that returns void.
3708 * NOTE: The GLSL spec doesn't say that this is an error. The type
3709 * of the return value is void. If the return type of the function is
3710 * also void, then this should compile without error. Seriously.
3712 const glsl_type
*const ret_type
=
3713 (ret
== NULL
) ? glsl_type::void_type
: ret
->type
;
3715 /* Implicit conversions are not allowed for return values prior to
3716 * ARB_shading_language_420pack.
3718 if (state
->current_function
->return_type
!= ret_type
) {
3719 YYLTYPE loc
= this->get_location();
3721 if (state
->ARB_shading_language_420pack_enable
) {
3722 if (!apply_implicit_conversion(state
->current_function
->return_type
,
3724 _mesa_glsl_error(& loc
, state
,
3725 "could not implicitly convert return value "
3726 "to %s, in function `%s'",
3727 state
->current_function
->return_type
->name
,
3728 state
->current_function
->function_name());
3731 _mesa_glsl_error(& loc
, state
,
3732 "`return' with wrong type %s, in function `%s' "
3735 state
->current_function
->function_name(),
3736 state
->current_function
->return_type
->name
);
3738 } else if (state
->current_function
->return_type
->base_type
==
3740 YYLTYPE loc
= this->get_location();
3742 /* The ARB_shading_language_420pack, GLSL ES 3.0, and GLSL 4.20
3743 * specs add a clarification:
3745 * "A void function can only use return without a return argument, even if
3746 * the return argument has void type. Return statements only accept values:
3749 * void func2() { return func1(); } // illegal return statement"
3751 _mesa_glsl_error(& loc
, state
,
3752 "void functions can only use `return' without a "
3756 inst
= new(ctx
) ir_return(ret
);
3758 if (state
->current_function
->return_type
->base_type
!=
3760 YYLTYPE loc
= this->get_location();
3762 _mesa_glsl_error(& loc
, state
,
3763 "`return' with no value, in function %s returning "
3765 state
->current_function
->function_name());
3767 inst
= new(ctx
) ir_return
;
3770 state
->found_return
= true;
3771 instructions
->push_tail(inst
);
3776 if (state
->target
!= fragment_shader
) {
3777 YYLTYPE loc
= this->get_location();
3779 _mesa_glsl_error(& loc
, state
,
3780 "`discard' may only appear in a fragment shader");
3782 instructions
->push_tail(new(ctx
) ir_discard
);
3787 if (mode
== ast_continue
&&
3788 state
->loop_nesting_ast
== NULL
) {
3789 YYLTYPE loc
= this->get_location();
3791 _mesa_glsl_error(& loc
, state
,
3792 "continue may only appear in a loop");
3793 } else if (mode
== ast_break
&&
3794 state
->loop_nesting_ast
== NULL
&&
3795 state
->switch_state
.switch_nesting_ast
== NULL
) {
3796 YYLTYPE loc
= this->get_location();
3798 _mesa_glsl_error(& loc
, state
,
3799 "break may only appear in a loop or a switch");
3801 /* For a loop, inline the for loop expression again,
3802 * since we don't know where near the end of
3803 * the loop body the normal copy of it
3804 * is going to be placed.
3806 if (state
->loop_nesting_ast
!= NULL
&&
3807 mode
== ast_continue
&&
3808 state
->loop_nesting_ast
->rest_expression
) {
3809 state
->loop_nesting_ast
->rest_expression
->hir(instructions
,
3813 if (state
->switch_state
.is_switch_innermost
&&
3814 mode
== ast_break
) {
3815 /* Force break out of switch by setting is_break switch state.
3817 ir_variable
*const is_break_var
= state
->switch_state
.is_break_var
;
3818 ir_dereference_variable
*const deref_is_break_var
=
3819 new(ctx
) ir_dereference_variable(is_break_var
);
3820 ir_constant
*const true_val
= new(ctx
) ir_constant(true);
3821 ir_assignment
*const set_break_var
=
3822 new(ctx
) ir_assignment(deref_is_break_var
, true_val
);
3824 instructions
->push_tail(set_break_var
);
3827 ir_loop_jump
*const jump
=
3828 new(ctx
) ir_loop_jump((mode
== ast_break
)
3829 ? ir_loop_jump::jump_break
3830 : ir_loop_jump::jump_continue
);
3831 instructions
->push_tail(jump
);
3838 /* Jump instructions do not have r-values.
3845 ast_selection_statement::hir(exec_list
*instructions
,
3846 struct _mesa_glsl_parse_state
*state
)
3850 ir_rvalue
*const condition
= this->condition
->hir(instructions
, state
);
3852 /* From page 66 (page 72 of the PDF) of the GLSL 1.50 spec:
3854 * "Any expression whose type evaluates to a Boolean can be used as the
3855 * conditional expression bool-expression. Vector types are not accepted
3856 * as the expression to if."
