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
)
288 assert(type_b
->is_matrix());
290 /* A is a row vector and B is a matrix. Columns of A must match rows
291 * of B. Given the other previously tested constraints, this means
292 * the type of A must be the same as the vector type of a column from
295 if (type_a
== type_b
->column_type())
299 _mesa_glsl_error(loc
, state
, "size mismatch for matrix multiplication");
300 return glsl_type::error_type
;
304 /* "All other cases are illegal."
306 _mesa_glsl_error(loc
, state
, "type mismatch");
307 return glsl_type::error_type
;
311 static const struct glsl_type
*
312 unary_arithmetic_result_type(const struct glsl_type
*type
,
313 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
315 /* From GLSL 1.50 spec, page 57:
317 * "The arithmetic unary operators negate (-), post- and pre-increment
318 * and decrement (-- and ++) operate on integer or floating-point
319 * values (including vectors and matrices). All unary operators work
320 * component-wise on their operands. These result with the same type
323 if (!type
->is_numeric()) {
324 _mesa_glsl_error(loc
, state
,
325 "Operands to arithmetic operators must be numeric");
326 return glsl_type::error_type
;
333 static const struct glsl_type
*
334 modulus_result_type(const struct glsl_type
*type_a
,
335 const struct glsl_type
*type_b
,
336 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
338 /* From GLSL 1.50 spec, page 56:
339 * "The operator modulus (%) operates on signed or unsigned integers or
340 * integer vectors. The operand types must both be signed or both be
343 if (!type_a
->is_integer() || !type_b
->is_integer()
344 || (type_a
->base_type
!= type_b
->base_type
)) {
345 _mesa_glsl_error(loc
, state
, "type mismatch");
346 return glsl_type::error_type
;
349 /* "The operands cannot be vectors of differing size. If one operand is
350 * a scalar and the other vector, then the scalar is applied component-
351 * wise to the vector, resulting in the same type as the vector. If both
352 * are vectors of the same size, the result is computed component-wise."
354 if (type_a
->is_vector()) {
355 if (!type_b
->is_vector()
356 || (type_a
->vector_elements
== type_b
->vector_elements
))
361 /* "The operator modulus (%) is not defined for any other data types
362 * (non-integer types)."
364 _mesa_glsl_error(loc
, state
, "type mismatch");
365 return glsl_type::error_type
;
369 static const struct glsl_type
*
370 relational_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
371 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
373 const glsl_type
*type_a
= value_a
->type
;
374 const glsl_type
*type_b
= value_b
->type
;
376 /* From GLSL 1.50 spec, page 56:
377 * "The relational operators greater than (>), less than (<), greater
378 * than or equal (>=), and less than or equal (<=) operate only on
379 * scalar integer and scalar floating-point expressions."
381 if (!type_a
->is_numeric()
382 || !type_b
->is_numeric()
383 || !type_a
->is_scalar()
384 || !type_b
->is_scalar()) {
385 _mesa_glsl_error(loc
, state
,
386 "Operands to relational operators must be scalar and "
388 return glsl_type::error_type
;
391 /* "Either the operands' types must match, or the conversions from
392 * Section 4.1.10 "Implicit Conversions" will be applied to the integer
393 * operand, after which the types must match."
395 if (!apply_implicit_conversion(type_a
, value_b
, state
)
396 && !apply_implicit_conversion(type_b
, value_a
, state
)) {
397 _mesa_glsl_error(loc
, state
,
398 "Could not implicitly convert operands to "
399 "relational operator");
400 return glsl_type::error_type
;
402 type_a
= value_a
->type
;
403 type_b
= value_b
->type
;
405 if (type_a
->base_type
!= type_b
->base_type
) {
406 _mesa_glsl_error(loc
, state
, "base type mismatch");
407 return glsl_type::error_type
;
410 /* "The result is scalar Boolean."
412 return glsl_type::bool_type
;
417 * Validates that a value can be assigned to a location with a specified type
419 * Validates that \c rhs can be assigned to some location. If the types are
420 * not an exact match but an automatic conversion is possible, \c rhs will be
424 * \c NULL if \c rhs cannot be assigned to a location with type \c lhs_type.
425 * Otherwise the actual RHS to be assigned will be returned. This may be
426 * \c rhs, or it may be \c rhs after some type conversion.
429 * In addition to being used for assignments, this function is used to
430 * type-check return values.
433 validate_assignment(struct _mesa_glsl_parse_state
*state
,
434 const glsl_type
*lhs_type
, ir_rvalue
*rhs
)
436 const glsl_type
*rhs_type
= rhs
->type
;
438 /* If there is already some error in the RHS, just return it. Anything
439 * else will lead to an avalanche of error message back to the user.
441 if (rhs_type
->is_error())
444 /* If the types are identical, the assignment can trivially proceed.
446 if (rhs_type
== lhs_type
)
449 /* If the array element types are the same and the size of the LHS is zero,
450 * the assignment is okay.
452 * Note: Whole-array assignments are not permitted in GLSL 1.10, but this
453 * is handled by ir_dereference::is_lvalue.
455 if (lhs_type
->is_array() && rhs
->type
->is_array()
456 && (lhs_type
->element_type() == rhs
->type
->element_type())
457 && (lhs_type
->array_size() == 0)) {
461 /* Check for implicit conversion in GLSL 1.20 */
462 if (apply_implicit_conversion(lhs_type
, rhs
, state
)) {
463 rhs_type
= rhs
->type
;
464 if (rhs_type
== lhs_type
)
472 do_assignment(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
,
473 ir_rvalue
*lhs
, ir_rvalue
*rhs
,
477 bool error_emitted
= (lhs
->type
->is_error() || rhs
->type
->is_error());
479 if (!error_emitted
) {
480 /* FINISHME: This does not handle 'foo.bar.a.b.c[5].d = 5' */
481 if (!lhs
->is_lvalue()) {
482 _mesa_glsl_error(& lhs_loc
, state
, "non-lvalue in assignment");
483 error_emitted
= true;
487 ir_rvalue
*new_rhs
= validate_assignment(state
, lhs
->type
, rhs
);
488 if (new_rhs
== NULL
) {
489 _mesa_glsl_error(& lhs_loc
, state
, "type mismatch");
493 /* If the LHS array was not declared with a size, it takes it size from
494 * the RHS. If the LHS is an l-value and a whole array, it must be a
495 * dereference of a variable. Any other case would require that the LHS
496 * is either not an l-value or not a whole array.
498 if (lhs
->type
->array_size() == 0) {
499 ir_dereference
*const d
= lhs
->as_dereference();
503 ir_variable
*const var
= d
->variable_referenced();
507 if (var
->max_array_access
>= unsigned(rhs
->type
->array_size())) {
508 /* FINISHME: This should actually log the location of the RHS. */
509 _mesa_glsl_error(& lhs_loc
, state
, "array size must be > %u due to "
511 var
->max_array_access
);
514 var
->type
= glsl_type::get_array_instance(state
,
515 lhs
->type
->element_type(),
516 rhs
->type
->array_size());
520 /* Most callers of do_assignment (assign, add_assign, pre_inc/dec,
521 * but not post_inc) need the converted assigned value as an rvalue
522 * to handle things like:
526 * So we always just store the computed value being assigned to a
527 * temporary and return a deref of that temporary. If the rvalue
528 * ends up not being used, the temp will get copy-propagated out.
