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 (lhs_type
->is_unsized_array() && rhs
->type
->is_array()
700 && (lhs_type
->element_type() == rhs
->type
->element_type())) {
701 if (is_initializer
) {
704 _mesa_glsl_error(&loc
, state
,
705 "implicitly sized arrays cannot be assigned");
710 /* Check for implicit conversion in GLSL 1.20 */
711 if (apply_implicit_conversion(lhs_type
, rhs
, state
)) {
712 if (rhs
->type
== lhs_type
)
716 _mesa_glsl_error(&loc
, state
,
717 "%s of type %s cannot be assigned to "
718 "variable of type %s",
719 is_initializer
? "initializer" : "value",
720 rhs
->type
->name
, lhs_type
->name
);
726 mark_whole_array_access(ir_rvalue
*access
)
728 ir_dereference_variable
*deref
= access
->as_dereference_variable();
730 if (deref
&& deref
->var
) {
731 deref
->var
->data
.max_array_access
= deref
->type
->length
- 1;
736 do_assignment(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
,
737 const char *non_lvalue_description
,
738 ir_rvalue
*lhs
, ir_rvalue
*rhs
, bool is_initializer
,
742 bool error_emitted
= (lhs
->type
->is_error() || rhs
->type
->is_error());
744 /* If the assignment LHS comes back as an ir_binop_vector_extract
745 * expression, move it to the RHS as an ir_triop_vector_insert.
747 if (lhs
->ir_type
== ir_type_expression
) {
748 ir_expression
*const expr
= lhs
->as_expression();
750 if (unlikely(expr
->operation
== ir_binop_vector_extract
)) {
752 validate_assignment(state
, lhs_loc
, lhs
->type
,
753 rhs
, is_initializer
);
755 if (new_rhs
== NULL
) {
758 rhs
= new(ctx
) ir_expression(ir_triop_vector_insert
,
759 expr
->operands
[0]->type
,
763 lhs
= expr
->operands
[0]->clone(ctx
, NULL
);
768 ir_variable
*lhs_var
= lhs
->variable_referenced();
770 lhs_var
->data
.assigned
= true;
772 if (!error_emitted
) {
773 if (non_lvalue_description
!= NULL
) {
774 _mesa_glsl_error(&lhs_loc
, state
,
776 non_lvalue_description
);
777 error_emitted
= true;
778 } else if (lhs
->variable_referenced() != NULL
779 && lhs
->variable_referenced()->data
.read_only
) {
780 _mesa_glsl_error(&lhs_loc
, state
,
781 "assignment to read-only variable '%s'",
782 lhs
->variable_referenced()->name
);
783 error_emitted
= true;
785 } else if (lhs
->type
->is_array() &&
786 !state
->check_version(120, 300, &lhs_loc
,
787 "whole array assignment forbidden")) {
788 /* From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
790 * "Other binary or unary expressions, non-dereferenced
791 * arrays, function names, swizzles with repeated fields,
792 * and constants cannot be l-values."
794 * The restriction on arrays is lifted in GLSL 1.20 and GLSL ES 3.00.
796 error_emitted
= true;
797 } else if (!lhs
->is_lvalue()) {
798 _mesa_glsl_error(& lhs_loc
, state
, "non-lvalue in assignment");
799 error_emitted
= true;
804 validate_assignment(state
, lhs_loc
, lhs
->type
, rhs
, is_initializer
);
805 if (new_rhs
!= NULL
) {
808 /* If the LHS array was not declared with a size, it takes it size from
809 * the RHS. If the LHS is an l-value and a whole array, it must be a
810 * dereference of a variable. Any other case would require that the LHS
811 * is either not an l-value or not a whole array.
813 if (lhs
->type
->is_unsized_array()) {
814 ir_dereference
*const d
= lhs
->as_dereference();
818 ir_variable
*const var
= d
->variable_referenced();
822 if (var
->data
.max_array_access
>= unsigned(rhs
->type
->array_size())) {
823 /* FINISHME: This should actually log the location of the RHS. */
824 _mesa_glsl_error(& lhs_loc
, state
, "array size must be > %u due to "
826 var
->data
.max_array_access
);
829 var
->type
= glsl_type::get_array_instance(lhs
->type
->element_type(),
830 rhs
->type
->array_size());
833 mark_whole_array_access(rhs
);
834 mark_whole_array_access(lhs
);
837 /* Most callers of do_assignment (assign, add_assign, pre_inc/dec,
838 * but not post_inc) need the converted assigned value as an rvalue
839 * to handle things like:
843 * So we always just store the computed value being assigned to a
844 * temporary and return a deref of that temporary. If the rvalue
845 * ends up not being used, the temp will get copy-propagated out.
847 ir_variable
*var
= new(ctx
) ir_variable(rhs
->type
, "assignment_tmp",
849 ir_dereference_variable
*deref_var
= new(ctx
) ir_dereference_variable(var
);
850 instructions
->push_tail(var
);
851 instructions
->push_tail(new(ctx
) ir_assignment(deref_var
, rhs
));
852 deref_var
= new(ctx
) ir_dereference_variable(var
);
855 instructions
->push_tail(new(ctx
) ir_assignment(lhs
, deref_var
));
857 return new(ctx
) ir_dereference_variable(var
);
861 get_lvalue_copy(exec_list
*instructions
, ir_rvalue
*lvalue
)
863 void *ctx
= ralloc_parent(lvalue
);
866 var
= new(ctx
) ir_variable(lvalue
->type
, "_post_incdec_tmp",
868 instructions
->push_tail(var
);
869 var
->data
.mode
= ir_var_auto
;
871 instructions
->push_tail(new(ctx
) ir_assignment(new(ctx
) ir_dereference_variable(var
),
874 return new(ctx
) ir_dereference_variable(var
);
879 ast_node::hir(exec_list
*instructions
,
880 struct _mesa_glsl_parse_state
*state
)
889 do_comparison(void *mem_ctx
, int operation
, ir_rvalue
*op0
, ir_rvalue
*op1
)
892 ir_rvalue
*cmp
= NULL
;
894 if (operation
== ir_binop_all_equal
)
895 join_op
= ir_binop_logic_and
;
897 join_op
= ir_binop_logic_or
;
899 switch (op0
->type
->base_type
) {
900 case GLSL_TYPE_FLOAT
:
904 return new(mem_ctx
) ir_expression(operation
, op0
, op1
);
906 case GLSL_TYPE_ARRAY
: {
907 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
908 ir_rvalue
*e0
, *e1
, *result
;
910 e0
= new(mem_ctx
) ir_dereference_array(op0
->clone(mem_ctx
, NULL
),
911 new(mem_ctx
) ir_constant(i
));
912 e1
= new(mem_ctx
) ir_dereference_array(op1
->clone(mem_ctx
, NULL
),
913 new(mem_ctx
) ir_constant(i
));
914 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
917 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
923 mark_whole_array_access(op0
);
924 mark_whole_array_access(op1
);
928 case GLSL_TYPE_STRUCT
: {
929 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
930 ir_rvalue
*e0
, *e1
, *result
;
931 const char *field_name
= op0
->type
->fields
.structure
[i
].name
;
933 e0
= new(mem_ctx
) ir_dereference_record(op0
->clone(mem_ctx
, NULL
),
935 e1
= new(mem_ctx
) ir_dereference_record(op1
->clone(mem_ctx
, NULL
),
937 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
940 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
948 case GLSL_TYPE_ERROR
:
950 case GLSL_TYPE_SAMPLER
:
951 case GLSL_TYPE_INTERFACE
:
952 case GLSL_TYPE_ATOMIC_UINT
:
953 /* I assume a comparison of a struct containing a sampler just
954 * ignores the sampler present in the type.
960 cmp
= new(mem_ctx
) ir_constant(true);
965 /* For logical operations, we want to ensure that the operands are
966 * scalar booleans. If it isn't, emit an error and return a constant
967 * boolean to avoid triggering cascading error messages.
970 get_scalar_boolean_operand(exec_list
*instructions
,
971 struct _mesa_glsl_parse_state
*state
,
972 ast_expression
*parent_expr
,
974 const char *operand_name
,
977 ast_expression
*expr
= parent_expr
->subexpressions
[operand
];
979 ir_rvalue
*val
= expr
->hir(instructions
, state
);
981 if (val
->type
->is_boolean() && val
->type
->is_scalar())
984 if (!*error_emitted
) {
985 YYLTYPE loc
= expr
->get_location();
986 _mesa_glsl_error(&loc
, state
, "%s of `%s' must be scalar boolean",
988 parent_expr
->operator_string(parent_expr
->oper
));
989 *error_emitted
= true;
992 return new(ctx
) ir_constant(true);
996 * If name refers to a builtin array whose maximum allowed size is less than
997 * size, report an error and return true. Otherwise return false.
1000 check_builtin_array_max_size(const char *name
, unsigned size
,
1001 YYLTYPE loc
, struct _mesa_glsl_parse_state
*state
)
1003 if ((strcmp("gl_TexCoord", name
) == 0)
1004 && (size
> state
->Const
.MaxTextureCoords
)) {
1005 /* From page 54 (page 60 of the PDF) of the GLSL 1.20 spec:
1007 * "The size [of gl_TexCoord] can be at most
1008 * gl_MaxTextureCoords."
1010 _mesa_glsl_error(&loc
, state
, "`gl_TexCoord' array size cannot "
1011 "be larger than gl_MaxTextureCoords (%u)",
1012 state
->Const
.MaxTextureCoords
);
1013 } else if (strcmp("gl_ClipDistance", name
) == 0
1014 && size
> state
->Const
.MaxClipPlanes
) {
1015 /* From section 7.1 (Vertex Shader Special Variables) of the
1018 * "The gl_ClipDistance array is predeclared as unsized and
1019 * must be sized by the shader either redeclaring it with a
1020 * size or indexing it only with integral constant
1021 * expressions. ... The size can be at most
1022 * gl_MaxClipDistances."
1024 _mesa_glsl_error(&loc
, state
, "`gl_ClipDistance' array size cannot "
1025 "be larger than gl_MaxClipDistances (%u)",
1026 state
->Const
.MaxClipPlanes
);
1031 * Create the constant 1, of a which is appropriate for incrementing and
1032 * decrementing values of the given GLSL type. For example, if type is vec4,
1033 * this creates a constant value of 1.0 having type float.
1035 * If the given type is invalid for increment and decrement operators, return
1036 * a floating point 1--the error will be detected later.
1039 constant_one_for_inc_dec(void *ctx
, const glsl_type
*type
)
1041 switch (type
->base_type
) {
1042 case GLSL_TYPE_UINT
:
1043 return new(ctx
) ir_constant((unsigned) 1);
1045 return new(ctx
) ir_constant(1);
1047 case GLSL_TYPE_FLOAT
:
1048 return new(ctx
) ir_constant(1.0f
);
1053 ast_expression::hir(exec_list
*instructions
,
1054 struct _mesa_glsl_parse_state
*state
)
1057 static const int operations
[AST_NUM_OPERATORS
] = {
1058 -1, /* ast_assign doesn't convert to ir_expression. */
1059 -1, /* ast_plus doesn't convert to ir_expression. */
1073 ir_binop_any_nequal
,
1083 /* Note: The following block of expression types actually convert
1084 * to multiple IR instructions.
1086 ir_binop_mul
, /* ast_mul_assign */
1087 ir_binop_div
, /* ast_div_assign */
1088 ir_binop_mod
, /* ast_mod_assign */
1089 ir_binop_add
, /* ast_add_assign */
1090 ir_binop_sub
, /* ast_sub_assign */
1091 ir_binop_lshift
, /* ast_ls_assign */
1092 ir_binop_rshift
, /* ast_rs_assign */
1093 ir_binop_bit_and
, /* ast_and_assign */
1094 ir_binop_bit_xor
, /* ast_xor_assign */
1095 ir_binop_bit_or
, /* ast_or_assign */
1097 -1, /* ast_conditional doesn't convert to ir_expression. */
1098 ir_binop_add
, /* ast_pre_inc. */
1099 ir_binop_sub
, /* ast_pre_dec. */
1100 ir_binop_add
, /* ast_post_inc. */
1101 ir_binop_sub
, /* ast_post_dec. */
1102 -1, /* ast_field_selection doesn't conv to ir_expression. */
1103 -1, /* ast_array_index doesn't convert to ir_expression. */
1104 -1, /* ast_function_call doesn't conv to ir_expression. */
1105 -1, /* ast_identifier doesn't convert to ir_expression. */
1106 -1, /* ast_int_constant doesn't convert to ir_expression. */
1107 -1, /* ast_uint_constant doesn't conv to ir_expression. */
1108 -1, /* ast_float_constant doesn't conv to ir_expression. */
1109 -1, /* ast_bool_constant doesn't conv to ir_expression. */
1110 -1, /* ast_sequence doesn't convert to ir_expression. */
1112 ir_rvalue
*result
= NULL
;
1114 const struct glsl_type
*type
; /* a temporary variable for switch cases */
1115 bool error_emitted
= false;
1118 loc
= this->get_location();
1120 switch (this->oper
) {
1122 assert(!"ast_aggregate: Should never get here.");
1126 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1127 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1129 result
= do_assignment(instructions
, state
,
1130 this->subexpressions
[0]->non_lvalue_description
,
1131 op
[0], op
[1], false,
1132 this->subexpressions
[0]->get_location());
1133 error_emitted
= result
->type
->is_error();
1138 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1140 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1142 error_emitted
= type
->is_error();
1148 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1150 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1152 error_emitted
= type
->is_error();
1154 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1162 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1163 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1165 type
= arithmetic_result_type(op
[0], op
[1],
1166 (this->oper
== ast_mul
),
1168 error_emitted
= type
->is_error();
1170 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1175 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1176 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1178 type
= modulus_result_type(op
[0]->type
, op
[1]->type
, state
, & loc
);
1180 assert(operations
[this->oper
] == ir_binop_mod
);
1182 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1184 error_emitted
= type
->is_error();
1189 if (!state
->check_bitwise_operations_allowed(&loc
)) {
1190 error_emitted
= true;
1193 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1194 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1195 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1197 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1199 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1206 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1207 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1209 type
= relational_result_type(op
[0], op
[1], state
, & loc
);
1211 /* The relational operators must either generate an error or result
1212 * in a scalar boolean. See page 57 of the GLSL 1.50 spec.
1214 assert(type
->is_error()
1215 || ((type
->base_type
== GLSL_TYPE_BOOL
)
1216 && type
->is_scalar()));
1218 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1220 error_emitted
= type
->is_error();
1225 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1226 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1228 /* From page 58 (page 64 of the PDF) of the GLSL 1.50 spec:
1230 * "The equality operators equal (==), and not equal (!=)
1231 * operate on all types. They result in a scalar Boolean. If
1232 * the operand types do not match, then there must be a
1233 * conversion from Section 4.1.10 "Implicit Conversions"
1234 * applied to one operand that can make them match, in which
1235 * case this conversion is done."
1237 if ((!apply_implicit_conversion(op
[0]->type
, op
[1], state
)
1238 && !apply_implicit_conversion(op
[1]->type
, op
[0], state
))
1239 || (op
[0]->type
!= op
[1]->type
)) {
1240 _mesa_glsl_error(& loc
, state
, "operands of `%s' must have the same "
1241 "type", (this->oper
== ast_equal
) ? "==" : "!=");
1242 error_emitted
= true;
1243 } else if ((op
[0]->type
->is_array() || op
[1]->type
->is_array()) &&
1244 !state
->check_version(120, 300, &loc
,
1245 "array comparisons forbidden")) {
1246 error_emitted
= true;
1247 } else if ((op
[0]->type
->contains_opaque() ||
1248 op
[1]->type
->contains_opaque())) {
1249 _mesa_glsl_error(&loc
, state
, "opaque type comparisons forbidden");
1250 error_emitted
= true;
1253 if (error_emitted
) {
1254 result
= new(ctx
) ir_constant(false);
1256 result
= do_comparison(ctx
, operations
[this->oper
], op
[0], op
[1]);
1257 assert(result
->type
== glsl_type::bool_type
);
1264 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1265 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1266 type
= bit_logic_result_type(op
[0]->type
, op
[1]->type
, this->oper
,
1268 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1270 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1274 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1276 if (!state
->check_bitwise_operations_allowed(&loc
)) {
1277 error_emitted
= true;
1280 if (!op
[0]->type
->is_integer()) {
1281 _mesa_glsl_error(&loc
, state
, "operand of `~' must be an integer");
1282 error_emitted
= true;
1285 type
= error_emitted
? glsl_type::error_type
: op
[0]->type
;
1286 result
= new(ctx
) ir_expression(ir_unop_bit_not
, type
, op
[0], NULL
);
1289 case ast_logic_and
: {
1290 exec_list rhs_instructions
;
1291 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1292 "LHS", &error_emitted
);
1293 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1294 "RHS", &error_emitted
);
1296 if (rhs_instructions
.is_empty()) {
1297 result
= new(ctx
) ir_expression(ir_binop_logic_and
, op
[0], op
[1]);
1298 type
= result
->type
;
1300 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1303 instructions
->push_tail(tmp
);
1305 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1306 instructions
->push_tail(stmt
);
1308 stmt
->then_instructions
.append_list(&rhs_instructions
);
1309 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1310 ir_assignment
*const then_assign
=
1311 new(ctx
) ir_assignment(then_deref
, op
[1]);
1312 stmt
->then_instructions
.push_tail(then_assign
);
1314 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1315 ir_assignment
*const else_assign
=
1316 new(ctx
) ir_assignment(else_deref
, new(ctx
) ir_constant(false));
1317 stmt
->else_instructions
.push_tail(else_assign
);
1319 result
= new(ctx
) ir_dereference_variable(tmp
);
1325 case ast_logic_or
: {
1326 exec_list rhs_instructions
;
1327 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1328 "LHS", &error_emitted
);
1329 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1330 "RHS", &error_emitted
);
1332 if (rhs_instructions
.is_empty()) {
1333 result
= new(ctx
) ir_expression(ir_binop_logic_or
, op
[0], op
[1]);
1334 type
= result
->type
;
1336 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1339 instructions
->push_tail(tmp
);
1341 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1342 instructions
->push_tail(stmt
);
1344 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1345 ir_assignment
*const then_assign
=
1346 new(ctx
) ir_assignment(then_deref
, new(ctx
) ir_constant(true));
1347 stmt
->then_instructions
.push_tail(then_assign
);
1349 stmt
->else_instructions
.append_list(&rhs_instructions
);
1350 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1351 ir_assignment
*const else_assign
=
1352 new(ctx
) ir_assignment(else_deref
, op
[1]);
1353 stmt
->else_instructions
.push_tail(else_assign
);
1355 result
= new(ctx
) ir_dereference_variable(tmp
);
1362 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1364 * "The logical binary operators and (&&), or ( | | ), and
1365 * exclusive or (^^). They operate only on two Boolean
1366 * expressions and result in a Boolean expression."
