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 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 error_emitted
= op
[0]->type
->is_error();
683 if (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_if
*const stmt
= new(ctx
) ir_if(op
[0]);
829 instructions
->push_tail(stmt
);
831 op
[1] = this->subexpressions
[1]->hir(&stmt
->then_instructions
, state
);
833 if (!op
[1]->type
->is_boolean() || !op
[1]->type
->is_scalar()) {
834 YYLTYPE loc
= this->subexpressions
[1]->get_location();
836 _mesa_glsl_error(& loc
, state
,
837 "RHS of `%s' must be scalar boolean",
838 operator_string(this->oper
));
839 error_emitted
= true;
842 ir_variable
*const tmp
= generate_temporary(glsl_type::bool_type
,
843 instructions
, state
);
845 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
846 ir_assignment
*const then_assign
=
847 new(ctx
) ir_assignment(then_deref
, op
[1], NULL
);
848 stmt
->then_instructions
.push_tail(then_assign
);
850 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
851 ir_assignment
*const else_assign
=
852 new(ctx
) ir_assignment(else_deref
, new(ctx
) ir_constant(false), NULL
);
853 stmt
->else_instructions
.push_tail(else_assign
);
855 result
= new(ctx
) ir_dereference_variable(tmp
);
862 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
864 if (!op
[0]->type
->is_boolean() || !op
[0]->type
->is_scalar()) {
865 YYLTYPE loc
= this->subexpressions
[0]->get_location();
867 _mesa_glsl_error(& loc
, state
, "LHS of `%s' must be scalar boolean",
868 operator_string(this->oper
));
869 error_emitted
= true;
872 ir_constant
*op0_const
= op
[0]->constant_expression_value();
874 if (op0_const
->value
.b
[0]) {
877 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
879 if (!op
[1]->type
->is_boolean() || !op
[1]->type
->is_scalar()) {
880 YYLTYPE loc
= this->subexpressions
[1]->get_location();
882 _mesa_glsl_error(& loc
, state
,
883 "RHS of `%s' must be scalar boolean",
884 operator_string(this->oper
));
885 error_emitted
= true;
889 type
= glsl_type::bool_type
;
891 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
892 instructions
->push_tail(stmt
);
894 ir_variable
*const tmp
= generate_temporary(glsl_type::bool_type
,
895 instructions
, state
);
897 op
[1] = this->subexpressions
[1]->hir(&stmt
->then_instructions
, state
);
899 if (!op
[1]->type
->is_boolean() || !op
[1]->type
->is_scalar()) {
900 YYLTYPE loc
= this->subexpressions
[1]->get_location();
902 _mesa_glsl_error(& loc
, state
, "RHS of `%s' must be scalar boolean",
903 operator_string(this->oper
));
904 error_emitted
= true;
907 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
908 ir_assignment
*const then_assign
=
909 new(ctx
) ir_assignment(then_deref
, new(ctx
) ir_constant(true), NULL
);
910 stmt
->then_instructions
.push_tail(then_assign
);
912 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
913 ir_assignment
*const else_assign
=
914 new(ctx
) ir_assignment(else_deref
, op
[1], NULL
);
915 stmt
->else_instructions
.push_tail(else_assign
);
917 result
= new(ctx
) ir_dereference_variable(tmp
);
924 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
925 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
928 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
930 type
= glsl_type::bool_type
;
934 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
936 if (!op
[0]->type
->is_boolean() || !op
[0]->type
->is_scalar()) {
937 YYLTYPE loc
= this->subexpressions
[0]->get_location();
939 _mesa_glsl_error(& loc
, state
,
940 "operand of `!' must be scalar boolean");
941 error_emitted
= true;
944 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
946 type
= glsl_type::bool_type
;
952 case ast_sub_assign
: {
953 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
954 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
956 type
= arithmetic_result_type(op
[0], op
[1],
957 (this->oper
== ast_mul_assign
),
960 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
963 result
= do_assignment(instructions
, state
,
964 op
[0]->clone(NULL
), temp_rhs
,
965 this->subexpressions
[0]->get_location());
967 error_emitted
= (op
[0]->type
->is_error());
969 /* GLSL 1.10 does not allow array assignment. However, we don't have to
970 * explicitly test for this because none of the binary expression
971 * operators allow array operands either.
977 case ast_mod_assign
: {
978 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
979 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
981 type
= modulus_result_type(op
[0]->type
, op
[1]->type
, state
, & loc
);
983 assert(operations
[this->oper
] == ir_binop_mod
);
985 struct ir_rvalue
*temp_rhs
;
986 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
989 result
= do_assignment(instructions
, state
,
990 op
[0]->clone(NULL
), temp_rhs
,
991 this->subexpressions
[0]->get_location());
993 error_emitted
= type
->is_error();
999 _mesa_glsl_error(& loc
, state
,
1000 "FINISHME: implement bit-shift assignment operators");
1001 error_emitted
= true;
1004 case ast_and_assign
:
1005 case ast_xor_assign
:
1007 _mesa_glsl_error(& loc
, state
,
1008 "FINISHME: implement logic assignment operators");
1009 error_emitted
= true;
1012 case ast_conditional
: {
1013 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1015 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1017 * "The ternary selection operator (?:). It operates on three
1018 * expressions (exp1 ? exp2 : exp3). This operator evaluates the
1019 * first expression, which must result in a scalar Boolean."
1021 if (!op
[0]->type
->is_boolean() || !op
[0]->type
->is_scalar()) {
1022 YYLTYPE loc
= this->subexpressions
[0]->get_location();
1024 _mesa_glsl_error(& loc
, state
, "?: condition must be scalar boolean");
1025 error_emitted
= true;
1028 /* The :? operator is implemented by generating an anonymous temporary
1029 * followed by an if-statement. The last instruction in each branch of
1030 * the if-statement assigns a value to the anonymous temporary. This
1031 * temporary is the r-value of the expression.
