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/imports.h"
53 #include "main/extensions.h"
54 #include "glsl_symbol_table.h"
55 #include "glsl_parser_extras.h"
57 #include "glsl_types.h"
61 _mesa_ast_to_hir(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
)
63 _mesa_glsl_initialize_variables(instructions
, state
);
64 _mesa_glsl_initialize_functions(instructions
, state
);
66 state
->current_function
= NULL
;
68 foreach_list_typed (ast_node
, ast
, link
, & state
->translation_unit
)
69 ast
->hir(instructions
, state
);
74 * If a conversion is available, convert one operand to a different type
76 * The \c from \c ir_rvalue is converted "in place".
78 * \param to Type that the operand it to be converted to
79 * \param from Operand that is being converted
80 * \param state GLSL compiler state
83 * If a conversion is possible (or unnecessary), \c true is returned.
84 * Otherwise \c false is returned.
87 apply_implicit_conversion(const glsl_type
*to
, ir_rvalue
* &from
,
88 struct _mesa_glsl_parse_state
*state
)
91 if (to
->base_type
== from
->type
->base_type
)
94 /* This conversion was added in GLSL 1.20. If the compilation mode is
95 * GLSL 1.10, the conversion is skipped.
97 if (state
->language_version
< 120)
100 /* From page 27 (page 33 of the PDF) of the GLSL 1.50 spec:
102 * "There are no implicit array or structure conversions. For
103 * example, an array of int cannot be implicitly converted to an
104 * array of float. There are no implicit conversions between
105 * signed and unsigned integers."
107 /* FINISHME: The above comment is partially a lie. There is int/uint
108 * FINISHME: conversion for immediate constants.
110 if (!to
->is_float() || !from
->type
->is_numeric())
113 /* Convert to a floating point type with the same number of components
114 * as the original type - i.e. int to float, not int to vec4.
116 to
= glsl_type::get_instance(GLSL_TYPE_FLOAT
, from
->type
->vector_elements
,
117 from
->type
->matrix_columns
);
119 switch (from
->type
->base_type
) {
121 from
= new(ctx
) ir_expression(ir_unop_i2f
, to
, from
, NULL
);
124 from
= new(ctx
) ir_expression(ir_unop_u2f
, to
, from
, NULL
);
127 from
= new(ctx
) ir_expression(ir_unop_b2f
, to
, from
, NULL
);
137 static const struct glsl_type
*
138 arithmetic_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
140 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
142 const glsl_type
*type_a
= value_a
->type
;
143 const glsl_type
*type_b
= value_b
->type
;
145 /* From GLSL 1.50 spec, page 56:
147 * "The arithmetic binary operators add (+), subtract (-),
148 * multiply (*), and divide (/) operate on integer and
149 * floating-point scalars, vectors, and matrices."
151 if (!type_a
->is_numeric() || !type_b
->is_numeric()) {
152 _mesa_glsl_error(loc
, state
,
153 "Operands to arithmetic operators must be numeric");
154 return glsl_type::error_type
;
158 /* "If one operand is floating-point based and the other is
159 * not, then the conversions from Section 4.1.10 "Implicit
160 * Conversions" are applied to the non-floating-point-based operand."
162 if (!apply_implicit_conversion(type_a
, value_b
, state
)
163 && !apply_implicit_conversion(type_b
, value_a
, state
)) {
164 _mesa_glsl_error(loc
, state
,
165 "Could not implicitly convert operands to "
166 "arithmetic operator");
167 return glsl_type::error_type
;
169 type_a
= value_a
->type
;
170 type_b
= value_b
->type
;
172 /* "If the operands are integer types, they must both be signed or
175 * From this rule and the preceeding conversion it can be inferred that
176 * both types must be GLSL_TYPE_FLOAT, or GLSL_TYPE_UINT, or GLSL_TYPE_INT.
177 * The is_numeric check above already filtered out the case where either
178 * type is not one of these, so now the base types need only be tested for
181 if (type_a
->base_type
!= type_b
->base_type
) {
182 _mesa_glsl_error(loc
, state
,
183 "base type mismatch for arithmetic operator");
184 return glsl_type::error_type
;
187 /* "All arithmetic binary operators result in the same fundamental type
188 * (signed integer, unsigned integer, or floating-point) as the
189 * operands they operate on, after operand type conversion. After
190 * conversion, the following cases are valid
192 * * The two operands are scalars. In this case the operation is
193 * applied, resulting in a scalar."
195 if (type_a
->is_scalar() && type_b
->is_scalar())
198 /* "* One operand is a scalar, and the other is a vector or matrix.
199 * In this case, the scalar operation is applied independently to each
200 * component of the vector or matrix, resulting in the same size
203 if (type_a
->is_scalar()) {
204 if (!type_b
->is_scalar())
206 } else if (type_b
->is_scalar()) {
210 /* All of the combinations of <scalar, scalar>, <vector, scalar>,
211 * <scalar, vector>, <scalar, matrix>, and <matrix, scalar> have been
214 assert(!type_a
->is_scalar());
215 assert(!type_b
->is_scalar());
217 /* "* The two operands are vectors of the same size. In this case, the
218 * operation is done component-wise resulting in the same size
221 if (type_a
->is_vector() && type_b
->is_vector()) {
222 if (type_a
== type_b
) {
225 _mesa_glsl_error(loc
, state
,
226 "vector size mismatch for arithmetic operator");
227 return glsl_type::error_type
;
231 /* All of the combinations of <scalar, scalar>, <vector, scalar>,
232 * <scalar, vector>, <scalar, matrix>, <matrix, scalar>, and
233 * <vector, vector> have been handled. At least one of the operands must
234 * be matrix. Further, since there are no integer matrix types, the base
235 * type of both operands must be float.
237 assert(type_a
->is_matrix() || type_b
->is_matrix());
238 assert(type_a
->base_type
== GLSL_TYPE_FLOAT
);
239 assert(type_b
->base_type
== GLSL_TYPE_FLOAT
);
241 /* "* The operator is add (+), subtract (-), or divide (/), and the
242 * operands are matrices with the same number of rows and the same
243 * number of columns. In this case, the operation is done component-
244 * wise resulting in the same size matrix."
245 * * The operator is multiply (*), where both operands are matrices or
246 * one operand is a vector and the other a matrix. A right vector
247 * operand is treated as a column vector and a left vector operand as a
248 * row vector. In all these cases, it is required that the number of
249 * columns of the left operand is equal to the number of rows of the
250 * right operand. Then, the multiply (*) operation does a linear
251 * algebraic multiply, yielding an object that has the same number of
252 * rows as the left operand and the same number of columns as the right
253 * operand. Section 5.10 "Vector and Matrix Operations" explains in
254 * more detail how vectors and matrices are operated on."
257 if (type_a
== type_b
)
260 if (type_a
->is_matrix() && type_b
->is_matrix()) {
261 /* Matrix multiply. The columns of A must match the rows of B. Given
262 * the other previously tested constraints, this means the vector type
263 * of a row from A must be the same as the vector type of a column from
266 if (type_a
->row_type() == type_b
->column_type()) {
267 /* The resulting matrix has the number of columns of matrix B and
268 * the number of rows of matrix A. We get the row count of A by
269 * looking at the size of a vector that makes up a column. The
270 * transpose (size of a row) is done for B.
272 const glsl_type
*const type
=
273 glsl_type::get_instance(type_a
->base_type
,
274 type_a
->column_type()->vector_elements
,
275 type_b
->row_type()->vector_elements
);
276 assert(type
!= glsl_type::error_type
);
280 } else if (type_a
->is_matrix()) {
281 /* A is a matrix and B is a column vector. Columns of A must match
282 * rows of B. Given the other previously tested constraints, this
283 * means the vector type of a row from A must be the same as the
284 * vector the type of B.
286 if (type_a
->row_type() == type_b
) {
287 /* The resulting vector has a number of elements equal to
288 * the number of rows of matrix A. */
289 const glsl_type
*const type
=
290 glsl_type::get_instance(type_a
->base_type
,
291 type_a
->column_type()->vector_elements
,
293 assert(type
!= glsl_type::error_type
);
298 assert(type_b
->is_matrix());
300 /* A is a row vector and B is a matrix. Columns of A must match rows
301 * of B. Given the other previously tested constraints, this means
302 * the type of A must be the same as the vector type of a column from
305 if (type_a
== type_b
->column_type()) {
306 /* The resulting vector has a number of elements equal to
307 * the number of columns of matrix B. */
308 const glsl_type
*const type
=
309 glsl_type::get_instance(type_a
->base_type
,
310 type_b
->row_type()->vector_elements
,
312 assert(type
!= glsl_type::error_type
);
318 _mesa_glsl_error(loc
, state
, "size mismatch for matrix multiplication");
319 return glsl_type::error_type
;
323 /* "All other cases are illegal."
325 _mesa_glsl_error(loc
, state
, "type mismatch");
326 return glsl_type::error_type
;
330 static const struct glsl_type
*
331 unary_arithmetic_result_type(const struct glsl_type
*type
,
332 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
334 /* From GLSL 1.50 spec, page 57:
336 * "The arithmetic unary operators negate (-), post- and pre-increment
337 * and decrement (-- and ++) operate on integer or floating-point
338 * values (including vectors and matrices). All unary operators work
339 * component-wise on their operands. These result with the same type
342 if (!type
->is_numeric()) {
343 _mesa_glsl_error(loc
, state
,
344 "Operands to arithmetic operators must be numeric");
345 return glsl_type::error_type
;
352 static const struct glsl_type
*
353 modulus_result_type(const struct glsl_type
*type_a
,
354 const struct glsl_type
*type_b
,
355 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
357 /* From GLSL 1.50 spec, page 56:
358 * "The operator modulus (%) operates on signed or unsigned integers or
359 * integer vectors. The operand types must both be signed or both be
362 if (!type_a
->is_integer() || !type_b
->is_integer()
363 || (type_a
->base_type
!= type_b
->base_type
)) {
364 _mesa_glsl_error(loc
, state
, "type mismatch");
365 return glsl_type::error_type
;
368 /* "The operands cannot be vectors of differing size. If one operand is
369 * a scalar and the other vector, then the scalar is applied component-
370 * wise to the vector, resulting in the same type as the vector. If both
371 * are vectors of the same size, the result is computed component-wise."