1368 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0, "LHS",
1370 op
[1] = get_scalar_boolean_operand(instructions
, state
, this, 1, "RHS",
1373 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1378 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1379 "operand", &error_emitted
);
1381 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1385 case ast_mul_assign
:
1386 case ast_div_assign
:
1387 case ast_add_assign
:
1388 case ast_sub_assign
: {
1389 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1390 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1392 type
= arithmetic_result_type(op
[0], op
[1],
1393 (this->oper
== ast_mul_assign
),
1396 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1399 result
= do_assignment(instructions
, state
,
1400 this->subexpressions
[0]->non_lvalue_description
,
1401 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1402 this->subexpressions
[0]->get_location());
1403 error_emitted
= (op
[0]->type
->is_error());
1405 /* GLSL 1.10 does not allow array assignment. However, we don't have to
1406 * explicitly test for this because none of the binary expression
1407 * operators allow array operands either.
1413 case ast_mod_assign
: {
1414 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1415 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1417 type
= modulus_result_type(op
[0]->type
, op
[1]->type
, state
, & loc
);
1419 assert(operations
[this->oper
] == ir_binop_mod
);
1421 ir_rvalue
*temp_rhs
;
1422 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1425 result
= do_assignment(instructions
, state
,
1426 this->subexpressions
[0]->non_lvalue_description
,
1427 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1428 this->subexpressions
[0]->get_location());
1429 error_emitted
= type
->is_error();
1434 case ast_rs_assign
: {
1435 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1436 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1437 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1439 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1440 type
, op
[0], op
[1]);
1441 result
= do_assignment(instructions
, state
,
1442 this->subexpressions
[0]->non_lvalue_description
,
1443 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1444 this->subexpressions
[0]->get_location());
1445 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1449 case ast_and_assign
:
1450 case ast_xor_assign
:
1451 case ast_or_assign
: {
1452 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1453 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1454 type
= bit_logic_result_type(op
[0]->type
, op
[1]->type
, this->oper
,
1456 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1457 type
, op
[0], op
[1]);
1458 result
= do_assignment(instructions
, state
,
1459 this->subexpressions
[0]->non_lvalue_description
,
1460 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1461 this->subexpressions
[0]->get_location());
1462 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1466 case ast_conditional
: {
1467 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1469 * "The ternary selection operator (?:). It operates on three
1470 * expressions (exp1 ? exp2 : exp3). This operator evaluates the
1471 * first expression, which must result in a scalar Boolean."
1473 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1474 "condition", &error_emitted
);
1476 /* The :? operator is implemented by generating an anonymous temporary
1477 * followed by an if-statement. The last instruction in each branch of
1478 * the if-statement assigns a value to the anonymous temporary. This
1479 * temporary is the r-value of the expression.
1481 exec_list then_instructions
;
1482 exec_list else_instructions
;
1484 op
[1] = this->subexpressions
[1]->hir(&then_instructions
, state
);
1485 op
[2] = this->subexpressions
[2]->hir(&else_instructions
, state
);
1487 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1489 * "The second and third expressions can be any type, as
1490 * long their types match, or there is a conversion in
1491 * Section 4.1.10 "Implicit Conversions" that can be applied
1492 * to one of the expressions to make their types match. This
1493 * resulting matching type is the type of the entire
1496 if ((!apply_implicit_conversion(op
[1]->type
, op
[2], state
)
1497 && !apply_implicit_conversion(op
[2]->type
, op
[1], state
))
1498 || (op
[1]->type
!= op
[2]->type
)) {
1499 YYLTYPE loc
= this->subexpressions
[1]->get_location();
1501 _mesa_glsl_error(& loc
, state
, "second and third operands of ?: "
1502 "operator must have matching types");
1503 error_emitted
= true;
1504 type
= glsl_type::error_type
;
1509 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1511 * "The second and third expressions must be the same type, but can
1512 * be of any type other than an array."
1514 if (type
->is_array() &&
1515 !state
->check_version(120, 300, &loc
,
1516 "second and third operands of ?: operator "
1517 "cannot be arrays")) {
1518 error_emitted
= true;
1521 ir_constant
*cond_val
= op
[0]->constant_expression_value();
1522 ir_constant
*then_val
= op
[1]->constant_expression_value();
1523 ir_constant
*else_val
= op
[2]->constant_expression_value();
1525 if (then_instructions
.is_empty()
1526 && else_instructions
.is_empty()
1527 && (cond_val
!= NULL
) && (then_val
!= NULL
) && (else_val
!= NULL
)) {
1528 result
= (cond_val
->value
.b
[0]) ? then_val
: else_val
;
1530 ir_variable
*const tmp
=
1531 new(ctx
) ir_variable(type
, "conditional_tmp", ir_var_temporary
);
1532 instructions
->push_tail(tmp
);
1534 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1535 instructions
->push_tail(stmt
);
1537 then_instructions
.move_nodes_to(& stmt
->then_instructions
);
1538 ir_dereference
*const then_deref
=
1539 new(ctx
) ir_dereference_variable(tmp
);
1540 ir_assignment
*const then_assign
=
1541 new(ctx
) ir_assignment(then_deref
, op
[1]);
1542 stmt
->then_instructions
.push_tail(then_assign
);
1544 else_instructions
.move_nodes_to(& stmt
->else_instructions
);
1545 ir_dereference
*const else_deref
=
1546 new(ctx
) ir_dereference_variable(tmp
);
1547 ir_assignment
*const else_assign
=
1548 new(ctx
) ir_assignment(else_deref
, op
[2]);
1549 stmt
->else_instructions
.push_tail(else_assign
);
1551 result
= new(ctx
) ir_dereference_variable(tmp
);
1558 this->non_lvalue_description
= (this->oper
== ast_pre_inc
)
1559 ? "pre-increment operation" : "pre-decrement operation";
1561 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1562 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1564 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1566 ir_rvalue
*temp_rhs
;
1567 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1570 result
= do_assignment(instructions
, state
,
1571 this->subexpressions
[0]->non_lvalue_description
,
1572 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1573 this->subexpressions
[0]->get_location());
1574 error_emitted
= op
[0]->type
->is_error();
1579 case ast_post_dec
: {
1580 this->non_lvalue_description
= (this->oper
== ast_post_inc
)
1581 ? "post-increment operation" : "post-decrement operation";
1582 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1583 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1585 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1587 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1589 ir_rvalue
*temp_rhs
;
1590 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1593 /* Get a temporary of a copy of the lvalue before it's modified.
1594 * This may get thrown away later.
1596 result
= get_lvalue_copy(instructions
, op
[0]->clone(ctx
, NULL
));
1598 (void)do_assignment(instructions
, state
,
1599 this->subexpressions
[0]->non_lvalue_description
,
1600 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1601 this->subexpressions
[0]->get_location());
1603 error_emitted
= op
[0]->type
->is_error();
1607 case ast_field_selection
:
1608 result
= _mesa_ast_field_selection_to_hir(this, instructions
, state
);
1611 case ast_array_index
: {
1612 YYLTYPE index_loc
= subexpressions
[1]->get_location();
1614 op
[0] = subexpressions
[0]->hir(instructions
, state
);
1615 op
[1] = subexpressions
[1]->hir(instructions
, state
);
1617 result
= _mesa_ast_array_index_to_hir(ctx
, state
, op
[0], op
[1],
1620 if (result
->type
->is_error())
1621 error_emitted
= true;
1626 case ast_function_call
:
1627 /* Should *NEVER* get here. ast_function_call should always be handled
1628 * by ast_function_expression::hir.
1633 case ast_identifier
: {
1634 /* ast_identifier can appear several places in a full abstract syntax
1635 * tree. This particular use must be at location specified in the grammar
1636 * as 'variable_identifier'.
1639 state
->symbols
->get_variable(this->primary_expression
.identifier
);
1642 var
->data
.used
= true;
1643 result
= new(ctx
) ir_dereference_variable(var
);
1645 _mesa_glsl_error(& loc
, state
, "`%s' undeclared",
1646 this->primary_expression
.identifier
);
1648 result
= ir_rvalue::error_value(ctx
);
1649 error_emitted
= true;
1654 case ast_int_constant
:
1655 result
= new(ctx
) ir_constant(this->primary_expression
.int_constant
);
1658 case ast_uint_constant
:
1659 result
= new(ctx
) ir_constant(this->primary_expression
.uint_constant
);
1662 case ast_float_constant
:
1663 result
= new(ctx
) ir_constant(this->primary_expression
.float_constant
);
1666 case ast_bool_constant
:
1667 result
= new(ctx
) ir_constant(bool(this->primary_expression
.bool_constant
));
1670 case ast_sequence
: {
1671 /* It should not be possible to generate a sequence in the AST without
1672 * any expressions in it.
1674 assert(!this->expressions
.is_empty());
1676 /* The r-value of a sequence is the last expression in the sequence. If
1677 * the other expressions in the sequence do not have side-effects (and
1678 * therefore add instructions to the instruction list), they get dropped
1681 exec_node
*previous_tail_pred
= NULL
;
1682 YYLTYPE previous_operand_loc
= loc
;
1684 foreach_list_typed (ast_node
, ast
, link
, &this->expressions
) {
1685 /* If one of the operands of comma operator does not generate any
1686 * code, we want to emit a warning. At each pass through the loop
1687 * previous_tail_pred will point to the last instruction in the
1688 * stream *before* processing the previous operand. Naturally,
1689 * instructions->tail_pred will point to the last instruction in the
1690 * stream *after* processing the previous operand. If the two
1691 * pointers match, then the previous operand had no effect.
1693 * The warning behavior here differs slightly from GCC. GCC will
1694 * only emit a warning if none of the left-hand operands have an
1695 * effect. However, it will emit a warning for each. I believe that
1696 * there are some cases in C (especially with GCC extensions) where
1697 * it is useful to have an intermediate step in a sequence have no
1698 * effect, but I don't think these cases exist in GLSL. Either way,
1699 * it would be a giant hassle to replicate that behavior.
1701 if (previous_tail_pred
== instructions
->tail_pred
) {
1702 _mesa_glsl_warning(&previous_operand_loc
, state
,
1703 "left-hand operand of comma expression has "
1707 /* tail_pred is directly accessed instead of using the get_tail()
1708 * method for performance reasons. get_tail() has extra code to
1709 * return NULL when the list is empty. We don't care about that
1710 * here, so using tail_pred directly is fine.
1712 previous_tail_pred
= instructions
->tail_pred
;
1713 previous_operand_loc
= ast
->get_location();
1715 result
= ast
->hir(instructions
, state
);
1718 /* Any errors should have already been emitted in the loop above.
1720 error_emitted
= true;
1724 type
= NULL
; /* use result->type, not type. */
1725 assert(result
!= NULL
);
1727 if (result
->type
->is_error() && !error_emitted
)
1728 _mesa_glsl_error(& loc
, state
, "type mismatch");
1735 ast_expression_statement::hir(exec_list
*instructions
,
1736 struct _mesa_glsl_parse_state
*state
)
1738 /* It is possible to have expression statements that don't have an
1739 * expression. This is the solitary semicolon:
1741 * for (i = 0; i < 5; i++)
1744 * In this case the expression will be NULL. Test for NULL and don't do
1745 * anything in that case.
1747 if (expression
!= NULL
)
1748 expression
->hir(instructions
, state
);
1750 /* Statements do not have r-values.
1757 ast_compound_statement::hir(exec_list
*instructions
,
1758 struct _mesa_glsl_parse_state
*state
)
1761 state
->symbols
->push_scope();
1763 foreach_list_typed (ast_node
, ast
, link
, &this->statements
)
1764 ast
->hir(instructions
, state
);
1767 state
->symbols
->pop_scope();
1769 /* Compound statements do not have r-values.
1775 static const glsl_type
*
1776 process_array_type(YYLTYPE
*loc
, const glsl_type
*base
, ast_node
*array_size
,
1777 struct _mesa_glsl_parse_state
*state
)
1779 unsigned length
= 0;
1782 return glsl_type::error_type
;
1784 /* From page 19 (page 25) of the GLSL 1.20 spec:
1786 * "Only one-dimensional arrays may be declared."
1788 if (base
->is_array()) {
1789 _mesa_glsl_error(loc
, state
,
1790 "invalid array of `%s' (only one-dimensional arrays "
1793 return glsl_type::error_type
;
1796 if (array_size
!= NULL
) {
1797 exec_list dummy_instructions
;
1798 ir_rvalue
*const ir
= array_size
->hir(& dummy_instructions
, state
);
1799 YYLTYPE loc
= array_size
->get_location();
1802 if (!ir
->type
->is_integer()) {
1803 _mesa_glsl_error(& loc
, state
, "array size must be integer type");
1804 } else if (!ir
->type
->is_scalar()) {
1805 _mesa_glsl_error(& loc
, state
, "array size must be scalar type");
1807 ir_constant
*const size
= ir
->constant_expression_value();
1810 _mesa_glsl_error(& loc
, state
, "array size must be a "
1811 "constant valued expression");
1812 } else if (size
->value
.i
[0] <= 0) {
1813 _mesa_glsl_error(& loc
, state
, "array size must be > 0");
1815 assert(size
->type
== ir
->type
);
1816 length
= size
->value
.u
[0];
1818 /* If the array size is const (and we've verified that
1819 * it is) then no instructions should have been emitted
1820 * when we converted it to HIR. If they were emitted,
1821 * then either the array size isn't const after all, or
1822 * we are emitting unnecessary instructions.
1824 assert(dummy_instructions
.is_empty());
1830 const glsl_type
*array_type
= glsl_type::get_array_instance(base
, length
);
1831 return array_type
!= NULL
? array_type
: glsl_type::error_type
;
1836 ast_type_specifier::glsl_type(const char **name
,
1837 struct _mesa_glsl_parse_state
*state
) const
1839 const struct glsl_type
*type
;
1841 type
= state
->symbols
->get_type(this->type_name
);
1842 *name
= this->type_name
;
1844 if (this->is_array
) {
1845 YYLTYPE loc
= this->get_location();
1846 type
= process_array_type(&loc
, type
, this->array_size
, state
);
1853 ast_fully_specified_type::glsl_type(const char **name
,
1854 struct _mesa_glsl_parse_state
*state
) const
1856 const struct glsl_type
*type
= this->specifier
->glsl_type(name
, state
);
1861 if (type
->base_type
== GLSL_TYPE_FLOAT
1863 && state
->stage
== MESA_SHADER_FRAGMENT
1864 && this->qualifier
.precision
== ast_precision_none
1865 && state
->symbols
->get_variable("#default precision") == NULL
) {
1866 YYLTYPE loc
= this->get_location();
1867 _mesa_glsl_error(&loc
, state
,
1868 "no precision specified this scope for type `%s'",
1876 * Determine whether a toplevel variable declaration declares a varying. This
1877 * function operates by examining the variable's mode and the shader target,
1878 * so it correctly identifies linkage variables regardless of whether they are
1879 * declared using the deprecated "varying" syntax or the new "in/out" syntax.
1881 * Passing a non-toplevel variable declaration (e.g. a function parameter) to
1882 * this function will produce undefined results.
1885 is_varying_var(ir_variable
*var
, gl_shader_stage target
)
1888 case MESA_SHADER_VERTEX
:
1889 return var
->data
.mode
== ir_var_shader_out
;
1890 case MESA_SHADER_FRAGMENT
:
1891 return var
->data
.mode
== ir_var_shader_in
;
1893 return var
->data
.mode
== ir_var_shader_out
|| var
->data
.mode
== ir_var_shader_in
;
1899 * Matrix layout qualifiers are only allowed on certain types
1902 validate_matrix_layout_for_type(struct _mesa_glsl_parse_state
*state
,
1904 const glsl_type
*type
,
1907 if (var
&& !var
->is_in_uniform_block()) {
1908 /* Layout qualifiers may only apply to interface blocks and fields in
1911 _mesa_glsl_error(loc
, state
,
1912 "uniform block layout qualifiers row_major and "
1913 "column_major may not be applied to variables "
1914 "outside of uniform blocks");
1915 } else if (!type
->is_matrix()) {
1916 /* The OpenGL ES 3.0 conformance tests did not originally allow
1917 * matrix layout qualifiers on non-matrices. However, the OpenGL
1918 * 4.4 and OpenGL ES 3.0 (revision TBD) specifications were
1919 * amended to specifically allow these layouts on all types. Emit
1920 * a warning so that people know their code may not be portable.
1922 _mesa_glsl_warning(loc
, state
,
1923 "uniform block layout qualifiers row_major and "
1924 "column_major applied to non-matrix types may "
1925 "be rejected by older compilers");
1926 } else if (type
->is_record()) {
1927 /* We allow 'layout(row_major)' on structure types because it's the only
1928 * way to get row-major layouts on matrices contained in structures.
1930 _mesa_glsl_warning(loc
, state
,
1931 "uniform block layout qualifiers row_major and "
1932 "column_major applied to structure types is not "
1933 "strictly conformant and may be rejected by other "
1939 validate_binding_qualifier(struct _mesa_glsl_parse_state
*state
,
1942 const ast_type_qualifier
*qual
)
1944 if (var
->data
.mode
!= ir_var_uniform
) {
1945 _mesa_glsl_error(loc
, state
,
1946 "the \"binding\" qualifier only applies to uniforms");
1950 if (qual
->binding
< 0) {
1951 _mesa_glsl_error(loc
, state
, "binding values must be >= 0");
1955 const struct gl_context
*const ctx
= state
->ctx
;
1956 unsigned elements
= var
->type
->is_array() ? var
->type
->length
: 1;
1957 unsigned max_index
= qual
->binding
+ elements
- 1;
1959 if (var
->type
->is_interface()) {
1960 /* UBOs. From page 60 of the GLSL 4.20 specification:
1961 * "If the binding point for any uniform block instance is less than zero,
1962 * or greater than or equal to the implementation-dependent maximum
1963 * number of uniform buffer bindings, a compilation error will occur.
1964 * When the binding identifier is used with a uniform block instanced as
1965 * an array of size N, all elements of the array from binding through
1966 * binding + N – 1 must be within this range."
1968 * The implementation-dependent maximum is GL_MAX_UNIFORM_BUFFER_BINDINGS.
1970 if (max_index
>= ctx
->Const
.MaxUniformBufferBindings
) {
1971 _mesa_glsl_error(loc
, state
, "layout(binding = %d) for %d UBOs exceeds "
1972 "the maximum number of UBO binding points (%d)",
1973 qual
->binding
, elements
,
1974 ctx
->Const
.MaxUniformBufferBindings
);
1977 } else if (var
->type
->is_sampler() ||
1978 (var
->type
->is_array() && var
->type
->fields
.array
->is_sampler())) {
1979 /* Samplers. From page 63 of the GLSL 4.20 specification:
1980 * "If the binding is less than zero, or greater than or equal to the
1981 * implementation-dependent maximum supported number of units, a
1982 * compilation error will occur. When the binding identifier is used
1983 * with an array of size N, all elements of the array from binding
1984 * through binding + N - 1 must be within this range."