3858 * The checks are separated so that higher quality diagnostics can be
3859 * generated for cases where both rules are violated.
3861 if (!condition
->type
->is_boolean() || !condition
->type
->is_scalar()) {
3862 YYLTYPE loc
= this->condition
->get_location();
3864 _mesa_glsl_error(& loc
, state
, "if-statement condition must be scalar "
3868 ir_if
*const stmt
= new(ctx
) ir_if(condition
);
3870 if (then_statement
!= NULL
) {
3871 state
->symbols
->push_scope();
3872 then_statement
->hir(& stmt
->then_instructions
, state
);
3873 state
->symbols
->pop_scope();
3876 if (else_statement
!= NULL
) {
3877 state
->symbols
->push_scope();
3878 else_statement
->hir(& stmt
->else_instructions
, state
);
3879 state
->symbols
->pop_scope();
3882 instructions
->push_tail(stmt
);
3884 /* if-statements do not have r-values.
3891 ast_switch_statement::hir(exec_list
*instructions
,
3892 struct _mesa_glsl_parse_state
*state
)
3896 ir_rvalue
*const test_expression
=
3897 this->test_expression
->hir(instructions
, state
);
3899 /* From page 66 (page 55 of the PDF) of the GLSL 1.50 spec:
3901 * "The type of init-expression in a switch statement must be a
3904 if (!test_expression
->type
->is_scalar() ||
3905 !test_expression
->type
->is_integer()) {
3906 YYLTYPE loc
= this->test_expression
->get_location();
3908 _mesa_glsl_error(& loc
,
3910 "switch-statement expression must be scalar "
3914 /* Track the switch-statement nesting in a stack-like manner.
3916 struct glsl_switch_state saved
= state
->switch_state
;
3918 state
->switch_state
.is_switch_innermost
= true;
3919 state
->switch_state
.switch_nesting_ast
= this;
3920 state
->switch_state
.labels_ht
= hash_table_ctor(0, hash_table_pointer_hash
,
3921 hash_table_pointer_compare
);
3922 state
->switch_state
.previous_default
= NULL
;
3924 /* Initalize is_fallthru state to false.
3926 ir_rvalue
*const is_fallthru_val
= new (ctx
) ir_constant(false);
3927 state
->switch_state
.is_fallthru_var
=
3928 new(ctx
) ir_variable(glsl_type::bool_type
,
3929 "switch_is_fallthru_tmp",
3931 instructions
->push_tail(state
->switch_state
.is_fallthru_var
);
3933 ir_dereference_variable
*deref_is_fallthru_var
=
3934 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
3935 instructions
->push_tail(new(ctx
) ir_assignment(deref_is_fallthru_var
,
3938 /* Initalize is_break state to false.
3940 ir_rvalue
*const is_break_val
= new (ctx
) ir_constant(false);
3941 state
->switch_state
.is_break_var
= new(ctx
) ir_variable(glsl_type::bool_type
,
3942 "switch_is_break_tmp",
3944 instructions
->push_tail(state
->switch_state
.is_break_var
);
3946 ir_dereference_variable
*deref_is_break_var
=
3947 new(ctx
) ir_dereference_variable(state
->switch_state
.is_break_var
);
3948 instructions
->push_tail(new(ctx
) ir_assignment(deref_is_break_var
,
3951 /* Cache test expression.
3953 test_to_hir(instructions
, state
);
3955 /* Emit code for body of switch stmt.
