2 * Copyright © 2010 Intel Corporation
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
21 * DEALINGS IN THE SOFTWARE.
26 * Convert abstract syntax to to high-level intermediate reprensentation (HIR).
28 * During the conversion to HIR, the majority of the symantic checking is
29 * preformed on the program. This includes:
31 * * Symbol table management
35 * The majority of this work could be done during parsing, and the parser could
36 * probably generate HIR directly. However, this results in frequent changes
37 * to the parser code. Since we do not assume that every system this complier
38 * is built on will have Flex and Bison installed, we have to store the code
39 * generated by these tools in our version control system. In other parts of
40 * the system we've seen problems where a parser was changed but the generated
41 * code was not committed, merge conflicts where created because two developers
42 * had slightly different versions of Bison installed, etc.
44 * I have also noticed that running Bison generated parsers in GDB is very
45 * irritating. When you get a segfault on '$$ = $1->foo', you can't very
46 * well 'print $1' in GDB.
48 * As a result, my preference is to put as little C code as possible in the
49 * parser (and lexer) sources.
52 #include "main/core.h" /* for struct gl_extensions */
53 #include "glsl_symbol_table.h"
54 #include "glsl_parser_extras.h"
56 #include "glsl_types.h"
57 #include "program/hash_table.h"
61 detect_conflicting_assignments(struct _mesa_glsl_parse_state
*state
,
62 exec_list
*instructions
);
64 remove_per_vertex_blocks(exec_list
*instructions
,
65 _mesa_glsl_parse_state
*state
, ir_variable_mode mode
);
69 _mesa_ast_to_hir(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
)
71 _mesa_glsl_initialize_variables(instructions
, state
);
73 state
->symbols
->separate_function_namespace
= state
->language_version
== 110;
75 state
->current_function
= NULL
;
77 state
->toplevel_ir
= instructions
;
79 state
->gs_input_prim_type_specified
= false;
81 /* Section 4.2 of the GLSL 1.20 specification states:
82 * "The built-in functions are scoped in a scope outside the global scope
83 * users declare global variables in. That is, a shader's global scope,
84 * available for user-defined functions and global variables, is nested
85 * inside the scope containing the built-in functions."
87 * Since built-in functions like ftransform() access built-in variables,
88 * it follows that those must be in the outer scope as well.
90 * We push scope here to create this nesting effect...but don't pop.
91 * This way, a shader's globals are still in the symbol table for use
94 state
->symbols
->push_scope();
96 foreach_list_typed (ast_node
, ast
, link
, & state
->translation_unit
)
97 ast
->hir(instructions
, state
);
99 detect_recursion_unlinked(state
, instructions
);
100 detect_conflicting_assignments(state
, instructions
);
102 state
->toplevel_ir
= NULL
;
104 /* Move all of the variable declarations to the front of the IR list, and
105 * reverse the order. This has the (intended!) side effect that vertex
106 * shader inputs and fragment shader outputs will appear in the IR in the
107 * same order that they appeared in the shader code. This results in the
108 * locations being assigned in the declared order. Many (arguably buggy)
109 * applications depend on this behavior, and it matches what nearly all
112 foreach_list_safe(node
, instructions
) {
113 ir_variable
*const var
= ((ir_instruction
*) node
)->as_variable();
119 instructions
->push_head(var
);
122 /* From section 7.1 (Built-In Language Variables) of the GLSL 4.10 spec:
124 * If multiple shaders using members of a built-in block belonging to
125 * the same interface are linked together in the same program, they
126 * must all redeclare the built-in block in the same way, as described
127 * in section 4.3.7 "Interface Blocks" for interface block matching, or
128 * a link error will result.
130 * The phrase "using members of a built-in block" implies that if two
131 * shaders are linked together and one of them *does not use* any members
132 * of the built-in block, then that shader does not need to have a matching
133 * redeclaration of the built-in block.
135 * This appears to be a clarification to the behaviour established for
136 * gl_PerVertex by GLSL 1.50, therefore implement it regardless of GLSL
139 * The definition of "interface" in section 4.3.7 that applies here is as
142 * The boundary between adjacent programmable pipeline stages: This
143 * spans all the outputs in all compilation units of the first stage
144 * and all the inputs in all compilation units of the second stage.
146 * Therefore this rule applies to both inter- and intra-stage linking.
148 * The easiest way to implement this is to check whether the shader uses
149 * gl_PerVertex right after ast-to-ir conversion, and if it doesn't, simply
150 * remove all the relevant variable declaration from the IR, so that the
151 * linker won't see them and complain about mismatches.
153 remove_per_vertex_blocks(instructions
, state
, ir_var_shader_in
);
154 remove_per_vertex_blocks(instructions
, state
, ir_var_shader_out
);
159 * If a conversion is available, convert one operand to a different type
161 * The \c from \c ir_rvalue is converted "in place".
163 * \param to Type that the operand it to be converted to
164 * \param from Operand that is being converted
165 * \param state GLSL compiler state
168 * If a conversion is possible (or unnecessary), \c true is returned.
169 * Otherwise \c false is returned.
172 apply_implicit_conversion(const glsl_type
*to
, ir_rvalue
* &from
,
173 struct _mesa_glsl_parse_state
*state
)
176 if (to
->base_type
== from
->type
->base_type
)
179 /* This conversion was added in GLSL 1.20. If the compilation mode is
180 * GLSL 1.10, the conversion is skipped.
182 if (!state
->is_version(120, 0))
185 /* From page 27 (page 33 of the PDF) of the GLSL 1.50 spec:
187 * "There are no implicit array or structure conversions. For
188 * example, an array of int cannot be implicitly converted to an
189 * array of float. There are no implicit conversions between
190 * signed and unsigned integers."
192 /* FINISHME: The above comment is partially a lie. There is int/uint
193 * FINISHME: conversion for immediate constants.
195 if (!to
->is_float() || !from
->type
->is_numeric())
198 /* Convert to a floating point type with the same number of components
199 * as the original type - i.e. int to float, not int to vec4.
201 to
= glsl_type::get_instance(GLSL_TYPE_FLOAT
, from
->type
->vector_elements
,
202 from
->type
->matrix_columns
);
204 switch (from
->type
->base_type
) {
206 from
= new(ctx
) ir_expression(ir_unop_i2f
, to
, from
, NULL
);
209 from
= new(ctx
) ir_expression(ir_unop_u2f
, to
, from
, NULL
);
212 from
= new(ctx
) ir_expression(ir_unop_b2f
, to
, from
, NULL
);
222 static const struct glsl_type
*
223 arithmetic_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
225 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
227 const glsl_type
*type_a
= value_a
->type
;
228 const glsl_type
*type_b
= value_b
->type
;
230 /* From GLSL 1.50 spec, page 56:
232 * "The arithmetic binary operators add (+), subtract (-),
233 * multiply (*), and divide (/) operate on integer and
234 * floating-point scalars, vectors, and matrices."
236 if (!type_a
->is_numeric() || !type_b
->is_numeric()) {
237 _mesa_glsl_error(loc
, state
,
238 "operands to arithmetic operators must be numeric");
239 return glsl_type::error_type
;
243 /* "If one operand is floating-point based and the other is
244 * not, then the conversions from Section 4.1.10 "Implicit
245 * Conversions" are applied to the non-floating-point-based operand."
247 if (!apply_implicit_conversion(type_a
, value_b
, state
)
248 && !apply_implicit_conversion(type_b
, value_a
, state
)) {
249 _mesa_glsl_error(loc
, state
,
250 "could not implicitly convert operands to "
251 "arithmetic operator");
252 return glsl_type::error_type
;
254 type_a
= value_a
->type
;
255 type_b
= value_b
->type
;
257 /* "If the operands are integer types, they must both be signed or
260 * From this rule and the preceeding conversion it can be inferred that
261 * both types must be GLSL_TYPE_FLOAT, or GLSL_TYPE_UINT, or GLSL_TYPE_INT.
262 * The is_numeric check above already filtered out the case where either
263 * type is not one of these, so now the base types need only be tested for
266 if (type_a
->base_type
!= type_b
->base_type
) {
267 _mesa_glsl_error(loc
, state
,
268 "base type mismatch for arithmetic operator");
269 return glsl_type::error_type
;
272 /* "All arithmetic binary operators result in the same fundamental type
273 * (signed integer, unsigned integer, or floating-point) as the
274 * operands they operate on, after operand type conversion. After
275 * conversion, the following cases are valid
277 * * The two operands are scalars. In this case the operation is
278 * applied, resulting in a scalar."
280 if (type_a
->is_scalar() && type_b
->is_scalar())
283 /* "* One operand is a scalar, and the other is a vector or matrix.
284 * In this case, the scalar operation is applied independently to each
285 * component of the vector or matrix, resulting in the same size
288 if (type_a
->is_scalar()) {
289 if (!type_b
->is_scalar())
291 } else if (type_b
->is_scalar()) {
295 /* All of the combinations of <scalar, scalar>, <vector, scalar>,
296 * <scalar, vector>, <scalar, matrix>, and <matrix, scalar> have been
299 assert(!type_a
->is_scalar());
300 assert(!type_b
->is_scalar());
302 /* "* The two operands are vectors of the same size. In this case, the
303 * operation is done component-wise resulting in the same size
306 if (type_a
->is_vector() && type_b
->is_vector()) {
307 if (type_a
== type_b
) {
310 _mesa_glsl_error(loc
, state
,
311 "vector size mismatch for arithmetic operator");
312 return glsl_type::error_type
;
316 /* All of the combinations of <scalar, scalar>, <vector, scalar>,
317 * <scalar, vector>, <scalar, matrix>, <matrix, scalar>, and
318 * <vector, vector> have been handled. At least one of the operands must
319 * be matrix. Further, since there are no integer matrix types, the base
320 * type of both operands must be float.
322 assert(type_a
->is_matrix() || type_b
->is_matrix());
323 assert(type_a
->base_type
== GLSL_TYPE_FLOAT
);
324 assert(type_b
->base_type
== GLSL_TYPE_FLOAT
);
326 /* "* The operator is add (+), subtract (-), or divide (/), and the
327 * operands are matrices with the same number of rows and the same
328 * number of columns. In this case, the operation is done component-
329 * wise resulting in the same size matrix."
330 * * The operator is multiply (*), where both operands are matrices or
331 * one operand is a vector and the other a matrix. A right vector
332 * operand is treated as a column vector and a left vector operand as a
333 * row vector. In all these cases, it is required that the number of
334 * columns of the left operand is equal to the number of rows of the
335 * right operand. Then, the multiply (*) operation does a linear
336 * algebraic multiply, yielding an object that has the same number of
337 * rows as the left operand and the same number of columns as the right
338 * operand. Section 5.10 "Vector and Matrix Operations" explains in
339 * more detail how vectors and matrices are operated on."
342 if (type_a
== type_b
)
345 if (type_a
->is_matrix() && type_b
->is_matrix()) {
346 /* Matrix multiply. The columns of A must match the rows of B. Given
347 * the other previously tested constraints, this means the vector type
348 * of a row from A must be the same as the vector type of a column from
351 if (type_a
->row_type() == type_b
->column_type()) {
352 /* The resulting matrix has the number of columns of matrix B and
353 * the number of rows of matrix A. We get the row count of A by
354 * looking at the size of a vector that makes up a column. The
355 * transpose (size of a row) is done for B.
357 const glsl_type
*const type
=
358 glsl_type::get_instance(type_a
->base_type
,
359 type_a
->column_type()->vector_elements
,
360 type_b
->row_type()->vector_elements
);
361 assert(type
!= glsl_type::error_type
);
365 } else if (type_a
->is_matrix()) {
366 /* A is a matrix and B is a column vector. Columns of A must match
367 * rows of B. Given the other previously tested constraints, this
368 * means the vector type of a row from A must be the same as the
369 * vector the type of B.
371 if (type_a
->row_type() == type_b
) {
372 /* The resulting vector has a number of elements equal to
373 * the number of rows of matrix A. */
374 const glsl_type
*const type
=
375 glsl_type::get_instance(type_a
->base_type
,
376 type_a
->column_type()->vector_elements
,
378 assert(type
!= glsl_type::error_type
);
383 assert(type_b
->is_matrix());
385 /* A is a row vector and B is a matrix. Columns of A must match rows
386 * of B. Given the other previously tested constraints, this means
387 * the type of A must be the same as the vector type of a column from
390 if (type_a
== type_b
->column_type()) {
391 /* The resulting vector has a number of elements equal to
392 * the number of columns of matrix B. */
393 const glsl_type
*const type
=
394 glsl_type::get_instance(type_a
->base_type
,
395 type_b
->row_type()->vector_elements
,
397 assert(type
!= glsl_type::error_type
);
403 _mesa_glsl_error(loc
, state
, "size mismatch for matrix multiplication");
404 return glsl_type::error_type
;
408 /* "All other cases are illegal."
410 _mesa_glsl_error(loc
, state
, "type mismatch");
411 return glsl_type::error_type
;
415 static const struct glsl_type
*
416 unary_arithmetic_result_type(const struct glsl_type
*type
,
417 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
419 /* From GLSL 1.50 spec, page 57:
421 * "The arithmetic unary operators negate (-), post- and pre-increment
422 * and decrement (-- and ++) operate on integer or floating-point
423 * values (including vectors and matrices). All unary operators work
424 * component-wise on their operands. These result with the same type
427 if (!type
->is_numeric()) {
428 _mesa_glsl_error(loc
, state
,
429 "operands to arithmetic operators must be numeric");
430 return glsl_type::error_type
;
437 * \brief Return the result type of a bit-logic operation.
439 * If the given types to the bit-logic operator are invalid, return
440 * glsl_type::error_type.
442 * \param type_a Type of LHS of bit-logic op
443 * \param type_b Type of RHS of bit-logic op
445 static const struct glsl_type
*
446 bit_logic_result_type(const struct glsl_type
*type_a
,
447 const struct glsl_type
*type_b
,
449 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
451 if (!state
->check_bitwise_operations_allowed(loc
)) {
452 return glsl_type::error_type
;
455 /* From page 50 (page 56 of PDF) of GLSL 1.30 spec:
457 * "The bitwise operators and (&), exclusive-or (^), and inclusive-or
458 * (|). The operands must be of type signed or unsigned integers or
461 if (!type_a
->is_integer()) {
462 _mesa_glsl_error(loc
, state
, "LHS of `%s' must be an integer",
463 ast_expression::operator_string(op
));
464 return glsl_type::error_type
;
466 if (!type_b
->is_integer()) {
467 _mesa_glsl_error(loc
, state
, "RHS of `%s' must be an integer",
468 ast_expression::operator_string(op
));
469 return glsl_type::error_type
;
472 /* "The fundamental types of the operands (signed or unsigned) must
475 if (type_a
->base_type
!= type_b
->base_type
) {
476 _mesa_glsl_error(loc
, state
, "operands of `%s' must have the same "
477 "base type", ast_expression::operator_string(op
));
478 return glsl_type::error_type
;
481 /* "The operands cannot be vectors of differing size." */
482 if (type_a
->is_vector() &&
483 type_b
->is_vector() &&
484 type_a
->vector_elements
!= type_b
->vector_elements
) {
485 _mesa_glsl_error(loc
, state
, "operands of `%s' cannot be vectors of "
486 "different sizes", ast_expression::operator_string(op
));
487 return glsl_type::error_type
;
490 /* "If one operand is a scalar and the other a vector, the scalar is
491 * applied component-wise to the vector, resulting in the same type as
492 * the vector. The fundamental types of the operands [...] will be the
493 * resulting fundamental type."
495 if (type_a
->is_scalar())
501 static const struct glsl_type
*
502 modulus_result_type(const struct glsl_type
*type_a
,
503 const struct glsl_type
*type_b
,
504 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
506 if (!state
->check_version(130, 300, loc
, "operator '%%' is reserved")) {
507 return glsl_type::error_type
;
510 /* From GLSL 1.50 spec, page 56:
511 * "The operator modulus (%) operates on signed or unsigned integers or
512 * integer vectors. The operand types must both be signed or both be
515 if (!type_a
->is_integer()) {
516 _mesa_glsl_error(loc
, state
, "LHS of operator %% must be an integer");
517 return glsl_type::error_type
;
519 if (!type_b
->is_integer()) {
520 _mesa_glsl_error(loc
, state
, "RHS of operator %% must be an integer");
521 return glsl_type::error_type
;
523 if (type_a
->base_type
!= type_b
->base_type
) {
524 _mesa_glsl_error(loc
, state
,
525 "operands of %% must have the same base type");
526 return glsl_type::error_type
;
529 /* "The operands cannot be vectors of differing size. If one operand is
530 * a scalar and the other vector, then the scalar is applied component-
531 * wise to the vector, resulting in the same type as the vector. If both
532 * are vectors of the same size, the result is computed component-wise."
534 if (type_a
->is_vector()) {
535 if (!type_b
->is_vector()
536 || (type_a
->vector_elements
== type_b
->vector_elements
))
541 /* "The operator modulus (%) is not defined for any other data types
542 * (non-integer types)."
544 _mesa_glsl_error(loc
, state
, "type mismatch");
545 return glsl_type::error_type
;
549 static const struct glsl_type
*
550 relational_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
551 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
553 const glsl_type
*type_a
= value_a
->type
;
554 const glsl_type
*type_b
= value_b
->type
;
556 /* From GLSL 1.50 spec, page 56:
557 * "The relational operators greater than (>), less than (<), greater
558 * than or equal (>=), and less than or equal (<=) operate only on
559 * scalar integer and scalar floating-point expressions."
561 if (!type_a
->is_numeric()
562 || !type_b
->is_numeric()
563 || !type_a
->is_scalar()
564 || !type_b
->is_scalar()) {
565 _mesa_glsl_error(loc
, state
,
566 "operands to relational operators must be scalar and "
568 return glsl_type::error_type
;
571 /* "Either the operands' types must match, or the conversions from
572 * Section 4.1.10 "Implicit Conversions" will be applied to the integer
573 * operand, after which the types must match."
575 if (!apply_implicit_conversion(type_a
, value_b
, state
)
576 && !apply_implicit_conversion(type_b
, value_a
, state
)) {
577 _mesa_glsl_error(loc
, state
,
578 "could not implicitly convert operands to "
579 "relational operator");
580 return glsl_type::error_type
;
582 type_a
= value_a
->type
;
583 type_b
= value_b
->type
;
585 if (type_a
->base_type
!= type_b
->base_type
) {
586 _mesa_glsl_error(loc
, state
, "base type mismatch");
587 return glsl_type::error_type
;
590 /* "The result is scalar Boolean."
592 return glsl_type::bool_type
;
596 * \brief Return the result type of a bit-shift operation.
598 * If the given types to the bit-shift operator are invalid, return
599 * glsl_type::error_type.
601 * \param type_a Type of LHS of bit-shift op
602 * \param type_b Type of RHS of bit-shift op
604 static const struct glsl_type
*
605 shift_result_type(const struct glsl_type
*type_a
,
606 const struct glsl_type
*type_b
,
608 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
610 if (!state
->check_bitwise_operations_allowed(loc
)) {
611 return glsl_type::error_type
;
614 /* From page 50 (page 56 of the PDF) of the GLSL 1.30 spec:
616 * "The shift operators (<<) and (>>). For both operators, the operands
617 * must be signed or unsigned integers or integer vectors. One operand
618 * can be signed while the other is unsigned."
620 if (!type_a
->is_integer()) {
621 _mesa_glsl_error(loc
, state
, "LHS of operator %s must be an integer or "
622 "integer vector", ast_expression::operator_string(op
));
623 return glsl_type::error_type
;
626 if (!type_b
->is_integer()) {
627 _mesa_glsl_error(loc
, state
, "RHS of operator %s must be an integer or "
628 "integer vector", ast_expression::operator_string(op
));
629 return glsl_type::error_type
;
632 /* "If the first operand is a scalar, the second operand has to be
635 if (type_a
->is_scalar() && !type_b
->is_scalar()) {
636 _mesa_glsl_error(loc
, state
, "if the first operand of %s is scalar, the "
637 "second must be scalar as well",
638 ast_expression::operator_string(op
));
639 return glsl_type::error_type
;
642 /* If both operands are vectors, check that they have same number of
645 if (type_a
->is_vector() &&
646 type_b
->is_vector() &&
647 type_a
->vector_elements
!= type_b
->vector_elements
) {
648 _mesa_glsl_error(loc
, state
, "vector operands to operator %s must "
649 "have same number of elements",
650 ast_expression::operator_string(op
));
651 return glsl_type::error_type
;
654 /* "In all cases, the resulting type will be the same type as the left
661 * Validates that a value can be assigned to a location with a specified type
663 * Validates that \c rhs can be assigned to some location. If the types are
664 * not an exact match but an automatic conversion is possible, \c rhs will be
668 * \c NULL if \c rhs cannot be assigned to a location with type \c lhs_type.
669 * Otherwise the actual RHS to be assigned will be returned. This may be
670 * \c rhs, or it may be \c rhs after some type conversion.
673 * In addition to being used for assignments, this function is used to
674 * type-check return values.
677 validate_assignment(struct _mesa_glsl_parse_state
*state
,
678 YYLTYPE loc
, const glsl_type
*lhs_type
,
679 ir_rvalue
*rhs
, bool is_initializer
)
681 /* If there is already some error in the RHS, just return it. Anything
682 * else will lead to an avalanche of error message back to the user.
684 if (rhs
->type
->is_error())
687 /* If the types are identical, the assignment can trivially proceed.
689 if (rhs
->type
== lhs_type
)
692 /* If the array element types are the same and the LHS is unsized,
693 * the assignment is okay for initializers embedded in variable
696 * Note: Whole-array assignments are not permitted in GLSL 1.10, but this
697 * is handled by ir_dereference::is_lvalue.