1986 unsigned limit
= ctx
->Const
.Program
[state
->stage
].MaxTextureImageUnits
;
1988 if (max_index
>= limit
) {
1989 _mesa_glsl_error(loc
, state
, "layout(binding = %d) for %d samplers "
1990 "exceeds the maximum number of texture image units "
1991 "(%d)", qual
->binding
, elements
, limit
);
1995 } else if (var
->type
->contains_atomic()) {
1996 assert(ctx
->Const
.MaxAtomicBufferBindings
<= MAX_COMBINED_ATOMIC_BUFFERS
);
1997 if (unsigned(qual
->binding
) >= ctx
->Const
.MaxAtomicBufferBindings
) {
1998 _mesa_glsl_error(loc
, state
, "layout(binding = %d) exceeds the "
1999 " maximum number of atomic counter buffer bindings"
2000 "(%d)", qual
->binding
,
2001 ctx
->Const
.MaxAtomicBufferBindings
);
2006 _mesa_glsl_error(loc
, state
,
2007 "the \"binding\" qualifier only applies to uniform "
2008 "blocks, samplers, atomic counters, or arrays thereof");
2016 static glsl_interp_qualifier
2017 interpret_interpolation_qualifier(const struct ast_type_qualifier
*qual
,
2018 ir_variable_mode mode
,
2019 struct _mesa_glsl_parse_state
*state
,
2022 glsl_interp_qualifier interpolation
;
2023 if (qual
->flags
.q
.flat
)
2024 interpolation
= INTERP_QUALIFIER_FLAT
;
2025 else if (qual
->flags
.q
.noperspective
)
2026 interpolation
= INTERP_QUALIFIER_NOPERSPECTIVE
;
2027 else if (qual
->flags
.q
.smooth
)
2028 interpolation
= INTERP_QUALIFIER_SMOOTH
;
2030 interpolation
= INTERP_QUALIFIER_NONE
;
2032 if (interpolation
!= INTERP_QUALIFIER_NONE
) {
2033 if (mode
!= ir_var_shader_in
&& mode
!= ir_var_shader_out
) {
2034 _mesa_glsl_error(loc
, state
,
2035 "interpolation qualifier `%s' can only be applied to "
2036 "shader inputs or outputs.",
2037 interpolation_string(interpolation
));
2041 if ((state
->stage
== MESA_SHADER_VERTEX
&& mode
== ir_var_shader_in
) ||
2042 (state
->stage
== MESA_SHADER_FRAGMENT
&& mode
== ir_var_shader_out
)) {
2043 _mesa_glsl_error(loc
, state
,
2044 "interpolation qualifier `%s' cannot be applied to "
2045 "vertex shader inputs or fragment shader outputs",
2046 interpolation_string(interpolation
));
2050 return interpolation
;
2055 validate_explicit_location(const struct ast_type_qualifier
*qual
,
2057 struct _mesa_glsl_parse_state
*state
,
2062 /* In the vertex shader only shader inputs can be given explicit
2065 * In the fragment shader only shader outputs can be given explicit
2068 switch (state
->stage
) {
2069 case MESA_SHADER_VERTEX
:
2070 if (var
->data
.mode
== ir_var_shader_in
) {
2071 if (!state
->check_explicit_attrib_location_allowed(loc
, var
))
2080 case MESA_SHADER_GEOMETRY
:
2081 _mesa_glsl_error(loc
, state
,
2082 "geometry shader variables cannot be given "
2083 "explicit locations");
2086 case MESA_SHADER_FRAGMENT
:
2087 if (var
->data
.mode
== ir_var_shader_out
) {
2088 if (!state
->check_explicit_attrib_location_allowed(loc
, var
))
2099 _mesa_glsl_error(loc
, state
,
2100 "%s cannot be given an explicit location in %s shader",
2102 _mesa_shader_stage_to_string(state
->stage
));
2104 var
->data
.explicit_location
= true;
2106 /* This bit of silliness is needed because invalid explicit locations
2107 * are supposed to be flagged during linking. Small negative values
2108 * biased by VERT_ATTRIB_GENERIC0 or FRAG_RESULT_DATA0 could alias
2109 * built-in values (e.g., -16+VERT_ATTRIB_GENERIC0 = VERT_ATTRIB_POS).
2110 * The linker needs to be able to differentiate these cases. This
2111 * ensures that negative values stay negative.
2113 if (qual
->location
>= 0) {
2114 var
->data
.location
= (state
->stage
== MESA_SHADER_VERTEX
)
2115 ? (qual
->location
+ VERT_ATTRIB_GENERIC0
)
2116 : (qual
->location
+ FRAG_RESULT_DATA0
);
2118 var
->data
.location
= qual
->location
;
2121 if (qual
->flags
.q
.explicit_index
) {
2122 /* From the GLSL 4.30 specification, section 4.4.2 (Output
2123 * Layout Qualifiers):
2125 * "It is also a compile-time error if a fragment shader
2126 * sets a layout index to less than 0 or greater than 1."
2128 * Older specifications don't mandate a behavior; we take
2129 * this as a clarification and always generate the error.
2131 if (qual
->index
< 0 || qual
->index
> 1) {
2132 _mesa_glsl_error(loc
, state
,
2133 "explicit index may only be 0 or 1");
2135 var
->data
.explicit_index
= true;
2136 var
->data
.index
= qual
->index
;
2145 apply_type_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
2147 struct _mesa_glsl_parse_state
*state
,
2151 STATIC_ASSERT(sizeof(qual
->flags
.q
) <= sizeof(qual
->flags
.i
));
2153 if (qual
->flags
.q
.invariant
) {
2154 if (var
->data
.used
) {
2155 _mesa_glsl_error(loc
, state
,
2156 "variable `%s' may not be redeclared "
2157 "`invariant' after being used",
2160 var
->data
.invariant
= 1;
2164 if (qual
->flags
.q
.constant
|| qual
->flags
.q
.attribute
2165 || qual
->flags
.q
.uniform
2166 || (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_FRAGMENT
)))
2167 var
->data
.read_only
= 1;
2169 if (qual
->flags
.q
.centroid
)
2170 var
->data
.centroid
= 1;
2172 if (qual
->flags
.q
.sample
)
2173 var
->data
.sample
= 1;
2175 if (qual
->flags
.q
.attribute
&& state
->stage
!= MESA_SHADER_VERTEX
) {
2176 var
->type
= glsl_type::error_type
;
2177 _mesa_glsl_error(loc
, state
,
2178 "`attribute' variables may not be declared in the "
2180 _mesa_shader_stage_to_string(state
->stage
));
2183 /* Section 6.1.1 (Function Calling Conventions) of the GLSL 1.10 spec says:
2185 * "However, the const qualifier cannot be used with out or inout."
2187 * The same section of the GLSL 4.40 spec further clarifies this saying:
2189 * "The const qualifier cannot be used with out or inout, or a
2190 * compile-time error results."
2192 if (is_parameter
&& qual
->flags
.q
.constant
&& qual
->flags
.q
.out
) {
2193 _mesa_glsl_error(loc
, state
,
2194 "`const' may not be applied to `out' or `inout' "
2195 "function parameters");
2198 /* If there is no qualifier that changes the mode of the variable, leave
2199 * the setting alone.
2201 if (qual
->flags
.q
.in
&& qual
->flags
.q
.out
)
2202 var
->data
.mode
= ir_var_function_inout
;
2203 else if (qual
->flags
.q
.in
)
2204 var
->data
.mode
= is_parameter
? ir_var_function_in
: ir_var_shader_in
;
2205 else if (qual
->flags
.q
.attribute
2206 || (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_FRAGMENT
)))
2207 var
->data
.mode
= ir_var_shader_in
;
2208 else if (qual
->flags
.q
.out
)
2209 var
->data
.mode
= is_parameter
? ir_var_function_out
: ir_var_shader_out
;
2210 else if (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_VERTEX
))
2211 var
->data
.mode
= ir_var_shader_out
;
2212 else if (qual
->flags
.q
.uniform
)
2213 var
->data
.mode
= ir_var_uniform
;
2215 if (!is_parameter
&& is_varying_var(var
, state
->stage
)) {
2216 /* This variable is being used to link data between shader stages (in
2217 * pre-glsl-1.30 parlance, it's a "varying"). Check that it has a type
2218 * that is allowed for such purposes.
2220 * From page 25 (page 31 of the PDF) of the GLSL 1.10 spec:
2222 * "The varying qualifier can be used only with the data types
2223 * float, vec2, vec3, vec4, mat2, mat3, and mat4, or arrays of
2226 * This was relaxed in GLSL version 1.30 and GLSL ES version 3.00. From
2227 * page 31 (page 37 of the PDF) of the GLSL 1.30 spec:
2229 * "Fragment inputs can only be signed and unsigned integers and
2230 * integer vectors, float, floating-point vectors, matrices, or
2231 * arrays of these. Structures cannot be input.
2233 * Similar text exists in the section on vertex shader outputs.
2235 * Similar text exists in the GLSL ES 3.00 spec, except that the GLSL ES
2236 * 3.00 spec allows structs as well. Varying structs are also allowed
2239 switch (var
->type
->get_scalar_type()->base_type
) {
2240 case GLSL_TYPE_FLOAT
:
2241 /* Ok in all GLSL versions */
2243 case GLSL_TYPE_UINT
:
2245 if (state
->is_version(130, 300))
2247 _mesa_glsl_error(loc
, state
,
2248 "varying variables must be of base type float in %s",
2249 state
->get_version_string());
2251 case GLSL_TYPE_STRUCT
:
2252 if (state
->is_version(150, 300))
2254 _mesa_glsl_error(loc
, state
,
2255 "varying variables may not be of type struct");
2258 _mesa_glsl_error(loc
, state
, "illegal type for a varying variable");
2263 if (state
->all_invariant
&& (state
->current_function
== NULL
)) {
2264 switch (state
->stage
) {
2265 case MESA_SHADER_VERTEX
:
2266 if (var
->data
.mode
== ir_var_shader_out
)
2267 var
->data
.invariant
= true;
2269 case MESA_SHADER_GEOMETRY
:
2270 if ((var
->data
.mode
== ir_var_shader_in
)
2271 || (var
->data
.mode
== ir_var_shader_out
))
2272 var
->data
.invariant
= true;
2274 case MESA_SHADER_FRAGMENT
:
2275 if (var
->data
.mode
== ir_var_shader_in
)
2276 var
->data
.invariant
= true;
2281 var
->data
.interpolation
=
2282 interpret_interpolation_qualifier(qual
, (ir_variable_mode
) var
->data
.mode
,
2285 var
->data
.pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
2286 var
->data
.origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
2287 if ((qual
->flags
.q
.origin_upper_left
|| qual
->flags
.q
.pixel_center_integer
)
2288 && (strcmp(var
->name
, "gl_FragCoord") != 0)) {
2289 const char *const qual_string
= (qual
->flags
.q
.origin_upper_left
)
2290 ? "origin_upper_left" : "pixel_center_integer";
2292 _mesa_glsl_error(loc
, state
,
2293 "layout qualifier `%s' can only be applied to "
2294 "fragment shader input `gl_FragCoord'",
2298 if (qual
->flags
.q
.explicit_location
) {
2299 validate_explicit_location(qual
, var
, state
, loc
);
2300 } else if (qual
->flags
.q
.explicit_index
) {
2301 _mesa_glsl_error(loc
, state
,
2302 "explicit index requires explicit location");
2305 if (qual
->flags
.q
.explicit_binding
&&
2306 validate_binding_qualifier(state
, loc
, var
, qual
)) {
2307 var
->data
.explicit_binding
= true;
2308 var
->data
.binding
= qual
->binding
;
2311 if (var
->type
->contains_atomic()) {
2312 if (var
->data
.mode
== ir_var_uniform
) {
2313 if (var
->data
.explicit_binding
) {
2315 &state
->atomic_counter_offsets
[var
->data
.binding
];
2317 if (*offset
% ATOMIC_COUNTER_SIZE
)
2318 _mesa_glsl_error(loc
, state
,
2319 "misaligned atomic counter offset");
2321 var
->data
.atomic
.offset
= *offset
;
2322 *offset
+= var
->type
->atomic_size();
2325 _mesa_glsl_error(loc
, state
,
2326 "atomic counters require explicit binding point");
2328 } else if (var
->data
.mode
!= ir_var_function_in
) {
2329 _mesa_glsl_error(loc
, state
, "atomic counters may only be declared as "
2330 "function parameters or uniform-qualified "
2331 "global variables");
2335 /* Does the declaration use the deprecated 'attribute' or 'varying'
2338 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
2339 || qual
->flags
.q
.varying
;
2341 /* Is the 'layout' keyword used with parameters that allow relaxed checking.
2342 * Many implementations of GL_ARB_fragment_coord_conventions_enable and some
2343 * implementations (only Mesa?) GL_ARB_explicit_attrib_location_enable
2344 * allowed the layout qualifier to be used with 'varying' and 'attribute'.
2345 * These extensions and all following extensions that add the 'layout'
2346 * keyword have been modified to require the use of 'in' or 'out'.
2348 * The following extension do not allow the deprecated keywords:
2350 * GL_AMD_conservative_depth
2351 * GL_ARB_conservative_depth
2352 * GL_ARB_gpu_shader5
2353 * GL_ARB_separate_shader_objects
2354 * GL_ARB_tesselation_shader
2355 * GL_ARB_transform_feedback3
2356 * GL_ARB_uniform_buffer_object
2358 * It is unknown whether GL_EXT_shader_image_load_store or GL_NV_gpu_shader5
2359 * allow layout with the deprecated keywords.
2361 const bool relaxed_layout_qualifier_checking
=
2362 state
->ARB_fragment_coord_conventions_enable
;
2364 if (qual
->has_layout() && uses_deprecated_qualifier
) {
2365 if (relaxed_layout_qualifier_checking
) {
2366 _mesa_glsl_warning(loc
, state
,
2367 "`layout' qualifier may not be used with "
2368 "`attribute' or `varying'");
2370 _mesa_glsl_error(loc
, state
,
2371 "`layout' qualifier may not be used with "
2372 "`attribute' or `varying'");
2376 /* Layout qualifiers for gl_FragDepth, which are enabled by extension
2377 * AMD_conservative_depth.
2379 int depth_layout_count
= qual
->flags
.q
.depth_any
2380 + qual
->flags
.q
.depth_greater
2381 + qual
->flags
.q
.depth_less
2382 + qual
->flags
.q
.depth_unchanged
;
2383 if (depth_layout_count
> 0
2384 && !state
->AMD_conservative_depth_enable
2385 && !state
->ARB_conservative_depth_enable
) {
2386 _mesa_glsl_error(loc
, state
,
2387 "extension GL_AMD_conservative_depth or "
2388 "GL_ARB_conservative_depth must be enabled "
2389 "to use depth layout qualifiers");
2390 } else if (depth_layout_count
> 0
2391 && strcmp(var
->name
, "gl_FragDepth") != 0) {
2392 _mesa_glsl_error(loc
, state
,
2393 "depth layout qualifiers can be applied only to "
2395 } else if (depth_layout_count
> 1
2396 && strcmp(var
->name
, "gl_FragDepth") == 0) {
2397 _mesa_glsl_error(loc
, state
,
2398 "at most one depth layout qualifier can be applied to "
2401 if (qual
->flags
.q
.depth_any
)
2402 var
->data
.depth_layout
= ir_depth_layout_any
;
2403 else if (qual
->flags
.q
.depth_greater
)
2404 var
->data
.depth_layout
= ir_depth_layout_greater
;
2405 else if (qual
->flags
.q
.depth_less
)
2406 var
->data
.depth_layout
= ir_depth_layout_less
;
2407 else if (qual
->flags
.q
.depth_unchanged
)
2408 var
->data
.depth_layout
= ir_depth_layout_unchanged
;
2410 var
->data
.depth_layout
= ir_depth_layout_none
;
2412 if (qual
->flags
.q
.std140
||
2413 qual
->flags
.q
.packed
||
2414 qual
->flags
.q
.shared
) {
2415 _mesa_glsl_error(loc
, state
,
2416 "uniform block layout qualifiers std140, packed, and "
2417 "shared can only be applied to uniform blocks, not "
2421 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
2422 validate_matrix_layout_for_type(state
, loc
, var
->type
, var
);
2427 * Get the variable that is being redeclared by this declaration
2429 * Semantic checks to verify the validity of the redeclaration are also
2430 * performed. If semantic checks fail, compilation error will be emitted via
2431 * \c _mesa_glsl_error, but a non-\c NULL pointer will still be returned.
2434 * A pointer to an existing variable in the current scope if the declaration
2435 * is a redeclaration, \c NULL otherwise.
2437 static ir_variable
*
2438 get_variable_being_redeclared(ir_variable
*var
, YYLTYPE loc
,
2439 struct _mesa_glsl_parse_state
*state
,
2440 bool allow_all_redeclarations
)
2442 /* Check if this declaration is actually a re-declaration, either to
2443 * resize an array or add qualifiers to an existing variable.
2445 * This is allowed for variables in the current scope, or when at
2446 * global scope (for built-ins in the implicit outer scope).
2448 ir_variable
*earlier
= state
->symbols
->get_variable(var
->name
);
2449 if (earlier
== NULL
||
2450 (state
->current_function
!= NULL
&&
2451 !state
->symbols
->name_declared_this_scope(var
->name
))) {
2456 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec,
2458 * "It is legal to declare an array without a size and then
2459 * later re-declare the same name as an array of the same
2460 * type and specify a size."
2462 if (earlier
->type
->is_unsized_array() && var
->type
->is_array()
2463 && (var
->type
->element_type() == earlier
->type
->element_type())) {
2464 /* FINISHME: This doesn't match the qualifiers on the two
2465 * FINISHME: declarations. It's not 100% clear whether this is
2466 * FINISHME: required or not.
