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 "glsl_types.h"
56 #include "program/hash_table.h"
57 #include "main/shaderobj.h"
59 #include "ir_builder.h"
61 using namespace ir_builder
;
64 detect_conflicting_assignments(struct _mesa_glsl_parse_state
*state
,
65 exec_list
*instructions
);
67 remove_per_vertex_blocks(exec_list
*instructions
,
68 _mesa_glsl_parse_state
*state
, ir_variable_mode mode
);
71 * Visitor class that finds the first instance of any write-only variable that
72 * is ever read, if any
74 class read_from_write_only_variable_visitor
: public ir_hierarchical_visitor
77 read_from_write_only_variable_visitor() : found(NULL
)
81 virtual ir_visitor_status
visit(ir_dereference_variable
*ir
)
83 if (this->in_assignee
)
84 return visit_continue
;
86 ir_variable
*var
= ir
->variable_referenced();
87 /* We can have image_write_only set on both images and buffer variables,
88 * but in the former there is a distinction between reads from
89 * the variable itself (write_only) and from the memory they point to
90 * (image_write_only), while in the case of buffer variables there is
91 * no such distinction, that is why this check here is limited to
92 * buffer variables alone.
94 if (!var
|| var
->data
.mode
!= ir_var_shader_storage
)
95 return visit_continue
;
97 if (var
->data
.image_write_only
) {
102 return visit_continue
;
105 ir_variable
*get_variable() {
114 _mesa_ast_to_hir(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
)
116 _mesa_glsl_initialize_variables(instructions
, state
);
118 state
->symbols
->separate_function_namespace
= state
->language_version
== 110;
120 state
->current_function
= NULL
;
122 state
->toplevel_ir
= instructions
;
124 state
->gs_input_prim_type_specified
= false;
125 state
->tcs_output_vertices_specified
= false;
126 state
->cs_input_local_size_specified
= false;
128 /* Section 4.2 of the GLSL 1.20 specification states:
129 * "The built-in functions are scoped in a scope outside the global scope
130 * users declare global variables in. That is, a shader's global scope,
131 * available for user-defined functions and global variables, is nested
132 * inside the scope containing the built-in functions."
134 * Since built-in functions like ftransform() access built-in variables,
135 * it follows that those must be in the outer scope as well.
137 * We push scope here to create this nesting effect...but don't pop.
138 * This way, a shader's globals are still in the symbol table for use
141 state
->symbols
->push_scope();
143 foreach_list_typed (ast_node
, ast
, link
, & state
->translation_unit
)
144 ast
->hir(instructions
, state
);
146 detect_recursion_unlinked(state
, instructions
);
147 detect_conflicting_assignments(state
, instructions
);
149 state
->toplevel_ir
= NULL
;
151 /* Move all of the variable declarations to the front of the IR list, and
152 * reverse the order. This has the (intended!) side effect that vertex
153 * shader inputs and fragment shader outputs will appear in the IR in the
154 * same order that they appeared in the shader code. This results in the
155 * locations being assigned in the declared order. Many (arguably buggy)
156 * applications depend on this behavior, and it matches what nearly all
159 foreach_in_list_safe(ir_instruction
, node
, instructions
) {
160 ir_variable
*const var
= node
->as_variable();
166 instructions
->push_head(var
);
169 /* Figure out if gl_FragCoord is actually used in fragment shader */
170 ir_variable
*const var
= state
->symbols
->get_variable("gl_FragCoord");
172 state
->fs_uses_gl_fragcoord
= var
->data
.used
;
174 /* From section 7.1 (Built-In Language Variables) of the GLSL 4.10 spec:
176 * If multiple shaders using members of a built-in block belonging to
177 * the same interface are linked together in the same program, they
178 * must all redeclare the built-in block in the same way, as described
179 * in section 4.3.7 "Interface Blocks" for interface block matching, or
180 * a link error will result.
182 * The phrase "using members of a built-in block" implies that if two
183 * shaders are linked together and one of them *does not use* any members
184 * of the built-in block, then that shader does not need to have a matching
185 * redeclaration of the built-in block.
187 * This appears to be a clarification to the behaviour established for
188 * gl_PerVertex by GLSL 1.50, therefore implement it regardless of GLSL
191 * The definition of "interface" in section 4.3.7 that applies here is as
194 * The boundary between adjacent programmable pipeline stages: This
195 * spans all the outputs in all compilation units of the first stage
196 * and all the inputs in all compilation units of the second stage.
198 * Therefore this rule applies to both inter- and intra-stage linking.
200 * The easiest way to implement this is to check whether the shader uses
201 * gl_PerVertex right after ast-to-ir conversion, and if it doesn't, simply
202 * remove all the relevant variable declaration from the IR, so that the
203 * linker won't see them and complain about mismatches.
205 remove_per_vertex_blocks(instructions
, state
, ir_var_shader_in
);
206 remove_per_vertex_blocks(instructions
, state
, ir_var_shader_out
);
208 /* Check that we don't have reads from write-only variables */
209 read_from_write_only_variable_visitor v
;
211 ir_variable
*error_var
= v
.get_variable();
213 /* It would be nice to have proper location information, but for that
214 * we would need to check this as we process each kind of AST node
217 memset(&loc
, 0, sizeof(loc
));
218 _mesa_glsl_error(&loc
, state
, "Read from write-only variable `%s'",
224 static ir_expression_operation
225 get_conversion_operation(const glsl_type
*to
, const glsl_type
*from
,
226 struct _mesa_glsl_parse_state
*state
)
228 switch (to
->base_type
) {
229 case GLSL_TYPE_FLOAT
:
230 switch (from
->base_type
) {
231 case GLSL_TYPE_INT
: return ir_unop_i2f
;
232 case GLSL_TYPE_UINT
: return ir_unop_u2f
;
233 case GLSL_TYPE_DOUBLE
: return ir_unop_d2f
;
234 default: return (ir_expression_operation
)0;
238 if (!state
->is_version(400, 0) && !state
->ARB_gpu_shader5_enable
)
239 return (ir_expression_operation
)0;
240 switch (from
->base_type
) {
241 case GLSL_TYPE_INT
: return ir_unop_i2u
;
242 default: return (ir_expression_operation
)0;
245 case GLSL_TYPE_DOUBLE
:
246 if (!state
->has_double())
247 return (ir_expression_operation
)0;
248 switch (from
->base_type
) {
249 case GLSL_TYPE_INT
: return ir_unop_i2d
;
250 case GLSL_TYPE_UINT
: return ir_unop_u2d
;
251 case GLSL_TYPE_FLOAT
: return ir_unop_f2d
;
252 default: return (ir_expression_operation
)0;
255 default: return (ir_expression_operation
)0;
261 * If a conversion is available, convert one operand to a different type
263 * The \c from \c ir_rvalue is converted "in place".
265 * \param to Type that the operand it to be converted to
266 * \param from Operand that is being converted
267 * \param state GLSL compiler state
270 * If a conversion is possible (or unnecessary), \c true is returned.
271 * Otherwise \c false is returned.
274 apply_implicit_conversion(const glsl_type
*to
, ir_rvalue
* &from
,
275 struct _mesa_glsl_parse_state
*state
)
278 if (to
->base_type
== from
->type
->base_type
)
281 /* Prior to GLSL 1.20, there are no implicit conversions */
282 if (!state
->is_version(120, 0))
285 /* From page 27 (page 33 of the PDF) of the GLSL 1.50 spec:
287 * "There are no implicit array or structure conversions. For
288 * example, an array of int cannot be implicitly converted to an
291 if (!to
->is_numeric() || !from
->type
->is_numeric())
294 /* We don't actually want the specific type `to`, we want a type
295 * with the same base type as `to`, but the same vector width as
298 to
= glsl_type::get_instance(to
->base_type
, from
->type
->vector_elements
,
299 from
->type
->matrix_columns
);
301 ir_expression_operation op
= get_conversion_operation(to
, from
->type
, state
);
303 from
= new(ctx
) ir_expression(op
, to
, from
, NULL
);
311 static const struct glsl_type
*
312 arithmetic_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
314 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
316 const glsl_type
*type_a
= value_a
->type
;
317 const glsl_type
*type_b
= value_b
->type
;
319 /* From GLSL 1.50 spec, page 56:
321 * "The arithmetic binary operators add (+), subtract (-),
322 * multiply (*), and divide (/) operate on integer and
323 * floating-point scalars, vectors, and matrices."
325 if (!type_a
->is_numeric() || !type_b
->is_numeric()) {
326 _mesa_glsl_error(loc
, state
,
327 "operands to arithmetic operators must be numeric");
328 return glsl_type::error_type
;
332 /* "If one operand is floating-point based and the other is
333 * not, then the conversions from Section 4.1.10 "Implicit
334 * Conversions" are applied to the non-floating-point-based operand."
336 if (!apply_implicit_conversion(type_a
, value_b
, state
)
337 && !apply_implicit_conversion(type_b
, value_a
, state
)) {
338 _mesa_glsl_error(loc
, state
,
339 "could not implicitly convert operands to "
340 "arithmetic operator");
341 return glsl_type::error_type
;
343 type_a
= value_a
->type
;
344 type_b
= value_b
->type
;
346 /* "If the operands are integer types, they must both be signed or
349 * From this rule and the preceeding conversion it can be inferred that
350 * both types must be GLSL_TYPE_FLOAT, or GLSL_TYPE_UINT, or GLSL_TYPE_INT.
351 * The is_numeric check above already filtered out the case where either
352 * type is not one of these, so now the base types need only be tested for
355 if (type_a
->base_type
!= type_b
->base_type
) {
356 _mesa_glsl_error(loc
, state
,
357 "base type mismatch for arithmetic operator");
358 return glsl_type::error_type
;
361 /* "All arithmetic binary operators result in the same fundamental type
362 * (signed integer, unsigned integer, or floating-point) as the
363 * operands they operate on, after operand type conversion. After
364 * conversion, the following cases are valid
366 * * The two operands are scalars. In this case the operation is
367 * applied, resulting in a scalar."
369 if (type_a
->is_scalar() && type_b
->is_scalar())
372 /* "* One operand is a scalar, and the other is a vector or matrix.
373 * In this case, the scalar operation is applied independently to each
374 * component of the vector or matrix, resulting in the same size
377 if (type_a
->is_scalar()) {
378 if (!type_b
->is_scalar())
380 } else if (type_b
->is_scalar()) {
384 /* All of the combinations of <scalar, scalar>, <vector, scalar>,
385 * <scalar, vector>, <scalar, matrix>, and <matrix, scalar> have been
388 assert(!type_a
->is_scalar());
389 assert(!type_b
->is_scalar());
391 /* "* The two operands are vectors of the same size. In this case, the
392 * operation is done component-wise resulting in the same size
395 if (type_a
->is_vector() && type_b
->is_vector()) {
396 if (type_a
== type_b
) {
399 _mesa_glsl_error(loc
, state
,
400 "vector size mismatch for arithmetic operator");
401 return glsl_type::error_type
;
405 /* All of the combinations of <scalar, scalar>, <vector, scalar>,
406 * <scalar, vector>, <scalar, matrix>, <matrix, scalar>, and
407 * <vector, vector> have been handled. At least one of the operands must
408 * be matrix. Further, since there are no integer matrix types, the base
409 * type of both operands must be float.
411 assert(type_a
->is_matrix() || type_b
->is_matrix());
412 assert(type_a
->base_type
== GLSL_TYPE_FLOAT
||
413 type_a
->base_type
== GLSL_TYPE_DOUBLE
);
414 assert(type_b
->base_type
== GLSL_TYPE_FLOAT
||
415 type_b
->base_type
== GLSL_TYPE_DOUBLE
);
417 /* "* The operator is add (+), subtract (-), or divide (/), and the
418 * operands are matrices with the same number of rows and the same
419 * number of columns. In this case, the operation is done component-
420 * wise resulting in the same size matrix."
421 * * The operator is multiply (*), where both operands are matrices or
422 * one operand is a vector and the other a matrix. A right vector
423 * operand is treated as a column vector and a left vector operand as a
424 * row vector. In all these cases, it is required that the number of
425 * columns of the left operand is equal to the number of rows of the
426 * right operand. Then, the multiply (*) operation does a linear
427 * algebraic multiply, yielding an object that has the same number of
428 * rows as the left operand and the same number of columns as the right
429 * operand. Section 5.10 "Vector and Matrix Operations" explains in
430 * more detail how vectors and matrices are operated on."
433 if (type_a
== type_b
)
436 const glsl_type
*type
= glsl_type::get_mul_type(type_a
, type_b
);
438 if (type
== glsl_type::error_type
) {
439 _mesa_glsl_error(loc
, state
,
440 "size mismatch for matrix multiplication");
447 /* "All other cases are illegal."
449 _mesa_glsl_error(loc
, state
, "type mismatch");
450 return glsl_type::error_type
;
454 static const struct glsl_type
*
455 unary_arithmetic_result_type(const struct glsl_type
*type
,
456 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
458 /* From GLSL 1.50 spec, page 57:
460 * "The arithmetic unary operators negate (-), post- and pre-increment
461 * and decrement (-- and ++) operate on integer or floating-point
462 * values (including vectors and matrices). All unary operators work
463 * component-wise on their operands. These result with the same type
466 if (!type
->is_numeric()) {
467 _mesa_glsl_error(loc
, state
,
468 "operands to arithmetic operators must be numeric");
469 return glsl_type::error_type
;
476 * \brief Return the result type of a bit-logic operation.
478 * If the given types to the bit-logic operator are invalid, return
479 * glsl_type::error_type.
481 * \param type_a Type of LHS of bit-logic op
482 * \param type_b Type of RHS of bit-logic op
484 static const struct glsl_type
*
485 bit_logic_result_type(const struct glsl_type
*type_a
,
486 const struct glsl_type
*type_b
,
488 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
490 if (!state
->check_bitwise_operations_allowed(loc
)) {
491 return glsl_type::error_type
;
494 /* From page 50 (page 56 of PDF) of GLSL 1.30 spec:
496 * "The bitwise operators and (&), exclusive-or (^), and inclusive-or
497 * (|). The operands must be of type signed or unsigned integers or
500 if (!type_a
->is_integer()) {
501 _mesa_glsl_error(loc
, state
, "LHS of `%s' must be an integer",
502 ast_expression::operator_string(op
));
503 return glsl_type::error_type
;
505 if (!type_b
->is_integer()) {
506 _mesa_glsl_error(loc
, state
, "RHS of `%s' must be an integer",
507 ast_expression::operator_string(op
));
508 return glsl_type::error_type
;
511 /* "The fundamental types of the operands (signed or unsigned) must
514 if (type_a
->base_type
!= type_b
->base_type
) {
515 _mesa_glsl_error(loc
, state
, "operands of `%s' must have the same "
516 "base type", ast_expression::operator_string(op
));
517 return glsl_type::error_type
;
520 /* "The operands cannot be vectors of differing size." */
521 if (type_a
->is_vector() &&
522 type_b
->is_vector() &&
523 type_a
->vector_elements
!= type_b
->vector_elements
) {
524 _mesa_glsl_error(loc
, state
, "operands of `%s' cannot be vectors of "
525 "different sizes", ast_expression::operator_string(op
));
526 return glsl_type::error_type
;
529 /* "If one operand is a scalar and the other a vector, the scalar is
530 * applied component-wise to the vector, resulting in the same type as
531 * the vector. The fundamental types of the operands [...] will be the
532 * resulting fundamental type."
534 if (type_a
->is_scalar())
540 static const struct glsl_type
*
541 modulus_result_type(const struct glsl_type
*type_a
,
542 const struct glsl_type
*type_b
,
543 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
545 if (!state
->check_version(130, 300, loc
, "operator '%%' is reserved")) {
546 return glsl_type::error_type
;
549 /* From GLSL 1.50 spec, page 56:
550 * "The operator modulus (%) operates on signed or unsigned integers or
551 * integer vectors. The operand types must both be signed or both be
554 if (!type_a
->is_integer()) {
555 _mesa_glsl_error(loc
, state
, "LHS of operator %% must be an integer");
556 return glsl_type::error_type
;
558 if (!type_b
->is_integer()) {
559 _mesa_glsl_error(loc
, state
, "RHS of operator %% must be an integer");
560 return glsl_type::error_type
;
562 if (type_a
->base_type
!= type_b
->base_type
) {
563 _mesa_glsl_error(loc
, state
,
564 "operands of %% must have the same base type");
565 return glsl_type::error_type
;
568 /* "The operands cannot be vectors of differing size. If one operand is
569 * a scalar and the other vector, then the scalar is applied component-
570 * wise to the vector, resulting in the same type as the vector. If both
571 * are vectors of the same size, the result is computed component-wise."
573 if (type_a
->is_vector()) {
574 if (!type_b
->is_vector()
575 || (type_a
->vector_elements
== type_b
->vector_elements
))
580 /* "The operator modulus (%) is not defined for any other data types
581 * (non-integer types)."
583 _mesa_glsl_error(loc
, state
, "type mismatch");
584 return glsl_type::error_type
;
588 static const struct glsl_type
*
589 relational_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
590 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
592 const glsl_type
*type_a
= value_a
->type
;
593 const glsl_type
*type_b
= value_b
->type
;
595 /* From GLSL 1.50 spec, page 56:
596 * "The relational operators greater than (>), less than (<), greater
597 * than or equal (>=), and less than or equal (<=) operate only on
598 * scalar integer and scalar floating-point expressions."
600 if (!type_a
->is_numeric()
601 || !type_b
->is_numeric()
602 || !type_a
->is_scalar()
603 || !type_b
->is_scalar()) {
604 _mesa_glsl_error(loc
, state
,
605 "operands to relational operators must be scalar and "
607 return glsl_type::error_type
;
610 /* "Either the operands' types must match, or the conversions from
611 * Section 4.1.10 "Implicit Conversions" will be applied to the integer
612 * operand, after which the types must match."
614 if (!apply_implicit_conversion(type_a
, value_b
, state
)
615 && !apply_implicit_conversion(type_b
, value_a
, state
)) {
616 _mesa_glsl_error(loc
, state
,
617 "could not implicitly convert operands to "
618 "relational operator");
619 return glsl_type::error_type
;
621 type_a
= value_a
->type
;
622 type_b
= value_b
->type
;
624 if (type_a
->base_type
!= type_b
->base_type
) {
625 _mesa_glsl_error(loc
, state
, "base type mismatch");
626 return glsl_type::error_type
;
629 /* "The result is scalar Boolean."
631 return glsl_type::bool_type
;
635 * \brief Return the result type of a bit-shift operation.
637 * If the given types to the bit-shift operator are invalid, return
638 * glsl_type::error_type.
640 * \param type_a Type of LHS of bit-shift op
641 * \param type_b Type of RHS of bit-shift op
643 static const struct glsl_type
*
644 shift_result_type(const struct glsl_type
*type_a
,
645 const struct glsl_type
*type_b
,
647 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
649 if (!state
->check_bitwise_operations_allowed(loc
)) {
650 return glsl_type::error_type
;
653 /* From page 50 (page 56 of the PDF) of the GLSL 1.30 spec:
655 * "The shift operators (<<) and (>>). For both operators, the operands
656 * must be signed or unsigned integers or integer vectors. One operand
657 * can be signed while the other is unsigned."
659 if (!type_a
->is_integer()) {
660 _mesa_glsl_error(loc
, state
, "LHS of operator %s must be an integer or "
661 "integer vector", ast_expression::operator_string(op
));
662 return glsl_type::error_type
;
665 if (!type_b
->is_integer()) {
666 _mesa_glsl_error(loc
, state
, "RHS of operator %s must be an integer or "
667 "integer vector", ast_expression::operator_string(op
));
668 return glsl_type::error_type
;
671 /* "If the first operand is a scalar, the second operand has to be
674 if (type_a
->is_scalar() && !type_b
->is_scalar()) {
675 _mesa_glsl_error(loc
, state
, "if the first operand of %s is scalar, the "
676 "second must be scalar as well",
677 ast_expression::operator_string(op
));
678 return glsl_type::error_type
;
681 /* If both operands are vectors, check that they have same number of
684 if (type_a
->is_vector() &&
685 type_b
->is_vector() &&
686 type_a
->vector_elements
!= type_b
->vector_elements
) {
687 _mesa_glsl_error(loc
, state
, "vector operands to operator %s must "
688 "have same number of elements",
689 ast_expression::operator_string(op
));
690 return glsl_type::error_type
;
693 /* "In all cases, the resulting type will be the same type as the left
700 * Returns the innermost array index expression in an rvalue tree.
701 * This is the largest indexing level -- if an array of blocks, then
702 * it is the block index rather than an indexing expression for an
703 * array-typed member of an array of blocks.
706 find_innermost_array_index(ir_rvalue
*rv
)
708 ir_dereference_array
*last
= NULL
;
710 if (rv
->as_dereference_array()) {
711 last
= rv
->as_dereference_array();
713 } else if (rv
->as_dereference_record())
714 rv
= rv
->as_dereference_record()->record
;
715 else if (rv
->as_swizzle())
716 rv
= rv
->as_swizzle()->val
;
722 return last
->array_index
;
728 * Validates that a value can be assigned to a location with a specified type
730 * Validates that \c rhs can be assigned to some location. If the types are
731 * not an exact match but an automatic conversion is possible, \c rhs will be
735 * \c NULL if \c rhs cannot be assigned to a location with type \c lhs_type.
736 * Otherwise the actual RHS to be assigned will be returned. This may be
737 * \c rhs, or it may be \c rhs after some type conversion.
740 * In addition to being used for assignments, this function is used to
741 * type-check return values.
744 validate_assignment(struct _mesa_glsl_parse_state
*state
,
745 YYLTYPE loc
, ir_rvalue
*lhs
,
746 ir_rvalue
*rhs
, bool is_initializer
)
748 /* If there is already some error in the RHS, just return it. Anything
749 * else will lead to an avalanche of error message back to the user.
751 if (rhs
->type
->is_error())
754 /* In the Tessellation Control Shader:
755 * If a per-vertex output variable is used as an l-value, it is an error
756 * if the expression indicating the vertex number is not the identifier
759 if (state
->stage
== MESA_SHADER_TESS_CTRL
) {
760 ir_variable
*var
= lhs
->variable_referenced();
761 if (var
->data
.mode
== ir_var_shader_out
&& !var
->data
.patch
) {
762 ir_rvalue
*index
= find_innermost_array_index(lhs
);
763 ir_variable
*index_var
= index
? index
->variable_referenced() : NULL
;
764 if (!index_var
|| strcmp(index_var
->name
, "gl_InvocationID") != 0) {
765 _mesa_glsl_error(&loc
, state
,
766 "Tessellation control shader outputs can only "
767 "be indexed by gl_InvocationID");
773 /* If the types are identical, the assignment can trivially proceed.
775 if (rhs
->type
== lhs
->type
)
778 /* If the array element types are the same and the LHS is unsized,
779 * the assignment is okay for initializers embedded in variable
782 * Note: Whole-array assignments are not permitted in GLSL 1.10, but this
783 * is handled by ir_dereference::is_lvalue.
785 if (lhs
->type
->is_unsized_array() && rhs
->type
->is_array()
786 && (lhs
->type
->fields
.array
== rhs
->type
->fields
.array
)) {
787 if (is_initializer
) {
790 _mesa_glsl_error(&loc
, state
,
791 "implicitly sized arrays cannot be assigned");
796 /* Check for implicit conversion in GLSL 1.20 */
797 if (apply_implicit_conversion(lhs
->type
, rhs
, state
)) {
798 if (rhs
->type
== lhs
->type
)
802 _mesa_glsl_error(&loc
, state
,
803 "%s of type %s cannot be assigned to "
804 "variable of type %s",
805 is_initializer
? "initializer" : "value",
806 rhs
->type
->name
, lhs
->type
->name
);
812 mark_whole_array_access(ir_rvalue
*access
)
814 ir_dereference_variable
*deref
= access
->as_dereference_variable();
816 if (deref
&& deref
->var
) {
817 deref
->var
->data
.max_array_access
= deref
->type
->length
- 1;
822 do_assignment(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
,
823 const char *non_lvalue_description
,
824 ir_rvalue
*lhs
, ir_rvalue
*rhs
,
825 ir_rvalue
**out_rvalue
, bool needs_rvalue
,
830 bool error_emitted
= (lhs
->type
->is_error() || rhs
->type
->is_error());
831 ir_rvalue
*extract_channel
= NULL
;
833 /* If the assignment LHS comes back as an ir_binop_vector_extract
834 * expression, move it to the RHS as an ir_triop_vector_insert.
836 if (lhs
->ir_type
== ir_type_expression
) {
837 ir_expression
*const lhs_expr
= lhs
->as_expression();
839 if (unlikely(lhs_expr
->operation
== ir_binop_vector_extract
)) {
841 validate_assignment(state
, lhs_loc
, lhs
,
842 rhs
, is_initializer
);
844 if (new_rhs
== NULL
) {
848 * - LHS: (expression float vector_extract <vec> <channel>)
852 * - RHS: (expression vec2 vector_insert <vec> <channel> <scalar>)
854 * The LHS type is now a vector instead of a scalar. Since GLSL
855 * allows assignments to be used as rvalues, we need to re-extract
856 * the channel from assignment_temp when returning the rvalue.
858 extract_channel
= lhs_expr
->operands
[1];
859 rhs
= new(ctx
) ir_expression(ir_triop_vector_insert
,
860 lhs_expr
->operands
[0]->type
,
861 lhs_expr
->operands
[0],
864 lhs
= lhs_expr
->operands
[0]->clone(ctx
, NULL
);
869 ir_variable
*lhs_var
= lhs
->variable_referenced();
871 lhs_var
->data
.assigned
= true;
873 if (!error_emitted
) {
874 if (non_lvalue_description
!= NULL
) {
875 _mesa_glsl_error(&lhs_loc
, state
,
877 non_lvalue_description
);
878 error_emitted
= true;
879 } else if (lhs_var
!= NULL
&& (lhs_var
->data
.read_only
||
880 (lhs_var
->data
.mode
== ir_var_shader_storage
&&
881 lhs_var
->data
.image_read_only
))) {
882 /* We can have image_read_only set on both images and buffer variables,
883 * but in the former there is a distinction between assignments to
884 * the variable itself (read_only) and to the memory they point to
885 * (image_read_only), while in the case of buffer variables there is
886 * no such distinction, that is why this check here is limited to
887 * buffer variables alone.
889 _mesa_glsl_error(&lhs_loc
, state
,
890 "assignment to read-only variable '%s'",
892 error_emitted
= true;
893 } else if (lhs
->type
->is_array() &&
894 !state
->check_version(120, 300, &lhs_loc
,
895 "whole array assignment forbidden")) {
896 /* From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
898 * "Other binary or unary expressions, non-dereferenced
899 * arrays, function names, swizzles with repeated fields,
900 * and constants cannot be l-values."
902 * The restriction on arrays is lifted in GLSL 1.20 and GLSL ES 3.00.
904 error_emitted
= true;
905 } else if (!lhs
->is_lvalue()) {
906 _mesa_glsl_error(& lhs_loc
, state
, "non-lvalue in assignment");
907 error_emitted
= true;
912 validate_assignment(state
, lhs_loc
, lhs
, rhs
, is_initializer
);
913 if (new_rhs
!= NULL
) {
916 /* If the LHS array was not declared with a size, it takes it size from
917 * the RHS. If the LHS is an l-value and a whole array, it must be a
918 * dereference of a variable. Any other case would require that the LHS
919 * is either not an l-value or not a whole array.