3957 body
->hir(instructions
, state
);
3959 hash_table_dtor(state
->switch_state
.labels_ht
);
3961 state
->switch_state
= saved
;
3963 /* Switch statements do not have r-values. */
3969 ast_switch_statement::test_to_hir(exec_list
*instructions
,
3970 struct _mesa_glsl_parse_state
*state
)
3974 /* Cache value of test expression. */
3975 ir_rvalue
*const test_val
=
3976 test_expression
->hir(instructions
,
3979 state
->switch_state
.test_var
= new(ctx
) ir_variable(test_val
->type
,
3982 ir_dereference_variable
*deref_test_var
=
3983 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
3985 instructions
->push_tail(state
->switch_state
.test_var
);
3986 instructions
->push_tail(new(ctx
) ir_assignment(deref_test_var
, test_val
));
3991 ast_switch_body::hir(exec_list
*instructions
,
3992 struct _mesa_glsl_parse_state
*state
)
3995 stmts
->hir(instructions
, state
);
3997 /* Switch bodies do not have r-values. */
4002 ast_case_statement_list::hir(exec_list
*instructions
,
4003 struct _mesa_glsl_parse_state
*state
)
4005 foreach_list_typed (ast_case_statement
, case_stmt
, link
, & this->cases
)
4006 case_stmt
->hir(instructions
, state
);
4008 /* Case statements do not have r-values. */
4013 ast_case_statement::hir(exec_list
*instructions
,
4014 struct _mesa_glsl_parse_state
*state
)
4016 labels
->hir(instructions
, state
);
4018 /* Conditionally set fallthru state based on break state. */
4019 ir_constant
*const false_val
= new(state
) ir_constant(false);
4020 ir_dereference_variable
*const deref_is_fallthru_var
=
4021 new(state
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
4022 ir_dereference_variable
*const deref_is_break_var
=
4023 new(state
) ir_dereference_variable(state
->switch_state
.is_break_var
);
4024 ir_assignment
*const reset_fallthru_on_break
=
4025 new(state
) ir_assignment(deref_is_fallthru_var
,
4027 deref_is_break_var
);
4028 instructions
->push_tail(reset_fallthru_on_break
);
4030 /* Guard case statements depending on fallthru state. */
4031 ir_dereference_variable
*const deref_fallthru_guard
=
4032 new(state
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
4033 ir_if
*const test_fallthru
= new(state
) ir_if(deref_fallthru_guard
);
4035 foreach_list_typed (ast_node
, stmt
, link
, & this->stmts
)
4036 stmt
->hir(& test_fallthru
->then_instructions
, state
);
4038 instructions
->push_tail(test_fallthru
);
4040 /* Case statements do not have r-values. */
4046 ast_case_label_list::hir(exec_list
*instructions
,
4047 struct _mesa_glsl_parse_state
*state
)
4049 foreach_list_typed (ast_case_label
, label
, link
, & this->labels
)
4050 label
->hir(instructions
, state
);
4052 /* Case labels do not have r-values. */
4057 ast_case_label::hir(exec_list
*instructions
,
4058 struct _mesa_glsl_parse_state
*state
)
4062 ir_dereference_variable
*deref_fallthru_var
=
4063 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
4065 ir_rvalue
*const true_val
= new(ctx
) ir_constant(true);
4067 /* If not default case, ... */
4068 if (this->test_value
!= NULL
) {
4069 /* Conditionally set fallthru state based on
4070 * comparison of cached test expression value to case label.
4072 ir_rvalue
*const label_rval
= this->test_value
->hir(instructions
, state
);
4073 ir_constant
*label_const
= label_rval
->constant_expression_value();
4076 YYLTYPE loc
= this->test_value
->get_location();
4078 _mesa_glsl_error(& loc
, state
,
4079 "switch statement case label must be a "
4080 "constant expression");
4082 /* Stuff a dummy value in to allow processing to continue. */
4083 label_const
= new(ctx
) ir_constant(0);
4085 ast_expression
*previous_label
= (ast_expression
*)
4086 hash_table_find(state
->switch_state
.labels_ht
,
4087 (void *)(uintptr_t)label_const
->value
.u
[0]);
4089 if (previous_label
) {
4090 YYLTYPE loc
= this->test_value
->get_location();
4091 _mesa_glsl_error(& loc
, state
,
4092 "duplicate case value");
4094 loc
= previous_label
->get_location();
4095 _mesa_glsl_error(& loc
, state
,
4096 "this is the previous case label");
4098 hash_table_insert(state
->switch_state
.labels_ht
,
4100 (void *)(uintptr_t)label_const
->value
.u
[0]);
4104 ir_dereference_variable
*deref_test_var
=
4105 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
4107 ir_rvalue
*const test_cond
= new(ctx
) ir_expression(ir_binop_all_equal
,
4111 ir_assignment
*set_fallthru_on_test
=
4112 new(ctx
) ir_assignment(deref_fallthru_var
,
4116 instructions
->push_tail(set_fallthru_on_test
);
4117 } else { /* default case */
4118 if (state
->switch_state
.previous_default
) {
4119 YYLTYPE loc
= this->get_location();
4120 _mesa_glsl_error(& loc
, state
,
4121 "multiple default labels in one switch");
4123 loc
= state
->switch_state
.previous_default
->get_location();
4124 _mesa_glsl_error(& loc
, state
,
4125 "this is the first default label");
4127 state
->switch_state
.previous_default
= this;
4129 /* Set falltrhu state. */
4130 ir_assignment
*set_fallthru
=
4131 new(ctx
) ir_assignment(deref_fallthru_var
, true_val
);
4133 instructions
->push_tail(set_fallthru
);
4136 /* Case statements do not have r-values. */
4141 ast_iteration_statement::condition_to_hir(ir_loop
*stmt
,
4142 struct _mesa_glsl_parse_state
*state
)
4146 if (condition
!= NULL
) {
4147 ir_rvalue
*const cond
=
4148 condition
->hir(& stmt
->body_instructions
, state
);
4151 || !cond
->type
->is_boolean() || !cond
->type
->is_scalar()) {
4152 YYLTYPE loc
= condition
->get_location();
4154 _mesa_glsl_error(& loc
, state
,
4155 "loop condition must be scalar boolean");
4157 /* As the first code in the loop body, generate a block that looks
4158 * like 'if (!condition) break;' as the loop termination condition.
