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_ATOMIC_UINT
:
1088 case GLSL_TYPE_SUBROUTINE
:
1089 /* I assume a comparison of a struct containing a sampler just
1090 * ignores the sampler present in the type.
1096 cmp
= new(mem_ctx
) ir_constant(true);
1101 /* For logical operations, we want to ensure that the operands are
1102 * scalar booleans. If it isn't, emit an error and return a constant
1103 * boolean to avoid triggering cascading error messages.
1106 get_scalar_boolean_operand(exec_list
*instructions
,
1107 struct _mesa_glsl_parse_state
*state
,
1108 ast_expression
*parent_expr
,
1110 const char *operand_name
,
1111 bool *error_emitted
)
1113 ast_expression
*expr
= parent_expr
->subexpressions
[operand
];
1115 ir_rvalue
*val
= expr
->hir(instructions
, state
);
1117 if (val
->type
->is_boolean() && val
->type
->is_scalar())
1120 if (!*error_emitted
) {
1121 YYLTYPE loc
= expr
->get_location();
1122 _mesa_glsl_error(&loc
, state
, "%s of `%s' must be scalar boolean",
1124 parent_expr
->operator_string(parent_expr
->oper
));
1125 *error_emitted
= true;
1128 return new(ctx
) ir_constant(true);
1132 * If name refers to a builtin array whose maximum allowed size is less than
1133 * size, report an error and return true. Otherwise return false.
1136 check_builtin_array_max_size(const char *name
, unsigned size
,
1137 YYLTYPE loc
, struct _mesa_glsl_parse_state
*state
)
1139 if ((strcmp("gl_TexCoord", name
) == 0)
1140 && (size
> state
->Const
.MaxTextureCoords
)) {
1141 /* From page 54 (page 60 of the PDF) of the GLSL 1.20 spec:
1143 * "The size [of gl_TexCoord] can be at most
1144 * gl_MaxTextureCoords."
1146 _mesa_glsl_error(&loc
, state
, "`gl_TexCoord' array size cannot "
1147 "be larger than gl_MaxTextureCoords (%u)",
1148 state
->Const
.MaxTextureCoords
);
1149 } else if (strcmp("gl_ClipDistance", name
) == 0
1150 && size
> state
->Const
.MaxClipPlanes
) {
1151 /* From section 7.1 (Vertex Shader Special Variables) of the
1154 * "The gl_ClipDistance array is predeclared as unsized and
1155 * must be sized by the shader either redeclaring it with a
1156 * size or indexing it only with integral constant
1157 * expressions. ... The size can be at most
1158 * gl_MaxClipDistances."
1160 _mesa_glsl_error(&loc
, state
, "`gl_ClipDistance' array size cannot "
1161 "be larger than gl_MaxClipDistances (%u)",
1162 state
->Const
.MaxClipPlanes
);
1167 * Create the constant 1, of a which is appropriate for incrementing and
1168 * decrementing values of the given GLSL type. For example, if type is vec4,
1169 * this creates a constant value of 1.0 having type float.
1171 * If the given type is invalid for increment and decrement operators, return
1172 * a floating point 1--the error will be detected later.
1175 constant_one_for_inc_dec(void *ctx
, const glsl_type
*type
)
1177 switch (type
->base_type
) {
1178 case GLSL_TYPE_UINT
:
1179 return new(ctx
) ir_constant((unsigned) 1);
1181 return new(ctx
) ir_constant(1);
1183 case GLSL_TYPE_FLOAT
:
1184 return new(ctx
) ir_constant(1.0f
);
1189 ast_expression::hir(exec_list
*instructions
,
1190 struct _mesa_glsl_parse_state
*state
)
1192 return do_hir(instructions
, state
, true);
1196 ast_expression::hir_no_rvalue(exec_list
*instructions
,
1197 struct _mesa_glsl_parse_state
*state
)
1199 do_hir(instructions
, state
, false);
1203 ast_expression::do_hir(exec_list
*instructions
,
1204 struct _mesa_glsl_parse_state
*state
,
1208 static const int operations
[AST_NUM_OPERATORS
] = {
1209 -1, /* ast_assign doesn't convert to ir_expression. */
1210 -1, /* ast_plus doesn't convert to ir_expression. */
1224 ir_binop_any_nequal
,
1234 /* Note: The following block of expression types actually convert
1235 * to multiple IR instructions.
1237 ir_binop_mul
, /* ast_mul_assign */
1238 ir_binop_div
, /* ast_div_assign */
1239 ir_binop_mod
, /* ast_mod_assign */
1240 ir_binop_add
, /* ast_add_assign */
1241 ir_binop_sub
, /* ast_sub_assign */
1242 ir_binop_lshift
, /* ast_ls_assign */
1243 ir_binop_rshift
, /* ast_rs_assign */
1244 ir_binop_bit_and
, /* ast_and_assign */
1245 ir_binop_bit_xor
, /* ast_xor_assign */
1246 ir_binop_bit_or
, /* ast_or_assign */
1248 -1, /* ast_conditional doesn't convert to ir_expression. */
1249 ir_binop_add
, /* ast_pre_inc. */
1250 ir_binop_sub
, /* ast_pre_dec. */
1251 ir_binop_add
, /* ast_post_inc. */
1252 ir_binop_sub
, /* ast_post_dec. */
1253 -1, /* ast_field_selection doesn't conv to ir_expression. */
1254 -1, /* ast_array_index doesn't convert to ir_expression. */
1255 -1, /* ast_function_call doesn't conv to ir_expression. */
1256 -1, /* ast_identifier doesn't convert to ir_expression. */
1257 -1, /* ast_int_constant doesn't convert to ir_expression. */
1258 -1, /* ast_uint_constant doesn't conv to ir_expression. */
1259 -1, /* ast_float_constant doesn't conv to ir_expression. */
1260 -1, /* ast_bool_constant doesn't conv to ir_expression. */
1261 -1, /* ast_sequence doesn't convert to ir_expression. */
1263 ir_rvalue
*result
= NULL
;
1265 const struct glsl_type
*type
; /* a temporary variable for switch cases */
1266 bool error_emitted
= false;
1269 loc
= this->get_location();
1271 switch (this->oper
) {
1273 assert(!"ast_aggregate: Should never get here.");
1277 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1278 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1281 do_assignment(instructions
, state
,
1282 this->subexpressions
[0]->non_lvalue_description
,
1283 op
[0], op
[1], &result
, needs_rvalue
, false,
1284 this->subexpressions
[0]->get_location());
1289 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1291 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1293 error_emitted
= type
->is_error();
1299 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1301 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1303 error_emitted
= type
->is_error();
1305 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1313 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1314 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1316 type
= arithmetic_result_type(op
[0], op
[1],
1317 (this->oper
== ast_mul
),
1319 error_emitted
= type
->is_error();
1321 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1326 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1327 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1329 type
= modulus_result_type(op
[0]->type
, op
[1]->type
, state
, & loc
);
1331 assert(operations
[this->oper
] == ir_binop_mod
);
1333 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1335 error_emitted
= type
->is_error();
1340 if (!state
->check_bitwise_operations_allowed(&loc
)) {
1341 error_emitted
= true;
1344 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1345 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1346 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1348 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1350 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1357 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1358 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1360 type
= relational_result_type(op
[0], op
[1], state
, & loc
);
1362 /* The relational operators must either generate an error or result
1363 * in a scalar boolean. See page 57 of the GLSL 1.50 spec.
1365 assert(type
->is_error()
1366 || ((type
->base_type
== GLSL_TYPE_BOOL
)
1367 && type
->is_scalar()));
1369 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1371 error_emitted
= type
->is_error();
1376 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1377 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1379 /* From page 58 (page 64 of the PDF) of the GLSL 1.50 spec:
1381 * "The equality operators equal (==), and not equal (!=)
1382 * operate on all types. They result in a scalar Boolean. If
1383 * the operand types do not match, then there must be a
1384 * conversion from Section 4.1.10 "Implicit Conversions"
1385 * applied to one operand that can make them match, in which
1386 * case this conversion is done."
1389 if (op
[0]->type
== glsl_type::void_type
|| op
[1]->type
== glsl_type::void_type
) {
1390 _mesa_glsl_error(& loc
, state
, "`%s': wrong operand types: "
1391 "no operation `%1$s' exists that takes a left-hand "
1392 "operand of type 'void' or a right operand of type "
1393 "'void'", (this->oper
== ast_equal
) ? "==" : "!=");
1394 error_emitted
= true;
1395 } else if ((!apply_implicit_conversion(op
[0]->type
, op
[1], state
)
1396 && !apply_implicit_conversion(op
[1]->type
, op
[0], state
))
1397 || (op
[0]->type
!= op
[1]->type
)) {
1398 _mesa_glsl_error(& loc
, state
, "operands of `%s' must have the same "
1399 "type", (this->oper
== ast_equal
) ? "==" : "!=");
1400 error_emitted
= true;
1401 } else if ((op
[0]->type
->is_array() || op
[1]->type
->is_array()) &&
1402 !state
->check_version(120, 300, &loc
,
1403 "array comparisons forbidden")) {
1404 error_emitted
= true;
1405 } else if ((op
[0]->type
->contains_opaque() ||
1406 op
[1]->type
->contains_opaque())) {
1407 _mesa_glsl_error(&loc
, state
, "opaque type comparisons forbidden");
1408 error_emitted
= true;
1411 if (error_emitted
) {
1412 result
= new(ctx
) ir_constant(false);
1414 result
= do_comparison(ctx
, operations
[this->oper
], op
[0], op
[1]);
1415 assert(result
->type
== glsl_type::bool_type
);
1422 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1423 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1424 type
= bit_logic_result_type(op
[0]->type
, op
[1]->type
, this->oper
,
1426 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1428 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1432 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1434 if (!state
->check_bitwise_operations_allowed(&loc
)) {
1435 error_emitted
= true;
1438 if (!op
[0]->type
->is_integer()) {
1439 _mesa_glsl_error(&loc
, state
, "operand of `~' must be an integer");
1440 error_emitted
= true;
1443 type
= error_emitted
? glsl_type::error_type
: op
[0]->type
;
1444 result
= new(ctx
) ir_expression(ir_unop_bit_not
, type
, op
[0], NULL
);
1447 case ast_logic_and
: {
1448 exec_list rhs_instructions
;
1449 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1450 "LHS", &error_emitted
);
1451 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1452 "RHS", &error_emitted
);
1454 if (rhs_instructions
.is_empty()) {
1455 result
= new(ctx
) ir_expression(ir_binop_logic_and
, op
[0], op
[1]);
1456 type
= result
->type
;
1458 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1461 instructions
->push_tail(tmp
);
1463 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1464 instructions
->push_tail(stmt
);
1466 stmt
->then_instructions
.append_list(&rhs_instructions
);
1467 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1468 ir_assignment
*const then_assign
=
1469 new(ctx
) ir_assignment(then_deref
, op
[1]);
1470 stmt
->then_instructions
.push_tail(then_assign
);
1472 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1473 ir_assignment
*const else_assign
=
1474 new(ctx
) ir_assignment(else_deref
, new(ctx
) ir_constant(false));
1475 stmt
->else_instructions
.push_tail(else_assign
);
1477 result
= new(ctx
) ir_dereference_variable(tmp
);
1483 case ast_logic_or
: {
1484 exec_list rhs_instructions
;
1485 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1486 "LHS", &error_emitted
);
1487 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1488 "RHS", &error_emitted
);
1490 if (rhs_instructions
.is_empty()) {
1491 result
= new(ctx
) ir_expression(ir_binop_logic_or
, op
[0], op
[1]);
1492 type
= result
->type
;
1494 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1497 instructions
->push_tail(tmp
);
1499 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1500 instructions
->push_tail(stmt
);
1502 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1503 ir_assignment
*const then_assign
=
1504 new(ctx
) ir_assignment(then_deref
, new(ctx
) ir_constant(true));
1505 stmt
->then_instructions
.push_tail(then_assign
);
1507 stmt
->else_instructions
.append_list(&rhs_instructions
);
1508 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1509 ir_assignment
*const else_assign
=
1510 new(ctx
) ir_assignment(else_deref
, op
[1]);
1511 stmt
->else_instructions
.push_tail(else_assign
);
1513 result
= new(ctx
) ir_dereference_variable(tmp
);
1520 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1522 * "The logical binary operators and (&&), or ( | | ), and
1523 * exclusive or (^^). They operate only on two Boolean
1524 * expressions and result in a Boolean expression."
1526 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0, "LHS",
1528 op
[1] = get_scalar_boolean_operand(instructions
, state
, this, 1, "RHS",
1531 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1536 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1537 "operand", &error_emitted
);
1539 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1543 case ast_mul_assign
:
1544 case ast_div_assign
:
1545 case ast_add_assign
:
1546 case ast_sub_assign
: {
1547 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1548 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1550 type
= arithmetic_result_type(op
[0], op
[1],
1551 (this->oper
== ast_mul_assign
),
1554 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1558 do_assignment(instructions
, state
,
1559 this->subexpressions
[0]->non_lvalue_description
,
1560 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1561 &result
, needs_rvalue
, false,
1562 this->subexpressions
[0]->get_location());
1564 /* GLSL 1.10 does not allow array assignment. However, we don't have to
1565 * explicitly test for this because none of the binary expression
1566 * operators allow array operands either.
1572 case ast_mod_assign
: {
1573 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1574 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1576 type
= modulus_result_type(op
[0]->type
, op
[1]->type
, state
, & loc
);
1578 assert(operations
[this->oper
] == ir_binop_mod
);
1580 ir_rvalue
*temp_rhs
;
1581 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1585 do_assignment(instructions
, state
,
1586 this->subexpressions
[0]->non_lvalue_description
,
1587 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1588 &result
, needs_rvalue
, false,
1589 this->subexpressions
[0]->get_location());
1594 case ast_rs_assign
: {
1595 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1596 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1597 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1599 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1600 type
, op
[0], op
[1]);
1602 do_assignment(instructions
, state
,
1603 this->subexpressions
[0]->non_lvalue_description
,
1604 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1605 &result
, needs_rvalue
, false,
1606 this->subexpressions
[0]->get_location());
1610 case ast_and_assign
:
1611 case ast_xor_assign
:
1612 case ast_or_assign
: {
1613 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1614 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1615 type
= bit_logic_result_type(op
[0]->type
, op
[1]->type
, this->oper
,
1617 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1618 type
, op
[0], op
[1]);
1620 do_assignment(instructions
, state
,
1621 this->subexpressions
[0]->non_lvalue_description
,
1622 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1623 &result
, needs_rvalue
, false,
1624 this->subexpressions
[0]->get_location());
1628 case ast_conditional
: {
1629 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1631 * "The ternary selection operator (?:). It operates on three
1632 * expressions (exp1 ? exp2 : exp3). This operator evaluates the
1633 * first expression, which must result in a scalar Boolean."
1635 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1636 "condition", &error_emitted
);
1638 /* The :? operator is implemented by generating an anonymous temporary
1639 * followed by an if-statement. The last instruction in each branch of
1640 * the if-statement assigns a value to the anonymous temporary. This
1641 * temporary is the r-value of the expression.
1643 exec_list then_instructions
;
1644 exec_list else_instructions
;
1646 op
[1] = this->subexpressions
[1]->hir(&then_instructions
, state
);
1647 op
[2] = this->subexpressions
[2]->hir(&else_instructions
, state
);
1649 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1651 * "The second and third expressions can be any type, as
1652 * long their types match, or there is a conversion in
1653 * Section 4.1.10 "Implicit Conversions" that can be applied
1654 * to one of the expressions to make their types match. This
1655 * resulting matching type is the type of the entire
1658 if ((!apply_implicit_conversion(op
[1]->type
, op
[2], state
)
1659 && !apply_implicit_conversion(op
[2]->type
, op
[1], state
))
1660 || (op
[1]->type
!= op
[2]->type
)) {
1661 YYLTYPE loc
= this->subexpressions
[1]->get_location();
1663 _mesa_glsl_error(& loc
, state
, "second and third operands of ?: "
1664 "operator must have matching types");
1665 error_emitted
= true;
1666 type
= glsl_type::error_type
;
1671 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1673 * "The second and third expressions must be the same type, but can
1674 * be of any type other than an array."
1676 if (type
->is_array() &&
1677 !state
->check_version(120, 300, &loc
,
1678 "second and third operands of ?: operator "
1679 "cannot be arrays")) {
1680 error_emitted
= true;
1683 /* From section 4.1.7 of the GLSL 4.50 spec (Opaque Types):
1685 * "Except for array indexing, structure member selection, and
1686 * parentheses, opaque variables are not allowed to be operands in
1687 * expressions; such use results in a compile-time error."
1689 if (type
->contains_opaque()) {
1690 _mesa_glsl_error(&loc
, state
, "opaque variables cannot be operands "
1691 "of the ?: operator");
1692 error_emitted
= true;
1695 ir_constant
*cond_val
= op
[0]->constant_expression_value();
1697 if (then_instructions
.is_empty()
1698 && else_instructions
.is_empty()
1699 && cond_val
!= NULL
) {
1700 result
= cond_val
->value
.b
[0] ? op
[1] : op
[2];
1702 /* The copy to conditional_tmp reads the whole array. */
1703 if (type
->is_array()) {
1704 mark_whole_array_access(op
[1]);
1705 mark_whole_array_access(op
[2]);
1708 ir_variable
*const tmp
=
1709 new(ctx
) ir_variable(type
, "conditional_tmp", ir_var_temporary
);
1710 instructions
->push_tail(tmp
);
1712 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1713 instructions
->push_tail(stmt
);
1715 then_instructions
.move_nodes_to(& stmt
->then_instructions
);
1716 ir_dereference
*const then_deref
=
1717 new(ctx
) ir_dereference_variable(tmp
);
1718 ir_assignment
*const then_assign
=
1719 new(ctx
) ir_assignment(then_deref
, op
[1]);
1720 stmt
->then_instructions
.push_tail(then_assign
);
1722 else_instructions
.move_nodes_to(& stmt
->else_instructions
);
1723 ir_dereference
*const else_deref
=
1724 new(ctx
) ir_dereference_variable(tmp
);
1725 ir_assignment
*const else_assign
=
1726 new(ctx
) ir_assignment(else_deref
, op
[2]);
1727 stmt
->else_instructions
.push_tail(else_assign
);
1729 result
= new(ctx
) ir_dereference_variable(tmp
);
1736 this->non_lvalue_description
= (this->oper
== ast_pre_inc
)
1737 ? "pre-increment operation" : "pre-decrement operation";
1739 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1740 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1742 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1744 ir_rvalue
*temp_rhs
;
1745 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1749 do_assignment(instructions
, state
,
1750 this->subexpressions
[0]->non_lvalue_description
,
1751 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1752 &result
, needs_rvalue
, false,
1753 this->subexpressions
[0]->get_location());
1758 case ast_post_dec
: {
1759 this->non_lvalue_description
= (this->oper
== ast_post_inc
)
1760 ? "post-increment operation" : "post-decrement operation";
1761 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1762 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1764 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1766 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1768 ir_rvalue
*temp_rhs
;
1769 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1772 /* Get a temporary of a copy of the lvalue before it's modified.
1773 * This may get thrown away later.
1775 result
= get_lvalue_copy(instructions
, op
[0]->clone(ctx
, NULL
));
1777 ir_rvalue
*junk_rvalue
;
1779 do_assignment(instructions
, state
,
1780 this->subexpressions
[0]->non_lvalue_description
,
1781 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1782 &junk_rvalue
, false, false,
1783 this->subexpressions
[0]->get_location());
1788 case ast_field_selection
:
1789 result
= _mesa_ast_field_selection_to_hir(this, instructions
, state
);
1792 case ast_array_index
: {
1793 YYLTYPE index_loc
= subexpressions
[1]->get_location();
1795 op
[0] = subexpressions
[0]->hir(instructions
, state
);
1796 op
[1] = subexpressions
[1]->hir(instructions
, state
);
1798 result
= _mesa_ast_array_index_to_hir(ctx
, state
, op
[0], op
[1],
1801 if (result
->type
->is_error())
1802 error_emitted
= true;
1807 case ast_function_call
:
1808 /* Should *NEVER* get here. ast_function_call should always be handled
1809 * by ast_function_expression::hir.
1814 case ast_identifier
: {
1815 /* ast_identifier can appear several places in a full abstract syntax
1816 * tree. This particular use must be at location specified in the grammar
1817 * as 'variable_identifier'.
1820 state
->symbols
->get_variable(this->primary_expression
.identifier
);
1823 var
->data
.used
= true;
1824 result
= new(ctx
) ir_dereference_variable(var
);
1826 _mesa_glsl_error(& loc
, state
, "`%s' undeclared",
1827 this->primary_expression
.identifier
);
1829 result
= ir_rvalue::error_value(ctx
);
1830 error_emitted
= true;
1835 case ast_int_constant
:
1836 result
= new(ctx
) ir_constant(this->primary_expression
.int_constant
);
1839 case ast_uint_constant
:
1840 result
= new(ctx
) ir_constant(this->primary_expression
.uint_constant
);
1843 case ast_float_constant
:
1844 result
= new(ctx
) ir_constant(this->primary_expression
.float_constant
);
1847 case ast_bool_constant
:
1848 result
= new(ctx
) ir_constant(bool(this->primary_expression
.bool_constant
));
1851 case ast_double_constant
:
1852 result
= new(ctx
) ir_constant(this->primary_expression
.double_constant
);
1855 case ast_sequence
: {
1856 /* It should not be possible to generate a sequence in the AST without
1857 * any expressions in it.
1859 assert(!this->expressions
.is_empty());
1861 /* The r-value of a sequence is the last expression in the sequence. If
1862 * the other expressions in the sequence do not have side-effects (and
1863 * therefore add instructions to the instruction list), they get dropped
1866 exec_node
*previous_tail_pred
= NULL
;
1867 YYLTYPE previous_operand_loc
= loc
;
1869 foreach_list_typed (ast_node
, ast
, link
, &this->expressions
) {
1870 /* If one of the operands of comma operator does not generate any
1871 * code, we want to emit a warning. At each pass through the loop
1872 * previous_tail_pred will point to the last instruction in the
1873 * stream *before* processing the previous operand. Naturally,
1874 * instructions->tail_pred will point to the last instruction in the
1875 * stream *after* processing the previous operand. If the two
1876 * pointers match, then the previous operand had no effect.
1878 * The warning behavior here differs slightly from GCC. GCC will
1879 * only emit a warning if none of the left-hand operands have an
1880 * effect. However, it will emit a warning for each. I believe that
1881 * there are some cases in C (especially with GCC extensions) where
1882 * it is useful to have an intermediate step in a sequence have no
1883 * effect, but I don't think these cases exist in GLSL. Either way,
1884 * it would be a giant hassle to replicate that behavior.
1886 if (previous_tail_pred
== instructions
->tail_pred
) {
1887 _mesa_glsl_warning(&previous_operand_loc
, state
,
1888 "left-hand operand of comma expression has "
1892 /* tail_pred is directly accessed instead of using the get_tail()
1893 * method for performance reasons. get_tail() has extra code to
1894 * return NULL when the list is empty. We don't care about that
1895 * here, so using tail_pred directly is fine.
1897 previous_tail_pred
= instructions
->tail_pred
;
1898 previous_operand_loc
= ast
->get_location();
1900 result
= ast
->hir(instructions
, state
);
1903 /* Any errors should have already been emitted in the loop above.
1905 error_emitted
= true;
1909 type
= NULL
; /* use result->type, not type. */
1910 assert(result
!= NULL
|| !needs_rvalue
);
1912 if (result
&& result
->type
->is_error() && !error_emitted
)
1913 _mesa_glsl_error(& loc
, state
, "type mismatch");
1920 ast_expression_statement::hir(exec_list
*instructions
,
1921 struct _mesa_glsl_parse_state
*state
)
1923 /* It is possible to have expression statements that don't have an
1924 * expression. This is the solitary semicolon:
1926 * for (i = 0; i < 5; i++)
1929 * In this case the expression will be NULL. Test for NULL and don't do
1930 * anything in that case.
1932 if (expression
!= NULL
)
1933 expression
->hir_no_rvalue(instructions
, state
);
1935 /* Statements do not have r-values.
1942 ast_compound_statement::hir(exec_list
*instructions
,
1943 struct _mesa_glsl_parse_state
*state
)
1946 state
->symbols
->push_scope();
1948 foreach_list_typed (ast_node
, ast
, link
, &this->statements
)
1949 ast
->hir(instructions
, state
);
1952 state
->symbols
->pop_scope();
1954 /* Compound statements do not have r-values.
