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 "glsl_symbol_table.h"
53 #include "glsl_parser_extras.h"
55 #include "compiler/glsl_types.h"
56 #include "util/hash_table.h"
57 #include "main/mtypes.h"
58 #include "main/macros.h"
59 #include "main/shaderobj.h"
61 #include "ir_builder.h"
62 #include "builtin_functions.h"
64 using namespace ir_builder
;
67 detect_conflicting_assignments(struct _mesa_glsl_parse_state
*state
,
68 exec_list
*instructions
);
70 verify_subroutine_associated_funcs(struct _mesa_glsl_parse_state
*state
);
73 remove_per_vertex_blocks(exec_list
*instructions
,
74 _mesa_glsl_parse_state
*state
, ir_variable_mode mode
);
77 * Visitor class that finds the first instance of any write-only variable that
78 * is ever read, if any
80 class read_from_write_only_variable_visitor
: public ir_hierarchical_visitor
83 read_from_write_only_variable_visitor() : found(NULL
)
87 virtual ir_visitor_status
visit(ir_dereference_variable
*ir
)
89 if (this->in_assignee
)
90 return visit_continue
;
92 ir_variable
*var
= ir
->variable_referenced();
93 /* We can have memory_write_only set on both images and buffer variables,
94 * but in the former there is a distinction between reads from
95 * the variable itself (write_only) and from the memory they point to
96 * (memory_write_only), while in the case of buffer variables there is
97 * no such distinction, that is why this check here is limited to
98 * buffer variables alone.
100 if (!var
|| var
->data
.mode
!= ir_var_shader_storage
)
101 return visit_continue
;
103 if (var
->data
.memory_write_only
) {
108 return visit_continue
;
111 ir_variable
*get_variable() {
115 virtual ir_visitor_status
visit_enter(ir_expression
*ir
)
117 /* .length() doesn't actually read anything */
118 if (ir
->operation
== ir_unop_ssbo_unsized_array_length
)
119 return visit_continue_with_parent
;
121 return visit_continue
;
129 _mesa_ast_to_hir(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
)
131 _mesa_glsl_initialize_variables(instructions
, state
);
133 state
->symbols
->separate_function_namespace
= state
->language_version
== 110;
135 state
->current_function
= NULL
;
137 state
->toplevel_ir
= instructions
;
139 state
->gs_input_prim_type_specified
= false;
140 state
->tcs_output_vertices_specified
= false;
141 state
->cs_input_local_size_specified
= false;
143 /* Section 4.2 of the GLSL 1.20 specification states:
144 * "The built-in functions are scoped in a scope outside the global scope
145 * users declare global variables in. That is, a shader's global scope,
146 * available for user-defined functions and global variables, is nested
147 * inside the scope containing the built-in functions."
149 * Since built-in functions like ftransform() access built-in variables,
150 * it follows that those must be in the outer scope as well.
152 * We push scope here to create this nesting effect...but don't pop.
153 * This way, a shader's globals are still in the symbol table for use
156 state
->symbols
->push_scope();
158 foreach_list_typed (ast_node
, ast
, link
, & state
->translation_unit
)
159 ast
->hir(instructions
, state
);
161 verify_subroutine_associated_funcs(state
);
162 detect_recursion_unlinked(state
, instructions
);
163 detect_conflicting_assignments(state
, instructions
);
165 state
->toplevel_ir
= NULL
;
167 /* Move all of the variable declarations to the front of the IR list, and
168 * reverse the order. This has the (intended!) side effect that vertex
169 * shader inputs and fragment shader outputs will appear in the IR in the
170 * same order that they appeared in the shader code. This results in the
171 * locations being assigned in the declared order. Many (arguably buggy)
172 * applications depend on this behavior, and it matches what nearly all
175 foreach_in_list_safe(ir_instruction
, node
, instructions
) {
176 ir_variable
*const var
= node
->as_variable();
182 instructions
->push_head(var
);
185 /* Figure out if gl_FragCoord is actually used in fragment shader */
186 ir_variable
*const var
= state
->symbols
->get_variable("gl_FragCoord");
188 state
->fs_uses_gl_fragcoord
= var
->data
.used
;
190 /* From section 7.1 (Built-In Language Variables) of the GLSL 4.10 spec:
192 * If multiple shaders using members of a built-in block belonging to
193 * the same interface are linked together in the same program, they
194 * must all redeclare the built-in block in the same way, as described
195 * in section 4.3.7 "Interface Blocks" for interface block matching, or
196 * a link error will result.
198 * The phrase "using members of a built-in block" implies that if two
199 * shaders are linked together and one of them *does not use* any members
200 * of the built-in block, then that shader does not need to have a matching
201 * redeclaration of the built-in block.
203 * This appears to be a clarification to the behaviour established for
204 * gl_PerVertex by GLSL 1.50, therefore implement it regardless of GLSL
207 * The definition of "interface" in section 4.3.7 that applies here is as
210 * The boundary between adjacent programmable pipeline stages: This
211 * spans all the outputs in all compilation units of the first stage
212 * and all the inputs in all compilation units of the second stage.
214 * Therefore this rule applies to both inter- and intra-stage linking.
216 * The easiest way to implement this is to check whether the shader uses
217 * gl_PerVertex right after ast-to-ir conversion, and if it doesn't, simply
218 * remove all the relevant variable declaration from the IR, so that the
219 * linker won't see them and complain about mismatches.
221 remove_per_vertex_blocks(instructions
, state
, ir_var_shader_in
);
222 remove_per_vertex_blocks(instructions
, state
, ir_var_shader_out
);
224 /* Check that we don't have reads from write-only variables */
225 read_from_write_only_variable_visitor v
;
227 ir_variable
*error_var
= v
.get_variable();
229 /* It would be nice to have proper location information, but for that
230 * we would need to check this as we process each kind of AST node
233 memset(&loc
, 0, sizeof(loc
));
234 _mesa_glsl_error(&loc
, state
, "Read from write-only variable `%s'",
240 static ir_expression_operation
241 get_implicit_conversion_operation(const glsl_type
*to
, const glsl_type
*from
,
242 struct _mesa_glsl_parse_state
*state
)
244 switch (to
->base_type
) {
245 case GLSL_TYPE_FLOAT
:
246 switch (from
->base_type
) {
247 case GLSL_TYPE_INT
: return ir_unop_i2f
;
248 case GLSL_TYPE_UINT
: return ir_unop_u2f
;
249 default: return (ir_expression_operation
)0;
253 if (!state
->has_implicit_uint_to_int_conversion())
254 return (ir_expression_operation
)0;
255 switch (from
->base_type
) {
256 case GLSL_TYPE_INT
: return ir_unop_i2u
;
257 default: return (ir_expression_operation
)0;
260 case GLSL_TYPE_DOUBLE
:
261 if (!state
->has_double())
262 return (ir_expression_operation
)0;
263 switch (from
->base_type
) {
264 case GLSL_TYPE_INT
: return ir_unop_i2d
;
265 case GLSL_TYPE_UINT
: return ir_unop_u2d
;
266 case GLSL_TYPE_FLOAT
: return ir_unop_f2d
;
267 case GLSL_TYPE_INT64
: return ir_unop_i642d
;
268 case GLSL_TYPE_UINT64
: return ir_unop_u642d
;
269 default: return (ir_expression_operation
)0;
272 case GLSL_TYPE_UINT64
:
273 if (!state
->has_int64())
274 return (ir_expression_operation
)0;
275 switch (from
->base_type
) {
276 case GLSL_TYPE_INT
: return ir_unop_i2u64
;
277 case GLSL_TYPE_UINT
: return ir_unop_u2u64
;
278 case GLSL_TYPE_INT64
: return ir_unop_i642u64
;
279 default: return (ir_expression_operation
)0;
282 case GLSL_TYPE_INT64
:
283 if (!state
->has_int64())
284 return (ir_expression_operation
)0;
285 switch (from
->base_type
) {
286 case GLSL_TYPE_INT
: return ir_unop_i2i64
;
287 default: return (ir_expression_operation
)0;
290 default: return (ir_expression_operation
)0;
296 * If a conversion is available, convert one operand to a different type
298 * The \c from \c ir_rvalue is converted "in place".
300 * \param to Type that the operand it to be converted to
301 * \param from Operand that is being converted
302 * \param state GLSL compiler state
305 * If a conversion is possible (or unnecessary), \c true is returned.
306 * Otherwise \c false is returned.
309 apply_implicit_conversion(const glsl_type
*to
, ir_rvalue
* &from
,
310 struct _mesa_glsl_parse_state
*state
)
313 if (to
->base_type
== from
->type
->base_type
)
316 /* Prior to GLSL 1.20, there are no implicit conversions */
317 if (!state
->has_implicit_conversions())
320 /* From page 27 (page 33 of the PDF) of the GLSL 1.50 spec:
322 * "There are no implicit array or structure conversions. For
323 * example, an array of int cannot be implicitly converted to an
326 if (!to
->is_numeric() || !from
->type
->is_numeric())
329 /* We don't actually want the specific type `to`, we want a type
330 * with the same base type as `to`, but the same vector width as
333 to
= glsl_type::get_instance(to
->base_type
, from
->type
->vector_elements
,
334 from
->type
->matrix_columns
);
336 ir_expression_operation op
= get_implicit_conversion_operation(to
, from
->type
, state
);
338 from
= new(ctx
) ir_expression(op
, to
, from
, NULL
);
346 static const struct glsl_type
*
347 arithmetic_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
349 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
351 const glsl_type
*type_a
= value_a
->type
;
352 const glsl_type
*type_b
= value_b
->type
;
354 /* From GLSL 1.50 spec, page 56:
356 * "The arithmetic binary operators add (+), subtract (-),
357 * multiply (*), and divide (/) operate on integer and
358 * floating-point scalars, vectors, and matrices."
360 if (!type_a
->is_numeric() || !type_b
->is_numeric()) {
361 _mesa_glsl_error(loc
, state
,
362 "operands to arithmetic operators must be numeric");
363 return glsl_type::error_type
;
367 /* "If one operand is floating-point based and the other is
368 * not, then the conversions from Section 4.1.10 "Implicit
369 * Conversions" are applied to the non-floating-point-based operand."
371 if (!apply_implicit_conversion(type_a
, value_b
, state
)
372 && !apply_implicit_conversion(type_b
, value_a
, state
)) {
373 _mesa_glsl_error(loc
, state
,
374 "could not implicitly convert operands to "
375 "arithmetic operator");
376 return glsl_type::error_type
;
378 type_a
= value_a
->type
;
379 type_b
= value_b
->type
;
381 /* "If the operands are integer types, they must both be signed or
384 * From this rule and the preceeding conversion it can be inferred that
385 * both types must be GLSL_TYPE_FLOAT, or GLSL_TYPE_UINT, or GLSL_TYPE_INT.
386 * The is_numeric check above already filtered out the case where either
387 * type is not one of these, so now the base types need only be tested for
390 if (type_a
->base_type
!= type_b
->base_type
) {
391 _mesa_glsl_error(loc
, state
,
392 "base type mismatch for arithmetic operator");
393 return glsl_type::error_type
;
396 /* "All arithmetic binary operators result in the same fundamental type
397 * (signed integer, unsigned integer, or floating-point) as the
398 * operands they operate on, after operand type conversion. After
399 * conversion, the following cases are valid
401 * * The two operands are scalars. In this case the operation is
402 * applied, resulting in a scalar."
404 if (type_a
->is_scalar() && type_b
->is_scalar())
407 /* "* One operand is a scalar, and the other is a vector or matrix.
408 * In this case, the scalar operation is applied independently to each
409 * component of the vector or matrix, resulting in the same size
412 if (type_a
->is_scalar()) {
413 if (!type_b
->is_scalar())
415 } else if (type_b
->is_scalar()) {
419 /* All of the combinations of <scalar, scalar>, <vector, scalar>,
420 * <scalar, vector>, <scalar, matrix>, and <matrix, scalar> have been
423 assert(!type_a
->is_scalar());
424 assert(!type_b
->is_scalar());
426 /* "* The two operands are vectors of the same size. In this case, the
427 * operation is done component-wise resulting in the same size
430 if (type_a
->is_vector() && type_b
->is_vector()) {
431 if (type_a
== type_b
) {
434 _mesa_glsl_error(loc
, state
,
435 "vector size mismatch for arithmetic operator");
436 return glsl_type::error_type
;
440 /* All of the combinations of <scalar, scalar>, <vector, scalar>,
441 * <scalar, vector>, <scalar, matrix>, <matrix, scalar>, and
442 * <vector, vector> have been handled. At least one of the operands must
443 * be matrix. Further, since there are no integer matrix types, the base
444 * type of both operands must be float.
446 assert(type_a
->is_matrix() || type_b
->is_matrix());
447 assert(type_a
->is_float() || type_a
->is_double());
448 assert(type_b
->is_float() || type_b
->is_double());
450 /* "* The operator is add (+), subtract (-), or divide (/), and the
451 * operands are matrices with the same number of rows and the same
452 * number of columns. In this case, the operation is done component-
453 * wise resulting in the same size matrix."
454 * * The operator is multiply (*), where both operands are matrices or
455 * one operand is a vector and the other a matrix. A right vector
456 * operand is treated as a column vector and a left vector operand as a
457 * row vector. In all these cases, it is required that the number of
458 * columns of the left operand is equal to the number of rows of the
459 * right operand. Then, the multiply (*) operation does a linear
460 * algebraic multiply, yielding an object that has the same number of
461 * rows as the left operand and the same number of columns as the right
462 * operand. Section 5.10 "Vector and Matrix Operations" explains in
463 * more detail how vectors and matrices are operated on."
466 if (type_a
== type_b
)
469 const glsl_type
*type
= glsl_type::get_mul_type(type_a
, type_b
);
471 if (type
== glsl_type::error_type
) {
472 _mesa_glsl_error(loc
, state
,
473 "size mismatch for matrix multiplication");
480 /* "All other cases are illegal."
482 _mesa_glsl_error(loc
, state
, "type mismatch");
483 return glsl_type::error_type
;
487 static const struct glsl_type
*
488 unary_arithmetic_result_type(const struct glsl_type
*type
,
489 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
491 /* From GLSL 1.50 spec, page 57:
493 * "The arithmetic unary operators negate (-), post- and pre-increment
494 * and decrement (-- and ++) operate on integer or floating-point
495 * values (including vectors and matrices). All unary operators work
496 * component-wise on their operands. These result with the same type
499 if (!type
->is_numeric()) {
500 _mesa_glsl_error(loc
, state
,
501 "operands to arithmetic operators must be numeric");
502 return glsl_type::error_type
;
509 * \brief Return the result type of a bit-logic operation.
511 * If the given types to the bit-logic operator are invalid, return
512 * glsl_type::error_type.
514 * \param value_a LHS of bit-logic op
515 * \param value_b RHS of bit-logic op
517 static const struct glsl_type
*
518 bit_logic_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
520 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
522 const glsl_type
*type_a
= value_a
->type
;
523 const glsl_type
*type_b
= value_b
->type
;
525 if (!state
->check_bitwise_operations_allowed(loc
)) {
526 return glsl_type::error_type
;
529 /* From page 50 (page 56 of PDF) of GLSL 1.30 spec:
531 * "The bitwise operators and (&), exclusive-or (^), and inclusive-or
532 * (|). The operands must be of type signed or unsigned integers or
535 if (!type_a
->is_integer_32_64()) {
536 _mesa_glsl_error(loc
, state
, "LHS of `%s' must be an integer",
537 ast_expression::operator_string(op
));
538 return glsl_type::error_type
;
540 if (!type_b
->is_integer_32_64()) {
541 _mesa_glsl_error(loc
, state
, "RHS of `%s' must be an integer",
542 ast_expression::operator_string(op
));
543 return glsl_type::error_type
;
546 /* Prior to GLSL 4.0 / GL_ARB_gpu_shader5, implicit conversions didn't
547 * make sense for bitwise operations, as they don't operate on floats.
549 * GLSL 4.0 added implicit int -> uint conversions, which are relevant
550 * here. It wasn't clear whether or not we should apply them to bitwise
551 * operations. However, Khronos has decided that they should in future
552 * language revisions. Applications also rely on this behavior. We opt
553 * to apply them in general, but issue a portability warning.
555 * See https://www.khronos.org/bugzilla/show_bug.cgi?id=1405
557 if (type_a
->base_type
!= type_b
->base_type
) {
558 if (!apply_implicit_conversion(type_a
, value_b
, state
)
559 && !apply_implicit_conversion(type_b
, value_a
, state
)) {
560 _mesa_glsl_error(loc
, state
,
561 "could not implicitly convert operands to "
563 ast_expression::operator_string(op
));
564 return glsl_type::error_type
;
566 _mesa_glsl_warning(loc
, state
,
567 "some implementations may not support implicit "
568 "int -> uint conversions for `%s' operators; "
569 "consider casting explicitly for portability",
570 ast_expression::operator_string(op
));
572 type_a
= value_a
->type
;
573 type_b
= value_b
->type
;
576 /* "The fundamental types of the operands (signed or unsigned) must
579 if (type_a
->base_type
!= type_b
->base_type
) {
580 _mesa_glsl_error(loc
, state
, "operands of `%s' must have the same "
581 "base type", ast_expression::operator_string(op
));
582 return glsl_type::error_type
;
585 /* "The operands cannot be vectors of differing size." */
586 if (type_a
->is_vector() &&
587 type_b
->is_vector() &&
588 type_a
->vector_elements
!= type_b
->vector_elements
) {
589 _mesa_glsl_error(loc
, state
, "operands of `%s' cannot be vectors of "
590 "different sizes", ast_expression::operator_string(op
));
591 return glsl_type::error_type
;
594 /* "If one operand is a scalar and the other a vector, the scalar is
595 * applied component-wise to the vector, resulting in the same type as
596 * the vector. The fundamental types of the operands [...] will be the
597 * resulting fundamental type."
599 if (type_a
->is_scalar())
605 static const struct glsl_type
*
606 modulus_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
607 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
609 const glsl_type
*type_a
= value_a
->type
;
610 const glsl_type
*type_b
= value_b
->type
;
612 if (!state
->EXT_gpu_shader4_enable
&&
613 !state
->check_version(130, 300, loc
, "operator '%%' is reserved")) {
614 return glsl_type::error_type
;
617 /* Section 5.9 (Expressions) of the GLSL 4.00 specification says:
619 * "The operator modulus (%) operates on signed or unsigned integers or
622 if (!type_a
->is_integer_32_64()) {
623 _mesa_glsl_error(loc
, state
, "LHS of operator %% must be an integer");
624 return glsl_type::error_type
;
626 if (!type_b
->is_integer_32_64()) {
627 _mesa_glsl_error(loc
, state
, "RHS of operator %% must be an integer");
628 return glsl_type::error_type
;
631 /* "If the fundamental types in the operands do not match, then the
632 * conversions from section 4.1.10 "Implicit Conversions" are applied
633 * to create matching types."
635 * Note that GLSL 4.00 (and GL_ARB_gpu_shader5) introduced implicit
636 * int -> uint conversion rules. Prior to that, there were no implicit
637 * conversions. So it's harmless to apply them universally - no implicit
638 * conversions will exist. If the types don't match, we'll receive false,
639 * and raise an error, satisfying the GLSL 1.50 spec, page 56:
641 * "The operand types must both be signed or unsigned."
643 if (!apply_implicit_conversion(type_a
, value_b
, state
) &&
644 !apply_implicit_conversion(type_b
, value_a
, state
)) {
645 _mesa_glsl_error(loc
, state
,
646 "could not implicitly convert operands to "
647 "modulus (%%) operator");
648 return glsl_type::error_type
;
650 type_a
= value_a
->type
;
651 type_b
= value_b
->type
;
653 /* "The operands cannot be vectors of differing size. If one operand is
654 * a scalar and the other vector, then the scalar is applied component-
655 * wise to the vector, resulting in the same type as the vector. If both
656 * are vectors of the same size, the result is computed component-wise."
658 if (type_a
->is_vector()) {
659 if (!type_b
->is_vector()
660 || (type_a
->vector_elements
== type_b
->vector_elements
))
665 /* "The operator modulus (%) is not defined for any other data types
666 * (non-integer types)."
668 _mesa_glsl_error(loc
, state
, "type mismatch");
669 return glsl_type::error_type
;
673 static const struct glsl_type
*
674 relational_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
675 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
677 const glsl_type
*type_a
= value_a
->type
;
678 const glsl_type
*type_b
= value_b
->type
;
680 /* From GLSL 1.50 spec, page 56:
681 * "The relational operators greater than (>), less than (<), greater
682 * than or equal (>=), and less than or equal (<=) operate only on
683 * scalar integer and scalar floating-point expressions."
685 if (!type_a
->is_numeric()
686 || !type_b
->is_numeric()
687 || !type_a
->is_scalar()
688 || !type_b
->is_scalar()) {
689 _mesa_glsl_error(loc
, state
,
690 "operands to relational operators must be scalar and "
692 return glsl_type::error_type
;
695 /* "Either the operands' types must match, or the conversions from
696 * Section 4.1.10 "Implicit Conversions" will be applied to the integer
697 * operand, after which the types must match."
699 if (!apply_implicit_conversion(type_a
, value_b
, state
)
700 && !apply_implicit_conversion(type_b
, value_a
, state
)) {
701 _mesa_glsl_error(loc
, state
,
702 "could not implicitly convert operands to "
703 "relational operator");
704 return glsl_type::error_type
;
706 type_a
= value_a
->type
;
707 type_b
= value_b
->type
;
709 if (type_a
->base_type
!= type_b
->base_type
) {
710 _mesa_glsl_error(loc
, state
, "base type mismatch");
711 return glsl_type::error_type
;
714 /* "The result is scalar Boolean."
716 return glsl_type::bool_type
;
720 * \brief Return the result type of a bit-shift operation.
722 * If the given types to the bit-shift operator are invalid, return
723 * glsl_type::error_type.
725 * \param type_a Type of LHS of bit-shift op
726 * \param type_b Type of RHS of bit-shift op
728 static const struct glsl_type
*
729 shift_result_type(const struct glsl_type
*type_a
,
730 const struct glsl_type
*type_b
,
732 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
734 if (!state
->check_bitwise_operations_allowed(loc
)) {
735 return glsl_type::error_type
;
738 /* From page 50 (page 56 of the PDF) of the GLSL 1.30 spec:
740 * "The shift operators (<<) and (>>). For both operators, the operands
741 * must be signed or unsigned integers or integer vectors. One operand
742 * can be signed while the other is unsigned."
744 if (!type_a
->is_integer_32_64()) {
745 _mesa_glsl_error(loc
, state
, "LHS of operator %s must be an integer or "
746 "integer vector", ast_expression::operator_string(op
));
747 return glsl_type::error_type
;
750 if (!type_b
->is_integer_32()) {
751 _mesa_glsl_error(loc
, state
, "RHS of operator %s must be an integer or "
752 "integer vector", ast_expression::operator_string(op
));
753 return glsl_type::error_type
;
756 /* "If the first operand is a scalar, the second operand has to be
759 if (type_a
->is_scalar() && !type_b
->is_scalar()) {
760 _mesa_glsl_error(loc
, state
, "if the first operand of %s is scalar, the "
761 "second must be scalar as well",
762 ast_expression::operator_string(op
));
763 return glsl_type::error_type
;
766 /* If both operands are vectors, check that they have same number of
769 if (type_a
->is_vector() &&
770 type_b
->is_vector() &&
771 type_a
->vector_elements
!= type_b
->vector_elements
) {
772 _mesa_glsl_error(loc
, state
, "vector operands to operator %s must "
773 "have same number of elements",
774 ast_expression::operator_string(op
));
775 return glsl_type::error_type
;
778 /* "In all cases, the resulting type will be the same type as the left
785 * Returns the innermost array index expression in an rvalue tree.
786 * This is the largest indexing level -- if an array of blocks, then
787 * it is the block index rather than an indexing expression for an
788 * array-typed member of an array of blocks.
791 find_innermost_array_index(ir_rvalue
*rv
)
793 ir_dereference_array
*last
= NULL
;
795 if (rv
->as_dereference_array()) {
796 last
= rv
->as_dereference_array();
798 } else if (rv
->as_dereference_record())
799 rv
= rv
->as_dereference_record()->record
;
800 else if (rv
->as_swizzle())
801 rv
= rv
->as_swizzle()->val
;
807 return last
->array_index
;
813 * Validates that a value can be assigned to a location with a specified type
815 * Validates that \c rhs can be assigned to some location. If the types are
816 * not an exact match but an automatic conversion is possible, \c rhs will be
820 * \c NULL if \c rhs cannot be assigned to a location with type \c lhs_type.
821 * Otherwise the actual RHS to be assigned will be returned. This may be
822 * \c rhs, or it may be \c rhs after some type conversion.
825 * In addition to being used for assignments, this function is used to
826 * type-check return values.
829 validate_assignment(struct _mesa_glsl_parse_state
*state
,
830 YYLTYPE loc
, ir_rvalue
*lhs
,
831 ir_rvalue
*rhs
, bool is_initializer
)
833 /* If there is already some error in the RHS, just return it. Anything
834 * else will lead to an avalanche of error message back to the user.
836 if (rhs
->type
->is_error())
839 /* In the Tessellation Control Shader:
840 * If a per-vertex output variable is used as an l-value, it is an error
841 * if the expression indicating the vertex number is not the identifier
844 if (state
->stage
== MESA_SHADER_TESS_CTRL
&& !lhs
->type
->is_error()) {
845 ir_variable
*var
= lhs
->variable_referenced();
846 if (var
&& var
->data
.mode
== ir_var_shader_out
&& !var
->data
.patch
) {
847 ir_rvalue
*index
= find_innermost_array_index(lhs
);
848 ir_variable
*index_var
= index
? index
->variable_referenced() : NULL
;
849 if (!index_var
|| strcmp(index_var
->name
, "gl_InvocationID") != 0) {
850 _mesa_glsl_error(&loc
, state
,
851 "Tessellation control shader outputs can only "
852 "be indexed by gl_InvocationID");
858 /* If the types are identical, the assignment can trivially proceed.
860 if (rhs
->type
== lhs
->type
)
863 /* If the array element types are the same and the LHS is unsized,
864 * the assignment is okay for initializers embedded in variable
867 * Note: Whole-array assignments are not permitted in GLSL 1.10, but this
868 * is handled by ir_dereference::is_lvalue.
870 const glsl_type
*lhs_t
= lhs
->type
;
871 const glsl_type
*rhs_t
= rhs
->type
;
872 bool unsized_array
= false;
873 while(lhs_t
->is_array()) {
875 break; /* the rest of the inner arrays match so break out early */
876 if (!rhs_t
->is_array()) {
877 unsized_array
= false;
878 break; /* number of dimensions mismatch */
880 if (lhs_t
->length
== rhs_t
->length
) {
881 lhs_t
= lhs_t
->fields
.array
;
882 rhs_t
= rhs_t
->fields
.array
;
884 } else if (lhs_t
->is_unsized_array()) {
885 unsized_array
= true;
887 unsized_array
= false;
888 break; /* sized array mismatch */
890 lhs_t
= lhs_t
->fields
.array
;
891 rhs_t
= rhs_t
->fields
.array
;
894 if (is_initializer
) {
895 if (rhs
->type
->get_scalar_type() == lhs
->type
->get_scalar_type())
898 _mesa_glsl_error(&loc
, state
,
899 "implicitly sized arrays cannot be assigned");
904 /* Check for implicit conversion in GLSL 1.20 */
905 if (apply_implicit_conversion(lhs
->type
, rhs
, state
)) {
906 if (rhs
->type
== lhs
->type
)
910 _mesa_glsl_error(&loc
, state
,
911 "%s of type %s cannot be assigned to "
912 "variable of type %s",
913 is_initializer
? "initializer" : "value",
914 rhs
->type
->name
, lhs
->type
->name
);
920 mark_whole_array_access(ir_rvalue
*access
)
922 ir_dereference_variable
*deref
= access
->as_dereference_variable();
924 if (deref
&& deref
->var
) {
925 deref
->var
->data
.max_array_access
= deref
->type
->length
- 1;
930 do_assignment(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
,
931 const char *non_lvalue_description
,
932 ir_rvalue
*lhs
, ir_rvalue
*rhs
,
933 ir_rvalue
**out_rvalue
, bool needs_rvalue
,
938 bool error_emitted
= (lhs
->type
->is_error() || rhs
->type
->is_error());
940 ir_variable
*lhs_var
= lhs
->variable_referenced();
942 lhs_var
->data
.assigned
= true;
944 if (!error_emitted
) {
945 if (non_lvalue_description
!= NULL
) {
946 _mesa_glsl_error(&lhs_loc
, state
,
948 non_lvalue_description
);
949 error_emitted
= true;
950 } else if (lhs_var
!= NULL
&& (lhs_var
->data
.read_only
||
951 (lhs_var
->data
.mode
== ir_var_shader_storage
&&
952 lhs_var
->data
.memory_read_only
))) {
953 /* We can have memory_read_only set on both images and buffer variables,
954 * but in the former there is a distinction between assignments to
955 * the variable itself (read_only) and to the memory they point to
956 * (memory_read_only), while in the case of buffer variables there is
957 * no such distinction, that is why this check here is limited to
958 * buffer variables alone.
960 _mesa_glsl_error(&lhs_loc
, state
,
961 "assignment to read-only variable '%s'",
963 error_emitted
= true;
964 } else if (lhs
->type
->is_array() &&
965 !state
->check_version(120, 300, &lhs_loc
,
966 "whole array assignment forbidden")) {
967 /* From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
969 * "Other binary or unary expressions, non-dereferenced
970 * arrays, function names, swizzles with repeated fields,
971 * and constants cannot be l-values."
973 * The restriction on arrays is lifted in GLSL 1.20 and GLSL ES 3.00.
975 error_emitted
= true;
976 } else if (!lhs
->is_lvalue(state
)) {
977 _mesa_glsl_error(& lhs_loc
, state
, "non-lvalue in assignment");
978 error_emitted
= true;
983 validate_assignment(state
, lhs_loc
, lhs
, rhs
, is_initializer
);
984 if (new_rhs
!= NULL
) {
987 /* If the LHS array was not declared with a size, it takes it size from
988 * the RHS. If the LHS is an l-value and a whole array, it must be a
989 * dereference of a variable. Any other case would require that the LHS
990 * is either not an l-value or not a whole array.
992 if (lhs
->type
->is_unsized_array()) {
993 ir_dereference
*const d
= lhs
->as_dereference();
997 ir_variable
*const var
= d
->variable_referenced();
1001 if (var
->data
.max_array_access
>= rhs
->type
->array_size()) {
1002 /* FINISHME: This should actually log the location of the RHS. */
1003 _mesa_glsl_error(& lhs_loc
, state
, "array size must be > %u due to "
1005 var
->data
.max_array_access
);
1008 var
->type
= glsl_type::get_array_instance(lhs
->type
->fields
.array
,
1009 rhs
->type
->array_size());
1010 d
->type
= var
->type
;
1012 if (lhs
->type
->is_array()) {
1013 mark_whole_array_access(rhs
);
1014 mark_whole_array_access(lhs
);
1017 error_emitted
= true;
1020 /* Most callers of do_assignment (assign, add_assign, pre_inc/dec,
1021 * but not post_inc) need the converted assigned value as an rvalue
1022 * to handle things like:
1028 if (!error_emitted
) {
1029 ir_variable
*var
= new(ctx
) ir_variable(rhs
->type
, "assignment_tmp",
1031 instructions
->push_tail(var
);
1032 instructions
->push_tail(assign(var
, rhs
));
1034 ir_dereference_variable
*deref_var
=
1035 new(ctx
) ir_dereference_variable(var
);
1036 instructions
->push_tail(new(ctx
) ir_assignment(lhs
, deref_var
));
1037 rvalue
= new(ctx
) ir_dereference_variable(var
);
1039 rvalue
= ir_rvalue::error_value(ctx
);
1041 *out_rvalue
= rvalue
;
1044 instructions
->push_tail(new(ctx
) ir_assignment(lhs
, rhs
));
1048 return error_emitted
;
1052 get_lvalue_copy(exec_list
*instructions
, ir_rvalue
*lvalue
)
1054 void *ctx
= ralloc_parent(lvalue
);
1057 var
= new(ctx
) ir_variable(lvalue
->type
, "_post_incdec_tmp",
1059 instructions
->push_tail(var
);
1061 instructions
->push_tail(new(ctx
) ir_assignment(new(ctx
) ir_dereference_variable(var
),
1064 return new(ctx
) ir_dereference_variable(var
);
1069 ast_node::hir(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
)
1071 (void) instructions
;
1078 ast_node::has_sequence_subexpression() const
1084 ast_node::set_is_lhs(bool /* new_value */)
1089 ast_function_expression::hir_no_rvalue(exec_list
*instructions
,
1090 struct _mesa_glsl_parse_state
*state
)
1092 (void)hir(instructions
, state
);
1096 ast_aggregate_initializer::hir_no_rvalue(exec_list
*instructions
,
1097 struct _mesa_glsl_parse_state
*state
)
1099 (void)hir(instructions
, state
);
1103 do_comparison(void *mem_ctx
, int operation
, ir_rvalue
*op0
, ir_rvalue
*op1
)
1106 ir_rvalue
*cmp
= NULL
;
1108 if (operation
== ir_binop_all_equal
)
1109 join_op
= ir_binop_logic_and
;
1111 join_op
= ir_binop_logic_or
;
1113 switch (op0
->type
->base_type
) {
1114 case GLSL_TYPE_FLOAT
:
1115 case GLSL_TYPE_FLOAT16
:
1116 case GLSL_TYPE_UINT
:
1118 case GLSL_TYPE_BOOL
:
1119 case GLSL_TYPE_DOUBLE
:
1120 case GLSL_TYPE_UINT64
:
1121 case GLSL_TYPE_INT64
:
1122 case GLSL_TYPE_UINT16
:
1123 case GLSL_TYPE_INT16
:
1124 case GLSL_TYPE_UINT8
:
1125 case GLSL_TYPE_INT8
:
1126 return new(mem_ctx
) ir_expression(operation
, op0
, op1
);
1128 case GLSL_TYPE_ARRAY
: {
1129 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
1130 ir_rvalue
*e0
, *e1
, *result
;
1132 e0
= new(mem_ctx
) ir_dereference_array(op0
->clone(mem_ctx
, NULL
),
1133 new(mem_ctx
) ir_constant(i
));
1134 e1
= new(mem_ctx
) ir_dereference_array(op1
->clone(mem_ctx
, NULL
),
1135 new(mem_ctx
) ir_constant(i
));
1136 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
1139 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
1145 mark_whole_array_access(op0
);
1146 mark_whole_array_access(op1
);
1150 case GLSL_TYPE_STRUCT
: {
1151 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
1152 ir_rvalue
*e0
, *e1
, *result
;
1153 const char *field_name
= op0
->type
->fields
.structure
[i
].name
;
1155 e0
= new(mem_ctx
) ir_dereference_record(op0
->clone(mem_ctx
, NULL
),
1157 e1
= new(mem_ctx
) ir_dereference_record(op1
->clone(mem_ctx
, NULL
),
1159 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
1162 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
1170 case GLSL_TYPE_ERROR
:
1171 case GLSL_TYPE_VOID
:
1172 case GLSL_TYPE_SAMPLER
:
1173 case GLSL_TYPE_IMAGE
:
1174 case GLSL_TYPE_INTERFACE
:
1175 case GLSL_TYPE_ATOMIC_UINT
:
1176 case GLSL_TYPE_SUBROUTINE
:
1177 case GLSL_TYPE_FUNCTION
:
1178 /* I assume a comparison of a struct containing a sampler just
1179 * ignores the sampler present in the type.
1185 cmp
= new(mem_ctx
) ir_constant(true);
1190 /* For logical operations, we want to ensure that the operands are
1191 * scalar booleans. If it isn't, emit an error and return a constant
1192 * boolean to avoid triggering cascading error messages.
1195 get_scalar_boolean_operand(exec_list
*instructions
,
1196 struct _mesa_glsl_parse_state
*state
,
1197 ast_expression
*parent_expr
,
1199 const char *operand_name
,
1200 bool *error_emitted
)
1202 ast_expression
*expr
= parent_expr
->subexpressions
[operand
];
1204 ir_rvalue
*val
= expr
->hir(instructions
, state
);
1206 if (val
->type
->is_boolean() && val
->type
->is_scalar())
1209 if (!*error_emitted
) {
1210 YYLTYPE loc
= expr
->get_location();
1211 _mesa_glsl_error(&loc
, state
, "%s of `%s' must be scalar boolean",
1213 parent_expr
->operator_string(parent_expr
->oper
));
1214 *error_emitted
= true;
1217 return new(ctx
) ir_constant(true);
1221 * If name refers to a builtin array whose maximum allowed size is less than
1222 * size, report an error and return true. Otherwise return false.
1225 check_builtin_array_max_size(const char *name
, unsigned size
,
1226 YYLTYPE loc
, struct _mesa_glsl_parse_state
*state
)
1228 if ((strcmp("gl_TexCoord", name
) == 0)
1229 && (size
> state
->Const
.MaxTextureCoords
)) {
1230 /* From page 54 (page 60 of the PDF) of the GLSL 1.20 spec:
1232 * "The size [of gl_TexCoord] can be at most
1233 * gl_MaxTextureCoords."
1235 _mesa_glsl_error(&loc
, state
, "`gl_TexCoord' array size cannot "
1236 "be larger than gl_MaxTextureCoords (%u)",
1237 state
->Const
.MaxTextureCoords
);
1238 } else if (strcmp("gl_ClipDistance", name
) == 0) {
1239 state
->clip_dist_size
= size
;
1240 if (size
+ state
->cull_dist_size
> state
->Const
.MaxClipPlanes
) {
1241 /* From section 7.1 (Vertex Shader Special Variables) of the
1244 * "The gl_ClipDistance array is predeclared as unsized and
1245 * must be sized by the shader either redeclaring it with a
1246 * size or indexing it only with integral constant
1247 * expressions. ... The size can be at most
1248 * gl_MaxClipDistances."