530 ir_variable
*var
= new(ctx
) ir_variable(rhs
->type
, "assignment_tmp");
531 ir_dereference_variable
*deref_var
= new(ctx
) ir_dereference_variable(var
);
532 instructions
->push_tail(var
);
533 instructions
->push_tail(new(ctx
) ir_assignment(deref_var
,
536 deref_var
= new(ctx
) ir_dereference_variable(var
);
538 instructions
->push_tail(new(ctx
) ir_assignment(lhs
,
542 return new(ctx
) ir_dereference_variable(var
);
547 * Generate a new temporary and add its declaration to the instruction stream
550 generate_temporary(const glsl_type
*type
, exec_list
*instructions
,
551 struct _mesa_glsl_parse_state
*state
)
554 char *name
= (char *) malloc(sizeof(char) * 13);
556 snprintf(name
, 13, "tmp_%08X", state
->temp_index
);
559 ir_variable
*const var
= new(ctx
) ir_variable(type
, name
);
560 instructions
->push_tail(var
);
567 get_lvalue_copy(exec_list
*instructions
, ir_rvalue
*lvalue
)
569 void *ctx
= talloc_parent(lvalue
);
572 /* FINISHME: Give unique names to the temporaries. */
573 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 error_emitted
= op
[0]->type
->is_error();
684 if (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_if
*const stmt
= new(ctx
) ir_if(op
[0]);
830 instructions
->push_tail(stmt
);
832 op
[1] = this->subexpressions
[1]->hir(&stmt
->then_instructions
, state
);
834 if (!op
[1]->type
->is_boolean() || !op
[1]->type
->is_scalar()) {
835 YYLTYPE loc
= this->subexpressions
[1]->get_location();
837 _mesa_glsl_error(& loc
, state
,
838 "RHS of `%s' must be scalar boolean",
839 operator_string(this->oper
));
840 error_emitted
= true;
843 ir_variable
*const tmp
= generate_temporary(glsl_type::bool_type
,
844 instructions
, state
);
846 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
847 ir_assignment
*const then_assign
=
848 new(ctx
) ir_assignment(then_deref
, op
[1], NULL
);
849 stmt
->then_instructions
.push_tail(then_assign
);
851 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
852 ir_assignment
*const else_assign
=
853 new(ctx
) ir_assignment(else_deref
, new(ctx
) ir_constant(false), NULL
);
854 stmt
->else_instructions
.push_tail(else_assign
);
856 result
= new(ctx
) ir_dereference_variable(tmp
);
863 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
865 if (!op
[0]->type
->is_boolean() || !op
[0]->type
->is_scalar()) {
866 YYLTYPE loc
= this->subexpressions
[0]->get_location();
868 _mesa_glsl_error(& loc
, state
, "LHS of `%s' must be scalar boolean",
869 operator_string(this->oper
));
870 error_emitted
= true;
873 ir_constant
*op0_const
= op
[0]->constant_expression_value();
875 if (op0_const
->value
.b
[0]) {
878 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
880 if (!op
[1]->type
->is_boolean() || !op
[1]->type
->is_scalar()) {
881 YYLTYPE loc
= this->subexpressions
[1]->get_location();
883 _mesa_glsl_error(& loc
, state
,
884 "RHS of `%s' must be scalar boolean",
885 operator_string(this->oper
));
886 error_emitted
= true;
890 type
= glsl_type::bool_type
;
892 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
893 instructions
->push_tail(stmt
);
895 ir_variable
*const tmp
= generate_temporary(glsl_type::bool_type
,
896 instructions
, state
);
898 op
[1] = this->subexpressions
[1]->hir(&stmt
->then_instructions
, state
);
900 if (!op
[1]->type
->is_boolean() || !op
[1]->type
->is_scalar()) {
901 YYLTYPE loc
= this->subexpressions
[1]->get_location();
903 _mesa_glsl_error(& loc
, state
, "RHS of `%s' must be scalar boolean",
904 operator_string(this->oper
));
905 error_emitted
= true;
908 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
909 ir_assignment
*const then_assign
=
910 new(ctx
) ir_assignment(then_deref
, new(ctx
) ir_constant(true), NULL
);
911 stmt
->then_instructions
.push_tail(then_assign
);
913 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
914 ir_assignment
*const else_assign
=
915 new(ctx
) ir_assignment(else_deref
, op
[1], NULL
);
916 stmt
->else_instructions
.push_tail(else_assign
);
918 result
= new(ctx
) ir_dereference_variable(tmp
);
925 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
926 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
929 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
931 type
= glsl_type::bool_type
;
935 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
937 if (!op
[0]->type
->is_boolean() || !op
[0]->type
->is_scalar()) {
938 YYLTYPE loc
= this->subexpressions
[0]->get_location();
940 _mesa_glsl_error(& loc
, state
,
941 "operand of `!' must be scalar boolean");
942 error_emitted
= true;
945 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
947 type
= glsl_type::bool_type
;
953 case ast_sub_assign
: {
954 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
955 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
957 type
= arithmetic_result_type(op
[0], op
[1],
958 (this->oper
== ast_mul_assign
),
961 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
964 result
= do_assignment(instructions
, state
,
965 op
[0]->clone(NULL
), temp_rhs
,
966 this->subexpressions
[0]->get_location());
968 error_emitted
= (op
[0]->type
->is_error());
970 /* GLSL 1.10 does not allow array assignment. However, we don't have to
971 * explicitly test for this because none of the binary expression
972 * operators allow array operands either.
978 case ast_mod_assign
: {
979 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
980 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
982 type
= modulus_result_type(op
[0]->type
, op
[1]->type
, state
, & loc
);
984 assert(operations
[this->oper
] == ir_binop_mod
);
986 struct ir_rvalue
*temp_rhs
;
987 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
990 result
= do_assignment(instructions
, state
,
991 op
[0]->clone(NULL
), temp_rhs
,
992 this->subexpressions
[0]->get_location());
994 error_emitted
= type
->is_error();
1000 _mesa_glsl_error(& loc
, state
,
1001 "FINISHME: implement bit-shift assignment operators");
1002 error_emitted
= true;
1005 case ast_and_assign
:
1006 case ast_xor_assign
:
1008 _mesa_glsl_error(& loc
, state
,
1009 "FINISHME: implement logic assignment operators");
1010 error_emitted
= true;
1013 case ast_conditional
: {
1014 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1016 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1018 * "The ternary selection operator (?:). It operates on three
1019 * expressions (exp1 ? exp2 : exp3). This operator evaluates the
1020 * first expression, which must result in a scalar Boolean."
1022 if (!op
[0]->type
->is_boolean() || !op
[0]->type
->is_scalar()) {
1023 YYLTYPE loc
= this->subexpressions
[0]->get_location();
1025 _mesa_glsl_error(& loc
, state
, "?: condition must be scalar boolean");
1026 error_emitted
= true;
1029 /* The :? operator is implemented by generating an anonymous temporary
1030 * followed by an if-statement. The last instruction in each branch of
1031 * the if-statement assigns a value to the anonymous temporary. This
1032 * temporary is the r-value of the expression.