2469 const unsigned size
= unsigned(var
->type
->array_size());
2470 check_builtin_array_max_size(var
->name
, size
, loc
, state
);
2471 if ((size
> 0) && (size
<= earlier
->data
.max_array_access
)) {
2472 _mesa_glsl_error(& loc
, state
, "array size must be > %u due to "
2474 earlier
->data
.max_array_access
);
2477 earlier
->type
= var
->type
;
2480 } else if ((state
->ARB_fragment_coord_conventions_enable
||
2481 state
->is_version(150, 0))
2482 && strcmp(var
->name
, "gl_FragCoord") == 0
2483 && earlier
->type
== var
->type
2484 && earlier
->data
.mode
== var
->data
.mode
) {
2485 /* Allow redeclaration of gl_FragCoord for ARB_fcc layout
2488 earlier
->data
.origin_upper_left
= var
->data
.origin_upper_left
;
2489 earlier
->data
.pixel_center_integer
= var
->data
.pixel_center_integer
;
2491 /* According to section 4.3.7 of the GLSL 1.30 spec,
2492 * the following built-in varaibles can be redeclared with an
2493 * interpolation qualifier:
2496 * * gl_FrontSecondaryColor
2497 * * gl_BackSecondaryColor
2499 * * gl_SecondaryColor
2501 } else if (state
->is_version(130, 0)
2502 && (strcmp(var
->name
, "gl_FrontColor") == 0
2503 || strcmp(var
->name
, "gl_BackColor") == 0
2504 || strcmp(var
->name
, "gl_FrontSecondaryColor") == 0
2505 || strcmp(var
->name
, "gl_BackSecondaryColor") == 0
2506 || strcmp(var
->name
, "gl_Color") == 0
2507 || strcmp(var
->name
, "gl_SecondaryColor") == 0)
2508 && earlier
->type
== var
->type
2509 && earlier
->data
.mode
== var
->data
.mode
) {
2510 earlier
->data
.interpolation
= var
->data
.interpolation
;
2512 /* Layout qualifiers for gl_FragDepth. */
2513 } else if ((state
->AMD_conservative_depth_enable
||
2514 state
->ARB_conservative_depth_enable
)
2515 && strcmp(var
->name
, "gl_FragDepth") == 0
2516 && earlier
->type
== var
->type
2517 && earlier
->data
.mode
== var
->data
.mode
) {
2519 /** From the AMD_conservative_depth spec:
2520 * Within any shader, the first redeclarations of gl_FragDepth
2521 * must appear before any use of gl_FragDepth.
2523 if (earlier
->data
.used
) {
2524 _mesa_glsl_error(&loc
, state
,
2525 "the first redeclaration of gl_FragDepth "
2526 "must appear before any use of gl_FragDepth");
2529 /* Prevent inconsistent redeclaration of depth layout qualifier. */
2530 if (earlier
->data
.depth_layout
!= ir_depth_layout_none
2531 && earlier
->data
.depth_layout
!= var
->data
.depth_layout
) {
2532 _mesa_glsl_error(&loc
, state
,
2533 "gl_FragDepth: depth layout is declared here "
2534 "as '%s, but it was previously declared as "
2536 depth_layout_string(var
->data
.depth_layout
),
2537 depth_layout_string(earlier
->data
.depth_layout
));
2540 earlier
->data
.depth_layout
= var
->data
.depth_layout
;
2542 } else if (allow_all_redeclarations
) {
2543 if (earlier
->data
.mode
!= var
->data
.mode
) {
2544 _mesa_glsl_error(&loc
, state
,
2545 "redeclaration of `%s' with incorrect qualifiers",
2547 } else if (earlier
->type
!= var
->type
) {
2548 _mesa_glsl_error(&loc
, state
,
2549 "redeclaration of `%s' has incorrect type",
2553 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", var
->name
);
2560 * Generate the IR for an initializer in a variable declaration
2563 process_initializer(ir_variable
*var
, ast_declaration
*decl
,
2564 ast_fully_specified_type
*type
,
2565 exec_list
*initializer_instructions
,
2566 struct _mesa_glsl_parse_state
*state
)
2568 ir_rvalue
*result
= NULL
;
2570 YYLTYPE initializer_loc
= decl
->initializer
->get_location();
2572 /* From page 24 (page 30 of the PDF) of the GLSL 1.10 spec:
2574 * "All uniform variables are read-only and are initialized either
2575 * directly by an application via API commands, or indirectly by
2578 if (var
->data
.mode
== ir_var_uniform
) {
2579 state
->check_version(120, 0, &initializer_loc
,
2580 "cannot initialize uniforms");
2583 if (var
->type
->is_sampler()) {
2584 _mesa_glsl_error(& initializer_loc
, state
,
2585 "cannot initialize samplers");
2588 if ((var
->data
.mode
== ir_var_shader_in
) && (state
->current_function
== NULL
)) {
2589 _mesa_glsl_error(& initializer_loc
, state
,
2590 "cannot initialize %s shader input / %s",
2591 _mesa_shader_stage_to_string(state
->stage
),
2592 (state
->stage
== MESA_SHADER_VERTEX
)
2593 ? "attribute" : "varying");
2596 ir_dereference
*const lhs
= new(state
) ir_dereference_variable(var
);
2597 ir_rvalue
*rhs
= decl
->initializer
->hir(initializer_instructions
,
2600 /* Calculate the constant value if this is a const or uniform
2603 if (type
->qualifier
.flags
.q
.constant
2604 || type
->qualifier
.flags
.q
.uniform
) {
2605 ir_rvalue
*new_rhs
= validate_assignment(state
, initializer_loc
,
2606 var
->type
, rhs
, true);
2607 if (new_rhs
!= NULL
) {
2610 ir_constant
*constant_value
= rhs
->constant_expression_value();
2611 if (!constant_value
) {
2612 /* If ARB_shading_language_420pack is enabled, initializers of
2613 * const-qualified local variables do not have to be constant
2614 * expressions. Const-qualified global variables must still be
2615 * initialized with constant expressions.
2617 if (!state
->ARB_shading_language_420pack_enable
2618 || state
->current_function
== NULL
) {
2619 _mesa_glsl_error(& initializer_loc
, state
,
2620 "initializer of %s variable `%s' must be a "
2621 "constant expression",
2622 (type
->qualifier
.flags
.q
.constant
)
2623 ? "const" : "uniform",
2625 if (var
->type
->is_numeric()) {
2626 /* Reduce cascading errors. */
2627 var
->constant_value
= ir_constant::zero(state
, var
->type
);
2631 rhs
= constant_value
;
2632 var
->constant_value
= constant_value
;
2635 if (var
->type
->is_numeric()) {
2636 /* Reduce cascading errors. */
2637 var
->constant_value
= ir_constant::zero(state
, var
->type
);
2642 if (rhs
&& !rhs
->type
->is_error()) {
2643 bool temp
= var
->data
.read_only
;
2644 if (type
->qualifier
.flags
.q
.constant
)
2645 var
->data
.read_only
= false;
2647 /* Never emit code to initialize a uniform.
2649 const glsl_type
*initializer_type
;
2650 if (!type
->qualifier
.flags
.q
.uniform
) {
2651 result
= do_assignment(initializer_instructions
, state
,
2654 type
->get_location());
2655 initializer_type
= result
->type
;
2657 initializer_type
= rhs
->type
;
2659 var
->constant_initializer
= rhs
->constant_expression_value();
2660 var
->data
.has_initializer
= true;
2662 /* If the declared variable is an unsized array, it must inherrit
2663 * its full type from the initializer. A declaration such as
2665 * uniform float a[] = float[](1.0, 2.0, 3.0, 3.0);
2669 * uniform float a[4] = float[](1.0, 2.0, 3.0, 3.0);
2671 * The assignment generated in the if-statement (below) will also
2672 * automatically handle this case for non-uniforms.
2674 * If the declared variable is not an array, the types must
2675 * already match exactly. As a result, the type assignment
2676 * here can be done unconditionally. For non-uniforms the call
2677 * to do_assignment can change the type of the initializer (via
2678 * the implicit conversion rules). For uniforms the initializer
2679 * must be a constant expression, and the type of that expression
2680 * was validated above.
2682 var
->type
= initializer_type
;
2684 var
->data
.read_only
= temp
;
2692 * Do additional processing necessary for geometry shader input declarations
2693 * (this covers both interface blocks arrays and bare input variables).
2696 handle_geometry_shader_input_decl(struct _mesa_glsl_parse_state
*state
,
2697 YYLTYPE loc
, ir_variable
*var
)
2699 unsigned num_vertices
= 0;
2700 if (state
->gs_input_prim_type_specified
) {
2701 num_vertices
= vertices_per_prim(state
->gs_input_prim_type
);
2704 /* Geometry shader input variables must be arrays. Caller should have
2705 * reported an error for this.
2707 if (!var
->type
->is_array()) {
2708 assert(state
->error
);
2710 /* To avoid cascading failures, short circuit the checks below. */
2714 if (var
->type
->is_unsized_array()) {
2715 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec says:
2717 * All geometry shader input unsized array declarations will be
2718 * sized by an earlier input layout qualifier, when present, as per
2719 * the following table.
2721 * Followed by a table mapping each allowed input layout qualifier to
2722 * the corresponding input length.
2724 if (num_vertices
!= 0)
2725 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
2728 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec
2729 * includes the following examples of compile-time errors:
2731 * // code sequence within one shader...
2732 * in vec4 Color1[]; // size unknown
2733 * ...Color1.length()...// illegal, length() unknown
2734 * in vec4 Color2[2]; // size is 2
2735 * ...Color1.length()...// illegal, Color1 still has no size
2736 * in vec4 Color3[3]; // illegal, input sizes are inconsistent
2737 * layout(lines) in; // legal, input size is 2, matching
2738 * in vec4 Color4[3]; // illegal, contradicts layout
2741 * To detect the case illustrated by Color3, we verify that the size of
2742 * an explicitly-sized array matches the size of any previously declared
2743 * explicitly-sized array. To detect the case illustrated by Color4, we
2744 * verify that the size of an explicitly-sized array is consistent with
2745 * any previously declared input layout.
2747 if (num_vertices
!= 0 && var
->type
->length
!= num_vertices
) {
2748 _mesa_glsl_error(&loc
, state
,
2749 "geometry shader input size contradicts previously"
2750 " declared layout (size is %u, but layout requires a"
2751 " size of %u)", var
->type
->length
, num_vertices
);
2752 } else if (state
->gs_input_size
!= 0 &&
2753 var
->type
->length
!= state
->gs_input_size
) {
2754 _mesa_glsl_error(&loc
, state
,
2755 "geometry shader input sizes are "
2756 "inconsistent (size is %u, but a previous "
2757 "declaration has size %u)",
2758 var
->type
->length
, state
->gs_input_size
);
2760 state
->gs_input_size
= var
->type
->length
;
2767 validate_identifier(const char *identifier
, YYLTYPE loc
,
2768 struct _mesa_glsl_parse_state
*state
)
2770 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
2772 * "Identifiers starting with "gl_" are reserved for use by
2773 * OpenGL, and may not be declared in a shader as either a
2774 * variable or a function."
2776 if (strncmp(identifier
, "gl_", 3) == 0) {
2777 _mesa_glsl_error(&loc
, state
,
2778 "identifier `%s' uses reserved `gl_' prefix",
2780 } else if (strstr(identifier
, "__")) {
2781 /* From page 14 (page 20 of the PDF) of the GLSL 1.10
2784 * "In addition, all identifiers containing two
2785 * consecutive underscores (__) are reserved as
2786 * possible future keywords."
2788 _mesa_glsl_error(&loc
, state
,
2789 "identifier `%s' uses reserved `__' string",
2796 ast_declarator_list::hir(exec_list
*instructions
,
2797 struct _mesa_glsl_parse_state
*state
)
2800 const struct glsl_type
*decl_type
;
2801 const char *type_name
= NULL
;
2802 ir_rvalue
*result
= NULL
;
2803 YYLTYPE loc
= this->get_location();
2805 /* From page 46 (page 52 of the PDF) of the GLSL 1.50 spec:
2807 * "To ensure that a particular output variable is invariant, it is
2808 * necessary to use the invariant qualifier. It can either be used to
2809 * qualify a previously declared variable as being invariant
2811 * invariant gl_Position; // make existing gl_Position be invariant"
2813 * In these cases the parser will set the 'invariant' flag in the declarator
2814 * list, and the type will be NULL.
2816 if (this->invariant
) {
2817 assert(this->type
== NULL
);
2819 if (state
->current_function
!= NULL
) {
2820 _mesa_glsl_error(& loc
, state
,
2821 "all uses of `invariant' keyword must be at global "
2825 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
2826 assert(!decl
->is_array
);
2827 assert(decl
->array_size
== NULL
);
2828 assert(decl
->initializer
== NULL
);
2830 ir_variable
*const earlier
=
2831 state
->symbols
->get_variable(decl
->identifier
);
2832 if (earlier
== NULL
) {
2833 _mesa_glsl_error(& loc
, state
,
2834 "undeclared variable `%s' cannot be marked "
2835 "invariant", decl
->identifier
);
2836 } else if ((state
->stage
== MESA_SHADER_VERTEX
)
2837 && (earlier
->data
.mode
!= ir_var_shader_out
)) {
2838 _mesa_glsl_error(& loc
, state
,
2839 "`%s' cannot be marked invariant, vertex shader "
2840 "outputs only", decl
->identifier
);
2841 } else if ((state
->stage
== MESA_SHADER_FRAGMENT
)
2842 && (earlier
->data
.mode
!= ir_var_shader_in
)) {
2843 _mesa_glsl_error(& loc
, state
,
2844 "`%s' cannot be marked invariant, fragment shader "
2845 "inputs only", decl
->identifier
);
2846 } else if (earlier
->data
.used
) {
2847 _mesa_glsl_error(& loc
, state
,
2848 "variable `%s' may not be redeclared "
2849 "`invariant' after being used",
2852 earlier
->data
.invariant
= true;
2856 /* Invariant redeclarations do not have r-values.
2861 assert(this->type
!= NULL
);
2862 assert(!this->invariant
);
2864 /* The type specifier may contain a structure definition. Process that
2865 * before any of the variable declarations.
2867 (void) this->type
->specifier
->hir(instructions
, state
);
2869 decl_type
= this->type
->glsl_type(& type_name
, state
);
2871 /* An offset-qualified atomic counter declaration sets the default
2872 * offset for the next declaration within the same atomic counter
2875 if (decl_type
&& decl_type
->contains_atomic()) {
2876 if (type
->qualifier
.flags
.q
.explicit_binding
&&
2877 type
->qualifier
.flags
.q
.explicit_offset
)
2878 state
->atomic_counter_offsets
[type
->qualifier
.binding
] =
2879 type
->qualifier
.offset
;
2882 if (this->declarations
.is_empty()) {
2883 /* If there is no structure involved in the program text, there are two
2884 * possible scenarios:
2886 * - The program text contained something like 'vec4;'. This is an
2887 * empty declaration. It is valid but weird. Emit a warning.
2889 * - The program text contained something like 'S;' and 'S' is not the
2890 * name of a known structure type. This is both invalid and weird.
2893 * - The program text contained something like 'mediump float;'
2894 * when the programmer probably meant 'precision mediump
2895 * float;' Emit a warning with a description of what they
2896 * probably meant to do.
2898 * Note that if decl_type is NULL and there is a structure involved,
2899 * there must have been some sort of error with the structure. In this
2900 * case we assume that an error was already generated on this line of
2901 * code for the structure. There is no need to generate an additional,
2904 assert(this->type
->specifier
->structure
== NULL
|| decl_type
!= NULL
2907 if (decl_type
== NULL
) {
2908 _mesa_glsl_error(&loc
, state
,
2909 "invalid type `%s' in empty declaration",
2911 } else if (decl_type
->base_type
== GLSL_TYPE_ATOMIC_UINT
) {
2912 /* Empty atomic counter declarations are allowed and useful
2913 * to set the default offset qualifier.
2916 } else if (this->type
->qualifier
.precision
!= ast_precision_none
) {
2917 if (this->type
->specifier
->structure
!= NULL
) {
2918 _mesa_glsl_error(&loc
, state
,
2919 "precision qualifiers can't be applied "
2922 static const char *const precision_names
[] = {
2929 _mesa_glsl_warning(&loc
, state
,
2930 "empty declaration with precision qualifier, "
2931 "to set the default precision, use "
2932 "`precision %s %s;'",
2933 precision_names
[this->type
->qualifier
.precision
],
2936 } else if (this->type
->specifier
->structure
== NULL
) {
2937 _mesa_glsl_warning(&loc
, state
, "empty declaration");
2941 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
2942 const struct glsl_type
*var_type
;
2945 /* FINISHME: Emit a warning if a variable declaration shadows a
2946 * FINISHME: declaration at a higher scope.
2949 if ((decl_type
== NULL
) || decl_type
->is_void()) {
2950 if (type_name
!= NULL
) {
2951 _mesa_glsl_error(& loc
, state
,
2952 "invalid type `%s' in declaration of `%s'",
2953 type_name
, decl
->identifier
);
2955 _mesa_glsl_error(& loc
, state
,
2956 "invalid type in declaration of `%s'",
2962 if (decl
->is_array
) {
2963 var_type
= process_array_type(&loc
, decl_type
, decl
->array_size
,
2965 if (var_type
->is_error())
2968 var_type
= decl_type
;
2971 var
= new(ctx
) ir_variable(var_type
, decl
->identifier
, ir_var_auto
);
2973 /* The 'varying in' and 'varying out' qualifiers can only be used with
2974 * ARB_geometry_shader4 and EXT_geometry_shader4, which we don't support
2977 if (this->type
->qualifier
.flags
.q
.varying
) {
2978 if (this->type
->qualifier
.flags
.q
.in
) {
2979 _mesa_glsl_error(& loc
, state
,
2980 "`varying in' qualifier in declaration of "
2981 "`%s' only valid for geometry shaders using "
2982 "ARB_geometry_shader4 or EXT_geometry_shader4",
2984 } else if (this->type
->qualifier
.flags
.q
.out
) {
2985 _mesa_glsl_error(& loc
, state
,
2986 "`varying out' qualifier in declaration of "
2987 "`%s' only valid for geometry shaders using "
2988 "ARB_geometry_shader4 or EXT_geometry_shader4",
2993 /* From page 22 (page 28 of the PDF) of the GLSL 1.10 specification;
2995 * "Global variables can only use the qualifiers const,
2996 * attribute, uni form, or varying. Only one may be
2999 * Local variables can only use the qualifier const."
3001 * This is relaxed in GLSL 1.30 and GLSL ES 3.00. It is also relaxed by
3002 * any extension that adds the 'layout' keyword.
3004 if (!state
->is_version(130, 300)
3005 && !state
->has_explicit_attrib_location()
3006 && !state
->ARB_fragment_coord_conventions_enable
) {
3007 if (this->type
->qualifier
.flags
.q
.out
) {
3008 _mesa_glsl_error(& loc
, state
,
3009 "`out' qualifier in declaration of `%s' "
3010 "only valid for function parameters in %s",
3011 decl
->identifier
, state
->get_version_string());
3013 if (this->type
->qualifier
.flags
.q
.in
) {
3014 _mesa_glsl_error(& loc
, state
,
3015 "`in' qualifier in declaration of `%s' "
3016 "only valid for function parameters in %s",
3017 decl
->identifier
, state
->get_version_string());
3019 /* FINISHME: Test for other invalid qualifiers. */
3022 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
,
3025 if (this->type
->qualifier
.flags
.q
.invariant
) {
3026 if ((state
->stage
== MESA_SHADER_VERTEX
) &&
3027 var
->data
.mode
!= ir_var_shader_out
) {
3028 _mesa_glsl_error(& loc
, state
,
3029 "`%s' cannot be marked invariant, vertex shader "
3030 "outputs only", var
->name
);
3031 } else if ((state
->stage
== MESA_SHADER_FRAGMENT
) &&
3032 var
->data
.mode
!= ir_var_shader_in
) {
3033 /* FINISHME: Note that this doesn't work for invariant on
3034 * a function signature inval
3036 _mesa_glsl_error(& loc
, state
,
3037 "`%s' cannot be marked invariant, fragment shader "
3038 "inputs only", var
->name
);
3042 if (state
->current_function
!= NULL
) {
3043 const char *mode
= NULL
;
3044 const char *extra
= "";
3046 /* There is no need to check for 'inout' here because the parser will
3047 * only allow that in function parameter lists.