1960 * Evaluate the given exec_node (which should be an ast_node representing
1961 * a single array dimension) and return its integer value.
1964 process_array_size(exec_node
*node
,
1965 struct _mesa_glsl_parse_state
*state
)
1967 exec_list dummy_instructions
;
1969 ast_node
*array_size
= exec_node_data(ast_node
, node
, link
);
1970 ir_rvalue
*const ir
= array_size
->hir(& dummy_instructions
, state
);
1971 YYLTYPE loc
= array_size
->get_location();
1974 _mesa_glsl_error(& loc
, state
,
1975 "array size could not be resolved");
1979 if (!ir
->type
->is_integer()) {
1980 _mesa_glsl_error(& loc
, state
,
1981 "array size must be integer type");
1985 if (!ir
->type
->is_scalar()) {
1986 _mesa_glsl_error(& loc
, state
,
1987 "array size must be scalar type");
1991 ir_constant
*const size
= ir
->constant_expression_value();
1993 _mesa_glsl_error(& loc
, state
, "array size must be a "
1994 "constant valued expression");
1998 if (size
->value
.i
[0] <= 0) {
1999 _mesa_glsl_error(& loc
, state
, "array size must be > 0");
2003 assert(size
->type
== ir
->type
);
2005 /* If the array size is const (and we've verified that
2006 * it is) then no instructions should have been emitted
2007 * when we converted it to HIR. If they were emitted,
2008 * then either the array size isn't const after all, or
2009 * we are emitting unnecessary instructions.
2011 assert(dummy_instructions
.is_empty());
2013 return size
->value
.u
[0];
2016 static const glsl_type
*
2017 process_array_type(YYLTYPE
*loc
, const glsl_type
*base
,
2018 ast_array_specifier
*array_specifier
,
2019 struct _mesa_glsl_parse_state
*state
)
2021 const glsl_type
*array_type
= base
;
2023 if (array_specifier
!= NULL
) {
2024 if (base
->is_array()) {
2026 /* From page 19 (page 25) of the GLSL 1.20 spec:
2028 * "Only one-dimensional arrays may be declared."
2030 if (!state
->ARB_arrays_of_arrays_enable
) {
2031 _mesa_glsl_error(loc
, state
,
2032 "invalid array of `%s'"
2033 "GL_ARB_arrays_of_arrays "
2034 "required for defining arrays of arrays",
2036 return glsl_type::error_type
;
2039 if (base
->length
== 0) {
2040 _mesa_glsl_error(loc
, state
,
2041 "only the outermost array dimension can "
2044 return glsl_type::error_type
;
2048 for (exec_node
*node
= array_specifier
->array_dimensions
.tail_pred
;
2049 !node
->is_head_sentinel(); node
= node
->prev
) {
2050 unsigned array_size
= process_array_size(node
, state
);
2051 array_type
= glsl_type::get_array_instance(array_type
, array_size
);
2054 if (array_specifier
->is_unsized_array
)
2055 array_type
= glsl_type::get_array_instance(array_type
, 0);
2063 ast_type_specifier::glsl_type(const char **name
,
2064 struct _mesa_glsl_parse_state
*state
) const
2066 const struct glsl_type
*type
;
2068 type
= state
->symbols
->get_type(this->type_name
);
2069 *name
= this->type_name
;
2071 YYLTYPE loc
= this->get_location();
2072 type
= process_array_type(&loc
, type
, this->array_specifier
, state
);
2078 ast_fully_specified_type::glsl_type(const char **name
,
2079 struct _mesa_glsl_parse_state
*state
) const
2081 const struct glsl_type
*type
= this->specifier
->glsl_type(name
, state
);
2086 if (type
->base_type
== GLSL_TYPE_FLOAT
2088 && state
->stage
== MESA_SHADER_FRAGMENT
2089 && this->qualifier
.precision
== ast_precision_none
2090 && state
->symbols
->get_variable("#default precision") == NULL
) {
2091 YYLTYPE loc
= this->get_location();
2092 _mesa_glsl_error(&loc
, state
,
2093 "no precision specified this scope for type `%s'",
2101 * Determine whether a toplevel variable declaration declares a varying. This
2102 * function operates by examining the variable's mode and the shader target,
2103 * so it correctly identifies linkage variables regardless of whether they are
2104 * declared using the deprecated "varying" syntax or the new "in/out" syntax.
2106 * Passing a non-toplevel variable declaration (e.g. a function parameter) to
2107 * this function will produce undefined results.
2110 is_varying_var(ir_variable
*var
, gl_shader_stage target
)
2113 case MESA_SHADER_VERTEX
:
2114 return var
->data
.mode
== ir_var_shader_out
;
2115 case MESA_SHADER_FRAGMENT
:
2116 return var
->data
.mode
== ir_var_shader_in
;
2118 return var
->data
.mode
== ir_var_shader_out
|| var
->data
.mode
== ir_var_shader_in
;
2124 * Matrix layout qualifiers are only allowed on certain types
2127 validate_matrix_layout_for_type(struct _mesa_glsl_parse_state
*state
,
2129 const glsl_type
*type
,
2132 if (var
&& !var
->is_in_buffer_block()) {
2133 /* Layout qualifiers may only apply to interface blocks and fields in
2136 _mesa_glsl_error(loc
, state
,
2137 "uniform block layout qualifiers row_major and "
2138 "column_major may not be applied to variables "
2139 "outside of uniform blocks");
2140 } else if (!type
->is_matrix()) {
2141 /* The OpenGL ES 3.0 conformance tests did not originally allow
2142 * matrix layout qualifiers on non-matrices. However, the OpenGL
2143 * 4.4 and OpenGL ES 3.0 (revision TBD) specifications were
2144 * amended to specifically allow these layouts on all types. Emit
2145 * a warning so that people know their code may not be portable.
2147 _mesa_glsl_warning(loc
, state
,
2148 "uniform block layout qualifiers row_major and "
2149 "column_major applied to non-matrix types may "
2150 "be rejected by older compilers");
2151 } else if (type
->is_record()) {
2152 /* We allow 'layout(row_major)' on structure types because it's the only
2153 * way to get row-major layouts on matrices contained in structures.
2155 _mesa_glsl_warning(loc
, state
,
2156 "uniform block layout qualifiers row_major and "
2157 "column_major applied to structure types is not "
2158 "strictly conformant and may be rejected by other "
2164 validate_binding_qualifier(struct _mesa_glsl_parse_state
*state
,
2166 const glsl_type
*type
,
2167 const ast_type_qualifier
*qual
)
2169 if (!qual
->flags
.q
.uniform
&& !qual
->flags
.q
.buffer
) {
2170 _mesa_glsl_error(loc
, state
,
2171 "the \"binding\" qualifier only applies to uniforms and "
2172 "shader storage buffer objects");
2176 if (qual
->binding
< 0) {
2177 _mesa_glsl_error(loc
, state
, "binding values must be >= 0");
2181 const struct gl_context
*const ctx
= state
->ctx
;
2182 unsigned elements
= type
->is_array() ? type
->arrays_of_arrays_size() : 1;
2183 unsigned max_index
= qual
->binding
+ elements
- 1;
2184 const glsl_type
*base_type
= type
->without_array();
2186 if (base_type
->is_interface()) {
2187 /* UBOs. From page 60 of the GLSL 4.20 specification:
2188 * "If the binding point for any uniform block instance is less than zero,
2189 * or greater than or equal to the implementation-dependent maximum
2190 * number of uniform buffer bindings, a compilation error will occur.
2191 * When the binding identifier is used with a uniform block instanced as
2192 * an array of size N, all elements of the array from binding through
2193 * binding + N – 1 must be within this range."
2195 * The implementation-dependent maximum is GL_MAX_UNIFORM_BUFFER_BINDINGS.
2197 if (qual
->flags
.q
.uniform
&&
2198 max_index
>= ctx
->Const
.MaxUniformBufferBindings
) {
2199 _mesa_glsl_error(loc
, state
, "layout(binding = %d) for %d UBOs exceeds "
2200 "the maximum number of UBO binding points (%d)",
2201 qual
->binding
, elements
,
2202 ctx
->Const
.MaxUniformBufferBindings
);
2206 /* SSBOs. From page 67 of the GLSL 4.30 specification:
2207 * "If the binding point for any uniform or shader storage block instance
2208 * is less than zero, or greater than or equal to the
2209 * implementation-dependent maximum number of uniform buffer bindings, a
2210 * compile-time error will occur. When the binding identifier is used
2211 * with a uniform or shader storage block instanced as an array of size
2212 * N, all elements of the array from binding through binding + N – 1 must
2213 * be within this range."
2215 if (qual
->flags
.q
.buffer
&&
2216 max_index
>= ctx
->Const
.MaxShaderStorageBufferBindings
) {
2217 _mesa_glsl_error(loc
, state
, "layout(binding = %d) for %d SSBOs exceeds "
2218 "the maximum number of SSBO binding points (%d)",
2219 qual
->binding
, elements
,
2220 ctx
->Const
.MaxShaderStorageBufferBindings
);
2223 } else if (base_type
->is_sampler()) {
2224 /* Samplers. From page 63 of the GLSL 4.20 specification:
2225 * "If the binding is less than zero, or greater than or equal to the
2226 * implementation-dependent maximum supported number of units, a
2227 * compilation error will occur. When the binding identifier is used
2228 * with an array of size N, all elements of the array from binding
2229 * through binding + N - 1 must be within this range."
2231 unsigned limit
= ctx
->Const
.MaxCombinedTextureImageUnits
;
2233 if (max_index
>= limit
) {
2234 _mesa_glsl_error(loc
, state
, "layout(binding = %d) for %d samplers "
2235 "exceeds the maximum number of texture image units "
2236 "(%d)", qual
->binding
, elements
, limit
);
2240 } else if (base_type
->contains_atomic()) {
2241 assert(ctx
->Const
.MaxAtomicBufferBindings
<= MAX_COMBINED_ATOMIC_BUFFERS
);
2242 if (unsigned(qual
->binding
) >= ctx
->Const
.MaxAtomicBufferBindings
) {
2243 _mesa_glsl_error(loc
, state
, "layout(binding = %d) exceeds the "
2244 " maximum number of atomic counter buffer bindings"
2245 "(%d)", qual
->binding
,
2246 ctx
->Const
.MaxAtomicBufferBindings
);
2250 } else if (state
->is_version(420, 310) && base_type
->is_image()) {
2251 assert(ctx
->Const
.MaxImageUnits
<= MAX_IMAGE_UNITS
);
2252 if (max_index
>= ctx
->Const
.MaxImageUnits
) {
2253 _mesa_glsl_error(loc
, state
, "Image binding %d exceeds the "
2254 " maximum number of image units (%d)", max_index
,
2255 ctx
->Const
.MaxImageUnits
);
2260 _mesa_glsl_error(loc
, state
,
2261 "the \"binding\" qualifier only applies to uniform "
2262 "blocks, opaque variables, or arrays thereof");
2270 static glsl_interp_qualifier
2271 interpret_interpolation_qualifier(const struct ast_type_qualifier
*qual
,
2272 ir_variable_mode mode
,
2273 struct _mesa_glsl_parse_state
*state
,
2276 glsl_interp_qualifier interpolation
;
2277 if (qual
->flags
.q
.flat
)
2278 interpolation
= INTERP_QUALIFIER_FLAT
;
2279 else if (qual
->flags
.q
.noperspective
)
2280 interpolation
= INTERP_QUALIFIER_NOPERSPECTIVE
;
2281 else if (qual
->flags
.q
.smooth
)
2282 interpolation
= INTERP_QUALIFIER_SMOOTH
;
2284 interpolation
= INTERP_QUALIFIER_NONE
;
2286 if (interpolation
!= INTERP_QUALIFIER_NONE
) {
2287 if (mode
!= ir_var_shader_in
&& mode
!= ir_var_shader_out
) {
2288 _mesa_glsl_error(loc
, state
,
2289 "interpolation qualifier `%s' can only be applied to "
2290 "shader inputs or outputs.",
2291 interpolation_string(interpolation
));
2295 if ((state
->stage
== MESA_SHADER_VERTEX
&& mode
== ir_var_shader_in
) ||
2296 (state
->stage
== MESA_SHADER_FRAGMENT
&& mode
== ir_var_shader_out
)) {
2297 _mesa_glsl_error(loc
, state
,
2298 "interpolation qualifier `%s' cannot be applied to "
2299 "vertex shader inputs or fragment shader outputs",
2300 interpolation_string(interpolation
));
2304 return interpolation
;
2309 validate_explicit_location(const struct ast_type_qualifier
*qual
,
2311 struct _mesa_glsl_parse_state
*state
,
2316 /* Checks for GL_ARB_explicit_uniform_location. */
2317 if (qual
->flags
.q
.uniform
) {
2318 if (!state
->check_explicit_uniform_location_allowed(loc
, var
))
2321 const struct gl_context
*const ctx
= state
->ctx
;
2322 unsigned max_loc
= qual
->location
+ var
->type
->uniform_locations() - 1;
2324 /* ARB_explicit_uniform_location specification states:
2326 * "The explicitly defined locations and the generated locations
2327 * must be in the range of 0 to MAX_UNIFORM_LOCATIONS minus one."
2329 * "Valid locations for default-block uniform variable locations
2330 * are in the range of 0 to the implementation-defined maximum
2331 * number of uniform locations."
2333 if (qual
->location
< 0) {
2334 _mesa_glsl_error(loc
, state
,
2335 "explicit location < 0 for uniform %s", var
->name
);
2339 if (max_loc
>= ctx
->Const
.MaxUserAssignableUniformLocations
) {
2340 _mesa_glsl_error(loc
, state
, "location(s) consumed by uniform %s "
2341 ">= MAX_UNIFORM_LOCATIONS (%u)", var
->name
,
2342 ctx
->Const
.MaxUserAssignableUniformLocations
);
2346 var
->data
.explicit_location
= true;
2347 var
->data
.location
= qual
->location
;
2351 /* Between GL_ARB_explicit_attrib_location an
2352 * GL_ARB_separate_shader_objects, the inputs and outputs of any shader
2353 * stage can be assigned explicit locations. The checking here associates
2354 * the correct extension with the correct stage's input / output:
2358 * vertex explicit_loc sso
2359 * tess control sso sso
2362 * fragment sso explicit_loc
2364 switch (state
->stage
) {
2365 case MESA_SHADER_VERTEX
:
2366 if (var
->data
.mode
== ir_var_shader_in
) {
2367 if (!state
->check_explicit_attrib_location_allowed(loc
, var
))
2373 if (var
->data
.mode
== ir_var_shader_out
) {
2374 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
2383 case MESA_SHADER_TESS_CTRL
:
2384 case MESA_SHADER_TESS_EVAL
:
2385 case MESA_SHADER_GEOMETRY
:
2386 if (var
->data
.mode
== ir_var_shader_in
|| var
->data
.mode
== ir_var_shader_out
) {
2387 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
2396 case MESA_SHADER_FRAGMENT
:
2397 if (var
->data
.mode
== ir_var_shader_in
) {
2398 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
2404 if (var
->data
.mode
== ir_var_shader_out
) {
2405 if (!state
->check_explicit_attrib_location_allowed(loc
, var
))
2414 case MESA_SHADER_COMPUTE
:
2415 _mesa_glsl_error(loc
, state
,
2416 "compute shader variables cannot be given "
2417 "explicit locations");
2422 _mesa_glsl_error(loc
, state
,
2423 "%s cannot be given an explicit location in %s shader",
2425 _mesa_shader_stage_to_string(state
->stage
));
2427 var
->data
.explicit_location
= true;
2429 /* This bit of silliness is needed because invalid explicit locations
2430 * are supposed to be flagged during linking. Small negative values
2431 * biased by VERT_ATTRIB_GENERIC0 or FRAG_RESULT_DATA0 could alias
2432 * built-in values (e.g., -16+VERT_ATTRIB_GENERIC0 = VERT_ATTRIB_POS).
2433 * The linker needs to be able to differentiate these cases. This
2434 * ensures that negative values stay negative.
2436 if (qual
->location
>= 0) {
2437 switch (state
->stage
) {
2438 case MESA_SHADER_VERTEX
:
2439 var
->data
.location
= (var
->data
.mode
== ir_var_shader_in
)
2440 ? (qual
->location
+ VERT_ATTRIB_GENERIC0
)
2441 : (qual
->location
+ VARYING_SLOT_VAR0
);
2444 case MESA_SHADER_TESS_CTRL
:
2445 case MESA_SHADER_TESS_EVAL
:
2446 case MESA_SHADER_GEOMETRY
:
2447 if (var
->data
.patch
)
2448 var
->data
.location
= qual
->location
+ VARYING_SLOT_PATCH0
;
2450 var
->data
.location
= qual
->location
+ VARYING_SLOT_VAR0
;
2453 case MESA_SHADER_FRAGMENT
:
2454 var
->data
.location
= (var
->data
.mode
== ir_var_shader_out
)
2455 ? (qual
->location
+ FRAG_RESULT_DATA0
)
2456 : (qual
->location
+ VARYING_SLOT_VAR0
);
2458 case MESA_SHADER_COMPUTE
:
2459 assert(!"Unexpected shader type");
2463 var
->data
.location
= qual
->location
;
2466 if (qual
->flags
.q
.explicit_index
) {
2467 /* From the GLSL 4.30 specification, section 4.4.2 (Output
2468 * Layout Qualifiers):
2470 * "It is also a compile-time error if a fragment shader
2471 * sets a layout index to less than 0 or greater than 1."
2473 * Older specifications don't mandate a behavior; we take
2474 * this as a clarification and always generate the error.
2476 if (qual
->index
< 0 || qual
->index
> 1) {
2477 _mesa_glsl_error(loc
, state
,
2478 "explicit index may only be 0 or 1");
2480 var
->data
.explicit_index
= true;
2481 var
->data
.index
= qual
->index
;
2488 apply_image_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
2490 struct _mesa_glsl_parse_state
*state
,
2493 const glsl_type
*base_type
= var
->type
->without_array();
2495 if (base_type
->is_image()) {
2496 if (var
->data
.mode
!= ir_var_uniform
&&
2497 var
->data
.mode
!= ir_var_function_in
) {
2498 _mesa_glsl_error(loc
, state
, "image variables may only be declared as "
2499 "function parameters or uniform-qualified "
2500 "global variables");
2503 var
->data
.image_read_only
|= qual
->flags
.q
.read_only
;
2504 var
->data
.image_write_only
|= qual
->flags
.q
.write_only
;
2505 var
->data
.image_coherent
|= qual
->flags
.q
.coherent
;
2506 var
->data
.image_volatile
|= qual
->flags
.q
._volatile
;
2507 var
->data
.image_restrict
|= qual
->flags
.q
.restrict_flag
;
2508 var
->data
.read_only
= true;
2510 if (qual
->flags
.q
.explicit_image_format
) {
2511 if (var
->data
.mode
== ir_var_function_in
) {
2512 _mesa_glsl_error(loc
, state
, "format qualifiers cannot be "
2513 "used on image function parameters");
2516 if (qual
->image_base_type
!= base_type
->sampler_type
) {
2517 _mesa_glsl_error(loc
, state
, "format qualifier doesn't match the "
2518 "base data type of the image");
2521 var
->data
.image_format
= qual
->image_format
;
2523 if (var
->data
.mode
== ir_var_uniform
) {
2524 if (state
->es_shader
) {
2525 _mesa_glsl_error(loc
, state
, "all image uniforms "
2526 "must have a format layout qualifier");
2528 } else if (!qual
->flags
.q
.write_only
) {
2529 _mesa_glsl_error(loc
, state
, "image uniforms not qualified with "
2530 "`writeonly' must have a format layout "
2535 var
->data
.image_format
= GL_NONE
;
2538 /* From page 70 of the GLSL ES 3.1 specification:
2540 * "Except for image variables qualified with the format qualifiers
2541 * r32f, r32i, and r32ui, image variables must specify either memory
2542 * qualifier readonly or the memory qualifier writeonly."
2544 if (state
->es_shader
&&
2545 var
->data
.image_format
!= GL_R32F
&&
2546 var
->data
.image_format
!= GL_R32I
&&
2547 var
->data
.image_format
!= GL_R32UI
&&
2548 !var
->data
.image_read_only
&&
2549 !var
->data
.image_write_only
) {
2550 _mesa_glsl_error(loc
, state
, "image variables of format other than "
2551 "r32f, r32i or r32ui must be qualified `readonly' or "
2555 } else if (qual
->flags
.q
.read_only
||
2556 qual
->flags
.q
.write_only
||
2557 qual
->flags
.q
.coherent
||
2558 qual
->flags
.q
._volatile
||
2559 qual
->flags
.q
.restrict_flag
||
2560 qual
->flags
.q
.explicit_image_format
) {
2561 _mesa_glsl_error(loc
, state
, "memory qualifiers may only be applied to "
2566 static inline const char*
2567 get_layout_qualifier_string(bool origin_upper_left
, bool pixel_center_integer
)
2569 if (origin_upper_left
&& pixel_center_integer
)
2570 return "origin_upper_left, pixel_center_integer";
2571 else if (origin_upper_left
)
2572 return "origin_upper_left";
2573 else if (pixel_center_integer
)
2574 return "pixel_center_integer";
2580 is_conflicting_fragcoord_redeclaration(struct _mesa_glsl_parse_state
*state
,
2581 const struct ast_type_qualifier
*qual
)
2583 /* If gl_FragCoord was previously declared, and the qualifiers were
2584 * different in any way, return true.
2586 if (state
->fs_redeclares_gl_fragcoord
) {
2587 return (state
->fs_pixel_center_integer
!= qual
->flags
.q
.pixel_center_integer
2588 || state
->fs_origin_upper_left
!= qual
->flags
.q
.origin_upper_left
);
2595 apply_type_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
2597 struct _mesa_glsl_parse_state
*state
,
2601 STATIC_ASSERT(sizeof(qual
->flags
.q
) <= sizeof(qual
->flags
.i
));
2603 if (qual
->flags
.q
.invariant
) {
2604 if (var
->data
.used
) {
2605 _mesa_glsl_error(loc
, state
,
2606 "variable `%s' may not be redeclared "
2607 "`invariant' after being used",
2610 var
->data
.invariant
= 1;
2614 if (qual
->flags
.q
.precise
) {
2615 if (var
->data
.used
) {
2616 _mesa_glsl_error(loc
, state
,
2617 "variable `%s' may not be redeclared "
2618 "`precise' after being used",
2621 var
->data
.precise
= 1;
2625 if (qual
->flags
.q
.subroutine
&& !qual
->flags
.q
.uniform
) {
2626 _mesa_glsl_error(loc
, state
,
2627 "`subroutine' may only be applied to uniforms, "
2628 "subroutine type declarations, or function definitions");
2631 if (qual
->flags
.q
.constant
|| qual
->flags
.q
.attribute
2632 || qual
->flags
.q
.uniform
2633 || (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_FRAGMENT
)))
2634 var
->data
.read_only
= 1;
2636 if (qual
->flags
.q
.centroid
)
2637 var
->data
.centroid
= 1;
2639 if (qual
->flags
.q
.sample
)
2640 var
->data
.sample
= 1;
2642 if (state
->stage
== MESA_SHADER_GEOMETRY
&&
2643 qual
->flags
.q
.out
&& qual
->flags
.q
.stream
) {
2644 var
->data
.stream
= qual
->stream
;
2647 if (qual
->flags
.q
.patch
)
2648 var
->data
.patch
= 1;
2650 if (qual
->flags
.q
.attribute
&& state
->stage
!= MESA_SHADER_VERTEX
) {
2651 var
->type
= glsl_type::error_type
;
2652 _mesa_glsl_error(loc
, state
,
2653 "`attribute' variables may not be declared in the "
2655 _mesa_shader_stage_to_string(state
->stage
));
2658 /* Disallow layout qualifiers which may only appear on layout declarations. */
2659 if (qual
->flags
.q
.prim_type
) {
2660 _mesa_glsl_error(loc
, state
,
2661 "Primitive type may only be specified on GS input or output "
2662 "layout declaration, not on variables.");
2665 /* Section 6.1.1 (Function Calling Conventions) of the GLSL 1.10 spec says:
2667 * "However, the const qualifier cannot be used with out or inout."
2669 * The same section of the GLSL 4.40 spec further clarifies this saying:
2671 * "The const qualifier cannot be used with out or inout, or a
2672 * compile-time error results."