1034 exec_list then_instructions
;
1035 exec_list else_instructions
;
1037 op
[1] = this->subexpressions
[1]->hir(&then_instructions
, state
);
1038 op
[2] = this->subexpressions
[2]->hir(&else_instructions
, state
);
1040 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1042 * "The second and third expressions can be any type, as
1043 * long their types match, or there is a conversion in
1044 * Section 4.1.10 "Implicit Conversions" that can be applied
1045 * to one of the expressions to make their types match. This
1046 * resulting matching type is the type of the entire
1049 if ((!apply_implicit_conversion(op
[1]->type
, op
[2], state
)
1050 && !apply_implicit_conversion(op
[2]->type
, op
[1], state
))
1051 || (op
[1]->type
!= op
[2]->type
)) {
1052 YYLTYPE loc
= this->subexpressions
[1]->get_location();
1054 _mesa_glsl_error(& loc
, state
, "Second and third operands of ?: "
1055 "operator must have matching types.");
1056 error_emitted
= true;
1057 type
= glsl_type::error_type
;
1062 ir_constant
*cond_val
= op
[0]->constant_expression_value();
1063 ir_constant
*then_val
= op
[1]->constant_expression_value();
1064 ir_constant
*else_val
= op
[2]->constant_expression_value();
1066 if (then_instructions
.is_empty()
1067 && else_instructions
.is_empty()
1068 && (cond_val
!= NULL
) && (then_val
!= NULL
) && (else_val
!= NULL
)) {
1069 result
= (cond_val
->value
.b
[0]) ? then_val
: else_val
;
1071 ir_variable
*const tmp
= generate_temporary(type
,
1072 instructions
, state
);
1074 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1075 instructions
->push_tail(stmt
);
1077 then_instructions
.move_nodes_to(& stmt
->then_instructions
);
1078 ir_dereference
*const then_deref
=
1079 new(ctx
) ir_dereference_variable(tmp
);
1080 ir_assignment
*const then_assign
=
1081 new(ctx
) ir_assignment(then_deref
, op
[1], NULL
);
1082 stmt
->then_instructions
.push_tail(then_assign
);
1084 else_instructions
.move_nodes_to(& stmt
->else_instructions
);
1085 ir_dereference
*const else_deref
=
1086 new(ctx
) ir_dereference_variable(tmp
);
1087 ir_assignment
*const else_assign
=
1088 new(ctx
) ir_assignment(else_deref
, op
[2], NULL
);
1089 stmt
->else_instructions
.push_tail(else_assign
);
1091 result
= new(ctx
) ir_dereference_variable(tmp
);
1098 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1099 if (op
[0]->type
->base_type
== GLSL_TYPE_FLOAT
)
1100 op
[1] = new(ctx
) ir_constant(1.0f
);
1102 op
[1] = new(ctx
) ir_constant(1);
1104 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1106 struct ir_rvalue
*temp_rhs
;
1107 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1110 result
= do_assignment(instructions
, state
,
1111 op
[0]->clone(NULL
), temp_rhs
,
1112 this->subexpressions
[0]->get_location());
1113 type
= result
->type
;
1114 error_emitted
= op
[0]->type
->is_error();
1119 case ast_post_dec
: {
1120 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1121 if (op
[0]->type
->base_type
== GLSL_TYPE_FLOAT
)
1122 op
[1] = new(ctx
) ir_constant(1.0f
);
1124 op
[1] = new(ctx
) ir_constant(1);
1126 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1128 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1130 struct ir_rvalue
*temp_rhs
;
1131 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1134 /* Get a temporary of a copy of the lvalue before it's modified.
1135 * This may get thrown away later.
1137 result
= get_lvalue_copy(instructions
, op
[0]->clone(NULL
));
1139 (void)do_assignment(instructions
, state
,
1140 op
[0]->clone(NULL
), temp_rhs
,
1141 this->subexpressions
[0]->get_location());
1143 type
= result
->type
;
1144 error_emitted
= op
[0]->type
->is_error();
1148 case ast_field_selection
:
1149 result
= _mesa_ast_field_selection_to_hir(this, instructions
, state
);
1150 type
= result
->type
;
1153 case ast_array_index
: {
1154 YYLTYPE index_loc
= subexpressions
[1]->get_location();
1156 op
[0] = subexpressions
[0]->hir(instructions
, state
);
1157 op
[1] = subexpressions
[1]->hir(instructions
, state
);
1159 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1161 ir_rvalue
*const array
= op
[0];
1163 result
= new(ctx
) ir_dereference_array(op
[0], op
[1]);
1165 /* Do not use op[0] after this point. Use array.
1173 if (!array
->type
->is_array()
1174 && !array
->type
->is_matrix()
1175 && !array
->type
->is_vector()) {
1176 _mesa_glsl_error(& index_loc
, state
,
1177 "cannot dereference non-array / non-matrix / "
1179 error_emitted
= true;
1182 if (!op
[1]->type
->is_integer()) {
1183 _mesa_glsl_error(& index_loc
, state
,
1184 "array index must be integer type");
1185 error_emitted
= true;
1186 } else if (!op
[1]->type
->is_scalar()) {
1187 _mesa_glsl_error(& index_loc
, state
,
1188 "array index must be scalar");
1189 error_emitted
= true;
1192 /* If the array index is a constant expression and the array has a
1193 * declared size, ensure that the access is in-bounds. If the array
1194 * index is not a constant expression, ensure that the array has a
1197 ir_constant
*const const_index
= op
[1]->constant_expression_value();
1198 if (const_index
!= NULL
) {
1199 const int idx
= const_index
->value
.i
[0];
1200 const char *type_name
;
1203 if (array
->type
->is_matrix()) {
1204 type_name
= "matrix";
1205 } else if (array
->type
->is_vector()) {
1206 type_name
= "vector";
1208 type_name
= "array";
1211 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec:
1213 * "It is illegal to declare an array with a size, and then
1214 * later (in the same shader) index the same array with an
1215 * integral constant expression greater than or equal to the
1216 * declared size. It is also illegal to index an array with a
1217 * negative constant expression."
1219 if (array
->type
->is_matrix()) {
1220 if (array
->type
->row_type()->vector_elements
<= idx
) {
1221 bound
= array
->type
->row_type()->vector_elements
;
1223 } else if (array
->type
->is_vector()) {
1224 if (array
->type
->vector_elements
<= idx
) {
1225 bound
= array
->type
->vector_elements
;
1228 if ((array
->type
->array_size() > 0)
1229 && (array
->type
->array_size() <= idx
)) {
1230 bound
= array
->type
->array_size();
1235 _mesa_glsl_error(& loc
, state
, "%s index must be < %u",
1237 error_emitted
= true;
1238 } else if (idx
< 0) {
1239 _mesa_glsl_error(& loc
, state
, "%s index must be >= 0",
1241 error_emitted
= true;
1244 if (array
->type
->is_array()) {
1245 /* If the array is a variable dereference, it dereferences the
1246 * whole array, by definition. Use this to get the variable.
1248 * FINISHME: Should some methods for getting / setting / testing
1249 * FINISHME: array access limits be added to ir_dereference?
1251 ir_variable
*const v
= array
->whole_variable_referenced();
1252 if ((v
!= NULL
) && (unsigned(idx
) > v
->max_array_access
))
1253 v
->max_array_access
= idx
;
1258 result
->type
= glsl_type::error_type
;
1260 type
= result
->type
;
1264 case ast_function_call
:
1265 /* Should *NEVER* get here. ast_function_call should always be handled
1266 * by ast_function_expression::hir.
1271 case ast_identifier
: {
1272 /* ast_identifier can appear several places in a full abstract syntax
1273 * tree. This particular use must be at location specified in the grammar
1274 * as 'variable_identifier'.
1277 state
->symbols
->get_variable(this->primary_expression
.identifier
);
1279 result
= new(ctx
) ir_dereference_variable(var
);
1282 type
= result
->type
;
1284 _mesa_glsl_error(& loc
, state
, "`%s' undeclared",
1285 this->primary_expression
.identifier
);
1287 error_emitted
= true;
1292 case ast_int_constant
:
1293 type
= glsl_type::int_type
;
1294 result
= new(ctx
) ir_constant(this->primary_expression
.int_constant
);
1297 case ast_uint_constant
:
1298 type
= glsl_type::uint_type
;
1299 result
= new(ctx
) ir_constant(this->primary_expression
.uint_constant
);
1302 case ast_float_constant
:
1303 type
= glsl_type::float_type
;
1304 result
= new(ctx
) ir_constant(this->primary_expression
.float_constant
);
1307 case ast_bool_constant
:
1308 type
= glsl_type::bool_type
;
1309 result
= new(ctx
) ir_constant(bool(this->primary_expression
.bool_constant
));
1312 case ast_sequence
: {
1313 /* It should not be possible to generate a sequence in the AST without
1314 * any expressions in it.
