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 "glsl_symbol_table.h"
54 #include "glsl_parser_extras.h"
56 #include "glsl_types.h"
60 _mesa_ast_to_hir(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
)
62 _mesa_glsl_initialize_variables(instructions
, state
);
63 _mesa_glsl_initialize_functions(instructions
, state
);
65 state
->current_function
= NULL
;
67 foreach_list_typed (ast_node
, ast
, link
, & state
->translation_unit
)
68 ast
->hir(instructions
, state
);
73 * If a conversion is available, convert one operand to a different type
75 * The \c from \c ir_rvalue is converted "in place".
77 * \param to Type that the operand it to be converted to
78 * \param from Operand that is being converted
79 * \param state GLSL compiler state
82 * If a conversion is possible (or unnecessary), \c true is returned.
83 * Otherwise \c false is returned.
86 apply_implicit_conversion(const glsl_type
*to
, ir_rvalue
* &from
,
87 struct _mesa_glsl_parse_state
*state
)
90 if (to
->base_type
== from
->type
->base_type
)
93 /* This conversion was added in GLSL 1.20. If the compilation mode is
94 * GLSL 1.10, the conversion is skipped.
96 if (state
->language_version
< 120)
99 /* From page 27 (page 33 of the PDF) of the GLSL 1.50 spec:
101 * "There are no implicit array or structure conversions. For
102 * example, an array of int cannot be implicitly converted to an
103 * array of float. There are no implicit conversions between
104 * signed and unsigned integers."
106 /* FINISHME: The above comment is partially a lie. There is int/uint
107 * FINISHME: conversion for immediate constants.
109 if (!to
->is_float() || !from
->type
->is_numeric())
112 /* Convert to a floating point type with the same number of components
113 * as the original type - i.e. int to float, not int to vec4.
115 to
= glsl_type::get_instance(GLSL_TYPE_FLOAT
, from
->type
->vector_elements
,
116 from
->type
->matrix_columns
);
118 switch (from
->type
->base_type
) {
120 from
= new(ctx
) ir_expression(ir_unop_i2f
, to
, from
, NULL
);
123 from
= new(ctx
) ir_expression(ir_unop_u2f
, to
, from
, NULL
);
126 from
= new(ctx
) ir_expression(ir_unop_b2f
, to
, from
, NULL
);
136 static const struct glsl_type
*
137 arithmetic_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
139 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
141 const glsl_type
*type_a
= value_a
->type
;
142 const glsl_type
*type_b
= value_b
->type
;
144 /* From GLSL 1.50 spec, page 56:
146 * "The arithmetic binary operators add (+), subtract (-),
147 * multiply (*), and divide (/) operate on integer and
148 * floating-point scalars, vectors, and matrices."
150 if (!type_a
->is_numeric() || !type_b
->is_numeric()) {
151 _mesa_glsl_error(loc
, state
,
152 "Operands to arithmetic operators must be numeric");
153 return glsl_type::error_type
;
157 /* "If one operand is floating-point based and the other is
158 * not, then the conversions from Section 4.1.10 "Implicit
159 * Conversions" are applied to the non-floating-point-based operand."
161 if (!apply_implicit_conversion(type_a
, value_b
, state
)
162 && !apply_implicit_conversion(type_b
, value_a
, state
)) {
163 _mesa_glsl_error(loc
, state
,
164 "Could not implicitly convert operands to "
165 "arithmetic operator");
166 return glsl_type::error_type
;
168 type_a
= value_a
->type
;
169 type_b
= value_b
->type
;
171 /* "If the operands are integer types, they must both be signed or
174 * From this rule and the preceeding conversion it can be inferred that
175 * both types must be GLSL_TYPE_FLOAT, or GLSL_TYPE_UINT, or GLSL_TYPE_INT.
176 * The is_numeric check above already filtered out the case where either
177 * type is not one of these, so now the base types need only be tested for
180 if (type_a
->base_type
!= type_b
->base_type
) {
181 _mesa_glsl_error(loc
, state
,
182 "base type mismatch for arithmetic operator");
183 return glsl_type::error_type
;
186 /* "All arithmetic binary operators result in the same fundamental type
187 * (signed integer, unsigned integer, or floating-point) as the
188 * operands they operate on, after operand type conversion. After
189 * conversion, the following cases are valid
191 * * The two operands are scalars. In this case the operation is
192 * applied, resulting in a scalar."
194 if (type_a
->is_scalar() && type_b
->is_scalar())
197 /* "* One operand is a scalar, and the other is a vector or matrix.
198 * In this case, the scalar operation is applied independently to each
199 * component of the vector or matrix, resulting in the same size
202 if (type_a
->is_scalar()) {
203 if (!type_b
->is_scalar())
205 } else if (type_b
->is_scalar()) {
209 /* All of the combinations of <scalar, scalar>, <vector, scalar>,
210 * <scalar, vector>, <scalar, matrix>, and <matrix, scalar> have been
213 assert(!type_a
->is_scalar());
214 assert(!type_b
->is_scalar());
216 /* "* The two operands are vectors of the same size. In this case, the
217 * operation is done component-wise resulting in the same size
220 if (type_a
->is_vector() && type_b
->is_vector()) {
221 if (type_a
== type_b
) {
224 _mesa_glsl_error(loc
, state
,
225 "vector size mismatch for arithmetic operator");
226 return glsl_type::error_type
;
230 /* All of the combinations of <scalar, scalar>, <vector, scalar>,
231 * <scalar, vector>, <scalar, matrix>, <matrix, scalar>, and
232 * <vector, vector> have been handled. At least one of the operands must
233 * be matrix. Further, since there are no integer matrix types, the base
234 * type of both operands must be float.
236 assert(type_a
->is_matrix() || type_b
->is_matrix());
237 assert(type_a
->base_type
== GLSL_TYPE_FLOAT
);
238 assert(type_b
->base_type
== GLSL_TYPE_FLOAT
);
240 /* "* The operator is add (+), subtract (-), or divide (/), and the
241 * operands are matrices with the same number of rows and the same
242 * number of columns. In this case, the operation is done component-
243 * wise resulting in the same size matrix."
244 * * The operator is multiply (*), where both operands are matrices or
245 * one operand is a vector and the other a matrix. A right vector
246 * operand is treated as a column vector and a left vector operand as a
247 * row vector. In all these cases, it is required that the number of
248 * columns of the left operand is equal to the number of rows of the
249 * right operand. Then, the multiply (*) operation does a linear
250 * algebraic multiply, yielding an object that has the same number of
251 * rows as the left operand and the same number of columns as the right
252 * operand. Section 5.10 "Vector and Matrix Operations" explains in
253 * more detail how vectors and matrices are operated on."
256 if (type_a
== type_b
)
259 if (type_a
->is_matrix() && type_b
->is_matrix()) {
260 /* Matrix multiply. The columns of A must match the rows of B. Given
261 * the other previously tested constraints, this means the vector type
262 * of a row from A must be the same as the vector type of a column from
265 if (type_a
->row_type() == type_b
->column_type()) {
266 /* The resulting matrix has the number of columns of matrix B and
267 * the number of rows of matrix A. We get the row count of A by
268 * looking at the size of a vector that makes up a column. The
269 * transpose (size of a row) is done for B.
271 const glsl_type
*const type
=
272 glsl_type::get_instance(type_a
->base_type
,
273 type_a
->column_type()->vector_elements
,
274 type_b
->row_type()->vector_elements
);
275 assert(type
!= glsl_type::error_type
);
279 } else if (type_a
->is_matrix()) {
280 /* A is a matrix and B is a column vector. Columns of A must match
281 * rows of B. Given the other previously tested constraints, this
282 * means the vector type of a row from A must be the same as the
283 * vector the type of B.
285 if (type_a
->row_type() == type_b
) {
286 /* The resulting vector has a number of elements equal to
287 * the number of rows of matrix A. */
288 const glsl_type
*const type
=
289 glsl_type::get_instance(type_a
->base_type
,
290 type_a
->column_type()->vector_elements
,
292 assert(type
!= glsl_type::error_type
);
297 assert(type_b
->is_matrix());
299 /* A is a row vector and B is a matrix. Columns of A must match rows
300 * of B. Given the other previously tested constraints, this means
301 * the type of A must be the same as the vector type of a column from
304 if (type_a
== type_b
->column_type()) {
305 /* The resulting vector has a number of elements equal to
306 * the number of columns of matrix B. */
307 const glsl_type
*const type
=
308 glsl_type::get_instance(type_a
->base_type
,
309 type_b
->row_type()->vector_elements
,
311 assert(type
!= glsl_type::error_type
);
317 _mesa_glsl_error(loc
, state
, "size mismatch for matrix multiplication");
318 return glsl_type::error_type
;
322 /* "All other cases are illegal."