4160 ir_rvalue
*const not_cond
=
4161 new(ctx
) ir_expression(ir_unop_logic_not
, cond
);
4163 ir_if
*const if_stmt
= new(ctx
) ir_if(not_cond
);
4165 ir_jump
*const break_stmt
=
4166 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
4168 if_stmt
->then_instructions
.push_tail(break_stmt
);
4169 stmt
->body_instructions
.push_tail(if_stmt
);
4176 ast_iteration_statement::hir(exec_list
*instructions
,
4177 struct _mesa_glsl_parse_state
*state
)
4181 /* For-loops and while-loops start a new scope, but do-while loops do not.
4183 if (mode
!= ast_do_while
)
4184 state
->symbols
->push_scope();
4186 if (init_statement
!= NULL
)
4187 init_statement
->hir(instructions
, state
);
4189 ir_loop
*const stmt
= new(ctx
) ir_loop();
4190 instructions
->push_tail(stmt
);
4192 /* Track the current loop nesting. */
4193 ast_iteration_statement
*nesting_ast
= state
->loop_nesting_ast
;
4195 state
->loop_nesting_ast
= this;
4197 /* Likewise, indicate that following code is closest to a loop,
4198 * NOT closest to a switch.
4200 bool saved_is_switch_innermost
= state
->switch_state
.is_switch_innermost
;
4201 state
->switch_state
.is_switch_innermost
= false;
4203 if (mode
!= ast_do_while
)
4204 condition_to_hir(stmt
, state
);
4207 body
->hir(& stmt
->body_instructions
, state
);
4209 if (rest_expression
!= NULL
)
4210 rest_expression
->hir(& stmt
->body_instructions
, state
);
4212 if (mode
== ast_do_while
)
4213 condition_to_hir(stmt
, state
);
4215 if (mode
!= ast_do_while
)
4216 state
->symbols
->pop_scope();
4218 /* Restore previous nesting before returning. */
4219 state
->loop_nesting_ast
= nesting_ast
;
4220 state
->switch_state
.is_switch_innermost
= saved_is_switch_innermost
;
4222 /* Loops do not have r-values.
4229 * Determine if the given type is valid for establishing a default precision
4232 * From GLSL ES 3.00 section 4.5.4 ("Default Precision Qualifiers"):
4234 * "The precision statement
4236 * precision precision-qualifier type;
4238 * can be used to establish a default precision qualifier. The type field
4239 * can be either int or float or any of the sampler types, and the
4240 * precision-qualifier can be lowp, mediump, or highp."
4242 * GLSL ES 1.00 has similar language. GLSL 1.30 doesn't allow precision
4243 * qualifiers on sampler types, but this seems like an oversight (since the
4244 * intention of including these in GLSL 1.30 is to allow compatibility with ES
4245 * shaders). So we allow int, float, and all sampler types regardless of GLSL
4249 is_valid_default_precision_type(const struct glsl_type
*const type
)
4254 switch (type
->base_type
) {
4256 case GLSL_TYPE_FLOAT
:
4257 /* "int" and "float" are valid, but vectors and matrices are not. */
4258 return type
->vector_elements
== 1 && type
->matrix_columns
== 1;
4259 case GLSL_TYPE_SAMPLER
:
4268 ast_type_specifier::hir(exec_list
*instructions
,
4269 struct _mesa_glsl_parse_state
*state
)
4271 if (this->default_precision
== ast_precision_none
&& this->structure
== NULL
)
4274 YYLTYPE loc
= this->get_location();
4276 /* If this is a precision statement, check that the type to which it is
4277 * applied is either float or int.
4279 * From section 4.5.3 of the GLSL 1.30 spec:
4280 * "The precision statement
4281 * precision precision-qualifier type;
4282 * can be used to establish a default precision qualifier. The type
4283 * field can be either int or float [...]. Any other types or
4284 * qualifiers will result in an error.