1316 assert(!this->expressions
.is_empty());
1318 /* The r-value of a sequence is the last expression in the sequence. If
1319 * the other expressions in the sequence do not have side-effects (and
1320 * therefore add instructions to the instruction list), they get dropped
1323 foreach_list_typed (ast_node
, ast
, link
, &this->expressions
)
1324 result
= ast
->hir(instructions
, state
);
1326 type
= result
->type
;
1328 /* Any errors should have already been emitted in the loop above.
1330 error_emitted
= true;
1335 if (type
->is_error() && !error_emitted
)
1336 _mesa_glsl_error(& loc
, state
, "type mismatch");
1343 ast_expression_statement::hir(exec_list
*instructions
,
1344 struct _mesa_glsl_parse_state
*state
)
1346 /* It is possible to have expression statements that don't have an
1347 * expression. This is the solitary semicolon:
1349 * for (i = 0; i < 5; i++)
1352 * In this case the expression will be NULL. Test for NULL and don't do
1353 * anything in that case.
1355 if (expression
!= NULL
)
1356 expression
->hir(instructions
, state
);
1358 /* Statements do not have r-values.
1365 ast_compound_statement::hir(exec_list
*instructions
,
1366 struct _mesa_glsl_parse_state
*state
)
1369 state
->symbols
->push_scope();
1371 foreach_list_typed (ast_node
, ast
, link
, &this->statements
)
1372 ast
->hir(instructions
, state
);
1375 state
->symbols
->pop_scope();
1377 /* Compound statements do not have r-values.
1383 static const glsl_type
*
1384 process_array_type(const glsl_type
*base
, ast_node
*array_size
,
1385 struct _mesa_glsl_parse_state
*state
)
1387 unsigned length
= 0;
1389 /* FINISHME: Reject delcarations of multidimensional arrays. */
1391 if (array_size
!= NULL
) {
1392 exec_list dummy_instructions
;
1393 ir_rvalue
*const ir
= array_size
->hir(& dummy_instructions
, state
);
1394 YYLTYPE loc
= array_size
->get_location();
1396 /* FINISHME: Verify that the grammar forbids side-effects in array
1397 * FINISHME: sizes. i.e., 'vec4 [x = 12] data'
1399 assert(dummy_instructions
.is_empty());
1402 if (!ir
->type
->is_integer()) {
1403 _mesa_glsl_error(& loc
, state
, "array size must be integer type");
1404 } else if (!ir
->type
->is_scalar()) {
1405 _mesa_glsl_error(& loc
, state
, "array size must be scalar type");
1407 ir_constant
*const size
= ir
->constant_expression_value();
1410 _mesa_glsl_error(& loc
, state
, "array size must be a "
1411 "constant valued expression");
1412 } else if (size
->value
.i
[0] <= 0) {
1413 _mesa_glsl_error(& loc
, state
, "array size must be > 0");
1415 assert(size
->type
== ir
->type
);
1416 length
= size
->value
.u
[0];
1422 return glsl_type::get_array_instance(state
, base
, length
);
1427 ast_type_specifier::glsl_type(const char **name
,
1428 struct _mesa_glsl_parse_state
*state
) const
1430 const struct glsl_type
*type
;
1432 if ((this->type_specifier
== ast_struct
) && (this->type_name
== NULL
)) {
1433 /* FINISHME: Handle annonymous structures. */
1436 type
= state
->symbols
->get_type(this->type_name
);
1437 *name
= this->type_name
;
1439 if (this->is_array
) {
1440 type
= process_array_type(type
, this->array_size
, state
);
1449 apply_type_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
1450 struct ir_variable
*var
,
1451 struct _mesa_glsl_parse_state
*state
,
1454 if (qual
->invariant
)
1457 /* FINISHME: Mark 'in' variables at global scope as read-only. */
1458 if (qual
->constant
|| qual
->attribute
|| qual
->uniform
1459 || (qual
->varying
&& (state
->target
== fragment_shader
)))
1465 if (qual
->attribute
&& state
->target
!= vertex_shader
) {
1466 var
->type
= glsl_type::error_type
;
1467 _mesa_glsl_error(loc
, state
,
1468 "`attribute' variables may not be declared in the "
1470 _mesa_glsl_shader_target_name(state
->target
));
1473 /* From page 25 (page 31 of the PDF) of the GLSL 1.10 spec:
1475 * "The varying qualifier can be used only with the data types
1476 * float, vec2, vec3, vec4, mat2, mat3, and mat4, or arrays of
1479 if (qual
->varying
) {
1480 const glsl_type
*non_array_type
;
1482 if (var
->type
&& var
->type
->is_array())
1483 non_array_type
= var
->type
->fields
.array
;
1485 non_array_type
= var
->type
;
1487 if (non_array_type
&& non_array_type
->base_type
!= GLSL_TYPE_FLOAT
) {
1488 var
->type
= glsl_type::error_type
;
1489 _mesa_glsl_error(loc
, state
,
1490 "varying variables must be of base type float");
1494 if (qual
->in
&& qual
->out
)
1495 var
->mode
= ir_var_inout
;
1496 else if (qual
->attribute
|| qual
->in
1497 || (qual
->varying
&& (state
->target
== fragment_shader
)))
1498 var
->mode
= ir_var_in
;
1499 else if (qual
->out
|| (qual
->varying
&& (state
->target
== vertex_shader
)))
1500 var
->mode
= ir_var_out
;
1501 else if (qual
->uniform
)
1502 var
->mode
= ir_var_uniform
;
1504 var
->mode
= ir_var_auto
;
1507 var
->shader_in
= true;
1509 /* Any 'in' or 'inout' variables at global scope must be marked as being
1510 * shader inputs. Likewise, any 'out' or 'inout' variables at global scope
1511 * must be marked as being shader outputs.
1513 if (state
->current_function
== NULL
) {
1514 switch (var
->mode
) {
1516 case ir_var_uniform
:
1517 var
->shader_in
= true;
1520 var
->shader_out
= true;
1523 var
->shader_in
= true;
1524 var
->shader_out
= true;
1532 var
->interpolation
= ir_var_flat
;
1533 else if (qual
->noperspective
)
1534 var
->interpolation
= ir_var_noperspective
;
1536 var
->interpolation
= ir_var_smooth
;
1538 if (var
->type
->is_array() && (state
->language_version
>= 120)) {
1539 var
->array_lvalue
= true;
1545 ast_declarator_list::hir(exec_list
*instructions
,
1546 struct _mesa_glsl_parse_state
*state
)
1549 const struct glsl_type
*decl_type
;
1550 const char *type_name
= NULL
;
1551 ir_rvalue
*result
= NULL
;
1552 YYLTYPE loc
= this->get_location();
1554 /* From page 46 (page 52 of the PDF) of the GLSL 1.50 spec:
1556 * "To ensure that a particular output variable is invariant, it is
1557 * necessary to use the invariant qualifier. It can either be used to
1558 * qualify a previously declared variable as being invariant
1560 * invariant gl_Position; // make existing gl_Position be invariant"
1562 * In these cases the parser will set the 'invariant' flag in the declarator
1563 * list, and the type will be NULL.