699 if (lhs_type
->is_unsized_array() && rhs
->type
->is_array()
700 && (lhs_type
->element_type() == rhs
->type
->element_type())) {
701 if (is_initializer
) {
704 _mesa_glsl_error(&loc
, state
,
705 "implicitly sized arrays cannot be assigned");
710 /* Check for implicit conversion in GLSL 1.20 */
711 if (apply_implicit_conversion(lhs_type
, rhs
, state
)) {
712 if (rhs
->type
== lhs_type
)
716 _mesa_glsl_error(&loc
, state
,
717 "%s of type %s cannot be assigned to "
718 "variable of type %s",
719 is_initializer
? "initializer" : "value",
720 rhs
->type
->name
, lhs_type
->name
);
726 mark_whole_array_access(ir_rvalue
*access
)
728 ir_dereference_variable
*deref
= access
->as_dereference_variable();
730 if (deref
&& deref
->var
) {
731 deref
->var
->data
.max_array_access
= deref
->type
->length
- 1;
736 do_assignment(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
,
737 const char *non_lvalue_description
,
738 ir_rvalue
*lhs
, ir_rvalue
*rhs
, bool is_initializer
,
742 bool error_emitted
= (lhs
->type
->is_error() || rhs
->type
->is_error());
744 /* If the assignment LHS comes back as an ir_binop_vector_extract
745 * expression, move it to the RHS as an ir_triop_vector_insert.
747 if (lhs
->ir_type
== ir_type_expression
) {
748 ir_expression
*const lhs_expr
= lhs
->as_expression();
750 if (unlikely(lhs_expr
->operation
== ir_binop_vector_extract
)) {
752 validate_assignment(state
, lhs_loc
, lhs
->type
,
753 rhs
, is_initializer
);
755 if (new_rhs
== NULL
) {
758 rhs
= new(ctx
) ir_expression(ir_triop_vector_insert
,
759 lhs_expr
->operands
[0]->type
,
760 lhs_expr
->operands
[0],
762 lhs_expr
->operands
[1]);
763 lhs
= lhs_expr
->operands
[0]->clone(ctx
, NULL
);
768 ir_variable
*lhs_var
= lhs
->variable_referenced();
770 lhs_var
->data
.assigned
= true;
772 if (!error_emitted
) {
773 if (non_lvalue_description
!= NULL
) {
774 _mesa_glsl_error(&lhs_loc
, state
,
776 non_lvalue_description
);
777 error_emitted
= true;
778 } else if (lhs
->variable_referenced() != NULL
779 && lhs
->variable_referenced()->data
.read_only
) {
780 _mesa_glsl_error(&lhs_loc
, state
,
781 "assignment to read-only variable '%s'",
782 lhs
->variable_referenced()->name
);
783 error_emitted
= true;
785 } else if (lhs
->type
->is_array() &&
786 !state
->check_version(120, 300, &lhs_loc
,
787 "whole array assignment forbidden")) {
788 /* From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
790 * "Other binary or unary expressions, non-dereferenced
791 * arrays, function names, swizzles with repeated fields,
792 * and constants cannot be l-values."
794 * The restriction on arrays is lifted in GLSL 1.20 and GLSL ES 3.00.
796 error_emitted
= true;
797 } else if (!lhs
->is_lvalue()) {
798 _mesa_glsl_error(& lhs_loc
, state
, "non-lvalue in assignment");
799 error_emitted
= true;
804 validate_assignment(state
, lhs_loc
, lhs
->type
, rhs
, is_initializer
);
805 if (new_rhs
!= NULL
) {
808 /* If the LHS array was not declared with a size, it takes it size from
809 * the RHS. If the LHS is an l-value and a whole array, it must be a
810 * dereference of a variable. Any other case would require that the LHS
811 * is either not an l-value or not a whole array.
813 if (lhs
->type
->is_unsized_array()) {
814 ir_dereference
*const d
= lhs
->as_dereference();
818 ir_variable
*const var
= d
->variable_referenced();
822 if (var
->data
.max_array_access
>= unsigned(rhs
->type
->array_size())) {
823 /* FINISHME: This should actually log the location of the RHS. */
824 _mesa_glsl_error(& lhs_loc
, state
, "array size must be > %u due to "
826 var
->data
.max_array_access
);
829 var
->type
= glsl_type::get_array_instance(lhs
->type
->element_type(),
830 rhs
->type
->array_size());
833 if (lhs
->type
->is_array()) {
834 mark_whole_array_access(rhs
);
835 mark_whole_array_access(lhs
);
839 /* Most callers of do_assignment (assign, add_assign, pre_inc/dec,
840 * but not post_inc) need the converted assigned value as an rvalue
841 * to handle things like:
845 * So we always just store the computed value being assigned to a
846 * temporary and return a deref of that temporary. If the rvalue
847 * ends up not being used, the temp will get copy-propagated out.
849 ir_variable
*var
= new(ctx
) ir_variable(rhs
->type
, "assignment_tmp",
851 ir_dereference_variable
*deref_var
= new(ctx
) ir_dereference_variable(var
);
852 instructions
->push_tail(var
);
853 instructions
->push_tail(new(ctx
) ir_assignment(deref_var
, rhs
));
854 deref_var
= new(ctx
) ir_dereference_variable(var
);
857 instructions
->push_tail(new(ctx
) ir_assignment(lhs
, deref_var
));
859 return new(ctx
) ir_dereference_variable(var
);
863 get_lvalue_copy(exec_list
*instructions
, ir_rvalue
*lvalue
)
865 void *ctx
= ralloc_parent(lvalue
);
868 var
= new(ctx
) ir_variable(lvalue
->type
, "_post_incdec_tmp",
870 instructions
->push_tail(var
);
871 var
->data
.mode
= ir_var_auto
;
873 instructions
->push_tail(new(ctx
) ir_assignment(new(ctx
) ir_dereference_variable(var
),
876 return new(ctx
) ir_dereference_variable(var
);
881 ast_node::hir(exec_list
*instructions
,
882 struct _mesa_glsl_parse_state
*state
)
891 do_comparison(void *mem_ctx
, int operation
, ir_rvalue
*op0
, ir_rvalue
*op1
)
894 ir_rvalue
*cmp
= NULL
;
896 if (operation
== ir_binop_all_equal
)
897 join_op
= ir_binop_logic_and
;
899 join_op
= ir_binop_logic_or
;
901 switch (op0
->type
->base_type
) {
902 case GLSL_TYPE_FLOAT
:
906 return new(mem_ctx
) ir_expression(operation
, op0
, op1
);
908 case GLSL_TYPE_ARRAY
: {
909 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
910 ir_rvalue
*e0
, *e1
, *result
;
912 e0
= new(mem_ctx
) ir_dereference_array(op0
->clone(mem_ctx
, NULL
),
913 new(mem_ctx
) ir_constant(i
));
914 e1
= new(mem_ctx
) ir_dereference_array(op1
->clone(mem_ctx
, NULL
),
915 new(mem_ctx
) ir_constant(i
));
916 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
919 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
925 mark_whole_array_access(op0
);
926 mark_whole_array_access(op1
);
930 case GLSL_TYPE_STRUCT
: {
931 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
932 ir_rvalue
*e0
, *e1
, *result
;
933 const char *field_name
= op0
->type
->fields
.structure
[i
].name
;
935 e0
= new(mem_ctx
) ir_dereference_record(op0
->clone(mem_ctx
, NULL
),
937 e1
= new(mem_ctx
) ir_dereference_record(op1
->clone(mem_ctx
, NULL
),
939 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
942 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
950 case GLSL_TYPE_ERROR
:
952 case GLSL_TYPE_SAMPLER
:
953 case GLSL_TYPE_INTERFACE
:
954 case GLSL_TYPE_ATOMIC_UINT
:
955 /* I assume a comparison of a struct containing a sampler just
956 * ignores the sampler present in the type.
962 cmp
= new(mem_ctx
) ir_constant(true);
967 /* For logical operations, we want to ensure that the operands are
968 * scalar booleans. If it isn't, emit an error and return a constant
969 * boolean to avoid triggering cascading error messages.
972 get_scalar_boolean_operand(exec_list
*instructions
,
973 struct _mesa_glsl_parse_state
*state
,
974 ast_expression
*parent_expr
,
976 const char *operand_name
,
979 ast_expression
*expr
= parent_expr
->subexpressions
[operand
];
981 ir_rvalue
*val
= expr
->hir(instructions
, state
);
983 if (val
->type
->is_boolean() && val
->type
->is_scalar())
986 if (!*error_emitted
) {
987 YYLTYPE loc
= expr
->get_location();
988 _mesa_glsl_error(&loc
, state
, "%s of `%s' must be scalar boolean",
990 parent_expr
->operator_string(parent_expr
->oper
));
991 *error_emitted
= true;
994 return new(ctx
) ir_constant(true);
998 * If name refers to a builtin array whose maximum allowed size is less than
999 * size, report an error and return true. Otherwise return false.
1002 check_builtin_array_max_size(const char *name
, unsigned size
,
1003 YYLTYPE loc
, struct _mesa_glsl_parse_state
*state
)
1005 if ((strcmp("gl_TexCoord", name
) == 0)
1006 && (size
> state
->Const
.MaxTextureCoords
)) {
1007 /* From page 54 (page 60 of the PDF) of the GLSL 1.20 spec:
1009 * "The size [of gl_TexCoord] can be at most
1010 * gl_MaxTextureCoords."
1012 _mesa_glsl_error(&loc
, state
, "`gl_TexCoord' array size cannot "
1013 "be larger than gl_MaxTextureCoords (%u)",
1014 state
->Const
.MaxTextureCoords
);
1015 } else if (strcmp("gl_ClipDistance", name
) == 0
1016 && size
> state
->Const
.MaxClipPlanes
) {
1017 /* From section 7.1 (Vertex Shader Special Variables) of the
1020 * "The gl_ClipDistance array is predeclared as unsized and
1021 * must be sized by the shader either redeclaring it with a
1022 * size or indexing it only with integral constant
1023 * expressions. ... The size can be at most
1024 * gl_MaxClipDistances."
1026 _mesa_glsl_error(&loc
, state
, "`gl_ClipDistance' array size cannot "
1027 "be larger than gl_MaxClipDistances (%u)",
1028 state
->Const
.MaxClipPlanes
);
1033 * Create the constant 1, of a which is appropriate for incrementing and
1034 * decrementing values of the given GLSL type. For example, if type is vec4,
1035 * this creates a constant value of 1.0 having type float.
1037 * If the given type is invalid for increment and decrement operators, return
1038 * a floating point 1--the error will be detected later.
1041 constant_one_for_inc_dec(void *ctx
, const glsl_type
*type
)
1043 switch (type
->base_type
) {
1044 case GLSL_TYPE_UINT
:
1045 return new(ctx
) ir_constant((unsigned) 1);
1047 return new(ctx
) ir_constant(1);
1049 case GLSL_TYPE_FLOAT
:
1050 return new(ctx
) ir_constant(1.0f
);
1055 ast_expression::hir(exec_list
*instructions
,
1056 struct _mesa_glsl_parse_state
*state
)
1059 static const int operations
[AST_NUM_OPERATORS
] = {
1060 -1, /* ast_assign doesn't convert to ir_expression. */
1061 -1, /* ast_plus doesn't convert to ir_expression. */
1075 ir_binop_any_nequal
,
1085 /* Note: The following block of expression types actually convert
1086 * to multiple IR instructions.
1088 ir_binop_mul
, /* ast_mul_assign */
1089 ir_binop_div
, /* ast_div_assign */
1090 ir_binop_mod
, /* ast_mod_assign */
1091 ir_binop_add
, /* ast_add_assign */
1092 ir_binop_sub
, /* ast_sub_assign */
1093 ir_binop_lshift
, /* ast_ls_assign */
1094 ir_binop_rshift
, /* ast_rs_assign */
1095 ir_binop_bit_and
, /* ast_and_assign */
1096 ir_binop_bit_xor
, /* ast_xor_assign */
1097 ir_binop_bit_or
, /* ast_or_assign */
1099 -1, /* ast_conditional doesn't convert to ir_expression. */
1100 ir_binop_add
, /* ast_pre_inc. */
1101 ir_binop_sub
, /* ast_pre_dec. */
1102 ir_binop_add
, /* ast_post_inc. */
1103 ir_binop_sub
, /* ast_post_dec. */
1104 -1, /* ast_field_selection doesn't conv to ir_expression. */
1105 -1, /* ast_array_index doesn't convert to ir_expression. */
1106 -1, /* ast_function_call doesn't conv to ir_expression. */
1107 -1, /* ast_identifier doesn't convert to ir_expression. */
1108 -1, /* ast_int_constant doesn't convert to ir_expression. */
1109 -1, /* ast_uint_constant doesn't conv to ir_expression. */
1110 -1, /* ast_float_constant doesn't conv to ir_expression. */
1111 -1, /* ast_bool_constant doesn't conv to ir_expression. */
1112 -1, /* ast_sequence doesn't convert to ir_expression. */
1114 ir_rvalue
*result
= NULL
;
1116 const struct glsl_type
*type
; /* a temporary variable for switch cases */
1117 bool error_emitted
= false;
1120 loc
= this->get_location();
1122 switch (this->oper
) {
1124 assert(!"ast_aggregate: Should never get here.");
1128 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1129 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1131 result
= do_assignment(instructions
, state
,
1132 this->subexpressions
[0]->non_lvalue_description
,
1133 op
[0], op
[1], false,
1134 this->subexpressions
[0]->get_location());
1135 error_emitted
= result
->type
->is_error();
1140 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1142 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1144 error_emitted
= type
->is_error();
1150 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1152 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1154 error_emitted
= type
->is_error();
1156 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1164 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1165 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1167 type
= arithmetic_result_type(op
[0], op
[1],
1168 (this->oper
== ast_mul
),
1170 error_emitted
= type
->is_error();
1172 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1177 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1178 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1180 type
= modulus_result_type(op
[0]->type
, op
[1]->type
, state
, & loc
);
1182 assert(operations
[this->oper
] == ir_binop_mod
);
1184 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1186 error_emitted
= type
->is_error();
1191 if (!state
->check_bitwise_operations_allowed(&loc
)) {
1192 error_emitted
= true;
1195 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1196 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1197 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1199 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1201 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1208 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1209 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1211 type
= relational_result_type(op
[0], op
[1], state
, & loc
);
1213 /* The relational operators must either generate an error or result
1214 * in a scalar boolean. See page 57 of the GLSL 1.50 spec.
1216 assert(type
->is_error()
1217 || ((type
->base_type
== GLSL_TYPE_BOOL
)
1218 && type
->is_scalar()));
1220 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1222 error_emitted
= type
->is_error();
1227 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1228 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1230 /* From page 58 (page 64 of the PDF) of the GLSL 1.50 spec:
1232 * "The equality operators equal (==), and not equal (!=)
1233 * operate on all types. They result in a scalar Boolean. If
1234 * the operand types do not match, then there must be a
1235 * conversion from Section 4.1.10 "Implicit Conversions"
1236 * applied to one operand that can make them match, in which
1237 * case this conversion is done."
1239 if ((!apply_implicit_conversion(op
[0]->type
, op
[1], state
)
1240 && !apply_implicit_conversion(op
[1]->type
, op
[0], state
))
1241 || (op
[0]->type
!= op
[1]->type
)) {
1242 _mesa_glsl_error(& loc
, state
, "operands of `%s' must have the same "
1243 "type", (this->oper
== ast_equal
) ? "==" : "!=");
1244 error_emitted
= true;
1245 } else if ((op
[0]->type
->is_array() || op
[1]->type
->is_array()) &&
1246 !state
->check_version(120, 300, &loc
,
1247 "array comparisons forbidden")) {
1248 error_emitted
= true;
1249 } else if ((op
[0]->type
->contains_opaque() ||
1250 op
[1]->type
->contains_opaque())) {
1251 _mesa_glsl_error(&loc
, state
, "opaque type comparisons forbidden");
1252 error_emitted
= true;
1255 if (error_emitted
) {
1256 result
= new(ctx
) ir_constant(false);
1258 result
= do_comparison(ctx
, operations
[this->oper
], op
[0], op
[1]);
1259 assert(result
->type
== glsl_type::bool_type
);
1266 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1267 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1268 type
= bit_logic_result_type(op
[0]->type
, op
[1]->type
, this->oper
,
1270 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1272 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1276 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1278 if (!state
->check_bitwise_operations_allowed(&loc
)) {
1279 error_emitted
= true;
1282 if (!op
[0]->type
->is_integer()) {
1283 _mesa_glsl_error(&loc
, state
, "operand of `~' must be an integer");
1284 error_emitted
= true;
1287 type
= error_emitted
? glsl_type::error_type
: op
[0]->type
;
1288 result
= new(ctx
) ir_expression(ir_unop_bit_not
, type
, op
[0], NULL
);
1291 case ast_logic_and
: {
1292 exec_list rhs_instructions
;
1293 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1294 "LHS", &error_emitted
);
1295 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1296 "RHS", &error_emitted
);
1298 if (rhs_instructions
.is_empty()) {
1299 result
= new(ctx
) ir_expression(ir_binop_logic_and
, op
[0], op
[1]);
1300 type
= result
->type
;
1302 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1305 instructions
->push_tail(tmp
);
1307 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1308 instructions
->push_tail(stmt
);
1310 stmt
->then_instructions
.append_list(&rhs_instructions
);
1311 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1312 ir_assignment
*const then_assign
=
1313 new(ctx
) ir_assignment(then_deref
, op
[1]);
1314 stmt
->then_instructions
.push_tail(then_assign
);
1316 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1317 ir_assignment
*const else_assign
=
1318 new(ctx
) ir_assignment(else_deref
, new(ctx
) ir_constant(false));
1319 stmt
->else_instructions
.push_tail(else_assign
);
1321 result
= new(ctx
) ir_dereference_variable(tmp
);
1327 case ast_logic_or
: {
1328 exec_list rhs_instructions
;
1329 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1330 "LHS", &error_emitted
);
1331 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1332 "RHS", &error_emitted
);
1334 if (rhs_instructions
.is_empty()) {
1335 result
= new(ctx
) ir_expression(ir_binop_logic_or
, op
[0], op
[1]);
1336 type
= result
->type
;
1338 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1341 instructions
->push_tail(tmp
);
1343 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1344 instructions
->push_tail(stmt
);
1346 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1347 ir_assignment
*const then_assign
=
1348 new(ctx
) ir_assignment(then_deref
, new(ctx
) ir_constant(true));
1349 stmt
->then_instructions
.push_tail(then_assign
);
1351 stmt
->else_instructions
.append_list(&rhs_instructions
);
1352 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1353 ir_assignment
*const else_assign
=
1354 new(ctx
) ir_assignment(else_deref
, op
[1]);
1355 stmt
->else_instructions
.push_tail(else_assign
);
1357 result
= new(ctx
) ir_dereference_variable(tmp
);
1364 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1366 * "The logical binary operators and (&&), or ( | | ), and
1367 * exclusive or (^^). They operate only on two Boolean
1368 * expressions and result in a Boolean expression."
1370 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0, "LHS",
1372 op
[1] = get_scalar_boolean_operand(instructions
, state
, this, 1, "RHS",
1375 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1380 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1381 "operand", &error_emitted
);
1383 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1387 case ast_mul_assign
:
1388 case ast_div_assign
:
1389 case ast_add_assign
:
1390 case ast_sub_assign
: {
1391 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1392 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1394 type
= arithmetic_result_type(op
[0], op
[1],
1395 (this->oper
== ast_mul_assign
),
1398 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1401 result
= do_assignment(instructions
, state
,
1402 this->subexpressions
[0]->non_lvalue_description
,
1403 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1404 this->subexpressions
[0]->get_location());
1405 error_emitted
= (op
[0]->type
->is_error());
1407 /* GLSL 1.10 does not allow array assignment. However, we don't have to
1408 * explicitly test for this because none of the binary expression
1409 * operators allow array operands either.
1415 case ast_mod_assign
: {
1416 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1417 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1419 type
= modulus_result_type(op
[0]->type
, op
[1]->type
, state
, & loc
);
1421 assert(operations
[this->oper
] == ir_binop_mod
);
1423 ir_rvalue
*temp_rhs
;
1424 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1427 result
= do_assignment(instructions
, state
,
1428 this->subexpressions
[0]->non_lvalue_description
,
1429 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1430 this->subexpressions
[0]->get_location());
1431 error_emitted
= type
->is_error();
1436 case ast_rs_assign
: {
1437 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1438 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1439 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1441 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1442 type
, op
[0], op
[1]);
1443 result
= do_assignment(instructions
, state
,
1444 this->subexpressions
[0]->non_lvalue_description
,
1445 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1446 this->subexpressions
[0]->get_location());
1447 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1451 case ast_and_assign
:
1452 case ast_xor_assign
:
1453 case ast_or_assign
: {
1454 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1455 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1456 type
= bit_logic_result_type(op
[0]->type
, op
[1]->type
, this->oper
,
1458 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1459 type
, op
[0], op
[1]);
1460 result
= do_assignment(instructions
, state
,
1461 this->subexpressions
[0]->non_lvalue_description
,
1462 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1463 this->subexpressions
[0]->get_location());
1464 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1468 case ast_conditional
: {
1469 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1471 * "The ternary selection operator (?:). It operates on three
1472 * expressions (exp1 ? exp2 : exp3). This operator evaluates the
1473 * first expression, which must result in a scalar Boolean."
1475 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1476 "condition", &error_emitted
);
1478 /* The :? operator is implemented by generating an anonymous temporary
1479 * followed by an if-statement. The last instruction in each branch of
1480 * the if-statement assigns a value to the anonymous temporary. This
1481 * temporary is the r-value of the expression.
