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
);
64 remove_per_vertex_blocks(exec_list
*instructions
,
65 _mesa_glsl_parse_state
*state
, ir_variable_mode mode
);
69 _mesa_ast_to_hir(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
)
71 _mesa_glsl_initialize_variables(instructions
, state
);
73 state
->symbols
->separate_function_namespace
= state
->language_version
== 110;
75 state
->current_function
= NULL
;
77 state
->toplevel_ir
= instructions
;
79 state
->gs_input_prim_type_specified
= false;
81 /* Section 4.2 of the GLSL 1.20 specification states:
82 * "The built-in functions are scoped in a scope outside the global scope
83 * users declare global variables in. That is, a shader's global scope,
84 * available for user-defined functions and global variables, is nested
85 * inside the scope containing the built-in functions."
87 * Since built-in functions like ftransform() access built-in variables,
88 * it follows that those must be in the outer scope as well.
90 * We push scope here to create this nesting effect...but don't pop.
91 * This way, a shader's globals are still in the symbol table for use
94 state
->symbols
->push_scope();
96 foreach_list_typed (ast_node
, ast
, link
, & state
->translation_unit
)
97 ast
->hir(instructions
, state
);
99 detect_recursion_unlinked(state
, instructions
);
100 detect_conflicting_assignments(state
, instructions
);
102 state
->toplevel_ir
= NULL
;
104 /* Move all of the variable declarations to the front of the IR list, and
105 * reverse the order. This has the (intended!) side effect that vertex
106 * shader inputs and fragment shader outputs will appear in the IR in the
107 * same order that they appeared in the shader code. This results in the
108 * locations being assigned in the declared order. Many (arguably buggy)
109 * applications depend on this behavior, and it matches what nearly all
112 foreach_list_safe(node
, instructions
) {
113 ir_variable
*const var
= ((ir_instruction
*) node
)->as_variable();
119 instructions
->push_head(var
);
122 /* From section 7.1 (Built-In Language Variables) of the GLSL 4.10 spec:
124 * If multiple shaders using members of a built-in block belonging to
125 * the same interface are linked together in the same program, they
126 * must all redeclare the built-in block in the same way, as described
127 * in section 4.3.7 "Interface Blocks" for interface block matching, or
128 * a link error will result.
130 * The phrase "using members of a built-in block" implies that if two
131 * shaders are linked together and one of them *does not use* any members
132 * of the built-in block, then that shader does not need to have a matching
133 * redeclaration of the built-in block.
135 * This appears to be a clarification to the behaviour established for
136 * gl_PerVertex by GLSL 1.50, therefore implement it regardless of GLSL
139 * The definition of "interface" in section 4.3.7 that applies here is as
142 * The boundary between adjacent programmable pipeline stages: This
143 * spans all the outputs in all compilation units of the first stage
144 * and all the inputs in all compilation units of the second stage.
146 * Therefore this rule applies to both inter- and intra-stage linking.
148 * The easiest way to implement this is to check whether the shader uses
149 * gl_PerVertex right after ast-to-ir conversion, and if it doesn't, simply
150 * remove all the relevant variable declaration from the IR, so that the
151 * linker won't see them and complain about mismatches.
153 remove_per_vertex_blocks(instructions
, state
, ir_var_shader_in
);
154 remove_per_vertex_blocks(instructions
, state
, ir_var_shader_out
);
159 * If a conversion is available, convert one operand to a different type
161 * The \c from \c ir_rvalue is converted "in place".
163 * \param to Type that the operand it to be converted to
164 * \param from Operand that is being converted
165 * \param state GLSL compiler state
168 * If a conversion is possible (or unnecessary), \c true is returned.
169 * Otherwise \c false is returned.
172 apply_implicit_conversion(const glsl_type
*to
, ir_rvalue
* &from
,
173 struct _mesa_glsl_parse_state
*state
)
176 if (to
->base_type
== from
->type
->base_type
)
179 /* This conversion was added in GLSL 1.20. If the compilation mode is
180 * GLSL 1.10, the conversion is skipped.
182 if (!state
->is_version(120, 0))
185 /* From page 27 (page 33 of the PDF) of the GLSL 1.50 spec:
187 * "There are no implicit array or structure conversions. For
188 * example, an array of int cannot be implicitly converted to an
189 * array of float. There are no implicit conversions between
190 * signed and unsigned integers."
192 /* FINISHME: The above comment is partially a lie. There is int/uint
193 * FINISHME: conversion for immediate constants.
195 if (!to
->is_float() || !from
->type
->is_numeric())
198 /* Convert to a floating point type with the same number of components
199 * as the original type - i.e. int to float, not int to vec4.
201 to
= glsl_type::get_instance(GLSL_TYPE_FLOAT
, from
->type
->vector_elements
,
202 from
->type
->matrix_columns
);
204 switch (from
->type
->base_type
) {
206 from
= new(ctx
) ir_expression(ir_unop_i2f
, to
, from
, NULL
);
209 from
= new(ctx
) ir_expression(ir_unop_u2f
, to
, from
, NULL
);
212 from
= new(ctx
) ir_expression(ir_unop_b2f
, to
, from
, NULL
);
222 static const struct glsl_type
*
223 arithmetic_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
225 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
227 const glsl_type
*type_a
= value_a
->type
;
228 const glsl_type
*type_b
= value_b
->type
;
230 /* From GLSL 1.50 spec, page 56:
232 * "The arithmetic binary operators add (+), subtract (-),
233 * multiply (*), and divide (/) operate on integer and
234 * floating-point scalars, vectors, and matrices."
236 if (!type_a
->is_numeric() || !type_b
->is_numeric()) {
237 _mesa_glsl_error(loc
, state
,
238 "operands to arithmetic operators must be numeric");
239 return glsl_type::error_type
;
243 /* "If one operand is floating-point based and the other is
244 * not, then the conversions from Section 4.1.10 "Implicit
245 * Conversions" are applied to the non-floating-point-based operand."
247 if (!apply_implicit_conversion(type_a
, value_b
, state
)
248 && !apply_implicit_conversion(type_b
, value_a
, state
)) {
249 _mesa_glsl_error(loc
, state
,
250 "could not implicitly convert operands to "
251 "arithmetic operator");
252 return glsl_type::error_type
;
254 type_a
= value_a
->type
;
255 type_b
= value_b
->type
;
257 /* "If the operands are integer types, they must both be signed or
260 * From this rule and the preceeding conversion it can be inferred that
261 * both types must be GLSL_TYPE_FLOAT, or GLSL_TYPE_UINT, or GLSL_TYPE_INT.
262 * The is_numeric check above already filtered out the case where either
263 * type is not one of these, so now the base types need only be tested for
266 if (type_a
->base_type
!= type_b
->base_type
) {
267 _mesa_glsl_error(loc
, state
,
268 "base type mismatch for arithmetic operator");
269 return glsl_type::error_type
;
272 /* "All arithmetic binary operators result in the same fundamental type
273 * (signed integer, unsigned integer, or floating-point) as the
274 * operands they operate on, after operand type conversion. After
275 * conversion, the following cases are valid
277 * * The two operands are scalars. In this case the operation is
278 * applied, resulting in a scalar."
280 if (type_a
->is_scalar() && type_b
->is_scalar())
283 /* "* One operand is a scalar, and the other is a vector or matrix.
284 * In this case, the scalar operation is applied independently to each
285 * component of the vector or matrix, resulting in the same size
288 if (type_a
->is_scalar()) {
289 if (!type_b
->is_scalar())
291 } else if (type_b
->is_scalar()) {
295 /* All of the combinations of <scalar, scalar>, <vector, scalar>,
296 * <scalar, vector>, <scalar, matrix>, and <matrix, scalar> have been
299 assert(!type_a
->is_scalar());
300 assert(!type_b
->is_scalar());
302 /* "* The two operands are vectors of the same size. In this case, the
303 * operation is done component-wise resulting in the same size
306 if (type_a
->is_vector() && type_b
->is_vector()) {
307 if (type_a
== type_b
) {
310 _mesa_glsl_error(loc
, state
,
311 "vector size mismatch for arithmetic operator");
312 return glsl_type::error_type
;
316 /* All of the combinations of <scalar, scalar>, <vector, scalar>,
317 * <scalar, vector>, <scalar, matrix>, <matrix, scalar>, and
318 * <vector, vector> have been handled. At least one of the operands must
319 * be matrix. Further, since there are no integer matrix types, the base
320 * type of both operands must be float.
322 assert(type_a
->is_matrix() || type_b
->is_matrix());
323 assert(type_a
->base_type
== GLSL_TYPE_FLOAT
);
324 assert(type_b
->base_type
== GLSL_TYPE_FLOAT
);
326 /* "* The operator is add (+), subtract (-), or divide (/), and the
327 * operands are matrices with the same number of rows and the same
328 * number of columns. In this case, the operation is done component-
329 * wise resulting in the same size matrix."
330 * * The operator is multiply (*), where both operands are matrices or
331 * one operand is a vector and the other a matrix. A right vector
332 * operand is treated as a column vector and a left vector operand as a
333 * row vector. In all these cases, it is required that the number of
334 * columns of the left operand is equal to the number of rows of the
335 * right operand. Then, the multiply (*) operation does a linear
336 * algebraic multiply, yielding an object that has the same number of
337 * rows as the left operand and the same number of columns as the right
338 * operand. Section 5.10 "Vector and Matrix Operations" explains in
339 * more detail how vectors and matrices are operated on."
342 if (type_a
== type_b
)
345 if (type_a
->is_matrix() && type_b
->is_matrix()) {
346 /* Matrix multiply. The columns of A must match the rows of B. Given
347 * the other previously tested constraints, this means the vector type
348 * of a row from A must be the same as the vector type of a column from
351 if (type_a
->row_type() == type_b
->column_type()) {
352 /* The resulting matrix has the number of columns of matrix B and
353 * the number of rows of matrix A. We get the row count of A by
354 * looking at the size of a vector that makes up a column. The
355 * transpose (size of a row) is done for B.
357 const glsl_type
*const type
=
358 glsl_type::get_instance(type_a
->base_type
,
359 type_a
->column_type()->vector_elements
,
360 type_b
->row_type()->vector_elements
);
361 assert(type
!= glsl_type::error_type
);
365 } else if (type_a
->is_matrix()) {
366 /* A is a matrix and B is a column vector. Columns of A must match
367 * rows of B. Given the other previously tested constraints, this
368 * means the vector type of a row from A must be the same as the
369 * vector the type of B.
371 if (type_a
->row_type() == type_b
) {
372 /* The resulting vector has a number of elements equal to
373 * the number of rows of matrix A. */
374 const glsl_type
*const type
=
375 glsl_type::get_instance(type_a
->base_type
,
376 type_a
->column_type()->vector_elements
,
378 assert(type
!= glsl_type::error_type
);
383 assert(type_b
->is_matrix());
385 /* A is a row vector and B is a matrix. Columns of A must match rows
386 * of B. Given the other previously tested constraints, this means
387 * the type of A must be the same as the vector type of a column from
390 if (type_a
== type_b
->column_type()) {
391 /* The resulting vector has a number of elements equal to
392 * the number of columns of matrix B. */
393 const glsl_type
*const type
=
394 glsl_type::get_instance(type_a
->base_type
,
395 type_b
->row_type()->vector_elements
,
397 assert(type
!= glsl_type::error_type
);
403 _mesa_glsl_error(loc
, state
, "size mismatch for matrix multiplication");
404 return glsl_type::error_type
;
408 /* "All other cases are illegal."
410 _mesa_glsl_error(loc
, state
, "type mismatch");
411 return glsl_type::error_type
;
415 static const struct glsl_type
*
416 unary_arithmetic_result_type(const struct glsl_type
*type
,
417 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
419 /* From GLSL 1.50 spec, page 57:
421 * "The arithmetic unary operators negate (-), post- and pre-increment
422 * and decrement (-- and ++) operate on integer or floating-point
423 * values (including vectors and matrices). All unary operators work
424 * component-wise on their operands. These result with the same type
427 if (!type
->is_numeric()) {
428 _mesa_glsl_error(loc
, state
,
429 "operands to arithmetic operators must be numeric");
430 return glsl_type::error_type
;
437 * \brief Return the result type of a bit-logic operation.
439 * If the given types to the bit-logic operator are invalid, return
440 * glsl_type::error_type.
442 * \param type_a Type of LHS of bit-logic op
443 * \param type_b Type of RHS of bit-logic op
445 static const struct glsl_type
*
446 bit_logic_result_type(const struct glsl_type
*type_a
,
447 const struct glsl_type
*type_b
,
449 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
451 if (!state
->check_bitwise_operations_allowed(loc
)) {
452 return glsl_type::error_type
;
455 /* From page 50 (page 56 of PDF) of GLSL 1.30 spec:
457 * "The bitwise operators and (&), exclusive-or (^), and inclusive-or
458 * (|). The operands must be of type signed or unsigned integers or
461 if (!type_a
->is_integer()) {
462 _mesa_glsl_error(loc
, state
, "LHS of `%s' must be an integer",
463 ast_expression::operator_string(op
));
464 return glsl_type::error_type
;
466 if (!type_b
->is_integer()) {
467 _mesa_glsl_error(loc
, state
, "RHS of `%s' must be an integer",
468 ast_expression::operator_string(op
));
469 return glsl_type::error_type
;
472 /* "The fundamental types of the operands (signed or unsigned) must
475 if (type_a
->base_type
!= type_b
->base_type
) {
476 _mesa_glsl_error(loc
, state
, "operands of `%s' must have the same "
477 "base type", ast_expression::operator_string(op
));
478 return glsl_type::error_type
;
481 /* "The operands cannot be vectors of differing size." */
482 if (type_a
->is_vector() &&
483 type_b
->is_vector() &&
484 type_a
->vector_elements
!= type_b
->vector_elements
) {
485 _mesa_glsl_error(loc
, state
, "operands of `%s' cannot be vectors of "
486 "different sizes", ast_expression::operator_string(op
));
487 return glsl_type::error_type
;
490 /* "If one operand is a scalar and the other a vector, the scalar is
491 * applied component-wise to the vector, resulting in the same type as
492 * the vector. The fundamental types of the operands [...] will be the
493 * resulting fundamental type."
495 if (type_a
->is_scalar())
501 static const struct glsl_type
*
502 modulus_result_type(const struct glsl_type
*type_a
,
503 const struct glsl_type
*type_b
,
504 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
506 if (!state
->check_version(130, 300, loc
, "operator '%%' is reserved")) {
507 return glsl_type::error_type
;
510 /* From GLSL 1.50 spec, page 56:
511 * "The operator modulus (%) operates on signed or unsigned integers or
512 * integer vectors. The operand types must both be signed or both be
515 if (!type_a
->is_integer()) {
516 _mesa_glsl_error(loc
, state
, "LHS of operator %% must be an integer");
517 return glsl_type::error_type
;
519 if (!type_b
->is_integer()) {
520 _mesa_glsl_error(loc
, state
, "RHS of operator %% must be an integer");
521 return glsl_type::error_type
;
523 if (type_a
->base_type
!= type_b
->base_type
) {
524 _mesa_glsl_error(loc
, state
,
525 "operands of %% must have the same base type");
526 return glsl_type::error_type
;
529 /* "The operands cannot be vectors of differing size. If one operand is
530 * a scalar and the other vector, then the scalar is applied component-
531 * wise to the vector, resulting in the same type as the vector. If both
532 * are vectors of the same size, the result is computed component-wise."
534 if (type_a
->is_vector()) {
535 if (!type_b
->is_vector()
536 || (type_a
->vector_elements
== type_b
->vector_elements
))
541 /* "The operator modulus (%) is not defined for any other data types
542 * (non-integer types)."
544 _mesa_glsl_error(loc
, state
, "type mismatch");
545 return glsl_type::error_type
;
549 static const struct glsl_type
*
550 relational_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
551 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
553 const glsl_type
*type_a
= value_a
->type
;
554 const glsl_type
*type_b
= value_b
->type
;
556 /* From GLSL 1.50 spec, page 56:
557 * "The relational operators greater than (>), less than (<), greater
558 * than or equal (>=), and less than or equal (<=) operate only on
559 * scalar integer and scalar floating-point expressions."
561 if (!type_a
->is_numeric()
562 || !type_b
->is_numeric()
563 || !type_a
->is_scalar()
564 || !type_b
->is_scalar()) {
565 _mesa_glsl_error(loc
, state
,
566 "operands to relational operators must be scalar and "
568 return glsl_type::error_type
;
571 /* "Either the operands' types must match, or the conversions from
572 * Section 4.1.10 "Implicit Conversions" will be applied to the integer
573 * operand, after which the types must match."
575 if (!apply_implicit_conversion(type_a
, value_b
, state
)
576 && !apply_implicit_conversion(type_b
, value_a
, state
)) {
577 _mesa_glsl_error(loc
, state
,
578 "could not implicitly convert operands to "
579 "relational operator");
580 return glsl_type::error_type
;
582 type_a
= value_a
->type
;
583 type_b
= value_b
->type
;
585 if (type_a
->base_type
!= type_b
->base_type
) {
586 _mesa_glsl_error(loc
, state
, "base type mismatch");
587 return glsl_type::error_type
;
590 /* "The result is scalar Boolean."
592 return glsl_type::bool_type
;
596 * \brief Return the result type of a bit-shift operation.
598 * If the given types to the bit-shift operator are invalid, return
599 * glsl_type::error_type.
601 * \param type_a Type of LHS of bit-shift op
602 * \param type_b Type of RHS of bit-shift op
604 static const struct glsl_type
*
605 shift_result_type(const struct glsl_type
*type_a
,
606 const struct glsl_type
*type_b
,
608 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
610 if (!state
->check_bitwise_operations_allowed(loc
)) {
611 return glsl_type::error_type
;
614 /* From page 50 (page 56 of the PDF) of the GLSL 1.30 spec:
616 * "The shift operators (<<) and (>>). For both operators, the operands
617 * must be signed or unsigned integers or integer vectors. One operand
618 * can be signed while the other is unsigned."
620 if (!type_a
->is_integer()) {
621 _mesa_glsl_error(loc
, state
, "LHS of operator %s must be an integer or "
622 "integer vector", ast_expression::operator_string(op
));
623 return glsl_type::error_type
;
626 if (!type_b
->is_integer()) {
627 _mesa_glsl_error(loc
, state
, "RHS of operator %s must be an integer or "
628 "integer vector", ast_expression::operator_string(op
));
629 return glsl_type::error_type
;
632 /* "If the first operand is a scalar, the second operand has to be
635 if (type_a
->is_scalar() && !type_b
->is_scalar()) {
636 _mesa_glsl_error(loc
, state
, "if the first operand of %s is scalar, the "
637 "second must be scalar as well",
638 ast_expression::operator_string(op
));
639 return glsl_type::error_type
;
642 /* If both operands are vectors, check that they have same number of
645 if (type_a
->is_vector() &&
646 type_b
->is_vector() &&
647 type_a
->vector_elements
!= type_b
->vector_elements
) {
648 _mesa_glsl_error(loc
, state
, "vector operands to operator %s must "
649 "have same number of elements",
650 ast_expression::operator_string(op
));
651 return glsl_type::error_type
;
654 /* "In all cases, the resulting type will be the same type as the left
661 * Validates that a value can be assigned to a location with a specified type
663 * Validates that \c rhs can be assigned to some location. If the types are
664 * not an exact match but an automatic conversion is possible, \c rhs will be
668 * \c NULL if \c rhs cannot be assigned to a location with type \c lhs_type.
669 * Otherwise the actual RHS to be assigned will be returned. This may be
670 * \c rhs, or it may be \c rhs after some type conversion.
673 * In addition to being used for assignments, this function is used to
674 * type-check return values.
677 validate_assignment(struct _mesa_glsl_parse_state
*state
,
678 YYLTYPE loc
, const glsl_type
*lhs_type
,
679 ir_rvalue
*rhs
, bool is_initializer
)
681 /* If there is already some error in the RHS, just return it. Anything
682 * else will lead to an avalanche of error message back to the user.
684 if (rhs
->type
->is_error())
687 /* If the types are identical, the assignment can trivially proceed.
689 if (rhs
->type
== lhs_type
)
692 /* If the array element types are the same and the LHS is unsized,
693 * the assignment is okay for initializers embedded in variable
696 * Note: Whole-array assignments are not permitted in GLSL 1.10, but this
697 * is handled by ir_dereference::is_lvalue.
699 if (is_initializer
&& lhs_type
->is_unsized_array() && rhs
->type
->is_array()
700 && (lhs_type
->element_type() == rhs
->type
->element_type())) {
704 /* Check for implicit conversion in GLSL 1.20 */
705 if (apply_implicit_conversion(lhs_type
, rhs
, state
)) {
706 if (rhs
->type
== lhs_type
)
710 _mesa_glsl_error(&loc
, state
,
711 "%s of type %s cannot be assigned to "
712 "variable of type %s",
713 is_initializer
? "initializer" : "value",
714 rhs
->type
->name
, lhs_type
->name
);
720 mark_whole_array_access(ir_rvalue
*access
)
722 ir_dereference_variable
*deref
= access
->as_dereference_variable();
724 if (deref
&& deref
->var
) {
725 deref
->var
->max_array_access
= deref
->type
->length
- 1;
730 do_assignment(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
,
731 const char *non_lvalue_description
,
732 ir_rvalue
*lhs
, ir_rvalue
*rhs
, bool is_initializer
,
736 bool error_emitted
= (lhs
->type
->is_error() || rhs
->type
->is_error());
738 /* If the assignment LHS comes back as an ir_binop_vector_extract
739 * expression, move it to the RHS as an ir_triop_vector_insert.