373 if (type_a
->is_vector()) {
374 if (!type_b
->is_vector()
375 || (type_a
->vector_elements
== type_b
->vector_elements
))
380 /* "The operator modulus (%) is not defined for any other data types
381 * (non-integer types)."
383 _mesa_glsl_error(loc
, state
, "type mismatch");
384 return glsl_type::error_type
;
388 static const struct glsl_type
*
389 relational_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
390 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
392 const glsl_type
*type_a
= value_a
->type
;
393 const glsl_type
*type_b
= value_b
->type
;
395 /* From GLSL 1.50 spec, page 56:
396 * "The relational operators greater than (>), less than (<), greater
397 * than or equal (>=), and less than or equal (<=) operate only on
398 * scalar integer and scalar floating-point expressions."
400 if (!type_a
->is_numeric()
401 || !type_b
->is_numeric()
402 || !type_a
->is_scalar()
403 || !type_b
->is_scalar()) {
404 _mesa_glsl_error(loc
, state
,
405 "Operands to relational operators must be scalar and "
407 return glsl_type::error_type
;
410 /* "Either the operands' types must match, or the conversions from
411 * Section 4.1.10 "Implicit Conversions" will be applied to the integer
412 * operand, after which the types must match."
414 if (!apply_implicit_conversion(type_a
, value_b
, state
)
415 && !apply_implicit_conversion(type_b
, value_a
, state
)) {
416 _mesa_glsl_error(loc
, state
,
417 "Could not implicitly convert operands to "
418 "relational operator");
419 return glsl_type::error_type
;
421 type_a
= value_a
->type
;
422 type_b
= value_b
->type
;
424 if (type_a
->base_type
!= type_b
->base_type
) {
425 _mesa_glsl_error(loc
, state
, "base type mismatch");
426 return glsl_type::error_type
;
429 /* "The result is scalar Boolean."
431 return glsl_type::bool_type
;
436 * Validates that a value can be assigned to a location with a specified type
438 * Validates that \c rhs can be assigned to some location. If the types are
439 * not an exact match but an automatic conversion is possible, \c rhs will be
443 * \c NULL if \c rhs cannot be assigned to a location with type \c lhs_type.
444 * Otherwise the actual RHS to be assigned will be returned. This may be
445 * \c rhs, or it may be \c rhs after some type conversion.
448 * In addition to being used for assignments, this function is used to
449 * type-check return values.
452 validate_assignment(struct _mesa_glsl_parse_state
*state
,
453 const glsl_type
*lhs_type
, ir_rvalue
*rhs
)
455 const glsl_type
*rhs_type
= rhs
->type
;
457 /* If there is already some error in the RHS, just return it. Anything
458 * else will lead to an avalanche of error message back to the user.
460 if (rhs_type
->is_error())
463 /* If the types are identical, the assignment can trivially proceed.
465 if (rhs_type
== lhs_type
)
468 /* If the array element types are the same and the size of the LHS is zero,
469 * the assignment is okay.
471 * Note: Whole-array assignments are not permitted in GLSL 1.10, but this
472 * is handled by ir_dereference::is_lvalue.
474 if (lhs_type
->is_array() && rhs
->type
->is_array()
475 && (lhs_type
->element_type() == rhs
->type
->element_type())
476 && (lhs_type
->array_size() == 0)) {
480 /* Check for implicit conversion in GLSL 1.20 */
481 if (apply_implicit_conversion(lhs_type
, rhs
, state
)) {
482 rhs_type
= rhs
->type
;
483 if (rhs_type
== lhs_type
)
491 do_assignment(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
,
492 ir_rvalue
*lhs
, ir_rvalue
*rhs
,
496 bool error_emitted
= (lhs
->type
->is_error() || rhs
->type
->is_error());
498 if (!error_emitted
) {
499 /* FINISHME: This does not handle 'foo.bar.a.b.c[5].d = 5' */
500 if (!lhs
->is_lvalue()) {
501 _mesa_glsl_error(& lhs_loc
, state
, "non-lvalue in assignment");
502 error_emitted
= true;
506 ir_rvalue
*new_rhs
= validate_assignment(state
, lhs
->type
, rhs
);
507 if (new_rhs
== NULL
) {
508 _mesa_glsl_error(& lhs_loc
, state
, "type mismatch");
512 /* If the LHS array was not declared with a size, it takes it size from
513 * the RHS. If the LHS is an l-value and a whole array, it must be a
514 * dereference of a variable. Any other case would require that the LHS
515 * is either not an l-value or not a whole array.
517 if (lhs
->type
->array_size() == 0) {
518 ir_dereference
*const d
= lhs
->as_dereference();
522 ir_variable
*const var
= d
->variable_referenced();
526 if (var
->max_array_access
>= unsigned(rhs
->type
->array_size())) {
527 /* FINISHME: This should actually log the location of the RHS. */
528 _mesa_glsl_error(& lhs_loc
, state
, "array size must be > %u due to "
530 var
->max_array_access
);
533 var
->type
= glsl_type::get_array_instance(lhs
->type
->element_type(),
534 rhs
->type
->array_size());
539 /* Most callers of do_assignment (assign, add_assign, pre_inc/dec,
540 * but not post_inc) need the converted assigned value as an rvalue
541 * to handle things like:
545 * So we always just store the computed value being assigned to a
546 * temporary and return a deref of that temporary. If the rvalue
547 * ends up not being used, the temp will get copy-propagated out.
549 ir_variable
*var
= new(ctx
) ir_variable(rhs
->type
, "assignment_tmp",
551 ir_dereference_variable
*deref_var
= new(ctx
) ir_dereference_variable(var
);
552 instructions
->push_tail(var
);
553 instructions
->push_tail(new(ctx
) ir_assignment(deref_var
,
556 deref_var
= new(ctx
) ir_dereference_variable(var
);
558 instructions
->push_tail(new(ctx
) ir_assignment(lhs
,
562 return new(ctx
) ir_dereference_variable(var
);
566 get_lvalue_copy(exec_list
*instructions
, ir_rvalue
*lvalue
)
568 void *ctx
= talloc_parent(lvalue
);
571 /* FINISHME: Give unique names to the temporaries. */
572 var
= new(ctx
) ir_variable(lvalue
->type
, "_post_incdec_tmp",
574 instructions
->push_tail(var
);
575 var
->mode
= ir_var_auto
;
577 instructions
->push_tail(new(ctx
) ir_assignment(new(ctx
) ir_dereference_variable(var
),
580 /* Once we've created this temporary, mark it read only so it's no
581 * longer considered an lvalue.
583 var
->read_only
= true;
585 return new(ctx
) ir_dereference_variable(var
);
590 ast_node::hir(exec_list
*instructions
,
591 struct _mesa_glsl_parse_state
*state
)
601 ast_expression::hir(exec_list
*instructions
,
602 struct _mesa_glsl_parse_state
*state
)
605 static const int operations
[AST_NUM_OPERATORS
] = {
606 -1, /* ast_assign doesn't convert to ir_expression. */
607 -1, /* ast_plus doesn't convert to ir_expression. */
631 /* Note: The following block of expression types actually convert
632 * to multiple IR instructions.
634 ir_binop_mul
, /* ast_mul_assign */
635 ir_binop_div
, /* ast_div_assign */
636 ir_binop_mod
, /* ast_mod_assign */
637 ir_binop_add
, /* ast_add_assign */
638 ir_binop_sub
, /* ast_sub_assign */
639 ir_binop_lshift
, /* ast_ls_assign */
640 ir_binop_rshift
, /* ast_rs_assign */
641 ir_binop_bit_and
, /* ast_and_assign */
642 ir_binop_bit_xor
, /* ast_xor_assign */
643 ir_binop_bit_or
, /* ast_or_assign */
645 -1, /* ast_conditional doesn't convert to ir_expression. */
646 ir_binop_add
, /* ast_pre_inc. */
647 ir_binop_sub
, /* ast_pre_dec. */
648 ir_binop_add
, /* ast_post_inc. */
649 ir_binop_sub
, /* ast_post_dec. */
650 -1, /* ast_field_selection doesn't conv to ir_expression. */
651 -1, /* ast_array_index doesn't convert to ir_expression. */
652 -1, /* ast_function_call doesn't conv to ir_expression. */
653 -1, /* ast_identifier doesn't convert to ir_expression. */
654 -1, /* ast_int_constant doesn't convert to ir_expression. */
655 -1, /* ast_uint_constant doesn't conv to ir_expression. */
656 -1, /* ast_float_constant doesn't conv to ir_expression. */
657 -1, /* ast_bool_constant doesn't conv to ir_expression. */
658 -1, /* ast_sequence doesn't convert to ir_expression. */
660 ir_rvalue
*result
= NULL
;
662 const struct glsl_type
*type
= glsl_type::error_type
;
663 bool error_emitted
= false;
666 loc
= this->get_location();
668 switch (this->oper
) {
670 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
671 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
673 result
= do_assignment(instructions
, state
, op
[0], op
[1],
674 this->subexpressions
[0]->get_location());
675 error_emitted
= result
->type
->is_error();
681 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
683 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
685 error_emitted
= type
->is_error();
691 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
693 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
695 error_emitted
= type
->is_error();
697 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
705 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
706 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
708 type
= arithmetic_result_type(op
[0], op
[1],
709 (this->oper
== ast_mul
),
711 error_emitted
= type
->is_error();
713 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
718 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
719 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
721 type
= modulus_result_type(op
[0]->type
, op
[1]->type
, state
, & loc
);
723 assert(operations
[this->oper
] == ir_binop_mod
);
725 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
727 error_emitted
= type
->is_error();
732 _mesa_glsl_error(& loc
, state
, "FINISHME: implement bit-shift operators");
733 error_emitted
= true;
740 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
741 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
743 type
= relational_result_type(op
[0], op
[1], state
, & loc
);
745 /* The relational operators must either generate an error or result
746 * in a scalar boolean. See page 57 of the GLSL 1.50 spec.