1483 exec_list then_instructions
;
1484 exec_list else_instructions
;
1486 op
[1] = this->subexpressions
[1]->hir(&then_instructions
, state
);
1487 op
[2] = this->subexpressions
[2]->hir(&else_instructions
, state
);
1489 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1491 * "The second and third expressions can be any type, as
1492 * long their types match, or there is a conversion in
1493 * Section 4.1.10 "Implicit Conversions" that can be applied
1494 * to one of the expressions to make their types match. This
1495 * resulting matching type is the type of the entire
1498 if ((!apply_implicit_conversion(op
[1]->type
, op
[2], state
)
1499 && !apply_implicit_conversion(op
[2]->type
, op
[1], state
))
1500 || (op
[1]->type
!= op
[2]->type
)) {
1501 YYLTYPE loc
= this->subexpressions
[1]->get_location();
1503 _mesa_glsl_error(& loc
, state
, "second and third operands of ?: "
1504 "operator must have matching types");
1505 error_emitted
= true;
1506 type
= glsl_type::error_type
;
1511 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1513 * "The second and third expressions must be the same type, but can
1514 * be of any type other than an array."
1516 if (type
->is_array() &&
1517 !state
->check_version(120, 300, &loc
,
1518 "second and third operands of ?: operator "
1519 "cannot be arrays")) {
1520 error_emitted
= true;
1523 ir_constant
*cond_val
= op
[0]->constant_expression_value();
1524 ir_constant
*then_val
= op
[1]->constant_expression_value();
1525 ir_constant
*else_val
= op
[2]->constant_expression_value();
1527 if (then_instructions
.is_empty()
1528 && else_instructions
.is_empty()
1529 && (cond_val
!= NULL
) && (then_val
!= NULL
) && (else_val
!= NULL
)) {
1530 result
= (cond_val
->value
.b
[0]) ? then_val
: else_val
;
1532 ir_variable
*const tmp
=
1533 new(ctx
) ir_variable(type
, "conditional_tmp", ir_var_temporary
);
1534 instructions
->push_tail(tmp
);
1536 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1537 instructions
->push_tail(stmt
);
1539 then_instructions
.move_nodes_to(& stmt
->then_instructions
);
1540 ir_dereference
*const then_deref
=
1541 new(ctx
) ir_dereference_variable(tmp
);
1542 ir_assignment
*const then_assign
=
1543 new(ctx
) ir_assignment(then_deref
, op
[1]);
1544 stmt
->then_instructions
.push_tail(then_assign
);
1546 else_instructions
.move_nodes_to(& stmt
->else_instructions
);
1547 ir_dereference
*const else_deref
=
1548 new(ctx
) ir_dereference_variable(tmp
);
1549 ir_assignment
*const else_assign
=
1550 new(ctx
) ir_assignment(else_deref
, op
[2]);
1551 stmt
->else_instructions
.push_tail(else_assign
);
1553 result
= new(ctx
) ir_dereference_variable(tmp
);
1560 this->non_lvalue_description
= (this->oper
== ast_pre_inc
)
1561 ? "pre-increment operation" : "pre-decrement operation";
1563 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1564 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1566 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1568 ir_rvalue
*temp_rhs
;
1569 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1572 result
= do_assignment(instructions
, state
,
1573 this->subexpressions
[0]->non_lvalue_description
,
1574 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1575 this->subexpressions
[0]->get_location());
1576 error_emitted
= op
[0]->type
->is_error();
1581 case ast_post_dec
: {
1582 this->non_lvalue_description
= (this->oper
== ast_post_inc
)
1583 ? "post-increment operation" : "post-decrement operation";
1584 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1585 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1587 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1589 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1591 ir_rvalue
*temp_rhs
;
1592 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1595 /* Get a temporary of a copy of the lvalue before it's modified.
1596 * This may get thrown away later.
1598 result
= get_lvalue_copy(instructions
, op
[0]->clone(ctx
, NULL
));
1600 (void)do_assignment(instructions
, state
,
1601 this->subexpressions
[0]->non_lvalue_description
,
1602 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1603 this->subexpressions
[0]->get_location());
1605 error_emitted
= op
[0]->type
->is_error();
1609 case ast_field_selection
:
1610 result
= _mesa_ast_field_selection_to_hir(this, instructions
, state
);
1613 case ast_array_index
: {
1614 YYLTYPE index_loc
= subexpressions
[1]->get_location();
1616 op
[0] = subexpressions
[0]->hir(instructions
, state
);
1617 op
[1] = subexpressions
[1]->hir(instructions
, state
);
1619 result
= _mesa_ast_array_index_to_hir(ctx
, state
, op
[0], op
[1],
1622 if (result
->type
->is_error())
1623 error_emitted
= true;
1628 case ast_function_call
:
1629 /* Should *NEVER* get here. ast_function_call should always be handled
1630 * by ast_function_expression::hir.
1635 case ast_identifier
: {
1636 /* ast_identifier can appear several places in a full abstract syntax
1637 * tree. This particular use must be at location specified in the grammar
1638 * as 'variable_identifier'.
1641 state
->symbols
->get_variable(this->primary_expression
.identifier
);
1644 var
->data
.used
= true;
1645 result
= new(ctx
) ir_dereference_variable(var
);
1647 _mesa_glsl_error(& loc
, state
, "`%s' undeclared",
1648 this->primary_expression
.identifier
);
1650 result
= ir_rvalue::error_value(ctx
);
1651 error_emitted
= true;
1656 case ast_int_constant
:
1657 result
= new(ctx
) ir_constant(this->primary_expression
.int_constant
);
1660 case ast_uint_constant
:
1661 result
= new(ctx
) ir_constant(this->primary_expression
.uint_constant
);
1664 case ast_float_constant
:
1665 result
= new(ctx
) ir_constant(this->primary_expression
.float_constant
);
1668 case ast_bool_constant
:
1669 result
= new(ctx
) ir_constant(bool(this->primary_expression
.bool_constant
));
1672 case ast_sequence
: {
1673 /* It should not be possible to generate a sequence in the AST without
1674 * any expressions in it.
1676 assert(!this->expressions
.is_empty());
1678 /* The r-value of a sequence is the last expression in the sequence. If
1679 * the other expressions in the sequence do not have side-effects (and
1680 * therefore add instructions to the instruction list), they get dropped
1683 exec_node
*previous_tail_pred
= NULL
;
1684 YYLTYPE previous_operand_loc
= loc
;
1686 foreach_list_typed (ast_node
, ast
, link
, &this->expressions
) {
1687 /* If one of the operands of comma operator does not generate any
1688 * code, we want to emit a warning. At each pass through the loop
1689 * previous_tail_pred will point to the last instruction in the
1690 * stream *before* processing the previous operand. Naturally,
1691 * instructions->tail_pred will point to the last instruction in the
1692 * stream *after* processing the previous operand. If the two
1693 * pointers match, then the previous operand had no effect.
1695 * The warning behavior here differs slightly from GCC. GCC will
1696 * only emit a warning if none of the left-hand operands have an
1697 * effect. However, it will emit a warning for each. I believe that
1698 * there are some cases in C (especially with GCC extensions) where
1699 * it is useful to have an intermediate step in a sequence have no
1700 * effect, but I don't think these cases exist in GLSL. Either way,
1701 * it would be a giant hassle to replicate that behavior.
1703 if (previous_tail_pred
== instructions
->tail_pred
) {
1704 _mesa_glsl_warning(&previous_operand_loc
, state
,
1705 "left-hand operand of comma expression has "
1709 /* tail_pred is directly accessed instead of using the get_tail()
1710 * method for performance reasons. get_tail() has extra code to
1711 * return NULL when the list is empty. We don't care about that
1712 * here, so using tail_pred directly is fine.
1714 previous_tail_pred
= instructions
->tail_pred
;
1715 previous_operand_loc
= ast
->get_location();
1717 result
= ast
->hir(instructions
, state
);
1720 /* Any errors should have already been emitted in the loop above.
1722 error_emitted
= true;
1726 type
= NULL
; /* use result->type, not type. */
1727 assert(result
!= NULL
);
1729 if (result
->type
->is_error() && !error_emitted
)
1730 _mesa_glsl_error(& loc
, state
, "type mismatch");
1737 ast_expression_statement::hir(exec_list
*instructions
,
1738 struct _mesa_glsl_parse_state
*state
)
1740 /* It is possible to have expression statements that don't have an
1741 * expression. This is the solitary semicolon:
1743 * for (i = 0; i < 5; i++)
1746 * In this case the expression will be NULL. Test for NULL and don't do
1747 * anything in that case.
1749 if (expression
!= NULL
)
1750 expression
->hir(instructions
, state
);
1752 /* Statements do not have r-values.
1759 ast_compound_statement::hir(exec_list
*instructions
,
1760 struct _mesa_glsl_parse_state
*state
)
1763 state
->symbols
->push_scope();
1765 foreach_list_typed (ast_node
, ast
, link
, &this->statements
)
1766 ast
->hir(instructions
, state
);
1769 state
->symbols
->pop_scope();
1771 /* Compound statements do not have r-values.
1777 * Evaluate the given exec_node (which should be an ast_node representing
1778 * a single array dimension) and return its integer value.
1780 static const unsigned
1781 process_array_size(exec_node
*node
,
1782 struct _mesa_glsl_parse_state
*state
)
1784 exec_list dummy_instructions
;
1786 ast_node
*array_size
= exec_node_data(ast_node
, node
, link
);
1787 ir_rvalue
*const ir
= array_size
->hir(& dummy_instructions
,
1789 YYLTYPE loc
= array_size
->get_location();
1792 _mesa_glsl_error(& loc
, state
,
1793 "array size could not be resolved");
1797 if (!ir
->type
->is_integer()) {
1798 _mesa_glsl_error(& loc
, state
,
1799 "array size must be integer type");
1803 if (!ir
->type
->is_scalar()) {
1804 _mesa_glsl_error(& loc
, state
,
1805 "array size must be scalar type");
1809 ir_constant
*const size
= ir
->constant_expression_value();
1811 _mesa_glsl_error(& loc
, state
, "array size must be a "
1812 "constant valued expression");
1816 if (size
->value
.i
[0] <= 0) {
1817 _mesa_glsl_error(& loc
, state
, "array size must be > 0");
1821 assert(size
->type
== ir
->type
);
1823 /* If the array size is const (and we've verified that
1824 * it is) then no instructions should have been emitted
1825 * when we converted it to HIR. If they were emitted,
1826 * then either the array size isn't const after all, or
1827 * we are emitting unnecessary instructions.
1829 assert(dummy_instructions
.is_empty());
1831 return size
->value
.u
[0];
1834 static const glsl_type
*
1835 process_array_type(YYLTYPE
*loc
, const glsl_type
*base
,
1836 ast_array_specifier
*array_specifier
,
1837 struct _mesa_glsl_parse_state
*state
)
1839 const glsl_type
*array_type
= base
;
1841 if (array_specifier
!= NULL
) {
1842 if (base
->is_array()) {
1844 /* From page 19 (page 25) of the GLSL 1.20 spec:
1846 * "Only one-dimensional arrays may be declared."
1848 if (!state
->ARB_arrays_of_arrays_enable
) {
1849 _mesa_glsl_error(loc
, state
,
1850 "invalid array of `%s'"
1851 "GL_ARB_arrays_of_arrays "
1852 "required for defining arrays of arrays",
1854 return glsl_type::error_type
;
1857 if (base
->length
== 0) {
1858 _mesa_glsl_error(loc
, state
,
1859 "only the outermost array dimension can "
1862 return glsl_type::error_type
;
1866 for (exec_node
*node
= array_specifier
->array_dimensions
.tail_pred
;
1867 !node
->is_head_sentinel(); node
= node
->prev
) {
1868 unsigned array_size
= process_array_size(node
, state
);
1869 array_type
= glsl_type::get_array_instance(array_type
,
1873 if (array_specifier
->is_unsized_array
)
1874 array_type
= glsl_type::get_array_instance(array_type
, 0);
1882 ast_type_specifier::glsl_type(const char **name
,
1883 struct _mesa_glsl_parse_state
*state
) const
1885 const struct glsl_type
*type
;
1887 type
= state
->symbols
->get_type(this->type_name
);
1888 *name
= this->type_name
;
1890 YYLTYPE loc
= this->get_location();
1891 type
= process_array_type(&loc
, type
, this->array_specifier
, state
);
1897 ast_fully_specified_type::glsl_type(const char **name
,
1898 struct _mesa_glsl_parse_state
*state
) const
1900 const struct glsl_type
*type
= this->specifier
->glsl_type(name
, state
);
1905 if (type
->base_type
== GLSL_TYPE_FLOAT
1907 && state
->stage
== MESA_SHADER_FRAGMENT
1908 && this->qualifier
.precision
== ast_precision_none
1909 && state
->symbols
->get_variable("#default precision") == NULL
) {
1910 YYLTYPE loc
= this->get_location();
1911 _mesa_glsl_error(&loc
, state
,
1912 "no precision specified this scope for type `%s'",
1920 * Determine whether a toplevel variable declaration declares a varying. This
1921 * function operates by examining the variable's mode and the shader target,
1922 * so it correctly identifies linkage variables regardless of whether they are
1923 * declared using the deprecated "varying" syntax or the new "in/out" syntax.
1925 * Passing a non-toplevel variable declaration (e.g. a function parameter) to
1926 * this function will produce undefined results.
1929 is_varying_var(ir_variable
*var
, gl_shader_stage target
)
1932 case MESA_SHADER_VERTEX
:
1933 return var
->data
.mode
== ir_var_shader_out
;
1934 case MESA_SHADER_FRAGMENT
:
1935 return var
->data
.mode
== ir_var_shader_in
;
1937 return var
->data
.mode
== ir_var_shader_out
|| var
->data
.mode
== ir_var_shader_in
;
1943 * Matrix layout qualifiers are only allowed on certain types
1946 validate_matrix_layout_for_type(struct _mesa_glsl_parse_state
*state
,
1948 const glsl_type
*type
,
1951 if (var
&& !var
->is_in_uniform_block()) {
1952 /* Layout qualifiers may only apply to interface blocks and fields in
1955 _mesa_glsl_error(loc
, state
,
1956 "uniform block layout qualifiers row_major and "
1957 "column_major may not be applied to variables "
1958 "outside of uniform blocks");
1959 } else if (!type
->is_matrix()) {
1960 /* The OpenGL ES 3.0 conformance tests did not originally allow
1961 * matrix layout qualifiers on non-matrices. However, the OpenGL
1962 * 4.4 and OpenGL ES 3.0 (revision TBD) specifications were
1963 * amended to specifically allow these layouts on all types. Emit
1964 * a warning so that people know their code may not be portable.
1966 _mesa_glsl_warning(loc
, state
,
1967 "uniform block layout qualifiers row_major and "
1968 "column_major applied to non-matrix types may "
1969 "be rejected by older compilers");
1970 } else if (type
->is_record()) {
1971 /* We allow 'layout(row_major)' on structure types because it's the only
1972 * way to get row-major layouts on matrices contained in structures.
1974 _mesa_glsl_warning(loc
, state
,
1975 "uniform block layout qualifiers row_major and "
1976 "column_major applied to structure types is not "
1977 "strictly conformant and may be rejected by other "
1983 validate_binding_qualifier(struct _mesa_glsl_parse_state
*state
,
1986 const ast_type_qualifier
*qual
)
1988 if (var
->data
.mode
!= ir_var_uniform
) {
1989 _mesa_glsl_error(loc
, state
,
1990 "the \"binding\" qualifier only applies to uniforms");
1994 if (qual
->binding
< 0) {
1995 _mesa_glsl_error(loc
, state
, "binding values must be >= 0");
1999 const struct gl_context
*const ctx
= state
->ctx
;
2000 unsigned elements
= var
->type
->is_array() ? var
->type
->length
: 1;
2001 unsigned max_index
= qual
->binding
+ elements
- 1;
2003 if (var
->type
->is_interface()) {
2004 /* UBOs. From page 60 of the GLSL 4.20 specification:
2005 * "If the binding point for any uniform block instance is less than zero,
2006 * or greater than or equal to the implementation-dependent maximum
2007 * number of uniform buffer bindings, a compilation error will occur.
2008 * When the binding identifier is used with a uniform block instanced as
2009 * an array of size N, all elements of the array from binding through
2010 * binding + N – 1 must be within this range."
2012 * The implementation-dependent maximum is GL_MAX_UNIFORM_BUFFER_BINDINGS.
2014 if (max_index
>= ctx
->Const
.MaxUniformBufferBindings
) {
2015 _mesa_glsl_error(loc
, state
, "layout(binding = %d) for %d UBOs exceeds "
2016 "the maximum number of UBO binding points (%d)",
2017 qual
->binding
, elements
,
2018 ctx
->Const
.MaxUniformBufferBindings
);
2021 } else if (var
->type
->is_sampler() ||
2022 (var
->type
->is_array() && var
->type
->fields
.array
->is_sampler())) {
2023 /* Samplers. From page 63 of the GLSL 4.20 specification:
2024 * "If the binding is less than zero, or greater than or equal to the
2025 * implementation-dependent maximum supported number of units, a
2026 * compilation error will occur. When the binding identifier is used
2027 * with an array of size N, all elements of the array from binding
2028 * through binding + N - 1 must be within this range."
2030 unsigned limit
= ctx
->Const
.Program
[state
->stage
].MaxTextureImageUnits
;
2032 if (max_index
>= limit
) {
2033 _mesa_glsl_error(loc
, state
, "layout(binding = %d) for %d samplers "
2034 "exceeds the maximum number of texture image units "
2035 "(%d)", qual
->binding
, elements
, limit
);
2039 } else if (var
->type
->contains_atomic()) {
2040 assert(ctx
->Const
.MaxAtomicBufferBindings
<= MAX_COMBINED_ATOMIC_BUFFERS
);
2041 if (unsigned(qual
->binding
) >= ctx
->Const
.MaxAtomicBufferBindings
) {
2042 _mesa_glsl_error(loc
, state
, "layout(binding = %d) exceeds the "
2043 " maximum number of atomic counter buffer bindings"
2044 "(%d)", qual
->binding
,
2045 ctx
->Const
.MaxAtomicBufferBindings
);
2050 _mesa_glsl_error(loc
, state
,
2051 "the \"binding\" qualifier only applies to uniform "
2052 "blocks, samplers, atomic counters, or arrays thereof");
2060 static glsl_interp_qualifier
2061 interpret_interpolation_qualifier(const struct ast_type_qualifier
*qual
,
2062 ir_variable_mode mode
,
2063 struct _mesa_glsl_parse_state
*state
,
2066 glsl_interp_qualifier interpolation
;
2067 if (qual
->flags
.q
.flat
)
2068 interpolation
= INTERP_QUALIFIER_FLAT
;
2069 else if (qual
->flags
.q
.noperspective
)
2070 interpolation
= INTERP_QUALIFIER_NOPERSPECTIVE
;
2071 else if (qual
->flags
.q
.smooth
)
2072 interpolation
= INTERP_QUALIFIER_SMOOTH
;
2074 interpolation
= INTERP_QUALIFIER_NONE
;
2076 if (interpolation
!= INTERP_QUALIFIER_NONE
) {
2077 if (mode
!= ir_var_shader_in
&& mode
!= ir_var_shader_out
) {
2078 _mesa_glsl_error(loc
, state
,
2079 "interpolation qualifier `%s' can only be applied to "
2080 "shader inputs or outputs.",
2081 interpolation_string(interpolation
));
2085 if ((state
->stage
== MESA_SHADER_VERTEX
&& mode
== ir_var_shader_in
) ||
2086 (state
->stage
== MESA_SHADER_FRAGMENT
&& mode
== ir_var_shader_out
)) {
2087 _mesa_glsl_error(loc
, state
,
2088 "interpolation qualifier `%s' cannot be applied to "
2089 "vertex shader inputs or fragment shader outputs",
2090 interpolation_string(interpolation
));
2094 return interpolation
;
2099 validate_explicit_location(const struct ast_type_qualifier
*qual
,
2101 struct _mesa_glsl_parse_state
*state
,
2106 /* In the vertex shader only shader inputs can be given explicit
2109 * In the fragment shader only shader outputs can be given explicit
2112 switch (state
->stage
) {
2113 case MESA_SHADER_VERTEX
:
2114 if (var
->data
.mode
== ir_var_shader_in
) {
2115 if (!state
->check_explicit_attrib_location_allowed(loc
, var
))
2124 case MESA_SHADER_GEOMETRY
:
2125 _mesa_glsl_error(loc
, state
,
2126 "geometry shader variables cannot be given "
2127 "explicit locations");
2130 case MESA_SHADER_FRAGMENT
:
2131 if (var
->data
.mode
== ir_var_shader_out
) {
2132 if (!state
->check_explicit_attrib_location_allowed(loc
, var
))
2143 _mesa_glsl_error(loc
, state
,
2144 "%s cannot be given an explicit location in %s shader",
2146 _mesa_shader_stage_to_string(state
->stage
));
2148 var
->data
.explicit_location
= true;
2150 /* This bit of silliness is needed because invalid explicit locations
2151 * are supposed to be flagged during linking. Small negative values
2152 * biased by VERT_ATTRIB_GENERIC0 or FRAG_RESULT_DATA0 could alias
2153 * built-in values (e.g., -16+VERT_ATTRIB_GENERIC0 = VERT_ATTRIB_POS).
2154 * The linker needs to be able to differentiate these cases. This
2155 * ensures that negative values stay negative.
2157 if (qual
->location
>= 0) {
2158 var
->data
.location
= (state
->stage
== MESA_SHADER_VERTEX
)
2159 ? (qual
->location
+ VERT_ATTRIB_GENERIC0
)
2160 : (qual
->location
+ FRAG_RESULT_DATA0
);
2162 var
->data
.location
= qual
->location
;
2165 if (qual
->flags
.q
.explicit_index
) {
2166 /* From the GLSL 4.30 specification, section 4.4.2 (Output
2167 * Layout Qualifiers):
2169 * "It is also a compile-time error if a fragment shader
2170 * sets a layout index to less than 0 or greater than 1."