2674 if (is_parameter
&& qual
->flags
.q
.constant
&& qual
->flags
.q
.out
) {
2675 _mesa_glsl_error(loc
, state
,
2676 "`const' may not be applied to `out' or `inout' "
2677 "function parameters");
2680 /* If there is no qualifier that changes the mode of the variable, leave
2681 * the setting alone.
2683 assert(var
->data
.mode
!= ir_var_temporary
);
2684 if (qual
->flags
.q
.in
&& qual
->flags
.q
.out
)
2685 var
->data
.mode
= ir_var_function_inout
;
2686 else if (qual
->flags
.q
.in
)
2687 var
->data
.mode
= is_parameter
? ir_var_function_in
: ir_var_shader_in
;
2688 else if (qual
->flags
.q
.attribute
2689 || (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_FRAGMENT
)))
2690 var
->data
.mode
= ir_var_shader_in
;
2691 else if (qual
->flags
.q
.out
)
2692 var
->data
.mode
= is_parameter
? ir_var_function_out
: ir_var_shader_out
;
2693 else if (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_VERTEX
))
2694 var
->data
.mode
= ir_var_shader_out
;
2695 else if (qual
->flags
.q
.uniform
)
2696 var
->data
.mode
= ir_var_uniform
;
2697 else if (qual
->flags
.q
.buffer
)
2698 var
->data
.mode
= ir_var_shader_storage
;
2700 if (!is_parameter
&& is_varying_var(var
, state
->stage
)) {
2701 /* User-defined ins/outs are not permitted in compute shaders. */
2702 if (state
->stage
== MESA_SHADER_COMPUTE
) {
2703 _mesa_glsl_error(loc
, state
,
2704 "user-defined input and output variables are not "
2705 "permitted in compute shaders");
2708 /* This variable is being used to link data between shader stages (in
2709 * pre-glsl-1.30 parlance, it's a "varying"). Check that it has a type
2710 * that is allowed for such purposes.
2712 * From page 25 (page 31 of the PDF) of the GLSL 1.10 spec:
2714 * "The varying qualifier can be used only with the data types
2715 * float, vec2, vec3, vec4, mat2, mat3, and mat4, or arrays of
2718 * This was relaxed in GLSL version 1.30 and GLSL ES version 3.00. From
2719 * page 31 (page 37 of the PDF) of the GLSL 1.30 spec:
2721 * "Fragment inputs can only be signed and unsigned integers and
2722 * integer vectors, float, floating-point vectors, matrices, or
2723 * arrays of these. Structures cannot be input.
2725 * Similar text exists in the section on vertex shader outputs.
2727 * Similar text exists in the GLSL ES 3.00 spec, except that the GLSL ES
2728 * 3.00 spec allows structs as well. Varying structs are also allowed
2731 switch (var
->type
->get_scalar_type()->base_type
) {
2732 case GLSL_TYPE_FLOAT
:
2733 /* Ok in all GLSL versions */
2735 case GLSL_TYPE_UINT
:
2737 if (state
->is_version(130, 300))
2739 _mesa_glsl_error(loc
, state
,
2740 "varying variables must be of base type float in %s",
2741 state
->get_version_string());
2743 case GLSL_TYPE_STRUCT
:
2744 if (state
->is_version(150, 300))
2746 _mesa_glsl_error(loc
, state
,
2747 "varying variables may not be of type struct");
2749 case GLSL_TYPE_DOUBLE
:
2752 _mesa_glsl_error(loc
, state
, "illegal type for a varying variable");
2757 if (state
->all_invariant
&& (state
->current_function
== NULL
)) {
2758 switch (state
->stage
) {
2759 case MESA_SHADER_VERTEX
:
2760 if (var
->data
.mode
== ir_var_shader_out
)
2761 var
->data
.invariant
= true;
2763 case MESA_SHADER_TESS_CTRL
:
2764 case MESA_SHADER_TESS_EVAL
:
2765 case MESA_SHADER_GEOMETRY
:
2766 if ((var
->data
.mode
== ir_var_shader_in
)
2767 || (var
->data
.mode
== ir_var_shader_out
))
2768 var
->data
.invariant
= true;
2770 case MESA_SHADER_FRAGMENT
:
2771 if (var
->data
.mode
== ir_var_shader_in
)
2772 var
->data
.invariant
= true;
2774 case MESA_SHADER_COMPUTE
:
2775 /* Invariance isn't meaningful in compute shaders. */
2780 var
->data
.interpolation
=
2781 interpret_interpolation_qualifier(qual
, (ir_variable_mode
) var
->data
.mode
,
2784 var
->data
.pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
2785 var
->data
.origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
2786 if ((qual
->flags
.q
.origin_upper_left
|| qual
->flags
.q
.pixel_center_integer
)
2787 && (strcmp(var
->name
, "gl_FragCoord") != 0)) {
2788 const char *const qual_string
= (qual
->flags
.q
.origin_upper_left
)
2789 ? "origin_upper_left" : "pixel_center_integer";
2791 _mesa_glsl_error(loc
, state
,
2792 "layout qualifier `%s' can only be applied to "
2793 "fragment shader input `gl_FragCoord'",
2797 if (var
->name
!= NULL
&& strcmp(var
->name
, "gl_FragCoord") == 0) {
2799 /* Section 4.3.8.1, page 39 of GLSL 1.50 spec says:
2801 * "Within any shader, the first redeclarations of gl_FragCoord
2802 * must appear before any use of gl_FragCoord."
2804 * Generate a compiler error if above condition is not met by the
2807 ir_variable
*earlier
= state
->symbols
->get_variable("gl_FragCoord");
2808 if (earlier
!= NULL
&&
2809 earlier
->data
.used
&&
2810 !state
->fs_redeclares_gl_fragcoord
) {
2811 _mesa_glsl_error(loc
, state
,
2812 "gl_FragCoord used before its first redeclaration "
2813 "in fragment shader");
2816 /* Make sure all gl_FragCoord redeclarations specify the same layout
2819 if (is_conflicting_fragcoord_redeclaration(state
, qual
)) {
2820 const char *const qual_string
=
2821 get_layout_qualifier_string(qual
->flags
.q
.origin_upper_left
,
2822 qual
->flags
.q
.pixel_center_integer
);
2824 const char *const state_string
=
2825 get_layout_qualifier_string(state
->fs_origin_upper_left
,
2826 state
->fs_pixel_center_integer
);
2828 _mesa_glsl_error(loc
, state
,
2829 "gl_FragCoord redeclared with different layout "
2830 "qualifiers (%s) and (%s) ",
2834 state
->fs_origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
2835 state
->fs_pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
2836 state
->fs_redeclares_gl_fragcoord_with_no_layout_qualifiers
=
2837 !qual
->flags
.q
.origin_upper_left
&& !qual
->flags
.q
.pixel_center_integer
;
2838 state
->fs_redeclares_gl_fragcoord
=
2839 state
->fs_origin_upper_left
||
2840 state
->fs_pixel_center_integer
||
2841 state
->fs_redeclares_gl_fragcoord_with_no_layout_qualifiers
;
2844 if (qual
->flags
.q
.explicit_location
) {
2845 validate_explicit_location(qual
, var
, state
, loc
);
2846 } else if (qual
->flags
.q
.explicit_index
) {
2847 _mesa_glsl_error(loc
, state
, "explicit index requires explicit location");
2850 if (qual
->flags
.q
.explicit_binding
&&
2851 validate_binding_qualifier(state
, loc
, var
->type
, qual
)) {
2852 var
->data
.explicit_binding
= true;
2853 var
->data
.binding
= qual
->binding
;
2856 if (var
->type
->contains_atomic()) {
2857 if (var
->data
.mode
== ir_var_uniform
) {
2858 if (var
->data
.explicit_binding
) {
2860 &state
->atomic_counter_offsets
[var
->data
.binding
];
2862 if (*offset
% ATOMIC_COUNTER_SIZE
)
2863 _mesa_glsl_error(loc
, state
,
2864 "misaligned atomic counter offset");
2866 var
->data
.atomic
.offset
= *offset
;
2867 *offset
+= var
->type
->atomic_size();
2870 _mesa_glsl_error(loc
, state
,
2871 "atomic counters require explicit binding point");
2873 } else if (var
->data
.mode
!= ir_var_function_in
) {
2874 _mesa_glsl_error(loc
, state
, "atomic counters may only be declared as "
2875 "function parameters or uniform-qualified "
2876 "global variables");
2880 /* Does the declaration use the deprecated 'attribute' or 'varying'
2883 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
2884 || qual
->flags
.q
.varying
;
2887 /* Validate auxiliary storage qualifiers */
2889 /* From section 4.3.4 of the GLSL 1.30 spec:
2890 * "It is an error to use centroid in in a vertex shader."
2892 * From section 4.3.4 of the GLSL ES 3.00 spec:
2893 * "It is an error to use centroid in or interpolation qualifiers in
2894 * a vertex shader input."
2897 /* Section 4.3.6 of the GLSL 1.30 specification states:
2898 * "It is an error to use centroid out in a fragment shader."
2900 * The GL_ARB_shading_language_420pack extension specification states:
2901 * "It is an error to use auxiliary storage qualifiers or interpolation
2902 * qualifiers on an output in a fragment shader."
2904 if (qual
->flags
.q
.sample
&& (!is_varying_var(var
, state
->stage
) || uses_deprecated_qualifier
)) {
2905 _mesa_glsl_error(loc
, state
,
2906 "sample qualifier may only be used on `in` or `out` "
2907 "variables between shader stages");
2909 if (qual
->flags
.q
.centroid
&& !is_varying_var(var
, state
->stage
)) {
2910 _mesa_glsl_error(loc
, state
,
2911 "centroid qualifier may only be used with `in', "
2912 "`out' or `varying' variables between shader stages");
2916 /* Is the 'layout' keyword used with parameters that allow relaxed checking.
2917 * Many implementations of GL_ARB_fragment_coord_conventions_enable and some
2918 * implementations (only Mesa?) GL_ARB_explicit_attrib_location_enable
2919 * allowed the layout qualifier to be used with 'varying' and 'attribute'.
2920 * These extensions and all following extensions that add the 'layout'
2921 * keyword have been modified to require the use of 'in' or 'out'.
2923 * The following extension do not allow the deprecated keywords:
2925 * GL_AMD_conservative_depth
2926 * GL_ARB_conservative_depth
2927 * GL_ARB_gpu_shader5
2928 * GL_ARB_separate_shader_objects
2929 * GL_ARB_tessellation_shader
2930 * GL_ARB_transform_feedback3
2931 * GL_ARB_uniform_buffer_object
2933 * It is unknown whether GL_EXT_shader_image_load_store or GL_NV_gpu_shader5
2934 * allow layout with the deprecated keywords.
2936 const bool relaxed_layout_qualifier_checking
=
2937 state
->ARB_fragment_coord_conventions_enable
;
2939 if (qual
->has_layout() && uses_deprecated_qualifier
) {
2940 if (relaxed_layout_qualifier_checking
) {
2941 _mesa_glsl_warning(loc
, state
,
2942 "`layout' qualifier may not be used with "
2943 "`attribute' or `varying'");
2945 _mesa_glsl_error(loc
, state
,
2946 "`layout' qualifier may not be used with "
2947 "`attribute' or `varying'");
2951 /* Layout qualifiers for gl_FragDepth, which are enabled by extension
2952 * AMD_conservative_depth.
2954 int depth_layout_count
= qual
->flags
.q
.depth_any
2955 + qual
->flags
.q
.depth_greater
2956 + qual
->flags
.q
.depth_less
2957 + qual
->flags
.q
.depth_unchanged
;
2958 if (depth_layout_count
> 0
2959 && !state
->AMD_conservative_depth_enable
2960 && !state
->ARB_conservative_depth_enable
) {
2961 _mesa_glsl_error(loc
, state
,
2962 "extension GL_AMD_conservative_depth or "
2963 "GL_ARB_conservative_depth must be enabled "
2964 "to use depth layout qualifiers");
2965 } else if (depth_layout_count
> 0
2966 && strcmp(var
->name
, "gl_FragDepth") != 0) {
2967 _mesa_glsl_error(loc
, state
,
2968 "depth layout qualifiers can be applied only to "
2970 } else if (depth_layout_count
> 1
2971 && strcmp(var
->name
, "gl_FragDepth") == 0) {
2972 _mesa_glsl_error(loc
, state
,
2973 "at most one depth layout qualifier can be applied to "
2976 if (qual
->flags
.q
.depth_any
)
2977 var
->data
.depth_layout
= ir_depth_layout_any
;
2978 else if (qual
->flags
.q
.depth_greater
)
2979 var
->data
.depth_layout
= ir_depth_layout_greater
;
2980 else if (qual
->flags
.q
.depth_less
)
2981 var
->data
.depth_layout
= ir_depth_layout_less
;
2982 else if (qual
->flags
.q
.depth_unchanged
)
2983 var
->data
.depth_layout
= ir_depth_layout_unchanged
;
2985 var
->data
.depth_layout
= ir_depth_layout_none
;
2987 if (qual
->flags
.q
.std140
||
2988 qual
->flags
.q
.std430
||
2989 qual
->flags
.q
.packed
||
2990 qual
->flags
.q
.shared
) {
2991 _mesa_glsl_error(loc
, state
,
2992 "uniform and shader storage block layout qualifiers "
2993 "std140, std430, packed, and shared can only be "
2994 "applied to uniform or shader storage blocks, not "
2998 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
2999 validate_matrix_layout_for_type(state
, loc
, var
->type
, var
);
3002 apply_image_qualifier_to_variable(qual
, var
, state
, loc
);
3004 /* From section 4.4.1.3 of the GLSL 4.50 specification (Fragment Shader
3007 * "Fragment shaders also allow the following layout qualifier on in only
3008 * (not with variable declarations)
3009 * layout-qualifier-id
3010 * early_fragment_tests
3013 if (qual
->flags
.q
.early_fragment_tests
) {
3014 _mesa_glsl_error(loc
, state
, "early_fragment_tests layout qualifier only "
3015 "valid in fragment shader input layout declaration.");
3020 * Get the variable that is being redeclared by this declaration
3022 * Semantic checks to verify the validity of the redeclaration are also
3023 * performed. If semantic checks fail, compilation error will be emitted via
3024 * \c _mesa_glsl_error, but a non-\c NULL pointer will still be returned.
3027 * A pointer to an existing variable in the current scope if the declaration
3028 * is a redeclaration, \c NULL otherwise.
3030 static ir_variable
*
3031 get_variable_being_redeclared(ir_variable
*var
, YYLTYPE loc
,
3032 struct _mesa_glsl_parse_state
*state
,
3033 bool allow_all_redeclarations
)
3035 /* Check if this declaration is actually a re-declaration, either to
3036 * resize an array or add qualifiers to an existing variable.
3038 * This is allowed for variables in the current scope, or when at
3039 * global scope (for built-ins in the implicit outer scope).
3041 ir_variable
*earlier
= state
->symbols
->get_variable(var
->name
);
3042 if (earlier
== NULL
||
3043 (state
->current_function
!= NULL
&&
3044 !state
->symbols
->name_declared_this_scope(var
->name
))) {
3049 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec,
3051 * "It is legal to declare an array without a size and then
3052 * later re-declare the same name as an array of the same
3053 * type and specify a size."
3055 if (earlier
->type
->is_unsized_array() && var
->type
->is_array()
3056 && (var
->type
->fields
.array
== earlier
->type
->fields
.array
)) {
3057 /* FINISHME: This doesn't match the qualifiers on the two
3058 * FINISHME: declarations. It's not 100% clear whether this is
3059 * FINISHME: required or not.
3062 const unsigned size
= unsigned(var
->type
->array_size());
3063 check_builtin_array_max_size(var
->name
, size
, loc
, state
);
3064 if ((size
> 0) && (size
<= earlier
->data
.max_array_access
)) {
3065 _mesa_glsl_error(& loc
, state
, "array size must be > %u due to "
3067 earlier
->data
.max_array_access
);
3070 earlier
->type
= var
->type
;
3073 } else if ((state
->ARB_fragment_coord_conventions_enable
||
3074 state
->is_version(150, 0))
3075 && strcmp(var
->name
, "gl_FragCoord") == 0
3076 && earlier
->type
== var
->type
3077 && earlier
->data
.mode
== var
->data
.mode
) {
3078 /* Allow redeclaration of gl_FragCoord for ARB_fcc layout
3081 earlier
->data
.origin_upper_left
= var
->data
.origin_upper_left
;
3082 earlier
->data
.pixel_center_integer
= var
->data
.pixel_center_integer
;
3084 /* According to section 4.3.7 of the GLSL 1.30 spec,
3085 * the following built-in varaibles can be redeclared with an
3086 * interpolation qualifier:
3089 * * gl_FrontSecondaryColor
3090 * * gl_BackSecondaryColor
3092 * * gl_SecondaryColor
3094 } else if (state
->is_version(130, 0)
3095 && (strcmp(var
->name
, "gl_FrontColor") == 0
3096 || strcmp(var
->name
, "gl_BackColor") == 0
3097 || strcmp(var
->name
, "gl_FrontSecondaryColor") == 0
3098 || strcmp(var
->name
, "gl_BackSecondaryColor") == 0
3099 || strcmp(var
->name
, "gl_Color") == 0
3100 || strcmp(var
->name
, "gl_SecondaryColor") == 0)
3101 && earlier
->type
== var
->type
3102 && earlier
->data
.mode
== var
->data
.mode
) {
3103 earlier
->data
.interpolation
= var
->data
.interpolation
;
3105 /* Layout qualifiers for gl_FragDepth. */
3106 } else if ((state
->AMD_conservative_depth_enable
||
3107 state
->ARB_conservative_depth_enable
)
3108 && strcmp(var
->name
, "gl_FragDepth") == 0
3109 && earlier
->type
== var
->type
3110 && earlier
->data
.mode
== var
->data
.mode
) {
3112 /** From the AMD_conservative_depth spec:
3113 * Within any shader, the first redeclarations of gl_FragDepth
3114 * must appear before any use of gl_FragDepth.
3116 if (earlier
->data
.used
) {
3117 _mesa_glsl_error(&loc
, state
,
3118 "the first redeclaration of gl_FragDepth "
3119 "must appear before any use of gl_FragDepth");
3122 /* Prevent inconsistent redeclaration of depth layout qualifier. */
3123 if (earlier
->data
.depth_layout
!= ir_depth_layout_none
3124 && earlier
->data
.depth_layout
!= var
->data
.depth_layout
) {
3125 _mesa_glsl_error(&loc
, state
,
3126 "gl_FragDepth: depth layout is declared here "
3127 "as '%s, but it was previously declared as "
3129 depth_layout_string(var
->data
.depth_layout
),
3130 depth_layout_string(earlier
->data
.depth_layout
));
3133 earlier
->data
.depth_layout
= var
->data
.depth_layout
;
3135 } else if (allow_all_redeclarations
) {
3136 if (earlier
->data
.mode
!= var
->data
.mode
) {
3137 _mesa_glsl_error(&loc
, state
,
3138 "redeclaration of `%s' with incorrect qualifiers",
3140 } else if (earlier
->type
!= var
->type
) {
3141 _mesa_glsl_error(&loc
, state
,
3142 "redeclaration of `%s' has incorrect type",
3146 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", var
->name
);
3153 * Generate the IR for an initializer in a variable declaration
3156 process_initializer(ir_variable
*var
, ast_declaration
*decl
,
3157 ast_fully_specified_type
*type
,
3158 exec_list
*initializer_instructions
,
3159 struct _mesa_glsl_parse_state
*state
)
3161 ir_rvalue
*result
= NULL
;
3163 YYLTYPE initializer_loc
= decl
->initializer
->get_location();
3165 /* From page 24 (page 30 of the PDF) of the GLSL 1.10 spec:
3167 * "All uniform variables are read-only and are initialized either
3168 * directly by an application via API commands, or indirectly by
3171 if (var
->data
.mode
== ir_var_uniform
) {
3172 state
->check_version(120, 0, &initializer_loc
,
3173 "cannot initialize uniform %s",
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 "cannot initialize buffer variable %s",
3187 /* From section 4.1.7 of the GLSL 4.40 spec:
3189 * "Opaque variables [...] are initialized only through the
3190 * OpenGL API; they cannot be declared with an initializer in a
3193 if (var
->type
->contains_opaque()) {
3194 _mesa_glsl_error(&initializer_loc
, state
,
3195 "cannot initialize opaque variable %s",
3199 if ((var
->data
.mode
== ir_var_shader_in
) && (state
->current_function
== NULL
)) {
3200 _mesa_glsl_error(&initializer_loc
, state
,
3201 "cannot initialize %s shader input / %s %s",
3202 _mesa_shader_stage_to_string(state
->stage
),
3203 (state
->stage
== MESA_SHADER_VERTEX
)
3204 ? "attribute" : "varying",
3208 if (var
->data
.mode
== ir_var_shader_out
&& state
->current_function
== NULL
) {
3209 _mesa_glsl_error(&initializer_loc
, state
,
3210 "cannot initialize %s shader output %s",
3211 _mesa_shader_stage_to_string(state
->stage
),
3215 /* If the initializer is an ast_aggregate_initializer, recursively store
3216 * type information from the LHS into it, so that its hir() function can do
3219 if (decl
->initializer
->oper
== ast_aggregate
)
3220 _mesa_ast_set_aggregate_type(var
->type
, decl
->initializer
);
3222 ir_dereference
*const lhs
= new(state
) ir_dereference_variable(var
);
3223 ir_rvalue
*rhs
= decl
->initializer
->hir(initializer_instructions
, state
);
3225 /* Calculate the constant value if this is a const or uniform
3228 if (type
->qualifier
.flags
.q
.constant
3229 || type
->qualifier
.flags
.q
.uniform
) {
3230 ir_rvalue
*new_rhs
= validate_assignment(state
, initializer_loc
,
3232 if (new_rhs
!= NULL
) {
3235 ir_constant
*constant_value
= rhs
->constant_expression_value();
3236 if (!constant_value
) {
3237 /* If ARB_shading_language_420pack is enabled, initializers of
3238 * const-qualified local variables do not have to be constant
3239 * expressions. Const-qualified global variables must still be
3240 * initialized with constant expressions.
3242 if (!state
->ARB_shading_language_420pack_enable
3243 || state
->current_function
== NULL
) {
3244 _mesa_glsl_error(& initializer_loc
, state
,
3245 "initializer of %s variable `%s' must be a "
3246 "constant expression",
3247 (type
->qualifier
.flags
.q
.constant
)
3248 ? "const" : "uniform",
3250 if (var
->type
->is_numeric()) {
3251 /* Reduce cascading errors. */
3252 var
->constant_value
= ir_constant::zero(state
, var
->type
);
3256 rhs
= constant_value
;
3257 var
->constant_value
= constant_value
;
3260 if (var
->type
->is_numeric()) {
3261 /* Reduce cascading errors. */
3262 var
->constant_value
= ir_constant::zero(state
, var
->type
);
3267 if (rhs
&& !rhs
->type
->is_error()) {
3268 bool temp
= var
->data
.read_only
;
3269 if (type
->qualifier
.flags
.q
.constant
)
3270 var
->data
.read_only
= false;
3272 /* Never emit code to initialize a uniform.
3274 const glsl_type
*initializer_type
;
3275 if (!type
->qualifier
.flags
.q
.uniform
) {
3276 do_assignment(initializer_instructions
, state
,
3281 type
->get_location());
3282 initializer_type
= result
->type
;
3284 initializer_type
= rhs
->type
;
3286 var
->constant_initializer
= rhs
->constant_expression_value();
3287 var
->data
.has_initializer
= true;
3289 /* If the declared variable is an unsized array, it must inherrit
3290 * its full type from the initializer. A declaration such as
3292 * uniform float a[] = float[](1.0, 2.0, 3.0, 3.0);
3296 * uniform float a[4] = float[](1.0, 2.0, 3.0, 3.0);
3298 * The assignment generated in the if-statement (below) will also
3299 * automatically handle this case for non-uniforms.
3301 * If the declared variable is not an array, the types must
3302 * already match exactly. As a result, the type assignment
3303 * here can be done unconditionally. For non-uniforms the call
3304 * to do_assignment can change the type of the initializer (via
3305 * the implicit conversion rules). For uniforms the initializer
3306 * must be a constant expression, and the type of that expression
3307 * was validated above.