921 if (lhs
->type
->is_unsized_array()) {
922 ir_dereference
*const d
= lhs
->as_dereference();
926 ir_variable
*const var
= d
->variable_referenced();
930 if (var
->data
.max_array_access
>= unsigned(rhs
->type
->array_size())) {
931 /* FINISHME: This should actually log the location of the RHS. */
932 _mesa_glsl_error(& lhs_loc
, state
, "array size must be > %u due to "
934 var
->data
.max_array_access
);
937 var
->type
= glsl_type::get_array_instance(lhs
->type
->fields
.array
,
938 rhs
->type
->array_size());
941 if (lhs
->type
->is_array()) {
942 mark_whole_array_access(rhs
);
943 mark_whole_array_access(lhs
);
947 /* Most callers of do_assignment (assign, add_assign, pre_inc/dec,
948 * but not post_inc) need the converted assigned value as an rvalue
949 * to handle things like:
954 ir_variable
*var
= new(ctx
) ir_variable(rhs
->type
, "assignment_tmp",
956 instructions
->push_tail(var
);
957 instructions
->push_tail(assign(var
, rhs
));
959 if (!error_emitted
) {
960 ir_dereference_variable
*deref_var
= new(ctx
) ir_dereference_variable(var
);
961 instructions
->push_tail(new(ctx
) ir_assignment(lhs
, deref_var
));
963 ir_rvalue
*rvalue
= new(ctx
) ir_dereference_variable(var
);
965 if (extract_channel
) {
966 rvalue
= new(ctx
) ir_expression(ir_binop_vector_extract
,
968 extract_channel
->clone(ctx
, NULL
));
971 *out_rvalue
= rvalue
;
974 instructions
->push_tail(new(ctx
) ir_assignment(lhs
, rhs
));
978 return error_emitted
;
982 get_lvalue_copy(exec_list
*instructions
, ir_rvalue
*lvalue
)
984 void *ctx
= ralloc_parent(lvalue
);
987 var
= new(ctx
) ir_variable(lvalue
->type
, "_post_incdec_tmp",
989 instructions
->push_tail(var
);
991 instructions
->push_tail(new(ctx
) ir_assignment(new(ctx
) ir_dereference_variable(var
),
994 return new(ctx
) ir_dereference_variable(var
);
999 ast_node::hir(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
)
1001 (void) instructions
;
1008 ast_function_expression::hir_no_rvalue(exec_list
*instructions
,
1009 struct _mesa_glsl_parse_state
*state
)
1011 (void)hir(instructions
, state
);
1015 ast_aggregate_initializer::hir_no_rvalue(exec_list
*instructions
,
1016 struct _mesa_glsl_parse_state
*state
)
1018 (void)hir(instructions
, state
);
1022 do_comparison(void *mem_ctx
, int operation
, ir_rvalue
*op0
, ir_rvalue
*op1
)
1025 ir_rvalue
*cmp
= NULL
;
1027 if (operation
== ir_binop_all_equal
)
1028 join_op
= ir_binop_logic_and
;
1030 join_op
= ir_binop_logic_or
;
1032 switch (op0
->type
->base_type
) {
1033 case GLSL_TYPE_FLOAT
:
1034 case GLSL_TYPE_UINT
:
1036 case GLSL_TYPE_BOOL
:
1037 case GLSL_TYPE_DOUBLE
:
1038 return new(mem_ctx
) ir_expression(operation
, op0
, op1
);
1040 case GLSL_TYPE_ARRAY
: {
1041 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
1042 ir_rvalue
*e0
, *e1
, *result
;
1044 e0
= new(mem_ctx
) ir_dereference_array(op0
->clone(mem_ctx
, NULL
),
1045 new(mem_ctx
) ir_constant(i
));
1046 e1
= new(mem_ctx
) ir_dereference_array(op1
->clone(mem_ctx
, NULL
),
1047 new(mem_ctx
) ir_constant(i
));
1048 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
1051 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
1057 mark_whole_array_access(op0
);
1058 mark_whole_array_access(op1
);
1062 case GLSL_TYPE_STRUCT
: {
1063 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
1064 ir_rvalue
*e0
, *e1
, *result
;
1065 const char *field_name
= op0
->type
->fields
.structure
[i
].name
;
1067 e0
= new(mem_ctx
) ir_dereference_record(op0
->clone(mem_ctx
, NULL
),
1069 e1
= new(mem_ctx
) ir_dereference_record(op1
->clone(mem_ctx
, NULL
),
1071 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
1074 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
1082 case GLSL_TYPE_ERROR
:
1083 case GLSL_TYPE_VOID
:
1084 case GLSL_TYPE_SAMPLER
:
1085 case GLSL_TYPE_IMAGE
:
1086 case GLSL_TYPE_INTERFACE
:
1087 case GLSL_TYPE_FUNCTION
:
1088 case GLSL_TYPE_ATOMIC_UINT
:
1089 case GLSL_TYPE_SUBROUTINE
:
1090 /* I assume a comparison of a struct containing a sampler just
1091 * ignores the sampler present in the type.
1097 cmp
= new(mem_ctx
) ir_constant(true);
1102 /* For logical operations, we want to ensure that the operands are
1103 * scalar booleans. If it isn't, emit an error and return a constant
1104 * boolean to avoid triggering cascading error messages.
1107 get_scalar_boolean_operand(exec_list
*instructions
,
1108 struct _mesa_glsl_parse_state
*state
,
1109 ast_expression
*parent_expr
,
1111 const char *operand_name
,
1112 bool *error_emitted
)
1114 ast_expression
*expr
= parent_expr
->subexpressions
[operand
];
1116 ir_rvalue
*val
= expr
->hir(instructions
, state
);
1118 if (val
->type
->is_boolean() && val
->type
->is_scalar())
1121 if (!*error_emitted
) {
1122 YYLTYPE loc
= expr
->get_location();
1123 _mesa_glsl_error(&loc
, state
, "%s of `%s' must be scalar boolean",
1125 parent_expr
->operator_string(parent_expr
->oper
));
1126 *error_emitted
= true;
1129 return new(ctx
) ir_constant(true);
1133 * If name refers to a builtin array whose maximum allowed size is less than
1134 * size, report an error and return true. Otherwise return false.
1137 check_builtin_array_max_size(const char *name
, unsigned size
,
1138 YYLTYPE loc
, struct _mesa_glsl_parse_state
*state
)
1140 if ((strcmp("gl_TexCoord", name
) == 0)
1141 && (size
> state
->Const
.MaxTextureCoords
)) {
1142 /* From page 54 (page 60 of the PDF) of the GLSL 1.20 spec:
1144 * "The size [of gl_TexCoord] can be at most
1145 * gl_MaxTextureCoords."
1147 _mesa_glsl_error(&loc
, state
, "`gl_TexCoord' array size cannot "
1148 "be larger than gl_MaxTextureCoords (%u)",
1149 state
->Const
.MaxTextureCoords
);
1150 } else if (strcmp("gl_ClipDistance", name
) == 0
1151 && size
> state
->Const
.MaxClipPlanes
) {
1152 /* From section 7.1 (Vertex Shader Special Variables) of the
1155 * "The gl_ClipDistance array is predeclared as unsized and
1156 * must be sized by the shader either redeclaring it with a
1157 * size or indexing it only with integral constant
1158 * expressions. ... The size can be at most
1159 * gl_MaxClipDistances."
1161 _mesa_glsl_error(&loc
, state
, "`gl_ClipDistance' array size cannot "
1162 "be larger than gl_MaxClipDistances (%u)",
1163 state
->Const
.MaxClipPlanes
);
1168 * Create the constant 1, of a which is appropriate for incrementing and
1169 * decrementing values of the given GLSL type. For example, if type is vec4,
1170 * this creates a constant value of 1.0 having type float.
1172 * If the given type is invalid for increment and decrement operators, return
1173 * a floating point 1--the error will be detected later.
1176 constant_one_for_inc_dec(void *ctx
, const glsl_type
*type
)
1178 switch (type
->base_type
) {
1179 case GLSL_TYPE_UINT
:
1180 return new(ctx
) ir_constant((unsigned) 1);
1182 return new(ctx
) ir_constant(1);
1184 case GLSL_TYPE_FLOAT
:
1185 return new(ctx
) ir_constant(1.0f
);
1190 ast_expression::hir(exec_list
*instructions
,
1191 struct _mesa_glsl_parse_state
*state
)
1193 return do_hir(instructions
, state
, true);
1197 ast_expression::hir_no_rvalue(exec_list
*instructions
,
1198 struct _mesa_glsl_parse_state
*state
)
1200 do_hir(instructions
, state
, false);
1204 ast_expression::do_hir(exec_list
*instructions
,
1205 struct _mesa_glsl_parse_state
*state
,
1209 static const int operations
[AST_NUM_OPERATORS
] = {
1210 -1, /* ast_assign doesn't convert to ir_expression. */
1211 -1, /* ast_plus doesn't convert to ir_expression. */
1225 ir_binop_any_nequal
,
1235 /* Note: The following block of expression types actually convert
1236 * to multiple IR instructions.
1238 ir_binop_mul
, /* ast_mul_assign */
1239 ir_binop_div
, /* ast_div_assign */
1240 ir_binop_mod
, /* ast_mod_assign */
1241 ir_binop_add
, /* ast_add_assign */
1242 ir_binop_sub
, /* ast_sub_assign */
1243 ir_binop_lshift
, /* ast_ls_assign */
1244 ir_binop_rshift
, /* ast_rs_assign */
1245 ir_binop_bit_and
, /* ast_and_assign */
1246 ir_binop_bit_xor
, /* ast_xor_assign */
1247 ir_binop_bit_or
, /* ast_or_assign */
1249 -1, /* ast_conditional doesn't convert to ir_expression. */
1250 ir_binop_add
, /* ast_pre_inc. */
1251 ir_binop_sub
, /* ast_pre_dec. */
1252 ir_binop_add
, /* ast_post_inc. */
1253 ir_binop_sub
, /* ast_post_dec. */
1254 -1, /* ast_field_selection doesn't conv to ir_expression. */
1255 -1, /* ast_array_index doesn't convert to ir_expression. */
1256 -1, /* ast_function_call doesn't conv to ir_expression. */
1257 -1, /* ast_identifier doesn't convert to ir_expression. */
1258 -1, /* ast_int_constant doesn't convert to ir_expression. */
1259 -1, /* ast_uint_constant doesn't conv to ir_expression. */
1260 -1, /* ast_float_constant doesn't conv to ir_expression. */
1261 -1, /* ast_bool_constant doesn't conv to ir_expression. */
1262 -1, /* ast_sequence doesn't convert to ir_expression. */
1264 ir_rvalue
*result
= NULL
;
1266 const struct glsl_type
*type
; /* a temporary variable for switch cases */
1267 bool error_emitted
= false;
1270 loc
= this->get_location();
1272 switch (this->oper
) {
1274 assert(!"ast_aggregate: Should never get here.");
1278 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1279 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1282 do_assignment(instructions
, state
,
1283 this->subexpressions
[0]->non_lvalue_description
,
1284 op
[0], op
[1], &result
, needs_rvalue
, false,
1285 this->subexpressions
[0]->get_location());
1290 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1292 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1294 error_emitted
= type
->is_error();
1300 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1302 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1304 error_emitted
= type
->is_error();
1306 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1314 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1315 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1317 type
= arithmetic_result_type(op
[0], op
[1],
1318 (this->oper
== ast_mul
),
1320 error_emitted
= type
->is_error();
1322 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1327 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1328 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1330 type
= modulus_result_type(op
[0]->type
, op
[1]->type
, state
, & loc
);
1332 assert(operations
[this->oper
] == ir_binop_mod
);
1334 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1336 error_emitted
= type
->is_error();
1341 if (!state
->check_bitwise_operations_allowed(&loc
)) {
1342 error_emitted
= true;
1345 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1346 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1347 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1349 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1351 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1358 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1359 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1361 type
= relational_result_type(op
[0], op
[1], state
, & loc
);
1363 /* The relational operators must either generate an error or result
1364 * in a scalar boolean. See page 57 of the GLSL 1.50 spec.
1366 assert(type
->is_error()
1367 || ((type
->base_type
== GLSL_TYPE_BOOL
)
1368 && type
->is_scalar()));
1370 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1372 error_emitted
= type
->is_error();
1377 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1378 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1380 /* From page 58 (page 64 of the PDF) of the GLSL 1.50 spec:
1382 * "The equality operators equal (==), and not equal (!=)
1383 * operate on all types. They result in a scalar Boolean. If
1384 * the operand types do not match, then there must be a
1385 * conversion from Section 4.1.10 "Implicit Conversions"
1386 * applied to one operand that can make them match, in which
1387 * case this conversion is done."
1390 if (op
[0]->type
== glsl_type::void_type
|| op
[1]->type
== glsl_type::void_type
) {
1391 _mesa_glsl_error(& loc
, state
, "`%s': wrong operand types: "
1392 "no operation `%1$s' exists that takes a left-hand "
1393 "operand of type 'void' or a right operand of type "
1394 "'void'", (this->oper
== ast_equal
) ? "==" : "!=");
1395 error_emitted
= true;
1396 } else if ((!apply_implicit_conversion(op
[0]->type
, op
[1], state
)
1397 && !apply_implicit_conversion(op
[1]->type
, op
[0], state
))
1398 || (op
[0]->type
!= op
[1]->type
)) {
1399 _mesa_glsl_error(& loc
, state
, "operands of `%s' must have the same "
1400 "type", (this->oper
== ast_equal
) ? "==" : "!=");
1401 error_emitted
= true;
1402 } else if ((op
[0]->type
->is_array() || op
[1]->type
->is_array()) &&
1403 !state
->check_version(120, 300, &loc
,
1404 "array comparisons forbidden")) {
1405 error_emitted
= true;
1406 } else if ((op
[0]->type
->contains_opaque() ||
1407 op
[1]->type
->contains_opaque())) {
1408 _mesa_glsl_error(&loc
, state
, "opaque type comparisons forbidden");
1409 error_emitted
= true;
1412 if (error_emitted
) {
1413 result
= new(ctx
) ir_constant(false);
1415 result
= do_comparison(ctx
, operations
[this->oper
], op
[0], op
[1]);
1416 assert(result
->type
== glsl_type::bool_type
);
1423 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1424 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1425 type
= bit_logic_result_type(op
[0]->type
, op
[1]->type
, this->oper
,
1427 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1429 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1433 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1435 if (!state
->check_bitwise_operations_allowed(&loc
)) {
1436 error_emitted
= true;
1439 if (!op
[0]->type
->is_integer()) {
1440 _mesa_glsl_error(&loc
, state
, "operand of `~' must be an integer");
1441 error_emitted
= true;
1444 type
= error_emitted
? glsl_type::error_type
: op
[0]->type
;
1445 result
= new(ctx
) ir_expression(ir_unop_bit_not
, type
, op
[0], NULL
);
1448 case ast_logic_and
: {
1449 exec_list rhs_instructions
;
1450 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1451 "LHS", &error_emitted
);
1452 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1453 "RHS", &error_emitted
);
1455 if (rhs_instructions
.is_empty()) {
1456 result
= new(ctx
) ir_expression(ir_binop_logic_and
, op
[0], op
[1]);
1457 type
= result
->type
;
1459 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1462 instructions
->push_tail(tmp
);
1464 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1465 instructions
->push_tail(stmt
);
1467 stmt
->then_instructions
.append_list(&rhs_instructions
);
1468 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1469 ir_assignment
*const then_assign
=
1470 new(ctx
) ir_assignment(then_deref
, op
[1]);
1471 stmt
->then_instructions
.push_tail(then_assign
);
1473 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1474 ir_assignment
*const else_assign
=
1475 new(ctx
) ir_assignment(else_deref
, new(ctx
) ir_constant(false));
1476 stmt
->else_instructions
.push_tail(else_assign
);
1478 result
= new(ctx
) ir_dereference_variable(tmp
);
1484 case ast_logic_or
: {
1485 exec_list rhs_instructions
;
1486 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1487 "LHS", &error_emitted
);
1488 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1489 "RHS", &error_emitted
);
1491 if (rhs_instructions
.is_empty()) {
1492 result
= new(ctx
) ir_expression(ir_binop_logic_or
, op
[0], op
[1]);
1493 type
= result
->type
;
1495 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1498 instructions
->push_tail(tmp
);
1500 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1501 instructions
->push_tail(stmt
);
1503 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1504 ir_assignment
*const then_assign
=
1505 new(ctx
) ir_assignment(then_deref
, new(ctx
) ir_constant(true));
1506 stmt
->then_instructions
.push_tail(then_assign
);
1508 stmt
->else_instructions
.append_list(&rhs_instructions
);
1509 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1510 ir_assignment
*const else_assign
=
1511 new(ctx
) ir_assignment(else_deref
, op
[1]);
1512 stmt
->else_instructions
.push_tail(else_assign
);
1514 result
= new(ctx
) ir_dereference_variable(tmp
);
1521 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1523 * "The logical binary operators and (&&), or ( | | ), and
1524 * exclusive or (^^). They operate only on two Boolean
1525 * expressions and result in a Boolean expression."
1527 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0, "LHS",
1529 op
[1] = get_scalar_boolean_operand(instructions
, state
, this, 1, "RHS",
1532 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1537 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1538 "operand", &error_emitted
);
1540 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1544 case ast_mul_assign
:
1545 case ast_div_assign
:
1546 case ast_add_assign
:
1547 case ast_sub_assign
: {
1548 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1549 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1551 type
= arithmetic_result_type(op
[0], op
[1],
1552 (this->oper
== ast_mul_assign
),
1555 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1559 do_assignment(instructions
, state
,
1560 this->subexpressions
[0]->non_lvalue_description
,
1561 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1562 &result
, needs_rvalue
, false,
1563 this->subexpressions
[0]->get_location());
1565 /* GLSL 1.10 does not allow array assignment. However, we don't have to
1566 * explicitly test for this because none of the binary expression
1567 * operators allow array operands either.
1573 case ast_mod_assign
: {
1574 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1575 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1577 type
= modulus_result_type(op
[0]->type
, op
[1]->type
, state
, & loc
);
1579 assert(operations
[this->oper
] == ir_binop_mod
);
1581 ir_rvalue
*temp_rhs
;
1582 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1586 do_assignment(instructions
, state
,
1587 this->subexpressions
[0]->non_lvalue_description
,
1588 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1589 &result
, needs_rvalue
, false,
1590 this->subexpressions
[0]->get_location());
1595 case ast_rs_assign
: {
1596 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1597 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1598 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1600 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1601 type
, op
[0], op
[1]);
1603 do_assignment(instructions
, state
,
1604 this->subexpressions
[0]->non_lvalue_description
,
1605 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1606 &result
, needs_rvalue
, false,
1607 this->subexpressions
[0]->get_location());
1611 case ast_and_assign
:
1612 case ast_xor_assign
:
1613 case ast_or_assign
: {
1614 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1615 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1616 type
= bit_logic_result_type(op
[0]->type
, op
[1]->type
, this->oper
,
1618 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1619 type
, op
[0], op
[1]);
1621 do_assignment(instructions
, state
,
1622 this->subexpressions
[0]->non_lvalue_description
,
1623 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1624 &result
, needs_rvalue
, false,
1625 this->subexpressions
[0]->get_location());
1629 case ast_conditional
: {
1630 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1632 * "The ternary selection operator (?:). It operates on three
1633 * expressions (exp1 ? exp2 : exp3). This operator evaluates the
1634 * first expression, which must result in a scalar Boolean."
1636 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1637 "condition", &error_emitted
);
1639 /* The :? operator is implemented by generating an anonymous temporary
1640 * followed by an if-statement. The last instruction in each branch of
1641 * the if-statement assigns a value to the anonymous temporary. This
1642 * temporary is the r-value of the expression.
1644 exec_list then_instructions
;
1645 exec_list else_instructions
;
1647 op
[1] = this->subexpressions
[1]->hir(&then_instructions
, state
);
1648 op
[2] = this->subexpressions
[2]->hir(&else_instructions
, state
);
1650 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1652 * "The second and third expressions can be any type, as
1653 * long their types match, or there is a conversion in
1654 * Section 4.1.10 "Implicit Conversions" that can be applied
1655 * to one of the expressions to make their types match. This
1656 * resulting matching type is the type of the entire
1659 if ((!apply_implicit_conversion(op
[1]->type
, op
[2], state
)
1660 && !apply_implicit_conversion(op
[2]->type
, op
[1], state
))
1661 || (op
[1]->type
!= op
[2]->type
)) {
1662 YYLTYPE loc
= this->subexpressions
[1]->get_location();
1664 _mesa_glsl_error(& loc
, state
, "second and third operands of ?: "
1665 "operator must have matching types");
1666 error_emitted
= true;
1667 type
= glsl_type::error_type
;
1672 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1674 * "The second and third expressions must be the same type, but can
1675 * be of any type other than an array."
1677 if (type
->is_array() &&
1678 !state
->check_version(120, 300, &loc
,
1679 "second and third operands of ?: operator "
1680 "cannot be arrays")) {
1681 error_emitted
= true;
1684 /* From section 4.1.7 of the GLSL 4.50 spec (Opaque Types):
1686 * "Except for array indexing, structure member selection, and
1687 * parentheses, opaque variables are not allowed to be operands in
1688 * expressions; such use results in a compile-time error."
1690 if (type
->contains_opaque()) {
1691 _mesa_glsl_error(&loc
, state
, "opaque variables cannot be operands "
1692 "of the ?: operator");
1693 error_emitted
= true;
1696 ir_constant
*cond_val
= op
[0]->constant_expression_value();
1698 if (then_instructions
.is_empty()
1699 && else_instructions
.is_empty()
1700 && cond_val
!= NULL
) {
1701 result
= cond_val
->value
.b
[0] ? op
[1] : op
[2];
1703 /* The copy to conditional_tmp reads the whole array. */
1704 if (type
->is_array()) {
1705 mark_whole_array_access(op
[1]);
1706 mark_whole_array_access(op
[2]);
1709 ir_variable
*const tmp
=
1710 new(ctx
) ir_variable(type
, "conditional_tmp", ir_var_temporary
);
1711 instructions
->push_tail(tmp
);
1713 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1714 instructions
->push_tail(stmt
);
1716 then_instructions
.move_nodes_to(& stmt
->then_instructions
);
1717 ir_dereference
*const then_deref
=
1718 new(ctx
) ir_dereference_variable(tmp
);
1719 ir_assignment
*const then_assign
=
1720 new(ctx
) ir_assignment(then_deref
, op
[1]);
1721 stmt
->then_instructions
.push_tail(then_assign
);
1723 else_instructions
.move_nodes_to(& stmt
->else_instructions
);
1724 ir_dereference
*const else_deref
=
1725 new(ctx
) ir_dereference_variable(tmp
);
1726 ir_assignment
*const else_assign
=
1727 new(ctx
) ir_assignment(else_deref
, op
[2]);
1728 stmt
->else_instructions
.push_tail(else_assign
);
1730 result
= new(ctx
) ir_dereference_variable(tmp
);
1737 this->non_lvalue_description
= (this->oper
== ast_pre_inc
)
1738 ? "pre-increment operation" : "pre-decrement operation";
1740 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1741 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1743 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1745 ir_rvalue
*temp_rhs
;
1746 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1750 do_assignment(instructions
, state
,
1751 this->subexpressions
[0]->non_lvalue_description
,
1752 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1753 &result
, needs_rvalue
, false,
1754 this->subexpressions
[0]->get_location());
1759 case ast_post_dec
: {
1760 this->non_lvalue_description
= (this->oper
== ast_post_inc
)
1761 ? "post-increment operation" : "post-decrement operation";
1762 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1763 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1765 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1767 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1769 ir_rvalue
*temp_rhs
;
1770 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1773 /* Get a temporary of a copy of the lvalue before it's modified.
1774 * This may get thrown away later.
1776 result
= get_lvalue_copy(instructions
, op
[0]->clone(ctx
, NULL
));
1778 ir_rvalue
*junk_rvalue
;
1780 do_assignment(instructions
, state
,
1781 this->subexpressions
[0]->non_lvalue_description
,
1782 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1783 &junk_rvalue
, false, false,
1784 this->subexpressions
[0]->get_location());
1789 case ast_field_selection
:
1790 result
= _mesa_ast_field_selection_to_hir(this, instructions
, state
);
1793 case ast_array_index
: {
1794 YYLTYPE index_loc
= subexpressions
[1]->get_location();
1796 op
[0] = subexpressions
[0]->hir(instructions
, state
);
1797 op
[1] = subexpressions
[1]->hir(instructions
, state
);
1799 result
= _mesa_ast_array_index_to_hir(ctx
, state
, op
[0], op
[1],
1802 if (result
->type
->is_error())
1803 error_emitted
= true;
1808 case ast_function_call
:
1809 /* Should *NEVER* get here. ast_function_call should always be handled
1810 * by ast_function_expression::hir.
1815 case ast_identifier
: {
1816 /* ast_identifier can appear several places in a full abstract syntax
1817 * tree. This particular use must be at location specified in the grammar
1818 * as 'variable_identifier'.
1821 state
->symbols
->get_variable(this->primary_expression
.identifier
);
1824 var
->data
.used
= true;
1825 result
= new(ctx
) ir_dereference_variable(var
);
1827 _mesa_glsl_error(& loc
, state
, "`%s' undeclared",
1828 this->primary_expression
.identifier
);
1830 result
= ir_rvalue::error_value(ctx
);
1831 error_emitted
= true;
1836 case ast_int_constant
:
1837 result
= new(ctx
) ir_constant(this->primary_expression
.int_constant
);
1840 case ast_uint_constant
:
1841 result
= new(ctx
) ir_constant(this->primary_expression
.uint_constant
);
1844 case ast_float_constant
:
1845 result
= new(ctx
) ir_constant(this->primary_expression
.float_constant
);
1848 case ast_bool_constant
:
1849 result
= new(ctx
) ir_constant(bool(this->primary_expression
.bool_constant
));
1852 case ast_double_constant
:
1853 result
= new(ctx
) ir_constant(this->primary_expression
.double_constant
);
1856 case ast_sequence
: {
1857 /* It should not be possible to generate a sequence in the AST without
1858 * any expressions in it.
1860 assert(!this->expressions
.is_empty());
1862 /* The r-value of a sequence is the last expression in the sequence. If
1863 * the other expressions in the sequence do not have side-effects (and
1864 * therefore add instructions to the instruction list), they get dropped
1867 exec_node
*previous_tail_pred
= NULL
;
1868 YYLTYPE previous_operand_loc
= loc
;
1870 foreach_list_typed (ast_node
, ast
, link
, &this->expressions
) {
1871 /* If one of the operands of comma operator does not generate any
1872 * code, we want to emit a warning. At each pass through the loop
1873 * previous_tail_pred will point to the last instruction in the
1874 * stream *before* processing the previous operand. Naturally,
1875 * instructions->tail_pred will point to the last instruction in the
1876 * stream *after* processing the previous operand. If the two
1877 * pointers match, then the previous operand had no effect.
1879 * The warning behavior here differs slightly from GCC. GCC will
1880 * only emit a warning if none of the left-hand operands have an
1881 * effect. However, it will emit a warning for each. I believe that
1882 * there are some cases in C (especially with GCC extensions) where
1883 * it is useful to have an intermediate step in a sequence have no
1884 * effect, but I don't think these cases exist in GLSL. Either way,
1885 * it would be a giant hassle to replicate that behavior.
1887 if (previous_tail_pred
== instructions
->tail_pred
) {
1888 _mesa_glsl_warning(&previous_operand_loc
, state
,
1889 "left-hand operand of comma expression has "
1893 /* tail_pred is directly accessed instead of using the get_tail()
1894 * method for performance reasons. get_tail() has extra code to
1895 * return NULL when the list is empty. We don't care about that
1896 * here, so using tail_pred directly is fine.
1898 previous_tail_pred
= instructions
->tail_pred
;
1899 previous_operand_loc
= ast
->get_location();
1901 result
= ast
->hir(instructions
, state
);
1904 /* Any errors should have already been emitted in the loop above.
1906 error_emitted
= true;
1910 type
= NULL
; /* use result->type, not type. */
1911 assert(result
!= NULL
|| !needs_rvalue
);
1913 if (result
&& result
->type
->is_error() && !error_emitted
)
1914 _mesa_glsl_error(& loc
, state
, "type mismatch");
1921 ast_expression_statement::hir(exec_list
*instructions
,
1922 struct _mesa_glsl_parse_state
*state
)
1924 /* It is possible to have expression statements that don't have an
1925 * expression. This is the solitary semicolon:
1927 * for (i = 0; i < 5; i++)
1930 * In this case the expression will be NULL. Test for NULL and don't do
1931 * anything in that case.
1933 if (expression
!= NULL
)
1934 expression
->hir_no_rvalue(instructions
, state
);
1936 /* Statements do not have r-values.
1943 ast_compound_statement::hir(exec_list
*instructions
,
1944 struct _mesa_glsl_parse_state
*state
)
1947 state
->symbols
->push_scope();
1949 foreach_list_typed (ast_node
, ast
, link
, &this->statements
)
1950 ast
->hir(instructions
, state
);
1953 state
->symbols
->pop_scope();
1955 /* Compound statements do not have r-values.
1961 * Evaluate the given exec_node (which should be an ast_node representing
1962 * a single array dimension) and return its integer value.