748 assert(type
->is_error()
749 || ((type
->base_type
== GLSL_TYPE_BOOL
)
750 && type
->is_scalar()));
752 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
754 error_emitted
= type
->is_error();
759 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
760 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
762 /* From page 58 (page 64 of the PDF) of the GLSL 1.50 spec:
764 * "The equality operators equal (==), and not equal (!=)
765 * operate on all types. They result in a scalar Boolean. If
766 * the operand types do not match, then there must be a
767 * conversion from Section 4.1.10 "Implicit Conversions"
768 * applied to one operand that can make them match, in which
769 * case this conversion is done."
771 if ((!apply_implicit_conversion(op
[0]->type
, op
[1], state
)
772 && !apply_implicit_conversion(op
[1]->type
, op
[0], state
))
773 || (op
[0]->type
!= op
[1]->type
)) {
774 _mesa_glsl_error(& loc
, state
, "operands of `%s' must have the same "
775 "type", (this->oper
== ast_equal
) ? "==" : "!=");
776 error_emitted
= true;
777 } else if ((state
->language_version
<= 110)
778 && (op
[0]->type
->is_array() || op
[1]->type
->is_array())) {
779 _mesa_glsl_error(& loc
, state
, "array comparisons forbidden in "
781 error_emitted
= true;
784 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
786 type
= glsl_type::bool_type
;
788 assert(result
->type
== glsl_type::bool_type
);
795 _mesa_glsl_error(& loc
, state
, "FINISHME: implement bit-wise operators");
796 error_emitted
= true;
799 case ast_logic_and
: {
800 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
802 if (!op
[0]->type
->is_boolean() || !op
[0]->type
->is_scalar()) {
803 YYLTYPE loc
= this->subexpressions
[0]->get_location();
805 _mesa_glsl_error(& loc
, state
, "LHS of `%s' must be scalar boolean",
806 operator_string(this->oper
));
807 error_emitted
= true;
810 ir_constant
*op0_const
= op
[0]->constant_expression_value();
812 if (op0_const
->value
.b
[0]) {
813 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
815 if (!op
[1]->type
->is_boolean() || !op
[1]->type
->is_scalar()) {
816 YYLTYPE loc
= this->subexpressions
[1]->get_location();
818 _mesa_glsl_error(& loc
, state
,
819 "RHS of `%s' must be scalar boolean",
820 operator_string(this->oper
));
821 error_emitted
= true;
827 type
= glsl_type::bool_type
;
829 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
832 instructions
->push_tail(tmp
);
834 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
835 instructions
->push_tail(stmt
);
837 op
[1] = this->subexpressions
[1]->hir(&stmt
->then_instructions
, state
);
839 if (!op
[1]->type
->is_boolean() || !op
[1]->type
->is_scalar()) {
840 YYLTYPE loc
= this->subexpressions
[1]->get_location();
842 _mesa_glsl_error(& loc
, state
,
843 "RHS of `%s' must be scalar boolean",
844 operator_string(this->oper
));
845 error_emitted
= true;
848 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
849 ir_assignment
*const then_assign
=
850 new(ctx
) ir_assignment(then_deref
, op
[1], NULL
);
851 stmt
->then_instructions
.push_tail(then_assign
);
853 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
854 ir_assignment
*const else_assign
=
855 new(ctx
) ir_assignment(else_deref
, new(ctx
) ir_constant(false), NULL
);
856 stmt
->else_instructions
.push_tail(else_assign
);
858 result
= new(ctx
) ir_dereference_variable(tmp
);
865 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
867 if (!op
[0]->type
->is_boolean() || !op
[0]->type
->is_scalar()) {
868 YYLTYPE loc
= this->subexpressions
[0]->get_location();
870 _mesa_glsl_error(& loc
, state
, "LHS of `%s' must be scalar boolean",
871 operator_string(this->oper
));
872 error_emitted
= true;
875 ir_constant
*op0_const
= op
[0]->constant_expression_value();
877 if (op0_const
->value
.b
[0]) {
880 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
882 if (!op
[1]->type
->is_boolean() || !op
[1]->type
->is_scalar()) {
883 YYLTYPE loc
= this->subexpressions
[1]->get_location();
885 _mesa_glsl_error(& loc
, state
,
886 "RHS of `%s' must be scalar boolean",
887 operator_string(this->oper
));
888 error_emitted
= true;
892 type
= glsl_type::bool_type
;
894 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
897 instructions
->push_tail(tmp
);
899 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
900 instructions
->push_tail(stmt
);
902 op
[1] = this->subexpressions
[1]->hir(&stmt
->else_instructions
, state
);
904 if (!op
[1]->type
->is_boolean() || !op
[1]->type
->is_scalar()) {
905 YYLTYPE loc
= this->subexpressions
[1]->get_location();
907 _mesa_glsl_error(& loc
, state
, "RHS of `%s' must be scalar boolean",
908 operator_string(this->oper
));
909 error_emitted
= true;
912 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
913 ir_assignment
*const then_assign
=
914 new(ctx
) ir_assignment(then_deref
, new(ctx
) ir_constant(true), NULL
);
915 stmt
->then_instructions
.push_tail(then_assign
);
917 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
918 ir_assignment
*const else_assign
=
919 new(ctx
) ir_assignment(else_deref
, op
[1], NULL
);
920 stmt
->else_instructions
.push_tail(else_assign
);
922 result
= new(ctx
) ir_dereference_variable(tmp
);
929 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
930 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
933 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
935 type
= glsl_type::bool_type
;
939 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
941 if (!op
[0]->type
->is_boolean() || !op
[0]->type
->is_scalar()) {
942 YYLTYPE loc
= this->subexpressions
[0]->get_location();
944 _mesa_glsl_error(& loc
, state
,
945 "operand of `!' must be scalar boolean");
946 error_emitted
= true;
949 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
951 type
= glsl_type::bool_type
;
957 case ast_sub_assign
: {
958 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
959 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
961 type
= arithmetic_result_type(op
[0], op
[1],
962 (this->oper
== ast_mul_assign
),
965 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
968 result
= do_assignment(instructions
, state
,
969 op
[0]->clone(NULL
), temp_rhs
,
970 this->subexpressions
[0]->get_location());
972 error_emitted
= (op
[0]->type
->is_error());
974 /* GLSL 1.10 does not allow array assignment. However, we don't have to
975 * explicitly test for this because none of the binary expression
976 * operators allow array operands either.
982 case ast_mod_assign
: {
983 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
984 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
986 type
= modulus_result_type(op
[0]->type
, op
[1]->type
, state
, & loc
);
988 assert(operations
[this->oper
] == ir_binop_mod
);
990 struct ir_rvalue
*temp_rhs
;
991 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
994 result
= do_assignment(instructions
, state
,
995 op
[0]->clone(NULL
), temp_rhs
,
996 this->subexpressions
[0]->get_location());
998 error_emitted
= type
->is_error();
1004 _mesa_glsl_error(& loc
, state
,
1005 "FINISHME: implement bit-shift assignment operators");
1006 error_emitted
= true;
1009 case ast_and_assign
:
1010 case ast_xor_assign
:
1012 _mesa_glsl_error(& loc
, state
,
1013 "FINISHME: implement logic assignment operators");
1014 error_emitted
= true;
1017 case ast_conditional
: {
1018 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1020 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1022 * "The ternary selection operator (?:). It operates on three
1023 * expressions (exp1 ? exp2 : exp3). This operator evaluates the
1024 * first expression, which must result in a scalar Boolean."
1026 if (!op
[0]->type
->is_boolean() || !op
[0]->type
->is_scalar()) {
1027 YYLTYPE loc
= this->subexpressions
[0]->get_location();
1029 _mesa_glsl_error(& loc
, state
, "?: condition must be scalar boolean");
1030 error_emitted
= true;
1033 /* The :? operator is implemented by generating an anonymous temporary
1034 * followed by an if-statement. The last instruction in each branch of
1035 * the if-statement assigns a value to the anonymous temporary. This
1036 * temporary is the r-value of the expression.