2172 * Older specifications don't mandate a behavior; we take
2173 * this as a clarification and always generate the error.
2175 if (qual
->index
< 0 || qual
->index
> 1) {
2176 _mesa_glsl_error(loc
, state
,
2177 "explicit index may only be 0 or 1");
2179 var
->data
.explicit_index
= true;
2180 var
->data
.index
= qual
->index
;
2189 apply_type_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
2191 struct _mesa_glsl_parse_state
*state
,
2195 STATIC_ASSERT(sizeof(qual
->flags
.q
) <= sizeof(qual
->flags
.i
));
2197 if (qual
->flags
.q
.invariant
) {
2198 if (var
->data
.used
) {
2199 _mesa_glsl_error(loc
, state
,
2200 "variable `%s' may not be redeclared "
2201 "`invariant' after being used",
2204 var
->data
.invariant
= 1;
2208 if (qual
->flags
.q
.constant
|| qual
->flags
.q
.attribute
2209 || qual
->flags
.q
.uniform
2210 || (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_FRAGMENT
)))
2211 var
->data
.read_only
= 1;
2213 if (qual
->flags
.q
.centroid
)
2214 var
->data
.centroid
= 1;
2216 if (qual
->flags
.q
.sample
)
2217 var
->data
.sample
= 1;
2219 if (qual
->flags
.q
.attribute
&& state
->stage
!= MESA_SHADER_VERTEX
) {
2220 var
->type
= glsl_type::error_type
;
2221 _mesa_glsl_error(loc
, state
,
2222 "`attribute' variables may not be declared in the "
2224 _mesa_shader_stage_to_string(state
->stage
));
2227 /* Section 6.1.1 (Function Calling Conventions) of the GLSL 1.10 spec says:
2229 * "However, the const qualifier cannot be used with out or inout."
2231 * The same section of the GLSL 4.40 spec further clarifies this saying:
2233 * "The const qualifier cannot be used with out or inout, or a
2234 * compile-time error results."
2236 if (is_parameter
&& qual
->flags
.q
.constant
&& qual
->flags
.q
.out
) {
2237 _mesa_glsl_error(loc
, state
,
2238 "`const' may not be applied to `out' or `inout' "
2239 "function parameters");
2242 /* If there is no qualifier that changes the mode of the variable, leave
2243 * the setting alone.
2245 if (qual
->flags
.q
.in
&& qual
->flags
.q
.out
)
2246 var
->data
.mode
= ir_var_function_inout
;
2247 else if (qual
->flags
.q
.in
)
2248 var
->data
.mode
= is_parameter
? ir_var_function_in
: ir_var_shader_in
;
2249 else if (qual
->flags
.q
.attribute
2250 || (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_FRAGMENT
)))
2251 var
->data
.mode
= ir_var_shader_in
;
2252 else if (qual
->flags
.q
.out
)
2253 var
->data
.mode
= is_parameter
? ir_var_function_out
: ir_var_shader_out
;
2254 else if (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_VERTEX
))
2255 var
->data
.mode
= ir_var_shader_out
;
2256 else if (qual
->flags
.q
.uniform
)
2257 var
->data
.mode
= ir_var_uniform
;
2259 if (!is_parameter
&& is_varying_var(var
, state
->stage
)) {
2260 /* This variable is being used to link data between shader stages (in
2261 * pre-glsl-1.30 parlance, it's a "varying"). Check that it has a type
2262 * that is allowed for such purposes.
2264 * From page 25 (page 31 of the PDF) of the GLSL 1.10 spec:
2266 * "The varying qualifier can be used only with the data types
2267 * float, vec2, vec3, vec4, mat2, mat3, and mat4, or arrays of
2270 * This was relaxed in GLSL version 1.30 and GLSL ES version 3.00. From
2271 * page 31 (page 37 of the PDF) of the GLSL 1.30 spec:
2273 * "Fragment inputs can only be signed and unsigned integers and
2274 * integer vectors, float, floating-point vectors, matrices, or
2275 * arrays of these. Structures cannot be input.
2277 * Similar text exists in the section on vertex shader outputs.
2279 * Similar text exists in the GLSL ES 3.00 spec, except that the GLSL ES
2280 * 3.00 spec allows structs as well. Varying structs are also allowed
2283 switch (var
->type
->get_scalar_type()->base_type
) {
2284 case GLSL_TYPE_FLOAT
:
2285 /* Ok in all GLSL versions */
2287 case GLSL_TYPE_UINT
:
2289 if (state
->is_version(130, 300))
2291 _mesa_glsl_error(loc
, state
,
2292 "varying variables must be of base type float in %s",
2293 state
->get_version_string());
2295 case GLSL_TYPE_STRUCT
:
2296 if (state
->is_version(150, 300))
2298 _mesa_glsl_error(loc
, state
,
2299 "varying variables may not be of type struct");
2302 _mesa_glsl_error(loc
, state
, "illegal type for a varying variable");
2307 if (state
->all_invariant
&& (state
->current_function
== NULL
)) {
2308 switch (state
->stage
) {
2309 case MESA_SHADER_VERTEX
:
2310 if (var
->data
.mode
== ir_var_shader_out
)
2311 var
->data
.invariant
= true;
2313 case MESA_SHADER_GEOMETRY
:
2314 if ((var
->data
.mode
== ir_var_shader_in
)
2315 || (var
->data
.mode
== ir_var_shader_out
))
2316 var
->data
.invariant
= true;
2318 case MESA_SHADER_FRAGMENT
:
2319 if (var
->data
.mode
== ir_var_shader_in
)
2320 var
->data
.invariant
= true;
2325 var
->data
.interpolation
=
2326 interpret_interpolation_qualifier(qual
, (ir_variable_mode
) var
->data
.mode
,
2329 var
->data
.pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
2330 var
->data
.origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
2331 if ((qual
->flags
.q
.origin_upper_left
|| qual
->flags
.q
.pixel_center_integer
)
2332 && (strcmp(var
->name
, "gl_FragCoord") != 0)) {
2333 const char *const qual_string
= (qual
->flags
.q
.origin_upper_left
)
2334 ? "origin_upper_left" : "pixel_center_integer";
2336 _mesa_glsl_error(loc
, state
,
2337 "layout qualifier `%s' can only be applied to "
2338 "fragment shader input `gl_FragCoord'",
2342 if (qual
->flags
.q
.explicit_location
) {
2343 validate_explicit_location(qual
, var
, state
, loc
);
2344 } else if (qual
->flags
.q
.explicit_index
) {
2345 _mesa_glsl_error(loc
, state
,
2346 "explicit index requires explicit location");
2349 if (qual
->flags
.q
.explicit_binding
&&
2350 validate_binding_qualifier(state
, loc
, var
, qual
)) {
2351 var
->data
.explicit_binding
= true;
2352 var
->data
.binding
= qual
->binding
;
2355 if (var
->type
->contains_atomic()) {
2356 if (var
->data
.mode
== ir_var_uniform
) {
2357 if (var
->data
.explicit_binding
) {
2359 &state
->atomic_counter_offsets
[var
->data
.binding
];
2361 if (*offset
% ATOMIC_COUNTER_SIZE
)
2362 _mesa_glsl_error(loc
, state
,
2363 "misaligned atomic counter offset");
2365 var
->data
.atomic
.offset
= *offset
;
2366 *offset
+= var
->type
->atomic_size();
2369 _mesa_glsl_error(loc
, state
,
2370 "atomic counters require explicit binding point");
2372 } else if (var
->data
.mode
!= ir_var_function_in
) {
2373 _mesa_glsl_error(loc
, state
, "atomic counters may only be declared as "
2374 "function parameters or uniform-qualified "
2375 "global variables");
2379 /* Does the declaration use the deprecated 'attribute' or 'varying'
2382 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
2383 || qual
->flags
.q
.varying
;
2385 /* Is the 'layout' keyword used with parameters that allow relaxed checking.
2386 * Many implementations of GL_ARB_fragment_coord_conventions_enable and some
2387 * implementations (only Mesa?) GL_ARB_explicit_attrib_location_enable
2388 * allowed the layout qualifier to be used with 'varying' and 'attribute'.
2389 * These extensions and all following extensions that add the 'layout'
2390 * keyword have been modified to require the use of 'in' or 'out'.
2392 * The following extension do not allow the deprecated keywords:
2394 * GL_AMD_conservative_depth
2395 * GL_ARB_conservative_depth
2396 * GL_ARB_gpu_shader5
2397 * GL_ARB_separate_shader_objects
2398 * GL_ARB_tesselation_shader
2399 * GL_ARB_transform_feedback3
2400 * GL_ARB_uniform_buffer_object
2402 * It is unknown whether GL_EXT_shader_image_load_store or GL_NV_gpu_shader5
2403 * allow layout with the deprecated keywords.
2405 const bool relaxed_layout_qualifier_checking
=
2406 state
->ARB_fragment_coord_conventions_enable
;
2408 if (qual
->has_layout() && uses_deprecated_qualifier
) {
2409 if (relaxed_layout_qualifier_checking
) {
2410 _mesa_glsl_warning(loc
, state
,
2411 "`layout' qualifier may not be used with "
2412 "`attribute' or `varying'");
2414 _mesa_glsl_error(loc
, state
,
2415 "`layout' qualifier may not be used with "
2416 "`attribute' or `varying'");
2420 /* Layout qualifiers for gl_FragDepth, which are enabled by extension
2421 * AMD_conservative_depth.
2423 int depth_layout_count
= qual
->flags
.q
.depth_any
2424 + qual
->flags
.q
.depth_greater
2425 + qual
->flags
.q
.depth_less
2426 + qual
->flags
.q
.depth_unchanged
;
2427 if (depth_layout_count
> 0
2428 && !state
->AMD_conservative_depth_enable
2429 && !state
->ARB_conservative_depth_enable
) {
2430 _mesa_glsl_error(loc
, state
,
2431 "extension GL_AMD_conservative_depth or "
2432 "GL_ARB_conservative_depth must be enabled "
2433 "to use depth layout qualifiers");
2434 } else if (depth_layout_count
> 0
2435 && strcmp(var
->name
, "gl_FragDepth") != 0) {
2436 _mesa_glsl_error(loc
, state
,
2437 "depth layout qualifiers can be applied only to "
2439 } else if (depth_layout_count
> 1
2440 && strcmp(var
->name
, "gl_FragDepth") == 0) {
2441 _mesa_glsl_error(loc
, state
,
2442 "at most one depth layout qualifier can be applied to "
2445 if (qual
->flags
.q
.depth_any
)
2446 var
->data
.depth_layout
= ir_depth_layout_any
;
2447 else if (qual
->flags
.q
.depth_greater
)
2448 var
->data
.depth_layout
= ir_depth_layout_greater
;
2449 else if (qual
->flags
.q
.depth_less
)
2450 var
->data
.depth_layout
= ir_depth_layout_less
;
2451 else if (qual
->flags
.q
.depth_unchanged
)
2452 var
->data
.depth_layout
= ir_depth_layout_unchanged
;
2454 var
->data
.depth_layout
= ir_depth_layout_none
;
2456 if (qual
->flags
.q
.std140
||
2457 qual
->flags
.q
.packed
||
2458 qual
->flags
.q
.shared
) {
2459 _mesa_glsl_error(loc
, state
,
2460 "uniform block layout qualifiers std140, packed, and "
2461 "shared can only be applied to uniform blocks, not "
2465 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
2466 validate_matrix_layout_for_type(state
, loc
, var
->type
, var
);
2471 * Get the variable that is being redeclared by this declaration
2473 * Semantic checks to verify the validity of the redeclaration are also
2474 * performed. If semantic checks fail, compilation error will be emitted via
2475 * \c _mesa_glsl_error, but a non-\c NULL pointer will still be returned.
2478 * A pointer to an existing variable in the current scope if the declaration
2479 * is a redeclaration, \c NULL otherwise.
2481 static ir_variable
*
2482 get_variable_being_redeclared(ir_variable
*var
, YYLTYPE loc
,
2483 struct _mesa_glsl_parse_state
*state
,
2484 bool allow_all_redeclarations
)
2486 /* Check if this declaration is actually a re-declaration, either to
2487 * resize an array or add qualifiers to an existing variable.
2489 * This is allowed for variables in the current scope, or when at
2490 * global scope (for built-ins in the implicit outer scope).
2492 ir_variable
*earlier
= state
->symbols
->get_variable(var
->name
);
2493 if (earlier
== NULL
||
2494 (state
->current_function
!= NULL
&&
2495 !state
->symbols
->name_declared_this_scope(var
->name
))) {
2500 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec,
2502 * "It is legal to declare an array without a size and then
2503 * later re-declare the same name as an array of the same
2504 * type and specify a size."
2506 if (earlier
->type
->is_unsized_array() && var
->type
->is_array()
2507 && (var
->type
->element_type() == earlier
->type
->element_type())) {
2508 /* FINISHME: This doesn't match the qualifiers on the two
2509 * FINISHME: declarations. It's not 100% clear whether this is
2510 * FINISHME: required or not.
2513 const unsigned size
= unsigned(var
->type
->array_size());
2514 check_builtin_array_max_size(var
->name
, size
, loc
, state
);
2515 if ((size
> 0) && (size
<= earlier
->data
.max_array_access
)) {
2516 _mesa_glsl_error(& loc
, state
, "array size must be > %u due to "
2518 earlier
->data
.max_array_access
);
2521 earlier
->type
= var
->type
;
2524 } else if ((state
->ARB_fragment_coord_conventions_enable
||
2525 state
->is_version(150, 0))
2526 && strcmp(var
->name
, "gl_FragCoord") == 0
2527 && earlier
->type
== var
->type
2528 && earlier
->data
.mode
== var
->data
.mode
) {
2529 /* Allow redeclaration of gl_FragCoord for ARB_fcc layout
2532 earlier
->data
.origin_upper_left
= var
->data
.origin_upper_left
;
2533 earlier
->data
.pixel_center_integer
= var
->data
.pixel_center_integer
;
2535 /* According to section 4.3.7 of the GLSL 1.30 spec,
2536 * the following built-in varaibles can be redeclared with an
2537 * interpolation qualifier:
2540 * * gl_FrontSecondaryColor
2541 * * gl_BackSecondaryColor
2543 * * gl_SecondaryColor
2545 } else if (state
->is_version(130, 0)
2546 && (strcmp(var
->name
, "gl_FrontColor") == 0
2547 || strcmp(var
->name
, "gl_BackColor") == 0
2548 || strcmp(var
->name
, "gl_FrontSecondaryColor") == 0
2549 || strcmp(var
->name
, "gl_BackSecondaryColor") == 0
2550 || strcmp(var
->name
, "gl_Color") == 0
2551 || strcmp(var
->name
, "gl_SecondaryColor") == 0)
2552 && earlier
->type
== var
->type
2553 && earlier
->data
.mode
== var
->data
.mode
) {
2554 earlier
->data
.interpolation
= var
->data
.interpolation
;
2556 /* Layout qualifiers for gl_FragDepth. */
2557 } else if ((state
->AMD_conservative_depth_enable
||
2558 state
->ARB_conservative_depth_enable
)
2559 && strcmp(var
->name
, "gl_FragDepth") == 0
2560 && earlier
->type
== var
->type
2561 && earlier
->data
.mode
== var
->data
.mode
) {
2563 /** From the AMD_conservative_depth spec:
2564 * Within any shader, the first redeclarations of gl_FragDepth
2565 * must appear before any use of gl_FragDepth.
2567 if (earlier
->data
.used
) {
2568 _mesa_glsl_error(&loc
, state
,
2569 "the first redeclaration of gl_FragDepth "
2570 "must appear before any use of gl_FragDepth");
2573 /* Prevent inconsistent redeclaration of depth layout qualifier. */
2574 if (earlier
->data
.depth_layout
!= ir_depth_layout_none
2575 && earlier
->data
.depth_layout
!= var
->data
.depth_layout
) {
2576 _mesa_glsl_error(&loc
, state
,
2577 "gl_FragDepth: depth layout is declared here "
2578 "as '%s, but it was previously declared as "
2580 depth_layout_string(var
->data
.depth_layout
),
2581 depth_layout_string(earlier
->data
.depth_layout
));
2584 earlier
->data
.depth_layout
= var
->data
.depth_layout
;
2586 } else if (allow_all_redeclarations
) {
2587 if (earlier
->data
.mode
!= var
->data
.mode
) {
2588 _mesa_glsl_error(&loc
, state
,
2589 "redeclaration of `%s' with incorrect qualifiers",
2591 } else if (earlier
->type
!= var
->type
) {
2592 _mesa_glsl_error(&loc
, state
,
2593 "redeclaration of `%s' has incorrect type",
2597 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", var
->name
);
2604 * Generate the IR for an initializer in a variable declaration
2607 process_initializer(ir_variable
*var
, ast_declaration
*decl
,
2608 ast_fully_specified_type
*type
,
2609 exec_list
*initializer_instructions
,
2610 struct _mesa_glsl_parse_state
*state
)
2612 ir_rvalue
*result
= NULL
;
2614 YYLTYPE initializer_loc
= decl
->initializer
->get_location();
2616 /* From page 24 (page 30 of the PDF) of the GLSL 1.10 spec:
2618 * "All uniform variables are read-only and are initialized either
2619 * directly by an application via API commands, or indirectly by
2622 if (var
->data
.mode
== ir_var_uniform
) {
2623 state
->check_version(120, 0, &initializer_loc
,
2624 "cannot initialize uniforms");
2627 if (var
->type
->is_sampler()) {
2628 _mesa_glsl_error(& initializer_loc
, state
,
2629 "cannot initialize samplers");
2632 if ((var
->data
.mode
== ir_var_shader_in
) && (state
->current_function
== NULL
)) {
2633 _mesa_glsl_error(& initializer_loc
, state
,
2634 "cannot initialize %s shader input / %s",
2635 _mesa_shader_stage_to_string(state
->stage
),
2636 (state
->stage
== MESA_SHADER_VERTEX
)
2637 ? "attribute" : "varying");
2640 /* If the initializer is an ast_aggregate_initializer, recursively store
2641 * type information from the LHS into it, so that its hir() function can do
2644 if (decl
->initializer
->oper
== ast_aggregate
)
2645 _mesa_ast_set_aggregate_type(var
->type
, decl
->initializer
);
2647 ir_dereference
*const lhs
= new(state
) ir_dereference_variable(var
);
2648 ir_rvalue
*rhs
= decl
->initializer
->hir(initializer_instructions
,
2651 /* Calculate the constant value if this is a const or uniform
2654 if (type
->qualifier
.flags
.q
.constant
2655 || type
->qualifier
.flags
.q
.uniform
) {
2656 ir_rvalue
*new_rhs
= validate_assignment(state
, initializer_loc
,
2657 var
->type
, rhs
, true);
2658 if (new_rhs
!= NULL
) {
2661 ir_constant
*constant_value
= rhs
->constant_expression_value();
2662 if (!constant_value
) {
2663 /* If ARB_shading_language_420pack is enabled, initializers of
2664 * const-qualified local variables do not have to be constant
2665 * expressions. Const-qualified global variables must still be
2666 * initialized with constant expressions.
2668 if (!state
->ARB_shading_language_420pack_enable
2669 || state
->current_function
== NULL
) {
2670 _mesa_glsl_error(& initializer_loc
, state
,
2671 "initializer of %s variable `%s' must be a "
2672 "constant expression",
2673 (type
->qualifier
.flags
.q
.constant
)
2674 ? "const" : "uniform",
2676 if (var
->type
->is_numeric()) {
2677 /* Reduce cascading errors. */
2678 var
->constant_value
= ir_constant::zero(state
, var
->type
);
2682 rhs
= constant_value
;
2683 var
->constant_value
= constant_value
;
2686 if (var
->type
->is_numeric()) {
2687 /* Reduce cascading errors. */
2688 var
->constant_value
= ir_constant::zero(state
, var
->type
);
2693 if (rhs
&& !rhs
->type
->is_error()) {
2694 bool temp
= var
->data
.read_only
;
2695 if (type
->qualifier
.flags
.q
.constant
)
2696 var
->data
.read_only
= false;
2698 /* Never emit code to initialize a uniform.
2700 const glsl_type
*initializer_type
;
2701 if (!type
->qualifier
.flags
.q
.uniform
) {
2702 result
= do_assignment(initializer_instructions
, state
,
2705 type
->get_location());
2706 initializer_type
= result
->type
;
2708 initializer_type
= rhs
->type
;
2710 var
->constant_initializer
= rhs
->constant_expression_value();
2711 var
->data
.has_initializer
= true;
2713 /* If the declared variable is an unsized array, it must inherrit
2714 * its full type from the initializer. A declaration such as
2716 * uniform float a[] = float[](1.0, 2.0, 3.0, 3.0);
2720 * uniform float a[4] = float[](1.0, 2.0, 3.0, 3.0);
2722 * The assignment generated in the if-statement (below) will also
2723 * automatically handle this case for non-uniforms.
2725 * If the declared variable is not an array, the types must
2726 * already match exactly. As a result, the type assignment
2727 * here can be done unconditionally. For non-uniforms the call
2728 * to do_assignment can change the type of the initializer (via
2729 * the implicit conversion rules). For uniforms the initializer
2730 * must be a constant expression, and the type of that expression
2731 * was validated above.
2733 var
->type
= initializer_type
;
2735 var
->data
.read_only
= temp
;
2743 * Do additional processing necessary for geometry shader input declarations
2744 * (this covers both interface blocks arrays and bare input variables).