741 if (lhs
->ir_type
== ir_type_expression
) {
742 ir_expression
*const expr
= lhs
->as_expression();
744 if (unlikely(expr
->operation
== ir_binop_vector_extract
)) {
746 validate_assignment(state
, lhs_loc
, lhs
->type
,
747 rhs
, is_initializer
);
749 if (new_rhs
== NULL
) {
752 rhs
= new(ctx
) ir_expression(ir_triop_vector_insert
,
753 expr
->operands
[0]->type
,
757 lhs
= expr
->operands
[0]->clone(ctx
, NULL
);
762 ir_variable
*lhs_var
= lhs
->variable_referenced();
764 lhs_var
->assigned
= true;
766 if (!error_emitted
) {
767 if (non_lvalue_description
!= NULL
) {
768 _mesa_glsl_error(&lhs_loc
, state
,
770 non_lvalue_description
);
771 error_emitted
= true;
772 } else if (lhs
->variable_referenced() != NULL
773 && lhs
->variable_referenced()->read_only
) {
774 _mesa_glsl_error(&lhs_loc
, state
,
775 "assignment to read-only variable '%s'",
776 lhs
->variable_referenced()->name
);
777 error_emitted
= true;
779 } else if (lhs
->type
->is_array() &&
780 !state
->check_version(120, 300, &lhs_loc
,
781 "whole array assignment forbidden")) {
782 /* From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
784 * "Other binary or unary expressions, non-dereferenced
785 * arrays, function names, swizzles with repeated fields,
786 * and constants cannot be l-values."
788 * The restriction on arrays is lifted in GLSL 1.20 and GLSL ES 3.00.
790 error_emitted
= true;
791 } else if (!lhs
->is_lvalue()) {
792 _mesa_glsl_error(& lhs_loc
, state
, "non-lvalue in assignment");
793 error_emitted
= true;
798 validate_assignment(state
, lhs_loc
, lhs
->type
, rhs
, is_initializer
);
799 if (new_rhs
!= NULL
) {
802 /* If the LHS array was not declared with a size, it takes it size from
803 * the RHS. If the LHS is an l-value and a whole array, it must be a
804 * dereference of a variable. Any other case would require that the LHS
805 * is either not an l-value or not a whole array.
807 if (lhs
->type
->is_unsized_array()) {
808 ir_dereference
*const d
= lhs
->as_dereference();
812 ir_variable
*const var
= d
->variable_referenced();
816 if (var
->max_array_access
>= unsigned(rhs
->type
->array_size())) {
817 /* FINISHME: This should actually log the location of the RHS. */
818 _mesa_glsl_error(& lhs_loc
, state
, "array size must be > %u due to "
820 var
->max_array_access
);
823 var
->type
= glsl_type::get_array_instance(lhs
->type
->element_type(),
824 rhs
->type
->array_size());
827 mark_whole_array_access(rhs
);
828 mark_whole_array_access(lhs
);
831 /* Most callers of do_assignment (assign, add_assign, pre_inc/dec,
832 * but not post_inc) need the converted assigned value as an rvalue
833 * to handle things like:
837 * So we always just store the computed value being assigned to a
838 * temporary and return a deref of that temporary. If the rvalue
839 * ends up not being used, the temp will get copy-propagated out.
841 ir_variable
*var
= new(ctx
) ir_variable(rhs
->type
, "assignment_tmp",
843 ir_dereference_variable
*deref_var
= new(ctx
) ir_dereference_variable(var
);
844 instructions
->push_tail(var
);
845 instructions
->push_tail(new(ctx
) ir_assignment(deref_var
, rhs
));
846 deref_var
= new(ctx
) ir_dereference_variable(var
);
849 instructions
->push_tail(new(ctx
) ir_assignment(lhs
, deref_var
));
851 return new(ctx
) ir_dereference_variable(var
);
855 get_lvalue_copy(exec_list
*instructions
, ir_rvalue
*lvalue
)
857 void *ctx
= ralloc_parent(lvalue
);
860 var
= new(ctx
) ir_variable(lvalue
->type
, "_post_incdec_tmp",
862 instructions
->push_tail(var
);
863 var
->mode
= ir_var_auto
;
865 instructions
->push_tail(new(ctx
) ir_assignment(new(ctx
) ir_dereference_variable(var
),
868 return new(ctx
) ir_dereference_variable(var
);
873 ast_node::hir(exec_list
*instructions
,
874 struct _mesa_glsl_parse_state
*state
)
883 do_comparison(void *mem_ctx
, int operation
, ir_rvalue
*op0
, ir_rvalue
*op1
)
886 ir_rvalue
*cmp
= NULL
;
888 if (operation
== ir_binop_all_equal
)
889 join_op
= ir_binop_logic_and
;
891 join_op
= ir_binop_logic_or
;
893 switch (op0
->type
->base_type
) {
894 case GLSL_TYPE_FLOAT
:
898 return new(mem_ctx
) ir_expression(operation
, op0
, op1
);
900 case GLSL_TYPE_ARRAY
: {
901 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
902 ir_rvalue
*e0
, *e1
, *result
;
904 e0
= new(mem_ctx
) ir_dereference_array(op0
->clone(mem_ctx
, NULL
),
905 new(mem_ctx
) ir_constant(i
));
906 e1
= new(mem_ctx
) ir_dereference_array(op1
->clone(mem_ctx
, NULL
),
907 new(mem_ctx
) ir_constant(i
));
908 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
911 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
917 mark_whole_array_access(op0
);
918 mark_whole_array_access(op1
);
922 case GLSL_TYPE_STRUCT
: {
923 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
924 ir_rvalue
*e0
, *e1
, *result
;
925 const char *field_name
= op0
->type
->fields
.structure
[i
].name
;
927 e0
= new(mem_ctx
) ir_dereference_record(op0
->clone(mem_ctx
, NULL
),
929 e1
= new(mem_ctx
) ir_dereference_record(op1
->clone(mem_ctx
, NULL
),
931 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
934 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
942 case GLSL_TYPE_ERROR
:
944 case GLSL_TYPE_SAMPLER
:
945 case GLSL_TYPE_INTERFACE
:
946 case GLSL_TYPE_ATOMIC_UINT
:
947 /* I assume a comparison of a struct containing a sampler just
948 * ignores the sampler present in the type.
954 cmp
= new(mem_ctx
) ir_constant(true);
959 /* For logical operations, we want to ensure that the operands are
960 * scalar booleans. If it isn't, emit an error and return a constant
961 * boolean to avoid triggering cascading error messages.
964 get_scalar_boolean_operand(exec_list
*instructions
,
965 struct _mesa_glsl_parse_state
*state
,
966 ast_expression
*parent_expr
,
968 const char *operand_name
,
971 ast_expression
*expr
= parent_expr
->subexpressions
[operand
];
973 ir_rvalue
*val
= expr
->hir(instructions
, state
);
975 if (val
->type
->is_boolean() && val
->type
->is_scalar())
978 if (!*error_emitted
) {
979 YYLTYPE loc
= expr
->get_location();
980 _mesa_glsl_error(&loc
, state
, "%s of `%s' must be scalar boolean",
982 parent_expr
->operator_string(parent_expr
->oper
));
983 *error_emitted
= true;
986 return new(ctx
) ir_constant(true);
990 * If name refers to a builtin array whose maximum allowed size is less than
991 * size, report an error and return true. Otherwise return false.
994 check_builtin_array_max_size(const char *name
, unsigned size
,
995 YYLTYPE loc
, struct _mesa_glsl_parse_state
*state
)
997 if ((strcmp("gl_TexCoord", name
) == 0)
998 && (size
> state
->Const
.MaxTextureCoords
)) {
999 /* From page 54 (page 60 of the PDF) of the GLSL 1.20 spec:
1001 * "The size [of gl_TexCoord] can be at most
1002 * gl_MaxTextureCoords."
1004 _mesa_glsl_error(&loc
, state
, "`gl_TexCoord' array size cannot "
1005 "be larger than gl_MaxTextureCoords (%u)",
1006 state
->Const
.MaxTextureCoords
);
1007 } else if (strcmp("gl_ClipDistance", name
) == 0
1008 && size
> state
->Const
.MaxClipPlanes
) {
1009 /* From section 7.1 (Vertex Shader Special Variables) of the
1012 * "The gl_ClipDistance array is predeclared as unsized and
1013 * must be sized by the shader either redeclaring it with a
1014 * size or indexing it only with integral constant
1015 * expressions. ... The size can be at most
1016 * gl_MaxClipDistances."
1018 _mesa_glsl_error(&loc
, state
, "`gl_ClipDistance' array size cannot "
1019 "be larger than gl_MaxClipDistances (%u)",
1020 state
->Const
.MaxClipPlanes
);
1025 * Create the constant 1, of a which is appropriate for incrementing and
1026 * decrementing values of the given GLSL type. For example, if type is vec4,
1027 * this creates a constant value of 1.0 having type float.
1029 * If the given type is invalid for increment and decrement operators, return
1030 * a floating point 1--the error will be detected later.
1033 constant_one_for_inc_dec(void *ctx
, const glsl_type
*type
)
1035 switch (type
->base_type
) {
1036 case GLSL_TYPE_UINT
:
1037 return new(ctx
) ir_constant((unsigned) 1);
1039 return new(ctx
) ir_constant(1);
1041 case GLSL_TYPE_FLOAT
:
1042 return new(ctx
) ir_constant(1.0f
);
1047 ast_expression::hir(exec_list
*instructions
,
1048 struct _mesa_glsl_parse_state
*state
)
1051 static const int operations
[AST_NUM_OPERATORS
] = {
1052 -1, /* ast_assign doesn't convert to ir_expression. */
1053 -1, /* ast_plus doesn't convert to ir_expression. */
1067 ir_binop_any_nequal
,
1077 /* Note: The following block of expression types actually convert
1078 * to multiple IR instructions.
1080 ir_binop_mul
, /* ast_mul_assign */
1081 ir_binop_div
, /* ast_div_assign */
1082 ir_binop_mod
, /* ast_mod_assign */
1083 ir_binop_add
, /* ast_add_assign */
1084 ir_binop_sub
, /* ast_sub_assign */
1085 ir_binop_lshift
, /* ast_ls_assign */
1086 ir_binop_rshift
, /* ast_rs_assign */
1087 ir_binop_bit_and
, /* ast_and_assign */
1088 ir_binop_bit_xor
, /* ast_xor_assign */
1089 ir_binop_bit_or
, /* ast_or_assign */
1091 -1, /* ast_conditional doesn't convert to ir_expression. */
1092 ir_binop_add
, /* ast_pre_inc. */
1093 ir_binop_sub
, /* ast_pre_dec. */
1094 ir_binop_add
, /* ast_post_inc. */
1095 ir_binop_sub
, /* ast_post_dec. */
1096 -1, /* ast_field_selection doesn't conv to ir_expression. */
1097 -1, /* ast_array_index doesn't convert to ir_expression. */
1098 -1, /* ast_function_call doesn't conv to ir_expression. */
1099 -1, /* ast_identifier doesn't convert to ir_expression. */
1100 -1, /* ast_int_constant doesn't convert to ir_expression. */
1101 -1, /* ast_uint_constant doesn't conv to ir_expression. */
1102 -1, /* ast_float_constant doesn't conv to ir_expression. */
1103 -1, /* ast_bool_constant doesn't conv to ir_expression. */
1104 -1, /* ast_sequence doesn't convert to ir_expression. */
1106 ir_rvalue
*result
= NULL
;
1108 const struct glsl_type
*type
; /* a temporary variable for switch cases */
1109 bool error_emitted
= false;
1112 loc
= this->get_location();
1114 switch (this->oper
) {
1116 assert(!"ast_aggregate: Should never get here.");
1120 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1121 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1123 result
= do_assignment(instructions
, state
,
1124 this->subexpressions
[0]->non_lvalue_description
,
1125 op
[0], op
[1], false,
1126 this->subexpressions
[0]->get_location());
1127 error_emitted
= result
->type
->is_error();
1132 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1134 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1136 error_emitted
= type
->is_error();
1142 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1144 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1146 error_emitted
= type
->is_error();
1148 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1156 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1157 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1159 type
= arithmetic_result_type(op
[0], op
[1],
1160 (this->oper
== ast_mul
),
1162 error_emitted
= type
->is_error();
1164 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1169 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1170 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1172 type
= modulus_result_type(op
[0]->type
, op
[1]->type
, state
, & loc
);
1174 assert(operations
[this->oper
] == ir_binop_mod
);
1176 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1178 error_emitted
= type
->is_error();
1183 if (!state
->check_bitwise_operations_allowed(&loc
)) {
1184 error_emitted
= true;
1187 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1188 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1189 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1191 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1193 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1200 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1201 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1203 type
= relational_result_type(op
[0], op
[1], state
, & loc
);
1205 /* The relational operators must either generate an error or result
1206 * in a scalar boolean. See page 57 of the GLSL 1.50 spec.
1208 assert(type
->is_error()
1209 || ((type
->base_type
== GLSL_TYPE_BOOL
)
1210 && type
->is_scalar()));
1212 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1214 error_emitted
= type
->is_error();
1219 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1220 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1222 /* From page 58 (page 64 of the PDF) of the GLSL 1.50 spec:
1224 * "The equality operators equal (==), and not equal (!=)
1225 * operate on all types. They result in a scalar Boolean. If
1226 * the operand types do not match, then there must be a
1227 * conversion from Section 4.1.10 "Implicit Conversions"
1228 * applied to one operand that can make them match, in which
1229 * case this conversion is done."
1231 if ((!apply_implicit_conversion(op
[0]->type
, op
[1], state
)
1232 && !apply_implicit_conversion(op
[1]->type
, op
[0], state
))
1233 || (op
[0]->type
!= op
[1]->type
)) {
1234 _mesa_glsl_error(& loc
, state
, "operands of `%s' must have the same "
1235 "type", (this->oper
== ast_equal
) ? "==" : "!=");
1236 error_emitted
= true;
1237 } else if ((op
[0]->type
->is_array() || op
[1]->type
->is_array()) &&
1238 !state
->check_version(120, 300, &loc
,
1239 "array comparisons forbidden")) {
1240 error_emitted
= true;
1241 } else if ((op
[0]->type
->contains_opaque() ||
1242 op
[1]->type
->contains_opaque())) {
1243 _mesa_glsl_error(&loc
, state
, "opaque type comparisons forbidden");
1244 error_emitted
= true;
1247 if (error_emitted
) {
1248 result
= new(ctx
) ir_constant(false);
1250 result
= do_comparison(ctx
, operations
[this->oper
], op
[0], op
[1]);
1251 assert(result
->type
== glsl_type::bool_type
);
1258 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1259 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1260 type
= bit_logic_result_type(op
[0]->type
, op
[1]->type
, this->oper
,
1262 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1264 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1268 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1270 if (!state
->check_bitwise_operations_allowed(&loc
)) {
1271 error_emitted
= true;
1274 if (!op
[0]->type
->is_integer()) {
1275 _mesa_glsl_error(&loc
, state
, "operand of `~' must be an integer");
1276 error_emitted
= true;
1279 type
= error_emitted
? glsl_type::error_type
: op
[0]->type
;
1280 result
= new(ctx
) ir_expression(ir_unop_bit_not
, type
, op
[0], NULL
);
1283 case ast_logic_and
: {
1284 exec_list rhs_instructions
;
1285 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1286 "LHS", &error_emitted
);
1287 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1288 "RHS", &error_emitted
);
1290 if (rhs_instructions
.is_empty()) {
1291 result
= new(ctx
) ir_expression(ir_binop_logic_and
, op
[0], op
[1]);
1292 type
= result
->type
;
1294 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1297 instructions
->push_tail(tmp
);
1299 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1300 instructions
->push_tail(stmt
);
1302 stmt
->then_instructions
.append_list(&rhs_instructions
);
1303 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1304 ir_assignment
*const then_assign
=
1305 new(ctx
) ir_assignment(then_deref
, op
[1]);
1306 stmt
->then_instructions
.push_tail(then_assign
);
1308 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1309 ir_assignment
*const else_assign
=
1310 new(ctx
) ir_assignment(else_deref
, new(ctx
) ir_constant(false));
1311 stmt
->else_instructions
.push_tail(else_assign
);
1313 result
= new(ctx
) ir_dereference_variable(tmp
);
1319 case ast_logic_or
: {
1320 exec_list rhs_instructions
;
1321 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1322 "LHS", &error_emitted
);
1323 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1324 "RHS", &error_emitted
);
1326 if (rhs_instructions
.is_empty()) {
1327 result
= new(ctx
) ir_expression(ir_binop_logic_or
, op
[0], op
[1]);
1328 type
= result
->type
;
1330 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1333 instructions
->push_tail(tmp
);
1335 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1336 instructions
->push_tail(stmt
);
1338 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1339 ir_assignment
*const then_assign
=
1340 new(ctx
) ir_assignment(then_deref
, new(ctx
) ir_constant(true));
1341 stmt
->then_instructions
.push_tail(then_assign
);
1343 stmt
->else_instructions
.append_list(&rhs_instructions
);
1344 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1345 ir_assignment
*const else_assign
=
1346 new(ctx
) ir_assignment(else_deref
, op
[1]);
1347 stmt
->else_instructions
.push_tail(else_assign
);
1349 result
= new(ctx
) ir_dereference_variable(tmp
);
1356 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1358 * "The logical binary operators and (&&), or ( | | ), and
1359 * exclusive or (^^). They operate only on two Boolean
1360 * expressions and result in a Boolean expression."
1362 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0, "LHS",
1364 op
[1] = get_scalar_boolean_operand(instructions
, state
, this, 1, "RHS",
1367 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1372 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1373 "operand", &error_emitted
);
1375 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1379 case ast_mul_assign
:
1380 case ast_div_assign
:
1381 case ast_add_assign
:
1382 case ast_sub_assign
: {
1383 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1384 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1386 type
= arithmetic_result_type(op
[0], op
[1],
1387 (this->oper
== ast_mul_assign
),
1390 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1393 result
= do_assignment(instructions
, state
,
1394 this->subexpressions
[0]->non_lvalue_description
,
1395 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1396 this->subexpressions
[0]->get_location());
1397 error_emitted
= (op
[0]->type
->is_error());
1399 /* GLSL 1.10 does not allow array assignment. However, we don't have to
1400 * explicitly test for this because none of the binary expression
1401 * operators allow array operands either.
1407 case ast_mod_assign
: {
1408 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1409 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1411 type
= modulus_result_type(op
[0]->type
, op
[1]->type
, state
, & loc
);
1413 assert(operations
[this->oper
] == ir_binop_mod
);
1415 ir_rvalue
*temp_rhs
;
1416 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1419 result
= do_assignment(instructions
, state
,
1420 this->subexpressions
[0]->non_lvalue_description
,
1421 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1422 this->subexpressions
[0]->get_location());
1423 error_emitted
= type
->is_error();
1428 case ast_rs_assign
: {
1429 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1430 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1431 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1433 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1434 type
, op
[0], op
[1]);
1435 result
= do_assignment(instructions
, state
,
1436 this->subexpressions
[0]->non_lvalue_description
,
1437 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1438 this->subexpressions
[0]->get_location());
1439 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1443 case ast_and_assign
:
1444 case ast_xor_assign
:
1445 case ast_or_assign
: {
1446 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1447 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1448 type
= bit_logic_result_type(op
[0]->type
, op
[1]->type
, this->oper
,
1450 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1451 type
, op
[0], op
[1]);
1452 result
= do_assignment(instructions
, state
,
1453 this->subexpressions
[0]->non_lvalue_description
,
1454 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1455 this->subexpressions
[0]->get_location());
1456 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1460 case ast_conditional
: {
1461 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1463 * "The ternary selection operator (?:). It operates on three
1464 * expressions (exp1 ? exp2 : exp3). This operator evaluates the
1465 * first expression, which must result in a scalar Boolean."
1467 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1468 "condition", &error_emitted
);
1470 /* The :? operator is implemented by generating an anonymous temporary
1471 * followed by an if-statement. The last instruction in each branch of
1472 * the if-statement assigns a value to the anonymous temporary. This
1473 * temporary is the r-value of the expression.