1565 if (this->invariant
) {
1566 assert(this->type
== NULL
);
1568 if (state
->current_function
!= NULL
) {
1569 _mesa_glsl_error(& loc
, state
,
1570 "All uses of `invariant' keyword must be at global "
1574 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
1575 assert(!decl
->is_array
);
1576 assert(decl
->array_size
== NULL
);
1577 assert(decl
->initializer
== NULL
);
1579 ir_variable
*const earlier
=
1580 state
->symbols
->get_variable(decl
->identifier
);
1581 if (earlier
== NULL
) {
1582 _mesa_glsl_error(& loc
, state
,
1583 "Undeclared variable `%s' cannot be marked "
1584 "invariant\n", decl
->identifier
);
1585 } else if ((state
->target
== vertex_shader
)
1586 && (earlier
->mode
!= ir_var_out
)) {
1587 _mesa_glsl_error(& loc
, state
,
1588 "`%s' cannot be marked invariant, vertex shader "
1589 "outputs only\n", decl
->identifier
);
1590 } else if ((state
->target
== fragment_shader
)
1591 && (earlier
->mode
!= ir_var_in
)) {
1592 _mesa_glsl_error(& loc
, state
,
1593 "`%s' cannot be marked invariant, fragment shader "
1594 "inputs only\n", decl
->identifier
);
1596 earlier
->invariant
= true;
1600 /* Invariant redeclarations do not have r-values.
1605 assert(this->type
!= NULL
);
1606 assert(!this->invariant
);
1608 /* The type specifier may contain a structure definition. Process that
1609 * before any of the variable declarations.
1611 (void) this->type
->specifier
->hir(instructions
, state
);
1613 decl_type
= this->type
->specifier
->glsl_type(& type_name
, state
);
1614 if (this->declarations
.is_empty()) {
1615 /* The only valid case where the declaration list can be empty is when
1616 * the declaration is setting the default precision of a built-in type
1617 * (e.g., 'precision highp vec4;').
1620 if (decl_type
!= NULL
) {
1622 _mesa_glsl_error(& loc
, state
, "incomplete declaration");
1626 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
1627 const struct glsl_type
*var_type
;
1628 struct ir_variable
*var
;
1630 /* FINISHME: Emit a warning if a variable declaration shadows a
1631 * FINISHME: declaration at a higher scope.
1634 if ((decl_type
== NULL
) || decl_type
->is_void()) {
1635 if (type_name
!= NULL
) {
1636 _mesa_glsl_error(& loc
, state
,
1637 "invalid type `%s' in declaration of `%s'",
1638 type_name
, decl
->identifier
);
1640 _mesa_glsl_error(& loc
, state
,
1641 "invalid type in declaration of `%s'",
1647 if (decl
->is_array
) {
1648 var_type
= process_array_type(decl_type
, decl
->array_size
, state
);
1650 var_type
= decl_type
;
1653 var
= new(ctx
) ir_variable(var_type
, decl
->identifier
);
1655 /* From page 22 (page 28 of the PDF) of the GLSL 1.10 specification;
1657 * "Global variables can only use the qualifiers const,
1658 * attribute, uni form, or varying. Only one may be
1661 * Local variables can only use the qualifier const."
1663 * This is relaxed in GLSL 1.30.
1665 if (state
->language_version
< 120) {
1666 if (this->type
->qualifier
.out
) {
1667 _mesa_glsl_error(& loc
, state
,
1668 "`out' qualifier in declaration of `%s' "
1669 "only valid for function parameters in GLSL 1.10.",
1672 if (this->type
->qualifier
.in
) {
1673 _mesa_glsl_error(& loc
, state
,
1674 "`in' qualifier in declaration of `%s' "
1675 "only valid for function parameters in GLSL 1.10.",
1678 /* FINISHME: Test for other invalid qualifiers. */
1681 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
,
1684 if (this->type
->qualifier
.invariant
) {
1685 if ((state
->target
== vertex_shader
) && !var
->shader_out
) {
1686 _mesa_glsl_error(& loc
, state
,
1687 "`%s' cannot be marked invariant, vertex shader "
1688 "outputs only\n", var
->name
);
1689 } else if ((state
->target
== fragment_shader
) && !var
->shader_in
) {
1690 _mesa_glsl_error(& loc
, state
,
1691 "`%s' cannot be marked invariant, fragment shader "
1692 "inputs only\n", var
->name
);
1696 if (state
->current_function
!= NULL
) {
1697 const char *mode
= NULL
;
1698 const char *extra
= "";
1700 /* There is no need to check for 'inout' here because the parser will
1701 * only allow that in function parameter lists.
1703 if (this->type
->qualifier
.attribute
) {
1705 } else if (this->type
->qualifier
.uniform
) {
1707 } else if (this->type
->qualifier
.varying
) {
1709 } else if (this->type
->qualifier
.in
) {
1711 extra
= " or in function parameter list";
1712 } else if (this->type
->qualifier
.out
) {
1714 extra
= " or in function parameter list";
1718 _mesa_glsl_error(& loc
, state
,
1719 "%s variable `%s' must be declared at "
1721 mode
, var
->name
, extra
);
1723 } else if (var
->mode
== ir_var_in
) {
1724 if (state
->target
== vertex_shader
) {
1725 bool error_emitted
= false;
1727 /* From page 31 (page 37 of the PDF) of the GLSL 1.50 spec:
1729 * "Vertex shader inputs can only be float, floating-point
1730 * vectors, matrices, signed and unsigned integers and integer
1731 * vectors. Vertex shader inputs can also form arrays of these
1732 * types, but not structures."
1734 * From page 31 (page 27 of the PDF) of the GLSL 1.30 spec:
1736 * "Vertex shader inputs can only be float, floating-point
1737 * vectors, matrices, signed and unsigned integers and integer
1738 * vectors. They cannot be arrays or structures."
1740 * From page 23 (page 29 of the PDF) of the GLSL 1.20 spec:
1742 * "The attribute qualifier can be used only with float,
1743 * floating-point vectors, and matrices. Attribute variables
1744 * cannot be declared as arrays or structures."
1746 const glsl_type
*check_type
= var
->type
->is_array()
1747 ? var
->type
->fields
.array
: var
->type
;
1749 switch (check_type
->base_type
) {
1750 case GLSL_TYPE_FLOAT
:
1752 case GLSL_TYPE_UINT
:
1754 if (state
->language_version
> 120)
1758 _mesa_glsl_error(& loc
, state
,
1759 "vertex shader input / attribute cannot have "
1761 var
->type
->is_array() ? "array of " : "",
1763 error_emitted
= true;
1766 if (!error_emitted
&& (state
->language_version
<= 130)
1767 && var
->type
->is_array()) {
1768 _mesa_glsl_error(& loc
, state
,
1769 "vertex shader input / attribute cannot have "
1771 error_emitted
= true;
1776 /* Process the initializer and add its instructions to a temporary
1777 * list. This list will be added to the instruction stream (below) after
1778 * the declaration is added. This is done because in some cases (such as
1779 * redeclarations) the declaration may not actually be added to the
1780 * instruction stream.