3309 var
->type
= initializer_type
;
3311 var
->data
.read_only
= temp
;
3318 validate_layout_qualifier_vertex_count(struct _mesa_glsl_parse_state
*state
,
3319 YYLTYPE loc
, ir_variable
*var
,
3320 unsigned num_vertices
,
3322 const char *var_category
)
3324 if (var
->type
->is_unsized_array()) {
3325 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec says:
3327 * All geometry shader input unsized array declarations will be
3328 * sized by an earlier input layout qualifier, when present, as per
3329 * the following table.
3331 * Followed by a table mapping each allowed input layout qualifier to
3332 * the corresponding input length.
3334 * Similarly for tessellation control shader outputs.
3336 if (num_vertices
!= 0)
3337 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
3340 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec
3341 * includes the following examples of compile-time errors:
3343 * // code sequence within one shader...
3344 * in vec4 Color1[]; // size unknown
3345 * ...Color1.length()...// illegal, length() unknown
3346 * in vec4 Color2[2]; // size is 2
3347 * ...Color1.length()...// illegal, Color1 still has no size
3348 * in vec4 Color3[3]; // illegal, input sizes are inconsistent
3349 * layout(lines) in; // legal, input size is 2, matching
3350 * in vec4 Color4[3]; // illegal, contradicts layout
3353 * To detect the case illustrated by Color3, we verify that the size of
3354 * an explicitly-sized array matches the size of any previously declared
3355 * explicitly-sized array. To detect the case illustrated by Color4, we
3356 * verify that the size of an explicitly-sized array is consistent with
3357 * any previously declared input layout.
3359 if (num_vertices
!= 0 && var
->type
->length
!= num_vertices
) {
3360 _mesa_glsl_error(&loc
, state
,
3361 "%s size contradicts previously declared layout "
3362 "(size is %u, but layout requires a size of %u)",
3363 var_category
, var
->type
->length
, num_vertices
);
3364 } else if (*size
!= 0 && var
->type
->length
!= *size
) {
3365 _mesa_glsl_error(&loc
, state
,
3366 "%s sizes are inconsistent (size is %u, but a "
3367 "previous declaration has size %u)",
3368 var_category
, var
->type
->length
, *size
);
3370 *size
= var
->type
->length
;
3376 handle_tess_ctrl_shader_output_decl(struct _mesa_glsl_parse_state
*state
,
3377 YYLTYPE loc
, ir_variable
*var
)
3379 unsigned num_vertices
= 0;
3381 if (state
->tcs_output_vertices_specified
) {
3382 num_vertices
= state
->out_qualifier
->vertices
;
3385 if (!var
->type
->is_array() && !var
->data
.patch
) {
3386 _mesa_glsl_error(&loc
, state
,
3387 "tessellation control shader outputs must be arrays");
3389 /* To avoid cascading failures, short circuit the checks below. */
3393 if (var
->data
.patch
)
3396 validate_layout_qualifier_vertex_count(state
, loc
, var
, num_vertices
,
3397 &state
->tcs_output_size
,
3398 "tessellation control shader output");
3402 * Do additional processing necessary for tessellation control/evaluation shader
3403 * input declarations. This covers both interface block arrays and bare input
3407 handle_tess_shader_input_decl(struct _mesa_glsl_parse_state
*state
,
3408 YYLTYPE loc
, ir_variable
*var
)
3410 if (!var
->type
->is_array() && !var
->data
.patch
) {
3411 _mesa_glsl_error(&loc
, state
,
3412 "per-vertex tessellation shader inputs must be arrays");
3413 /* Avoid cascading failures. */
3417 if (var
->data
.patch
)
3420 /* Unsized arrays are implicitly sized to gl_MaxPatchVertices. */
3421 if (var
->type
->is_unsized_array()) {
3422 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
3423 state
->Const
.MaxPatchVertices
);
3429 * Do additional processing necessary for geometry shader input declarations
3430 * (this covers both interface blocks arrays and bare input variables).
3433 handle_geometry_shader_input_decl(struct _mesa_glsl_parse_state
*state
,
3434 YYLTYPE loc
, ir_variable
*var
)
3436 unsigned num_vertices
= 0;
3438 if (state
->gs_input_prim_type_specified
) {
3439 num_vertices
= vertices_per_prim(state
->in_qualifier
->prim_type
);
3442 /* Geometry shader input variables must be arrays. Caller should have
3443 * reported an error for this.
3445 if (!var
->type
->is_array()) {
3446 assert(state
->error
);
3448 /* To avoid cascading failures, short circuit the checks below. */
3452 validate_layout_qualifier_vertex_count(state
, loc
, var
, num_vertices
,
3453 &state
->gs_input_size
,
3454 "geometry shader input");
3458 validate_identifier(const char *identifier
, YYLTYPE loc
,
3459 struct _mesa_glsl_parse_state
*state
)
3461 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
3463 * "Identifiers starting with "gl_" are reserved for use by
3464 * OpenGL, and may not be declared in a shader as either a
3465 * variable or a function."
3467 if (is_gl_identifier(identifier
)) {
3468 _mesa_glsl_error(&loc
, state
,
3469 "identifier `%s' uses reserved `gl_' prefix",
3471 } else if (strstr(identifier
, "__")) {
3472 /* From page 14 (page 20 of the PDF) of the GLSL 1.10
3475 * "In addition, all identifiers containing two
3476 * consecutive underscores (__) are reserved as
3477 * possible future keywords."
3479 * The intention is that names containing __ are reserved for internal
3480 * use by the implementation, and names prefixed with GL_ are reserved
3481 * for use by Khronos. Names simply containing __ are dangerous to use,
3482 * but should be allowed.
3484 * A future version of the GLSL specification will clarify this.
3486 _mesa_glsl_warning(&loc
, state
,
3487 "identifier `%s' uses reserved `__' string",
3493 precision_qualifier_allowed(const glsl_type
*type
)
3495 /* Precision qualifiers apply to floating point, integer and opaque
3498 * Section 4.5.2 (Precision Qualifiers) of the GLSL 1.30 spec says:
3499 * "Any floating point or any integer declaration can have the type
3500 * preceded by one of these precision qualifiers [...] Literal
3501 * constants do not have precision qualifiers. Neither do Boolean
3504 * Section 4.5 (Precision and Precision Qualifiers) of the GLSL 1.30
3507 * "Precision qualifiers are added for code portability with OpenGL
3508 * ES, not for functionality. They have the same syntax as in OpenGL
3511 * Section 8 (Built-In Functions) of the GLSL ES 1.00 spec says:
3513 * "uniform lowp sampler2D sampler;
3516 * lowp vec4 col = texture2D (sampler, coord);
3517 * // texture2D returns lowp"
3519 * From this, we infer that GLSL 1.30 (and later) should allow precision
3520 * qualifiers on sampler types just like float and integer types.
3522 return type
->is_float()
3523 || type
->is_integer()
3524 || type
->is_record()
3525 || type
->contains_opaque();
3529 ast_declarator_list::hir(exec_list
*instructions
,
3530 struct _mesa_glsl_parse_state
*state
)
3533 const struct glsl_type
*decl_type
;
3534 const char *type_name
= NULL
;
3535 ir_rvalue
*result
= NULL
;
3536 YYLTYPE loc
= this->get_location();
3538 /* From page 46 (page 52 of the PDF) of the GLSL 1.50 spec:
3540 * "To ensure that a particular output variable is invariant, it is
3541 * necessary to use the invariant qualifier. It can either be used to
3542 * qualify a previously declared variable as being invariant
3544 * invariant gl_Position; // make existing gl_Position be invariant"
3546 * In these cases the parser will set the 'invariant' flag in the declarator
3547 * list, and the type will be NULL.
3549 if (this->invariant
) {
3550 assert(this->type
== NULL
);
3552 if (state
->current_function
!= NULL
) {
3553 _mesa_glsl_error(& loc
, state
,
3554 "all uses of `invariant' keyword must be at global "
3558 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
3559 assert(decl
->array_specifier
== NULL
);
3560 assert(decl
->initializer
== NULL
);
3562 ir_variable
*const earlier
=
3563 state
->symbols
->get_variable(decl
->identifier
);
3564 if (earlier
== NULL
) {
3565 _mesa_glsl_error(& loc
, state
,
3566 "undeclared variable `%s' cannot be marked "
3567 "invariant", decl
->identifier
);
3568 } else if (!is_varying_var(earlier
, state
->stage
)) {
3569 _mesa_glsl_error(&loc
, state
,
3570 "`%s' cannot be marked invariant; interfaces between "
3571 "shader stages only.", decl
->identifier
);
3572 } else if (earlier
->data
.used
) {
3573 _mesa_glsl_error(& loc
, state
,
3574 "variable `%s' may not be redeclared "
3575 "`invariant' after being used",
3578 earlier
->data
.invariant
= true;
3582 /* Invariant redeclarations do not have r-values.
3587 if (this->precise
) {
3588 assert(this->type
== NULL
);
3590 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
3591 assert(decl
->array_specifier
== NULL
);
3592 assert(decl
->initializer
== NULL
);
3594 ir_variable
*const earlier
=
3595 state
->symbols
->get_variable(decl
->identifier
);
3596 if (earlier
== NULL
) {
3597 _mesa_glsl_error(& loc
, state
,
3598 "undeclared variable `%s' cannot be marked "
3599 "precise", decl
->identifier
);
3600 } else if (state
->current_function
!= NULL
&&
3601 !state
->symbols
->name_declared_this_scope(decl
->identifier
)) {
3602 /* Note: we have to check if we're in a function, since
3603 * builtins are treated as having come from another scope.
3605 _mesa_glsl_error(& loc
, state
,
3606 "variable `%s' from an outer scope may not be "
3607 "redeclared `precise' in this scope",
3609 } else if (earlier
->data
.used
) {
3610 _mesa_glsl_error(& loc
, state
,
3611 "variable `%s' may not be redeclared "
3612 "`precise' after being used",
3615 earlier
->data
.precise
= true;
3619 /* Precise redeclarations do not have r-values either. */
3623 assert(this->type
!= NULL
);
3624 assert(!this->invariant
);
3625 assert(!this->precise
);
3627 /* The type specifier may contain a structure definition. Process that
3628 * before any of the variable declarations.
3630 (void) this->type
->specifier
->hir(instructions
, state
);
3632 decl_type
= this->type
->glsl_type(& type_name
, state
);
3634 /* Section 4.3.7 "Buffer Variables" of the GLSL 4.30 spec:
3635 * "Buffer variables may only be declared inside interface blocks
3636 * (section 4.3.9 “Interface Blocks”), which are then referred to as
3637 * shader storage blocks. It is a compile-time error to declare buffer
3638 * variables at global scope (outside a block)."
3640 if (type
->qualifier
.flags
.q
.buffer
&& !decl_type
->is_interface()) {
3641 _mesa_glsl_error(&loc
, state
,
3642 "buffer variables cannot be declared outside "
3643 "interface blocks");
3646 /* An offset-qualified atomic counter declaration sets the default
3647 * offset for the next declaration within the same atomic counter
3650 if (decl_type
&& decl_type
->contains_atomic()) {
3651 if (type
->qualifier
.flags
.q
.explicit_binding
&&
3652 type
->qualifier
.flags
.q
.explicit_offset
)
3653 state
->atomic_counter_offsets
[type
->qualifier
.binding
] =
3654 type
->qualifier
.offset
;
3657 if (this->declarations
.is_empty()) {
3658 /* If there is no structure involved in the program text, there are two
3659 * possible scenarios:
3661 * - The program text contained something like 'vec4;'. This is an
3662 * empty declaration. It is valid but weird. Emit a warning.
3664 * - The program text contained something like 'S;' and 'S' is not the
3665 * name of a known structure type. This is both invalid and weird.
3668 * - The program text contained something like 'mediump float;'
3669 * when the programmer probably meant 'precision mediump
3670 * float;' Emit a warning with a description of what they
3671 * probably meant to do.
3673 * Note that if decl_type is NULL and there is a structure involved,
3674 * there must have been some sort of error with the structure. In this
3675 * case we assume that an error was already generated on this line of
3676 * code for the structure. There is no need to generate an additional,
3679 assert(this->type
->specifier
->structure
== NULL
|| decl_type
!= NULL
3682 if (decl_type
== NULL
) {
3683 _mesa_glsl_error(&loc
, state
,
3684 "invalid type `%s' in empty declaration",
3686 } else if (decl_type
->base_type
== GLSL_TYPE_ATOMIC_UINT
) {
3687 /* Empty atomic counter declarations are allowed and useful
3688 * to set the default offset qualifier.
3691 } else if (this->type
->qualifier
.precision
!= ast_precision_none
) {
3692 if (this->type
->specifier
->structure
!= NULL
) {
3693 _mesa_glsl_error(&loc
, state
,
3694 "precision qualifiers can't be applied "
3697 static const char *const precision_names
[] = {
3704 _mesa_glsl_warning(&loc
, state
,
3705 "empty declaration with precision qualifier, "
3706 "to set the default precision, use "
3707 "`precision %s %s;'",
3708 precision_names
[this->type
->qualifier
.precision
],
3711 } else if (this->type
->specifier
->structure
== NULL
) {
3712 _mesa_glsl_warning(&loc
, state
, "empty declaration");
3716 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
3717 const struct glsl_type
*var_type
;
3719 const char *identifier
= decl
->identifier
;
3720 /* FINISHME: Emit a warning if a variable declaration shadows a
3721 * FINISHME: declaration at a higher scope.
3724 if ((decl_type
== NULL
) || decl_type
->is_void()) {
3725 if (type_name
!= NULL
) {
3726 _mesa_glsl_error(& loc
, state
,
3727 "invalid type `%s' in declaration of `%s'",
3728 type_name
, decl
->identifier
);
3730 _mesa_glsl_error(& loc
, state
,
3731 "invalid type in declaration of `%s'",
3737 if (this->type
->qualifier
.flags
.q
.subroutine
) {
3741 t
= state
->symbols
->get_type(this->type
->specifier
->type_name
);
3743 _mesa_glsl_error(& loc
, state
,
3744 "invalid type in declaration of `%s'",
3746 name
= ralloc_asprintf(ctx
, "%s_%s", _mesa_shader_stage_to_subroutine_prefix(state
->stage
), decl
->identifier
);
3751 var_type
= process_array_type(&loc
, decl_type
, decl
->array_specifier
,
3754 var
= new(ctx
) ir_variable(var_type
, identifier
, ir_var_auto
);
3756 /* The 'varying in' and 'varying out' qualifiers can only be used with
3757 * ARB_geometry_shader4 and EXT_geometry_shader4, which we don't support
3760 if (this->type
->qualifier
.flags
.q
.varying
) {
3761 if (this->type
->qualifier
.flags
.q
.in
) {
3762 _mesa_glsl_error(& loc
, state
,
3763 "`varying in' qualifier in declaration of "
3764 "`%s' only valid for geometry shaders using "
3765 "ARB_geometry_shader4 or EXT_geometry_shader4",
3767 } else if (this->type
->qualifier
.flags
.q
.out
) {
3768 _mesa_glsl_error(& loc
, state
,
3769 "`varying out' qualifier in declaration of "
3770 "`%s' only valid for geometry shaders using "
3771 "ARB_geometry_shader4 or EXT_geometry_shader4",
3776 /* From page 22 (page 28 of the PDF) of the GLSL 1.10 specification;
3778 * "Global variables can only use the qualifiers const,
3779 * attribute, uniform, or varying. Only one may be
3782 * Local variables can only use the qualifier const."
3784 * This is relaxed in GLSL 1.30 and GLSL ES 3.00. It is also relaxed by
3785 * any extension that adds the 'layout' keyword.
3787 if (!state
->is_version(130, 300)
3788 && !state
->has_explicit_attrib_location()
3789 && !state
->has_separate_shader_objects()
3790 && !state
->ARB_fragment_coord_conventions_enable
) {
3791 if (this->type
->qualifier
.flags
.q
.out
) {
3792 _mesa_glsl_error(& loc
, state
,
3793 "`out' qualifier in declaration of `%s' "
3794 "only valid for function parameters in %s",
3795 decl
->identifier
, state
->get_version_string());
3797 if (this->type
->qualifier
.flags
.q
.in
) {
3798 _mesa_glsl_error(& loc
, state
,
3799 "`in' qualifier in declaration of `%s' "
3800 "only valid for function parameters in %s",
3801 decl
->identifier
, state
->get_version_string());
3803 /* FINISHME: Test for other invalid qualifiers. */
3806 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
,
3809 if (this->type
->qualifier
.flags
.q
.invariant
) {
3810 if (!is_varying_var(var
, state
->stage
)) {
3811 _mesa_glsl_error(&loc
, state
,
3812 "`%s' cannot be marked invariant; interfaces between "
3813 "shader stages only", var
->name
);
3817 if (state
->current_function
!= NULL
) {
3818 const char *mode
= NULL
;
3819 const char *extra
= "";
3821 /* There is no need to check for 'inout' here because the parser will
3822 * only allow that in function parameter lists.
3824 if (this->type
->qualifier
.flags
.q
.attribute
) {
3826 } else if (this->type
->qualifier
.flags
.q
.subroutine
) {
3827 mode
= "subroutine uniform";
3828 } else if (this->type
->qualifier
.flags
.q
.uniform
) {
3830 } else if (this->type
->qualifier
.flags
.q
.varying
) {
3832 } else if (this->type
->qualifier
.flags
.q
.in
) {
3834 extra
= " or in function parameter list";
3835 } else if (this->type
->qualifier
.flags
.q
.out
) {
3837 extra
= " or in function parameter list";
3841 _mesa_glsl_error(& loc
, state
,
3842 "%s variable `%s' must be declared at "
3844 mode
, var
->name
, extra
);
3846 } else if (var
->data
.mode
== ir_var_shader_in
) {
3847 var
->data
.read_only
= true;
3849 if (state
->stage
== MESA_SHADER_VERTEX
) {
3850 bool error_emitted
= false;
3852 /* From page 31 (page 37 of the PDF) of the GLSL 1.50 spec:
3854 * "Vertex shader inputs can only be float, floating-point
3855 * vectors, matrices, signed and unsigned integers and integer
3856 * vectors. Vertex shader inputs can also form arrays of these
3857 * types, but not structures."
3859 * From page 31 (page 27 of the PDF) of the GLSL 1.30 spec:
3861 * "Vertex shader inputs can only be float, floating-point
3862 * vectors, matrices, signed and unsigned integers and integer
3863 * vectors. They cannot be arrays or structures."
3865 * From page 23 (page 29 of the PDF) of the GLSL 1.20 spec:
3867 * "The attribute qualifier can be used only with float,
3868 * floating-point vectors, and matrices. Attribute variables
3869 * cannot be declared as arrays or structures."
3871 * From page 33 (page 39 of the PDF) of the GLSL ES 3.00 spec:
3873 * "Vertex shader inputs can only be float, floating-point
3874 * vectors, matrices, signed and unsigned integers and integer
3875 * vectors. Vertex shader inputs cannot be arrays or
3878 const glsl_type
*check_type
= var
->type
->without_array();
3880 switch (check_type
->base_type
) {
3881 case GLSL_TYPE_FLOAT
:
3883 case GLSL_TYPE_UINT
:
3885 if (state
->is_version(120, 300))
3887 case GLSL_TYPE_DOUBLE
:
3888 if (check_type
->base_type
== GLSL_TYPE_DOUBLE
&& (state
->is_version(410, 0) || state
->ARB_vertex_attrib_64bit_enable
))
3892 _mesa_glsl_error(& loc
, state
,
3893 "vertex shader input / attribute cannot have "
3895 var
->type
->is_array() ? "array of " : "",
3897 error_emitted
= true;
3900 if (!error_emitted
&& var
->type
->is_array() &&
3901 !state
->check_version(150, 0, &loc
,
3902 "vertex shader input / attribute "
3903 "cannot have array type")) {
3904 error_emitted
= true;
3906 } else if (state
->stage
== MESA_SHADER_GEOMETRY
) {
3907 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
3909 * Geometry shader input variables get the per-vertex values
3910 * written out by vertex shader output variables of the same
3911 * names. Since a geometry shader operates on a set of
3912 * vertices, each input varying variable (or input block, see
3913 * interface blocks below) needs to be declared as an array.
3915 if (!var
->type
->is_array()) {
3916 _mesa_glsl_error(&loc
, state
,
3917 "geometry shader inputs must be arrays");
3920 handle_geometry_shader_input_decl(state
, loc
, var
);
3921 } else if (state
->stage
== MESA_SHADER_FRAGMENT
) {
3922 /* From section 4.3.4 (Input Variables) of the GLSL ES 3.10 spec:
3924 * It is a compile-time error to declare a fragment shader
3925 * input with, or that contains, any of the following types:
3929 * * An array of arrays
3930 * * An array of structures
3931 * * A structure containing an array
3932 * * A structure containing a structure
3934 if (state
->es_shader
) {
3935 const glsl_type
*check_type
= var
->type
->without_array();
3936 if (check_type
->is_boolean() ||
3937 check_type
->contains_opaque()) {
3938 _mesa_glsl_error(&loc
, state
,
3939 "fragment shader input cannot have type %s",
3942 if (var
->type
->is_array() &&
3943 var
->type
->fields
.array
->is_array()) {
3944 _mesa_glsl_error(&loc
, state
,
3946 "cannot have an array of arrays",
3947 _mesa_shader_stage_to_string(state
->stage
));
3949 if (var
->type
->is_array() &&
3950 var
->type
->fields
.array
->is_record()) {
3951 _mesa_glsl_error(&loc
, state
,
3952 "fragment shader input "
3953 "cannot have an array of structs");
3955 if (var
->type
->is_record()) {
3956 for (unsigned i
= 0; i
< var
->type
->length
; i
++) {
3957 if (var
->type
->fields
.structure
[i
].type
->is_array() ||
3958 var
->type
->fields
.structure
[i
].type
->is_record())
3959 _mesa_glsl_error(&loc
, state
,
3960 "fragement shader input cannot have "
3961 "a struct that contains an "
3966 } else if (state
->stage
== MESA_SHADER_TESS_CTRL
||
3967 state
->stage
== MESA_SHADER_TESS_EVAL
) {
3968 handle_tess_shader_input_decl(state
, loc
, var
);
3970 } else if (var
->data
.mode
== ir_var_shader_out
) {
3971 const glsl_type
*check_type
= var
->type
->without_array();
3973 /* From section 4.3.6 (Output variables) of the GLSL 4.40 spec:
3975 * It is a compile-time error to declare a vertex, tessellation
3976 * evaluation, tessellation control, or geometry shader output
3977 * that contains any of the following:
3979 * * A Boolean type (bool, bvec2 ...)
3982 if (check_type
->is_boolean() || check_type
->contains_opaque())
3983 _mesa_glsl_error(&loc
, state
,
3984 "%s shader output cannot have type %s",
3985 _mesa_shader_stage_to_string(state
->stage
),
3988 /* From section 4.3.6 (Output variables) of the GLSL 4.40 spec:
3990 * It is a compile-time error to declare a fragment shader output
3991 * that contains any of the following:
3993 * * A Boolean type (bool, bvec2 ...)
3994 * * A double-precision scalar or vector (double, dvec2 ...)
3999 if (state
->stage
== MESA_SHADER_FRAGMENT
) {
4000 if (check_type
->is_record() || check_type
->is_matrix())
4001 _mesa_glsl_error(&loc
, state
,
4002 "fragment shader output "
4003 "cannot have struct or matrix type");
4004 switch (check_type
->base_type
) {
4005 case GLSL_TYPE_UINT
:
4007 case GLSL_TYPE_FLOAT
:
4010 _mesa_glsl_error(&loc
, state
,
4011 "fragment shader output cannot have "
4012 "type %s", check_type
->name
);
4016 /* From section 4.3.6 (Output Variables) of the GLSL ES 3.10 spec:
4018 * It is a compile-time error to declare a vertex shader output
4019 * with, or that contains, any of the following types:
4023 * * An array of arrays
4024 * * An array of structures
4025 * * A structure containing an array
4026 * * A structure containing a structure
4028 * It is a compile-time error to declare a fragment shader output
4029 * with, or that contains, any of the following types:
4035 * * An array of array
4037 if (state
->es_shader
) {
4038 if (var
->type
->is_array() &&
4039 var
->type
->fields
.array
->is_array()) {
4040 _mesa_glsl_error(&loc
, state
,
4042 "cannot have an array of arrays",
4043 _mesa_shader_stage_to_string(state
->stage
));
4045 if (state
->stage
== MESA_SHADER_VERTEX
) {
4046 if (var
->type
->is_array() &&
4047 var
->type
->fields
.array
->is_record()) {
4048 _mesa_glsl_error(&loc
, state
,
4049 "vertex shader output "
4050 "cannot have an array of structs");
4052 if (var
->type
->is_record()) {
4053 for (unsigned i
= 0; i
< var
->type
->length
; i
++) {
4054 if (var
->type
->fields
.structure
[i
].type
->is_array() ||
4055 var
->type
->fields
.structure
[i
].type
->is_record())
4056 _mesa_glsl_error(&loc
, state
,
4057 "vertex shader output cannot have a "
4058 "struct that contains an "
4065 if (state
->stage
== MESA_SHADER_TESS_CTRL
) {
4066 handle_tess_ctrl_shader_output_decl(state
, loc
, var
);
4068 } else if (var
->type
->contains_subroutine()) {
4069 /* declare subroutine uniforms as hidden */
4070 var
->data
.how_declared
= ir_var_hidden
;
4073 /* Integer fragment inputs must be qualified with 'flat'. In GLSL ES,
4074 * so must integer vertex outputs.