1965 process_array_size(exec_node
*node
,
1966 struct _mesa_glsl_parse_state
*state
)
1968 exec_list dummy_instructions
;
1970 ast_node
*array_size
= exec_node_data(ast_node
, node
, link
);
1971 ir_rvalue
*const ir
= array_size
->hir(& dummy_instructions
, state
);
1972 YYLTYPE loc
= array_size
->get_location();
1975 _mesa_glsl_error(& loc
, state
,
1976 "array size could not be resolved");
1980 if (!ir
->type
->is_integer()) {
1981 _mesa_glsl_error(& loc
, state
,
1982 "array size must be integer type");
1986 if (!ir
->type
->is_scalar()) {
1987 _mesa_glsl_error(& loc
, state
,
1988 "array size must be scalar type");
1992 ir_constant
*const size
= ir
->constant_expression_value();
1994 _mesa_glsl_error(& loc
, state
, "array size must be a "
1995 "constant valued expression");
1999 if (size
->value
.i
[0] <= 0) {
2000 _mesa_glsl_error(& loc
, state
, "array size must be > 0");
2004 assert(size
->type
== ir
->type
);
2006 /* If the array size is const (and we've verified that
2007 * it is) then no instructions should have been emitted
2008 * when we converted it to HIR. If they were emitted,
2009 * then either the array size isn't const after all, or
2010 * we are emitting unnecessary instructions.
2012 assert(dummy_instructions
.is_empty());
2014 return size
->value
.u
[0];
2017 static const glsl_type
*
2018 process_array_type(YYLTYPE
*loc
, const glsl_type
*base
,
2019 ast_array_specifier
*array_specifier
,
2020 struct _mesa_glsl_parse_state
*state
)
2022 const glsl_type
*array_type
= base
;
2024 if (array_specifier
!= NULL
) {
2025 if (base
->is_array()) {
2027 /* From page 19 (page 25) of the GLSL 1.20 spec:
2029 * "Only one-dimensional arrays may be declared."
2031 if (!state
->ARB_arrays_of_arrays_enable
) {
2032 _mesa_glsl_error(loc
, state
,
2033 "invalid array of `%s'"
2034 "GL_ARB_arrays_of_arrays "
2035 "required for defining arrays of arrays",
2037 return glsl_type::error_type
;
2040 if (base
->length
== 0) {
2041 _mesa_glsl_error(loc
, state
,
2042 "only the outermost array dimension can "
2045 return glsl_type::error_type
;
2049 for (exec_node
*node
= array_specifier
->array_dimensions
.tail_pred
;
2050 !node
->is_head_sentinel(); node
= node
->prev
) {
2051 unsigned array_size
= process_array_size(node
, state
);
2052 array_type
= glsl_type::get_array_instance(array_type
, array_size
);
2055 if (array_specifier
->is_unsized_array
)
2056 array_type
= glsl_type::get_array_instance(array_type
, 0);
2064 ast_type_specifier::glsl_type(const char **name
,
2065 struct _mesa_glsl_parse_state
*state
) const
2067 const struct glsl_type
*type
;
2069 type
= state
->symbols
->get_type(this->type_name
);
2070 *name
= this->type_name
;
2072 YYLTYPE loc
= this->get_location();
2073 type
= process_array_type(&loc
, type
, this->array_specifier
, state
);
2079 ast_fully_specified_type::glsl_type(const char **name
,
2080 struct _mesa_glsl_parse_state
*state
) const
2082 const struct glsl_type
*type
= this->specifier
->glsl_type(name
, state
);
2087 if (type
->base_type
== GLSL_TYPE_FLOAT
2089 && state
->stage
== MESA_SHADER_FRAGMENT
2090 && this->qualifier
.precision
== ast_precision_none
2091 && state
->symbols
->get_variable("#default precision") == NULL
) {
2092 YYLTYPE loc
= this->get_location();
2093 _mesa_glsl_error(&loc
, state
,
2094 "no precision specified this scope for type `%s'",
2102 * Determine whether a toplevel variable declaration declares a varying. This
2103 * function operates by examining the variable's mode and the shader target,
2104 * so it correctly identifies linkage variables regardless of whether they are
2105 * declared using the deprecated "varying" syntax or the new "in/out" syntax.
2107 * Passing a non-toplevel variable declaration (e.g. a function parameter) to
2108 * this function will produce undefined results.
2111 is_varying_var(ir_variable
*var
, gl_shader_stage target
)
2114 case MESA_SHADER_VERTEX
:
2115 return var
->data
.mode
== ir_var_shader_out
;
2116 case MESA_SHADER_FRAGMENT
:
2117 return var
->data
.mode
== ir_var_shader_in
;
2119 return var
->data
.mode
== ir_var_shader_out
|| var
->data
.mode
== ir_var_shader_in
;
2125 * Matrix layout qualifiers are only allowed on certain types
2128 validate_matrix_layout_for_type(struct _mesa_glsl_parse_state
*state
,
2130 const glsl_type
*type
,
2133 if (var
&& !var
->is_in_buffer_block()) {
2134 /* Layout qualifiers may only apply to interface blocks and fields in
2137 _mesa_glsl_error(loc
, state
,
2138 "uniform block layout qualifiers row_major and "
2139 "column_major may not be applied to variables "
2140 "outside of uniform blocks");
2141 } else if (!type
->is_matrix()) {
2142 /* The OpenGL ES 3.0 conformance tests did not originally allow
2143 * matrix layout qualifiers on non-matrices. However, the OpenGL
2144 * 4.4 and OpenGL ES 3.0 (revision TBD) specifications were
2145 * amended to specifically allow these layouts on all types. Emit
2146 * a warning so that people know their code may not be portable.
2148 _mesa_glsl_warning(loc
, state
,
2149 "uniform block layout qualifiers row_major and "
2150 "column_major applied to non-matrix types may "
2151 "be rejected by older compilers");
2152 } else if (type
->is_record()) {
2153 /* We allow 'layout(row_major)' on structure types because it's the only
2154 * way to get row-major layouts on matrices contained in structures.
2156 _mesa_glsl_warning(loc
, state
,
2157 "uniform block layout qualifiers row_major and "
2158 "column_major applied to structure types is not "
2159 "strictly conformant and may be rejected by other "
2165 validate_binding_qualifier(struct _mesa_glsl_parse_state
*state
,
2167 const glsl_type
*type
,
2168 const ast_type_qualifier
*qual
)
2170 if (!qual
->flags
.q
.uniform
&& !qual
->flags
.q
.buffer
) {
2171 _mesa_glsl_error(loc
, state
,
2172 "the \"binding\" qualifier only applies to uniforms and "
2173 "shader storage buffer objects");
2177 if (qual
->binding
< 0) {
2178 _mesa_glsl_error(loc
, state
, "binding values must be >= 0");
2182 const struct gl_context
*const ctx
= state
->ctx
;
2183 unsigned elements
= type
->is_array() ? type
->arrays_of_arrays_size() : 1;
2184 unsigned max_index
= qual
->binding
+ elements
- 1;
2185 const glsl_type
*base_type
= type
->without_array();
2187 if (base_type
->is_interface()) {
2188 /* UBOs. From page 60 of the GLSL 4.20 specification:
2189 * "If the binding point for any uniform block instance is less than zero,
2190 * or greater than or equal to the implementation-dependent maximum
2191 * number of uniform buffer bindings, a compilation error will occur.
2192 * When the binding identifier is used with a uniform block instanced as
2193 * an array of size N, all elements of the array from binding through
2194 * binding + N – 1 must be within this range."
2196 * The implementation-dependent maximum is GL_MAX_UNIFORM_BUFFER_BINDINGS.
2198 if (qual
->flags
.q
.uniform
&&
2199 max_index
>= ctx
->Const
.MaxUniformBufferBindings
) {
2200 _mesa_glsl_error(loc
, state
, "layout(binding = %d) for %d UBOs exceeds "
2201 "the maximum number of UBO binding points (%d)",
2202 qual
->binding
, elements
,
2203 ctx
->Const
.MaxUniformBufferBindings
);
2207 /* SSBOs. From page 67 of the GLSL 4.30 specification:
2208 * "If the binding point for any uniform or shader storage block instance
2209 * is less than zero, or greater than or equal to the
2210 * implementation-dependent maximum number of uniform buffer bindings, a
2211 * compile-time error will occur. When the binding identifier is used
2212 * with a uniform or shader storage block instanced as an array of size
2213 * N, all elements of the array from binding through binding + N – 1 must
2214 * be within this range."
2216 if (qual
->flags
.q
.buffer
&&
2217 max_index
>= ctx
->Const
.MaxShaderStorageBufferBindings
) {
2218 _mesa_glsl_error(loc
, state
, "layout(binding = %d) for %d SSBOs exceeds "
2219 "the maximum number of SSBO binding points (%d)",
2220 qual
->binding
, elements
,
2221 ctx
->Const
.MaxShaderStorageBufferBindings
);
2224 } else if (base_type
->is_sampler()) {
2225 /* Samplers. From page 63 of the GLSL 4.20 specification:
2226 * "If the binding is less than zero, or greater than or equal to the
2227 * implementation-dependent maximum supported number of units, a
2228 * compilation error will occur. When the binding identifier is used
2229 * with an array of size N, all elements of the array from binding
2230 * through binding + N - 1 must be within this range."
2232 unsigned limit
= ctx
->Const
.MaxCombinedTextureImageUnits
;
2234 if (max_index
>= limit
) {
2235 _mesa_glsl_error(loc
, state
, "layout(binding = %d) for %d samplers "
2236 "exceeds the maximum number of texture image units "
2237 "(%d)", qual
->binding
, elements
, limit
);
2241 } else if (base_type
->contains_atomic()) {
2242 assert(ctx
->Const
.MaxAtomicBufferBindings
<= MAX_COMBINED_ATOMIC_BUFFERS
);
2243 if (unsigned(qual
->binding
) >= ctx
->Const
.MaxAtomicBufferBindings
) {
2244 _mesa_glsl_error(loc
, state
, "layout(binding = %d) exceeds the "
2245 " maximum number of atomic counter buffer bindings"
2246 "(%d)", qual
->binding
,
2247 ctx
->Const
.MaxAtomicBufferBindings
);
2251 } else if (state
->is_version(420, 310) && base_type
->is_image()) {
2252 assert(ctx
->Const
.MaxImageUnits
<= MAX_IMAGE_UNITS
);
2253 if (max_index
>= ctx
->Const
.MaxImageUnits
) {
2254 _mesa_glsl_error(loc
, state
, "Image binding %d exceeds the "
2255 " maximum number of image units (%d)", max_index
,
2256 ctx
->Const
.MaxImageUnits
);
2261 _mesa_glsl_error(loc
, state
,
2262 "the \"binding\" qualifier only applies to uniform "
2263 "blocks, opaque variables, or arrays thereof");
2271 static glsl_interp_qualifier
2272 interpret_interpolation_qualifier(const struct ast_type_qualifier
*qual
,
2273 ir_variable_mode mode
,
2274 struct _mesa_glsl_parse_state
*state
,
2277 glsl_interp_qualifier interpolation
;
2278 if (qual
->flags
.q
.flat
)
2279 interpolation
= INTERP_QUALIFIER_FLAT
;
2280 else if (qual
->flags
.q
.noperspective
)
2281 interpolation
= INTERP_QUALIFIER_NOPERSPECTIVE
;
2282 else if (qual
->flags
.q
.smooth
)
2283 interpolation
= INTERP_QUALIFIER_SMOOTH
;
2285 interpolation
= INTERP_QUALIFIER_NONE
;
2287 if (interpolation
!= INTERP_QUALIFIER_NONE
) {
2288 if (mode
!= ir_var_shader_in
&& mode
!= ir_var_shader_out
) {
2289 _mesa_glsl_error(loc
, state
,
2290 "interpolation qualifier `%s' can only be applied to "
2291 "shader inputs or outputs.",
2292 interpolation_string(interpolation
));
2296 if ((state
->stage
== MESA_SHADER_VERTEX
&& mode
== ir_var_shader_in
) ||
2297 (state
->stage
== MESA_SHADER_FRAGMENT
&& mode
== ir_var_shader_out
)) {
2298 _mesa_glsl_error(loc
, state
,
2299 "interpolation qualifier `%s' cannot be applied to "
2300 "vertex shader inputs or fragment shader outputs",
2301 interpolation_string(interpolation
));
2305 return interpolation
;
2310 validate_explicit_location(const struct ast_type_qualifier
*qual
,
2312 struct _mesa_glsl_parse_state
*state
,
2317 /* Checks for GL_ARB_explicit_uniform_location. */
2318 if (qual
->flags
.q
.uniform
) {
2319 if (!state
->check_explicit_uniform_location_allowed(loc
, var
))
2322 const struct gl_context
*const ctx
= state
->ctx
;
2323 unsigned max_loc
= qual
->location
+ var
->type
->uniform_locations() - 1;
2325 /* ARB_explicit_uniform_location specification states:
2327 * "The explicitly defined locations and the generated locations
2328 * must be in the range of 0 to MAX_UNIFORM_LOCATIONS minus one."
2330 * "Valid locations for default-block uniform variable locations
2331 * are in the range of 0 to the implementation-defined maximum
2332 * number of uniform locations."
2334 if (qual
->location
< 0) {
2335 _mesa_glsl_error(loc
, state
,
2336 "explicit location < 0 for uniform %s", var
->name
);
2340 if (max_loc
>= ctx
->Const
.MaxUserAssignableUniformLocations
) {
2341 _mesa_glsl_error(loc
, state
, "location(s) consumed by uniform %s "
2342 ">= MAX_UNIFORM_LOCATIONS (%u)", var
->name
,
2343 ctx
->Const
.MaxUserAssignableUniformLocations
);
2347 var
->data
.explicit_location
= true;
2348 var
->data
.location
= qual
->location
;
2352 /* Between GL_ARB_explicit_attrib_location an
2353 * GL_ARB_separate_shader_objects, the inputs and outputs of any shader
2354 * stage can be assigned explicit locations. The checking here associates
2355 * the correct extension with the correct stage's input / output:
2359 * vertex explicit_loc sso
2360 * tess control sso sso
2363 * fragment sso explicit_loc
2365 switch (state
->stage
) {
2366 case MESA_SHADER_VERTEX
:
2367 if (var
->data
.mode
== ir_var_shader_in
) {
2368 if (!state
->check_explicit_attrib_location_allowed(loc
, var
))
2374 if (var
->data
.mode
== ir_var_shader_out
) {
2375 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
2384 case MESA_SHADER_TESS_CTRL
:
2385 case MESA_SHADER_TESS_EVAL
:
2386 case MESA_SHADER_GEOMETRY
:
2387 if (var
->data
.mode
== ir_var_shader_in
|| var
->data
.mode
== ir_var_shader_out
) {
2388 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
2397 case MESA_SHADER_FRAGMENT
:
2398 if (var
->data
.mode
== ir_var_shader_in
) {
2399 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
2405 if (var
->data
.mode
== ir_var_shader_out
) {
2406 if (!state
->check_explicit_attrib_location_allowed(loc
, var
))
2415 case MESA_SHADER_COMPUTE
:
2416 _mesa_glsl_error(loc
, state
,
2417 "compute shader variables cannot be given "
2418 "explicit locations");
2423 _mesa_glsl_error(loc
, state
,
2424 "%s cannot be given an explicit location in %s shader",
2426 _mesa_shader_stage_to_string(state
->stage
));
2428 var
->data
.explicit_location
= true;
2430 /* This bit of silliness is needed because invalid explicit locations
2431 * are supposed to be flagged during linking. Small negative values
2432 * biased by VERT_ATTRIB_GENERIC0 or FRAG_RESULT_DATA0 could alias
2433 * built-in values (e.g., -16+VERT_ATTRIB_GENERIC0 = VERT_ATTRIB_POS).
2434 * The linker needs to be able to differentiate these cases. This
2435 * ensures that negative values stay negative.
2437 if (qual
->location
>= 0) {
2438 switch (state
->stage
) {
2439 case MESA_SHADER_VERTEX
:
2440 var
->data
.location
= (var
->data
.mode
== ir_var_shader_in
)
2441 ? (qual
->location
+ VERT_ATTRIB_GENERIC0
)
2442 : (qual
->location
+ VARYING_SLOT_VAR0
);
2445 case MESA_SHADER_TESS_CTRL
:
2446 case MESA_SHADER_TESS_EVAL
:
2447 case MESA_SHADER_GEOMETRY
:
2448 if (var
->data
.patch
)
2449 var
->data
.location
= qual
->location
+ VARYING_SLOT_PATCH0
;
2451 var
->data
.location
= qual
->location
+ VARYING_SLOT_VAR0
;
2454 case MESA_SHADER_FRAGMENT
:
2455 var
->data
.location
= (var
->data
.mode
== ir_var_shader_out
)
2456 ? (qual
->location
+ FRAG_RESULT_DATA0
)
2457 : (qual
->location
+ VARYING_SLOT_VAR0
);
2459 case MESA_SHADER_COMPUTE
:
2460 assert(!"Unexpected shader type");
2464 var
->data
.location
= qual
->location
;
2467 if (qual
->flags
.q
.explicit_index
) {
2468 /* From the GLSL 4.30 specification, section 4.4.2 (Output
2469 * Layout Qualifiers):
2471 * "It is also a compile-time error if a fragment shader
2472 * sets a layout index to less than 0 or greater than 1."
2474 * Older specifications don't mandate a behavior; we take
2475 * this as a clarification and always generate the error.
2477 if (qual
->index
< 0 || qual
->index
> 1) {
2478 _mesa_glsl_error(loc
, state
,
2479 "explicit index may only be 0 or 1");
2481 var
->data
.explicit_index
= true;
2482 var
->data
.index
= qual
->index
;
2489 apply_image_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
2491 struct _mesa_glsl_parse_state
*state
,
2494 const glsl_type
*base_type
= var
->type
->without_array();
2496 if (base_type
->is_image()) {
2497 if (var
->data
.mode
!= ir_var_uniform
&&
2498 var
->data
.mode
!= ir_var_function_in
) {
2499 _mesa_glsl_error(loc
, state
, "image variables may only be declared as "
2500 "function parameters or uniform-qualified "
2501 "global variables");
2504 var
->data
.image_read_only
|= qual
->flags
.q
.read_only
;
2505 var
->data
.image_write_only
|= qual
->flags
.q
.write_only
;
2506 var
->data
.image_coherent
|= qual
->flags
.q
.coherent
;
2507 var
->data
.image_volatile
|= qual
->flags
.q
._volatile
;
2508 var
->data
.image_restrict
|= qual
->flags
.q
.restrict_flag
;
2509 var
->data
.read_only
= true;
2511 if (qual
->flags
.q
.explicit_image_format
) {
2512 if (var
->data
.mode
== ir_var_function_in
) {
2513 _mesa_glsl_error(loc
, state
, "format qualifiers cannot be "
2514 "used on image function parameters");
2517 if (qual
->image_base_type
!= base_type
->sampler_type
) {
2518 _mesa_glsl_error(loc
, state
, "format qualifier doesn't match the "
2519 "base data type of the image");
2522 var
->data
.image_format
= qual
->image_format
;
2524 if (var
->data
.mode
== ir_var_uniform
) {
2525 if (state
->es_shader
) {
2526 _mesa_glsl_error(loc
, state
, "all image uniforms "
2527 "must have a format layout qualifier");
2529 } else if (!qual
->flags
.q
.write_only
) {
2530 _mesa_glsl_error(loc
, state
, "image uniforms not qualified with "
2531 "`writeonly' must have a format layout "
2536 var
->data
.image_format
= GL_NONE
;
2539 /* From page 70 of the GLSL ES 3.1 specification:
2541 * "Except for image variables qualified with the format qualifiers
2542 * r32f, r32i, and r32ui, image variables must specify either memory
2543 * qualifier readonly or the memory qualifier writeonly."
2545 if (state
->es_shader
&&
2546 var
->data
.image_format
!= GL_R32F
&&
2547 var
->data
.image_format
!= GL_R32I
&&
2548 var
->data
.image_format
!= GL_R32UI
&&
2549 !var
->data
.image_read_only
&&
2550 !var
->data
.image_write_only
) {
2551 _mesa_glsl_error(loc
, state
, "image variables of format other than "
2552 "r32f, r32i or r32ui must be qualified `readonly' or "
2556 } else if (qual
->flags
.q
.read_only
||
2557 qual
->flags
.q
.write_only
||
2558 qual
->flags
.q
.coherent
||
2559 qual
->flags
.q
._volatile
||
2560 qual
->flags
.q
.restrict_flag
||
2561 qual
->flags
.q
.explicit_image_format
) {
2562 _mesa_glsl_error(loc
, state
, "memory qualifiers may only be applied to "
2567 static inline const char*
2568 get_layout_qualifier_string(bool origin_upper_left
, bool pixel_center_integer
)
2570 if (origin_upper_left
&& pixel_center_integer
)
2571 return "origin_upper_left, pixel_center_integer";
2572 else if (origin_upper_left
)
2573 return "origin_upper_left";
2574 else if (pixel_center_integer
)
2575 return "pixel_center_integer";
2581 is_conflicting_fragcoord_redeclaration(struct _mesa_glsl_parse_state
*state
,
2582 const struct ast_type_qualifier
*qual
)
2584 /* If gl_FragCoord was previously declared, and the qualifiers were
2585 * different in any way, return true.
2587 if (state
->fs_redeclares_gl_fragcoord
) {
2588 return (state
->fs_pixel_center_integer
!= qual
->flags
.q
.pixel_center_integer
2589 || state
->fs_origin_upper_left
!= qual
->flags
.q
.origin_upper_left
);
2596 apply_type_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
2598 struct _mesa_glsl_parse_state
*state
,
2602 STATIC_ASSERT(sizeof(qual
->flags
.q
) <= sizeof(qual
->flags
.i
));
2604 if (qual
->flags
.q
.invariant
) {
2605 if (var
->data
.used
) {
2606 _mesa_glsl_error(loc
, state
,
2607 "variable `%s' may not be redeclared "
2608 "`invariant' after being used",
2611 var
->data
.invariant
= 1;
2615 if (qual
->flags
.q
.precise
) {
2616 if (var
->data
.used
) {
2617 _mesa_glsl_error(loc
, state
,
2618 "variable `%s' may not be redeclared "
2619 "`precise' after being used",
2622 var
->data
.precise
= 1;
2626 if (qual
->flags
.q
.subroutine
&& !qual
->flags
.q
.uniform
) {
2627 _mesa_glsl_error(loc
, state
,
2628 "`subroutine' may only be applied to uniforms, "
2629 "subroutine type declarations, or function definitions");
2632 if (qual
->flags
.q
.constant
|| qual
->flags
.q
.attribute
2633 || qual
->flags
.q
.uniform
2634 || (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_FRAGMENT
)))
2635 var
->data
.read_only
= 1;
2637 if (qual
->flags
.q
.centroid
)
2638 var
->data
.centroid
= 1;
2640 if (qual
->flags
.q
.sample
)
2641 var
->data
.sample
= 1;
2643 if (state
->stage
== MESA_SHADER_GEOMETRY
&&
2644 qual
->flags
.q
.out
&& qual
->flags
.q
.stream
) {
2645 var
->data
.stream
= qual
->stream
;
2648 if (qual
->flags
.q
.patch
)
2649 var
->data
.patch
= 1;
2651 if (qual
->flags
.q
.attribute
&& state
->stage
!= MESA_SHADER_VERTEX
) {
2652 var
->type
= glsl_type::error_type
;
2653 _mesa_glsl_error(loc
, state
,
2654 "`attribute' variables may not be declared in the "
2656 _mesa_shader_stage_to_string(state
->stage
));
2659 /* Disallow layout qualifiers which may only appear on layout declarations. */
2660 if (qual
->flags
.q
.prim_type
) {
2661 _mesa_glsl_error(loc
, state
,
2662 "Primitive type may only be specified on GS input or output "
2663 "layout declaration, not on variables.");
2666 /* Section 6.1.1 (Function Calling Conventions) of the GLSL 1.10 spec says:
2668 * "However, the const qualifier cannot be used with out or inout."
2670 * The same section of the GLSL 4.40 spec further clarifies this saying:
2672 * "The const qualifier cannot be used with out or inout, or a
2673 * compile-time error results."
2675 if (is_parameter
&& qual
->flags
.q
.constant
&& qual
->flags
.q
.out
) {
2676 _mesa_glsl_error(loc
, state
,
2677 "`const' may not be applied to `out' or `inout' "
2678 "function parameters");
2681 /* If there is no qualifier that changes the mode of the variable, leave
2682 * the setting alone.
2684 assert(var
->data
.mode
!= ir_var_temporary
);
2685 if (qual
->flags
.q
.in
&& qual
->flags
.q
.out
)
2686 var
->data
.mode
= ir_var_function_inout
;
2687 else if (qual
->flags
.q
.in
)
2688 var
->data
.mode
= is_parameter
? ir_var_function_in
: ir_var_shader_in
;
2689 else if (qual
->flags
.q
.attribute
2690 || (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_FRAGMENT
)))
2691 var
->data
.mode
= ir_var_shader_in
;
2692 else if (qual
->flags
.q
.out
)
2693 var
->data
.mode
= is_parameter
? ir_var_function_out
: ir_var_shader_out
;
2694 else if (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_VERTEX
))
2695 var
->data
.mode
= ir_var_shader_out
;
2696 else if (qual
->flags
.q
.uniform
)
2697 var
->data
.mode
= ir_var_uniform
;
2698 else if (qual
->flags
.q
.buffer
)
2699 var
->data
.mode
= ir_var_shader_storage
;
2701 if (!is_parameter
&& is_varying_var(var
, state
->stage
)) {
2702 /* User-defined ins/outs are not permitted in compute shaders. */
2703 if (state
->stage
== MESA_SHADER_COMPUTE
) {
2704 _mesa_glsl_error(loc
, state
,
2705 "user-defined input and output variables are not "
2706 "permitted in compute shaders");
2709 /* This variable is being used to link data between shader stages (in
2710 * pre-glsl-1.30 parlance, it's a "varying"). Check that it has a type
2711 * that is allowed for such purposes.
2713 * From page 25 (page 31 of the PDF) of the GLSL 1.10 spec:
2715 * "The varying qualifier can be used only with the data types
2716 * float, vec2, vec3, vec4, mat2, mat3, and mat4, or arrays of
2719 * This was relaxed in GLSL version 1.30 and GLSL ES version 3.00. From
2720 * page 31 (page 37 of the PDF) of the GLSL 1.30 spec:
2722 * "Fragment inputs can only be signed and unsigned integers and
2723 * integer vectors, float, floating-point vectors, matrices, or
2724 * arrays of these. Structures cannot be input.
2726 * Similar text exists in the section on vertex shader outputs.
2728 * Similar text exists in the GLSL ES 3.00 spec, except that the GLSL ES
2729 * 3.00 spec allows structs as well. Varying structs are also allowed
2732 switch (var
->type
->get_scalar_type()->base_type
) {
2733 case GLSL_TYPE_FLOAT
:
2734 /* Ok in all GLSL versions */
2736 case GLSL_TYPE_UINT
:
2738 if (state
->is_version(130, 300))
2740 _mesa_glsl_error(loc
, state
,
2741 "varying variables must be of base type float in %s",
2742 state
->get_version_string());
2744 case GLSL_TYPE_STRUCT
:
2745 if (state
->is_version(150, 300))
2747 _mesa_glsl_error(loc
, state
,
2748 "varying variables may not be of type struct");
2750 case GLSL_TYPE_DOUBLE
:
2753 _mesa_glsl_error(loc
, state
, "illegal type for a varying variable");
2758 if (state
->all_invariant
&& (state
->current_function
== NULL
)) {
2759 switch (state
->stage
) {
2760 case MESA_SHADER_VERTEX
:
2761 if (var
->data
.mode
== ir_var_shader_out
)
2762 var
->data
.invariant
= true;
2764 case MESA_SHADER_TESS_CTRL
:
2765 case MESA_SHADER_TESS_EVAL
:
2766 case MESA_SHADER_GEOMETRY
:
2767 if ((var
->data
.mode
== ir_var_shader_in
)
2768 || (var
->data
.mode
== ir_var_shader_out
))
2769 var
->data
.invariant
= true;
2771 case MESA_SHADER_FRAGMENT
:
2772 if (var
->data
.mode
== ir_var_shader_in
)
2773 var
->data
.invariant
= true;
2775 case MESA_SHADER_COMPUTE
:
2776 /* Invariance isn't meaningful in compute shaders. */
2781 var
->data
.interpolation
=
2782 interpret_interpolation_qualifier(qual
, (ir_variable_mode
) var
->data
.mode
,
2785 var
->data
.pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
2786 var
->data
.origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
2787 if ((qual
->flags
.q
.origin_upper_left
|| qual
->flags
.q
.pixel_center_integer
)
2788 && (strcmp(var
->name
, "gl_FragCoord") != 0)) {
2789 const char *const qual_string
= (qual
->flags
.q
.origin_upper_left
)
2790 ? "origin_upper_left" : "pixel_center_integer";
2792 _mesa_glsl_error(loc
, state
,
2793 "layout qualifier `%s' can only be applied to "
2794 "fragment shader input `gl_FragCoord'",
2798 if (var
->name
!= NULL
&& strcmp(var
->name
, "gl_FragCoord") == 0) {
2800 /* Section 4.3.8.1, page 39 of GLSL 1.50 spec says:
2802 * "Within any shader, the first redeclarations of gl_FragCoord
2803 * must appear before any use of gl_FragCoord."