4286 if (this->default_precision
!= ast_precision_none
) {
4287 if (!state
->check_precision_qualifiers_allowed(&loc
))
4290 if (this->structure
!= NULL
) {
4291 _mesa_glsl_error(&loc
, state
,
4292 "precision qualifiers do not apply to structures");
4296 if (this->is_array
) {
4297 _mesa_glsl_error(&loc
, state
,
4298 "default precision statements do not apply to "
4303 const struct glsl_type
*const type
=
4304 state
->symbols
->get_type(this->type_name
);
4305 if (!is_valid_default_precision_type(type
)) {
4306 _mesa_glsl_error(&loc
, state
,
4307 "default precision statements apply only to "
4308 "float, int, and sampler types");
4312 if (type
->base_type
== GLSL_TYPE_FLOAT
4314 && state
->target
== fragment_shader
) {
4315 /* Section 4.5.3 (Default Precision Qualifiers) of the GLSL ES 1.00
4318 * "The fragment language has no default precision qualifier for
4319 * floating point types."
4321 * As a result, we have to track whether or not default precision has
4322 * been specified for float in GLSL ES fragment shaders.
4324 * Earlier in that same section, the spec says:
4326 * "Non-precision qualified declarations will use the precision
4327 * qualifier specified in the most recent precision statement
4328 * that is still in scope. The precision statement has the same
4329 * scoping rules as variable declarations. If it is declared
4330 * inside a compound statement, its effect stops at the end of
4331 * the innermost statement it was declared in. Precision
4332 * statements in nested scopes override precision statements in
4333 * outer scopes. Multiple precision statements for the same basic
4334 * type can appear inside the same scope, with later statements
4335 * overriding earlier statements within that scope."
4337 * Default precision specifications follow the same scope rules as
4338 * variables. So, we can track the state of the default float
4339 * precision in the symbol table, and the rules will just work. This
4340 * is a slight abuse of the symbol table, but it has the semantics
4343 ir_variable
*const junk
=
4344 new(state
) ir_variable(type
, "#default precision",
4347 state
->symbols
->add_variable(junk
);
4350 /* FINISHME: Translate precision statements into IR. */
4354 /* _mesa_ast_set_aggregate_type() sets the <structure> field so that
4355 * process_record_constructor() can do type-checking on C-style initializer
4356 * expressions of structs, but ast_struct_specifier should only be translated
4357 * to HIR if it is declaring the type of a structure.
4359 * The ->is_declaration field is false for initializers of variables
4360 * declared separately from the struct's type definition.
4362 * struct S { ... }; (is_declaration = true)
4363 * struct T { ... } t = { ... }; (is_declaration = true)
4364 * S s = { ... }; (is_declaration = false)
4366 if (this->structure
!= NULL
&& this->structure
->is_declaration
)
4367 return this->structure
->hir(instructions
, state
);
4374 * Process a structure or interface block tree into an array of structure fields
4376 * After parsing, where there are some syntax differnces, structures and
4377 * interface blocks are almost identical. They are similar enough that the
4378 * AST for each can be processed the same way into a set of
4379 * \c glsl_struct_field to describe the members.
4382 * The number of fields processed. A pointer to the array structure fields is
4383 * stored in \c *fields_ret.
4386 ast_process_structure_or_interface_block(exec_list
*instructions
,
4387 struct _mesa_glsl_parse_state
*state
,
4388 exec_list
*declarations
,
4390 glsl_struct_field
**fields_ret
,
4392 bool block_row_major
)
4394 unsigned decl_count
= 0;
4396 /* Make an initial pass over the list of fields to determine how
4397 * many there are. Each element in this list is an ast_declarator_list.
4398 * This means that we actually need to count the number of elements in the
4399 * 'declarations' list in each of the elements.
4401 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
4402 foreach_list_const (decl_ptr
, & decl_list
->declarations
) {
4407 /* Allocate storage for the fields and process the field
4408 * declarations. As the declarations are processed, try to also convert
4409 * the types to HIR. This ensures that structure definitions embedded in
4410 * other structure definitions or in interface blocks are processed.
4412 glsl_struct_field
*const fields
= ralloc_array(state
, glsl_struct_field
,
4416 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
4417 const char *type_name
;
4419 decl_list
->type
->specifier
->hir(instructions
, state
);
4421 /* Section 10.9 of the GLSL ES 1.00 specification states that
4422 * embedded structure definitions have been removed from the language.
4424 if (state
->es_shader
&& decl_list
->type
->specifier
->structure
!= NULL
) {
4425 _mesa_glsl_error(&loc
, state
, "embedded structure definitions are "
4426 "not allowed in GLSL ES 1.00");
4429 const glsl_type
*decl_type
=
4430 decl_list
->type
->glsl_type(& type_name
, state
);
4432 foreach_list_typed (ast_declaration
, decl
, link
,
4433 &decl_list
->declarations
) {
4434 /* From the GL_ARB_uniform_buffer_object spec:
4436 * "Sampler types are not allowed inside of uniform
4437 * blocks. All other types, arrays, and structures
4438 * allowed for uniforms are allowed within a uniform
4441 * It should be impossible for decl_type to be NULL here. Cases that
4442 * might naturally lead to decl_type being NULL, especially for the
4443 * is_interface case, will have resulted in compilation having
4444 * already halted due to a syntax error.