1250 _mesa_glsl_error(&loc
, state
, "`gl_ClipDistance' array size cannot "
1251 "be larger than gl_MaxClipDistances (%u)",
1252 state
->Const
.MaxClipPlanes
);
1254 } else if (strcmp("gl_CullDistance", name
) == 0) {
1255 state
->cull_dist_size
= size
;
1256 if (size
+ state
->clip_dist_size
> state
->Const
.MaxClipPlanes
) {
1257 /* From the ARB_cull_distance spec:
1259 * "The gl_CullDistance array is predeclared as unsized and
1260 * must be sized by the shader either redeclaring it with
1261 * a size or indexing it only with integral constant
1262 * expressions. The size determines the number and set of
1263 * enabled cull distances and can be at most
1264 * gl_MaxCullDistances."
1266 _mesa_glsl_error(&loc
, state
, "`gl_CullDistance' array size cannot "
1267 "be larger than gl_MaxCullDistances (%u)",
1268 state
->Const
.MaxClipPlanes
);
1274 * Create the constant 1, of a which is appropriate for incrementing and
1275 * decrementing values of the given GLSL type. For example, if type is vec4,
1276 * this creates a constant value of 1.0 having type float.
1278 * If the given type is invalid for increment and decrement operators, return
1279 * a floating point 1--the error will be detected later.
1282 constant_one_for_inc_dec(void *ctx
, const glsl_type
*type
)
1284 switch (type
->base_type
) {
1285 case GLSL_TYPE_UINT
:
1286 return new(ctx
) ir_constant((unsigned) 1);
1288 return new(ctx
) ir_constant(1);
1289 case GLSL_TYPE_UINT64
:
1290 return new(ctx
) ir_constant((uint64_t) 1);
1291 case GLSL_TYPE_INT64
:
1292 return new(ctx
) ir_constant((int64_t) 1);
1294 case GLSL_TYPE_FLOAT
:
1295 return new(ctx
) ir_constant(1.0f
);
1300 ast_expression::hir(exec_list
*instructions
,
1301 struct _mesa_glsl_parse_state
*state
)
1303 return do_hir(instructions
, state
, true);
1307 ast_expression::hir_no_rvalue(exec_list
*instructions
,
1308 struct _mesa_glsl_parse_state
*state
)
1310 do_hir(instructions
, state
, false);
1314 ast_expression::set_is_lhs(bool new_value
)
1316 /* is_lhs is tracked only to print "variable used uninitialized" warnings,
1317 * if we lack an identifier we can just skip it.
1319 if (this->primary_expression
.identifier
== NULL
)
1322 this->is_lhs
= new_value
;
1324 /* We need to go through the subexpressions tree to cover cases like
1325 * ast_field_selection
1327 if (this->subexpressions
[0] != NULL
)
1328 this->subexpressions
[0]->set_is_lhs(new_value
);
1332 ast_expression::do_hir(exec_list
*instructions
,
1333 struct _mesa_glsl_parse_state
*state
,
1337 static const int operations
[AST_NUM_OPERATORS
] = {
1338 -1, /* ast_assign doesn't convert to ir_expression. */
1339 -1, /* ast_plus doesn't convert to ir_expression. */
1349 ir_binop_less
, /* This is correct. See the ast_greater case below. */
1350 ir_binop_gequal
, /* This is correct. See the ast_lequal case below. */
1353 ir_binop_any_nequal
,
1363 /* Note: The following block of expression types actually convert
1364 * to multiple IR instructions.
1366 ir_binop_mul
, /* ast_mul_assign */
1367 ir_binop_div
, /* ast_div_assign */
1368 ir_binop_mod
, /* ast_mod_assign */
1369 ir_binop_add
, /* ast_add_assign */
1370 ir_binop_sub
, /* ast_sub_assign */
1371 ir_binop_lshift
, /* ast_ls_assign */
1372 ir_binop_rshift
, /* ast_rs_assign */
1373 ir_binop_bit_and
, /* ast_and_assign */
1374 ir_binop_bit_xor
, /* ast_xor_assign */
1375 ir_binop_bit_or
, /* ast_or_assign */
1377 -1, /* ast_conditional doesn't convert to ir_expression. */
1378 ir_binop_add
, /* ast_pre_inc. */
1379 ir_binop_sub
, /* ast_pre_dec. */
1380 ir_binop_add
, /* ast_post_inc. */
1381 ir_binop_sub
, /* ast_post_dec. */
1382 -1, /* ast_field_selection doesn't conv to ir_expression. */
1383 -1, /* ast_array_index doesn't convert to ir_expression. */
1384 -1, /* ast_function_call doesn't conv to ir_expression. */
1385 -1, /* ast_identifier doesn't convert to ir_expression. */
1386 -1, /* ast_int_constant doesn't convert to ir_expression. */
1387 -1, /* ast_uint_constant doesn't conv to ir_expression. */
1388 -1, /* ast_float_constant doesn't conv to ir_expression. */
1389 -1, /* ast_bool_constant doesn't conv to ir_expression. */
1390 -1, /* ast_sequence doesn't convert to ir_expression. */
1391 -1, /* ast_aggregate shouldn't ever even get here. */
1393 ir_rvalue
*result
= NULL
;
1395 const struct glsl_type
*type
, *orig_type
;
1396 bool error_emitted
= false;
1399 loc
= this->get_location();
1401 switch (this->oper
) {
1403 unreachable("ast_aggregate: Should never get here.");
1406 this->subexpressions
[0]->set_is_lhs(true);
1407 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1408 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1411 do_assignment(instructions
, state
,
1412 this->subexpressions
[0]->non_lvalue_description
,
1413 op
[0], op
[1], &result
, needs_rvalue
, false,
1414 this->subexpressions
[0]->get_location());
1419 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1421 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1423 error_emitted
= type
->is_error();
1429 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1431 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1433 error_emitted
= type
->is_error();
1435 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1443 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1444 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1446 type
= arithmetic_result_type(op
[0], op
[1],
1447 (this->oper
== ast_mul
),
1449 error_emitted
= type
->is_error();
1451 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1456 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1457 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1459 type
= modulus_result_type(op
[0], op
[1], state
, &loc
);
1461 assert(operations
[this->oper
] == ir_binop_mod
);
1463 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1465 error_emitted
= type
->is_error();
1470 if (!state
->check_bitwise_operations_allowed(&loc
)) {
1471 error_emitted
= true;
1474 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1475 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1476 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1478 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1480 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1487 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1488 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1490 type
= relational_result_type(op
[0], op
[1], state
, & loc
);
1492 /* The relational operators must either generate an error or result
1493 * in a scalar boolean. See page 57 of the GLSL 1.50 spec.
1495 assert(type
->is_error()
1496 || (type
->is_boolean() && type
->is_scalar()));
1498 /* Like NIR, GLSL IR does not have opcodes for > or <=. Instead, swap
1499 * the arguments and use < or >=.
1501 if (this->oper
== ast_greater
|| this->oper
== ast_lequal
) {
1502 ir_rvalue
*const tmp
= op
[0];
1507 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1509 error_emitted
= type
->is_error();
1514 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1515 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1517 /* From page 58 (page 64 of the PDF) of the GLSL 1.50 spec:
1519 * "The equality operators equal (==), and not equal (!=)
1520 * operate on all types. They result in a scalar Boolean. If
1521 * the operand types do not match, then there must be a
1522 * conversion from Section 4.1.10 "Implicit Conversions"
1523 * applied to one operand that can make them match, in which
1524 * case this conversion is done."
1527 if (op
[0]->type
== glsl_type::void_type
|| op
[1]->type
== glsl_type::void_type
) {
1528 _mesa_glsl_error(& loc
, state
, "`%s': wrong operand types: "
1529 "no operation `%1$s' exists that takes a left-hand "
1530 "operand of type 'void' or a right operand of type "
1531 "'void'", (this->oper
== ast_equal
) ? "==" : "!=");
1532 error_emitted
= true;
1533 } else if ((!apply_implicit_conversion(op
[0]->type
, op
[1], state
)
1534 && !apply_implicit_conversion(op
[1]->type
, op
[0], state
))
1535 || (op
[0]->type
!= op
[1]->type
)) {
1536 _mesa_glsl_error(& loc
, state
, "operands of `%s' must have the same "
1537 "type", (this->oper
== ast_equal
) ? "==" : "!=");
1538 error_emitted
= true;
1539 } else if ((op
[0]->type
->is_array() || op
[1]->type
->is_array()) &&
1540 !state
->check_version(120, 300, &loc
,
1541 "array comparisons forbidden")) {
1542 error_emitted
= true;
1543 } else if ((op
[0]->type
->contains_subroutine() ||
1544 op
[1]->type
->contains_subroutine())) {
1545 _mesa_glsl_error(&loc
, state
, "subroutine comparisons forbidden");
1546 error_emitted
= true;
1547 } else if ((op
[0]->type
->contains_opaque() ||
1548 op
[1]->type
->contains_opaque())) {
1549 _mesa_glsl_error(&loc
, state
, "opaque type comparisons forbidden");
1550 error_emitted
= true;
1553 if (error_emitted
) {
1554 result
= new(ctx
) ir_constant(false);
1556 result
= do_comparison(ctx
, operations
[this->oper
], op
[0], op
[1]);
1557 assert(result
->type
== glsl_type::bool_type
);
1564 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1565 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1566 type
= bit_logic_result_type(op
[0], op
[1], this->oper
, state
, &loc
);
1567 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1569 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1573 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1575 if (!state
->check_bitwise_operations_allowed(&loc
)) {
1576 error_emitted
= true;
1579 if (!op
[0]->type
->is_integer_32_64()) {
1580 _mesa_glsl_error(&loc
, state
, "operand of `~' must be an integer");
1581 error_emitted
= true;
1584 type
= error_emitted
? glsl_type::error_type
: op
[0]->type
;
1585 result
= new(ctx
) ir_expression(ir_unop_bit_not
, type
, op
[0], NULL
);
1588 case ast_logic_and
: {
1589 exec_list rhs_instructions
;
1590 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1591 "LHS", &error_emitted
);
1592 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1593 "RHS", &error_emitted
);
1595 if (rhs_instructions
.is_empty()) {
1596 result
= new(ctx
) ir_expression(ir_binop_logic_and
, op
[0], op
[1]);
1598 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1601 instructions
->push_tail(tmp
);
1603 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1604 instructions
->push_tail(stmt
);
1606 stmt
->then_instructions
.append_list(&rhs_instructions
);
1607 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1608 ir_assignment
*const then_assign
=
1609 new(ctx
) ir_assignment(then_deref
, op
[1]);
1610 stmt
->then_instructions
.push_tail(then_assign
);
1612 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1613 ir_assignment
*const else_assign
=
1614 new(ctx
) ir_assignment(else_deref
, new(ctx
) ir_constant(false));
1615 stmt
->else_instructions
.push_tail(else_assign
);
1617 result
= new(ctx
) ir_dereference_variable(tmp
);
1622 case ast_logic_or
: {
1623 exec_list rhs_instructions
;
1624 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1625 "LHS", &error_emitted
);
1626 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1627 "RHS", &error_emitted
);
1629 if (rhs_instructions
.is_empty()) {
1630 result
= new(ctx
) ir_expression(ir_binop_logic_or
, op
[0], op
[1]);
1632 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1635 instructions
->push_tail(tmp
);
1637 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1638 instructions
->push_tail(stmt
);
1640 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1641 ir_assignment
*const then_assign
=
1642 new(ctx
) ir_assignment(then_deref
, new(ctx
) ir_constant(true));
1643 stmt
->then_instructions
.push_tail(then_assign
);
1645 stmt
->else_instructions
.append_list(&rhs_instructions
);
1646 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1647 ir_assignment
*const else_assign
=
1648 new(ctx
) ir_assignment(else_deref
, op
[1]);
1649 stmt
->else_instructions
.push_tail(else_assign
);
1651 result
= new(ctx
) ir_dereference_variable(tmp
);
1657 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1659 * "The logical binary operators and (&&), or ( | | ), and
1660 * exclusive or (^^). They operate only on two Boolean
1661 * expressions and result in a Boolean expression."
1663 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0, "LHS",
1665 op
[1] = get_scalar_boolean_operand(instructions
, state
, this, 1, "RHS",
1668 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1673 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1674 "operand", &error_emitted
);
1676 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1680 case ast_mul_assign
:
1681 case ast_div_assign
:
1682 case ast_add_assign
:
1683 case ast_sub_assign
: {
1684 this->subexpressions
[0]->set_is_lhs(true);
1685 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1686 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1688 orig_type
= op
[0]->type
;
1690 /* Break out if operand types were not parsed successfully. */
1691 if ((op
[0]->type
== glsl_type::error_type
||
1692 op
[1]->type
== glsl_type::error_type
)) {
1693 type
= glsl_type::error_type
;
1694 error_emitted
= true;
1698 type
= arithmetic_result_type(op
[0], op
[1],
1699 (this->oper
== ast_mul_assign
),
1702 if (type
!= orig_type
) {
1703 _mesa_glsl_error(& loc
, state
,
1704 "could not implicitly convert "
1705 "%s to %s", type
->name
, orig_type
->name
);
1706 type
= glsl_type::error_type
;
1709 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1713 do_assignment(instructions
, state
,
1714 this->subexpressions
[0]->non_lvalue_description
,
1715 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1716 &result
, needs_rvalue
, false,
1717 this->subexpressions
[0]->get_location());
1719 /* GLSL 1.10 does not allow array assignment. However, we don't have to
1720 * explicitly test for this because none of the binary expression
1721 * operators allow array operands either.
1727 case ast_mod_assign
: {
1728 this->subexpressions
[0]->set_is_lhs(true);
1729 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1730 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1732 orig_type
= op
[0]->type
;
1733 type
= modulus_result_type(op
[0], op
[1], state
, &loc
);
1735 if (type
!= orig_type
) {
1736 _mesa_glsl_error(& loc
, state
,
1737 "could not implicitly convert "
1738 "%s to %s", type
->name
, orig_type
->name
);
1739 type
= glsl_type::error_type
;
1742 assert(operations
[this->oper
] == ir_binop_mod
);
1744 ir_rvalue
*temp_rhs
;
1745 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1749 do_assignment(instructions
, state
,
1750 this->subexpressions
[0]->non_lvalue_description
,
1751 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1752 &result
, needs_rvalue
, false,
1753 this->subexpressions
[0]->get_location());
1758 case ast_rs_assign
: {
1759 this->subexpressions
[0]->set_is_lhs(true);
1760 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1761 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1762 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1764 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1765 type
, op
[0], op
[1]);
1767 do_assignment(instructions
, state
,
1768 this->subexpressions
[0]->non_lvalue_description
,
1769 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1770 &result
, needs_rvalue
, false,
1771 this->subexpressions
[0]->get_location());
1775 case ast_and_assign
:
1776 case ast_xor_assign
:
1777 case ast_or_assign
: {
1778 this->subexpressions
[0]->set_is_lhs(true);
1779 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1780 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1782 orig_type
= op
[0]->type
;
1783 type
= bit_logic_result_type(op
[0], op
[1], this->oper
, state
, &loc
);
1785 if (type
!= orig_type
) {
1786 _mesa_glsl_error(& loc
, state
,
1787 "could not implicitly convert "
1788 "%s to %s", type
->name
, orig_type
->name
);
1789 type
= glsl_type::error_type
;
1792 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1793 type
, op
[0], op
[1]);
1795 do_assignment(instructions
, state
,
1796 this->subexpressions
[0]->non_lvalue_description
,
1797 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1798 &result
, needs_rvalue
, false,
1799 this->subexpressions
[0]->get_location());
1803 case ast_conditional
: {
1804 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1806 * "The ternary selection operator (?:). It operates on three
1807 * expressions (exp1 ? exp2 : exp3). This operator evaluates the
1808 * first expression, which must result in a scalar Boolean."
1810 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1811 "condition", &error_emitted
);
1813 /* The :? operator is implemented by generating an anonymous temporary
1814 * followed by an if-statement. The last instruction in each branch of
1815 * the if-statement assigns a value to the anonymous temporary. This
1816 * temporary is the r-value of the expression.
1818 exec_list then_instructions
;
1819 exec_list else_instructions
;
1821 op
[1] = this->subexpressions
[1]->hir(&then_instructions
, state
);
1822 op
[2] = this->subexpressions
[2]->hir(&else_instructions
, state
);
1824 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1826 * "The second and third expressions can be any type, as
1827 * long their types match, or there is a conversion in
1828 * Section 4.1.10 "Implicit Conversions" that can be applied
1829 * to one of the expressions to make their types match. This
1830 * resulting matching type is the type of the entire
1833 if ((!apply_implicit_conversion(op
[1]->type
, op
[2], state
)
1834 && !apply_implicit_conversion(op
[2]->type
, op
[1], state
))
1835 || (op
[1]->type
!= op
[2]->type
)) {
1836 YYLTYPE loc
= this->subexpressions
[1]->get_location();
1838 _mesa_glsl_error(& loc
, state
, "second and third operands of ?: "
1839 "operator must have matching types");
1840 error_emitted
= true;
1841 type
= glsl_type::error_type
;
1846 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1848 * "The second and third expressions must be the same type, but can
1849 * be of any type other than an array."
1851 if (type
->is_array() &&
1852 !state
->check_version(120, 300, &loc
,
1853 "second and third operands of ?: operator "
1854 "cannot be arrays")) {
1855 error_emitted
= true;
1858 /* From section 4.1.7 of the GLSL 4.50 spec (Opaque Types):
1860 * "Except for array indexing, structure member selection, and
1861 * parentheses, opaque variables are not allowed to be operands in
1862 * expressions; such use results in a compile-time error."
1864 if (type
->contains_opaque()) {
1865 if (!(state
->has_bindless() && (type
->is_image() || type
->is_sampler()))) {
1866 _mesa_glsl_error(&loc
, state
, "variables of type %s cannot be "
1867 "operands of the ?: operator", type
->name
);
1868 error_emitted
= true;
1872 ir_constant
*cond_val
= op
[0]->constant_expression_value(ctx
);
1874 if (then_instructions
.is_empty()
1875 && else_instructions
.is_empty()
1876 && cond_val
!= NULL
) {
1877 result
= cond_val
->value
.b
[0] ? op
[1] : op
[2];
1879 /* The copy to conditional_tmp reads the whole array. */
1880 if (type
->is_array()) {
1881 mark_whole_array_access(op
[1]);
1882 mark_whole_array_access(op
[2]);
1885 ir_variable
*const tmp
=
1886 new(ctx
) ir_variable(type
, "conditional_tmp", ir_var_temporary
);
1887 instructions
->push_tail(tmp
);
1889 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1890 instructions
->push_tail(stmt
);
1892 then_instructions
.move_nodes_to(& stmt
->then_instructions
);
1893 ir_dereference
*const then_deref
=
1894 new(ctx
) ir_dereference_variable(tmp
);
1895 ir_assignment
*const then_assign
=
1896 new(ctx
) ir_assignment(then_deref
, op
[1]);
1897 stmt
->then_instructions
.push_tail(then_assign
);
1899 else_instructions
.move_nodes_to(& stmt
->else_instructions
);
1900 ir_dereference
*const else_deref
=
1901 new(ctx
) ir_dereference_variable(tmp
);
1902 ir_assignment
*const else_assign
=
1903 new(ctx
) ir_assignment(else_deref
, op
[2]);
1904 stmt
->else_instructions
.push_tail(else_assign
);
1906 result
= new(ctx
) ir_dereference_variable(tmp
);
1913 this->non_lvalue_description
= (this->oper
== ast_pre_inc
)
1914 ? "pre-increment operation" : "pre-decrement operation";
1916 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1917 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1919 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1921 ir_rvalue
*temp_rhs
;
1922 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1926 do_assignment(instructions
, state
,
1927 this->subexpressions
[0]->non_lvalue_description
,
1928 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1929 &result
, needs_rvalue
, false,
1930 this->subexpressions
[0]->get_location());
1935 case ast_post_dec
: {
1936 this->non_lvalue_description
= (this->oper
== ast_post_inc
)
1937 ? "post-increment operation" : "post-decrement operation";
1938 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1939 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1941 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1943 if (error_emitted
) {
1944 result
= ir_rvalue::error_value(ctx
);
1948 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1950 ir_rvalue
*temp_rhs
;
1951 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1954 /* Get a temporary of a copy of the lvalue before it's modified.
1955 * This may get thrown away later.
1957 result
= get_lvalue_copy(instructions
, op
[0]->clone(ctx
, NULL
));
1959 ir_rvalue
*junk_rvalue
;
1961 do_assignment(instructions
, state
,
1962 this->subexpressions
[0]->non_lvalue_description
,
1963 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1964 &junk_rvalue
, false, false,
1965 this->subexpressions
[0]->get_location());
1970 case ast_field_selection
:
1971 result
= _mesa_ast_field_selection_to_hir(this, instructions
, state
);
1974 case ast_array_index
: {
1975 YYLTYPE index_loc
= subexpressions
[1]->get_location();
1977 /* Getting if an array is being used uninitialized is beyond what we get
1978 * from ir_value.data.assigned. Setting is_lhs as true would force to
1979 * not raise a uninitialized warning when using an array
1981 subexpressions
[0]->set_is_lhs(true);
1982 op
[0] = subexpressions
[0]->hir(instructions
, state
);
1983 op
[1] = subexpressions
[1]->hir(instructions
, state
);
1985 result
= _mesa_ast_array_index_to_hir(ctx
, state
, op
[0], op
[1],
1988 if (result
->type
->is_error())
1989 error_emitted
= true;
1994 case ast_unsized_array_dim
:
1995 unreachable("ast_unsized_array_dim: Should never get here.");
1997 case ast_function_call
:
1998 /* Should *NEVER* get here. ast_function_call should always be handled
1999 * by ast_function_expression::hir.
2001 unreachable("ast_function_call: handled elsewhere ");
2003 case ast_identifier
: {
2004 /* ast_identifier can appear several places in a full abstract syntax
2005 * tree. This particular use must be at location specified in the grammar
2006 * as 'variable_identifier'.
2009 state
->symbols
->get_variable(this->primary_expression
.identifier
);
2012 /* the identifier might be a subroutine name */
2014 sub_name
= ralloc_asprintf(ctx
, "%s_%s", _mesa_shader_stage_to_subroutine_prefix(state
->stage
), this->primary_expression
.identifier
);
2015 var
= state
->symbols
->get_variable(sub_name
);
2016 ralloc_free(sub_name
);
2020 var
->data
.used
= true;
2021 result
= new(ctx
) ir_dereference_variable(var
);
2023 if ((var
->data
.mode
== ir_var_auto
|| var
->data
.mode
== ir_var_shader_out
)
2025 && result
->variable_referenced()->data
.assigned
!= true
2026 && !is_gl_identifier(var
->name
)) {
2027 _mesa_glsl_warning(&loc
, state
, "`%s' used uninitialized",
2028 this->primary_expression
.identifier
);
2031 /* From the EXT_shader_framebuffer_fetch spec:
2033 * "Unless the GL_EXT_shader_framebuffer_fetch extension has been
2034 * enabled in addition, it's an error to use gl_LastFragData if it
2035 * hasn't been explicitly redeclared with layout(noncoherent)."
2037 if (var
->data
.fb_fetch_output
&& var
->data
.memory_coherent
&&
2038 !state
->EXT_shader_framebuffer_fetch_enable
) {
2039 _mesa_glsl_error(&loc
, state
,
2040 "invalid use of framebuffer fetch output not "
2041 "qualified with layout(noncoherent)");
2045 _mesa_glsl_error(& loc
, state
, "`%s' undeclared",
2046 this->primary_expression
.identifier
);
2048 result
= ir_rvalue::error_value(ctx
);
2049 error_emitted
= true;
2054 case ast_int_constant
:
2055 result
= new(ctx
) ir_constant(this->primary_expression
.int_constant
);
2058 case ast_uint_constant
:
2059 result
= new(ctx
) ir_constant(this->primary_expression
.uint_constant
);
2062 case ast_float_constant
:
2063 result
= new(ctx
) ir_constant(this->primary_expression
.float_constant
);
2066 case ast_bool_constant
:
2067 result
= new(ctx
) ir_constant(bool(this->primary_expression
.bool_constant
));
2070 case ast_double_constant
:
2071 result
= new(ctx
) ir_constant(this->primary_expression
.double_constant
);
2074 case ast_uint64_constant
:
2075 result
= new(ctx
) ir_constant(this->primary_expression
.uint64_constant
);
2078 case ast_int64_constant
:
2079 result
= new(ctx
) ir_constant(this->primary_expression
.int64_constant
);
2082 case ast_sequence
: {
2083 /* It should not be possible to generate a sequence in the AST without
2084 * any expressions in it.
2086 assert(!this->expressions
.is_empty());
2088 /* The r-value of a sequence is the last expression in the sequence. If
2089 * the other expressions in the sequence do not have side-effects (and
2090 * therefore add instructions to the instruction list), they get dropped
2093 exec_node
*previous_tail
= NULL
;
2094 YYLTYPE previous_operand_loc
= loc
;
2096 foreach_list_typed (ast_node
, ast
, link
, &this->expressions
) {
2097 /* If one of the operands of comma operator does not generate any
2098 * code, we want to emit a warning. At each pass through the loop
2099 * previous_tail will point to the last instruction in the stream
2100 * *before* processing the previous operand. Naturally,
2101 * instructions->get_tail_raw() will point to the last instruction in
2102 * the stream *after* processing the previous operand. If the two
2103 * pointers match, then the previous operand had no effect.
2105 * The warning behavior here differs slightly from GCC. GCC will
2106 * only emit a warning if none of the left-hand operands have an
2107 * effect. However, it will emit a warning for each. I believe that
2108 * there are some cases in C (especially with GCC extensions) where
2109 * it is useful to have an intermediate step in a sequence have no
2110 * effect, but I don't think these cases exist in GLSL. Either way,
2111 * it would be a giant hassle to replicate that behavior.
2113 if (previous_tail
== instructions
->get_tail_raw()) {
2114 _mesa_glsl_warning(&previous_operand_loc
, state
,
2115 "left-hand operand of comma expression has "
2119 /* The tail is directly accessed instead of using the get_tail()
2120 * method for performance reasons. get_tail() has extra code to
2121 * return NULL when the list is empty. We don't care about that
2122 * here, so using get_tail_raw() is fine.
2124 previous_tail
= instructions
->get_tail_raw();
2125 previous_operand_loc
= ast
->get_location();
2127 result
= ast
->hir(instructions
, state
);
2130 /* Any errors should have already been emitted in the loop above.
2132 error_emitted
= true;
2136 type
= NULL
; /* use result->type, not type. */
2137 assert(error_emitted
|| (result
!= NULL
|| !needs_rvalue
));
2139 if (result
&& result
->type
->is_error() && !error_emitted
)
2140 _mesa_glsl_error(& loc
, state
, "type mismatch");
2146 ast_expression::has_sequence_subexpression() const
2148 switch (this->oper
) {
2157 return this->subexpressions
[0]->has_sequence_subexpression();
2179 case ast_array_index
:
2180 case ast_mul_assign
:
2181 case ast_div_assign
:
2182 case ast_add_assign
:
2183 case ast_sub_assign
:
2184 case ast_mod_assign
:
2187 case ast_and_assign
:
2188 case ast_xor_assign
:
2190 return this->subexpressions
[0]->has_sequence_subexpression() ||
2191 this->subexpressions
[1]->has_sequence_subexpression();
2193 case ast_conditional
:
2194 return this->subexpressions
[0]->has_sequence_subexpression() ||
2195 this->subexpressions
[1]->has_sequence_subexpression() ||
2196 this->subexpressions
[2]->has_sequence_subexpression();
2201 case ast_field_selection
:
2202 case ast_identifier
:
2203 case ast_int_constant
:
2204 case ast_uint_constant
:
2205 case ast_float_constant
:
2206 case ast_bool_constant
:
2207 case ast_double_constant
:
2208 case ast_int64_constant
:
2209 case ast_uint64_constant
:
2215 case ast_function_call
:
2216 unreachable("should be handled by ast_function_expression::hir");
2218 case ast_unsized_array_dim
:
2219 unreachable("ast_unsized_array_dim: Should never get here.");
2226 ast_expression_statement::hir(exec_list
*instructions
,
2227 struct _mesa_glsl_parse_state
*state
)
2229 /* It is possible to have expression statements that don't have an
2230 * expression. This is the solitary semicolon:
2232 * for (i = 0; i < 5; i++)
2235 * In this case the expression will be NULL. Test for NULL and don't do
2236 * anything in that case.
2238 if (expression
!= NULL
)
2239 expression
->hir_no_rvalue(instructions
, state
);
2241 /* Statements do not have r-values.
2248 ast_compound_statement::hir(exec_list
*instructions
,
2249 struct _mesa_glsl_parse_state
*state
)
2252 state
->symbols
->push_scope();
2254 foreach_list_typed (ast_node
, ast
, link
, &this->statements
)
2255 ast
->hir(instructions
, state
);
2258 state
->symbols
->pop_scope();
2260 /* Compound statements do not have r-values.
2266 * Evaluate the given exec_node (which should be an ast_node representing
2267 * a single array dimension) and return its integer value.
2270 process_array_size(exec_node
*node
,
2271 struct _mesa_glsl_parse_state
*state
)
2273 void *mem_ctx
= state
;
2275 exec_list dummy_instructions
;
2277 ast_node
*array_size
= exec_node_data(ast_node
, node
, link
);
2280 * Dimensions other than the outermost dimension can by unsized if they
2281 * are immediately sized by a constructor or initializer.
2283 if (((ast_expression
*)array_size
)->oper
== ast_unsized_array_dim
)
2286 ir_rvalue
*const ir
= array_size
->hir(& dummy_instructions
, state
);
2287 YYLTYPE loc
= array_size
->get_location();
2290 _mesa_glsl_error(& loc
, state
,
2291 "array size could not be resolved");
2295 if (!ir
->type
->is_integer_32()) {
2296 _mesa_glsl_error(& loc
, state
,
2297 "array size must be integer type");
2301 if (!ir
->type
->is_scalar()) {
2302 _mesa_glsl_error(& loc
, state
,
2303 "array size must be scalar type");
2307 ir_constant
*const size
= ir
->constant_expression_value(mem_ctx
);
2309 (state
->is_version(120, 300) &&
2310 array_size
->has_sequence_subexpression())) {
2311 _mesa_glsl_error(& loc
, state
, "array size must be a "
2312 "constant valued expression");
2316 if (size
->value
.i
[0] <= 0) {
2317 _mesa_glsl_error(& loc
, state
, "array size must be > 0");
2321 assert(size
->type
== ir
->type
);
2323 /* If the array size is const (and we've verified that
2324 * it is) then no instructions should have been emitted
2325 * when we converted it to HIR. If they were emitted,
2326 * then either the array size isn't const after all, or
2327 * we are emitting unnecessary instructions.
2329 assert(dummy_instructions
.is_empty());
2331 return size
->value
.u
[0];
2334 static const glsl_type
*
2335 process_array_type(YYLTYPE
*loc
, const glsl_type
*base
,
2336 ast_array_specifier
*array_specifier
,
2337 struct _mesa_glsl_parse_state
*state
)
2339 const glsl_type
*array_type
= base
;
2341 if (array_specifier
!= NULL
) {
2342 if (base
->is_array()) {
2344 /* From page 19 (page 25) of the GLSL 1.20 spec:
2346 * "Only one-dimensional arrays may be declared."
2348 if (!state
->check_arrays_of_arrays_allowed(loc
)) {
2349 return glsl_type::error_type
;
2353 for (exec_node
*node
= array_specifier
->array_dimensions
.get_tail_raw();
2354 !node
->is_head_sentinel(); node
= node
->prev
) {
2355 unsigned array_size
= process_array_size(node
, state
);
2356 array_type
= glsl_type::get_array_instance(array_type
, array_size
);
2364 precision_qualifier_allowed(const glsl_type
*type
)
2366 /* Precision qualifiers apply to floating point, integer and opaque
2369 * Section 4.5.2 (Precision Qualifiers) of the GLSL 1.30 spec says:
2370 * "Any floating point or any integer declaration can have the type
2371 * preceded by one of these precision qualifiers [...] Literal
2372 * constants do not have precision qualifiers. Neither do Boolean
2375 * Section 4.5 (Precision and Precision Qualifiers) of the GLSL 1.30
2378 * "Precision qualifiers are added for code portability with OpenGL
2379 * ES, not for functionality. They have the same syntax as in OpenGL
2382 * Section 8 (Built-In Functions) of the GLSL ES 1.00 spec says:
2384 * "uniform lowp sampler2D sampler;
2387 * lowp vec4 col = texture2D (sampler, coord);
2388 * // texture2D returns lowp"
2390 * From this, we infer that GLSL 1.30 (and later) should allow precision
2391 * qualifiers on sampler types just like float and integer types.
2393 const glsl_type
*const t
= type
->without_array();
2395 return (t
->is_float() || t
->is_integer_32() || t
->contains_opaque()) &&
2400 ast_type_specifier::glsl_type(const char **name
,
2401 struct _mesa_glsl_parse_state
*state
) const
2403 const struct glsl_type
*type
;
2405 if (this->type
!= NULL
)
2408 type
= structure
->type
;
2410 type
= state
->symbols
->get_type(this->type_name
);
2411 *name
= this->type_name
;
2413 YYLTYPE loc
= this->get_location();
2414 type
= process_array_type(&loc
, type
, this->array_specifier
, state
);
2420 * From the OpenGL ES 3.0 spec, 4.5.4 Default Precision Qualifiers:
2422 * "The precision statement
2424 * precision precision-qualifier type;
2426 * can be used to establish a default precision qualifier. The type field can
2427 * be either int or float or any of the sampler types, (...) If type is float,
2428 * the directive applies to non-precision-qualified floating point type
2429 * (scalar, vector, and matrix) declarations. If type is int, the directive
2430 * applies to all non-precision-qualified integer type (scalar, vector, signed,
2431 * and unsigned) declarations."
2433 * We use the symbol table to keep the values of the default precisions for
2434 * each 'type' in each scope and we use the 'type' string from the precision
2435 * statement as key in the symbol table. When we want to retrieve the default
2436 * precision associated with a given glsl_type we need to know the type string
2437 * associated with it. This is what this function returns.