2747 handle_geometry_shader_input_decl(struct _mesa_glsl_parse_state
*state
,
2748 YYLTYPE loc
, ir_variable
*var
)
2750 unsigned num_vertices
= 0;
2751 if (state
->gs_input_prim_type_specified
) {
2752 num_vertices
= vertices_per_prim(state
->gs_input_prim_type
);
2755 /* Geometry shader input variables must be arrays. Caller should have
2756 * reported an error for this.
2758 if (!var
->type
->is_array()) {
2759 assert(state
->error
);
2761 /* To avoid cascading failures, short circuit the checks below. */
2765 if (var
->type
->is_unsized_array()) {
2766 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec says:
2768 * All geometry shader input unsized array declarations will be
2769 * sized by an earlier input layout qualifier, when present, as per
2770 * the following table.
2772 * Followed by a table mapping each allowed input layout qualifier to
2773 * the corresponding input length.
2775 if (num_vertices
!= 0)
2776 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
2779 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec
2780 * includes the following examples of compile-time errors:
2782 * // code sequence within one shader...
2783 * in vec4 Color1[]; // size unknown
2784 * ...Color1.length()...// illegal, length() unknown
2785 * in vec4 Color2[2]; // size is 2
2786 * ...Color1.length()...// illegal, Color1 still has no size
2787 * in vec4 Color3[3]; // illegal, input sizes are inconsistent
2788 * layout(lines) in; // legal, input size is 2, matching
2789 * in vec4 Color4[3]; // illegal, contradicts layout
2792 * To detect the case illustrated by Color3, we verify that the size of
2793 * an explicitly-sized array matches the size of any previously declared
2794 * explicitly-sized array. To detect the case illustrated by Color4, we
2795 * verify that the size of an explicitly-sized array is consistent with
2796 * any previously declared input layout.
2798 if (num_vertices
!= 0 && var
->type
->length
!= num_vertices
) {
2799 _mesa_glsl_error(&loc
, state
,
2800 "geometry shader input size contradicts previously"
2801 " declared layout (size is %u, but layout requires a"
2802 " size of %u)", var
->type
->length
, num_vertices
);
2803 } else if (state
->gs_input_size
!= 0 &&
2804 var
->type
->length
!= state
->gs_input_size
) {
2805 _mesa_glsl_error(&loc
, state
,
2806 "geometry shader input sizes are "
2807 "inconsistent (size is %u, but a previous "
2808 "declaration has size %u)",
2809 var
->type
->length
, state
->gs_input_size
);
2811 state
->gs_input_size
= var
->type
->length
;
2818 validate_identifier(const char *identifier
, YYLTYPE loc
,
2819 struct _mesa_glsl_parse_state
*state
)
2821 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
2823 * "Identifiers starting with "gl_" are reserved for use by
2824 * OpenGL, and may not be declared in a shader as either a
2825 * variable or a function."
2827 if (strncmp(identifier
, "gl_", 3) == 0) {
2828 _mesa_glsl_error(&loc
, state
,
2829 "identifier `%s' uses reserved `gl_' prefix",
2831 } else if (strstr(identifier
, "__")) {
2832 /* From page 14 (page 20 of the PDF) of the GLSL 1.10
2835 * "In addition, all identifiers containing two
2836 * consecutive underscores (__) are reserved as
2837 * possible future keywords."
2839 _mesa_glsl_error(&loc
, state
,
2840 "identifier `%s' uses reserved `__' string",
2847 ast_declarator_list::hir(exec_list
*instructions
,
2848 struct _mesa_glsl_parse_state
*state
)
2851 const struct glsl_type
*decl_type
;
2852 const char *type_name
= NULL
;
2853 ir_rvalue
*result
= NULL
;
2854 YYLTYPE loc
= this->get_location();
2856 /* From page 46 (page 52 of the PDF) of the GLSL 1.50 spec:
2858 * "To ensure that a particular output variable is invariant, it is
2859 * necessary to use the invariant qualifier. It can either be used to
2860 * qualify a previously declared variable as being invariant
2862 * invariant gl_Position; // make existing gl_Position be invariant"
2864 * In these cases the parser will set the 'invariant' flag in the declarator
2865 * list, and the type will be NULL.
2867 if (this->invariant
) {
2868 assert(this->type
== NULL
);
2870 if (state
->current_function
!= NULL
) {
2871 _mesa_glsl_error(& loc
, state
,
2872 "all uses of `invariant' keyword must be at global "
2876 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
2877 assert(decl
->array_specifier
== NULL
);
2878 assert(decl
->initializer
== NULL
);
2880 ir_variable
*const earlier
=
2881 state
->symbols
->get_variable(decl
->identifier
);
2882 if (earlier
== NULL
) {
2883 _mesa_glsl_error(& loc
, state
,
2884 "undeclared variable `%s' cannot be marked "
2885 "invariant", decl
->identifier
);
2886 } else if ((state
->stage
== MESA_SHADER_VERTEX
)
2887 && (earlier
->data
.mode
!= ir_var_shader_out
)) {
2888 _mesa_glsl_error(& loc
, state
,
2889 "`%s' cannot be marked invariant, vertex shader "
2890 "outputs only", decl
->identifier
);
2891 } else if ((state
->stage
== MESA_SHADER_FRAGMENT
)
2892 && (earlier
->data
.mode
!= ir_var_shader_in
)) {
2893 _mesa_glsl_error(& loc
, state
,
2894 "`%s' cannot be marked invariant, fragment shader "
2895 "inputs only", decl
->identifier
);
2896 } else if (earlier
->data
.used
) {
2897 _mesa_glsl_error(& loc
, state
,
2898 "variable `%s' may not be redeclared "
2899 "`invariant' after being used",
2902 earlier
->data
.invariant
= true;
2906 /* Invariant redeclarations do not have r-values.
2911 assert(this->type
!= NULL
);
2912 assert(!this->invariant
);
2914 /* The type specifier may contain a structure definition. Process that
2915 * before any of the variable declarations.
2917 (void) this->type
->specifier
->hir(instructions
, state
);
2919 decl_type
= this->type
->glsl_type(& type_name
, state
);
2921 /* An offset-qualified atomic counter declaration sets the default
2922 * offset for the next declaration within the same atomic counter
2925 if (decl_type
&& decl_type
->contains_atomic()) {
2926 if (type
->qualifier
.flags
.q
.explicit_binding
&&
2927 type
->qualifier
.flags
.q
.explicit_offset
)
2928 state
->atomic_counter_offsets
[type
->qualifier
.binding
] =
2929 type
->qualifier
.offset
;
2932 if (this->declarations
.is_empty()) {
2933 /* If there is no structure involved in the program text, there are two
2934 * possible scenarios:
2936 * - The program text contained something like 'vec4;'. This is an
2937 * empty declaration. It is valid but weird. Emit a warning.
2939 * - The program text contained something like 'S;' and 'S' is not the
2940 * name of a known structure type. This is both invalid and weird.
2943 * - The program text contained something like 'mediump float;'
2944 * when the programmer probably meant 'precision mediump
2945 * float;' Emit a warning with a description of what they
2946 * probably meant to do.
2948 * Note that if decl_type is NULL and there is a structure involved,
2949 * there must have been some sort of error with the structure. In this
2950 * case we assume that an error was already generated on this line of
2951 * code for the structure. There is no need to generate an additional,
2954 assert(this->type
->specifier
->structure
== NULL
|| decl_type
!= NULL
2957 if (decl_type
== NULL
) {
2958 _mesa_glsl_error(&loc
, state
,
2959 "invalid type `%s' in empty declaration",
2961 } else if (decl_type
->base_type
== GLSL_TYPE_ATOMIC_UINT
) {
2962 /* Empty atomic counter declarations are allowed and useful
2963 * to set the default offset qualifier.
2966 } else if (this->type
->qualifier
.precision
!= ast_precision_none
) {
2967 if (this->type
->specifier
->structure
!= NULL
) {
2968 _mesa_glsl_error(&loc
, state
,
2969 "precision qualifiers can't be applied "
2972 static const char *const precision_names
[] = {
2979 _mesa_glsl_warning(&loc
, state
,
2980 "empty declaration with precision qualifier, "
2981 "to set the default precision, use "
2982 "`precision %s %s;'",
2983 precision_names
[this->type
->qualifier
.precision
],
2986 } else if (this->type
->specifier
->structure
== NULL
) {
2987 _mesa_glsl_warning(&loc
, state
, "empty declaration");
2991 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
2992 const struct glsl_type
*var_type
;
2995 /* FINISHME: Emit a warning if a variable declaration shadows a
2996 * FINISHME: declaration at a higher scope.
2999 if ((decl_type
== NULL
) || decl_type
->is_void()) {
3000 if (type_name
!= NULL
) {
3001 _mesa_glsl_error(& loc
, state
,
3002 "invalid type `%s' in declaration of `%s'",
3003 type_name
, decl
->identifier
);
3005 _mesa_glsl_error(& loc
, state
,
3006 "invalid type in declaration of `%s'",
3012 var_type
= process_array_type(&loc
, decl_type
, decl
->array_specifier
,
3015 var
= new(ctx
) ir_variable(var_type
, decl
->identifier
, ir_var_auto
);
3017 /* The 'varying in' and 'varying out' qualifiers can only be used with
3018 * ARB_geometry_shader4 and EXT_geometry_shader4, which we don't support
3021 if (this->type
->qualifier
.flags
.q
.varying
) {
3022 if (this->type
->qualifier
.flags
.q
.in
) {
3023 _mesa_glsl_error(& loc
, state
,
3024 "`varying in' qualifier in declaration of "
3025 "`%s' only valid for geometry shaders using "
3026 "ARB_geometry_shader4 or EXT_geometry_shader4",
3028 } else if (this->type
->qualifier
.flags
.q
.out
) {
3029 _mesa_glsl_error(& loc
, state
,
3030 "`varying out' qualifier in declaration of "
3031 "`%s' only valid for geometry shaders using "
3032 "ARB_geometry_shader4 or EXT_geometry_shader4",
3037 /* From page 22 (page 28 of the PDF) of the GLSL 1.10 specification;
3039 * "Global variables can only use the qualifiers const,
3040 * attribute, uni form, or varying. Only one may be
3043 * Local variables can only use the qualifier const."
3045 * This is relaxed in GLSL 1.30 and GLSL ES 3.00. It is also relaxed by
3046 * any extension that adds the 'layout' keyword.
3048 if (!state
->is_version(130, 300)
3049 && !state
->has_explicit_attrib_location()
3050 && !state
->ARB_fragment_coord_conventions_enable
) {
3051 if (this->type
->qualifier
.flags
.q
.out
) {
3052 _mesa_glsl_error(& loc
, state
,
3053 "`out' qualifier in declaration of `%s' "
3054 "only valid for function parameters in %s",
3055 decl
->identifier
, state
->get_version_string());
3057 if (this->type
->qualifier
.flags
.q
.in
) {
3058 _mesa_glsl_error(& loc
, state
,
3059 "`in' qualifier in declaration of `%s' "
3060 "only valid for function parameters in %s",
3061 decl
->identifier
, state
->get_version_string());
3063 /* FINISHME: Test for other invalid qualifiers. */
3066 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
,
3069 if (this->type
->qualifier
.flags
.q
.invariant
) {
3070 if ((state
->stage
== MESA_SHADER_VERTEX
) &&
3071 var
->data
.mode
!= ir_var_shader_out
) {
3072 _mesa_glsl_error(& loc
, state
,
3073 "`%s' cannot be marked invariant, vertex shader "
3074 "outputs only", var
->name
);
3075 } else if ((state
->stage
== MESA_SHADER_FRAGMENT
) &&
3076 var
->data
.mode
!= ir_var_shader_in
) {
3077 /* FINISHME: Note that this doesn't work for invariant on
3078 * a function signature inval
3080 _mesa_glsl_error(& loc
, state
,
3081 "`%s' cannot be marked invariant, fragment shader "
3082 "inputs only", var
->name
);
3086 if (state
->current_function
!= NULL
) {
3087 const char *mode
= NULL
;
3088 const char *extra
= "";
3090 /* There is no need to check for 'inout' here because the parser will
3091 * only allow that in function parameter lists.
3093 if (this->type
->qualifier
.flags
.q
.attribute
) {
3095 } else if (this->type
->qualifier
.flags
.q
.uniform
) {
3097 } else if (this->type
->qualifier
.flags
.q
.varying
) {
3099 } else if (this->type
->qualifier
.flags
.q
.in
) {
3101 extra
= " or in function parameter list";
3102 } else if (this->type
->qualifier
.flags
.q
.out
) {
3104 extra
= " or in function parameter list";
3108 _mesa_glsl_error(& loc
, state
,
3109 "%s variable `%s' must be declared at "
3111 mode
, var
->name
, extra
);
3113 } else if (var
->data
.mode
== ir_var_shader_in
) {
3114 var
->data
.read_only
= true;
3116 if (state
->stage
== MESA_SHADER_VERTEX
) {
3117 bool error_emitted
= false;
3119 /* From page 31 (page 37 of the PDF) of the GLSL 1.50 spec:
3121 * "Vertex shader inputs can only be float, floating-point
3122 * vectors, matrices, signed and unsigned integers and integer
3123 * vectors. Vertex shader inputs can also form arrays of these
3124 * types, but not structures."
3126 * From page 31 (page 27 of the PDF) of the GLSL 1.30 spec:
3128 * "Vertex shader inputs can only be float, floating-point
3129 * vectors, matrices, signed and unsigned integers and integer
3130 * vectors. They cannot be arrays or structures."
3132 * From page 23 (page 29 of the PDF) of the GLSL 1.20 spec:
3134 * "The attribute qualifier can be used only with float,
3135 * floating-point vectors, and matrices. Attribute variables
3136 * cannot be declared as arrays or structures."
3138 * From page 33 (page 39 of the PDF) of the GLSL ES 3.00 spec:
3140 * "Vertex shader inputs can only be float, floating-point
3141 * vectors, matrices, signed and unsigned integers and integer
3142 * vectors. Vertex shader inputs cannot be arrays or
3145 const glsl_type
*check_type
= var
->type
;
3146 while (check_type
->is_array())
3147 check_type
= check_type
->element_type();
3149 switch (check_type
->base_type
) {
3150 case GLSL_TYPE_FLOAT
:
3152 case GLSL_TYPE_UINT
:
3154 if (state
->is_version(120, 300))
3158 _mesa_glsl_error(& loc
, state
,
3159 "vertex shader input / attribute cannot have "
3161 var
->type
->is_array() ? "array of " : "",
3163 error_emitted
= true;
3166 if (!error_emitted
&& var
->type
->is_array() &&
3167 !state
->check_version(150, 0, &loc
,
3168 "vertex shader input / attribute "
3169 "cannot have array type")) {
3170 error_emitted
= true;
3172 } else if (state
->stage
== MESA_SHADER_GEOMETRY
) {
3173 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
3175 * Geometry shader input variables get the per-vertex values
3176 * written out by vertex shader output variables of the same
3177 * names. Since a geometry shader operates on a set of
3178 * vertices, each input varying variable (or input block, see
3179 * interface blocks below) needs to be declared as an array.
3181 if (!var
->type
->is_array()) {
3182 _mesa_glsl_error(&loc
, state
,
3183 "geometry shader inputs must be arrays");
3186 handle_geometry_shader_input_decl(state
, loc
, var
);
3190 /* Integer fragment inputs must be qualified with 'flat'. In GLSL ES,
3191 * so must integer vertex outputs.
3193 * From section 4.3.4 ("Inputs") of the GLSL 1.50 spec:
3194 * "Fragment shader inputs that are signed or unsigned integers or
3195 * integer vectors must be qualified with the interpolation qualifier
3198 * From section 4.3.4 ("Input Variables") of the GLSL 3.00 ES spec:
3199 * "Fragment shader inputs that are, or contain, signed or unsigned
3200 * integers or integer vectors must be qualified with the
3201 * interpolation qualifier flat."
3203 * From section 4.3.6 ("Output Variables") of the GLSL 3.00 ES spec:
3204 * "Vertex shader outputs that are, or contain, signed or unsigned
3205 * integers or integer vectors must be qualified with the
3206 * interpolation qualifier flat."
3208 * Note that prior to GLSL 1.50, this requirement applied to vertex
3209 * outputs rather than fragment inputs. That creates problems in the
3210 * presence of geometry shaders, so we adopt the GLSL 1.50 rule for all
3211 * desktop GL shaders. For GLSL ES shaders, we follow the spec and
3212 * apply the restriction to both vertex outputs and fragment inputs.
3214 * Note also that the desktop GLSL specs are missing the text "or
3215 * contain"; this is presumably an oversight, since there is no
3216 * reasonable way to interpolate a fragment shader input that contains
3219 if (state
->is_version(130, 300) &&
3220 var
->type
->contains_integer() &&
3221 var
->data
.interpolation
!= INTERP_QUALIFIER_FLAT
&&
3222 ((state
->stage
== MESA_SHADER_FRAGMENT
&& var
->data
.mode
== ir_var_shader_in
)
3223 || (state
->stage
== MESA_SHADER_VERTEX
&& var
->data
.mode
== ir_var_shader_out
3224 && state
->es_shader
))) {
3225 const char *var_type
= (state
->stage
== MESA_SHADER_VERTEX
) ?
3226 "vertex output" : "fragment input";
3227 _mesa_glsl_error(&loc
, state
, "if a %s is (or contains) "
3228 "an integer, then it must be qualified with 'flat'",
3233 /* Interpolation qualifiers cannot be applied to 'centroid' and
3234 * 'centroid varying'.
3236 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
3237 * "interpolation qualifiers may only precede the qualifiers in,
3238 * centroid in, out, or centroid out in a declaration. They do not apply
3239 * to the deprecated storage qualifiers varying or centroid varying."
3241 * These deprecated storage qualifiers do not exist in GLSL ES 3.00.
3243 if (state
->is_version(130, 0)
3244 && this->type
->qualifier
.has_interpolation()
3245 && this->type
->qualifier
.flags
.q
.varying
) {
3247 const char *i
= this->type
->qualifier
.interpolation_string();
3250 if (this->type
->qualifier
.flags
.q
.centroid
)
3251 s
= "centroid varying";
3255 _mesa_glsl_error(&loc
, state
,
3256 "qualifier '%s' cannot be applied to the "
3257 "deprecated storage qualifier '%s'", i
, s
);
3261 /* Interpolation qualifiers can only apply to vertex shader outputs and
3262 * fragment shader inputs.
3264 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
3265 * "Outputs from a vertex shader (out) and inputs to a fragment
3266 * shader (in) can be further qualified with one or more of these
3267 * interpolation qualifiers"
3269 * From page 31 (page 37 of the PDF) of the GLSL ES 3.00 spec:
3270 * "These interpolation qualifiers may only precede the qualifiers
3271 * in, centroid in, out, or centroid out in a declaration. They do
3272 * not apply to inputs into a vertex shader or outputs from a
3275 if (state
->is_version(130, 300)
3276 && this->type
->qualifier
.has_interpolation()) {
3278 const char *i
= this->type
->qualifier
.interpolation_string();
3281 switch (state
->stage
) {
3282 case MESA_SHADER_VERTEX
:
3283 if (this->type
->qualifier
.flags
.q
.in
) {
3284 _mesa_glsl_error(&loc
, state
,
3285 "qualifier '%s' cannot be applied to vertex "
3286 "shader inputs", i
);
3289 case MESA_SHADER_FRAGMENT
:
3290 if (this->type
->qualifier
.flags
.q
.out
) {
3291 _mesa_glsl_error(&loc
, state
,
3292 "qualifier '%s' cannot be applied to fragment "
3293 "shader outputs", i
);
3302 /* From section 4.3.4 of the GLSL 1.30 spec:
3303 * "It is an error to use centroid in in a vertex shader."
3305 * From section 4.3.4 of the GLSL ES 3.00 spec:
3306 * "It is an error to use centroid in or interpolation qualifiers in
3307 * a vertex shader input."
3309 if (state
->is_version(130, 300)
3310 && this->type
->qualifier
.flags
.q
.centroid
3311 && this->type
->qualifier
.flags
.q
.in
3312 && state
->stage
== MESA_SHADER_VERTEX
) {
3314 _mesa_glsl_error(&loc
, state
,
3315 "'centroid in' cannot be used in a vertex shader");
3318 if (state
->stage
== MESA_SHADER_VERTEX
3319 && this->type
->qualifier
.flags
.q
.sample
3320 && this->type
->qualifier
.flags
.q
.in
) {
3322 _mesa_glsl_error(&loc
, state
,
3323 "'sample in' cannot be used in a vertex shader");
3326 /* Section 4.3.6 of the GLSL 1.30 specification states:
3327 * "It is an error to use centroid out in a fragment shader."
3329 * The GL_ARB_shading_language_420pack extension specification states:
3330 * "It is an error to use auxiliary storage qualifiers or interpolation
3331 * qualifiers on an output in a fragment shader."
3333 if (state
->stage
== MESA_SHADER_FRAGMENT
&&
3334 this->type
->qualifier
.flags
.q
.out
&&
3335 this->type
->qualifier
.has_auxiliary_storage()) {
3336 _mesa_glsl_error(&loc
, state
,
3337 "auxiliary storage qualifiers cannot be used on "
3338 "fragment shader outputs");
3341 /* Precision qualifiers exists only in GLSL versions 1.00 and >= 1.30.
3343 if (this->type
->qualifier
.precision
!= ast_precision_none
) {
3344 state
->check_precision_qualifiers_allowed(&loc
);
3348 /* Precision qualifiers apply to floating point, integer and sampler
3351 * Section 4.5.2 (Precision Qualifiers) of the GLSL 1.30 spec says:
3352 * "Any floating point or any integer declaration can have the type
3353 * preceded by one of these precision qualifiers [...] Literal
3354 * constants do not have precision qualifiers. Neither do Boolean
3357 * Section 4.5 (Precision and Precision Qualifiers) of the GLSL 1.30
3360 * "Precision qualifiers are added for code portability with OpenGL
3361 * ES, not for functionality. They have the same syntax as in OpenGL
3364 * Section 8 (Built-In Functions) of the GLSL ES 1.00 spec says:
3366 * "uniform lowp sampler2D sampler;
3369 * lowp vec4 col = texture2D (sampler, coord);
3370 * // texture2D returns lowp"
3372 * From this, we infer that GLSL 1.30 (and later) should allow precision
3373 * qualifiers on sampler types just like float and integer types.