2805 * Generate a compiler error if above condition is not met by the
2808 ir_variable
*earlier
= state
->symbols
->get_variable("gl_FragCoord");
2809 if (earlier
!= NULL
&&
2810 earlier
->data
.used
&&
2811 !state
->fs_redeclares_gl_fragcoord
) {
2812 _mesa_glsl_error(loc
, state
,
2813 "gl_FragCoord used before its first redeclaration "
2814 "in fragment shader");
2817 /* Make sure all gl_FragCoord redeclarations specify the same layout
2820 if (is_conflicting_fragcoord_redeclaration(state
, qual
)) {
2821 const char *const qual_string
=
2822 get_layout_qualifier_string(qual
->flags
.q
.origin_upper_left
,
2823 qual
->flags
.q
.pixel_center_integer
);
2825 const char *const state_string
=
2826 get_layout_qualifier_string(state
->fs_origin_upper_left
,
2827 state
->fs_pixel_center_integer
);
2829 _mesa_glsl_error(loc
, state
,
2830 "gl_FragCoord redeclared with different layout "
2831 "qualifiers (%s) and (%s) ",
2835 state
->fs_origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
2836 state
->fs_pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
2837 state
->fs_redeclares_gl_fragcoord_with_no_layout_qualifiers
=
2838 !qual
->flags
.q
.origin_upper_left
&& !qual
->flags
.q
.pixel_center_integer
;
2839 state
->fs_redeclares_gl_fragcoord
=
2840 state
->fs_origin_upper_left
||
2841 state
->fs_pixel_center_integer
||
2842 state
->fs_redeclares_gl_fragcoord_with_no_layout_qualifiers
;
2845 if (qual
->flags
.q
.explicit_location
) {
2846 validate_explicit_location(qual
, var
, state
, loc
);
2847 } else if (qual
->flags
.q
.explicit_index
) {
2848 _mesa_glsl_error(loc
, state
, "explicit index requires explicit location");
2851 if (qual
->flags
.q
.explicit_binding
&&
2852 validate_binding_qualifier(state
, loc
, var
->type
, qual
)) {
2853 var
->data
.explicit_binding
= true;
2854 var
->data
.binding
= qual
->binding
;
2857 if (var
->type
->contains_atomic()) {
2858 if (var
->data
.mode
== ir_var_uniform
) {
2859 if (var
->data
.explicit_binding
) {
2861 &state
->atomic_counter_offsets
[var
->data
.binding
];
2863 if (*offset
% ATOMIC_COUNTER_SIZE
)
2864 _mesa_glsl_error(loc
, state
,
2865 "misaligned atomic counter offset");
2867 var
->data
.atomic
.offset
= *offset
;
2868 *offset
+= var
->type
->atomic_size();
2871 _mesa_glsl_error(loc
, state
,
2872 "atomic counters require explicit binding point");
2874 } else if (var
->data
.mode
!= ir_var_function_in
) {
2875 _mesa_glsl_error(loc
, state
, "atomic counters may only be declared as "
2876 "function parameters or uniform-qualified "
2877 "global variables");
2881 /* Does the declaration use the deprecated 'attribute' or 'varying'
2884 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
2885 || qual
->flags
.q
.varying
;
2888 /* Validate auxiliary storage qualifiers */
2890 /* From section 4.3.4 of the GLSL 1.30 spec:
2891 * "It is an error to use centroid in in a vertex shader."
2893 * From section 4.3.4 of the GLSL ES 3.00 spec:
2894 * "It is an error to use centroid in or interpolation qualifiers in
2895 * a vertex shader input."
2898 /* Section 4.3.6 of the GLSL 1.30 specification states:
2899 * "It is an error to use centroid out in a fragment shader."
2901 * The GL_ARB_shading_language_420pack extension specification states:
2902 * "It is an error to use auxiliary storage qualifiers or interpolation
2903 * qualifiers on an output in a fragment shader."
2905 if (qual
->flags
.q
.sample
&& (!is_varying_var(var
, state
->stage
) || uses_deprecated_qualifier
)) {
2906 _mesa_glsl_error(loc
, state
,
2907 "sample qualifier may only be used on `in` or `out` "
2908 "variables between shader stages");
2910 if (qual
->flags
.q
.centroid
&& !is_varying_var(var
, state
->stage
)) {
2911 _mesa_glsl_error(loc
, state
,
2912 "centroid qualifier may only be used with `in', "
2913 "`out' or `varying' variables between shader stages");
2917 /* Is the 'layout' keyword used with parameters that allow relaxed checking.
2918 * Many implementations of GL_ARB_fragment_coord_conventions_enable and some
2919 * implementations (only Mesa?) GL_ARB_explicit_attrib_location_enable
2920 * allowed the layout qualifier to be used with 'varying' and 'attribute'.
2921 * These extensions and all following extensions that add the 'layout'
2922 * keyword have been modified to require the use of 'in' or 'out'.
2924 * The following extension do not allow the deprecated keywords:
2926 * GL_AMD_conservative_depth
2927 * GL_ARB_conservative_depth
2928 * GL_ARB_gpu_shader5
2929 * GL_ARB_separate_shader_objects
2930 * GL_ARB_tessellation_shader
2931 * GL_ARB_transform_feedback3
2932 * GL_ARB_uniform_buffer_object
2934 * It is unknown whether GL_EXT_shader_image_load_store or GL_NV_gpu_shader5
2935 * allow layout with the deprecated keywords.
2937 const bool relaxed_layout_qualifier_checking
=
2938 state
->ARB_fragment_coord_conventions_enable
;
2940 if (qual
->has_layout() && uses_deprecated_qualifier
) {
2941 if (relaxed_layout_qualifier_checking
) {
2942 _mesa_glsl_warning(loc
, state
,
2943 "`layout' qualifier may not be used with "
2944 "`attribute' or `varying'");
2946 _mesa_glsl_error(loc
, state
,
2947 "`layout' qualifier may not be used with "
2948 "`attribute' or `varying'");
2952 /* Layout qualifiers for gl_FragDepth, which are enabled by extension
2953 * AMD_conservative_depth.
2955 int depth_layout_count
= qual
->flags
.q
.depth_any
2956 + qual
->flags
.q
.depth_greater
2957 + qual
->flags
.q
.depth_less
2958 + qual
->flags
.q
.depth_unchanged
;
2959 if (depth_layout_count
> 0
2960 && !state
->AMD_conservative_depth_enable
2961 && !state
->ARB_conservative_depth_enable
) {
2962 _mesa_glsl_error(loc
, state
,
2963 "extension GL_AMD_conservative_depth or "
2964 "GL_ARB_conservative_depth must be enabled "
2965 "to use depth layout qualifiers");
2966 } else if (depth_layout_count
> 0
2967 && strcmp(var
->name
, "gl_FragDepth") != 0) {
2968 _mesa_glsl_error(loc
, state
,
2969 "depth layout qualifiers can be applied only to "
2971 } else if (depth_layout_count
> 1
2972 && strcmp(var
->name
, "gl_FragDepth") == 0) {
2973 _mesa_glsl_error(loc
, state
,
2974 "at most one depth layout qualifier can be applied to "
2977 if (qual
->flags
.q
.depth_any
)
2978 var
->data
.depth_layout
= ir_depth_layout_any
;
2979 else if (qual
->flags
.q
.depth_greater
)
2980 var
->data
.depth_layout
= ir_depth_layout_greater
;
2981 else if (qual
->flags
.q
.depth_less
)
2982 var
->data
.depth_layout
= ir_depth_layout_less
;
2983 else if (qual
->flags
.q
.depth_unchanged
)
2984 var
->data
.depth_layout
= ir_depth_layout_unchanged
;
2986 var
->data
.depth_layout
= ir_depth_layout_none
;
2988 if (qual
->flags
.q
.std140
||
2989 qual
->flags
.q
.std430
||
2990 qual
->flags
.q
.packed
||
2991 qual
->flags
.q
.shared
) {
2992 _mesa_glsl_error(loc
, state
,
2993 "uniform and shader storage block layout qualifiers "
2994 "std140, std430, packed, and shared can only be "
2995 "applied to uniform or shader storage blocks, not "
2999 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
3000 validate_matrix_layout_for_type(state
, loc
, var
->type
, var
);
3003 apply_image_qualifier_to_variable(qual
, var
, state
, loc
);
3005 /* From section 4.4.1.3 of the GLSL 4.50 specification (Fragment Shader
3008 * "Fragment shaders also allow the following layout qualifier on in only
3009 * (not with variable declarations)
3010 * layout-qualifier-id
3011 * early_fragment_tests
3014 if (qual
->flags
.q
.early_fragment_tests
) {
3015 _mesa_glsl_error(loc
, state
, "early_fragment_tests layout qualifier only "
3016 "valid in fragment shader input layout declaration.");
3021 * Get the variable that is being redeclared by this declaration
3023 * Semantic checks to verify the validity of the redeclaration are also
3024 * performed. If semantic checks fail, compilation error will be emitted via
3025 * \c _mesa_glsl_error, but a non-\c NULL pointer will still be returned.
3028 * A pointer to an existing variable in the current scope if the declaration
3029 * is a redeclaration, \c NULL otherwise.
3031 static ir_variable
*
3032 get_variable_being_redeclared(ir_variable
*var
, YYLTYPE loc
,
3033 struct _mesa_glsl_parse_state
*state
,
3034 bool allow_all_redeclarations
)
3036 /* Check if this declaration is actually a re-declaration, either to
3037 * resize an array or add qualifiers to an existing variable.
3039 * This is allowed for variables in the current scope, or when at
3040 * global scope (for built-ins in the implicit outer scope).
3042 ir_variable
*earlier
= state
->symbols
->get_variable(var
->name
);
3043 if (earlier
== NULL
||
3044 (state
->current_function
!= NULL
&&
3045 !state
->symbols
->name_declared_this_scope(var
->name
))) {
3050 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec,
3052 * "It is legal to declare an array without a size and then
3053 * later re-declare the same name as an array of the same
3054 * type and specify a size."
3056 if (earlier
->type
->is_unsized_array() && var
->type
->is_array()
3057 && (var
->type
->fields
.array
== earlier
->type
->fields
.array
)) {
3058 /* FINISHME: This doesn't match the qualifiers on the two
3059 * FINISHME: declarations. It's not 100% clear whether this is
3060 * FINISHME: required or not.
3063 const unsigned size
= unsigned(var
->type
->array_size());
3064 check_builtin_array_max_size(var
->name
, size
, loc
, state
);
3065 if ((size
> 0) && (size
<= earlier
->data
.max_array_access
)) {
3066 _mesa_glsl_error(& loc
, state
, "array size must be > %u due to "
3068 earlier
->data
.max_array_access
);
3071 earlier
->type
= var
->type
;
3074 } else if ((state
->ARB_fragment_coord_conventions_enable
||
3075 state
->is_version(150, 0))
3076 && strcmp(var
->name
, "gl_FragCoord") == 0
3077 && earlier
->type
== var
->type
3078 && earlier
->data
.mode
== var
->data
.mode
) {
3079 /* Allow redeclaration of gl_FragCoord for ARB_fcc layout
3082 earlier
->data
.origin_upper_left
= var
->data
.origin_upper_left
;
3083 earlier
->data
.pixel_center_integer
= var
->data
.pixel_center_integer
;
3085 /* According to section 4.3.7 of the GLSL 1.30 spec,
3086 * the following built-in varaibles can be redeclared with an
3087 * interpolation qualifier:
3090 * * gl_FrontSecondaryColor
3091 * * gl_BackSecondaryColor
3093 * * gl_SecondaryColor
3095 } else if (state
->is_version(130, 0)
3096 && (strcmp(var
->name
, "gl_FrontColor") == 0
3097 || strcmp(var
->name
, "gl_BackColor") == 0
3098 || strcmp(var
->name
, "gl_FrontSecondaryColor") == 0
3099 || strcmp(var
->name
, "gl_BackSecondaryColor") == 0
3100 || strcmp(var
->name
, "gl_Color") == 0
3101 || strcmp(var
->name
, "gl_SecondaryColor") == 0)
3102 && earlier
->type
== var
->type
3103 && earlier
->data
.mode
== var
->data
.mode
) {
3104 earlier
->data
.interpolation
= var
->data
.interpolation
;
3106 /* Layout qualifiers for gl_FragDepth. */
3107 } else if ((state
->AMD_conservative_depth_enable
||
3108 state
->ARB_conservative_depth_enable
)
3109 && strcmp(var
->name
, "gl_FragDepth") == 0
3110 && earlier
->type
== var
->type
3111 && earlier
->data
.mode
== var
->data
.mode
) {
3113 /** From the AMD_conservative_depth spec:
3114 * Within any shader, the first redeclarations of gl_FragDepth
3115 * must appear before any use of gl_FragDepth.
3117 if (earlier
->data
.used
) {
3118 _mesa_glsl_error(&loc
, state
,
3119 "the first redeclaration of gl_FragDepth "
3120 "must appear before any use of gl_FragDepth");
3123 /* Prevent inconsistent redeclaration of depth layout qualifier. */
3124 if (earlier
->data
.depth_layout
!= ir_depth_layout_none
3125 && earlier
->data
.depth_layout
!= var
->data
.depth_layout
) {
3126 _mesa_glsl_error(&loc
, state
,
3127 "gl_FragDepth: depth layout is declared here "
3128 "as '%s, but it was previously declared as "
3130 depth_layout_string(var
->data
.depth_layout
),
3131 depth_layout_string(earlier
->data
.depth_layout
));
3134 earlier
->data
.depth_layout
= var
->data
.depth_layout
;
3136 } else if (allow_all_redeclarations
) {
3137 if (earlier
->data
.mode
!= var
->data
.mode
) {
3138 _mesa_glsl_error(&loc
, state
,
3139 "redeclaration of `%s' with incorrect qualifiers",
3141 } else if (earlier
->type
!= var
->type
) {
3142 _mesa_glsl_error(&loc
, state
,
3143 "redeclaration of `%s' has incorrect type",
3147 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", var
->name
);
3154 * Generate the IR for an initializer in a variable declaration
3157 process_initializer(ir_variable
*var
, ast_declaration
*decl
,
3158 ast_fully_specified_type
*type
,
3159 exec_list
*initializer_instructions
,
3160 struct _mesa_glsl_parse_state
*state
)
3162 ir_rvalue
*result
= NULL
;
3164 YYLTYPE initializer_loc
= decl
->initializer
->get_location();
3166 /* From page 24 (page 30 of the PDF) of the GLSL 1.10 spec:
3168 * "All uniform variables are read-only and are initialized either
3169 * directly by an application via API commands, or indirectly by
3172 if (var
->data
.mode
== ir_var_uniform
) {
3173 state
->check_version(120, 0, &initializer_loc
,
3174 "cannot initialize uniforms");
3177 /* Section 4.3.7 "Buffer Variables" of the GLSL 4.30 spec:
3179 * "Buffer variables cannot have initializers."
3181 if (var
->data
.mode
== ir_var_shader_storage
) {
3182 _mesa_glsl_error(& initializer_loc
, state
,
3183 "SSBO variables cannot have initializers");
3186 /* From section 4.1.7 of the GLSL 4.40 spec:
3188 * "Opaque variables [...] are initialized only through the
3189 * OpenGL API; they cannot be declared with an initializer in a
3192 if (var
->type
->contains_opaque()) {
3193 _mesa_glsl_error(& initializer_loc
, state
,
3194 "cannot initialize opaque variable");
3197 if ((var
->data
.mode
== ir_var_shader_in
) && (state
->current_function
== NULL
)) {
3198 _mesa_glsl_error(& initializer_loc
, state
,
3199 "cannot initialize %s shader input / %s",
3200 _mesa_shader_stage_to_string(state
->stage
),
3201 (state
->stage
== MESA_SHADER_VERTEX
)
3202 ? "attribute" : "varying");
3205 /* If the initializer is an ast_aggregate_initializer, recursively store
3206 * type information from the LHS into it, so that its hir() function can do
3209 if (decl
->initializer
->oper
== ast_aggregate
)
3210 _mesa_ast_set_aggregate_type(var
->type
, decl
->initializer
);
3212 ir_dereference
*const lhs
= new(state
) ir_dereference_variable(var
);
3213 ir_rvalue
*rhs
= decl
->initializer
->hir(initializer_instructions
, state
);
3215 /* Calculate the constant value if this is a const or uniform
3218 if (type
->qualifier
.flags
.q
.constant
3219 || type
->qualifier
.flags
.q
.uniform
) {
3220 ir_rvalue
*new_rhs
= validate_assignment(state
, initializer_loc
,
3222 if (new_rhs
!= NULL
) {
3225 ir_constant
*constant_value
= rhs
->constant_expression_value();
3226 if (!constant_value
) {
3227 /* If ARB_shading_language_420pack is enabled, initializers of
3228 * const-qualified local variables do not have to be constant
3229 * expressions. Const-qualified global variables must still be
3230 * initialized with constant expressions.
3232 if (!state
->ARB_shading_language_420pack_enable
3233 || state
->current_function
== NULL
) {
3234 _mesa_glsl_error(& initializer_loc
, state
,
3235 "initializer of %s variable `%s' must be a "
3236 "constant expression",
3237 (type
->qualifier
.flags
.q
.constant
)
3238 ? "const" : "uniform",
3240 if (var
->type
->is_numeric()) {
3241 /* Reduce cascading errors. */
3242 var
->constant_value
= ir_constant::zero(state
, var
->type
);
3246 rhs
= constant_value
;
3247 var
->constant_value
= constant_value
;
3250 if (var
->type
->is_numeric()) {
3251 /* Reduce cascading errors. */
3252 var
->constant_value
= ir_constant::zero(state
, var
->type
);
3257 if (rhs
&& !rhs
->type
->is_error()) {
3258 bool temp
= var
->data
.read_only
;
3259 if (type
->qualifier
.flags
.q
.constant
)
3260 var
->data
.read_only
= false;
3262 /* Never emit code to initialize a uniform.
3264 const glsl_type
*initializer_type
;
3265 if (!type
->qualifier
.flags
.q
.uniform
) {
3266 do_assignment(initializer_instructions
, state
,
3271 type
->get_location());
3272 initializer_type
= result
->type
;
3274 initializer_type
= rhs
->type
;
3276 var
->constant_initializer
= rhs
->constant_expression_value();
3277 var
->data
.has_initializer
= true;
3279 /* If the declared variable is an unsized array, it must inherrit
3280 * its full type from the initializer. A declaration such as
3282 * uniform float a[] = float[](1.0, 2.0, 3.0, 3.0);
3286 * uniform float a[4] = float[](1.0, 2.0, 3.0, 3.0);
3288 * The assignment generated in the if-statement (below) will also
3289 * automatically handle this case for non-uniforms.
3291 * If the declared variable is not an array, the types must
3292 * already match exactly. As a result, the type assignment
3293 * here can be done unconditionally. For non-uniforms the call
3294 * to do_assignment can change the type of the initializer (via
3295 * the implicit conversion rules). For uniforms the initializer
3296 * must be a constant expression, and the type of that expression
3297 * was validated above.
3299 var
->type
= initializer_type
;
3301 var
->data
.read_only
= temp
;
3308 validate_layout_qualifier_vertex_count(struct _mesa_glsl_parse_state
*state
,
3309 YYLTYPE loc
, ir_variable
*var
,
3310 unsigned num_vertices
,
3312 const char *var_category
)
3314 if (var
->type
->is_unsized_array()) {
3315 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec says:
3317 * All geometry shader input unsized array declarations will be
3318 * sized by an earlier input layout qualifier, when present, as per
3319 * the following table.
3321 * Followed by a table mapping each allowed input layout qualifier to
3322 * the corresponding input length.
3324 * Similarly for tessellation control shader outputs.
3326 if (num_vertices
!= 0)
3327 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
3330 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec
3331 * includes the following examples of compile-time errors:
3333 * // code sequence within one shader...
3334 * in vec4 Color1[]; // size unknown
3335 * ...Color1.length()...// illegal, length() unknown
3336 * in vec4 Color2[2]; // size is 2
3337 * ...Color1.length()...// illegal, Color1 still has no size
3338 * in vec4 Color3[3]; // illegal, input sizes are inconsistent
3339 * layout(lines) in; // legal, input size is 2, matching
3340 * in vec4 Color4[3]; // illegal, contradicts layout
3343 * To detect the case illustrated by Color3, we verify that the size of
3344 * an explicitly-sized array matches the size of any previously declared
3345 * explicitly-sized array. To detect the case illustrated by Color4, we
3346 * verify that the size of an explicitly-sized array is consistent with
3347 * any previously declared input layout.
3349 if (num_vertices
!= 0 && var
->type
->length
!= num_vertices
) {
3350 _mesa_glsl_error(&loc
, state
,
3351 "%s size contradicts previously declared layout "
3352 "(size is %u, but layout requires a size of %u)",
3353 var_category
, var
->type
->length
, num_vertices
);
3354 } else if (*size
!= 0 && var
->type
->length
!= *size
) {
3355 _mesa_glsl_error(&loc
, state
,
3356 "%s sizes are inconsistent (size is %u, but a "
3357 "previous declaration has size %u)",
3358 var_category
, var
->type
->length
, *size
);
3360 *size
= var
->type
->length
;
3366 handle_tess_ctrl_shader_output_decl(struct _mesa_glsl_parse_state
*state
,
3367 YYLTYPE loc
, ir_variable
*var
)
3369 unsigned num_vertices
= 0;
3371 if (state
->tcs_output_vertices_specified
) {
3372 num_vertices
= state
->out_qualifier
->vertices
;
3375 if (!var
->type
->is_array() && !var
->data
.patch
) {
3376 _mesa_glsl_error(&loc
, state
,
3377 "tessellation control shader outputs must be arrays");
3379 /* To avoid cascading failures, short circuit the checks below. */
3383 if (var
->data
.patch
)
3386 validate_layout_qualifier_vertex_count(state
, loc
, var
, num_vertices
,
3387 &state
->tcs_output_size
,
3388 "tessellation control shader output");
3392 * Do additional processing necessary for tessellation control/evaluation shader
3393 * input declarations. This covers both interface block arrays and bare input
3397 handle_tess_shader_input_decl(struct _mesa_glsl_parse_state
*state
,
3398 YYLTYPE loc
, ir_variable
*var
)
3400 if (!var
->type
->is_array() && !var
->data
.patch
) {
3401 _mesa_glsl_error(&loc
, state
,
3402 "per-vertex tessellation shader inputs must be arrays");
3403 /* Avoid cascading failures. */
3407 if (var
->data
.patch
)
3410 /* Unsized arrays are implicitly sized to gl_MaxPatchVertices. */
3411 if (var
->type
->is_unsized_array()) {
3412 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
3413 state
->Const
.MaxPatchVertices
);
3419 * Do additional processing necessary for geometry shader input declarations
3420 * (this covers both interface blocks arrays and bare input variables).
3423 handle_geometry_shader_input_decl(struct _mesa_glsl_parse_state
*state
,
3424 YYLTYPE loc
, ir_variable
*var
)
3426 unsigned num_vertices
= 0;
3428 if (state
->gs_input_prim_type_specified
) {
3429 num_vertices
= vertices_per_prim(state
->in_qualifier
->prim_type
);
3432 /* Geometry shader input variables must be arrays. Caller should have
3433 * reported an error for this.
3435 if (!var
->type
->is_array()) {
3436 assert(state
->error
);
3438 /* To avoid cascading failures, short circuit the checks below. */
3442 validate_layout_qualifier_vertex_count(state
, loc
, var
, num_vertices
,
3443 &state
->gs_input_size
,
3444 "geometry shader input");
3448 validate_identifier(const char *identifier
, YYLTYPE loc
,
3449 struct _mesa_glsl_parse_state
*state
)
3451 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
3453 * "Identifiers starting with "gl_" are reserved for use by
3454 * OpenGL, and may not be declared in a shader as either a
3455 * variable or a function."
3457 if (is_gl_identifier(identifier
)) {
3458 _mesa_glsl_error(&loc
, state
,
3459 "identifier `%s' uses reserved `gl_' prefix",
3461 } else if (strstr(identifier
, "__")) {
3462 /* From page 14 (page 20 of the PDF) of the GLSL 1.10
3465 * "In addition, all identifiers containing two
3466 * consecutive underscores (__) are reserved as
3467 * possible future keywords."
3469 * The intention is that names containing __ are reserved for internal
3470 * use by the implementation, and names prefixed with GL_ are reserved
3471 * for use by Khronos. Names simply containing __ are dangerous to use,
3472 * but should be allowed.
3474 * A future version of the GLSL specification will clarify this.
3476 _mesa_glsl_warning(&loc
, state
,
3477 "identifier `%s' uses reserved `__' string",
3483 precision_qualifier_allowed(const glsl_type
*type
)
3485 /* Precision qualifiers apply to floating point, integer and opaque
3488 * Section 4.5.2 (Precision Qualifiers) of the GLSL 1.30 spec says:
3489 * "Any floating point or any integer declaration can have the type
3490 * preceded by one of these precision qualifiers [...] Literal
3491 * constants do not have precision qualifiers. Neither do Boolean
3494 * Section 4.5 (Precision and Precision Qualifiers) of the GLSL 1.30
3497 * "Precision qualifiers are added for code portability with OpenGL
3498 * ES, not for functionality. They have the same syntax as in OpenGL
3501 * Section 8 (Built-In Functions) of the GLSL ES 1.00 spec says:
3503 * "uniform lowp sampler2D sampler;
3506 * lowp vec4 col = texture2D (sampler, coord);
3507 * // texture2D returns lowp"
3509 * From this, we infer that GLSL 1.30 (and later) should allow precision
3510 * qualifiers on sampler types just like float and integer types.
3512 return type
->is_float()
3513 || type
->is_integer()
3514 || type
->is_record()
3515 || type
->contains_opaque();
3519 ast_declarator_list::hir(exec_list
*instructions
,
3520 struct _mesa_glsl_parse_state
*state
)
3523 const struct glsl_type
*decl_type
;
3524 const char *type_name
= NULL
;
3525 ir_rvalue
*result
= NULL
;
3526 YYLTYPE loc
= this->get_location();
3528 /* From page 46 (page 52 of the PDF) of the GLSL 1.50 spec:
3530 * "To ensure that a particular output variable is invariant, it is
3531 * necessary to use the invariant qualifier. It can either be used to
3532 * qualify a previously declared variable as being invariant
3534 * invariant gl_Position; // make existing gl_Position be invariant"
3536 * In these cases the parser will set the 'invariant' flag in the declarator
3537 * list, and the type will be NULL.
3539 if (this->invariant
) {
3540 assert(this->type
== NULL
);
3542 if (state
->current_function
!= NULL
) {
3543 _mesa_glsl_error(& loc
, state
,
3544 "all uses of `invariant' keyword must be at global "
3548 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
3549 assert(decl
->array_specifier
== NULL
);
3550 assert(decl
->initializer
== NULL
);
3552 ir_variable
*const earlier
=
3553 state
->symbols
->get_variable(decl
->identifier
);
3554 if (earlier
== NULL
) {
3555 _mesa_glsl_error(& loc
, state
,
3556 "undeclared variable `%s' cannot be marked "
3557 "invariant", decl
->identifier
);
3558 } else if (!is_varying_var(earlier
, state
->stage
)) {
3559 _mesa_glsl_error(&loc
, state
,
3560 "`%s' cannot be marked invariant; interfaces between "
3561 "shader stages only.", decl
->identifier
);
3562 } else if (earlier
->data
.used
) {
3563 _mesa_glsl_error(& loc
, state
,
3564 "variable `%s' may not be redeclared "
3565 "`invariant' after being used",
3568 earlier
->data
.invariant
= true;
3572 /* Invariant redeclarations do not have r-values.