2440 get_type_name_for_precision_qualifier(const glsl_type
*type
)
2442 switch (type
->base_type
) {
2443 case GLSL_TYPE_FLOAT
:
2445 case GLSL_TYPE_UINT
:
2448 case GLSL_TYPE_ATOMIC_UINT
:
2449 return "atomic_uint";
2450 case GLSL_TYPE_IMAGE
:
2452 case GLSL_TYPE_SAMPLER
: {
2453 const unsigned type_idx
=
2454 type
->sampler_array
+ 2 * type
->sampler_shadow
;
2455 const unsigned offset
= type
->is_sampler() ? 0 : 4;
2456 assert(type_idx
< 4);
2457 switch (type
->sampled_type
) {
2458 case GLSL_TYPE_FLOAT
:
2459 switch (type
->sampler_dimensionality
) {
2460 case GLSL_SAMPLER_DIM_1D
: {
2461 assert(type
->is_sampler());
2462 static const char *const names
[4] = {
2463 "sampler1D", "sampler1DArray",
2464 "sampler1DShadow", "sampler1DArrayShadow"
2466 return names
[type_idx
];
2468 case GLSL_SAMPLER_DIM_2D
: {
2469 static const char *const names
[8] = {
2470 "sampler2D", "sampler2DArray",
2471 "sampler2DShadow", "sampler2DArrayShadow",
2472 "image2D", "image2DArray", NULL
, NULL
2474 return names
[offset
+ type_idx
];
2476 case GLSL_SAMPLER_DIM_3D
: {
2477 static const char *const names
[8] = {
2478 "sampler3D", NULL
, NULL
, NULL
,
2479 "image3D", NULL
, NULL
, NULL
2481 return names
[offset
+ type_idx
];
2483 case GLSL_SAMPLER_DIM_CUBE
: {
2484 static const char *const names
[8] = {
2485 "samplerCube", "samplerCubeArray",
2486 "samplerCubeShadow", "samplerCubeArrayShadow",
2487 "imageCube", NULL
, NULL
, NULL
2489 return names
[offset
+ type_idx
];
2491 case GLSL_SAMPLER_DIM_MS
: {
2492 assert(type
->is_sampler());
2493 static const char *const names
[4] = {
2494 "sampler2DMS", "sampler2DMSArray", NULL
, NULL
2496 return names
[type_idx
];
2498 case GLSL_SAMPLER_DIM_RECT
: {
2499 assert(type
->is_sampler());
2500 static const char *const names
[4] = {
2501 "samplerRect", NULL
, "samplerRectShadow", NULL
2503 return names
[type_idx
];
2505 case GLSL_SAMPLER_DIM_BUF
: {
2506 static const char *const names
[8] = {
2507 "samplerBuffer", NULL
, NULL
, NULL
,
2508 "imageBuffer", NULL
, NULL
, NULL
2510 return names
[offset
+ type_idx
];
2512 case GLSL_SAMPLER_DIM_EXTERNAL
: {
2513 assert(type
->is_sampler());
2514 static const char *const names
[4] = {
2515 "samplerExternalOES", NULL
, NULL
, NULL
2517 return names
[type_idx
];
2520 unreachable("Unsupported sampler/image dimensionality");
2521 } /* sampler/image float dimensionality */
2524 switch (type
->sampler_dimensionality
) {
2525 case GLSL_SAMPLER_DIM_1D
: {
2526 assert(type
->is_sampler());
2527 static const char *const names
[4] = {
2528 "isampler1D", "isampler1DArray", NULL
, NULL
2530 return names
[type_idx
];
2532 case GLSL_SAMPLER_DIM_2D
: {
2533 static const char *const names
[8] = {
2534 "isampler2D", "isampler2DArray", NULL
, NULL
,
2535 "iimage2D", "iimage2DArray", NULL
, NULL
2537 return names
[offset
+ type_idx
];
2539 case GLSL_SAMPLER_DIM_3D
: {
2540 static const char *const names
[8] = {
2541 "isampler3D", NULL
, NULL
, NULL
,
2542 "iimage3D", NULL
, NULL
, NULL
2544 return names
[offset
+ type_idx
];
2546 case GLSL_SAMPLER_DIM_CUBE
: {
2547 static const char *const names
[8] = {
2548 "isamplerCube", "isamplerCubeArray", NULL
, NULL
,
2549 "iimageCube", NULL
, NULL
, NULL
2551 return names
[offset
+ type_idx
];
2553 case GLSL_SAMPLER_DIM_MS
: {
2554 assert(type
->is_sampler());
2555 static const char *const names
[4] = {
2556 "isampler2DMS", "isampler2DMSArray", NULL
, NULL
2558 return names
[type_idx
];
2560 case GLSL_SAMPLER_DIM_RECT
: {
2561 assert(type
->is_sampler());
2562 static const char *const names
[4] = {
2563 "isamplerRect", NULL
, "isamplerRectShadow", NULL
2565 return names
[type_idx
];
2567 case GLSL_SAMPLER_DIM_BUF
: {
2568 static const char *const names
[8] = {
2569 "isamplerBuffer", NULL
, NULL
, NULL
,
2570 "iimageBuffer", NULL
, NULL
, NULL
2572 return names
[offset
+ type_idx
];
2575 unreachable("Unsupported isampler/iimage dimensionality");
2576 } /* sampler/image int dimensionality */
2578 case GLSL_TYPE_UINT
:
2579 switch (type
->sampler_dimensionality
) {
2580 case GLSL_SAMPLER_DIM_1D
: {
2581 assert(type
->is_sampler());
2582 static const char *const names
[4] = {
2583 "usampler1D", "usampler1DArray", NULL
, NULL
2585 return names
[type_idx
];
2587 case GLSL_SAMPLER_DIM_2D
: {
2588 static const char *const names
[8] = {
2589 "usampler2D", "usampler2DArray", NULL
, NULL
,
2590 "uimage2D", "uimage2DArray", NULL
, NULL
2592 return names
[offset
+ type_idx
];
2594 case GLSL_SAMPLER_DIM_3D
: {
2595 static const char *const names
[8] = {
2596 "usampler3D", NULL
, NULL
, NULL
,
2597 "uimage3D", NULL
, NULL
, NULL
2599 return names
[offset
+ type_idx
];
2601 case GLSL_SAMPLER_DIM_CUBE
: {
2602 static const char *const names
[8] = {
2603 "usamplerCube", "usamplerCubeArray", NULL
, NULL
,
2604 "uimageCube", NULL
, NULL
, NULL
2606 return names
[offset
+ type_idx
];
2608 case GLSL_SAMPLER_DIM_MS
: {
2609 assert(type
->is_sampler());
2610 static const char *const names
[4] = {
2611 "usampler2DMS", "usampler2DMSArray", NULL
, NULL
2613 return names
[type_idx
];
2615 case GLSL_SAMPLER_DIM_RECT
: {
2616 assert(type
->is_sampler());
2617 static const char *const names
[4] = {
2618 "usamplerRect", NULL
, "usamplerRectShadow", NULL
2620 return names
[type_idx
];
2622 case GLSL_SAMPLER_DIM_BUF
: {
2623 static const char *const names
[8] = {
2624 "usamplerBuffer", NULL
, NULL
, NULL
,
2625 "uimageBuffer", NULL
, NULL
, NULL
2627 return names
[offset
+ type_idx
];
2630 unreachable("Unsupported usampler/uimage dimensionality");
2631 } /* sampler/image uint dimensionality */
2634 unreachable("Unsupported sampler/image type");
2635 } /* sampler/image type */
2637 } /* GLSL_TYPE_SAMPLER/GLSL_TYPE_IMAGE */
2640 unreachable("Unsupported type");
2645 select_gles_precision(unsigned qual_precision
,
2646 const glsl_type
*type
,
2647 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
2649 /* Precision qualifiers do not have any meaning in Desktop GLSL.
2650 * In GLES we take the precision from the type qualifier if present,
2651 * otherwise, if the type of the variable allows precision qualifiers at
2652 * all, we look for the default precision qualifier for that type in the
2655 assert(state
->es_shader
);
2657 unsigned precision
= GLSL_PRECISION_NONE
;
2658 if (qual_precision
) {
2659 precision
= qual_precision
;
2660 } else if (precision_qualifier_allowed(type
)) {
2661 const char *type_name
=
2662 get_type_name_for_precision_qualifier(type
->without_array());
2663 assert(type_name
!= NULL
);
2666 state
->symbols
->get_default_precision_qualifier(type_name
);
2667 if (precision
== ast_precision_none
) {
2668 _mesa_glsl_error(loc
, state
,
2669 "No precision specified in this scope for type `%s'",
2675 /* Section 4.1.7.3 (Atomic Counters) of the GLSL ES 3.10 spec says:
2677 * "The default precision of all atomic types is highp. It is an error to
2678 * declare an atomic type with a different precision or to specify the
2679 * default precision for an atomic type to be lowp or mediump."
2681 if (type
->is_atomic_uint() && precision
!= ast_precision_high
) {
2682 _mesa_glsl_error(loc
, state
,
2683 "atomic_uint can only have highp precision qualifier");
2690 ast_fully_specified_type::glsl_type(const char **name
,
2691 struct _mesa_glsl_parse_state
*state
) const
2693 return this->specifier
->glsl_type(name
, state
);
2697 * Determine whether a toplevel variable declaration declares a varying. This
2698 * function operates by examining the variable's mode and the shader target,
2699 * so it correctly identifies linkage variables regardless of whether they are
2700 * declared using the deprecated "varying" syntax or the new "in/out" syntax.
2702 * Passing a non-toplevel variable declaration (e.g. a function parameter) to
2703 * this function will produce undefined results.
2706 is_varying_var(ir_variable
*var
, gl_shader_stage target
)
2709 case MESA_SHADER_VERTEX
:
2710 return var
->data
.mode
== ir_var_shader_out
;
2711 case MESA_SHADER_FRAGMENT
:
2712 return var
->data
.mode
== ir_var_shader_in
||
2713 (var
->data
.mode
== ir_var_system_value
&&
2714 var
->data
.location
== SYSTEM_VALUE_FRAG_COORD
);
2716 return var
->data
.mode
== ir_var_shader_out
|| var
->data
.mode
== ir_var_shader_in
;
2721 is_allowed_invariant(ir_variable
*var
, struct _mesa_glsl_parse_state
*state
)
2723 if (is_varying_var(var
, state
->stage
))
2726 /* From Section 4.6.1 ("The Invariant Qualifier") GLSL 1.20 spec:
2727 * "Only variables output from a vertex shader can be candidates
2730 if (!state
->is_version(130, 100))
2734 * Later specs remove this language - so allowed invariant
2735 * on fragment shader outputs as well.
2737 if (state
->stage
== MESA_SHADER_FRAGMENT
&&
2738 var
->data
.mode
== ir_var_shader_out
)
2744 * Matrix layout qualifiers are only allowed on certain types
2747 validate_matrix_layout_for_type(struct _mesa_glsl_parse_state
*state
,
2749 const glsl_type
*type
,
2752 if (var
&& !var
->is_in_buffer_block()) {
2753 /* Layout qualifiers may only apply to interface blocks and fields in
2756 _mesa_glsl_error(loc
, state
,
2757 "uniform block layout qualifiers row_major and "
2758 "column_major may not be applied to variables "
2759 "outside of uniform blocks");
2760 } else if (!type
->without_array()->is_matrix()) {
2761 /* The OpenGL ES 3.0 conformance tests did not originally allow
2762 * matrix layout qualifiers on non-matrices. However, the OpenGL
2763 * 4.4 and OpenGL ES 3.0 (revision TBD) specifications were
2764 * amended to specifically allow these layouts on all types. Emit
2765 * a warning so that people know their code may not be portable.
2767 _mesa_glsl_warning(loc
, state
,
2768 "uniform block layout qualifiers row_major and "
2769 "column_major applied to non-matrix types may "
2770 "be rejected by older compilers");
2775 validate_xfb_buffer_qualifier(YYLTYPE
*loc
,
2776 struct _mesa_glsl_parse_state
*state
,
2777 unsigned xfb_buffer
) {
2778 if (xfb_buffer
>= state
->Const
.MaxTransformFeedbackBuffers
) {
2779 _mesa_glsl_error(loc
, state
,
2780 "invalid xfb_buffer specified %d is larger than "
2781 "MAX_TRANSFORM_FEEDBACK_BUFFERS - 1 (%d).",
2783 state
->Const
.MaxTransformFeedbackBuffers
- 1);
2790 /* From the ARB_enhanced_layouts spec:
2792 * "Variables and block members qualified with *xfb_offset* can be
2793 * scalars, vectors, matrices, structures, and (sized) arrays of these.
2794 * The offset must be a multiple of the size of the first component of
2795 * the first qualified variable or block member, or a compile-time error
2796 * results. Further, if applied to an aggregate containing a double,
2797 * the offset must also be a multiple of 8, and the space taken in the
2798 * buffer will be a multiple of 8.
2801 validate_xfb_offset_qualifier(YYLTYPE
*loc
,
2802 struct _mesa_glsl_parse_state
*state
,
2803 int xfb_offset
, const glsl_type
*type
,
2804 unsigned component_size
) {
2805 const glsl_type
*t_without_array
= type
->without_array();
2807 if (xfb_offset
!= -1 && type
->is_unsized_array()) {
2808 _mesa_glsl_error(loc
, state
,
2809 "xfb_offset can't be used with unsized arrays.");
2813 /* Make sure nested structs don't contain unsized arrays, and validate
2814 * any xfb_offsets on interface members.
2816 if (t_without_array
->is_struct() || t_without_array
->is_interface())
2817 for (unsigned int i
= 0; i
< t_without_array
->length
; i
++) {
2818 const glsl_type
*member_t
= t_without_array
->fields
.structure
[i
].type
;
2820 /* When the interface block doesn't have an xfb_offset qualifier then
2821 * we apply the component size rules at the member level.
2823 if (xfb_offset
== -1)
2824 component_size
= member_t
->contains_double() ? 8 : 4;
2826 int xfb_offset
= t_without_array
->fields
.structure
[i
].offset
;
2827 validate_xfb_offset_qualifier(loc
, state
, xfb_offset
, member_t
,
2831 /* Nested structs or interface block without offset may not have had an
2832 * offset applied yet so return.
2834 if (xfb_offset
== -1) {
2838 if (xfb_offset
% component_size
) {
2839 _mesa_glsl_error(loc
, state
,
2840 "invalid qualifier xfb_offset=%d must be a multiple "
2841 "of the first component size of the first qualified "
2842 "variable or block member. Or double if an aggregate "
2843 "that contains a double (%d).",
2844 xfb_offset
, component_size
);
2852 validate_stream_qualifier(YYLTYPE
*loc
, struct _mesa_glsl_parse_state
*state
,
2855 if (stream
>= state
->ctx
->Const
.MaxVertexStreams
) {
2856 _mesa_glsl_error(loc
, state
,
2857 "invalid stream specified %d is larger than "
2858 "MAX_VERTEX_STREAMS - 1 (%d).",
2859 stream
, state
->ctx
->Const
.MaxVertexStreams
- 1);
2867 apply_explicit_binding(struct _mesa_glsl_parse_state
*state
,
2870 const glsl_type
*type
,
2871 const ast_type_qualifier
*qual
)
2873 if (!qual
->flags
.q
.uniform
&& !qual
->flags
.q
.buffer
) {
2874 _mesa_glsl_error(loc
, state
,
2875 "the \"binding\" qualifier only applies to uniforms and "
2876 "shader storage buffer objects");
2880 unsigned qual_binding
;
2881 if (!process_qualifier_constant(state
, loc
, "binding", qual
->binding
,
2886 const struct gl_context
*const ctx
= state
->ctx
;
2887 unsigned elements
= type
->is_array() ? type
->arrays_of_arrays_size() : 1;
2888 unsigned max_index
= qual_binding
+ elements
- 1;
2889 const glsl_type
*base_type
= type
->without_array();
2891 if (base_type
->is_interface()) {
2892 /* UBOs. From page 60 of the GLSL 4.20 specification:
2893 * "If the binding point for any uniform block instance is less than zero,
2894 * or greater than or equal to the implementation-dependent maximum
2895 * number of uniform buffer bindings, a compilation error will occur.
2896 * When the binding identifier is used with a uniform block instanced as
2897 * an array of size N, all elements of the array from binding through
2898 * binding + N – 1 must be within this range."
2900 * The implementation-dependent maximum is GL_MAX_UNIFORM_BUFFER_BINDINGS.
2902 if (qual
->flags
.q
.uniform
&&
2903 max_index
>= ctx
->Const
.MaxUniformBufferBindings
) {
2904 _mesa_glsl_error(loc
, state
, "layout(binding = %u) for %d UBOs exceeds "
2905 "the maximum number of UBO binding points (%d)",
2906 qual_binding
, elements
,
2907 ctx
->Const
.MaxUniformBufferBindings
);
2911 /* SSBOs. From page 67 of the GLSL 4.30 specification:
2912 * "If the binding point for any uniform or shader storage block instance
2913 * is less than zero, or greater than or equal to the
2914 * implementation-dependent maximum number of uniform buffer bindings, a
2915 * compile-time error will occur. When the binding identifier is used
2916 * with a uniform or shader storage block instanced as an array of size
2917 * N, all elements of the array from binding through binding + N – 1 must
2918 * be within this range."
2920 if (qual
->flags
.q
.buffer
&&
2921 max_index
>= ctx
->Const
.MaxShaderStorageBufferBindings
) {
2922 _mesa_glsl_error(loc
, state
, "layout(binding = %u) for %d SSBOs exceeds "
2923 "the maximum number of SSBO binding points (%d)",
2924 qual_binding
, elements
,
2925 ctx
->Const
.MaxShaderStorageBufferBindings
);
2928 } else if (base_type
->is_sampler()) {
2929 /* Samplers. From page 63 of the GLSL 4.20 specification:
2930 * "If the binding is less than zero, or greater than or equal to the
2931 * implementation-dependent maximum supported number of units, a
2932 * compilation error will occur. When the binding identifier is used
2933 * with an array of size N, all elements of the array from binding
2934 * through binding + N - 1 must be within this range."
2936 unsigned limit
= ctx
->Const
.MaxCombinedTextureImageUnits
;
2938 if (max_index
>= limit
) {
2939 _mesa_glsl_error(loc
, state
, "layout(binding = %d) for %d samplers "
2940 "exceeds the maximum number of texture image units "
2941 "(%u)", qual_binding
, elements
, limit
);
2945 } else if (base_type
->contains_atomic()) {
2946 assert(ctx
->Const
.MaxAtomicBufferBindings
<= MAX_COMBINED_ATOMIC_BUFFERS
);
2947 if (qual_binding
>= ctx
->Const
.MaxAtomicBufferBindings
) {
2948 _mesa_glsl_error(loc
, state
, "layout(binding = %d) exceeds the "
2949 "maximum number of atomic counter buffer bindings "
2950 "(%u)", qual_binding
,
2951 ctx
->Const
.MaxAtomicBufferBindings
);
2955 } else if ((state
->is_version(420, 310) ||
2956 state
->ARB_shading_language_420pack_enable
) &&
2957 base_type
->is_image()) {
2958 assert(ctx
->Const
.MaxImageUnits
<= MAX_IMAGE_UNITS
);
2959 if (max_index
>= ctx
->Const
.MaxImageUnits
) {
2960 _mesa_glsl_error(loc
, state
, "Image binding %d exceeds the "
2961 "maximum number of image units (%d)", max_index
,
2962 ctx
->Const
.MaxImageUnits
);
2967 _mesa_glsl_error(loc
, state
,
2968 "the \"binding\" qualifier only applies to uniform "
2969 "blocks, storage blocks, opaque variables, or arrays "
2974 var
->data
.explicit_binding
= true;
2975 var
->data
.binding
= qual_binding
;
2981 validate_fragment_flat_interpolation_input(struct _mesa_glsl_parse_state
*state
,
2983 const glsl_interp_mode interpolation
,
2984 const struct glsl_type
*var_type
,
2985 ir_variable_mode mode
)
2987 if (state
->stage
!= MESA_SHADER_FRAGMENT
||
2988 interpolation
== INTERP_MODE_FLAT
||
2989 mode
!= ir_var_shader_in
)
2992 /* Integer fragment inputs must be qualified with 'flat'. In GLSL ES,
2993 * so must integer vertex outputs.
2995 * From section 4.3.4 ("Inputs") of the GLSL 1.50 spec:
2996 * "Fragment shader inputs that are signed or unsigned integers or
2997 * integer vectors must be qualified with the interpolation qualifier
3000 * From section 4.3.4 ("Input Variables") of the GLSL 3.00 ES spec:
3001 * "Fragment shader inputs that are, or contain, signed or unsigned
3002 * integers or integer vectors must be qualified with the
3003 * interpolation qualifier flat."
3005 * From section 4.3.6 ("Output Variables") of the GLSL 3.00 ES spec:
3006 * "Vertex shader outputs that are, or contain, signed or unsigned
3007 * integers or integer vectors must be qualified with the
3008 * interpolation qualifier flat."
3010 * Note that prior to GLSL 1.50, this requirement applied to vertex
3011 * outputs rather than fragment inputs. That creates problems in the
3012 * presence of geometry shaders, so we adopt the GLSL 1.50 rule for all
3013 * desktop GL shaders. For GLSL ES shaders, we follow the spec and
3014 * apply the restriction to both vertex outputs and fragment inputs.
3016 * Note also that the desktop GLSL specs are missing the text "or
3017 * contain"; this is presumably an oversight, since there is no
3018 * reasonable way to interpolate a fragment shader input that contains
3019 * an integer. See Khronos bug #15671.
3021 if ((state
->is_version(130, 300) || state
->EXT_gpu_shader4_enable
)
3022 && var_type
->contains_integer()) {
3023 _mesa_glsl_error(loc
, state
, "if a fragment input is (or contains) "
3024 "an integer, then it must be qualified with 'flat'");
3027 /* Double fragment inputs must be qualified with 'flat'.
3029 * From the "Overview" of the ARB_gpu_shader_fp64 extension spec:
3030 * "This extension does not support interpolation of double-precision
3031 * values; doubles used as fragment shader inputs must be qualified as
3034 * From section 4.3.4 ("Inputs") of the GLSL 4.00 spec:
3035 * "Fragment shader inputs that are signed or unsigned integers, integer
3036 * vectors, or any double-precision floating-point type must be
3037 * qualified with the interpolation qualifier flat."
3039 * Note that the GLSL specs are missing the text "or contain"; this is
3040 * presumably an oversight. See Khronos bug #15671.
3042 * The 'double' type does not exist in GLSL ES so far.
3044 if (state
->has_double()
3045 && var_type
->contains_double()) {
3046 _mesa_glsl_error(loc
, state
, "if a fragment input is (or contains) "
3047 "a double, then it must be qualified with 'flat'");
3050 /* Bindless sampler/image fragment inputs must be qualified with 'flat'.
3052 * From section 4.3.4 of the ARB_bindless_texture spec:
3054 * "(modify last paragraph, p. 35, allowing samplers and images as
3055 * fragment shader inputs) ... Fragment inputs can only be signed and
3056 * unsigned integers and integer vectors, floating point scalars,
3057 * floating-point vectors, matrices, sampler and image types, or arrays
3058 * or structures of these. Fragment shader inputs that are signed or
3059 * unsigned integers, integer vectors, or any double-precision floating-
3060 * point type, or any sampler or image type must be qualified with the
3061 * interpolation qualifier "flat"."
3063 if (state
->has_bindless()
3064 && (var_type
->contains_sampler() || var_type
->contains_image())) {
3065 _mesa_glsl_error(loc
, state
, "if a fragment input is (or contains) "
3066 "a bindless sampler (or image), then it must be "
3067 "qualified with 'flat'");
3072 validate_interpolation_qualifier(struct _mesa_glsl_parse_state
*state
,
3074 const glsl_interp_mode interpolation
,
3075 const struct ast_type_qualifier
*qual
,
3076 const struct glsl_type
*var_type
,
3077 ir_variable_mode mode
)
3079 /* Interpolation qualifiers can only apply to shader inputs or outputs, but
3080 * not to vertex shader inputs nor fragment shader outputs.
3082 * From section 4.3 ("Storage Qualifiers") of the GLSL 1.30 spec:
3083 * "Outputs from a vertex shader (out) and inputs to a fragment
3084 * shader (in) can be further qualified with one or more of these
3085 * interpolation qualifiers"
3087 * "These interpolation qualifiers may only precede the qualifiers in,
3088 * centroid in, out, or centroid out in a declaration. They do not apply
3089 * to the deprecated storage qualifiers varying or centroid
3090 * varying. They also do not apply to inputs into a vertex shader or
3091 * outputs from a fragment shader."
3093 * From section 4.3 ("Storage Qualifiers") of the GLSL ES 3.00 spec:
3094 * "Outputs from a shader (out) and inputs to a shader (in) can be
3095 * further qualified with one of these interpolation qualifiers."
3097 * "These interpolation qualifiers may only precede the qualifiers
3098 * in, centroid in, out, or centroid out in a declaration. They do
3099 * not apply to inputs into a vertex shader or outputs from a
3102 if ((state
->is_version(130, 300) || state
->EXT_gpu_shader4_enable
)
3103 && interpolation
!= INTERP_MODE_NONE
) {
3104 const char *i
= interpolation_string(interpolation
);
3105 if (mode
!= ir_var_shader_in
&& mode
!= ir_var_shader_out
)
3106 _mesa_glsl_error(loc
, state
,
3107 "interpolation qualifier `%s' can only be applied to "
3108 "shader inputs or outputs.", i
);
3110 switch (state
->stage
) {
3111 case MESA_SHADER_VERTEX
:
3112 if (mode
== ir_var_shader_in
) {
3113 _mesa_glsl_error(loc
, state
,
3114 "interpolation qualifier '%s' cannot be applied to "
3115 "vertex shader inputs", i
);
3118 case MESA_SHADER_FRAGMENT
:
3119 if (mode
== ir_var_shader_out
) {
3120 _mesa_glsl_error(loc
, state
,
3121 "interpolation qualifier '%s' cannot be applied to "
3122 "fragment shader outputs", i
);
3130 /* Interpolation qualifiers cannot be applied to 'centroid' and
3131 * 'centroid varying'.
3133 * From section 4.3 ("Storage Qualifiers") of the GLSL 1.30 spec:
3134 * "interpolation qualifiers may only precede the qualifiers in,
3135 * centroid in, out, or centroid out in a declaration. They do not apply
3136 * to the deprecated storage qualifiers varying or centroid varying."
3138 * These deprecated storage qualifiers do not exist in GLSL ES 3.00.
3140 * GL_EXT_gpu_shader4 allows this.
3142 if (state
->is_version(130, 0) && !state
->EXT_gpu_shader4_enable
3143 && interpolation
!= INTERP_MODE_NONE
3144 && qual
->flags
.q
.varying
) {
3146 const char *i
= interpolation_string(interpolation
);
3148 if (qual
->flags
.q
.centroid
)
3149 s
= "centroid varying";
3153 _mesa_glsl_error(loc
, state
,
3154 "qualifier '%s' cannot be applied to the "
3155 "deprecated storage qualifier '%s'", i
, s
);
3158 validate_fragment_flat_interpolation_input(state
, loc
, interpolation
,
3162 static glsl_interp_mode
3163 interpret_interpolation_qualifier(const struct ast_type_qualifier
*qual
,
3164 const struct glsl_type
*var_type
,
3165 ir_variable_mode mode
,
3166 struct _mesa_glsl_parse_state
*state
,
3169 glsl_interp_mode interpolation
;
3170 if (qual
->flags
.q
.flat
)
3171 interpolation
= INTERP_MODE_FLAT
;
3172 else if (qual
->flags
.q
.noperspective
)
3173 interpolation
= INTERP_MODE_NOPERSPECTIVE
;
3174 else if (qual
->flags
.q
.smooth
)
3175 interpolation
= INTERP_MODE_SMOOTH
;
3177 interpolation
= INTERP_MODE_NONE
;
3179 validate_interpolation_qualifier(state
, loc
,
3181 qual
, var_type
, mode
);
3183 return interpolation
;
3188 apply_explicit_location(const struct ast_type_qualifier
*qual
,
3190 struct _mesa_glsl_parse_state
*state
,
3195 unsigned qual_location
;
3196 if (!process_qualifier_constant(state
, loc
, "location", qual
->location
,
3201 /* Checks for GL_ARB_explicit_uniform_location. */
3202 if (qual
->flags
.q
.uniform
) {
3203 if (!state
->check_explicit_uniform_location_allowed(loc
, var
))
3206 const struct gl_context
*const ctx
= state
->ctx
;
3207 unsigned max_loc
= qual_location
+ var
->type
->uniform_locations() - 1;
3209 if (max_loc
>= ctx
->Const
.MaxUserAssignableUniformLocations
) {
3210 _mesa_glsl_error(loc
, state
, "location(s) consumed by uniform %s "
3211 ">= MAX_UNIFORM_LOCATIONS (%u)", var
->name
,
3212 ctx
->Const
.MaxUserAssignableUniformLocations
);
3216 var
->data
.explicit_location
= true;
3217 var
->data
.location
= qual_location
;
3221 /* Between GL_ARB_explicit_attrib_location an
3222 * GL_ARB_separate_shader_objects, the inputs and outputs of any shader
3223 * stage can be assigned explicit locations. The checking here associates
3224 * the correct extension with the correct stage's input / output:
3228 * vertex explicit_loc sso
3229 * tess control sso sso
3232 * fragment sso explicit_loc
3234 switch (state
->stage
) {
3235 case MESA_SHADER_VERTEX
:
3236 if (var
->data
.mode
== ir_var_shader_in
) {
3237 if (!state
->check_explicit_attrib_location_allowed(loc
, var
))
3243 if (var
->data
.mode
== ir_var_shader_out
) {
3244 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
3253 case MESA_SHADER_TESS_CTRL
:
3254 case MESA_SHADER_TESS_EVAL
:
3255 case MESA_SHADER_GEOMETRY
:
3256 if (var
->data
.mode
== ir_var_shader_in
|| var
->data
.mode
== ir_var_shader_out
) {
3257 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
3266 case MESA_SHADER_FRAGMENT
:
3267 if (var
->data
.mode
== ir_var_shader_in
) {
3268 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
3274 if (var
->data
.mode
== ir_var_shader_out
) {
3275 if (!state
->check_explicit_attrib_location_allowed(loc
, var
))
3284 case MESA_SHADER_COMPUTE
:
3285 _mesa_glsl_error(loc
, state
,
3286 "compute shader variables cannot be given "
3287 "explicit locations");
3295 _mesa_glsl_error(loc
, state
,
3296 "%s cannot be given an explicit location in %s shader",
3298 _mesa_shader_stage_to_string(state
->stage
));
3300 var
->data
.explicit_location
= true;
3302 switch (state
->stage
) {
3303 case MESA_SHADER_VERTEX
:
3304 var
->data
.location
= (var
->data
.mode
== ir_var_shader_in
)
3305 ? (qual_location
+ VERT_ATTRIB_GENERIC0
)
3306 : (qual_location
+ VARYING_SLOT_VAR0
);
3309 case MESA_SHADER_TESS_CTRL
:
3310 case MESA_SHADER_TESS_EVAL
:
3311 case MESA_SHADER_GEOMETRY
:
3312 if (var
->data
.patch
)
3313 var
->data
.location
= qual_location
+ VARYING_SLOT_PATCH0
;
3315 var
->data
.location
= qual_location
+ VARYING_SLOT_VAR0
;
3318 case MESA_SHADER_FRAGMENT
:
3319 var
->data
.location
= (var
->data
.mode
== ir_var_shader_out
)
3320 ? (qual_location
+ FRAG_RESULT_DATA0
)
3321 : (qual_location
+ VARYING_SLOT_VAR0
);
3324 assert(!"Unexpected shader type");
3328 /* Check if index was set for the uniform instead of the function */
3329 if (qual
->flags
.q
.explicit_index
&& qual
->is_subroutine_decl()) {
3330 _mesa_glsl_error(loc
, state
, "an index qualifier can only be "
3331 "used with subroutine functions");
3335 unsigned qual_index
;
3336 if (qual
->flags
.q
.explicit_index
&&
3337 process_qualifier_constant(state
, loc
, "index", qual
->index
,
3339 /* From the GLSL 4.30 specification, section 4.4.2 (Output
3340 * Layout Qualifiers):
3342 * "It is also a compile-time error if a fragment shader
3343 * sets a layout index to less than 0 or greater than 1."
3345 * Older specifications don't mandate a behavior; we take
3346 * this as a clarification and always generate the error.
3348 if (qual_index
> 1) {
3349 _mesa_glsl_error(loc
, state
,
3350 "explicit index may only be 0 or 1");
3352 var
->data
.explicit_index
= true;
3353 var
->data
.index
= qual_index
;
3360 validate_storage_for_sampler_image_types(ir_variable
*var
,
3361 struct _mesa_glsl_parse_state
*state
,
3364 /* From section 4.1.7 of the GLSL 4.40 spec:
3366 * "[Opaque types] can only be declared as function
3367 * parameters or uniform-qualified variables."
3369 * From section 4.1.7 of the ARB_bindless_texture spec:
3371 * "Samplers may be declared as shader inputs and outputs, as uniform
3372 * variables, as temporary variables, and as function parameters."
3374 * From section 4.1.X of the ARB_bindless_texture spec:
3376 * "Images may be declared as shader inputs and outputs, as uniform
3377 * variables, as temporary variables, and as function parameters."
3379 if (state
->has_bindless()) {
3380 if (var
->data
.mode
!= ir_var_auto
&&
3381 var
->data
.mode
!= ir_var_uniform
&&
3382 var
->data
.mode
!= ir_var_shader_in
&&
3383 var
->data
.mode
!= ir_var_shader_out
&&
3384 var
->data
.mode
!= ir_var_function_in
&&
3385 var
->data
.mode
!= ir_var_function_out
&&
3386 var
->data
.mode
!= ir_var_function_inout
) {
3387 _mesa_glsl_error(loc
, state
, "bindless image/sampler variables may "
3388 "only be declared as shader inputs and outputs, as "
3389 "uniform variables, as temporary variables and as "
3390 "function parameters");
3394 if (var
->data
.mode
!= ir_var_uniform
&&
3395 var
->data
.mode
!= ir_var_function_in
) {
3396 _mesa_glsl_error(loc
, state
, "image/sampler variables may only be "
3397 "declared as function parameters or "
3398 "uniform-qualified global variables");
3406 validate_memory_qualifier_for_type(struct _mesa_glsl_parse_state
*state
,
3408 const struct ast_type_qualifier
*qual
,
3409 const glsl_type
*type
)
3411 /* From Section 4.10 (Memory Qualifiers) of the GLSL 4.50 spec:
3413 * "Memory qualifiers are only supported in the declarations of image
3414 * variables, buffer variables, and shader storage blocks; it is an error
3415 * to use such qualifiers in any other declarations.
3417 if (!type
->is_image() && !qual
->flags
.q
.buffer
) {
3418 if (qual
->flags
.q
.read_only
||
3419 qual
->flags
.q
.write_only
||
3420 qual
->flags
.q
.coherent
||
3421 qual
->flags
.q
._volatile
||
3422 qual
->flags
.q
.restrict_flag
) {
3423 _mesa_glsl_error(loc
, state
, "memory qualifiers may only be applied "
3424 "in the declarations of image variables, buffer "
3425 "variables, and shader storage blocks");
3433 validate_image_format_qualifier_for_type(struct _mesa_glsl_parse_state
*state
,
3435 const struct ast_type_qualifier
*qual
,
3436 const glsl_type
*type
)
3438 /* From section 4.4.6.2 (Format Layout Qualifiers) of the GLSL 4.50 spec:
3440 * "Format layout qualifiers can be used on image variable declarations
3441 * (those declared with a basic type having “image ” in its keyword)."
3443 if (!type
->is_image() && qual
->flags
.q
.explicit_image_format
) {
3444 _mesa_glsl_error(loc
, state
, "format layout qualifiers may only be "
3445 "applied to images");
3452 apply_image_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
3454 struct _mesa_glsl_parse_state
*state
,
3457 const glsl_type
*base_type
= var
->type
->without_array();
3459 if (!validate_image_format_qualifier_for_type(state
, loc
, qual
, base_type
) ||
3460 !validate_memory_qualifier_for_type(state
, loc
, qual
, base_type
))
3463 if (!base_type
->is_image())
3466 if (!validate_storage_for_sampler_image_types(var
, state
, loc
))
3469 var
->data
.memory_read_only
|= qual
->flags
.q
.read_only
;
3470 var
->data
.memory_write_only
|= qual
->flags
.q
.write_only
;
3471 var
->data
.memory_coherent
|= qual
->flags
.q
.coherent
;
3472 var
->data
.memory_volatile
|= qual
->flags
.q
._volatile
;
3473 var
->data
.memory_restrict
|= qual
->flags
.q
.restrict_flag
;
3475 if (qual
->flags
.q
.explicit_image_format
) {
3476 if (var
->data
.mode
== ir_var_function_in
) {
3477 _mesa_glsl_error(loc
, state
, "format qualifiers cannot be used on "
3478 "image function parameters");
3481 if (qual
->image_base_type
!= base_type
->sampled_type
) {
3482 _mesa_glsl_error(loc
, state
, "format qualifier doesn't match the base "
3483 "data type of the image");
3486 var
->data
.image_format
= qual
->image_format
;
3487 } else if (state
->has_image_load_formatted()) {
3488 if (var
->data
.mode
== ir_var_uniform
&&
3489 state
->EXT_shader_image_load_formatted_warn
) {
3490 _mesa_glsl_warning(loc
, state
, "GL_EXT_image_load_formatted used");
3493 if (var
->data
.mode
== ir_var_uniform
) {
3494 if (state
->es_shader
||
3495 !(state
->is_version(420, 310) || state
->ARB_shader_image_load_store_enable
)) {
3496 _mesa_glsl_error(loc
, state
, "all image uniforms must have a "
3497 "format layout qualifier");
3498 } else if (!qual
->flags
.q
.write_only
) {
3499 _mesa_glsl_error(loc
, state
, "image uniforms not qualified with "
3500 "`writeonly' must have a format layout qualifier");
3503 var
->data
.image_format
= PIPE_FORMAT_NONE
;
3506 /* From page 70 of the GLSL ES 3.1 specification:
3508 * "Except for image variables qualified with the format qualifiers r32f,
3509 * r32i, and r32ui, image variables must specify either memory qualifier
3510 * readonly or the memory qualifier writeonly."
3512 if (state
->es_shader
&&
3513 var
->data
.image_format
!= PIPE_FORMAT_R32_FLOAT
&&
3514 var
->data
.image_format
!= PIPE_FORMAT_R32_SINT
&&
3515 var
->data
.image_format
!= PIPE_FORMAT_R32_UINT
&&
3516 !var
->data
.memory_read_only
&&
3517 !var
->data
.memory_write_only
) {
3518 _mesa_glsl_error(loc
, state
, "image variables of format other than r32f, "
3519 "r32i or r32ui must be qualified `readonly' or "
3524 static inline const char*
3525 get_layout_qualifier_string(bool origin_upper_left
, bool pixel_center_integer
)
3527 if (origin_upper_left
&& pixel_center_integer
)
3528 return "origin_upper_left, pixel_center_integer";
3529 else if (origin_upper_left
)
3530 return "origin_upper_left";
3531 else if (pixel_center_integer
)
3532 return "pixel_center_integer";
3538 is_conflicting_fragcoord_redeclaration(struct _mesa_glsl_parse_state
*state
,
3539 const struct ast_type_qualifier
*qual
)
3541 /* If gl_FragCoord was previously declared, and the qualifiers were
3542 * different in any way, return true.
3544 if (state
->fs_redeclares_gl_fragcoord
) {
3545 return (state
->fs_pixel_center_integer
!= qual
->flags
.q
.pixel_center_integer
3546 || state
->fs_origin_upper_left
!= qual
->flags
.q
.origin_upper_left
);
3553 validate_array_dimensions(const glsl_type
*t
,
3554 struct _mesa_glsl_parse_state
*state
,
3556 if (t
->is_array()) {
3557 t
= t
->fields
.array
;
3558 while (t
->is_array()) {
3559 if (t
->is_unsized_array()) {
3560 _mesa_glsl_error(loc
, state
,
3561 "only the outermost array dimension can "
3566 t
= t
->fields
.array
;
3572 apply_bindless_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
3574 struct _mesa_glsl_parse_state
*state
,
3577 bool has_local_qualifiers
= qual
->flags
.q
.bindless_sampler
||
3578 qual
->flags
.q
.bindless_image
||
3579 qual
->flags
.q
.bound_sampler
||
3580 qual
->flags
.q
.bound_image
;
3582 /* The ARB_bindless_texture spec says:
3584 * "Modify Section 4.4.6 Opaque-Uniform Layout Qualifiers of the GLSL 4.30
3587 * "If these layout qualifiers are applied to other types of default block
3588 * uniforms, or variables with non-uniform storage, a compile-time error
3589 * will be generated."