3375 if (this->type
->qualifier
.precision
!= ast_precision_none
3376 && !var
->type
->is_float()
3377 && !var
->type
->is_integer()
3378 && !var
->type
->is_record()
3379 && !var
->type
->is_sampler()
3380 && !(var
->type
->is_array()
3381 && (var
->type
->fields
.array
->is_float()
3382 || var
->type
->fields
.array
->is_integer()))) {
3384 _mesa_glsl_error(&loc
, state
,
3385 "precision qualifiers apply only to floating point"
3386 ", integer and sampler types");
3389 /* From page 17 (page 23 of the PDF) of the GLSL 1.20 spec:
3391 * "[Sampler types] can only be declared as function
3392 * parameters or uniform variables (see Section 4.3.5
3395 if (var_type
->contains_sampler() &&
3396 !this->type
->qualifier
.flags
.q
.uniform
) {
3397 _mesa_glsl_error(&loc
, state
, "samplers must be declared uniform");
3400 /* Process the initializer and add its instructions to a temporary
3401 * list. This list will be added to the instruction stream (below) after
3402 * the declaration is added. This is done because in some cases (such as
3403 * redeclarations) the declaration may not actually be added to the
3404 * instruction stream.
3406 exec_list initializer_instructions
;
3407 ir_variable
*earlier
=
3408 get_variable_being_redeclared(var
, decl
->get_location(), state
,
3409 false /* allow_all_redeclarations */);
3410 if (earlier
!= NULL
) {
3411 if (strncmp(var
->name
, "gl_", 3) == 0 &&
3412 earlier
->data
.how_declared
== ir_var_declared_in_block
) {
3413 _mesa_glsl_error(&loc
, state
,
3414 "`%s' has already been redeclared using "
3415 "gl_PerVertex", var
->name
);
3417 earlier
->data
.how_declared
= ir_var_declared_normally
;
3420 if (decl
->initializer
!= NULL
) {
3421 result
= process_initializer((earlier
== NULL
) ? var
: earlier
,
3423 &initializer_instructions
, state
);
3426 /* From page 23 (page 29 of the PDF) of the GLSL 1.10 spec:
3428 * "It is an error to write to a const variable outside of
3429 * its declaration, so they must be initialized when
3432 if (this->type
->qualifier
.flags
.q
.constant
&& decl
->initializer
== NULL
) {
3433 _mesa_glsl_error(& loc
, state
,
3434 "const declaration of `%s' must be initialized",
3438 if (state
->es_shader
) {
3439 const glsl_type
*const t
= (earlier
== NULL
)
3440 ? var
->type
: earlier
->type
;
3442 if (t
->is_unsized_array())
3443 /* Section 10.17 of the GLSL ES 1.00 specification states that
3444 * unsized array declarations have been removed from the language.
3445 * Arrays that are sized using an initializer are still explicitly
3446 * sized. However, GLSL ES 1.00 does not allow array
3447 * initializers. That is only allowed in GLSL ES 3.00.
3449 * Section 4.1.9 (Arrays) of the GLSL ES 3.00 spec says:
3451 * "An array type can also be formed without specifying a size
3452 * if the definition includes an initializer:
3454 * float x[] = float[2] (1.0, 2.0); // declares an array of size 2
3455 * float y[] = float[] (1.0, 2.0, 3.0); // declares an array of size 3
3460 _mesa_glsl_error(& loc
, state
,
3461 "unsized array declarations are not allowed in "
3465 /* If the declaration is not a redeclaration, there are a few additional
3466 * semantic checks that must be applied. In addition, variable that was
3467 * created for the declaration should be added to the IR stream.
3469 if (earlier
== NULL
) {
3470 validate_identifier(decl
->identifier
, loc
, state
);
3472 /* Add the variable to the symbol table. Note that the initializer's
3473 * IR was already processed earlier (though it hasn't been emitted
3474 * yet), without the variable in scope.
3476 * This differs from most C-like languages, but it follows the GLSL
3477 * specification. From page 28 (page 34 of the PDF) of the GLSL 1.50
3480 * "Within a declaration, the scope of a name starts immediately
3481 * after the initializer if present or immediately after the name
3482 * being declared if not."
3484 if (!state
->symbols
->add_variable(var
)) {
3485 YYLTYPE loc
= this->get_location();
3486 _mesa_glsl_error(&loc
, state
, "name `%s' already taken in the "
3487 "current scope", decl
->identifier
);
3491 /* Push the variable declaration to the top. It means that all the
3492 * variable declarations will appear in a funny last-to-first order,
3493 * but otherwise we run into trouble if a function is prototyped, a
3494 * global var is decled, then the function is defined with usage of
3495 * the global var. See glslparsertest's CorrectModule.frag.
3497 instructions
->push_head(var
);
3500 instructions
->append_list(&initializer_instructions
);
3504 /* Generally, variable declarations do not have r-values. However,
3505 * one is used for the declaration in
3507 * while (bool b = some_condition()) {
3511 * so we return the rvalue from the last seen declaration here.
3518 ast_parameter_declarator::hir(exec_list
*instructions
,
3519 struct _mesa_glsl_parse_state
*state
)
3522 const struct glsl_type
*type
;
3523 const char *name
= NULL
;
3524 YYLTYPE loc
= this->get_location();
3526 type
= this->type
->glsl_type(& name
, state
);
3530 _mesa_glsl_error(& loc
, state
,
3531 "invalid type `%s' in declaration of `%s'",
3532 name
, this->identifier
);
3534 _mesa_glsl_error(& loc
, state
,
3535 "invalid type in declaration of `%s'",
3539 type
= glsl_type::error_type
;
3542 /* From page 62 (page 68 of the PDF) of the GLSL 1.50 spec:
3544 * "Functions that accept no input arguments need not use void in the
3545 * argument list because prototypes (or definitions) are required and
3546 * therefore there is no ambiguity when an empty argument list "( )" is
3547 * declared. The idiom "(void)" as a parameter list is provided for
3550 * Placing this check here prevents a void parameter being set up
3551 * for a function, which avoids tripping up checks for main taking
3552 * parameters and lookups of an unnamed symbol.
3554 if (type
->is_void()) {
3555 if (this->identifier
!= NULL
)
3556 _mesa_glsl_error(& loc
, state
,
3557 "named parameter cannot have type `void'");
3563 if (formal_parameter
&& (this->identifier
== NULL
)) {
3564 _mesa_glsl_error(& loc
, state
, "formal parameter lacks a name");
3568 /* This only handles "vec4 foo[..]". The earlier specifier->glsl_type(...)
3569 * call already handled the "vec4[..] foo" case.
3571 type
= process_array_type(&loc
, type
, this->array_specifier
, state
);
3573 if (!type
->is_error() && type
->is_unsized_array()) {
3574 _mesa_glsl_error(&loc
, state
, "arrays passed as parameters must have "
3576 type
= glsl_type::error_type
;
3580 ir_variable
*var
= new(ctx
)
3581 ir_variable(type
, this->identifier
, ir_var_function_in
);
3583 /* Apply any specified qualifiers to the parameter declaration. Note that
3584 * for function parameters the default mode is 'in'.
3586 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
, & loc
,
3589 /* From page 17 (page 23 of the PDF) of the GLSL 1.20 spec:
3591 * "Samplers cannot be treated as l-values; hence cannot be used
3592 * as out or inout function parameters, nor can they be assigned
3595 if ((var
->data
.mode
== ir_var_function_inout
|| var
->data
.mode
== ir_var_function_out
)
3596 && type
->contains_sampler()) {
3597 _mesa_glsl_error(&loc
, state
, "out and inout parameters cannot contain samplers");
3598 type
= glsl_type::error_type
;
3601 /* From page 39 (page 45 of the PDF) of the GLSL 1.10 spec:
3603 * "When calling a function, expressions that do not evaluate to
3604 * l-values cannot be passed to parameters declared as out or inout."
3606 * From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
3608 * "Other binary or unary expressions, non-dereferenced arrays,
3609 * function names, swizzles with repeated fields, and constants
3610 * cannot be l-values."
3612 * So for GLSL 1.10, passing an array as an out or inout parameter is not
3613 * allowed. This restriction is removed in GLSL 1.20, and in GLSL ES.
3615 if ((var
->data
.mode
== ir_var_function_inout
|| var
->data
.mode
== ir_var_function_out
)
3617 && !state
->check_version(120, 100, &loc
,
3618 "arrays cannot be out or inout parameters")) {
3619 type
= glsl_type::error_type
;
3622 instructions
->push_tail(var
);
3624 /* Parameter declarations do not have r-values.
3631 ast_parameter_declarator::parameters_to_hir(exec_list
*ast_parameters
,
3633 exec_list
*ir_parameters
,
3634 _mesa_glsl_parse_state
*state
)
3636 ast_parameter_declarator
*void_param
= NULL
;
3639 foreach_list_typed (ast_parameter_declarator
, param
, link
, ast_parameters
) {
3640 param
->formal_parameter
= formal
;
3641 param
->hir(ir_parameters
, state
);
3649 if ((void_param
!= NULL
) && (count
> 1)) {
3650 YYLTYPE loc
= void_param
->get_location();
3652 _mesa_glsl_error(& loc
, state
,
3653 "`void' parameter must be only parameter");
3659 emit_function(_mesa_glsl_parse_state
*state
, ir_function
*f
)
3661 /* IR invariants disallow function declarations or definitions
3662 * nested within other function definitions. But there is no
3663 * requirement about the relative order of function declarations
3664 * and definitions with respect to one another. So simply insert
3665 * the new ir_function block at the end of the toplevel instruction
3668 state
->toplevel_ir
->push_tail(f
);
3673 ast_function::hir(exec_list
*instructions
,
3674 struct _mesa_glsl_parse_state
*state
)
3677 ir_function
*f
= NULL
;
3678 ir_function_signature
*sig
= NULL
;
3679 exec_list hir_parameters
;
3681 const char *const name
= identifier
;
3683 /* New functions are always added to the top-level IR instruction stream,
3684 * so this instruction list pointer is ignored. See also emit_function
3687 (void) instructions
;
3689 /* From page 21 (page 27 of the PDF) of the GLSL 1.20 spec,
3691 * "Function declarations (prototypes) cannot occur inside of functions;
3692 * they must be at global scope, or for the built-in functions, outside
3693 * the global scope."
3695 * From page 27 (page 33 of the PDF) of the GLSL ES 1.00.16 spec,
3697 * "User defined functions may only be defined within the global scope."
3699 * Note that this language does not appear in GLSL 1.10.
3701 if ((state
->current_function
!= NULL
) &&
3702 state
->is_version(120, 100)) {
3703 YYLTYPE loc
= this->get_location();
3704 _mesa_glsl_error(&loc
, state
,
3705 "declaration of function `%s' not allowed within "
3706 "function body", name
);
3709 validate_identifier(name
, this->get_location(), state
);
3711 /* Convert the list of function parameters to HIR now so that they can be
3712 * used below to compare this function's signature with previously seen
3713 * signatures for functions with the same name.
3715 ast_parameter_declarator::parameters_to_hir(& this->parameters
,
3717 & hir_parameters
, state
);
3719 const char *return_type_name
;
3720 const glsl_type
*return_type
=
3721 this->return_type
->glsl_type(& return_type_name
, state
);
3724 YYLTYPE loc
= this->get_location();
3725 _mesa_glsl_error(&loc
, state
,
3726 "function `%s' has undeclared return type `%s'",
3727 name
, return_type_name
);
3728 return_type
= glsl_type::error_type
;
3731 /* From page 56 (page 62 of the PDF) of the GLSL 1.30 spec:
3732 * "No qualifier is allowed on the return type of a function."
3734 if (this->return_type
->has_qualifiers()) {
3735 YYLTYPE loc
= this->get_location();
3736 _mesa_glsl_error(& loc
, state
,
3737 "function `%s' return type has qualifiers", name
);
3740 /* Section 6.1 (Function Definitions) of the GLSL 1.20 spec says:
3742 * "Arrays are allowed as arguments and as the return type. In both
3743 * cases, the array must be explicitly sized."
3745 if (return_type
->is_unsized_array()) {
3746 YYLTYPE loc
= this->get_location();
3747 _mesa_glsl_error(& loc
, state
,
3748 "function `%s' return type array must be explicitly "
3752 /* From page 17 (page 23 of the PDF) of the GLSL 1.20 spec:
3754 * "[Sampler types] can only be declared as function parameters
3755 * or uniform variables (see Section 4.3.5 "Uniform")".
3757 if (return_type
->contains_sampler()) {
3758 YYLTYPE loc
= this->get_location();
3759 _mesa_glsl_error(&loc
, state
,
3760 "function `%s' return type can't contain a sampler",
3764 /* Verify that this function's signature either doesn't match a previously
3765 * seen signature for a function with the same name, or, if a match is found,
3766 * that the previously seen signature does not have an associated definition.
3768 f
= state
->symbols
->get_function(name
);
3769 if (f
!= NULL
&& (state
->es_shader
|| f
->has_user_signature())) {
3770 sig
= f
->exact_matching_signature(state
, &hir_parameters
);
3772 const char *badvar
= sig
->qualifiers_match(&hir_parameters
);
3773 if (badvar
!= NULL
) {
3774 YYLTYPE loc
= this->get_location();
3776 _mesa_glsl_error(&loc
, state
, "function `%s' parameter `%s' "
3777 "qualifiers don't match prototype", name
, badvar
);
3780 if (sig
->return_type
!= return_type
) {
3781 YYLTYPE loc
= this->get_location();
3783 _mesa_glsl_error(&loc
, state
, "function `%s' return type doesn't "
3784 "match prototype", name
);
3787 if (sig
->is_defined
) {
3788 if (is_definition
) {
3789 YYLTYPE loc
= this->get_location();
3790 _mesa_glsl_error(& loc
, state
, "function `%s' redefined", name
);
3792 /* We just encountered a prototype that exactly matches a
3793 * function that's already been defined. This is redundant,
3794 * and we should ignore it.
3801 f
= new(ctx
) ir_function(name
);
3802 if (!state
->symbols
->add_function(f
)) {
3803 /* This function name shadows a non-function use of the same name. */
3804 YYLTYPE loc
= this->get_location();
3806 _mesa_glsl_error(&loc
, state
, "function name `%s' conflicts with "
3807 "non-function", name
);
3811 emit_function(state
, f
);
3814 /* Verify the return type of main() */
3815 if (strcmp(name
, "main") == 0) {
3816 if (! return_type
->is_void()) {
3817 YYLTYPE loc
= this->get_location();
3819 _mesa_glsl_error(& loc
, state
, "main() must return void");
3822 if (!hir_parameters
.is_empty()) {
3823 YYLTYPE loc
= this->get_location();
3825 _mesa_glsl_error(& loc
, state
, "main() must not take any parameters");
3829 /* Finish storing the information about this new function in its signature.
3832 sig
= new(ctx
) ir_function_signature(return_type
);
3833 f
->add_signature(sig
);
3836 sig
->replace_parameters(&hir_parameters
);
3839 /* Function declarations (prototypes) do not have r-values.
3846 ast_function_definition::hir(exec_list
*instructions
,
3847 struct _mesa_glsl_parse_state
*state
)
3849 prototype
->is_definition
= true;
3850 prototype
->hir(instructions
, state
);
3852 ir_function_signature
*signature
= prototype
->signature
;
3853 if (signature
== NULL
)
3856 assert(state
->current_function
== NULL
);
3857 state
->current_function
= signature
;
3858 state
->found_return
= false;
3860 /* Duplicate parameters declared in the prototype as concrete variables.
3861 * Add these to the symbol table.
3863 state
->symbols
->push_scope();
3864 foreach_list(n
, &signature
->parameters
) {
3865 ir_variable
*const var
= ((ir_instruction
*) n
)->as_variable();
3867 assert(var
!= NULL
);
3869 /* The only way a parameter would "exist" is if two parameters have
3872 if (state
->symbols
->name_declared_this_scope(var
->name
)) {
3873 YYLTYPE loc
= this->get_location();
3875 _mesa_glsl_error(& loc
, state
, "parameter `%s' redeclared", var
->name
);
3877 state
->symbols
->add_variable(var
);
3881 /* Convert the body of the function to HIR. */
3882 this->body
->hir(&signature
->body
, state
);
3883 signature
->is_defined
= true;
3885 state
->symbols
->pop_scope();
3887 assert(state
->current_function
== signature
);
3888 state
->current_function
= NULL
;
3890 if (!signature
->return_type
->is_void() && !state
->found_return
) {
3891 YYLTYPE loc
= this->get_location();
3892 _mesa_glsl_error(& loc
, state
, "function `%s' has non-void return type "
3893 "%s, but no return statement",
3894 signature
->function_name(),
3895 signature
->return_type
->name
);
3898 /* Function definitions do not have r-values.
3905 ast_jump_statement::hir(exec_list
*instructions
,
3906 struct _mesa_glsl_parse_state
*state
)
3913 assert(state
->current_function
);
3915 if (opt_return_value
) {
3916 ir_rvalue
*ret
= opt_return_value
->hir(instructions
, state
);
3918 /* The value of the return type can be NULL if the shader says
3919 * 'return foo();' and foo() is a function that returns void.
3921 * NOTE: The GLSL spec doesn't say that this is an error. The type
3922 * of the return value is void. If the return type of the function is
3923 * also void, then this should compile without error. Seriously.
3925 const glsl_type
*const ret_type
=
3926 (ret
== NULL
) ? glsl_type::void_type
: ret
->type
;
3928 /* Implicit conversions are not allowed for return values prior to
3929 * ARB_shading_language_420pack.
3931 if (state
->current_function
->return_type
!= ret_type
) {
3932 YYLTYPE loc
= this->get_location();
3934 if (state
->ARB_shading_language_420pack_enable
) {
3935 if (!apply_implicit_conversion(state
->current_function
->return_type
,
3937 _mesa_glsl_error(& loc
, state
,
3938 "could not implicitly convert return value "
3939 "to %s, in function `%s'",
3940 state
->current_function
->return_type
->name
,
3941 state
->current_function
->function_name());
3944 _mesa_glsl_error(& loc
, state
,
3945 "`return' with wrong type %s, in function `%s' "
3948 state
->current_function
->function_name(),
3949 state
->current_function
->return_type
->name
);
3951 } else if (state
->current_function
->return_type
->base_type
==
3953 YYLTYPE loc
= this->get_location();
3955 /* The ARB_shading_language_420pack, GLSL ES 3.0, and GLSL 4.20
3956 * specs add a clarification:
3958 * "A void function can only use return without a return argument, even if
3959 * the return argument has void type. Return statements only accept values:
3962 * void func2() { return func1(); } // illegal return statement"
3964 _mesa_glsl_error(& loc
, state
,
3965 "void functions can only use `return' without a "
3969 inst
= new(ctx
) ir_return(ret
);
3971 if (state
->current_function
->return_type
->base_type
!=
3973 YYLTYPE loc
= this->get_location();
3975 _mesa_glsl_error(& loc
, state
,
3976 "`return' with no value, in function %s returning "
3978 state
->current_function
->function_name());
3980 inst
= new(ctx
) ir_return
;
3983 state
->found_return
= true;
3984 instructions
->push_tail(inst
);
3989 if (state
->stage
!= MESA_SHADER_FRAGMENT
) {
3990 YYLTYPE loc
= this->get_location();
3992 _mesa_glsl_error(& loc
, state
,
3993 "`discard' may only appear in a fragment shader");
3995 instructions
->push_tail(new(ctx
) ir_discard
);
4000 if (mode
== ast_continue
&&
4001 state
->loop_nesting_ast
== NULL
) {
4002 YYLTYPE loc
= this->get_location();
4004 _mesa_glsl_error(& loc
, state
,
4005 "continue may only appear in a loop");
4006 } else if (mode
== ast_break
&&
4007 state
->loop_nesting_ast
== NULL
&&
4008 state
->switch_state
.switch_nesting_ast
== NULL
) {
4009 YYLTYPE loc
= this->get_location();
4011 _mesa_glsl_error(& loc
, state
,
4012 "break may only appear in a loop or a switch");
4014 /* For a loop, inline the for loop expression again,
4015 * since we don't know where near the end of
4016 * the loop body the normal copy of it
4017 * is going to be placed.
4019 if (state
->loop_nesting_ast
!= NULL
&&
4020 mode
== ast_continue
&&
4021 state
->loop_nesting_ast
->rest_expression
) {
4022 state
->loop_nesting_ast
->rest_expression
->hir(instructions
,
4026 if (state
->switch_state
.is_switch_innermost
&&
4027 mode
== ast_break
) {
4028 /* Force break out of switch by setting is_break switch state.
4030 ir_variable
*const is_break_var
= state
->switch_state
.is_break_var
;
4031 ir_dereference_variable
*const deref_is_break_var
=
4032 new(ctx
) ir_dereference_variable(is_break_var
);
4033 ir_constant
*const true_val
= new(ctx
) ir_constant(true);
4034 ir_assignment
*const set_break_var
=
4035 new(ctx
) ir_assignment(deref_is_break_var
, true_val
);
4037 instructions
->push_tail(set_break_var
);
4040 ir_loop_jump
*const jump
=
4041 new(ctx
) ir_loop_jump((mode
== ast_break
)
4042 ? ir_loop_jump::jump_break
4043 : ir_loop_jump::jump_continue
);
4044 instructions
->push_tail(jump
);
4051 /* Jump instructions do not have r-values.