3049 if (this->type
->qualifier
.flags
.q
.attribute
) {
3051 } else if (this->type
->qualifier
.flags
.q
.uniform
) {
3053 } else if (this->type
->qualifier
.flags
.q
.varying
) {
3055 } else if (this->type
->qualifier
.flags
.q
.in
) {
3057 extra
= " or in function parameter list";
3058 } else if (this->type
->qualifier
.flags
.q
.out
) {
3060 extra
= " or in function parameter list";
3064 _mesa_glsl_error(& loc
, state
,
3065 "%s variable `%s' must be declared at "
3067 mode
, var
->name
, extra
);
3069 } else if (var
->data
.mode
== ir_var_shader_in
) {
3070 var
->data
.read_only
= true;
3072 if (state
->stage
== MESA_SHADER_VERTEX
) {
3073 bool error_emitted
= false;
3075 /* From page 31 (page 37 of the PDF) of the GLSL 1.50 spec:
3077 * "Vertex shader inputs can only be float, floating-point
3078 * vectors, matrices, signed and unsigned integers and integer
3079 * vectors. Vertex shader inputs can also form arrays of these
3080 * types, but not structures."
3082 * From page 31 (page 27 of the PDF) of the GLSL 1.30 spec:
3084 * "Vertex shader inputs can only be float, floating-point
3085 * vectors, matrices, signed and unsigned integers and integer
3086 * vectors. They cannot be arrays or structures."
3088 * From page 23 (page 29 of the PDF) of the GLSL 1.20 spec:
3090 * "The attribute qualifier can be used only with float,
3091 * floating-point vectors, and matrices. Attribute variables
3092 * cannot be declared as arrays or structures."
3094 * From page 33 (page 39 of the PDF) of the GLSL ES 3.00 spec:
3096 * "Vertex shader inputs can only be float, floating-point
3097 * vectors, matrices, signed and unsigned integers and integer
3098 * vectors. Vertex shader inputs cannot be arrays or
3101 const glsl_type
*check_type
= var
->type
->is_array()
3102 ? var
->type
->fields
.array
: var
->type
;
3104 switch (check_type
->base_type
) {
3105 case GLSL_TYPE_FLOAT
:
3107 case GLSL_TYPE_UINT
:
3109 if (state
->is_version(120, 300))
3113 _mesa_glsl_error(& loc
, state
,
3114 "vertex shader input / attribute cannot have "
3116 var
->type
->is_array() ? "array of " : "",
3118 error_emitted
= true;
3121 if (!error_emitted
&& var
->type
->is_array() &&
3122 !state
->check_version(150, 0, &loc
,
3123 "vertex shader input / attribute "
3124 "cannot have array type")) {
3125 error_emitted
= true;
3127 } else if (state
->stage
== MESA_SHADER_GEOMETRY
) {
3128 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
3130 * Geometry shader input variables get the per-vertex values
3131 * written out by vertex shader output variables of the same
3132 * names. Since a geometry shader operates on a set of
3133 * vertices, each input varying variable (or input block, see
3134 * interface blocks below) needs to be declared as an array.
3136 if (!var
->type
->is_array()) {
3137 _mesa_glsl_error(&loc
, state
,
3138 "geometry shader inputs must be arrays");
3141 handle_geometry_shader_input_decl(state
, loc
, var
);
3145 /* Integer fragment inputs must be qualified with 'flat'. In GLSL ES,
3146 * so must integer vertex outputs.
3148 * From section 4.3.4 ("Inputs") of the GLSL 1.50 spec:
3149 * "Fragment shader inputs that are signed or unsigned integers or
3150 * integer vectors must be qualified with the interpolation qualifier
3153 * From section 4.3.4 ("Input Variables") of the GLSL 3.00 ES spec:
3154 * "Fragment shader inputs that are, or contain, signed or unsigned
3155 * integers or integer vectors must be qualified with the
3156 * interpolation qualifier flat."
3158 * From section 4.3.6 ("Output Variables") of the GLSL 3.00 ES spec:
3159 * "Vertex shader outputs that are, or contain, signed or unsigned
3160 * integers or integer vectors must be qualified with the
3161 * interpolation qualifier flat."
3163 * Note that prior to GLSL 1.50, this requirement applied to vertex
3164 * outputs rather than fragment inputs. That creates problems in the
3165 * presence of geometry shaders, so we adopt the GLSL 1.50 rule for all
3166 * desktop GL shaders. For GLSL ES shaders, we follow the spec and
3167 * apply the restriction to both vertex outputs and fragment inputs.
3169 * Note also that the desktop GLSL specs are missing the text "or
3170 * contain"; this is presumably an oversight, since there is no
3171 * reasonable way to interpolate a fragment shader input that contains
3174 if (state
->is_version(130, 300) &&
3175 var
->type
->contains_integer() &&
3176 var
->data
.interpolation
!= INTERP_QUALIFIER_FLAT
&&
3177 ((state
->stage
== MESA_SHADER_FRAGMENT
&& var
->data
.mode
== ir_var_shader_in
)
3178 || (state
->stage
== MESA_SHADER_VERTEX
&& var
->data
.mode
== ir_var_shader_out
3179 && state
->es_shader
))) {
3180 const char *var_type
= (state
->stage
== MESA_SHADER_VERTEX
) ?
3181 "vertex output" : "fragment input";
3182 _mesa_glsl_error(&loc
, state
, "if a %s is (or contains) "
3183 "an integer, then it must be qualified with 'flat'",
3188 /* Interpolation qualifiers cannot be applied to 'centroid' and
3189 * 'centroid varying'.
3191 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
3192 * "interpolation qualifiers may only precede the qualifiers in,
3193 * centroid in, out, or centroid out in a declaration. They do not apply
3194 * to the deprecated storage qualifiers varying or centroid varying."
3196 * These deprecated storage qualifiers do not exist in GLSL ES 3.00.
3198 if (state
->is_version(130, 0)
3199 && this->type
->qualifier
.has_interpolation()
3200 && this->type
->qualifier
.flags
.q
.varying
) {
3202 const char *i
= this->type
->qualifier
.interpolation_string();
3205 if (this->type
->qualifier
.flags
.q
.centroid
)
3206 s
= "centroid varying";
3210 _mesa_glsl_error(&loc
, state
,
3211 "qualifier '%s' cannot be applied to the "
3212 "deprecated storage qualifier '%s'", i
, s
);
3216 /* Interpolation qualifiers can only apply to vertex shader outputs and
3217 * fragment shader inputs.
3219 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
3220 * "Outputs from a vertex shader (out) and inputs to a fragment
3221 * shader (in) can be further qualified with one or more of these
3222 * interpolation qualifiers"
3224 * From page 31 (page 37 of the PDF) of the GLSL ES 3.00 spec:
3225 * "These interpolation qualifiers may only precede the qualifiers
3226 * in, centroid in, out, or centroid out in a declaration. They do
3227 * not apply to inputs into a vertex shader or outputs from a
3230 if (state
->is_version(130, 300)
3231 && this->type
->qualifier
.has_interpolation()) {
3233 const char *i
= this->type
->qualifier
.interpolation_string();
3236 switch (state
->stage
) {
3237 case MESA_SHADER_VERTEX
:
3238 if (this->type
->qualifier
.flags
.q
.in
) {
3239 _mesa_glsl_error(&loc
, state
,
3240 "qualifier '%s' cannot be applied to vertex "
3241 "shader inputs", i
);
3244 case MESA_SHADER_FRAGMENT
:
3245 if (this->type
->qualifier
.flags
.q
.out
) {
3246 _mesa_glsl_error(&loc
, state
,
3247 "qualifier '%s' cannot be applied to fragment "
3248 "shader outputs", i
);
3257 /* From section 4.3.4 of the GLSL 1.30 spec:
3258 * "It is an error to use centroid in in a vertex shader."
3260 * From section 4.3.4 of the GLSL ES 3.00 spec:
3261 * "It is an error to use centroid in or interpolation qualifiers in
3262 * a vertex shader input."
3264 if (state
->is_version(130, 300)
3265 && this->type
->qualifier
.flags
.q
.centroid
3266 && this->type
->qualifier
.flags
.q
.in
3267 && state
->stage
== MESA_SHADER_VERTEX
) {
3269 _mesa_glsl_error(&loc
, state
,
3270 "'centroid in' cannot be used in a vertex shader");
3273 if (state
->stage
== MESA_SHADER_VERTEX
3274 && this->type
->qualifier
.flags
.q
.sample
3275 && this->type
->qualifier
.flags
.q
.in
) {
3277 _mesa_glsl_error(&loc
, state
,
3278 "'sample in' cannot be used in a vertex shader");
3281 /* Section 4.3.6 of the GLSL 1.30 specification states:
3282 * "It is an error to use centroid out in a fragment shader."
3284 * The GL_ARB_shading_language_420pack extension specification states:
3285 * "It is an error to use auxiliary storage qualifiers or interpolation
3286 * qualifiers on an output in a fragment shader."
3288 if (state
->stage
== MESA_SHADER_FRAGMENT
&&
3289 this->type
->qualifier
.flags
.q
.out
&&
3290 this->type
->qualifier
.has_auxiliary_storage()) {
3291 _mesa_glsl_error(&loc
, state
,
3292 "auxiliary storage qualifiers cannot be used on "
3293 "fragment shader outputs");
3296 /* Precision qualifiers exists only in GLSL versions 1.00 and >= 1.30.
3298 if (this->type
->qualifier
.precision
!= ast_precision_none
) {
3299 state
->check_precision_qualifiers_allowed(&loc
);
3303 /* Precision qualifiers apply to floating point, integer and sampler
3306 * Section 4.5.2 (Precision Qualifiers) of the GLSL 1.30 spec says:
3307 * "Any floating point or any integer declaration can have the type
3308 * preceded by one of these precision qualifiers [...] Literal
3309 * constants do not have precision qualifiers. Neither do Boolean
3312 * Section 4.5 (Precision and Precision Qualifiers) of the GLSL 1.30
3315 * "Precision qualifiers are added for code portability with OpenGL
3316 * ES, not for functionality. They have the same syntax as in OpenGL
3319 * Section 8 (Built-In Functions) of the GLSL ES 1.00 spec says:
3321 * "uniform lowp sampler2D sampler;
3324 * lowp vec4 col = texture2D (sampler, coord);
3325 * // texture2D returns lowp"
3327 * From this, we infer that GLSL 1.30 (and later) should allow precision
3328 * qualifiers on sampler types just like float and integer types.
3330 if (this->type
->qualifier
.precision
!= ast_precision_none
3331 && !var
->type
->is_float()
3332 && !var
->type
->is_integer()
3333 && !var
->type
->is_record()
3334 && !var
->type
->is_sampler()
3335 && !(var
->type
->is_array()
3336 && (var
->type
->fields
.array
->is_float()
3337 || var
->type
->fields
.array
->is_integer()))) {
3339 _mesa_glsl_error(&loc
, state
,
3340 "precision qualifiers apply only to floating point"
3341 ", integer and sampler types");
3344 /* From page 17 (page 23 of the PDF) of the GLSL 1.20 spec:
3346 * "[Sampler types] can only be declared as function
3347 * parameters or uniform variables (see Section 4.3.5
3350 if (var_type
->contains_sampler() &&
3351 !this->type
->qualifier
.flags
.q
.uniform
) {
3352 _mesa_glsl_error(&loc
, state
, "samplers must be declared uniform");
3355 /* Process the initializer and add its instructions to a temporary
3356 * list. This list will be added to the instruction stream (below) after
3357 * the declaration is added. This is done because in some cases (such as
3358 * redeclarations) the declaration may not actually be added to the
3359 * instruction stream.
3361 exec_list initializer_instructions
;
3362 ir_variable
*earlier
=
3363 get_variable_being_redeclared(var
, decl
->get_location(), state
,
3364 false /* allow_all_redeclarations */);
3365 if (earlier
!= NULL
) {
3366 if (strncmp(var
->name
, "gl_", 3) == 0 &&
3367 earlier
->data
.how_declared
== ir_var_declared_in_block
) {
3368 _mesa_glsl_error(&loc
, state
,
3369 "`%s' has already been redeclared using "
3370 "gl_PerVertex", var
->name
);
3372 earlier
->data
.how_declared
= ir_var_declared_normally
;
3375 if (decl
->initializer
!= NULL
) {
3376 result
= process_initializer((earlier
== NULL
) ? var
: earlier
,
3378 &initializer_instructions
, state
);
3381 /* From page 23 (page 29 of the PDF) of the GLSL 1.10 spec:
3383 * "It is an error to write to a const variable outside of
3384 * its declaration, so they must be initialized when
3387 if (this->type
->qualifier
.flags
.q
.constant
&& decl
->initializer
== NULL
) {
3388 _mesa_glsl_error(& loc
, state
,
3389 "const declaration of `%s' must be initialized",
3393 if (state
->es_shader
) {
3394 const glsl_type
*const t
= (earlier
== NULL
)
3395 ? var
->type
: earlier
->type
;
3397 if (t
->is_unsized_array())
3398 /* Section 10.17 of the GLSL ES 1.00 specification states that
3399 * unsized array declarations have been removed from the language.
3400 * Arrays that are sized using an initializer are still explicitly
3401 * sized. However, GLSL ES 1.00 does not allow array
3402 * initializers. That is only allowed in GLSL ES 3.00.
3404 * Section 4.1.9 (Arrays) of the GLSL ES 3.00 spec says:
3406 * "An array type can also be formed without specifying a size
3407 * if the definition includes an initializer:
3409 * float x[] = float[2] (1.0, 2.0); // declares an array of size 2
3410 * float y[] = float[] (1.0, 2.0, 3.0); // declares an array of size 3
3415 _mesa_glsl_error(& loc
, state
,
3416 "unsized array declarations are not allowed in "
3420 /* If the declaration is not a redeclaration, there are a few additional
3421 * semantic checks that must be applied. In addition, variable that was
3422 * created for the declaration should be added to the IR stream.
3424 if (earlier
== NULL
) {
3425 validate_identifier(decl
->identifier
, loc
, state
);
3427 /* Add the variable to the symbol table. Note that the initializer's
3428 * IR was already processed earlier (though it hasn't been emitted
3429 * yet), without the variable in scope.
3431 * This differs from most C-like languages, but it follows the GLSL
3432 * specification. From page 28 (page 34 of the PDF) of the GLSL 1.50
3435 * "Within a declaration, the scope of a name starts immediately
3436 * after the initializer if present or immediately after the name
3437 * being declared if not."
3439 if (!state
->symbols
->add_variable(var
)) {
3440 YYLTYPE loc
= this->get_location();
3441 _mesa_glsl_error(&loc
, state
, "name `%s' already taken in the "
3442 "current scope", decl
->identifier
);
3446 /* Push the variable declaration to the top. It means that all the
3447 * variable declarations will appear in a funny last-to-first order,
3448 * but otherwise we run into trouble if a function is prototyped, a
3449 * global var is decled, then the function is defined with usage of
3450 * the global var. See glslparsertest's CorrectModule.frag.
3452 instructions
->push_head(var
);
3455 instructions
->append_list(&initializer_instructions
);
3459 /* Generally, variable declarations do not have r-values. However,
3460 * one is used for the declaration in
3462 * while (bool b = some_condition()) {
3466 * so we return the rvalue from the last seen declaration here.
3473 ast_parameter_declarator::hir(exec_list
*instructions
,
3474 struct _mesa_glsl_parse_state
*state
)
3477 const struct glsl_type
*type
;
3478 const char *name
= NULL
;
3479 YYLTYPE loc
= this->get_location();
3481 type
= this->type
->glsl_type(& name
, state
);
3485 _mesa_glsl_error(& loc
, state
,
3486 "invalid type `%s' in declaration of `%s'",
3487 name
, this->identifier
);
3489 _mesa_glsl_error(& loc
, state
,
3490 "invalid type in declaration of `%s'",
3494 type
= glsl_type::error_type
;
3497 /* From page 62 (page 68 of the PDF) of the GLSL 1.50 spec:
3499 * "Functions that accept no input arguments need not use void in the
3500 * argument list because prototypes (or definitions) are required and
3501 * therefore there is no ambiguity when an empty argument list "( )" is
3502 * declared. The idiom "(void)" as a parameter list is provided for
3505 * Placing this check here prevents a void parameter being set up
3506 * for a function, which avoids tripping up checks for main taking
3507 * parameters and lookups of an unnamed symbol.
3509 if (type
->is_void()) {
3510 if (this->identifier
!= NULL
)
3511 _mesa_glsl_error(& loc
, state
,
3512 "named parameter cannot have type `void'");
3518 if (formal_parameter
&& (this->identifier
== NULL
)) {
3519 _mesa_glsl_error(& loc
, state
, "formal parameter lacks a name");
3523 /* This only handles "vec4 foo[..]". The earlier specifier->glsl_type(...)
3524 * call already handled the "vec4[..] foo" case.
3526 if (this->is_array
) {
3527 type
= process_array_type(&loc
, type
, this->array_size
, state
);
3530 if (!type
->is_error() && type
->is_unsized_array()) {
3531 _mesa_glsl_error(&loc
, state
, "arrays passed as parameters must have "
3533 type
= glsl_type::error_type
;
3537 ir_variable
*var
= new(ctx
)
3538 ir_variable(type
, this->identifier
, ir_var_function_in
);
3540 /* Apply any specified qualifiers to the parameter declaration. Note that
3541 * for function parameters the default mode is 'in'.
3543 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
, & loc
,
3546 /* From page 17 (page 23 of the PDF) of the GLSL 1.20 spec:
3548 * "Samplers cannot be treated as l-values; hence cannot be used
3549 * as out or inout function parameters, nor can they be assigned
3552 if ((var
->data
.mode
== ir_var_function_inout
|| var
->data
.mode
== ir_var_function_out
)
3553 && type
->contains_sampler()) {
3554 _mesa_glsl_error(&loc
, state
, "out and inout parameters cannot contain samplers");
3555 type
= glsl_type::error_type
;
3558 /* From page 39 (page 45 of the PDF) of the GLSL 1.10 spec:
3560 * "When calling a function, expressions that do not evaluate to
3561 * l-values cannot be passed to parameters declared as out or inout."
3563 * From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
3565 * "Other binary or unary expressions, non-dereferenced arrays,
3566 * function names, swizzles with repeated fields, and constants
3567 * cannot be l-values."
3569 * So for GLSL 1.10, passing an array as an out or inout parameter is not
3570 * allowed. This restriction is removed in GLSL 1.20, and in GLSL ES.