4076 * From section 4.3.4 ("Inputs") of the GLSL 1.50 spec:
4077 * "Fragment shader inputs that are signed or unsigned integers or
4078 * integer vectors must be qualified with the interpolation qualifier
4081 * From section 4.3.4 ("Input Variables") of the GLSL 3.00 ES spec:
4082 * "Fragment shader inputs that are, or contain, signed or unsigned
4083 * integers or integer vectors must be qualified with the
4084 * interpolation qualifier flat."
4086 * From section 4.3.6 ("Output Variables") of the GLSL 3.00 ES spec:
4087 * "Vertex shader outputs that are, or contain, signed or unsigned
4088 * integers or integer vectors must be qualified with the
4089 * interpolation qualifier flat."
4091 * Note that prior to GLSL 1.50, this requirement applied to vertex
4092 * outputs rather than fragment inputs. That creates problems in the
4093 * presence of geometry shaders, so we adopt the GLSL 1.50 rule for all
4094 * desktop GL shaders. For GLSL ES shaders, we follow the spec and
4095 * apply the restriction to both vertex outputs and fragment inputs.
4097 * Note also that the desktop GLSL specs are missing the text "or
4098 * contain"; this is presumably an oversight, since there is no
4099 * reasonable way to interpolate a fragment shader input that contains
4102 if (state
->is_version(130, 300) &&
4103 var
->type
->contains_integer() &&
4104 var
->data
.interpolation
!= INTERP_QUALIFIER_FLAT
&&
4105 ((state
->stage
== MESA_SHADER_FRAGMENT
&& var
->data
.mode
== ir_var_shader_in
)
4106 || (state
->stage
== MESA_SHADER_VERTEX
&& var
->data
.mode
== ir_var_shader_out
4107 && state
->es_shader
))) {
4108 const char *var_type
= (state
->stage
== MESA_SHADER_VERTEX
) ?
4109 "vertex output" : "fragment input";
4110 _mesa_glsl_error(&loc
, state
, "if a %s is (or contains) "
4111 "an integer, then it must be qualified with 'flat'",
4115 /* Double fragment inputs must be qualified with 'flat'. */
4116 if (var
->type
->contains_double() &&
4117 var
->data
.interpolation
!= INTERP_QUALIFIER_FLAT
&&
4118 state
->stage
== MESA_SHADER_FRAGMENT
&&
4119 var
->data
.mode
== ir_var_shader_in
) {
4120 _mesa_glsl_error(&loc
, state
, "if a fragment input is (or contains) "
4121 "a double, then it must be qualified with 'flat'",
4125 /* Interpolation qualifiers cannot be applied to 'centroid' and
4126 * 'centroid varying'.
4128 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
4129 * "interpolation qualifiers may only precede the qualifiers in,
4130 * centroid in, out, or centroid out in a declaration. They do not apply
4131 * to the deprecated storage qualifiers varying or centroid varying."
4133 * These deprecated storage qualifiers do not exist in GLSL ES 3.00.
4135 if (state
->is_version(130, 0)
4136 && this->type
->qualifier
.has_interpolation()
4137 && this->type
->qualifier
.flags
.q
.varying
) {
4139 const char *i
= this->type
->qualifier
.interpolation_string();
4142 if (this->type
->qualifier
.flags
.q
.centroid
)
4143 s
= "centroid varying";
4147 _mesa_glsl_error(&loc
, state
,
4148 "qualifier '%s' cannot be applied to the "
4149 "deprecated storage qualifier '%s'", i
, s
);
4153 /* Interpolation qualifiers can only apply to vertex shader outputs and
4154 * fragment shader inputs.
4156 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
4157 * "Outputs from a vertex shader (out) and inputs to a fragment
4158 * shader (in) can be further qualified with one or more of these
4159 * interpolation qualifiers"
4161 * From page 31 (page 37 of the PDF) of the GLSL ES 3.00 spec:
4162 * "These interpolation qualifiers may only precede the qualifiers
4163 * in, centroid in, out, or centroid out in a declaration. They do
4164 * not apply to inputs into a vertex shader or outputs from a
4167 if (state
->is_version(130, 300)
4168 && this->type
->qualifier
.has_interpolation()) {
4170 const char *i
= this->type
->qualifier
.interpolation_string();
4173 switch (state
->stage
) {
4174 case MESA_SHADER_VERTEX
:
4175 if (this->type
->qualifier
.flags
.q
.in
) {
4176 _mesa_glsl_error(&loc
, state
,
4177 "qualifier '%s' cannot be applied to vertex "
4178 "shader inputs", i
);
4181 case MESA_SHADER_FRAGMENT
:
4182 if (this->type
->qualifier
.flags
.q
.out
) {
4183 _mesa_glsl_error(&loc
, state
,
4184 "qualifier '%s' cannot be applied to fragment "
4185 "shader outputs", i
);
4194 /* From section 4.3.4 of the GLSL 4.00 spec:
4195 * "Input variables may not be declared using the patch in qualifier
4196 * in tessellation control or geometry shaders."
4198 * From section 4.3.6 of the GLSL 4.00 spec:
4199 * "It is an error to use patch out in a vertex, tessellation
4200 * evaluation, or geometry shader."
4202 * This doesn't explicitly forbid using them in a fragment shader, but
4203 * that's probably just an oversight.
4205 if (state
->stage
!= MESA_SHADER_TESS_EVAL
4206 && this->type
->qualifier
.flags
.q
.patch
4207 && this->type
->qualifier
.flags
.q
.in
) {
4209 _mesa_glsl_error(&loc
, state
, "'patch in' can only be used in a "
4210 "tessellation evaluation shader");
4213 if (state
->stage
!= MESA_SHADER_TESS_CTRL
4214 && this->type
->qualifier
.flags
.q
.patch
4215 && this->type
->qualifier
.flags
.q
.out
) {
4217 _mesa_glsl_error(&loc
, state
, "'patch out' can only be used in a "
4218 "tessellation control shader");
4221 /* Precision qualifiers exists only in GLSL versions 1.00 and >= 1.30.
4223 if (this->type
->qualifier
.precision
!= ast_precision_none
) {
4224 state
->check_precision_qualifiers_allowed(&loc
);
4228 /* If a precision qualifier is allowed on a type, it is allowed on
4229 * an array of that type.
4231 if (!(this->type
->qualifier
.precision
== ast_precision_none
4232 || precision_qualifier_allowed(var
->type
->without_array()))) {
4234 _mesa_glsl_error(&loc
, state
,
4235 "precision qualifiers apply only to floating point"
4236 ", integer and opaque types");
4239 /* From section 4.1.7 of the GLSL 4.40 spec:
4241 * "[Opaque types] can only be declared as function
4242 * parameters or uniform-qualified variables."
4244 if (var_type
->contains_opaque() &&
4245 !this->type
->qualifier
.flags
.q
.uniform
) {
4246 _mesa_glsl_error(&loc
, state
,
4247 "opaque variables must be declared uniform");
4250 /* Process the initializer and add its instructions to a temporary
4251 * list. This list will be added to the instruction stream (below) after
4252 * the declaration is added. This is done because in some cases (such as
4253 * redeclarations) the declaration may not actually be added to the
4254 * instruction stream.
4256 exec_list initializer_instructions
;
4258 /* Examine var name here since var may get deleted in the next call */
4259 bool var_is_gl_id
= is_gl_identifier(var
->name
);
4261 ir_variable
*earlier
=
4262 get_variable_being_redeclared(var
, decl
->get_location(), state
,
4263 false /* allow_all_redeclarations */);
4264 if (earlier
!= NULL
) {
4266 earlier
->data
.how_declared
== ir_var_declared_in_block
) {
4267 _mesa_glsl_error(&loc
, state
,
4268 "`%s' has already been redeclared using "
4269 "gl_PerVertex", earlier
->name
);
4271 earlier
->data
.how_declared
= ir_var_declared_normally
;
4274 if (decl
->initializer
!= NULL
) {
4275 result
= process_initializer((earlier
== NULL
) ? var
: earlier
,
4277 &initializer_instructions
, state
);
4280 /* From page 23 (page 29 of the PDF) of the GLSL 1.10 spec:
4282 * "It is an error to write to a const variable outside of
4283 * its declaration, so they must be initialized when
4286 if (this->type
->qualifier
.flags
.q
.constant
&& decl
->initializer
== NULL
) {
4287 _mesa_glsl_error(& loc
, state
,
4288 "const declaration of `%s' must be initialized",
4292 if (state
->es_shader
) {
4293 const glsl_type
*const t
= (earlier
== NULL
)
4294 ? var
->type
: earlier
->type
;
4296 if (t
->is_unsized_array())
4297 /* Section 10.17 of the GLSL ES 1.00 specification states that
4298 * unsized array declarations have been removed from the language.
4299 * Arrays that are sized using an initializer are still explicitly
4300 * sized. However, GLSL ES 1.00 does not allow array
4301 * initializers. That is only allowed in GLSL ES 3.00.
4303 * Section 4.1.9 (Arrays) of the GLSL ES 3.00 spec says:
4305 * "An array type can also be formed without specifying a size
4306 * if the definition includes an initializer:
4308 * float x[] = float[2] (1.0, 2.0); // declares an array of size 2
4309 * float y[] = float[] (1.0, 2.0, 3.0); // declares an array of size 3
4314 _mesa_glsl_error(& loc
, state
,
4315 "unsized array declarations are not allowed in "
4319 /* If the declaration is not a redeclaration, there are a few additional
4320 * semantic checks that must be applied. In addition, variable that was
4321 * created for the declaration should be added to the IR stream.
4323 if (earlier
== NULL
) {
4324 validate_identifier(decl
->identifier
, loc
, state
);
4326 /* Add the variable to the symbol table. Note that the initializer's
4327 * IR was already processed earlier (though it hasn't been emitted
4328 * yet), without the variable in scope.
4330 * This differs from most C-like languages, but it follows the GLSL
4331 * specification. From page 28 (page 34 of the PDF) of the GLSL 1.50
4334 * "Within a declaration, the scope of a name starts immediately
4335 * after the initializer if present or immediately after the name
4336 * being declared if not."
4338 if (!state
->symbols
->add_variable(var
)) {
4339 YYLTYPE loc
= this->get_location();
4340 _mesa_glsl_error(&loc
, state
, "name `%s' already taken in the "
4341 "current scope", decl
->identifier
);
4345 /* Push the variable declaration to the top. It means that all the
4346 * variable declarations will appear in a funny last-to-first order,
4347 * but otherwise we run into trouble if a function is prototyped, a
4348 * global var is decled, then the function is defined with usage of
4349 * the global var. See glslparsertest's CorrectModule.frag.
4351 instructions
->push_head(var
);
4354 instructions
->append_list(&initializer_instructions
);
4358 /* Generally, variable declarations do not have r-values. However,
4359 * one is used for the declaration in
4361 * while (bool b = some_condition()) {
4365 * so we return the rvalue from the last seen declaration here.
4372 ast_parameter_declarator::hir(exec_list
*instructions
,
4373 struct _mesa_glsl_parse_state
*state
)
4376 const struct glsl_type
*type
;
4377 const char *name
= NULL
;
4378 YYLTYPE loc
= this->get_location();
4380 type
= this->type
->glsl_type(& name
, state
);
4384 _mesa_glsl_error(& loc
, state
,
4385 "invalid type `%s' in declaration of `%s'",
4386 name
, this->identifier
);
4388 _mesa_glsl_error(& loc
, state
,
4389 "invalid type in declaration of `%s'",
4393 type
= glsl_type::error_type
;
4396 /* From page 62 (page 68 of the PDF) of the GLSL 1.50 spec:
4398 * "Functions that accept no input arguments need not use void in the
4399 * argument list because prototypes (or definitions) are required and
4400 * therefore there is no ambiguity when an empty argument list "( )" is
4401 * declared. The idiom "(void)" as a parameter list is provided for
4404 * Placing this check here prevents a void parameter being set up
4405 * for a function, which avoids tripping up checks for main taking
4406 * parameters and lookups of an unnamed symbol.
4408 if (type
->is_void()) {
4409 if (this->identifier
!= NULL
)
4410 _mesa_glsl_error(& loc
, state
,
4411 "named parameter cannot have type `void'");
4417 if (formal_parameter
&& (this->identifier
== NULL
)) {
4418 _mesa_glsl_error(& loc
, state
, "formal parameter lacks a name");
4422 /* This only handles "vec4 foo[..]". The earlier specifier->glsl_type(...)
4423 * call already handled the "vec4[..] foo" case.
4425 type
= process_array_type(&loc
, type
, this->array_specifier
, state
);
4427 if (!type
->is_error() && type
->is_unsized_array()) {
4428 _mesa_glsl_error(&loc
, state
, "arrays passed as parameters must have "
4430 type
= glsl_type::error_type
;
4434 ir_variable
*var
= new(ctx
)
4435 ir_variable(type
, this->identifier
, ir_var_function_in
);
4437 /* Apply any specified qualifiers to the parameter declaration. Note that
4438 * for function parameters the default mode is 'in'.
4440 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
, & loc
,
4443 /* From section 4.1.7 of the GLSL 4.40 spec:
4445 * "Opaque variables cannot be treated as l-values; hence cannot
4446 * be used as out or inout function parameters, nor can they be
4449 if ((var
->data
.mode
== ir_var_function_inout
|| var
->data
.mode
== ir_var_function_out
)
4450 && type
->contains_opaque()) {
4451 _mesa_glsl_error(&loc
, state
, "out and inout parameters cannot "
4452 "contain opaque variables");
4453 type
= glsl_type::error_type
;
4456 /* From page 39 (page 45 of the PDF) of the GLSL 1.10 spec:
4458 * "When calling a function, expressions that do not evaluate to
4459 * l-values cannot be passed to parameters declared as out or inout."
4461 * From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
4463 * "Other binary or unary expressions, non-dereferenced arrays,
4464 * function names, swizzles with repeated fields, and constants
4465 * cannot be l-values."
4467 * So for GLSL 1.10, passing an array as an out or inout parameter is not
4468 * allowed. This restriction is removed in GLSL 1.20, and in GLSL ES.
4470 if ((var
->data
.mode
== ir_var_function_inout
|| var
->data
.mode
== ir_var_function_out
)
4472 && !state
->check_version(120, 100, &loc
,
4473 "arrays cannot be out or inout parameters")) {
4474 type
= glsl_type::error_type
;
4477 instructions
->push_tail(var
);
4479 /* Parameter declarations do not have r-values.
4486 ast_parameter_declarator::parameters_to_hir(exec_list
*ast_parameters
,
4488 exec_list
*ir_parameters
,
4489 _mesa_glsl_parse_state
*state
)
4491 ast_parameter_declarator
*void_param
= NULL
;
4494 foreach_list_typed (ast_parameter_declarator
, param
, link
, ast_parameters
) {
4495 param
->formal_parameter
= formal
;
4496 param
->hir(ir_parameters
, state
);
4504 if ((void_param
!= NULL
) && (count
> 1)) {
4505 YYLTYPE loc
= void_param
->get_location();
4507 _mesa_glsl_error(& loc
, state
,
4508 "`void' parameter must be only parameter");
4514 emit_function(_mesa_glsl_parse_state
*state
, ir_function
*f
)
4516 /* IR invariants disallow function declarations or definitions
4517 * nested within other function definitions. But there is no
4518 * requirement about the relative order of function declarations
4519 * and definitions with respect to one another. So simply insert
4520 * the new ir_function block at the end of the toplevel instruction
4523 state
->toplevel_ir
->push_tail(f
);
4528 ast_function::hir(exec_list
*instructions
,
4529 struct _mesa_glsl_parse_state
*state
)
4532 ir_function
*f
= NULL
;
4533 ir_function_signature
*sig
= NULL
;
4534 exec_list hir_parameters
;
4535 YYLTYPE loc
= this->get_location();
4537 const char *const name
= identifier
;
4539 /* New functions are always added to the top-level IR instruction stream,
4540 * so this instruction list pointer is ignored. See also emit_function
4543 (void) instructions
;
4545 /* From page 21 (page 27 of the PDF) of the GLSL 1.20 spec,
4547 * "Function declarations (prototypes) cannot occur inside of functions;
4548 * they must be at global scope, or for the built-in functions, outside
4549 * the global scope."
4551 * From page 27 (page 33 of the PDF) of the GLSL ES 1.00.16 spec,
4553 * "User defined functions may only be defined within the global scope."
4555 * Note that this language does not appear in GLSL 1.10.
4557 if ((state
->current_function
!= NULL
) &&
4558 state
->is_version(120, 100)) {
4559 YYLTYPE loc
= this->get_location();
4560 _mesa_glsl_error(&loc
, state
,
4561 "declaration of function `%s' not allowed within "
4562 "function body", name
);
4565 validate_identifier(name
, this->get_location(), state
);
4567 /* Convert the list of function parameters to HIR now so that they can be
4568 * used below to compare this function's signature with previously seen
4569 * signatures for functions with the same name.
4571 ast_parameter_declarator::parameters_to_hir(& this->parameters
,
4573 & hir_parameters
, state
);
4575 const char *return_type_name
;
4576 const glsl_type
*return_type
=
4577 this->return_type
->glsl_type(& return_type_name
, state
);
4580 YYLTYPE loc
= this->get_location();
4581 _mesa_glsl_error(&loc
, state
,
4582 "function `%s' has undeclared return type `%s'",
4583 name
, return_type_name
);
4584 return_type
= glsl_type::error_type
;
4587 /* ARB_shader_subroutine states:
4588 * "Subroutine declarations cannot be prototyped. It is an error to prepend
4589 * subroutine(...) to a function declaration."
4591 if (this->return_type
->qualifier
.flags
.q
.subroutine_def
&& !is_definition
) {
4592 YYLTYPE loc
= this->get_location();
4593 _mesa_glsl_error(&loc
, state
,
4594 "function declaration `%s' cannot have subroutine prepended",
4598 /* From page 56 (page 62 of the PDF) of the GLSL 1.30 spec:
4599 * "No qualifier is allowed on the return type of a function."
4601 if (this->return_type
->has_qualifiers()) {
4602 YYLTYPE loc
= this->get_location();
4603 _mesa_glsl_error(& loc
, state
,
4604 "function `%s' return type has qualifiers", name
);
4607 /* Section 6.1 (Function Definitions) of the GLSL 1.20 spec says:
4609 * "Arrays are allowed as arguments and as the return type. In both
4610 * cases, the array must be explicitly sized."
4612 if (return_type
->is_unsized_array()) {
4613 YYLTYPE loc
= this->get_location();
4614 _mesa_glsl_error(& loc
, state
,
4615 "function `%s' return type array must be explicitly "
4619 /* From section 4.1.7 of the GLSL 4.40 spec:
4621 * "[Opaque types] can only be declared as function parameters
4622 * or uniform-qualified variables."
4624 if (return_type
->contains_opaque()) {
4625 YYLTYPE loc
= this->get_location();
4626 _mesa_glsl_error(&loc
, state
,
4627 "function `%s' return type can't contain an opaque type",
4631 /* Create an ir_function if one doesn't already exist. */
4632 f
= state
->symbols
->get_function(name
);
4634 f
= new(ctx
) ir_function(name
);
4635 if (!this->return_type
->qualifier
.flags
.q
.subroutine
) {
4636 if (!state
->symbols
->add_function(f
)) {
4637 /* This function name shadows a non-function use of the same name. */
4638 YYLTYPE loc
= this->get_location();
4639 _mesa_glsl_error(&loc
, state
, "function name `%s' conflicts with "
4640 "non-function", name
);
4644 emit_function(state
, f
);
4647 /* From GLSL ES 3.0 spec, chapter 6.1 "Function Definitions", page 71:
4649 * "A shader cannot redefine or overload built-in functions."
4651 * While in GLSL ES 1.0 specification, chapter 8 "Built-in Functions":
4653 * "User code can overload the built-in functions but cannot redefine
4656 if (state
->es_shader
&& state
->language_version
>= 300) {
4657 /* Local shader has no exact candidates; check the built-ins. */
4658 _mesa_glsl_initialize_builtin_functions();
4659 if (_mesa_glsl_find_builtin_function_by_name(name
)) {
4660 YYLTYPE loc
= this->get_location();
4661 _mesa_glsl_error(& loc
, state
,
4662 "A shader cannot redefine or overload built-in "
4663 "function `%s' in GLSL ES 3.00", name
);
4668 /* Verify that this function's signature either doesn't match a previously
4669 * seen signature for a function with the same name, or, if a match is found,
4670 * that the previously seen signature does not have an associated definition.
4672 if (state
->es_shader
|| f
->has_user_signature()) {
4673 sig
= f
->exact_matching_signature(state
, &hir_parameters
);
4675 const char *badvar
= sig
->qualifiers_match(&hir_parameters
);
4676 if (badvar
!= NULL
) {
4677 YYLTYPE loc
= this->get_location();
4679 _mesa_glsl_error(&loc
, state
, "function `%s' parameter `%s' "
4680 "qualifiers don't match prototype", name
, badvar
);
4683 if (sig
->return_type
!= return_type
) {
4684 YYLTYPE loc
= this->get_location();
4686 _mesa_glsl_error(&loc
, state
, "function `%s' return type doesn't "
4687 "match prototype", name
);
4690 if (sig
->is_defined
) {
4691 if (is_definition
) {
4692 YYLTYPE loc
= this->get_location();
4693 _mesa_glsl_error(& loc
, state
, "function `%s' redefined", name
);
4695 /* We just encountered a prototype that exactly matches a
4696 * function that's already been defined. This is redundant,
4697 * and we should ignore it.
4705 /* Verify the return type of main() */
4706 if (strcmp(name
, "main") == 0) {
4707 if (! return_type
->is_void()) {
4708 YYLTYPE loc
= this->get_location();
4710 _mesa_glsl_error(& loc
, state
, "main() must return void");
4713 if (!hir_parameters
.is_empty()) {
4714 YYLTYPE loc
= this->get_location();
4716 _mesa_glsl_error(& loc
, state
, "main() must not take any parameters");
4720 /* Finish storing the information about this new function in its signature.
4723 sig
= new(ctx
) ir_function_signature(return_type
);
4724 f
->add_signature(sig
);
4727 sig
->replace_parameters(&hir_parameters
);
4730 if (this->return_type
->qualifier
.flags
.q
.subroutine_def
) {
4733 f
->num_subroutine_types
= this->return_type
->qualifier
.subroutine_list
->declarations
.length();
4734 f
->subroutine_types
= ralloc_array(state
, const struct glsl_type
*,
4735 f
->num_subroutine_types
);
4737 foreach_list_typed(ast_declaration
, decl
, link
, &this->return_type
->qualifier
.subroutine_list
->declarations
) {
4738 const struct glsl_type
*type
;
4739 /* the subroutine type must be already declared */
4740 type
= state
->symbols
->get_type(decl
->identifier
);
4742 _mesa_glsl_error(& loc
, state
, "unknown type '%s' in subroutine function definition", decl
->identifier
);
4744 f
->subroutine_types
[idx
++] = type
;
4746 state
->subroutines
= (ir_function
**)reralloc(state
, state
->subroutines
,
4748 state
->num_subroutines
+ 1);
4749 state
->subroutines
[state
->num_subroutines
] = f
;
4750 state
->num_subroutines
++;
4754 if (this->return_type
->qualifier
.flags
.q
.subroutine
) {
4755 if (!state
->symbols
->add_type(this->identifier
, glsl_type::get_subroutine_instance(this->identifier
))) {
4756 _mesa_glsl_error(& loc
, state
, "type '%s' previously defined", this->identifier
);
4759 state
->subroutine_types
= (ir_function
**)reralloc(state
, state
->subroutine_types
,
4761 state
->num_subroutine_types
+ 1);
4762 state
->subroutine_types
[state
->num_subroutine_types
] = f
;
4763 state
->num_subroutine_types
++;
4765 f
->is_subroutine
= true;
4768 /* Function declarations (prototypes) do not have r-values.