324 _mesa_glsl_error(loc
, state
, "type mismatch");
325 return glsl_type::error_type
;
329 static const struct glsl_type
*
330 unary_arithmetic_result_type(const struct glsl_type
*type
,
331 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
333 /* From GLSL 1.50 spec, page 57:
335 * "The arithmetic unary operators negate (-), post- and pre-increment
336 * and decrement (-- and ++) operate on integer or floating-point
337 * values (including vectors and matrices). All unary operators work
338 * component-wise on their operands. These result with the same type
341 if (!type
->is_numeric()) {
342 _mesa_glsl_error(loc
, state
,
343 "Operands to arithmetic operators must be numeric");
344 return glsl_type::error_type
;
351 static const struct glsl_type
*
352 modulus_result_type(const struct glsl_type
*type_a
,
353 const struct glsl_type
*type_b
,
354 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
356 /* From GLSL 1.50 spec, page 56:
357 * "The operator modulus (%) operates on signed or unsigned integers or
358 * integer vectors. The operand types must both be signed or both be
361 if (!type_a
->is_integer() || !type_b
->is_integer()
362 || (type_a
->base_type
!= type_b
->base_type
)) {
363 _mesa_glsl_error(loc
, state
, "type mismatch");
364 return glsl_type::error_type
;
367 /* "The operands cannot be vectors of differing size. If one operand is
368 * a scalar and the other vector, then the scalar is applied component-
369 * wise to the vector, resulting in the same type as the vector. If both
370 * are vectors of the same size, the result is computed component-wise."
372 if (type_a
->is_vector()) {
373 if (!type_b
->is_vector()
374 || (type_a
->vector_elements
== type_b
->vector_elements
))
379 /* "The operator modulus (%) is not defined for any other data types
380 * (non-integer types)."
382 _mesa_glsl_error(loc
, state
, "type mismatch");
383 return glsl_type::error_type
;
387 static const struct glsl_type
*
388 relational_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
389 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
391 const glsl_type
*type_a
= value_a
->type
;
392 const glsl_type
*type_b
= value_b
->type
;
394 /* From GLSL 1.50 spec, page 56:
395 * "The relational operators greater than (>), less than (<), greater
396 * than or equal (>=), and less than or equal (<=) operate only on
397 * scalar integer and scalar floating-point expressions."
399 if (!type_a
->is_numeric()
400 || !type_b
->is_numeric()
401 || !type_a
->is_scalar()
402 || !type_b
->is_scalar()) {
403 _mesa_glsl_error(loc
, state
,
404 "Operands to relational operators must be scalar and "
406 return glsl_type::error_type
;
409 /* "Either the operands' types must match, or the conversions from
410 * Section 4.1.10 "Implicit Conversions" will be applied to the integer
411 * operand, after which the types must match."
413 if (!apply_implicit_conversion(type_a
, value_b
, state
)
414 && !apply_implicit_conversion(type_b
, value_a
, state
)) {
415 _mesa_glsl_error(loc
, state
,
416 "Could not implicitly convert operands to "
417 "relational operator");
418 return glsl_type::error_type
;
420 type_a
= value_a
->type
;
421 type_b
= value_b
->type
;
423 if (type_a
->base_type
!= type_b
->base_type
) {
424 _mesa_glsl_error(loc
, state
, "base type mismatch");
425 return glsl_type::error_type
;
428 /* "The result is scalar Boolean."
430 return glsl_type::bool_type
;
435 * Validates that a value can be assigned to a location with a specified type
437 * Validates that \c rhs can be assigned to some location. If the types are
438 * not an exact match but an automatic conversion is possible, \c rhs will be
442 * \c NULL if \c rhs cannot be assigned to a location with type \c lhs_type.
443 * Otherwise the actual RHS to be assigned will be returned. This may be
444 * \c rhs, or it may be \c rhs after some type conversion.
447 * In addition to being used for assignments, this function is used to
448 * type-check return values.
451 validate_assignment(struct _mesa_glsl_parse_state
*state
,
452 const glsl_type
*lhs_type
, ir_rvalue
*rhs
)
454 const glsl_type
*rhs_type
= rhs
->type
;
456 /* If there is already some error in the RHS, just return it. Anything
457 * else will lead to an avalanche of error message back to the user.
459 if (rhs_type
->is_error())
462 /* If the types are identical, the assignment can trivially proceed.
464 if (rhs_type
== lhs_type
)
467 /* If the array element types are the same and the size of the LHS is zero,
468 * the assignment is okay.
470 * Note: Whole-array assignments are not permitted in GLSL 1.10, but this
471 * is handled by ir_dereference::is_lvalue.
473 if (lhs_type
->is_array() && rhs
->type
->is_array()
474 && (lhs_type
->element_type() == rhs
->type
->element_type())
475 && (lhs_type
->array_size() == 0)) {
479 /* Check for implicit conversion in GLSL 1.20 */
480 if (apply_implicit_conversion(lhs_type
, rhs
, state
)) {
481 rhs_type
= rhs
->type
;
482 if (rhs_type
== lhs_type
)
490 do_assignment(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
,
491 ir_rvalue
*lhs
, ir_rvalue
*rhs
,
495 bool error_emitted
= (lhs
->type
->is_error() || rhs
->type
->is_error());
497 if (!error_emitted
) {
498 /* FINISHME: This does not handle 'foo.bar.a.b.c[5].d = 5' */
499 if (!lhs
->is_lvalue()) {
500 _mesa_glsl_error(& lhs_loc
, state
, "non-lvalue in assignment");
501 error_emitted
= true;
505 ir_rvalue
*new_rhs
= validate_assignment(state
, lhs
->type
, rhs
);
506 if (new_rhs
== NULL
) {
507 _mesa_glsl_error(& lhs_loc
, state
, "type mismatch");
511 /* If the LHS array was not declared with a size, it takes it size from
512 * the RHS. If the LHS is an l-value and a whole array, it must be a
513 * dereference of a variable. Any other case would require that the LHS
514 * is either not an l-value or not a whole array.
516 if (lhs
->type
->array_size() == 0) {
517 ir_dereference
*const d
= lhs
->as_dereference();
521 ir_variable
*const var
= d
->variable_referenced();
525 if (var
->max_array_access
>= unsigned(rhs
->type
->array_size())) {
526 /* FINISHME: This should actually log the location of the RHS. */
527 _mesa_glsl_error(& lhs_loc
, state
, "array size must be > %u due to "
529 var
->max_array_access
);
532 var
->type
= glsl_type::get_array_instance(lhs
->type
->element_type(),
533 rhs
->type
->array_size());
538 /* Most callers of do_assignment (assign, add_assign, pre_inc/dec,
539 * but not post_inc) need the converted assigned value as an rvalue
540 * to handle things like:
544 * So we always just store the computed value being assigned to a
545 * temporary and return a deref of that temporary. If the rvalue
546 * ends up not being used, the temp will get copy-propagated out.
548 ir_variable
*var
= new(ctx
) ir_variable(rhs
->type
, "assignment_tmp",
550 ir_dereference_variable
*deref_var
= new(ctx
) ir_dereference_variable(var
);
551 instructions
->push_tail(var
);
552 instructions
->push_tail(new(ctx
) ir_assignment(deref_var
,
555 deref_var
= new(ctx
) ir_dereference_variable(var
);
557 instructions
->push_tail(new(ctx
) ir_assignment(lhs
,
561 return new(ctx
) ir_dereference_variable(var
);
565 get_lvalue_copy(exec_list
*instructions
, ir_rvalue
*lvalue
)
567 void *ctx
= talloc_parent(lvalue
);
570 /* FINISHME: Give unique names to the temporaries. */
571 var
= new(ctx
) ir_variable(lvalue
->type
, "_post_incdec_tmp",
573 instructions
->push_tail(var
);
574 var
->mode
= ir_var_auto
;
576 instructions
->push_tail(new(ctx
) ir_assignment(new(ctx
) ir_dereference_variable(var
),
579 /* Once we've created this temporary, mark it read only so it's no
580 * longer considered an lvalue.
582 var
->read_only
= true;
584 return new(ctx
) ir_dereference_variable(var
);
589 ast_node::hir(exec_list
*instructions
,
590 struct _mesa_glsl_parse_state
*state
)
600 ast_expression::hir(exec_list
*instructions
,
601 struct _mesa_glsl_parse_state
*state
)
604 static const int operations
[AST_NUM_OPERATORS
] = {
605 -1, /* ast_assign doesn't convert to ir_expression. */
606 -1, /* ast_plus doesn't convert to ir_expression. */
630 /* Note: The following block of expression types actually convert
631 * to multiple IR instructions.
633 ir_binop_mul
, /* ast_mul_assign */
634 ir_binop_div
, /* ast_div_assign */
635 ir_binop_mod
, /* ast_mod_assign */
636 ir_binop_add
, /* ast_add_assign */
637 ir_binop_sub
, /* ast_sub_assign */
638 ir_binop_lshift
, /* ast_ls_assign */
639 ir_binop_rshift
, /* ast_rs_assign */
640 ir_binop_bit_and
, /* ast_and_assign */
641 ir_binop_bit_xor
, /* ast_xor_assign */
642 ir_binop_bit_or
, /* ast_or_assign */
644 -1, /* ast_conditional doesn't convert to ir_expression. */
645 ir_binop_add
, /* ast_pre_inc. */
646 ir_binop_sub
, /* ast_pre_dec. */
647 ir_binop_add
, /* ast_post_inc. */
648 ir_binop_sub
, /* ast_post_dec. */
649 -1, /* ast_field_selection doesn't conv to ir_expression. */
650 -1, /* ast_array_index doesn't convert to ir_expression. */
651 -1, /* ast_function_call doesn't conv to ir_expression. */
652 -1, /* ast_identifier doesn't convert to ir_expression. */
653 -1, /* ast_int_constant doesn't convert to ir_expression. */
654 -1, /* ast_uint_constant doesn't conv to ir_expression. */
655 -1, /* ast_float_constant doesn't conv to ir_expression. */
656 -1, /* ast_bool_constant doesn't conv to ir_expression. */
657 -1, /* ast_sequence doesn't convert to ir_expression. */
659 ir_rvalue
*result
= NULL
;
661 const struct glsl_type
*type
= glsl_type::error_type
;
662 bool error_emitted
= false;
665 loc
= this->get_location();
667 switch (this->oper
) {
669 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
670 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
672 result
= do_assignment(instructions
, state
, op
[0], op
[1],
673 this->subexpressions
[0]->get_location());
674 error_emitted
= result
->type
->is_error();
680 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
682 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
684 error_emitted
= type
->is_error();
690 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
692 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
694 error_emitted
= type
->is_error();
696 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
704 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
705 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
707 type
= arithmetic_result_type(op
[0], op
[1],
708 (this->oper
== ast_mul
),
710 error_emitted
= type
->is_error();
712 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
717 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
718 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
720 type
= modulus_result_type(op
[0]->type
, op
[1]->type
, state
, & loc
);
722 assert(operations
[this->oper
] == ir_binop_mod
);
724 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
726 error_emitted
= type
->is_error();
731 _mesa_glsl_error(& loc
, state
, "FINISHME: implement bit-shift operators");
732 error_emitted
= true;
739 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
740 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
742 type
= relational_result_type(op
[0], op
[1], state
, & loc
);
744 /* The relational operators must either generate an error or result
745 * in a scalar boolean. See page 57 of the GLSL 1.50 spec.