3591 if (has_local_qualifiers
&& !qual
->flags
.q
.uniform
) {
3592 _mesa_glsl_error(loc
, state
, "ARB_bindless_texture layout qualifiers "
3593 "can only be applied to default block uniforms or "
3594 "variables with uniform storage");
3598 /* The ARB_bindless_texture spec doesn't state anything in this situation,
3599 * but it makes sense to only allow bindless_sampler/bound_sampler for
3600 * sampler types, and respectively bindless_image/bound_image for image
3603 if ((qual
->flags
.q
.bindless_sampler
|| qual
->flags
.q
.bound_sampler
) &&
3604 !var
->type
->contains_sampler()) {
3605 _mesa_glsl_error(loc
, state
, "bindless_sampler or bound_sampler can only "
3606 "be applied to sampler types");
3610 if ((qual
->flags
.q
.bindless_image
|| qual
->flags
.q
.bound_image
) &&
3611 !var
->type
->contains_image()) {
3612 _mesa_glsl_error(loc
, state
, "bindless_image or bound_image can only be "
3613 "applied to image types");
3617 /* The bindless_sampler/bindless_image (and respectively
3618 * bound_sampler/bound_image) layout qualifiers can be set at global and at
3621 if (var
->type
->contains_sampler() || var
->type
->contains_image()) {
3622 var
->data
.bindless
= qual
->flags
.q
.bindless_sampler
||
3623 qual
->flags
.q
.bindless_image
||
3624 state
->bindless_sampler_specified
||
3625 state
->bindless_image_specified
;
3627 var
->data
.bound
= qual
->flags
.q
.bound_sampler
||
3628 qual
->flags
.q
.bound_image
||
3629 state
->bound_sampler_specified
||
3630 state
->bound_image_specified
;
3635 apply_layout_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
3637 struct _mesa_glsl_parse_state
*state
,
3640 if (var
->name
!= NULL
&& strcmp(var
->name
, "gl_FragCoord") == 0) {
3642 /* Section 4.3.8.1, page 39 of GLSL 1.50 spec says:
3644 * "Within any shader, the first redeclarations of gl_FragCoord
3645 * must appear before any use of gl_FragCoord."
3647 * Generate a compiler error if above condition is not met by the
3650 ir_variable
*earlier
= state
->symbols
->get_variable("gl_FragCoord");
3651 if (earlier
!= NULL
&&
3652 earlier
->data
.used
&&
3653 !state
->fs_redeclares_gl_fragcoord
) {
3654 _mesa_glsl_error(loc
, state
,
3655 "gl_FragCoord used before its first redeclaration "
3656 "in fragment shader");
3659 /* Make sure all gl_FragCoord redeclarations specify the same layout
3662 if (is_conflicting_fragcoord_redeclaration(state
, qual
)) {
3663 const char *const qual_string
=
3664 get_layout_qualifier_string(qual
->flags
.q
.origin_upper_left
,
3665 qual
->flags
.q
.pixel_center_integer
);
3667 const char *const state_string
=
3668 get_layout_qualifier_string(state
->fs_origin_upper_left
,
3669 state
->fs_pixel_center_integer
);
3671 _mesa_glsl_error(loc
, state
,
3672 "gl_FragCoord redeclared with different layout "
3673 "qualifiers (%s) and (%s) ",
3677 state
->fs_origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
3678 state
->fs_pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
3679 state
->fs_redeclares_gl_fragcoord_with_no_layout_qualifiers
=
3680 !qual
->flags
.q
.origin_upper_left
&& !qual
->flags
.q
.pixel_center_integer
;
3681 state
->fs_redeclares_gl_fragcoord
=
3682 state
->fs_origin_upper_left
||
3683 state
->fs_pixel_center_integer
||
3684 state
->fs_redeclares_gl_fragcoord_with_no_layout_qualifiers
;
3687 if ((qual
->flags
.q
.origin_upper_left
|| qual
->flags
.q
.pixel_center_integer
)
3688 && (strcmp(var
->name
, "gl_FragCoord") != 0)) {
3689 const char *const qual_string
= (qual
->flags
.q
.origin_upper_left
)
3690 ? "origin_upper_left" : "pixel_center_integer";
3692 _mesa_glsl_error(loc
, state
,
3693 "layout qualifier `%s' can only be applied to "
3694 "fragment shader input `gl_FragCoord'",
3698 if (qual
->flags
.q
.explicit_location
) {
3699 apply_explicit_location(qual
, var
, state
, loc
);
3701 if (qual
->flags
.q
.explicit_component
) {
3702 unsigned qual_component
;
3703 if (process_qualifier_constant(state
, loc
, "component",
3704 qual
->component
, &qual_component
)) {
3705 const glsl_type
*type
= var
->type
->without_array();
3706 unsigned components
= type
->component_slots();
3708 if (type
->is_matrix() || type
->is_struct()) {
3709 _mesa_glsl_error(loc
, state
, "component layout qualifier "
3710 "cannot be applied to a matrix, a structure, "
3711 "a block, or an array containing any of "
3713 } else if (components
> 4 && type
->is_64bit()) {
3714 _mesa_glsl_error(loc
, state
, "component layout qualifier "
3715 "cannot be applied to dvec%u.",
3717 } else if (qual_component
!= 0 &&
3718 (qual_component
+ components
- 1) > 3) {
3719 _mesa_glsl_error(loc
, state
, "component overflow (%u > 3)",
3720 (qual_component
+ components
- 1));
3721 } else if (qual_component
== 1 && type
->is_64bit()) {
3722 /* We don't bother checking for 3 as it should be caught by the
3723 * overflow check above.
3725 _mesa_glsl_error(loc
, state
, "doubles cannot begin at "
3726 "component 1 or 3");
3728 var
->data
.explicit_component
= true;
3729 var
->data
.location_frac
= qual_component
;
3733 } else if (qual
->flags
.q
.explicit_index
) {
3734 if (!qual
->subroutine_list
)
3735 _mesa_glsl_error(loc
, state
,
3736 "explicit index requires explicit location");
3737 } else if (qual
->flags
.q
.explicit_component
) {
3738 _mesa_glsl_error(loc
, state
,
3739 "explicit component requires explicit location");
3742 if (qual
->flags
.q
.explicit_binding
) {
3743 apply_explicit_binding(state
, loc
, var
, var
->type
, qual
);
3746 if (state
->stage
== MESA_SHADER_GEOMETRY
&&
3747 qual
->flags
.q
.out
&& qual
->flags
.q
.stream
) {
3748 unsigned qual_stream
;
3749 if (process_qualifier_constant(state
, loc
, "stream", qual
->stream
,
3751 validate_stream_qualifier(loc
, state
, qual_stream
)) {
3752 var
->data
.stream
= qual_stream
;
3756 if (qual
->flags
.q
.out
&& qual
->flags
.q
.xfb_buffer
) {
3757 unsigned qual_xfb_buffer
;
3758 if (process_qualifier_constant(state
, loc
, "xfb_buffer",
3759 qual
->xfb_buffer
, &qual_xfb_buffer
) &&
3760 validate_xfb_buffer_qualifier(loc
, state
, qual_xfb_buffer
)) {
3761 var
->data
.xfb_buffer
= qual_xfb_buffer
;
3762 if (qual
->flags
.q
.explicit_xfb_buffer
)
3763 var
->data
.explicit_xfb_buffer
= true;
3767 if (qual
->flags
.q
.explicit_xfb_offset
) {
3768 unsigned qual_xfb_offset
;
3769 unsigned component_size
= var
->type
->contains_double() ? 8 : 4;
3771 if (process_qualifier_constant(state
, loc
, "xfb_offset",
3772 qual
->offset
, &qual_xfb_offset
) &&
3773 validate_xfb_offset_qualifier(loc
, state
, (int) qual_xfb_offset
,
3774 var
->type
, component_size
)) {
3775 var
->data
.offset
= qual_xfb_offset
;
3776 var
->data
.explicit_xfb_offset
= true;
3780 if (qual
->flags
.q
.explicit_xfb_stride
) {
3781 unsigned qual_xfb_stride
;
3782 if (process_qualifier_constant(state
, loc
, "xfb_stride",
3783 qual
->xfb_stride
, &qual_xfb_stride
)) {
3784 var
->data
.xfb_stride
= qual_xfb_stride
;
3785 var
->data
.explicit_xfb_stride
= true;
3789 if (var
->type
->contains_atomic()) {
3790 if (var
->data
.mode
== ir_var_uniform
) {
3791 if (var
->data
.explicit_binding
) {
3793 &state
->atomic_counter_offsets
[var
->data
.binding
];
3795 if (*offset
% ATOMIC_COUNTER_SIZE
)
3796 _mesa_glsl_error(loc
, state
,
3797 "misaligned atomic counter offset");
3799 var
->data
.offset
= *offset
;
3800 *offset
+= var
->type
->atomic_size();
3803 _mesa_glsl_error(loc
, state
,
3804 "atomic counters require explicit binding point");
3806 } else if (var
->data
.mode
!= ir_var_function_in
) {
3807 _mesa_glsl_error(loc
, state
, "atomic counters may only be declared as "
3808 "function parameters or uniform-qualified "
3809 "global variables");
3813 if (var
->type
->contains_sampler() &&
3814 !validate_storage_for_sampler_image_types(var
, state
, loc
))
3817 /* Is the 'layout' keyword used with parameters that allow relaxed checking.
3818 * Many implementations of GL_ARB_fragment_coord_conventions_enable and some
3819 * implementations (only Mesa?) GL_ARB_explicit_attrib_location_enable
3820 * allowed the layout qualifier to be used with 'varying' and 'attribute'.
3821 * These extensions and all following extensions that add the 'layout'
3822 * keyword have been modified to require the use of 'in' or 'out'.
3824 * The following extension do not allow the deprecated keywords:
3826 * GL_AMD_conservative_depth
3827 * GL_ARB_conservative_depth
3828 * GL_ARB_gpu_shader5
3829 * GL_ARB_separate_shader_objects
3830 * GL_ARB_tessellation_shader
3831 * GL_ARB_transform_feedback3
3832 * GL_ARB_uniform_buffer_object
3834 * It is unknown whether GL_EXT_shader_image_load_store or GL_NV_gpu_shader5
3835 * allow layout with the deprecated keywords.
3837 const bool relaxed_layout_qualifier_checking
=
3838 state
->ARB_fragment_coord_conventions_enable
;
3840 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
3841 || qual
->flags
.q
.varying
;
3842 if (qual
->has_layout() && uses_deprecated_qualifier
) {
3843 if (relaxed_layout_qualifier_checking
) {
3844 _mesa_glsl_warning(loc
, state
,
3845 "`layout' qualifier may not be used with "
3846 "`attribute' or `varying'");
3848 _mesa_glsl_error(loc
, state
,
3849 "`layout' qualifier may not be used with "
3850 "`attribute' or `varying'");
3854 /* Layout qualifiers for gl_FragDepth, which are enabled by extension
3855 * AMD_conservative_depth.
3857 if (qual
->flags
.q
.depth_type
3858 && !state
->is_version(420, 0)
3859 && !state
->AMD_conservative_depth_enable
3860 && !state
->ARB_conservative_depth_enable
) {
3861 _mesa_glsl_error(loc
, state
,
3862 "extension GL_AMD_conservative_depth or "
3863 "GL_ARB_conservative_depth must be enabled "
3864 "to use depth layout qualifiers");
3865 } else if (qual
->flags
.q
.depth_type
3866 && strcmp(var
->name
, "gl_FragDepth") != 0) {
3867 _mesa_glsl_error(loc
, state
,
3868 "depth layout qualifiers can be applied only to "
3872 switch (qual
->depth_type
) {
3874 var
->data
.depth_layout
= ir_depth_layout_any
;
3876 case ast_depth_greater
:
3877 var
->data
.depth_layout
= ir_depth_layout_greater
;
3879 case ast_depth_less
:
3880 var
->data
.depth_layout
= ir_depth_layout_less
;
3882 case ast_depth_unchanged
:
3883 var
->data
.depth_layout
= ir_depth_layout_unchanged
;
3886 var
->data
.depth_layout
= ir_depth_layout_none
;
3890 if (qual
->flags
.q
.std140
||
3891 qual
->flags
.q
.std430
||
3892 qual
->flags
.q
.packed
||
3893 qual
->flags
.q
.shared
) {
3894 _mesa_glsl_error(loc
, state
,
3895 "uniform and shader storage block layout qualifiers "
3896 "std140, std430, packed, and shared can only be "
3897 "applied to uniform or shader storage blocks, not "
3901 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
3902 validate_matrix_layout_for_type(state
, loc
, var
->type
, var
);
3905 /* From section 4.4.1.3 of the GLSL 4.50 specification (Fragment Shader
3908 * "Fragment shaders also allow the following layout qualifier on in only
3909 * (not with variable declarations)
3910 * layout-qualifier-id
3911 * early_fragment_tests
3914 if (qual
->flags
.q
.early_fragment_tests
) {
3915 _mesa_glsl_error(loc
, state
, "early_fragment_tests layout qualifier only "
3916 "valid in fragment shader input layout declaration.");
3919 if (qual
->flags
.q
.inner_coverage
) {
3920 _mesa_glsl_error(loc
, state
, "inner_coverage layout qualifier only "
3921 "valid in fragment shader input layout declaration.");
3924 if (qual
->flags
.q
.post_depth_coverage
) {
3925 _mesa_glsl_error(loc
, state
, "post_depth_coverage layout qualifier only "
3926 "valid in fragment shader input layout declaration.");
3929 if (state
->has_bindless())
3930 apply_bindless_qualifier_to_variable(qual
, var
, state
, loc
);
3932 if (qual
->flags
.q
.pixel_interlock_ordered
||
3933 qual
->flags
.q
.pixel_interlock_unordered
||
3934 qual
->flags
.q
.sample_interlock_ordered
||
3935 qual
->flags
.q
.sample_interlock_unordered
) {
3936 _mesa_glsl_error(loc
, state
, "interlock layout qualifiers: "
3937 "pixel_interlock_ordered, pixel_interlock_unordered, "
3938 "sample_interlock_ordered and sample_interlock_unordered, "
3939 "only valid in fragment shader input layout declaration.");
3944 apply_type_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
3946 struct _mesa_glsl_parse_state
*state
,
3950 STATIC_ASSERT(sizeof(qual
->flags
.q
) <= sizeof(qual
->flags
.i
));
3952 if (qual
->flags
.q
.invariant
) {
3953 if (var
->data
.used
) {
3954 _mesa_glsl_error(loc
, state
,
3955 "variable `%s' may not be redeclared "
3956 "`invariant' after being used",
3959 var
->data
.explicit_invariant
= true;
3960 var
->data
.invariant
= true;
3964 if (qual
->flags
.q
.precise
) {
3965 if (var
->data
.used
) {
3966 _mesa_glsl_error(loc
, state
,
3967 "variable `%s' may not be redeclared "
3968 "`precise' after being used",
3971 var
->data
.precise
= 1;
3975 if (qual
->is_subroutine_decl() && !qual
->flags
.q
.uniform
) {
3976 _mesa_glsl_error(loc
, state
,
3977 "`subroutine' may only be applied to uniforms, "
3978 "subroutine type declarations, or function definitions");
3981 if (qual
->flags
.q
.constant
|| qual
->flags
.q
.attribute
3982 || qual
->flags
.q
.uniform
3983 || (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_FRAGMENT
)))
3984 var
->data
.read_only
= 1;
3986 if (qual
->flags
.q
.centroid
)
3987 var
->data
.centroid
= 1;
3989 if (qual
->flags
.q
.sample
)
3990 var
->data
.sample
= 1;
3992 /* Precision qualifiers do not hold any meaning in Desktop GLSL */
3993 if (state
->es_shader
) {
3994 var
->data
.precision
=
3995 select_gles_precision(qual
->precision
, var
->type
, state
, loc
);
3998 if (qual
->flags
.q
.patch
)
3999 var
->data
.patch
= 1;
4001 if (qual
->flags
.q
.attribute
&& state
->stage
!= MESA_SHADER_VERTEX
) {
4002 var
->type
= glsl_type::error_type
;
4003 _mesa_glsl_error(loc
, state
,
4004 "`attribute' variables may not be declared in the "
4006 _mesa_shader_stage_to_string(state
->stage
));
4009 /* Disallow layout qualifiers which may only appear on layout declarations. */
4010 if (qual
->flags
.q
.prim_type
) {
4011 _mesa_glsl_error(loc
, state
,
4012 "Primitive type may only be specified on GS input or output "
4013 "layout declaration, not on variables.");
4016 /* Section 6.1.1 (Function Calling Conventions) of the GLSL 1.10 spec says:
4018 * "However, the const qualifier cannot be used with out or inout."
4020 * The same section of the GLSL 4.40 spec further clarifies this saying:
4022 * "The const qualifier cannot be used with out or inout, or a
4023 * compile-time error results."
4025 if (is_parameter
&& qual
->flags
.q
.constant
&& qual
->flags
.q
.out
) {
4026 _mesa_glsl_error(loc
, state
,
4027 "`const' may not be applied to `out' or `inout' "
4028 "function parameters");
4031 /* If there is no qualifier that changes the mode of the variable, leave
4032 * the setting alone.
4034 assert(var
->data
.mode
!= ir_var_temporary
);
4035 if (qual
->flags
.q
.in
&& qual
->flags
.q
.out
)
4036 var
->data
.mode
= is_parameter
? ir_var_function_inout
: ir_var_shader_out
;
4037 else if (qual
->flags
.q
.in
)
4038 var
->data
.mode
= is_parameter
? ir_var_function_in
: ir_var_shader_in
;
4039 else if (qual
->flags
.q
.attribute
4040 || (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_FRAGMENT
)))
4041 var
->data
.mode
= ir_var_shader_in
;
4042 else if (qual
->flags
.q
.out
)
4043 var
->data
.mode
= is_parameter
? ir_var_function_out
: ir_var_shader_out
;
4044 else if (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_VERTEX
))
4045 var
->data
.mode
= ir_var_shader_out
;
4046 else if (qual
->flags
.q
.uniform
)
4047 var
->data
.mode
= ir_var_uniform
;
4048 else if (qual
->flags
.q
.buffer
)
4049 var
->data
.mode
= ir_var_shader_storage
;
4050 else if (qual
->flags
.q
.shared_storage
)
4051 var
->data
.mode
= ir_var_shader_shared
;
4053 if (!is_parameter
&& state
->has_framebuffer_fetch() &&
4054 state
->stage
== MESA_SHADER_FRAGMENT
) {
4055 if (state
->is_version(130, 300))
4056 var
->data
.fb_fetch_output
= qual
->flags
.q
.in
&& qual
->flags
.q
.out
;
4058 var
->data
.fb_fetch_output
= (strcmp(var
->name
, "gl_LastFragData") == 0);
4061 if (var
->data
.fb_fetch_output
) {
4062 var
->data
.assigned
= true;
4063 var
->data
.memory_coherent
= !qual
->flags
.q
.non_coherent
;
4065 /* From the EXT_shader_framebuffer_fetch spec:
4067 * "It is an error to declare an inout fragment output not qualified
4068 * with layout(noncoherent) if the GL_EXT_shader_framebuffer_fetch
4069 * extension hasn't been enabled."
4071 if (var
->data
.memory_coherent
&&
4072 !state
->EXT_shader_framebuffer_fetch_enable
)
4073 _mesa_glsl_error(loc
, state
,
4074 "invalid declaration of framebuffer fetch output not "
4075 "qualified with layout(noncoherent)");
4078 /* From the EXT_shader_framebuffer_fetch spec:
4080 * "Fragment outputs declared inout may specify the following layout
4081 * qualifier: [...] noncoherent"
4083 if (qual
->flags
.q
.non_coherent
)
4084 _mesa_glsl_error(loc
, state
,
4085 "invalid layout(noncoherent) qualifier not part of "
4086 "framebuffer fetch output declaration");
4089 if (!is_parameter
&& is_varying_var(var
, state
->stage
)) {
4090 /* User-defined ins/outs are not permitted in compute shaders. */
4091 if (state
->stage
== MESA_SHADER_COMPUTE
) {
4092 _mesa_glsl_error(loc
, state
,
4093 "user-defined input and output variables are not "
4094 "permitted in compute shaders");
4097 /* This variable is being used to link data between shader stages (in
4098 * pre-glsl-1.30 parlance, it's a "varying"). Check that it has a type
4099 * that is allowed for such purposes.
4101 * From page 25 (page 31 of the PDF) of the GLSL 1.10 spec:
4103 * "The varying qualifier can be used only with the data types
4104 * float, vec2, vec3, vec4, mat2, mat3, and mat4, or arrays of
4107 * This was relaxed in GLSL version 1.30 and GLSL ES version 3.00. From
4108 * page 31 (page 37 of the PDF) of the GLSL 1.30 spec:
4110 * "Fragment inputs can only be signed and unsigned integers and
4111 * integer vectors, float, floating-point vectors, matrices, or
4112 * arrays of these. Structures cannot be input.
4114 * Similar text exists in the section on vertex shader outputs.
4116 * Similar text exists in the GLSL ES 3.00 spec, except that the GLSL ES
4117 * 3.00 spec allows structs as well. Varying structs are also allowed
4120 * From section 4.3.4 of the ARB_bindless_texture spec:
4122 * "(modify third paragraph of the section to allow sampler and image
4123 * types) ... Vertex shader inputs can only be float,
4124 * single-precision floating-point scalars, single-precision
4125 * floating-point vectors, matrices, signed and unsigned integers
4126 * and integer vectors, sampler and image types."
4128 * From section 4.3.6 of the ARB_bindless_texture spec:
4130 * "Output variables can only be floating-point scalars,
4131 * floating-point vectors, matrices, signed or unsigned integers or
4132 * integer vectors, sampler or image types, or arrays or structures
4135 switch (var
->type
->without_array()->base_type
) {
4136 case GLSL_TYPE_FLOAT
:
4137 /* Ok in all GLSL versions */
4139 case GLSL_TYPE_UINT
:
4141 if (state
->is_version(130, 300) || state
->EXT_gpu_shader4_enable
)
4143 _mesa_glsl_error(loc
, state
,
4144 "varying variables must be of base type float in %s",
4145 state
->get_version_string());
4147 case GLSL_TYPE_STRUCT
:
4148 if (state
->is_version(150, 300))
4150 _mesa_glsl_error(loc
, state
,
4151 "varying variables may not be of type struct");
4153 case GLSL_TYPE_DOUBLE
:
4154 case GLSL_TYPE_UINT64
:
4155 case GLSL_TYPE_INT64
:
4157 case GLSL_TYPE_SAMPLER
:
4158 case GLSL_TYPE_IMAGE
:
4159 if (state
->has_bindless())
4163 _mesa_glsl_error(loc
, state
, "illegal type for a varying variable");
4168 if (state
->all_invariant
&& var
->data
.mode
== ir_var_shader_out
) {
4169 var
->data
.explicit_invariant
= true;
4170 var
->data
.invariant
= true;
4173 var
->data
.interpolation
=
4174 interpret_interpolation_qualifier(qual
, var
->type
,
4175 (ir_variable_mode
) var
->data
.mode
,
4178 /* Does the declaration use the deprecated 'attribute' or 'varying'
4181 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
4182 || qual
->flags
.q
.varying
;
4185 /* Validate auxiliary storage qualifiers */
4187 /* From section 4.3.4 of the GLSL 1.30 spec:
4188 * "It is an error to use centroid in in a vertex shader."
4190 * From section 4.3.4 of the GLSL ES 3.00 spec:
4191 * "It is an error to use centroid in or interpolation qualifiers in
4192 * a vertex shader input."
4195 /* Section 4.3.6 of the GLSL 1.30 specification states:
4196 * "It is an error to use centroid out in a fragment shader."
4198 * The GL_ARB_shading_language_420pack extension specification states:
4199 * "It is an error to use auxiliary storage qualifiers or interpolation
4200 * qualifiers on an output in a fragment shader."
4202 if (qual
->flags
.q
.sample
&& (!is_varying_var(var
, state
->stage
) || uses_deprecated_qualifier
)) {
4203 _mesa_glsl_error(loc
, state
,
4204 "sample qualifier may only be used on `in` or `out` "
4205 "variables between shader stages");
4207 if (qual
->flags
.q
.centroid
&& !is_varying_var(var
, state
->stage
)) {
4208 _mesa_glsl_error(loc
, state
,
4209 "centroid qualifier may only be used with `in', "
4210 "`out' or `varying' variables between shader stages");
4213 if (qual
->flags
.q
.shared_storage
&& state
->stage
!= MESA_SHADER_COMPUTE
) {
4214 _mesa_glsl_error(loc
, state
,
4215 "the shared storage qualifiers can only be used with "
4219 apply_image_qualifier_to_variable(qual
, var
, state
, loc
);
4223 * Get the variable that is being redeclared by this declaration or if it
4224 * does not exist, the current declared variable.
4226 * Semantic checks to verify the validity of the redeclaration are also
4227 * performed. If semantic checks fail, compilation error will be emitted via
4228 * \c _mesa_glsl_error, but a non-\c NULL pointer will still be returned.
4231 * A pointer to an existing variable in the current scope if the declaration
4232 * is a redeclaration, current variable otherwise. \c is_declared boolean
4233 * will return \c true if the declaration is a redeclaration, \c false
4236 static ir_variable
*
4237 get_variable_being_redeclared(ir_variable
**var_ptr
, YYLTYPE loc
,
4238 struct _mesa_glsl_parse_state
*state
,
4239 bool allow_all_redeclarations
,
4240 bool *is_redeclaration
)
4242 ir_variable
*var
= *var_ptr
;
4244 /* Check if this declaration is actually a re-declaration, either to
4245 * resize an array or add qualifiers to an existing variable.
4247 * This is allowed for variables in the current scope, or when at
4248 * global scope (for built-ins in the implicit outer scope).
4250 ir_variable
*earlier
= state
->symbols
->get_variable(var
->name
);
4251 if (earlier
== NULL
||
4252 (state
->current_function
!= NULL
&&
4253 !state
->symbols
->name_declared_this_scope(var
->name
))) {
4254 *is_redeclaration
= false;
4258 *is_redeclaration
= true;
4260 if (earlier
->data
.how_declared
== ir_var_declared_implicitly
) {
4261 /* Verify that the redeclaration of a built-in does not change the
4262 * storage qualifier. There are a couple special cases.
4264 * 1. Some built-in variables that are defined as 'in' in the
4265 * specification are implemented as system values. Allow
4266 * ir_var_system_value -> ir_var_shader_in.
4268 * 2. gl_LastFragData is implemented as a ir_var_shader_out, but the
4269 * specification requires that redeclarations omit any qualifier.
4270 * Allow ir_var_shader_out -> ir_var_auto for this one variable.
4272 if (earlier
->data
.mode
!= var
->data
.mode
&&
4273 !(earlier
->data
.mode
== ir_var_system_value
&&
4274 var
->data
.mode
== ir_var_shader_in
) &&
4275 !(strcmp(var
->name
, "gl_LastFragData") == 0 &&
4276 var
->data
.mode
== ir_var_auto
)) {
4277 _mesa_glsl_error(&loc
, state
,
4278 "redeclaration cannot change qualification of `%s'",
4283 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec,
4285 * "It is legal to declare an array without a size and then
4286 * later re-declare the same name as an array of the same
4287 * type and specify a size."
4289 if (earlier
->type
->is_unsized_array() && var
->type
->is_array()
4290 && (var
->type
->fields
.array
== earlier
->type
->fields
.array
)) {
4291 const int size
= var
->type
->array_size();
4292 check_builtin_array_max_size(var
->name
, size
, loc
, state
);
4293 if ((size
> 0) && (size
<= earlier
->data
.max_array_access
)) {
4294 _mesa_glsl_error(& loc
, state
, "array size must be > %u due to "
4296 earlier
->data
.max_array_access
);
4299 earlier
->type
= var
->type
;
4303 } else if (earlier
->type
!= var
->type
) {
4304 _mesa_glsl_error(&loc
, state
,
4305 "redeclaration of `%s' has incorrect type",
4307 } else if ((state
->ARB_fragment_coord_conventions_enable
||
4308 state
->is_version(150, 0))
4309 && strcmp(var
->name
, "gl_FragCoord") == 0) {
4310 /* Allow redeclaration of gl_FragCoord for ARB_fcc layout
4313 * We don't really need to do anything here, just allow the
4314 * redeclaration. Any error on the gl_FragCoord is handled on the ast
4315 * level at apply_layout_qualifier_to_variable using the
4316 * ast_type_qualifier and _mesa_glsl_parse_state, or later at
4319 /* According to section 4.3.7 of the GLSL 1.30 spec,
4320 * the following built-in varaibles can be redeclared with an
4321 * interpolation qualifier:
4324 * * gl_FrontSecondaryColor
4325 * * gl_BackSecondaryColor
4327 * * gl_SecondaryColor
4329 } else if (state
->is_version(130, 0)
4330 && (strcmp(var
->name
, "gl_FrontColor") == 0
4331 || strcmp(var
->name
, "gl_BackColor") == 0
4332 || strcmp(var
->name
, "gl_FrontSecondaryColor") == 0
4333 || strcmp(var
->name
, "gl_BackSecondaryColor") == 0
4334 || strcmp(var
->name
, "gl_Color") == 0
4335 || strcmp(var
->name
, "gl_SecondaryColor") == 0)) {
4336 earlier
->data
.interpolation
= var
->data
.interpolation
;
4338 /* Layout qualifiers for gl_FragDepth. */
4339 } else if ((state
->is_version(420, 0) ||
4340 state
->AMD_conservative_depth_enable
||
4341 state
->ARB_conservative_depth_enable
)
4342 && strcmp(var
->name
, "gl_FragDepth") == 0) {
4344 /** From the AMD_conservative_depth spec:
4345 * Within any shader, the first redeclarations of gl_FragDepth
4346 * must appear before any use of gl_FragDepth.
4348 if (earlier
->data
.used
) {
4349 _mesa_glsl_error(&loc
, state
,
4350 "the first redeclaration of gl_FragDepth "
4351 "must appear before any use of gl_FragDepth");
4354 /* Prevent inconsistent redeclaration of depth layout qualifier. */
4355 if (earlier
->data
.depth_layout
!= ir_depth_layout_none
4356 && earlier
->data
.depth_layout
!= var
->data
.depth_layout
) {
4357 _mesa_glsl_error(&loc
, state
,
4358 "gl_FragDepth: depth layout is declared here "
4359 "as '%s, but it was previously declared as "
4361 depth_layout_string(var
->data
.depth_layout
),
4362 depth_layout_string(earlier
->data
.depth_layout
));
4365 earlier
->data
.depth_layout
= var
->data
.depth_layout
;
4367 } else if (state
->has_framebuffer_fetch() &&
4368 strcmp(var
->name
, "gl_LastFragData") == 0 &&
4369 var
->data
.mode
== ir_var_auto
) {
4370 /* According to the EXT_shader_framebuffer_fetch spec:
4372 * "By default, gl_LastFragData is declared with the mediump precision
4373 * qualifier. This can be changed by redeclaring the corresponding
4374 * variables with the desired precision qualifier."
4376 * "Fragment shaders may specify the following layout qualifier only for
4377 * redeclaring the built-in gl_LastFragData array [...]: noncoherent"
4379 earlier
->data
.precision
= var
->data
.precision
;
4380 earlier
->data
.memory_coherent
= var
->data
.memory_coherent
;
4382 } else if ((earlier
->data
.how_declared
== ir_var_declared_implicitly
&&
4383 state
->allow_builtin_variable_redeclaration
) ||
4384 allow_all_redeclarations
) {
4385 /* Allow verbatim redeclarations of built-in variables. Not explicitly
4386 * valid, but some applications do it.
4389 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", var
->name
);
4396 * Generate the IR for an initializer in a variable declaration
4399 process_initializer(ir_variable
*var
, ast_declaration
*decl
,
4400 ast_fully_specified_type
*type
,
4401 exec_list
*initializer_instructions
,
4402 struct _mesa_glsl_parse_state
*state
)
4404 void *mem_ctx
= state
;
4405 ir_rvalue
*result
= NULL
;
4407 YYLTYPE initializer_loc
= decl
->initializer
->get_location();
4409 /* From page 24 (page 30 of the PDF) of the GLSL 1.10 spec:
4411 * "All uniform variables are read-only and are initialized either
4412 * directly by an application via API commands, or indirectly by
4415 if (var
->data
.mode
== ir_var_uniform
) {
4416 state
->check_version(120, 0, &initializer_loc
,
4417 "cannot initialize uniform %s",
4421 /* Section 4.3.7 "Buffer Variables" of the GLSL 4.30 spec:
4423 * "Buffer variables cannot have initializers."
4425 if (var
->data
.mode
== ir_var_shader_storage
) {
4426 _mesa_glsl_error(&initializer_loc
, state
,
4427 "cannot initialize buffer variable %s",
4431 /* From section 4.1.7 of the GLSL 4.40 spec:
4433 * "Opaque variables [...] are initialized only through the
4434 * OpenGL API; they cannot be declared with an initializer in a
4437 * From section 4.1.7 of the ARB_bindless_texture spec:
4439 * "Samplers may be declared as shader inputs and outputs, as uniform
4440 * variables, as temporary variables, and as function parameters."
4442 * From section 4.1.X of the ARB_bindless_texture spec:
4444 * "Images may be declared as shader inputs and outputs, as uniform
4445 * variables, as temporary variables, and as function parameters."
4447 if (var
->type
->contains_atomic() ||
4448 (!state
->has_bindless() && var
->type
->contains_opaque())) {
4449 _mesa_glsl_error(&initializer_loc
, state
,
4450 "cannot initialize %s variable %s",
4451 var
->name
, state
->has_bindless() ? "atomic" : "opaque");
4454 if ((var
->data
.mode
== ir_var_shader_in
) && (state
->current_function
== NULL
)) {
4455 _mesa_glsl_error(&initializer_loc
, state
,
4456 "cannot initialize %s shader input / %s %s",
4457 _mesa_shader_stage_to_string(state
->stage
),
4458 (state
->stage
== MESA_SHADER_VERTEX
)
4459 ? "attribute" : "varying",
4463 if (var
->data
.mode
== ir_var_shader_out
&& state
->current_function
== NULL
) {
4464 _mesa_glsl_error(&initializer_loc
, state
,
4465 "cannot initialize %s shader output %s",
4466 _mesa_shader_stage_to_string(state
->stage
),
4470 /* If the initializer is an ast_aggregate_initializer, recursively store
4471 * type information from the LHS into it, so that its hir() function can do
4474 if (decl
->initializer
->oper
== ast_aggregate
)
4475 _mesa_ast_set_aggregate_type(var
->type
, decl
->initializer
);
4477 ir_dereference
*const lhs
= new(state
) ir_dereference_variable(var
);
4478 ir_rvalue
*rhs
= decl
->initializer
->hir(initializer_instructions
, state
);
4480 /* Calculate the constant value if this is a const or uniform
4483 * Section 4.3 (Storage Qualifiers) of the GLSL ES 1.00.17 spec says:
4485 * "Declarations of globals without a storage qualifier, or with
4486 * just the const qualifier, may include initializers, in which case
4487 * they will be initialized before the first line of main() is
4488 * executed. Such initializers must be a constant expression."
4490 * The same section of the GLSL ES 3.00.4 spec has similar language.
4492 if (type
->qualifier
.flags
.q
.constant
4493 || type
->qualifier
.flags
.q
.uniform
4494 || (state
->es_shader
&& state
->current_function
== NULL
)) {
4495 ir_rvalue
*new_rhs
= validate_assignment(state
, initializer_loc
,
4497 if (new_rhs
!= NULL
) {
4500 /* Section 4.3.3 (Constant Expressions) of the GLSL ES 3.00.4 spec
4503 * "A constant expression is one of
4507 * - an expression formed by an operator on operands that are
4508 * all constant expressions, including getting an element of
4509 * a constant array, or a field of a constant structure, or
4510 * components of a constant vector. However, the sequence
4511 * operator ( , ) and the assignment operators ( =, +=, ...)
4512 * are not included in the operators that can create a
4513 * constant expression."
4515 * Section 12.43 (Sequence operator and constant expressions) says:
4517 * "Should the following construct be allowed?
4521 * The expression within the brackets uses the sequence operator
4522 * (',') and returns the integer 3 so the construct is declaring
4523 * a single-dimensional array of size 3. In some languages, the
4524 * construct declares a two-dimensional array. It would be
4525 * preferable to make this construct illegal to avoid confusion.
4527 * One possibility is to change the definition of the sequence
4528 * operator so that it does not return a constant-expression and
4529 * hence cannot be used to declare an array size.
4531 * RESOLUTION: The result of a sequence operator is not a
4532 * constant-expression."
4534 * Section 4.3.3 (Constant Expressions) of the GLSL 4.30.9 spec
4535 * contains language almost identical to the section 4.3.3 in the
4536 * GLSL ES 3.00.4 spec. This is a new limitation for these GLSL
4539 ir_constant
*constant_value
=
4540 rhs
->constant_expression_value(mem_ctx
);
4542 if (!constant_value
||
4543 (state
->is_version(430, 300) &&
4544 decl
->initializer
->has_sequence_subexpression())) {
4545 const char *const variable_mode
=
4546 (type
->qualifier
.flags
.q
.constant
)
4548 : ((type
->qualifier
.flags
.q
.uniform
) ? "uniform" : "global");
4550 /* If ARB_shading_language_420pack is enabled, initializers of
4551 * const-qualified local variables do not have to be constant
4552 * expressions. Const-qualified global variables must still be
4553 * initialized with constant expressions.
4555 if (!state
->has_420pack()
4556 || state
->current_function
== NULL
) {
4557 _mesa_glsl_error(& initializer_loc
, state
,
4558 "initializer of %s variable `%s' must be a "
4559 "constant expression",
4562 if (var
->type
->is_numeric()) {
4563 /* Reduce cascading errors. */
4564 var
->constant_value
= type
->qualifier
.flags
.q
.constant
4565 ? ir_constant::zero(state
, var
->type
) : NULL
;
4569 rhs
= constant_value
;
4570 var
->constant_value
= type
->qualifier
.flags
.q
.constant
4571 ? constant_value
: NULL
;
4574 if (var
->type
->is_numeric()) {
4575 /* Reduce cascading errors. */
4576 rhs
= var
->constant_value
= type
->qualifier
.flags
.q
.constant
4577 ? ir_constant::zero(state
, var
->type
) : NULL
;
4582 if (rhs
&& !rhs
->type
->is_error()) {
4583 bool temp
= var
->data
.read_only
;
4584 if (type
->qualifier
.flags
.q
.constant
)
4585 var
->data
.read_only
= false;
4587 /* Never emit code to initialize a uniform.