4446 const struct glsl_type
*field_type
=
4447 decl_type
!= NULL
? decl_type
: glsl_type::error_type
;
4449 if (is_interface
&& field_type
->contains_sampler()) {
4450 YYLTYPE loc
= decl_list
->get_location();
4451 _mesa_glsl_error(&loc
, state
,
4452 "uniform in non-default uniform block contains sampler");
4455 const struct ast_type_qualifier
*const qual
=
4456 & decl_list
->type
->qualifier
;
4457 if (qual
->flags
.q
.std140
||
4458 qual
->flags
.q
.packed
||
4459 qual
->flags
.q
.shared
) {
4460 _mesa_glsl_error(&loc
, state
,
4461 "uniform block layout qualifiers std140, packed, and "
4462 "shared can only be applied to uniform blocks, not "
4466 if (decl
->is_array
) {
4467 field_type
= process_array_type(&loc
, decl_type
, decl
->array_size
,
4470 fields
[i
].type
= field_type
;
4471 fields
[i
].name
= decl
->identifier
;
4473 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
4474 if (!qual
->flags
.q
.uniform
) {
4475 _mesa_glsl_error(&loc
, state
,
4476 "row_major and column_major can only be "
4477 "applied to uniform interface blocks");
4479 validate_matrix_layout_for_type(state
, &loc
, field_type
);
4482 if (qual
->flags
.q
.uniform
&& qual
->has_interpolation()) {
4483 _mesa_glsl_error(&loc
, state
,
4484 "interpolation qualifiers cannot be used "
4485 "with uniform interface blocks");
4488 if (field_type
->is_matrix() ||
4489 (field_type
->is_array() && field_type
->fields
.array
->is_matrix())) {
4490 fields
[i
].row_major
= block_row_major
;
4491 if (qual
->flags
.q
.row_major
)
4492 fields
[i
].row_major
= true;
4493 else if (qual
->flags
.q
.column_major
)
4494 fields
[i
].row_major
= false;
4501 assert(i
== decl_count
);
4503 *fields_ret
= fields
;
4509 ast_struct_specifier::hir(exec_list
*instructions
,
4510 struct _mesa_glsl_parse_state
*state
)
4512 YYLTYPE loc
= this->get_location();
4514 /* Section 4.1.8 (Structures) of the GLSL 1.10 spec says:
4516 * "Anonymous structures are not supported; so embedded structures must
4517 * have a declarator. A name given to an embedded struct is scoped at
4518 * the same level as the struct it is embedded in."
4520 * The same section of the GLSL 1.20 spec says:
4522 * "Anonymous structures are not supported. Embedded structures are not
4525 * struct S { float f; };
4527 * S; // Error: anonymous structures disallowed
4528 * struct { ... }; // Error: embedded structures disallowed
4529 * S s; // Okay: nested structures with name are allowed
4532 * The GLSL ES 1.00 and 3.00 specs have similar langauge and examples. So,
4533 * we allow embedded structures in 1.10 only.
4535 if (state
->language_version
!= 110 && state
->struct_specifier_depth
!= 0)
4536 _mesa_glsl_error(&loc
, state
,
4537 "embedded structure declartions are not allowed");
4539 state
->struct_specifier_depth
++;
4541 glsl_struct_field
*fields
;
4542 unsigned decl_count
=
4543 ast_process_structure_or_interface_block(instructions
,
4545 &this->declarations
,
4551 const glsl_type
*t
=
4552 glsl_type::get_record_instance(fields
, decl_count
, this->name
);
4554 if (!state
->symbols
->add_type(name
, t
)) {
4555 _mesa_glsl_error(& loc
, state
, "struct `%s' previously defined", name
);
4557 const glsl_type
**s
= reralloc(state
, state
->user_structures
,
4559 state
->num_user_structures
+ 1);
4561 s
[state
->num_user_structures
] = t
;
4562 state
->user_structures
= s
;
4563 state
->num_user_structures
++;
4567 state
->struct_specifier_depth
--;
4569 /* Structure type definitions do not have r-values.
4575 ast_interface_block::hir(exec_list
*instructions
,
4576 struct _mesa_glsl_parse_state
*state
)
4578 YYLTYPE loc
= this->get_location();
4580 /* The ast_interface_block has a list of ast_declarator_lists. We
4581 * need to turn those into ir_variables with an association
4582 * with this uniform block.
4584 enum glsl_interface_packing packing
;
4585 if (this->layout
.flags
.q
.shared
) {
4586 packing
= GLSL_INTERFACE_PACKING_SHARED
;
4587 } else if (this->layout
.flags
.q
.packed
) {
4588 packing
= GLSL_INTERFACE_PACKING_PACKED
;
4590 /* The default layout is std140.