1782 exec_list intializer_instructions
;
1783 if (decl
->initializer
!= NULL
) {
1784 YYLTYPE initializer_loc
= decl
->initializer
->get_location();
1786 /* From page 24 (page 30 of the PDF) of the GLSL 1.10 spec:
1788 * "All uniform variables are read-only and are initialized either
1789 * directly by an application via API commands, or indirectly by
1792 if ((state
->language_version
<= 110)
1793 && (var
->mode
== ir_var_uniform
)) {
1794 _mesa_glsl_error(& initializer_loc
, state
,
1795 "cannot initialize uniforms in GLSL 1.10");
1798 if (var
->type
->is_sampler()) {
1799 _mesa_glsl_error(& initializer_loc
, state
,
1800 "cannot initialize samplers");
1803 if ((var
->mode
== ir_var_in
) && (state
->current_function
== NULL
)) {
1804 _mesa_glsl_error(& initializer_loc
, state
,
1805 "cannot initialize %s shader input / %s",
1806 _mesa_glsl_shader_target_name(state
->target
),
1807 (state
->target
== vertex_shader
)
1808 ? "attribute" : "varying");
1811 ir_dereference
*const lhs
= new(ctx
) ir_dereference_variable(var
);
1812 ir_rvalue
*rhs
= decl
->initializer
->hir(&intializer_instructions
,
1815 /* Calculate the constant value if this is a const or uniform
1818 if (this->type
->qualifier
.constant
|| this->type
->qualifier
.uniform
) {
1819 ir_constant
*constant_value
= rhs
->constant_expression_value();
1820 if (!constant_value
) {
1821 _mesa_glsl_error(& initializer_loc
, state
,
1822 "initializer of %s variable `%s' must be a "
1823 "constant expression",
1824 (this->type
->qualifier
.constant
)
1825 ? "const" : "uniform",
1828 rhs
= constant_value
;
1829 var
->constant_value
= constant_value
;
1833 if (rhs
&& !rhs
->type
->is_error()) {
1834 bool temp
= var
->read_only
;
1835 if (this->type
->qualifier
.constant
)
1836 var
->read_only
= false;
1838 /* Never emit code to initialize a uniform.
1840 if (!this->type
->qualifier
.uniform
)
1841 result
= do_assignment(&intializer_instructions
, state
, lhs
, rhs
,
1842 this->get_location());
1843 var
->read_only
= temp
;
1847 /* From page 23 (page 29 of the PDF) of the GLSL 1.10 spec:
1849 * "It is an error to write to a const variable outside of
1850 * its declaration, so they must be initialized when
1853 if (this->type
->qualifier
.constant
&& decl
->initializer
== NULL
) {
1854 _mesa_glsl_error(& loc
, state
,
1855 "const declaration of `%s' must be initialized");
1858 /* Attempt to add the variable to the symbol table. If this fails, it
1859 * means the variable has already been declared at this scope. Arrays
1860 * fudge this rule a little bit.
1862 * From page 24 (page 30 of the PDF) of the GLSL 1.50 spec,
1864 * "It is legal to declare an array without a size and then
1865 * later re-declare the same name as an array of the same
1866 * type and specify a size."
1868 if (state
->symbols
->name_declared_this_scope(decl
->identifier
)) {
1869 ir_variable
*const earlier
=
1870 state
->symbols
->get_variable(decl
->identifier
);
1872 if ((earlier
!= NULL
)
1873 && (earlier
->type
->array_size() == 0)
1874 && var
->type
->is_array()
1875 && (var
->type
->element_type() == earlier
->type
->element_type())) {
1876 /* FINISHME: This doesn't match the qualifiers on the two
1877 * FINISHME: declarations. It's not 100% clear whether this is
1878 * FINISHME: required or not.
1881 /* From page 54 (page 60 of the PDF) of the GLSL 1.20 spec:
1883 * "The size [of gl_TexCoord] can be at most
1884 * gl_MaxTextureCoords."
1886 const unsigned size
= unsigned(var
->type
->array_size());
1887 if ((strcmp("gl_TexCoord", var
->name
) == 0)
1888 && (size
> state
->Const
.MaxTextureCoords
)) {
1889 YYLTYPE loc
= this->get_location();
1891 _mesa_glsl_error(& loc
, state
, "`gl_TexCoord' array size cannot "
1892 "be larger than gl_MaxTextureCoords (%u)\n",
1893 state
->Const
.MaxTextureCoords
);
1894 } else if ((size
> 0) && (size
<= earlier
->max_array_access
)) {
1895 YYLTYPE loc
= this->get_location();
1897 _mesa_glsl_error(& loc
, state
, "array size must be > %u due to "
1899 earlier
->max_array_access
);
1902 earlier
->type
= var
->type
;
1906 YYLTYPE loc
= this->get_location();
1908 _mesa_glsl_error(& loc
, state
, "`%s' redeclared",
1915 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
1917 * "Identifiers starting with "gl_" are reserved for use by
1918 * OpenGL, and may not be declared in a shader as either a
1919 * variable or a function."
1921 if (strncmp(decl
->identifier
, "gl_", 3) == 0) {
1922 /* FINISHME: This should only trigger if we're not redefining
1923 * FINISHME: a builtin (to add a qualifier, for example).
1925 _mesa_glsl_error(& loc
, state
,
1926 "identifier `%s' uses reserved `gl_' prefix",
1930 instructions
->push_tail(var
);
1931 instructions
->append_list(&intializer_instructions
);
1933 /* Add the variable to the symbol table after processing the initializer.
1934 * This differs from most C-like languages, but it follows the GLSL
1935 * specification. From page 28 (page 34 of the PDF) of the GLSL 1.50
1938 * "Within a declaration, the scope of a name starts immediately
1939 * after the initializer if present or immediately after the name
1940 * being declared if not."
1942 const bool added_variable
=
1943 state
->symbols
->add_variable(var
->name
, var
);
1944 assert(added_variable
);
1948 /* Generally, variable declarations do not have r-values. However,
1949 * one is used for the declaration in
1951 * while (bool b = some_condition()) {
1955 * so we return the rvalue from the last seen declaration here.
1962 ast_parameter_declarator::hir(exec_list
*instructions
,
1963 struct _mesa_glsl_parse_state
*state
)
1966 const struct glsl_type
*type
;
1967 const char *name
= NULL
;
1968 YYLTYPE loc
= this->get_location();
1970 type
= this->type
->specifier
->glsl_type(& name
, state
);
1974 _mesa_glsl_error(& loc
, state
,
1975 "invalid type `%s' in declaration of `%s'",
1976 name
, this->identifier
);
1978 _mesa_glsl_error(& loc
, state
,
1979 "invalid type in declaration of `%s'",
1983 type
= glsl_type::error_type
;
1986 /* From page 62 (page 68 of the PDF) of the GLSL 1.50 spec:
1988 * "Functions that accept no input arguments need not use void in the
1989 * argument list because prototypes (or definitions) are required and
1990 * therefore there is no ambiguity when an empty argument list "( )" is
1991 * declared. The idiom "(void)" as a parameter list is provided for
1994 * Placing this check here prevents a void parameter being set up
1995 * for a function, which avoids tripping up checks for main taking
1996 * parameters and lookups of an unnamed symbol.
1998 if (type
->is_void()) {
1999 if (this->identifier
!= NULL
)
2000 _mesa_glsl_error(& loc
, state
,
2001 "named parameter cannot have type `void'");
2007 if (formal_parameter
&& (this->identifier
== NULL
)) {
2008 _mesa_glsl_error(& loc
, state
, "formal parameter lacks a name");
2013 ir_variable
*var
= new(ctx
) ir_variable(type
, this->identifier
);
2015 /* FINISHME: Handle array declarations. Note that this requires
2016 * FINISHME: complete handling of constant expressions.
2019 /* Apply any specified qualifiers to the parameter declaration. Note that
2020 * for function parameters the default mode is 'in'.
2022 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
, & loc
);
2023 if (var
->mode
== ir_var_auto
)
2024 var
->mode
= ir_var_in
;
2026 instructions
->push_tail(var
);
2028 /* Parameter declarations do not have r-values.