4775 ast_function_definition::hir(exec_list
*instructions
,
4776 struct _mesa_glsl_parse_state
*state
)
4778 prototype
->is_definition
= true;
4779 prototype
->hir(instructions
, state
);
4781 ir_function_signature
*signature
= prototype
->signature
;
4782 if (signature
== NULL
)
4785 assert(state
->current_function
== NULL
);
4786 state
->current_function
= signature
;
4787 state
->found_return
= false;
4789 /* Duplicate parameters declared in the prototype as concrete variables.
4790 * Add these to the symbol table.
4792 state
->symbols
->push_scope();
4793 foreach_in_list(ir_variable
, var
, &signature
->parameters
) {
4794 assert(var
->as_variable() != NULL
);
4796 /* The only way a parameter would "exist" is if two parameters have
4799 if (state
->symbols
->name_declared_this_scope(var
->name
)) {
4800 YYLTYPE loc
= this->get_location();
4802 _mesa_glsl_error(& loc
, state
, "parameter `%s' redeclared", var
->name
);
4804 state
->symbols
->add_variable(var
);
4808 /* Convert the body of the function to HIR. */
4809 this->body
->hir(&signature
->body
, state
);
4810 signature
->is_defined
= true;
4812 state
->symbols
->pop_scope();
4814 assert(state
->current_function
== signature
);
4815 state
->current_function
= NULL
;
4817 if (!signature
->return_type
->is_void() && !state
->found_return
) {
4818 YYLTYPE loc
= this->get_location();
4819 _mesa_glsl_error(& loc
, state
, "function `%s' has non-void return type "
4820 "%s, but no return statement",
4821 signature
->function_name(),
4822 signature
->return_type
->name
);
4825 /* Function definitions do not have r-values.
4832 ast_jump_statement::hir(exec_list
*instructions
,
4833 struct _mesa_glsl_parse_state
*state
)
4840 assert(state
->current_function
);
4842 if (opt_return_value
) {
4843 ir_rvalue
*ret
= opt_return_value
->hir(instructions
, state
);
4845 /* The value of the return type can be NULL if the shader says
4846 * 'return foo();' and foo() is a function that returns void.
4848 * NOTE: The GLSL spec doesn't say that this is an error. The type
4849 * of the return value is void. If the return type of the function is
4850 * also void, then this should compile without error. Seriously.
4852 const glsl_type
*const ret_type
=
4853 (ret
== NULL
) ? glsl_type::void_type
: ret
->type
;
4855 /* Implicit conversions are not allowed for return values prior to
4856 * ARB_shading_language_420pack.
4858 if (state
->current_function
->return_type
!= ret_type
) {
4859 YYLTYPE loc
= this->get_location();
4861 if (state
->ARB_shading_language_420pack_enable
) {
4862 if (!apply_implicit_conversion(state
->current_function
->return_type
,
4864 _mesa_glsl_error(& loc
, state
,
4865 "could not implicitly convert return value "
4866 "to %s, in function `%s'",
4867 state
->current_function
->return_type
->name
,
4868 state
->current_function
->function_name());
4871 _mesa_glsl_error(& loc
, state
,
4872 "`return' with wrong type %s, in function `%s' "
4875 state
->current_function
->function_name(),
4876 state
->current_function
->return_type
->name
);
4878 } else if (state
->current_function
->return_type
->base_type
==
4880 YYLTYPE loc
= this->get_location();
4882 /* The ARB_shading_language_420pack, GLSL ES 3.0, and GLSL 4.20
4883 * specs add a clarification:
4885 * "A void function can only use return without a return argument, even if
4886 * the return argument has void type. Return statements only accept values:
4889 * void func2() { return func1(); } // illegal return statement"
4891 _mesa_glsl_error(& loc
, state
,
4892 "void functions can only use `return' without a "
4896 inst
= new(ctx
) ir_return(ret
);
4898 if (state
->current_function
->return_type
->base_type
!=
4900 YYLTYPE loc
= this->get_location();
4902 _mesa_glsl_error(& loc
, state
,
4903 "`return' with no value, in function %s returning "
4905 state
->current_function
->function_name());
4907 inst
= new(ctx
) ir_return
;
4910 state
->found_return
= true;
4911 instructions
->push_tail(inst
);
4916 if (state
->stage
!= MESA_SHADER_FRAGMENT
) {
4917 YYLTYPE loc
= this->get_location();
4919 _mesa_glsl_error(& loc
, state
,
4920 "`discard' may only appear in a fragment shader");
4922 instructions
->push_tail(new(ctx
) ir_discard
);
4927 if (mode
== ast_continue
&&
4928 state
->loop_nesting_ast
== NULL
) {
4929 YYLTYPE loc
= this->get_location();
4931 _mesa_glsl_error(& loc
, state
, "continue may only appear in a loop");
4932 } else if (mode
== ast_break
&&
4933 state
->loop_nesting_ast
== NULL
&&
4934 state
->switch_state
.switch_nesting_ast
== NULL
) {
4935 YYLTYPE loc
= this->get_location();
4937 _mesa_glsl_error(& loc
, state
,
4938 "break may only appear in a loop or a switch");
4940 /* For a loop, inline the for loop expression again, since we don't
4941 * know where near the end of the loop body the normal copy of it is
4942 * going to be placed. Same goes for the condition for a do-while
4945 if (state
->loop_nesting_ast
!= NULL
&&
4946 mode
== ast_continue
&& !state
->switch_state
.is_switch_innermost
) {
4947 if (state
->loop_nesting_ast
->rest_expression
) {
4948 state
->loop_nesting_ast
->rest_expression
->hir(instructions
,
4951 if (state
->loop_nesting_ast
->mode
==
4952 ast_iteration_statement::ast_do_while
) {
4953 state
->loop_nesting_ast
->condition_to_hir(instructions
, state
);
4957 if (state
->switch_state
.is_switch_innermost
&&
4958 mode
== ast_continue
) {
4959 /* Set 'continue_inside' to true. */
4960 ir_rvalue
*const true_val
= new (ctx
) ir_constant(true);
4961 ir_dereference_variable
*deref_continue_inside_var
=
4962 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
4963 instructions
->push_tail(new(ctx
) ir_assignment(deref_continue_inside_var
,
4966 /* Break out from the switch, continue for the loop will
4967 * be called right after switch. */
4968 ir_loop_jump
*const jump
=
4969 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
4970 instructions
->push_tail(jump
);
4972 } else if (state
->switch_state
.is_switch_innermost
&&
4973 mode
== ast_break
) {
4974 /* Force break out of switch by inserting a break. */
4975 ir_loop_jump
*const jump
=
4976 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
4977 instructions
->push_tail(jump
);
4979 ir_loop_jump
*const jump
=
4980 new(ctx
) ir_loop_jump((mode
== ast_break
)
4981 ? ir_loop_jump::jump_break
4982 : ir_loop_jump::jump_continue
);
4983 instructions
->push_tail(jump
);
4990 /* Jump instructions do not have r-values.
4997 ast_selection_statement::hir(exec_list
*instructions
,
4998 struct _mesa_glsl_parse_state
*state
)
5002 ir_rvalue
*const condition
= this->condition
->hir(instructions
, state
);
5004 /* From page 66 (page 72 of the PDF) of the GLSL 1.50 spec:
5006 * "Any expression whose type evaluates to a Boolean can be used as the
5007 * conditional expression bool-expression. Vector types are not accepted
5008 * as the expression to if."
5010 * The checks are separated so that higher quality diagnostics can be
5011 * generated for cases where both rules are violated.
5013 if (!condition
->type
->is_boolean() || !condition
->type
->is_scalar()) {
5014 YYLTYPE loc
= this->condition
->get_location();
5016 _mesa_glsl_error(& loc
, state
, "if-statement condition must be scalar "
5020 ir_if
*const stmt
= new(ctx
) ir_if(condition
);
5022 if (then_statement
!= NULL
) {
5023 state
->symbols
->push_scope();
5024 then_statement
->hir(& stmt
->then_instructions
, state
);
5025 state
->symbols
->pop_scope();
5028 if (else_statement
!= NULL
) {
5029 state
->symbols
->push_scope();
5030 else_statement
->hir(& stmt
->else_instructions
, state
);
5031 state
->symbols
->pop_scope();
5034 instructions
->push_tail(stmt
);
5036 /* if-statements do not have r-values.
5043 ast_switch_statement::hir(exec_list
*instructions
,
5044 struct _mesa_glsl_parse_state
*state
)
5048 ir_rvalue
*const test_expression
=
5049 this->test_expression
->hir(instructions
, state
);
5051 /* From page 66 (page 55 of the PDF) of the GLSL 1.50 spec:
5053 * "The type of init-expression in a switch statement must be a
5056 if (!test_expression
->type
->is_scalar() ||
5057 !test_expression
->type
->is_integer()) {
5058 YYLTYPE loc
= this->test_expression
->get_location();
5060 _mesa_glsl_error(& loc
,
5062 "switch-statement expression must be scalar "
5066 /* Track the switch-statement nesting in a stack-like manner.
5068 struct glsl_switch_state saved
= state
->switch_state
;
5070 state
->switch_state
.is_switch_innermost
= true;
5071 state
->switch_state
.switch_nesting_ast
= this;
5072 state
->switch_state
.labels_ht
= hash_table_ctor(0, hash_table_pointer_hash
,
5073 hash_table_pointer_compare
);
5074 state
->switch_state
.previous_default
= NULL
;
5076 /* Initalize is_fallthru state to false.
5078 ir_rvalue
*const is_fallthru_val
= new (ctx
) ir_constant(false);
5079 state
->switch_state
.is_fallthru_var
=
5080 new(ctx
) ir_variable(glsl_type::bool_type
,
5081 "switch_is_fallthru_tmp",
5083 instructions
->push_tail(state
->switch_state
.is_fallthru_var
);
5085 ir_dereference_variable
*deref_is_fallthru_var
=
5086 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
5087 instructions
->push_tail(new(ctx
) ir_assignment(deref_is_fallthru_var
,
5090 /* Initialize continue_inside state to false.
5092 state
->switch_state
.continue_inside
=
5093 new(ctx
) ir_variable(glsl_type::bool_type
,
5094 "continue_inside_tmp",
5096 instructions
->push_tail(state
->switch_state
.continue_inside
);
5098 ir_rvalue
*const false_val
= new (ctx
) ir_constant(false);
5099 ir_dereference_variable
*deref_continue_inside_var
=
5100 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
5101 instructions
->push_tail(new(ctx
) ir_assignment(deref_continue_inside_var
,
5104 state
->switch_state
.run_default
=
5105 new(ctx
) ir_variable(glsl_type::bool_type
,
5108 instructions
->push_tail(state
->switch_state
.run_default
);
5110 /* Loop around the switch is used for flow control. */
5111 ir_loop
* loop
= new(ctx
) ir_loop();
5112 instructions
->push_tail(loop
);
5114 /* Cache test expression.
5116 test_to_hir(&loop
->body_instructions
, state
);
5118 /* Emit code for body of switch stmt.
5120 body
->hir(&loop
->body_instructions
, state
);
5122 /* Insert a break at the end to exit loop. */
5123 ir_loop_jump
*jump
= new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
5124 loop
->body_instructions
.push_tail(jump
);
5126 /* If we are inside loop, check if continue got called inside switch. */
5127 if (state
->loop_nesting_ast
!= NULL
) {
5128 ir_dereference_variable
*deref_continue_inside
=
5129 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
5130 ir_if
*irif
= new(ctx
) ir_if(deref_continue_inside
);
5131 ir_loop_jump
*jump
= new(ctx
) ir_loop_jump(ir_loop_jump::jump_continue
);
5133 if (state
->loop_nesting_ast
!= NULL
) {
5134 if (state
->loop_nesting_ast
->rest_expression
) {
5135 state
->loop_nesting_ast
->rest_expression
->hir(&irif
->then_instructions
,
5138 if (state
->loop_nesting_ast
->mode
==
5139 ast_iteration_statement::ast_do_while
) {
5140 state
->loop_nesting_ast
->condition_to_hir(&irif
->then_instructions
, state
);
5143 irif
->then_instructions
.push_tail(jump
);
5144 instructions
->push_tail(irif
);
5147 hash_table_dtor(state
->switch_state
.labels_ht
);
5149 state
->switch_state
= saved
;
5151 /* Switch statements do not have r-values. */
5157 ast_switch_statement::test_to_hir(exec_list
*instructions
,
5158 struct _mesa_glsl_parse_state
*state
)
5162 /* Cache value of test expression. */
5163 ir_rvalue
*const test_val
=
5164 test_expression
->hir(instructions
,
5167 state
->switch_state
.test_var
= new(ctx
) ir_variable(test_val
->type
,
5170 ir_dereference_variable
*deref_test_var
=
5171 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
5173 instructions
->push_tail(state
->switch_state
.test_var
);
5174 instructions
->push_tail(new(ctx
) ir_assignment(deref_test_var
, test_val
));
5179 ast_switch_body::hir(exec_list
*instructions
,
5180 struct _mesa_glsl_parse_state
*state
)
5183 stmts
->hir(instructions
, state
);
5185 /* Switch bodies do not have r-values. */
5190 ast_case_statement_list::hir(exec_list
*instructions
,
5191 struct _mesa_glsl_parse_state
*state
)
5193 exec_list default_case
, after_default
, tmp
;
5195 foreach_list_typed (ast_case_statement
, case_stmt
, link
, & this->cases
) {
5196 case_stmt
->hir(&tmp
, state
);
5199 if (state
->switch_state
.previous_default
&& default_case
.is_empty()) {
5200 default_case
.append_list(&tmp
);
5204 /* If default case found, append 'after_default' list. */
5205 if (!default_case
.is_empty())
5206 after_default
.append_list(&tmp
);
5208 instructions
->append_list(&tmp
);
5211 /* Handle the default case. This is done here because default might not be
5212 * the last case. We need to add checks against following cases first to see
5213 * if default should be chosen or not.
5215 if (!default_case
.is_empty()) {
5217 ir_rvalue
*const true_val
= new (state
) ir_constant(true);
5218 ir_dereference_variable
*deref_run_default_var
=
5219 new(state
) ir_dereference_variable(state
->switch_state
.run_default
);
5221 /* Choose to run default case initially, following conditional
5222 * assignments might change this.
5224 ir_assignment
*const init_var
=
5225 new(state
) ir_assignment(deref_run_default_var
, true_val
);
5226 instructions
->push_tail(init_var
);
5228 /* Default case was the last one, no checks required. */
5229 if (after_default
.is_empty()) {
5230 instructions
->append_list(&default_case
);
5234 foreach_in_list(ir_instruction
, ir
, &after_default
) {
5235 ir_assignment
*assign
= ir
->as_assignment();
5240 /* Clone the check between case label and init expression. */
5241 ir_expression
*exp
= (ir_expression
*) assign
->condition
;
5242 ir_expression
*clone
= exp
->clone(state
, NULL
);
5244 ir_dereference_variable
*deref_var
=
5245 new(state
) ir_dereference_variable(state
->switch_state
.run_default
);
5246 ir_rvalue
*const false_val
= new (state
) ir_constant(false);
5248 ir_assignment
*const set_false
=
5249 new(state
) ir_assignment(deref_var
, false_val
, clone
);
5251 instructions
->push_tail(set_false
);
5254 /* Append default case and all cases after it. */
5255 instructions
->append_list(&default_case
);
5256 instructions
->append_list(&after_default
);
5259 /* Case statements do not have r-values. */
5264 ast_case_statement::hir(exec_list
*instructions
,
5265 struct _mesa_glsl_parse_state
*state
)
5267 labels
->hir(instructions
, state
);
5269 /* Guard case statements depending on fallthru state. */
5270 ir_dereference_variable
*const deref_fallthru_guard
=
5271 new(state
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
5272 ir_if
*const test_fallthru
= new(state
) ir_if(deref_fallthru_guard
);
5274 foreach_list_typed (ast_node
, stmt
, link
, & this->stmts
)
5275 stmt
->hir(& test_fallthru
->then_instructions
, state
);
5277 instructions
->push_tail(test_fallthru
);
5279 /* Case statements do not have r-values. */
5285 ast_case_label_list::hir(exec_list
*instructions
,
5286 struct _mesa_glsl_parse_state
*state
)
5288 foreach_list_typed (ast_case_label
, label
, link
, & this->labels
)
5289 label
->hir(instructions
, state
);
5291 /* Case labels do not have r-values. */
5296 ast_case_label::hir(exec_list
*instructions
,
5297 struct _mesa_glsl_parse_state
*state
)
5301 ir_dereference_variable
*deref_fallthru_var
=
5302 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
5304 ir_rvalue
*const true_val
= new(ctx
) ir_constant(true);
5306 /* If not default case, ... */
5307 if (this->test_value
!= NULL
) {
5308 /* Conditionally set fallthru state based on
5309 * comparison of cached test expression value to case label.
5311 ir_rvalue
*const label_rval
= this->test_value
->hir(instructions
, state
);
5312 ir_constant
*label_const
= label_rval
->constant_expression_value();
5315 YYLTYPE loc
= this->test_value
->get_location();
5317 _mesa_glsl_error(& loc
, state
,
5318 "switch statement case label must be a "
5319 "constant expression");
5321 /* Stuff a dummy value in to allow processing to continue. */
5322 label_const
= new(ctx
) ir_constant(0);
5324 ast_expression
*previous_label
= (ast_expression
*)
5325 hash_table_find(state
->switch_state
.labels_ht
,
5326 (void *)(uintptr_t)label_const
->value
.u
[0]);
5328 if (previous_label
) {
5329 YYLTYPE loc
= this->test_value
->get_location();
5330 _mesa_glsl_error(& loc
, state
, "duplicate case value");
5332 loc
= previous_label
->get_location();
5333 _mesa_glsl_error(& loc
, state
, "this is the previous case label");
5335 hash_table_insert(state
->switch_state
.labels_ht
,
5337 (void *)(uintptr_t)label_const
->value
.u
[0]);
5341 ir_dereference_variable
*deref_test_var
=
5342 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
5344 ir_expression
*test_cond
= new(ctx
) ir_expression(ir_binop_all_equal
,
5349 * From GLSL 4.40 specification section 6.2 ("Selection"):
5351 * "The type of the init-expression value in a switch statement must
5352 * be a scalar int or uint. The type of the constant-expression value
5353 * in a case label also must be a scalar int or uint. When any pair
5354 * of these values is tested for "equal value" and the types do not
5355 * match, an implicit conversion will be done to convert the int to a
5356 * uint (see section 4.1.10 “Implicit Conversions”) before the compare
5359 if (label_const
->type
!= state
->switch_state
.test_var
->type
) {
5360 YYLTYPE loc
= this->test_value
->get_location();
5362 const glsl_type
*type_a
= label_const
->type
;
5363 const glsl_type
*type_b
= state
->switch_state
.test_var
->type
;
5365 /* Check if int->uint implicit conversion is supported. */
5366 bool integer_conversion_supported
=
5367 glsl_type::int_type
->can_implicitly_convert_to(glsl_type::uint_type
,
5370 if ((!type_a
->is_integer() || !type_b
->is_integer()) ||
5371 !integer_conversion_supported
) {
5372 _mesa_glsl_error(&loc
, state
, "type mismatch with switch "
5373 "init-expression and case label (%s != %s)",
5374 type_a
->name
, type_b
->name
);
5376 /* Conversion of the case label. */
5377 if (type_a
->base_type
== GLSL_TYPE_INT
) {
5378 if (!apply_implicit_conversion(glsl_type::uint_type
,
5379 test_cond
->operands
[0], state
))
5380 _mesa_glsl_error(&loc
, state
, "implicit type conversion error");
5382 /* Conversion of the init-expression value. */
5383 if (!apply_implicit_conversion(glsl_type::uint_type
,
5384 test_cond
->operands
[1], state
))
5385 _mesa_glsl_error(&loc
, state
, "implicit type conversion error");
5390 ir_assignment
*set_fallthru_on_test
=
5391 new(ctx
) ir_assignment(deref_fallthru_var
, true_val
, test_cond
);
5393 instructions
->push_tail(set_fallthru_on_test
);
5394 } else { /* default case */
5395 if (state
->switch_state
.previous_default
) {
5396 YYLTYPE loc
= this->get_location();
5397 _mesa_glsl_error(& loc
, state
,
5398 "multiple default labels in one switch");
5400 loc
= state
->switch_state
.previous_default
->get_location();
5401 _mesa_glsl_error(& loc
, state
, "this is the first default label");
5403 state
->switch_state
.previous_default
= this;
5405 /* Set fallthru condition on 'run_default' bool. */
5406 ir_dereference_variable
*deref_run_default
=
5407 new(ctx
) ir_dereference_variable(state
->switch_state
.run_default
);
5408 ir_rvalue
*const cond_true
= new(ctx
) ir_constant(true);
5409 ir_expression
*test_cond
= new(ctx
) ir_expression(ir_binop_all_equal
,
5413 /* Set falltrhu state. */
5414 ir_assignment
*set_fallthru
=
5415 new(ctx
) ir_assignment(deref_fallthru_var
, true_val
, test_cond
);
5417 instructions
->push_tail(set_fallthru
);
5420 /* Case statements do not have r-values. */
5425 ast_iteration_statement::condition_to_hir(exec_list
*instructions
,
5426 struct _mesa_glsl_parse_state
*state
)
5430 if (condition
!= NULL
) {
5431 ir_rvalue
*const cond
=
5432 condition
->hir(instructions
, state
);
5435 || !cond
->type
->is_boolean() || !cond
->type
->is_scalar()) {
5436 YYLTYPE loc
= condition
->get_location();
5438 _mesa_glsl_error(& loc
, state
,
5439 "loop condition must be scalar boolean");
5441 /* As the first code in the loop body, generate a block that looks
5442 * like 'if (!condition) break;' as the loop termination condition.
5444 ir_rvalue
*const not_cond
=
5445 new(ctx
) ir_expression(ir_unop_logic_not
, cond
);
5447 ir_if
*const if_stmt
= new(ctx
) ir_if(not_cond
);
5449 ir_jump
*const break_stmt
=
5450 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
5452 if_stmt
->then_instructions
.push_tail(break_stmt
);
5453 instructions
->push_tail(if_stmt
);
5460 ast_iteration_statement::hir(exec_list
*instructions
,
5461 struct _mesa_glsl_parse_state
*state
)
5465 /* For-loops and while-loops start a new scope, but do-while loops do not.
5467 if (mode
!= ast_do_while
)
5468 state
->symbols
->push_scope();
5470 if (init_statement
!= NULL
)
5471 init_statement
->hir(instructions
, state
);
5473 ir_loop
*const stmt
= new(ctx
) ir_loop();
5474 instructions
->push_tail(stmt
);
5476 /* Track the current loop nesting. */
5477 ast_iteration_statement
*nesting_ast
= state
->loop_nesting_ast
;
5479 state
->loop_nesting_ast
= this;
5481 /* Likewise, indicate that following code is closest to a loop,
5482 * NOT closest to a switch.
5484 bool saved_is_switch_innermost
= state
->switch_state
.is_switch_innermost
;
5485 state
->switch_state
.is_switch_innermost
= false;
5487 if (mode
!= ast_do_while
)
5488 condition_to_hir(&stmt
->body_instructions
, state
);
5491 body
->hir(& stmt
->body_instructions
, state
);
5493 if (rest_expression
!= NULL
)
5494 rest_expression
->hir(& stmt
->body_instructions
, state
);
5496 if (mode
== ast_do_while
)
5497 condition_to_hir(&stmt
->body_instructions
, state
);
5499 if (mode
!= ast_do_while
)
5500 state
->symbols
->pop_scope();
5502 /* Restore previous nesting before returning. */
5503 state
->loop_nesting_ast
= nesting_ast
;
5504 state
->switch_state
.is_switch_innermost
= saved_is_switch_innermost
;
5506 /* Loops do not have r-values.
5513 * Determine if the given type is valid for establishing a default precision
5516 * From GLSL ES 3.00 section 4.5.4 ("Default Precision Qualifiers"):
5518 * "The precision statement
5520 * precision precision-qualifier type;
5522 * can be used to establish a default precision qualifier. The type field
5523 * can be either int or float or any of the sampler types, and the
5524 * precision-qualifier can be lowp, mediump, or highp."