1038 exec_list then_instructions
;
1039 exec_list else_instructions
;
1041 op
[1] = this->subexpressions
[1]->hir(&then_instructions
, state
);
1042 op
[2] = this->subexpressions
[2]->hir(&else_instructions
, state
);
1044 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1046 * "The second and third expressions can be any type, as
1047 * long their types match, or there is a conversion in
1048 * Section 4.1.10 "Implicit Conversions" that can be applied
1049 * to one of the expressions to make their types match. This
1050 * resulting matching type is the type of the entire
1053 if ((!apply_implicit_conversion(op
[1]->type
, op
[2], state
)
1054 && !apply_implicit_conversion(op
[2]->type
, op
[1], state
))
1055 || (op
[1]->type
!= op
[2]->type
)) {
1056 YYLTYPE loc
= this->subexpressions
[1]->get_location();
1058 _mesa_glsl_error(& loc
, state
, "Second and third operands of ?: "
1059 "operator must have matching types.");
1060 error_emitted
= true;
1061 type
= glsl_type::error_type
;
1066 ir_constant
*cond_val
= op
[0]->constant_expression_value();
1067 ir_constant
*then_val
= op
[1]->constant_expression_value();
1068 ir_constant
*else_val
= op
[2]->constant_expression_value();
1070 if (then_instructions
.is_empty()
1071 && else_instructions
.is_empty()
1072 && (cond_val
!= NULL
) && (then_val
!= NULL
) && (else_val
!= NULL
)) {
1073 result
= (cond_val
->value
.b
[0]) ? then_val
: else_val
;
1075 ir_variable
*const tmp
=
1076 new(ctx
) ir_variable(type
, "conditional_tmp", ir_var_temporary
);
1077 instructions
->push_tail(tmp
);
1079 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1080 instructions
->push_tail(stmt
);
1082 then_instructions
.move_nodes_to(& stmt
->then_instructions
);
1083 ir_dereference
*const then_deref
=
1084 new(ctx
) ir_dereference_variable(tmp
);
1085 ir_assignment
*const then_assign
=
1086 new(ctx
) ir_assignment(then_deref
, op
[1], NULL
);
1087 stmt
->then_instructions
.push_tail(then_assign
);
1089 else_instructions
.move_nodes_to(& stmt
->else_instructions
);
1090 ir_dereference
*const else_deref
=
1091 new(ctx
) ir_dereference_variable(tmp
);
1092 ir_assignment
*const else_assign
=
1093 new(ctx
) ir_assignment(else_deref
, op
[2], NULL
);
1094 stmt
->else_instructions
.push_tail(else_assign
);
1096 result
= new(ctx
) ir_dereference_variable(tmp
);
1103 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1104 if (op
[0]->type
->base_type
== GLSL_TYPE_FLOAT
)
1105 op
[1] = new(ctx
) ir_constant(1.0f
);
1107 op
[1] = new(ctx
) ir_constant(1);
1109 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1111 struct ir_rvalue
*temp_rhs
;
1112 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1115 result
= do_assignment(instructions
, state
,
1116 op
[0]->clone(NULL
), temp_rhs
,
1117 this->subexpressions
[0]->get_location());
1118 type
= result
->type
;
1119 error_emitted
= op
[0]->type
->is_error();
1124 case ast_post_dec
: {
1125 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1126 if (op
[0]->type
->base_type
== GLSL_TYPE_FLOAT
)
1127 op
[1] = new(ctx
) ir_constant(1.0f
);
1129 op
[1] = new(ctx
) ir_constant(1);
1131 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1133 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1135 struct ir_rvalue
*temp_rhs
;
1136 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1139 /* Get a temporary of a copy of the lvalue before it's modified.
1140 * This may get thrown away later.
1142 result
= get_lvalue_copy(instructions
, op
[0]->clone(NULL
));
1144 (void)do_assignment(instructions
, state
,
1145 op
[0]->clone(NULL
), temp_rhs
,
1146 this->subexpressions
[0]->get_location());
1148 type
= result
->type
;
1149 error_emitted
= op
[0]->type
->is_error();
1153 case ast_field_selection
:
1154 result
= _mesa_ast_field_selection_to_hir(this, instructions
, state
);
1155 type
= result
->type
;
1158 case ast_array_index
: {
1159 YYLTYPE index_loc
= subexpressions
[1]->get_location();
1161 op
[0] = subexpressions
[0]->hir(instructions
, state
);
1162 op
[1] = subexpressions
[1]->hir(instructions
, state
);
1164 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1166 ir_rvalue
*const array
= op
[0];
1168 result
= new(ctx
) ir_dereference_array(op
[0], op
[1]);
1170 /* Do not use op[0] after this point. Use array.
1178 if (!array
->type
->is_array()
1179 && !array
->type
->is_matrix()
1180 && !array
->type
->is_vector()) {
1181 _mesa_glsl_error(& index_loc
, state
,
1182 "cannot dereference non-array / non-matrix / "
1184 error_emitted
= true;
1187 if (!op
[1]->type
->is_integer()) {
1188 _mesa_glsl_error(& index_loc
, state
,
1189 "array index must be integer type");
1190 error_emitted
= true;
1191 } else if (!op
[1]->type
->is_scalar()) {
1192 _mesa_glsl_error(& index_loc
, state
,
1193 "array index must be scalar");
1194 error_emitted
= true;
1197 /* If the array index is a constant expression and the array has a
1198 * declared size, ensure that the access is in-bounds. If the array
1199 * index is not a constant expression, ensure that the array has a
1202 ir_constant
*const const_index
= op
[1]->constant_expression_value();
1203 if (const_index
!= NULL
) {
1204 const int idx
= const_index
->value
.i
[0];
1205 const char *type_name
;
1208 if (array
->type
->is_matrix()) {
1209 type_name
= "matrix";
1210 } else if (array
->type
->is_vector()) {
1211 type_name
= "vector";
1213 type_name
= "array";
1216 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec:
1218 * "It is illegal to declare an array with a size, and then
1219 * later (in the same shader) index the same array with an
1220 * integral constant expression greater than or equal to the
1221 * declared size. It is also illegal to index an array with a
1222 * negative constant expression."
1224 if (array
->type
->is_matrix()) {
1225 if (array
->type
->row_type()->vector_elements
<= idx
) {
1226 bound
= array
->type
->row_type()->vector_elements
;
1228 } else if (array
->type
->is_vector()) {
1229 if (array
->type
->vector_elements
<= idx
) {
1230 bound
= array
->type
->vector_elements
;
1233 if ((array
->type
->array_size() > 0)
1234 && (array
->type
->array_size() <= idx
)) {
1235 bound
= array
->type
->array_size();
1240 _mesa_glsl_error(& loc
, state
, "%s index must be < %u",
1242 error_emitted
= true;
1243 } else if (idx
< 0) {
1244 _mesa_glsl_error(& loc
, state
, "%s index must be >= 0",
1246 error_emitted
= true;
1249 if (array
->type
->is_array()) {
1250 /* If the array is a variable dereference, it dereferences the
1251 * whole array, by definition. Use this to get the variable.
1253 * FINISHME: Should some methods for getting / setting / testing
1254 * FINISHME: array access limits be added to ir_dereference?
1256 ir_variable
*const v
= array
->whole_variable_referenced();
1257 if ((v
!= NULL
) && (unsigned(idx
) > v
->max_array_access
))
1258 v
->max_array_access
= idx
;
1260 } else if (array
->type
->array_size() == 0) {
1261 _mesa_glsl_error(&loc
, state
, "unsized array index must be constant");
1265 result
->type
= glsl_type::error_type
;
1267 type
= result
->type
;
1271 case ast_function_call
:
1272 /* Should *NEVER* get here. ast_function_call should always be handled
1273 * by ast_function_expression::hir.
1278 case ast_identifier
: {
1279 /* ast_identifier can appear several places in a full abstract syntax
1280 * tree. This particular use must be at location specified in the grammar
1281 * as 'variable_identifier'.
1284 state
->symbols
->get_variable(this->primary_expression
.identifier
);
1286 result
= new(ctx
) ir_dereference_variable(var
);
1289 type
= result
->type
;
1291 _mesa_glsl_error(& loc
, state
, "`%s' undeclared",
1292 this->primary_expression
.identifier
);
1294 error_emitted
= true;
1299 case ast_int_constant
:
1300 type
= glsl_type::int_type
;
1301 result
= new(ctx
) ir_constant(this->primary_expression
.int_constant
);
1304 case ast_uint_constant
:
1305 type
= glsl_type::uint_type
;
1306 result
= new(ctx
) ir_constant(this->primary_expression
.uint_constant
);
1309 case ast_float_constant
:
1310 type
= glsl_type::float_type
;
1311 result
= new(ctx
) ir_constant(this->primary_expression
.float_constant
);
1314 case ast_bool_constant
:
1315 type
= glsl_type::bool_type
;
1316 result
= new(ctx
) ir_constant(bool(this->primary_expression
.bool_constant
));
1319 case ast_sequence
: {
1320 /* It should not be possible to generate a sequence in the AST without
1321 * any expressions in it.
1323 assert(!this->expressions
.is_empty());
1325 /* The r-value of a sequence is the last expression in the sequence. If
1326 * the other expressions in the sequence do not have side-effects (and
1327 * therefore add instructions to the instruction list), they get dropped
1330 foreach_list_typed (ast_node
, ast
, link
, &this->expressions
)
1331 result
= ast
->hir(instructions
, state
);
1333 type
= result
->type
;
1335 /* Any errors should have already been emitted in the loop above.
1337 error_emitted
= true;
1342 if (type
->is_error() && !error_emitted
)
1343 _mesa_glsl_error(& loc
, state
, "type mismatch");
1350 ast_expression_statement::hir(exec_list
*instructions
,
1351 struct _mesa_glsl_parse_state
*state
)
1353 /* It is possible to have expression statements that don't have an
1354 * expression. This is the solitary semicolon:
1356 * for (i = 0; i < 5; i++)
1359 * In this case the expression will be NULL. Test for NULL and don't do
1360 * anything in that case.
1362 if (expression
!= NULL
)
1363 expression
->hir(instructions
, state
);
1365 /* Statements do not have r-values.