2035 ast_parameter_declarator::parameters_to_hir(exec_list
*ast_parameters
,
2037 exec_list
*ir_parameters
,
2038 _mesa_glsl_parse_state
*state
)
2040 ast_parameter_declarator
*void_param
= NULL
;
2043 foreach_list_typed (ast_parameter_declarator
, param
, link
, ast_parameters
) {
2044 param
->formal_parameter
= formal
;
2045 param
->hir(ir_parameters
, state
);
2053 if ((void_param
!= NULL
) && (count
> 1)) {
2054 YYLTYPE loc
= void_param
->get_location();
2056 _mesa_glsl_error(& loc
, state
,
2057 "`void' parameter must be only parameter");
2063 ast_function::hir(exec_list
*instructions
,
2064 struct _mesa_glsl_parse_state
*state
)
2067 ir_function
*f
= NULL
;
2068 ir_function_signature
*sig
= NULL
;
2069 exec_list hir_parameters
;
2071 const char *const name
= identifier
;
2073 /* Convert the list of function parameters to HIR now so that they can be
2074 * used below to compare this function's signature with previously seen
2075 * signatures for functions with the same name.
2077 ast_parameter_declarator::parameters_to_hir(& this->parameters
,
2079 & hir_parameters
, state
);
2081 const char *return_type_name
;
2082 const glsl_type
*return_type
=
2083 this->return_type
->specifier
->glsl_type(& return_type_name
, state
);
2085 assert(return_type
!= NULL
);
2087 /* From page 56 (page 62 of the PDF) of the GLSL 1.30 spec:
2088 * "No qualifier is allowed on the return type of a function."
2090 if (this->return_type
->has_qualifiers()) {
2091 YYLTYPE loc
= this->get_location();
2092 _mesa_glsl_error(& loc
, state
,
2093 "function `%s' return type has qualifiers", name
);
2096 /* Verify that this function's signature either doesn't match a previously
2097 * seen signature for a function with the same name, or, if a match is found,
2098 * that the previously seen signature does not have an associated definition.
2100 f
= state
->symbols
->get_function(name
);
2102 ir_function_signature
*sig
= f
->exact_matching_signature(&hir_parameters
);
2104 const char *badvar
= sig
->qualifiers_match(&hir_parameters
);
2105 if (badvar
!= NULL
) {
2106 YYLTYPE loc
= this->get_location();
2108 _mesa_glsl_error(&loc
, state
, "function `%s' parameter `%s' "
2109 "qualifiers don't match prototype", name
, badvar
);
2112 if (sig
->return_type
!= return_type
) {
2113 YYLTYPE loc
= this->get_location();
2115 _mesa_glsl_error(&loc
, state
, "function `%s' return type doesn't "
2116 "match prototype", name
);
2119 if (is_definition
&& sig
->is_defined
) {
2120 YYLTYPE loc
= this->get_location();
2122 _mesa_glsl_error(& loc
, state
, "function `%s' redefined", name
);
2126 } else if (state
->symbols
->name_declared_this_scope(name
)) {
2127 /* This function name shadows a non-function use of the same name.
2129 YYLTYPE loc
= this->get_location();
2131 _mesa_glsl_error(& loc
, state
, "function name `%s' conflicts with "
2132 "non-function", name
);
2135 f
= new(ctx
) ir_function(name
);
2136 state
->symbols
->add_function(f
->name
, f
);
2138 /* Emit the new function header */
2139 instructions
->push_tail(f
);
2142 /* Verify the return type of main() */
2143 if (strcmp(name
, "main") == 0) {
2144 if (! return_type
->is_void()) {
2145 YYLTYPE loc
= this->get_location();
2147 _mesa_glsl_error(& loc
, state
, "main() must return void");
2150 if (!hir_parameters
.is_empty()) {
2151 YYLTYPE loc
= this->get_location();
2153 _mesa_glsl_error(& loc
, state
, "main() must not take any parameters");
2157 /* Finish storing the information about this new function in its signature.
2160 sig
= new(ctx
) ir_function_signature(return_type
);
2161 f
->add_signature(sig
);
2164 sig
->replace_parameters(&hir_parameters
);
2167 /* Function declarations (prototypes) do not have r-values.
2174 ast_function_definition::hir(exec_list
*instructions
,
2175 struct _mesa_glsl_parse_state
*state
)
2177 prototype
->is_definition
= true;
2178 prototype
->hir(instructions
, state
);
2180 ir_function_signature
*signature
= prototype
->signature
;
2182 assert(state
->current_function
== NULL
);
2183 state
->current_function
= signature
;
2184 state
->found_return
= false;
2186 /* Duplicate parameters declared in the prototype as concrete variables.
2187 * Add these to the symbol table.
2189 state
->symbols
->push_scope();
2190 foreach_iter(exec_list_iterator
, iter
, signature
->parameters
) {
2191 ir_variable
*const var
= ((ir_instruction
*) iter
.get())->as_variable();
2193 assert(var
!= NULL
);
2195 /* The only way a parameter would "exist" is if two parameters have
2198 if (state
->symbols
->name_declared_this_scope(var
->name
)) {
2199 YYLTYPE loc
= this->get_location();
2201 _mesa_glsl_error(& loc
, state
, "parameter `%s' redeclared", var
->name
);
2203 state
->symbols
->add_variable(var
->name
, var
);
2207 /* Convert the body of the function to HIR. */
2208 this->body
->hir(&signature
->body
, state
);
2209 signature
->is_defined
= true;
2211 state
->symbols
->pop_scope();
2213 assert(state
->current_function
== signature
);
2214 state
->current_function
= NULL
;
2216 if (!signature
->return_type
->is_void() && !state
->found_return
) {
2217 YYLTYPE loc
= this->get_location();
2218 _mesa_glsl_error(& loc
, state
, "function `%s' has non-void return type "
2219 "%s, but no return statement",
2220 signature
->function_name(),
2221 signature
->return_type
->name
);
2224 /* Function definitions do not have r-values.
2231 ast_jump_statement::hir(exec_list
*instructions
,
2232 struct _mesa_glsl_parse_state
*state
)
2239 assert(state
->current_function
);
2241 if (opt_return_value
) {
2242 if (state
->current_function
->return_type
->base_type
==
2244 YYLTYPE loc
= this->get_location();
2246 _mesa_glsl_error(& loc
, state
,
2247 "`return` with a value, in function `%s' "
2249 state
->current_function
->function_name());
2252 ir_expression
*const ret
= (ir_expression
*)
2253 opt_return_value
->hir(instructions
, state
);
2254 assert(ret
!= NULL
);
2256 /* Implicit conversions are not allowed for return values. */
2257 if (state
->current_function
->return_type
!= ret
->type
) {
2258 YYLTYPE loc
= this->get_location();
2260 _mesa_glsl_error(& loc
, state
,
2261 "`return' with wrong type %s, in function `%s' "
2264 state
->current_function
->function_name(),
2265 state
->current_function
->return_type
->name
);
2268 inst
= new(ctx
) ir_return(ret
);
2270 if (state
->current_function
->return_type
->base_type
!=
2272 YYLTYPE loc
= this->get_location();
2274 _mesa_glsl_error(& loc
, state
,
2275 "`return' with no value, in function %s returning "
2277 state
->current_function
->function_name());
2279 inst
= new(ctx
) ir_return
;
2282 state
->found_return
= true;
2283 instructions
->push_tail(inst
);
2288 if (state
->target
!= fragment_shader
) {
2289 YYLTYPE loc
= this->get_location();
2291 _mesa_glsl_error(& loc
, state
,
2292 "`discard' may only appear in a fragment shader");
2294 instructions
->push_tail(new(ctx
) ir_discard
);
2299 /* FINISHME: Handle switch-statements. They cannot contain 'continue',
2300 * FINISHME: and they use a different IR instruction for 'break'.