1475 exec_list then_instructions
;
1476 exec_list else_instructions
;
1478 op
[1] = this->subexpressions
[1]->hir(&then_instructions
, state
);
1479 op
[2] = this->subexpressions
[2]->hir(&else_instructions
, state
);
1481 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1483 * "The second and third expressions can be any type, as
1484 * long their types match, or there is a conversion in
1485 * Section 4.1.10 "Implicit Conversions" that can be applied
1486 * to one of the expressions to make their types match. This
1487 * resulting matching type is the type of the entire
1490 if ((!apply_implicit_conversion(op
[1]->type
, op
[2], state
)
1491 && !apply_implicit_conversion(op
[2]->type
, op
[1], state
))
1492 || (op
[1]->type
!= op
[2]->type
)) {
1493 YYLTYPE loc
= this->subexpressions
[1]->get_location();
1495 _mesa_glsl_error(& loc
, state
, "second and third operands of ?: "
1496 "operator must have matching types");
1497 error_emitted
= true;
1498 type
= glsl_type::error_type
;
1503 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1505 * "The second and third expressions must be the same type, but can
1506 * be of any type other than an array."
1508 if (type
->is_array() &&
1509 !state
->check_version(120, 300, &loc
,
1510 "second and third operands of ?: operator "
1511 "cannot be arrays")) {
1512 error_emitted
= true;
1515 ir_constant
*cond_val
= op
[0]->constant_expression_value();
1516 ir_constant
*then_val
= op
[1]->constant_expression_value();
1517 ir_constant
*else_val
= op
[2]->constant_expression_value();
1519 if (then_instructions
.is_empty()
1520 && else_instructions
.is_empty()
1521 && (cond_val
!= NULL
) && (then_val
!= NULL
) && (else_val
!= NULL
)) {
1522 result
= (cond_val
->value
.b
[0]) ? then_val
: else_val
;
1524 ir_variable
*const tmp
=
1525 new(ctx
) ir_variable(type
, "conditional_tmp", ir_var_temporary
);
1526 instructions
->push_tail(tmp
);
1528 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1529 instructions
->push_tail(stmt
);
1531 then_instructions
.move_nodes_to(& stmt
->then_instructions
);
1532 ir_dereference
*const then_deref
=
1533 new(ctx
) ir_dereference_variable(tmp
);
1534 ir_assignment
*const then_assign
=
1535 new(ctx
) ir_assignment(then_deref
, op
[1]);
1536 stmt
->then_instructions
.push_tail(then_assign
);
1538 else_instructions
.move_nodes_to(& stmt
->else_instructions
);
1539 ir_dereference
*const else_deref
=
1540 new(ctx
) ir_dereference_variable(tmp
);
1541 ir_assignment
*const else_assign
=
1542 new(ctx
) ir_assignment(else_deref
, op
[2]);
1543 stmt
->else_instructions
.push_tail(else_assign
);
1545 result
= new(ctx
) ir_dereference_variable(tmp
);
1552 this->non_lvalue_description
= (this->oper
== ast_pre_inc
)
1553 ? "pre-increment operation" : "pre-decrement operation";
1555 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1556 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1558 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1560 ir_rvalue
*temp_rhs
;
1561 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1564 result
= do_assignment(instructions
, state
,
1565 this->subexpressions
[0]->non_lvalue_description
,
1566 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1567 this->subexpressions
[0]->get_location());
1568 error_emitted
= op
[0]->type
->is_error();
1573 case ast_post_dec
: {
1574 this->non_lvalue_description
= (this->oper
== ast_post_inc
)
1575 ? "post-increment operation" : "post-decrement operation";
1576 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1577 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1579 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1581 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1583 ir_rvalue
*temp_rhs
;
1584 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1587 /* Get a temporary of a copy of the lvalue before it's modified.
1588 * This may get thrown away later.
1590 result
= get_lvalue_copy(instructions
, op
[0]->clone(ctx
, NULL
));
1592 (void)do_assignment(instructions
, state
,
1593 this->subexpressions
[0]->non_lvalue_description
,
1594 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1595 this->subexpressions
[0]->get_location());
1597 error_emitted
= op
[0]->type
->is_error();
1601 case ast_field_selection
:
1602 result
= _mesa_ast_field_selection_to_hir(this, instructions
, state
);
1605 case ast_array_index
: {
1606 YYLTYPE index_loc
= subexpressions
[1]->get_location();
1608 op
[0] = subexpressions
[0]->hir(instructions
, state
);
1609 op
[1] = subexpressions
[1]->hir(instructions
, state
);
1611 result
= _mesa_ast_array_index_to_hir(ctx
, state
, op
[0], op
[1],
1614 if (result
->type
->is_error())
1615 error_emitted
= true;
1620 case ast_function_call
:
1621 /* Should *NEVER* get here. ast_function_call should always be handled
1622 * by ast_function_expression::hir.
1627 case ast_identifier
: {
1628 /* ast_identifier can appear several places in a full abstract syntax
1629 * tree. This particular use must be at location specified in the grammar
1630 * as 'variable_identifier'.
1633 state
->symbols
->get_variable(this->primary_expression
.identifier
);
1637 result
= new(ctx
) ir_dereference_variable(var
);
1639 _mesa_glsl_error(& loc
, state
, "`%s' undeclared",
1640 this->primary_expression
.identifier
);
1642 result
= ir_rvalue::error_value(ctx
);
1643 error_emitted
= true;
1648 case ast_int_constant
:
1649 result
= new(ctx
) ir_constant(this->primary_expression
.int_constant
);
1652 case ast_uint_constant
:
1653 result
= new(ctx
) ir_constant(this->primary_expression
.uint_constant
);
1656 case ast_float_constant
:
1657 result
= new(ctx
) ir_constant(this->primary_expression
.float_constant
);
1660 case ast_bool_constant
:
1661 result
= new(ctx
) ir_constant(bool(this->primary_expression
.bool_constant
));
1664 case ast_sequence
: {
1665 /* It should not be possible to generate a sequence in the AST without
1666 * any expressions in it.
1668 assert(!this->expressions
.is_empty());
1670 /* The r-value of a sequence is the last expression in the sequence. If
1671 * the other expressions in the sequence do not have side-effects (and
1672 * therefore add instructions to the instruction list), they get dropped
1675 exec_node
*previous_tail_pred
= NULL
;
1676 YYLTYPE previous_operand_loc
= loc
;
1678 foreach_list_typed (ast_node
, ast
, link
, &this->expressions
) {
1679 /* If one of the operands of comma operator does not generate any
1680 * code, we want to emit a warning. At each pass through the loop
1681 * previous_tail_pred will point to the last instruction in the
1682 * stream *before* processing the previous operand. Naturally,
1683 * instructions->tail_pred will point to the last instruction in the
1684 * stream *after* processing the previous operand. If the two
1685 * pointers match, then the previous operand had no effect.
1687 * The warning behavior here differs slightly from GCC. GCC will
1688 * only emit a warning if none of the left-hand operands have an
1689 * effect. However, it will emit a warning for each. I believe that
1690 * there are some cases in C (especially with GCC extensions) where
1691 * it is useful to have an intermediate step in a sequence have no
1692 * effect, but I don't think these cases exist in GLSL. Either way,
1693 * it would be a giant hassle to replicate that behavior.
1695 if (previous_tail_pred
== instructions
->tail_pred
) {
1696 _mesa_glsl_warning(&previous_operand_loc
, state
,
1697 "left-hand operand of comma expression has "
1701 /* tail_pred is directly accessed instead of using the get_tail()
1702 * method for performance reasons. get_tail() has extra code to
1703 * return NULL when the list is empty. We don't care about that
1704 * here, so using tail_pred directly is fine.
1706 previous_tail_pred
= instructions
->tail_pred
;
1707 previous_operand_loc
= ast
->get_location();
1709 result
= ast
->hir(instructions
, state
);
1712 /* Any errors should have already been emitted in the loop above.
1714 error_emitted
= true;
1718 type
= NULL
; /* use result->type, not type. */
1719 assert(result
!= NULL
);
1721 if (result
->type
->is_error() && !error_emitted
)
1722 _mesa_glsl_error(& loc
, state
, "type mismatch");
1729 ast_expression_statement::hir(exec_list
*instructions
,
1730 struct _mesa_glsl_parse_state
*state
)
1732 /* It is possible to have expression statements that don't have an
1733 * expression. This is the solitary semicolon:
1735 * for (i = 0; i < 5; i++)
1738 * In this case the expression will be NULL. Test for NULL and don't do
1739 * anything in that case.
1741 if (expression
!= NULL
)
1742 expression
->hir(instructions
, state
);
1744 /* Statements do not have r-values.
1751 ast_compound_statement::hir(exec_list
*instructions
,
1752 struct _mesa_glsl_parse_state
*state
)
1755 state
->symbols
->push_scope();
1757 foreach_list_typed (ast_node
, ast
, link
, &this->statements
)
1758 ast
->hir(instructions
, state
);
1761 state
->symbols
->pop_scope();
1763 /* Compound statements do not have r-values.
1769 static const glsl_type
*
1770 process_array_type(YYLTYPE
*loc
, const glsl_type
*base
, ast_node
*array_size
,
1771 struct _mesa_glsl_parse_state
*state
)
1773 unsigned length
= 0;
1776 return glsl_type::error_type
;
1778 /* From page 19 (page 25) of the GLSL 1.20 spec:
1780 * "Only one-dimensional arrays may be declared."
1782 if (base
->is_array()) {
1783 _mesa_glsl_error(loc
, state
,
1784 "invalid array of `%s' (only one-dimensional arrays "
1787 return glsl_type::error_type
;
1790 if (array_size
!= NULL
) {
1791 exec_list dummy_instructions
;
1792 ir_rvalue
*const ir
= array_size
->hir(& dummy_instructions
, state
);
1793 YYLTYPE loc
= array_size
->get_location();
1796 if (!ir
->type
->is_integer()) {
1797 _mesa_glsl_error(& loc
, state
, "array size must be integer type");
1798 } else if (!ir
->type
->is_scalar()) {
1799 _mesa_glsl_error(& loc
, state
, "array size must be scalar type");
1801 ir_constant
*const size
= ir
->constant_expression_value();
1804 _mesa_glsl_error(& loc
, state
, "array size must be a "
1805 "constant valued expression");
1806 } else if (size
->value
.i
[0] <= 0) {
1807 _mesa_glsl_error(& loc
, state
, "array size must be > 0");
1809 assert(size
->type
== ir
->type
);
1810 length
= size
->value
.u
[0];
1812 /* If the array size is const (and we've verified that
1813 * it is) then no instructions should have been emitted
1814 * when we converted it to HIR. If they were emitted,
1815 * then either the array size isn't const after all, or
1816 * we are emitting unnecessary instructions.
1818 assert(dummy_instructions
.is_empty());
1824 const glsl_type
*array_type
= glsl_type::get_array_instance(base
, length
);
1825 return array_type
!= NULL
? array_type
: glsl_type::error_type
;
1830 ast_type_specifier::glsl_type(const char **name
,
1831 struct _mesa_glsl_parse_state
*state
) const
1833 const struct glsl_type
*type
;
1835 type
= state
->symbols
->get_type(this->type_name
);
1836 *name
= this->type_name
;
1838 if (this->is_array
) {
1839 YYLTYPE loc
= this->get_location();
1840 type
= process_array_type(&loc
, type
, this->array_size
, state
);
1847 ast_fully_specified_type::glsl_type(const char **name
,
1848 struct _mesa_glsl_parse_state
*state
) const
1850 const struct glsl_type
*type
= this->specifier
->glsl_type(name
, state
);
1855 if (type
->base_type
== GLSL_TYPE_FLOAT
1857 && state
->target
== fragment_shader
1858 && this->qualifier
.precision
== ast_precision_none
1859 && state
->symbols
->get_variable("#default precision") == NULL
) {
1860 YYLTYPE loc
= this->get_location();
1861 _mesa_glsl_error(&loc
, state
,
1862 "no precision specified this scope for type `%s'",
1870 * Determine whether a toplevel variable declaration declares a varying. This
1871 * function operates by examining the variable's mode and the shader target,
1872 * so it correctly identifies linkage variables regardless of whether they are
1873 * declared using the deprecated "varying" syntax or the new "in/out" syntax.
1875 * Passing a non-toplevel variable declaration (e.g. a function parameter) to
1876 * this function will produce undefined results.
1879 is_varying_var(ir_variable
*var
, _mesa_glsl_parser_targets target
)
1883 return var
->mode
== ir_var_shader_out
;
1884 case fragment_shader
:
1885 return var
->mode
== ir_var_shader_in
;
1887 return var
->mode
== ir_var_shader_out
|| var
->mode
== ir_var_shader_in
;
1893 * Matrix layout qualifiers are only allowed on certain types
1896 validate_matrix_layout_for_type(struct _mesa_glsl_parse_state
*state
,
1898 const glsl_type
*type
,
1901 if (var
&& !var
->is_in_uniform_block()) {
1902 /* Layout qualifiers may only apply to interface blocks and fields in
1905 _mesa_glsl_error(loc
, state
,
1906 "uniform block layout qualifiers row_major and "
1907 "column_major may not be applied to variables "
1908 "outside of uniform blocks");
1909 } else if (!type
->is_matrix()) {
1910 /* The OpenGL ES 3.0 conformance tests did not originally allow
1911 * matrix layout qualifiers on non-matrices. However, the OpenGL
1912 * 4.4 and OpenGL ES 3.0 (revision TBD) specifications were
1913 * amended to specifically allow these layouts on all types. Emit
1914 * a warning so that people know their code may not be portable.
1916 _mesa_glsl_warning(loc
, state
,
1917 "uniform block layout qualifiers row_major and "
1918 "column_major applied to non-matrix types may "
1919 "be rejected by older compilers");
1920 } else if (type
->is_record()) {
1921 /* We allow 'layout(row_major)' on structure types because it's the only
1922 * way to get row-major layouts on matrices contained in structures.
1924 _mesa_glsl_warning(loc
, state
,
1925 "uniform block layout qualifiers row_major and "
1926 "column_major applied to structure types is not "
1927 "strictly conformant and may be rejected by other "
1933 validate_binding_qualifier(struct _mesa_glsl_parse_state
*state
,
1936 const ast_type_qualifier
*qual
)
1938 if (var
->mode
!= ir_var_uniform
) {
1939 _mesa_glsl_error(loc
, state
,
1940 "the \"binding\" qualifier only applies to uniforms");
1944 if (qual
->binding
< 0) {
1945 _mesa_glsl_error(loc
, state
, "binding values must be >= 0");
1949 const struct gl_context
*const ctx
= state
->ctx
;
1950 unsigned elements
= var
->type
->is_array() ? var
->type
->length
: 1;
1951 unsigned max_index
= qual
->binding
+ elements
- 1;
1953 if (var
->type
->is_interface()) {
1954 /* UBOs. From page 60 of the GLSL 4.20 specification:
1955 * "If the binding point for any uniform block instance is less than zero,
1956 * or greater than or equal to the implementation-dependent maximum
1957 * number of uniform buffer bindings, a compilation error will occur.
1958 * When the binding identifier is used with a uniform block instanced as
1959 * an array of size N, all elements of the array from binding through
1960 * binding + N – 1 must be within this range."
1962 * The implementation-dependent maximum is GL_MAX_UNIFORM_BUFFER_BINDINGS.
1964 if (max_index
>= ctx
->Const
.MaxUniformBufferBindings
) {
1965 _mesa_glsl_error(loc
, state
, "layout(binding = %d) for %d UBOs exceeds "
1966 "the maximum number of UBO binding points (%d)",
1967 qual
->binding
, elements
,
1968 ctx
->Const
.MaxUniformBufferBindings
);
1971 } else if (var
->type
->is_sampler() ||
1972 (var
->type
->is_array() && var
->type
->fields
.array
->is_sampler())) {
1973 /* Samplers. From page 63 of the GLSL 4.20 specification:
1974 * "If the binding is less than zero, or greater than or equal to the
1975 * implementation-dependent maximum supported number of units, a
1976 * compilation error will occur. When the binding identifier is used
1977 * with an array of size N, all elements of the array from binding
1978 * through binding + N - 1 must be within this range."
1981 switch (state
->target
) {
1983 limit
= ctx
->Const
.VertexProgram
.MaxTextureImageUnits
;
1985 case geometry_shader
:
1986 limit
= ctx
->Const
.GeometryProgram
.MaxTextureImageUnits
;
1988 case fragment_shader
:
1989 limit
= ctx
->Const
.FragmentProgram
.MaxTextureImageUnits
;
1993 if (max_index
>= limit
) {
1994 _mesa_glsl_error(loc
, state
, "layout(binding = %d) for %d samplers "
1995 "exceeds the maximum number of texture image units "
1996 "(%d)", qual
->binding
, elements
, limit
);
2000 } else if (var
->type
->contains_atomic()) {
2001 assert(ctx
->Const
.MaxAtomicBufferBindings
<= MAX_COMBINED_ATOMIC_BUFFERS
);
2002 if (unsigned(qual
->binding
) >= ctx
->Const
.MaxAtomicBufferBindings
) {
2003 _mesa_glsl_error(loc
, state
, "layout(binding = %d) exceeds the "
2004 " maximum number of atomic counter buffer bindings"
2005 "(%d)", qual
->binding
,
2006 ctx
->Const
.MaxAtomicBufferBindings
);
2011 _mesa_glsl_error(loc
, state
,
2012 "the \"binding\" qualifier only applies to uniform "
2013 "blocks, samplers, atomic counters, or arrays thereof");
2021 static glsl_interp_qualifier
2022 interpret_interpolation_qualifier(const struct ast_type_qualifier
*qual
,
2023 ir_variable_mode mode
,
2024 struct _mesa_glsl_parse_state
*state
,
2027 glsl_interp_qualifier interpolation
;
2028 if (qual
->flags
.q
.flat
)
2029 interpolation
= INTERP_QUALIFIER_FLAT
;
2030 else if (qual
->flags
.q
.noperspective
)
2031 interpolation
= INTERP_QUALIFIER_NOPERSPECTIVE
;
2032 else if (qual
->flags
.q
.smooth
)
2033 interpolation
= INTERP_QUALIFIER_SMOOTH
;
2035 interpolation
= INTERP_QUALIFIER_NONE
;
2037 if (interpolation
!= INTERP_QUALIFIER_NONE
) {
2038 if (mode
!= ir_var_shader_in
&& mode
!= ir_var_shader_out
) {
2039 _mesa_glsl_error(loc
, state
,
2040 "interpolation qualifier `%s' can only be applied to "
2041 "shader inputs or outputs.",
2042 interpolation_string(interpolation
));
2046 if ((state
->target
== vertex_shader
&& mode
== ir_var_shader_in
) ||
2047 (state
->target
== fragment_shader
&& mode
== ir_var_shader_out
)) {
2048 _mesa_glsl_error(loc
, state
,
2049 "interpolation qualifier `%s' cannot be applied to "
2050 "vertex shader inputs or fragment shader outputs",
2051 interpolation_string(interpolation
));
2055 return interpolation
;
2060 validate_explicit_location(const struct ast_type_qualifier
*qual
,
2062 struct _mesa_glsl_parse_state
*state
,
2067 /* In the vertex shader only shader inputs can be given explicit
2070 * In the fragment shader only shader outputs can be given explicit
2073 switch (state
->target
) {
2075 if (var
->mode
== ir_var_shader_in
) {
2076 if (!state
->check_explicit_attrib_location_allowed(loc
, var
))
2085 case geometry_shader
:
2086 _mesa_glsl_error(loc
, state
,
2087 "geometry shader variables cannot be given "
2088 "explicit locations");
2091 case fragment_shader
:
2092 if (var
->mode
== ir_var_shader_out
) {
2093 if (!state
->check_explicit_attrib_location_allowed(loc
, var
))
2104 _mesa_glsl_error(loc
, state
,
2105 "%s cannot be given an explicit location in %s shader",
2107 _mesa_glsl_shader_target_name(state
->target
));
2109 var
->explicit_location
= true;
2111 /* This bit of silliness is needed because invalid explicit locations
2112 * are supposed to be flagged during linking. Small negative values
2113 * biased by VERT_ATTRIB_GENERIC0 or FRAG_RESULT_DATA0 could alias
2114 * built-in values (e.g., -16+VERT_ATTRIB_GENERIC0 = VERT_ATTRIB_POS).
2115 * The linker needs to be able to differentiate these cases. This
2116 * ensures that negative values stay negative.
2118 if (qual
->location
>= 0) {
2119 var
->location
= (state
->target
== vertex_shader
)
2120 ? (qual
->location
+ VERT_ATTRIB_GENERIC0
)
2121 : (qual
->location
+ FRAG_RESULT_DATA0
);
2123 var
->location
= qual
->location
;
2126 if (qual
->flags
.q
.explicit_index
) {
2127 /* From the GLSL 4.30 specification, section 4.4.2 (Output
2128 * Layout Qualifiers):
2130 * "It is also a compile-time error if a fragment shader
2131 * sets a layout index to less than 0 or greater than 1."
2133 * Older specifications don't mandate a behavior; we take
2134 * this as a clarification and always generate the error.