747 assert(type
->is_error()
748 || ((type
->base_type
== GLSL_TYPE_BOOL
)
749 && type
->is_scalar()));
751 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
753 error_emitted
= type
->is_error();
758 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
759 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
761 /* From page 58 (page 64 of the PDF) of the GLSL 1.50 spec:
763 * "The equality operators equal (==), and not equal (!=)
764 * operate on all types. They result in a scalar Boolean. If
765 * the operand types do not match, then there must be a
766 * conversion from Section 4.1.10 "Implicit Conversions"
767 * applied to one operand that can make them match, in which
768 * case this conversion is done."
770 if ((!apply_implicit_conversion(op
[0]->type
, op
[1], state
)
771 && !apply_implicit_conversion(op
[1]->type
, op
[0], state
))
772 || (op
[0]->type
!= op
[1]->type
)) {
773 _mesa_glsl_error(& loc
, state
, "operands of `%s' must have the same "
774 "type", (this->oper
== ast_equal
) ? "==" : "!=");
775 error_emitted
= true;
776 } else if ((state
->language_version
<= 110)
777 && (op
[0]->type
->is_array() || op
[1]->type
->is_array())) {
778 _mesa_glsl_error(& loc
, state
, "array comparisons forbidden in "
780 error_emitted
= true;
783 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
785 type
= glsl_type::bool_type
;
787 assert(result
->type
== glsl_type::bool_type
);
794 _mesa_glsl_error(& loc
, state
, "FINISHME: implement bit-wise operators");
795 error_emitted
= true;
798 case ast_logic_and
: {
799 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
801 if (!op
[0]->type
->is_boolean() || !op
[0]->type
->is_scalar()) {
802 YYLTYPE loc
= this->subexpressions
[0]->get_location();
804 _mesa_glsl_error(& loc
, state
, "LHS of `%s' must be scalar boolean",
805 operator_string(this->oper
));
806 error_emitted
= true;
809 ir_constant
*op0_const
= op
[0]->constant_expression_value();
811 if (op0_const
->value
.b
[0]) {
812 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
814 if (!op
[1]->type
->is_boolean() || !op
[1]->type
->is_scalar()) {
815 YYLTYPE loc
= this->subexpressions
[1]->get_location();
817 _mesa_glsl_error(& loc
, state
,
818 "RHS of `%s' must be scalar boolean",
819 operator_string(this->oper
));
820 error_emitted
= true;
826 type
= glsl_type::bool_type
;
828 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
831 instructions
->push_tail(tmp
);
833 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
834 instructions
->push_tail(stmt
);
836 op
[1] = this->subexpressions
[1]->hir(&stmt
->then_instructions
, state
);
838 if (!op
[1]->type
->is_boolean() || !op
[1]->type
->is_scalar()) {
839 YYLTYPE loc
= this->subexpressions
[1]->get_location();
841 _mesa_glsl_error(& loc
, state
,
842 "RHS of `%s' must be scalar boolean",
843 operator_string(this->oper
));
844 error_emitted
= true;
847 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
848 ir_assignment
*const then_assign
=
849 new(ctx
) ir_assignment(then_deref
, op
[1], NULL
);
850 stmt
->then_instructions
.push_tail(then_assign
);
852 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
853 ir_assignment
*const else_assign
=
854 new(ctx
) ir_assignment(else_deref
, new(ctx
) ir_constant(false), NULL
);
855 stmt
->else_instructions
.push_tail(else_assign
);
857 result
= new(ctx
) ir_dereference_variable(tmp
);
864 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
866 if (!op
[0]->type
->is_boolean() || !op
[0]->type
->is_scalar()) {
867 YYLTYPE loc
= this->subexpressions
[0]->get_location();
869 _mesa_glsl_error(& loc
, state
, "LHS of `%s' must be scalar boolean",
870 operator_string(this->oper
));
871 error_emitted
= true;
874 ir_constant
*op0_const
= op
[0]->constant_expression_value();
876 if (op0_const
->value
.b
[0]) {
879 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
881 if (!op
[1]->type
->is_boolean() || !op
[1]->type
->is_scalar()) {
882 YYLTYPE loc
= this->subexpressions
[1]->get_location();
884 _mesa_glsl_error(& loc
, state
,
885 "RHS of `%s' must be scalar boolean",
886 operator_string(this->oper
));
887 error_emitted
= true;
891 type
= glsl_type::bool_type
;
893 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
896 instructions
->push_tail(tmp
);
898 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
899 instructions
->push_tail(stmt
);
901 op
[1] = this->subexpressions
[1]->hir(&stmt
->then_instructions
, state
);
903 if (!op
[1]->type
->is_boolean() || !op
[1]->type
->is_scalar()) {
904 YYLTYPE loc
= this->subexpressions
[1]->get_location();
906 _mesa_glsl_error(& loc
, state
, "RHS of `%s' must be scalar boolean",
907 operator_string(this->oper
));
908 error_emitted
= true;
911 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
912 ir_assignment
*const then_assign
=
913 new(ctx
) ir_assignment(then_deref
, new(ctx
) ir_constant(true), NULL
);
914 stmt
->then_instructions
.push_tail(then_assign
);
916 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
917 ir_assignment
*const else_assign
=
918 new(ctx
) ir_assignment(else_deref
, op
[1], NULL
);
919 stmt
->else_instructions
.push_tail(else_assign
);
921 result
= new(ctx
) ir_dereference_variable(tmp
);
928 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
929 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
932 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
934 type
= glsl_type::bool_type
;
938 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
940 if (!op
[0]->type
->is_boolean() || !op
[0]->type
->is_scalar()) {
941 YYLTYPE loc
= this->subexpressions
[0]->get_location();
943 _mesa_glsl_error(& loc
, state
,
944 "operand of `!' must be scalar boolean");
945 error_emitted
= true;
948 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
950 type
= glsl_type::bool_type
;
956 case ast_sub_assign
: {
957 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
958 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
960 type
= arithmetic_result_type(op
[0], op
[1],
961 (this->oper
== ast_mul_assign
),
964 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
967 result
= do_assignment(instructions
, state
,
968 op
[0]->clone(NULL
), temp_rhs
,
969 this->subexpressions
[0]->get_location());
971 error_emitted
= (op
[0]->type
->is_error());
973 /* GLSL 1.10 does not allow array assignment. However, we don't have to
974 * explicitly test for this because none of the binary expression
975 * operators allow array operands either.
981 case ast_mod_assign
: {
982 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
983 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
985 type
= modulus_result_type(op
[0]->type
, op
[1]->type
, state
, & loc
);
987 assert(operations
[this->oper
] == ir_binop_mod
);
989 struct ir_rvalue
*temp_rhs
;
990 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
993 result
= do_assignment(instructions
, state
,
994 op
[0]->clone(NULL
), temp_rhs
,
995 this->subexpressions
[0]->get_location());
997 error_emitted
= type
->is_error();
1003 _mesa_glsl_error(& loc
, state
,
1004 "FINISHME: implement bit-shift assignment operators");
1005 error_emitted
= true;
1008 case ast_and_assign
:
1009 case ast_xor_assign
:
1011 _mesa_glsl_error(& loc
, state
,
1012 "FINISHME: implement logic assignment operators");
1013 error_emitted
= true;
1016 case ast_conditional
: {
1017 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1019 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1021 * "The ternary selection operator (?:). It operates on three
1022 * expressions (exp1 ? exp2 : exp3). This operator evaluates the
1023 * first expression, which must result in a scalar Boolean."
1025 if (!op
[0]->type
->is_boolean() || !op
[0]->type
->is_scalar()) {
1026 YYLTYPE loc
= this->subexpressions
[0]->get_location();
1028 _mesa_glsl_error(& loc
, state
, "?: condition must be scalar boolean");
1029 error_emitted
= true;
1032 /* The :? operator is implemented by generating an anonymous temporary
1033 * followed by an if-statement. The last instruction in each branch of
1034 * the if-statement assigns a value to the anonymous temporary. This
1035 * temporary is the r-value of the expression.