3577 if (this->precise
) {
3578 assert(this->type
== NULL
);
3580 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
3581 assert(decl
->array_specifier
== NULL
);
3582 assert(decl
->initializer
== NULL
);
3584 ir_variable
*const earlier
=
3585 state
->symbols
->get_variable(decl
->identifier
);
3586 if (earlier
== NULL
) {
3587 _mesa_glsl_error(& loc
, state
,
3588 "undeclared variable `%s' cannot be marked "
3589 "precise", decl
->identifier
);
3590 } else if (state
->current_function
!= NULL
&&
3591 !state
->symbols
->name_declared_this_scope(decl
->identifier
)) {
3592 /* Note: we have to check if we're in a function, since
3593 * builtins are treated as having come from another scope.
3595 _mesa_glsl_error(& loc
, state
,
3596 "variable `%s' from an outer scope may not be "
3597 "redeclared `precise' in this scope",
3599 } else if (earlier
->data
.used
) {
3600 _mesa_glsl_error(& loc
, state
,
3601 "variable `%s' may not be redeclared "
3602 "`precise' after being used",
3605 earlier
->data
.precise
= true;
3609 /* Precise redeclarations do not have r-values either. */
3613 assert(this->type
!= NULL
);
3614 assert(!this->invariant
);
3615 assert(!this->precise
);
3617 /* The type specifier may contain a structure definition. Process that
3618 * before any of the variable declarations.
3620 (void) this->type
->specifier
->hir(instructions
, state
);
3622 decl_type
= this->type
->glsl_type(& type_name
, state
);
3624 /* Section 4.3.7 "Buffer Variables" of the GLSL 4.30 spec:
3625 * "Buffer variables may only be declared inside interface blocks
3626 * (section 4.3.9 “Interface Blocks”), which are then referred to as
3627 * shader storage blocks. It is a compile-time error to declare buffer
3628 * variables at global scope (outside a block)."
3630 if (type
->qualifier
.flags
.q
.buffer
&& !decl_type
->is_interface()) {
3631 _mesa_glsl_error(&loc
, state
,
3632 "buffer variables cannot be declared outside "
3633 "interface blocks");
3636 /* An offset-qualified atomic counter declaration sets the default
3637 * offset for the next declaration within the same atomic counter
3640 if (decl_type
&& decl_type
->contains_atomic()) {
3641 if (type
->qualifier
.flags
.q
.explicit_binding
&&
3642 type
->qualifier
.flags
.q
.explicit_offset
)
3643 state
->atomic_counter_offsets
[type
->qualifier
.binding
] =
3644 type
->qualifier
.offset
;
3647 if (this->declarations
.is_empty()) {
3648 /* If there is no structure involved in the program text, there are two
3649 * possible scenarios:
3651 * - The program text contained something like 'vec4;'. This is an
3652 * empty declaration. It is valid but weird. Emit a warning.
3654 * - The program text contained something like 'S;' and 'S' is not the
3655 * name of a known structure type. This is both invalid and weird.
3658 * - The program text contained something like 'mediump float;'
3659 * when the programmer probably meant 'precision mediump
3660 * float;' Emit a warning with a description of what they
3661 * probably meant to do.
3663 * Note that if decl_type is NULL and there is a structure involved,
3664 * there must have been some sort of error with the structure. In this
3665 * case we assume that an error was already generated on this line of
3666 * code for the structure. There is no need to generate an additional,
3669 assert(this->type
->specifier
->structure
== NULL
|| decl_type
!= NULL
3672 if (decl_type
== NULL
) {
3673 _mesa_glsl_error(&loc
, state
,
3674 "invalid type `%s' in empty declaration",
3676 } else if (decl_type
->base_type
== GLSL_TYPE_ATOMIC_UINT
) {
3677 /* Empty atomic counter declarations are allowed and useful
3678 * to set the default offset qualifier.
3681 } else if (this->type
->qualifier
.precision
!= ast_precision_none
) {
3682 if (this->type
->specifier
->structure
!= NULL
) {
3683 _mesa_glsl_error(&loc
, state
,
3684 "precision qualifiers can't be applied "
3687 static const char *const precision_names
[] = {
3694 _mesa_glsl_warning(&loc
, state
,
3695 "empty declaration with precision qualifier, "
3696 "to set the default precision, use "
3697 "`precision %s %s;'",
3698 precision_names
[this->type
->qualifier
.precision
],
3701 } else if (this->type
->specifier
->structure
== NULL
) {
3702 _mesa_glsl_warning(&loc
, state
, "empty declaration");
3706 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
3707 const struct glsl_type
*var_type
;
3709 const char *identifier
= decl
->identifier
;
3710 /* FINISHME: Emit a warning if a variable declaration shadows a
3711 * FINISHME: declaration at a higher scope.
3714 if ((decl_type
== NULL
) || decl_type
->is_void()) {
3715 if (type_name
!= NULL
) {
3716 _mesa_glsl_error(& loc
, state
,
3717 "invalid type `%s' in declaration of `%s'",
3718 type_name
, decl
->identifier
);
3720 _mesa_glsl_error(& loc
, state
,
3721 "invalid type in declaration of `%s'",
3727 if (this->type
->qualifier
.flags
.q
.subroutine
) {
3731 t
= state
->symbols
->get_type(this->type
->specifier
->type_name
);
3733 _mesa_glsl_error(& loc
, state
,
3734 "invalid type in declaration of `%s'",
3736 name
= ralloc_asprintf(ctx
, "%s_%s", _mesa_shader_stage_to_subroutine_prefix(state
->stage
), decl
->identifier
);
3741 var_type
= process_array_type(&loc
, decl_type
, decl
->array_specifier
,
3744 var
= new(ctx
) ir_variable(var_type
, identifier
, ir_var_auto
);
3746 /* The 'varying in' and 'varying out' qualifiers can only be used with
3747 * ARB_geometry_shader4 and EXT_geometry_shader4, which we don't support
3750 if (this->type
->qualifier
.flags
.q
.varying
) {
3751 if (this->type
->qualifier
.flags
.q
.in
) {
3752 _mesa_glsl_error(& loc
, state
,
3753 "`varying in' qualifier in declaration of "
3754 "`%s' only valid for geometry shaders using "
3755 "ARB_geometry_shader4 or EXT_geometry_shader4",
3757 } else if (this->type
->qualifier
.flags
.q
.out
) {
3758 _mesa_glsl_error(& loc
, state
,
3759 "`varying out' qualifier in declaration of "
3760 "`%s' only valid for geometry shaders using "
3761 "ARB_geometry_shader4 or EXT_geometry_shader4",
3766 /* From page 22 (page 28 of the PDF) of the GLSL 1.10 specification;
3768 * "Global variables can only use the qualifiers const,
3769 * attribute, uniform, or varying. Only one may be
3772 * Local variables can only use the qualifier const."
3774 * This is relaxed in GLSL 1.30 and GLSL ES 3.00. It is also relaxed by
3775 * any extension that adds the 'layout' keyword.
3777 if (!state
->is_version(130, 300)
3778 && !state
->has_explicit_attrib_location()
3779 && !state
->has_separate_shader_objects()
3780 && !state
->ARB_fragment_coord_conventions_enable
) {
3781 if (this->type
->qualifier
.flags
.q
.out
) {
3782 _mesa_glsl_error(& loc
, state
,
3783 "`out' qualifier in declaration of `%s' "
3784 "only valid for function parameters in %s",
3785 decl
->identifier
, state
->get_version_string());
3787 if (this->type
->qualifier
.flags
.q
.in
) {
3788 _mesa_glsl_error(& loc
, state
,
3789 "`in' qualifier in declaration of `%s' "
3790 "only valid for function parameters in %s",
3791 decl
->identifier
, state
->get_version_string());
3793 /* FINISHME: Test for other invalid qualifiers. */
3796 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
,
3799 if (this->type
->qualifier
.flags
.q
.invariant
) {
3800 if (!is_varying_var(var
, state
->stage
)) {
3801 _mesa_glsl_error(&loc
, state
,
3802 "`%s' cannot be marked invariant; interfaces between "
3803 "shader stages only", var
->name
);
3807 if (state
->current_function
!= NULL
) {
3808 const char *mode
= NULL
;
3809 const char *extra
= "";
3811 /* There is no need to check for 'inout' here because the parser will
3812 * only allow that in function parameter lists.
3814 if (this->type
->qualifier
.flags
.q
.attribute
) {
3816 } else if (this->type
->qualifier
.flags
.q
.subroutine
) {
3817 mode
= "subroutine uniform";
3818 } else if (this->type
->qualifier
.flags
.q
.uniform
) {
3820 } else if (this->type
->qualifier
.flags
.q
.varying
) {
3822 } else if (this->type
->qualifier
.flags
.q
.in
) {
3824 extra
= " or in function parameter list";
3825 } else if (this->type
->qualifier
.flags
.q
.out
) {
3827 extra
= " or in function parameter list";
3831 _mesa_glsl_error(& loc
, state
,
3832 "%s variable `%s' must be declared at "
3834 mode
, var
->name
, extra
);
3836 } else if (var
->data
.mode
== ir_var_shader_in
) {
3837 var
->data
.read_only
= true;
3839 if (state
->stage
== MESA_SHADER_VERTEX
) {
3840 bool error_emitted
= false;
3842 /* From page 31 (page 37 of the PDF) of the GLSL 1.50 spec:
3844 * "Vertex shader inputs can only be float, floating-point
3845 * vectors, matrices, signed and unsigned integers and integer
3846 * vectors. Vertex shader inputs can also form arrays of these
3847 * types, but not structures."
3849 * From page 31 (page 27 of the PDF) of the GLSL 1.30 spec:
3851 * "Vertex shader inputs can only be float, floating-point
3852 * vectors, matrices, signed and unsigned integers and integer
3853 * vectors. They cannot be arrays or structures."
3855 * From page 23 (page 29 of the PDF) of the GLSL 1.20 spec:
3857 * "The attribute qualifier can be used only with float,
3858 * floating-point vectors, and matrices. Attribute variables
3859 * cannot be declared as arrays or structures."
3861 * From page 33 (page 39 of the PDF) of the GLSL ES 3.00 spec:
3863 * "Vertex shader inputs can only be float, floating-point
3864 * vectors, matrices, signed and unsigned integers and integer
3865 * vectors. Vertex shader inputs cannot be arrays or
3868 const glsl_type
*check_type
= var
->type
->without_array();
3870 switch (check_type
->base_type
) {
3871 case GLSL_TYPE_FLOAT
:
3873 case GLSL_TYPE_UINT
:
3875 if (state
->is_version(120, 300))
3877 case GLSL_TYPE_DOUBLE
:
3878 if (check_type
->base_type
== GLSL_TYPE_DOUBLE
&& (state
->is_version(410, 0) || state
->ARB_vertex_attrib_64bit_enable
))
3882 _mesa_glsl_error(& loc
, state
,
3883 "vertex shader input / attribute cannot have "
3885 var
->type
->is_array() ? "array of " : "",
3887 error_emitted
= true;
3890 if (!error_emitted
&& var
->type
->is_array() &&
3891 !state
->check_version(150, 0, &loc
,
3892 "vertex shader input / attribute "
3893 "cannot have array type")) {
3894 error_emitted
= true;
3896 } else if (state
->stage
== MESA_SHADER_GEOMETRY
) {
3897 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
3899 * Geometry shader input variables get the per-vertex values
3900 * written out by vertex shader output variables of the same
3901 * names. Since a geometry shader operates on a set of
3902 * vertices, each input varying variable (or input block, see
3903 * interface blocks below) needs to be declared as an array.
3905 if (!var
->type
->is_array()) {
3906 _mesa_glsl_error(&loc
, state
,
3907 "geometry shader inputs must be arrays");
3910 handle_geometry_shader_input_decl(state
, loc
, var
);
3911 } else if (state
->stage
== MESA_SHADER_FRAGMENT
) {
3912 /* From section 4.3.4 (Input Variables) of the GLSL ES 3.10 spec:
3914 * It is a compile-time error to declare a fragment shader
3915 * input with, or that contains, any of the following types:
3919 * * An array of arrays
3920 * * An array of structures
3921 * * A structure containing an array
3922 * * A structure containing a structure
3924 if (state
->es_shader
) {
3925 const glsl_type
*check_type
= var
->type
->without_array();
3926 if (check_type
->is_boolean() ||
3927 check_type
->contains_opaque()) {
3928 _mesa_glsl_error(&loc
, state
,
3929 "fragment shader input cannot have type %s",
3932 if (var
->type
->is_array() &&
3933 var
->type
->fields
.array
->is_array()) {
3934 _mesa_glsl_error(&loc
, state
,
3936 "cannot have an array of arrays",
3937 _mesa_shader_stage_to_string(state
->stage
));
3939 if (var
->type
->is_array() &&
3940 var
->type
->fields
.array
->is_record()) {
3941 _mesa_glsl_error(&loc
, state
,
3942 "fragment shader input "
3943 "cannot have an array of structs");
3945 if (var
->type
->is_record()) {
3946 for (unsigned i
= 0; i
< var
->type
->length
; i
++) {
3947 if (var
->type
->fields
.structure
[i
].type
->is_array() ||
3948 var
->type
->fields
.structure
[i
].type
->is_record())
3949 _mesa_glsl_error(&loc
, state
,
3950 "fragement shader input cannot have "
3951 "a struct that contains an "
3956 } else if (state
->stage
== MESA_SHADER_TESS_CTRL
||
3957 state
->stage
== MESA_SHADER_TESS_EVAL
) {
3958 handle_tess_shader_input_decl(state
, loc
, var
);
3960 } else if (var
->data
.mode
== ir_var_shader_out
) {
3961 const glsl_type
*check_type
= var
->type
->without_array();
3963 /* From section 4.3.6 (Output variables) of the GLSL 4.40 spec:
3965 * It is a compile-time error to declare a vertex, tessellation
3966 * evaluation, tessellation control, or geometry shader output
3967 * that contains any of the following:
3969 * * A Boolean type (bool, bvec2 ...)
3972 if (check_type
->is_boolean() || check_type
->contains_opaque())
3973 _mesa_glsl_error(&loc
, state
,
3974 "%s shader output cannot have type %s",
3975 _mesa_shader_stage_to_string(state
->stage
),
3978 /* From section 4.3.6 (Output variables) of the GLSL 4.40 spec:
3980 * It is a compile-time error to declare a fragment shader output
3981 * that contains any of the following:
3983 * * A Boolean type (bool, bvec2 ...)
3984 * * A double-precision scalar or vector (double, dvec2 ...)
3989 if (state
->stage
== MESA_SHADER_FRAGMENT
) {
3990 if (check_type
->is_record() || check_type
->is_matrix())
3991 _mesa_glsl_error(&loc
, state
,
3992 "fragment shader output "
3993 "cannot have struct or matrix type");
3994 switch (check_type
->base_type
) {
3995 case GLSL_TYPE_UINT
:
3997 case GLSL_TYPE_FLOAT
:
4000 _mesa_glsl_error(&loc
, state
,
4001 "fragment shader output cannot have "
4002 "type %s", check_type
->name
);
4006 /* From section 4.3.6 (Output Variables) of the GLSL ES 3.10 spec:
4008 * It is a compile-time error to declare a vertex shader output
4009 * with, or that contains, any of the following types:
4013 * * An array of arrays
4014 * * An array of structures
4015 * * A structure containing an array
4016 * * A structure containing a structure
4018 * It is a compile-time error to declare a fragment shader output
4019 * with, or that contains, any of the following types:
4025 * * An array of array
4027 if (state
->es_shader
) {
4028 if (var
->type
->is_array() &&
4029 var
->type
->fields
.array
->is_array()) {
4030 _mesa_glsl_error(&loc
, state
,
4032 "cannot have an array of arrays",
4033 _mesa_shader_stage_to_string(state
->stage
));
4035 if (state
->stage
== MESA_SHADER_VERTEX
) {
4036 if (var
->type
->is_array() &&
4037 var
->type
->fields
.array
->is_record()) {
4038 _mesa_glsl_error(&loc
, state
,
4039 "vertex shader output "
4040 "cannot have an array of structs");
4042 if (var
->type
->is_record()) {
4043 for (unsigned i
= 0; i
< var
->type
->length
; i
++) {
4044 if (var
->type
->fields
.structure
[i
].type
->is_array() ||
4045 var
->type
->fields
.structure
[i
].type
->is_record())
4046 _mesa_glsl_error(&loc
, state
,
4047 "vertex shader output cannot have a "
4048 "struct that contains an "
4055 if (state
->stage
== MESA_SHADER_TESS_CTRL
) {
4056 handle_tess_ctrl_shader_output_decl(state
, loc
, var
);
4058 } else if (var
->type
->contains_subroutine()) {
4059 /* declare subroutine uniforms as hidden */
4060 var
->data
.how_declared
= ir_var_hidden
;
4063 /* Integer fragment inputs must be qualified with 'flat'. In GLSL ES,
4064 * so must integer vertex outputs.
4066 * From section 4.3.4 ("Inputs") of the GLSL 1.50 spec:
4067 * "Fragment shader inputs that are signed or unsigned integers or
4068 * integer vectors must be qualified with the interpolation qualifier
4071 * From section 4.3.4 ("Input Variables") of the GLSL 3.00 ES spec:
4072 * "Fragment shader inputs that are, or contain, signed or unsigned
4073 * integers or integer vectors must be qualified with the
4074 * interpolation qualifier flat."
4076 * From section 4.3.6 ("Output Variables") of the GLSL 3.00 ES spec:
4077 * "Vertex shader outputs that are, or contain, signed or unsigned
4078 * integers or integer vectors must be qualified with the
4079 * interpolation qualifier flat."
4081 * Note that prior to GLSL 1.50, this requirement applied to vertex
4082 * outputs rather than fragment inputs. That creates problems in the
4083 * presence of geometry shaders, so we adopt the GLSL 1.50 rule for all
4084 * desktop GL shaders. For GLSL ES shaders, we follow the spec and
4085 * apply the restriction to both vertex outputs and fragment inputs.
4087 * Note also that the desktop GLSL specs are missing the text "or
4088 * contain"; this is presumably an oversight, since there is no
4089 * reasonable way to interpolate a fragment shader input that contains
4092 if (state
->is_version(130, 300) &&
4093 var
->type
->contains_integer() &&
4094 var
->data
.interpolation
!= INTERP_QUALIFIER_FLAT
&&
4095 ((state
->stage
== MESA_SHADER_FRAGMENT
&& var
->data
.mode
== ir_var_shader_in
)
4096 || (state
->stage
== MESA_SHADER_VERTEX
&& var
->data
.mode
== ir_var_shader_out
4097 && state
->es_shader
))) {
4098 const char *var_type
= (state
->stage
== MESA_SHADER_VERTEX
) ?
4099 "vertex output" : "fragment input";
4100 _mesa_glsl_error(&loc
, state
, "if a %s is (or contains) "
4101 "an integer, then it must be qualified with 'flat'",
4105 /* Double fragment inputs must be qualified with 'flat'. */
4106 if (var
->type
->contains_double() &&
4107 var
->data
.interpolation
!= INTERP_QUALIFIER_FLAT
&&
4108 state
->stage
== MESA_SHADER_FRAGMENT
&&
4109 var
->data
.mode
== ir_var_shader_in
) {
4110 _mesa_glsl_error(&loc
, state
, "if a fragment input is (or contains) "
4111 "a double, then it must be qualified with 'flat'",
4115 /* Interpolation qualifiers cannot be applied to 'centroid' and
4116 * 'centroid varying'.
4118 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
4119 * "interpolation qualifiers may only precede the qualifiers in,
4120 * centroid in, out, or centroid out in a declaration. They do not apply
4121 * to the deprecated storage qualifiers varying or centroid varying."
4123 * These deprecated storage qualifiers do not exist in GLSL ES 3.00.
4125 if (state
->is_version(130, 0)
4126 && this->type
->qualifier
.has_interpolation()
4127 && this->type
->qualifier
.flags
.q
.varying
) {
4129 const char *i
= this->type
->qualifier
.interpolation_string();
4132 if (this->type
->qualifier
.flags
.q
.centroid
)
4133 s
= "centroid varying";
4137 _mesa_glsl_error(&loc
, state
,
4138 "qualifier '%s' cannot be applied to the "
4139 "deprecated storage qualifier '%s'", i
, s
);
4143 /* Interpolation qualifiers can only apply to vertex shader outputs and
4144 * fragment shader inputs.
4146 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
4147 * "Outputs from a vertex shader (out) and inputs to a fragment
4148 * shader (in) can be further qualified with one or more of these
4149 * interpolation qualifiers"
4151 * From page 31 (page 37 of the PDF) of the GLSL ES 3.00 spec:
4152 * "These interpolation qualifiers may only precede the qualifiers
4153 * in, centroid in, out, or centroid out in a declaration. They do
4154 * not apply to inputs into a vertex shader or outputs from a
4157 if (state
->is_version(130, 300)
4158 && this->type
->qualifier
.has_interpolation()) {
4160 const char *i
= this->type
->qualifier
.interpolation_string();
4163 switch (state
->stage
) {
4164 case MESA_SHADER_VERTEX
:
4165 if (this->type
->qualifier
.flags
.q
.in
) {
4166 _mesa_glsl_error(&loc
, state
,
4167 "qualifier '%s' cannot be applied to vertex "
4168 "shader inputs", i
);
4171 case MESA_SHADER_FRAGMENT
:
4172 if (this->type
->qualifier
.flags
.q
.out
) {
4173 _mesa_glsl_error(&loc
, state
,
4174 "qualifier '%s' cannot be applied to fragment "
4175 "shader outputs", i
);
4184 /* From section 4.3.4 of the GLSL 4.00 spec:
4185 * "Input variables may not be declared using the patch in qualifier
4186 * in tessellation control or geometry shaders."
4188 * From section 4.3.6 of the GLSL 4.00 spec:
4189 * "It is an error to use patch out in a vertex, tessellation
4190 * evaluation, or geometry shader."
4192 * This doesn't explicitly forbid using them in a fragment shader, but
4193 * that's probably just an oversight.
4195 if (state
->stage
!= MESA_SHADER_TESS_EVAL
4196 && this->type
->qualifier
.flags
.q
.patch
4197 && this->type
->qualifier
.flags
.q
.in
) {
4199 _mesa_glsl_error(&loc
, state
, "'patch in' can only be used in a "
4200 "tessellation evaluation shader");
4203 if (state
->stage
!= MESA_SHADER_TESS_CTRL
4204 && this->type
->qualifier
.flags
.q
.patch
4205 && this->type
->qualifier
.flags
.q
.out
) {
4207 _mesa_glsl_error(&loc
, state
, "'patch out' can only be used in a "
4208 "tessellation control shader");
4211 /* Precision qualifiers exists only in GLSL versions 1.00 and >= 1.30.
4213 if (this->type
->qualifier
.precision
!= ast_precision_none
) {
4214 state
->check_precision_qualifiers_allowed(&loc
);
4218 /* If a precision qualifier is allowed on a type, it is allowed on
4219 * an array of that type.
4221 if (!(this->type
->qualifier
.precision
== ast_precision_none
4222 || precision_qualifier_allowed(var
->type
->without_array()))) {
4224 _mesa_glsl_error(&loc
, state
,
4225 "precision qualifiers apply only to floating point"
4226 ", integer and opaque types");
4229 /* From section 4.1.7 of the GLSL 4.40 spec:
4231 * "[Opaque types] can only be declared as function
4232 * parameters or uniform-qualified variables."
4234 if (var_type
->contains_opaque() &&
4235 !this->type
->qualifier
.flags
.q
.uniform
) {
4236 _mesa_glsl_error(&loc
, state
,
4237 "opaque variables must be declared uniform");
4240 /* Process the initializer and add its instructions to a temporary
4241 * list. This list will be added to the instruction stream (below) after
4242 * the declaration is added. This is done because in some cases (such as
4243 * redeclarations) the declaration may not actually be added to the
4244 * instruction stream.
4246 exec_list initializer_instructions
;
4248 /* Examine var name here since var may get deleted in the next call */
4249 bool var_is_gl_id
= is_gl_identifier(var
->name
);
4251 ir_variable
*earlier
=
4252 get_variable_being_redeclared(var
, decl
->get_location(), state
,
4253 false /* allow_all_redeclarations */);
4254 if (earlier
!= NULL
) {
4256 earlier
->data
.how_declared
== ir_var_declared_in_block
) {
4257 _mesa_glsl_error(&loc
, state
,
4258 "`%s' has already been redeclared using "
4259 "gl_PerVertex", earlier
->name
);
4261 earlier
->data
.how_declared
= ir_var_declared_normally
;
4264 if (decl
->initializer
!= NULL
) {
4265 result
= process_initializer((earlier
== NULL
) ? var
: earlier
,
4267 &initializer_instructions
, state
);
4270 /* From page 23 (page 29 of the PDF) of the GLSL 1.10 spec:
4272 * "It is an error to write to a const variable outside of
4273 * its declaration, so they must be initialized when
4276 if (this->type
->qualifier
.flags
.q
.constant
&& decl
->initializer
== NULL
) {
4277 _mesa_glsl_error(& loc
, state
,
4278 "const declaration of `%s' must be initialized",
4282 if (state
->es_shader
) {
4283 const glsl_type
*const t
= (earlier
== NULL
)
4284 ? var
->type
: earlier
->type
;
4286 if (t
->is_unsized_array())
4287 /* Section 10.17 of the GLSL ES 1.00 specification states that
4288 * unsized array declarations have been removed from the language.
4289 * Arrays that are sized using an initializer are still explicitly
4290 * sized. However, GLSL ES 1.00 does not allow array
4291 * initializers. That is only allowed in GLSL ES 3.00.
4293 * Section 4.1.9 (Arrays) of the GLSL ES 3.00 spec says:
4295 * "An array type can also be formed without specifying a size
4296 * if the definition includes an initializer:
4298 * float x[] = float[2] (1.0, 2.0); // declares an array of size 2
4299 * float y[] = float[] (1.0, 2.0, 3.0); // declares an array of size 3
4304 _mesa_glsl_error(& loc
, state
,
4305 "unsized array declarations are not allowed in "
4309 /* If the declaration is not a redeclaration, there are a few additional
4310 * semantic checks that must be applied. In addition, variable that was
4311 * created for the declaration should be added to the IR stream.
4313 if (earlier
== NULL
) {
4314 validate_identifier(decl
->identifier
, loc
, state
);
4316 /* Add the variable to the symbol table. Note that the initializer's
4317 * IR was already processed earlier (though it hasn't been emitted
4318 * yet), without the variable in scope.
4320 * This differs from most C-like languages, but it follows the GLSL
4321 * specification. From page 28 (page 34 of the PDF) of the GLSL 1.50
4324 * "Within a declaration, the scope of a name starts immediately
4325 * after the initializer if present or immediately after the name
4326 * being declared if not."
4328 if (!state
->symbols
->add_variable(var
)) {
4329 YYLTYPE loc
= this->get_location();
4330 _mesa_glsl_error(&loc
, state
, "name `%s' already taken in the "
4331 "current scope", decl
->identifier
);
4335 /* Push the variable declaration to the top. It means that all the
4336 * variable declarations will appear in a funny last-to-first order,
4337 * but otherwise we run into trouble if a function is prototyped, a
4338 * global var is decled, then the function is defined with usage of
4339 * the global var. See glslparsertest's CorrectModule.frag.
4341 instructions
->push_head(var
);
4344 instructions
->append_list(&initializer_instructions
);
4348 /* Generally, variable declarations do not have r-values. However,
4349 * one is used for the declaration in
4351 * while (bool b = some_condition()) {
4355 * so we return the rvalue from the last seen declaration here.
4362 ast_parameter_declarator::hir(exec_list
*instructions
,
4363 struct _mesa_glsl_parse_state
*state
)
4366 const struct glsl_type
*type
;
4367 const char *name
= NULL
;
4368 YYLTYPE loc
= this->get_location();
4370 type
= this->type
->glsl_type(& name
, state
);
4374 _mesa_glsl_error(& loc
, state
,
4375 "invalid type `%s' in declaration of `%s'",
4376 name
, this->identifier
);
4378 _mesa_glsl_error(& loc
, state
,
4379 "invalid type in declaration of `%s'",
4383 type
= glsl_type::error_type
;
4386 /* From page 62 (page 68 of the PDF) of the GLSL 1.50 spec:
4388 * "Functions that accept no input arguments need not use void in the
4389 * argument list because prototypes (or definitions) are required and
4390 * therefore there is no ambiguity when an empty argument list "( )" is
4391 * declared. The idiom "(void)" as a parameter list is provided for
4394 * Placing this check here prevents a void parameter being set up
4395 * for a function, which avoids tripping up checks for main taking
4396 * parameters and lookups of an unnamed symbol.