1033 exec_list then_instructions
;
1034 exec_list else_instructions
;
1036 op
[1] = this->subexpressions
[1]->hir(&then_instructions
, state
);
1037 op
[2] = this->subexpressions
[2]->hir(&else_instructions
, state
);
1039 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1041 * "The second and third expressions can be any type, as
1042 * long their types match, or there is a conversion in
1043 * Section 4.1.10 "Implicit Conversions" that can be applied
1044 * to one of the expressions to make their types match. This
1045 * resulting matching type is the type of the entire
1048 if ((!apply_implicit_conversion(op
[1]->type
, op
[2], state
)
1049 && !apply_implicit_conversion(op
[2]->type
, op
[1], state
))
1050 || (op
[1]->type
!= op
[2]->type
)) {
1051 YYLTYPE loc
= this->subexpressions
[1]->get_location();
1053 _mesa_glsl_error(& loc
, state
, "Second and third operands of ?: "
1054 "operator must have matching types.");
1055 error_emitted
= true;
1056 type
= glsl_type::error_type
;
1061 ir_constant
*cond_val
= op
[0]->constant_expression_value();
1062 ir_constant
*then_val
= op
[1]->constant_expression_value();
1063 ir_constant
*else_val
= op
[2]->constant_expression_value();
1065 if (then_instructions
.is_empty()
1066 && else_instructions
.is_empty()
1067 && (cond_val
!= NULL
) && (then_val
!= NULL
) && (else_val
!= NULL
)) {
1068 result
= (cond_val
->value
.b
[0]) ? then_val
: else_val
;
1070 ir_variable
*const tmp
= generate_temporary(type
,
1071 instructions
, state
);
1073 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1074 instructions
->push_tail(stmt
);
1076 then_instructions
.move_nodes_to(& stmt
->then_instructions
);
1077 ir_dereference
*const then_deref
=
1078 new(ctx
) ir_dereference_variable(tmp
);
1079 ir_assignment
*const then_assign
=
1080 new(ctx
) ir_assignment(then_deref
, op
[1], NULL
);
1081 stmt
->then_instructions
.push_tail(then_assign
);
1083 else_instructions
.move_nodes_to(& stmt
->else_instructions
);
1084 ir_dereference
*const else_deref
=
1085 new(ctx
) ir_dereference_variable(tmp
);
1086 ir_assignment
*const else_assign
=
1087 new(ctx
) ir_assignment(else_deref
, op
[2], NULL
);
1088 stmt
->else_instructions
.push_tail(else_assign
);
1090 result
= new(ctx
) ir_dereference_variable(tmp
);
1097 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1098 if (op
[0]->type
->base_type
== GLSL_TYPE_FLOAT
)
1099 op
[1] = new(ctx
) ir_constant(1.0f
);
1101 op
[1] = new(ctx
) ir_constant(1);
1103 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1105 struct ir_rvalue
*temp_rhs
;
1106 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1109 result
= do_assignment(instructions
, state
,
1110 op
[0]->clone(NULL
), temp_rhs
,
1111 this->subexpressions
[0]->get_location());
1112 type
= result
->type
;
1113 error_emitted
= op
[0]->type
->is_error();
1118 case ast_post_dec
: {
1119 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1120 if (op
[0]->type
->base_type
== GLSL_TYPE_FLOAT
)
1121 op
[1] = new(ctx
) ir_constant(1.0f
);
1123 op
[1] = new(ctx
) ir_constant(1);
1125 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1127 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1129 struct ir_rvalue
*temp_rhs
;
1130 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1133 /* Get a temporary of a copy of the lvalue before it's modified.
1134 * This may get thrown away later.
1136 result
= get_lvalue_copy(instructions
, op
[0]->clone(NULL
));
1138 (void)do_assignment(instructions
, state
,
1139 op
[0]->clone(NULL
), temp_rhs
,
1140 this->subexpressions
[0]->get_location());
1142 type
= result
->type
;
1143 error_emitted
= op
[0]->type
->is_error();
1147 case ast_field_selection
:
1148 result
= _mesa_ast_field_selection_to_hir(this, instructions
, state
);
1149 type
= result
->type
;
1152 case ast_array_index
: {
1153 YYLTYPE index_loc
= subexpressions
[1]->get_location();
1155 op
[0] = subexpressions
[0]->hir(instructions
, state
);
1156 op
[1] = subexpressions
[1]->hir(instructions
, state
);
1158 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1160 ir_rvalue
*const array
= op
[0];
1162 result
= new(ctx
) ir_dereference_array(op
[0], op
[1]);
1164 /* Do not use op[0] after this point. Use array.
1172 if (!array
->type
->is_array()
1173 && !array
->type
->is_matrix()
1174 && !array
->type
->is_vector()) {
1175 _mesa_glsl_error(& index_loc
, state
,
1176 "cannot dereference non-array / non-matrix / "
1178 error_emitted
= true;
1181 if (!op
[1]->type
->is_integer()) {
1182 _mesa_glsl_error(& index_loc
, state
,
1183 "array index must be integer type");
1184 error_emitted
= true;
1185 } else if (!op
[1]->type
->is_scalar()) {
1186 _mesa_glsl_error(& index_loc
, state
,
1187 "array index must be scalar");
1188 error_emitted
= true;
1191 /* If the array index is a constant expression and the array has a
1192 * declared size, ensure that the access is in-bounds. If the array
1193 * index is not a constant expression, ensure that the array has a
1196 ir_constant
*const const_index
= op
[1]->constant_expression_value();
1197 if (const_index
!= NULL
) {
1198 const int idx
= const_index
->value
.i
[0];
1199 const char *type_name
;
1202 if (array
->type
->is_matrix()) {
1203 type_name
= "matrix";
1204 } else if (array
->type
->is_vector()) {
1205 type_name
= "vector";
1207 type_name
= "array";
1210 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec:
1212 * "It is illegal to declare an array with a size, and then
1213 * later (in the same shader) index the same array with an
1214 * integral constant expression greater than or equal to the
1215 * declared size. It is also illegal to index an array with a
1216 * negative constant expression."