4592 packing
= GLSL_INTERFACE_PACKING_STD140
;
4595 bool block_row_major
= this->layout
.flags
.q
.row_major
;
4596 exec_list declared_variables
;
4597 glsl_struct_field
*fields
;
4598 unsigned int num_variables
=
4599 ast_process_structure_or_interface_block(&declared_variables
,
4601 &this->declarations
,
4607 ir_variable_mode var_mode
;
4608 const char *iface_type_name
;
4609 if (this->layout
.flags
.q
.in
) {
4610 var_mode
= ir_var_shader_in
;
4611 iface_type_name
= "in";
4612 } else if (this->layout
.flags
.q
.out
) {
4613 var_mode
= ir_var_shader_out
;
4614 iface_type_name
= "out";
4615 } else if (this->layout
.flags
.q
.uniform
) {
4616 var_mode
= ir_var_uniform
;
4617 iface_type_name
= "uniform";
4619 var_mode
= ir_var_auto
;
4620 iface_type_name
= "UNKNOWN";
4621 assert(!"interface block layout qualifier not found!");
4624 const glsl_type
*block_type
=
4625 glsl_type::get_interface_instance(fields
,
4630 if (!state
->symbols
->add_interface(block_type
->name
, block_type
, var_mode
)) {
4631 YYLTYPE loc
= this->get_location();
4632 _mesa_glsl_error(&loc
, state
, "interface block `%s' with type `%s' "
4633 "already taken in the current scope",
4634 this->block_name
, iface_type_name
);
4637 /* Since interface blocks cannot contain statements, it should be
4638 * impossible for the block to generate any instructions.
4640 assert(declared_variables
.is_empty());
4642 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
4644 * Geometry shader input variables get the per-vertex values written
4645 * out by vertex shader output variables of the same names. Since a
4646 * geometry shader operates on a set of vertices, each input varying
4647 * variable (or input block, see interface blocks below) needs to be
4648 * declared as an array.
4650 if (state
->target
== geometry_shader
&& !this->is_array
&&
4651 var_mode
== ir_var_shader_in
) {
4652 _mesa_glsl_error(&loc
, state
, "geometry shader inputs must be arrays");
4655 /* Page 39 (page 45 of the PDF) of section 4.3.7 in the GLSL ES 3.00 spec
4658 * "If an instance name (instance-name) is used, then it puts all the
4659 * members inside a scope within its own name space, accessed with the
4660 * field selector ( . ) operator (analogously to structures)."
4662 if (this->instance_name
) {
4665 if (this->is_array
) {
4666 /* Section 4.3.7 (Interface Blocks) of the GLSL 1.50 spec says:
4668 * For uniform blocks declared an array, each individual array
4669 * element corresponds to a separate buffer object backing one
4670 * instance of the block. As the array size indicates the number
4671 * of buffer objects needed, uniform block array declarations
4672 * must specify an array size.
4674 * And a few paragraphs later:
4676 * Geometry shader input blocks must be declared as arrays and
4677 * follow the array declaration and linking rules for all
4678 * geometry shader inputs. All other input and output block
4679 * arrays must specify an array size.
4681 * The upshot of this is that the only circumstance where an
4682 * interface array size *doesn't* need to be specified is on a
4683 * geometry shader input.
4685 if (this->array_size
== NULL
&&
4686 (state
->target
!= geometry_shader
|| !this->layout
.flags
.q
.in
)) {
4687 _mesa_glsl_error(&loc
, state
,
4688 "only geometry shader inputs may be unsized "
4689 "instance block arrays");
4693 const glsl_type
*block_array_type
=
4694 process_array_type(&loc
, block_type
, this->array_size
, state
);
4696 var
= new(state
) ir_variable(block_array_type
,
4697 this->instance_name
,
4700 var
= new(state
) ir_variable(block_type
,
4701 this->instance_name
,
4705 var
->interface_type
= block_type
;
4706 if (state
->target
== geometry_shader
&& var_mode
== ir_var_shader_in
)
4707 handle_geometry_shader_input_decl(state
, loc
, var
);
4708 state
->symbols
->add_variable(var
);
4709 instructions
->push_tail(var
);
4711 /* In order to have an array size, the block must also be declared with
4714 assert(!this->is_array
);
4716 for (unsigned i
= 0; i
< num_variables
; i
++) {
4718 new(state
) ir_variable(fields
[i
].type
,
4719 ralloc_strdup(state
, fields
[i
].name
),
4721 var
->interface_type
= block_type
;
4723 /* Propagate the "binding" keyword into this UBO's fields;
4724 * the UBO declaration itself doesn't get an ir_variable unless it
4725 * has an instance name. This is ugly.