3572 if ((var
->data
.mode
== ir_var_function_inout
|| var
->data
.mode
== ir_var_function_out
)
3574 && !state
->check_version(120, 100, &loc
,
3575 "arrays cannot be out or inout parameters")) {
3576 type
= glsl_type::error_type
;
3579 instructions
->push_tail(var
);
3581 /* Parameter declarations do not have r-values.
3588 ast_parameter_declarator::parameters_to_hir(exec_list
*ast_parameters
,
3590 exec_list
*ir_parameters
,
3591 _mesa_glsl_parse_state
*state
)
3593 ast_parameter_declarator
*void_param
= NULL
;
3596 foreach_list_typed (ast_parameter_declarator
, param
, link
, ast_parameters
) {
3597 param
->formal_parameter
= formal
;
3598 param
->hir(ir_parameters
, state
);
3606 if ((void_param
!= NULL
) && (count
> 1)) {
3607 YYLTYPE loc
= void_param
->get_location();
3609 _mesa_glsl_error(& loc
, state
,
3610 "`void' parameter must be only parameter");
3616 emit_function(_mesa_glsl_parse_state
*state
, ir_function
*f
)
3618 /* IR invariants disallow function declarations or definitions
3619 * nested within other function definitions. But there is no
3620 * requirement about the relative order of function declarations
3621 * and definitions with respect to one another. So simply insert
3622 * the new ir_function block at the end of the toplevel instruction
3625 state
->toplevel_ir
->push_tail(f
);
3630 ast_function::hir(exec_list
*instructions
,
3631 struct _mesa_glsl_parse_state
*state
)
3634 ir_function
*f
= NULL
;
3635 ir_function_signature
*sig
= NULL
;
3636 exec_list hir_parameters
;
3638 const char *const name
= identifier
;
3640 /* New functions are always added to the top-level IR instruction stream,
3641 * so this instruction list pointer is ignored. See also emit_function
3644 (void) instructions
;
3646 /* From page 21 (page 27 of the PDF) of the GLSL 1.20 spec,
3648 * "Function declarations (prototypes) cannot occur inside of functions;
3649 * they must be at global scope, or for the built-in functions, outside
3650 * the global scope."
3652 * From page 27 (page 33 of the PDF) of the GLSL ES 1.00.16 spec,
3654 * "User defined functions may only be defined within the global scope."
3656 * Note that this language does not appear in GLSL 1.10.
3658 if ((state
->current_function
!= NULL
) &&
3659 state
->is_version(120, 100)) {
3660 YYLTYPE loc
= this->get_location();
3661 _mesa_glsl_error(&loc
, state
,
3662 "declaration of function `%s' not allowed within "
3663 "function body", name
);
3666 validate_identifier(name
, this->get_location(), state
);
3668 /* Convert the list of function parameters to HIR now so that they can be
3669 * used below to compare this function's signature with previously seen
3670 * signatures for functions with the same name.
3672 ast_parameter_declarator::parameters_to_hir(& this->parameters
,
3674 & hir_parameters
, state
);
3676 const char *return_type_name
;
3677 const glsl_type
*return_type
=
3678 this->return_type
->glsl_type(& return_type_name
, state
);
3681 YYLTYPE loc
= this->get_location();
3682 _mesa_glsl_error(&loc
, state
,
3683 "function `%s' has undeclared return type `%s'",
3684 name
, return_type_name
);
3685 return_type
= glsl_type::error_type
;
3688 /* From page 56 (page 62 of the PDF) of the GLSL 1.30 spec:
3689 * "No qualifier is allowed on the return type of a function."
3691 if (this->return_type
->has_qualifiers()) {
3692 YYLTYPE loc
= this->get_location();
3693 _mesa_glsl_error(& loc
, state
,
3694 "function `%s' return type has qualifiers", name
);
3697 /* Section 6.1 (Function Definitions) of the GLSL 1.20 spec says:
3699 * "Arrays are allowed as arguments and as the return type. In both
3700 * cases, the array must be explicitly sized."
3702 if (return_type
->is_unsized_array()) {
3703 YYLTYPE loc
= this->get_location();
3704 _mesa_glsl_error(& loc
, state
,
3705 "function `%s' return type array must be explicitly "
3709 /* From page 17 (page 23 of the PDF) of the GLSL 1.20 spec:
3711 * "[Sampler types] can only be declared as function parameters
3712 * or uniform variables (see Section 4.3.5 "Uniform")".
3714 if (return_type
->contains_sampler()) {
3715 YYLTYPE loc
= this->get_location();
3716 _mesa_glsl_error(&loc
, state
,
3717 "function `%s' return type can't contain a sampler",
3721 /* Verify that this function's signature either doesn't match a previously
3722 * seen signature for a function with the same name, or, if a match is found,
3723 * that the previously seen signature does not have an associated definition.
3725 f
= state
->symbols
->get_function(name
);
3726 if (f
!= NULL
&& (state
->es_shader
|| f
->has_user_signature())) {
3727 sig
= f
->exact_matching_signature(state
, &hir_parameters
);
3729 const char *badvar
= sig
->qualifiers_match(&hir_parameters
);
3730 if (badvar
!= NULL
) {
3731 YYLTYPE loc
= this->get_location();
3733 _mesa_glsl_error(&loc
, state
, "function `%s' parameter `%s' "
3734 "qualifiers don't match prototype", name
, badvar
);
3737 if (sig
->return_type
!= return_type
) {
3738 YYLTYPE loc
= this->get_location();
3740 _mesa_glsl_error(&loc
, state
, "function `%s' return type doesn't "
3741 "match prototype", name
);
3744 if (sig
->is_defined
) {
3745 if (is_definition
) {
3746 YYLTYPE loc
= this->get_location();
3747 _mesa_glsl_error(& loc
, state
, "function `%s' redefined", name
);
3749 /* We just encountered a prototype that exactly matches a
3750 * function that's already been defined. This is redundant,
3751 * and we should ignore it.
3758 f
= new(ctx
) ir_function(name
);
3759 if (!state
->symbols
->add_function(f
)) {
3760 /* This function name shadows a non-function use of the same name. */
3761 YYLTYPE loc
= this->get_location();
3763 _mesa_glsl_error(&loc
, state
, "function name `%s' conflicts with "
3764 "non-function", name
);
3768 emit_function(state
, f
);
3771 /* Verify the return type of main() */
3772 if (strcmp(name
, "main") == 0) {
3773 if (! return_type
->is_void()) {
3774 YYLTYPE loc
= this->get_location();
3776 _mesa_glsl_error(& loc
, state
, "main() must return void");
3779 if (!hir_parameters
.is_empty()) {
3780 YYLTYPE loc
= this->get_location();
3782 _mesa_glsl_error(& loc
, state
, "main() must not take any parameters");
3786 /* Finish storing the information about this new function in its signature.
3789 sig
= new(ctx
) ir_function_signature(return_type
);
3790 f
->add_signature(sig
);
3793 sig
->replace_parameters(&hir_parameters
);
3796 /* Function declarations (prototypes) do not have r-values.
3803 ast_function_definition::hir(exec_list
*instructions
,
3804 struct _mesa_glsl_parse_state
*state
)
3806 prototype
->is_definition
= true;
3807 prototype
->hir(instructions
, state
);
3809 ir_function_signature
*signature
= prototype
->signature
;
3810 if (signature
== NULL
)
3813 assert(state
->current_function
== NULL
);
3814 state
->current_function
= signature
;
3815 state
->found_return
= false;
3817 /* Duplicate parameters declared in the prototype as concrete variables.
3818 * Add these to the symbol table.
3820 state
->symbols
->push_scope();
3821 foreach_list(n
, &signature
->parameters
) {
3822 ir_variable
*const var
= ((ir_instruction
*) n
)->as_variable();
3824 assert(var
!= NULL
);
3826 /* The only way a parameter would "exist" is if two parameters have
3829 if (state
->symbols
->name_declared_this_scope(var
->name
)) {
3830 YYLTYPE loc
= this->get_location();
3832 _mesa_glsl_error(& loc
, state
, "parameter `%s' redeclared", var
->name
);
3834 state
->symbols
->add_variable(var
);
3838 /* Convert the body of the function to HIR. */
3839 this->body
->hir(&signature
->body
, state
);
3840 signature
->is_defined
= true;
3842 state
->symbols
->pop_scope();
3844 assert(state
->current_function
== signature
);
3845 state
->current_function
= NULL
;
3847 if (!signature
->return_type
->is_void() && !state
->found_return
) {
3848 YYLTYPE loc
= this->get_location();
3849 _mesa_glsl_error(& loc
, state
, "function `%s' has non-void return type "
3850 "%s, but no return statement",
3851 signature
->function_name(),
3852 signature
->return_type
->name
);
3855 /* Function definitions do not have r-values.
3862 ast_jump_statement::hir(exec_list
*instructions
,
3863 struct _mesa_glsl_parse_state
*state
)
3870 assert(state
->current_function
);
3872 if (opt_return_value
) {
3873 ir_rvalue
*ret
= opt_return_value
->hir(instructions
, state
);
3875 /* The value of the return type can be NULL if the shader says
3876 * 'return foo();' and foo() is a function that returns void.
3878 * NOTE: The GLSL spec doesn't say that this is an error. The type
3879 * of the return value is void. If the return type of the function is
3880 * also void, then this should compile without error. Seriously.
3882 const glsl_type
*const ret_type
=
3883 (ret
== NULL
) ? glsl_type::void_type
: ret
->type
;
3885 /* Implicit conversions are not allowed for return values prior to
3886 * ARB_shading_language_420pack.
3888 if (state
->current_function
->return_type
!= ret_type
) {
3889 YYLTYPE loc
= this->get_location();
3891 if (state
->ARB_shading_language_420pack_enable
) {
3892 if (!apply_implicit_conversion(state
->current_function
->return_type
,
3894 _mesa_glsl_error(& loc
, state
,
3895 "could not implicitly convert return value "
3896 "to %s, in function `%s'",
3897 state
->current_function
->return_type
->name
,
3898 state
->current_function
->function_name());
3901 _mesa_glsl_error(& loc
, state
,
3902 "`return' with wrong type %s, in function `%s' "
3905 state
->current_function
->function_name(),
3906 state
->current_function
->return_type
->name
);
3908 } else if (state
->current_function
->return_type
->base_type
==
3910 YYLTYPE loc
= this->get_location();
3912 /* The ARB_shading_language_420pack, GLSL ES 3.0, and GLSL 4.20
3913 * specs add a clarification:
3915 * "A void function can only use return without a return argument, even if
3916 * the return argument has void type. Return statements only accept values:
3919 * void func2() { return func1(); } // illegal return statement"
3921 _mesa_glsl_error(& loc
, state
,
3922 "void functions can only use `return' without a "
3926 inst
= new(ctx
) ir_return(ret
);
3928 if (state
->current_function
->return_type
->base_type
!=
3930 YYLTYPE loc
= this->get_location();
3932 _mesa_glsl_error(& loc
, state
,
3933 "`return' with no value, in function %s returning "
3935 state
->current_function
->function_name());
3937 inst
= new(ctx
) ir_return
;
3940 state
->found_return
= true;
3941 instructions
->push_tail(inst
);
3946 if (state
->stage
!= MESA_SHADER_FRAGMENT
) {
3947 YYLTYPE loc
= this->get_location();
3949 _mesa_glsl_error(& loc
, state
,
3950 "`discard' may only appear in a fragment shader");
3952 instructions
->push_tail(new(ctx
) ir_discard
);
3957 if (mode
== ast_continue
&&
3958 state
->loop_nesting_ast
== NULL
) {
3959 YYLTYPE loc
= this->get_location();
3961 _mesa_glsl_error(& loc
, state
,
3962 "continue may only appear in a loop");
3963 } else if (mode
== ast_break
&&
3964 state
->loop_nesting_ast
== NULL
&&
3965 state
->switch_state
.switch_nesting_ast
== NULL
) {
3966 YYLTYPE loc
= this->get_location();
3968 _mesa_glsl_error(& loc
, state
,
3969 "break may only appear in a loop or a switch");
3971 /* For a loop, inline the for loop expression again,
3972 * since we don't know where near the end of
3973 * the loop body the normal copy of it
3974 * is going to be placed.
3976 if (state
->loop_nesting_ast
!= NULL
&&
3977 mode
== ast_continue
&&
3978 state
->loop_nesting_ast
->rest_expression
) {
3979 state
->loop_nesting_ast
->rest_expression
->hir(instructions
,
3983 if (state
->switch_state
.is_switch_innermost
&&
3984 mode
== ast_break
) {
3985 /* Force break out of switch by setting is_break switch state.
3987 ir_variable
*const is_break_var
= state
->switch_state
.is_break_var
;
3988 ir_dereference_variable
*const deref_is_break_var
=
3989 new(ctx
) ir_dereference_variable(is_break_var
);
3990 ir_constant
*const true_val
= new(ctx
) ir_constant(true);
3991 ir_assignment
*const set_break_var
=
3992 new(ctx
) ir_assignment(deref_is_break_var
, true_val
);
3994 instructions
->push_tail(set_break_var
);
3997 ir_loop_jump
*const jump
=
3998 new(ctx
) ir_loop_jump((mode
== ast_break
)
3999 ? ir_loop_jump::jump_break
4000 : ir_loop_jump::jump_continue
);
4001 instructions
->push_tail(jump
);
4008 /* Jump instructions do not have r-values.
4015 ast_selection_statement::hir(exec_list
*instructions
,
4016 struct _mesa_glsl_parse_state
*state
)
4020 ir_rvalue
*const condition
= this->condition
->hir(instructions
, state
);
4022 /* From page 66 (page 72 of the PDF) of the GLSL 1.50 spec:
4024 * "Any expression whose type evaluates to a Boolean can be used as the
4025 * conditional expression bool-expression. Vector types are not accepted
4026 * as the expression to if."
4028 * The checks are separated so that higher quality diagnostics can be
4029 * generated for cases where both rules are violated.
4031 if (!condition
->type
->is_boolean() || !condition
->type
->is_scalar()) {
4032 YYLTYPE loc
= this->condition
->get_location();
4034 _mesa_glsl_error(& loc
, state
, "if-statement condition must be scalar "
4038 ir_if
*const stmt
= new(ctx
) ir_if(condition
);
4040 if (then_statement
!= NULL
) {
4041 state
->symbols
->push_scope();
4042 then_statement
->hir(& stmt
->then_instructions
, state
);
4043 state
->symbols
->pop_scope();
4046 if (else_statement
!= NULL
) {
4047 state
->symbols
->push_scope();
4048 else_statement
->hir(& stmt
->else_instructions
, state
);
4049 state
->symbols
->pop_scope();
4052 instructions
->push_tail(stmt
);
4054 /* if-statements do not have r-values.
4061 ast_switch_statement::hir(exec_list
*instructions
,
4062 struct _mesa_glsl_parse_state
*state
)
4066 ir_rvalue
*const test_expression
=
4067 this->test_expression
->hir(instructions
, state
);
4069 /* From page 66 (page 55 of the PDF) of the GLSL 1.50 spec:
4071 * "The type of init-expression in a switch statement must be a
4074 if (!test_expression
->type
->is_scalar() ||
4075 !test_expression
->type
->is_integer()) {
4076 YYLTYPE loc
= this->test_expression
->get_location();
4078 _mesa_glsl_error(& loc
,
4080 "switch-statement expression must be scalar "
4084 /* Track the switch-statement nesting in a stack-like manner.
4086 struct glsl_switch_state saved
= state
->switch_state
;
4088 state
->switch_state
.is_switch_innermost
= true;
4089 state
->switch_state
.switch_nesting_ast
= this;
4090 state
->switch_state
.labels_ht
= hash_table_ctor(0, hash_table_pointer_hash
,
4091 hash_table_pointer_compare
);
4092 state
->switch_state
.previous_default
= NULL
;
4094 /* Initalize is_fallthru state to false.
4096 ir_rvalue
*const is_fallthru_val
= new (ctx
) ir_constant(false);
4097 state
->switch_state
.is_fallthru_var
=
4098 new(ctx
) ir_variable(glsl_type::bool_type
,
4099 "switch_is_fallthru_tmp",
4101 instructions
->push_tail(state
->switch_state
.is_fallthru_var
);
4103 ir_dereference_variable
*deref_is_fallthru_var
=
4104 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
4105 instructions
->push_tail(new(ctx
) ir_assignment(deref_is_fallthru_var
,
4108 /* Initalize is_break state to false.
4110 ir_rvalue
*const is_break_val
= new (ctx
) ir_constant(false);
4111 state
->switch_state
.is_break_var
= new(ctx
) ir_variable(glsl_type::bool_type
,
4112 "switch_is_break_tmp",
4114 instructions
->push_tail(state
->switch_state
.is_break_var
);
4116 ir_dereference_variable
*deref_is_break_var
=
4117 new(ctx
) ir_dereference_variable(state
->switch_state
.is_break_var
);
4118 instructions
->push_tail(new(ctx
) ir_assignment(deref_is_break_var
,
4121 /* Cache test expression.
4123 test_to_hir(instructions
, state
);
4125 /* Emit code for body of switch stmt.
4127 body
->hir(instructions
, state
);
4129 hash_table_dtor(state
->switch_state
.labels_ht
);
4131 state
->switch_state
= saved
;
4133 /* Switch statements do not have r-values. */
4139 ast_switch_statement::test_to_hir(exec_list
*instructions
,
4140 struct _mesa_glsl_parse_state
*state
)
4144 /* Cache value of test expression. */
4145 ir_rvalue
*const test_val
=
4146 test_expression
->hir(instructions
,
4149 state
->switch_state
.test_var
= new(ctx
) ir_variable(test_val
->type
,
4152 ir_dereference_variable
*deref_test_var
=
4153 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
4155 instructions
->push_tail(state
->switch_state
.test_var
);
4156 instructions
->push_tail(new(ctx
) ir_assignment(deref_test_var
, test_val
));
4161 ast_switch_body::hir(exec_list
*instructions
,
4162 struct _mesa_glsl_parse_state
*state
)
4165 stmts
->hir(instructions
, state
);
4167 /* Switch bodies do not have r-values. */
4172 ast_case_statement_list::hir(exec_list
*instructions
,
4173 struct _mesa_glsl_parse_state
*state
)
4175 foreach_list_typed (ast_case_statement
, case_stmt
, link
, & this->cases
)
4176 case_stmt
->hir(instructions
, state
);
4178 /* Case statements do not have r-values. */
4183 ast_case_statement::hir(exec_list
*instructions
,
4184 struct _mesa_glsl_parse_state
*state
)
4186 labels
->hir(instructions
, state
);
4188 /* Conditionally set fallthru state based on break state. */
4189 ir_constant
*const false_val
= new(state
) ir_constant(false);
4190 ir_dereference_variable
*const deref_is_fallthru_var
=
4191 new(state
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
4192 ir_dereference_variable
*const deref_is_break_var
=
4193 new(state
) ir_dereference_variable(state
->switch_state
.is_break_var
);
4194 ir_assignment
*const reset_fallthru_on_break
=
4195 new(state
) ir_assignment(deref_is_fallthru_var
,
4197 deref_is_break_var
);
4198 instructions
->push_tail(reset_fallthru_on_break
);
4200 /* Guard case statements depending on fallthru state. */
4201 ir_dereference_variable
*const deref_fallthru_guard
=
4202 new(state
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
4203 ir_if
*const test_fallthru
= new(state
) ir_if(deref_fallthru_guard
);
4205 foreach_list_typed (ast_node
, stmt
, link
, & this->stmts
)
4206 stmt
->hir(& test_fallthru
->then_instructions
, state
);
4208 instructions
->push_tail(test_fallthru
);
4210 /* Case statements do not have r-values. */
4216 ast_case_label_list::hir(exec_list
*instructions
,
4217 struct _mesa_glsl_parse_state
*state
)
4219 foreach_list_typed (ast_case_label
, label
, link
, & this->labels
)
4220 label
->hir(instructions
, state
);
4222 /* Case labels do not have r-values. */
4227 ast_case_label::hir(exec_list
*instructions
,
4228 struct _mesa_glsl_parse_state
*state
)
4232 ir_dereference_variable
*deref_fallthru_var
=
4233 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
4235 ir_rvalue
*const true_val
= new(ctx
) ir_constant(true);
4237 /* If not default case, ... */
4238 if (this->test_value
!= NULL
) {
4239 /* Conditionally set fallthru state based on
4240 * comparison of cached test expression value to case label.