2136 if (qual
->index
< 0 || qual
->index
> 1) {
2137 _mesa_glsl_error(loc
, state
,
2138 "explicit index may only be 0 or 1");
2140 var
->explicit_index
= true;
2141 var
->index
= qual
->index
;
2150 apply_type_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
2152 struct _mesa_glsl_parse_state
*state
,
2156 STATIC_ASSERT(sizeof(qual
->flags
.q
) <= sizeof(qual
->flags
.i
));
2158 if (qual
->flags
.q
.invariant
) {
2160 _mesa_glsl_error(loc
, state
,
2161 "variable `%s' may not be redeclared "
2162 "`invariant' after being used",
2169 if (qual
->flags
.q
.constant
|| qual
->flags
.q
.attribute
2170 || qual
->flags
.q
.uniform
2171 || (qual
->flags
.q
.varying
&& (state
->target
== fragment_shader
)))
2174 if (qual
->flags
.q
.centroid
)
2177 if (qual
->flags
.q
.attribute
&& state
->target
!= vertex_shader
) {
2178 var
->type
= glsl_type::error_type
;
2179 _mesa_glsl_error(loc
, state
,
2180 "`attribute' variables may not be declared in the "
2182 _mesa_glsl_shader_target_name(state
->target
));
2185 /* Section 6.1.1 (Function Calling Conventions) of the GLSL 1.10 spec says:
2187 * "However, the const qualifier cannot be used with out or inout."
2189 * The same section of the GLSL 4.40 spec further clarifies this saying:
2191 * "The const qualifier cannot be used with out or inout, or a
2192 * compile-time error results."
2194 if (is_parameter
&& qual
->flags
.q
.constant
&& qual
->flags
.q
.out
) {
2195 _mesa_glsl_error(loc
, state
,
2196 "`const' may not be applied to `out' or `inout' "
2197 "function parameters");
2200 /* If there is no qualifier that changes the mode of the variable, leave
2201 * the setting alone.
2203 if (qual
->flags
.q
.in
&& qual
->flags
.q
.out
)
2204 var
->mode
= ir_var_function_inout
;
2205 else if (qual
->flags
.q
.in
)
2206 var
->mode
= is_parameter
? ir_var_function_in
: ir_var_shader_in
;
2207 else if (qual
->flags
.q
.attribute
2208 || (qual
->flags
.q
.varying
&& (state
->target
== fragment_shader
)))
2209 var
->mode
= ir_var_shader_in
;
2210 else if (qual
->flags
.q
.out
)
2211 var
->mode
= is_parameter
? ir_var_function_out
: ir_var_shader_out
;
2212 else if (qual
->flags
.q
.varying
&& (state
->target
== vertex_shader
))
2213 var
->mode
= ir_var_shader_out
;
2214 else if (qual
->flags
.q
.uniform
)
2215 var
->mode
= ir_var_uniform
;
2217 if (!is_parameter
&& is_varying_var(var
, state
->target
)) {
2218 /* This variable is being used to link data between shader stages (in
2219 * pre-glsl-1.30 parlance, it's a "varying"). Check that it has a type
2220 * that is allowed for such purposes.
2222 * From page 25 (page 31 of the PDF) of the GLSL 1.10 spec:
2224 * "The varying qualifier can be used only with the data types
2225 * float, vec2, vec3, vec4, mat2, mat3, and mat4, or arrays of
2228 * This was relaxed in GLSL version 1.30 and GLSL ES version 3.00. From
2229 * page 31 (page 37 of the PDF) of the GLSL 1.30 spec:
2231 * "Fragment inputs can only be signed and unsigned integers and
2232 * integer vectors, float, floating-point vectors, matrices, or
2233 * arrays of these. Structures cannot be input.
2235 * Similar text exists in the section on vertex shader outputs.
2237 * Similar text exists in the GLSL ES 3.00 spec, except that the GLSL ES
2238 * 3.00 spec allows structs as well. Varying structs are also allowed
2241 switch (var
->type
->get_scalar_type()->base_type
) {
2242 case GLSL_TYPE_FLOAT
:
2243 /* Ok in all GLSL versions */
2245 case GLSL_TYPE_UINT
:
2247 if (state
->is_version(130, 300))
2249 _mesa_glsl_error(loc
, state
,
2250 "varying variables must be of base type float in %s",
2251 state
->get_version_string());
2253 case GLSL_TYPE_STRUCT
:
2254 if (state
->is_version(150, 300))
2256 _mesa_glsl_error(loc
, state
,
2257 "varying variables may not be of type struct");
2260 _mesa_glsl_error(loc
, state
, "illegal type for a varying variable");
2265 if (state
->all_invariant
&& (state
->current_function
== NULL
)) {
2266 switch (state
->target
) {
2268 if (var
->mode
== ir_var_shader_out
)
2269 var
->invariant
= true;
2271 case geometry_shader
:
2272 if ((var
->mode
== ir_var_shader_in
)
2273 || (var
->mode
== ir_var_shader_out
))
2274 var
->invariant
= true;
2276 case fragment_shader
:
2277 if (var
->mode
== ir_var_shader_in
)
2278 var
->invariant
= true;
2283 var
->interpolation
=
2284 interpret_interpolation_qualifier(qual
, (ir_variable_mode
) var
->mode
,
2287 var
->pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
2288 var
->origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
2289 if ((qual
->flags
.q
.origin_upper_left
|| qual
->flags
.q
.pixel_center_integer
)
2290 && (strcmp(var
->name
, "gl_FragCoord") != 0)) {
2291 const char *const qual_string
= (qual
->flags
.q
.origin_upper_left
)
2292 ? "origin_upper_left" : "pixel_center_integer";
2294 _mesa_glsl_error(loc
, state
,
2295 "layout qualifier `%s' can only be applied to "
2296 "fragment shader input `gl_FragCoord'",
2300 if (qual
->flags
.q
.explicit_location
) {
2301 validate_explicit_location(qual
, var
, state
, loc
);
2302 } else if (qual
->flags
.q
.explicit_index
) {
2303 _mesa_glsl_error(loc
, state
,
2304 "explicit index requires explicit location");
2307 if (qual
->flags
.q
.explicit_binding
&&
2308 validate_binding_qualifier(state
, loc
, var
, qual
)) {
2309 var
->explicit_binding
= true;
2310 var
->binding
= qual
->binding
;
2313 if (var
->type
->contains_atomic()) {
2314 if (var
->mode
== ir_var_uniform
) {
2315 if (var
->explicit_binding
) {
2316 unsigned *offset
= &state
->atomic_counter_offsets
[var
->binding
];
2318 if (*offset
% ATOMIC_COUNTER_SIZE
)
2319 _mesa_glsl_error(loc
, state
,
2320 "misaligned atomic counter offset");
2322 var
->atomic
.offset
= *offset
;
2323 *offset
+= var
->type
->atomic_size();
2326 _mesa_glsl_error(loc
, state
,
2327 "atomic counters require explicit binding point");
2329 } else if (var
->mode
!= ir_var_function_in
) {
2330 _mesa_glsl_error(loc
, state
, "atomic counters may only be declared as "
2331 "function parameters or uniform-qualified "
2332 "global variables");
2336 /* Does the declaration use the deprecated 'attribute' or 'varying'
2339 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
2340 || qual
->flags
.q
.varying
;
2342 /* Is the 'layout' keyword used with parameters that allow relaxed checking.
2343 * Many implementations of GL_ARB_fragment_coord_conventions_enable and some
2344 * implementations (only Mesa?) GL_ARB_explicit_attrib_location_enable
2345 * allowed the layout qualifier to be used with 'varying' and 'attribute'.
2346 * These extensions and all following extensions that add the 'layout'
2347 * keyword have been modified to require the use of 'in' or 'out'.
2349 * The following extension do not allow the deprecated keywords:
2351 * GL_AMD_conservative_depth
2352 * GL_ARB_conservative_depth
2353 * GL_ARB_gpu_shader5
2354 * GL_ARB_separate_shader_objects
2355 * GL_ARB_tesselation_shader
2356 * GL_ARB_transform_feedback3
2357 * GL_ARB_uniform_buffer_object
2359 * It is unknown whether GL_EXT_shader_image_load_store or GL_NV_gpu_shader5
2360 * allow layout with the deprecated keywords.
2362 const bool relaxed_layout_qualifier_checking
=
2363 state
->ARB_fragment_coord_conventions_enable
;
2365 if (qual
->has_layout() && uses_deprecated_qualifier
) {
2366 if (relaxed_layout_qualifier_checking
) {
2367 _mesa_glsl_warning(loc
, state
,
2368 "`layout' qualifier may not be used with "
2369 "`attribute' or `varying'");
2371 _mesa_glsl_error(loc
, state
,
2372 "`layout' qualifier may not be used with "
2373 "`attribute' or `varying'");
2377 /* Layout qualifiers for gl_FragDepth, which are enabled by extension
2378 * AMD_conservative_depth.
2380 int depth_layout_count
= qual
->flags
.q
.depth_any
2381 + qual
->flags
.q
.depth_greater
2382 + qual
->flags
.q
.depth_less
2383 + qual
->flags
.q
.depth_unchanged
;
2384 if (depth_layout_count
> 0
2385 && !state
->AMD_conservative_depth_enable
2386 && !state
->ARB_conservative_depth_enable
) {
2387 _mesa_glsl_error(loc
, state
,
2388 "extension GL_AMD_conservative_depth or "
2389 "GL_ARB_conservative_depth must be enabled "
2390 "to use depth layout qualifiers");
2391 } else if (depth_layout_count
> 0
2392 && strcmp(var
->name
, "gl_FragDepth") != 0) {
2393 _mesa_glsl_error(loc
, state
,
2394 "depth layout qualifiers can be applied only to "
2396 } else if (depth_layout_count
> 1
2397 && strcmp(var
->name
, "gl_FragDepth") == 0) {
2398 _mesa_glsl_error(loc
, state
,
2399 "at most one depth layout qualifier can be applied to "
2402 if (qual
->flags
.q
.depth_any
)
2403 var
->depth_layout
= ir_depth_layout_any
;
2404 else if (qual
->flags
.q
.depth_greater
)
2405 var
->depth_layout
= ir_depth_layout_greater
;
2406 else if (qual
->flags
.q
.depth_less
)
2407 var
->depth_layout
= ir_depth_layout_less
;
2408 else if (qual
->flags
.q
.depth_unchanged
)
2409 var
->depth_layout
= ir_depth_layout_unchanged
;
2411 var
->depth_layout
= ir_depth_layout_none
;
2413 if (qual
->flags
.q
.std140
||
2414 qual
->flags
.q
.packed
||
2415 qual
->flags
.q
.shared
) {
2416 _mesa_glsl_error(loc
, state
,
2417 "uniform block layout qualifiers std140, packed, and "
2418 "shared can only be applied to uniform blocks, not "
2422 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
2423 validate_matrix_layout_for_type(state
, loc
, var
->type
, var
);
2428 * Get the variable that is being redeclared by this declaration
2430 * Semantic checks to verify the validity of the redeclaration are also
2431 * performed. If semantic checks fail, compilation error will be emitted via
2432 * \c _mesa_glsl_error, but a non-\c NULL pointer will still be returned.
2435 * A pointer to an existing variable in the current scope if the declaration
2436 * is a redeclaration, \c NULL otherwise.
2438 static ir_variable
*
2439 get_variable_being_redeclared(ir_variable
*var
, YYLTYPE loc
,
2440 struct _mesa_glsl_parse_state
*state
,
2441 bool allow_all_redeclarations
)
2443 /* Check if this declaration is actually a re-declaration, either to
2444 * resize an array or add qualifiers to an existing variable.
2446 * This is allowed for variables in the current scope, or when at
2447 * global scope (for built-ins in the implicit outer scope).
2449 ir_variable
*earlier
= state
->symbols
->get_variable(var
->name
);
2450 if (earlier
== NULL
||
2451 (state
->current_function
!= NULL
&&
2452 !state
->symbols
->name_declared_this_scope(var
->name
))) {
2457 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec,
2459 * "It is legal to declare an array without a size and then
2460 * later re-declare the same name as an array of the same
2461 * type and specify a size."
2463 if (earlier
->type
->is_unsized_array() && var
->type
->is_array()
2464 && (var
->type
->element_type() == earlier
->type
->element_type())) {
2465 /* FINISHME: This doesn't match the qualifiers on the two
2466 * FINISHME: declarations. It's not 100% clear whether this is
2467 * FINISHME: required or not.
2470 const unsigned size
= unsigned(var
->type
->array_size());
2471 check_builtin_array_max_size(var
->name
, size
, loc
, state
);
2472 if ((size
> 0) && (size
<= earlier
->max_array_access
)) {
2473 _mesa_glsl_error(& loc
, state
, "array size must be > %u due to "
2475 earlier
->max_array_access
);
2478 earlier
->type
= var
->type
;
2481 } else if ((state
->ARB_fragment_coord_conventions_enable
||
2482 state
->is_version(150, 0))
2483 && strcmp(var
->name
, "gl_FragCoord") == 0
2484 && earlier
->type
== var
->type
2485 && earlier
->mode
== var
->mode
) {
2486 /* Allow redeclaration of gl_FragCoord for ARB_fcc layout
2489 earlier
->origin_upper_left
= var
->origin_upper_left
;
2490 earlier
->pixel_center_integer
= var
->pixel_center_integer
;
2492 /* According to section 4.3.7 of the GLSL 1.30 spec,
2493 * the following built-in varaibles can be redeclared with an
2494 * interpolation qualifier:
2497 * * gl_FrontSecondaryColor
2498 * * gl_BackSecondaryColor
2500 * * gl_SecondaryColor
2502 } else if (state
->is_version(130, 0)
2503 && (strcmp(var
->name
, "gl_FrontColor") == 0
2504 || strcmp(var
->name
, "gl_BackColor") == 0
2505 || strcmp(var
->name
, "gl_FrontSecondaryColor") == 0
2506 || strcmp(var
->name
, "gl_BackSecondaryColor") == 0
2507 || strcmp(var
->name
, "gl_Color") == 0
2508 || strcmp(var
->name
, "gl_SecondaryColor") == 0)
2509 && earlier
->type
== var
->type
2510 && earlier
->mode
== var
->mode
) {
2511 earlier
->interpolation
= var
->interpolation
;
2513 /* Layout qualifiers for gl_FragDepth. */
2514 } else if ((state
->AMD_conservative_depth_enable
||
2515 state
->ARB_conservative_depth_enable
)
2516 && strcmp(var
->name
, "gl_FragDepth") == 0
2517 && earlier
->type
== var
->type
2518 && earlier
->mode
== var
->mode
) {
2520 /** From the AMD_conservative_depth spec:
2521 * Within any shader, the first redeclarations of gl_FragDepth
2522 * must appear before any use of gl_FragDepth.
2524 if (earlier
->used
) {
2525 _mesa_glsl_error(&loc
, state
,
2526 "the first redeclaration of gl_FragDepth "
2527 "must appear before any use of gl_FragDepth");
2530 /* Prevent inconsistent redeclaration of depth layout qualifier. */
2531 if (earlier
->depth_layout
!= ir_depth_layout_none
2532 && earlier
->depth_layout
!= var
->depth_layout
) {
2533 _mesa_glsl_error(&loc
, state
,
2534 "gl_FragDepth: depth layout is declared here "
2535 "as '%s, but it was previously declared as "
2537 depth_layout_string(var
->depth_layout
),
2538 depth_layout_string(earlier
->depth_layout
));
2541 earlier
->depth_layout
= var
->depth_layout
;
2543 } else if (allow_all_redeclarations
) {
2544 if (earlier
->mode
!= var
->mode
) {
2545 _mesa_glsl_error(&loc
, state
,
2546 "redeclaration of `%s' with incorrect qualifiers",
2548 } else if (earlier
->type
!= var
->type
) {
2549 _mesa_glsl_error(&loc
, state
,
2550 "redeclaration of `%s' has incorrect type",
2554 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", var
->name
);
2561 * Generate the IR for an initializer in a variable declaration
2564 process_initializer(ir_variable
*var
, ast_declaration
*decl
,
2565 ast_fully_specified_type
*type
,
2566 exec_list
*initializer_instructions
,
2567 struct _mesa_glsl_parse_state
*state
)
2569 ir_rvalue
*result
= NULL
;
2571 YYLTYPE initializer_loc
= decl
->initializer
->get_location();
2573 /* From page 24 (page 30 of the PDF) of the GLSL 1.10 spec:
2575 * "All uniform variables are read-only and are initialized either
2576 * directly by an application via API commands, or indirectly by
2579 if (var
->mode
== ir_var_uniform
) {
2580 state
->check_version(120, 0, &initializer_loc
,
2581 "cannot initialize uniforms");
2584 if (var
->type
->is_sampler()) {
2585 _mesa_glsl_error(& initializer_loc
, state
,
2586 "cannot initialize samplers");
2589 if ((var
->mode
== ir_var_shader_in
) && (state
->current_function
== NULL
)) {
2590 _mesa_glsl_error(& initializer_loc
, state
,
2591 "cannot initialize %s shader input / %s",
2592 _mesa_glsl_shader_target_name(state
->target
),
2593 (state
->target
== vertex_shader
)
2594 ? "attribute" : "varying");
2597 ir_dereference
*const lhs
= new(state
) ir_dereference_variable(var
);
2598 ir_rvalue
*rhs
= decl
->initializer
->hir(initializer_instructions
,
2601 /* Calculate the constant value if this is a const or uniform
2604 if (type
->qualifier
.flags
.q
.constant
2605 || type
->qualifier
.flags
.q
.uniform
) {
2606 ir_rvalue
*new_rhs
= validate_assignment(state
, initializer_loc
,
2607 var
->type
, rhs
, true);
2608 if (new_rhs
!= NULL
) {
2611 ir_constant
*constant_value
= rhs
->constant_expression_value();
2612 if (!constant_value
) {
2613 /* If ARB_shading_language_420pack is enabled, initializers of
2614 * const-qualified local variables do not have to be constant
2615 * expressions. Const-qualified global variables must still be
2616 * initialized with constant expressions.
2618 if (!state
->ARB_shading_language_420pack_enable
2619 || state
->current_function
== NULL
) {
2620 _mesa_glsl_error(& initializer_loc
, state
,
2621 "initializer of %s variable `%s' must be a "
2622 "constant expression",
2623 (type
->qualifier
.flags
.q
.constant
)
2624 ? "const" : "uniform",
2626 if (var
->type
->is_numeric()) {
2627 /* Reduce cascading errors. */
2628 var
->constant_value
= ir_constant::zero(state
, var
->type
);
2632 rhs
= constant_value
;
2633 var
->constant_value
= constant_value
;
2636 if (var
->type
->is_numeric()) {
2637 /* Reduce cascading errors. */
2638 var
->constant_value
= ir_constant::zero(state
, var
->type
);
2643 if (rhs
&& !rhs
->type
->is_error()) {
2644 bool temp
= var
->read_only
;
2645 if (type
->qualifier
.flags
.q
.constant
)
2646 var
->read_only
= false;
2648 /* Never emit code to initialize a uniform.
2650 const glsl_type
*initializer_type
;
2651 if (!type
->qualifier
.flags
.q
.uniform
) {
2652 result
= do_assignment(initializer_instructions
, state
,
2655 type
->get_location());
2656 initializer_type
= result
->type
;
2658 initializer_type
= rhs
->type
;
2660 var
->constant_initializer
= rhs
->constant_expression_value();
2661 var
->has_initializer
= true;
2663 /* If the declared variable is an unsized array, it must inherrit
2664 * its full type from the initializer. A declaration such as
2666 * uniform float a[] = float[](1.0, 2.0, 3.0, 3.0);
2670 * uniform float a[4] = float[](1.0, 2.0, 3.0, 3.0);
2672 * The assignment generated in the if-statement (below) will also
2673 * automatically handle this case for non-uniforms.
2675 * If the declared variable is not an array, the types must
2676 * already match exactly. As a result, the type assignment
2677 * here can be done unconditionally. For non-uniforms the call
2678 * to do_assignment can change the type of the initializer (via
2679 * the implicit conversion rules). For uniforms the initializer
2680 * must be a constant expression, and the type of that expression
2681 * was validated above.
2683 var
->type
= initializer_type
;
2685 var
->read_only
= temp
;
2693 * Do additional processing necessary for geometry shader input declarations
2694 * (this covers both interface blocks arrays and bare input variables).
2697 handle_geometry_shader_input_decl(struct _mesa_glsl_parse_state
*state
,
2698 YYLTYPE loc
, ir_variable
*var
)
2700 unsigned num_vertices
= 0;
2701 if (state
->gs_input_prim_type_specified
) {
2702 num_vertices
= vertices_per_prim(state
->gs_input_prim_type
);
2705 /* Geometry shader input variables must be arrays. Caller should have
2706 * reported an error for this.
2708 if (!var
->type
->is_array()) {
2709 assert(state
->error
);
2711 /* To avoid cascading failures, short circuit the checks below. */
2715 if (var
->type
->is_unsized_array()) {
2716 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec says:
2718 * All geometry shader input unsized array declarations will be
2719 * sized by an earlier input layout qualifier, when present, as per
2720 * the following table.
2722 * Followed by a table mapping each allowed input layout qualifier to
2723 * the corresponding input length.
2725 if (num_vertices
!= 0)
2726 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
2729 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec
2730 * includes the following examples of compile-time errors:
2732 * // code sequence within one shader...