1218 if (array
->type
->is_matrix()) {
1219 if (array
->type
->row_type()->vector_elements
<= idx
) {
1220 bound
= array
->type
->row_type()->vector_elements
;
1222 } else if (array
->type
->is_vector()) {
1223 if (array
->type
->vector_elements
<= idx
) {
1224 bound
= array
->type
->vector_elements
;
1227 if ((array
->type
->array_size() > 0)
1228 && (array
->type
->array_size() <= idx
)) {
1229 bound
= array
->type
->array_size();
1234 _mesa_glsl_error(& loc
, state
, "%s index must be < %u",
1236 error_emitted
= true;
1237 } else if (idx
< 0) {
1238 _mesa_glsl_error(& loc
, state
, "%s index must be >= 0",
1240 error_emitted
= true;
1243 if (array
->type
->is_array()) {
1244 /* If the array is a variable dereference, it dereferences the
1245 * whole array, by definition. Use this to get the variable.
1247 * FINISHME: Should some methods for getting / setting / testing
1248 * FINISHME: array access limits be added to ir_dereference?
1250 ir_variable
*const v
= array
->whole_variable_referenced();
1251 if ((v
!= NULL
) && (unsigned(idx
) > v
->max_array_access
))
1252 v
->max_array_access
= idx
;
1257 result
->type
= glsl_type::error_type
;
1259 type
= result
->type
;
1263 case ast_function_call
:
1264 /* Should *NEVER* get here. ast_function_call should always be handled
1265 * by ast_function_expression::hir.
1270 case ast_identifier
: {
1271 /* ast_identifier can appear several places in a full abstract syntax
1272 * tree. This particular use must be at location specified in the grammar
1273 * as 'variable_identifier'.
1276 state
->symbols
->get_variable(this->primary_expression
.identifier
);
1278 result
= new(ctx
) ir_dereference_variable(var
);
1281 type
= result
->type
;
1283 _mesa_glsl_error(& loc
, state
, "`%s' undeclared",
1284 this->primary_expression
.identifier
);
1286 error_emitted
= true;
1291 case ast_int_constant
:
1292 type
= glsl_type::int_type
;
1293 result
= new(ctx
) ir_constant(this->primary_expression
.int_constant
);
1296 case ast_uint_constant
:
1297 type
= glsl_type::uint_type
;
1298 result
= new(ctx
) ir_constant(this->primary_expression
.uint_constant
);
1301 case ast_float_constant
:
1302 type
= glsl_type::float_type
;
1303 result
= new(ctx
) ir_constant(this->primary_expression
.float_constant
);
1306 case ast_bool_constant
:
1307 type
= glsl_type::bool_type
;
1308 result
= new(ctx
) ir_constant(bool(this->primary_expression
.bool_constant
));
1311 case ast_sequence
: {
1312 /* It should not be possible to generate a sequence in the AST without
1313 * any expressions in it.
1315 assert(!this->expressions
.is_empty());
1317 /* The r-value of a sequence is the last expression in the sequence. If
1318 * the other expressions in the sequence do not have side-effects (and
1319 * therefore add instructions to the instruction list), they get dropped
1322 foreach_list_typed (ast_node
, ast
, link
, &this->expressions
)
1323 result
= ast
->hir(instructions
, state
);
1325 type
= result
->type
;
1327 /* Any errors should have already been emitted in the loop above.
1329 error_emitted
= true;
1334 if (type
->is_error() && !error_emitted
)
1335 _mesa_glsl_error(& loc
, state
, "type mismatch");
1342 ast_expression_statement::hir(exec_list
*instructions
,
1343 struct _mesa_glsl_parse_state
*state
)
1345 /* It is possible to have expression statements that don't have an
1346 * expression. This is the solitary semicolon:
1348 * for (i = 0; i < 5; i++)
1351 * In this case the expression will be NULL. Test for NULL and don't do
1352 * anything in that case.
1354 if (expression
!= NULL
)
1355 expression
->hir(instructions
, state
);
1357 /* Statements do not have r-values.
1364 ast_compound_statement::hir(exec_list
*instructions
,
1365 struct _mesa_glsl_parse_state
*state
)
1368 state
->symbols
->push_scope();
1370 foreach_list_typed (ast_node
, ast
, link
, &this->statements
)
1371 ast
->hir(instructions
, state
);
1374 state
->symbols
->pop_scope();
1376 /* Compound statements do not have r-values.