1037 exec_list then_instructions
;
1038 exec_list else_instructions
;
1040 op
[1] = this->subexpressions
[1]->hir(&then_instructions
, state
);
1041 op
[2] = this->subexpressions
[2]->hir(&else_instructions
, state
);
1043 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1045 * "The second and third expressions can be any type, as
1046 * long their types match, or there is a conversion in
1047 * Section 4.1.10 "Implicit Conversions" that can be applied
1048 * to one of the expressions to make their types match. This
1049 * resulting matching type is the type of the entire
1052 if ((!apply_implicit_conversion(op
[1]->type
, op
[2], state
)
1053 && !apply_implicit_conversion(op
[2]->type
, op
[1], state
))
1054 || (op
[1]->type
!= op
[2]->type
)) {
1055 YYLTYPE loc
= this->subexpressions
[1]->get_location();
1057 _mesa_glsl_error(& loc
, state
, "Second and third operands of ?: "
1058 "operator must have matching types.");
1059 error_emitted
= true;
1060 type
= glsl_type::error_type
;
1065 ir_constant
*cond_val
= op
[0]->constant_expression_value();
1066 ir_constant
*then_val
= op
[1]->constant_expression_value();
1067 ir_constant
*else_val
= op
[2]->constant_expression_value();
1069 if (then_instructions
.is_empty()
1070 && else_instructions
.is_empty()
1071 && (cond_val
!= NULL
) && (then_val
!= NULL
) && (else_val
!= NULL
)) {
1072 result
= (cond_val
->value
.b
[0]) ? then_val
: else_val
;
1074 ir_variable
*const tmp
=
1075 new(ctx
) ir_variable(type
, "conditional_tmp", ir_var_temporary
);
1076 instructions
->push_tail(tmp
);
1078 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1079 instructions
->push_tail(stmt
);
1081 then_instructions
.move_nodes_to(& stmt
->then_instructions
);
1082 ir_dereference
*const then_deref
=
1083 new(ctx
) ir_dereference_variable(tmp
);
1084 ir_assignment
*const then_assign
=
1085 new(ctx
) ir_assignment(then_deref
, op
[1], NULL
);
1086 stmt
->then_instructions
.push_tail(then_assign
);
1088 else_instructions
.move_nodes_to(& stmt
->else_instructions
);
1089 ir_dereference
*const else_deref
=
1090 new(ctx
) ir_dereference_variable(tmp
);
1091 ir_assignment
*const else_assign
=
1092 new(ctx
) ir_assignment(else_deref
, op
[2], NULL
);
1093 stmt
->else_instructions
.push_tail(else_assign
);
1095 result
= new(ctx
) ir_dereference_variable(tmp
);
1102 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1103 if (op
[0]->type
->base_type
== GLSL_TYPE_FLOAT
)
1104 op
[1] = new(ctx
) ir_constant(1.0f
);
1106 op
[1] = new(ctx
) ir_constant(1);
1108 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1110 struct ir_rvalue
*temp_rhs
;
1111 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1114 result
= do_assignment(instructions
, state
,
1115 op
[0]->clone(NULL
), temp_rhs
,
1116 this->subexpressions
[0]->get_location());
1117 type
= result
->type
;
1118 error_emitted
= op
[0]->type
->is_error();
1123 case ast_post_dec
: {
1124 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1125 if (op
[0]->type
->base_type
== GLSL_TYPE_FLOAT
)
1126 op
[1] = new(ctx
) ir_constant(1.0f
);
1128 op
[1] = new(ctx
) ir_constant(1);
1130 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1132 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1134 struct ir_rvalue
*temp_rhs
;
1135 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1138 /* Get a temporary of a copy of the lvalue before it's modified.
1139 * This may get thrown away later.
1141 result
= get_lvalue_copy(instructions
, op
[0]->clone(NULL
));
1143 (void)do_assignment(instructions
, state
,
1144 op
[0]->clone(NULL
), temp_rhs
,
1145 this->subexpressions
[0]->get_location());
1147 type
= result
->type
;
1148 error_emitted
= op
[0]->type
->is_error();
1152 case ast_field_selection
:
1153 result
= _mesa_ast_field_selection_to_hir(this, instructions
, state
);
1154 type
= result
->type
;
1157 case ast_array_index
: {
1158 YYLTYPE index_loc
= subexpressions
[1]->get_location();
1160 op
[0] = subexpressions
[0]->hir(instructions
, state
);
1161 op
[1] = subexpressions
[1]->hir(instructions
, state
);
1163 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1165 ir_rvalue
*const array
= op
[0];
1167 result
= new(ctx
) ir_dereference_array(op
[0], op
[1]);
1169 /* Do not use op[0] after this point. Use array.
1177 if (!array
->type
->is_array()
1178 && !array
->type
->is_matrix()
1179 && !array
->type
->is_vector()) {
1180 _mesa_glsl_error(& index_loc
, state
,
1181 "cannot dereference non-array / non-matrix / "
1183 error_emitted
= true;
1186 if (!op
[1]->type
->is_integer()) {
1187 _mesa_glsl_error(& index_loc
, state
,
1188 "array index must be integer type");
1189 error_emitted
= true;
1190 } else if (!op
[1]->type
->is_scalar()) {
1191 _mesa_glsl_error(& index_loc
, state
,
1192 "array index must be scalar");
1193 error_emitted
= true;
1196 /* If the array index is a constant expression and the array has a
1197 * declared size, ensure that the access is in-bounds. If the array
1198 * index is not a constant expression, ensure that the array has a
1201 ir_constant
*const const_index
= op
[1]->constant_expression_value();
1202 if (const_index
!= NULL
) {
1203 const int idx
= const_index
->value
.i
[0];
1204 const char *type_name
;
1207 if (array
->type
->is_matrix()) {
1208 type_name
= "matrix";
1209 } else if (array
->type
->is_vector()) {
1210 type_name
= "vector";
1212 type_name
= "array";
1215 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec:
1217 * "It is illegal to declare an array with a size, and then
1218 * later (in the same shader) index the same array with an
1219 * integral constant expression greater than or equal to the
1220 * declared size. It is also illegal to index an array with a
1221 * negative constant expression."
1223 if (array
->type
->is_matrix()) {
1224 if (array
->type
->row_type()->vector_elements
<= idx
) {
1225 bound
= array
->type
->row_type()->vector_elements
;
1227 } else if (array
->type
->is_vector()) {
1228 if (array
->type
->vector_elements
<= idx
) {
1229 bound
= array
->type
->vector_elements
;
1232 if ((array
->type
->array_size() > 0)
1233 && (array
->type
->array_size() <= idx
)) {
1234 bound
= array
->type
->array_size();
1239 _mesa_glsl_error(& loc
, state
, "%s index must be < %u",
1241 error_emitted
= true;
1242 } else if (idx
< 0) {
1243 _mesa_glsl_error(& loc
, state
, "%s index must be >= 0",
1245 error_emitted
= true;
1248 if (array
->type
->is_array()) {
1249 /* If the array is a variable dereference, it dereferences the
1250 * whole array, by definition. Use this to get the variable.
1252 * FINISHME: Should some methods for getting / setting / testing
1253 * FINISHME: array access limits be added to ir_dereference?
1255 ir_variable
*const v
= array
->whole_variable_referenced();
1256 if ((v
!= NULL
) && (unsigned(idx
) > v
->max_array_access
))
1257 v
->max_array_access
= idx
;
1259 } else if (array
->type
->array_size() == 0) {
1260 _mesa_glsl_error(&loc
, state
, "unsized array index must be constant");
1264 result
->type
= glsl_type::error_type
;
1266 type
= result
->type
;
1270 case ast_function_call
:
1271 /* Should *NEVER* get here. ast_function_call should always be handled
1272 * by ast_function_expression::hir.
1277 case ast_identifier
: {
1278 /* ast_identifier can appear several places in a full abstract syntax
1279 * tree. This particular use must be at location specified in the grammar
1280 * as 'variable_identifier'.
1283 state
->symbols
->get_variable(this->primary_expression
.identifier
);
1285 result
= new(ctx
) ir_dereference_variable(var
);
1288 type
= result
->type
;
1290 _mesa_glsl_error(& loc
, state
, "`%s' undeclared",
1291 this->primary_expression
.identifier
);
1293 error_emitted
= true;
1298 case ast_int_constant
:
1299 type
= glsl_type::int_type
;
1300 result
= new(ctx
) ir_constant(this->primary_expression
.int_constant
);
1303 case ast_uint_constant
:
1304 type
= glsl_type::uint_type
;
1305 result
= new(ctx
) ir_constant(this->primary_expression
.uint_constant
);
1308 case ast_float_constant
:
1309 type
= glsl_type::float_type
;
1310 result
= new(ctx
) ir_constant(this->primary_expression
.float_constant
);
1313 case ast_bool_constant
:
1314 type
= glsl_type::bool_type
;
1315 result
= new(ctx
) ir_constant(bool(this->primary_expression
.bool_constant
));
1318 case ast_sequence
: {
1319 /* It should not be possible to generate a sequence in the AST without
1320 * any expressions in it.
1322 assert(!this->expressions
.is_empty());
1324 /* The r-value of a sequence is the last expression in the sequence. If
1325 * the other expressions in the sequence do not have side-effects (and
1326 * therefore add instructions to the instruction list), they get dropped
1329 foreach_list_typed (ast_node
, ast
, link
, &this->expressions
)
1330 result
= ast
->hir(instructions
, state
);
1332 type
= result
->type
;
1334 /* Any errors should have already been emitted in the loop above.