4727 var
->explicit_binding
= this->layout
.flags
.q
.explicit_binding
;
4728 var
->binding
= this->layout
.binding
;
4730 state
->symbols
->add_variable(var
);
4731 instructions
->push_tail(var
);
4740 ast_gs_input_layout::hir(exec_list
*instructions
,
4741 struct _mesa_glsl_parse_state
*state
)
4743 YYLTYPE loc
= this->get_location();
4745 /* If any geometry input layout declaration preceded this one, make sure it
4746 * was consistent with this one.
4748 if (state
->gs_input_prim_type_specified
&&
4749 state
->gs_input_prim_type
!= this->prim_type
) {
4750 _mesa_glsl_error(&loc
, state
,
4751 "geometry shader input layout does not match"
4752 " previous declaration");
4756 /* If any shader inputs occurred before this declaration and specified an
4757 * array size, make sure the size they specified is consistent with the
4760 unsigned num_vertices
= vertices_per_prim(this->prim_type
);
4761 if (state
->gs_input_size
!= 0 && state
->gs_input_size
!= num_vertices
) {
4762 _mesa_glsl_error(&loc
, state
,
4763 "this geometry shader input layout implies %u vertices"
4764 " per primitive, but a previous input is declared"
4765 " with size %u", num_vertices
, state
->gs_input_size
);
4769 state
->gs_input_prim_type_specified
= true;
4770 state
->gs_input_prim_type
= this->prim_type
;
4772 /* If any shader inputs occurred before this declaration and did not
4773 * specify an array size, their size is determined now.
4775 foreach_list (node
, instructions
) {
4776 ir_variable
*var
= ((ir_instruction
*) node
)->as_variable();
4777 if (var
== NULL
|| var
->mode
!= ir_var_shader_in
)
4780 /* Note: gl_PrimitiveIDIn has mode ir_var_shader_in, but it's not an
4783 if (!var
->type
->is_array())
4786 if (var
->type
->length
== 0) {
4787 if (var
->max_array_access
>= num_vertices
) {
4788 _mesa_glsl_error(&loc
, state
,
4789 "this geometry shader input layout implies %u"
4790 " vertices, but an access to element %u of input"
4791 " `%s' already exists", num_vertices
,
4792 var
->max_array_access
, var
->name
);
4794 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
4805 detect_conflicting_assignments(struct _mesa_glsl_parse_state
*state
,
4806 exec_list
*instructions
)
4808 bool gl_FragColor_assigned
= false;
4809 bool gl_FragData_assigned
= false;
4810 bool user_defined_fs_output_assigned
= false;
4811 ir_variable
*user_defined_fs_output
= NULL
;
4813 /* It would be nice to have proper location information. */
4815 memset(&loc
, 0, sizeof(loc
));
4817 foreach_list(node
, instructions
) {
4818 ir_variable
*var
= ((ir_instruction
*)node
)->as_variable();
4820 if (!var
|| !var
->assigned
)
4823 if (strcmp(var
->name
, "gl_FragColor") == 0)
4824 gl_FragColor_assigned
= true;
4825 else if (strcmp(var
->name
, "gl_FragData") == 0)
4826 gl_FragData_assigned
= true;
4827 else if (strncmp(var
->name
, "gl_", 3) != 0) {
4828 if (state
->target
== fragment_shader
&&
4829 var
->mode
== ir_var_shader_out
) {
4830 user_defined_fs_output_assigned
= true;
4831 user_defined_fs_output
= var
;
4836 /* From the GLSL 1.30 spec:
4838 * "If a shader statically assigns a value to gl_FragColor, it
4839 * may not assign a value to any element of gl_FragData. If a
4840 * shader statically writes a value to any element of
4841 * gl_FragData, it may not assign a value to
4842 * gl_FragColor. That is, a shader may assign values to either
4843 * gl_FragColor or gl_FragData, but not both. Multiple shaders
4844 * linked together must also consistently write just one of
4845 * these variables. Similarly, if user declared output
4846 * variables are in use (statically assigned to), then the
4847 * built-in variables gl_FragColor and gl_FragData may not be
4848 * assigned to. These incorrect usages all generate compile
4851 if (gl_FragColor_assigned
&& gl_FragData_assigned
) {
4852 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
4853 "`gl_FragColor' and `gl_FragData'");
4854 } else if (gl_FragColor_assigned
&& user_defined_fs_output_assigned
) {
4855 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
4856 "`gl_FragColor' and `%s'",
4857 user_defined_fs_output
->name
);
4858 } else if (gl_FragData_assigned
&& user_defined_fs_output_assigned
) {
4859 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
4860 "`gl_FragData' and `%s'",
4861 user_defined_fs_output
->name
);