1382 static const glsl_type
*
1383 process_array_type(const glsl_type
*base
, ast_node
*array_size
,
1384 struct _mesa_glsl_parse_state
*state
)
1386 unsigned length
= 0;
1388 /* FINISHME: Reject delcarations of multidimensional arrays. */
1390 if (array_size
!= NULL
) {
1391 exec_list dummy_instructions
;
1392 ir_rvalue
*const ir
= array_size
->hir(& dummy_instructions
, state
);
1393 YYLTYPE loc
= array_size
->get_location();
1395 /* FINISHME: Verify that the grammar forbids side-effects in array
1396 * FINISHME: sizes. i.e., 'vec4 [x = 12] data'
1398 assert(dummy_instructions
.is_empty());
1401 if (!ir
->type
->is_integer()) {
1402 _mesa_glsl_error(& loc
, state
, "array size must be integer type");
1403 } else if (!ir
->type
->is_scalar()) {
1404 _mesa_glsl_error(& loc
, state
, "array size must be scalar type");
1406 ir_constant
*const size
= ir
->constant_expression_value();
1409 _mesa_glsl_error(& loc
, state
, "array size must be a "
1410 "constant valued expression");
1411 } else if (size
->value
.i
[0] <= 0) {
1412 _mesa_glsl_error(& loc
, state
, "array size must be > 0");
1414 assert(size
->type
== ir
->type
);
1415 length
= size
->value
.u
[0];
1421 return glsl_type::get_array_instance(state
, base
, length
);
1426 ast_type_specifier::glsl_type(const char **name
,
1427 struct _mesa_glsl_parse_state
*state
) const
1429 const struct glsl_type
*type
;
1431 if ((this->type_specifier
== ast_struct
) && (this->type_name
== NULL
)) {
1432 /* FINISHME: Handle annonymous structures. */
1435 type
= state
->symbols
->get_type(this->type_name
);
1436 *name
= this->type_name
;
1438 if (this->is_array
) {
1439 type
= process_array_type(type
, this->array_size
, state
);
1448 apply_type_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
1449 struct ir_variable
*var
,
1450 struct _mesa_glsl_parse_state
*state
,
1453 if (qual
->invariant
)
1456 /* FINISHME: Mark 'in' variables at global scope as read-only. */
1457 if (qual
->constant
|| qual
->attribute
|| qual
->uniform
1458 || (qual
->varying
&& (state
->target
== fragment_shader
)))
1464 if (qual
->attribute
&& state
->target
!= vertex_shader
) {
1465 var
->type
= glsl_type::error_type
;
1466 _mesa_glsl_error(loc
, state
,
1467 "`attribute' variables may not be declared in the "
1469 _mesa_glsl_shader_target_name(state
->target
));
1472 /* From page 25 (page 31 of the PDF) of the GLSL 1.10 spec:
1474 * "The varying qualifier can be used only with the data types
1475 * float, vec2, vec3, vec4, mat2, mat3, and mat4, or arrays of
1478 if (qual
->varying
) {
1479 const glsl_type
*non_array_type
;
1481 if (var
->type
&& var
->type
->is_array())
1482 non_array_type
= var
->type
->fields
.array
;
1484 non_array_type
= var
->type
;
1486 if (non_array_type
&& non_array_type
->base_type
!= GLSL_TYPE_FLOAT
) {
1487 var
->type
= glsl_type::error_type
;
1488 _mesa_glsl_error(loc
, state
,
1489 "varying variables must be of base type float");
1493 if (qual
->in
&& qual
->out
)
1494 var
->mode
= ir_var_inout
;
1495 else if (qual
->attribute
|| qual
->in
1496 || (qual
->varying
&& (state
->target
== fragment_shader
)))
1497 var
->mode
= ir_var_in
;
1498 else if (qual
->out
|| (qual
->varying
&& (state
->target
== vertex_shader
)))
1499 var
->mode
= ir_var_out
;
1500 else if (qual
->uniform
)
1501 var
->mode
= ir_var_uniform
;
1503 var
->mode
= ir_var_auto
;
1506 var
->shader_in
= true;
1508 /* Any 'in' or 'inout' variables at global scope must be marked as being
1509 * shader inputs. Likewise, any 'out' or 'inout' variables at global scope
1510 * must be marked as being shader outputs.
1512 if (state
->current_function
== NULL
) {
1513 switch (var
->mode
) {
1515 case ir_var_uniform
:
1516 var
->shader_in
= true;
1519 var
->shader_out
= true;
1522 var
->shader_in
= true;
1523 var
->shader_out
= true;
1531 var
->interpolation
= ir_var_flat
;
1532 else if (qual
->noperspective
)
1533 var
->interpolation
= ir_var_noperspective
;
1535 var
->interpolation
= ir_var_smooth
;
1537 if (var
->type
->is_array() && (state
->language_version
>= 120)) {
1538 var
->array_lvalue
= true;
1544 ast_declarator_list::hir(exec_list
*instructions
,
1545 struct _mesa_glsl_parse_state
*state
)
1548 const struct glsl_type
*decl_type
;
1549 const char *type_name
= NULL
;
1550 ir_rvalue
*result
= NULL
;
1551 YYLTYPE loc
= this->get_location();
1553 /* From page 46 (page 52 of the PDF) of the GLSL 1.50 spec:
1555 * "To ensure that a particular output variable is invariant, it is
1556 * necessary to use the invariant qualifier. It can either be used to
1557 * qualify a previously declared variable as being invariant
1559 * invariant gl_Position; // make existing gl_Position be invariant"
1561 * In these cases the parser will set the 'invariant' flag in the declarator
1562 * list, and the type will be NULL.