4242 ir_rvalue
*const label_rval
= this->test_value
->hir(instructions
, state
);
4243 ir_constant
*label_const
= label_rval
->constant_expression_value();
4246 YYLTYPE loc
= this->test_value
->get_location();
4248 _mesa_glsl_error(& loc
, state
,
4249 "switch statement case label must be a "
4250 "constant expression");
4252 /* Stuff a dummy value in to allow processing to continue. */
4253 label_const
= new(ctx
) ir_constant(0);
4255 ast_expression
*previous_label
= (ast_expression
*)
4256 hash_table_find(state
->switch_state
.labels_ht
,
4257 (void *)(uintptr_t)label_const
->value
.u
[0]);
4259 if (previous_label
) {
4260 YYLTYPE loc
= this->test_value
->get_location();
4261 _mesa_glsl_error(& loc
, state
,
4262 "duplicate case value");
4264 loc
= previous_label
->get_location();
4265 _mesa_glsl_error(& loc
, state
,
4266 "this is the previous case label");
4268 hash_table_insert(state
->switch_state
.labels_ht
,
4270 (void *)(uintptr_t)label_const
->value
.u
[0]);
4274 ir_dereference_variable
*deref_test_var
=
4275 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
4277 ir_rvalue
*const test_cond
= new(ctx
) ir_expression(ir_binop_all_equal
,
4281 ir_assignment
*set_fallthru_on_test
=
4282 new(ctx
) ir_assignment(deref_fallthru_var
,
4286 instructions
->push_tail(set_fallthru_on_test
);
4287 } else { /* default case */
4288 if (state
->switch_state
.previous_default
) {
4289 YYLTYPE loc
= this->get_location();
4290 _mesa_glsl_error(& loc
, state
,
4291 "multiple default labels in one switch");
4293 loc
= state
->switch_state
.previous_default
->get_location();
4294 _mesa_glsl_error(& loc
, state
,
4295 "this is the first default label");
4297 state
->switch_state
.previous_default
= this;
4299 /* Set falltrhu state. */
4300 ir_assignment
*set_fallthru
=
4301 new(ctx
) ir_assignment(deref_fallthru_var
, true_val
);
4303 instructions
->push_tail(set_fallthru
);
4306 /* Case statements do not have r-values. */
4311 ast_iteration_statement::condition_to_hir(ir_loop
*stmt
,
4312 struct _mesa_glsl_parse_state
*state
)
4316 if (condition
!= NULL
) {
4317 ir_rvalue
*const cond
=
4318 condition
->hir(& stmt
->body_instructions
, state
);
4321 || !cond
->type
->is_boolean() || !cond
->type
->is_scalar()) {
4322 YYLTYPE loc
= condition
->get_location();
4324 _mesa_glsl_error(& loc
, state
,
4325 "loop condition must be scalar boolean");
4327 /* As the first code in the loop body, generate a block that looks
4328 * like 'if (!condition) break;' as the loop termination condition.
4330 ir_rvalue
*const not_cond
=
4331 new(ctx
) ir_expression(ir_unop_logic_not
, cond
);
4333 ir_if
*const if_stmt
= new(ctx
) ir_if(not_cond
);
4335 ir_jump
*const break_stmt
=
4336 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
4338 if_stmt
->then_instructions
.push_tail(break_stmt
);
4339 stmt
->body_instructions
.push_tail(if_stmt
);
4346 ast_iteration_statement::hir(exec_list
*instructions
,
4347 struct _mesa_glsl_parse_state
*state
)
4351 /* For-loops and while-loops start a new scope, but do-while loops do not.
4353 if (mode
!= ast_do_while
)
4354 state
->symbols
->push_scope();
4356 if (init_statement
!= NULL
)
4357 init_statement
->hir(instructions
, state
);
4359 ir_loop
*const stmt
= new(ctx
) ir_loop();
4360 instructions
->push_tail(stmt
);
4362 /* Track the current loop nesting. */
4363 ast_iteration_statement
*nesting_ast
= state
->loop_nesting_ast
;
4365 state
->loop_nesting_ast
= this;
4367 /* Likewise, indicate that following code is closest to a loop,
4368 * NOT closest to a switch.
4370 bool saved_is_switch_innermost
= state
->switch_state
.is_switch_innermost
;
4371 state
->switch_state
.is_switch_innermost
= false;
4373 if (mode
!= ast_do_while
)
4374 condition_to_hir(stmt
, state
);
4377 body
->hir(& stmt
->body_instructions
, state
);
4379 if (rest_expression
!= NULL
)
4380 rest_expression
->hir(& stmt
->body_instructions
, state
);
4382 if (mode
== ast_do_while
)
4383 condition_to_hir(stmt
, state
);
4385 if (mode
!= ast_do_while
)
4386 state
->symbols
->pop_scope();
4388 /* Restore previous nesting before returning. */
4389 state
->loop_nesting_ast
= nesting_ast
;
4390 state
->switch_state
.is_switch_innermost
= saved_is_switch_innermost
;
4392 /* Loops do not have r-values.
4399 * Determine if the given type is valid for establishing a default precision
4402 * From GLSL ES 3.00 section 4.5.4 ("Default Precision Qualifiers"):
4404 * "The precision statement
4406 * precision precision-qualifier type;
4408 * can be used to establish a default precision qualifier. The type field
4409 * can be either int or float or any of the sampler types, and the
4410 * precision-qualifier can be lowp, mediump, or highp."
4412 * GLSL ES 1.00 has similar language. GLSL 1.30 doesn't allow precision
4413 * qualifiers on sampler types, but this seems like an oversight (since the
4414 * intention of including these in GLSL 1.30 is to allow compatibility with ES
4415 * shaders). So we allow int, float, and all sampler types regardless of GLSL
4419 is_valid_default_precision_type(const struct glsl_type
*const type
)
4424 switch (type
->base_type
) {
4426 case GLSL_TYPE_FLOAT
:
4427 /* "int" and "float" are valid, but vectors and matrices are not. */
4428 return type
->vector_elements
== 1 && type
->matrix_columns
== 1;
4429 case GLSL_TYPE_SAMPLER
:
4438 ast_type_specifier::hir(exec_list
*instructions
,
4439 struct _mesa_glsl_parse_state
*state
)
4441 if (this->default_precision
== ast_precision_none
&& this->structure
== NULL
)
4444 YYLTYPE loc
= this->get_location();
4446 /* If this is a precision statement, check that the type to which it is
4447 * applied is either float or int.
4449 * From section 4.5.3 of the GLSL 1.30 spec:
4450 * "The precision statement
4451 * precision precision-qualifier type;
4452 * can be used to establish a default precision qualifier. The type
4453 * field can be either int or float [...]. Any other types or
4454 * qualifiers will result in an error.
4456 if (this->default_precision
!= ast_precision_none
) {
4457 if (!state
->check_precision_qualifiers_allowed(&loc
))
4460 if (this->structure
!= NULL
) {
4461 _mesa_glsl_error(&loc
, state
,
4462 "precision qualifiers do not apply to structures");
4466 if (this->is_array
) {
4467 _mesa_glsl_error(&loc
, state
,
4468 "default precision statements do not apply to "
4473 const struct glsl_type
*const type
=
4474 state
->symbols
->get_type(this->type_name
);
4475 if (!is_valid_default_precision_type(type
)) {
4476 _mesa_glsl_error(&loc
, state
,
4477 "default precision statements apply only to "
4478 "float, int, and sampler types");
4482 if (type
->base_type
== GLSL_TYPE_FLOAT
4484 && state
->stage
== MESA_SHADER_FRAGMENT
) {
4485 /* Section 4.5.3 (Default Precision Qualifiers) of the GLSL ES 1.00
4488 * "The fragment language has no default precision qualifier for
4489 * floating point types."
4491 * As a result, we have to track whether or not default precision has
4492 * been specified for float in GLSL ES fragment shaders.
4494 * Earlier in that same section, the spec says:
4496 * "Non-precision qualified declarations will use the precision
4497 * qualifier specified in the most recent precision statement
4498 * that is still in scope. The precision statement has the same
4499 * scoping rules as variable declarations. If it is declared
4500 * inside a compound statement, its effect stops at the end of
4501 * the innermost statement it was declared in. Precision
4502 * statements in nested scopes override precision statements in
4503 * outer scopes. Multiple precision statements for the same basic
4504 * type can appear inside the same scope, with later statements
4505 * overriding earlier statements within that scope."
4507 * Default precision specifications follow the same scope rules as
4508 * variables. So, we can track the state of the default float
4509 * precision in the symbol table, and the rules will just work. This
4510 * is a slight abuse of the symbol table, but it has the semantics
4513 ir_variable
*const junk
=
4514 new(state
) ir_variable(type
, "#default precision",
4517 state
->symbols
->add_variable(junk
);
4520 /* FINISHME: Translate precision statements into IR. */
4524 /* _mesa_ast_set_aggregate_type() sets the <structure> field so that
4525 * process_record_constructor() can do type-checking on C-style initializer
4526 * expressions of structs, but ast_struct_specifier should only be translated
4527 * to HIR if it is declaring the type of a structure.
4529 * The ->is_declaration field is false for initializers of variables
4530 * declared separately from the struct's type definition.
4532 * struct S { ... }; (is_declaration = true)
4533 * struct T { ... } t = { ... }; (is_declaration = true)
4534 * S s = { ... }; (is_declaration = false)
4536 if (this->structure
!= NULL
&& this->structure
->is_declaration
)
4537 return this->structure
->hir(instructions
, state
);
4544 * Process a structure or interface block tree into an array of structure fields
4546 * After parsing, where there are some syntax differnces, structures and
4547 * interface blocks are almost identical. They are similar enough that the
4548 * AST for each can be processed the same way into a set of
4549 * \c glsl_struct_field to describe the members.
4551 * If we're processing an interface block, var_mode should be the type of the
4552 * interface block (ir_var_shader_in, ir_var_shader_out, or ir_var_uniform).
4553 * If we're processing a structure, var_mode should be ir_var_auto.
4556 * The number of fields processed. A pointer to the array structure fields is
4557 * stored in \c *fields_ret.
4560 ast_process_structure_or_interface_block(exec_list
*instructions
,
4561 struct _mesa_glsl_parse_state
*state
,
4562 exec_list
*declarations
,
4564 glsl_struct_field
**fields_ret
,
4566 bool block_row_major
,
4567 bool allow_reserved_names
,
4568 ir_variable_mode var_mode
)
4570 unsigned decl_count
= 0;
4572 /* Make an initial pass over the list of fields to determine how
4573 * many there are. Each element in this list is an ast_declarator_list.
4574 * This means that we actually need to count the number of elements in the
4575 * 'declarations' list in each of the elements.
4577 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
4578 foreach_list_const (decl_ptr
, & decl_list
->declarations
) {
4583 /* Allocate storage for the fields and process the field
4584 * declarations. As the declarations are processed, try to also convert
4585 * the types to HIR. This ensures that structure definitions embedded in
4586 * other structure definitions or in interface blocks are processed.
4588 glsl_struct_field
*const fields
= ralloc_array(state
, glsl_struct_field
,
4592 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
4593 const char *type_name
;
4595 decl_list
->type
->specifier
->hir(instructions
, state
);
4597 /* Section 10.9 of the GLSL ES 1.00 specification states that
4598 * embedded structure definitions have been removed from the language.
4600 if (state
->es_shader
&& decl_list
->type
->specifier
->structure
!= NULL
) {
4601 _mesa_glsl_error(&loc
, state
, "embedded structure definitions are "
4602 "not allowed in GLSL ES 1.00");
4605 const glsl_type
*decl_type
=
4606 decl_list
->type
->glsl_type(& type_name
, state
);
4608 foreach_list_typed (ast_declaration
, decl
, link
,
4609 &decl_list
->declarations
) {
4610 if (!allow_reserved_names
)
4611 validate_identifier(decl
->identifier
, loc
, state
);
4613 /* From the GL_ARB_uniform_buffer_object spec:
4615 * "Sampler types are not allowed inside of uniform
4616 * blocks. All other types, arrays, and structures
4617 * allowed for uniforms are allowed within a uniform
4620 * It should be impossible for decl_type to be NULL here. Cases that
4621 * might naturally lead to decl_type being NULL, especially for the
4622 * is_interface case, will have resulted in compilation having
4623 * already halted due to a syntax error.
4625 const struct glsl_type
*field_type
=
4626 decl_type
!= NULL
? decl_type
: glsl_type::error_type
;
4628 if (is_interface
&& field_type
->contains_sampler()) {
4629 YYLTYPE loc
= decl_list
->get_location();
4630 _mesa_glsl_error(&loc
, state
,
4631 "uniform in non-default uniform block contains sampler");
4634 if (field_type
->contains_atomic()) {
4635 /* FINISHME: Add a spec quotation here once updated spec
4636 * FINISHME: language is available. See Khronos bug #10903
4637 * FINISHME: on whether atomic counters are allowed in
4638 * FINISHME: structures.
4640 YYLTYPE loc
= decl_list
->get_location();
4641 _mesa_glsl_error(&loc
, state
, "atomic counter in structure or "
4645 const struct ast_type_qualifier
*const qual
=
4646 & decl_list
->type
->qualifier
;
4647 if (qual
->flags
.q
.std140
||
4648 qual
->flags
.q
.packed
||
4649 qual
->flags
.q
.shared
) {
4650 _mesa_glsl_error(&loc
, state
,
4651 "uniform block layout qualifiers std140, packed, and "
4652 "shared can only be applied to uniform blocks, not "
4656 if (decl
->is_array
) {
4657 field_type
= process_array_type(&loc
, decl_type
, decl
->array_size
,
4660 fields
[i
].type
= field_type
;
4661 fields
[i
].name
= decl
->identifier
;
4662 fields
[i
].location
= -1;
4663 fields
[i
].interpolation
=
4664 interpret_interpolation_qualifier(qual
, var_mode
, state
, &loc
);
4665 fields
[i
].centroid
= qual
->flags
.q
.centroid
? 1 : 0;
4666 fields
[i
].sample
= qual
->flags
.q
.sample
? 1 : 0;
4668 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
4669 if (!qual
->flags
.q
.uniform
) {
4670 _mesa_glsl_error(&loc
, state
,
4671 "row_major and column_major can only be "
4672 "applied to uniform interface blocks");
4674 validate_matrix_layout_for_type(state
, &loc
, field_type
, NULL
);
4677 if (qual
->flags
.q
.uniform
&& qual
->has_interpolation()) {
4678 _mesa_glsl_error(&loc
, state
,
4679 "interpolation qualifiers cannot be used "
4680 "with uniform interface blocks");
4683 if (field_type
->is_matrix() ||
4684 (field_type
->is_array() && field_type
->fields
.array
->is_matrix())) {
4685 fields
[i
].row_major
= block_row_major
;
4686 if (qual
->flags
.q
.row_major
)
4687 fields
[i
].row_major
= true;
4688 else if (qual
->flags
.q
.column_major
)
4689 fields
[i
].row_major
= false;
4696 assert(i
== decl_count
);
4698 *fields_ret
= fields
;
4704 ast_struct_specifier::hir(exec_list
*instructions
,
4705 struct _mesa_glsl_parse_state
*state
)
4707 YYLTYPE loc
= this->get_location();
4709 /* Section 4.1.8 (Structures) of the GLSL 1.10 spec says:
4711 * "Anonymous structures are not supported; so embedded structures must
4712 * have a declarator. A name given to an embedded struct is scoped at
4713 * the same level as the struct it is embedded in."
4715 * The same section of the GLSL 1.20 spec says:
4717 * "Anonymous structures are not supported. Embedded structures are not
4720 * struct S { float f; };
4722 * S; // Error: anonymous structures disallowed
4723 * struct { ... }; // Error: embedded structures disallowed
4724 * S s; // Okay: nested structures with name are allowed
4727 * The GLSL ES 1.00 and 3.00 specs have similar langauge and examples. So,
4728 * we allow embedded structures in 1.10 only.
4730 if (state
->language_version
!= 110 && state
->struct_specifier_depth
!= 0)
4731 _mesa_glsl_error(&loc
, state
,
4732 "embedded structure declartions are not allowed");
4734 state
->struct_specifier_depth
++;
4736 glsl_struct_field
*fields
;
4737 unsigned decl_count
=
4738 ast_process_structure_or_interface_block(instructions
,
4740 &this->declarations
,
4745 false /* allow_reserved_names */,
4748 validate_identifier(this->name
, loc
, state
);
4750 const glsl_type
*t
=
4751 glsl_type::get_record_instance(fields
, decl_count
, this->name
);
4753 if (!state
->symbols
->add_type(name
, t
)) {
4754 _mesa_glsl_error(& loc
, state
, "struct `%s' previously defined", name
);
4756 const glsl_type
**s
= reralloc(state
, state
->user_structures
,
4758 state
->num_user_structures
+ 1);
4760 s
[state
->num_user_structures
] = t
;
4761 state
->user_structures
= s
;
4762 state
->num_user_structures
++;
4766 state
->struct_specifier_depth
--;
4768 /* Structure type definitions do not have r-values.
4775 * Visitor class which detects whether a given interface block has been used.