2733 * in vec4 Color1[]; // size unknown
2734 * ...Color1.length()...// illegal, length() unknown
2735 * in vec4 Color2[2]; // size is 2
2736 * ...Color1.length()...// illegal, Color1 still has no size
2737 * in vec4 Color3[3]; // illegal, input sizes are inconsistent
2738 * layout(lines) in; // legal, input size is 2, matching
2739 * in vec4 Color4[3]; // illegal, contradicts layout
2742 * To detect the case illustrated by Color3, we verify that the size of
2743 * an explicitly-sized array matches the size of any previously declared
2744 * explicitly-sized array. To detect the case illustrated by Color4, we
2745 * verify that the size of an explicitly-sized array is consistent with
2746 * any previously declared input layout.
2748 if (num_vertices
!= 0 && var
->type
->length
!= num_vertices
) {
2749 _mesa_glsl_error(&loc
, state
,
2750 "geometry shader input size contradicts previously"
2751 " declared layout (size is %u, but layout requires a"
2752 " size of %u)", var
->type
->length
, num_vertices
);
2753 } else if (state
->gs_input_size
!= 0 &&
2754 var
->type
->length
!= state
->gs_input_size
) {
2755 _mesa_glsl_error(&loc
, state
,
2756 "geometry shader input sizes are "
2757 "inconsistent (size is %u, but a previous "
2758 "declaration has size %u)",
2759 var
->type
->length
, state
->gs_input_size
);
2761 state
->gs_input_size
= var
->type
->length
;
2768 validate_identifier(const char *identifier
, YYLTYPE loc
,
2769 struct _mesa_glsl_parse_state
*state
)
2771 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
2773 * "Identifiers starting with "gl_" are reserved for use by
2774 * OpenGL, and may not be declared in a shader as either a
2775 * variable or a function."
2777 if (strncmp(identifier
, "gl_", 3) == 0) {
2778 _mesa_glsl_error(&loc
, state
,
2779 "identifier `%s' uses reserved `gl_' prefix",
2781 } else if (strstr(identifier
, "__")) {
2782 /* From page 14 (page 20 of the PDF) of the GLSL 1.10
2785 * "In addition, all identifiers containing two
2786 * consecutive underscores (__) are reserved as
2787 * possible future keywords."
2789 _mesa_glsl_error(&loc
, state
,
2790 "identifier `%s' uses reserved `__' string",
2797 ast_declarator_list::hir(exec_list
*instructions
,
2798 struct _mesa_glsl_parse_state
*state
)
2801 const struct glsl_type
*decl_type
;
2802 const char *type_name
= NULL
;
2803 ir_rvalue
*result
= NULL
;
2804 YYLTYPE loc
= this->get_location();
2806 /* From page 46 (page 52 of the PDF) of the GLSL 1.50 spec:
2808 * "To ensure that a particular output variable is invariant, it is
2809 * necessary to use the invariant qualifier. It can either be used to
2810 * qualify a previously declared variable as being invariant
2812 * invariant gl_Position; // make existing gl_Position be invariant"
2814 * In these cases the parser will set the 'invariant' flag in the declarator
2815 * list, and the type will be NULL.
2817 if (this->invariant
) {
2818 assert(this->type
== NULL
);
2820 if (state
->current_function
!= NULL
) {
2821 _mesa_glsl_error(& loc
, state
,
2822 "all uses of `invariant' keyword must be at global "
2826 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
2827 assert(!decl
->is_array
);
2828 assert(decl
->array_size
== NULL
);
2829 assert(decl
->initializer
== NULL
);
2831 ir_variable
*const earlier
=
2832 state
->symbols
->get_variable(decl
->identifier
);
2833 if (earlier
== NULL
) {
2834 _mesa_glsl_error(& loc
, state
,
2835 "undeclared variable `%s' cannot be marked "
2836 "invariant", decl
->identifier
);
2837 } else if ((state
->target
== vertex_shader
)
2838 && (earlier
->mode
!= ir_var_shader_out
)) {
2839 _mesa_glsl_error(& loc
, state
,
2840 "`%s' cannot be marked invariant, vertex shader "
2841 "outputs only", decl
->identifier
);
2842 } else if ((state
->target
== fragment_shader
)
2843 && (earlier
->mode
!= ir_var_shader_in
)) {
2844 _mesa_glsl_error(& loc
, state
,
2845 "`%s' cannot be marked invariant, fragment shader "
2846 "inputs only", decl
->identifier
);
2847 } else if (earlier
->used
) {
2848 _mesa_glsl_error(& loc
, state
,
2849 "variable `%s' may not be redeclared "
2850 "`invariant' after being used",
2853 earlier
->invariant
= true;
2857 /* Invariant redeclarations do not have r-values.
2862 assert(this->type
!= NULL
);
2863 assert(!this->invariant
);
2865 /* The type specifier may contain a structure definition. Process that
2866 * before any of the variable declarations.
2868 (void) this->type
->specifier
->hir(instructions
, state
);
2870 decl_type
= this->type
->glsl_type(& type_name
, state
);
2872 /* An offset-qualified atomic counter declaration sets the default
2873 * offset for the next declaration within the same atomic counter
2876 if (decl_type
&& decl_type
->contains_atomic()) {
2877 if (type
->qualifier
.flags
.q
.explicit_binding
&&
2878 type
->qualifier
.flags
.q
.explicit_offset
)
2879 state
->atomic_counter_offsets
[type
->qualifier
.binding
] =
2880 type
->qualifier
.offset
;
2883 if (this->declarations
.is_empty()) {
2884 /* If there is no structure involved in the program text, there are two
2885 * possible scenarios:
2887 * - The program text contained something like 'vec4;'. This is an
2888 * empty declaration. It is valid but weird. Emit a warning.
2890 * - The program text contained something like 'S;' and 'S' is not the
2891 * name of a known structure type. This is both invalid and weird.
2894 * - The program text contained something like 'mediump float;'
2895 * when the programmer probably meant 'precision mediump
2896 * float;' Emit a warning with a description of what they
2897 * probably meant to do.
2899 * Note that if decl_type is NULL and there is a structure involved,
2900 * there must have been some sort of error with the structure. In this
2901 * case we assume that an error was already generated on this line of
2902 * code for the structure. There is no need to generate an additional,
2905 assert(this->type
->specifier
->structure
== NULL
|| decl_type
!= NULL
2908 if (decl_type
== NULL
) {
2909 _mesa_glsl_error(&loc
, state
,
2910 "invalid type `%s' in empty declaration",
2912 } else if (decl_type
->base_type
== GLSL_TYPE_ATOMIC_UINT
) {
2913 /* Empty atomic counter declarations are allowed and useful
2914 * to set the default offset qualifier.
2917 } else if (this->type
->qualifier
.precision
!= ast_precision_none
) {
2918 if (this->type
->specifier
->structure
!= NULL
) {
2919 _mesa_glsl_error(&loc
, state
,
2920 "precision qualifiers can't be applied "
2923 static const char *const precision_names
[] = {
2930 _mesa_glsl_warning(&loc
, state
,
2931 "empty declaration with precision qualifier, "
2932 "to set the default precision, use "
2933 "`precision %s %s;'",
2934 precision_names
[this->type
->qualifier
.precision
],
2938 _mesa_glsl_warning(&loc
, state
, "empty declaration");
2942 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
2943 const struct glsl_type
*var_type
;
2946 /* FINISHME: Emit a warning if a variable declaration shadows a
2947 * FINISHME: declaration at a higher scope.
2950 if ((decl_type
== NULL
) || decl_type
->is_void()) {
2951 if (type_name
!= NULL
) {
2952 _mesa_glsl_error(& loc
, state
,
2953 "invalid type `%s' in declaration of `%s'",
2954 type_name
, decl
->identifier
);
2956 _mesa_glsl_error(& loc
, state
,
2957 "invalid type in declaration of `%s'",
2963 if (decl
->is_array
) {
2964 var_type
= process_array_type(&loc
, decl_type
, decl
->array_size
,
2966 if (var_type
->is_error())
2969 var_type
= decl_type
;
2972 var
= new(ctx
) ir_variable(var_type
, decl
->identifier
, ir_var_auto
);
2974 /* The 'varying in' and 'varying out' qualifiers can only be used with
2975 * ARB_geometry_shader4 and EXT_geometry_shader4, which we don't support
2978 if (this->type
->qualifier
.flags
.q
.varying
) {
2979 if (this->type
->qualifier
.flags
.q
.in
) {
2980 _mesa_glsl_error(& loc
, state
,
2981 "`varying in' qualifier in declaration of "
2982 "`%s' only valid for geometry shaders using "
2983 "ARB_geometry_shader4 or EXT_geometry_shader4",
2985 } else if (this->type
->qualifier
.flags
.q
.out
) {
2986 _mesa_glsl_error(& loc
, state
,
2987 "`varying out' qualifier in declaration of "
2988 "`%s' only valid for geometry shaders using "
2989 "ARB_geometry_shader4 or EXT_geometry_shader4",
2994 /* From page 22 (page 28 of the PDF) of the GLSL 1.10 specification;
2996 * "Global variables can only use the qualifiers const,
2997 * attribute, uni form, or varying. Only one may be
3000 * Local variables can only use the qualifier const."
3002 * This is relaxed in GLSL 1.30 and GLSL ES 3.00. It is also relaxed by
3003 * any extension that adds the 'layout' keyword.
3005 if (!state
->is_version(130, 300)
3006 && !state
->has_explicit_attrib_location()
3007 && !state
->ARB_fragment_coord_conventions_enable
) {
3008 if (this->type
->qualifier
.flags
.q
.out
) {
3009 _mesa_glsl_error(& loc
, state
,
3010 "`out' qualifier in declaration of `%s' "
3011 "only valid for function parameters in %s",
3012 decl
->identifier
, state
->get_version_string());
3014 if (this->type
->qualifier
.flags
.q
.in
) {
3015 _mesa_glsl_error(& loc
, state
,
3016 "`in' qualifier in declaration of `%s' "
3017 "only valid for function parameters in %s",
3018 decl
->identifier
, state
->get_version_string());
3020 /* FINISHME: Test for other invalid qualifiers. */
3023 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
,
3026 if (this->type
->qualifier
.flags
.q
.invariant
) {
3027 if ((state
->target
== vertex_shader
) &&
3028 var
->mode
!= ir_var_shader_out
) {
3029 _mesa_glsl_error(& loc
, state
,
3030 "`%s' cannot be marked invariant, vertex shader "
3031 "outputs only", var
->name
);
3032 } else if ((state
->target
== fragment_shader
) &&
3033 var
->mode
!= ir_var_shader_in
) {
3034 /* FINISHME: Note that this doesn't work for invariant on
3035 * a function signature inval
3037 _mesa_glsl_error(& loc
, state
,
3038 "`%s' cannot be marked invariant, fragment shader "
3039 "inputs only", var
->name
);
3043 if (state
->current_function
!= NULL
) {
3044 const char *mode
= NULL
;
3045 const char *extra
= "";
3047 /* There is no need to check for 'inout' here because the parser will
3048 * only allow that in function parameter lists.
3050 if (this->type
->qualifier
.flags
.q
.attribute
) {
3052 } else if (this->type
->qualifier
.flags
.q
.uniform
) {
3054 } else if (this->type
->qualifier
.flags
.q
.varying
) {
3056 } else if (this->type
->qualifier
.flags
.q
.in
) {
3058 extra
= " or in function parameter list";
3059 } else if (this->type
->qualifier
.flags
.q
.out
) {
3061 extra
= " or in function parameter list";
3065 _mesa_glsl_error(& loc
, state
,
3066 "%s variable `%s' must be declared at "
3068 mode
, var
->name
, extra
);
3070 } else if (var
->mode
== ir_var_shader_in
) {
3071 var
->read_only
= true;
3073 if (state
->target
== vertex_shader
) {
3074 bool error_emitted
= false;
3076 /* From page 31 (page 37 of the PDF) of the GLSL 1.50 spec:
3078 * "Vertex shader inputs can only be float, floating-point
3079 * vectors, matrices, signed and unsigned integers and integer
3080 * vectors. Vertex shader inputs can also form arrays of these
3081 * types, but not structures."
3083 * From page 31 (page 27 of the PDF) of the GLSL 1.30 spec:
3085 * "Vertex shader inputs can only be float, floating-point
3086 * vectors, matrices, signed and unsigned integers and integer
3087 * vectors. They cannot be arrays or structures."
3089 * From page 23 (page 29 of the PDF) of the GLSL 1.20 spec:
3091 * "The attribute qualifier can be used only with float,
3092 * floating-point vectors, and matrices. Attribute variables
3093 * cannot be declared as arrays or structures."
3095 * From page 33 (page 39 of the PDF) of the GLSL ES 3.00 spec:
3097 * "Vertex shader inputs can only be float, floating-point
3098 * vectors, matrices, signed and unsigned integers and integer
3099 * vectors. Vertex shader inputs cannot be arrays or
3102 const glsl_type
*check_type
= var
->type
->is_array()
3103 ? var
->type
->fields
.array
: var
->type
;
3105 switch (check_type
->base_type
) {
3106 case GLSL_TYPE_FLOAT
:
3108 case GLSL_TYPE_UINT
:
3110 if (state
->is_version(120, 300))
3114 _mesa_glsl_error(& loc
, state
,
3115 "vertex shader input / attribute cannot have "
3117 var
->type
->is_array() ? "array of " : "",
3119 error_emitted
= true;
3122 if (!error_emitted
&& var
->type
->is_array() &&
3123 !state
->check_version(150, 0, &loc
,
3124 "vertex shader input / attribute "
3125 "cannot have array type")) {
3126 error_emitted
= true;
3128 } else if (state
->target
== geometry_shader
) {
3129 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
3131 * Geometry shader input variables get the per-vertex values
3132 * written out by vertex shader output variables of the same
3133 * names. Since a geometry shader operates on a set of
3134 * vertices, each input varying variable (or input block, see
3135 * interface blocks below) needs to be declared as an array.
3137 if (!var
->type
->is_array()) {
3138 _mesa_glsl_error(&loc
, state
,
3139 "geometry shader inputs must be arrays");
3142 handle_geometry_shader_input_decl(state
, loc
, var
);
3146 /* Integer fragment inputs must be qualified with 'flat'. In GLSL ES,
3147 * so must integer vertex outputs.
3149 * From section 4.3.4 ("Inputs") of the GLSL 1.50 spec:
3150 * "Fragment shader inputs that are signed or unsigned integers or
3151 * integer vectors must be qualified with the interpolation qualifier
3154 * From section 4.3.4 ("Input Variables") of the GLSL 3.00 ES spec:
3155 * "Fragment shader inputs that are, or contain, signed or unsigned
3156 * integers or integer vectors must be qualified with the
3157 * interpolation qualifier flat."
3159 * From section 4.3.6 ("Output Variables") of the GLSL 3.00 ES spec:
3160 * "Vertex shader outputs that are, or contain, signed or unsigned
3161 * integers or integer vectors must be qualified with the
3162 * interpolation qualifier flat."
3164 * Note that prior to GLSL 1.50, this requirement applied to vertex
3165 * outputs rather than fragment inputs. That creates problems in the
3166 * presence of geometry shaders, so we adopt the GLSL 1.50 rule for all
3167 * desktop GL shaders. For GLSL ES shaders, we follow the spec and
3168 * apply the restriction to both vertex outputs and fragment inputs.
3170 * Note also that the desktop GLSL specs are missing the text "or
3171 * contain"; this is presumably an oversight, since there is no
3172 * reasonable way to interpolate a fragment shader input that contains
3175 if (state
->is_version(130, 300) &&
3176 var
->type
->contains_integer() &&
3177 var
->interpolation
!= INTERP_QUALIFIER_FLAT
&&
3178 ((state
->target
== fragment_shader
&& var
->mode
== ir_var_shader_in
)
3179 || (state
->target
== vertex_shader
&& var
->mode
== ir_var_shader_out
3180 && state
->es_shader
))) {
3181 const char *var_type
= (state
->target
== vertex_shader
) ?
3182 "vertex output" : "fragment input";
3183 _mesa_glsl_error(&loc
, state
, "if a %s is (or contains) "
3184 "an integer, then it must be qualified with 'flat'",
3189 /* Interpolation qualifiers cannot be applied to 'centroid' and
3190 * 'centroid varying'.
3192 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
3193 * "interpolation qualifiers may only precede the qualifiers in,
3194 * centroid in, out, or centroid out in a declaration. They do not apply
3195 * to the deprecated storage qualifiers varying or centroid varying."
3197 * These deprecated storage qualifiers do not exist in GLSL ES 3.00.
3199 if (state
->is_version(130, 0)
3200 && this->type
->qualifier
.has_interpolation()
3201 && this->type
->qualifier
.flags
.q
.varying
) {
3203 const char *i
= this->type
->qualifier
.interpolation_string();
3206 if (this->type
->qualifier
.flags
.q
.centroid
)
3207 s
= "centroid varying";
3211 _mesa_glsl_error(&loc
, state
,
3212 "qualifier '%s' cannot be applied to the "
3213 "deprecated storage qualifier '%s'", i
, s
);
3217 /* Interpolation qualifiers can only apply to vertex shader outputs and
3218 * fragment shader inputs.
3220 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
3221 * "Outputs from a vertex shader (out) and inputs to a fragment
3222 * shader (in) can be further qualified with one or more of these
3223 * interpolation qualifiers"
3225 * From page 31 (page 37 of the PDF) of the GLSL ES 3.00 spec:
3226 * "These interpolation qualifiers may only precede the qualifiers
3227 * in, centroid in, out, or centroid out in a declaration. They do
3228 * not apply to inputs into a vertex shader or outputs from a
3231 if (state
->is_version(130, 300)
3232 && this->type
->qualifier
.has_interpolation()) {
3234 const char *i
= this->type
->qualifier
.interpolation_string();
3237 switch (state
->target
) {
3239 if (this->type
->qualifier
.flags
.q
.in
) {
3240 _mesa_glsl_error(&loc
, state
,
3241 "qualifier '%s' cannot be applied to vertex "
3242 "shader inputs", i
);
3245 case fragment_shader
:
3246 if (this->type
->qualifier
.flags
.q
.out
) {
3247 _mesa_glsl_error(&loc
, state
,
3248 "qualifier '%s' cannot be applied to fragment "
3249 "shader outputs", i
);
3258 /* From section 4.3.4 of the GLSL 1.30 spec:
3259 * "It is an error to use centroid in in a vertex shader."
3261 * From section 4.3.4 of the GLSL ES 3.00 spec:
3262 * "It is an error to use centroid in or interpolation qualifiers in
3263 * a vertex shader input."
3265 if (state
->is_version(130, 300)
3266 && this->type
->qualifier
.flags
.q
.centroid
3267 && this->type
->qualifier
.flags
.q
.in
3268 && state
->target
== vertex_shader
) {
3270 _mesa_glsl_error(&loc
, state
,
3271 "'centroid in' cannot be used in a vertex shader");
3274 /* Section 4.3.6 of the GLSL 1.30 specification states:
3275 * "It is an error to use centroid out in a fragment shader."
3277 * The GL_ARB_shading_language_420pack extension specification states:
3278 * "It is an error to use auxiliary storage qualifiers or interpolation
3279 * qualifiers on an output in a fragment shader."
3281 if (state
->target
== fragment_shader
&&
3282 this->type
->qualifier
.flags
.q
.out
&&
3283 this->type
->qualifier
.has_auxiliary_storage()) {
3284 _mesa_glsl_error(&loc
, state
,
3285 "auxiliary storage qualifiers cannot be used on "
3286 "fragment shader outputs");
3289 /* Precision qualifiers exists only in GLSL versions 1.00 and >= 1.30.
3291 if (this->type
->qualifier
.precision
!= ast_precision_none
) {
3292 state
->check_precision_qualifiers_allowed(&loc
);
3296 /* Precision qualifiers apply to floating point, integer and sampler
3299 * Section 4.5.2 (Precision Qualifiers) of the GLSL 1.30 spec says:
3300 * "Any floating point or any integer declaration can have the type
3301 * preceded by one of these precision qualifiers [...] Literal
3302 * constants do not have precision qualifiers. Neither do Boolean
3305 * Section 4.5 (Precision and Precision Qualifiers) of the GLSL 1.30
3308 * "Precision qualifiers are added for code portability with OpenGL
3309 * ES, not for functionality. They have the same syntax as in OpenGL
3312 * Section 8 (Built-In Functions) of the GLSL ES 1.00 spec says:
3314 * "uniform lowp sampler2D sampler;
3317 * lowp vec4 col = texture2D (sampler, coord);
3318 * // texture2D returns lowp"
3320 * From this, we infer that GLSL 1.30 (and later) should allow precision
3321 * qualifiers on sampler types just like float and integer types.