4589 const glsl_type
*initializer_type
;
4590 bool error_emitted
= false;
4591 if (!type
->qualifier
.flags
.q
.uniform
) {
4593 do_assignment(initializer_instructions
, state
,
4595 &result
, true, true,
4596 type
->get_location());
4597 initializer_type
= result
->type
;
4599 initializer_type
= rhs
->type
;
4601 if (!error_emitted
) {
4602 var
->constant_initializer
= rhs
->constant_expression_value(mem_ctx
);
4603 var
->data
.has_initializer
= true;
4605 /* If the declared variable is an unsized array, it must inherrit
4606 * its full type from the initializer. A declaration such as
4608 * uniform float a[] = float[](1.0, 2.0, 3.0, 3.0);
4612 * uniform float a[4] = float[](1.0, 2.0, 3.0, 3.0);
4614 * The assignment generated in the if-statement (below) will also
4615 * automatically handle this case for non-uniforms.
4617 * If the declared variable is not an array, the types must
4618 * already match exactly. As a result, the type assignment
4619 * here can be done unconditionally. For non-uniforms the call
4620 * to do_assignment can change the type of the initializer (via
4621 * the implicit conversion rules). For uniforms the initializer
4622 * must be a constant expression, and the type of that expression
4623 * was validated above.
4625 var
->type
= initializer_type
;
4628 var
->data
.read_only
= temp
;
4635 validate_layout_qualifier_vertex_count(struct _mesa_glsl_parse_state
*state
,
4636 YYLTYPE loc
, ir_variable
*var
,
4637 unsigned num_vertices
,
4639 const char *var_category
)
4641 if (var
->type
->is_unsized_array()) {
4642 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec says:
4644 * All geometry shader input unsized array declarations will be
4645 * sized by an earlier input layout qualifier, when present, as per
4646 * the following table.
4648 * Followed by a table mapping each allowed input layout qualifier to
4649 * the corresponding input length.
4651 * Similarly for tessellation control shader outputs.
4653 if (num_vertices
!= 0)
4654 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
4657 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec
4658 * includes the following examples of compile-time errors:
4660 * // code sequence within one shader...
4661 * in vec4 Color1[]; // size unknown
4662 * ...Color1.length()...// illegal, length() unknown
4663 * in vec4 Color2[2]; // size is 2
4664 * ...Color1.length()...// illegal, Color1 still has no size
4665 * in vec4 Color3[3]; // illegal, input sizes are inconsistent
4666 * layout(lines) in; // legal, input size is 2, matching
4667 * in vec4 Color4[3]; // illegal, contradicts layout
4670 * To detect the case illustrated by Color3, we verify that the size of
4671 * an explicitly-sized array matches the size of any previously declared
4672 * explicitly-sized array. To detect the case illustrated by Color4, we
4673 * verify that the size of an explicitly-sized array is consistent with
4674 * any previously declared input layout.
4676 if (num_vertices
!= 0 && var
->type
->length
!= num_vertices
) {
4677 _mesa_glsl_error(&loc
, state
,
4678 "%s size contradicts previously declared layout "
4679 "(size is %u, but layout requires a size of %u)",
4680 var_category
, var
->type
->length
, num_vertices
);
4681 } else if (*size
!= 0 && var
->type
->length
!= *size
) {
4682 _mesa_glsl_error(&loc
, state
,
4683 "%s sizes are inconsistent (size is %u, but a "
4684 "previous declaration has size %u)",
4685 var_category
, var
->type
->length
, *size
);
4687 *size
= var
->type
->length
;
4693 handle_tess_ctrl_shader_output_decl(struct _mesa_glsl_parse_state
*state
,
4694 YYLTYPE loc
, ir_variable
*var
)
4696 unsigned num_vertices
= 0;
4698 if (state
->tcs_output_vertices_specified
) {
4699 if (!state
->out_qualifier
->vertices
->
4700 process_qualifier_constant(state
, "vertices",
4701 &num_vertices
, false)) {
4705 if (num_vertices
> state
->Const
.MaxPatchVertices
) {
4706 _mesa_glsl_error(&loc
, state
, "vertices (%d) exceeds "
4707 "GL_MAX_PATCH_VERTICES", num_vertices
);
4712 if (!var
->type
->is_array() && !var
->data
.patch
) {
4713 _mesa_glsl_error(&loc
, state
,
4714 "tessellation control shader outputs must be arrays");
4716 /* To avoid cascading failures, short circuit the checks below. */
4720 if (var
->data
.patch
)
4723 validate_layout_qualifier_vertex_count(state
, loc
, var
, num_vertices
,
4724 &state
->tcs_output_size
,
4725 "tessellation control shader output");
4729 * Do additional processing necessary for tessellation control/evaluation shader
4730 * input declarations. This covers both interface block arrays and bare input
4734 handle_tess_shader_input_decl(struct _mesa_glsl_parse_state
*state
,
4735 YYLTYPE loc
, ir_variable
*var
)
4737 if (!var
->type
->is_array() && !var
->data
.patch
) {
4738 _mesa_glsl_error(&loc
, state
,
4739 "per-vertex tessellation shader inputs must be arrays");
4740 /* Avoid cascading failures. */
4744 if (var
->data
.patch
)
4747 /* The ARB_tessellation_shader spec says:
4749 * "Declaring an array size is optional. If no size is specified, it
4750 * will be taken from the implementation-dependent maximum patch size
4751 * (gl_MaxPatchVertices). If a size is specified, it must match the
4752 * maximum patch size; otherwise, a compile or link error will occur."
4754 * This text appears twice, once for TCS inputs, and again for TES inputs.
4756 if (var
->type
->is_unsized_array()) {
4757 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
4758 state
->Const
.MaxPatchVertices
);
4759 } else if (var
->type
->length
!= state
->Const
.MaxPatchVertices
) {
4760 _mesa_glsl_error(&loc
, state
,
4761 "per-vertex tessellation shader input arrays must be "
4762 "sized to gl_MaxPatchVertices (%d).",
4763 state
->Const
.MaxPatchVertices
);
4769 * Do additional processing necessary for geometry shader input declarations
4770 * (this covers both interface blocks arrays and bare input variables).
4773 handle_geometry_shader_input_decl(struct _mesa_glsl_parse_state
*state
,
4774 YYLTYPE loc
, ir_variable
*var
)
4776 unsigned num_vertices
= 0;
4778 if (state
->gs_input_prim_type_specified
) {
4779 num_vertices
= vertices_per_prim(state
->in_qualifier
->prim_type
);
4782 /* Geometry shader input variables must be arrays. Caller should have
4783 * reported an error for this.
4785 if (!var
->type
->is_array()) {
4786 assert(state
->error
);
4788 /* To avoid cascading failures, short circuit the checks below. */
4792 validate_layout_qualifier_vertex_count(state
, loc
, var
, num_vertices
,
4793 &state
->gs_input_size
,
4794 "geometry shader input");
4798 validate_identifier(const char *identifier
, YYLTYPE loc
,
4799 struct _mesa_glsl_parse_state
*state
)
4801 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
4803 * "Identifiers starting with "gl_" are reserved for use by
4804 * OpenGL, and may not be declared in a shader as either a
4805 * variable or a function."
4807 if (is_gl_identifier(identifier
)) {
4808 _mesa_glsl_error(&loc
, state
,
4809 "identifier `%s' uses reserved `gl_' prefix",
4811 } else if (strstr(identifier
, "__")) {
4812 /* From page 14 (page 20 of the PDF) of the GLSL 1.10
4815 * "In addition, all identifiers containing two
4816 * consecutive underscores (__) are reserved as
4817 * possible future keywords."
4819 * The intention is that names containing __ are reserved for internal
4820 * use by the implementation, and names prefixed with GL_ are reserved
4821 * for use by Khronos. Names simply containing __ are dangerous to use,
4822 * but should be allowed.
4824 * A future version of the GLSL specification will clarify this.
4826 _mesa_glsl_warning(&loc
, state
,
4827 "identifier `%s' uses reserved `__' string",
4833 ast_declarator_list::hir(exec_list
*instructions
,
4834 struct _mesa_glsl_parse_state
*state
)
4837 const struct glsl_type
*decl_type
;
4838 const char *type_name
= NULL
;
4839 ir_rvalue
*result
= NULL
;
4840 YYLTYPE loc
= this->get_location();
4842 /* From page 46 (page 52 of the PDF) of the GLSL 1.50 spec:
4844 * "To ensure that a particular output variable is invariant, it is
4845 * necessary to use the invariant qualifier. It can either be used to
4846 * qualify a previously declared variable as being invariant
4848 * invariant gl_Position; // make existing gl_Position be invariant"
4850 * In these cases the parser will set the 'invariant' flag in the declarator
4851 * list, and the type will be NULL.
4853 if (this->invariant
) {
4854 assert(this->type
== NULL
);
4856 if (state
->current_function
!= NULL
) {
4857 _mesa_glsl_error(& loc
, state
,
4858 "all uses of `invariant' keyword must be at global "
4862 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
4863 assert(decl
->array_specifier
== NULL
);
4864 assert(decl
->initializer
== NULL
);
4866 ir_variable
*const earlier
=
4867 state
->symbols
->get_variable(decl
->identifier
);
4868 if (earlier
== NULL
) {
4869 _mesa_glsl_error(& loc
, state
,
4870 "undeclared variable `%s' cannot be marked "
4871 "invariant", decl
->identifier
);
4872 } else if (!is_allowed_invariant(earlier
, state
)) {
4873 _mesa_glsl_error(&loc
, state
,
4874 "`%s' cannot be marked invariant; interfaces between "
4875 "shader stages only.", decl
->identifier
);
4876 } else if (earlier
->data
.used
) {
4877 _mesa_glsl_error(& loc
, state
,
4878 "variable `%s' may not be redeclared "
4879 "`invariant' after being used",
4882 earlier
->data
.explicit_invariant
= true;
4883 earlier
->data
.invariant
= true;
4887 /* Invariant redeclarations do not have r-values.
4892 if (this->precise
) {
4893 assert(this->type
== NULL
);
4895 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
4896 assert(decl
->array_specifier
== NULL
);
4897 assert(decl
->initializer
== NULL
);
4899 ir_variable
*const earlier
=
4900 state
->symbols
->get_variable(decl
->identifier
);
4901 if (earlier
== NULL
) {
4902 _mesa_glsl_error(& loc
, state
,
4903 "undeclared variable `%s' cannot be marked "
4904 "precise", decl
->identifier
);
4905 } else if (state
->current_function
!= NULL
&&
4906 !state
->symbols
->name_declared_this_scope(decl
->identifier
)) {
4907 /* Note: we have to check if we're in a function, since
4908 * builtins are treated as having come from another scope.
4910 _mesa_glsl_error(& loc
, state
,
4911 "variable `%s' from an outer scope may not be "
4912 "redeclared `precise' in this scope",
4914 } else if (earlier
->data
.used
) {
4915 _mesa_glsl_error(& loc
, state
,
4916 "variable `%s' may not be redeclared "
4917 "`precise' after being used",
4920 earlier
->data
.precise
= true;
4924 /* Precise redeclarations do not have r-values either. */
4928 assert(this->type
!= NULL
);
4929 assert(!this->invariant
);
4930 assert(!this->precise
);
4932 /* GL_EXT_shader_image_load_store base type uses GLSL_TYPE_VOID as a special value to
4933 * indicate that it needs to be updated later (see glsl_parser.yy).
4934 * This is done here, based on the layout qualifier and the type of the image var
4936 if (this->type
->qualifier
.flags
.q
.explicit_image_format
&&
4937 this->type
->specifier
->type
->is_image() &&
4938 this->type
->qualifier
.image_base_type
== GLSL_TYPE_VOID
) {
4939 /* "The ARB_shader_image_load_store says:
4940 * If both extensions are enabled in the shading language, the "size*" layout
4941 * qualifiers are treated as format qualifiers, and are mapped to equivalent
4942 * format qualifiers in the table below, according to the type of image
4944 * image* iimage* uimage*
4945 * -------- -------- --------
4946 * size1x8 n/a r8i r8ui
4947 * size1x16 r16f r16i r16ui
4948 * size1x32 r32f r32i r32ui
4949 * size2x32 rg32f rg32i rg32ui
4950 * size4x32 rgba32f rgba32i rgba32ui"
4952 if (strncmp(this->type
->specifier
->type_name
, "image", strlen("image")) == 0) {
4953 switch (this->type
->qualifier
.image_format
) {
4954 case PIPE_FORMAT_R8_SINT
:
4955 /* No valid qualifier in this case, driver will need to look at
4956 * the underlying image's format (just like no qualifier being
4959 this->type
->qualifier
.image_format
= PIPE_FORMAT_NONE
;
4961 case PIPE_FORMAT_R16_SINT
:
4962 this->type
->qualifier
.image_format
= PIPE_FORMAT_R16_FLOAT
;
4964 case PIPE_FORMAT_R32_SINT
:
4965 this->type
->qualifier
.image_format
= PIPE_FORMAT_R32_FLOAT
;
4967 case PIPE_FORMAT_R32G32_SINT
:
4968 this->type
->qualifier
.image_format
= PIPE_FORMAT_R32G32_FLOAT
;
4970 case PIPE_FORMAT_R32G32B32A32_SINT
:
4971 this->type
->qualifier
.image_format
= PIPE_FORMAT_R32G32B32A32_FLOAT
;
4974 unreachable("Unknown image format");
4976 this->type
->qualifier
.image_base_type
= GLSL_TYPE_FLOAT
;
4977 } else if (strncmp(this->type
->specifier
->type_name
, "uimage", strlen("uimage")) == 0) {
4978 switch (this->type
->qualifier
.image_format
) {
4979 case PIPE_FORMAT_R8_SINT
:
4980 this->type
->qualifier
.image_format
= PIPE_FORMAT_R8_UINT
;
4982 case PIPE_FORMAT_R16_SINT
:
4983 this->type
->qualifier
.image_format
= PIPE_FORMAT_R16_UINT
;
4985 case PIPE_FORMAT_R32_SINT
:
4986 this->type
->qualifier
.image_format
= PIPE_FORMAT_R32_UINT
;
4988 case PIPE_FORMAT_R32G32_SINT
:
4989 this->type
->qualifier
.image_format
= PIPE_FORMAT_R32G32_UINT
;
4991 case PIPE_FORMAT_R32G32B32A32_SINT
:
4992 this->type
->qualifier
.image_format
= PIPE_FORMAT_R32G32B32A32_UINT
;
4995 unreachable("Unknown image format");
4997 this->type
->qualifier
.image_base_type
= GLSL_TYPE_UINT
;
4998 } else if (strncmp(this->type
->specifier
->type_name
, "iimage", strlen("iimage")) == 0) {
4999 this->type
->qualifier
.image_base_type
= GLSL_TYPE_INT
;
5005 /* The type specifier may contain a structure definition. Process that
5006 * before any of the variable declarations.
5008 (void) this->type
->specifier
->hir(instructions
, state
);
5010 decl_type
= this->type
->glsl_type(& type_name
, state
);
5012 /* Section 4.3.7 "Buffer Variables" of the GLSL 4.30 spec:
5013 * "Buffer variables may only be declared inside interface blocks
5014 * (section 4.3.9 “Interface Blocks”), which are then referred to as
5015 * shader storage blocks. It is a compile-time error to declare buffer
5016 * variables at global scope (outside a block)."
5018 if (type
->qualifier
.flags
.q
.buffer
&& !decl_type
->is_interface()) {
5019 _mesa_glsl_error(&loc
, state
,
5020 "buffer variables cannot be declared outside "
5021 "interface blocks");
5024 /* An offset-qualified atomic counter declaration sets the default
5025 * offset for the next declaration within the same atomic counter
5028 if (decl_type
&& decl_type
->contains_atomic()) {
5029 if (type
->qualifier
.flags
.q
.explicit_binding
&&
5030 type
->qualifier
.flags
.q
.explicit_offset
) {
5031 unsigned qual_binding
;
5032 unsigned qual_offset
;
5033 if (process_qualifier_constant(state
, &loc
, "binding",
5034 type
->qualifier
.binding
,
5036 && process_qualifier_constant(state
, &loc
, "offset",
5037 type
->qualifier
.offset
,
5039 if (qual_binding
< ARRAY_SIZE(state
->atomic_counter_offsets
))
5040 state
->atomic_counter_offsets
[qual_binding
] = qual_offset
;
5044 ast_type_qualifier allowed_atomic_qual_mask
;
5045 allowed_atomic_qual_mask
.flags
.i
= 0;
5046 allowed_atomic_qual_mask
.flags
.q
.explicit_binding
= 1;
5047 allowed_atomic_qual_mask
.flags
.q
.explicit_offset
= 1;
5048 allowed_atomic_qual_mask
.flags
.q
.uniform
= 1;
5050 type
->qualifier
.validate_flags(&loc
, state
, allowed_atomic_qual_mask
,
5051 "invalid layout qualifier for",
5055 if (this->declarations
.is_empty()) {
5056 /* If there is no structure involved in the program text, there are two
5057 * possible scenarios:
5059 * - The program text contained something like 'vec4;'. This is an
5060 * empty declaration. It is valid but weird. Emit a warning.
5062 * - The program text contained something like 'S;' and 'S' is not the
5063 * name of a known structure type. This is both invalid and weird.
5066 * - The program text contained something like 'mediump float;'
5067 * when the programmer probably meant 'precision mediump
5068 * float;' Emit a warning with a description of what they
5069 * probably meant to do.
5071 * Note that if decl_type is NULL and there is a structure involved,
5072 * there must have been some sort of error with the structure. In this
5073 * case we assume that an error was already generated on this line of
5074 * code for the structure. There is no need to generate an additional,
5077 assert(this->type
->specifier
->structure
== NULL
|| decl_type
!= NULL
5080 if (decl_type
== NULL
) {
5081 _mesa_glsl_error(&loc
, state
,
5082 "invalid type `%s' in empty declaration",
5085 if (decl_type
->is_array()) {
5086 /* From Section 13.22 (Array Declarations) of the GLSL ES 3.2
5089 * "... any declaration that leaves the size undefined is
5090 * disallowed as this would add complexity and there are no
5093 if (state
->es_shader
&& decl_type
->is_unsized_array()) {
5094 _mesa_glsl_error(&loc
, state
, "array size must be explicitly "
5095 "or implicitly defined");
5098 /* From Section 4.12 (Empty Declarations) of the GLSL 4.5 spec:
5100 * "The combinations of types and qualifiers that cause
5101 * compile-time or link-time errors are the same whether or not
5102 * the declaration is empty."
5104 validate_array_dimensions(decl_type
, state
, &loc
);
5107 if (decl_type
->is_atomic_uint()) {
5108 /* Empty atomic counter declarations are allowed and useful
5109 * to set the default offset qualifier.
5112 } else if (this->type
->qualifier
.precision
!= ast_precision_none
) {
5113 if (this->type
->specifier
->structure
!= NULL
) {
5114 _mesa_glsl_error(&loc
, state
,
5115 "precision qualifiers can't be applied "
5118 static const char *const precision_names
[] = {
5125 _mesa_glsl_warning(&loc
, state
,
5126 "empty declaration with precision "
5127 "qualifier, to set the default precision, "
5128 "use `precision %s %s;'",
5129 precision_names
[this->type
->
5130 qualifier
.precision
],
5133 } else if (this->type
->specifier
->structure
== NULL
) {
5134 _mesa_glsl_warning(&loc
, state
, "empty declaration");
5139 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
5140 const struct glsl_type
*var_type
;
5142 const char *identifier
= decl
->identifier
;
5143 /* FINISHME: Emit a warning if a variable declaration shadows a
5144 * FINISHME: declaration at a higher scope.
5147 if ((decl_type
== NULL
) || decl_type
->is_void()) {
5148 if (type_name
!= NULL
) {
5149 _mesa_glsl_error(& loc
, state
,
5150 "invalid type `%s' in declaration of `%s'",
5151 type_name
, decl
->identifier
);
5153 _mesa_glsl_error(& loc
, state
,
5154 "invalid type in declaration of `%s'",
5160 if (this->type
->qualifier
.is_subroutine_decl()) {
5164 t
= state
->symbols
->get_type(this->type
->specifier
->type_name
);
5166 _mesa_glsl_error(& loc
, state
,
5167 "invalid type in declaration of `%s'",
5169 name
= ralloc_asprintf(ctx
, "%s_%s", _mesa_shader_stage_to_subroutine_prefix(state
->stage
), decl
->identifier
);
5174 var_type
= process_array_type(&loc
, decl_type
, decl
->array_specifier
,
5177 var
= new(ctx
) ir_variable(var_type
, identifier
, ir_var_auto
);
5179 /* The 'varying in' and 'varying out' qualifiers can only be used with
5180 * ARB_geometry_shader4 and EXT_geometry_shader4, which we don't support
5183 if (this->type
->qualifier
.flags
.q
.varying
) {
5184 if (this->type
->qualifier
.flags
.q
.in
) {
5185 _mesa_glsl_error(& loc
, state
,
5186 "`varying in' qualifier in declaration of "
5187 "`%s' only valid for geometry shaders using "
5188 "ARB_geometry_shader4 or EXT_geometry_shader4",
5190 } else if (this->type
->qualifier
.flags
.q
.out
) {
5191 _mesa_glsl_error(& loc
, state
,
5192 "`varying out' qualifier in declaration of "
5193 "`%s' only valid for geometry shaders using "
5194 "ARB_geometry_shader4 or EXT_geometry_shader4",
5199 /* From page 22 (page 28 of the PDF) of the GLSL 1.10 specification;
5201 * "Global variables can only use the qualifiers const,
5202 * attribute, uniform, or varying. Only one may be
5205 * Local variables can only use the qualifier const."
5207 * This is relaxed in GLSL 1.30 and GLSL ES 3.00. It is also relaxed by
5208 * any extension that adds the 'layout' keyword.
5210 if (!state
->is_version(130, 300)
5211 && !state
->has_explicit_attrib_location()
5212 && !state
->has_separate_shader_objects()
5213 && !state
->ARB_fragment_coord_conventions_enable
) {
5214 /* GL_EXT_gpu_shader4 only allows "varying out" on fragment shader
5215 * outputs. (the varying flag is not set by the parser)
5217 if (this->type
->qualifier
.flags
.q
.out
&&
5218 (!state
->EXT_gpu_shader4_enable
||
5219 state
->stage
!= MESA_SHADER_FRAGMENT
)) {
5220 _mesa_glsl_error(& loc
, state
,
5221 "`out' qualifier in declaration of `%s' "
5222 "only valid for function parameters in %s",
5223 decl
->identifier
, state
->get_version_string());
5225 if (this->type
->qualifier
.flags
.q
.in
) {
5226 _mesa_glsl_error(& loc
, state
,
5227 "`in' qualifier in declaration of `%s' "
5228 "only valid for function parameters in %s",
5229 decl
->identifier
, state
->get_version_string());
5231 /* FINISHME: Test for other invalid qualifiers. */
5234 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
,
5236 apply_layout_qualifier_to_variable(&this->type
->qualifier
, var
, state
,
5239 if ((var
->data
.mode
== ir_var_auto
|| var
->data
.mode
== ir_var_temporary
5240 || var
->data
.mode
== ir_var_shader_out
)
5241 && (var
->type
->is_numeric() || var
->type
->is_boolean())
5242 && state
->zero_init
) {
5243 const ir_constant_data data
= { { 0 } };
5244 var
->data
.has_initializer
= true;
5245 var
->constant_initializer
= new(var
) ir_constant(var
->type
, &data
);
5248 if (this->type
->qualifier
.flags
.q
.invariant
) {
5249 if (!is_allowed_invariant(var
, state
)) {
5250 _mesa_glsl_error(&loc
, state
,
5251 "`%s' cannot be marked invariant; interfaces between "
5252 "shader stages only", var
->name
);
5256 if (state
->current_function
!= NULL
) {
5257 const char *mode
= NULL
;
5258 const char *extra
= "";
5260 /* There is no need to check for 'inout' here because the parser will
5261 * only allow that in function parameter lists.
5263 if (this->type
->qualifier
.flags
.q
.attribute
) {
5265 } else if (this->type
->qualifier
.is_subroutine_decl()) {
5266 mode
= "subroutine uniform";
5267 } else if (this->type
->qualifier
.flags
.q
.uniform
) {
5269 } else if (this->type
->qualifier
.flags
.q
.varying
) {
5271 } else if (this->type
->qualifier
.flags
.q
.in
) {
5273 extra
= " or in function parameter list";
5274 } else if (this->type
->qualifier
.flags
.q
.out
) {
5276 extra
= " or in function parameter list";
5280 _mesa_glsl_error(& loc
, state
,
5281 "%s variable `%s' must be declared at "
5283 mode
, var
->name
, extra
);
5285 } else if (var
->data
.mode
== ir_var_shader_in
) {
5286 var
->data
.read_only
= true;
5288 if (state
->stage
== MESA_SHADER_VERTEX
) {
5289 bool error_emitted
= false;
5291 /* From page 31 (page 37 of the PDF) of the GLSL 1.50 spec:
5293 * "Vertex shader inputs can only be float, floating-point
5294 * vectors, matrices, signed and unsigned integers and integer
5295 * vectors. Vertex shader inputs can also form arrays of these
5296 * types, but not structures."
5298 * From page 31 (page 27 of the PDF) of the GLSL 1.30 spec:
5300 * "Vertex shader inputs can only be float, floating-point
5301 * vectors, matrices, signed and unsigned integers and integer
5302 * vectors. They cannot be arrays or structures."
5304 * From page 23 (page 29 of the PDF) of the GLSL 1.20 spec:
5306 * "The attribute qualifier can be used only with float,
5307 * floating-point vectors, and matrices. Attribute variables
5308 * cannot be declared as arrays or structures."
5310 * From page 33 (page 39 of the PDF) of the GLSL ES 3.00 spec:
5312 * "Vertex shader inputs can only be float, floating-point
5313 * vectors, matrices, signed and unsigned integers and integer
5314 * vectors. Vertex shader inputs cannot be arrays or
5317 * From section 4.3.4 of the ARB_bindless_texture spec:
5319 * "(modify third paragraph of the section to allow sampler and
5320 * image types) ... Vertex shader inputs can only be float,
5321 * single-precision floating-point scalars, single-precision
5322 * floating-point vectors, matrices, signed and unsigned
5323 * integers and integer vectors, sampler and image types."
5325 const glsl_type
*check_type
= var
->type
->without_array();
5327 switch (check_type
->base_type
) {
5328 case GLSL_TYPE_FLOAT
:
5330 case GLSL_TYPE_UINT64
:
5331 case GLSL_TYPE_INT64
:
5333 case GLSL_TYPE_UINT
:
5335 if (state
->is_version(120, 300) || state
->EXT_gpu_shader4_enable
)
5337 case GLSL_TYPE_DOUBLE
:
5338 if (check_type
->is_double() && (state
->is_version(410, 0) || state
->ARB_vertex_attrib_64bit_enable
))
5340 case GLSL_TYPE_SAMPLER
:
5341 if (check_type
->is_sampler() && state
->has_bindless())
5343 case GLSL_TYPE_IMAGE
:
5344 if (check_type
->is_image() && state
->has_bindless())
5348 _mesa_glsl_error(& loc
, state
,
5349 "vertex shader input / attribute cannot have "
5351 var
->type
->is_array() ? "array of " : "",
5353 error_emitted
= true;
5356 if (!error_emitted
&& var
->type
->is_array() &&
5357 !state
->check_version(150, 0, &loc
,
5358 "vertex shader input / attribute "
5359 "cannot have array type")) {
5360 error_emitted
= true;
5362 } else if (state
->stage
== MESA_SHADER_GEOMETRY
) {
5363 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
5365 * Geometry shader input variables get the per-vertex values
5366 * written out by vertex shader output variables of the same
5367 * names. Since a geometry shader operates on a set of
5368 * vertices, each input varying variable (or input block, see
5369 * interface blocks below) needs to be declared as an array.
5371 if (!var
->type
->is_array()) {
5372 _mesa_glsl_error(&loc
, state
,
5373 "geometry shader inputs must be arrays");
5376 handle_geometry_shader_input_decl(state
, loc
, var
);
5377 } else if (state
->stage
== MESA_SHADER_FRAGMENT
) {
5378 /* From section 4.3.4 (Input Variables) of the GLSL ES 3.10 spec:
5380 * It is a compile-time error to declare a fragment shader
5381 * input with, or that contains, any of the following types:
5385 * * An array of arrays
5386 * * An array of structures
5387 * * A structure containing an array
5388 * * A structure containing a structure
5390 if (state
->es_shader
) {
5391 const glsl_type
*check_type
= var
->type
->without_array();
5392 if (check_type
->is_boolean() ||
5393 check_type
->contains_opaque()) {
5394 _mesa_glsl_error(&loc
, state
,
5395 "fragment shader input cannot have type %s",
5398 if (var
->type
->is_array() &&
5399 var
->type
->fields
.array
->is_array()) {
5400 _mesa_glsl_error(&loc
, state
,
5402 "cannot have an array of arrays",
5403 _mesa_shader_stage_to_string(state
->stage
));
5405 if (var
->type
->is_array() &&
5406 var
->type
->fields
.array
->is_struct()) {
5407 _mesa_glsl_error(&loc
, state
,
5408 "fragment shader input "
5409 "cannot have an array of structs");
5411 if (var
->type
->is_struct()) {
5412 for (unsigned i
= 0; i
< var
->type
->length
; i
++) {
5413 if (var
->type
->fields
.structure
[i
].type
->is_array() ||
5414 var
->type
->fields
.structure
[i
].type
->is_struct())
5415 _mesa_glsl_error(&loc
, state
,
5416 "fragment shader input cannot have "
5417 "a struct that contains an "
5422 } else if (state
->stage
== MESA_SHADER_TESS_CTRL
||
5423 state
->stage
== MESA_SHADER_TESS_EVAL
) {
5424 handle_tess_shader_input_decl(state
, loc
, var
);
5426 } else if (var
->data
.mode
== ir_var_shader_out
) {
5427 const glsl_type
*check_type
= var
->type
->without_array();
5429 /* From section 4.3.6 (Output variables) of the GLSL 4.40 spec:
5431 * It is a compile-time error to declare a fragment shader output
5432 * that contains any of the following:
5434 * * A Boolean type (bool, bvec2 ...)
5435 * * A double-precision scalar or vector (double, dvec2 ...)
5440 if (state
->stage
== MESA_SHADER_FRAGMENT
) {
5441 if (check_type
->is_struct() || check_type
->is_matrix())
5442 _mesa_glsl_error(&loc
, state
,
5443 "fragment shader output "
5444 "cannot have struct or matrix type");
5445 switch (check_type
->base_type
) {
5446 case GLSL_TYPE_UINT
:
5448 case GLSL_TYPE_FLOAT
:
5451 _mesa_glsl_error(&loc
, state
,
5452 "fragment shader output cannot have "
5453 "type %s", check_type
->name
);
5457 /* From section 4.3.6 (Output Variables) of the GLSL ES 3.10 spec:
5459 * It is a compile-time error to declare a vertex shader output
5460 * with, or that contains, any of the following types:
5464 * * An array of arrays
5465 * * An array of structures
5466 * * A structure containing an array
5467 * * A structure containing a structure
5469 * It is a compile-time error to declare a fragment shader output
5470 * with, or that contains, any of the following types:
5476 * * An array of array
5478 * ES 3.20 updates this to apply to tessellation and geometry shaders
5479 * as well. Because there are per-vertex arrays in the new stages,
5480 * it strikes the "array of..." rules and replaces them with these:
5482 * * For per-vertex-arrayed variables (applies to tessellation
5483 * control, tessellation evaluation and geometry shaders):
5485 * * Per-vertex-arrayed arrays of arrays
5486 * * Per-vertex-arrayed arrays of structures
5488 * * For non-per-vertex-arrayed variables:
5490 * * An array of arrays
5491 * * An array of structures
5493 * which basically says to unwrap the per-vertex aspect and apply
5496 if (state
->es_shader
) {
5497 if (var
->type
->is_array() &&
5498 var
->type
->fields
.array
->is_array()) {
5499 _mesa_glsl_error(&loc
, state
,
5501 "cannot have an array of arrays",
5502 _mesa_shader_stage_to_string(state
->stage
));
5504 if (state
->stage
<= MESA_SHADER_GEOMETRY
) {
5505 const glsl_type
*type
= var
->type
;
5507 if (state
->stage
== MESA_SHADER_TESS_CTRL
&&
5508 !var
->data
.patch
&& var
->type
->is_array()) {
5509 type
= var
->type
->fields
.array
;
5512 if (type
->is_array() && type
->fields
.array
->is_struct()) {
5513 _mesa_glsl_error(&loc
, state
,
5514 "%s shader output cannot have "
5515 "an array of structs",
5516 _mesa_shader_stage_to_string(state
->stage
));
5518 if (type
->is_struct()) {
5519 for (unsigned i
= 0; i
< type
->length
; i
++) {
5520 if (type
->fields
.structure
[i
].type
->is_array() ||
5521 type
->fields
.structure
[i
].type
->is_struct())
5522 _mesa_glsl_error(&loc
, state
,
5523 "%s shader output cannot have a "
5524 "struct that contains an "
5526 _mesa_shader_stage_to_string(state
->stage
));
5532 if (state
->stage
== MESA_SHADER_TESS_CTRL
) {
5533 handle_tess_ctrl_shader_output_decl(state
, loc
, var
);
5535 } else if (var
->type
->contains_subroutine()) {
5536 /* declare subroutine uniforms as hidden */
5537 var
->data
.how_declared
= ir_var_hidden
;
5540 /* From section 4.3.4 of the GLSL 4.00 spec:
5541 * "Input variables may not be declared using the patch in qualifier
5542 * in tessellation control or geometry shaders."
5544 * From section 4.3.6 of the GLSL 4.00 spec:
5545 * "It is an error to use patch out in a vertex, tessellation
5546 * evaluation, or geometry shader."
5548 * This doesn't explicitly forbid using them in a fragment shader, but
5549 * that's probably just an oversight.
5551 if (state
->stage
!= MESA_SHADER_TESS_EVAL
5552 && this->type
->qualifier
.flags
.q
.patch
5553 && this->type
->qualifier
.flags
.q
.in
) {
5555 _mesa_glsl_error(&loc
, state
, "'patch in' can only be used in a "
5556 "tessellation evaluation shader");
5559 if (state
->stage
!= MESA_SHADER_TESS_CTRL
5560 && this->type
->qualifier
.flags
.q
.patch
5561 && this->type
->qualifier
.flags
.q
.out
) {
5563 _mesa_glsl_error(&loc
, state
, "'patch out' can only be used in a "
5564 "tessellation control shader");
5567 /* Precision qualifiers exists only in GLSL versions 1.00 and >= 1.30.
5569 if (this->type
->qualifier
.precision
!= ast_precision_none
) {
5570 state
->check_precision_qualifiers_allowed(&loc
);
5573 if (this->type
->qualifier
.precision
!= ast_precision_none
&&
5574 !precision_qualifier_allowed(var
->type
)) {
5575 _mesa_glsl_error(&loc
, state
,
5576 "precision qualifiers apply only to floating point"
5577 ", integer and opaque types");
5580 /* From section 4.1.7 of the GLSL 4.40 spec:
5582 * "[Opaque types] can only be declared as function
5583 * parameters or uniform-qualified variables."
5585 * From section 4.1.7 of the ARB_bindless_texture spec:
5587 * "Samplers may be declared as shader inputs and outputs, as uniform
5588 * variables, as temporary variables, and as function parameters."
5590 * From section 4.1.X of the ARB_bindless_texture spec:
5592 * "Images may be declared as shader inputs and outputs, as uniform
5593 * variables, as temporary variables, and as function parameters."
5595 if (!this->type
->qualifier
.flags
.q
.uniform
&&
5596 (var_type
->contains_atomic() ||
5597 (!state
->has_bindless() && var_type
->contains_opaque()))) {
5598 _mesa_glsl_error(&loc
, state
,
5599 "%s variables must be declared uniform",
5600 state
->has_bindless() ? "atomic" : "opaque");
5603 /* Process the initializer and add its instructions to a temporary
5604 * list. This list will be added to the instruction stream (below) after
5605 * the declaration is added. This is done because in some cases (such as
5606 * redeclarations) the declaration may not actually be added to the
5607 * instruction stream.
5609 exec_list initializer_instructions
;
5611 /* Examine var name here since var may get deleted in the next call */
5612 bool var_is_gl_id
= is_gl_identifier(var
->name
);
5614 bool is_redeclaration
;
5615 var
= get_variable_being_redeclared(&var
, decl
->get_location(), state
,
5616 false /* allow_all_redeclarations */,
5618 if (is_redeclaration
) {
5620 var
->data
.how_declared
== ir_var_declared_in_block
) {
5621 _mesa_glsl_error(&loc
, state
,
5622 "`%s' has already been redeclared using "
5623 "gl_PerVertex", var
->name
);
5625 var
->data
.how_declared
= ir_var_declared_normally
;
5628 if (decl
->initializer
!= NULL
) {
5629 result
= process_initializer(var
,
5631 &initializer_instructions
, state
);
5633 validate_array_dimensions(var_type
, state
, &loc
);
5636 /* From page 23 (page 29 of the PDF) of the GLSL 1.10 spec:
5638 * "It is an error to write to a const variable outside of
5639 * its declaration, so they must be initialized when
5642 if (this->type
->qualifier
.flags
.q
.constant
&& decl
->initializer
== NULL
) {
5643 _mesa_glsl_error(& loc
, state
,
5644 "const declaration of `%s' must be initialized",
5648 if (state
->es_shader
) {
5649 const glsl_type
*const t
= var
->type
;
5651 /* Skip the unsized array check for TCS/TES/GS inputs & TCS outputs.