1372 ast_compound_statement::hir(exec_list
*instructions
,
1373 struct _mesa_glsl_parse_state
*state
)
1376 state
->symbols
->push_scope();
1378 foreach_list_typed (ast_node
, ast
, link
, &this->statements
)
1379 ast
->hir(instructions
, state
);
1382 state
->symbols
->pop_scope();
1384 /* Compound statements do not have r-values.
1390 static const glsl_type
*
1391 process_array_type(const glsl_type
*base
, ast_node
*array_size
,
1392 struct _mesa_glsl_parse_state
*state
)
1394 unsigned length
= 0;
1396 /* FINISHME: Reject delcarations of multidimensional arrays. */
1398 if (array_size
!= NULL
) {
1399 exec_list dummy_instructions
;
1400 ir_rvalue
*const ir
= array_size
->hir(& dummy_instructions
, state
);
1401 YYLTYPE loc
= array_size
->get_location();
1403 /* FINISHME: Verify that the grammar forbids side-effects in array
1404 * FINISHME: sizes. i.e., 'vec4 [x = 12] data'
1406 assert(dummy_instructions
.is_empty());
1409 if (!ir
->type
->is_integer()) {
1410 _mesa_glsl_error(& loc
, state
, "array size must be integer type");
1411 } else if (!ir
->type
->is_scalar()) {
1412 _mesa_glsl_error(& loc
, state
, "array size must be scalar type");
1414 ir_constant
*const size
= ir
->constant_expression_value();
1417 _mesa_glsl_error(& loc
, state
, "array size must be a "
1418 "constant valued expression");
1419 } else if (size
->value
.i
[0] <= 0) {
1420 _mesa_glsl_error(& loc
, state
, "array size must be > 0");
1422 assert(size
->type
== ir
->type
);
1423 length
= size
->value
.u
[0];
1429 return glsl_type::get_array_instance(base
, length
);
1434 ast_type_specifier::glsl_type(const char **name
,
1435 struct _mesa_glsl_parse_state
*state
) const
1437 const struct glsl_type
*type
;
1439 if ((this->type_specifier
== ast_struct
) && (this->type_name
== NULL
)) {
1440 /* FINISHME: Handle annonymous structures. */
1443 type
= state
->symbols
->get_type(this->type_name
);
1444 *name
= this->type_name
;
1446 if (this->is_array
) {
1447 type
= process_array_type(type
, this->array_size
, state
);
1456 apply_type_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
1457 struct ir_variable
*var
,
1458 struct _mesa_glsl_parse_state
*state
,
1461 if (qual
->invariant
)
1464 /* FINISHME: Mark 'in' variables at global scope as read-only. */
1465 if (qual
->constant
|| qual
->attribute
|| qual
->uniform
1466 || (qual
->varying
&& (state
->target
== fragment_shader
)))
1472 if (qual
->attribute
&& state
->target
!= vertex_shader
) {
1473 var
->type
= glsl_type::error_type
;
1474 _mesa_glsl_error(loc
, state
,
1475 "`attribute' variables may not be declared in the "
1477 _mesa_glsl_shader_target_name(state
->target
));
1480 /* From page 25 (page 31 of the PDF) of the GLSL 1.10 spec:
1482 * "The varying qualifier can be used only with the data types
1483 * float, vec2, vec3, vec4, mat2, mat3, and mat4, or arrays of
1486 if (qual
->varying
) {
1487 const glsl_type
*non_array_type
;
1489 if (var
->type
&& var
->type
->is_array())
1490 non_array_type
= var
->type
->fields
.array
;
1492 non_array_type
= var
->type
;
1494 if (non_array_type
&& non_array_type
->base_type
!= GLSL_TYPE_FLOAT
) {
1495 var
->type
= glsl_type::error_type
;
1496 _mesa_glsl_error(loc
, state
,
1497 "varying variables must be of base type float");
1501 /* If there is no qualifier that changes the mode of the variable, leave
1502 * the setting alone.
1504 if (qual
->in
&& qual
->out
)
1505 var
->mode
= ir_var_inout
;
1506 else if (qual
->attribute
|| qual
->in
1507 || (qual
->varying
&& (state
->target
== fragment_shader
)))
1508 var
->mode
= ir_var_in
;
1509 else if (qual
->out
|| (qual
->varying
&& (state
->target
== vertex_shader
)))
1510 var
->mode
= ir_var_out
;
1511 else if (qual
->uniform
)
1512 var
->mode
= ir_var_uniform
;
1515 var
->shader_in
= true;
1517 /* Any 'in' or 'inout' variables at global scope must be marked as being
1518 * shader inputs. Likewise, any 'out' or 'inout' variables at global scope
1519 * must be marked as being shader outputs.
1521 if (state
->current_function
== NULL
) {
1522 switch (var
->mode
) {
1524 case ir_var_uniform
:
1525 var
->shader_in
= true;
1528 var
->shader_out
= true;
1531 var
->shader_in
= true;
1532 var
->shader_out
= true;
1540 var
->interpolation
= ir_var_flat
;
1541 else if (qual
->noperspective
)
1542 var
->interpolation
= ir_var_noperspective
;
1544 var
->interpolation
= ir_var_smooth
;
1546 var
->pixel_center_integer
= qual
->pixel_center_integer
;
1547 var
->origin_upper_left
= qual
->origin_upper_left
;
1548 if ((qual
->origin_upper_left
|| qual
->pixel_center_integer
)
1549 && (strcmp(var
->name
, "gl_FragCoord") != 0)) {
1550 const char *const qual_string
= (qual
->origin_upper_left
)
1551 ? "origin_upper_left" : "pixel_center_integer";
1553 _mesa_glsl_error(loc
, state
,
1554 "layout qualifier `%s' can only be applied to "
1555 "fragment shader input `gl_FragCoord'",
1559 if (var
->type
->is_array() && (state
->language_version
>= 120)) {
1560 var
->array_lvalue
= true;
1566 ast_declarator_list::hir(exec_list
*instructions
,
1567 struct _mesa_glsl_parse_state
*state
)
1570 const struct glsl_type
*decl_type
;
1571 const char *type_name
= NULL
;
1572 ir_rvalue
*result
= NULL
;
1573 YYLTYPE loc
= this->get_location();
1575 /* From page 46 (page 52 of the PDF) of the GLSL 1.50 spec:
1577 * "To ensure that a particular output variable is invariant, it is
1578 * necessary to use the invariant qualifier. It can either be used to
1579 * qualify a previously declared variable as being invariant
1581 * invariant gl_Position; // make existing gl_Position be invariant"
1583 * In these cases the parser will set the 'invariant' flag in the declarator
1584 * list, and the type will be NULL.
1586 if (this->invariant
) {
1587 assert(this->type
== NULL
);
1589 if (state
->current_function
!= NULL
) {
1590 _mesa_glsl_error(& loc
, state
,
1591 "All uses of `invariant' keyword must be at global "
1595 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
1596 assert(!decl
->is_array
);
1597 assert(decl
->array_size
== NULL
);
1598 assert(decl
->initializer
== NULL
);
1600 ir_variable
*const earlier
=
1601 state
->symbols
->get_variable(decl
->identifier
);
1602 if (earlier
== NULL
) {
1603 _mesa_glsl_error(& loc
, state
,
1604 "Undeclared variable `%s' cannot be marked "
1605 "invariant\n", decl
->identifier
);
1606 } else if ((state
->target
== vertex_shader
)
1607 && (earlier
->mode
!= ir_var_out
)) {
1608 _mesa_glsl_error(& loc
, state
,
1609 "`%s' cannot be marked invariant, vertex shader "
1610 "outputs only\n", decl
->identifier
);
1611 } else if ((state
->target
== fragment_shader
)
1612 && (earlier
->mode
!= ir_var_in
)) {
1613 _mesa_glsl_error(& loc
, state
,
1614 "`%s' cannot be marked invariant, fragment shader "
1615 "inputs only\n", decl
->identifier
);
1617 earlier
->invariant
= true;
1621 /* Invariant redeclarations do not have r-values.
1626 assert(this->type
!= NULL
);
1627 assert(!this->invariant
);
1629 /* The type specifier may contain a structure definition. Process that
1630 * before any of the variable declarations.
1632 (void) this->type
->specifier
->hir(instructions
, state
);
1634 decl_type
= this->type
->specifier
->glsl_type(& type_name
, state
);
1635 if (this->declarations
.is_empty()) {
1636 /* The only valid case where the declaration list can be empty is when
1637 * the declaration is setting the default precision of a built-in type
1638 * (e.g., 'precision highp vec4;').
1641 if (decl_type
!= NULL
) {
1643 _mesa_glsl_error(& loc
, state
, "incomplete declaration");
1647 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
1648 const struct glsl_type
*var_type
;
1649 struct ir_variable
*var
;
1651 /* FINISHME: Emit a warning if a variable declaration shadows a
1652 * FINISHME: declaration at a higher scope.
1655 if ((decl_type
== NULL
) || decl_type
->is_void()) {
1656 if (type_name
!= NULL
) {
1657 _mesa_glsl_error(& loc
, state
,
1658 "invalid type `%s' in declaration of `%s'",
1659 type_name
, decl
->identifier
);
1661 _mesa_glsl_error(& loc
, state
,
1662 "invalid type in declaration of `%s'",
1668 if (decl
->is_array
) {
1669 var_type
= process_array_type(decl_type
, decl
->array_size
, state
);
1671 var_type
= decl_type
;
1674 var
= new(ctx
) ir_variable(var_type
, decl
->identifier
, ir_var_auto
);
1676 /* From page 22 (page 28 of the PDF) of the GLSL 1.10 specification;
1678 * "Global variables can only use the qualifiers const,
1679 * attribute, uni form, or varying. Only one may be
1682 * Local variables can only use the qualifier const."