4398 if (type
->is_void()) {
4399 if (this->identifier
!= NULL
)
4400 _mesa_glsl_error(& loc
, state
,
4401 "named parameter cannot have type `void'");
4407 if (formal_parameter
&& (this->identifier
== NULL
)) {
4408 _mesa_glsl_error(& loc
, state
, "formal parameter lacks a name");
4412 /* This only handles "vec4 foo[..]". The earlier specifier->glsl_type(...)
4413 * call already handled the "vec4[..] foo" case.
4415 type
= process_array_type(&loc
, type
, this->array_specifier
, state
);
4417 if (!type
->is_error() && type
->is_unsized_array()) {
4418 _mesa_glsl_error(&loc
, state
, "arrays passed as parameters must have "
4420 type
= glsl_type::error_type
;
4424 ir_variable
*var
= new(ctx
)
4425 ir_variable(type
, this->identifier
, ir_var_function_in
);
4427 /* Apply any specified qualifiers to the parameter declaration. Note that
4428 * for function parameters the default mode is 'in'.
4430 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
, & loc
,
4433 /* From section 4.1.7 of the GLSL 4.40 spec:
4435 * "Opaque variables cannot be treated as l-values; hence cannot
4436 * be used as out or inout function parameters, nor can they be
4439 if ((var
->data
.mode
== ir_var_function_inout
|| var
->data
.mode
== ir_var_function_out
)
4440 && type
->contains_opaque()) {
4441 _mesa_glsl_error(&loc
, state
, "out and inout parameters cannot "
4442 "contain opaque variables");
4443 type
= glsl_type::error_type
;
4446 /* From page 39 (page 45 of the PDF) of the GLSL 1.10 spec:
4448 * "When calling a function, expressions that do not evaluate to
4449 * l-values cannot be passed to parameters declared as out or inout."
4451 * From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
4453 * "Other binary or unary expressions, non-dereferenced arrays,
4454 * function names, swizzles with repeated fields, and constants
4455 * cannot be l-values."
4457 * So for GLSL 1.10, passing an array as an out or inout parameter is not
4458 * allowed. This restriction is removed in GLSL 1.20, and in GLSL ES.
4460 if ((var
->data
.mode
== ir_var_function_inout
|| var
->data
.mode
== ir_var_function_out
)
4462 && !state
->check_version(120, 100, &loc
,
4463 "arrays cannot be out or inout parameters")) {
4464 type
= glsl_type::error_type
;
4467 instructions
->push_tail(var
);
4469 /* Parameter declarations do not have r-values.
4476 ast_parameter_declarator::parameters_to_hir(exec_list
*ast_parameters
,
4478 exec_list
*ir_parameters
,
4479 _mesa_glsl_parse_state
*state
)
4481 ast_parameter_declarator
*void_param
= NULL
;
4484 foreach_list_typed (ast_parameter_declarator
, param
, link
, ast_parameters
) {
4485 param
->formal_parameter
= formal
;
4486 param
->hir(ir_parameters
, state
);
4494 if ((void_param
!= NULL
) && (count
> 1)) {
4495 YYLTYPE loc
= void_param
->get_location();
4497 _mesa_glsl_error(& loc
, state
,
4498 "`void' parameter must be only parameter");
4504 emit_function(_mesa_glsl_parse_state
*state
, ir_function
*f
)
4506 /* IR invariants disallow function declarations or definitions
4507 * nested within other function definitions. But there is no
4508 * requirement about the relative order of function declarations
4509 * and definitions with respect to one another. So simply insert
4510 * the new ir_function block at the end of the toplevel instruction
4513 state
->toplevel_ir
->push_tail(f
);
4518 ast_function::hir(exec_list
*instructions
,
4519 struct _mesa_glsl_parse_state
*state
)
4522 ir_function
*f
= NULL
;
4523 ir_function_signature
*sig
= NULL
;
4524 exec_list hir_parameters
;
4525 YYLTYPE loc
= this->get_location();
4527 const char *const name
= identifier
;
4529 /* New functions are always added to the top-level IR instruction stream,
4530 * so this instruction list pointer is ignored. See also emit_function
4533 (void) instructions
;
4535 /* From page 21 (page 27 of the PDF) of the GLSL 1.20 spec,
4537 * "Function declarations (prototypes) cannot occur inside of functions;
4538 * they must be at global scope, or for the built-in functions, outside
4539 * the global scope."
4541 * From page 27 (page 33 of the PDF) of the GLSL ES 1.00.16 spec,
4543 * "User defined functions may only be defined within the global scope."
4545 * Note that this language does not appear in GLSL 1.10.
4547 if ((state
->current_function
!= NULL
) &&
4548 state
->is_version(120, 100)) {
4549 YYLTYPE loc
= this->get_location();
4550 _mesa_glsl_error(&loc
, state
,
4551 "declaration of function `%s' not allowed within "
4552 "function body", name
);
4555 validate_identifier(name
, this->get_location(), state
);
4557 /* Convert the list of function parameters to HIR now so that they can be
4558 * used below to compare this function's signature with previously seen
4559 * signatures for functions with the same name.
4561 ast_parameter_declarator::parameters_to_hir(& this->parameters
,
4563 & hir_parameters
, state
);
4565 const char *return_type_name
;
4566 const glsl_type
*return_type
=
4567 this->return_type
->glsl_type(& return_type_name
, state
);
4570 YYLTYPE loc
= this->get_location();
4571 _mesa_glsl_error(&loc
, state
,
4572 "function `%s' has undeclared return type `%s'",
4573 name
, return_type_name
);
4574 return_type
= glsl_type::error_type
;
4577 /* ARB_shader_subroutine states:
4578 * "Subroutine declarations cannot be prototyped. It is an error to prepend
4579 * subroutine(...) to a function declaration."
4581 if (this->return_type
->qualifier
.flags
.q
.subroutine_def
&& !is_definition
) {
4582 YYLTYPE loc
= this->get_location();
4583 _mesa_glsl_error(&loc
, state
,
4584 "function declaration `%s' cannot have subroutine prepended",
4588 /* From page 56 (page 62 of the PDF) of the GLSL 1.30 spec:
4589 * "No qualifier is allowed on the return type of a function."
4591 if (this->return_type
->has_qualifiers()) {
4592 YYLTYPE loc
= this->get_location();
4593 _mesa_glsl_error(& loc
, state
,
4594 "function `%s' return type has qualifiers", name
);
4597 /* Section 6.1 (Function Definitions) of the GLSL 1.20 spec says:
4599 * "Arrays are allowed as arguments and as the return type. In both
4600 * cases, the array must be explicitly sized."
4602 if (return_type
->is_unsized_array()) {
4603 YYLTYPE loc
= this->get_location();
4604 _mesa_glsl_error(& loc
, state
,
4605 "function `%s' return type array must be explicitly "
4609 /* From section 4.1.7 of the GLSL 4.40 spec:
4611 * "[Opaque types] can only be declared as function parameters
4612 * or uniform-qualified variables."
4614 if (return_type
->contains_opaque()) {
4615 YYLTYPE loc
= this->get_location();
4616 _mesa_glsl_error(&loc
, state
,
4617 "function `%s' return type can't contain an opaque type",
4621 /* Create an ir_function if one doesn't already exist. */
4622 f
= state
->symbols
->get_function(name
);
4624 f
= new(ctx
) ir_function(name
);
4625 if (!this->return_type
->qualifier
.flags
.q
.subroutine
) {
4626 if (!state
->symbols
->add_function(f
)) {
4627 /* This function name shadows a non-function use of the same name. */
4628 YYLTYPE loc
= this->get_location();
4629 _mesa_glsl_error(&loc
, state
, "function name `%s' conflicts with "
4630 "non-function", name
);
4634 emit_function(state
, f
);
4637 /* From GLSL ES 3.0 spec, chapter 6.1 "Function Definitions", page 71:
4639 * "A shader cannot redefine or overload built-in functions."
4641 * While in GLSL ES 1.0 specification, chapter 8 "Built-in Functions":
4643 * "User code can overload the built-in functions but cannot redefine
4646 if (state
->es_shader
&& state
->language_version
>= 300) {
4647 /* Local shader has no exact candidates; check the built-ins. */
4648 _mesa_glsl_initialize_builtin_functions();
4649 if (_mesa_glsl_find_builtin_function_by_name(name
)) {
4650 YYLTYPE loc
= this->get_location();
4651 _mesa_glsl_error(& loc
, state
,
4652 "A shader cannot redefine or overload built-in "
4653 "function `%s' in GLSL ES 3.00", name
);
4658 /* Verify that this function's signature either doesn't match a previously
4659 * seen signature for a function with the same name, or, if a match is found,
4660 * that the previously seen signature does not have an associated definition.
4662 if (state
->es_shader
|| f
->has_user_signature()) {
4663 sig
= f
->exact_matching_signature(state
, &hir_parameters
);
4665 const char *badvar
= sig
->qualifiers_match(&hir_parameters
);
4666 if (badvar
!= NULL
) {
4667 YYLTYPE loc
= this->get_location();
4669 _mesa_glsl_error(&loc
, state
, "function `%s' parameter `%s' "
4670 "qualifiers don't match prototype", name
, badvar
);
4673 if (sig
->return_type
!= return_type
) {
4674 YYLTYPE loc
= this->get_location();
4676 _mesa_glsl_error(&loc
, state
, "function `%s' return type doesn't "
4677 "match prototype", name
);
4680 if (sig
->is_defined
) {
4681 if (is_definition
) {
4682 YYLTYPE loc
= this->get_location();
4683 _mesa_glsl_error(& loc
, state
, "function `%s' redefined", name
);
4685 /* We just encountered a prototype that exactly matches a
4686 * function that's already been defined. This is redundant,
4687 * and we should ignore it.
4695 /* Verify the return type of main() */
4696 if (strcmp(name
, "main") == 0) {
4697 if (! return_type
->is_void()) {
4698 YYLTYPE loc
= this->get_location();
4700 _mesa_glsl_error(& loc
, state
, "main() must return void");
4703 if (!hir_parameters
.is_empty()) {
4704 YYLTYPE loc
= this->get_location();
4706 _mesa_glsl_error(& loc
, state
, "main() must not take any parameters");
4710 /* Finish storing the information about this new function in its signature.
4713 sig
= new(ctx
) ir_function_signature(return_type
);
4714 f
->add_signature(sig
);
4717 sig
->replace_parameters(&hir_parameters
);
4720 if (this->return_type
->qualifier
.flags
.q
.subroutine_def
) {
4723 f
->num_subroutine_types
= this->return_type
->qualifier
.subroutine_list
->declarations
.length();
4724 f
->subroutine_types
= ralloc_array(state
, const struct glsl_type
*,
4725 f
->num_subroutine_types
);
4727 foreach_list_typed(ast_declaration
, decl
, link
, &this->return_type
->qualifier
.subroutine_list
->declarations
) {
4728 const struct glsl_type
*type
;
4729 /* the subroutine type must be already declared */
4730 type
= state
->symbols
->get_type(decl
->identifier
);
4732 _mesa_glsl_error(& loc
, state
, "unknown type '%s' in subroutine function definition", decl
->identifier
);
4734 f
->subroutine_types
[idx
++] = type
;
4736 state
->subroutines
= (ir_function
**)reralloc(state
, state
->subroutines
,
4738 state
->num_subroutines
+ 1);
4739 state
->subroutines
[state
->num_subroutines
] = f
;
4740 state
->num_subroutines
++;
4744 if (this->return_type
->qualifier
.flags
.q
.subroutine
) {
4745 if (!state
->symbols
->add_type(this->identifier
, glsl_type::get_subroutine_instance(this->identifier
))) {
4746 _mesa_glsl_error(& loc
, state
, "type '%s' previously defined", this->identifier
);
4749 state
->subroutine_types
= (ir_function
**)reralloc(state
, state
->subroutine_types
,
4751 state
->num_subroutine_types
+ 1);
4752 state
->subroutine_types
[state
->num_subroutine_types
] = f
;
4753 state
->num_subroutine_types
++;
4755 f
->is_subroutine
= true;
4758 /* Function declarations (prototypes) do not have r-values.
4765 ast_function_definition::hir(exec_list
*instructions
,
4766 struct _mesa_glsl_parse_state
*state
)
4768 prototype
->is_definition
= true;
4769 prototype
->hir(instructions
, state
);
4771 ir_function_signature
*signature
= prototype
->signature
;
4772 if (signature
== NULL
)
4775 assert(state
->current_function
== NULL
);
4776 state
->current_function
= signature
;
4777 state
->found_return
= false;
4779 /* Duplicate parameters declared in the prototype as concrete variables.
4780 * Add these to the symbol table.
4782 state
->symbols
->push_scope();
4783 foreach_in_list(ir_variable
, var
, &signature
->parameters
) {
4784 assert(var
->as_variable() != NULL
);
4786 /* The only way a parameter would "exist" is if two parameters have
4789 if (state
->symbols
->name_declared_this_scope(var
->name
)) {
4790 YYLTYPE loc
= this->get_location();
4792 _mesa_glsl_error(& loc
, state
, "parameter `%s' redeclared", var
->name
);
4794 state
->symbols
->add_variable(var
);
4798 /* Convert the body of the function to HIR. */
4799 this->body
->hir(&signature
->body
, state
);
4800 signature
->is_defined
= true;
4802 state
->symbols
->pop_scope();
4804 assert(state
->current_function
== signature
);
4805 state
->current_function
= NULL
;
4807 if (!signature
->return_type
->is_void() && !state
->found_return
) {
4808 YYLTYPE loc
= this->get_location();
4809 _mesa_glsl_error(& loc
, state
, "function `%s' has non-void return type "
4810 "%s, but no return statement",
4811 signature
->function_name(),
4812 signature
->return_type
->name
);
4815 /* Function definitions do not have r-values.
4822 ast_jump_statement::hir(exec_list
*instructions
,
4823 struct _mesa_glsl_parse_state
*state
)
4830 assert(state
->current_function
);
4832 if (opt_return_value
) {
4833 ir_rvalue
*ret
= opt_return_value
->hir(instructions
, state
);
4835 /* The value of the return type can be NULL if the shader says
4836 * 'return foo();' and foo() is a function that returns void.
4838 * NOTE: The GLSL spec doesn't say that this is an error. The type
4839 * of the return value is void. If the return type of the function is
4840 * also void, then this should compile without error. Seriously.
4842 const glsl_type
*const ret_type
=
4843 (ret
== NULL
) ? glsl_type::void_type
: ret
->type
;
4845 /* Implicit conversions are not allowed for return values prior to
4846 * ARB_shading_language_420pack.
4848 if (state
->current_function
->return_type
!= ret_type
) {
4849 YYLTYPE loc
= this->get_location();
4851 if (state
->ARB_shading_language_420pack_enable
) {
4852 if (!apply_implicit_conversion(state
->current_function
->return_type
,
4854 _mesa_glsl_error(& loc
, state
,
4855 "could not implicitly convert return value "
4856 "to %s, in function `%s'",
4857 state
->current_function
->return_type
->name
,
4858 state
->current_function
->function_name());
4861 _mesa_glsl_error(& loc
, state
,
4862 "`return' with wrong type %s, in function `%s' "
4865 state
->current_function
->function_name(),
4866 state
->current_function
->return_type
->name
);
4868 } else if (state
->current_function
->return_type
->base_type
==
4870 YYLTYPE loc
= this->get_location();
4872 /* The ARB_shading_language_420pack, GLSL ES 3.0, and GLSL 4.20
4873 * specs add a clarification:
4875 * "A void function can only use return without a return argument, even if
4876 * the return argument has void type. Return statements only accept values:
4879 * void func2() { return func1(); } // illegal return statement"
4881 _mesa_glsl_error(& loc
, state
,
4882 "void functions can only use `return' without a "
4886 inst
= new(ctx
) ir_return(ret
);
4888 if (state
->current_function
->return_type
->base_type
!=
4890 YYLTYPE loc
= this->get_location();
4892 _mesa_glsl_error(& loc
, state
,
4893 "`return' with no value, in function %s returning "
4895 state
->current_function
->function_name());
4897 inst
= new(ctx
) ir_return
;
4900 state
->found_return
= true;
4901 instructions
->push_tail(inst
);
4906 if (state
->stage
!= MESA_SHADER_FRAGMENT
) {
4907 YYLTYPE loc
= this->get_location();
4909 _mesa_glsl_error(& loc
, state
,
4910 "`discard' may only appear in a fragment shader");
4912 instructions
->push_tail(new(ctx
) ir_discard
);
4917 if (mode
== ast_continue
&&
4918 state
->loop_nesting_ast
== NULL
) {
4919 YYLTYPE loc
= this->get_location();
4921 _mesa_glsl_error(& loc
, state
, "continue may only appear in a loop");
4922 } else if (mode
== ast_break
&&
4923 state
->loop_nesting_ast
== NULL
&&
4924 state
->switch_state
.switch_nesting_ast
== NULL
) {
4925 YYLTYPE loc
= this->get_location();
4927 _mesa_glsl_error(& loc
, state
,
4928 "break may only appear in a loop or a switch");
4930 /* For a loop, inline the for loop expression again, since we don't
4931 * know where near the end of the loop body the normal copy of it is
4932 * going to be placed. Same goes for the condition for a do-while
4935 if (state
->loop_nesting_ast
!= NULL
&&
4936 mode
== ast_continue
&& !state
->switch_state
.is_switch_innermost
) {
4937 if (state
->loop_nesting_ast
->rest_expression
) {
4938 state
->loop_nesting_ast
->rest_expression
->hir(instructions
,
4941 if (state
->loop_nesting_ast
->mode
==
4942 ast_iteration_statement::ast_do_while
) {
4943 state
->loop_nesting_ast
->condition_to_hir(instructions
, state
);
4947 if (state
->switch_state
.is_switch_innermost
&&
4948 mode
== ast_continue
) {
4949 /* Set 'continue_inside' to true. */
4950 ir_rvalue
*const true_val
= new (ctx
) ir_constant(true);
4951 ir_dereference_variable
*deref_continue_inside_var
=
4952 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
4953 instructions
->push_tail(new(ctx
) ir_assignment(deref_continue_inside_var
,
4956 /* Break out from the switch, continue for the loop will
4957 * be called right after switch. */
4958 ir_loop_jump
*const jump
=
4959 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
4960 instructions
->push_tail(jump
);
4962 } else if (state
->switch_state
.is_switch_innermost
&&
4963 mode
== ast_break
) {
4964 /* Force break out of switch by inserting a break. */
4965 ir_loop_jump
*const jump
=
4966 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
4967 instructions
->push_tail(jump
);
4969 ir_loop_jump
*const jump
=
4970 new(ctx
) ir_loop_jump((mode
== ast_break
)
4971 ? ir_loop_jump::jump_break
4972 : ir_loop_jump::jump_continue
);
4973 instructions
->push_tail(jump
);
4980 /* Jump instructions do not have r-values.
4987 ast_selection_statement::hir(exec_list
*instructions
,
4988 struct _mesa_glsl_parse_state
*state
)
4992 ir_rvalue
*const condition
= this->condition
->hir(instructions
, state
);
4994 /* From page 66 (page 72 of the PDF) of the GLSL 1.50 spec:
4996 * "Any expression whose type evaluates to a Boolean can be used as the
4997 * conditional expression bool-expression. Vector types are not accepted
4998 * as the expression to if."
5000 * The checks are separated so that higher quality diagnostics can be
5001 * generated for cases where both rules are violated.
5003 if (!condition
->type
->is_boolean() || !condition
->type
->is_scalar()) {
5004 YYLTYPE loc
= this->condition
->get_location();
5006 _mesa_glsl_error(& loc
, state
, "if-statement condition must be scalar "
5010 ir_if
*const stmt
= new(ctx
) ir_if(condition
);
5012 if (then_statement
!= NULL
) {
5013 state
->symbols
->push_scope();
5014 then_statement
->hir(& stmt
->then_instructions
, state
);
5015 state
->symbols
->pop_scope();
5018 if (else_statement
!= NULL
) {
5019 state
->symbols
->push_scope();
5020 else_statement
->hir(& stmt
->else_instructions
, state
);
5021 state
->symbols
->pop_scope();
5024 instructions
->push_tail(stmt
);
5026 /* if-statements do not have r-values.
5033 ast_switch_statement::hir(exec_list
*instructions
,
5034 struct _mesa_glsl_parse_state
*state
)
5038 ir_rvalue
*const test_expression
=
5039 this->test_expression
->hir(instructions
, state
);
5041 /* From page 66 (page 55 of the PDF) of the GLSL 1.50 spec:
5043 * "The type of init-expression in a switch statement must be a
5046 if (!test_expression
->type
->is_scalar() ||
5047 !test_expression
->type
->is_integer()) {
5048 YYLTYPE loc
= this->test_expression
->get_location();
5050 _mesa_glsl_error(& loc
,
5052 "switch-statement expression must be scalar "
5056 /* Track the switch-statement nesting in a stack-like manner.
5058 struct glsl_switch_state saved
= state
->switch_state
;
5060 state
->switch_state
.is_switch_innermost
= true;
5061 state
->switch_state
.switch_nesting_ast
= this;
5062 state
->switch_state
.labels_ht
= hash_table_ctor(0, hash_table_pointer_hash
,
5063 hash_table_pointer_compare
);
5064 state
->switch_state
.previous_default
= NULL
;
5066 /* Initalize is_fallthru state to false.
5068 ir_rvalue
*const is_fallthru_val
= new (ctx
) ir_constant(false);
5069 state
->switch_state
.is_fallthru_var
=
5070 new(ctx
) ir_variable(glsl_type::bool_type
,
5071 "switch_is_fallthru_tmp",
5073 instructions
->push_tail(state
->switch_state
.is_fallthru_var
);
5075 ir_dereference_variable
*deref_is_fallthru_var
=
5076 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
5077 instructions
->push_tail(new(ctx
) ir_assignment(deref_is_fallthru_var
,
5080 /* Initialize continue_inside state to false.
5082 state
->switch_state
.continue_inside
=
5083 new(ctx
) ir_variable(glsl_type::bool_type
,
5084 "continue_inside_tmp",
5086 instructions
->push_tail(state
->switch_state
.continue_inside
);
5088 ir_rvalue
*const false_val
= new (ctx
) ir_constant(false);
5089 ir_dereference_variable
*deref_continue_inside_var
=
5090 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
5091 instructions
->push_tail(new(ctx
) ir_assignment(deref_continue_inside_var
,
5094 state
->switch_state
.run_default
=
5095 new(ctx
) ir_variable(glsl_type::bool_type
,
5098 instructions
->push_tail(state
->switch_state
.run_default
);
5100 /* Loop around the switch is used for flow control. */
5101 ir_loop
* loop
= new(ctx
) ir_loop();
5102 instructions
->push_tail(loop
);
5104 /* Cache test expression.
5106 test_to_hir(&loop
->body_instructions
, state
);
5108 /* Emit code for body of switch stmt.
5110 body
->hir(&loop
->body_instructions
, state
);
5112 /* Insert a break at the end to exit loop. */
5113 ir_loop_jump
*jump
= new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
5114 loop
->body_instructions
.push_tail(jump
);
5116 /* If we are inside loop, check if continue got called inside switch. */
5117 if (state
->loop_nesting_ast
!= NULL
) {
5118 ir_dereference_variable
*deref_continue_inside
=
5119 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
5120 ir_if
*irif
= new(ctx
) ir_if(deref_continue_inside
);
5121 ir_loop_jump
*jump
= new(ctx
) ir_loop_jump(ir_loop_jump::jump_continue
);
5123 if (state
->loop_nesting_ast
!= NULL
) {
5124 if (state
->loop_nesting_ast
->rest_expression
) {
5125 state
->loop_nesting_ast
->rest_expression
->hir(&irif
->then_instructions
,
5128 if (state
->loop_nesting_ast
->mode
==
5129 ast_iteration_statement::ast_do_while
) {
5130 state
->loop_nesting_ast
->condition_to_hir(&irif
->then_instructions
, state
);
5133 irif
->then_instructions
.push_tail(jump
);
5134 instructions
->push_tail(irif
);
5137 hash_table_dtor(state
->switch_state
.labels_ht
);
5139 state
->switch_state
= saved
;
5141 /* Switch statements do not have r-values. */
5147 ast_switch_statement::test_to_hir(exec_list
*instructions
,
5148 struct _mesa_glsl_parse_state
*state
)
5152 /* Cache value of test expression. */
5153 ir_rvalue
*const test_val
=
5154 test_expression
->hir(instructions
,
5157 state
->switch_state
.test_var
= new(ctx
) ir_variable(test_val
->type
,
5160 ir_dereference_variable
*deref_test_var
=
5161 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
5163 instructions
->push_tail(state
->switch_state
.test_var
);
5164 instructions
->push_tail(new(ctx
) ir_assignment(deref_test_var
, test_val
));
5169 ast_switch_body::hir(exec_list
*instructions
,
5170 struct _mesa_glsl_parse_state
*state
)
5173 stmts
->hir(instructions
, state
);
5175 /* Switch bodies do not have r-values. */
5180 ast_case_statement_list::hir(exec_list
*instructions
,
5181 struct _mesa_glsl_parse_state
*state
)
5183 exec_list default_case
, after_default
, tmp
;
5185 foreach_list_typed (ast_case_statement
, case_stmt
, link
, & this->cases
) {
5186 case_stmt
->hir(&tmp
, state
);
5189 if (state
->switch_state
.previous_default
&& default_case
.is_empty()) {
5190 default_case
.append_list(&tmp
);
5194 /* If default case found, append 'after_default' list. */
5195 if (!default_case
.is_empty())
5196 after_default
.append_list(&tmp
);
5198 instructions
->append_list(&tmp
);
5201 /* Handle the default case. This is done here because default might not be
5202 * the last case. We need to add checks against following cases first to see
5203 * if default should be chosen or not.
5205 if (!default_case
.is_empty()) {
5207 ir_rvalue
*const true_val
= new (state
) ir_constant(true);
5208 ir_dereference_variable
*deref_run_default_var
=
5209 new(state
) ir_dereference_variable(state
->switch_state
.run_default
);
5211 /* Choose to run default case initially, following conditional
5212 * assignments might change this.
5214 ir_assignment
*const init_var
=
5215 new(state
) ir_assignment(deref_run_default_var
, true_val
);
5216 instructions
->push_tail(init_var
);
5218 /* Default case was the last one, no checks required. */
5219 if (after_default
.is_empty()) {
5220 instructions
->append_list(&default_case
);
5224 foreach_in_list(ir_instruction
, ir
, &after_default
) {
5225 ir_assignment
*assign
= ir
->as_assignment();
5230 /* Clone the check between case label and init expression. */
5231 ir_expression
*exp
= (ir_expression
*) assign
->condition
;
5232 ir_expression
*clone
= exp
->clone(state
, NULL
);
5234 ir_dereference_variable
*deref_var
=
5235 new(state
) ir_dereference_variable(state
->switch_state
.run_default
);
5236 ir_rvalue
*const false_val
= new (state
) ir_constant(false);
5238 ir_assignment
*const set_false
=
5239 new(state
) ir_assignment(deref_var
, false_val
, clone
);
5241 instructions
->push_tail(set_false
);
5244 /* Append default case and all cases after it. */
5245 instructions
->append_list(&default_case
);
5246 instructions
->append_list(&after_default
);
5249 /* Case statements do not have r-values. */
5254 ast_case_statement::hir(exec_list
*instructions
,
5255 struct _mesa_glsl_parse_state
*state
)
5257 labels
->hir(instructions
, state
);
5259 /* Guard case statements depending on fallthru state. */
5260 ir_dereference_variable
*const deref_fallthru_guard
=
5261 new(state
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
5262 ir_if
*const test_fallthru
= new(state
) ir_if(deref_fallthru_guard
);
5264 foreach_list_typed (ast_node
, stmt
, link
, & this->stmts
)
5265 stmt
->hir(& test_fallthru
->then_instructions
, state
);
5267 instructions
->push_tail(test_fallthru
);
5269 /* Case statements do not have r-values. */
5275 ast_case_label_list::hir(exec_list
*instructions
,
5276 struct _mesa_glsl_parse_state
*state
)
5278 foreach_list_typed (ast_case_label
, label
, link
, & this->labels
)
5279 label
->hir(instructions
, state
);
5281 /* Case labels do not have r-values. */
5286 ast_case_label::hir(exec_list
*instructions
,
5287 struct _mesa_glsl_parse_state
*state
)
5291 ir_dereference_variable
*deref_fallthru_var
=
5292 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
5294 ir_rvalue
*const true_val
= new(ctx
) ir_constant(true);
5296 /* If not default case, ... */
5297 if (this->test_value
!= NULL
) {
5298 /* Conditionally set fallthru state based on
5299 * comparison of cached test expression value to case label.