1564 if (this->invariant
) {
1565 assert(this->type
== NULL
);
1567 if (state
->current_function
!= NULL
) {
1568 _mesa_glsl_error(& loc
, state
,
1569 "All uses of `invariant' keyword must be at global "
1573 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
1574 assert(!decl
->is_array
);
1575 assert(decl
->array_size
== NULL
);
1576 assert(decl
->initializer
== NULL
);
1578 ir_variable
*const earlier
=
1579 state
->symbols
->get_variable(decl
->identifier
);
1580 if (earlier
== NULL
) {
1581 _mesa_glsl_error(& loc
, state
,
1582 "Undeclared variable `%s' cannot be marked "
1583 "invariant\n", decl
->identifier
);
1584 } else if ((state
->target
== vertex_shader
)
1585 && (earlier
->mode
!= ir_var_out
)) {
1586 _mesa_glsl_error(& loc
, state
,
1587 "`%s' cannot be marked invariant, vertex shader "
1588 "outputs only\n", decl
->identifier
);
1589 } else if ((state
->target
== fragment_shader
)
1590 && (earlier
->mode
!= ir_var_in
)) {
1591 _mesa_glsl_error(& loc
, state
,
1592 "`%s' cannot be marked invariant, fragment shader "
1593 "inputs only\n", decl
->identifier
);
1595 earlier
->invariant
= true;
1599 /* Invariant redeclarations do not have r-values.
1604 assert(this->type
!= NULL
);
1605 assert(!this->invariant
);
1607 /* The type specifier may contain a structure definition. Process that
1608 * before any of the variable declarations.
1610 (void) this->type
->specifier
->hir(instructions
, state
);
1612 decl_type
= this->type
->specifier
->glsl_type(& type_name
, state
);
1613 if (this->declarations
.is_empty()) {
1614 /* The only valid case where the declaration list can be empty is when
1615 * the declaration is setting the default precision of a built-in type
1616 * (e.g., 'precision highp vec4;').
1619 if (decl_type
!= NULL
) {
1621 _mesa_glsl_error(& loc
, state
, "incomplete declaration");
1625 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
1626 const struct glsl_type
*var_type
;
1627 struct ir_variable
*var
;
1629 /* FINISHME: Emit a warning if a variable declaration shadows a
1630 * FINISHME: declaration at a higher scope.
1633 if ((decl_type
== NULL
) || decl_type
->is_void()) {
1634 if (type_name
!= NULL
) {
1635 _mesa_glsl_error(& loc
, state
,
1636 "invalid type `%s' in declaration of `%s'",
1637 type_name
, decl
->identifier
);
1639 _mesa_glsl_error(& loc
, state
,
1640 "invalid type in declaration of `%s'",
1646 if (decl
->is_array
) {
1647 var_type
= process_array_type(decl_type
, decl
->array_size
, state
);
1649 var_type
= decl_type
;
1652 var
= new(ctx
) ir_variable(var_type
, decl
->identifier
);
1654 /* From page 22 (page 28 of the PDF) of the GLSL 1.10 specification;
1656 * "Global variables can only use the qualifiers const,
1657 * attribute, uni form, or varying. Only one may be
1660 * Local variables can only use the qualifier const."
1662 * This is relaxed in GLSL 1.30.
1664 if (state
->language_version
< 120) {
1665 if (this->type
->qualifier
.out
) {
1666 _mesa_glsl_error(& loc
, state
,
1667 "`out' qualifier in declaration of `%s' "
1668 "only valid for function parameters in GLSL 1.10.",
1671 if (this->type
->qualifier
.in
) {
1672 _mesa_glsl_error(& loc
, state
,
1673 "`in' qualifier in declaration of `%s' "
1674 "only valid for function parameters in GLSL 1.10.",
1677 /* FINISHME: Test for other invalid qualifiers. */
1680 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
,
1683 if (this->type
->qualifier
.invariant
) {
1684 if ((state
->target
== vertex_shader
) && !var
->shader_out
) {
1685 _mesa_glsl_error(& loc
, state
,
1686 "`%s' cannot be marked invariant, vertex shader "
1687 "outputs only\n", var
->name
);
1688 } else if ((state
->target
== fragment_shader
) && !var
->shader_in
) {
1689 _mesa_glsl_error(& loc
, state
,
1690 "`%s' cannot be marked invariant, fragment shader "
1691 "inputs only\n", var
->name
);
1695 if (state
->current_function
!= NULL
) {
1696 const char *mode
= NULL
;
1697 const char *extra
= "";
1699 /* There is no need to check for 'inout' here because the parser will
1700 * only allow that in function parameter lists.
1702 if (this->type
->qualifier
.attribute
) {
1704 } else if (this->type
->qualifier
.uniform
) {
1706 } else if (this->type
->qualifier
.varying
) {
1708 } else if (this->type
->qualifier
.in
) {
1710 extra
= " or in function parameter list";
1711 } else if (this->type
->qualifier
.out
) {
1713 extra
= " or in function parameter list";
1717 _mesa_glsl_error(& loc
, state
,
1718 "%s variable `%s' must be declared at "
1720 mode
, var
->name
, extra
);
1722 } else if (var
->mode
== ir_var_in
) {
1723 if (state
->target
== vertex_shader
) {
1724 bool error_emitted
= false;
1726 /* From page 31 (page 37 of the PDF) of the GLSL 1.50 spec:
1728 * "Vertex shader inputs can only be float, floating-point
1729 * vectors, matrices, signed and unsigned integers and integer
1730 * vectors. Vertex shader inputs can also form arrays of these
1731 * types, but not structures."
1733 * From page 31 (page 27 of the PDF) of the GLSL 1.30 spec:
1735 * "Vertex shader inputs can only be float, floating-point
1736 * vectors, matrices, signed and unsigned integers and integer
1737 * vectors. They cannot be arrays or structures."
1739 * From page 23 (page 29 of the PDF) of the GLSL 1.20 spec:
1741 * "The attribute qualifier can be used only with float,
1742 * floating-point vectors, and matrices. Attribute variables
1743 * cannot be declared as arrays or structures."