1684 * This is relaxed in GLSL 1.30.
1686 if (state
->language_version
< 120) {
1687 if (this->type
->qualifier
.out
) {
1688 _mesa_glsl_error(& loc
, state
,
1689 "`out' qualifier in declaration of `%s' "
1690 "only valid for function parameters in GLSL 1.10.",
1693 if (this->type
->qualifier
.in
) {
1694 _mesa_glsl_error(& loc
, state
,
1695 "`in' qualifier in declaration of `%s' "
1696 "only valid for function parameters in GLSL 1.10.",
1699 /* FINISHME: Test for other invalid qualifiers. */
1702 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
,
1705 if (this->type
->qualifier
.invariant
) {
1706 if ((state
->target
== vertex_shader
) && !var
->shader_out
) {
1707 _mesa_glsl_error(& loc
, state
,
1708 "`%s' cannot be marked invariant, vertex shader "
1709 "outputs only\n", var
->name
);
1710 } else if ((state
->target
== fragment_shader
) && !var
->shader_in
) {
1711 _mesa_glsl_error(& loc
, state
,
1712 "`%s' cannot be marked invariant, fragment shader "
1713 "inputs only\n", var
->name
);
1717 if (state
->current_function
!= NULL
) {
1718 const char *mode
= NULL
;
1719 const char *extra
= "";
1721 /* There is no need to check for 'inout' here because the parser will
1722 * only allow that in function parameter lists.
1724 if (this->type
->qualifier
.attribute
) {
1726 } else if (this->type
->qualifier
.uniform
) {
1728 } else if (this->type
->qualifier
.varying
) {
1730 } else if (this->type
->qualifier
.in
) {
1732 extra
= " or in function parameter list";
1733 } else if (this->type
->qualifier
.out
) {
1735 extra
= " or in function parameter list";
1739 _mesa_glsl_error(& loc
, state
,
1740 "%s variable `%s' must be declared at "
1742 mode
, var
->name
, extra
);
1744 } else if (var
->mode
== ir_var_in
) {
1745 if (state
->target
== vertex_shader
) {
1746 bool error_emitted
= false;
1748 /* From page 31 (page 37 of the PDF) of the GLSL 1.50 spec:
1750 * "Vertex shader inputs can only be float, floating-point
1751 * vectors, matrices, signed and unsigned integers and integer
1752 * vectors. Vertex shader inputs can also form arrays of these
1753 * types, but not structures."
1755 * From page 31 (page 27 of the PDF) of the GLSL 1.30 spec:
1757 * "Vertex shader inputs can only be float, floating-point
1758 * vectors, matrices, signed and unsigned integers and integer
1759 * vectors. They cannot be arrays or structures."
1761 * From page 23 (page 29 of the PDF) of the GLSL 1.20 spec:
1763 * "The attribute qualifier can be used only with float,
1764 * floating-point vectors, and matrices. Attribute variables
1765 * cannot be declared as arrays or structures."
1767 const glsl_type
*check_type
= var
->type
->is_array()
1768 ? var
->type
->fields
.array
: var
->type
;
1770 switch (check_type
->base_type
) {
1771 case GLSL_TYPE_FLOAT
:
1773 case GLSL_TYPE_UINT
:
1775 if (state
->language_version
> 120)
1779 _mesa_glsl_error(& loc
, state
,
1780 "vertex shader input / attribute cannot have "
1782 var
->type
->is_array() ? "array of " : "",
1784 error_emitted
= true;
1787 if (!error_emitted
&& (state
->language_version
<= 130)
1788 && var
->type
->is_array()) {
1789 _mesa_glsl_error(& loc
, state
,
1790 "vertex shader input / attribute cannot have "
1792 error_emitted
= true;
1797 /* Process the initializer and add its instructions to a temporary
1798 * list. This list will be added to the instruction stream (below) after
1799 * the declaration is added. This is done because in some cases (such as
1800 * redeclarations) the declaration may not actually be added to the
1801 * instruction stream.
1803 exec_list initializer_instructions
;
1804 if (decl
->initializer
!= NULL
) {
1805 YYLTYPE initializer_loc
= decl
->initializer
->get_location();
1807 /* From page 24 (page 30 of the PDF) of the GLSL 1.10 spec:
1809 * "All uniform variables are read-only and are initialized either
1810 * directly by an application via API commands, or indirectly by
1813 if ((state
->language_version
<= 110)
1814 && (var
->mode
== ir_var_uniform
)) {
1815 _mesa_glsl_error(& initializer_loc
, state
,
1816 "cannot initialize uniforms in GLSL 1.10");
1819 if (var
->type
->is_sampler()) {
1820 _mesa_glsl_error(& initializer_loc
, state
,
1821 "cannot initialize samplers");
1824 if ((var
->mode
== ir_var_in
) && (state
->current_function
== NULL
)) {
1825 _mesa_glsl_error(& initializer_loc
, state
,
1826 "cannot initialize %s shader input / %s",
1827 _mesa_glsl_shader_target_name(state
->target
),
1828 (state
->target
== vertex_shader
)
1829 ? "attribute" : "varying");
1832 ir_dereference
*const lhs
= new(ctx
) ir_dereference_variable(var
);
1833 ir_rvalue
*rhs
= decl
->initializer
->hir(&initializer_instructions
,
1836 /* Calculate the constant value if this is a const or uniform
1839 if (this->type
->qualifier
.constant
|| this->type
->qualifier
.uniform
) {
1840 ir_rvalue
*new_rhs
= validate_assignment(state
, var
->type
, rhs
);
1841 if (new_rhs
!= NULL
) {
1844 _mesa_glsl_error(&initializer_loc
, state
,
1845 "initializer of type %s cannot be assigned to "
1846 "variable of type %s",
1847 rhs
->type
->name
, var
->type
->name
);
1850 ir_constant
*constant_value
= rhs
->constant_expression_value();
1851 if (!constant_value
) {
1852 _mesa_glsl_error(& initializer_loc
, state
,
1853 "initializer of %s variable `%s' must be a "
1854 "constant expression",
1855 (this->type
->qualifier
.constant
)
1856 ? "const" : "uniform",
1859 rhs
= constant_value
;
1860 var
->constant_value
= constant_value
;
1864 if (rhs
&& !rhs
->type
->is_error()) {
1865 bool temp
= var
->read_only
;
1866 if (this->type
->qualifier
.constant
)
1867 var
->read_only
= false;
1869 /* Never emit code to initialize a uniform.
1871 if (!this->type
->qualifier
.uniform
)
1872 result
= do_assignment(&initializer_instructions
, state
,
1874 this->get_location());
1875 var
->read_only
= temp
;
1879 /* From page 23 (page 29 of the PDF) of the GLSL 1.10 spec:
1881 * "It is an error to write to a const variable outside of
1882 * its declaration, so they must be initialized when
1885 if (this->type
->qualifier
.constant
&& decl
->initializer
== NULL
) {
1886 _mesa_glsl_error(& loc
, state
,
1887 "const declaration of `%s' must be initialized");
1890 /* Attempt to add the variable to the symbol table. If this fails, it
1891 * means the variable has already been declared at this scope. Arrays
1892 * fudge this rule a little bit.
1894 * From page 24 (page 30 of the PDF) of the GLSL 1.50 spec,
1896 * "It is legal to declare an array without a size and then
1897 * later re-declare the same name as an array of the same
1898 * type and specify a size."
1900 if (state
->symbols
->name_declared_this_scope(decl
->identifier
)) {
1901 ir_variable
*const earlier
=
1902 state
->symbols
->get_variable(decl
->identifier
);
1904 if ((earlier
!= NULL
)
1905 && (earlier
->type
->array_size() == 0)
1906 && var
->type
->is_array()
1907 && (var
->type
->element_type() == earlier
->type
->element_type())) {
1908 /* FINISHME: This doesn't match the qualifiers on the two
1909 * FINISHME: declarations. It's not 100% clear whether this is
1910 * FINISHME: required or not.
1913 /* From page 54 (page 60 of the PDF) of the GLSL 1.20 spec:
1915 * "The size [of gl_TexCoord] can be at most
1916 * gl_MaxTextureCoords."
1918 const unsigned size
= unsigned(var
->type
->array_size());
1919 if ((strcmp("gl_TexCoord", var
->name
) == 0)
1920 && (size
> state
->Const
.MaxTextureCoords
)) {
1921 YYLTYPE loc
= this->get_location();
1923 _mesa_glsl_error(& loc
, state
, "`gl_TexCoord' array size cannot "
1924 "be larger than gl_MaxTextureCoords (%u)\n",
1925 state
->Const
.MaxTextureCoords
);
1926 } else if ((size
> 0) && (size
<= earlier
->max_array_access
)) {
1927 YYLTYPE loc
= this->get_location();
1929 _mesa_glsl_error(& loc
, state
, "array size must be > %u due to "
1931 earlier
->max_array_access
);
1934 earlier
->type
= var
->type
;
1937 } else if (state
->extensions
->ARB_fragment_coord_conventions
&&
1938 (earlier
!= NULL
) &&
1939 (strcmp(var
->name
, "gl_FragCoord") == 0) &&
1940 earlier
->type
== var
->type
&&
1941 earlier
->mode
== var
->mode
) {
1942 /* Allow redeclaration of gl_FragCoord for ARB_fcc layout
1945 earlier
->origin_upper_left
= var
->origin_upper_left
;
1946 earlier
->pixel_center_integer
= var
->pixel_center_integer
;
1948 YYLTYPE loc
= this->get_location();
1950 _mesa_glsl_error(& loc
, state
, "`%s' redeclared",
1957 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
1959 * "Identifiers starting with "gl_" are reserved for use by
1960 * OpenGL, and may not be declared in a shader as either a
1961 * variable or a function."