3323 if (this->type
->qualifier
.precision
!= ast_precision_none
3324 && !var
->type
->is_float()
3325 && !var
->type
->is_integer()
3326 && !var
->type
->is_record()
3327 && !var
->type
->is_sampler()
3328 && !(var
->type
->is_array()
3329 && (var
->type
->fields
.array
->is_float()
3330 || var
->type
->fields
.array
->is_integer()))) {
3332 _mesa_glsl_error(&loc
, state
,
3333 "precision qualifiers apply only to floating point"
3334 ", integer and sampler types");
3337 /* From page 17 (page 23 of the PDF) of the GLSL 1.20 spec:
3339 * "[Sampler types] can only be declared as function
3340 * parameters or uniform variables (see Section 4.3.5
3343 if (var_type
->contains_sampler() &&
3344 !this->type
->qualifier
.flags
.q
.uniform
) {
3345 _mesa_glsl_error(&loc
, state
, "samplers must be declared uniform");
3348 /* Process the initializer and add its instructions to a temporary
3349 * list. This list will be added to the instruction stream (below) after
3350 * the declaration is added. This is done because in some cases (such as
3351 * redeclarations) the declaration may not actually be added to the
3352 * instruction stream.
3354 exec_list initializer_instructions
;
3355 ir_variable
*earlier
=
3356 get_variable_being_redeclared(var
, decl
->get_location(), state
,
3357 false /* allow_all_redeclarations */);
3359 if (decl
->initializer
!= NULL
) {
3360 result
= process_initializer((earlier
== NULL
) ? var
: earlier
,
3362 &initializer_instructions
, state
);
3365 /* From page 23 (page 29 of the PDF) of the GLSL 1.10 spec:
3367 * "It is an error to write to a const variable outside of
3368 * its declaration, so they must be initialized when
3371 if (this->type
->qualifier
.flags
.q
.constant
&& decl
->initializer
== NULL
) {
3372 _mesa_glsl_error(& loc
, state
,
3373 "const declaration of `%s' must be initialized",
3377 if (state
->es_shader
) {
3378 const glsl_type
*const t
= (earlier
== NULL
)
3379 ? var
->type
: earlier
->type
;
3381 if (t
->is_unsized_array())
3382 /* Section 10.17 of the GLSL ES 1.00 specification states that
3383 * unsized array declarations have been removed from the language.
3384 * Arrays that are sized using an initializer are still explicitly
3385 * sized. However, GLSL ES 1.00 does not allow array
3386 * initializers. That is only allowed in GLSL ES 3.00.
3388 * Section 4.1.9 (Arrays) of the GLSL ES 3.00 spec says:
3390 * "An array type can also be formed without specifying a size
3391 * if the definition includes an initializer:
3393 * float x[] = float[2] (1.0, 2.0); // declares an array of size 2
3394 * float y[] = float[] (1.0, 2.0, 3.0); // declares an array of size 3
3399 _mesa_glsl_error(& loc
, state
,
3400 "unsized array declarations are not allowed in "
3404 /* If the declaration is not a redeclaration, there are a few additional
3405 * semantic checks that must be applied. In addition, variable that was
3406 * created for the declaration should be added to the IR stream.
3408 if (earlier
== NULL
) {
3409 validate_identifier(decl
->identifier
, loc
, state
);
3411 /* Add the variable to the symbol table. Note that the initializer's
3412 * IR was already processed earlier (though it hasn't been emitted
3413 * yet), without the variable in scope.
3415 * This differs from most C-like languages, but it follows the GLSL
3416 * specification. From page 28 (page 34 of the PDF) of the GLSL 1.50
3419 * "Within a declaration, the scope of a name starts immediately
3420 * after the initializer if present or immediately after the name
3421 * being declared if not."
3423 if (!state
->symbols
->add_variable(var
)) {
3424 YYLTYPE loc
= this->get_location();
3425 _mesa_glsl_error(&loc
, state
, "name `%s' already taken in the "
3426 "current scope", decl
->identifier
);
3430 /* Push the variable declaration to the top. It means that all the
3431 * variable declarations will appear in a funny last-to-first order,
3432 * but otherwise we run into trouble if a function is prototyped, a
3433 * global var is decled, then the function is defined with usage of
3434 * the global var. See glslparsertest's CorrectModule.frag.
3436 instructions
->push_head(var
);
3439 instructions
->append_list(&initializer_instructions
);
3443 /* Generally, variable declarations do not have r-values. However,
3444 * one is used for the declaration in
3446 * while (bool b = some_condition()) {
3450 * so we return the rvalue from the last seen declaration here.
3457 ast_parameter_declarator::hir(exec_list
*instructions
,
3458 struct _mesa_glsl_parse_state
*state
)
3461 const struct glsl_type
*type
;
3462 const char *name
= NULL
;
3463 YYLTYPE loc
= this->get_location();
3465 type
= this->type
->glsl_type(& name
, state
);
3469 _mesa_glsl_error(& loc
, state
,
3470 "invalid type `%s' in declaration of `%s'",
3471 name
, this->identifier
);
3473 _mesa_glsl_error(& loc
, state
,
3474 "invalid type in declaration of `%s'",
3478 type
= glsl_type::error_type
;
3481 /* From page 62 (page 68 of the PDF) of the GLSL 1.50 spec:
3483 * "Functions that accept no input arguments need not use void in the
3484 * argument list because prototypes (or definitions) are required and
3485 * therefore there is no ambiguity when an empty argument list "( )" is
3486 * declared. The idiom "(void)" as a parameter list is provided for
3489 * Placing this check here prevents a void parameter being set up
3490 * for a function, which avoids tripping up checks for main taking
3491 * parameters and lookups of an unnamed symbol.
3493 if (type
->is_void()) {
3494 if (this->identifier
!= NULL
)
3495 _mesa_glsl_error(& loc
, state
,
3496 "named parameter cannot have type `void'");
3502 if (formal_parameter
&& (this->identifier
== NULL
)) {
3503 _mesa_glsl_error(& loc
, state
, "formal parameter lacks a name");
3507 /* This only handles "vec4 foo[..]". The earlier specifier->glsl_type(...)
3508 * call already handled the "vec4[..] foo" case.
3510 if (this->is_array
) {
3511 type
= process_array_type(&loc
, type
, this->array_size
, state
);
3514 if (!type
->is_error() && type
->is_unsized_array()) {
3515 _mesa_glsl_error(&loc
, state
, "arrays passed as parameters must have "
3517 type
= glsl_type::error_type
;
3521 ir_variable
*var
= new(ctx
)
3522 ir_variable(type
, this->identifier
, ir_var_function_in
);
3524 /* Apply any specified qualifiers to the parameter declaration. Note that
3525 * for function parameters the default mode is 'in'.
3527 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
, & loc
,
3530 /* From page 17 (page 23 of the PDF) of the GLSL 1.20 spec:
3532 * "Samplers cannot be treated as l-values; hence cannot be used
3533 * as out or inout function parameters, nor can they be assigned
3536 if ((var
->mode
== ir_var_function_inout
|| var
->mode
== ir_var_function_out
)
3537 && type
->contains_sampler()) {
3538 _mesa_glsl_error(&loc
, state
, "out and inout parameters cannot contain samplers");
3539 type
= glsl_type::error_type
;
3542 /* From page 39 (page 45 of the PDF) of the GLSL 1.10 spec:
3544 * "When calling a function, expressions that do not evaluate to
3545 * l-values cannot be passed to parameters declared as out or inout."
3547 * From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
3549 * "Other binary or unary expressions, non-dereferenced arrays,
3550 * function names, swizzles with repeated fields, and constants
3551 * cannot be l-values."
3553 * So for GLSL 1.10, passing an array as an out or inout parameter is not
3554 * allowed. This restriction is removed in GLSL 1.20, and in GLSL ES.
3556 if ((var
->mode
== ir_var_function_inout
|| var
->mode
== ir_var_function_out
)
3558 && !state
->check_version(120, 100, &loc
,
3559 "arrays cannot be out or inout parameters")) {
3560 type
= glsl_type::error_type
;
3563 instructions
->push_tail(var
);
3565 /* Parameter declarations do not have r-values.
3572 ast_parameter_declarator::parameters_to_hir(exec_list
*ast_parameters
,
3574 exec_list
*ir_parameters
,
3575 _mesa_glsl_parse_state
*state
)
3577 ast_parameter_declarator
*void_param
= NULL
;
3580 foreach_list_typed (ast_parameter_declarator
, param
, link
, ast_parameters
) {
3581 param
->formal_parameter
= formal
;
3582 param
->hir(ir_parameters
, state
);
3590 if ((void_param
!= NULL
) && (count
> 1)) {
3591 YYLTYPE loc
= void_param
->get_location();
3593 _mesa_glsl_error(& loc
, state
,
3594 "`void' parameter must be only parameter");
3600 emit_function(_mesa_glsl_parse_state
*state
, ir_function
*f
)
3602 /* IR invariants disallow function declarations or definitions
3603 * nested within other function definitions. But there is no
3604 * requirement about the relative order of function declarations
3605 * and definitions with respect to one another. So simply insert
3606 * the new ir_function block at the end of the toplevel instruction
3609 state
->toplevel_ir
->push_tail(f
);
3614 ast_function::hir(exec_list
*instructions
,
3615 struct _mesa_glsl_parse_state
*state
)
3618 ir_function
*f
= NULL
;
3619 ir_function_signature
*sig
= NULL
;
3620 exec_list hir_parameters
;
3622 const char *const name
= identifier
;
3624 /* New functions are always added to the top-level IR instruction stream,
3625 * so this instruction list pointer is ignored. See also emit_function
3628 (void) instructions
;
3630 /* From page 21 (page 27 of the PDF) of the GLSL 1.20 spec,
3632 * "Function declarations (prototypes) cannot occur inside of functions;
3633 * they must be at global scope, or for the built-in functions, outside
3634 * the global scope."
3636 * From page 27 (page 33 of the PDF) of the GLSL ES 1.00.16 spec,
3638 * "User defined functions may only be defined within the global scope."
3640 * Note that this language does not appear in GLSL 1.10.
3642 if ((state
->current_function
!= NULL
) &&
3643 state
->is_version(120, 100)) {
3644 YYLTYPE loc
= this->get_location();
3645 _mesa_glsl_error(&loc
, state
,
3646 "declaration of function `%s' not allowed within "
3647 "function body", name
);
3650 validate_identifier(name
, this->get_location(), state
);
3652 /* Convert the list of function parameters to HIR now so that they can be
3653 * used below to compare this function's signature with previously seen
3654 * signatures for functions with the same name.
3656 ast_parameter_declarator::parameters_to_hir(& this->parameters
,
3658 & hir_parameters
, state
);
3660 const char *return_type_name
;
3661 const glsl_type
*return_type
=
3662 this->return_type
->glsl_type(& return_type_name
, state
);
3665 YYLTYPE loc
= this->get_location();
3666 _mesa_glsl_error(&loc
, state
,
3667 "function `%s' has undeclared return type `%s'",
3668 name
, return_type_name
);
3669 return_type
= glsl_type::error_type
;
3672 /* From page 56 (page 62 of the PDF) of the GLSL 1.30 spec:
3673 * "No qualifier is allowed on the return type of a function."
3675 if (this->return_type
->has_qualifiers()) {
3676 YYLTYPE loc
= this->get_location();
3677 _mesa_glsl_error(& loc
, state
,
3678 "function `%s' return type has qualifiers", name
);
3681 /* Section 6.1 (Function Definitions) of the GLSL 1.20 spec says:
3683 * "Arrays are allowed as arguments and as the return type. In both
3684 * cases, the array must be explicitly sized."
3686 if (return_type
->is_unsized_array()) {
3687 YYLTYPE loc
= this->get_location();
3688 _mesa_glsl_error(& loc
, state
,
3689 "function `%s' return type array must be explicitly "
3693 /* From page 17 (page 23 of the PDF) of the GLSL 1.20 spec:
3695 * "[Sampler types] can only be declared as function parameters
3696 * or uniform variables (see Section 4.3.5 "Uniform")".
3698 if (return_type
->contains_sampler()) {
3699 YYLTYPE loc
= this->get_location();
3700 _mesa_glsl_error(&loc
, state
,
3701 "function `%s' return type can't contain a sampler",
3705 /* Verify that this function's signature either doesn't match a previously
3706 * seen signature for a function with the same name, or, if a match is found,
3707 * that the previously seen signature does not have an associated definition.
3709 f
= state
->symbols
->get_function(name
);
3710 if (f
!= NULL
&& (state
->es_shader
|| f
->has_user_signature())) {
3711 sig
= f
->exact_matching_signature(state
, &hir_parameters
);
3713 const char *badvar
= sig
->qualifiers_match(&hir_parameters
);
3714 if (badvar
!= NULL
) {
3715 YYLTYPE loc
= this->get_location();
3717 _mesa_glsl_error(&loc
, state
, "function `%s' parameter `%s' "
3718 "qualifiers don't match prototype", name
, badvar
);
3721 if (sig
->return_type
!= return_type
) {
3722 YYLTYPE loc
= this->get_location();
3724 _mesa_glsl_error(&loc
, state
, "function `%s' return type doesn't "
3725 "match prototype", name
);
3728 if (sig
->is_defined
) {
3729 if (is_definition
) {
3730 YYLTYPE loc
= this->get_location();
3731 _mesa_glsl_error(& loc
, state
, "function `%s' redefined", name
);
3733 /* We just encountered a prototype that exactly matches a
3734 * function that's already been defined. This is redundant,
3735 * and we should ignore it.
3742 f
= new(ctx
) ir_function(name
);
3743 if (!state
->symbols
->add_function(f
)) {
3744 /* This function name shadows a non-function use of the same name. */
3745 YYLTYPE loc
= this->get_location();
3747 _mesa_glsl_error(&loc
, state
, "function name `%s' conflicts with "
3748 "non-function", name
);
3752 emit_function(state
, f
);
3755 /* Verify the return type of main() */
3756 if (strcmp(name
, "main") == 0) {
3757 if (! return_type
->is_void()) {
3758 YYLTYPE loc
= this->get_location();
3760 _mesa_glsl_error(& loc
, state
, "main() must return void");
3763 if (!hir_parameters
.is_empty()) {
3764 YYLTYPE loc
= this->get_location();
3766 _mesa_glsl_error(& loc
, state
, "main() must not take any parameters");
3770 /* Finish storing the information about this new function in its signature.
3773 sig
= new(ctx
) ir_function_signature(return_type
);
3774 f
->add_signature(sig
);
3777 sig
->replace_parameters(&hir_parameters
);
3780 /* Function declarations (prototypes) do not have r-values.
3787 ast_function_definition::hir(exec_list
*instructions
,
3788 struct _mesa_glsl_parse_state
*state
)
3790 prototype
->is_definition
= true;
3791 prototype
->hir(instructions
, state
);
3793 ir_function_signature
*signature
= prototype
->signature
;
3794 if (signature
== NULL
)
3797 assert(state
->current_function
== NULL
);
3798 state
->current_function
= signature
;
3799 state
->found_return
= false;
3801 /* Duplicate parameters declared in the prototype as concrete variables.
3802 * Add these to the symbol table.
3804 state
->symbols
->push_scope();
3805 foreach_iter(exec_list_iterator
, iter
, signature
->parameters
) {
3806 ir_variable
*const var
= ((ir_instruction
*) iter
.get())->as_variable();
3808 assert(var
!= NULL
);
3810 /* The only way a parameter would "exist" is if two parameters have
3813 if (state
->symbols
->name_declared_this_scope(var
->name
)) {
3814 YYLTYPE loc
= this->get_location();
3816 _mesa_glsl_error(& loc
, state
, "parameter `%s' redeclared", var
->name
);
3818 state
->symbols
->add_variable(var
);
3822 /* Convert the body of the function to HIR. */
3823 this->body
->hir(&signature
->body
, state
);
3824 signature
->is_defined
= true;
3826 state
->symbols
->pop_scope();
3828 assert(state
->current_function
== signature
);
3829 state
->current_function
= NULL
;
3831 if (!signature
->return_type
->is_void() && !state
->found_return
) {
3832 YYLTYPE loc
= this->get_location();
3833 _mesa_glsl_error(& loc
, state
, "function `%s' has non-void return type "
3834 "%s, but no return statement",
3835 signature
->function_name(),
3836 signature
->return_type
->name
);
3839 /* Function definitions do not have r-values.
3846 ast_jump_statement::hir(exec_list
*instructions
,
3847 struct _mesa_glsl_parse_state
*state
)
3854 assert(state
->current_function
);
3856 if (opt_return_value
) {
3857 ir_rvalue
*ret
= opt_return_value
->hir(instructions
, state
);
3859 /* The value of the return type can be NULL if the shader says
3860 * 'return foo();' and foo() is a function that returns void.
3862 * NOTE: The GLSL spec doesn't say that this is an error. The type
3863 * of the return value is void. If the return type of the function is
3864 * also void, then this should compile without error. Seriously.
3866 const glsl_type
*const ret_type
=
3867 (ret
== NULL
) ? glsl_type::void_type
: ret
->type
;
3869 /* Implicit conversions are not allowed for return values prior to
3870 * ARB_shading_language_420pack.
3872 if (state
->current_function
->return_type
!= ret_type
) {
3873 YYLTYPE loc
= this->get_location();
3875 if (state
->ARB_shading_language_420pack_enable
) {
3876 if (!apply_implicit_conversion(state
->current_function
->return_type
,
3878 _mesa_glsl_error(& loc
, state
,
3879 "could not implicitly convert return value "
3880 "to %s, in function `%s'",
3881 state
->current_function
->return_type
->name
,
3882 state
->current_function
->function_name());
3885 _mesa_glsl_error(& loc
, state
,
3886 "`return' with wrong type %s, in function `%s' "
3889 state
->current_function
->function_name(),
3890 state
->current_function
->return_type
->name
);
3892 } else if (state
->current_function
->return_type
->base_type
==
3894 YYLTYPE loc
= this->get_location();
3896 /* The ARB_shading_language_420pack, GLSL ES 3.0, and GLSL 4.20
3897 * specs add a clarification:
3899 * "A void function can only use return without a return argument, even if
3900 * the return argument has void type. Return statements only accept values:
3903 * void func2() { return func1(); } // illegal return statement"
3905 _mesa_glsl_error(& loc
, state
,
3906 "void functions can only use `return' without a "
3910 inst
= new(ctx
) ir_return(ret
);
3912 if (state
->current_function
->return_type
->base_type
!=
3914 YYLTYPE loc
= this->get_location();
3916 _mesa_glsl_error(& loc
, state
,
3917 "`return' with no value, in function %s returning "
3919 state
->current_function
->function_name());
3921 inst
= new(ctx
) ir_return
;
3924 state
->found_return
= true;
3925 instructions
->push_tail(inst
);
3930 if (state
->target
!= fragment_shader
) {
3931 YYLTYPE loc
= this->get_location();
3933 _mesa_glsl_error(& loc
, state
,
3934 "`discard' may only appear in a fragment shader");
3936 instructions
->push_tail(new(ctx
) ir_discard
);
3941 if (mode
== ast_continue
&&
3942 state
->loop_nesting_ast
== NULL
) {
3943 YYLTYPE loc
= this->get_location();
3945 _mesa_glsl_error(& loc
, state
,
3946 "continue may only appear in a loop");
3947 } else if (mode
== ast_break
&&
3948 state
->loop_nesting_ast
== NULL
&&
3949 state
->switch_state
.switch_nesting_ast
== NULL
) {
3950 YYLTYPE loc
= this->get_location();
3952 _mesa_glsl_error(& loc
, state
,
3953 "break may only appear in a loop or a switch");
3955 /* For a loop, inline the for loop expression again,
3956 * since we don't know where near the end of
3957 * the loop body the normal copy of it
3958 * is going to be placed.
3960 if (state
->loop_nesting_ast
!= NULL
&&
3961 mode
== ast_continue
&&
3962 state
->loop_nesting_ast
->rest_expression
) {
3963 state
->loop_nesting_ast
->rest_expression
->hir(instructions
,
3967 if (state
->switch_state
.is_switch_innermost
&&
3968 mode
== ast_break
) {
3969 /* Force break out of switch by setting is_break switch state.
3971 ir_variable
*const is_break_var
= state
->switch_state
.is_break_var
;
3972 ir_dereference_variable
*const deref_is_break_var
=
3973 new(ctx
) ir_dereference_variable(is_break_var
);
3974 ir_constant
*const true_val
= new(ctx
) ir_constant(true);
3975 ir_assignment
*const set_break_var
=
3976 new(ctx
) ir_assignment(deref_is_break_var
, true_val
);
3978 instructions
->push_tail(set_break_var
);
3981 ir_loop_jump
*const jump
=
3982 new(ctx
) ir_loop_jump((mode
== ast_break
)
3983 ? ir_loop_jump::jump_break
3984 : ir_loop_jump::jump_continue
);
3985 instructions
->push_tail(jump
);
3992 /* Jump instructions do not have r-values.
3999 ast_selection_statement::hir(exec_list
*instructions
,
4000 struct _mesa_glsl_parse_state
*state
)
4004 ir_rvalue
*const condition
= this->condition
->hir(instructions
, state
);
4006 /* From page 66 (page 72 of the PDF) of the GLSL 1.50 spec:
4008 * "Any expression whose type evaluates to a Boolean can be used as the
4009 * conditional expression bool-expression. Vector types are not accepted
4010 * as the expression to if."