2302 /* FINISHME: Correctly handle the nesting. If a switch-statement is
2303 * FINISHME: inside a loop, a 'continue' is valid and will bind to the
2306 if (state
->loop_or_switch_nesting
== NULL
) {
2307 YYLTYPE loc
= this->get_location();
2309 _mesa_glsl_error(& loc
, state
,
2310 "`%s' may only appear in a loop",
2311 (mode
== ast_break
) ? "break" : "continue");
2313 ir_loop
*const loop
= state
->loop_or_switch_nesting
->as_loop();
2316 ir_loop_jump
*const jump
=
2317 new(ctx
) ir_loop_jump((mode
== ast_break
)
2318 ? ir_loop_jump::jump_break
2319 : ir_loop_jump::jump_continue
);
2320 instructions
->push_tail(jump
);
2327 /* Jump instructions do not have r-values.
2334 ast_selection_statement::hir(exec_list
*instructions
,
2335 struct _mesa_glsl_parse_state
*state
)
2339 ir_rvalue
*const condition
= this->condition
->hir(instructions
, state
);
2341 /* From page 66 (page 72 of the PDF) of the GLSL 1.50 spec:
2343 * "Any expression whose type evaluates to a Boolean can be used as the
2344 * conditional expression bool-expression. Vector types are not accepted
2345 * as the expression to if."
2347 * The checks are separated so that higher quality diagnostics can be
2348 * generated for cases where both rules are violated.
2350 if (!condition
->type
->is_boolean() || !condition
->type
->is_scalar()) {
2351 YYLTYPE loc
= this->condition
->get_location();
2353 _mesa_glsl_error(& loc
, state
, "if-statement condition must be scalar "
2357 ir_if
*const stmt
= new(ctx
) ir_if(condition
);
2359 if (then_statement
!= NULL
)
2360 then_statement
->hir(& stmt
->then_instructions
, state
);
2362 if (else_statement
!= NULL
)
2363 else_statement
->hir(& stmt
->else_instructions
, state
);
2365 instructions
->push_tail(stmt
);
2367 /* if-statements do not have r-values.
2374 ast_iteration_statement::condition_to_hir(ir_loop
*stmt
,
2375 struct _mesa_glsl_parse_state
*state
)
2379 if (condition
!= NULL
) {
2380 ir_rvalue
*const cond
=
2381 condition
->hir(& stmt
->body_instructions
, state
);
2384 || !cond
->type
->is_boolean() || !cond
->type
->is_scalar()) {
2385 YYLTYPE loc
= condition
->get_location();
2387 _mesa_glsl_error(& loc
, state
,
2388 "loop condition must be scalar boolean");
2390 /* As the first code in the loop body, generate a block that looks
2391 * like 'if (!condition) break;' as the loop termination condition.
2393 ir_rvalue
*const not_cond
=
2394 new(ctx
) ir_expression(ir_unop_logic_not
, glsl_type::bool_type
, cond
,
2397 ir_if
*const if_stmt
= new(ctx
) ir_if(not_cond
);
2399 ir_jump
*const break_stmt
=
2400 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
2402 if_stmt
->then_instructions
.push_tail(break_stmt
);
2403 stmt
->body_instructions
.push_tail(if_stmt
);
2410 ast_iteration_statement::hir(exec_list
*instructions
,
2411 struct _mesa_glsl_parse_state
*state
)
2415 /* For-loops and while-loops start a new scope, but do-while loops do not.
2417 if (mode
!= ast_do_while
)
2418 state
->symbols
->push_scope();
2420 if (init_statement
!= NULL
)
2421 init_statement
->hir(instructions
, state
);
2423 ir_loop
*const stmt
= new(ctx
) ir_loop();
2424 instructions
->push_tail(stmt
);
2426 /* Track the current loop and / or switch-statement nesting.
2428 ir_instruction
*const nesting
= state
->loop_or_switch_nesting
;
2429 state
->loop_or_switch_nesting
= stmt
;
2431 if (mode
!= ast_do_while
)
2432 condition_to_hir(stmt
, state
);
2435 body
->hir(& stmt
->body_instructions
, state
);
2437 if (rest_expression
!= NULL
)
2438 rest_expression
->hir(& stmt
->body_instructions
, state
);
2440 if (mode
== ast_do_while
)
2441 condition_to_hir(stmt
, state
);
2443 if (mode
!= ast_do_while
)
2444 state
->symbols
->pop_scope();
2446 /* Restore previous nesting before returning.
2448 state
->loop_or_switch_nesting
= nesting
;
2450 /* Loops do not have r-values.
2457 ast_type_specifier::hir(exec_list
*instructions
,
2458 struct _mesa_glsl_parse_state
*state
)
2460 if (this->structure
!= NULL
)
2461 return this->structure
->hir(instructions
, state
);
2468 ast_struct_specifier::hir(exec_list
*instructions
,
2469 struct _mesa_glsl_parse_state
*state
)
2471 unsigned decl_count
= 0;
2473 /* Make an initial pass over the list of structure fields to determine how
2474 * many there are. Each element in this list is an ast_declarator_list.
2475 * This means that we actually need to count the number of elements in the
2476 * 'declarations' list in each of the elements.
2478 foreach_list_typed (ast_declarator_list
, decl_list
, link
,
2479 &this->declarations
) {
2480 foreach_list_const (decl_ptr
, & decl_list
->declarations
) {
2486 /* Allocate storage for the structure fields and process the field
2487 * declarations. As the declarations are processed, try to also convert
2488 * the types to HIR. This ensures that structure definitions embedded in
2489 * other structure definitions are processed.
2491 glsl_struct_field
*const fields
= (glsl_struct_field
*)
2492 malloc(sizeof(*fields
) * decl_count
);
2495 foreach_list_typed (ast_declarator_list
, decl_list
, link
,
2496 &this->declarations
) {
2497 const char *type_name
;
2499 decl_list
->type
->specifier
->hir(instructions
, state
);
2501 const glsl_type
*decl_type
=
2502 decl_list
->type
->specifier
->glsl_type(& type_name
, state
);
2504 foreach_list_typed (ast_declaration
, decl
, link
,
2505 &decl_list
->declarations
) {
2506 const struct glsl_type
*const field_type
=
2508 ? process_array_type(decl_type
, decl
->array_size
, state
)
2511 fields
[i
].type
= (field_type
!= NULL
)
2512 ? field_type
: glsl_type::error_type
;
2513 fields
[i
].name
= decl
->identifier
;
2518 assert(i
== decl_count
);
2521 if (this->name
== NULL
) {
2522 static unsigned anon_count
= 1;
2525 snprintf(buf
, sizeof(buf
), "#anon_struct_%04x", anon_count
);
2533 const glsl_type
*t
=
2534 glsl_type::get_record_instance(fields
, decl_count
, name
);
2536 YYLTYPE loc
= this->get_location();
2537 if (!state
->symbols
->add_type(name
, t
)) {
2538 _mesa_glsl_error(& loc
, state
, "struct `%s' previously defined", name
);
2540 /* This logic is a bit tricky. It is an error to declare a structure at
2541 * global scope if there is also a function with the same name.
2543 if ((state
->current_function
== NULL
)
2544 && (state
->symbols
->get_function(name
) != NULL
)) {
2545 _mesa_glsl_error(& loc
, state
, "name `%s' previously defined", name
);
2547 t
->generate_constructor(state
->symbols
);
2550 const glsl_type
**s
= (const glsl_type
**)
2551 realloc(state
->user_structures
,
2552 sizeof(state
->user_structures
[0]) *
2553 (state
->num_user_structures
+ 1));
2555 s
[state
->num_user_structures
] = t
;
2556 state
->user_structures
= s
;
2557 state
->num_user_structures
++;
2561 /* Structure type definitions do not have r-values.