1963 if (strncmp(decl
->identifier
, "gl_", 3) == 0) {
1964 /* FINISHME: This should only trigger if we're not redefining
1965 * FINISHME: a builtin (to add a qualifier, for example).
1967 _mesa_glsl_error(& loc
, state
,
1968 "identifier `%s' uses reserved `gl_' prefix",
1972 instructions
->push_tail(var
);
1973 instructions
->append_list(&initializer_instructions
);
1975 /* Add the variable to the symbol table after processing the initializer.
1976 * This differs from most C-like languages, but it follows the GLSL
1977 * specification. From page 28 (page 34 of the PDF) of the GLSL 1.50
1980 * "Within a declaration, the scope of a name starts immediately
1981 * after the initializer if present or immediately after the name
1982 * being declared if not."
1984 const bool added_variable
=
1985 state
->symbols
->add_variable(var
->name
, var
);
1986 assert(added_variable
);
1990 /* Generally, variable declarations do not have r-values. However,
1991 * one is used for the declaration in
1993 * while (bool b = some_condition()) {
1997 * so we return the rvalue from the last seen declaration here.
2004 ast_parameter_declarator::hir(exec_list
*instructions
,
2005 struct _mesa_glsl_parse_state
*state
)
2008 const struct glsl_type
*type
;
2009 const char *name
= NULL
;
2010 YYLTYPE loc
= this->get_location();
2012 type
= this->type
->specifier
->glsl_type(& name
, state
);
2016 _mesa_glsl_error(& loc
, state
,
2017 "invalid type `%s' in declaration of `%s'",
2018 name
, this->identifier
);
2020 _mesa_glsl_error(& loc
, state
,
2021 "invalid type in declaration of `%s'",
2025 type
= glsl_type::error_type
;
2028 /* From page 62 (page 68 of the PDF) of the GLSL 1.50 spec:
2030 * "Functions that accept no input arguments need not use void in the
2031 * argument list because prototypes (or definitions) are required and
2032 * therefore there is no ambiguity when an empty argument list "( )" is
2033 * declared. The idiom "(void)" as a parameter list is provided for
2036 * Placing this check here prevents a void parameter being set up
2037 * for a function, which avoids tripping up checks for main taking
2038 * parameters and lookups of an unnamed symbol.
2040 if (type
->is_void()) {
2041 if (this->identifier
!= NULL
)
2042 _mesa_glsl_error(& loc
, state
,
2043 "named parameter cannot have type `void'");
2049 if (formal_parameter
&& (this->identifier
== NULL
)) {
2050 _mesa_glsl_error(& loc
, state
, "formal parameter lacks a name");
2055 ir_variable
*var
= new(ctx
) ir_variable(type
, this->identifier
, ir_var_in
);
2057 /* FINISHME: Handle array declarations. Note that this requires
2058 * FINISHME: complete handling of constant expressions.
2061 /* Apply any specified qualifiers to the parameter declaration. Note that
2062 * for function parameters the default mode is 'in'.
2064 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
, & loc
);
2066 instructions
->push_tail(var
);
2068 /* Parameter declarations do not have r-values.
2075 ast_parameter_declarator::parameters_to_hir(exec_list
*ast_parameters
,
2077 exec_list
*ir_parameters
,
2078 _mesa_glsl_parse_state
*state
)
2080 ast_parameter_declarator
*void_param
= NULL
;
2083 foreach_list_typed (ast_parameter_declarator
, param
, link
, ast_parameters
) {
2084 param
->formal_parameter
= formal
;
2085 param
->hir(ir_parameters
, state
);
2093 if ((void_param
!= NULL
) && (count
> 1)) {
2094 YYLTYPE loc
= void_param
->get_location();
2096 _mesa_glsl_error(& loc
, state
,
2097 "`void' parameter must be only parameter");
2103 ast_function::hir(exec_list
*instructions
,
2104 struct _mesa_glsl_parse_state
*state
)
2107 ir_function
*f
= NULL
;
2108 ir_function_signature
*sig
= NULL
;
2109 exec_list hir_parameters
;
2111 const char *const name
= identifier
;
2113 /* Convert the list of function parameters to HIR now so that they can be
2114 * used below to compare this function's signature with previously seen
2115 * signatures for functions with the same name.
2117 ast_parameter_declarator::parameters_to_hir(& this->parameters
,
2119 & hir_parameters
, state
);
2121 const char *return_type_name
;
2122 const glsl_type
*return_type
=
2123 this->return_type
->specifier
->glsl_type(& return_type_name
, state
);
2125 assert(return_type
!= NULL
);
2127 /* From page 56 (page 62 of the PDF) of the GLSL 1.30 spec:
2128 * "No qualifier is allowed on the return type of a function."
2130 if (this->return_type
->has_qualifiers()) {
2131 YYLTYPE loc
= this->get_location();
2132 _mesa_glsl_error(& loc
, state
,
2133 "function `%s' return type has qualifiers", name
);
2136 /* Verify that this function's signature either doesn't match a previously
2137 * seen signature for a function with the same name, or, if a match is found,
2138 * that the previously seen signature does not have an associated definition.
2140 f
= state
->symbols
->get_function(name
);
2142 ir_function_signature
*sig
= f
->exact_matching_signature(&hir_parameters
);
2144 const char *badvar
= sig
->qualifiers_match(&hir_parameters
);
2145 if (badvar
!= NULL
) {
2146 YYLTYPE loc
= this->get_location();
2148 _mesa_glsl_error(&loc
, state
, "function `%s' parameter `%s' "
2149 "qualifiers don't match prototype", name
, badvar
);
2152 if (sig
->return_type
!= return_type
) {
2153 YYLTYPE loc
= this->get_location();
2155 _mesa_glsl_error(&loc
, state
, "function `%s' return type doesn't "
2156 "match prototype", name
);
2159 if (is_definition
&& sig
->is_defined
) {
2160 YYLTYPE loc
= this->get_location();
2162 _mesa_glsl_error(& loc
, state
, "function `%s' redefined", name
);
2166 } else if (state
->symbols
->name_declared_this_scope(name
)) {
2167 /* This function name shadows a non-function use of the same name.
2169 YYLTYPE loc
= this->get_location();
2171 _mesa_glsl_error(& loc
, state
, "function name `%s' conflicts with "
2172 "non-function", name
);
2175 f
= new(ctx
) ir_function(name
);
2176 state
->symbols
->add_function(f
->name
, f
);
2178 /* Emit the new function header */
2179 instructions
->push_tail(f
);
2182 /* Verify the return type of main() */
2183 if (strcmp(name
, "main") == 0) {
2184 if (! return_type
->is_void()) {
2185 YYLTYPE loc
= this->get_location();
2187 _mesa_glsl_error(& loc
, state
, "main() must return void");
2190 if (!hir_parameters
.is_empty()) {
2191 YYLTYPE loc
= this->get_location();
2193 _mesa_glsl_error(& loc
, state
, "main() must not take any parameters");
2197 /* Finish storing the information about this new function in its signature.
2200 sig
= new(ctx
) ir_function_signature(return_type
);
2201 f
->add_signature(sig
);
2204 sig
->replace_parameters(&hir_parameters
);
2207 /* Function declarations (prototypes) do not have r-values.
2214 ast_function_definition::hir(exec_list
*instructions
,
2215 struct _mesa_glsl_parse_state
*state
)
2217 prototype
->is_definition
= true;
2218 prototype
->hir(instructions
, state
);
2220 ir_function_signature
*signature
= prototype
->signature
;
2222 assert(state
->current_function
== NULL
);
2223 state
->current_function
= signature
;
2224 state
->found_return
= false;
2226 /* Duplicate parameters declared in the prototype as concrete variables.
2227 * Add these to the symbol table.
2229 state
->symbols
->push_scope();
2230 foreach_iter(exec_list_iterator
, iter
, signature
->parameters
) {
2231 ir_variable
*const var
= ((ir_instruction
*) iter
.get())->as_variable();
2233 assert(var
!= NULL
);
2235 /* The only way a parameter would "exist" is if two parameters have
2238 if (state
->symbols
->name_declared_this_scope(var
->name
)) {
2239 YYLTYPE loc
= this->get_location();
2241 _mesa_glsl_error(& loc
, state
, "parameter `%s' redeclared", var
->name
);
2243 state
->symbols
->add_variable(var
->name
, var
);
2247 /* Convert the body of the function to HIR. */
2248 this->body
->hir(&signature
->body
, state
);
2249 signature
->is_defined
= true;
2251 state
->symbols
->pop_scope();
2253 assert(state
->current_function
== signature
);
2254 state
->current_function
= NULL
;
2256 if (!signature
->return_type
->is_void() && !state
->found_return
) {
2257 YYLTYPE loc
= this->get_location();
2258 _mesa_glsl_error(& loc
, state
, "function `%s' has non-void return type "
2259 "%s, but no return statement",
2260 signature
->function_name(),
2261 signature
->return_type
->name
);
2264 /* Function definitions do not have r-values.