4777 class interface_block_usage_visitor
: public ir_hierarchical_visitor
4780 interface_block_usage_visitor(ir_variable_mode mode
, const glsl_type
*block
)
4781 : mode(mode
), block(block
), found(false)
4785 virtual ir_visitor_status
visit(ir_dereference_variable
*ir
)
4787 if (ir
->var
->data
.mode
== mode
&& ir
->var
->get_interface_type() == block
) {
4791 return visit_continue
;
4794 bool usage_found() const
4800 ir_variable_mode mode
;
4801 const glsl_type
*block
;
4807 ast_interface_block::hir(exec_list
*instructions
,
4808 struct _mesa_glsl_parse_state
*state
)
4810 YYLTYPE loc
= this->get_location();
4812 /* The ast_interface_block has a list of ast_declarator_lists. We
4813 * need to turn those into ir_variables with an association
4814 * with this uniform block.
4816 enum glsl_interface_packing packing
;
4817 if (this->layout
.flags
.q
.shared
) {
4818 packing
= GLSL_INTERFACE_PACKING_SHARED
;
4819 } else if (this->layout
.flags
.q
.packed
) {
4820 packing
= GLSL_INTERFACE_PACKING_PACKED
;
4822 /* The default layout is std140.
4824 packing
= GLSL_INTERFACE_PACKING_STD140
;
4827 ir_variable_mode var_mode
;
4828 const char *iface_type_name
;
4829 if (this->layout
.flags
.q
.in
) {
4830 var_mode
= ir_var_shader_in
;
4831 iface_type_name
= "in";
4832 } else if (this->layout
.flags
.q
.out
) {
4833 var_mode
= ir_var_shader_out
;
4834 iface_type_name
= "out";
4835 } else if (this->layout
.flags
.q
.uniform
) {
4836 var_mode
= ir_var_uniform
;
4837 iface_type_name
= "uniform";
4839 var_mode
= ir_var_auto
;
4840 iface_type_name
= "UNKNOWN";
4841 assert(!"interface block layout qualifier not found!");
4844 bool redeclaring_per_vertex
= strcmp(this->block_name
, "gl_PerVertex") == 0;
4845 bool block_row_major
= this->layout
.flags
.q
.row_major
;
4846 exec_list declared_variables
;
4847 glsl_struct_field
*fields
;
4848 unsigned int num_variables
=
4849 ast_process_structure_or_interface_block(&declared_variables
,
4851 &this->declarations
,
4856 redeclaring_per_vertex
,
4859 if (!redeclaring_per_vertex
)
4860 validate_identifier(this->block_name
, loc
, state
);
4862 const glsl_type
*earlier_per_vertex
= NULL
;
4863 if (redeclaring_per_vertex
) {
4864 /* Find the previous declaration of gl_PerVertex. If we're redeclaring
4865 * the named interface block gl_in, we can find it by looking at the
4866 * previous declaration of gl_in. Otherwise we can find it by looking
4867 * at the previous decalartion of any of the built-in outputs,
4870 * Also check that the instance name and array-ness of the redeclaration
4874 case ir_var_shader_in
:
4875 if (ir_variable
*earlier_gl_in
=
4876 state
->symbols
->get_variable("gl_in")) {
4877 earlier_per_vertex
= earlier_gl_in
->get_interface_type();
4879 _mesa_glsl_error(&loc
, state
,
4880 "redeclaration of gl_PerVertex input not allowed "
4882 _mesa_shader_stage_to_string(state
->stage
));
4884 if (this->instance_name
== NULL
||
4885 strcmp(this->instance_name
, "gl_in") != 0 || !this->is_array
) {
4886 _mesa_glsl_error(&loc
, state
,
4887 "gl_PerVertex input must be redeclared as "
4891 case ir_var_shader_out
:
4892 if (ir_variable
*earlier_gl_Position
=
4893 state
->symbols
->get_variable("gl_Position")) {
4894 earlier_per_vertex
= earlier_gl_Position
->get_interface_type();
4896 _mesa_glsl_error(&loc
, state
,
4897 "redeclaration of gl_PerVertex output not "
4898 "allowed in the %s shader",
4899 _mesa_shader_stage_to_string(state
->stage
));
4901 if (this->instance_name
!= NULL
) {
4902 _mesa_glsl_error(&loc
, state
,
4903 "gl_PerVertex input may not be redeclared with "
4904 "an instance name");
4908 _mesa_glsl_error(&loc
, state
,
4909 "gl_PerVertex must be declared as an input or an "
4914 if (earlier_per_vertex
== NULL
) {
4915 /* An error has already been reported. Bail out to avoid null
4916 * dereferences later in this function.
4921 /* Copy locations from the old gl_PerVertex interface block. */
4922 for (unsigned i
= 0; i
< num_variables
; i
++) {
4923 int j
= earlier_per_vertex
->field_index(fields
[i
].name
);
4925 _mesa_glsl_error(&loc
, state
,
4926 "redeclaration of gl_PerVertex must be a subset "
4927 "of the built-in members of gl_PerVertex");
4929 fields
[i
].location
=
4930 earlier_per_vertex
->fields
.structure
[j
].location
;
4931 fields
[i
].interpolation
=
4932 earlier_per_vertex
->fields
.structure
[j
].interpolation
;
4933 fields
[i
].centroid
=
4934 earlier_per_vertex
->fields
.structure
[j
].centroid
;
4936 earlier_per_vertex
->fields
.structure
[j
].sample
;
4940 /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10
4943 * If a built-in interface block is redeclared, it must appear in
4944 * the shader before any use of any member included in the built-in
4945 * declaration, or a compilation error will result.
4947 * This appears to be a clarification to the behaviour established for
4948 * gl_PerVertex by GLSL 1.50, therefore we implement this behaviour
4949 * regardless of GLSL version.
4951 interface_block_usage_visitor
v(var_mode
, earlier_per_vertex
);
4952 v
.run(instructions
);
4953 if (v
.usage_found()) {
4954 _mesa_glsl_error(&loc
, state
,
4955 "redeclaration of a built-in interface block must "
4956 "appear before any use of any member of the "
4961 const glsl_type
*block_type
=
4962 glsl_type::get_interface_instance(fields
,
4967 if (!state
->symbols
->add_interface(block_type
->name
, block_type
, var_mode
)) {
4968 YYLTYPE loc
= this->get_location();
4969 _mesa_glsl_error(&loc
, state
, "interface block `%s' with type `%s' "
4970 "already taken in the current scope",
4971 this->block_name
, iface_type_name
);
4974 /* Since interface blocks cannot contain statements, it should be
4975 * impossible for the block to generate any instructions.
4977 assert(declared_variables
.is_empty());
4979 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
4981 * Geometry shader input variables get the per-vertex values written
4982 * out by vertex shader output variables of the same names. Since a
4983 * geometry shader operates on a set of vertices, each input varying
4984 * variable (or input block, see interface blocks below) needs to be
4985 * declared as an array.
4987 if (state
->stage
== MESA_SHADER_GEOMETRY
&& !this->is_array
&&
4988 var_mode
== ir_var_shader_in
) {
4989 _mesa_glsl_error(&loc
, state
, "geometry shader inputs must be arrays");
4992 /* Page 39 (page 45 of the PDF) of section 4.3.7 in the GLSL ES 3.00 spec
4995 * "If an instance name (instance-name) is used, then it puts all the
4996 * members inside a scope within its own name space, accessed with the
4997 * field selector ( . ) operator (analogously to structures)."
4999 if (this->instance_name
) {
5000 if (redeclaring_per_vertex
) {
5001 /* When a built-in in an unnamed interface block is redeclared,
5002 * get_variable_being_redeclared() calls
5003 * check_builtin_array_max_size() to make sure that built-in array
5004 * variables aren't redeclared to illegal sizes. But we're looking
5005 * at a redeclaration of a named built-in interface block. So we
5006 * have to manually call check_builtin_array_max_size() for all parts
5007 * of the interface that are arrays.
5009 for (unsigned i
= 0; i
< num_variables
; i
++) {
5010 if (fields
[i
].type
->is_array()) {
5011 const unsigned size
= fields
[i
].type
->array_size();
5012 check_builtin_array_max_size(fields
[i
].name
, size
, loc
, state
);
5016 validate_identifier(this->instance_name
, loc
, state
);
5021 if (this->is_array
) {
5022 /* Section 4.3.7 (Interface Blocks) of the GLSL 1.50 spec says:
5024 * For uniform blocks declared an array, each individual array
5025 * element corresponds to a separate buffer object backing one
5026 * instance of the block. As the array size indicates the number
5027 * of buffer objects needed, uniform block array declarations
5028 * must specify an array size.
5030 * And a few paragraphs later:
5032 * Geometry shader input blocks must be declared as arrays and
5033 * follow the array declaration and linking rules for all
5034 * geometry shader inputs. All other input and output block
5035 * arrays must specify an array size.
5037 * The upshot of this is that the only circumstance where an
5038 * interface array size *doesn't* need to be specified is on a
5039 * geometry shader input.
5041 if (this->array_size
== NULL
&&
5042 (state
->stage
!= MESA_SHADER_GEOMETRY
|| !this->layout
.flags
.q
.in
)) {
5043 _mesa_glsl_error(&loc
, state
,
5044 "only geometry shader inputs may be unsized "
5045 "instance block arrays");
5049 const glsl_type
*block_array_type
=
5050 process_array_type(&loc
, block_type
, this->array_size
, state
);
5052 var
= new(state
) ir_variable(block_array_type
,
5053 this->instance_name
,
5056 var
= new(state
) ir_variable(block_type
,
5057 this->instance_name
,
5061 if (state
->stage
== MESA_SHADER_GEOMETRY
&& var_mode
== ir_var_shader_in
)
5062 handle_geometry_shader_input_decl(state
, loc
, var
);
5064 if (ir_variable
*earlier
=
5065 state
->symbols
->get_variable(this->instance_name
)) {
5066 if (!redeclaring_per_vertex
) {
5067 _mesa_glsl_error(&loc
, state
, "`%s' redeclared",
5068 this->instance_name
);
5070 earlier
->data
.how_declared
= ir_var_declared_normally
;
5071 earlier
->type
= var
->type
;
5072 earlier
->reinit_interface_type(block_type
);
5075 state
->symbols
->add_variable(var
);
5076 instructions
->push_tail(var
);
5079 /* In order to have an array size, the block must also be declared with
5082 assert(!this->is_array
);
5084 for (unsigned i
= 0; i
< num_variables
; i
++) {
5086 new(state
) ir_variable(fields
[i
].type
,
5087 ralloc_strdup(state
, fields
[i
].name
),
5089 var
->data
.interpolation
= fields
[i
].interpolation
;
5090 var
->data
.centroid
= fields
[i
].centroid
;
5091 var
->data
.sample
= fields
[i
].sample
;
5092 var
->init_interface_type(block_type
);
5094 if (redeclaring_per_vertex
) {
5095 ir_variable
*earlier
=
5096 get_variable_being_redeclared(var
, loc
, state
,
5097 true /* allow_all_redeclarations */);
5098 if (strncmp(var
->name
, "gl_", 3) != 0 || earlier
== NULL
) {
5099 _mesa_glsl_error(&loc
, state
,
5100 "redeclaration of gl_PerVertex can only "
5101 "include built-in variables");
5102 } else if (earlier
->data
.how_declared
== ir_var_declared_normally
) {
5103 _mesa_glsl_error(&loc
, state
,
5104 "`%s' has already been redeclared", var
->name
);
5106 earlier
->data
.how_declared
= ir_var_declared_in_block
;
5107 earlier
->reinit_interface_type(block_type
);
5112 if (state
->symbols
->get_variable(var
->name
) != NULL
)
5113 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", var
->name
);
5115 /* Propagate the "binding" keyword into this UBO's fields;
5116 * the UBO declaration itself doesn't get an ir_variable unless it
5117 * has an instance name. This is ugly.
5119 var
->data
.explicit_binding
= this->layout
.flags
.q
.explicit_binding
;
5120 var
->data
.binding
= this->layout
.binding
;
5122 state
->symbols
->add_variable(var
);
5123 instructions
->push_tail(var
);
5126 if (redeclaring_per_vertex
&& block_type
!= earlier_per_vertex
) {
5127 /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10 spec:
5129 * It is also a compilation error ... to redeclare a built-in
5130 * block and then use a member from that built-in block that was
5131 * not included in the redeclaration.
5133 * This appears to be a clarification to the behaviour established
5134 * for gl_PerVertex by GLSL 1.50, therefore we implement this
5135 * behaviour regardless of GLSL version.
5137 * To prevent the shader from using a member that was not included in
5138 * the redeclaration, we disable any ir_variables that are still
5139 * associated with the old declaration of gl_PerVertex (since we've
5140 * already updated all of the variables contained in the new
5141 * gl_PerVertex to point to it).
5143 * As a side effect this will prevent
5144 * validate_intrastage_interface_blocks() from getting confused and
5145 * thinking there are conflicting definitions of gl_PerVertex in the
5148 foreach_list_safe(node
, instructions
) {
5149 ir_variable
*const var
= ((ir_instruction
*) node
)->as_variable();
5151 var
->get_interface_type() == earlier_per_vertex
&&
5152 var
->data
.mode
== var_mode
) {
5153 if (var
->data
.how_declared
== ir_var_declared_normally
) {
5154 _mesa_glsl_error(&loc
, state
,
5155 "redeclaration of gl_PerVertex cannot "
5156 "follow a redeclaration of `%s'",
5159 state
->symbols
->disable_variable(var
->name
);
5171 ast_gs_input_layout::hir(exec_list
*instructions
,
5172 struct _mesa_glsl_parse_state
*state
)
5174 YYLTYPE loc
= this->get_location();
5176 /* If any geometry input layout declaration preceded this one, make sure it
5177 * was consistent with this one.
5179 if (state
->gs_input_prim_type_specified
&&
5180 state
->gs_input_prim_type
!= this->prim_type
) {
5181 _mesa_glsl_error(&loc
, state
,
5182 "geometry shader input layout does not match"
5183 " previous declaration");
5187 /* If any shader inputs occurred before this declaration and specified an
5188 * array size, make sure the size they specified is consistent with the
5191 unsigned num_vertices
= vertices_per_prim(this->prim_type
);
5192 if (state
->gs_input_size
!= 0 && state
->gs_input_size
!= num_vertices
) {
5193 _mesa_glsl_error(&loc
, state
,
5194 "this geometry shader input layout implies %u vertices"
5195 " per primitive, but a previous input is declared"
5196 " with size %u", num_vertices
, state
->gs_input_size
);
5200 state
->gs_input_prim_type_specified
= true;
5201 state
->gs_input_prim_type
= this->prim_type
;
5203 /* If any shader inputs occurred before this declaration and did not
5204 * specify an array size, their size is determined now.
5206 foreach_list (node
, instructions
) {
5207 ir_variable
*var
= ((ir_instruction
*) node
)->as_variable();
5208 if (var
== NULL
|| var
->data
.mode
!= ir_var_shader_in
)
5211 /* Note: gl_PrimitiveIDIn has mode ir_var_shader_in, but it's not an
5215 if (var
->type
->is_unsized_array()) {
5216 if (var
->data
.max_array_access
>= num_vertices
) {
5217 _mesa_glsl_error(&loc
, state
,
5218 "this geometry shader input layout implies %u"
5219 " vertices, but an access to element %u of input"
5220 " `%s' already exists", num_vertices
,
5221 var
->data
.max_array_access
, var
->name
);
5223 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
5234 detect_conflicting_assignments(struct _mesa_glsl_parse_state
*state
,
5235 exec_list
*instructions
)
5237 bool gl_FragColor_assigned
= false;
5238 bool gl_FragData_assigned
= false;
5239 bool user_defined_fs_output_assigned
= false;
5240 ir_variable
*user_defined_fs_output
= NULL
;
5242 /* It would be nice to have proper location information. */
5244 memset(&loc
, 0, sizeof(loc
));
5246 foreach_list(node
, instructions
) {
5247 ir_variable
*var
= ((ir_instruction
*)node
)->as_variable();
5249 if (!var
|| !var
->data
.assigned
)
5252 if (strcmp(var
->name
, "gl_FragColor") == 0)
5253 gl_FragColor_assigned
= true;
5254 else if (strcmp(var
->name
, "gl_FragData") == 0)
5255 gl_FragData_assigned
= true;
5256 else if (strncmp(var
->name
, "gl_", 3) != 0) {
5257 if (state
->stage
== MESA_SHADER_FRAGMENT
&&
5258 var
->data
.mode
== ir_var_shader_out
) {
5259 user_defined_fs_output_assigned
= true;
5260 user_defined_fs_output
= var
;
5265 /* From the GLSL 1.30 spec:
5267 * "If a shader statically assigns a value to gl_FragColor, it
5268 * may not assign a value to any element of gl_FragData. If a
5269 * shader statically writes a value to any element of
5270 * gl_FragData, it may not assign a value to
5271 * gl_FragColor. That is, a shader may assign values to either
5272 * gl_FragColor or gl_FragData, but not both. Multiple shaders
5273 * linked together must also consistently write just one of
5274 * these variables. Similarly, if user declared output
5275 * variables are in use (statically assigned to), then the
5276 * built-in variables gl_FragColor and gl_FragData may not be
5277 * assigned to. These incorrect usages all generate compile
5280 if (gl_FragColor_assigned
&& gl_FragData_assigned
) {
5281 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
5282 "`gl_FragColor' and `gl_FragData'");
5283 } else if (gl_FragColor_assigned
&& user_defined_fs_output_assigned
) {
5284 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
5285 "`gl_FragColor' and `%s'",
5286 user_defined_fs_output
->name
);
5287 } else if (gl_FragData_assigned
&& user_defined_fs_output_assigned
) {
5288 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
5289 "`gl_FragData' and `%s'",
5290 user_defined_fs_output
->name
);
5296 remove_per_vertex_blocks(exec_list
*instructions
,
5297 _mesa_glsl_parse_state
*state
, ir_variable_mode mode
)
5299 /* Find the gl_PerVertex interface block of the appropriate (in/out) mode,
5300 * if it exists in this shader type.
5302 const glsl_type
*per_vertex
= NULL
;
5304 case ir_var_shader_in
:
5305 if (ir_variable
*gl_in
= state
->symbols
->get_variable("gl_in"))
5306 per_vertex
= gl_in
->get_interface_type();
5308 case ir_var_shader_out
:
5309 if (ir_variable
*gl_Position
=
5310 state
->symbols
->get_variable("gl_Position")) {
5311 per_vertex
= gl_Position
->get_interface_type();
5315 assert(!"Unexpected mode");
5319 /* If we didn't find a built-in gl_PerVertex interface block, then we don't
5320 * need to do anything.
5322 if (per_vertex
== NULL
)
5325 /* If the interface block is used by the shader, then we don't need to do
5328 interface_block_usage_visitor
v(mode
, per_vertex
);
5329 v
.run(instructions
);
5330 if (v
.usage_found())
5333 /* Remove any ir_variable declarations that refer to the interface block
5336 foreach_list_safe(node
, instructions
) {
5337 ir_variable
*const var
= ((ir_instruction
*) node
)->as_variable();
5338 if (var
!= NULL
&& var
->get_interface_type() == per_vertex
&&
5339 var
->data
.mode
== mode
) {
5340 state
->symbols
->disable_variable(var
->name
);