1336 error_emitted
= true;
1341 if (type
->is_error() && !error_emitted
)
1342 _mesa_glsl_error(& loc
, state
, "type mismatch");
1349 ast_expression_statement::hir(exec_list
*instructions
,
1350 struct _mesa_glsl_parse_state
*state
)
1352 /* It is possible to have expression statements that don't have an
1353 * expression. This is the solitary semicolon:
1355 * for (i = 0; i < 5; i++)
1358 * In this case the expression will be NULL. Test for NULL and don't do
1359 * anything in that case.
1361 if (expression
!= NULL
)
1362 expression
->hir(instructions
, state
);
1364 /* Statements do not have r-values.
1371 ast_compound_statement::hir(exec_list
*instructions
,
1372 struct _mesa_glsl_parse_state
*state
)
1375 state
->symbols
->push_scope();
1377 foreach_list_typed (ast_node
, ast
, link
, &this->statements
)
1378 ast
->hir(instructions
, state
);
1381 state
->symbols
->pop_scope();
1383 /* Compound statements do not have r-values.
1389 static const glsl_type
*
1390 process_array_type(const glsl_type
*base
, ast_node
*array_size
,
1391 struct _mesa_glsl_parse_state
*state
)
1393 unsigned length
= 0;
1395 /* FINISHME: Reject delcarations of multidimensional arrays. */
1397 if (array_size
!= NULL
) {
1398 exec_list dummy_instructions
;
1399 ir_rvalue
*const ir
= array_size
->hir(& dummy_instructions
, state
);
1400 YYLTYPE loc
= array_size
->get_location();
1402 /* FINISHME: Verify that the grammar forbids side-effects in array
1403 * FINISHME: sizes. i.e., 'vec4 [x = 12] data'
1405 assert(dummy_instructions
.is_empty());
1408 if (!ir
->type
->is_integer()) {
1409 _mesa_glsl_error(& loc
, state
, "array size must be integer type");
1410 } else if (!ir
->type
->is_scalar()) {
1411 _mesa_glsl_error(& loc
, state
, "array size must be scalar type");
1413 ir_constant
*const size
= ir
->constant_expression_value();
1416 _mesa_glsl_error(& loc
, state
, "array size must be a "
1417 "constant valued expression");
1418 } else if (size
->value
.i
[0] <= 0) {
1419 _mesa_glsl_error(& loc
, state
, "array size must be > 0");
1421 assert(size
->type
== ir
->type
);
1422 length
= size
->value
.u
[0];
1428 return glsl_type::get_array_instance(base
, length
);
1433 ast_type_specifier::glsl_type(const char **name
,
1434 struct _mesa_glsl_parse_state
*state
) const
1436 const struct glsl_type
*type
;
1438 if ((this->type_specifier
== ast_struct
) && (this->type_name
== NULL
)) {
1439 /* FINISHME: Handle annonymous structures. */
1442 type
= state
->symbols
->get_type(this->type_name
);
1443 *name
= this->type_name
;
1445 if (this->is_array
) {
1446 type
= process_array_type(type
, this->array_size
, state
);
1455 apply_type_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
1456 struct ir_variable
*var
,
1457 struct _mesa_glsl_parse_state
*state
,
1460 if (qual
->invariant
)
1463 /* FINISHME: Mark 'in' variables at global scope as read-only. */
1464 if (qual
->constant
|| qual
->attribute
|| qual
->uniform
1465 || (qual
->varying
&& (state
->target
== fragment_shader
)))
1471 if (qual
->attribute
&& state
->target
!= vertex_shader
) {
1472 var
->type
= glsl_type::error_type
;
1473 _mesa_glsl_error(loc
, state
,
1474 "`attribute' variables may not be declared in the "
1476 _mesa_glsl_shader_target_name(state
->target
));
1479 /* From page 25 (page 31 of the PDF) of the GLSL 1.10 spec:
1481 * "The varying qualifier can be used only with the data types
1482 * float, vec2, vec3, vec4, mat2, mat3, and mat4, or arrays of
1485 if (qual
->varying
) {
1486 const glsl_type
*non_array_type
;
1488 if (var
->type
&& var
->type
->is_array())
1489 non_array_type
= var
->type
->fields
.array
;
1491 non_array_type
= var
->type
;
1493 if (non_array_type
&& non_array_type
->base_type
!= GLSL_TYPE_FLOAT
) {
1494 var
->type
= glsl_type::error_type
;
1495 _mesa_glsl_error(loc
, state
,
1496 "varying variables must be of base type float");
1500 /* If there is no qualifier that changes the mode of the variable, leave
1501 * the setting alone.
1503 if (qual
->in
&& qual
->out
)
1504 var
->mode
= ir_var_inout
;
1505 else if (qual
->attribute
|| qual
->in
1506 || (qual
->varying
&& (state
->target
== fragment_shader
)))
1507 var
->mode
= ir_var_in
;
1508 else if (qual
->out
|| (qual
->varying
&& (state
->target
== vertex_shader
)))
1509 var
->mode
= ir_var_out
;
1510 else if (qual
->uniform
)
1511 var
->mode
= ir_var_uniform
;
1514 var
->shader_in
= true;
1516 /* Any 'in' or 'inout' variables at global scope must be marked as being
1517 * shader inputs. Likewise, any 'out' or 'inout' variables at global scope
1518 * must be marked as being shader outputs.
1520 if (state
->current_function
== NULL
) {
1521 switch (var
->mode
) {
1523 case ir_var_uniform
:
1524 var
->shader_in
= true;
1527 var
->shader_out
= true;
1530 var
->shader_in
= true;
1531 var
->shader_out
= true;
1539 var
->interpolation
= ir_var_flat
;
1540 else if (qual
->noperspective
)
1541 var
->interpolation
= ir_var_noperspective
;
1543 var
->interpolation
= ir_var_smooth
;
1545 if (var
->type
->is_array() && (state
->language_version
>= 120)) {
1546 var
->array_lvalue
= true;
1552 ast_declarator_list::hir(exec_list
*instructions
,
1553 struct _mesa_glsl_parse_state
*state
)
1556 const struct glsl_type
*decl_type
;
1557 const char *type_name
= NULL
;
1558 ir_rvalue
*result
= NULL
;
1559 YYLTYPE loc
= this->get_location();
1561 /* From page 46 (page 52 of the PDF) of the GLSL 1.50 spec:
1563 * "To ensure that a particular output variable is invariant, it is
1564 * necessary to use the invariant qualifier. It can either be used to
1565 * qualify a previously declared variable as being invariant
1567 * invariant gl_Position; // make existing gl_Position be invariant"
1569 * In these cases the parser will set the 'invariant' flag in the declarator
1570 * list, and the type will be NULL.
1572 if (this->invariant
) {
1573 assert(this->type
== NULL
);
1575 if (state
->current_function
!= NULL
) {
1576 _mesa_glsl_error(& loc
, state
,
1577 "All uses of `invariant' keyword must be at global "
1581 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
1582 assert(!decl
->is_array
);
1583 assert(decl
->array_size
== NULL
);
1584 assert(decl
->initializer
== NULL
);
1586 ir_variable
*const earlier
=
1587 state
->symbols
->get_variable(decl
->identifier
);
1588 if (earlier
== NULL
) {
1589 _mesa_glsl_error(& loc
, state
,
1590 "Undeclared variable `%s' cannot be marked "
1591 "invariant\n", decl
->identifier
);
1592 } else if ((state
->target
== vertex_shader
)
1593 && (earlier
->mode
!= ir_var_out
)) {
1594 _mesa_glsl_error(& loc
, state
,
1595 "`%s' cannot be marked invariant, vertex shader "
1596 "outputs only\n", decl
->identifier
);
1597 } else if ((state
->target
== fragment_shader
)
1598 && (earlier
->mode
!= ir_var_in
)) {
1599 _mesa_glsl_error(& loc
, state
,
1600 "`%s' cannot be marked invariant, fragment shader "
1601 "inputs only\n", decl
->identifier
);
1603 earlier
->invariant
= true;
1607 /* Invariant redeclarations do not have r-values.
1612 assert(this->type
!= NULL
);
1613 assert(!this->invariant
);
1615 /* The type specifier may contain a structure definition. Process that
1616 * before any of the variable declarations.
1618 (void) this->type
->specifier
->hir(instructions
, state
);
1620 decl_type
= this->type
->specifier
->glsl_type(& type_name
, state
);
1621 if (this->declarations
.is_empty()) {
1622 /* The only valid case where the declaration list can be empty is when
1623 * the declaration is setting the default precision of a built-in type
1624 * (e.g., 'precision highp vec4;').
1627 if (decl_type
!= NULL
) {
1629 _mesa_glsl_error(& loc
, state
, "incomplete declaration");
1633 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
1634 const struct glsl_type
*var_type
;
1635 struct ir_variable
*var
;
1637 /* FINISHME: Emit a warning if a variable declaration shadows a
1638 * FINISHME: declaration at a higher scope.
1641 if ((decl_type
== NULL
) || decl_type
->is_void()) {
1642 if (type_name
!= NULL
) {
1643 _mesa_glsl_error(& loc
, state
,
1644 "invalid type `%s' in declaration of `%s'",
1645 type_name
, decl
->identifier
);
1647 _mesa_glsl_error(& loc
, state
,
1648 "invalid type in declaration of `%s'",
1654 if (decl
->is_array
) {
1655 var_type
= process_array_type(decl_type
, decl
->array_size
, state
);
1657 var_type
= decl_type
;
1660 var
= new(ctx
) ir_variable(var_type
, decl
->identifier
, ir_var_auto
);
1662 /* From page 22 (page 28 of the PDF) of the GLSL 1.10 specification;
1664 * "Global variables can only use the qualifiers const,
1665 * attribute, uni form, or varying. Only one may be
1668 * Local variables can only use the qualifier const."