2271 ast_jump_statement::hir(exec_list
*instructions
,
2272 struct _mesa_glsl_parse_state
*state
)
2279 assert(state
->current_function
);
2281 if (opt_return_value
) {
2282 if (state
->current_function
->return_type
->base_type
==
2284 YYLTYPE loc
= this->get_location();
2286 _mesa_glsl_error(& loc
, state
,
2287 "`return` with a value, in function `%s' "
2289 state
->current_function
->function_name());
2292 ir_expression
*const ret
= (ir_expression
*)
2293 opt_return_value
->hir(instructions
, state
);
2294 assert(ret
!= NULL
);
2296 /* Implicit conversions are not allowed for return values. */
2297 if (state
->current_function
->return_type
!= ret
->type
) {
2298 YYLTYPE loc
= this->get_location();
2300 _mesa_glsl_error(& loc
, state
,
2301 "`return' with wrong type %s, in function `%s' "
2304 state
->current_function
->function_name(),
2305 state
->current_function
->return_type
->name
);
2308 inst
= new(ctx
) ir_return(ret
);
2310 if (state
->current_function
->return_type
->base_type
!=
2312 YYLTYPE loc
= this->get_location();
2314 _mesa_glsl_error(& loc
, state
,
2315 "`return' with no value, in function %s returning "
2317 state
->current_function
->function_name());
2319 inst
= new(ctx
) ir_return
;
2322 state
->found_return
= true;
2323 instructions
->push_tail(inst
);
2328 if (state
->target
!= fragment_shader
) {
2329 YYLTYPE loc
= this->get_location();
2331 _mesa_glsl_error(& loc
, state
,
2332 "`discard' may only appear in a fragment shader");
2334 instructions
->push_tail(new(ctx
) ir_discard
);
2339 /* FINISHME: Handle switch-statements. They cannot contain 'continue',
2340 * FINISHME: and they use a different IR instruction for 'break'.
2342 /* FINISHME: Correctly handle the nesting. If a switch-statement is
2343 * FINISHME: inside a loop, a 'continue' is valid and will bind to the
2346 if (state
->loop_or_switch_nesting
== NULL
) {
2347 YYLTYPE loc
= this->get_location();
2349 _mesa_glsl_error(& loc
, state
,
2350 "`%s' may only appear in a loop",
2351 (mode
== ast_break
) ? "break" : "continue");
2353 ir_loop
*const loop
= state
->loop_or_switch_nesting
->as_loop();
2355 /* Inline the for loop expression again, since we don't know
2356 * where near the end of the loop body the normal copy of it
2357 * is going to be placed.
2359 if (mode
== ast_continue
&&
2360 state
->loop_or_switch_nesting_ast
->rest_expression
) {
2361 state
->loop_or_switch_nesting_ast
->rest_expression
->hir(instructions
,
2366 ir_loop_jump
*const jump
=
2367 new(ctx
) ir_loop_jump((mode
== ast_break
)
2368 ? ir_loop_jump::jump_break
2369 : ir_loop_jump::jump_continue
);
2370 instructions
->push_tail(jump
);
2377 /* Jump instructions do not have r-values.
2384 ast_selection_statement::hir(exec_list
*instructions
,
2385 struct _mesa_glsl_parse_state
*state
)
2389 ir_rvalue
*const condition
= this->condition
->hir(instructions
, state
);
2391 /* From page 66 (page 72 of the PDF) of the GLSL 1.50 spec:
2393 * "Any expression whose type evaluates to a Boolean can be used as the
2394 * conditional expression bool-expression. Vector types are not accepted
2395 * as the expression to if."
2397 * The checks are separated so that higher quality diagnostics can be
2398 * generated for cases where both rules are violated.
2400 if (!condition
->type
->is_boolean() || !condition
->type
->is_scalar()) {
2401 YYLTYPE loc
= this->condition
->get_location();
2403 _mesa_glsl_error(& loc
, state
, "if-statement condition must be scalar "
2407 ir_if
*const stmt
= new(ctx
) ir_if(condition
);
2409 if (then_statement
!= NULL
)
2410 then_statement
->hir(& stmt
->then_instructions
, state
);
2412 if (else_statement
!= NULL
)
2413 else_statement
->hir(& stmt
->else_instructions
, state
);
2415 instructions
->push_tail(stmt
);
2417 /* if-statements do not have r-values.
2424 ast_iteration_statement::condition_to_hir(ir_loop
*stmt
,
2425 struct _mesa_glsl_parse_state
*state
)
2429 if (condition
!= NULL
) {
2430 ir_rvalue
*const cond
=
2431 condition
->hir(& stmt
->body_instructions
, state
);
2434 || !cond
->type
->is_boolean() || !cond
->type
->is_scalar()) {
2435 YYLTYPE loc
= condition
->get_location();
2437 _mesa_glsl_error(& loc
, state
,
2438 "loop condition must be scalar boolean");
2440 /* As the first code in the loop body, generate a block that looks
2441 * like 'if (!condition) break;' as the loop termination condition.
2443 ir_rvalue
*const not_cond
=
2444 new(ctx
) ir_expression(ir_unop_logic_not
, glsl_type::bool_type
, cond
,
2447 ir_if
*const if_stmt
= new(ctx
) ir_if(not_cond
);
2449 ir_jump
*const break_stmt
=
2450 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
2452 if_stmt
->then_instructions
.push_tail(break_stmt
);
2453 stmt
->body_instructions
.push_tail(if_stmt
);
2460 ast_iteration_statement::hir(exec_list
*instructions
,
2461 struct _mesa_glsl_parse_state
*state
)
2465 /* For-loops and while-loops start a new scope, but do-while loops do not.
2467 if (mode
!= ast_do_while
)
2468 state
->symbols
->push_scope();
2470 if (init_statement
!= NULL
)
2471 init_statement
->hir(instructions
, state
);
2473 ir_loop
*const stmt
= new(ctx
) ir_loop();
2474 instructions
->push_tail(stmt
);
2476 /* Track the current loop and / or switch-statement nesting.
2478 ir_instruction
*const nesting
= state
->loop_or_switch_nesting
;
2479 ast_iteration_statement
*nesting_ast
= state
->loop_or_switch_nesting_ast
;
2481 state
->loop_or_switch_nesting
= stmt
;
2482 state
->loop_or_switch_nesting_ast
= this;
2484 if (mode
!= ast_do_while
)
2485 condition_to_hir(stmt
, state
);
2488 body
->hir(& stmt
->body_instructions
, state
);
2490 if (rest_expression
!= NULL
)
2491 rest_expression
->hir(& stmt
->body_instructions
, state
);
2493 if (mode
== ast_do_while
)
2494 condition_to_hir(stmt
, state
);
2496 if (mode
!= ast_do_while
)
2497 state
->symbols
->pop_scope();
2499 /* Restore previous nesting before returning.
2501 state
->loop_or_switch_nesting
= nesting
;
2502 state
->loop_or_switch_nesting_ast
= nesting_ast
;
2504 /* Loops do not have r-values.
2511 ast_type_specifier::hir(exec_list
*instructions
,
2512 struct _mesa_glsl_parse_state
*state
)
2514 if (this->structure
!= NULL
)
2515 return this->structure
->hir(instructions
, state
);
2522 ast_struct_specifier::hir(exec_list
*instructions
,
2523 struct _mesa_glsl_parse_state
*state
)
2525 unsigned decl_count
= 0;
2527 /* Make an initial pass over the list of structure fields to determine how
2528 * many there are. Each element in this list is an ast_declarator_list.
2529 * This means that we actually need to count the number of elements in the
2530 * 'declarations' list in each of the elements.
2532 foreach_list_typed (ast_declarator_list
, decl_list
, link
,
2533 &this->declarations
) {
2534 foreach_list_const (decl_ptr
, & decl_list
->declarations
) {
2540 /* Allocate storage for the structure fields and process the field
2541 * declarations. As the declarations are processed, try to also convert
2542 * the types to HIR. This ensures that structure definitions embedded in
2543 * other structure definitions are processed.
2545 glsl_struct_field
*const fields
= talloc_array(state
, glsl_struct_field
,
2549 foreach_list_typed (ast_declarator_list
, decl_list
, link
,
2550 &this->declarations
) {
2551 const char *type_name
;
2553 decl_list
->type
->specifier
->hir(instructions
, state
);
2555 const glsl_type
*decl_type
=
2556 decl_list
->type
->specifier
->glsl_type(& type_name
, state
);
2558 foreach_list_typed (ast_declaration
, decl
, link
,
2559 &decl_list
->declarations
) {
2560 const struct glsl_type
*const field_type
=
2562 ? process_array_type(decl_type
, decl
->array_size
, state
)
2565 fields
[i
].type
= (field_type
!= NULL
)
2566 ? field_type
: glsl_type::error_type
;
2567 fields
[i
].name
= decl
->identifier
;
2572 assert(i
== decl_count
);
2575 if (this->name
== NULL
) {
2576 static unsigned anon_count
= 1;
2579 snprintf(buf
, sizeof(buf
), "#anon_struct_%04x", anon_count
);
2587 const glsl_type
*t
=
2588 glsl_type::get_record_instance(fields
, decl_count
, name
);
2590 YYLTYPE loc
= this->get_location();
2591 if (!state
->symbols
->add_type(name
, t
)) {
2592 _mesa_glsl_error(& loc
, state
, "struct `%s' previously defined", name
);
2594 /* This logic is a bit tricky. It is an error to declare a structure at
2595 * global scope if there is also a function with the same name.
2597 if ((state
->current_function
== NULL
)
2598 && (state
->symbols
->get_function(name
) != NULL
)) {
2599 _mesa_glsl_error(& loc
, state
, "name `%s' previously defined", name
);
2601 t
->generate_constructor(state
->symbols
);
2604 const glsl_type
**s
= (const glsl_type
**)
2605 realloc(state
->user_structures
,
2606 sizeof(state
->user_structures
[0]) *
2607 (state
->num_user_structures
+ 1));
2609 s
[state
->num_user_structures
] = t
;
2610 state
->user_structures
= s
;
2611 state
->num_user_structures
++;
2615 /* Structure type definitions do not have r-values.