4058 ast_selection_statement::hir(exec_list
*instructions
,
4059 struct _mesa_glsl_parse_state
*state
)
4063 ir_rvalue
*const condition
= this->condition
->hir(instructions
, state
);
4065 /* From page 66 (page 72 of the PDF) of the GLSL 1.50 spec:
4067 * "Any expression whose type evaluates to a Boolean can be used as the
4068 * conditional expression bool-expression. Vector types are not accepted
4069 * as the expression to if."
4071 * The checks are separated so that higher quality diagnostics can be
4072 * generated for cases where both rules are violated.
4074 if (!condition
->type
->is_boolean() || !condition
->type
->is_scalar()) {
4075 YYLTYPE loc
= this->condition
->get_location();
4077 _mesa_glsl_error(& loc
, state
, "if-statement condition must be scalar "
4081 ir_if
*const stmt
= new(ctx
) ir_if(condition
);
4083 if (then_statement
!= NULL
) {
4084 state
->symbols
->push_scope();
4085 then_statement
->hir(& stmt
->then_instructions
, state
);
4086 state
->symbols
->pop_scope();
4089 if (else_statement
!= NULL
) {
4090 state
->symbols
->push_scope();
4091 else_statement
->hir(& stmt
->else_instructions
, state
);
4092 state
->symbols
->pop_scope();
4095 instructions
->push_tail(stmt
);
4097 /* if-statements do not have r-values.
4104 ast_switch_statement::hir(exec_list
*instructions
,
4105 struct _mesa_glsl_parse_state
*state
)
4109 ir_rvalue
*const test_expression
=
4110 this->test_expression
->hir(instructions
, state
);
4112 /* From page 66 (page 55 of the PDF) of the GLSL 1.50 spec:
4114 * "The type of init-expression in a switch statement must be a
4117 if (!test_expression
->type
->is_scalar() ||
4118 !test_expression
->type
->is_integer()) {
4119 YYLTYPE loc
= this->test_expression
->get_location();
4121 _mesa_glsl_error(& loc
,
4123 "switch-statement expression must be scalar "
4127 /* Track the switch-statement nesting in a stack-like manner.
4129 struct glsl_switch_state saved
= state
->switch_state
;
4131 state
->switch_state
.is_switch_innermost
= true;
4132 state
->switch_state
.switch_nesting_ast
= this;
4133 state
->switch_state
.labels_ht
= hash_table_ctor(0, hash_table_pointer_hash
,
4134 hash_table_pointer_compare
);
4135 state
->switch_state
.previous_default
= NULL
;
4137 /* Initalize is_fallthru state to false.
4139 ir_rvalue
*const is_fallthru_val
= new (ctx
) ir_constant(false);
4140 state
->switch_state
.is_fallthru_var
=
4141 new(ctx
) ir_variable(glsl_type::bool_type
,
4142 "switch_is_fallthru_tmp",
4144 instructions
->push_tail(state
->switch_state
.is_fallthru_var
);
4146 ir_dereference_variable
*deref_is_fallthru_var
=
4147 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
4148 instructions
->push_tail(new(ctx
) ir_assignment(deref_is_fallthru_var
,
4151 /* Initalize is_break state to false.
4153 ir_rvalue
*const is_break_val
= new (ctx
) ir_constant(false);
4154 state
->switch_state
.is_break_var
= new(ctx
) ir_variable(glsl_type::bool_type
,
4155 "switch_is_break_tmp",
4157 instructions
->push_tail(state
->switch_state
.is_break_var
);
4159 ir_dereference_variable
*deref_is_break_var
=
4160 new(ctx
) ir_dereference_variable(state
->switch_state
.is_break_var
);
4161 instructions
->push_tail(new(ctx
) ir_assignment(deref_is_break_var
,
4164 /* Cache test expression.
4166 test_to_hir(instructions
, state
);
4168 /* Emit code for body of switch stmt.
4170 body
->hir(instructions
, state
);
4172 hash_table_dtor(state
->switch_state
.labels_ht
);
4174 state
->switch_state
= saved
;
4176 /* Switch statements do not have r-values. */
4182 ast_switch_statement::test_to_hir(exec_list
*instructions
,
4183 struct _mesa_glsl_parse_state
*state
)
4187 /* Cache value of test expression. */
4188 ir_rvalue
*const test_val
=
4189 test_expression
->hir(instructions
,
4192 state
->switch_state
.test_var
= new(ctx
) ir_variable(test_val
->type
,
4195 ir_dereference_variable
*deref_test_var
=
4196 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
4198 instructions
->push_tail(state
->switch_state
.test_var
);
4199 instructions
->push_tail(new(ctx
) ir_assignment(deref_test_var
, test_val
));
4204 ast_switch_body::hir(exec_list
*instructions
,
4205 struct _mesa_glsl_parse_state
*state
)
4208 stmts
->hir(instructions
, state
);
4210 /* Switch bodies do not have r-values. */
4215 ast_case_statement_list::hir(exec_list
*instructions
,
4216 struct _mesa_glsl_parse_state
*state
)
4218 foreach_list_typed (ast_case_statement
, case_stmt
, link
, & this->cases
)
4219 case_stmt
->hir(instructions
, state
);
4221 /* Case statements do not have r-values. */
4226 ast_case_statement::hir(exec_list
*instructions
,
4227 struct _mesa_glsl_parse_state
*state
)
4229 labels
->hir(instructions
, state
);
4231 /* Conditionally set fallthru state based on break state. */
4232 ir_constant
*const false_val
= new(state
) ir_constant(false);
4233 ir_dereference_variable
*const deref_is_fallthru_var
=
4234 new(state
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
4235 ir_dereference_variable
*const deref_is_break_var
=
4236 new(state
) ir_dereference_variable(state
->switch_state
.is_break_var
);
4237 ir_assignment
*const reset_fallthru_on_break
=
4238 new(state
) ir_assignment(deref_is_fallthru_var
,
4240 deref_is_break_var
);
4241 instructions
->push_tail(reset_fallthru_on_break
);
4243 /* Guard case statements depending on fallthru state. */
4244 ir_dereference_variable
*const deref_fallthru_guard
=
4245 new(state
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
4246 ir_if
*const test_fallthru
= new(state
) ir_if(deref_fallthru_guard
);
4248 foreach_list_typed (ast_node
, stmt
, link
, & this->stmts
)
4249 stmt
->hir(& test_fallthru
->then_instructions
, state
);
4251 instructions
->push_tail(test_fallthru
);
4253 /* Case statements do not have r-values. */
4259 ast_case_label_list::hir(exec_list
*instructions
,
4260 struct _mesa_glsl_parse_state
*state
)
4262 foreach_list_typed (ast_case_label
, label
, link
, & this->labels
)
4263 label
->hir(instructions
, state
);
4265 /* Case labels do not have r-values. */
4270 ast_case_label::hir(exec_list
*instructions
,
4271 struct _mesa_glsl_parse_state
*state
)
4275 ir_dereference_variable
*deref_fallthru_var
=
4276 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
4278 ir_rvalue
*const true_val
= new(ctx
) ir_constant(true);
4280 /* If not default case, ... */
4281 if (this->test_value
!= NULL
) {
4282 /* Conditionally set fallthru state based on
4283 * comparison of cached test expression value to case label.
4285 ir_rvalue
*const label_rval
= this->test_value
->hir(instructions
, state
);
4286 ir_constant
*label_const
= label_rval
->constant_expression_value();
4289 YYLTYPE loc
= this->test_value
->get_location();
4291 _mesa_glsl_error(& loc
, state
,
4292 "switch statement case label must be a "
4293 "constant expression");
4295 /* Stuff a dummy value in to allow processing to continue. */
4296 label_const
= new(ctx
) ir_constant(0);
4298 ast_expression
*previous_label
= (ast_expression
*)
4299 hash_table_find(state
->switch_state
.labels_ht
,
4300 (void *)(uintptr_t)label_const
->value
.u
[0]);
4302 if (previous_label
) {
4303 YYLTYPE loc
= this->test_value
->get_location();
4304 _mesa_glsl_error(& loc
, state
,
4305 "duplicate case value");
4307 loc
= previous_label
->get_location();
4308 _mesa_glsl_error(& loc
, state
,
4309 "this is the previous case label");
4311 hash_table_insert(state
->switch_state
.labels_ht
,
4313 (void *)(uintptr_t)label_const
->value
.u
[0]);
4317 ir_dereference_variable
*deref_test_var
=
4318 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
4320 ir_rvalue
*const test_cond
= new(ctx
) ir_expression(ir_binop_all_equal
,
4324 ir_assignment
*set_fallthru_on_test
=
4325 new(ctx
) ir_assignment(deref_fallthru_var
,
4329 instructions
->push_tail(set_fallthru_on_test
);
4330 } else { /* default case */
4331 if (state
->switch_state
.previous_default
) {
4332 YYLTYPE loc
= this->get_location();
4333 _mesa_glsl_error(& loc
, state
,
4334 "multiple default labels in one switch");
4336 loc
= state
->switch_state
.previous_default
->get_location();
4337 _mesa_glsl_error(& loc
, state
,
4338 "this is the first default label");
4340 state
->switch_state
.previous_default
= this;
4342 /* Set falltrhu state. */
4343 ir_assignment
*set_fallthru
=
4344 new(ctx
) ir_assignment(deref_fallthru_var
, true_val
);
4346 instructions
->push_tail(set_fallthru
);
4349 /* Case statements do not have r-values. */
4354 ast_iteration_statement::condition_to_hir(ir_loop
*stmt
,
4355 struct _mesa_glsl_parse_state
*state
)
4359 if (condition
!= NULL
) {
4360 ir_rvalue
*const cond
=
4361 condition
->hir(& stmt
->body_instructions
, state
);
4364 || !cond
->type
->is_boolean() || !cond
->type
->is_scalar()) {
4365 YYLTYPE loc
= condition
->get_location();
4367 _mesa_glsl_error(& loc
, state
,
4368 "loop condition must be scalar boolean");
4370 /* As the first code in the loop body, generate a block that looks
4371 * like 'if (!condition) break;' as the loop termination condition.
4373 ir_rvalue
*const not_cond
=
4374 new(ctx
) ir_expression(ir_unop_logic_not
, cond
);
4376 ir_if
*const if_stmt
= new(ctx
) ir_if(not_cond
);
4378 ir_jump
*const break_stmt
=
4379 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
4381 if_stmt
->then_instructions
.push_tail(break_stmt
);
4382 stmt
->body_instructions
.push_tail(if_stmt
);
4389 ast_iteration_statement::hir(exec_list
*instructions
,
4390 struct _mesa_glsl_parse_state
*state
)
4394 /* For-loops and while-loops start a new scope, but do-while loops do not.
4396 if (mode
!= ast_do_while
)
4397 state
->symbols
->push_scope();
4399 if (init_statement
!= NULL
)
4400 init_statement
->hir(instructions
, state
);
4402 ir_loop
*const stmt
= new(ctx
) ir_loop();
4403 instructions
->push_tail(stmt
);
4405 /* Track the current loop nesting. */
4406 ast_iteration_statement
*nesting_ast
= state
->loop_nesting_ast
;
4408 state
->loop_nesting_ast
= this;
4410 /* Likewise, indicate that following code is closest to a loop,
4411 * NOT closest to a switch.
4413 bool saved_is_switch_innermost
= state
->switch_state
.is_switch_innermost
;
4414 state
->switch_state
.is_switch_innermost
= false;
4416 if (mode
!= ast_do_while
)
4417 condition_to_hir(stmt
, state
);
4420 body
->hir(& stmt
->body_instructions
, state
);
4422 if (rest_expression
!= NULL
)
4423 rest_expression
->hir(& stmt
->body_instructions
, state
);
4425 if (mode
== ast_do_while
)
4426 condition_to_hir(stmt
, state
);
4428 if (mode
!= ast_do_while
)
4429 state
->symbols
->pop_scope();
4431 /* Restore previous nesting before returning. */
4432 state
->loop_nesting_ast
= nesting_ast
;
4433 state
->switch_state
.is_switch_innermost
= saved_is_switch_innermost
;
4435 /* Loops do not have r-values.
4442 * Determine if the given type is valid for establishing a default precision
4445 * From GLSL ES 3.00 section 4.5.4 ("Default Precision Qualifiers"):
4447 * "The precision statement
4449 * precision precision-qualifier type;
4451 * can be used to establish a default precision qualifier. The type field
4452 * can be either int or float or any of the sampler types, and the
4453 * precision-qualifier can be lowp, mediump, or highp."
4455 * GLSL ES 1.00 has similar language. GLSL 1.30 doesn't allow precision
4456 * qualifiers on sampler types, but this seems like an oversight (since the
4457 * intention of including these in GLSL 1.30 is to allow compatibility with ES
4458 * shaders). So we allow int, float, and all sampler types regardless of GLSL
4462 is_valid_default_precision_type(const struct glsl_type
*const type
)
4467 switch (type
->base_type
) {
4469 case GLSL_TYPE_FLOAT
:
4470 /* "int" and "float" are valid, but vectors and matrices are not. */
4471 return type
->vector_elements
== 1 && type
->matrix_columns
== 1;
4472 case GLSL_TYPE_SAMPLER
:
4481 ast_type_specifier::hir(exec_list
*instructions
,
4482 struct _mesa_glsl_parse_state
*state
)
4484 if (this->default_precision
== ast_precision_none
&& this->structure
== NULL
)
4487 YYLTYPE loc
= this->get_location();
4489 /* If this is a precision statement, check that the type to which it is
4490 * applied is either float or int.
4492 * From section 4.5.3 of the GLSL 1.30 spec:
4493 * "The precision statement
4494 * precision precision-qualifier type;
4495 * can be used to establish a default precision qualifier. The type
4496 * field can be either int or float [...]. Any other types or
4497 * qualifiers will result in an error.
4499 if (this->default_precision
!= ast_precision_none
) {
4500 if (!state
->check_precision_qualifiers_allowed(&loc
))
4503 if (this->structure
!= NULL
) {
4504 _mesa_glsl_error(&loc
, state
,
4505 "precision qualifiers do not apply to structures");
4509 if (this->array_specifier
!= NULL
) {
4510 _mesa_glsl_error(&loc
, state
,
4511 "default precision statements do not apply to "
4516 const struct glsl_type
*const type
=
4517 state
->symbols
->get_type(this->type_name
);
4518 if (!is_valid_default_precision_type(type
)) {
4519 _mesa_glsl_error(&loc
, state
,
4520 "default precision statements apply only to "
4521 "float, int, and sampler types");
4525 if (type
->base_type
== GLSL_TYPE_FLOAT
4527 && state
->stage
== MESA_SHADER_FRAGMENT
) {
4528 /* Section 4.5.3 (Default Precision Qualifiers) of the GLSL ES 1.00
4531 * "The fragment language has no default precision qualifier for
4532 * floating point types."
4534 * As a result, we have to track whether or not default precision has
4535 * been specified for float in GLSL ES fragment shaders.
4537 * Earlier in that same section, the spec says:
4539 * "Non-precision qualified declarations will use the precision
4540 * qualifier specified in the most recent precision statement
4541 * that is still in scope. The precision statement has the same
4542 * scoping rules as variable declarations. If it is declared
4543 * inside a compound statement, its effect stops at the end of
4544 * the innermost statement it was declared in. Precision
4545 * statements in nested scopes override precision statements in
4546 * outer scopes. Multiple precision statements for the same basic
4547 * type can appear inside the same scope, with later statements
4548 * overriding earlier statements within that scope."
4550 * Default precision specifications follow the same scope rules as
4551 * variables. So, we can track the state of the default float
4552 * precision in the symbol table, and the rules will just work. This
4553 * is a slight abuse of the symbol table, but it has the semantics
4556 ir_variable
*const junk
=
4557 new(state
) ir_variable(type
, "#default precision",
4560 state
->symbols
->add_variable(junk
);
4563 /* FINISHME: Translate precision statements into IR. */
4567 /* _mesa_ast_set_aggregate_type() sets the <structure> field so that
4568 * process_record_constructor() can do type-checking on C-style initializer
4569 * expressions of structs, but ast_struct_specifier should only be translated
4570 * to HIR if it is declaring the type of a structure.
4572 * The ->is_declaration field is false for initializers of variables
4573 * declared separately from the struct's type definition.
4575 * struct S { ... }; (is_declaration = true)
4576 * struct T { ... } t = { ... }; (is_declaration = true)
4577 * S s = { ... }; (is_declaration = false)
4579 if (this->structure
!= NULL
&& this->structure
->is_declaration
)
4580 return this->structure
->hir(instructions
, state
);
4587 * Process a structure or interface block tree into an array of structure fields
4589 * After parsing, where there are some syntax differnces, structures and
4590 * interface blocks are almost identical. They are similar enough that the
4591 * AST for each can be processed the same way into a set of
4592 * \c glsl_struct_field to describe the members.
4594 * If we're processing an interface block, var_mode should be the type of the
4595 * interface block (ir_var_shader_in, ir_var_shader_out, or ir_var_uniform).
4596 * If we're processing a structure, var_mode should be ir_var_auto.
4599 * The number of fields processed. A pointer to the array structure fields is
4600 * stored in \c *fields_ret.
4603 ast_process_structure_or_interface_block(exec_list
*instructions
,
4604 struct _mesa_glsl_parse_state
*state
,
4605 exec_list
*declarations
,
4607 glsl_struct_field
**fields_ret
,
4609 bool block_row_major
,
4610 bool allow_reserved_names
,
4611 ir_variable_mode var_mode
)
4613 unsigned decl_count
= 0;
4615 /* Make an initial pass over the list of fields to determine how
4616 * many there are. Each element in this list is an ast_declarator_list.
4617 * This means that we actually need to count the number of elements in the
4618 * 'declarations' list in each of the elements.
4620 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
4621 foreach_list_const (decl_ptr
, & decl_list
->declarations
) {
4626 /* Allocate storage for the fields and process the field
4627 * declarations. As the declarations are processed, try to also convert
4628 * the types to HIR. This ensures that structure definitions embedded in
4629 * other structure definitions or in interface blocks are processed.
4631 glsl_struct_field
*const fields
= ralloc_array(state
, glsl_struct_field
,
4635 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
4636 const char *type_name
;
4638 decl_list
->type
->specifier
->hir(instructions
, state
);
4640 /* Section 10.9 of the GLSL ES 1.00 specification states that
4641 * embedded structure definitions have been removed from the language.
4643 if (state
->es_shader
&& decl_list
->type
->specifier
->structure
!= NULL
) {
4644 _mesa_glsl_error(&loc
, state
, "embedded structure definitions are "
4645 "not allowed in GLSL ES 1.00");
4648 const glsl_type
*decl_type
=
4649 decl_list
->type
->glsl_type(& type_name
, state
);
4651 foreach_list_typed (ast_declaration
, decl
, link
,
4652 &decl_list
->declarations
) {
4653 if (!allow_reserved_names
)
4654 validate_identifier(decl
->identifier
, loc
, state
);
4656 /* From the GL_ARB_uniform_buffer_object spec:
4658 * "Sampler types are not allowed inside of uniform
4659 * blocks. All other types, arrays, and structures
4660 * allowed for uniforms are allowed within a uniform
4663 * It should be impossible for decl_type to be NULL here. Cases that
4664 * might naturally lead to decl_type being NULL, especially for the
4665 * is_interface case, will have resulted in compilation having
4666 * already halted due to a syntax error.
4668 const struct glsl_type
*field_type
=
4669 decl_type
!= NULL
? decl_type
: glsl_type::error_type
;
4671 if (is_interface
&& field_type
->contains_sampler()) {
4672 YYLTYPE loc
= decl_list
->get_location();
4673 _mesa_glsl_error(&loc
, state
,
4674 "uniform in non-default uniform block contains sampler");
4677 if (field_type
->contains_atomic()) {
4678 /* FINISHME: Add a spec quotation here once updated spec
4679 * FINISHME: language is available. See Khronos bug #10903
4680 * FINISHME: on whether atomic counters are allowed in
4681 * FINISHME: structures.
4683 YYLTYPE loc
= decl_list
->get_location();
4684 _mesa_glsl_error(&loc
, state
, "atomic counter in structure or "
4688 const struct ast_type_qualifier
*const qual
=
4689 & decl_list
->type
->qualifier
;
4690 if (qual
->flags
.q
.std140
||
4691 qual
->flags
.q
.packed
||
4692 qual
->flags
.q
.shared
) {
4693 _mesa_glsl_error(&loc
, state
,
4694 "uniform block layout qualifiers std140, packed, and "
4695 "shared can only be applied to uniform blocks, not "
4699 field_type
= process_array_type(&loc
, decl_type
,
4700 decl
->array_specifier
, state
);
4701 fields
[i
].type
= field_type
;
4702 fields
[i
].name
= decl
->identifier
;
4703 fields
[i
].location
= -1;
4704 fields
[i
].interpolation
=
4705 interpret_interpolation_qualifier(qual
, var_mode
, state
, &loc
);
4706 fields
[i
].centroid
= qual
->flags
.q
.centroid
? 1 : 0;
4707 fields
[i
].sample
= qual
->flags
.q
.sample
? 1 : 0;
4709 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
4710 if (!qual
->flags
.q
.uniform
) {
4711 _mesa_glsl_error(&loc
, state
,
4712 "row_major and column_major can only be "
4713 "applied to uniform interface blocks");
4715 validate_matrix_layout_for_type(state
, &loc
, field_type
, NULL
);
4718 if (qual
->flags
.q
.uniform
&& qual
->has_interpolation()) {
4719 _mesa_glsl_error(&loc
, state
,
4720 "interpolation qualifiers cannot be used "
4721 "with uniform interface blocks");
4724 if (field_type
->is_matrix() ||
4725 (field_type
->is_array() && field_type
->fields
.array
->is_matrix())) {
4726 fields
[i
].row_major
= block_row_major
;
4727 if (qual
->flags
.q
.row_major
)
4728 fields
[i
].row_major
= true;
4729 else if (qual
->flags
.q
.column_major
)
4730 fields
[i
].row_major
= false;
4737 assert(i
== decl_count
);
4739 *fields_ret
= fields
;
4745 ast_struct_specifier::hir(exec_list
*instructions
,
4746 struct _mesa_glsl_parse_state
*state
)
4748 YYLTYPE loc
= this->get_location();
4750 /* Section 4.1.8 (Structures) of the GLSL 1.10 spec says:
4752 * "Anonymous structures are not supported; so embedded structures must
4753 * have a declarator. A name given to an embedded struct is scoped at
4754 * the same level as the struct it is embedded in."