1670 * This is relaxed in GLSL 1.30.
1672 if (state
->language_version
< 120) {
1673 if (this->type
->qualifier
.out
) {
1674 _mesa_glsl_error(& loc
, state
,
1675 "`out' qualifier in declaration of `%s' "
1676 "only valid for function parameters in GLSL 1.10.",
1679 if (this->type
->qualifier
.in
) {
1680 _mesa_glsl_error(& loc
, state
,
1681 "`in' qualifier in declaration of `%s' "
1682 "only valid for function parameters in GLSL 1.10.",
1685 /* FINISHME: Test for other invalid qualifiers. */
1688 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
,
1691 if (this->type
->qualifier
.invariant
) {
1692 if ((state
->target
== vertex_shader
) && !var
->shader_out
) {
1693 _mesa_glsl_error(& loc
, state
,
1694 "`%s' cannot be marked invariant, vertex shader "
1695 "outputs only\n", var
->name
);
1696 } else if ((state
->target
== fragment_shader
) && !var
->shader_in
) {
1697 _mesa_glsl_error(& loc
, state
,
1698 "`%s' cannot be marked invariant, fragment shader "
1699 "inputs only\n", var
->name
);
1703 if (state
->current_function
!= NULL
) {
1704 const char *mode
= NULL
;
1705 const char *extra
= "";
1707 /* There is no need to check for 'inout' here because the parser will
1708 * only allow that in function parameter lists.
1710 if (this->type
->qualifier
.attribute
) {
1712 } else if (this->type
->qualifier
.uniform
) {
1714 } else if (this->type
->qualifier
.varying
) {
1716 } else if (this->type
->qualifier
.in
) {
1718 extra
= " or in function parameter list";
1719 } else if (this->type
->qualifier
.out
) {
1721 extra
= " or in function parameter list";
1725 _mesa_glsl_error(& loc
, state
,
1726 "%s variable `%s' must be declared at "
1728 mode
, var
->name
, extra
);
1730 } else if (var
->mode
== ir_var_in
) {
1731 if (state
->target
== vertex_shader
) {
1732 bool error_emitted
= false;
1734 /* From page 31 (page 37 of the PDF) of the GLSL 1.50 spec:
1736 * "Vertex shader inputs can only be float, floating-point
1737 * vectors, matrices, signed and unsigned integers and integer
1738 * vectors. Vertex shader inputs can also form arrays of these
1739 * types, but not structures."
1741 * From page 31 (page 27 of the PDF) of the GLSL 1.30 spec:
1743 * "Vertex shader inputs can only be float, floating-point
1744 * vectors, matrices, signed and unsigned integers and integer
1745 * vectors. They cannot be arrays or structures."
1747 * From page 23 (page 29 of the PDF) of the GLSL 1.20 spec:
1749 * "The attribute qualifier can be used only with float,
1750 * floating-point vectors, and matrices. Attribute variables
1751 * cannot be declared as arrays or structures."
1753 const glsl_type
*check_type
= var
->type
->is_array()
1754 ? var
->type
->fields
.array
: var
->type
;
1756 switch (check_type
->base_type
) {
1757 case GLSL_TYPE_FLOAT
:
1759 case GLSL_TYPE_UINT
:
1761 if (state
->language_version
> 120)
1765 _mesa_glsl_error(& loc
, state
,
1766 "vertex shader input / attribute cannot have "
1768 var
->type
->is_array() ? "array of " : "",
1770 error_emitted
= true;
1773 if (!error_emitted
&& (state
->language_version
<= 130)
1774 && var
->type
->is_array()) {
1775 _mesa_glsl_error(& loc
, state
,
1776 "vertex shader input / attribute cannot have "
1778 error_emitted
= true;
1783 /* Process the initializer and add its instructions to a temporary
1784 * list. This list will be added to the instruction stream (below) after
1785 * the declaration is added. This is done because in some cases (such as
1786 * redeclarations) the declaration may not actually be added to the
1787 * instruction stream.
1789 exec_list intializer_instructions
;
1790 if (decl
->initializer
!= NULL
) {
1791 YYLTYPE initializer_loc
= decl
->initializer
->get_location();
1793 /* From page 24 (page 30 of the PDF) of the GLSL 1.10 spec:
1795 * "All uniform variables are read-only and are initialized either
1796 * directly by an application via API commands, or indirectly by
1799 if ((state
->language_version
<= 110)
1800 && (var
->mode
== ir_var_uniform
)) {
1801 _mesa_glsl_error(& initializer_loc
, state
,
1802 "cannot initialize uniforms in GLSL 1.10");
1805 if (var
->type
->is_sampler()) {
1806 _mesa_glsl_error(& initializer_loc
, state
,
1807 "cannot initialize samplers");
1810 if ((var
->mode
== ir_var_in
) && (state
->current_function
== NULL
)) {
1811 _mesa_glsl_error(& initializer_loc
, state
,
1812 "cannot initialize %s shader input / %s",
1813 _mesa_glsl_shader_target_name(state
->target
),
1814 (state
->target
== vertex_shader
)
1815 ? "attribute" : "varying");
1818 ir_dereference
*const lhs
= new(ctx
) ir_dereference_variable(var
);
1819 ir_rvalue
*rhs
= decl
->initializer
->hir(&intializer_instructions
,
1822 /* Calculate the constant value if this is a const or uniform
1825 if (this->type
->qualifier
.constant
|| this->type
->qualifier
.uniform
) {
1826 ir_rvalue
*new_rhs
= validate_assignment(state
, var
->type
, rhs
);
1827 if (new_rhs
!= NULL
) {
1830 _mesa_glsl_error(&initializer_loc
, state
,
1831 "initializer of type %s cannot be assigned to "
1832 "variable of type %s",
1833 rhs
->type
->name
, var
->type
->name
);
1836 ir_constant
*constant_value
= rhs
->constant_expression_value();
1837 if (!constant_value
) {
1838 _mesa_glsl_error(& initializer_loc
, state
,
1839 "initializer of %s variable `%s' must be a "
1840 "constant expression",
1841 (this->type
->qualifier
.constant
)
1842 ? "const" : "uniform",
1845 rhs
= constant_value
;
1846 var
->constant_value
= constant_value
;
1850 if (rhs
&& !rhs
->type
->is_error()) {
1851 bool temp
= var
->read_only
;
1852 if (this->type
->qualifier
.constant
)
1853 var
->read_only
= false;
1855 /* Never emit code to initialize a uniform.
1857 if (!this->type
->qualifier
.uniform
)
1858 result
= do_assignment(&intializer_instructions
, state
, lhs
, rhs
,
1859 this->get_location());
1860 var
->read_only
= temp
;
1864 /* From page 23 (page 29 of the PDF) of the GLSL 1.10 spec:
1866 * "It is an error to write to a const variable outside of
1867 * its declaration, so they must be initialized when
1870 if (this->type
->qualifier
.constant
&& decl
->initializer
== NULL
) {
1871 _mesa_glsl_error(& loc
, state
,
1872 "const declaration of `%s' must be initialized");
1875 /* Attempt to add the variable to the symbol table. If this fails, it
1876 * means the variable has already been declared at this scope. Arrays
1877 * fudge this rule a little bit.
1879 * From page 24 (page 30 of the PDF) of the GLSL 1.50 spec,
1881 * "It is legal to declare an array without a size and then
1882 * later re-declare the same name as an array of the same
1883 * type and specify a size."
1885 if (state
->symbols
->name_declared_this_scope(decl
->identifier
)) {
1886 ir_variable
*const earlier
=
1887 state
->symbols
->get_variable(decl
->identifier
);
1889 if ((earlier
!= NULL
)
1890 && (earlier
->type
->array_size() == 0)
1891 && var
->type
->is_array()
1892 && (var
->type
->element_type() == earlier
->type
->element_type())) {
1893 /* FINISHME: This doesn't match the qualifiers on the two
1894 * FINISHME: declarations. It's not 100% clear whether this is
1895 * FINISHME: required or not.
1898 /* From page 54 (page 60 of the PDF) of the GLSL 1.20 spec:
1900 * "The size [of gl_TexCoord] can be at most
1901 * gl_MaxTextureCoords."
1903 const unsigned size
= unsigned(var
->type
->array_size());
1904 if ((strcmp("gl_TexCoord", var
->name
) == 0)
1905 && (size
> state
->Const
.MaxTextureCoords
)) {
1906 YYLTYPE loc
= this->get_location();
1908 _mesa_glsl_error(& loc
, state
, "`gl_TexCoord' array size cannot "
1909 "be larger than gl_MaxTextureCoords (%u)\n",
1910 state
->Const
.MaxTextureCoords
);
1911 } else if ((size
> 0) && (size
<= earlier
->max_array_access
)) {
1912 YYLTYPE loc
= this->get_location();
1914 _mesa_glsl_error(& loc
, state
, "array size must be > %u due to "
1916 earlier
->max_array_access
);
1919 earlier
->type
= var
->type
;
1923 YYLTYPE loc
= this->get_location();
1925 _mesa_glsl_error(& loc
, state
, "`%s' redeclared",
1932 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
1934 * "Identifiers starting with "gl_" are reserved for use by
1935 * OpenGL, and may not be declared in a shader as either a
1936 * variable or a function."
1938 if (strncmp(decl
->identifier
, "gl_", 3) == 0) {
1939 /* FINISHME: This should only trigger if we're not redefining
1940 * FINISHME: a builtin (to add a qualifier, for example).