5653 * The GL_OES_tessellation_shader spec says about inputs:
5655 * "Declaring an array size is optional. If no size is specified,
5656 * it will be taken from the implementation-dependent maximum
5657 * patch size (gl_MaxPatchVertices)."
5659 * and about TCS outputs:
5661 * "If no size is specified, it will be taken from output patch
5662 * size declared in the shader."
5664 * The GL_OES_geometry_shader spec says:
5666 * "All geometry shader input unsized array declarations will be
5667 * sized by an earlier input primitive layout qualifier, when
5668 * present, as per the following table."
5670 const bool implicitly_sized
=
5671 (var
->data
.mode
== ir_var_shader_in
&&
5672 state
->stage
>= MESA_SHADER_TESS_CTRL
&&
5673 state
->stage
<= MESA_SHADER_GEOMETRY
) ||
5674 (var
->data
.mode
== ir_var_shader_out
&&
5675 state
->stage
== MESA_SHADER_TESS_CTRL
);
5677 if (t
->is_unsized_array() && !implicitly_sized
)
5678 /* Section 10.17 of the GLSL ES 1.00 specification states that
5679 * unsized array declarations have been removed from the language.
5680 * Arrays that are sized using an initializer are still explicitly
5681 * sized. However, GLSL ES 1.00 does not allow array
5682 * initializers. That is only allowed in GLSL ES 3.00.
5684 * Section 4.1.9 (Arrays) of the GLSL ES 3.00 spec says:
5686 * "An array type can also be formed without specifying a size
5687 * if the definition includes an initializer:
5689 * float x[] = float[2] (1.0, 2.0); // declares an array of size 2
5690 * float y[] = float[] (1.0, 2.0, 3.0); // declares an array of size 3
5695 _mesa_glsl_error(& loc
, state
,
5696 "unsized array declarations are not allowed in "
5700 /* Section 4.4.6.1 Atomic Counter Layout Qualifiers of the GLSL 4.60 spec:
5702 * "It is a compile-time error to declare an unsized array of
5705 if (var
->type
->is_unsized_array() &&
5706 var
->type
->without_array()->base_type
== GLSL_TYPE_ATOMIC_UINT
) {
5707 _mesa_glsl_error(& loc
, state
,
5708 "Unsized array of atomic_uint is not allowed");
5711 /* If the declaration is not a redeclaration, there are a few additional
5712 * semantic checks that must be applied. In addition, variable that was
5713 * created for the declaration should be added to the IR stream.
5715 if (!is_redeclaration
) {
5716 validate_identifier(decl
->identifier
, loc
, state
);
5718 /* Add the variable to the symbol table. Note that the initializer's
5719 * IR was already processed earlier (though it hasn't been emitted
5720 * yet), without the variable in scope.
5722 * This differs from most C-like languages, but it follows the GLSL
5723 * specification. From page 28 (page 34 of the PDF) of the GLSL 1.50
5726 * "Within a declaration, the scope of a name starts immediately
5727 * after the initializer if present or immediately after the name
5728 * being declared if not."
5730 if (!state
->symbols
->add_variable(var
)) {
5731 YYLTYPE loc
= this->get_location();
5732 _mesa_glsl_error(&loc
, state
, "name `%s' already taken in the "
5733 "current scope", decl
->identifier
);
5737 /* Push the variable declaration to the top. It means that all the
5738 * variable declarations will appear in a funny last-to-first order,
5739 * but otherwise we run into trouble if a function is prototyped, a
5740 * global var is decled, then the function is defined with usage of
5741 * the global var. See glslparsertest's CorrectModule.frag.
5743 instructions
->push_head(var
);
5746 instructions
->append_list(&initializer_instructions
);
5750 /* Generally, variable declarations do not have r-values. However,
5751 * one is used for the declaration in
5753 * while (bool b = some_condition()) {
5757 * so we return the rvalue from the last seen declaration here.
5764 ast_parameter_declarator::hir(exec_list
*instructions
,
5765 struct _mesa_glsl_parse_state
*state
)
5768 const struct glsl_type
*type
;
5769 const char *name
= NULL
;
5770 YYLTYPE loc
= this->get_location();
5772 type
= this->type
->glsl_type(& name
, state
);
5776 _mesa_glsl_error(& loc
, state
,
5777 "invalid type `%s' in declaration of `%s'",
5778 name
, this->identifier
);
5780 _mesa_glsl_error(& loc
, state
,
5781 "invalid type in declaration of `%s'",
5785 type
= glsl_type::error_type
;
5788 /* From page 62 (page 68 of the PDF) of the GLSL 1.50 spec:
5790 * "Functions that accept no input arguments need not use void in the
5791 * argument list because prototypes (or definitions) are required and
5792 * therefore there is no ambiguity when an empty argument list "( )" is
5793 * declared. The idiom "(void)" as a parameter list is provided for
5796 * Placing this check here prevents a void parameter being set up
5797 * for a function, which avoids tripping up checks for main taking
5798 * parameters and lookups of an unnamed symbol.
5800 if (type
->is_void()) {
5801 if (this->identifier
!= NULL
)
5802 _mesa_glsl_error(& loc
, state
,
5803 "named parameter cannot have type `void'");
5809 if (formal_parameter
&& (this->identifier
== NULL
)) {
5810 _mesa_glsl_error(& loc
, state
, "formal parameter lacks a name");
5814 /* This only handles "vec4 foo[..]". The earlier specifier->glsl_type(...)
5815 * call already handled the "vec4[..] foo" case.
5817 type
= process_array_type(&loc
, type
, this->array_specifier
, state
);
5819 if (!type
->is_error() && type
->is_unsized_array()) {
5820 _mesa_glsl_error(&loc
, state
, "arrays passed as parameters must have "
5822 type
= glsl_type::error_type
;
5826 ir_variable
*var
= new(ctx
)
5827 ir_variable(type
, this->identifier
, ir_var_function_in
);
5829 /* Apply any specified qualifiers to the parameter declaration. Note that
5830 * for function parameters the default mode is 'in'.
5832 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
, & loc
,
5835 /* From section 4.1.7 of the GLSL 4.40 spec:
5837 * "Opaque variables cannot be treated as l-values; hence cannot
5838 * be used as out or inout function parameters, nor can they be
5841 * From section 4.1.7 of the ARB_bindless_texture spec:
5843 * "Samplers can be used as l-values, so can be assigned into and used
5844 * as "out" and "inout" function parameters."
5846 * From section 4.1.X of the ARB_bindless_texture spec:
5848 * "Images can be used as l-values, so can be assigned into and used as
5849 * "out" and "inout" function parameters."
5851 if ((var
->data
.mode
== ir_var_function_inout
|| var
->data
.mode
== ir_var_function_out
)
5852 && (type
->contains_atomic() ||
5853 (!state
->has_bindless() && type
->contains_opaque()))) {
5854 _mesa_glsl_error(&loc
, state
, "out and inout parameters cannot "
5855 "contain %s variables",
5856 state
->has_bindless() ? "atomic" : "opaque");
5857 type
= glsl_type::error_type
;
5860 /* From page 39 (page 45 of the PDF) of the GLSL 1.10 spec:
5862 * "When calling a function, expressions that do not evaluate to
5863 * l-values cannot be passed to parameters declared as out or inout."
5865 * From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
5867 * "Other binary or unary expressions, non-dereferenced arrays,
5868 * function names, swizzles with repeated fields, and constants
5869 * cannot be l-values."
5871 * So for GLSL 1.10, passing an array as an out or inout parameter is not
5872 * allowed. This restriction is removed in GLSL 1.20, and in GLSL ES.
5874 if ((var
->data
.mode
== ir_var_function_inout
|| var
->data
.mode
== ir_var_function_out
)
5876 && !state
->check_version(120, 100, &loc
,
5877 "arrays cannot be out or inout parameters")) {
5878 type
= glsl_type::error_type
;
5881 instructions
->push_tail(var
);
5883 /* Parameter declarations do not have r-values.
5890 ast_parameter_declarator::parameters_to_hir(exec_list
*ast_parameters
,
5892 exec_list
*ir_parameters
,
5893 _mesa_glsl_parse_state
*state
)
5895 ast_parameter_declarator
*void_param
= NULL
;
5898 foreach_list_typed (ast_parameter_declarator
, param
, link
, ast_parameters
) {
5899 param
->formal_parameter
= formal
;
5900 param
->hir(ir_parameters
, state
);
5908 if ((void_param
!= NULL
) && (count
> 1)) {
5909 YYLTYPE loc
= void_param
->get_location();
5911 _mesa_glsl_error(& loc
, state
,
5912 "`void' parameter must be only parameter");
5918 emit_function(_mesa_glsl_parse_state
*state
, ir_function
*f
)
5920 /* IR invariants disallow function declarations or definitions
5921 * nested within other function definitions. But there is no
5922 * requirement about the relative order of function declarations
5923 * and definitions with respect to one another. So simply insert
5924 * the new ir_function block at the end of the toplevel instruction
5927 state
->toplevel_ir
->push_tail(f
);
5932 ast_function::hir(exec_list
*instructions
,
5933 struct _mesa_glsl_parse_state
*state
)
5936 ir_function
*f
= NULL
;
5937 ir_function_signature
*sig
= NULL
;
5938 exec_list hir_parameters
;
5939 YYLTYPE loc
= this->get_location();
5941 const char *const name
= identifier
;
5943 /* New functions are always added to the top-level IR instruction stream,
5944 * so this instruction list pointer is ignored. See also emit_function
5947 (void) instructions
;
5949 /* From page 21 (page 27 of the PDF) of the GLSL 1.20 spec,
5951 * "Function declarations (prototypes) cannot occur inside of functions;
5952 * they must be at global scope, or for the built-in functions, outside
5953 * the global scope."
5955 * From page 27 (page 33 of the PDF) of the GLSL ES 1.00.16 spec,
5957 * "User defined functions may only be defined within the global scope."
5959 * Note that this language does not appear in GLSL 1.10.
5961 if ((state
->current_function
!= NULL
) &&
5962 state
->is_version(120, 100)) {
5963 YYLTYPE loc
= this->get_location();
5964 _mesa_glsl_error(&loc
, state
,
5965 "declaration of function `%s' not allowed within "
5966 "function body", name
);
5969 validate_identifier(name
, this->get_location(), state
);
5971 /* Convert the list of function parameters to HIR now so that they can be
5972 * used below to compare this function's signature with previously seen
5973 * signatures for functions with the same name.
5975 ast_parameter_declarator::parameters_to_hir(& this->parameters
,
5977 & hir_parameters
, state
);
5979 const char *return_type_name
;
5980 const glsl_type
*return_type
=
5981 this->return_type
->glsl_type(& return_type_name
, state
);
5984 YYLTYPE loc
= this->get_location();
5985 _mesa_glsl_error(&loc
, state
,
5986 "function `%s' has undeclared return type `%s'",
5987 name
, return_type_name
);
5988 return_type
= glsl_type::error_type
;
5991 /* ARB_shader_subroutine states:
5992 * "Subroutine declarations cannot be prototyped. It is an error to prepend
5993 * subroutine(...) to a function declaration."
5995 if (this->return_type
->qualifier
.subroutine_list
&& !is_definition
) {
5996 YYLTYPE loc
= this->get_location();
5997 _mesa_glsl_error(&loc
, state
,
5998 "function declaration `%s' cannot have subroutine prepended",
6002 /* From page 56 (page 62 of the PDF) of the GLSL 1.30 spec:
6003 * "No qualifier is allowed on the return type of a function."
6005 if (this->return_type
->has_qualifiers(state
)) {
6006 YYLTYPE loc
= this->get_location();
6007 _mesa_glsl_error(& loc
, state
,
6008 "function `%s' return type has qualifiers", name
);
6011 /* Section 6.1 (Function Definitions) of the GLSL 1.20 spec says:
6013 * "Arrays are allowed as arguments and as the return type. In both
6014 * cases, the array must be explicitly sized."
6016 if (return_type
->is_unsized_array()) {
6017 YYLTYPE loc
= this->get_location();
6018 _mesa_glsl_error(& loc
, state
,
6019 "function `%s' return type array must be explicitly "
6023 /* From Section 6.1 (Function Definitions) of the GLSL 1.00 spec:
6025 * "Arrays are allowed as arguments, but not as the return type. [...]
6026 * The return type can also be a structure if the structure does not
6027 * contain an array."
6029 if (state
->language_version
== 100 && return_type
->contains_array()) {
6030 YYLTYPE loc
= this->get_location();
6031 _mesa_glsl_error(& loc
, state
,
6032 "function `%s' return type contains an array", name
);
6035 /* From section 4.1.7 of the GLSL 4.40 spec:
6037 * "[Opaque types] can only be declared as function parameters
6038 * or uniform-qualified variables."
6040 * The ARB_bindless_texture spec doesn't clearly state this, but as it says
6041 * "Replace Section 4.1.7 (Samplers), p. 25" and, "Replace Section 4.1.X,
6042 * (Images)", this should be allowed.
6044 if (return_type
->contains_atomic() ||
6045 (!state
->has_bindless() && return_type
->contains_opaque())) {
6046 YYLTYPE loc
= this->get_location();
6047 _mesa_glsl_error(&loc
, state
,
6048 "function `%s' return type can't contain an %s type",
6049 name
, state
->has_bindless() ? "atomic" : "opaque");
6053 if (return_type
->is_subroutine()) {
6054 YYLTYPE loc
= this->get_location();
6055 _mesa_glsl_error(&loc
, state
,
6056 "function `%s' return type can't be a subroutine type",
6060 /* Get the precision for the return type */
6061 unsigned return_precision
;
6063 if (state
->es_shader
) {
6064 YYLTYPE loc
= this->get_location();
6066 select_gles_precision(this->return_type
->qualifier
.precision
,
6071 return_precision
= GLSL_PRECISION_NONE
;
6074 /* Create an ir_function if one doesn't already exist. */
6075 f
= state
->symbols
->get_function(name
);
6077 f
= new(ctx
) ir_function(name
);
6078 if (!this->return_type
->qualifier
.is_subroutine_decl()) {
6079 if (!state
->symbols
->add_function(f
)) {
6080 /* This function name shadows a non-function use of the same name. */
6081 YYLTYPE loc
= this->get_location();
6082 _mesa_glsl_error(&loc
, state
, "function name `%s' conflicts with "
6083 "non-function", name
);
6087 emit_function(state
, f
);
6090 /* From GLSL ES 3.0 spec, chapter 6.1 "Function Definitions", page 71:
6092 * "A shader cannot redefine or overload built-in functions."
6094 * While in GLSL ES 1.0 specification, chapter 8 "Built-in Functions":
6096 * "User code can overload the built-in functions but cannot redefine
6099 if (state
->es_shader
) {
6100 /* Local shader has no exact candidates; check the built-ins. */
6101 if (state
->language_version
>= 300 &&
6102 _mesa_glsl_has_builtin_function(state
, name
)) {
6103 YYLTYPE loc
= this->get_location();
6104 _mesa_glsl_error(& loc
, state
,
6105 "A shader cannot redefine or overload built-in "
6106 "function `%s' in GLSL ES 3.00", name
);
6110 if (state
->language_version
== 100) {
6111 ir_function_signature
*sig
=
6112 _mesa_glsl_find_builtin_function(state
, name
, &hir_parameters
);
6113 if (sig
&& sig
->is_builtin()) {
6114 _mesa_glsl_error(& loc
, state
,
6115 "A shader cannot redefine built-in "
6116 "function `%s' in GLSL ES 1.00", name
);
6121 /* Verify that this function's signature either doesn't match a previously
6122 * seen signature for a function with the same name, or, if a match is found,
6123 * that the previously seen signature does not have an associated definition.
6125 if (state
->es_shader
|| f
->has_user_signature()) {
6126 sig
= f
->exact_matching_signature(state
, &hir_parameters
);
6128 const char *badvar
= sig
->qualifiers_match(&hir_parameters
);
6129 if (badvar
!= NULL
) {
6130 YYLTYPE loc
= this->get_location();
6132 _mesa_glsl_error(&loc
, state
, "function `%s' parameter `%s' "
6133 "qualifiers don't match prototype", name
, badvar
);
6136 if (sig
->return_type
!= return_type
) {
6137 YYLTYPE loc
= this->get_location();
6139 _mesa_glsl_error(&loc
, state
, "function `%s' return type doesn't "
6140 "match prototype", name
);
6143 if (sig
->return_precision
!= return_precision
) {
6144 YYLTYPE loc
= this->get_location();
6146 _mesa_glsl_error(&loc
, state
, "function `%s' return type precision "
6147 "doesn't match prototype", name
);
6150 if (sig
->is_defined
) {
6151 if (is_definition
) {
6152 YYLTYPE loc
= this->get_location();
6153 _mesa_glsl_error(& loc
, state
, "function `%s' redefined", name
);
6155 /* We just encountered a prototype that exactly matches a
6156 * function that's already been defined. This is redundant,
6157 * and we should ignore it.
6161 } else if (state
->language_version
== 100 && !is_definition
) {
6162 /* From the GLSL 1.00 spec, section 4.2.7:
6164 * "A particular variable, structure or function declaration
6165 * may occur at most once within a scope with the exception
6166 * that a single function prototype plus the corresponding
6167 * function definition are allowed."
6169 YYLTYPE loc
= this->get_location();
6170 _mesa_glsl_error(&loc
, state
, "function `%s' redeclared", name
);
6175 /* Verify the return type of main() */
6176 if (strcmp(name
, "main") == 0) {
6177 if (! return_type
->is_void()) {
6178 YYLTYPE loc
= this->get_location();
6180 _mesa_glsl_error(& loc
, state
, "main() must return void");
6183 if (!hir_parameters
.is_empty()) {
6184 YYLTYPE loc
= this->get_location();
6186 _mesa_glsl_error(& loc
, state
, "main() must not take any parameters");
6190 /* Finish storing the information about this new function in its signature.
6193 sig
= new(ctx
) ir_function_signature(return_type
);
6194 sig
->return_precision
= return_precision
;
6195 f
->add_signature(sig
);
6198 sig
->replace_parameters(&hir_parameters
);
6201 if (this->return_type
->qualifier
.subroutine_list
) {
6204 if (this->return_type
->qualifier
.flags
.q
.explicit_index
) {
6205 unsigned qual_index
;
6206 if (process_qualifier_constant(state
, &loc
, "index",
6207 this->return_type
->qualifier
.index
,
6209 if (!state
->has_explicit_uniform_location()) {
6210 _mesa_glsl_error(&loc
, state
, "subroutine index requires "
6211 "GL_ARB_explicit_uniform_location or "
6213 } else if (qual_index
>= MAX_SUBROUTINES
) {
6214 _mesa_glsl_error(&loc
, state
,
6215 "invalid subroutine index (%d) index must "
6216 "be a number between 0 and "
6217 "GL_MAX_SUBROUTINES - 1 (%d)", qual_index
,
6218 MAX_SUBROUTINES
- 1);
6220 f
->subroutine_index
= qual_index
;
6225 f
->num_subroutine_types
= this->return_type
->qualifier
.subroutine_list
->declarations
.length();
6226 f
->subroutine_types
= ralloc_array(state
, const struct glsl_type
*,
6227 f
->num_subroutine_types
);
6229 foreach_list_typed(ast_declaration
, decl
, link
, &this->return_type
->qualifier
.subroutine_list
->declarations
) {
6230 const struct glsl_type
*type
;
6231 /* the subroutine type must be already declared */
6232 type
= state
->symbols
->get_type(decl
->identifier
);
6234 _mesa_glsl_error(& loc
, state
, "unknown type '%s' in subroutine function definition", decl
->identifier
);
6237 for (int i
= 0; i
< state
->num_subroutine_types
; i
++) {
6238 ir_function
*fn
= state
->subroutine_types
[i
];
6239 ir_function_signature
*tsig
= NULL
;
6241 if (strcmp(fn
->name
, decl
->identifier
))
6244 tsig
= fn
->matching_signature(state
, &sig
->parameters
,
6247 _mesa_glsl_error(& loc
, state
, "subroutine type mismatch '%s' - signatures do not match\n", decl
->identifier
);
6249 if (tsig
->return_type
!= sig
->return_type
) {
6250 _mesa_glsl_error(& loc
, state
, "subroutine type mismatch '%s' - return types do not match\n", decl
->identifier
);
6254 f
->subroutine_types
[idx
++] = type
;
6256 state
->subroutines
= (ir_function
**)reralloc(state
, state
->subroutines
,
6258 state
->num_subroutines
+ 1);
6259 state
->subroutines
[state
->num_subroutines
] = f
;
6260 state
->num_subroutines
++;
6264 if (this->return_type
->qualifier
.is_subroutine_decl()) {
6265 if (!state
->symbols
->add_type(this->identifier
, glsl_type::get_subroutine_instance(this->identifier
))) {
6266 _mesa_glsl_error(& loc
, state
, "type '%s' previously defined", this->identifier
);
6269 state
->subroutine_types
= (ir_function
**)reralloc(state
, state
->subroutine_types
,
6271 state
->num_subroutine_types
+ 1);
6272 state
->subroutine_types
[state
->num_subroutine_types
] = f
;
6273 state
->num_subroutine_types
++;
6275 f
->is_subroutine
= true;
6278 /* Function declarations (prototypes) do not have r-values.
6285 ast_function_definition::hir(exec_list
*instructions
,
6286 struct _mesa_glsl_parse_state
*state
)
6288 prototype
->is_definition
= true;
6289 prototype
->hir(instructions
, state
);
6291 ir_function_signature
*signature
= prototype
->signature
;
6292 if (signature
== NULL
)
6295 assert(state
->current_function
== NULL
);
6296 state
->current_function
= signature
;
6297 state
->found_return
= false;
6298 state
->found_begin_interlock
= false;
6299 state
->found_end_interlock
= false;
6301 /* Duplicate parameters declared in the prototype as concrete variables.
6302 * Add these to the symbol table.
6304 state
->symbols
->push_scope();
6305 foreach_in_list(ir_variable
, var
, &signature
->parameters
) {
6306 assert(var
->as_variable() != NULL
);
6308 /* The only way a parameter would "exist" is if two parameters have
6311 if (state
->symbols
->name_declared_this_scope(var
->name
)) {
6312 YYLTYPE loc
= this->get_location();
6314 _mesa_glsl_error(& loc
, state
, "parameter `%s' redeclared", var
->name
);
6316 state
->symbols
->add_variable(var
);
6320 /* Convert the body of the function to HIR. */
6321 this->body
->hir(&signature
->body
, state
);
6322 signature
->is_defined
= true;
6324 state
->symbols
->pop_scope();
6326 assert(state
->current_function
== signature
);
6327 state
->current_function
= NULL
;
6329 if (!signature
->return_type
->is_void() && !state
->found_return
) {
6330 YYLTYPE loc
= this->get_location();
6331 _mesa_glsl_error(& loc
, state
, "function `%s' has non-void return type "
6332 "%s, but no return statement",
6333 signature
->function_name(),
6334 signature
->return_type
->name
);
6337 /* Function definitions do not have r-values.
6344 ast_jump_statement::hir(exec_list
*instructions
,
6345 struct _mesa_glsl_parse_state
*state
)
6352 assert(state
->current_function
);
6354 if (opt_return_value
) {
6355 ir_rvalue
*ret
= opt_return_value
->hir(instructions
, state
);
6357 /* The value of the return type can be NULL if the shader says
6358 * 'return foo();' and foo() is a function that returns void.
6360 * NOTE: The GLSL spec doesn't say that this is an error. The type
6361 * of the return value is void. If the return type of the function is
6362 * also void, then this should compile without error. Seriously.
6364 const glsl_type
*const ret_type
=
6365 (ret
== NULL
) ? glsl_type::void_type
: ret
->type
;
6367 /* Implicit conversions are not allowed for return values prior to
6368 * ARB_shading_language_420pack.
6370 if (state
->current_function
->return_type
!= ret_type
) {
6371 YYLTYPE loc
= this->get_location();
6373 if (state
->has_420pack()) {
6374 if (!apply_implicit_conversion(state
->current_function
->return_type
,
6376 || (ret
->type
!= state
->current_function
->return_type
)) {
6377 _mesa_glsl_error(& loc
, state
,
6378 "could not implicitly convert return value "
6379 "to %s, in function `%s'",
6380 state
->current_function
->return_type
->name
,
6381 state
->current_function
->function_name());
6384 _mesa_glsl_error(& loc
, state
,
6385 "`return' with wrong type %s, in function `%s' "
6388 state
->current_function
->function_name(),
6389 state
->current_function
->return_type
->name
);
6391 } else if (state
->current_function
->return_type
->base_type
==
6393 YYLTYPE loc
= this->get_location();
6395 /* The ARB_shading_language_420pack, GLSL ES 3.0, and GLSL 4.20
6396 * specs add a clarification:
6398 * "A void function can only use return without a return argument, even if
6399 * the return argument has void type. Return statements only accept values:
6402 * void func2() { return func1(); } // illegal return statement"
6404 _mesa_glsl_error(& loc
, state
,
6405 "void functions can only use `return' without a "
6409 inst
= new(ctx
) ir_return(ret
);
6411 if (state
->current_function
->return_type
->base_type
!=
6413 YYLTYPE loc
= this->get_location();
6415 _mesa_glsl_error(& loc
, state
,
6416 "`return' with no value, in function %s returning "
6418 state
->current_function
->function_name());
6420 inst
= new(ctx
) ir_return
;
6423 state
->found_return
= true;
6424 instructions
->push_tail(inst
);
6429 if (state
->stage
!= MESA_SHADER_FRAGMENT
) {
6430 YYLTYPE loc
= this->get_location();
6432 _mesa_glsl_error(& loc
, state
,
6433 "`discard' may only appear in a fragment shader");
6435 instructions
->push_tail(new(ctx
) ir_discard
);
6440 if (mode
== ast_continue
&&
6441 state
->loop_nesting_ast
== NULL
) {
6442 YYLTYPE loc
= this->get_location();
6444 _mesa_glsl_error(& loc
, state
, "continue may only appear in a loop");
6445 } else if (mode
== ast_break
&&
6446 state
->loop_nesting_ast
== NULL
&&
6447 state
->switch_state
.switch_nesting_ast
== NULL
) {
6448 YYLTYPE loc
= this->get_location();
6450 _mesa_glsl_error(& loc
, state
,
6451 "break may only appear in a loop or a switch");
6453 /* For a loop, inline the for loop expression again, since we don't
6454 * know where near the end of the loop body the normal copy of it is
6455 * going to be placed. Same goes for the condition for a do-while
6458 if (state
->loop_nesting_ast
!= NULL
&&
6459 mode
== ast_continue
&& !state
->switch_state
.is_switch_innermost
) {
6460 if (state
->loop_nesting_ast
->rest_expression
) {
6461 state
->loop_nesting_ast
->rest_expression
->hir(instructions
,
6464 if (state
->loop_nesting_ast
->mode
==
6465 ast_iteration_statement::ast_do_while
) {
6466 state
->loop_nesting_ast
->condition_to_hir(instructions
, state
);
6470 if (state
->switch_state
.is_switch_innermost
&&
6471 mode
== ast_continue
) {
6472 /* Set 'continue_inside' to true. */
6473 ir_rvalue
*const true_val
= new (ctx
) ir_constant(true);
6474 ir_dereference_variable
*deref_continue_inside_var
=
6475 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
6476 instructions
->push_tail(new(ctx
) ir_assignment(deref_continue_inside_var
,
6479 /* Break out from the switch, continue for the loop will
6480 * be called right after switch. */
6481 ir_loop_jump
*const jump
=
6482 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
6483 instructions
->push_tail(jump
);
6485 } else if (state
->switch_state
.is_switch_innermost
&&
6486 mode
== ast_break
) {
6487 /* Force break out of switch by inserting a break. */
6488 ir_loop_jump
*const jump
=
6489 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
6490 instructions
->push_tail(jump
);
6492 ir_loop_jump
*const jump
=
6493 new(ctx
) ir_loop_jump((mode
== ast_break
)
6494 ? ir_loop_jump::jump_break
6495 : ir_loop_jump::jump_continue
);
6496 instructions
->push_tail(jump
);
6503 /* Jump instructions do not have r-values.
6510 ast_demote_statement::hir(exec_list
*instructions
,
6511 struct _mesa_glsl_parse_state
*state
)
6515 if (state
->stage
!= MESA_SHADER_FRAGMENT
) {
6516 YYLTYPE loc
= this->get_location();
6518 _mesa_glsl_error(& loc
, state
,
6519 "`demote' may only appear in a fragment shader");
6522 instructions
->push_tail(new(ctx
) ir_demote
);
6529 ast_selection_statement::hir(exec_list
*instructions
,
6530 struct _mesa_glsl_parse_state
*state
)
6534 ir_rvalue
*const condition
= this->condition
->hir(instructions
, state
);
6536 /* From page 66 (page 72 of the PDF) of the GLSL 1.50 spec:
6538 * "Any expression whose type evaluates to a Boolean can be used as the
6539 * conditional expression bool-expression. Vector types are not accepted
6540 * as the expression to if."
6542 * The checks are separated so that higher quality diagnostics can be
6543 * generated for cases where both rules are violated.
6545 if (!condition
->type
->is_boolean() || !condition
->type
->is_scalar()) {
6546 YYLTYPE loc
= this->condition
->get_location();
6548 _mesa_glsl_error(& loc
, state
, "if-statement condition must be scalar "
6552 ir_if
*const stmt
= new(ctx
) ir_if(condition
);
6554 if (then_statement
!= NULL
) {
6555 state
->symbols
->push_scope();
6556 then_statement
->hir(& stmt
->then_instructions
, state
);
6557 state
->symbols
->pop_scope();
6560 if (else_statement
!= NULL
) {
6561 state
->symbols
->push_scope();
6562 else_statement
->hir(& stmt
->else_instructions
, state
);
6563 state
->symbols
->pop_scope();
6566 instructions
->push_tail(stmt
);
6568 /* if-statements do not have r-values.
6575 /** Value of the case label. */
6578 /** Does this label occur after the default? */
6582 * AST for the case label.
6584 * This is only used to generate error messages for duplicate labels.
6586 ast_expression
*ast
;
6589 /* Used for detection of duplicate case values, compare
6590 * given contents directly.
6593 compare_case_value(const void *a
, const void *b
)
6595 return ((struct case_label
*) a
)->value
== ((struct case_label
*) b
)->value
;
6599 /* Used for detection of duplicate case values, just
6600 * returns key contents as is.
6603 key_contents(const void *key
)
6605 return ((struct case_label
*) key
)->value
;
6610 ast_switch_statement::hir(exec_list
*instructions
,
6611 struct _mesa_glsl_parse_state
*state
)
6615 ir_rvalue
*const test_expression
=
6616 this->test_expression
->hir(instructions
, state
);
6618 /* From page 66 (page 55 of the PDF) of the GLSL 1.50 spec:
6620 * "The type of init-expression in a switch statement must be a
6623 if (!test_expression
->type
->is_scalar() ||
6624 !test_expression
->type
->is_integer_32()) {
6625 YYLTYPE loc
= this->test_expression
->get_location();
6627 _mesa_glsl_error(& loc
,
6629 "switch-statement expression must be scalar "
6634 /* Track the switch-statement nesting in a stack-like manner.
6636 struct glsl_switch_state saved
= state
->switch_state
;
6638 state
->switch_state
.is_switch_innermost
= true;
6639 state
->switch_state
.switch_nesting_ast
= this;
6640 state
->switch_state
.labels_ht
=
6641 _mesa_hash_table_create(NULL
, key_contents
,
6642 compare_case_value
);
6643 state
->switch_state
.previous_default
= NULL
;
6645 /* Initalize is_fallthru state to false.
6647 ir_rvalue
*const is_fallthru_val
= new (ctx
) ir_constant(false);
6648 state
->switch_state
.is_fallthru_var
=
6649 new(ctx
) ir_variable(glsl_type::bool_type
,
6650 "switch_is_fallthru_tmp",
6652 instructions
->push_tail(state
->switch_state
.is_fallthru_var
);
6654 ir_dereference_variable
*deref_is_fallthru_var
=
6655 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
6656 instructions
->push_tail(new(ctx
) ir_assignment(deref_is_fallthru_var
,
6659 /* Initialize continue_inside state to false.
6661 state
->switch_state
.continue_inside
=
6662 new(ctx
) ir_variable(glsl_type::bool_type
,
6663 "continue_inside_tmp",
6665 instructions
->push_tail(state
->switch_state
.continue_inside
);
6667 ir_rvalue
*const false_val
= new (ctx
) ir_constant(false);
6668 ir_dereference_variable
*deref_continue_inside_var
=
6669 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
6670 instructions
->push_tail(new(ctx
) ir_assignment(deref_continue_inside_var
,
6673 state
->switch_state
.run_default
=
6674 new(ctx
) ir_variable(glsl_type::bool_type
,
6677 instructions
->push_tail(state
->switch_state
.run_default
);
6679 /* Loop around the switch is used for flow control. */
6680 ir_loop
* loop
= new(ctx
) ir_loop();
6681 instructions
->push_tail(loop
);
6683 /* Cache test expression.
6685 test_to_hir(&loop
->body_instructions
, state
);
6687 /* Emit code for body of switch stmt.
6689 body
->hir(&loop
->body_instructions
, state
);
6691 /* Insert a break at the end to exit loop. */
6692 ir_loop_jump
*jump
= new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
6693 loop
->body_instructions
.push_tail(jump
);
6695 /* If we are inside loop, check if continue got called inside switch. */
6696 if (state
->loop_nesting_ast
!= NULL
) {
6697 ir_dereference_variable
*deref_continue_inside
=
6698 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
6699 ir_if
*irif
= new(ctx
) ir_if(deref_continue_inside
);
6700 ir_loop_jump
*jump
= new(ctx
) ir_loop_jump(ir_loop_jump::jump_continue
);
6702 if (state
->loop_nesting_ast
!= NULL
) {
6703 if (state
->loop_nesting_ast
->rest_expression
) {
6704 state
->loop_nesting_ast
->rest_expression
->hir(&irif
->then_instructions
,
6707 if (state
->loop_nesting_ast
->mode
==
6708 ast_iteration_statement::ast_do_while
) {
6709 state
->loop_nesting_ast
->condition_to_hir(&irif
->then_instructions
, state
);
6712 irif
->then_instructions
.push_tail(jump
);
6713 instructions
->push_tail(irif
);
6716 _mesa_hash_table_destroy(state
->switch_state
.labels_ht
, NULL
);
6718 state
->switch_state
= saved
;
6720 /* Switch statements do not have r-values. */
6726 ast_switch_statement::test_to_hir(exec_list
*instructions
,
6727 struct _mesa_glsl_parse_state
*state
)
6731 /* set to true to avoid a duplicate "use of uninitialized variable" warning
6732 * on the switch test case. The first one would be already raised when
6733 * getting the test_expression at ast_switch_statement::hir
6735 test_expression
->set_is_lhs(true);
6736 /* Cache value of test expression. */
6737 ir_rvalue
*const test_val
= test_expression
->hir(instructions
, state
);
6739 state
->switch_state
.test_var
= new(ctx
) ir_variable(test_val
->type
,
6742 ir_dereference_variable
*deref_test_var
=
6743 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
6745 instructions
->push_tail(state
->switch_state
.test_var
);
6746 instructions
->push_tail(new(ctx
) ir_assignment(deref_test_var
, test_val
));
6751 ast_switch_body::hir(exec_list
*instructions
,
6752 struct _mesa_glsl_parse_state
*state
)
6755 stmts
->hir(instructions
, state
);
6757 /* Switch bodies do not have r-values. */
6762 ast_case_statement_list::hir(exec_list
*instructions
,
6763 struct _mesa_glsl_parse_state
*state
)
6765 exec_list default_case
, after_default
, tmp
;
6767 foreach_list_typed (ast_case_statement
, case_stmt
, link
, & this->cases
) {
6768 case_stmt
->hir(&tmp
, state
);
6771 if (state
->switch_state
.previous_default
&& default_case
.is_empty()) {
6772 default_case
.append_list(&tmp
);
6776 /* If default case found, append 'after_default' list. */
6777 if (!default_case
.is_empty())
6778 after_default
.append_list(&tmp
);
6780 instructions
->append_list(&tmp
);
6783 /* Handle the default case. This is done here because default might not be
6784 * the last case. We need to add checks against following cases first to see
6785 * if default should be chosen or not.