4756 * The same section of the GLSL 1.20 spec says:
4758 * "Anonymous structures are not supported. Embedded structures are not
4761 * struct S { float f; };
4763 * S; // Error: anonymous structures disallowed
4764 * struct { ... }; // Error: embedded structures disallowed
4765 * S s; // Okay: nested structures with name are allowed
4768 * The GLSL ES 1.00 and 3.00 specs have similar langauge and examples. So,
4769 * we allow embedded structures in 1.10 only.
4771 if (state
->language_version
!= 110 && state
->struct_specifier_depth
!= 0)
4772 _mesa_glsl_error(&loc
, state
,
4773 "embedded structure declartions are not allowed");
4775 state
->struct_specifier_depth
++;
4777 glsl_struct_field
*fields
;
4778 unsigned decl_count
=
4779 ast_process_structure_or_interface_block(instructions
,
4781 &this->declarations
,
4786 false /* allow_reserved_names */,
4789 validate_identifier(this->name
, loc
, state
);
4791 const glsl_type
*t
=
4792 glsl_type::get_record_instance(fields
, decl_count
, this->name
);
4794 if (!state
->symbols
->add_type(name
, t
)) {
4795 _mesa_glsl_error(& loc
, state
, "struct `%s' previously defined", name
);
4797 const glsl_type
**s
= reralloc(state
, state
->user_structures
,
4799 state
->num_user_structures
+ 1);
4801 s
[state
->num_user_structures
] = t
;
4802 state
->user_structures
= s
;
4803 state
->num_user_structures
++;
4807 state
->struct_specifier_depth
--;
4809 /* Structure type definitions do not have r-values.
4816 * Visitor class which detects whether a given interface block has been used.
4818 class interface_block_usage_visitor
: public ir_hierarchical_visitor
4821 interface_block_usage_visitor(ir_variable_mode mode
, const glsl_type
*block
)
4822 : mode(mode
), block(block
), found(false)
4826 virtual ir_visitor_status
visit(ir_dereference_variable
*ir
)
4828 if (ir
->var
->data
.mode
== mode
&& ir
->var
->get_interface_type() == block
) {
4832 return visit_continue
;
4835 bool usage_found() const
4841 ir_variable_mode mode
;
4842 const glsl_type
*block
;
4848 ast_interface_block::hir(exec_list
*instructions
,
4849 struct _mesa_glsl_parse_state
*state
)
4851 YYLTYPE loc
= this->get_location();
4853 /* The ast_interface_block has a list of ast_declarator_lists. We
4854 * need to turn those into ir_variables with an association
4855 * with this uniform block.
4857 enum glsl_interface_packing packing
;
4858 if (this->layout
.flags
.q
.shared
) {
4859 packing
= GLSL_INTERFACE_PACKING_SHARED
;
4860 } else if (this->layout
.flags
.q
.packed
) {
4861 packing
= GLSL_INTERFACE_PACKING_PACKED
;
4863 /* The default layout is std140.
4865 packing
= GLSL_INTERFACE_PACKING_STD140
;
4868 ir_variable_mode var_mode
;
4869 const char *iface_type_name
;
4870 if (this->layout
.flags
.q
.in
) {
4871 var_mode
= ir_var_shader_in
;
4872 iface_type_name
= "in";
4873 } else if (this->layout
.flags
.q
.out
) {
4874 var_mode
= ir_var_shader_out
;
4875 iface_type_name
= "out";
4876 } else if (this->layout
.flags
.q
.uniform
) {
4877 var_mode
= ir_var_uniform
;
4878 iface_type_name
= "uniform";
4880 var_mode
= ir_var_auto
;
4881 iface_type_name
= "UNKNOWN";
4882 assert(!"interface block layout qualifier not found!");
4885 bool redeclaring_per_vertex
= strcmp(this->block_name
, "gl_PerVertex") == 0;
4886 bool block_row_major
= this->layout
.flags
.q
.row_major
;
4887 exec_list declared_variables
;
4888 glsl_struct_field
*fields
;
4889 unsigned int num_variables
=
4890 ast_process_structure_or_interface_block(&declared_variables
,
4892 &this->declarations
,
4897 redeclaring_per_vertex
,
4900 if (!redeclaring_per_vertex
)
4901 validate_identifier(this->block_name
, loc
, state
);
4903 const glsl_type
*earlier_per_vertex
= NULL
;
4904 if (redeclaring_per_vertex
) {
4905 /* Find the previous declaration of gl_PerVertex. If we're redeclaring
4906 * the named interface block gl_in, we can find it by looking at the
4907 * previous declaration of gl_in. Otherwise we can find it by looking
4908 * at the previous decalartion of any of the built-in outputs,
4911 * Also check that the instance name and array-ness of the redeclaration
4915 case ir_var_shader_in
:
4916 if (ir_variable
*earlier_gl_in
=
4917 state
->symbols
->get_variable("gl_in")) {
4918 earlier_per_vertex
= earlier_gl_in
->get_interface_type();
4920 _mesa_glsl_error(&loc
, state
,
4921 "redeclaration of gl_PerVertex input not allowed "
4923 _mesa_shader_stage_to_string(state
->stage
));
4925 if (this->instance_name
== NULL
||
4926 strcmp(this->instance_name
, "gl_in") != 0 || this->array_specifier
== NULL
) {
4927 _mesa_glsl_error(&loc
, state
,
4928 "gl_PerVertex input must be redeclared as "
4932 case ir_var_shader_out
:
4933 if (ir_variable
*earlier_gl_Position
=
4934 state
->symbols
->get_variable("gl_Position")) {
4935 earlier_per_vertex
= earlier_gl_Position
->get_interface_type();
4937 _mesa_glsl_error(&loc
, state
,
4938 "redeclaration of gl_PerVertex output not "
4939 "allowed in the %s shader",
4940 _mesa_shader_stage_to_string(state
->stage
));
4942 if (this->instance_name
!= NULL
) {
4943 _mesa_glsl_error(&loc
, state
,
4944 "gl_PerVertex input may not be redeclared with "
4945 "an instance name");
4949 _mesa_glsl_error(&loc
, state
,
4950 "gl_PerVertex must be declared as an input or an "
4955 if (earlier_per_vertex
== NULL
) {
4956 /* An error has already been reported. Bail out to avoid null
4957 * dereferences later in this function.
4962 /* Copy locations from the old gl_PerVertex interface block. */
4963 for (unsigned i
= 0; i
< num_variables
; i
++) {
4964 int j
= earlier_per_vertex
->field_index(fields
[i
].name
);
4966 _mesa_glsl_error(&loc
, state
,
4967 "redeclaration of gl_PerVertex must be a subset "
4968 "of the built-in members of gl_PerVertex");
4970 fields
[i
].location
=
4971 earlier_per_vertex
->fields
.structure
[j
].location
;
4972 fields
[i
].interpolation
=
4973 earlier_per_vertex
->fields
.structure
[j
].interpolation
;
4974 fields
[i
].centroid
=
4975 earlier_per_vertex
->fields
.structure
[j
].centroid
;
4977 earlier_per_vertex
->fields
.structure
[j
].sample
;
4981 /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10
4984 * If a built-in interface block is redeclared, it must appear in
4985 * the shader before any use of any member included in the built-in
4986 * declaration, or a compilation error will result.
4988 * This appears to be a clarification to the behaviour established for
4989 * gl_PerVertex by GLSL 1.50, therefore we implement this behaviour
4990 * regardless of GLSL version.
4992 interface_block_usage_visitor
v(var_mode
, earlier_per_vertex
);
4993 v
.run(instructions
);
4994 if (v
.usage_found()) {
4995 _mesa_glsl_error(&loc
, state
,
4996 "redeclaration of a built-in interface block must "
4997 "appear before any use of any member of the "
5002 const glsl_type
*block_type
=
5003 glsl_type::get_interface_instance(fields
,
5008 if (!state
->symbols
->add_interface(block_type
->name
, block_type
, var_mode
)) {
5009 YYLTYPE loc
= this->get_location();
5010 _mesa_glsl_error(&loc
, state
, "interface block `%s' with type `%s' "
5011 "already taken in the current scope",
5012 this->block_name
, iface_type_name
);
5015 /* Since interface blocks cannot contain statements, it should be
5016 * impossible for the block to generate any instructions.
5018 assert(declared_variables
.is_empty());
5020 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
5022 * Geometry shader input variables get the per-vertex values written
5023 * out by vertex shader output variables of the same names. Since a
5024 * geometry shader operates on a set of vertices, each input varying
5025 * variable (or input block, see interface blocks below) needs to be
5026 * declared as an array.
5028 if (state
->stage
== MESA_SHADER_GEOMETRY
&& this->array_specifier
== NULL
&&
5029 var_mode
== ir_var_shader_in
) {
5030 _mesa_glsl_error(&loc
, state
, "geometry shader inputs must be arrays");
5033 /* Page 39 (page 45 of the PDF) of section 4.3.7 in the GLSL ES 3.00 spec
5036 * "If an instance name (instance-name) is used, then it puts all the
5037 * members inside a scope within its own name space, accessed with the
5038 * field selector ( . ) operator (analogously to structures)."
5040 if (this->instance_name
) {
5041 if (redeclaring_per_vertex
) {
5042 /* When a built-in in an unnamed interface block is redeclared,
5043 * get_variable_being_redeclared() calls
5044 * check_builtin_array_max_size() to make sure that built-in array
5045 * variables aren't redeclared to illegal sizes. But we're looking
5046 * at a redeclaration of a named built-in interface block. So we
5047 * have to manually call check_builtin_array_max_size() for all parts
5048 * of the interface that are arrays.
5050 for (unsigned i
= 0; i
< num_variables
; i
++) {
5051 if (fields
[i
].type
->is_array()) {
5052 const unsigned size
= fields
[i
].type
->array_size();
5053 check_builtin_array_max_size(fields
[i
].name
, size
, loc
, state
);
5057 validate_identifier(this->instance_name
, loc
, state
);
5062 if (this->array_specifier
!= NULL
) {
5063 /* Section 4.3.7 (Interface Blocks) of the GLSL 1.50 spec says:
5065 * For uniform blocks declared an array, each individual array
5066 * element corresponds to a separate buffer object backing one
5067 * instance of the block. As the array size indicates the number
5068 * of buffer objects needed, uniform block array declarations
5069 * must specify an array size.
5071 * And a few paragraphs later:
5073 * Geometry shader input blocks must be declared as arrays and
5074 * follow the array declaration and linking rules for all
5075 * geometry shader inputs. All other input and output block
5076 * arrays must specify an array size.
5078 * The upshot of this is that the only circumstance where an
5079 * interface array size *doesn't* need to be specified is on a
5080 * geometry shader input.
5082 if (this->array_specifier
->is_unsized_array
&&
5083 (state
->stage
!= MESA_SHADER_GEOMETRY
|| !this->layout
.flags
.q
.in
)) {
5084 _mesa_glsl_error(&loc
, state
,
5085 "only geometry shader inputs may be unsized "
5086 "instance block arrays");
5090 const glsl_type
*block_array_type
=
5091 process_array_type(&loc
, block_type
, this->array_specifier
, state
);
5093 var
= new(state
) ir_variable(block_array_type
,
5094 this->instance_name
,
5097 var
= new(state
) ir_variable(block_type
,
5098 this->instance_name
,
5102 if (state
->stage
== MESA_SHADER_GEOMETRY
&& var_mode
== ir_var_shader_in
)
5103 handle_geometry_shader_input_decl(state
, loc
, var
);
5105 if (ir_variable
*earlier
=
5106 state
->symbols
->get_variable(this->instance_name
)) {
5107 if (!redeclaring_per_vertex
) {
5108 _mesa_glsl_error(&loc
, state
, "`%s' redeclared",
5109 this->instance_name
);
5111 earlier
->data
.how_declared
= ir_var_declared_normally
;
5112 earlier
->type
= var
->type
;
5113 earlier
->reinit_interface_type(block_type
);
5116 state
->symbols
->add_variable(var
);
5117 instructions
->push_tail(var
);
5120 /* In order to have an array size, the block must also be declared with
5123 assert(this->array_specifier
== NULL
);
5125 for (unsigned i
= 0; i
< num_variables
; i
++) {
5127 new(state
) ir_variable(fields
[i
].type
,
5128 ralloc_strdup(state
, fields
[i
].name
),
5130 var
->data
.interpolation
= fields
[i
].interpolation
;
5131 var
->data
.centroid
= fields
[i
].centroid
;
5132 var
->data
.sample
= fields
[i
].sample
;
5133 var
->init_interface_type(block_type
);
5135 if (redeclaring_per_vertex
) {
5136 ir_variable
*earlier
=
5137 get_variable_being_redeclared(var
, loc
, state
,
5138 true /* allow_all_redeclarations */);
5139 if (strncmp(var
->name
, "gl_", 3) != 0 || earlier
== NULL
) {
5140 _mesa_glsl_error(&loc
, state
,
5141 "redeclaration of gl_PerVertex can only "
5142 "include built-in variables");
5143 } else if (earlier
->data
.how_declared
== ir_var_declared_normally
) {
5144 _mesa_glsl_error(&loc
, state
,
5145 "`%s' has already been redeclared", var
->name
);
5147 earlier
->data
.how_declared
= ir_var_declared_in_block
;
5148 earlier
->reinit_interface_type(block_type
);
5153 if (state
->symbols
->get_variable(var
->name
) != NULL
)
5154 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", var
->name
);
5156 /* Propagate the "binding" keyword into this UBO's fields;
5157 * the UBO declaration itself doesn't get an ir_variable unless it
5158 * has an instance name. This is ugly.
5160 var
->data
.explicit_binding
= this->layout
.flags
.q
.explicit_binding
;
5161 var
->data
.binding
= this->layout
.binding
;
5163 state
->symbols
->add_variable(var
);
5164 instructions
->push_tail(var
);
5167 if (redeclaring_per_vertex
&& block_type
!= earlier_per_vertex
) {
5168 /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10 spec:
5170 * It is also a compilation error ... to redeclare a built-in
5171 * block and then use a member from that built-in block that was
5172 * not included in the redeclaration.
5174 * This appears to be a clarification to the behaviour established
5175 * for gl_PerVertex by GLSL 1.50, therefore we implement this
5176 * behaviour regardless of GLSL version.
5178 * To prevent the shader from using a member that was not included in
5179 * the redeclaration, we disable any ir_variables that are still
5180 * associated with the old declaration of gl_PerVertex (since we've
5181 * already updated all of the variables contained in the new
5182 * gl_PerVertex to point to it).
5184 * As a side effect this will prevent
5185 * validate_intrastage_interface_blocks() from getting confused and
5186 * thinking there are conflicting definitions of gl_PerVertex in the
5189 foreach_list_safe(node
, instructions
) {
5190 ir_variable
*const var
= ((ir_instruction
*) node
)->as_variable();
5192 var
->get_interface_type() == earlier_per_vertex
&&
5193 var
->data
.mode
== var_mode
) {
5194 if (var
->data
.how_declared
== ir_var_declared_normally
) {
5195 _mesa_glsl_error(&loc
, state
,
5196 "redeclaration of gl_PerVertex cannot "
5197 "follow a redeclaration of `%s'",
5200 state
->symbols
->disable_variable(var
->name
);
5212 ast_gs_input_layout::hir(exec_list
*instructions
,
5213 struct _mesa_glsl_parse_state
*state
)
5215 YYLTYPE loc
= this->get_location();
5217 /* If any geometry input layout declaration preceded this one, make sure it
5218 * was consistent with this one.
5220 if (state
->gs_input_prim_type_specified
&&
5221 state
->gs_input_prim_type
!= this->prim_type
) {
5222 _mesa_glsl_error(&loc
, state
,
5223 "geometry shader input layout does not match"
5224 " previous declaration");
5228 /* If any shader inputs occurred before this declaration and specified an
5229 * array size, make sure the size they specified is consistent with the
5232 unsigned num_vertices
= vertices_per_prim(this->prim_type
);
5233 if (state
->gs_input_size
!= 0 && state
->gs_input_size
!= num_vertices
) {
5234 _mesa_glsl_error(&loc
, state
,
5235 "this geometry shader input layout implies %u vertices"
5236 " per primitive, but a previous input is declared"
5237 " with size %u", num_vertices
, state
->gs_input_size
);
5241 state
->gs_input_prim_type_specified
= true;
5242 state
->gs_input_prim_type
= this->prim_type
;
5244 /* If any shader inputs occurred before this declaration and did not
5245 * specify an array size, their size is determined now.
5247 foreach_list (node
, instructions
) {
5248 ir_variable
*var
= ((ir_instruction
*) node
)->as_variable();
5249 if (var
== NULL
|| var
->data
.mode
!= ir_var_shader_in
)
5252 /* Note: gl_PrimitiveIDIn has mode ir_var_shader_in, but it's not an
5256 if (var
->type
->is_unsized_array()) {
5257 if (var
->data
.max_array_access
>= num_vertices
) {
5258 _mesa_glsl_error(&loc
, state
,
5259 "this geometry shader input layout implies %u"
5260 " vertices, but an access to element %u of input"
5261 " `%s' already exists", num_vertices
,
5262 var
->data
.max_array_access
, var
->name
);
5264 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
5275 detect_conflicting_assignments(struct _mesa_glsl_parse_state
*state
,
5276 exec_list
*instructions
)
5278 bool gl_FragColor_assigned
= false;
5279 bool gl_FragData_assigned
= false;
5280 bool user_defined_fs_output_assigned
= false;
5281 ir_variable
*user_defined_fs_output
= NULL
;
5283 /* It would be nice to have proper location information. */
5285 memset(&loc
, 0, sizeof(loc
));
5287 foreach_list(node
, instructions
) {
5288 ir_variable
*var
= ((ir_instruction
*)node
)->as_variable();
5290 if (!var
|| !var
->data
.assigned
)
5293 if (strcmp(var
->name
, "gl_FragColor") == 0)
5294 gl_FragColor_assigned
= true;
5295 else if (strcmp(var
->name
, "gl_FragData") == 0)
5296 gl_FragData_assigned
= true;
5297 else if (strncmp(var
->name
, "gl_", 3) != 0) {
5298 if (state
->stage
== MESA_SHADER_FRAGMENT
&&
5299 var
->data
.mode
== ir_var_shader_out
) {
5300 user_defined_fs_output_assigned
= true;
5301 user_defined_fs_output
= var
;
5306 /* From the GLSL 1.30 spec:
5308 * "If a shader statically assigns a value to gl_FragColor, it
5309 * may not assign a value to any element of gl_FragData. If a
5310 * shader statically writes a value to any element of
5311 * gl_FragData, it may not assign a value to
5312 * gl_FragColor. That is, a shader may assign values to either
5313 * gl_FragColor or gl_FragData, but not both. Multiple shaders
5314 * linked together must also consistently write just one of
5315 * these variables. Similarly, if user declared output
5316 * variables are in use (statically assigned to), then the
5317 * built-in variables gl_FragColor and gl_FragData may not be
5318 * assigned to. These incorrect usages all generate compile
5321 if (gl_FragColor_assigned
&& gl_FragData_assigned
) {
5322 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
5323 "`gl_FragColor' and `gl_FragData'");
5324 } else if (gl_FragColor_assigned
&& user_defined_fs_output_assigned
) {
5325 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
5326 "`gl_FragColor' and `%s'",
5327 user_defined_fs_output
->name
);
5328 } else if (gl_FragData_assigned
&& user_defined_fs_output_assigned
) {
5329 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
5330 "`gl_FragData' and `%s'",
5331 user_defined_fs_output
->name
);
5337 remove_per_vertex_blocks(exec_list
*instructions
,
5338 _mesa_glsl_parse_state
*state
, ir_variable_mode mode
)
5340 /* Find the gl_PerVertex interface block of the appropriate (in/out) mode,
5341 * if it exists in this shader type.
5343 const glsl_type
*per_vertex
= NULL
;
5345 case ir_var_shader_in
:
5346 if (ir_variable
*gl_in
= state
->symbols
->get_variable("gl_in"))
5347 per_vertex
= gl_in
->get_interface_type();
5349 case ir_var_shader_out
:
5350 if (ir_variable
*gl_Position
=
5351 state
->symbols
->get_variable("gl_Position")) {
5352 per_vertex
= gl_Position
->get_interface_type();
5356 assert(!"Unexpected mode");
5360 /* If we didn't find a built-in gl_PerVertex interface block, then we don't
5361 * need to do anything.
5363 if (per_vertex
== NULL
)
5366 /* If the interface block is used by the shader, then we don't need to do
5369 interface_block_usage_visitor
v(mode
, per_vertex
);
5370 v
.run(instructions
);
5371 if (v
.usage_found())
5374 /* Remove any ir_variable declarations that refer to the interface block
5377 foreach_list_safe(node
, instructions
) {
5378 ir_variable
*const var
= ((ir_instruction
*) node
)->as_variable();
5379 if (var
!= NULL
&& var
->get_interface_type() == per_vertex
&&
5380 var
->data
.mode
== mode
) {
5381 state
->symbols
->disable_variable(var
->name
);