5301 ir_rvalue
*const label_rval
= this->test_value
->hir(instructions
, state
);
5302 ir_constant
*label_const
= label_rval
->constant_expression_value();
5305 YYLTYPE loc
= this->test_value
->get_location();
5307 _mesa_glsl_error(& loc
, state
,
5308 "switch statement case label must be a "
5309 "constant expression");
5311 /* Stuff a dummy value in to allow processing to continue. */
5312 label_const
= new(ctx
) ir_constant(0);
5314 ast_expression
*previous_label
= (ast_expression
*)
5315 hash_table_find(state
->switch_state
.labels_ht
,
5316 (void *)(uintptr_t)label_const
->value
.u
[0]);
5318 if (previous_label
) {
5319 YYLTYPE loc
= this->test_value
->get_location();
5320 _mesa_glsl_error(& loc
, state
, "duplicate case value");
5322 loc
= previous_label
->get_location();
5323 _mesa_glsl_error(& loc
, state
, "this is the previous case label");
5325 hash_table_insert(state
->switch_state
.labels_ht
,
5327 (void *)(uintptr_t)label_const
->value
.u
[0]);
5331 ir_dereference_variable
*deref_test_var
=
5332 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
5334 ir_expression
*test_cond
= new(ctx
) ir_expression(ir_binop_all_equal
,
5339 * From GLSL 4.40 specification section 6.2 ("Selection"):
5341 * "The type of the init-expression value in a switch statement must
5342 * be a scalar int or uint. The type of the constant-expression value
5343 * in a case label also must be a scalar int or uint. When any pair
5344 * of these values is tested for "equal value" and the types do not
5345 * match, an implicit conversion will be done to convert the int to a
5346 * uint (see section 4.1.10 “Implicit Conversions”) before the compare
5349 if (label_const
->type
!= state
->switch_state
.test_var
->type
) {
5350 YYLTYPE loc
= this->test_value
->get_location();
5352 const glsl_type
*type_a
= label_const
->type
;
5353 const glsl_type
*type_b
= state
->switch_state
.test_var
->type
;
5355 /* Check if int->uint implicit conversion is supported. */
5356 bool integer_conversion_supported
=
5357 glsl_type::int_type
->can_implicitly_convert_to(glsl_type::uint_type
,
5360 if ((!type_a
->is_integer() || !type_b
->is_integer()) ||
5361 !integer_conversion_supported
) {
5362 _mesa_glsl_error(&loc
, state
, "type mismatch with switch "
5363 "init-expression and case label (%s != %s)",
5364 type_a
->name
, type_b
->name
);
5366 /* Conversion of the case label. */
5367 if (type_a
->base_type
== GLSL_TYPE_INT
) {
5368 if (!apply_implicit_conversion(glsl_type::uint_type
,
5369 test_cond
->operands
[0], state
))
5370 _mesa_glsl_error(&loc
, state
, "implicit type conversion error");
5372 /* Conversion of the init-expression value. */
5373 if (!apply_implicit_conversion(glsl_type::uint_type
,
5374 test_cond
->operands
[1], state
))
5375 _mesa_glsl_error(&loc
, state
, "implicit type conversion error");
5380 ir_assignment
*set_fallthru_on_test
=
5381 new(ctx
) ir_assignment(deref_fallthru_var
, true_val
, test_cond
);
5383 instructions
->push_tail(set_fallthru_on_test
);
5384 } else { /* default case */
5385 if (state
->switch_state
.previous_default
) {
5386 YYLTYPE loc
= this->get_location();
5387 _mesa_glsl_error(& loc
, state
,
5388 "multiple default labels in one switch");
5390 loc
= state
->switch_state
.previous_default
->get_location();
5391 _mesa_glsl_error(& loc
, state
, "this is the first default label");
5393 state
->switch_state
.previous_default
= this;
5395 /* Set fallthru condition on 'run_default' bool. */
5396 ir_dereference_variable
*deref_run_default
=
5397 new(ctx
) ir_dereference_variable(state
->switch_state
.run_default
);
5398 ir_rvalue
*const cond_true
= new(ctx
) ir_constant(true);
5399 ir_expression
*test_cond
= new(ctx
) ir_expression(ir_binop_all_equal
,
5403 /* Set falltrhu state. */
5404 ir_assignment
*set_fallthru
=
5405 new(ctx
) ir_assignment(deref_fallthru_var
, true_val
, test_cond
);
5407 instructions
->push_tail(set_fallthru
);
5410 /* Case statements do not have r-values. */
5415 ast_iteration_statement::condition_to_hir(exec_list
*instructions
,
5416 struct _mesa_glsl_parse_state
*state
)
5420 if (condition
!= NULL
) {
5421 ir_rvalue
*const cond
=
5422 condition
->hir(instructions
, state
);
5425 || !cond
->type
->is_boolean() || !cond
->type
->is_scalar()) {
5426 YYLTYPE loc
= condition
->get_location();
5428 _mesa_glsl_error(& loc
, state
,
5429 "loop condition must be scalar boolean");
5431 /* As the first code in the loop body, generate a block that looks
5432 * like 'if (!condition) break;' as the loop termination condition.
5434 ir_rvalue
*const not_cond
=
5435 new(ctx
) ir_expression(ir_unop_logic_not
, cond
);
5437 ir_if
*const if_stmt
= new(ctx
) ir_if(not_cond
);
5439 ir_jump
*const break_stmt
=
5440 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
5442 if_stmt
->then_instructions
.push_tail(break_stmt
);
5443 instructions
->push_tail(if_stmt
);
5450 ast_iteration_statement::hir(exec_list
*instructions
,
5451 struct _mesa_glsl_parse_state
*state
)
5455 /* For-loops and while-loops start a new scope, but do-while loops do not.
5457 if (mode
!= ast_do_while
)
5458 state
->symbols
->push_scope();
5460 if (init_statement
!= NULL
)
5461 init_statement
->hir(instructions
, state
);
5463 ir_loop
*const stmt
= new(ctx
) ir_loop();
5464 instructions
->push_tail(stmt
);
5466 /* Track the current loop nesting. */
5467 ast_iteration_statement
*nesting_ast
= state
->loop_nesting_ast
;
5469 state
->loop_nesting_ast
= this;
5471 /* Likewise, indicate that following code is closest to a loop,
5472 * NOT closest to a switch.
5474 bool saved_is_switch_innermost
= state
->switch_state
.is_switch_innermost
;
5475 state
->switch_state
.is_switch_innermost
= false;
5477 if (mode
!= ast_do_while
)
5478 condition_to_hir(&stmt
->body_instructions
, state
);
5481 body
->hir(& stmt
->body_instructions
, state
);
5483 if (rest_expression
!= NULL
)
5484 rest_expression
->hir(& stmt
->body_instructions
, state
);
5486 if (mode
== ast_do_while
)
5487 condition_to_hir(&stmt
->body_instructions
, state
);
5489 if (mode
!= ast_do_while
)
5490 state
->symbols
->pop_scope();
5492 /* Restore previous nesting before returning. */
5493 state
->loop_nesting_ast
= nesting_ast
;
5494 state
->switch_state
.is_switch_innermost
= saved_is_switch_innermost
;
5496 /* Loops do not have r-values.
5503 * Determine if the given type is valid for establishing a default precision
5506 * From GLSL ES 3.00 section 4.5.4 ("Default Precision Qualifiers"):
5508 * "The precision statement
5510 * precision precision-qualifier type;
5512 * can be used to establish a default precision qualifier. The type field
5513 * can be either int or float or any of the sampler types, and the
5514 * precision-qualifier can be lowp, mediump, or highp."
5516 * GLSL ES 1.00 has similar language. GLSL 1.30 doesn't allow precision
5517 * qualifiers on sampler types, but this seems like an oversight (since the
5518 * intention of including these in GLSL 1.30 is to allow compatibility with ES
5519 * shaders). So we allow int, float, and all sampler types regardless of GLSL
5523 is_valid_default_precision_type(const struct glsl_type
*const type
)
5528 switch (type
->base_type
) {
5530 case GLSL_TYPE_FLOAT
:
5531 /* "int" and "float" are valid, but vectors and matrices are not. */
5532 return type
->vector_elements
== 1 && type
->matrix_columns
== 1;
5533 case GLSL_TYPE_SAMPLER
:
5534 case GLSL_TYPE_IMAGE
:
5535 case GLSL_TYPE_ATOMIC_UINT
:
5544 ast_type_specifier::hir(exec_list
*instructions
,
5545 struct _mesa_glsl_parse_state
*state
)
5547 if (this->default_precision
== ast_precision_none
&& this->structure
== NULL
)
5550 YYLTYPE loc
= this->get_location();
5552 /* If this is a precision statement, check that the type to which it is
5553 * applied is either float or int.
5555 * From section 4.5.3 of the GLSL 1.30 spec:
5556 * "The precision statement
5557 * precision precision-qualifier type;
5558 * can be used to establish a default precision qualifier. The type
5559 * field can be either int or float [...]. Any other types or
5560 * qualifiers will result in an error.
5562 if (this->default_precision
!= ast_precision_none
) {
5563 if (!state
->check_precision_qualifiers_allowed(&loc
))
5566 if (this->structure
!= NULL
) {
5567 _mesa_glsl_error(&loc
, state
,
5568 "precision qualifiers do not apply to structures");
5572 if (this->array_specifier
!= NULL
) {
5573 _mesa_glsl_error(&loc
, state
,
5574 "default precision statements do not apply to "
5579 const struct glsl_type
*const type
=
5580 state
->symbols
->get_type(this->type_name
);
5581 if (!is_valid_default_precision_type(type
)) {
5582 _mesa_glsl_error(&loc
, state
,
5583 "default precision statements apply only to "
5584 "float, int, and opaque types");
5588 if (type
->base_type
== GLSL_TYPE_FLOAT
5590 && state
->stage
== MESA_SHADER_FRAGMENT
) {
5591 /* Section 4.5.3 (Default Precision Qualifiers) of the GLSL ES 1.00
5594 * "The fragment language has no default precision qualifier for
5595 * floating point types."
5597 * As a result, we have to track whether or not default precision has
5598 * been specified for float in GLSL ES fragment shaders.
5600 * Earlier in that same section, the spec says:
5602 * "Non-precision qualified declarations will use the precision
5603 * qualifier specified in the most recent precision statement
5604 * that is still in scope. The precision statement has the same
5605 * scoping rules as variable declarations. If it is declared
5606 * inside a compound statement, its effect stops at the end of
5607 * the innermost statement it was declared in. Precision
5608 * statements in nested scopes override precision statements in
5609 * outer scopes. Multiple precision statements for the same basic
5610 * type can appear inside the same scope, with later statements
5611 * overriding earlier statements within that scope."
5613 * Default precision specifications follow the same scope rules as
5614 * variables. So, we can track the state of the default float
5615 * precision in the symbol table, and the rules will just work. This
5616 * is a slight abuse of the symbol table, but it has the semantics
5619 ir_variable
*const junk
=
5620 new(state
) ir_variable(type
, "#default precision",
5623 state
->symbols
->add_variable(junk
);
5626 /* FINISHME: Translate precision statements into IR. */
5630 /* _mesa_ast_set_aggregate_type() sets the <structure> field so that
5631 * process_record_constructor() can do type-checking on C-style initializer
5632 * expressions of structs, but ast_struct_specifier should only be translated
5633 * to HIR if it is declaring the type of a structure.
5635 * The ->is_declaration field is false for initializers of variables
5636 * declared separately from the struct's type definition.
5638 * struct S { ... }; (is_declaration = true)
5639 * struct T { ... } t = { ... }; (is_declaration = true)
5640 * S s = { ... }; (is_declaration = false)
5642 if (this->structure
!= NULL
&& this->structure
->is_declaration
)
5643 return this->structure
->hir(instructions
, state
);
5650 * Process a structure or interface block tree into an array of structure fields
5652 * After parsing, where there are some syntax differnces, structures and
5653 * interface blocks are almost identical. They are similar enough that the
5654 * AST for each can be processed the same way into a set of
5655 * \c glsl_struct_field to describe the members.
5657 * If we're processing an interface block, var_mode should be the type of the
5658 * interface block (ir_var_shader_in, ir_var_shader_out, ir_var_uniform or
5659 * ir_var_shader_storage). If we're processing a structure, var_mode should be
5663 * The number of fields processed. A pointer to the array structure fields is
5664 * stored in \c *fields_ret.
5667 ast_process_structure_or_interface_block(exec_list
*instructions
,
5668 struct _mesa_glsl_parse_state
*state
,
5669 exec_list
*declarations
,
5671 glsl_struct_field
**fields_ret
,
5673 enum glsl_matrix_layout matrix_layout
,
5674 bool allow_reserved_names
,
5675 ir_variable_mode var_mode
,
5676 ast_type_qualifier
*layout
)
5678 unsigned decl_count
= 0;
5680 /* For blocks that accept memory qualifiers (i.e. shader storage), verify
5681 * that we don't have incompatible qualifiers
5683 if (layout
&& layout
->flags
.q
.read_only
&& layout
->flags
.q
.write_only
) {
5684 _mesa_glsl_error(&loc
, state
,
5685 "Interface block sets both readonly and writeonly");
5688 /* Make an initial pass over the list of fields to determine how
5689 * many there are. Each element in this list is an ast_declarator_list.
5690 * This means that we actually need to count the number of elements in the
5691 * 'declarations' list in each of the elements.
5693 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
5694 decl_count
+= decl_list
->declarations
.length();
5697 /* Allocate storage for the fields and process the field
5698 * declarations. As the declarations are processed, try to also convert
5699 * the types to HIR. This ensures that structure definitions embedded in
5700 * other structure definitions or in interface blocks are processed.
5702 glsl_struct_field
*const fields
= ralloc_array(state
, glsl_struct_field
,
5706 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
5707 const char *type_name
;
5709 decl_list
->type
->specifier
->hir(instructions
, state
);
5711 /* Section 10.9 of the GLSL ES 1.00 specification states that
5712 * embedded structure definitions have been removed from the language.
5714 if (state
->es_shader
&& decl_list
->type
->specifier
->structure
!= NULL
) {
5715 _mesa_glsl_error(&loc
, state
, "embedded structure definitions are "
5716 "not allowed in GLSL ES 1.00");
5719 const glsl_type
*decl_type
=
5720 decl_list
->type
->glsl_type(& type_name
, state
);
5722 foreach_list_typed (ast_declaration
, decl
, link
,
5723 &decl_list
->declarations
) {
5724 if (!allow_reserved_names
)
5725 validate_identifier(decl
->identifier
, loc
, state
);
5727 /* From section 4.3.9 of the GLSL 4.40 spec:
5729 * "[In interface blocks] opaque types are not allowed."
5731 * It should be impossible for decl_type to be NULL here. Cases that
5732 * might naturally lead to decl_type being NULL, especially for the
5733 * is_interface case, will have resulted in compilation having
5734 * already halted due to a syntax error.
5738 if (is_interface
&& decl_type
->contains_opaque()) {
5739 YYLTYPE loc
= decl_list
->get_location();
5740 _mesa_glsl_error(&loc
, state
,
5741 "uniform/buffer in non-default interface block contains "
5745 if (decl_type
->contains_atomic()) {
5746 /* From section 4.1.7.3 of the GLSL 4.40 spec:
5748 * "Members of structures cannot be declared as atomic counter
5751 YYLTYPE loc
= decl_list
->get_location();
5752 _mesa_glsl_error(&loc
, state
, "atomic counter in structure, "
5753 "shader storage block or uniform block");
5756 if (decl_type
->contains_image()) {
5757 /* FINISHME: Same problem as with atomic counters.
5758 * FINISHME: Request clarification from Khronos and add
5759 * FINISHME: spec quotation here.
5761 YYLTYPE loc
= decl_list
->get_location();
5762 _mesa_glsl_error(&loc
, state
,
5763 "image in structure, shader storage block or "
5767 const struct ast_type_qualifier
*const qual
=
5768 & decl_list
->type
->qualifier
;
5770 if (qual
->flags
.q
.explicit_binding
)
5771 validate_binding_qualifier(state
, &loc
, decl_type
, qual
);
5773 if (qual
->flags
.q
.std140
||
5774 qual
->flags
.q
.std430
||
5775 qual
->flags
.q
.packed
||
5776 qual
->flags
.q
.shared
) {
5777 _mesa_glsl_error(&loc
, state
,
5778 "uniform/shader storage block layout qualifiers "
5779 "std140, std430, packed, and shared can only be "
5780 "applied to uniform/shader storage blocks, not "
5784 if (qual
->flags
.q
.constant
) {
5785 YYLTYPE loc
= decl_list
->get_location();
5786 _mesa_glsl_error(&loc
, state
,
5787 "const storage qualifier cannot be applied "
5788 "to struct or interface block members");
5791 const struct glsl_type
*field_type
=
5792 process_array_type(&loc
, decl_type
, decl
->array_specifier
, state
);
5793 fields
[i
].type
= field_type
;
5794 fields
[i
].name
= decl
->identifier
;
5795 fields
[i
].location
= -1;
5796 fields
[i
].interpolation
=
5797 interpret_interpolation_qualifier(qual
, var_mode
, state
, &loc
);
5798 fields
[i
].centroid
= qual
->flags
.q
.centroid
? 1 : 0;
5799 fields
[i
].sample
= qual
->flags
.q
.sample
? 1 : 0;
5800 fields
[i
].patch
= qual
->flags
.q
.patch
? 1 : 0;
5802 /* Only save explicitly defined streams in block's field */
5803 fields
[i
].stream
= qual
->flags
.q
.explicit_stream
? qual
->stream
: -1;
5805 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
5806 if (!qual
->flags
.q
.uniform
&& !qual
->flags
.q
.buffer
) {
5807 _mesa_glsl_error(&loc
, state
,
5808 "row_major and column_major can only be "
5809 "applied to interface blocks");
5811 validate_matrix_layout_for_type(state
, &loc
, field_type
, NULL
);
5814 if (qual
->flags
.q
.uniform
&& qual
->has_interpolation()) {
5815 _mesa_glsl_error(&loc
, state
,
5816 "interpolation qualifiers cannot be used "
5817 "with uniform interface blocks");
5820 if ((qual
->flags
.q
.uniform
|| !is_interface
) &&
5821 qual
->has_auxiliary_storage()) {
5822 _mesa_glsl_error(&loc
, state
,
5823 "auxiliary storage qualifiers cannot be used "
5824 "in uniform blocks or structures.");
5827 /* Propogate row- / column-major information down the fields of the
5828 * structure or interface block. Structures need this data because
5829 * the structure may contain a structure that contains ... a matrix
5830 * that need the proper layout.
5832 if (field_type
->without_array()->is_matrix()
5833 || field_type
->without_array()->is_record()) {
5834 /* If no layout is specified for the field, inherit the layout
5837 fields
[i
].matrix_layout
= matrix_layout
;
5839 if (qual
->flags
.q
.row_major
)
5840 fields
[i
].matrix_layout
= GLSL_MATRIX_LAYOUT_ROW_MAJOR
;
5841 else if (qual
->flags
.q
.column_major
)
5842 fields
[i
].matrix_layout
= GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
;
5844 /* If we're processing an interface block, the matrix layout must
5845 * be decided by this point.
5847 assert(!is_interface
5848 || fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_ROW_MAJOR
5849 || fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
);
5852 /* Image qualifiers are allowed on buffer variables, which can only
5853 * be defined inside shader storage buffer objects
5855 if (layout
&& var_mode
== ir_var_shader_storage
) {
5856 if (qual
->flags
.q
.read_only
&& qual
->flags
.q
.write_only
) {
5857 _mesa_glsl_error(&loc
, state
,
5858 "buffer variable `%s' can't be "
5859 "readonly and writeonly.", fields
[i
].name
);
5862 /* For readonly and writeonly qualifiers the field definition,
5863 * if set, overwrites the layout qualifier.
5865 bool read_only
= layout
->flags
.q
.read_only
;
5866 bool write_only
= layout
->flags
.q
.write_only
;
5868 if (qual
->flags
.q
.read_only
) {
5871 } else if (qual
->flags
.q
.write_only
) {
5876 fields
[i
].image_read_only
= read_only
;
5877 fields
[i
].image_write_only
= write_only
;
5879 /* For other qualifiers, we set the flag if either the layout
5880 * qualifier or the field qualifier are set
5882 fields
[i
].image_coherent
= qual
->flags
.q
.coherent
||
5883 layout
->flags
.q
.coherent
;
5884 fields
[i
].image_volatile
= qual
->flags
.q
._volatile
||
5885 layout
->flags
.q
._volatile
;
5886 fields
[i
].image_restrict
= qual
->flags
.q
.restrict_flag
||
5887 layout
->flags
.q
.restrict_flag
;
5894 assert(i
== decl_count
);
5896 *fields_ret
= fields
;
5902 ast_struct_specifier::hir(exec_list
*instructions
,
5903 struct _mesa_glsl_parse_state
*state
)
5905 YYLTYPE loc
= this->get_location();
5907 /* Section 4.1.8 (Structures) of the GLSL 1.10 spec says:
5909 * "Anonymous structures are not supported; so embedded structures must
5910 * have a declarator. A name given to an embedded struct is scoped at
5911 * the same level as the struct it is embedded in."
5913 * The same section of the GLSL 1.20 spec says:
5915 * "Anonymous structures are not supported. Embedded structures are not
5918 * struct S { float f; };
5920 * S; // Error: anonymous structures disallowed
5921 * struct { ... }; // Error: embedded structures disallowed
5922 * S s; // Okay: nested structures with name are allowed
5925 * The GLSL ES 1.00 and 3.00 specs have similar langauge and examples. So,
5926 * we allow embedded structures in 1.10 only.
5928 if (state
->language_version
!= 110 && state
->struct_specifier_depth
!= 0)
5929 _mesa_glsl_error(&loc
, state
,
5930 "embedded structure declarations are not allowed");
5932 state
->struct_specifier_depth
++;
5934 glsl_struct_field
*fields
;
5935 unsigned decl_count
=
5936 ast_process_structure_or_interface_block(instructions
,
5938 &this->declarations
,
5942 GLSL_MATRIX_LAYOUT_INHERITED
,
5943 false /* allow_reserved_names */,
5947 validate_identifier(this->name
, loc
, state
);
5949 const glsl_type
*t
=
5950 glsl_type::get_record_instance(fields
, decl_count
, this->name
);
5952 if (!state
->symbols
->add_type(name
, t
)) {
5953 _mesa_glsl_error(& loc
, state
, "struct `%s' previously defined", name
);
5955 const glsl_type
**s
= reralloc(state
, state
->user_structures
,
5957 state
->num_user_structures
+ 1);
5959 s
[state
->num_user_structures
] = t
;
5960 state
->user_structures
= s
;
5961 state
->num_user_structures
++;
5965 state
->struct_specifier_depth
--;
5967 /* Structure type definitions do not have r-values.
5974 * Visitor class which detects whether a given interface block has been used.
5976 class interface_block_usage_visitor
: public ir_hierarchical_visitor
5979 interface_block_usage_visitor(ir_variable_mode mode
, const glsl_type
*block
)
5980 : mode(mode
), block(block
), found(false)
5984 virtual ir_visitor_status
visit(ir_dereference_variable
*ir
)
5986 if (ir
->var
->data
.mode
== mode
&& ir
->var
->get_interface_type() == block
) {
5990 return visit_continue
;
5993 bool usage_found() const
5999 ir_variable_mode mode
;
6000 const glsl_type
*block
;
6005 is_unsized_array_last_element(ir_variable
*v
)
6007 const glsl_type
*interface_type
= v
->get_interface_type();
6008 int length
= interface_type
->length
;
6010 assert(v
->type
->is_unsized_array());
6012 /* Check if it is the last element of the interface */
6013 if (strcmp(interface_type
->fields
.structure
[length
-1].name
, v
->name
) == 0)
6019 ast_interface_block::hir(exec_list
*instructions
,
6020 struct _mesa_glsl_parse_state
*state
)
6022 YYLTYPE loc
= this->get_location();
6024 /* Interface blocks must be declared at global scope */
6025 if (state
->current_function
!= NULL
) {
6026 _mesa_glsl_error(&loc
, state
,
6027 "Interface block `%s' must be declared "
6032 if (!this->layout
.flags
.q
.buffer
&&
6033 this->layout
.flags
.q
.std430
) {
6034 _mesa_glsl_error(&loc
, state
,
6035 "std430 storage block layout qualifier is supported "
6036 "only for shader storage blocks");
6039 /* The ast_interface_block has a list of ast_declarator_lists. We
6040 * need to turn those into ir_variables with an association
6041 * with this uniform block.
6043 enum glsl_interface_packing packing
;
6044 if (this->layout
.flags
.q
.shared
) {
6045 packing
= GLSL_INTERFACE_PACKING_SHARED
;
6046 } else if (this->layout
.flags
.q
.packed
) {
6047 packing
= GLSL_INTERFACE_PACKING_PACKED
;
6048 } else if (this->layout
.flags
.q
.std430
) {
6049 packing
= GLSL_INTERFACE_PACKING_STD430
;
6051 /* The default layout is std140.
6053 packing
= GLSL_INTERFACE_PACKING_STD140
;
6056 ir_variable_mode var_mode
;
6057 const char *iface_type_name
;
6058 if (this->layout
.flags
.q
.in
) {
6059 var_mode
= ir_var_shader_in
;
6060 iface_type_name
= "in";
6061 } else if (this->layout
.flags
.q
.out
) {
6062 var_mode
= ir_var_shader_out
;
6063 iface_type_name
= "out";
6064 } else if (this->layout
.flags
.q
.uniform
) {
6065 var_mode
= ir_var_uniform
;
6066 iface_type_name
= "uniform";
6067 } else if (this->layout
.flags
.q
.buffer
) {
6068 var_mode
= ir_var_shader_storage
;
6069 iface_type_name
= "buffer";
6071 var_mode
= ir_var_auto
;
6072 iface_type_name
= "UNKNOWN";
6073 assert(!"interface block layout qualifier not found!");
6076 enum glsl_matrix_layout matrix_layout
= GLSL_MATRIX_LAYOUT_INHERITED
;
6077 if (this->layout
.flags
.q
.row_major
)
6078 matrix_layout
= GLSL_MATRIX_LAYOUT_ROW_MAJOR
;
6079 else if (this->layout
.flags
.q
.column_major
)
6080 matrix_layout
= GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
;
6082 bool redeclaring_per_vertex
= strcmp(this->block_name
, "gl_PerVertex") == 0;
6083 exec_list declared_variables
;
6084 glsl_struct_field
*fields
;
6086 /* Treat an interface block as one level of nesting, so that embedded struct
6087 * specifiers will be disallowed.
6089 state
->struct_specifier_depth
++;
6091 unsigned int num_variables
=
6092 ast_process_structure_or_interface_block(&declared_variables
,
6094 &this->declarations
,
6099 redeclaring_per_vertex
,
6103 state
->struct_specifier_depth
--;
6105 if (!redeclaring_per_vertex
) {
6106 validate_identifier(this->block_name
, loc
, state
);
6108 /* From section 4.3.9 ("Interface Blocks") of the GLSL 4.50 spec:
6110 * "Block names have no other use within a shader beyond interface
6111 * matching; it is a compile-time error to use a block name at global
6112 * scope for anything other than as a block name."