4012 * The checks are separated so that higher quality diagnostics can be
4013 * generated for cases where both rules are violated.
4015 if (!condition
->type
->is_boolean() || !condition
->type
->is_scalar()) {
4016 YYLTYPE loc
= this->condition
->get_location();
4018 _mesa_glsl_error(& loc
, state
, "if-statement condition must be scalar "
4022 ir_if
*const stmt
= new(ctx
) ir_if(condition
);
4024 if (then_statement
!= NULL
) {
4025 state
->symbols
->push_scope();
4026 then_statement
->hir(& stmt
->then_instructions
, state
);
4027 state
->symbols
->pop_scope();
4030 if (else_statement
!= NULL
) {
4031 state
->symbols
->push_scope();
4032 else_statement
->hir(& stmt
->else_instructions
, state
);
4033 state
->symbols
->pop_scope();
4036 instructions
->push_tail(stmt
);
4038 /* if-statements do not have r-values.
4045 ast_switch_statement::hir(exec_list
*instructions
,
4046 struct _mesa_glsl_parse_state
*state
)
4050 ir_rvalue
*const test_expression
=
4051 this->test_expression
->hir(instructions
, state
);
4053 /* From page 66 (page 55 of the PDF) of the GLSL 1.50 spec:
4055 * "The type of init-expression in a switch statement must be a
4058 if (!test_expression
->type
->is_scalar() ||
4059 !test_expression
->type
->is_integer()) {
4060 YYLTYPE loc
= this->test_expression
->get_location();
4062 _mesa_glsl_error(& loc
,
4064 "switch-statement expression must be scalar "
4068 /* Track the switch-statement nesting in a stack-like manner.
4070 struct glsl_switch_state saved
= state
->switch_state
;
4072 state
->switch_state
.is_switch_innermost
= true;
4073 state
->switch_state
.switch_nesting_ast
= this;
4074 state
->switch_state
.labels_ht
= hash_table_ctor(0, hash_table_pointer_hash
,
4075 hash_table_pointer_compare
);
4076 state
->switch_state
.previous_default
= NULL
;
4078 /* Initalize is_fallthru state to false.
4080 ir_rvalue
*const is_fallthru_val
= new (ctx
) ir_constant(false);
4081 state
->switch_state
.is_fallthru_var
=
4082 new(ctx
) ir_variable(glsl_type::bool_type
,
4083 "switch_is_fallthru_tmp",
4085 instructions
->push_tail(state
->switch_state
.is_fallthru_var
);
4087 ir_dereference_variable
*deref_is_fallthru_var
=
4088 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
4089 instructions
->push_tail(new(ctx
) ir_assignment(deref_is_fallthru_var
,
4092 /* Initalize is_break state to false.
4094 ir_rvalue
*const is_break_val
= new (ctx
) ir_constant(false);
4095 state
->switch_state
.is_break_var
= new(ctx
) ir_variable(glsl_type::bool_type
,
4096 "switch_is_break_tmp",
4098 instructions
->push_tail(state
->switch_state
.is_break_var
);
4100 ir_dereference_variable
*deref_is_break_var
=
4101 new(ctx
) ir_dereference_variable(state
->switch_state
.is_break_var
);
4102 instructions
->push_tail(new(ctx
) ir_assignment(deref_is_break_var
,
4105 /* Cache test expression.
4107 test_to_hir(instructions
, state
);
4109 /* Emit code for body of switch stmt.
4111 body
->hir(instructions
, state
);
4113 hash_table_dtor(state
->switch_state
.labels_ht
);
4115 state
->switch_state
= saved
;
4117 /* Switch statements do not have r-values. */
4123 ast_switch_statement::test_to_hir(exec_list
*instructions
,
4124 struct _mesa_glsl_parse_state
*state
)
4128 /* Cache value of test expression. */
4129 ir_rvalue
*const test_val
=
4130 test_expression
->hir(instructions
,
4133 state
->switch_state
.test_var
= new(ctx
) ir_variable(test_val
->type
,
4136 ir_dereference_variable
*deref_test_var
=
4137 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
4139 instructions
->push_tail(state
->switch_state
.test_var
);
4140 instructions
->push_tail(new(ctx
) ir_assignment(deref_test_var
, test_val
));
4145 ast_switch_body::hir(exec_list
*instructions
,
4146 struct _mesa_glsl_parse_state
*state
)
4149 stmts
->hir(instructions
, state
);
4151 /* Switch bodies do not have r-values. */
4156 ast_case_statement_list::hir(exec_list
*instructions
,
4157 struct _mesa_glsl_parse_state
*state
)
4159 foreach_list_typed (ast_case_statement
, case_stmt
, link
, & this->cases
)
4160 case_stmt
->hir(instructions
, state
);
4162 /* Case statements do not have r-values. */
4167 ast_case_statement::hir(exec_list
*instructions
,
4168 struct _mesa_glsl_parse_state
*state
)
4170 labels
->hir(instructions
, state
);
4172 /* Conditionally set fallthru state based on break state. */
4173 ir_constant
*const false_val
= new(state
) ir_constant(false);
4174 ir_dereference_variable
*const deref_is_fallthru_var
=
4175 new(state
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
4176 ir_dereference_variable
*const deref_is_break_var
=
4177 new(state
) ir_dereference_variable(state
->switch_state
.is_break_var
);
4178 ir_assignment
*const reset_fallthru_on_break
=
4179 new(state
) ir_assignment(deref_is_fallthru_var
,
4181 deref_is_break_var
);
4182 instructions
->push_tail(reset_fallthru_on_break
);
4184 /* Guard case statements depending on fallthru state. */
4185 ir_dereference_variable
*const deref_fallthru_guard
=
4186 new(state
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
4187 ir_if
*const test_fallthru
= new(state
) ir_if(deref_fallthru_guard
);
4189 foreach_list_typed (ast_node
, stmt
, link
, & this->stmts
)
4190 stmt
->hir(& test_fallthru
->then_instructions
, state
);
4192 instructions
->push_tail(test_fallthru
);
4194 /* Case statements do not have r-values. */
4200 ast_case_label_list::hir(exec_list
*instructions
,
4201 struct _mesa_glsl_parse_state
*state
)
4203 foreach_list_typed (ast_case_label
, label
, link
, & this->labels
)
4204 label
->hir(instructions
, state
);
4206 /* Case labels do not have r-values. */
4211 ast_case_label::hir(exec_list
*instructions
,
4212 struct _mesa_glsl_parse_state
*state
)
4216 ir_dereference_variable
*deref_fallthru_var
=
4217 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
4219 ir_rvalue
*const true_val
= new(ctx
) ir_constant(true);
4221 /* If not default case, ... */
4222 if (this->test_value
!= NULL
) {
4223 /* Conditionally set fallthru state based on
4224 * comparison of cached test expression value to case label.
4226 ir_rvalue
*const label_rval
= this->test_value
->hir(instructions
, state
);
4227 ir_constant
*label_const
= label_rval
->constant_expression_value();
4230 YYLTYPE loc
= this->test_value
->get_location();
4232 _mesa_glsl_error(& loc
, state
,
4233 "switch statement case label must be a "
4234 "constant expression");
4236 /* Stuff a dummy value in to allow processing to continue. */
4237 label_const
= new(ctx
) ir_constant(0);
4239 ast_expression
*previous_label
= (ast_expression
*)
4240 hash_table_find(state
->switch_state
.labels_ht
,
4241 (void *)(uintptr_t)label_const
->value
.u
[0]);
4243 if (previous_label
) {
4244 YYLTYPE loc
= this->test_value
->get_location();
4245 _mesa_glsl_error(& loc
, state
,
4246 "duplicate case value");
4248 loc
= previous_label
->get_location();
4249 _mesa_glsl_error(& loc
, state
,
4250 "this is the previous case label");
4252 hash_table_insert(state
->switch_state
.labels_ht
,
4254 (void *)(uintptr_t)label_const
->value
.u
[0]);
4258 ir_dereference_variable
*deref_test_var
=
4259 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
4261 ir_rvalue
*const test_cond
= new(ctx
) ir_expression(ir_binop_all_equal
,
4265 ir_assignment
*set_fallthru_on_test
=
4266 new(ctx
) ir_assignment(deref_fallthru_var
,
4270 instructions
->push_tail(set_fallthru_on_test
);
4271 } else { /* default case */
4272 if (state
->switch_state
.previous_default
) {
4273 YYLTYPE loc
= this->get_location();
4274 _mesa_glsl_error(& loc
, state
,
4275 "multiple default labels in one switch");
4277 loc
= state
->switch_state
.previous_default
->get_location();
4278 _mesa_glsl_error(& loc
, state
,
4279 "this is the first default label");
4281 state
->switch_state
.previous_default
= this;
4283 /* Set falltrhu state. */
4284 ir_assignment
*set_fallthru
=
4285 new(ctx
) ir_assignment(deref_fallthru_var
, true_val
);
4287 instructions
->push_tail(set_fallthru
);
4290 /* Case statements do not have r-values. */
4295 ast_iteration_statement::condition_to_hir(ir_loop
*stmt
,
4296 struct _mesa_glsl_parse_state
*state
)
4300 if (condition
!= NULL
) {
4301 ir_rvalue
*const cond
=
4302 condition
->hir(& stmt
->body_instructions
, state
);
4305 || !cond
->type
->is_boolean() || !cond
->type
->is_scalar()) {
4306 YYLTYPE loc
= condition
->get_location();
4308 _mesa_glsl_error(& loc
, state
,
4309 "loop condition must be scalar boolean");
4311 /* As the first code in the loop body, generate a block that looks
4312 * like 'if (!condition) break;' as the loop termination condition.
4314 ir_rvalue
*const not_cond
=
4315 new(ctx
) ir_expression(ir_unop_logic_not
, cond
);
4317 ir_if
*const if_stmt
= new(ctx
) ir_if(not_cond
);
4319 ir_jump
*const break_stmt
=
4320 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
4322 if_stmt
->then_instructions
.push_tail(break_stmt
);
4323 stmt
->body_instructions
.push_tail(if_stmt
);
4330 ast_iteration_statement::hir(exec_list
*instructions
,
4331 struct _mesa_glsl_parse_state
*state
)
4335 /* For-loops and while-loops start a new scope, but do-while loops do not.
4337 if (mode
!= ast_do_while
)
4338 state
->symbols
->push_scope();
4340 if (init_statement
!= NULL
)
4341 init_statement
->hir(instructions
, state
);
4343 ir_loop
*const stmt
= new(ctx
) ir_loop();
4344 instructions
->push_tail(stmt
);
4346 /* Track the current loop nesting. */
4347 ast_iteration_statement
*nesting_ast
= state
->loop_nesting_ast
;
4349 state
->loop_nesting_ast
= this;
4351 /* Likewise, indicate that following code is closest to a loop,
4352 * NOT closest to a switch.
4354 bool saved_is_switch_innermost
= state
->switch_state
.is_switch_innermost
;
4355 state
->switch_state
.is_switch_innermost
= false;
4357 if (mode
!= ast_do_while
)
4358 condition_to_hir(stmt
, state
);
4361 body
->hir(& stmt
->body_instructions
, state
);
4363 if (rest_expression
!= NULL
)
4364 rest_expression
->hir(& stmt
->body_instructions
, state
);
4366 if (mode
== ast_do_while
)
4367 condition_to_hir(stmt
, state
);
4369 if (mode
!= ast_do_while
)
4370 state
->symbols
->pop_scope();
4372 /* Restore previous nesting before returning. */
4373 state
->loop_nesting_ast
= nesting_ast
;
4374 state
->switch_state
.is_switch_innermost
= saved_is_switch_innermost
;
4376 /* Loops do not have r-values.
4383 * Determine if the given type is valid for establishing a default precision
4386 * From GLSL ES 3.00 section 4.5.4 ("Default Precision Qualifiers"):
4388 * "The precision statement
4390 * precision precision-qualifier type;
4392 * can be used to establish a default precision qualifier. The type field
4393 * can be either int or float or any of the sampler types, and the
4394 * precision-qualifier can be lowp, mediump, or highp."
4396 * GLSL ES 1.00 has similar language. GLSL 1.30 doesn't allow precision
4397 * qualifiers on sampler types, but this seems like an oversight (since the
4398 * intention of including these in GLSL 1.30 is to allow compatibility with ES
4399 * shaders). So we allow int, float, and all sampler types regardless of GLSL
4403 is_valid_default_precision_type(const struct glsl_type
*const type
)
4408 switch (type
->base_type
) {
4410 case GLSL_TYPE_FLOAT
:
4411 /* "int" and "float" are valid, but vectors and matrices are not. */
4412 return type
->vector_elements
== 1 && type
->matrix_columns
== 1;
4413 case GLSL_TYPE_SAMPLER
:
4422 ast_type_specifier::hir(exec_list
*instructions
,
4423 struct _mesa_glsl_parse_state
*state
)
4425 if (this->default_precision
== ast_precision_none
&& this->structure
== NULL
)
4428 YYLTYPE loc
= this->get_location();
4430 /* If this is a precision statement, check that the type to which it is
4431 * applied is either float or int.
4433 * From section 4.5.3 of the GLSL 1.30 spec:
4434 * "The precision statement
4435 * precision precision-qualifier type;
4436 * can be used to establish a default precision qualifier. The type
4437 * field can be either int or float [...]. Any other types or
4438 * qualifiers will result in an error.
4440 if (this->default_precision
!= ast_precision_none
) {
4441 if (!state
->check_precision_qualifiers_allowed(&loc
))
4444 if (this->structure
!= NULL
) {
4445 _mesa_glsl_error(&loc
, state
,
4446 "precision qualifiers do not apply to structures");
4450 if (this->is_array
) {
4451 _mesa_glsl_error(&loc
, state
,
4452 "default precision statements do not apply to "
4457 const struct glsl_type
*const type
=
4458 state
->symbols
->get_type(this->type_name
);
4459 if (!is_valid_default_precision_type(type
)) {
4460 _mesa_glsl_error(&loc
, state
,
4461 "default precision statements apply only to "
4462 "float, int, and sampler types");
4466 if (type
->base_type
== GLSL_TYPE_FLOAT
4468 && state
->target
== fragment_shader
) {
4469 /* Section 4.5.3 (Default Precision Qualifiers) of the GLSL ES 1.00
4472 * "The fragment language has no default precision qualifier for
4473 * floating point types."
4475 * As a result, we have to track whether or not default precision has
4476 * been specified for float in GLSL ES fragment shaders.
4478 * Earlier in that same section, the spec says:
4480 * "Non-precision qualified declarations will use the precision
4481 * qualifier specified in the most recent precision statement
4482 * that is still in scope. The precision statement has the same
4483 * scoping rules as variable declarations. If it is declared
4484 * inside a compound statement, its effect stops at the end of
4485 * the innermost statement it was declared in. Precision
4486 * statements in nested scopes override precision statements in
4487 * outer scopes. Multiple precision statements for the same basic
4488 * type can appear inside the same scope, with later statements
4489 * overriding earlier statements within that scope."
4491 * Default precision specifications follow the same scope rules as
4492 * variables. So, we can track the state of the default float
4493 * precision in the symbol table, and the rules will just work. This
4494 * is a slight abuse of the symbol table, but it has the semantics
4497 ir_variable
*const junk
=
4498 new(state
) ir_variable(type
, "#default precision",
4501 state
->symbols
->add_variable(junk
);
4504 /* FINISHME: Translate precision statements into IR. */
4508 /* _mesa_ast_set_aggregate_type() sets the <structure> field so that
4509 * process_record_constructor() can do type-checking on C-style initializer
4510 * expressions of structs, but ast_struct_specifier should only be translated
4511 * to HIR if it is declaring the type of a structure.
4513 * The ->is_declaration field is false for initializers of variables
4514 * declared separately from the struct's type definition.
4516 * struct S { ... }; (is_declaration = true)
4517 * struct T { ... } t = { ... }; (is_declaration = true)
4518 * S s = { ... }; (is_declaration = false)
4520 if (this->structure
!= NULL
&& this->structure
->is_declaration
)
4521 return this->structure
->hir(instructions
, state
);
4528 * Process a structure or interface block tree into an array of structure fields
4530 * After parsing, where there are some syntax differnces, structures and
4531 * interface blocks are almost identical. They are similar enough that the
4532 * AST for each can be processed the same way into a set of
4533 * \c glsl_struct_field to describe the members.
4535 * If we're processing an interface block, var_mode should be the type of the
4536 * interface block (ir_var_shader_in, ir_var_shader_out, or ir_var_uniform).
4537 * If we're processing a structure, var_mode should be ir_var_auto.
4540 * The number of fields processed. A pointer to the array structure fields is
4541 * stored in \c *fields_ret.
4544 ast_process_structure_or_interface_block(exec_list
*instructions
,
4545 struct _mesa_glsl_parse_state
*state
,
4546 exec_list
*declarations
,
4548 glsl_struct_field
**fields_ret
,
4550 bool block_row_major
,
4551 bool allow_reserved_names
,
4552 ir_variable_mode var_mode
)
4554 unsigned decl_count
= 0;
4556 /* Make an initial pass over the list of fields to determine how
4557 * many there are. Each element in this list is an ast_declarator_list.
4558 * This means that we actually need to count the number of elements in the
4559 * 'declarations' list in each of the elements.
4561 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
4562 foreach_list_const (decl_ptr
, & decl_list
->declarations
) {
4567 /* Allocate storage for the fields and process the field
4568 * declarations. As the declarations are processed, try to also convert
4569 * the types to HIR. This ensures that structure definitions embedded in
4570 * other structure definitions or in interface blocks are processed.
4572 glsl_struct_field
*const fields
= ralloc_array(state
, glsl_struct_field
,
4576 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
4577 const char *type_name
;
4579 decl_list
->type
->specifier
->hir(instructions
, state
);
4581 /* Section 10.9 of the GLSL ES 1.00 specification states that
4582 * embedded structure definitions have been removed from the language.
4584 if (state
->es_shader
&& decl_list
->type
->specifier
->structure
!= NULL
) {
4585 _mesa_glsl_error(&loc
, state
, "embedded structure definitions are "
4586 "not allowed in GLSL ES 1.00");
4589 const glsl_type
*decl_type
=
4590 decl_list
->type
->glsl_type(& type_name
, state
);
4592 foreach_list_typed (ast_declaration
, decl
, link
,
4593 &decl_list
->declarations
) {
4594 if (!allow_reserved_names
)
4595 validate_identifier(decl
->identifier
, loc
, state
);
4597 /* From the GL_ARB_uniform_buffer_object spec:
4599 * "Sampler types are not allowed inside of uniform
4600 * blocks. All other types, arrays, and structures
4601 * allowed for uniforms are allowed within a uniform
4604 * It should be impossible for decl_type to be NULL here. Cases that
4605 * might naturally lead to decl_type being NULL, especially for the
4606 * is_interface case, will have resulted in compilation having
4607 * already halted due to a syntax error.
4609 const struct glsl_type
*field_type
=
4610 decl_type
!= NULL
? decl_type
: glsl_type::error_type
;
4612 if (is_interface
&& field_type
->contains_sampler()) {
4613 YYLTYPE loc
= decl_list
->get_location();
4614 _mesa_glsl_error(&loc
, state
,
4615 "uniform in non-default uniform block contains sampler");
4618 if (field_type
->contains_atomic()) {
4619 /* FINISHME: Add a spec quotation here once updated spec
4620 * FINISHME: language is available. See Khronos bug #10903
4621 * FINISHME: on whether atomic counters are allowed in
4622 * FINISHME: structures.
4624 YYLTYPE loc
= decl_list
->get_location();
4625 _mesa_glsl_error(&loc
, state
, "atomic counter in structure or "
4629 const struct ast_type_qualifier
*const qual
=
4630 & decl_list
->type
->qualifier
;
4631 if (qual
->flags
.q
.std140
||
4632 qual
->flags
.q
.packed
||
4633 qual
->flags
.q
.shared
) {
4634 _mesa_glsl_error(&loc
, state
,
4635 "uniform block layout qualifiers std140, packed, and "
4636 "shared can only be applied to uniform blocks, not "
4640 if (decl
->is_array
) {
4641 field_type
= process_array_type(&loc
, decl_type
, decl
->array_size
,
4644 fields
[i
].type
= field_type
;
4645 fields
[i
].name
= decl
->identifier
;
4646 fields
[i
].location
= -1;
4647 fields
[i
].interpolation
=
4648 interpret_interpolation_qualifier(qual
, var_mode
, state
, &loc
);
4649 fields
[i
].centroid
= qual
->flags
.q
.centroid
? 1 : 0;
4651 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
4652 if (!qual
->flags
.q
.uniform
) {
4653 _mesa_glsl_error(&loc
, state
,
4654 "row_major and column_major can only be "
4655 "applied to uniform interface blocks");
4657 validate_matrix_layout_for_type(state
, &loc
, field_type
, NULL
);
4660 if (qual
->flags
.q
.uniform
&& qual
->has_interpolation()) {
4661 _mesa_glsl_error(&loc
, state
,
4662 "interpolation qualifiers cannot be used "
4663 "with uniform interface blocks");
4666 if (field_type
->is_matrix() ||
4667 (field_type
->is_array() && field_type
->fields
.array
->is_matrix())) {
4668 fields
[i
].row_major
= block_row_major
;
4669 if (qual
->flags
.q
.row_major
)
4670 fields
[i
].row_major
= true;
4671 else if (qual
->flags
.q
.column_major
)
4672 fields
[i
].row_major
= false;
4679 assert(i
== decl_count
);
4681 *fields_ret
= fields
;
4687 ast_struct_specifier::hir(exec_list
*instructions
,
4688 struct _mesa_glsl_parse_state
*state
)
4690 YYLTYPE loc
= this->get_location();
4692 /* Section 4.1.8 (Structures) of the GLSL 1.10 spec says:
4694 * "Anonymous structures are not supported; so embedded structures must
4695 * have a declarator. A name given to an embedded struct is scoped at
4696 * the same level as the struct it is embedded in."