5526 * GLSL ES 1.00 has similar language. GLSL 1.30 doesn't allow precision
5527 * qualifiers on sampler types, but this seems like an oversight (since the
5528 * intention of including these in GLSL 1.30 is to allow compatibility with ES
5529 * shaders). So we allow int, float, and all sampler types regardless of GLSL
5533 is_valid_default_precision_type(const struct glsl_type
*const type
)
5538 switch (type
->base_type
) {
5540 case GLSL_TYPE_FLOAT
:
5541 /* "int" and "float" are valid, but vectors and matrices are not. */
5542 return type
->vector_elements
== 1 && type
->matrix_columns
== 1;
5543 case GLSL_TYPE_SAMPLER
:
5544 case GLSL_TYPE_IMAGE
:
5545 case GLSL_TYPE_ATOMIC_UINT
:
5554 ast_type_specifier::hir(exec_list
*instructions
,
5555 struct _mesa_glsl_parse_state
*state
)
5557 if (this->default_precision
== ast_precision_none
&& this->structure
== NULL
)
5560 YYLTYPE loc
= this->get_location();
5562 /* If this is a precision statement, check that the type to which it is
5563 * applied is either float or int.
5565 * From section 4.5.3 of the GLSL 1.30 spec:
5566 * "The precision statement
5567 * precision precision-qualifier type;
5568 * can be used to establish a default precision qualifier. The type
5569 * field can be either int or float [...]. Any other types or
5570 * qualifiers will result in an error.
5572 if (this->default_precision
!= ast_precision_none
) {
5573 if (!state
->check_precision_qualifiers_allowed(&loc
))
5576 if (this->structure
!= NULL
) {
5577 _mesa_glsl_error(&loc
, state
,
5578 "precision qualifiers do not apply to structures");
5582 if (this->array_specifier
!= NULL
) {
5583 _mesa_glsl_error(&loc
, state
,
5584 "default precision statements do not apply to "
5589 const struct glsl_type
*const type
=
5590 state
->symbols
->get_type(this->type_name
);
5591 if (!is_valid_default_precision_type(type
)) {
5592 _mesa_glsl_error(&loc
, state
,
5593 "default precision statements apply only to "
5594 "float, int, and opaque types");
5598 if (type
->base_type
== GLSL_TYPE_FLOAT
5600 && state
->stage
== MESA_SHADER_FRAGMENT
) {
5601 /* Section 4.5.3 (Default Precision Qualifiers) of the GLSL ES 1.00
5604 * "The fragment language has no default precision qualifier for
5605 * floating point types."
5607 * As a result, we have to track whether or not default precision has
5608 * been specified for float in GLSL ES fragment shaders.
5610 * Earlier in that same section, the spec says:
5612 * "Non-precision qualified declarations will use the precision
5613 * qualifier specified in the most recent precision statement
5614 * that is still in scope. The precision statement has the same
5615 * scoping rules as variable declarations. If it is declared
5616 * inside a compound statement, its effect stops at the end of
5617 * the innermost statement it was declared in. Precision
5618 * statements in nested scopes override precision statements in
5619 * outer scopes. Multiple precision statements for the same basic
5620 * type can appear inside the same scope, with later statements
5621 * overriding earlier statements within that scope."
5623 * Default precision specifications follow the same scope rules as
5624 * variables. So, we can track the state of the default float
5625 * precision in the symbol table, and the rules will just work. This
5626 * is a slight abuse of the symbol table, but it has the semantics
5629 ir_variable
*const junk
=
5630 new(state
) ir_variable(type
, "#default precision",
5633 state
->symbols
->add_variable(junk
);
5636 /* FINISHME: Translate precision statements into IR. */
5640 /* _mesa_ast_set_aggregate_type() sets the <structure> field so that
5641 * process_record_constructor() can do type-checking on C-style initializer
5642 * expressions of structs, but ast_struct_specifier should only be translated
5643 * to HIR if it is declaring the type of a structure.
5645 * The ->is_declaration field is false for initializers of variables
5646 * declared separately from the struct's type definition.
5648 * struct S { ... }; (is_declaration = true)
5649 * struct T { ... } t = { ... }; (is_declaration = true)
5650 * S s = { ... }; (is_declaration = false)
5652 if (this->structure
!= NULL
&& this->structure
->is_declaration
)
5653 return this->structure
->hir(instructions
, state
);
5660 * Process a structure or interface block tree into an array of structure fields
5662 * After parsing, where there are some syntax differnces, structures and
5663 * interface blocks are almost identical. They are similar enough that the
5664 * AST for each can be processed the same way into a set of
5665 * \c glsl_struct_field to describe the members.
5667 * If we're processing an interface block, var_mode should be the type of the
5668 * interface block (ir_var_shader_in, ir_var_shader_out, ir_var_uniform or
5669 * ir_var_shader_storage). If we're processing a structure, var_mode should be
5673 * The number of fields processed. A pointer to the array structure fields is
5674 * stored in \c *fields_ret.
5677 ast_process_structure_or_interface_block(exec_list
*instructions
,
5678 struct _mesa_glsl_parse_state
*state
,
5679 exec_list
*declarations
,
5681 glsl_struct_field
**fields_ret
,
5683 enum glsl_matrix_layout matrix_layout
,
5684 bool allow_reserved_names
,
5685 ir_variable_mode var_mode
,
5686 ast_type_qualifier
*layout
)
5688 unsigned decl_count
= 0;
5690 /* For blocks that accept memory qualifiers (i.e. shader storage), verify
5691 * that we don't have incompatible qualifiers
5693 if (layout
&& layout
->flags
.q
.read_only
&& layout
->flags
.q
.write_only
) {
5694 _mesa_glsl_error(&loc
, state
,
5695 "Interface block sets both readonly and writeonly");
5698 /* Make an initial pass over the list of fields to determine how
5699 * many there are. Each element in this list is an ast_declarator_list.
5700 * This means that we actually need to count the number of elements in the
5701 * 'declarations' list in each of the elements.
5703 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
5704 decl_count
+= decl_list
->declarations
.length();
5707 /* Allocate storage for the fields and process the field
5708 * declarations. As the declarations are processed, try to also convert
5709 * the types to HIR. This ensures that structure definitions embedded in
5710 * other structure definitions or in interface blocks are processed.
5712 glsl_struct_field
*const fields
= ralloc_array(state
, glsl_struct_field
,
5716 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
5717 const char *type_name
;
5719 decl_list
->type
->specifier
->hir(instructions
, state
);
5721 /* Section 10.9 of the GLSL ES 1.00 specification states that
5722 * embedded structure definitions have been removed from the language.
5724 if (state
->es_shader
&& decl_list
->type
->specifier
->structure
!= NULL
) {
5725 _mesa_glsl_error(&loc
, state
, "embedded structure definitions are "
5726 "not allowed in GLSL ES 1.00");
5729 const glsl_type
*decl_type
=
5730 decl_list
->type
->glsl_type(& type_name
, state
);
5732 foreach_list_typed (ast_declaration
, decl
, link
,
5733 &decl_list
->declarations
) {
5734 if (!allow_reserved_names
)
5735 validate_identifier(decl
->identifier
, loc
, state
);
5737 /* From section 4.3.9 of the GLSL 4.40 spec:
5739 * "[In interface blocks] opaque types are not allowed."
5741 * It should be impossible for decl_type to be NULL here. Cases that
5742 * might naturally lead to decl_type being NULL, especially for the
5743 * is_interface case, will have resulted in compilation having
5744 * already halted due to a syntax error.
5748 if (is_interface
&& decl_type
->contains_opaque()) {
5749 YYLTYPE loc
= decl_list
->get_location();
5750 _mesa_glsl_error(&loc
, state
,
5751 "uniform/buffer in non-default interface block contains "
5755 if (decl_type
->contains_atomic()) {
5756 /* From section 4.1.7.3 of the GLSL 4.40 spec:
5758 * "Members of structures cannot be declared as atomic counter
5761 YYLTYPE loc
= decl_list
->get_location();
5762 _mesa_glsl_error(&loc
, state
, "atomic counter in structure, "
5763 "shader storage block or uniform block");
5766 if (decl_type
->contains_image()) {
5767 /* FINISHME: Same problem as with atomic counters.
5768 * FINISHME: Request clarification from Khronos and add
5769 * FINISHME: spec quotation here.
5771 YYLTYPE loc
= decl_list
->get_location();
5772 _mesa_glsl_error(&loc
, state
,
5773 "image in structure, shader storage block or "
5777 const struct ast_type_qualifier
*const qual
=
5778 & decl_list
->type
->qualifier
;
5780 if (qual
->flags
.q
.explicit_binding
)
5781 validate_binding_qualifier(state
, &loc
, decl_type
, qual
);
5783 if (qual
->flags
.q
.std140
||
5784 qual
->flags
.q
.std430
||
5785 qual
->flags
.q
.packed
||
5786 qual
->flags
.q
.shared
) {
5787 _mesa_glsl_error(&loc
, state
,
5788 "uniform/shader storage block layout qualifiers "
5789 "std140, std430, packed, and shared can only be "
5790 "applied to uniform/shader storage blocks, not "
5794 if (qual
->flags
.q
.constant
) {
5795 YYLTYPE loc
= decl_list
->get_location();
5796 _mesa_glsl_error(&loc
, state
,
5797 "const storage qualifier cannot be applied "
5798 "to struct or interface block members");
5801 const struct glsl_type
*field_type
=
5802 process_array_type(&loc
, decl_type
, decl
->array_specifier
, state
);
5803 fields
[i
].type
= field_type
;
5804 fields
[i
].name
= decl
->identifier
;
5805 fields
[i
].location
= -1;
5806 fields
[i
].interpolation
=
5807 interpret_interpolation_qualifier(qual
, var_mode
, state
, &loc
);
5808 fields
[i
].centroid
= qual
->flags
.q
.centroid
? 1 : 0;
5809 fields
[i
].sample
= qual
->flags
.q
.sample
? 1 : 0;
5810 fields
[i
].patch
= qual
->flags
.q
.patch
? 1 : 0;
5812 /* Only save explicitly defined streams in block's field */
5813 fields
[i
].stream
= qual
->flags
.q
.explicit_stream
? qual
->stream
: -1;
5815 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
5816 if (!qual
->flags
.q
.uniform
&& !qual
->flags
.q
.buffer
) {
5817 _mesa_glsl_error(&loc
, state
,
5818 "row_major and column_major can only be "
5819 "applied to interface blocks");
5821 validate_matrix_layout_for_type(state
, &loc
, field_type
, NULL
);
5824 if (qual
->flags
.q
.uniform
&& qual
->has_interpolation()) {
5825 _mesa_glsl_error(&loc
, state
,
5826 "interpolation qualifiers cannot be used "
5827 "with uniform interface blocks");
5830 if ((qual
->flags
.q
.uniform
|| !is_interface
) &&
5831 qual
->has_auxiliary_storage()) {
5832 _mesa_glsl_error(&loc
, state
,
5833 "auxiliary storage qualifiers cannot be used "
5834 "in uniform blocks or structures.");
5837 /* Propogate row- / column-major information down the fields of the
5838 * structure or interface block. Structures need this data because
5839 * the structure may contain a structure that contains ... a matrix
5840 * that need the proper layout.
5842 if (field_type
->without_array()->is_matrix()
5843 || field_type
->without_array()->is_record()) {
5844 /* If no layout is specified for the field, inherit the layout
5847 fields
[i
].matrix_layout
= matrix_layout
;
5849 if (qual
->flags
.q
.row_major
)
5850 fields
[i
].matrix_layout
= GLSL_MATRIX_LAYOUT_ROW_MAJOR
;
5851 else if (qual
->flags
.q
.column_major
)
5852 fields
[i
].matrix_layout
= GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
;
5854 /* If we're processing an interface block, the matrix layout must
5855 * be decided by this point.
5857 assert(!is_interface
5858 || fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_ROW_MAJOR
5859 || fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
);
5862 /* Image qualifiers are allowed on buffer variables, which can only
5863 * be defined inside shader storage buffer objects
5865 if (layout
&& var_mode
== ir_var_shader_storage
) {
5866 if (qual
->flags
.q
.read_only
&& qual
->flags
.q
.write_only
) {
5867 _mesa_glsl_error(&loc
, state
,
5868 "buffer variable `%s' can't be "
5869 "readonly and writeonly.", fields
[i
].name
);
5872 /* For readonly and writeonly qualifiers the field definition,
5873 * if set, overwrites the layout qualifier.
5875 bool read_only
= layout
->flags
.q
.read_only
;
5876 bool write_only
= layout
->flags
.q
.write_only
;
5878 if (qual
->flags
.q
.read_only
) {
5881 } else if (qual
->flags
.q
.write_only
) {
5886 fields
[i
].image_read_only
= read_only
;
5887 fields
[i
].image_write_only
= write_only
;
5889 /* For other qualifiers, we set the flag if either the layout
5890 * qualifier or the field qualifier are set
5892 fields
[i
].image_coherent
= qual
->flags
.q
.coherent
||
5893 layout
->flags
.q
.coherent
;
5894 fields
[i
].image_volatile
= qual
->flags
.q
._volatile
||
5895 layout
->flags
.q
._volatile
;
5896 fields
[i
].image_restrict
= qual
->flags
.q
.restrict_flag
||
5897 layout
->flags
.q
.restrict_flag
;
5904 assert(i
== decl_count
);
5906 *fields_ret
= fields
;
5912 ast_struct_specifier::hir(exec_list
*instructions
,
5913 struct _mesa_glsl_parse_state
*state
)
5915 YYLTYPE loc
= this->get_location();
5917 /* Section 4.1.8 (Structures) of the GLSL 1.10 spec says:
5919 * "Anonymous structures are not supported; so embedded structures must
5920 * have a declarator. A name given to an embedded struct is scoped at
5921 * the same level as the struct it is embedded in."
5923 * The same section of the GLSL 1.20 spec says:
5925 * "Anonymous structures are not supported. Embedded structures are not
5928 * struct S { float f; };
5930 * S; // Error: anonymous structures disallowed
5931 * struct { ... }; // Error: embedded structures disallowed
5932 * S s; // Okay: nested structures with name are allowed
5935 * The GLSL ES 1.00 and 3.00 specs have similar langauge and examples. So,
5936 * we allow embedded structures in 1.10 only.
5938 if (state
->language_version
!= 110 && state
->struct_specifier_depth
!= 0)
5939 _mesa_glsl_error(&loc
, state
,
5940 "embedded structure declarations are not allowed");
5942 state
->struct_specifier_depth
++;
5944 glsl_struct_field
*fields
;
5945 unsigned decl_count
=
5946 ast_process_structure_or_interface_block(instructions
,
5948 &this->declarations
,
5952 GLSL_MATRIX_LAYOUT_INHERITED
,
5953 false /* allow_reserved_names */,
5957 validate_identifier(this->name
, loc
, state
);
5959 const glsl_type
*t
=
5960 glsl_type::get_record_instance(fields
, decl_count
, this->name
);
5962 if (!state
->symbols
->add_type(name
, t
)) {
5963 _mesa_glsl_error(& loc
, state
, "struct `%s' previously defined", name
);
5965 const glsl_type
**s
= reralloc(state
, state
->user_structures
,
5967 state
->num_user_structures
+ 1);
5969 s
[state
->num_user_structures
] = t
;
5970 state
->user_structures
= s
;
5971 state
->num_user_structures
++;
5975 state
->struct_specifier_depth
--;
5977 /* Structure type definitions do not have r-values.
5984 * Visitor class which detects whether a given interface block has been used.
5986 class interface_block_usage_visitor
: public ir_hierarchical_visitor
5989 interface_block_usage_visitor(ir_variable_mode mode
, const glsl_type
*block
)
5990 : mode(mode
), block(block
), found(false)
5994 virtual ir_visitor_status
visit(ir_dereference_variable
*ir
)
5996 if (ir
->var
->data
.mode
== mode
&& ir
->var
->get_interface_type() == block
) {
6000 return visit_continue
;
6003 bool usage_found() const
6009 ir_variable_mode mode
;
6010 const glsl_type
*block
;
6015 is_unsized_array_last_element(ir_variable
*v
)
6017 const glsl_type
*interface_type
= v
->get_interface_type();
6018 int length
= interface_type
->length
;
6020 assert(v
->type
->is_unsized_array());
6022 /* Check if it is the last element of the interface */
6023 if (strcmp(interface_type
->fields
.structure
[length
-1].name
, v
->name
) == 0)
6029 ast_interface_block::hir(exec_list
*instructions
,
6030 struct _mesa_glsl_parse_state
*state
)
6032 YYLTYPE loc
= this->get_location();
6034 /* Interface blocks must be declared at global scope */
6035 if (state
->current_function
!= NULL
) {
6036 _mesa_glsl_error(&loc
, state
,
6037 "Interface block `%s' must be declared "
6042 if (!this->layout
.flags
.q
.buffer
&&
6043 this->layout
.flags
.q
.std430
) {
6044 _mesa_glsl_error(&loc
, state
,
6045 "std430 storage block layout qualifier is supported "
6046 "only for shader storage blocks");
6049 /* The ast_interface_block has a list of ast_declarator_lists. We
6050 * need to turn those into ir_variables with an association
6051 * with this uniform block.
6053 enum glsl_interface_packing packing
;
6054 if (this->layout
.flags
.q
.shared
) {
6055 packing
= GLSL_INTERFACE_PACKING_SHARED
;
6056 } else if (this->layout
.flags
.q
.packed
) {
6057 packing
= GLSL_INTERFACE_PACKING_PACKED
;
6058 } else if (this->layout
.flags
.q
.std430
) {
6059 packing
= GLSL_INTERFACE_PACKING_STD430
;
6061 /* The default layout is std140.
6063 packing
= GLSL_INTERFACE_PACKING_STD140
;
6066 ir_variable_mode var_mode
;
6067 const char *iface_type_name
;
6068 if (this->layout
.flags
.q
.in
) {
6069 var_mode
= ir_var_shader_in
;
6070 iface_type_name
= "in";
6071 } else if (this->layout
.flags
.q
.out
) {
6072 var_mode
= ir_var_shader_out
;
6073 iface_type_name
= "out";
6074 } else if (this->layout
.flags
.q
.uniform
) {
6075 var_mode
= ir_var_uniform
;
6076 iface_type_name
= "uniform";
6077 } else if (this->layout
.flags
.q
.buffer
) {
6078 var_mode
= ir_var_shader_storage
;
6079 iface_type_name
= "buffer";
6081 var_mode
= ir_var_auto
;
6082 iface_type_name
= "UNKNOWN";
6083 assert(!"interface block layout qualifier not found!");
6086 enum glsl_matrix_layout matrix_layout
= GLSL_MATRIX_LAYOUT_INHERITED
;
6087 if (this->layout
.flags
.q
.row_major
)
6088 matrix_layout
= GLSL_MATRIX_LAYOUT_ROW_MAJOR
;
6089 else if (this->layout
.flags
.q
.column_major
)
6090 matrix_layout
= GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
;
6092 bool redeclaring_per_vertex
= strcmp(this->block_name
, "gl_PerVertex") == 0;
6093 exec_list declared_variables
;
6094 glsl_struct_field
*fields
;
6096 /* Treat an interface block as one level of nesting, so that embedded struct
6097 * specifiers will be disallowed.
6099 state
->struct_specifier_depth
++;
6101 unsigned int num_variables
=
6102 ast_process_structure_or_interface_block(&declared_variables
,
6104 &this->declarations
,
6109 redeclaring_per_vertex
,
6113 state
->struct_specifier_depth
--;
6115 if (!redeclaring_per_vertex
) {
6116 validate_identifier(this->block_name
, loc
, state
);
6118 /* From section 4.3.9 ("Interface Blocks") of the GLSL 4.50 spec:
6120 * "Block names have no other use within a shader beyond interface
6121 * matching; it is a compile-time error to use a block name at global
6122 * scope for anything other than as a block name."
6124 ir_variable
*var
= state
->symbols
->get_variable(this->block_name
);
6125 if (var
&& !var
->type
->is_interface()) {
6126 _mesa_glsl_error(&loc
, state
, "Block name `%s' is "
6127 "already used in the scope.",
6132 const glsl_type
*earlier_per_vertex
= NULL
;
6133 if (redeclaring_per_vertex
) {
6134 /* Find the previous declaration of gl_PerVertex. If we're redeclaring
6135 * the named interface block gl_in, we can find it by looking at the
6136 * previous declaration of gl_in. Otherwise we can find it by looking
6137 * at the previous decalartion of any of the built-in outputs,
6140 * Also check that the instance name and array-ness of the redeclaration
6144 case ir_var_shader_in
:
6145 if (ir_variable
*earlier_gl_in
=
6146 state
->symbols
->get_variable("gl_in")) {
6147 earlier_per_vertex
= earlier_gl_in
->get_interface_type();
6149 _mesa_glsl_error(&loc
, state
,
6150 "redeclaration of gl_PerVertex input not allowed "
6152 _mesa_shader_stage_to_string(state
->stage
));
6154 if (this->instance_name
== NULL
||
6155 strcmp(this->instance_name
, "gl_in") != 0 || this->array_specifier
== NULL
) {
6156 _mesa_glsl_error(&loc
, state
,
6157 "gl_PerVertex input must be redeclared as "
6161 case ir_var_shader_out
:
6162 if (ir_variable
*earlier_gl_Position
=
6163 state
->symbols
->get_variable("gl_Position")) {
6164 earlier_per_vertex
= earlier_gl_Position
->get_interface_type();
6165 } else if (ir_variable
*earlier_gl_out
=
6166 state
->symbols
->get_variable("gl_out")) {
6167 earlier_per_vertex
= earlier_gl_out
->get_interface_type();
6169 _mesa_glsl_error(&loc
, state
,
6170 "redeclaration of gl_PerVertex output not "
6171 "allowed in the %s shader",
6172 _mesa_shader_stage_to_string(state
->stage
));
6174 if (state
->stage
== MESA_SHADER_TESS_CTRL
) {
6175 if (this->instance_name
== NULL
||
6176 strcmp(this->instance_name
, "gl_out") != 0 || this->array_specifier
== NULL
) {
6177 _mesa_glsl_error(&loc
, state
,
6178 "gl_PerVertex output must be redeclared as "
6182 if (this->instance_name
!= NULL
) {
6183 _mesa_glsl_error(&loc
, state
,
6184 "gl_PerVertex output may not be redeclared with "
6185 "an instance name");
6190 _mesa_glsl_error(&loc
, state
,
6191 "gl_PerVertex must be declared as an input or an "
6196 if (earlier_per_vertex
== NULL
) {
6197 /* An error has already been reported. Bail out to avoid null
6198 * dereferences later in this function.
6203 /* Copy locations from the old gl_PerVertex interface block. */
6204 for (unsigned i
= 0; i
< num_variables
; i
++) {
6205 int j
= earlier_per_vertex
->field_index(fields
[i
].name
);
6207 _mesa_glsl_error(&loc
, state
,
6208 "redeclaration of gl_PerVertex must be a subset "
6209 "of the built-in members of gl_PerVertex");
6211 fields
[i
].location
=
6212 earlier_per_vertex
->fields
.structure
[j
].location
;
6213 fields
[i
].interpolation
=
6214 earlier_per_vertex
->fields
.structure
[j
].interpolation
;
6215 fields
[i
].centroid
=
6216 earlier_per_vertex
->fields
.structure
[j
].centroid
;
6218 earlier_per_vertex
->fields
.structure
[j
].sample
;
6220 earlier_per_vertex
->fields
.structure
[j
].patch
;
6224 /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10
6227 * If a built-in interface block is redeclared, it must appear in
6228 * the shader before any use of any member included in the built-in
6229 * declaration, or a compilation error will result.
6231 * This appears to be a clarification to the behaviour established for
6232 * gl_PerVertex by GLSL 1.50, therefore we implement this behaviour
6233 * regardless of GLSL version.
6235 interface_block_usage_visitor
v(var_mode
, earlier_per_vertex
);
6236 v
.run(instructions
);
6237 if (v
.usage_found()) {
6238 _mesa_glsl_error(&loc
, state
,
6239 "redeclaration of a built-in interface block must "
6240 "appear before any use of any member of the "
6245 const glsl_type
*block_type
=
6246 glsl_type::get_interface_instance(fields
,
6250 if (this->layout
.flags
.q
.explicit_binding
)
6251 validate_binding_qualifier(state
, &loc
, block_type
, &this->layout
);
6253 if (!state
->symbols
->add_interface(block_type
->name
, block_type
, var_mode
)) {
6254 YYLTYPE loc
= this->get_location();
6255 _mesa_glsl_error(&loc
, state
, "interface block `%s' with type `%s' "
6256 "already taken in the current scope",
6257 this->block_name
, iface_type_name
);
6260 /* Since interface blocks cannot contain statements, it should be
6261 * impossible for the block to generate any instructions.