1745 const glsl_type
*check_type
= var
->type
->is_array()
1746 ? var
->type
->fields
.array
: var
->type
;
1748 switch (check_type
->base_type
) {
1749 case GLSL_TYPE_FLOAT
:
1751 case GLSL_TYPE_UINT
:
1753 if (state
->language_version
> 120)
1757 _mesa_glsl_error(& loc
, state
,
1758 "vertex shader input / attribute cannot have "
1760 var
->type
->is_array() ? "array of " : "",
1762 error_emitted
= true;
1765 if (!error_emitted
&& (state
->language_version
<= 130)
1766 && var
->type
->is_array()) {
1767 _mesa_glsl_error(& loc
, state
,
1768 "vertex shader input / attribute cannot have "
1770 error_emitted
= true;
1775 if (decl
->initializer
!= NULL
) {
1776 YYLTYPE initializer_loc
= decl
->initializer
->get_location();
1778 /* From page 24 (page 30 of the PDF) of the GLSL 1.10 spec:
1780 * "All uniform variables are read-only and are initialized either
1781 * directly by an application via API commands, or indirectly by
1784 if ((state
->language_version
<= 110)
1785 && (var
->mode
== ir_var_uniform
)) {
1786 _mesa_glsl_error(& initializer_loc
, state
,
1787 "cannot initialize uniforms in GLSL 1.10");
1790 if (var
->type
->is_sampler()) {
1791 _mesa_glsl_error(& initializer_loc
, state
,
1792 "cannot initialize samplers");
1795 if ((var
->mode
== ir_var_in
) && (state
->current_function
== NULL
)) {
1796 _mesa_glsl_error(& initializer_loc
, state
,
1797 "cannot initialize %s shader input / %s",
1798 _mesa_glsl_shader_target_name(state
->target
),
1799 (state
->target
== vertex_shader
)
1800 ? "attribute" : "varying");
1803 ir_dereference
*const lhs
= new(ctx
) ir_dereference_variable(var
);
1804 ir_rvalue
*rhs
= decl
->initializer
->hir(instructions
, state
);
1806 /* Calculate the constant value if this is a const or uniform
1809 if (this->type
->qualifier
.constant
|| this->type
->qualifier
.uniform
) {
1810 ir_constant
*constant_value
= rhs
->constant_expression_value();
1811 if (!constant_value
) {
1812 _mesa_glsl_error(& initializer_loc
, state
,
1813 "initializer of %s variable `%s' must be a "
1814 "constant expression",
1815 (this->type
->qualifier
.constant
)
1816 ? "const" : "uniform",
1819 rhs
= constant_value
;
1820 var
->constant_value
= constant_value
;
1824 if (rhs
&& !rhs
->type
->is_error()) {
1825 bool temp
= var
->read_only
;
1826 if (this->type
->qualifier
.constant
)
1827 var
->read_only
= false;
1829 /* Never emit code to initialize a uniform.
1831 if (!this->type
->qualifier
.uniform
)
1832 result
= do_assignment(instructions
, state
, lhs
, rhs
,
1833 this->get_location());
1834 var
->read_only
= temp
;
1838 /* From page 23 (page 29 of the PDF) of the GLSL 1.10 spec:
1840 * "It is an error to write to a const variable outside of
1841 * its declaration, so they must be initialized when
1844 if (this->type
->qualifier
.constant
&& decl
->initializer
== NULL
) {
1845 _mesa_glsl_error(& loc
, state
,
1846 "const declaration of `%s' must be initialized");
1849 /* Attempt to add the variable to the symbol table. If this fails, it
1850 * means the variable has already been declared at this scope. Arrays
1851 * fudge this rule a little bit.
1853 * From page 24 (page 30 of the PDF) of the GLSL 1.50 spec,
1855 * "It is legal to declare an array without a size and then
1856 * later re-declare the same name as an array of the same
1857 * type and specify a size."
1859 if (state
->symbols
->name_declared_this_scope(decl
->identifier
)) {
1860 ir_variable
*const earlier
=
1861 state
->symbols
->get_variable(decl
->identifier
);
1863 if ((earlier
!= NULL
)
1864 && (earlier
->type
->array_size() == 0)
1865 && var
->type
->is_array()
1866 && (var
->type
->element_type() == earlier
->type
->element_type())) {
1867 /* FINISHME: This doesn't match the qualifiers on the two
1868 * FINISHME: declarations. It's not 100% clear whether this is
1869 * FINISHME: required or not.
1872 /* From page 54 (page 60 of the PDF) of the GLSL 1.20 spec:
1874 * "The size [of gl_TexCoord] can be at most
1875 * gl_MaxTextureCoords."
1877 const unsigned size
= unsigned(var
->type
->array_size());
1878 if ((strcmp("gl_TexCoord", var
->name
) == 0)
1879 && (size
> state
->Const
.MaxTextureCoords
)) {
1880 YYLTYPE loc
= this->get_location();
1882 _mesa_glsl_error(& loc
, state
, "`gl_TexCoord' array size cannot "
1883 "be larger than gl_MaxTextureCoords (%u)\n",
1884 state
->Const
.MaxTextureCoords
);
1885 } else if ((size
> 0) && (size
<= earlier
->max_array_access
)) {
1886 YYLTYPE loc
= this->get_location();
1888 _mesa_glsl_error(& loc
, state
, "array size must be > %u due to "
1890 earlier
->max_array_access
);
1893 earlier
->type
= var
->type
;
1897 YYLTYPE loc
= this->get_location();
1899 _mesa_glsl_error(& loc
, state
, "`%s' redeclared",
1906 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
1908 * "Identifiers starting with "gl_" are reserved for use by
1909 * OpenGL, and may not be declared in a shader as either a
1910 * variable or a function."