6787 if (!default_case
.is_empty()) {
6788 ir_factory
body(instructions
, state
);
6790 ir_expression
*cmp
= NULL
;
6792 hash_table_foreach(state
->switch_state
.labels_ht
, entry
) {
6793 const struct case_label
*const l
= (struct case_label
*) entry
->data
;
6795 /* If the switch init-value is the value of one of the labels that
6796 * occurs after the default case, disable execution of the default
6799 if (l
->after_default
) {
6800 ir_constant
*const cnst
=
6801 state
->switch_state
.test_var
->type
->base_type
== GLSL_TYPE_UINT
6802 ? body
.constant(unsigned(l
->value
))
6803 : body
.constant(int(l
->value
));
6806 ? equal(cnst
, state
->switch_state
.test_var
)
6807 : logic_or(cmp
, equal(cnst
, state
->switch_state
.test_var
));
6812 body
.emit(assign(state
->switch_state
.run_default
, logic_not(cmp
)));
6814 body
.emit(assign(state
->switch_state
.run_default
, body
.constant(true)));
6816 /* Append default case and all cases after it. */
6817 instructions
->append_list(&default_case
);
6818 instructions
->append_list(&after_default
);
6821 /* Case statements do not have r-values. */
6826 ast_case_statement::hir(exec_list
*instructions
,
6827 struct _mesa_glsl_parse_state
*state
)
6829 labels
->hir(instructions
, state
);
6831 /* Guard case statements depending on fallthru state. */
6832 ir_dereference_variable
*const deref_fallthru_guard
=
6833 new(state
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
6834 ir_if
*const test_fallthru
= new(state
) ir_if(deref_fallthru_guard
);
6836 foreach_list_typed (ast_node
, stmt
, link
, & this->stmts
)
6837 stmt
->hir(& test_fallthru
->then_instructions
, state
);
6839 instructions
->push_tail(test_fallthru
);
6841 /* Case statements do not have r-values. */
6847 ast_case_label_list::hir(exec_list
*instructions
,
6848 struct _mesa_glsl_parse_state
*state
)
6850 foreach_list_typed (ast_case_label
, label
, link
, & this->labels
)
6851 label
->hir(instructions
, state
);
6853 /* Case labels do not have r-values. */
6858 ast_case_label::hir(exec_list
*instructions
,
6859 struct _mesa_glsl_parse_state
*state
)
6861 ir_factory
body(instructions
, state
);
6863 ir_variable
*const fallthru_var
= state
->switch_state
.is_fallthru_var
;
6865 /* If not default case, ... */
6866 if (this->test_value
!= NULL
) {
6867 /* Conditionally set fallthru state based on
6868 * comparison of cached test expression value to case label.
6870 ir_rvalue
*const label_rval
= this->test_value
->hir(instructions
, state
);
6871 ir_constant
*label_const
=
6872 label_rval
->constant_expression_value(body
.mem_ctx
);
6875 YYLTYPE loc
= this->test_value
->get_location();
6877 _mesa_glsl_error(& loc
, state
,
6878 "switch statement case label must be a "
6879 "constant expression");
6881 /* Stuff a dummy value in to allow processing to continue. */
6882 label_const
= body
.constant(0);
6885 _mesa_hash_table_search(state
->switch_state
.labels_ht
,
6886 &label_const
->value
.u
[0]);
6889 const struct case_label
*const l
=
6890 (struct case_label
*) entry
->data
;
6891 const ast_expression
*const previous_label
= l
->ast
;
6892 YYLTYPE loc
= this->test_value
->get_location();
6894 _mesa_glsl_error(& loc
, state
, "duplicate case value");
6896 loc
= previous_label
->get_location();
6897 _mesa_glsl_error(& loc
, state
, "this is the previous case label");
6899 struct case_label
*l
= ralloc(state
->switch_state
.labels_ht
,
6902 l
->value
= label_const
->value
.u
[0];
6903 l
->after_default
= state
->switch_state
.previous_default
!= NULL
;
6904 l
->ast
= this->test_value
;
6906 _mesa_hash_table_insert(state
->switch_state
.labels_ht
,
6907 &label_const
->value
.u
[0],
6912 /* Create an r-value version of the ir_constant label here (after we may
6913 * have created a fake one in error cases) that can be passed to
6914 * apply_implicit_conversion below.
6916 ir_rvalue
*label
= label_const
;
6918 ir_rvalue
*deref_test_var
=
6919 new(body
.mem_ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
6922 * From GLSL 4.40 specification section 6.2 ("Selection"):
6924 * "The type of the init-expression value in a switch statement must
6925 * be a scalar int or uint. The type of the constant-expression value
6926 * in a case label also must be a scalar int or uint. When any pair
6927 * of these values is tested for "equal value" and the types do not
6928 * match, an implicit conversion will be done to convert the int to a
6929 * uint (see section 4.1.10 “Implicit Conversions”) before the compare
6932 if (label
->type
!= state
->switch_state
.test_var
->type
) {
6933 YYLTYPE loc
= this->test_value
->get_location();
6935 const glsl_type
*type_a
= label
->type
;
6936 const glsl_type
*type_b
= state
->switch_state
.test_var
->type
;
6938 /* Check if int->uint implicit conversion is supported. */
6939 bool integer_conversion_supported
=
6940 glsl_type::int_type
->can_implicitly_convert_to(glsl_type::uint_type
,
6943 if ((!type_a
->is_integer_32() || !type_b
->is_integer_32()) ||
6944 !integer_conversion_supported
) {
6945 _mesa_glsl_error(&loc
, state
, "type mismatch with switch "
6946 "init-expression and case label (%s != %s)",
6947 type_a
->name
, type_b
->name
);
6949 /* Conversion of the case label. */
6950 if (type_a
->base_type
== GLSL_TYPE_INT
) {
6951 if (!apply_implicit_conversion(glsl_type::uint_type
,
6953 _mesa_glsl_error(&loc
, state
, "implicit type conversion error");
6955 /* Conversion of the init-expression value. */
6956 if (!apply_implicit_conversion(glsl_type::uint_type
,
6957 deref_test_var
, state
))
6958 _mesa_glsl_error(&loc
, state
, "implicit type conversion error");
6962 /* If the implicit conversion was allowed, the types will already be
6963 * the same. If the implicit conversion wasn't allowed, smash the
6964 * type of the label anyway. This will prevent the expression
6965 * constructor (below) from failing an assertion.
6967 label
->type
= deref_test_var
->type
;
6970 body
.emit(assign(fallthru_var
,
6971 logic_or(fallthru_var
, equal(label
, deref_test_var
))));
6972 } else { /* default case */
6973 if (state
->switch_state
.previous_default
) {
6974 YYLTYPE loc
= this->get_location();
6975 _mesa_glsl_error(& loc
, state
,
6976 "multiple default labels in one switch");
6978 loc
= state
->switch_state
.previous_default
->get_location();
6979 _mesa_glsl_error(& loc
, state
, "this is the first default label");
6981 state
->switch_state
.previous_default
= this;
6983 /* Set fallthru condition on 'run_default' bool. */
6984 body
.emit(assign(fallthru_var
,
6985 logic_or(fallthru_var
,
6986 state
->switch_state
.run_default
)));
6989 /* Case statements do not have r-values. */
6994 ast_iteration_statement::condition_to_hir(exec_list
*instructions
,
6995 struct _mesa_glsl_parse_state
*state
)
6999 if (condition
!= NULL
) {
7000 ir_rvalue
*const cond
=
7001 condition
->hir(instructions
, state
);
7004 || !cond
->type
->is_boolean() || !cond
->type
->is_scalar()) {
7005 YYLTYPE loc
= condition
->get_location();
7007 _mesa_glsl_error(& loc
, state
,
7008 "loop condition must be scalar boolean");
7010 /* As the first code in the loop body, generate a block that looks
7011 * like 'if (!condition) break;' as the loop termination condition.
7013 ir_rvalue
*const not_cond
=
7014 new(ctx
) ir_expression(ir_unop_logic_not
, cond
);
7016 ir_if
*const if_stmt
= new(ctx
) ir_if(not_cond
);
7018 ir_jump
*const break_stmt
=
7019 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
7021 if_stmt
->then_instructions
.push_tail(break_stmt
);
7022 instructions
->push_tail(if_stmt
);
7029 ast_iteration_statement::hir(exec_list
*instructions
,
7030 struct _mesa_glsl_parse_state
*state
)
7034 /* For-loops and while-loops start a new scope, but do-while loops do not.
7036 if (mode
!= ast_do_while
)
7037 state
->symbols
->push_scope();
7039 if (init_statement
!= NULL
)
7040 init_statement
->hir(instructions
, state
);
7042 ir_loop
*const stmt
= new(ctx
) ir_loop();
7043 instructions
->push_tail(stmt
);
7045 /* Track the current loop nesting. */
7046 ast_iteration_statement
*nesting_ast
= state
->loop_nesting_ast
;
7048 state
->loop_nesting_ast
= this;
7050 /* Likewise, indicate that following code is closest to a loop,
7051 * NOT closest to a switch.
7053 bool saved_is_switch_innermost
= state
->switch_state
.is_switch_innermost
;
7054 state
->switch_state
.is_switch_innermost
= false;
7056 if (mode
!= ast_do_while
)
7057 condition_to_hir(&stmt
->body_instructions
, state
);
7060 body
->hir(& stmt
->body_instructions
, state
);
7062 if (rest_expression
!= NULL
)
7063 rest_expression
->hir(& stmt
->body_instructions
, state
);
7065 if (mode
== ast_do_while
)
7066 condition_to_hir(&stmt
->body_instructions
, state
);
7068 if (mode
!= ast_do_while
)
7069 state
->symbols
->pop_scope();
7071 /* Restore previous nesting before returning. */
7072 state
->loop_nesting_ast
= nesting_ast
;
7073 state
->switch_state
.is_switch_innermost
= saved_is_switch_innermost
;
7075 /* Loops do not have r-values.
7082 * Determine if the given type is valid for establishing a default precision
7085 * From GLSL ES 3.00 section 4.5.4 ("Default Precision Qualifiers"):
7087 * "The precision statement
7089 * precision precision-qualifier type;
7091 * can be used to establish a default precision qualifier. The type field
7092 * can be either int or float or any of the sampler types, and the
7093 * precision-qualifier can be lowp, mediump, or highp."
7095 * GLSL ES 1.00 has similar language. GLSL 1.30 doesn't allow precision
7096 * qualifiers on sampler types, but this seems like an oversight (since the
7097 * intention of including these in GLSL 1.30 is to allow compatibility with ES
7098 * shaders). So we allow int, float, and all sampler types regardless of GLSL
7102 is_valid_default_precision_type(const struct glsl_type
*const type
)
7107 switch (type
->base_type
) {
7109 case GLSL_TYPE_FLOAT
:
7110 /* "int" and "float" are valid, but vectors and matrices are not. */
7111 return type
->vector_elements
== 1 && type
->matrix_columns
== 1;
7112 case GLSL_TYPE_SAMPLER
:
7113 case GLSL_TYPE_IMAGE
:
7114 case GLSL_TYPE_ATOMIC_UINT
:
7123 ast_type_specifier::hir(exec_list
*instructions
,
7124 struct _mesa_glsl_parse_state
*state
)
7126 if (this->default_precision
== ast_precision_none
&& this->structure
== NULL
)
7129 YYLTYPE loc
= this->get_location();
7131 /* If this is a precision statement, check that the type to which it is
7132 * applied is either float or int.
7134 * From section 4.5.3 of the GLSL 1.30 spec:
7135 * "The precision statement
7136 * precision precision-qualifier type;
7137 * can be used to establish a default precision qualifier. The type
7138 * field can be either int or float [...]. Any other types or
7139 * qualifiers will result in an error.
7141 if (this->default_precision
!= ast_precision_none
) {
7142 if (!state
->check_precision_qualifiers_allowed(&loc
))
7145 if (this->structure
!= NULL
) {
7146 _mesa_glsl_error(&loc
, state
,
7147 "precision qualifiers do not apply to structures");
7151 if (this->array_specifier
!= NULL
) {
7152 _mesa_glsl_error(&loc
, state
,
7153 "default precision statements do not apply to "
7158 const struct glsl_type
*const type
=
7159 state
->symbols
->get_type(this->type_name
);
7160 if (!is_valid_default_precision_type(type
)) {
7161 _mesa_glsl_error(&loc
, state
,
7162 "default precision statements apply only to "
7163 "float, int, and opaque types");
7167 if (state
->es_shader
) {
7168 /* Section 4.5.3 (Default Precision Qualifiers) of the GLSL ES 1.00
7171 * "Non-precision qualified declarations will use the precision
7172 * qualifier specified in the most recent precision statement
7173 * that is still in scope. The precision statement has the same
7174 * scoping rules as variable declarations. If it is declared
7175 * inside a compound statement, its effect stops at the end of
7176 * the innermost statement it was declared in. Precision
7177 * statements in nested scopes override precision statements in
7178 * outer scopes. Multiple precision statements for the same basic
7179 * type can appear inside the same scope, with later statements
7180 * overriding earlier statements within that scope."
7182 * Default precision specifications follow the same scope rules as
7183 * variables. So, we can track the state of the default precision
7184 * qualifiers in the symbol table, and the rules will just work. This
7185 * is a slight abuse of the symbol table, but it has the semantics
7188 state
->symbols
->add_default_precision_qualifier(this->type_name
,
7189 this->default_precision
);
7192 /* FINISHME: Translate precision statements into IR. */
7196 /* _mesa_ast_set_aggregate_type() sets the <structure> field so that
7197 * process_record_constructor() can do type-checking on C-style initializer
7198 * expressions of structs, but ast_struct_specifier should only be translated
7199 * to HIR if it is declaring the type of a structure.
7201 * The ->is_declaration field is false for initializers of variables
7202 * declared separately from the struct's type definition.
7204 * struct S { ... }; (is_declaration = true)
7205 * struct T { ... } t = { ... }; (is_declaration = true)
7206 * S s = { ... }; (is_declaration = false)
7208 if (this->structure
!= NULL
&& this->structure
->is_declaration
)
7209 return this->structure
->hir(instructions
, state
);
7216 * Process a structure or interface block tree into an array of structure fields
7218 * After parsing, where there are some syntax differnces, structures and
7219 * interface blocks are almost identical. They are similar enough that the
7220 * AST for each can be processed the same way into a set of
7221 * \c glsl_struct_field to describe the members.
7223 * If we're processing an interface block, var_mode should be the type of the
7224 * interface block (ir_var_shader_in, ir_var_shader_out, ir_var_uniform or
7225 * ir_var_shader_storage). If we're processing a structure, var_mode should be
7229 * The number of fields processed. A pointer to the array structure fields is
7230 * stored in \c *fields_ret.
7233 ast_process_struct_or_iface_block_members(exec_list
*instructions
,
7234 struct _mesa_glsl_parse_state
*state
,
7235 exec_list
*declarations
,
7236 glsl_struct_field
**fields_ret
,
7238 enum glsl_matrix_layout matrix_layout
,
7239 bool allow_reserved_names
,
7240 ir_variable_mode var_mode
,
7241 ast_type_qualifier
*layout
,
7242 unsigned block_stream
,
7243 unsigned block_xfb_buffer
,
7244 unsigned block_xfb_offset
,
7245 unsigned expl_location
,
7246 unsigned expl_align
)
7248 unsigned decl_count
= 0;
7249 unsigned next_offset
= 0;
7251 /* Make an initial pass over the list of fields to determine how
7252 * many there are. Each element in this list is an ast_declarator_list.
7253 * This means that we actually need to count the number of elements in the
7254 * 'declarations' list in each of the elements.
7256 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
7257 decl_count
+= decl_list
->declarations
.length();
7260 /* Allocate storage for the fields and process the field
7261 * declarations. As the declarations are processed, try to also convert
7262 * the types to HIR. This ensures that structure definitions embedded in
7263 * other structure definitions or in interface blocks are processed.
7265 glsl_struct_field
*const fields
= rzalloc_array(state
, glsl_struct_field
,
7268 bool first_member
= true;
7269 bool first_member_has_explicit_location
= false;
7272 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
7273 const char *type_name
;
7274 YYLTYPE loc
= decl_list
->get_location();
7276 decl_list
->type
->specifier
->hir(instructions
, state
);
7278 /* Section 4.1.8 (Structures) of the GLSL 1.10 spec says:
7280 * "Anonymous structures are not supported; so embedded structures
7281 * must have a declarator. A name given to an embedded struct is
7282 * scoped at the same level as the struct it is embedded in."
7284 * The same section of the GLSL 1.20 spec says:
7286 * "Anonymous structures are not supported. Embedded structures are
7289 * The GLSL ES 1.00 and 3.00 specs have similar langauge. So, we allow
7290 * embedded structures in 1.10 only.
7292 if (state
->language_version
!= 110 &&
7293 decl_list
->type
->specifier
->structure
!= NULL
)
7294 _mesa_glsl_error(&loc
, state
,
7295 "embedded structure declarations are not allowed");
7297 const glsl_type
*decl_type
=
7298 decl_list
->type
->glsl_type(& type_name
, state
);
7300 const struct ast_type_qualifier
*const qual
=
7301 &decl_list
->type
->qualifier
;
7303 /* From section 4.3.9 of the GLSL 4.40 spec:
7305 * "[In interface blocks] opaque types are not allowed."
7307 * It should be impossible for decl_type to be NULL here. Cases that
7308 * might naturally lead to decl_type being NULL, especially for the
7309 * is_interface case, will have resulted in compilation having
7310 * already halted due to a syntax error.
7315 /* From section 4.3.7 of the ARB_bindless_texture spec:
7317 * "(remove the following bullet from the last list on p. 39,
7318 * thereby permitting sampler types in interface blocks; image
7319 * types are also permitted in blocks by this extension)"
7321 * * sampler types are not allowed
7323 if (decl_type
->contains_atomic() ||
7324 (!state
->has_bindless() && decl_type
->contains_opaque())) {
7325 _mesa_glsl_error(&loc
, state
, "uniform/buffer in non-default "
7326 "interface block contains %s variable",
7327 state
->has_bindless() ? "atomic" : "opaque");
7330 if (decl_type
->contains_atomic()) {
7331 /* From section 4.1.7.3 of the GLSL 4.40 spec:
7333 * "Members of structures cannot be declared as atomic counter
7336 _mesa_glsl_error(&loc
, state
, "atomic counter in structure");
7339 if (!state
->has_bindless() && decl_type
->contains_image()) {
7340 /* FINISHME: Same problem as with atomic counters.
7341 * FINISHME: Request clarification from Khronos and add
7342 * FINISHME: spec quotation here.
7344 _mesa_glsl_error(&loc
, state
, "image in structure");
7348 if (qual
->flags
.q
.explicit_binding
) {
7349 _mesa_glsl_error(&loc
, state
,
7350 "binding layout qualifier cannot be applied "
7351 "to struct or interface block members");
7355 if (!first_member
) {
7356 if (!layout
->flags
.q
.explicit_location
&&
7357 ((first_member_has_explicit_location
&&
7358 !qual
->flags
.q
.explicit_location
) ||
7359 (!first_member_has_explicit_location
&&
7360 qual
->flags
.q
.explicit_location
))) {
7361 _mesa_glsl_error(&loc
, state
,
7362 "when block-level location layout qualifier "
7363 "is not supplied either all members must "
7364 "have a location layout qualifier or all "
7365 "members must not have a location layout "
7369 first_member
= false;
7370 first_member_has_explicit_location
=
7371 qual
->flags
.q
.explicit_location
;
7375 if (qual
->flags
.q
.std140
||
7376 qual
->flags
.q
.std430
||
7377 qual
->flags
.q
.packed
||
7378 qual
->flags
.q
.shared
) {
7379 _mesa_glsl_error(&loc
, state
,
7380 "uniform/shader storage block layout qualifiers "
7381 "std140, std430, packed, and shared can only be "
7382 "applied to uniform/shader storage blocks, not "
7386 if (qual
->flags
.q
.constant
) {
7387 _mesa_glsl_error(&loc
, state
,
7388 "const storage qualifier cannot be applied "
7389 "to struct or interface block members");
7392 validate_memory_qualifier_for_type(state
, &loc
, qual
, decl_type
);
7393 validate_image_format_qualifier_for_type(state
, &loc
, qual
, decl_type
);
7395 /* From Section 4.4.2.3 (Geometry Outputs) of the GLSL 4.50 spec:
7397 * "A block member may be declared with a stream identifier, but
7398 * the specified stream must match the stream associated with the
7399 * containing block."
7401 if (qual
->flags
.q
.explicit_stream
) {
7402 unsigned qual_stream
;
7403 if (process_qualifier_constant(state
, &loc
, "stream",
7404 qual
->stream
, &qual_stream
) &&
7405 qual_stream
!= block_stream
) {
7406 _mesa_glsl_error(&loc
, state
, "stream layout qualifier on "
7407 "interface block member does not match "
7408 "the interface block (%u vs %u)", qual_stream
,
7414 unsigned explicit_xfb_buffer
= 0;
7415 if (qual
->flags
.q
.explicit_xfb_buffer
) {
7416 unsigned qual_xfb_buffer
;
7417 if (process_qualifier_constant(state
, &loc
, "xfb_buffer",
7418 qual
->xfb_buffer
, &qual_xfb_buffer
)) {
7419 explicit_xfb_buffer
= 1;
7420 if (qual_xfb_buffer
!= block_xfb_buffer
)
7421 _mesa_glsl_error(&loc
, state
, "xfb_buffer layout qualifier on "
7422 "interface block member does not match "
7423 "the interface block (%u vs %u)",
7424 qual_xfb_buffer
, block_xfb_buffer
);
7426 xfb_buffer
= (int) qual_xfb_buffer
;
7429 explicit_xfb_buffer
= layout
->flags
.q
.explicit_xfb_buffer
;
7430 xfb_buffer
= (int) block_xfb_buffer
;
7433 int xfb_stride
= -1;
7434 if (qual
->flags
.q
.explicit_xfb_stride
) {
7435 unsigned qual_xfb_stride
;
7436 if (process_qualifier_constant(state
, &loc
, "xfb_stride",
7437 qual
->xfb_stride
, &qual_xfb_stride
)) {
7438 xfb_stride
= (int) qual_xfb_stride
;
7442 if (qual
->flags
.q
.uniform
&& qual
->has_interpolation()) {
7443 _mesa_glsl_error(&loc
, state
,
7444 "interpolation qualifiers cannot be used "
7445 "with uniform interface blocks");
7448 if ((qual
->flags
.q
.uniform
|| !is_interface
) &&
7449 qual
->has_auxiliary_storage()) {
7450 _mesa_glsl_error(&loc
, state
,
7451 "auxiliary storage qualifiers cannot be used "
7452 "in uniform blocks or structures.");
7455 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
7456 if (!qual
->flags
.q
.uniform
&& !qual
->flags
.q
.buffer
) {
7457 _mesa_glsl_error(&loc
, state
,
7458 "row_major and column_major can only be "
7459 "applied to interface blocks");
7461 validate_matrix_layout_for_type(state
, &loc
, decl_type
, NULL
);
7464 foreach_list_typed (ast_declaration
, decl
, link
,
7465 &decl_list
->declarations
) {
7466 YYLTYPE loc
= decl
->get_location();
7468 if (!allow_reserved_names
)
7469 validate_identifier(decl
->identifier
, loc
, state
);
7471 const struct glsl_type
*field_type
=
7472 process_array_type(&loc
, decl_type
, decl
->array_specifier
, state
);
7473 validate_array_dimensions(field_type
, state
, &loc
);
7474 fields
[i
].type
= field_type
;
7475 fields
[i
].name
= decl
->identifier
;
7476 fields
[i
].interpolation
=
7477 interpret_interpolation_qualifier(qual
, field_type
,
7478 var_mode
, state
, &loc
);
7479 fields
[i
].centroid
= qual
->flags
.q
.centroid
? 1 : 0;
7480 fields
[i
].sample
= qual
->flags
.q
.sample
? 1 : 0;
7481 fields
[i
].patch
= qual
->flags
.q
.patch
? 1 : 0;
7482 fields
[i
].offset
= -1;
7483 fields
[i
].explicit_xfb_buffer
= explicit_xfb_buffer
;
7484 fields
[i
].xfb_buffer
= xfb_buffer
;
7485 fields
[i
].xfb_stride
= xfb_stride
;
7487 if (qual
->flags
.q
.explicit_location
) {
7488 unsigned qual_location
;
7489 if (process_qualifier_constant(state
, &loc
, "location",
7490 qual
->location
, &qual_location
)) {
7491 fields
[i
].location
= qual_location
+
7492 (fields
[i
].patch
? VARYING_SLOT_PATCH0
: VARYING_SLOT_VAR0
);
7493 expl_location
= fields
[i
].location
+
7494 fields
[i
].type
->count_attribute_slots(false);
7497 if (layout
&& layout
->flags
.q
.explicit_location
) {
7498 fields
[i
].location
= expl_location
;
7499 expl_location
+= fields
[i
].type
->count_attribute_slots(false);
7501 fields
[i
].location
= -1;
7505 /* Offset can only be used with std430 and std140 layouts an initial
7506 * value of 0 is used for error detection.
7512 if (qual
->flags
.q
.row_major
||
7513 matrix_layout
== GLSL_MATRIX_LAYOUT_ROW_MAJOR
) {
7519 if(layout
->flags
.q
.std140
) {
7520 align
= field_type
->std140_base_alignment(row_major
);
7521 size
= field_type
->std140_size(row_major
);
7522 } else if (layout
->flags
.q
.std430
) {
7523 align
= field_type
->std430_base_alignment(row_major
);
7524 size
= field_type
->std430_size(row_major
);
7528 if (qual
->flags
.q
.explicit_offset
) {
7529 unsigned qual_offset
;
7530 if (process_qualifier_constant(state
, &loc
, "offset",
7531 qual
->offset
, &qual_offset
)) {
7532 if (align
!= 0 && size
!= 0) {
7533 if (next_offset
> qual_offset
)
7534 _mesa_glsl_error(&loc
, state
, "layout qualifier "
7535 "offset overlaps previous member");
7537 if (qual_offset
% align
) {
7538 _mesa_glsl_error(&loc
, state
, "layout qualifier offset "
7539 "must be a multiple of the base "
7540 "alignment of %s", field_type
->name
);
7542 fields
[i
].offset
= qual_offset
;
7543 next_offset
= qual_offset
+ size
;
7545 _mesa_glsl_error(&loc
, state
, "offset can only be used "
7546 "with std430 and std140 layouts");
7551 if (qual
->flags
.q
.explicit_align
|| expl_align
!= 0) {
7552 unsigned offset
= fields
[i
].offset
!= -1 ? fields
[i
].offset
:
7554 if (align
== 0 || size
== 0) {
7555 _mesa_glsl_error(&loc
, state
, "align can only be used with "
7556 "std430 and std140 layouts");
7557 } else if (qual
->flags
.q
.explicit_align
) {
7558 unsigned member_align
;
7559 if (process_qualifier_constant(state
, &loc
, "align",
7560 qual
->align
, &member_align
)) {
7561 if (member_align
== 0 ||
7562 member_align
& (member_align
- 1)) {
7563 _mesa_glsl_error(&loc
, state
, "align layout qualifier "
7564 "is not a power of 2");
7566 fields
[i
].offset
= glsl_align(offset
, member_align
);
7567 next_offset
= fields
[i
].offset
+ size
;
7571 fields
[i
].offset
= glsl_align(offset
, expl_align
);
7572 next_offset
= fields
[i
].offset
+ size
;
7574 } else if (!qual
->flags
.q
.explicit_offset
) {
7575 if (align
!= 0 && size
!= 0)
7576 next_offset
= glsl_align(next_offset
, align
) + size
;
7579 /* From the ARB_enhanced_layouts spec:
7581 * "The given offset applies to the first component of the first
7582 * member of the qualified entity. Then, within the qualified
7583 * entity, subsequent components are each assigned, in order, to
7584 * the next available offset aligned to a multiple of that
7585 * component's size. Aggregate types are flattened down to the
7586 * component level to get this sequence of components."
7588 if (qual
->flags
.q
.explicit_xfb_offset
) {
7589 unsigned xfb_offset
;
7590 if (process_qualifier_constant(state
, &loc
, "xfb_offset",
7591 qual
->offset
, &xfb_offset
)) {
7592 fields
[i
].offset
= xfb_offset
;
7593 block_xfb_offset
= fields
[i
].offset
+
7594 4 * field_type
->component_slots();
7597 if (layout
&& layout
->flags
.q
.explicit_xfb_offset
) {
7598 unsigned align
= field_type
->is_64bit() ? 8 : 4;
7599 fields
[i
].offset
= glsl_align(block_xfb_offset
, align
);
7600 block_xfb_offset
+= 4 * field_type
->component_slots();
7604 /* Propogate row- / column-major information down the fields of the
7605 * structure or interface block. Structures need this data because
7606 * the structure may contain a structure that contains ... a matrix
7607 * that need the proper layout.
7609 if (is_interface
&& layout
&&
7610 (layout
->flags
.q
.uniform
|| layout
->flags
.q
.buffer
) &&
7611 (field_type
->without_array()->is_matrix()
7612 || field_type
->without_array()->is_struct())) {
7613 /* If no layout is specified for the field, inherit the layout
7616 fields
[i
].matrix_layout
= matrix_layout
;
7618 if (qual
->flags
.q
.row_major
)
7619 fields
[i
].matrix_layout
= GLSL_MATRIX_LAYOUT_ROW_MAJOR
;
7620 else if (qual
->flags
.q
.column_major
)
7621 fields
[i
].matrix_layout
= GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
;
7623 /* If we're processing an uniform or buffer block, the matrix
7624 * layout must be decided by this point.
7626 assert(fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_ROW_MAJOR
7627 || fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
);
7630 /* Memory qualifiers are allowed on buffer and image variables, while
7631 * the format qualifier is only accepted for images.
7633 if (var_mode
== ir_var_shader_storage
||
7634 field_type
->without_array()->is_image()) {
7635 /* For readonly and writeonly qualifiers the field definition,
7636 * if set, overwrites the layout qualifier.
7638 if (qual
->flags
.q
.read_only
|| qual
->flags
.q
.write_only
) {
7639 fields
[i
].memory_read_only
= qual
->flags
.q
.read_only
;
7640 fields
[i
].memory_write_only
= qual
->flags
.q
.write_only
;
7642 fields
[i
].memory_read_only
=
7643 layout
? layout
->flags
.q
.read_only
: 0;
7644 fields
[i
].memory_write_only
=
7645 layout
? layout
->flags
.q
.write_only
: 0;
7648 /* For other qualifiers, we set the flag if either the layout
7649 * qualifier or the field qualifier are set
7651 fields
[i
].memory_coherent
= qual
->flags
.q
.coherent
||
7652 (layout
&& layout
->flags
.q
.coherent
);
7653 fields
[i
].memory_volatile
= qual
->flags
.q
._volatile
||
7654 (layout
&& layout
->flags
.q
._volatile
);
7655 fields
[i
].memory_restrict
= qual
->flags
.q
.restrict_flag
||
7656 (layout
&& layout
->flags
.q
.restrict_flag
);
7658 if (field_type
->without_array()->is_image()) {
7659 if (qual
->flags
.q
.explicit_image_format
) {
7660 if (qual
->image_base_type
!=
7661 field_type
->without_array()->sampled_type
) {
7662 _mesa_glsl_error(&loc
, state
, "format qualifier doesn't "
7663 "match the base data type of the image");
7666 fields
[i
].image_format
= qual
->image_format
;
7668 if (!qual
->flags
.q
.write_only
) {
7669 _mesa_glsl_error(&loc
, state
, "image not qualified with "
7670 "`writeonly' must have a format layout "
7674 fields
[i
].image_format
= PIPE_FORMAT_NONE
;
7679 /* Precision qualifiers do not hold any meaning in Desktop GLSL */
7680 if (state
->es_shader
) {
7681 fields
[i
].precision
= select_gles_precision(qual
->precision
,
7686 fields
[i
].precision
= qual
->precision
;
7693 assert(i
== decl_count
);
7695 *fields_ret
= fields
;
7701 ast_struct_specifier::hir(exec_list
*instructions
,
7702 struct _mesa_glsl_parse_state
*state
)
7704 YYLTYPE loc
= this->get_location();
7706 unsigned expl_location
= 0;
7707 if (layout
&& layout
->flags
.q
.explicit_location
) {
7708 if (!process_qualifier_constant(state
, &loc
, "location",
7709 layout
->location
, &expl_location
)) {
7712 expl_location
= VARYING_SLOT_VAR0
+ expl_location
;
7716 glsl_struct_field
*fields
;
7717 unsigned decl_count
=
7718 ast_process_struct_or_iface_block_members(instructions
,
7720 &this->declarations
,
7723 GLSL_MATRIX_LAYOUT_INHERITED
,
7724 false /* allow_reserved_names */,
7727 0, /* for interface only */
7728 0, /* for interface only */
7729 0, /* for interface only */
7731 0 /* for interface only */);
7733 validate_identifier(this->name
, loc
, state
);
7735 type
= glsl_type::get_struct_instance(fields
, decl_count
, this->name
);
7737 if (!type
->is_anonymous() && !state
->symbols
->add_type(name
, type
)) {
7738 const glsl_type
*match
= state
->symbols
->get_type(name
);
7739 /* allow struct matching for desktop GL - older UE4 does this */
7740 if (match
!= NULL
&& state
->is_version(130, 0) && match
->record_compare(type
, true, false))
7741 _mesa_glsl_warning(& loc
, state
, "struct `%s' previously defined", name
);
7743 _mesa_glsl_error(& loc
, state
, "struct `%s' previously defined", name
);
7745 const glsl_type
**s
= reralloc(state
, state
->user_structures
,
7747 state
->num_user_structures
+ 1);
7749 s
[state
->num_user_structures
] = type
;
7750 state
->user_structures
= s
;
7751 state
->num_user_structures
++;
7755 /* Structure type definitions do not have r-values.
7762 * Visitor class which detects whether a given interface block has been used.
7764 class interface_block_usage_visitor
: public ir_hierarchical_visitor
7767 interface_block_usage_visitor(ir_variable_mode mode
, const glsl_type
*block
)
7768 : mode(mode
), block(block
), found(false)
7772 virtual ir_visitor_status
visit(ir_dereference_variable
*ir
)
7774 if (ir
->var
->data
.mode
== mode
&& ir
->var
->get_interface_type() == block
) {
7778 return visit_continue
;
7781 bool usage_found() const
7787 ir_variable_mode mode
;
7788 const glsl_type
*block
;
7793 is_unsized_array_last_element(ir_variable
*v
)
7795 const glsl_type
*interface_type
= v
->get_interface_type();
7796 int length
= interface_type
->length
;
7798 assert(v
->type
->is_unsized_array());
7800 /* Check if it is the last element of the interface */
7801 if (strcmp(interface_type
->fields
.structure
[length
-1].name
, v
->name
) == 0)
7807 apply_memory_qualifiers(ir_variable
*var
, glsl_struct_field field
)
7809 var
->data
.memory_read_only
= field
.memory_read_only
;
7810 var
->data
.memory_write_only
= field
.memory_write_only
;
7811 var
->data
.memory_coherent
= field
.memory_coherent
;
7812 var
->data
.memory_volatile
= field
.memory_volatile
;
7813 var
->data
.memory_restrict
= field
.memory_restrict
;
7817 ast_interface_block::hir(exec_list
*instructions
,
7818 struct _mesa_glsl_parse_state
*state
)
7820 YYLTYPE loc
= this->get_location();
7822 /* Interface blocks must be declared at global scope */
7823 if (state
->current_function
!= NULL
) {
7824 _mesa_glsl_error(&loc
, state
,
7825 "Interface block `%s' must be declared "
7830 /* Validate qualifiers:
7832 * - Layout Qualifiers as per the table in Section 4.4
7833 * ("Layout Qualifiers") of the GLSL 4.50 spec.
7835 * - Memory Qualifiers as per Section 4.10 ("Memory Qualifiers") of the
7838 * "Additionally, memory qualifiers may also be used in the declaration
7839 * of shader storage blocks"
7841 * Note the table in Section 4.4 says std430 is allowed on both uniform and
7842 * buffer blocks however Section 4.4.5 (Uniform and Shader Storage Block
7843 * Layout Qualifiers) of the GLSL 4.50 spec says:
7845 * "The std430 qualifier is supported only for shader storage blocks;
7846 * using std430 on a uniform block will result in a compile-time error."
7848 ast_type_qualifier allowed_blk_qualifiers
;
7849 allowed_blk_qualifiers
.flags
.i
= 0;
7850 if (this->layout
.flags
.q
.buffer
|| this->layout
.flags
.q
.uniform
) {
7851 allowed_blk_qualifiers
.flags
.q
.shared
= 1;
7852 allowed_blk_qualifiers
.flags
.q
.packed
= 1;
7853 allowed_blk_qualifiers
.flags
.q
.std140
= 1;
7854 allowed_blk_qualifiers
.flags
.q
.row_major
= 1;
7855 allowed_blk_qualifiers
.flags
.q
.column_major
= 1;
7856 allowed_blk_qualifiers
.flags
.q
.explicit_align
= 1;
7857 allowed_blk_qualifiers
.flags
.q
.explicit_binding
= 1;
7858 if (this->layout
.flags
.q
.buffer
) {
7859 allowed_blk_qualifiers
.flags
.q
.buffer
= 1;
7860 allowed_blk_qualifiers
.flags
.q
.std430
= 1;
7861 allowed_blk_qualifiers
.flags
.q
.coherent
= 1;
7862 allowed_blk_qualifiers
.flags
.q
._volatile
= 1;
7863 allowed_blk_qualifiers
.flags
.q
.restrict_flag
= 1;
7864 allowed_blk_qualifiers
.flags
.q
.read_only
= 1;
7865 allowed_blk_qualifiers
.flags
.q
.write_only
= 1;
7867 allowed_blk_qualifiers
.flags
.q
.uniform
= 1;
7870 /* Interface block */
7871 assert(this->layout
.flags
.q
.in
|| this->layout
.flags
.q
.out
);
7873 allowed_blk_qualifiers
.flags
.q
.explicit_location
= 1;
7874 if (this->layout
.flags
.q
.out
) {
7875 allowed_blk_qualifiers
.flags
.q
.out
= 1;
7876 if (state
->stage
== MESA_SHADER_GEOMETRY
||
7877 state
->stage
== MESA_SHADER_TESS_CTRL
||
7878 state
->stage
== MESA_SHADER_TESS_EVAL
||
7879 state
->stage
== MESA_SHADER_VERTEX
) {
7880 allowed_blk_qualifiers
.flags
.q
.explicit_xfb_offset
= 1;
7881 allowed_blk_qualifiers
.flags
.q
.explicit_xfb_buffer
= 1;
7882 allowed_blk_qualifiers
.flags
.q
.xfb_buffer
= 1;
7883 allowed_blk_qualifiers
.flags
.q
.explicit_xfb_stride
= 1;
7884 allowed_blk_qualifiers
.flags
.q
.xfb_stride
= 1;
7885 if (state
->stage
== MESA_SHADER_GEOMETRY
) {
7886 allowed_blk_qualifiers
.flags
.q
.stream
= 1;
7887 allowed_blk_qualifiers
.flags
.q
.explicit_stream
= 1;
7889 if (state
->stage
== MESA_SHADER_TESS_CTRL
) {
7890 allowed_blk_qualifiers
.flags
.q
.patch
= 1;
7894 allowed_blk_qualifiers
.flags
.q
.in
= 1;
7895 if (state
->stage
== MESA_SHADER_TESS_EVAL
) {
7896 allowed_blk_qualifiers
.flags
.q
.patch
= 1;
7901 this->layout
.validate_flags(&loc
, state
, allowed_blk_qualifiers
,
7902 "invalid qualifier for block",
7905 enum glsl_interface_packing packing
;
7906 if (this->layout
.flags
.q
.std140
) {
7907 packing
= GLSL_INTERFACE_PACKING_STD140
;
7908 } else if (this->layout
.flags
.q
.packed
) {
7909 packing
= GLSL_INTERFACE_PACKING_PACKED
;
7910 } else if (this->layout
.flags
.q
.std430
) {
7911 packing
= GLSL_INTERFACE_PACKING_STD430
;
7913 /* The default layout is shared.