6263 assert(declared_variables
.is_empty());
6265 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
6267 * Geometry shader input variables get the per-vertex values written
6268 * out by vertex shader output variables of the same names. Since a
6269 * geometry shader operates on a set of vertices, each input varying
6270 * variable (or input block, see interface blocks below) needs to be
6271 * declared as an array.
6273 if (state
->stage
== MESA_SHADER_GEOMETRY
&& this->array_specifier
== NULL
&&
6274 var_mode
== ir_var_shader_in
) {
6275 _mesa_glsl_error(&loc
, state
, "geometry shader inputs must be arrays");
6276 } else if ((state
->stage
== MESA_SHADER_TESS_CTRL
||
6277 state
->stage
== MESA_SHADER_TESS_EVAL
) &&
6278 this->array_specifier
== NULL
&&
6279 var_mode
== ir_var_shader_in
) {
6280 _mesa_glsl_error(&loc
, state
, "per-vertex tessellation shader inputs must be arrays");
6281 } else if (state
->stage
== MESA_SHADER_TESS_CTRL
&&
6282 this->array_specifier
== NULL
&&
6283 var_mode
== ir_var_shader_out
) {
6284 _mesa_glsl_error(&loc
, state
, "tessellation control shader outputs must be arrays");
6288 /* Page 39 (page 45 of the PDF) of section 4.3.7 in the GLSL ES 3.00 spec
6291 * "If an instance name (instance-name) is used, then it puts all the
6292 * members inside a scope within its own name space, accessed with the
6293 * field selector ( . ) operator (analogously to structures)."
6295 if (this->instance_name
) {
6296 if (redeclaring_per_vertex
) {
6297 /* When a built-in in an unnamed interface block is redeclared,
6298 * get_variable_being_redeclared() calls
6299 * check_builtin_array_max_size() to make sure that built-in array
6300 * variables aren't redeclared to illegal sizes. But we're looking
6301 * at a redeclaration of a named built-in interface block. So we
6302 * have to manually call check_builtin_array_max_size() for all parts
6303 * of the interface that are arrays.
6305 for (unsigned i
= 0; i
< num_variables
; i
++) {
6306 if (fields
[i
].type
->is_array()) {
6307 const unsigned size
= fields
[i
].type
->array_size();
6308 check_builtin_array_max_size(fields
[i
].name
, size
, loc
, state
);
6312 validate_identifier(this->instance_name
, loc
, state
);
6317 if (this->array_specifier
!= NULL
) {
6318 /* Section 4.3.7 (Interface Blocks) of the GLSL 1.50 spec says:
6320 * For uniform blocks declared an array, each individual array
6321 * element corresponds to a separate buffer object backing one
6322 * instance of the block. As the array size indicates the number
6323 * of buffer objects needed, uniform block array declarations
6324 * must specify an array size.
6326 * And a few paragraphs later:
6328 * Geometry shader input blocks must be declared as arrays and
6329 * follow the array declaration and linking rules for all
6330 * geometry shader inputs. All other input and output block
6331 * arrays must specify an array size.
6333 * The same applies to tessellation shaders.
6335 * The upshot of this is that the only circumstance where an
6336 * interface array size *doesn't* need to be specified is on a
6337 * geometry shader input, tessellation control shader input,
6338 * tessellation control shader output, and tessellation evaluation
6341 if (this->array_specifier
->is_unsized_array
) {
6342 bool allow_inputs
= state
->stage
== MESA_SHADER_GEOMETRY
||
6343 state
->stage
== MESA_SHADER_TESS_CTRL
||
6344 state
->stage
== MESA_SHADER_TESS_EVAL
;
6345 bool allow_outputs
= state
->stage
== MESA_SHADER_TESS_CTRL
;
6347 if (this->layout
.flags
.q
.in
) {
6349 _mesa_glsl_error(&loc
, state
,
6350 "unsized input block arrays not allowed in "
6352 _mesa_shader_stage_to_string(state
->stage
));
6353 } else if (this->layout
.flags
.q
.out
) {
6355 _mesa_glsl_error(&loc
, state
,
6356 "unsized output block arrays not allowed in "
6358 _mesa_shader_stage_to_string(state
->stage
));
6360 /* by elimination, this is a uniform block array */
6361 _mesa_glsl_error(&loc
, state
,
6362 "unsized uniform block arrays not allowed in "
6364 _mesa_shader_stage_to_string(state
->stage
));
6368 const glsl_type
*block_array_type
=
6369 process_array_type(&loc
, block_type
, this->array_specifier
, state
);
6371 /* From section 4.3.9 (Interface Blocks) of the GLSL ES 3.10 spec:
6373 * * Arrays of arrays of blocks are not allowed
6375 if (state
->es_shader
&& block_array_type
->is_array() &&
6376 block_array_type
->fields
.array
->is_array()) {
6377 _mesa_glsl_error(&loc
, state
,
6378 "arrays of arrays interface blocks are "
6382 if (this->layout
.flags
.q
.explicit_binding
)
6383 validate_binding_qualifier(state
, &loc
, block_array_type
,
6386 var
= new(state
) ir_variable(block_array_type
,
6387 this->instance_name
,
6390 var
= new(state
) ir_variable(block_type
,
6391 this->instance_name
,
6395 var
->data
.matrix_layout
= matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
6396 ? GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
: matrix_layout
;
6398 if (var_mode
== ir_var_shader_in
|| var_mode
== ir_var_uniform
)
6399 var
->data
.read_only
= true;
6401 if (state
->stage
== MESA_SHADER_GEOMETRY
&& var_mode
== ir_var_shader_in
)
6402 handle_geometry_shader_input_decl(state
, loc
, var
);
6403 else if ((state
->stage
== MESA_SHADER_TESS_CTRL
||
6404 state
->stage
== MESA_SHADER_TESS_EVAL
) && var_mode
== ir_var_shader_in
)
6405 handle_tess_shader_input_decl(state
, loc
, var
);
6406 else if (state
->stage
== MESA_SHADER_TESS_CTRL
&& var_mode
== ir_var_shader_out
)
6407 handle_tess_ctrl_shader_output_decl(state
, loc
, var
);
6409 for (unsigned i
= 0; i
< num_variables
; i
++) {
6410 if (fields
[i
].type
->is_unsized_array()) {
6411 if (var_mode
== ir_var_shader_storage
) {
6412 if (i
!= (num_variables
- 1)) {
6413 _mesa_glsl_error(&loc
, state
, "unsized array `%s' definition: "
6414 "only last member of a shader storage block "
6415 "can be defined as unsized array",
6419 /* From GLSL ES 3.10 spec, section 4.1.9 "Arrays":
6421 * "If an array is declared as the last member of a shader storage
6422 * block and the size is not specified at compile-time, it is
6423 * sized at run-time. In all other cases, arrays are sized only
6426 if (state
->es_shader
) {
6427 _mesa_glsl_error(&loc
, state
, "unsized array `%s' definition: "
6428 "only last member of a shader storage block "
6429 "can be defined as unsized array",
6436 if (ir_variable
*earlier
=
6437 state
->symbols
->get_variable(this->instance_name
)) {
6438 if (!redeclaring_per_vertex
) {
6439 _mesa_glsl_error(&loc
, state
, "`%s' redeclared",
6440 this->instance_name
);
6442 earlier
->data
.how_declared
= ir_var_declared_normally
;
6443 earlier
->type
= var
->type
;
6444 earlier
->reinit_interface_type(block_type
);
6447 /* Propagate the "binding" keyword into this UBO's fields;
6448 * the UBO declaration itself doesn't get an ir_variable unless it
6449 * has an instance name. This is ugly.
6451 var
->data
.explicit_binding
= this->layout
.flags
.q
.explicit_binding
;
6452 var
->data
.binding
= this->layout
.binding
;
6454 state
->symbols
->add_variable(var
);
6455 instructions
->push_tail(var
);
6458 /* In order to have an array size, the block must also be declared with
6461 assert(this->array_specifier
== NULL
);
6463 for (unsigned i
= 0; i
< num_variables
; i
++) {
6465 new(state
) ir_variable(fields
[i
].type
,
6466 ralloc_strdup(state
, fields
[i
].name
),
6468 var
->data
.interpolation
= fields
[i
].interpolation
;
6469 var
->data
.centroid
= fields
[i
].centroid
;
6470 var
->data
.sample
= fields
[i
].sample
;
6471 var
->data
.patch
= fields
[i
].patch
;
6472 var
->init_interface_type(block_type
);
6474 if (var_mode
== ir_var_shader_in
|| var_mode
== ir_var_uniform
)
6475 var
->data
.read_only
= true;
6477 if (fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
) {
6478 var
->data
.matrix_layout
= matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
6479 ? GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
: matrix_layout
;
6481 var
->data
.matrix_layout
= fields
[i
].matrix_layout
;
6484 if (fields
[i
].stream
!= -1 &&
6485 ((unsigned)fields
[i
].stream
) != this->layout
.stream
) {
6486 _mesa_glsl_error(&loc
, state
,
6487 "stream layout qualifier on "
6488 "interface block member `%s' does not match "
6489 "the interface block (%d vs %d)",
6490 var
->name
, fields
[i
].stream
, this->layout
.stream
);
6493 var
->data
.stream
= this->layout
.stream
;
6495 if (var
->data
.mode
== ir_var_shader_storage
) {
6496 var
->data
.image_read_only
= fields
[i
].image_read_only
;
6497 var
->data
.image_write_only
= fields
[i
].image_write_only
;
6498 var
->data
.image_coherent
= fields
[i
].image_coherent
;
6499 var
->data
.image_volatile
= fields
[i
].image_volatile
;
6500 var
->data
.image_restrict
= fields
[i
].image_restrict
;
6503 /* Examine var name here since var may get deleted in the next call */
6504 bool var_is_gl_id
= is_gl_identifier(var
->name
);
6506 if (redeclaring_per_vertex
) {
6507 ir_variable
*earlier
=
6508 get_variable_being_redeclared(var
, loc
, state
,
6509 true /* allow_all_redeclarations */);
6510 if (!var_is_gl_id
|| earlier
== NULL
) {
6511 _mesa_glsl_error(&loc
, state
,
6512 "redeclaration of gl_PerVertex can only "
6513 "include built-in variables");
6514 } else if (earlier
->data
.how_declared
== ir_var_declared_normally
) {
6515 _mesa_glsl_error(&loc
, state
,
6516 "`%s' has already been redeclared",
6519 earlier
->data
.how_declared
= ir_var_declared_in_block
;
6520 earlier
->reinit_interface_type(block_type
);
6525 if (state
->symbols
->get_variable(var
->name
) != NULL
)
6526 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", var
->name
);
6528 /* Propagate the "binding" keyword into this UBO/SSBO's fields.
6529 * The UBO declaration itself doesn't get an ir_variable unless it
6530 * has an instance name. This is ugly.
6532 var
->data
.explicit_binding
= this->layout
.flags
.q
.explicit_binding
;
6533 var
->data
.binding
= this->layout
.binding
;
6535 if (var
->type
->is_unsized_array()) {
6536 if (var
->is_in_shader_storage_block()) {
6537 if (!is_unsized_array_last_element(var
)) {
6538 _mesa_glsl_error(&loc
, state
, "unsized array `%s' definition: "
6539 "only last member of a shader storage block "
6540 "can be defined as unsized array",
6543 var
->data
.from_ssbo_unsized_array
= true;
6545 /* From GLSL ES 3.10 spec, section 4.1.9 "Arrays":
6547 * "If an array is declared as the last member of a shader storage
6548 * block and the size is not specified at compile-time, it is
6549 * sized at run-time. In all other cases, arrays are sized only
6552 if (state
->es_shader
) {
6553 _mesa_glsl_error(&loc
, state
, "unsized array `%s' definition: "
6554 "only last member of a shader storage block "
6555 "can be defined as unsized array",
6561 state
->symbols
->add_variable(var
);
6562 instructions
->push_tail(var
);
6565 if (redeclaring_per_vertex
&& block_type
!= earlier_per_vertex
) {
6566 /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10 spec:
6568 * It is also a compilation error ... to redeclare a built-in
6569 * block and then use a member from that built-in block that was
6570 * not included in the redeclaration.
6572 * This appears to be a clarification to the behaviour established
6573 * for gl_PerVertex by GLSL 1.50, therefore we implement this
6574 * behaviour regardless of GLSL version.
6576 * To prevent the shader from using a member that was not included in
6577 * the redeclaration, we disable any ir_variables that are still
6578 * associated with the old declaration of gl_PerVertex (since we've
6579 * already updated all of the variables contained in the new
6580 * gl_PerVertex to point to it).
6582 * As a side effect this will prevent
6583 * validate_intrastage_interface_blocks() from getting confused and
6584 * thinking there are conflicting definitions of gl_PerVertex in the
6587 foreach_in_list_safe(ir_instruction
, node
, instructions
) {
6588 ir_variable
*const var
= node
->as_variable();
6590 var
->get_interface_type() == earlier_per_vertex
&&
6591 var
->data
.mode
== var_mode
) {
6592 if (var
->data
.how_declared
== ir_var_declared_normally
) {
6593 _mesa_glsl_error(&loc
, state
,
6594 "redeclaration of gl_PerVertex cannot "
6595 "follow a redeclaration of `%s'",
6598 state
->symbols
->disable_variable(var
->name
);
6610 ast_tcs_output_layout::hir(exec_list
*instructions
,
6611 struct _mesa_glsl_parse_state
*state
)
6613 YYLTYPE loc
= this->get_location();
6615 /* If any tessellation control output layout declaration preceded this
6616 * one, make sure it was consistent with this one.
6618 if (state
->tcs_output_vertices_specified
&&
6619 state
->out_qualifier
->vertices
!= this->vertices
) {
6620 _mesa_glsl_error(&loc
, state
,
6621 "tessellation control shader output layout does not "
6622 "match previous declaration");
6626 /* If any shader outputs occurred before this declaration and specified an
6627 * array size, make sure the size they specified is consistent with the
6630 unsigned num_vertices
= this->vertices
;
6631 if (state
->tcs_output_size
!= 0 && state
->tcs_output_size
!= num_vertices
) {
6632 _mesa_glsl_error(&loc
, state
,
6633 "this tessellation control shader output layout "
6634 "specifies %u vertices, but a previous output "
6635 "is declared with size %u",
6636 num_vertices
, state
->tcs_output_size
);
6640 state
->tcs_output_vertices_specified
= true;
6642 /* If any shader outputs occurred before this declaration and did not
6643 * specify an array size, their size is determined now.
6645 foreach_in_list (ir_instruction
, node
, instructions
) {
6646 ir_variable
*var
= node
->as_variable();
6647 if (var
== NULL
|| var
->data
.mode
!= ir_var_shader_out
)
6650 /* Note: Not all tessellation control shader output are arrays. */
6651 if (!var
->type
->is_unsized_array() || var
->data
.patch
)
6654 if (var
->data
.max_array_access
>= num_vertices
) {
6655 _mesa_glsl_error(&loc
, state
,
6656 "this tessellation control shader output layout "
6657 "specifies %u vertices, but an access to element "
6658 "%u of output `%s' already exists", num_vertices
,
6659 var
->data
.max_array_access
, var
->name
);
6661 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
6671 ast_gs_input_layout::hir(exec_list
*instructions
,
6672 struct _mesa_glsl_parse_state
*state
)
6674 YYLTYPE loc
= this->get_location();
6676 /* If any geometry input layout declaration preceded this one, make sure it
6677 * was consistent with this one.
6679 if (state
->gs_input_prim_type_specified
&&
6680 state
->in_qualifier
->prim_type
!= this->prim_type
) {
6681 _mesa_glsl_error(&loc
, state
,
6682 "geometry shader input layout does not match"
6683 " previous declaration");
6687 /* If any shader inputs occurred before this declaration and specified an
6688 * array size, make sure the size they specified is consistent with the
6691 unsigned num_vertices
= vertices_per_prim(this->prim_type
);
6692 if (state
->gs_input_size
!= 0 && state
->gs_input_size
!= num_vertices
) {
6693 _mesa_glsl_error(&loc
, state
,
6694 "this geometry shader input layout implies %u vertices"
6695 " per primitive, but a previous input is declared"
6696 " with size %u", num_vertices
, state
->gs_input_size
);
6700 state
->gs_input_prim_type_specified
= true;
6702 /* If any shader inputs occurred before this declaration and did not
6703 * specify an array size, their size is determined now.
6705 foreach_in_list(ir_instruction
, node
, instructions
) {
6706 ir_variable
*var
= node
->as_variable();
6707 if (var
== NULL
|| var
->data
.mode
!= ir_var_shader_in
)
6710 /* Note: gl_PrimitiveIDIn has mode ir_var_shader_in, but it's not an
6714 if (var
->type
->is_unsized_array()) {
6715 if (var
->data
.max_array_access
>= num_vertices
) {
6716 _mesa_glsl_error(&loc
, state
,
6717 "this geometry shader input layout implies %u"
6718 " vertices, but an access to element %u of input"
6719 " `%s' already exists", num_vertices
,
6720 var
->data
.max_array_access
, var
->name
);
6722 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
6733 ast_cs_input_layout::hir(exec_list
*instructions
,
6734 struct _mesa_glsl_parse_state
*state
)
6736 YYLTYPE loc
= this->get_location();
6738 /* If any compute input layout declaration preceded this one, make sure it
6739 * was consistent with this one.
6741 if (state
->cs_input_local_size_specified
) {
6742 for (int i
= 0; i
< 3; i
++) {
6743 if (state
->cs_input_local_size
[i
] != this->local_size
[i
]) {
6744 _mesa_glsl_error(&loc
, state
,
6745 "compute shader input layout does not match"
6746 " previous declaration");
6752 /* From the ARB_compute_shader specification:
6754 * If the local size of the shader in any dimension is greater
6755 * than the maximum size supported by the implementation for that
6756 * dimension, a compile-time error results.
6758 * It is not clear from the spec how the error should be reported if
6759 * the total size of the work group exceeds
6760 * MAX_COMPUTE_WORK_GROUP_INVOCATIONS, but it seems reasonable to
6761 * report it at compile time as well.
6763 GLuint64 total_invocations
= 1;
6764 for (int i
= 0; i
< 3; i
++) {
6765 if (this->local_size
[i
] > state
->ctx
->Const
.MaxComputeWorkGroupSize
[i
]) {
6766 _mesa_glsl_error(&loc
, state
,
6767 "local_size_%c exceeds MAX_COMPUTE_WORK_GROUP_SIZE"
6769 state
->ctx
->Const
.MaxComputeWorkGroupSize
[i
]);
6772 total_invocations
*= this->local_size
[i
];
6773 if (total_invocations
>
6774 state
->ctx
->Const
.MaxComputeWorkGroupInvocations
) {
6775 _mesa_glsl_error(&loc
, state
,
6776 "product of local_sizes exceeds "
6777 "MAX_COMPUTE_WORK_GROUP_INVOCATIONS (%d)",
6778 state
->ctx
->Const
.MaxComputeWorkGroupInvocations
);
6783 state
->cs_input_local_size_specified
= true;
6784 for (int i
= 0; i
< 3; i
++)
6785 state
->cs_input_local_size
[i
] = this->local_size
[i
];
6787 /* We may now declare the built-in constant gl_WorkGroupSize (see
6788 * builtin_variable_generator::generate_constants() for why we didn't
6789 * declare it earlier).
6791 ir_variable
*var
= new(state
->symbols
)
6792 ir_variable(glsl_type::uvec3_type
, "gl_WorkGroupSize", ir_var_auto
);
6793 var
->data
.how_declared
= ir_var_declared_implicitly
;
6794 var
->data
.read_only
= true;
6795 instructions
->push_tail(var
);
6796 state
->symbols
->add_variable(var
);
6797 ir_constant_data data
;
6798 memset(&data
, 0, sizeof(data
));
6799 for (int i
= 0; i
< 3; i
++)
6800 data
.u
[i
] = this->local_size
[i
];
6801 var
->constant_value
= new(var
) ir_constant(glsl_type::uvec3_type
, &data
);
6802 var
->constant_initializer
=
6803 new(var
) ir_constant(glsl_type::uvec3_type
, &data
);
6804 var
->data
.has_initializer
= true;
6811 detect_conflicting_assignments(struct _mesa_glsl_parse_state
*state
,
6812 exec_list
*instructions
)
6814 bool gl_FragColor_assigned
= false;
6815 bool gl_FragData_assigned
= false;
6816 bool user_defined_fs_output_assigned
= false;
6817 ir_variable
*user_defined_fs_output
= NULL
;
6819 /* It would be nice to have proper location information. */
6821 memset(&loc
, 0, sizeof(loc
));
6823 foreach_in_list(ir_instruction
, node
, instructions
) {
6824 ir_variable
*var
= node
->as_variable();
6826 if (!var
|| !var
->data
.assigned
)
6829 if (strcmp(var
->name
, "gl_FragColor") == 0)
6830 gl_FragColor_assigned
= true;
6831 else if (strcmp(var
->name
, "gl_FragData") == 0)
6832 gl_FragData_assigned
= true;
6833 else if (!is_gl_identifier(var
->name
)) {
6834 if (state
->stage
== MESA_SHADER_FRAGMENT
&&
6835 var
->data
.mode
== ir_var_shader_out
) {
6836 user_defined_fs_output_assigned
= true;
6837 user_defined_fs_output
= var
;
6842 /* From the GLSL 1.30 spec:
6844 * "If a shader statically assigns a value to gl_FragColor, it
6845 * may not assign a value to any element of gl_FragData. If a
6846 * shader statically writes a value to any element of
6847 * gl_FragData, it may not assign a value to
6848 * gl_FragColor. That is, a shader may assign values to either
6849 * gl_FragColor or gl_FragData, but not both. Multiple shaders
6850 * linked together must also consistently write just one of
6851 * these variables. Similarly, if user declared output
6852 * variables are in use (statically assigned to), then the
6853 * built-in variables gl_FragColor and gl_FragData may not be
6854 * assigned to. These incorrect usages all generate compile
6857 if (gl_FragColor_assigned
&& gl_FragData_assigned
) {
6858 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
6859 "`gl_FragColor' and `gl_FragData'");
6860 } else if (gl_FragColor_assigned
&& user_defined_fs_output_assigned
) {
6861 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
6862 "`gl_FragColor' and `%s'",
6863 user_defined_fs_output
->name
);
6864 } else if (gl_FragData_assigned
&& user_defined_fs_output_assigned
) {
6865 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
6866 "`gl_FragData' and `%s'",
6867 user_defined_fs_output
->name
);
6873 remove_per_vertex_blocks(exec_list
*instructions
,
6874 _mesa_glsl_parse_state
*state
, ir_variable_mode mode
)
6876 /* Find the gl_PerVertex interface block of the appropriate (in/out) mode,
6877 * if it exists in this shader type.
6879 const glsl_type
*per_vertex
= NULL
;
6881 case ir_var_shader_in
:
6882 if (ir_variable
*gl_in
= state
->symbols
->get_variable("gl_in"))
6883 per_vertex
= gl_in
->get_interface_type();
6885 case ir_var_shader_out
:
6886 if (ir_variable
*gl_Position
=
6887 state
->symbols
->get_variable("gl_Position")) {
6888 per_vertex
= gl_Position
->get_interface_type();
6892 assert(!"Unexpected mode");
6896 /* If we didn't find a built-in gl_PerVertex interface block, then we don't
6897 * need to do anything.
6899 if (per_vertex
== NULL
)
6902 /* If the interface block is used by the shader, then we don't need to do
6905 interface_block_usage_visitor
v(mode
, per_vertex
);
6906 v
.run(instructions
);
6907 if (v
.usage_found())
6910 /* Remove any ir_variable declarations that refer to the interface block
6913 foreach_in_list_safe(ir_instruction
, node
, instructions
) {
6914 ir_variable
*const var
= node
->as_variable();
6915 if (var
!= NULL
&& var
->get_interface_type() == per_vertex
&&
6916 var
->data
.mode
== mode
) {
6917 state
->symbols
->disable_variable(var
->name
);