1912 if (strncmp(decl
->identifier
, "gl_", 3) == 0) {
1913 /* FINISHME: This should only trigger if we're not redefining
1914 * FINISHME: a builtin (to add a qualifier, for example).
1916 _mesa_glsl_error(& loc
, state
,
1917 "identifier `%s' uses reserved `gl_' prefix",
1921 instructions
->push_tail(var
);
1923 /* Add the variable to the symbol table after processing the initializer.
1924 * This differs from most C-like languages, but it follows the GLSL
1925 * specification. From page 28 (page 34 of the PDF) of the GLSL 1.50
1928 * "Within a declaration, the scope of a name starts immediately
1929 * after the initializer if present or immediately after the name
1930 * being declared if not."
1932 const bool added_variable
=
1933 state
->symbols
->add_variable(var
->name
, var
);
1934 assert(added_variable
);
1938 /* Generally, variable declarations do not have r-values. However,
1939 * one is used for the declaration in
1941 * while (bool b = some_condition()) {
1945 * so we return the rvalue from the last seen declaration here.
1952 ast_parameter_declarator::hir(exec_list
*instructions
,
1953 struct _mesa_glsl_parse_state
*state
)
1956 const struct glsl_type
*type
;
1957 const char *name
= NULL
;
1958 YYLTYPE loc
= this->get_location();
1960 type
= this->type
->specifier
->glsl_type(& name
, state
);
1964 _mesa_glsl_error(& loc
, state
,
1965 "invalid type `%s' in declaration of `%s'",
1966 name
, this->identifier
);
1968 _mesa_glsl_error(& loc
, state
,
1969 "invalid type in declaration of `%s'",
1973 type
= glsl_type::error_type
;
1976 /* From page 62 (page 68 of the PDF) of the GLSL 1.50 spec:
1978 * "Functions that accept no input arguments need not use void in the
1979 * argument list because prototypes (or definitions) are required and
1980 * therefore there is no ambiguity when an empty argument list "( )" is
1981 * declared. The idiom "(void)" as a parameter list is provided for
1984 * Placing this check here prevents a void parameter being set up
1985 * for a function, which avoids tripping up checks for main taking
1986 * parameters and lookups of an unnamed symbol.
1988 if (type
->is_void()) {
1989 if (this->identifier
!= NULL
)
1990 _mesa_glsl_error(& loc
, state
,
1991 "named parameter cannot have type `void'");
1997 if (formal_parameter
&& (this->identifier
== NULL
)) {
1998 _mesa_glsl_error(& loc
, state
, "formal parameter lacks a name");
2003 ir_variable
*var
= new(ctx
) ir_variable(type
, this->identifier
);
2005 /* FINISHME: Handle array declarations. Note that this requires
2006 * FINISHME: complete handling of constant expressions.
2009 /* Apply any specified qualifiers to the parameter declaration. Note that
2010 * for function parameters the default mode is 'in'.
2012 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
, & loc
);
2013 if (var
->mode
== ir_var_auto
)
2014 var
->mode
= ir_var_in
;
2016 instructions
->push_tail(var
);
2018 /* Parameter declarations do not have r-values.
2025 ast_parameter_declarator::parameters_to_hir(exec_list
*ast_parameters
,
2027 exec_list
*ir_parameters
,
2028 _mesa_glsl_parse_state
*state
)
2030 ast_parameter_declarator
*void_param
= NULL
;
2033 foreach_list_typed (ast_parameter_declarator
, param
, link
, ast_parameters
) {
2034 param
->formal_parameter
= formal
;
2035 param
->hir(ir_parameters
, state
);
2043 if ((void_param
!= NULL
) && (count
> 1)) {
2044 YYLTYPE loc
= void_param
->get_location();
2046 _mesa_glsl_error(& loc
, state
,
2047 "`void' parameter must be only parameter");
2053 ast_function::hir(exec_list
*instructions
,
2054 struct _mesa_glsl_parse_state
*state
)
2057 ir_function
*f
= NULL
;
2058 ir_function_signature
*sig
= NULL
;
2059 exec_list hir_parameters
;
2061 const char *const name
= identifier
;
2063 /* Convert the list of function parameters to HIR now so that they can be
2064 * used below to compare this function's signature with previously seen
2065 * signatures for functions with the same name.
2067 ast_parameter_declarator::parameters_to_hir(& this->parameters
,
2069 & hir_parameters
, state
);
2071 const char *return_type_name
;
2072 const glsl_type
*return_type
=
2073 this->return_type
->specifier
->glsl_type(& return_type_name
, state
);
2075 assert(return_type
!= NULL
);
2077 /* From page 56 (page 62 of the PDF) of the GLSL 1.30 spec:
2078 * "No qualifier is allowed on the return type of a function."
2080 if (this->return_type
->has_qualifiers()) {
2081 YYLTYPE loc
= this->get_location();
2082 _mesa_glsl_error(& loc
, state
,
2083 "function `%s' return type has qualifiers", name
);
2086 /* Verify that this function's signature either doesn't match a previously
2087 * seen signature for a function with the same name, or, if a match is found,
2088 * that the previously seen signature does not have an associated definition.