1942 _mesa_glsl_error(& loc
, state
,
1943 "identifier `%s' uses reserved `gl_' prefix",
1947 instructions
->push_tail(var
);
1948 instructions
->append_list(&intializer_instructions
);
1950 /* Add the variable to the symbol table after processing the initializer.
1951 * This differs from most C-like languages, but it follows the GLSL
1952 * specification. From page 28 (page 34 of the PDF) of the GLSL 1.50
1955 * "Within a declaration, the scope of a name starts immediately
1956 * after the initializer if present or immediately after the name
1957 * being declared if not."
1959 const bool added_variable
=
1960 state
->symbols
->add_variable(var
->name
, var
);
1961 assert(added_variable
);
1965 /* Generally, variable declarations do not have r-values. However,
1966 * one is used for the declaration in
1968 * while (bool b = some_condition()) {
1972 * so we return the rvalue from the last seen declaration here.
1979 ast_parameter_declarator::hir(exec_list
*instructions
,
1980 struct _mesa_glsl_parse_state
*state
)
1983 const struct glsl_type
*type
;
1984 const char *name
= NULL
;
1985 YYLTYPE loc
= this->get_location();
1987 type
= this->type
->specifier
->glsl_type(& name
, state
);
1991 _mesa_glsl_error(& loc
, state
,
1992 "invalid type `%s' in declaration of `%s'",
1993 name
, this->identifier
);
1995 _mesa_glsl_error(& loc
, state
,
1996 "invalid type in declaration of `%s'",
2000 type
= glsl_type::error_type
;
2003 /* From page 62 (page 68 of the PDF) of the GLSL 1.50 spec:
2005 * "Functions that accept no input arguments need not use void in the
2006 * argument list because prototypes (or definitions) are required and
2007 * therefore there is no ambiguity when an empty argument list "( )" is
2008 * declared. The idiom "(void)" as a parameter list is provided for
2011 * Placing this check here prevents a void parameter being set up
2012 * for a function, which avoids tripping up checks for main taking
2013 * parameters and lookups of an unnamed symbol.
2015 if (type
->is_void()) {
2016 if (this->identifier
!= NULL
)
2017 _mesa_glsl_error(& loc
, state
,
2018 "named parameter cannot have type `void'");
2024 if (formal_parameter
&& (this->identifier
== NULL
)) {
2025 _mesa_glsl_error(& loc
, state
, "formal parameter lacks a name");
2030 ir_variable
*var
= new(ctx
) ir_variable(type
, this->identifier
, ir_var_in
);
2032 /* FINISHME: Handle array declarations. Note that this requires
2033 * FINISHME: complete handling of constant expressions.
2036 /* Apply any specified qualifiers to the parameter declaration. Note that
2037 * for function parameters the default mode is 'in'.
2039 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
, & loc
);
2041 instructions
->push_tail(var
);
2043 /* Parameter declarations do not have r-values.
2050 ast_parameter_declarator::parameters_to_hir(exec_list
*ast_parameters
,
2052 exec_list
*ir_parameters
,
2053 _mesa_glsl_parse_state
*state
)
2055 ast_parameter_declarator
*void_param
= NULL
;
2058 foreach_list_typed (ast_parameter_declarator
, param
, link
, ast_parameters
) {
2059 param
->formal_parameter
= formal
;
2060 param
->hir(ir_parameters
, state
);
2068 if ((void_param
!= NULL
) && (count
> 1)) {
2069 YYLTYPE loc
= void_param
->get_location();
2071 _mesa_glsl_error(& loc
, state
,
2072 "`void' parameter must be only parameter");
2078 ast_function::hir(exec_list
*instructions
,
2079 struct _mesa_glsl_parse_state
*state
)
2082 ir_function
*f
= NULL
;
2083 ir_function_signature
*sig
= NULL
;
2084 exec_list hir_parameters
;
2086 const char *const name
= identifier
;
2088 /* Convert the list of function parameters to HIR now so that they can be
2089 * used below to compare this function's signature with previously seen
2090 * signatures for functions with the same name.
2092 ast_parameter_declarator::parameters_to_hir(& this->parameters
,
2094 & hir_parameters
, state
);
2096 const char *return_type_name
;
2097 const glsl_type
*return_type
=
2098 this->return_type
->specifier
->glsl_type(& return_type_name
, state
);
2100 assert(return_type
!= NULL
);
2102 /* From page 56 (page 62 of the PDF) of the GLSL 1.30 spec:
2103 * "No qualifier is allowed on the return type of a function."
2105 if (this->return_type
->has_qualifiers()) {
2106 YYLTYPE loc
= this->get_location();
2107 _mesa_glsl_error(& loc
, state
,
2108 "function `%s' return type has qualifiers", name
);
2111 /* Verify that this function's signature either doesn't match a previously
2112 * seen signature for a function with the same name, or, if a match is found,
2113 * that the previously seen signature does not have an associated definition.
2115 f
= state
->symbols
->get_function(name
);
2117 ir_function_signature
*sig
= f
->exact_matching_signature(&hir_parameters
);
2119 const char *badvar
= sig
->qualifiers_match(&hir_parameters
);
2120 if (badvar
!= NULL
) {
2121 YYLTYPE loc
= this->get_location();
2123 _mesa_glsl_error(&loc
, state
, "function `%s' parameter `%s' "
2124 "qualifiers don't match prototype", name
, badvar
);
2127 if (sig
->return_type
!= return_type
) {
2128 YYLTYPE loc
= this->get_location();
2130 _mesa_glsl_error(&loc
, state
, "function `%s' return type doesn't "
2131 "match prototype", name
);
2134 if (is_definition
&& sig
->is_defined
) {
2135 YYLTYPE loc
= this->get_location();
2137 _mesa_glsl_error(& loc
, state
, "function `%s' redefined", name
);
2141 } else if (state
->symbols
->name_declared_this_scope(name
)) {
2142 /* This function name shadows a non-function use of the same name.
2144 YYLTYPE loc
= this->get_location();
2146 _mesa_glsl_error(& loc
, state
, "function name `%s' conflicts with "
2147 "non-function", name
);
2150 f
= new(ctx
) ir_function(name
);
2151 state
->symbols
->add_function(f
->name
, f
);
2153 /* Emit the new function header */
2154 instructions
->push_tail(f
);
2157 /* Verify the return type of main() */
2158 if (strcmp(name
, "main") == 0) {
2159 if (! return_type
->is_void()) {
2160 YYLTYPE loc
= this->get_location();
2162 _mesa_glsl_error(& loc
, state
, "main() must return void");
2165 if (!hir_parameters
.is_empty()) {
2166 YYLTYPE loc
= this->get_location();
2168 _mesa_glsl_error(& loc
, state
, "main() must not take any parameters");
2172 /* Finish storing the information about this new function in its signature.
2175 sig
= new(ctx
) ir_function_signature(return_type
);
2176 f
->add_signature(sig
);
2179 sig
->replace_parameters(&hir_parameters
);
2182 /* Function declarations (prototypes) do not have r-values.
2189 ast_function_definition::hir(exec_list
*instructions
,
2190 struct _mesa_glsl_parse_state
*state
)
2192 prototype
->is_definition
= true;
2193 prototype
->hir(instructions
, state
);
2195 ir_function_signature
*signature
= prototype
->signature
;
2197 assert(state
->current_function
== NULL
);
2198 state
->current_function
= signature
;
2199 state
->found_return
= false;
2201 /* Duplicate parameters declared in the prototype as concrete variables.
2202 * Add these to the symbol table.
2204 state
->symbols
->push_scope();
2205 foreach_iter(exec_list_iterator
, iter
, signature
->parameters
) {
2206 ir_variable
*const var
= ((ir_instruction
*) iter
.get())->as_variable();
2208 assert(var
!= NULL
);
2210 /* The only way a parameter would "exist" is if two parameters have
2213 if (state
->symbols
->name_declared_this_scope(var
->name
)) {
2214 YYLTYPE loc
= this->get_location();
2216 _mesa_glsl_error(& loc
, state
, "parameter `%s' redeclared", var
->name
);
2218 state
->symbols
->add_variable(var
->name
, var
);
2222 /* Convert the body of the function to HIR. */
2223 this->body
->hir(&signature
->body
, state
);
2224 signature
->is_defined
= true;
2226 state
->symbols
->pop_scope();
2228 assert(state
->current_function
== signature
);
2229 state
->current_function
= NULL
;
2231 if (!signature
->return_type
->is_void() && !state
->found_return
) {
2232 YYLTYPE loc
= this->get_location();
2233 _mesa_glsl_error(& loc
, state
, "function `%s' has non-void return type "
2234 "%s, but no return statement",
2235 signature
->function_name(),
2236 signature
->return_type
->name
);
2239 /* Function definitions do not have r-values.