6114 ir_variable
*var
= state
->symbols
->get_variable(this->block_name
);
6115 if (var
&& !var
->type
->is_interface()) {
6116 _mesa_glsl_error(&loc
, state
, "Block name `%s' is "
6117 "already used in the scope.",
6122 const glsl_type
*earlier_per_vertex
= NULL
;
6123 if (redeclaring_per_vertex
) {
6124 /* Find the previous declaration of gl_PerVertex. If we're redeclaring
6125 * the named interface block gl_in, we can find it by looking at the
6126 * previous declaration of gl_in. Otherwise we can find it by looking
6127 * at the previous decalartion of any of the built-in outputs,
6130 * Also check that the instance name and array-ness of the redeclaration
6134 case ir_var_shader_in
:
6135 if (ir_variable
*earlier_gl_in
=
6136 state
->symbols
->get_variable("gl_in")) {
6137 earlier_per_vertex
= earlier_gl_in
->get_interface_type();
6139 _mesa_glsl_error(&loc
, state
,
6140 "redeclaration of gl_PerVertex input not allowed "
6142 _mesa_shader_stage_to_string(state
->stage
));
6144 if (this->instance_name
== NULL
||
6145 strcmp(this->instance_name
, "gl_in") != 0 || this->array_specifier
== NULL
) {
6146 _mesa_glsl_error(&loc
, state
,
6147 "gl_PerVertex input must be redeclared as "
6151 case ir_var_shader_out
:
6152 if (ir_variable
*earlier_gl_Position
=
6153 state
->symbols
->get_variable("gl_Position")) {
6154 earlier_per_vertex
= earlier_gl_Position
->get_interface_type();
6155 } else if (ir_variable
*earlier_gl_out
=
6156 state
->symbols
->get_variable("gl_out")) {
6157 earlier_per_vertex
= earlier_gl_out
->get_interface_type();
6159 _mesa_glsl_error(&loc
, state
,
6160 "redeclaration of gl_PerVertex output not "
6161 "allowed in the %s shader",
6162 _mesa_shader_stage_to_string(state
->stage
));
6164 if (state
->stage
== MESA_SHADER_TESS_CTRL
) {
6165 if (this->instance_name
== NULL
||
6166 strcmp(this->instance_name
, "gl_out") != 0 || this->array_specifier
== NULL
) {
6167 _mesa_glsl_error(&loc
, state
,
6168 "gl_PerVertex output must be redeclared as "
6172 if (this->instance_name
!= NULL
) {
6173 _mesa_glsl_error(&loc
, state
,
6174 "gl_PerVertex output may not be redeclared with "
6175 "an instance name");
6180 _mesa_glsl_error(&loc
, state
,
6181 "gl_PerVertex must be declared as an input or an "
6186 if (earlier_per_vertex
== NULL
) {
6187 /* An error has already been reported. Bail out to avoid null
6188 * dereferences later in this function.
6193 /* Copy locations from the old gl_PerVertex interface block. */
6194 for (unsigned i
= 0; i
< num_variables
; i
++) {
6195 int j
= earlier_per_vertex
->field_index(fields
[i
].name
);
6197 _mesa_glsl_error(&loc
, state
,
6198 "redeclaration of gl_PerVertex must be a subset "
6199 "of the built-in members of gl_PerVertex");
6201 fields
[i
].location
=
6202 earlier_per_vertex
->fields
.structure
[j
].location
;
6203 fields
[i
].interpolation
=
6204 earlier_per_vertex
->fields
.structure
[j
].interpolation
;
6205 fields
[i
].centroid
=
6206 earlier_per_vertex
->fields
.structure
[j
].centroid
;
6208 earlier_per_vertex
->fields
.structure
[j
].sample
;
6210 earlier_per_vertex
->fields
.structure
[j
].patch
;
6214 /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10
6217 * If a built-in interface block is redeclared, it must appear in
6218 * the shader before any use of any member included in the built-in
6219 * declaration, or a compilation error will result.
6221 * This appears to be a clarification to the behaviour established for
6222 * gl_PerVertex by GLSL 1.50, therefore we implement this behaviour
6223 * regardless of GLSL version.
6225 interface_block_usage_visitor
v(var_mode
, earlier_per_vertex
);
6226 v
.run(instructions
);
6227 if (v
.usage_found()) {
6228 _mesa_glsl_error(&loc
, state
,
6229 "redeclaration of a built-in interface block must "
6230 "appear before any use of any member of the "
6235 const glsl_type
*block_type
=
6236 glsl_type::get_interface_instance(fields
,
6240 if (this->layout
.flags
.q
.explicit_binding
)
6241 validate_binding_qualifier(state
, &loc
, block_type
, &this->layout
);
6243 if (!state
->symbols
->add_interface(block_type
->name
, block_type
, var_mode
)) {
6244 YYLTYPE loc
= this->get_location();
6245 _mesa_glsl_error(&loc
, state
, "interface block `%s' with type `%s' "
6246 "already taken in the current scope",
6247 this->block_name
, iface_type_name
);
6250 /* Since interface blocks cannot contain statements, it should be
6251 * impossible for the block to generate any instructions.
6253 assert(declared_variables
.is_empty());
6255 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
6257 * Geometry shader input variables get the per-vertex values written
6258 * out by vertex shader output variables of the same names. Since a
6259 * geometry shader operates on a set of vertices, each input varying
6260 * variable (or input block, see interface blocks below) needs to be
6261 * declared as an array.
6263 if (state
->stage
== MESA_SHADER_GEOMETRY
&& this->array_specifier
== NULL
&&
6264 var_mode
== ir_var_shader_in
) {
6265 _mesa_glsl_error(&loc
, state
, "geometry shader inputs must be arrays");
6266 } else if ((state
->stage
== MESA_SHADER_TESS_CTRL
||
6267 state
->stage
== MESA_SHADER_TESS_EVAL
) &&
6268 this->array_specifier
== NULL
&&
6269 var_mode
== ir_var_shader_in
) {
6270 _mesa_glsl_error(&loc
, state
, "per-vertex tessellation shader inputs must be arrays");
6271 } else if (state
->stage
== MESA_SHADER_TESS_CTRL
&&
6272 this->array_specifier
== NULL
&&
6273 var_mode
== ir_var_shader_out
) {
6274 _mesa_glsl_error(&loc
, state
, "tessellation control shader outputs must be arrays");
6278 /* Page 39 (page 45 of the PDF) of section 4.3.7 in the GLSL ES 3.00 spec
6281 * "If an instance name (instance-name) is used, then it puts all the
6282 * members inside a scope within its own name space, accessed with the
6283 * field selector ( . ) operator (analogously to structures)."
6285 if (this->instance_name
) {
6286 if (redeclaring_per_vertex
) {
6287 /* When a built-in in an unnamed interface block is redeclared,
6288 * get_variable_being_redeclared() calls
6289 * check_builtin_array_max_size() to make sure that built-in array
6290 * variables aren't redeclared to illegal sizes. But we're looking
6291 * at a redeclaration of a named built-in interface block. So we
6292 * have to manually call check_builtin_array_max_size() for all parts
6293 * of the interface that are arrays.
6295 for (unsigned i
= 0; i
< num_variables
; i
++) {
6296 if (fields
[i
].type
->is_array()) {
6297 const unsigned size
= fields
[i
].type
->array_size();
6298 check_builtin_array_max_size(fields
[i
].name
, size
, loc
, state
);
6302 validate_identifier(this->instance_name
, loc
, state
);
6307 if (this->array_specifier
!= NULL
) {
6308 /* Section 4.3.7 (Interface Blocks) of the GLSL 1.50 spec says:
6310 * For uniform blocks declared an array, each individual array
6311 * element corresponds to a separate buffer object backing one
6312 * instance of the block. As the array size indicates the number
6313 * of buffer objects needed, uniform block array declarations
6314 * must specify an array size.
6316 * And a few paragraphs later:
6318 * Geometry shader input blocks must be declared as arrays and
6319 * follow the array declaration and linking rules for all
6320 * geometry shader inputs. All other input and output block
6321 * arrays must specify an array size.
6323 * The same applies to tessellation shaders.
6325 * The upshot of this is that the only circumstance where an
6326 * interface array size *doesn't* need to be specified is on a
6327 * geometry shader input, tessellation control shader input,
6328 * tessellation control shader output, and tessellation evaluation
6331 if (this->array_specifier
->is_unsized_array
) {
6332 bool allow_inputs
= state
->stage
== MESA_SHADER_GEOMETRY
||
6333 state
->stage
== MESA_SHADER_TESS_CTRL
||
6334 state
->stage
== MESA_SHADER_TESS_EVAL
;
6335 bool allow_outputs
= state
->stage
== MESA_SHADER_TESS_CTRL
;
6337 if (this->layout
.flags
.q
.in
) {
6339 _mesa_glsl_error(&loc
, state
,
6340 "unsized input block arrays not allowed in "
6342 _mesa_shader_stage_to_string(state
->stage
));
6343 } else if (this->layout
.flags
.q
.out
) {
6345 _mesa_glsl_error(&loc
, state
,
6346 "unsized output block arrays not allowed in "
6348 _mesa_shader_stage_to_string(state
->stage
));
6350 /* by elimination, this is a uniform block array */
6351 _mesa_glsl_error(&loc
, state
,
6352 "unsized uniform block arrays not allowed in "
6354 _mesa_shader_stage_to_string(state
->stage
));
6358 const glsl_type
*block_array_type
=
6359 process_array_type(&loc
, block_type
, this->array_specifier
, state
);
6361 /* From section 4.3.9 (Interface Blocks) of the GLSL ES 3.10 spec:
6363 * * Arrays of arrays of blocks are not allowed
6365 if (state
->es_shader
&& block_array_type
->is_array() &&
6366 block_array_type
->fields
.array
->is_array()) {
6367 _mesa_glsl_error(&loc
, state
,
6368 "arrays of arrays interface blocks are "
6372 if (this->layout
.flags
.q
.explicit_binding
)
6373 validate_binding_qualifier(state
, &loc
, block_array_type
,
6376 var
= new(state
) ir_variable(block_array_type
,
6377 this->instance_name
,
6380 var
= new(state
) ir_variable(block_type
,
6381 this->instance_name
,
6385 var
->data
.matrix_layout
= matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
6386 ? GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
: matrix_layout
;
6388 if (var_mode
== ir_var_shader_in
|| var_mode
== ir_var_uniform
)
6389 var
->data
.read_only
= true;
6391 if (state
->stage
== MESA_SHADER_GEOMETRY
&& var_mode
== ir_var_shader_in
)
6392 handle_geometry_shader_input_decl(state
, loc
, var
);
6393 else if ((state
->stage
== MESA_SHADER_TESS_CTRL
||
6394 state
->stage
== MESA_SHADER_TESS_EVAL
) && var_mode
== ir_var_shader_in
)
6395 handle_tess_shader_input_decl(state
, loc
, var
);
6396 else if (state
->stage
== MESA_SHADER_TESS_CTRL
&& var_mode
== ir_var_shader_out
)
6397 handle_tess_ctrl_shader_output_decl(state
, loc
, var
);
6399 for (unsigned i
= 0; i
< num_variables
; i
++) {
6400 if (fields
[i
].type
->is_unsized_array()) {
6401 if (var_mode
== ir_var_shader_storage
) {
6402 if (i
!= (num_variables
- 1)) {
6403 _mesa_glsl_error(&loc
, state
, "unsized array `%s' definition: "
6404 "only last member of a shader storage block "
6405 "can be defined as unsized array",
6409 /* From GLSL ES 3.10 spec, section 4.1.9 "Arrays":
6411 * "If an array is declared as the last member of a shader storage
6412 * block and the size is not specified at compile-time, it is
6413 * sized at run-time. In all other cases, arrays are sized only
6416 if (state
->es_shader
) {
6417 _mesa_glsl_error(&loc
, state
, "unsized array `%s' definition: "
6418 "only last member of a shader storage block "
6419 "can be defined as unsized array",
6426 if (ir_variable
*earlier
=
6427 state
->symbols
->get_variable(this->instance_name
)) {
6428 if (!redeclaring_per_vertex
) {
6429 _mesa_glsl_error(&loc
, state
, "`%s' redeclared",
6430 this->instance_name
);
6432 earlier
->data
.how_declared
= ir_var_declared_normally
;
6433 earlier
->type
= var
->type
;
6434 earlier
->reinit_interface_type(block_type
);
6437 /* Propagate the "binding" keyword into this UBO's fields;
6438 * the UBO declaration itself doesn't get an ir_variable unless it
6439 * has an instance name. This is ugly.
6441 var
->data
.explicit_binding
= this->layout
.flags
.q
.explicit_binding
;
6442 var
->data
.binding
= this->layout
.binding
;
6444 state
->symbols
->add_variable(var
);
6445 instructions
->push_tail(var
);
6448 /* In order to have an array size, the block must also be declared with
6451 assert(this->array_specifier
== NULL
);
6453 for (unsigned i
= 0; i
< num_variables
; i
++) {
6455 new(state
) ir_variable(fields
[i
].type
,
6456 ralloc_strdup(state
, fields
[i
].name
),
6458 var
->data
.interpolation
= fields
[i
].interpolation
;
6459 var
->data
.centroid
= fields
[i
].centroid
;
6460 var
->data
.sample
= fields
[i
].sample
;
6461 var
->data
.patch
= fields
[i
].patch
;
6462 var
->init_interface_type(block_type
);
6464 if (var_mode
== ir_var_shader_in
|| var_mode
== ir_var_uniform
)
6465 var
->data
.read_only
= true;
6467 if (fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
) {
6468 var
->data
.matrix_layout
= matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
6469 ? GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
: matrix_layout
;
6471 var
->data
.matrix_layout
= fields
[i
].matrix_layout
;
6474 if (fields
[i
].stream
!= -1 &&
6475 ((unsigned)fields
[i
].stream
) != this->layout
.stream
) {
6476 _mesa_glsl_error(&loc
, state
,
6477 "stream layout qualifier on "
6478 "interface block member `%s' does not match "
6479 "the interface block (%d vs %d)",
6480 var
->name
, fields
[i
].stream
, this->layout
.stream
);
6483 var
->data
.stream
= this->layout
.stream
;
6485 if (var
->data
.mode
== ir_var_shader_storage
) {
6486 var
->data
.image_read_only
= fields
[i
].image_read_only
;
6487 var
->data
.image_write_only
= fields
[i
].image_write_only
;
6488 var
->data
.image_coherent
= fields
[i
].image_coherent
;
6489 var
->data
.image_volatile
= fields
[i
].image_volatile
;
6490 var
->data
.image_restrict
= fields
[i
].image_restrict
;
6493 /* Examine var name here since var may get deleted in the next call */
6494 bool var_is_gl_id
= is_gl_identifier(var
->name
);
6496 if (redeclaring_per_vertex
) {
6497 ir_variable
*earlier
=
6498 get_variable_being_redeclared(var
, loc
, state
,
6499 true /* allow_all_redeclarations */);
6500 if (!var_is_gl_id
|| earlier
== NULL
) {
6501 _mesa_glsl_error(&loc
, state
,
6502 "redeclaration of gl_PerVertex can only "
6503 "include built-in variables");
6504 } else if (earlier
->data
.how_declared
== ir_var_declared_normally
) {
6505 _mesa_glsl_error(&loc
, state
,
6506 "`%s' has already been redeclared",
6509 earlier
->data
.how_declared
= ir_var_declared_in_block
;
6510 earlier
->reinit_interface_type(block_type
);
6515 if (state
->symbols
->get_variable(var
->name
) != NULL
)
6516 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", var
->name
);
6518 /* Propagate the "binding" keyword into this UBO/SSBO's fields.
6519 * The UBO declaration itself doesn't get an ir_variable unless it
6520 * has an instance name. This is ugly.
6522 var
->data
.explicit_binding
= this->layout
.flags
.q
.explicit_binding
;
6523 var
->data
.binding
= this->layout
.binding
;
6525 if (var
->type
->is_unsized_array()) {
6526 if (var
->is_in_shader_storage_block()) {
6527 if (!is_unsized_array_last_element(var
)) {
6528 _mesa_glsl_error(&loc
, state
, "unsized array `%s' definition: "
6529 "only last member of a shader storage block "
6530 "can be defined as unsized array",
6533 var
->data
.from_ssbo_unsized_array
= true;
6535 /* From GLSL ES 3.10 spec, section 4.1.9 "Arrays":
6537 * "If an array is declared as the last member of a shader storage
6538 * block and the size is not specified at compile-time, it is
6539 * sized at run-time. In all other cases, arrays are sized only
6542 if (state
->es_shader
) {
6543 _mesa_glsl_error(&loc
, state
, "unsized array `%s' definition: "
6544 "only last member of a shader storage block "
6545 "can be defined as unsized array",
6551 state
->symbols
->add_variable(var
);
6552 instructions
->push_tail(var
);
6555 if (redeclaring_per_vertex
&& block_type
!= earlier_per_vertex
) {
6556 /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10 spec:
6558 * It is also a compilation error ... to redeclare a built-in
6559 * block and then use a member from that built-in block that was
6560 * not included in the redeclaration.
6562 * This appears to be a clarification to the behaviour established
6563 * for gl_PerVertex by GLSL 1.50, therefore we implement this
6564 * behaviour regardless of GLSL version.
6566 * To prevent the shader from using a member that was not included in
6567 * the redeclaration, we disable any ir_variables that are still
6568 * associated with the old declaration of gl_PerVertex (since we've
6569 * already updated all of the variables contained in the new
6570 * gl_PerVertex to point to it).
6572 * As a side effect this will prevent
6573 * validate_intrastage_interface_blocks() from getting confused and
6574 * thinking there are conflicting definitions of gl_PerVertex in the
6577 foreach_in_list_safe(ir_instruction
, node
, instructions
) {
6578 ir_variable
*const var
= node
->as_variable();
6580 var
->get_interface_type() == earlier_per_vertex
&&
6581 var
->data
.mode
== var_mode
) {
6582 if (var
->data
.how_declared
== ir_var_declared_normally
) {
6583 _mesa_glsl_error(&loc
, state
,
6584 "redeclaration of gl_PerVertex cannot "
6585 "follow a redeclaration of `%s'",
6588 state
->symbols
->disable_variable(var
->name
);
6600 ast_tcs_output_layout::hir(exec_list
*instructions
,
6601 struct _mesa_glsl_parse_state
*state
)
6603 YYLTYPE loc
= this->get_location();
6605 /* If any tessellation control output layout declaration preceded this
6606 * one, make sure it was consistent with this one.
6608 if (state
->tcs_output_vertices_specified
&&
6609 state
->out_qualifier
->vertices
!= this->vertices
) {
6610 _mesa_glsl_error(&loc
, state
,
6611 "tessellation control shader output layout does not "
6612 "match previous declaration");
6616 /* If any shader outputs occurred before this declaration and specified an
6617 * array size, make sure the size they specified is consistent with the
6620 unsigned num_vertices
= this->vertices
;
6621 if (state
->tcs_output_size
!= 0 && state
->tcs_output_size
!= num_vertices
) {
6622 _mesa_glsl_error(&loc
, state
,
6623 "this tessellation control shader output layout "
6624 "specifies %u vertices, but a previous output "
6625 "is declared with size %u",
6626 num_vertices
, state
->tcs_output_size
);
6630 state
->tcs_output_vertices_specified
= true;
6632 /* If any shader outputs occurred before this declaration and did not
6633 * specify an array size, their size is determined now.
6635 foreach_in_list (ir_instruction
, node
, instructions
) {
6636 ir_variable
*var
= node
->as_variable();
6637 if (var
== NULL
|| var
->data
.mode
!= ir_var_shader_out
)
6640 /* Note: Not all tessellation control shader output are arrays. */
6641 if (!var
->type
->is_unsized_array() || var
->data
.patch
)
6644 if (var
->data
.max_array_access
>= num_vertices
) {
6645 _mesa_glsl_error(&loc
, state
,
6646 "this tessellation control shader output layout "
6647 "specifies %u vertices, but an access to element "
6648 "%u of output `%s' already exists", num_vertices
,
6649 var
->data
.max_array_access
, var
->name
);
6651 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
6661 ast_gs_input_layout::hir(exec_list
*instructions
,
6662 struct _mesa_glsl_parse_state
*state
)
6664 YYLTYPE loc
= this->get_location();
6666 /* If any geometry input layout declaration preceded this one, make sure it
6667 * was consistent with this one.
6669 if (state
->gs_input_prim_type_specified
&&
6670 state
->in_qualifier
->prim_type
!= this->prim_type
) {
6671 _mesa_glsl_error(&loc
, state
,
6672 "geometry shader input layout does not match"
6673 " previous declaration");
6677 /* If any shader inputs occurred before this declaration and specified an
6678 * array size, make sure the size they specified is consistent with the
6681 unsigned num_vertices
= vertices_per_prim(this->prim_type
);
6682 if (state
->gs_input_size
!= 0 && state
->gs_input_size
!= num_vertices
) {
6683 _mesa_glsl_error(&loc
, state
,
6684 "this geometry shader input layout implies %u vertices"
6685 " per primitive, but a previous input is declared"
6686 " with size %u", num_vertices
, state
->gs_input_size
);
6690 state
->gs_input_prim_type_specified
= true;
6692 /* If any shader inputs occurred before this declaration and did not
6693 * specify an array size, their size is determined now.
6695 foreach_in_list(ir_instruction
, node
, instructions
) {
6696 ir_variable
*var
= node
->as_variable();
6697 if (var
== NULL
|| var
->data
.mode
!= ir_var_shader_in
)
6700 /* Note: gl_PrimitiveIDIn has mode ir_var_shader_in, but it's not an
6704 if (var
->type
->is_unsized_array()) {
6705 if (var
->data
.max_array_access
>= num_vertices
) {
6706 _mesa_glsl_error(&loc
, state
,
6707 "this geometry shader input layout implies %u"
6708 " vertices, but an access to element %u of input"
6709 " `%s' already exists", num_vertices
,
6710 var
->data
.max_array_access
, var
->name
);
6712 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
6723 ast_cs_input_layout::hir(exec_list
*instructions
,
6724 struct _mesa_glsl_parse_state
*state
)
6726 YYLTYPE loc
= this->get_location();
6728 /* If any compute input layout declaration preceded this one, make sure it
6729 * was consistent with this one.
6731 if (state
->cs_input_local_size_specified
) {
6732 for (int i
= 0; i
< 3; i
++) {
6733 if (state
->cs_input_local_size
[i
] != this->local_size
[i
]) {
6734 _mesa_glsl_error(&loc
, state
,
6735 "compute shader input layout does not match"
6736 " previous declaration");
6742 /* From the ARB_compute_shader specification:
6744 * If the local size of the shader in any dimension is greater
6745 * than the maximum size supported by the implementation for that
6746 * dimension, a compile-time error results.
6748 * It is not clear from the spec how the error should be reported if
6749 * the total size of the work group exceeds
6750 * MAX_COMPUTE_WORK_GROUP_INVOCATIONS, but it seems reasonable to
6751 * report it at compile time as well.
6753 GLuint64 total_invocations
= 1;
6754 for (int i
= 0; i
< 3; i
++) {
6755 if (this->local_size
[i
] > state
->ctx
->Const
.MaxComputeWorkGroupSize
[i
]) {
6756 _mesa_glsl_error(&loc
, state
,
6757 "local_size_%c exceeds MAX_COMPUTE_WORK_GROUP_SIZE"
6759 state
->ctx
->Const
.MaxComputeWorkGroupSize
[i
]);
6762 total_invocations
*= this->local_size
[i
];
6763 if (total_invocations
>
6764 state
->ctx
->Const
.MaxComputeWorkGroupInvocations
) {
6765 _mesa_glsl_error(&loc
, state
,
6766 "product of local_sizes exceeds "
6767 "MAX_COMPUTE_WORK_GROUP_INVOCATIONS (%d)",
6768 state
->ctx
->Const
.MaxComputeWorkGroupInvocations
);
6773 state
->cs_input_local_size_specified
= true;
6774 for (int i
= 0; i
< 3; i
++)
6775 state
->cs_input_local_size
[i
] = this->local_size
[i
];
6777 /* We may now declare the built-in constant gl_WorkGroupSize (see
6778 * builtin_variable_generator::generate_constants() for why we didn't
6779 * declare it earlier).
6781 ir_variable
*var
= new(state
->symbols
)
6782 ir_variable(glsl_type::uvec3_type
, "gl_WorkGroupSize", ir_var_auto
);
6783 var
->data
.how_declared
= ir_var_declared_implicitly
;
6784 var
->data
.read_only
= true;
6785 instructions
->push_tail(var
);
6786 state
->symbols
->add_variable(var
);
6787 ir_constant_data data
;
6788 memset(&data
, 0, sizeof(data
));
6789 for (int i
= 0; i
< 3; i
++)
6790 data
.u
[i
] = this->local_size
[i
];
6791 var
->constant_value
= new(var
) ir_constant(glsl_type::uvec3_type
, &data
);
6792 var
->constant_initializer
=
6793 new(var
) ir_constant(glsl_type::uvec3_type
, &data
);
6794 var
->data
.has_initializer
= true;
6801 detect_conflicting_assignments(struct _mesa_glsl_parse_state
*state
,
6802 exec_list
*instructions
)
6804 bool gl_FragColor_assigned
= false;
6805 bool gl_FragData_assigned
= false;
6806 bool user_defined_fs_output_assigned
= false;
6807 ir_variable
*user_defined_fs_output
= NULL
;
6809 /* It would be nice to have proper location information. */
6811 memset(&loc
, 0, sizeof(loc
));
6813 foreach_in_list(ir_instruction
, node
, instructions
) {
6814 ir_variable
*var
= node
->as_variable();
6816 if (!var
|| !var
->data
.assigned
)
6819 if (strcmp(var
->name
, "gl_FragColor") == 0)
6820 gl_FragColor_assigned
= true;
6821 else if (strcmp(var
->name
, "gl_FragData") == 0)
6822 gl_FragData_assigned
= true;
6823 else if (!is_gl_identifier(var
->name
)) {
6824 if (state
->stage
== MESA_SHADER_FRAGMENT
&&
6825 var
->data
.mode
== ir_var_shader_out
) {
6826 user_defined_fs_output_assigned
= true;
6827 user_defined_fs_output
= var
;
6832 /* From the GLSL 1.30 spec:
6834 * "If a shader statically assigns a value to gl_FragColor, it
6835 * may not assign a value to any element of gl_FragData. If a
6836 * shader statically writes a value to any element of
6837 * gl_FragData, it may not assign a value to
6838 * gl_FragColor. That is, a shader may assign values to either
6839 * gl_FragColor or gl_FragData, but not both. Multiple shaders
6840 * linked together must also consistently write just one of
6841 * these variables. Similarly, if user declared output
6842 * variables are in use (statically assigned to), then the
6843 * built-in variables gl_FragColor and gl_FragData may not be
6844 * assigned to. These incorrect usages all generate compile
6847 if (gl_FragColor_assigned
&& gl_FragData_assigned
) {
6848 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
6849 "`gl_FragColor' and `gl_FragData'");
6850 } else if (gl_FragColor_assigned
&& user_defined_fs_output_assigned
) {
6851 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
6852 "`gl_FragColor' and `%s'",
6853 user_defined_fs_output
->name
);
6854 } else if (gl_FragData_assigned
&& user_defined_fs_output_assigned
) {
6855 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
6856 "`gl_FragData' and `%s'",
6857 user_defined_fs_output
->name
);
6863 remove_per_vertex_blocks(exec_list
*instructions
,
6864 _mesa_glsl_parse_state
*state
, ir_variable_mode mode
)
6866 /* Find the gl_PerVertex interface block of the appropriate (in/out) mode,
6867 * if it exists in this shader type.
6869 const glsl_type
*per_vertex
= NULL
;
6871 case ir_var_shader_in
:
6872 if (ir_variable
*gl_in
= state
->symbols
->get_variable("gl_in"))
6873 per_vertex
= gl_in
->get_interface_type();
6875 case ir_var_shader_out
:
6876 if (ir_variable
*gl_Position
=
6877 state
->symbols
->get_variable("gl_Position")) {
6878 per_vertex
= gl_Position
->get_interface_type();
6882 assert(!"Unexpected mode");
6886 /* If we didn't find a built-in gl_PerVertex interface block, then we don't
6887 * need to do anything.
6889 if (per_vertex
== NULL
)
6892 /* If the interface block is used by the shader, then we don't need to do
6895 interface_block_usage_visitor
v(mode
, per_vertex
);
6896 v
.run(instructions
);
6897 if (v
.usage_found())
6900 /* Remove any ir_variable declarations that refer to the interface block
6903 foreach_in_list_safe(ir_instruction
, node
, instructions
) {
6904 ir_variable
*const var
= node
->as_variable();
6905 if (var
!= NULL
&& var
->get_interface_type() == per_vertex
&&
6906 var
->data
.mode
== mode
) {
6907 state
->symbols
->disable_variable(var
->name
);