4698 * The same section of the GLSL 1.20 spec says:
4700 * "Anonymous structures are not supported. Embedded structures are not
4703 * struct S { float f; };
4705 * S; // Error: anonymous structures disallowed
4706 * struct { ... }; // Error: embedded structures disallowed
4707 * S s; // Okay: nested structures with name are allowed
4710 * The GLSL ES 1.00 and 3.00 specs have similar langauge and examples. So,
4711 * we allow embedded structures in 1.10 only.
4713 if (state
->language_version
!= 110 && state
->struct_specifier_depth
!= 0)
4714 _mesa_glsl_error(&loc
, state
,
4715 "embedded structure declartions are not allowed");
4717 state
->struct_specifier_depth
++;
4719 glsl_struct_field
*fields
;
4720 unsigned decl_count
=
4721 ast_process_structure_or_interface_block(instructions
,
4723 &this->declarations
,
4728 false /* allow_reserved_names */,
4731 validate_identifier(this->name
, loc
, state
);
4733 const glsl_type
*t
=
4734 glsl_type::get_record_instance(fields
, decl_count
, this->name
);
4736 if (!state
->symbols
->add_type(name
, t
)) {
4737 _mesa_glsl_error(& loc
, state
, "struct `%s' previously defined", name
);
4739 const glsl_type
**s
= reralloc(state
, state
->user_structures
,
4741 state
->num_user_structures
+ 1);
4743 s
[state
->num_user_structures
] = t
;
4744 state
->user_structures
= s
;
4745 state
->num_user_structures
++;
4749 state
->struct_specifier_depth
--;
4751 /* Structure type definitions do not have r-values.
4758 * Visitor class which detects whether a given interface block has been used.
4760 class interface_block_usage_visitor
: public ir_hierarchical_visitor
4763 interface_block_usage_visitor(ir_variable_mode mode
, const glsl_type
*block
)
4764 : mode(mode
), block(block
), found(false)
4768 virtual ir_visitor_status
visit(ir_dereference_variable
*ir
)
4770 if (ir
->var
->mode
== mode
&& ir
->var
->get_interface_type() == block
) {
4774 return visit_continue
;
4777 bool usage_found() const
4783 ir_variable_mode mode
;
4784 const glsl_type
*block
;
4790 ast_interface_block::hir(exec_list
*instructions
,
4791 struct _mesa_glsl_parse_state
*state
)
4793 YYLTYPE loc
= this->get_location();
4795 /* The ast_interface_block has a list of ast_declarator_lists. We
4796 * need to turn those into ir_variables with an association
4797 * with this uniform block.
4799 enum glsl_interface_packing packing
;
4800 if (this->layout
.flags
.q
.shared
) {
4801 packing
= GLSL_INTERFACE_PACKING_SHARED
;
4802 } else if (this->layout
.flags
.q
.packed
) {
4803 packing
= GLSL_INTERFACE_PACKING_PACKED
;
4805 /* The default layout is std140.
4807 packing
= GLSL_INTERFACE_PACKING_STD140
;
4810 ir_variable_mode var_mode
;
4811 const char *iface_type_name
;
4812 if (this->layout
.flags
.q
.in
) {
4813 var_mode
= ir_var_shader_in
;
4814 iface_type_name
= "in";
4815 } else if (this->layout
.flags
.q
.out
) {
4816 var_mode
= ir_var_shader_out
;
4817 iface_type_name
= "out";
4818 } else if (this->layout
.flags
.q
.uniform
) {
4819 var_mode
= ir_var_uniform
;
4820 iface_type_name
= "uniform";
4822 var_mode
= ir_var_auto
;
4823 iface_type_name
= "UNKNOWN";
4824 assert(!"interface block layout qualifier not found!");
4827 bool redeclaring_per_vertex
= strcmp(this->block_name
, "gl_PerVertex") == 0;
4828 bool block_row_major
= this->layout
.flags
.q
.row_major
;
4829 exec_list declared_variables
;
4830 glsl_struct_field
*fields
;
4831 unsigned int num_variables
=
4832 ast_process_structure_or_interface_block(&declared_variables
,
4834 &this->declarations
,
4839 redeclaring_per_vertex
,
4842 if (!redeclaring_per_vertex
)
4843 validate_identifier(this->block_name
, loc
, state
);
4845 const glsl_type
*earlier_per_vertex
= NULL
;
4846 if (redeclaring_per_vertex
) {
4847 /* Find the previous declaration of gl_PerVertex. If we're redeclaring
4848 * the named interface block gl_in, we can find it by looking at the
4849 * previous declaration of gl_in. Otherwise we can find it by looking
4850 * at the previous decalartion of any of the built-in outputs,
4853 * Also check that the instance name and array-ness of the redeclaration
4857 case ir_var_shader_in
:
4858 if (ir_variable
*earlier_gl_in
=
4859 state
->symbols
->get_variable("gl_in")) {
4860 earlier_per_vertex
= earlier_gl_in
->get_interface_type();
4862 _mesa_glsl_error(&loc
, state
,
4863 "redeclaration of gl_PerVertex input not allowed "
4865 _mesa_glsl_shader_target_name(state
->target
));
4867 if (this->instance_name
== NULL
||
4868 strcmp(this->instance_name
, "gl_in") != 0 || !this->is_array
) {
4869 _mesa_glsl_error(&loc
, state
,
4870 "gl_PerVertex input must be redeclared as "
4874 case ir_var_shader_out
:
4875 if (ir_variable
*earlier_gl_Position
=
4876 state
->symbols
->get_variable("gl_Position")) {
4877 earlier_per_vertex
= earlier_gl_Position
->get_interface_type();
4879 _mesa_glsl_error(&loc
, state
,
4880 "redeclaration of gl_PerVertex output not "
4881 "allowed in the %s shader",
4882 _mesa_glsl_shader_target_name(state
->target
));
4884 if (this->instance_name
!= NULL
) {
4885 _mesa_glsl_error(&loc
, state
,
4886 "gl_PerVertex input may not be redeclared with "
4887 "an instance name");
4891 _mesa_glsl_error(&loc
, state
,
4892 "gl_PerVertex must be declared as an input or an "
4897 if (earlier_per_vertex
== NULL
) {
4898 /* An error has already been reported. Bail out to avoid null
4899 * dereferences later in this function.
4904 /* Copy locations from the old gl_PerVertex interface block. */
4905 for (unsigned i
= 0; i
< num_variables
; i
++) {
4906 int j
= earlier_per_vertex
->field_index(fields
[i
].name
);
4908 _mesa_glsl_error(&loc
, state
,
4909 "redeclaration of gl_PerVertex must be a subset "
4910 "of the built-in members of gl_PerVertex");
4912 fields
[i
].location
=
4913 earlier_per_vertex
->fields
.structure
[j
].location
;
4914 fields
[i
].interpolation
=
4915 earlier_per_vertex
->fields
.structure
[j
].interpolation
;
4916 fields
[i
].centroid
=
4917 earlier_per_vertex
->fields
.structure
[j
].centroid
;
4921 /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10
4924 * If a built-in interface block is redeclared, it must appear in
4925 * the shader before any use of any member included in the built-in
4926 * declaration, or a compilation error will result.
4928 * This appears to be a clarification to the behaviour established for
4929 * gl_PerVertex by GLSL 1.50, therefore we implement this behaviour
4930 * regardless of GLSL version.
4932 interface_block_usage_visitor
v(var_mode
, earlier_per_vertex
);
4933 v
.run(instructions
);
4934 if (v
.usage_found()) {
4935 _mesa_glsl_error(&loc
, state
,
4936 "redeclaration of a built-in interface block must "
4937 "appear before any use of any member of the "
4942 const glsl_type
*block_type
=
4943 glsl_type::get_interface_instance(fields
,
4948 if (!state
->symbols
->add_interface(block_type
->name
, block_type
, var_mode
)) {
4949 YYLTYPE loc
= this->get_location();
4950 _mesa_glsl_error(&loc
, state
, "interface block `%s' with type `%s' "
4951 "already taken in the current scope",
4952 this->block_name
, iface_type_name
);
4955 /* Since interface blocks cannot contain statements, it should be
4956 * impossible for the block to generate any instructions.
4958 assert(declared_variables
.is_empty());
4960 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
4962 * Geometry shader input variables get the per-vertex values written
4963 * out by vertex shader output variables of the same names. Since a
4964 * geometry shader operates on a set of vertices, each input varying
4965 * variable (or input block, see interface blocks below) needs to be
4966 * declared as an array.
4968 if (state
->target
== geometry_shader
&& !this->is_array
&&
4969 var_mode
== ir_var_shader_in
) {
4970 _mesa_glsl_error(&loc
, state
, "geometry shader inputs must be arrays");
4973 /* Page 39 (page 45 of the PDF) of section 4.3.7 in the GLSL ES 3.00 spec
4976 * "If an instance name (instance-name) is used, then it puts all the
4977 * members inside a scope within its own name space, accessed with the
4978 * field selector ( . ) operator (analogously to structures)."
4980 if (this->instance_name
) {
4981 if (redeclaring_per_vertex
) {
4982 /* When a built-in in an unnamed interface block is redeclared,
4983 * get_variable_being_redeclared() calls
4984 * check_builtin_array_max_size() to make sure that built-in array
4985 * variables aren't redeclared to illegal sizes. But we're looking
4986 * at a redeclaration of a named built-in interface block. So we
4987 * have to manually call check_builtin_array_max_size() for all parts
4988 * of the interface that are arrays.
4990 for (unsigned i
= 0; i
< num_variables
; i
++) {
4991 if (fields
[i
].type
->is_array()) {
4992 const unsigned size
= fields
[i
].type
->array_size();
4993 check_builtin_array_max_size(fields
[i
].name
, size
, loc
, state
);
4997 validate_identifier(this->instance_name
, loc
, state
);
5002 if (this->is_array
) {
5003 /* Section 4.3.7 (Interface Blocks) of the GLSL 1.50 spec says:
5005 * For uniform blocks declared an array, each individual array
5006 * element corresponds to a separate buffer object backing one
5007 * instance of the block. As the array size indicates the number
5008 * of buffer objects needed, uniform block array declarations
5009 * must specify an array size.
5011 * And a few paragraphs later:
5013 * Geometry shader input blocks must be declared as arrays and
5014 * follow the array declaration and linking rules for all
5015 * geometry shader inputs. All other input and output block
5016 * arrays must specify an array size.
5018 * The upshot of this is that the only circumstance where an
5019 * interface array size *doesn't* need to be specified is on a
5020 * geometry shader input.
5022 if (this->array_size
== NULL
&&
5023 (state
->target
!= geometry_shader
|| !this->layout
.flags
.q
.in
)) {
5024 _mesa_glsl_error(&loc
, state
,
5025 "only geometry shader inputs may be unsized "
5026 "instance block arrays");
5030 const glsl_type
*block_array_type
=
5031 process_array_type(&loc
, block_type
, this->array_size
, state
);
5033 var
= new(state
) ir_variable(block_array_type
,
5034 this->instance_name
,
5037 var
= new(state
) ir_variable(block_type
,
5038 this->instance_name
,
5042 if (state
->target
== geometry_shader
&& var_mode
== ir_var_shader_in
)
5043 handle_geometry_shader_input_decl(state
, loc
, var
);
5045 if (ir_variable
*earlier
=
5046 state
->symbols
->get_variable(this->instance_name
)) {
5047 if (!redeclaring_per_vertex
) {
5048 _mesa_glsl_error(&loc
, state
, "`%s' redeclared",
5049 this->instance_name
);
5051 earlier
->type
= var
->type
;
5052 earlier
->reinit_interface_type(block_type
);
5055 state
->symbols
->add_variable(var
);
5056 instructions
->push_tail(var
);
5059 /* In order to have an array size, the block must also be declared with
5062 assert(!this->is_array
);
5064 for (unsigned i
= 0; i
< num_variables
; i
++) {
5066 new(state
) ir_variable(fields
[i
].type
,
5067 ralloc_strdup(state
, fields
[i
].name
),
5069 var
->interpolation
= fields
[i
].interpolation
;
5070 var
->centroid
= fields
[i
].centroid
;
5071 var
->init_interface_type(block_type
);
5073 if (redeclaring_per_vertex
) {
5074 ir_variable
*earlier
=
5075 get_variable_being_redeclared(var
, loc
, state
,
5076 true /* allow_all_redeclarations */);
5077 if (strncmp(var
->name
, "gl_", 3) != 0 || earlier
== NULL
) {
5078 _mesa_glsl_error(&loc
, state
,
5079 "redeclaration of gl_PerVertex can only "
5080 "include built-in variables");
5082 earlier
->reinit_interface_type(block_type
);
5087 if (state
->symbols
->get_variable(var
->name
) != NULL
)
5088 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", var
->name
);
5090 /* Propagate the "binding" keyword into this UBO's fields;
5091 * the UBO declaration itself doesn't get an ir_variable unless it
5092 * has an instance name. This is ugly.
5094 var
->explicit_binding
= this->layout
.flags
.q
.explicit_binding
;
5095 var
->binding
= this->layout
.binding
;
5097 state
->symbols
->add_variable(var
);
5098 instructions
->push_tail(var
);
5101 if (redeclaring_per_vertex
&& block_type
!= earlier_per_vertex
) {
5102 /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10 spec:
5104 * It is also a compilation error ... to redeclare a built-in
5105 * block and then use a member from that built-in block that was
5106 * not included in the redeclaration.
5108 * This appears to be a clarification to the behaviour established
5109 * for gl_PerVertex by GLSL 1.50, therefore we implement this
5110 * behaviour regardless of GLSL version.
5112 * To prevent the shader from using a member that was not included in
5113 * the redeclaration, we disable any ir_variables that are still
5114 * associated with the old declaration of gl_PerVertex (since we've
5115 * already updated all of the variables contained in the new
5116 * gl_PerVertex to point to it).
5118 * As a side effect this will prevent
5119 * validate_intrastage_interface_blocks() from getting confused and
5120 * thinking there are conflicting definitions of gl_PerVertex in the
5123 foreach_list_safe(node
, instructions
) {
5124 ir_variable
*const var
= ((ir_instruction
*) node
)->as_variable();
5126 var
->get_interface_type() == earlier_per_vertex
&&
5127 var
->mode
== var_mode
) {
5128 state
->symbols
->disable_variable(var
->name
);
5140 ast_gs_input_layout::hir(exec_list
*instructions
,
5141 struct _mesa_glsl_parse_state
*state
)
5143 YYLTYPE loc
= this->get_location();
5145 /* If any geometry input layout declaration preceded this one, make sure it
5146 * was consistent with this one.
5148 if (state
->gs_input_prim_type_specified
&&
5149 state
->gs_input_prim_type
!= this->prim_type
) {
5150 _mesa_glsl_error(&loc
, state
,
5151 "geometry shader input layout does not match"
5152 " previous declaration");
5156 /* If any shader inputs occurred before this declaration and specified an
5157 * array size, make sure the size they specified is consistent with the
5160 unsigned num_vertices
= vertices_per_prim(this->prim_type
);
5161 if (state
->gs_input_size
!= 0 && state
->gs_input_size
!= num_vertices
) {
5162 _mesa_glsl_error(&loc
, state
,
5163 "this geometry shader input layout implies %u vertices"
5164 " per primitive, but a previous input is declared"
5165 " with size %u", num_vertices
, state
->gs_input_size
);
5169 state
->gs_input_prim_type_specified
= true;
5170 state
->gs_input_prim_type
= this->prim_type
;
5172 /* If any shader inputs occurred before this declaration and did not
5173 * specify an array size, their size is determined now.
5175 foreach_list (node
, instructions
) {
5176 ir_variable
*var
= ((ir_instruction
*) node
)->as_variable();
5177 if (var
== NULL
|| var
->mode
!= ir_var_shader_in
)
5180 /* Note: gl_PrimitiveIDIn has mode ir_var_shader_in, but it's not an
5184 if (var
->type
->is_unsized_array()) {
5185 if (var
->max_array_access
>= num_vertices
) {
5186 _mesa_glsl_error(&loc
, state
,
5187 "this geometry shader input layout implies %u"
5188 " vertices, but an access to element %u of input"
5189 " `%s' already exists", num_vertices
,
5190 var
->max_array_access
, var
->name
);
5192 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
5203 detect_conflicting_assignments(struct _mesa_glsl_parse_state
*state
,
5204 exec_list
*instructions
)
5206 bool gl_FragColor_assigned
= false;
5207 bool gl_FragData_assigned
= false;
5208 bool user_defined_fs_output_assigned
= false;
5209 ir_variable
*user_defined_fs_output
= NULL
;
5211 /* It would be nice to have proper location information. */
5213 memset(&loc
, 0, sizeof(loc
));
5215 foreach_list(node
, instructions
) {
5216 ir_variable
*var
= ((ir_instruction
*)node
)->as_variable();
5218 if (!var
|| !var
->assigned
)
5221 if (strcmp(var
->name
, "gl_FragColor") == 0)
5222 gl_FragColor_assigned
= true;
5223 else if (strcmp(var
->name
, "gl_FragData") == 0)
5224 gl_FragData_assigned
= true;
5225 else if (strncmp(var
->name
, "gl_", 3) != 0) {
5226 if (state
->target
== fragment_shader
&&
5227 var
->mode
== ir_var_shader_out
) {
5228 user_defined_fs_output_assigned
= true;
5229 user_defined_fs_output
= var
;
5234 /* From the GLSL 1.30 spec:
5236 * "If a shader statically assigns a value to gl_FragColor, it
5237 * may not assign a value to any element of gl_FragData. If a
5238 * shader statically writes a value to any element of
5239 * gl_FragData, it may not assign a value to
5240 * gl_FragColor. That is, a shader may assign values to either
5241 * gl_FragColor or gl_FragData, but not both. Multiple shaders
5242 * linked together must also consistently write just one of
5243 * these variables. Similarly, if user declared output
5244 * variables are in use (statically assigned to), then the
5245 * built-in variables gl_FragColor and gl_FragData may not be
5246 * assigned to. These incorrect usages all generate compile
5249 if (gl_FragColor_assigned
&& gl_FragData_assigned
) {
5250 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
5251 "`gl_FragColor' and `gl_FragData'");
5252 } else if (gl_FragColor_assigned
&& user_defined_fs_output_assigned
) {
5253 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
5254 "`gl_FragColor' and `%s'",
5255 user_defined_fs_output
->name
);
5256 } else if (gl_FragData_assigned
&& user_defined_fs_output_assigned
) {
5257 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
5258 "`gl_FragData' and `%s'",
5259 user_defined_fs_output
->name
);
5265 remove_per_vertex_blocks(exec_list
*instructions
,
5266 _mesa_glsl_parse_state
*state
, ir_variable_mode mode
)
5268 /* Find the gl_PerVertex interface block of the appropriate (in/out) mode,
5269 * if it exists in this shader type.
5271 const glsl_type
*per_vertex
= NULL
;
5273 case ir_var_shader_in
:
5274 if (ir_variable
*gl_in
= state
->symbols
->get_variable("gl_in"))
5275 per_vertex
= gl_in
->get_interface_type();
5277 case ir_var_shader_out
:
5278 if (ir_variable
*gl_Position
=
5279 state
->symbols
->get_variable("gl_Position")) {
5280 per_vertex
= gl_Position
->get_interface_type();
5284 assert(!"Unexpected mode");
5288 /* If we didn't find a built-in gl_PerVertex interface block, then we don't
5289 * need to do anything.
5291 if (per_vertex
== NULL
)
5294 /* If the interface block is used by the shader, then we don't need to do
5297 interface_block_usage_visitor
v(mode
, per_vertex
);
5298 v
.run(instructions
);
5299 if (v
.usage_found())
5302 /* Remove any ir_variable declarations that refer to the interface block
5305 foreach_list_safe(node
, instructions
) {
5306 ir_variable
*const var
= ((ir_instruction
*) node
)->as_variable();
5307 if (var
!= NULL
&& var
->get_interface_type() == per_vertex
&&
5308 var
->mode
== mode
) {
5309 state
->symbols
->disable_variable(var
->name
);