2246 ast_jump_statement::hir(exec_list
*instructions
,
2247 struct _mesa_glsl_parse_state
*state
)
2254 assert(state
->current_function
);
2256 if (opt_return_value
) {
2257 if (state
->current_function
->return_type
->base_type
==
2259 YYLTYPE loc
= this->get_location();
2261 _mesa_glsl_error(& loc
, state
,
2262 "`return` with a value, in function `%s' "
2264 state
->current_function
->function_name());
2267 ir_expression
*const ret
= (ir_expression
*)
2268 opt_return_value
->hir(instructions
, state
);
2269 assert(ret
!= NULL
);
2271 /* Implicit conversions are not allowed for return values. */
2272 if (state
->current_function
->return_type
!= ret
->type
) {
2273 YYLTYPE loc
= this->get_location();
2275 _mesa_glsl_error(& loc
, state
,
2276 "`return' with wrong type %s, in function `%s' "
2279 state
->current_function
->function_name(),
2280 state
->current_function
->return_type
->name
);
2283 inst
= new(ctx
) ir_return(ret
);
2285 if (state
->current_function
->return_type
->base_type
!=
2287 YYLTYPE loc
= this->get_location();
2289 _mesa_glsl_error(& loc
, state
,
2290 "`return' with no value, in function %s returning "
2292 state
->current_function
->function_name());
2294 inst
= new(ctx
) ir_return
;
2297 state
->found_return
= true;
2298 instructions
->push_tail(inst
);
2303 if (state
->target
!= fragment_shader
) {
2304 YYLTYPE loc
= this->get_location();
2306 _mesa_glsl_error(& loc
, state
,
2307 "`discard' may only appear in a fragment shader");
2309 instructions
->push_tail(new(ctx
) ir_discard
);
2314 /* FINISHME: Handle switch-statements. They cannot contain 'continue',
2315 * FINISHME: and they use a different IR instruction for 'break'.
2317 /* FINISHME: Correctly handle the nesting. If a switch-statement is
2318 * FINISHME: inside a loop, a 'continue' is valid and will bind to the
2321 if (state
->loop_or_switch_nesting
== NULL
) {
2322 YYLTYPE loc
= this->get_location();
2324 _mesa_glsl_error(& loc
, state
,
2325 "`%s' may only appear in a loop",
2326 (mode
== ast_break
) ? "break" : "continue");
2328 ir_loop
*const loop
= state
->loop_or_switch_nesting
->as_loop();
2330 /* Inline the for loop expression again, since we don't know
2331 * where near the end of the loop body the normal copy of it
2332 * is going to be placed.
2334 if (mode
== ast_continue
&&
2335 state
->loop_or_switch_nesting_ast
->rest_expression
) {
2336 state
->loop_or_switch_nesting_ast
->rest_expression
->hir(instructions
,
2341 ir_loop_jump
*const jump
=
2342 new(ctx
) ir_loop_jump((mode
== ast_break
)
2343 ? ir_loop_jump::jump_break
2344 : ir_loop_jump::jump_continue
);
2345 instructions
->push_tail(jump
);
2352 /* Jump instructions do not have r-values.
2359 ast_selection_statement::hir(exec_list
*instructions
,
2360 struct _mesa_glsl_parse_state
*state
)
2364 ir_rvalue
*const condition
= this->condition
->hir(instructions
, state
);
2366 /* From page 66 (page 72 of the PDF) of the GLSL 1.50 spec:
2368 * "Any expression whose type evaluates to a Boolean can be used as the
2369 * conditional expression bool-expression. Vector types are not accepted
2370 * as the expression to if."
2372 * The checks are separated so that higher quality diagnostics can be
2373 * generated for cases where both rules are violated.
2375 if (!condition
->type
->is_boolean() || !condition
->type
->is_scalar()) {
2376 YYLTYPE loc
= this->condition
->get_location();
2378 _mesa_glsl_error(& loc
, state
, "if-statement condition must be scalar "
2382 ir_if
*const stmt
= new(ctx
) ir_if(condition
);
2384 if (then_statement
!= NULL
)
2385 then_statement
->hir(& stmt
->then_instructions
, state
);
2387 if (else_statement
!= NULL
)
2388 else_statement
->hir(& stmt
->else_instructions
, state
);
2390 instructions
->push_tail(stmt
);
2392 /* if-statements do not have r-values.
2399 ast_iteration_statement::condition_to_hir(ir_loop
*stmt
,
2400 struct _mesa_glsl_parse_state
*state
)
2404 if (condition
!= NULL
) {
2405 ir_rvalue
*const cond
=
2406 condition
->hir(& stmt
->body_instructions
, state
);
2409 || !cond
->type
->is_boolean() || !cond
->type
->is_scalar()) {
2410 YYLTYPE loc
= condition
->get_location();
2412 _mesa_glsl_error(& loc
, state
,
2413 "loop condition must be scalar boolean");
2415 /* As the first code in the loop body, generate a block that looks
2416 * like 'if (!condition) break;' as the loop termination condition.
2418 ir_rvalue
*const not_cond
=
2419 new(ctx
) ir_expression(ir_unop_logic_not
, glsl_type::bool_type
, cond
,
2422 ir_if
*const if_stmt
= new(ctx
) ir_if(not_cond
);
2424 ir_jump
*const break_stmt
=
2425 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
2427 if_stmt
->then_instructions
.push_tail(break_stmt
);
2428 stmt
->body_instructions
.push_tail(if_stmt
);
2435 ast_iteration_statement::hir(exec_list
*instructions
,
2436 struct _mesa_glsl_parse_state
*state
)
2440 /* For-loops and while-loops start a new scope, but do-while loops do not.
2442 if (mode
!= ast_do_while
)
2443 state
->symbols
->push_scope();
2445 if (init_statement
!= NULL
)
2446 init_statement
->hir(instructions
, state
);
2448 ir_loop
*const stmt
= new(ctx
) ir_loop();
2449 instructions
->push_tail(stmt
);
2451 /* Track the current loop and / or switch-statement nesting.
2453 ir_instruction
*const nesting
= state
->loop_or_switch_nesting
;
2454 ast_iteration_statement
*nesting_ast
= state
->loop_or_switch_nesting_ast
;
2456 state
->loop_or_switch_nesting
= stmt
;
2457 state
->loop_or_switch_nesting_ast
= this;
2459 if (mode
!= ast_do_while
)
2460 condition_to_hir(stmt
, state
);
2463 body
->hir(& stmt
->body_instructions
, state
);
2465 if (rest_expression
!= NULL
)
2466 rest_expression
->hir(& stmt
->body_instructions
, state
);
2468 if (mode
== ast_do_while
)
2469 condition_to_hir(stmt
, state
);
2471 if (mode
!= ast_do_while
)
2472 state
->symbols
->pop_scope();
2474 /* Restore previous nesting before returning.
2476 state
->loop_or_switch_nesting
= nesting
;
2477 state
->loop_or_switch_nesting_ast
= nesting_ast
;
2479 /* Loops do not have r-values.
2486 ast_type_specifier::hir(exec_list
*instructions
,
2487 struct _mesa_glsl_parse_state
*state
)
2489 if (this->structure
!= NULL
)
2490 return this->structure
->hir(instructions
, state
);
2497 ast_struct_specifier::hir(exec_list
*instructions
,
2498 struct _mesa_glsl_parse_state
*state
)
2500 unsigned decl_count
= 0;
2502 /* Make an initial pass over the list of structure fields to determine how
2503 * many there are. Each element in this list is an ast_declarator_list.
2504 * This means that we actually need to count the number of elements in the
2505 * 'declarations' list in each of the elements.
2507 foreach_list_typed (ast_declarator_list
, decl_list
, link
,
2508 &this->declarations
) {
2509 foreach_list_const (decl_ptr
, & decl_list
->declarations
) {
2515 /* Allocate storage for the structure fields and process the field
2516 * declarations. As the declarations are processed, try to also convert
2517 * the types to HIR. This ensures that structure definitions embedded in
2518 * other structure definitions are processed.
2520 glsl_struct_field
*const fields
= talloc_array(state
, glsl_struct_field
,
2524 foreach_list_typed (ast_declarator_list
, decl_list
, link
,
2525 &this->declarations
) {
2526 const char *type_name
;
2528 decl_list
->type
->specifier
->hir(instructions
, state
);
2530 const glsl_type
*decl_type
=
2531 decl_list
->type
->specifier
->glsl_type(& type_name
, state
);
2533 foreach_list_typed (ast_declaration
, decl
, link
,
2534 &decl_list
->declarations
) {
2535 const struct glsl_type
*const field_type
=
2537 ? process_array_type(decl_type
, decl
->array_size
, state
)
2540 fields
[i
].type
= (field_type
!= NULL
)
2541 ? field_type
: glsl_type::error_type
;
2542 fields
[i
].name
= decl
->identifier
;
2547 assert(i
== decl_count
);
2550 if (this->name
== NULL
) {
2551 static unsigned anon_count
= 1;
2554 snprintf(buf
, sizeof(buf
), "#anon_struct_%04x", anon_count
);
2562 const glsl_type
*t
=
2563 glsl_type::get_record_instance(fields
, decl_count
, name
);
2565 YYLTYPE loc
= this->get_location();
2566 if (!state
->symbols
->add_type(name
, t
)) {
2567 _mesa_glsl_error(& loc
, state
, "struct `%s' previously defined", name
);
2569 /* This logic is a bit tricky. It is an error to declare a structure at
2570 * global scope if there is also a function with the same name.
2572 if ((state
->current_function
== NULL
)
2573 && (state
->symbols
->get_function(name
) != NULL
)) {
2574 _mesa_glsl_error(& loc
, state
, "name `%s' previously defined", name
);
2576 t
->generate_constructor(state
->symbols
);
2579 const glsl_type
**s
= (const glsl_type
**)
2580 realloc(state
->user_structures
,
2581 sizeof(state
->user_structures
[0]) *
2582 (state
->num_user_structures
+ 1));
2584 s
[state
->num_user_structures
] = t
;
2585 state
->user_structures
= s
;
2586 state
->num_user_structures
++;
2590 /* Structure type definitions do not have r-values.