7915 packing
= GLSL_INTERFACE_PACKING_SHARED
;
7918 ir_variable_mode var_mode
;
7919 const char *iface_type_name
;
7920 if (this->layout
.flags
.q
.in
) {
7921 var_mode
= ir_var_shader_in
;
7922 iface_type_name
= "in";
7923 } else if (this->layout
.flags
.q
.out
) {
7924 var_mode
= ir_var_shader_out
;
7925 iface_type_name
= "out";
7926 } else if (this->layout
.flags
.q
.uniform
) {
7927 var_mode
= ir_var_uniform
;
7928 iface_type_name
= "uniform";
7929 } else if (this->layout
.flags
.q
.buffer
) {
7930 var_mode
= ir_var_shader_storage
;
7931 iface_type_name
= "buffer";
7933 var_mode
= ir_var_auto
;
7934 iface_type_name
= "UNKNOWN";
7935 assert(!"interface block layout qualifier not found!");
7938 enum glsl_matrix_layout matrix_layout
= GLSL_MATRIX_LAYOUT_INHERITED
;
7939 if (this->layout
.flags
.q
.row_major
)
7940 matrix_layout
= GLSL_MATRIX_LAYOUT_ROW_MAJOR
;
7941 else if (this->layout
.flags
.q
.column_major
)
7942 matrix_layout
= GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
;
7944 bool redeclaring_per_vertex
= strcmp(this->block_name
, "gl_PerVertex") == 0;
7945 exec_list declared_variables
;
7946 glsl_struct_field
*fields
;
7948 /* For blocks that accept memory qualifiers (i.e. shader storage), verify
7949 * that we don't have incompatible qualifiers
7951 if (this->layout
.flags
.q
.read_only
&& this->layout
.flags
.q
.write_only
) {
7952 _mesa_glsl_error(&loc
, state
,
7953 "Interface block sets both readonly and writeonly");
7956 unsigned qual_stream
;
7957 if (!process_qualifier_constant(state
, &loc
, "stream", this->layout
.stream
,
7959 !validate_stream_qualifier(&loc
, state
, qual_stream
)) {
7960 /* If the stream qualifier is invalid it doesn't make sense to continue
7961 * on and try to compare stream layouts on member variables against it
7962 * so just return early.
7967 unsigned qual_xfb_buffer
;
7968 if (!process_qualifier_constant(state
, &loc
, "xfb_buffer",
7969 layout
.xfb_buffer
, &qual_xfb_buffer
) ||
7970 !validate_xfb_buffer_qualifier(&loc
, state
, qual_xfb_buffer
)) {
7974 unsigned qual_xfb_offset
;
7975 if (layout
.flags
.q
.explicit_xfb_offset
) {
7976 if (!process_qualifier_constant(state
, &loc
, "xfb_offset",
7977 layout
.offset
, &qual_xfb_offset
)) {
7982 unsigned qual_xfb_stride
;
7983 if (layout
.flags
.q
.explicit_xfb_stride
) {
7984 if (!process_qualifier_constant(state
, &loc
, "xfb_stride",
7985 layout
.xfb_stride
, &qual_xfb_stride
)) {
7990 unsigned expl_location
= 0;
7991 if (layout
.flags
.q
.explicit_location
) {
7992 if (!process_qualifier_constant(state
, &loc
, "location",
7993 layout
.location
, &expl_location
)) {
7996 expl_location
+= this->layout
.flags
.q
.patch
? VARYING_SLOT_PATCH0
7997 : VARYING_SLOT_VAR0
;
8001 unsigned expl_align
= 0;
8002 if (layout
.flags
.q
.explicit_align
) {
8003 if (!process_qualifier_constant(state
, &loc
, "align",
8004 layout
.align
, &expl_align
)) {
8007 if (expl_align
== 0 || expl_align
& (expl_align
- 1)) {
8008 _mesa_glsl_error(&loc
, state
, "align layout qualifier is not a "
8015 unsigned int num_variables
=
8016 ast_process_struct_or_iface_block_members(&declared_variables
,
8018 &this->declarations
,
8022 redeclaring_per_vertex
,
8031 if (!redeclaring_per_vertex
) {
8032 validate_identifier(this->block_name
, loc
, state
);
8034 /* From section 4.3.9 ("Interface Blocks") of the GLSL 4.50 spec:
8036 * "Block names have no other use within a shader beyond interface
8037 * matching; it is a compile-time error to use a block name at global
8038 * scope for anything other than as a block name."
8040 ir_variable
*var
= state
->symbols
->get_variable(this->block_name
);
8041 if (var
&& !var
->type
->is_interface()) {
8042 _mesa_glsl_error(&loc
, state
, "Block name `%s' is "
8043 "already used in the scope.",
8048 const glsl_type
*earlier_per_vertex
= NULL
;
8049 if (redeclaring_per_vertex
) {
8050 /* Find the previous declaration of gl_PerVertex. If we're redeclaring
8051 * the named interface block gl_in, we can find it by looking at the
8052 * previous declaration of gl_in. Otherwise we can find it by looking
8053 * at the previous decalartion of any of the built-in outputs,
8056 * Also check that the instance name and array-ness of the redeclaration
8060 case ir_var_shader_in
:
8061 if (ir_variable
*earlier_gl_in
=
8062 state
->symbols
->get_variable("gl_in")) {
8063 earlier_per_vertex
= earlier_gl_in
->get_interface_type();
8065 _mesa_glsl_error(&loc
, state
,
8066 "redeclaration of gl_PerVertex input not allowed "
8068 _mesa_shader_stage_to_string(state
->stage
));
8070 if (this->instance_name
== NULL
||
8071 strcmp(this->instance_name
, "gl_in") != 0 || this->array_specifier
== NULL
||
8072 !this->array_specifier
->is_single_dimension()) {
8073 _mesa_glsl_error(&loc
, state
,
8074 "gl_PerVertex input must be redeclared as "
8078 case ir_var_shader_out
:
8079 if (ir_variable
*earlier_gl_Position
=
8080 state
->symbols
->get_variable("gl_Position")) {
8081 earlier_per_vertex
= earlier_gl_Position
->get_interface_type();
8082 } else if (ir_variable
*earlier_gl_out
=
8083 state
->symbols
->get_variable("gl_out")) {
8084 earlier_per_vertex
= earlier_gl_out
->get_interface_type();
8086 _mesa_glsl_error(&loc
, state
,
8087 "redeclaration of gl_PerVertex output not "
8088 "allowed in the %s shader",
8089 _mesa_shader_stage_to_string(state
->stage
));
8091 if (state
->stage
== MESA_SHADER_TESS_CTRL
) {
8092 if (this->instance_name
== NULL
||
8093 strcmp(this->instance_name
, "gl_out") != 0 || this->array_specifier
== NULL
) {
8094 _mesa_glsl_error(&loc
, state
,
8095 "gl_PerVertex output must be redeclared as "
8099 if (this->instance_name
!= NULL
) {
8100 _mesa_glsl_error(&loc
, state
,
8101 "gl_PerVertex output may not be redeclared with "
8102 "an instance name");
8107 _mesa_glsl_error(&loc
, state
,
8108 "gl_PerVertex must be declared as an input or an "
8113 if (earlier_per_vertex
== NULL
) {
8114 /* An error has already been reported. Bail out to avoid null
8115 * dereferences later in this function.
8120 /* Copy locations from the old gl_PerVertex interface block. */
8121 for (unsigned i
= 0; i
< num_variables
; i
++) {
8122 int j
= earlier_per_vertex
->field_index(fields
[i
].name
);
8124 _mesa_glsl_error(&loc
, state
,
8125 "redeclaration of gl_PerVertex must be a subset "
8126 "of the built-in members of gl_PerVertex");
8128 fields
[i
].location
=
8129 earlier_per_vertex
->fields
.structure
[j
].location
;
8131 earlier_per_vertex
->fields
.structure
[j
].offset
;
8132 fields
[i
].interpolation
=
8133 earlier_per_vertex
->fields
.structure
[j
].interpolation
;
8134 fields
[i
].centroid
=
8135 earlier_per_vertex
->fields
.structure
[j
].centroid
;
8137 earlier_per_vertex
->fields
.structure
[j
].sample
;
8139 earlier_per_vertex
->fields
.structure
[j
].patch
;
8140 fields
[i
].precision
=
8141 earlier_per_vertex
->fields
.structure
[j
].precision
;
8142 fields
[i
].explicit_xfb_buffer
=
8143 earlier_per_vertex
->fields
.structure
[j
].explicit_xfb_buffer
;
8144 fields
[i
].xfb_buffer
=
8145 earlier_per_vertex
->fields
.structure
[j
].xfb_buffer
;
8146 fields
[i
].xfb_stride
=
8147 earlier_per_vertex
->fields
.structure
[j
].xfb_stride
;
8151 /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10
8154 * If a built-in interface block is redeclared, it must appear in
8155 * the shader before any use of any member included in the built-in
8156 * declaration, or a compilation error will result.
8158 * This appears to be a clarification to the behaviour established for
8159 * gl_PerVertex by GLSL 1.50, therefore we implement this behaviour
8160 * regardless of GLSL version.
8162 interface_block_usage_visitor
v(var_mode
, earlier_per_vertex
);
8163 v
.run(instructions
);
8164 if (v
.usage_found()) {
8165 _mesa_glsl_error(&loc
, state
,
8166 "redeclaration of a built-in interface block must "
8167 "appear before any use of any member of the "
8172 const glsl_type
*block_type
=
8173 glsl_type::get_interface_instance(fields
,
8177 GLSL_MATRIX_LAYOUT_ROW_MAJOR
,
8180 unsigned component_size
= block_type
->contains_double() ? 8 : 4;
8182 layout
.flags
.q
.explicit_xfb_offset
? (int) qual_xfb_offset
: -1;
8183 validate_xfb_offset_qualifier(&loc
, state
, xfb_offset
, block_type
,
8186 if (!state
->symbols
->add_interface(block_type
->name
, block_type
, var_mode
)) {
8187 YYLTYPE loc
= this->get_location();
8188 _mesa_glsl_error(&loc
, state
, "interface block `%s' with type `%s' "
8189 "already taken in the current scope",
8190 this->block_name
, iface_type_name
);
8193 /* Since interface blocks cannot contain statements, it should be
8194 * impossible for the block to generate any instructions.
8196 assert(declared_variables
.is_empty());
8198 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
8200 * Geometry shader input variables get the per-vertex values written
8201 * out by vertex shader output variables of the same names. Since a
8202 * geometry shader operates on a set of vertices, each input varying
8203 * variable (or input block, see interface blocks below) needs to be
8204 * declared as an array.
8206 if (state
->stage
== MESA_SHADER_GEOMETRY
&& this->array_specifier
== NULL
&&
8207 var_mode
== ir_var_shader_in
) {
8208 _mesa_glsl_error(&loc
, state
, "geometry shader inputs must be arrays");
8209 } else if ((state
->stage
== MESA_SHADER_TESS_CTRL
||
8210 state
->stage
== MESA_SHADER_TESS_EVAL
) &&
8211 !this->layout
.flags
.q
.patch
&&
8212 this->array_specifier
== NULL
&&
8213 var_mode
== ir_var_shader_in
) {
8214 _mesa_glsl_error(&loc
, state
, "per-vertex tessellation shader inputs must be arrays");
8215 } else if (state
->stage
== MESA_SHADER_TESS_CTRL
&&
8216 !this->layout
.flags
.q
.patch
&&
8217 this->array_specifier
== NULL
&&
8218 var_mode
== ir_var_shader_out
) {
8219 _mesa_glsl_error(&loc
, state
, "tessellation control shader outputs must be arrays");
8223 /* Page 39 (page 45 of the PDF) of section 4.3.7 in the GLSL ES 3.00 spec
8226 * "If an instance name (instance-name) is used, then it puts all the
8227 * members inside a scope within its own name space, accessed with the
8228 * field selector ( . ) operator (analogously to structures)."
8230 if (this->instance_name
) {
8231 if (redeclaring_per_vertex
) {
8232 /* When a built-in in an unnamed interface block is redeclared,
8233 * get_variable_being_redeclared() calls
8234 * check_builtin_array_max_size() to make sure that built-in array
8235 * variables aren't redeclared to illegal sizes. But we're looking
8236 * at a redeclaration of a named built-in interface block. So we
8237 * have to manually call check_builtin_array_max_size() for all parts
8238 * of the interface that are arrays.
8240 for (unsigned i
= 0; i
< num_variables
; i
++) {
8241 if (fields
[i
].type
->is_array()) {
8242 const unsigned size
= fields
[i
].type
->array_size();
8243 check_builtin_array_max_size(fields
[i
].name
, size
, loc
, state
);
8247 validate_identifier(this->instance_name
, loc
, state
);
8252 if (this->array_specifier
!= NULL
) {
8253 const glsl_type
*block_array_type
=
8254 process_array_type(&loc
, block_type
, this->array_specifier
, state
);
8256 /* Section 4.3.7 (Interface Blocks) of the GLSL 1.50 spec says:
8258 * For uniform blocks declared an array, each individual array
8259 * element corresponds to a separate buffer object backing one
8260 * instance of the block. As the array size indicates the number
8261 * of buffer objects needed, uniform block array declarations
8262 * must specify an array size.
8264 * And a few paragraphs later:
8266 * Geometry shader input blocks must be declared as arrays and
8267 * follow the array declaration and linking rules for all
8268 * geometry shader inputs. All other input and output block
8269 * arrays must specify an array size.
8271 * The same applies to tessellation shaders.
8273 * The upshot of this is that the only circumstance where an
8274 * interface array size *doesn't* need to be specified is on a
8275 * geometry shader input, tessellation control shader input,
8276 * tessellation control shader output, and tessellation evaluation
8279 if (block_array_type
->is_unsized_array()) {
8280 bool allow_inputs
= state
->stage
== MESA_SHADER_GEOMETRY
||
8281 state
->stage
== MESA_SHADER_TESS_CTRL
||
8282 state
->stage
== MESA_SHADER_TESS_EVAL
;
8283 bool allow_outputs
= state
->stage
== MESA_SHADER_TESS_CTRL
;
8285 if (this->layout
.flags
.q
.in
) {
8287 _mesa_glsl_error(&loc
, state
,
8288 "unsized input block arrays not allowed in "
8290 _mesa_shader_stage_to_string(state
->stage
));
8291 } else if (this->layout
.flags
.q
.out
) {
8293 _mesa_glsl_error(&loc
, state
,
8294 "unsized output block arrays not allowed in "
8296 _mesa_shader_stage_to_string(state
->stage
));
8298 /* by elimination, this is a uniform block array */
8299 _mesa_glsl_error(&loc
, state
,
8300 "unsized uniform block arrays not allowed in "
8302 _mesa_shader_stage_to_string(state
->stage
));
8306 /* From section 4.3.9 (Interface Blocks) of the GLSL ES 3.10 spec:
8308 * * Arrays of arrays of blocks are not allowed
8310 if (state
->es_shader
&& block_array_type
->is_array() &&
8311 block_array_type
->fields
.array
->is_array()) {
8312 _mesa_glsl_error(&loc
, state
,
8313 "arrays of arrays interface blocks are "
8317 var
= new(state
) ir_variable(block_array_type
,
8318 this->instance_name
,
8321 var
= new(state
) ir_variable(block_type
,
8322 this->instance_name
,
8326 var
->data
.matrix_layout
= matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
8327 ? GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
: matrix_layout
;
8329 if (var_mode
== ir_var_shader_in
|| var_mode
== ir_var_uniform
)
8330 var
->data
.read_only
= true;
8332 var
->data
.patch
= this->layout
.flags
.q
.patch
;
8334 if (state
->stage
== MESA_SHADER_GEOMETRY
&& var_mode
== ir_var_shader_in
)
8335 handle_geometry_shader_input_decl(state
, loc
, var
);
8336 else if ((state
->stage
== MESA_SHADER_TESS_CTRL
||
8337 state
->stage
== MESA_SHADER_TESS_EVAL
) && var_mode
== ir_var_shader_in
)
8338 handle_tess_shader_input_decl(state
, loc
, var
);
8339 else if (state
->stage
== MESA_SHADER_TESS_CTRL
&& var_mode
== ir_var_shader_out
)
8340 handle_tess_ctrl_shader_output_decl(state
, loc
, var
);
8342 for (unsigned i
= 0; i
< num_variables
; i
++) {
8343 if (var
->data
.mode
== ir_var_shader_storage
)
8344 apply_memory_qualifiers(var
, fields
[i
]);
8347 if (ir_variable
*earlier
=
8348 state
->symbols
->get_variable(this->instance_name
)) {
8349 if (!redeclaring_per_vertex
) {
8350 _mesa_glsl_error(&loc
, state
, "`%s' redeclared",
8351 this->instance_name
);
8353 earlier
->data
.how_declared
= ir_var_declared_normally
;
8354 earlier
->type
= var
->type
;
8355 earlier
->reinit_interface_type(block_type
);
8358 if (this->layout
.flags
.q
.explicit_binding
) {
8359 apply_explicit_binding(state
, &loc
, var
, var
->type
,
8363 var
->data
.stream
= qual_stream
;
8364 if (layout
.flags
.q
.explicit_location
) {
8365 var
->data
.location
= expl_location
;
8366 var
->data
.explicit_location
= true;
8369 state
->symbols
->add_variable(var
);
8370 instructions
->push_tail(var
);
8373 /* In order to have an array size, the block must also be declared with
8376 assert(this->array_specifier
== NULL
);
8378 for (unsigned i
= 0; i
< num_variables
; i
++) {
8380 new(state
) ir_variable(fields
[i
].type
,
8381 ralloc_strdup(state
, fields
[i
].name
),
8383 var
->data
.interpolation
= fields
[i
].interpolation
;
8384 var
->data
.centroid
= fields
[i
].centroid
;
8385 var
->data
.sample
= fields
[i
].sample
;
8386 var
->data
.patch
= fields
[i
].patch
;
8387 var
->data
.stream
= qual_stream
;
8388 var
->data
.location
= fields
[i
].location
;
8390 if (fields
[i
].location
!= -1)
8391 var
->data
.explicit_location
= true;
8393 var
->data
.explicit_xfb_buffer
= fields
[i
].explicit_xfb_buffer
;
8394 var
->data
.xfb_buffer
= fields
[i
].xfb_buffer
;
8396 if (fields
[i
].offset
!= -1)
8397 var
->data
.explicit_xfb_offset
= true;
8398 var
->data
.offset
= fields
[i
].offset
;
8400 var
->init_interface_type(block_type
);
8402 if (var_mode
== ir_var_shader_in
|| var_mode
== ir_var_uniform
)
8403 var
->data
.read_only
= true;
8405 /* Precision qualifiers do not have any meaning in Desktop GLSL */
8406 if (state
->es_shader
) {
8407 var
->data
.precision
=
8408 select_gles_precision(fields
[i
].precision
, fields
[i
].type
,
8412 if (fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
) {
8413 var
->data
.matrix_layout
= matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
8414 ? GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
: matrix_layout
;
8416 var
->data
.matrix_layout
= fields
[i
].matrix_layout
;
8419 if (var
->data
.mode
== ir_var_shader_storage
)
8420 apply_memory_qualifiers(var
, fields
[i
]);
8422 /* Examine var name here since var may get deleted in the next call */
8423 bool var_is_gl_id
= is_gl_identifier(var
->name
);
8425 if (redeclaring_per_vertex
) {
8426 bool is_redeclaration
;
8428 get_variable_being_redeclared(&var
, loc
, state
,
8429 true /* allow_all_redeclarations */,
8431 if (!var_is_gl_id
|| !is_redeclaration
) {
8432 _mesa_glsl_error(&loc
, state
,
8433 "redeclaration of gl_PerVertex can only "
8434 "include built-in variables");
8435 } else if (var
->data
.how_declared
== ir_var_declared_normally
) {
8436 _mesa_glsl_error(&loc
, state
,
8437 "`%s' has already been redeclared",
8440 var
->data
.how_declared
= ir_var_declared_in_block
;
8441 var
->reinit_interface_type(block_type
);
8446 if (state
->symbols
->get_variable(var
->name
) != NULL
)
8447 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", var
->name
);
8449 /* Propagate the "binding" keyword into this UBO/SSBO's fields.
8450 * The UBO declaration itself doesn't get an ir_variable unless it
8451 * has an instance name. This is ugly.
8453 if (this->layout
.flags
.q
.explicit_binding
) {
8454 apply_explicit_binding(state
, &loc
, var
,
8455 var
->get_interface_type(), &this->layout
);
8458 if (var
->type
->is_unsized_array()) {
8459 if (var
->is_in_shader_storage_block() &&
8460 is_unsized_array_last_element(var
)) {
8461 var
->data
.from_ssbo_unsized_array
= true;
8463 /* From GLSL ES 3.10 spec, section 4.1.9 "Arrays":
8465 * "If an array is declared as the last member of a shader storage
8466 * block and the size is not specified at compile-time, it is
8467 * sized at run-time. In all other cases, arrays are sized only
8470 * In desktop GLSL it is allowed to have unsized-arrays that are
8471 * not last, as long as we can determine that they are implicitly
8474 if (state
->es_shader
) {
8475 _mesa_glsl_error(&loc
, state
, "unsized array `%s' "
8476 "definition: only last member of a shader "
8477 "storage block can be defined as unsized "
8478 "array", fields
[i
].name
);
8483 state
->symbols
->add_variable(var
);
8484 instructions
->push_tail(var
);
8487 if (redeclaring_per_vertex
&& block_type
!= earlier_per_vertex
) {
8488 /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10 spec:
8490 * It is also a compilation error ... to redeclare a built-in
8491 * block and then use a member from that built-in block that was
8492 * not included in the redeclaration.
8494 * This appears to be a clarification to the behaviour established
8495 * for gl_PerVertex by GLSL 1.50, therefore we implement this
8496 * behaviour regardless of GLSL version.
8498 * To prevent the shader from using a member that was not included in
8499 * the redeclaration, we disable any ir_variables that are still
8500 * associated with the old declaration of gl_PerVertex (since we've
8501 * already updated all of the variables contained in the new
8502 * gl_PerVertex to point to it).
8504 * As a side effect this will prevent
8505 * validate_intrastage_interface_blocks() from getting confused and
8506 * thinking there are conflicting definitions of gl_PerVertex in the
8509 foreach_in_list_safe(ir_instruction
, node
, instructions
) {
8510 ir_variable
*const var
= node
->as_variable();
8512 var
->get_interface_type() == earlier_per_vertex
&&
8513 var
->data
.mode
== var_mode
) {
8514 if (var
->data
.how_declared
== ir_var_declared_normally
) {
8515 _mesa_glsl_error(&loc
, state
,
8516 "redeclaration of gl_PerVertex cannot "
8517 "follow a redeclaration of `%s'",
8520 state
->symbols
->disable_variable(var
->name
);
8532 ast_tcs_output_layout::hir(exec_list
*instructions
,
8533 struct _mesa_glsl_parse_state
*state
)
8535 YYLTYPE loc
= this->get_location();
8537 unsigned num_vertices
;
8538 if (!state
->out_qualifier
->vertices
->
8539 process_qualifier_constant(state
, "vertices", &num_vertices
,
8541 /* return here to stop cascading incorrect error messages */
8545 /* If any shader outputs occurred before this declaration and specified an
8546 * array size, make sure the size they specified is consistent with the
8549 if (state
->tcs_output_size
!= 0 && state
->tcs_output_size
!= num_vertices
) {
8550 _mesa_glsl_error(&loc
, state
,
8551 "this tessellation control shader output layout "
8552 "specifies %u vertices, but a previous output "
8553 "is declared with size %u",
8554 num_vertices
, state
->tcs_output_size
);
8558 state
->tcs_output_vertices_specified
= true;
8560 /* If any shader outputs occurred before this declaration and did not
8561 * specify an array size, their size is determined now.
8563 foreach_in_list (ir_instruction
, node
, instructions
) {
8564 ir_variable
*var
= node
->as_variable();
8565 if (var
== NULL
|| var
->data
.mode
!= ir_var_shader_out
)
8568 /* Note: Not all tessellation control shader output are arrays. */
8569 if (!var
->type
->is_unsized_array() || var
->data
.patch
)
8572 if (var
->data
.max_array_access
>= (int)num_vertices
) {
8573 _mesa_glsl_error(&loc
, state
,
8574 "this tessellation control shader output layout "
8575 "specifies %u vertices, but an access to element "
8576 "%u of output `%s' already exists", num_vertices
,
8577 var
->data
.max_array_access
, var
->name
);
8579 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
8589 ast_gs_input_layout::hir(exec_list
*instructions
,
8590 struct _mesa_glsl_parse_state
*state
)
8592 YYLTYPE loc
= this->get_location();
8594 /* Should have been prevented by the parser. */
8595 assert(!state
->gs_input_prim_type_specified
8596 || state
->in_qualifier
->prim_type
== this->prim_type
);
8598 /* If any shader inputs occurred before this declaration and specified an
8599 * array size, make sure the size they specified is consistent with the
8602 unsigned num_vertices
= vertices_per_prim(this->prim_type
);
8603 if (state
->gs_input_size
!= 0 && state
->gs_input_size
!= num_vertices
) {
8604 _mesa_glsl_error(&loc
, state
,
8605 "this geometry shader input layout implies %u vertices"
8606 " per primitive, but a previous input is declared"
8607 " with size %u", num_vertices
, state
->gs_input_size
);
8611 state
->gs_input_prim_type_specified
= true;
8613 /* If any shader inputs occurred before this declaration and did not
8614 * specify an array size, their size is determined now.
8616 foreach_in_list(ir_instruction
, node
, instructions
) {
8617 ir_variable
*var
= node
->as_variable();
8618 if (var
== NULL
|| var
->data
.mode
!= ir_var_shader_in
)
8621 /* Note: gl_PrimitiveIDIn has mode ir_var_shader_in, but it's not an
8625 if (var
->type
->is_unsized_array()) {
8626 if (var
->data
.max_array_access
>= (int)num_vertices
) {
8627 _mesa_glsl_error(&loc
, state
,
8628 "this geometry shader input layout implies %u"
8629 " vertices, but an access to element %u of input"
8630 " `%s' already exists", num_vertices
,
8631 var
->data
.max_array_access
, var
->name
);
8633 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
8644 ast_cs_input_layout::hir(exec_list
*instructions
,
8645 struct _mesa_glsl_parse_state
*state
)
8647 YYLTYPE loc
= this->get_location();
8649 /* From the ARB_compute_shader specification:
8651 * If the local size of the shader in any dimension is greater
8652 * than the maximum size supported by the implementation for that
8653 * dimension, a compile-time error results.
8655 * It is not clear from the spec how the error should be reported if
8656 * the total size of the work group exceeds
8657 * MAX_COMPUTE_WORK_GROUP_INVOCATIONS, but it seems reasonable to
8658 * report it at compile time as well.
8660 GLuint64 total_invocations
= 1;
8661 unsigned qual_local_size
[3];
8662 for (int i
= 0; i
< 3; i
++) {
8664 char *local_size_str
= ralloc_asprintf(NULL
, "invalid local_size_%c",
8666 /* Infer a local_size of 1 for unspecified dimensions */
8667 if (this->local_size
[i
] == NULL
) {
8668 qual_local_size
[i
] = 1;
8669 } else if (!this->local_size
[i
]->
8670 process_qualifier_constant(state
, local_size_str
,
8671 &qual_local_size
[i
], false)) {
8672 ralloc_free(local_size_str
);
8675 ralloc_free(local_size_str
);
8677 if (qual_local_size
[i
] > state
->ctx
->Const
.MaxComputeWorkGroupSize
[i
]) {
8678 _mesa_glsl_error(&loc
, state
,
8679 "local_size_%c exceeds MAX_COMPUTE_WORK_GROUP_SIZE"
8681 state
->ctx
->Const
.MaxComputeWorkGroupSize
[i
]);
8684 total_invocations
*= qual_local_size
[i
];
8685 if (total_invocations
>
8686 state
->ctx
->Const
.MaxComputeWorkGroupInvocations
) {
8687 _mesa_glsl_error(&loc
, state
,
8688 "product of local_sizes exceeds "
8689 "MAX_COMPUTE_WORK_GROUP_INVOCATIONS (%d)",
8690 state
->ctx
->Const
.MaxComputeWorkGroupInvocations
);
8695 /* If any compute input layout declaration preceded this one, make sure it
8696 * was consistent with this one.
8698 if (state
->cs_input_local_size_specified
) {
8699 for (int i
= 0; i
< 3; i
++) {
8700 if (state
->cs_input_local_size
[i
] != qual_local_size
[i
]) {
8701 _mesa_glsl_error(&loc
, state
,
8702 "compute shader input layout does not match"
8703 " previous declaration");
8709 /* The ARB_compute_variable_group_size spec says:
8711 * If a compute shader including a *local_size_variable* qualifier also
8712 * declares a fixed local group size using the *local_size_x*,
8713 * *local_size_y*, or *local_size_z* qualifiers, a compile-time error
8716 if (state
->cs_input_local_size_variable_specified
) {
8717 _mesa_glsl_error(&loc
, state
,
8718 "compute shader can't include both a variable and a "
8719 "fixed local group size");
8723 state
->cs_input_local_size_specified
= true;
8724 for (int i
= 0; i
< 3; i
++)
8725 state
->cs_input_local_size
[i
] = qual_local_size
[i
];
8727 /* We may now declare the built-in constant gl_WorkGroupSize (see
8728 * builtin_variable_generator::generate_constants() for why we didn't
8729 * declare it earlier).
8731 ir_variable
*var
= new(state
->symbols
)
8732 ir_variable(glsl_type::uvec3_type
, "gl_WorkGroupSize", ir_var_auto
);
8733 var
->data
.how_declared
= ir_var_declared_implicitly
;
8734 var
->data
.read_only
= true;
8735 instructions
->push_tail(var
);
8736 state
->symbols
->add_variable(var
);
8737 ir_constant_data data
;
8738 memset(&data
, 0, sizeof(data
));
8739 for (int i
= 0; i
< 3; i
++)
8740 data
.u
[i
] = qual_local_size
[i
];
8741 var
->constant_value
= new(var
) ir_constant(glsl_type::uvec3_type
, &data
);
8742 var
->constant_initializer
=
8743 new(var
) ir_constant(glsl_type::uvec3_type
, &data
);
8744 var
->data
.has_initializer
= true;
8751 detect_conflicting_assignments(struct _mesa_glsl_parse_state
*state
,
8752 exec_list
*instructions
)
8754 bool gl_FragColor_assigned
= false;
8755 bool gl_FragData_assigned
= false;
8756 bool gl_FragSecondaryColor_assigned
= false;
8757 bool gl_FragSecondaryData_assigned
= false;
8758 bool user_defined_fs_output_assigned
= false;
8759 ir_variable
*user_defined_fs_output
= NULL
;
8761 /* It would be nice to have proper location information. */
8763 memset(&loc
, 0, sizeof(loc
));
8765 foreach_in_list(ir_instruction
, node
, instructions
) {
8766 ir_variable
*var
= node
->as_variable();
8768 if (!var
|| !var
->data
.assigned
)
8771 if (strcmp(var
->name
, "gl_FragColor") == 0)
8772 gl_FragColor_assigned
= true;
8773 else if (strcmp(var
->name
, "gl_FragData") == 0)
8774 gl_FragData_assigned
= true;
8775 else if (strcmp(var
->name
, "gl_SecondaryFragColorEXT") == 0)
8776 gl_FragSecondaryColor_assigned
= true;
8777 else if (strcmp(var
->name
, "gl_SecondaryFragDataEXT") == 0)
8778 gl_FragSecondaryData_assigned
= true;
8779 else if (!is_gl_identifier(var
->name
)) {
8780 if (state
->stage
== MESA_SHADER_FRAGMENT
&&
8781 var
->data
.mode
== ir_var_shader_out
) {
8782 user_defined_fs_output_assigned
= true;
8783 user_defined_fs_output
= var
;
8788 /* From the GLSL 1.30 spec:
8790 * "If a shader statically assigns a value to gl_FragColor, it
8791 * may not assign a value to any element of gl_FragData. If a
8792 * shader statically writes a value to any element of
8793 * gl_FragData, it may not assign a value to
8794 * gl_FragColor. That is, a shader may assign values to either
8795 * gl_FragColor or gl_FragData, but not both. Multiple shaders
8796 * linked together must also consistently write just one of
8797 * these variables. Similarly, if user declared output
8798 * variables are in use (statically assigned to), then the
8799 * built-in variables gl_FragColor and gl_FragData may not be
8800 * assigned to. These incorrect usages all generate compile
8803 if (gl_FragColor_assigned
&& gl_FragData_assigned
) {
8804 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8805 "`gl_FragColor' and `gl_FragData'");
8806 } else if (gl_FragColor_assigned
&& user_defined_fs_output_assigned
) {
8807 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8808 "`gl_FragColor' and `%s'",
8809 user_defined_fs_output
->name
);
8810 } else if (gl_FragSecondaryColor_assigned
&& gl_FragSecondaryData_assigned
) {
8811 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8812 "`gl_FragSecondaryColorEXT' and"
8813 " `gl_FragSecondaryDataEXT'");
8814 } else if (gl_FragColor_assigned
&& gl_FragSecondaryData_assigned
) {
8815 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8816 "`gl_FragColor' and"
8817 " `gl_FragSecondaryDataEXT'");
8818 } else if (gl_FragData_assigned
&& gl_FragSecondaryColor_assigned
) {
8819 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8821 " `gl_FragSecondaryColorEXT'");
8822 } else if (gl_FragData_assigned
&& user_defined_fs_output_assigned
) {
8823 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8824 "`gl_FragData' and `%s'",
8825 user_defined_fs_output
->name
);
8828 if ((gl_FragSecondaryColor_assigned
|| gl_FragSecondaryData_assigned
) &&
8829 !state
->EXT_blend_func_extended_enable
) {
8830 _mesa_glsl_error(&loc
, state
,
8831 "Dual source blending requires EXT_blend_func_extended");
8836 verify_subroutine_associated_funcs(struct _mesa_glsl_parse_state
*state
)
8839 memset(&loc
, 0, sizeof(loc
));
8841 /* Section 6.1.2 (Subroutines) of the GLSL 4.00 spec says:
8843 * "A program will fail to compile or link if any shader
8844 * or stage contains two or more functions with the same
8845 * name if the name is associated with a subroutine type."
8848 for (int i
= 0; i
< state
->num_subroutines
; i
++) {
8849 unsigned definitions
= 0;
8850 ir_function
*fn
= state
->subroutines
[i
];
8851 /* Calculate number of function definitions with the same name */
8852 foreach_in_list(ir_function_signature
, sig
, &fn
->signatures
) {
8853 if (sig
->is_defined
) {
8854 if (++definitions
> 1) {
8855 _mesa_glsl_error(&loc
, state
,
8856 "%s shader contains two or more function "
8857 "definitions with name `%s', which is "
8858 "associated with a subroutine type.\n",
8859 _mesa_shader_stage_to_string(state
->stage
),
8869 remove_per_vertex_blocks(exec_list
*instructions
,
8870 _mesa_glsl_parse_state
*state
, ir_variable_mode mode
)
8872 /* Find the gl_PerVertex interface block of the appropriate (in/out) mode,
8873 * if it exists in this shader type.
8875 const glsl_type
*per_vertex
= NULL
;
8877 case ir_var_shader_in
:
8878 if (ir_variable
*gl_in
= state
->symbols
->get_variable("gl_in"))
8879 per_vertex
= gl_in
->get_interface_type();
8881 case ir_var_shader_out
:
8882 if (ir_variable
*gl_Position
=
8883 state
->symbols
->get_variable("gl_Position")) {
8884 per_vertex
= gl_Position
->get_interface_type();
8888 assert(!"Unexpected mode");
8892 /* If we didn't find a built-in gl_PerVertex interface block, then we don't
8893 * need to do anything.
8895 if (per_vertex
== NULL
)
8898 /* If the interface block is used by the shader, then we don't need to do
8901 interface_block_usage_visitor
v(mode
, per_vertex
);
8902 v
.run(instructions
);
8903 if (v
.usage_found())
8906 /* Remove any ir_variable declarations that refer to the interface block
8909 foreach_in_list_safe(ir_instruction
, node
, instructions
) {
8910 ir_variable
*const var
= node
->as_variable();
8911 if (var
!= NULL
&& var
->get_interface_type() == per_vertex
&&
8912 var
->data
.mode
== mode
) {
8913 state
->symbols
->disable_variable(var
->name
);
8920 ast_warnings_toggle::hir(exec_list
*,
8921 struct _mesa_glsl_parse_state
*state
)
8923 state
->warnings_enabled
= enable
;