2090 f
= state
->symbols
->get_function(name
);
2092 ir_function_signature
*sig
= f
->exact_matching_signature(&hir_parameters
);
2094 const char *badvar
= sig
->qualifiers_match(&hir_parameters
);
2095 if (badvar
!= NULL
) {
2096 YYLTYPE loc
= this->get_location();
2098 _mesa_glsl_error(&loc
, state
, "function `%s' parameter `%s' "
2099 "qualifiers don't match prototype", name
, badvar
);
2102 if (sig
->return_type
!= return_type
) {
2103 YYLTYPE loc
= this->get_location();
2105 _mesa_glsl_error(&loc
, state
, "function `%s' return type doesn't "
2106 "match prototype", name
);
2109 if (is_definition
&& sig
->is_defined
) {
2110 YYLTYPE loc
= this->get_location();
2112 _mesa_glsl_error(& loc
, state
, "function `%s' redefined", name
);
2116 } else if (state
->symbols
->name_declared_this_scope(name
)) {
2117 /* This function name shadows a non-function use of the same name.
2119 YYLTYPE loc
= this->get_location();
2121 _mesa_glsl_error(& loc
, state
, "function name `%s' conflicts with "
2122 "non-function", name
);
2125 f
= new(ctx
) ir_function(name
);
2126 state
->symbols
->add_function(f
->name
, f
);
2128 /* Emit the new function header */
2129 instructions
->push_tail(f
);
2132 /* Verify the return type of main() */
2133 if (strcmp(name
, "main") == 0) {
2134 if (! return_type
->is_void()) {
2135 YYLTYPE loc
= this->get_location();
2137 _mesa_glsl_error(& loc
, state
, "main() must return void");
2140 if (!hir_parameters
.is_empty()) {
2141 YYLTYPE loc
= this->get_location();
2143 _mesa_glsl_error(& loc
, state
, "main() must not take any parameters");
2147 /* Finish storing the information about this new function in its signature.
2150 sig
= new(ctx
) ir_function_signature(return_type
);
2151 f
->add_signature(sig
);
2154 sig
->replace_parameters(&hir_parameters
);
2157 /* Function declarations (prototypes) do not have r-values.
2164 ast_function_definition::hir(exec_list
*instructions
,
2165 struct _mesa_glsl_parse_state
*state
)
2167 prototype
->is_definition
= true;
2168 prototype
->hir(instructions
, state
);
2170 ir_function_signature
*signature
= prototype
->signature
;
2172 assert(state
->current_function
== NULL
);
2173 state
->current_function
= signature
;
2174 state
->found_return
= false;
2176 /* Duplicate parameters declared in the prototype as concrete variables.
2177 * Add these to the symbol table.
2179 state
->symbols
->push_scope();
2180 foreach_iter(exec_list_iterator
, iter
, signature
->parameters
) {
2181 ir_variable
*const var
= ((ir_instruction
*) iter
.get())->as_variable();
2183 assert(var
!= NULL
);
2185 /* The only way a parameter would "exist" is if two parameters have
2188 if (state
->symbols
->name_declared_this_scope(var
->name
)) {
2189 YYLTYPE loc
= this->get_location();
2191 _mesa_glsl_error(& loc
, state
, "parameter `%s' redeclared", var
->name
);
2193 state
->symbols
->add_variable(var
->name
, var
);
2197 /* Convert the body of the function to HIR. */
2198 this->body
->hir(&signature
->body
, state
);
2199 signature
->is_defined
= true;
2201 state
->symbols
->pop_scope();
2203 assert(state
->current_function
== signature
);
2204 state
->current_function
= NULL
;
2206 if (!signature
->return_type
->is_void() && !state
->found_return
) {
2207 YYLTYPE loc
= this->get_location();
2208 _mesa_glsl_error(& loc
, state
, "function `%s' has non-void return type "
2209 "%s, but no return statement",
2210 signature
->function_name(),
2211 signature
->return_type
->name
);
2214 /* Function definitions do not have r-values.
2221 ast_jump_statement::hir(exec_list
*instructions
,
2222 struct _mesa_glsl_parse_state
*state
)
2229 assert(state
->current_function
);
2231 if (opt_return_value
) {
2232 if (state
->current_function
->return_type
->base_type
==
2234 YYLTYPE loc
= this->get_location();
2236 _mesa_glsl_error(& loc
, state
,
2237 "`return` with a value, in function `%s' "
2239 state
->current_function
->function_name());
2242 ir_expression
*const ret
= (ir_expression
*)
2243 opt_return_value
->hir(instructions
, state
);
2244 assert(ret
!= NULL
);
2246 /* Implicit conversions are not allowed for return values. */
2247 if (state
->current_function
->return_type
!= ret
->type
) {
2248 YYLTYPE loc
= this->get_location();
2250 _mesa_glsl_error(& loc
, state
,
2251 "`return' with wrong type %s, in function `%s' "
2254 state
->current_function
->function_name(),
2255 state
->current_function
->return_type
->name
);
2258 inst
= new(ctx
) ir_return(ret
);
2260 if (state
->current_function
->return_type
->base_type
!=
2262 YYLTYPE loc
= this->get_location();
2264 _mesa_glsl_error(& loc
, state
,
2265 "`return' with no value, in function %s returning "
2267 state
->current_function
->function_name());
2269 inst
= new(ctx
) ir_return
;
2272 state
->found_return
= true;
2273 instructions
->push_tail(inst
);
2278 if (state
->target
!= fragment_shader
) {
2279 YYLTYPE loc
= this->get_location();
2281 _mesa_glsl_error(& loc
, state
,
2282 "`discard' may only appear in a fragment shader");
2284 instructions
->push_tail(new(ctx
) ir_discard
);
2289 /* FINISHME: Handle switch-statements. They cannot contain 'continue',
2290 * FINISHME: and they use a different IR instruction for 'break'.
2292 /* FINISHME: Correctly handle the nesting. If a switch-statement is
2293 * FINISHME: inside a loop, a 'continue' is valid and will bind to the
2296 if (state
->loop_or_switch_nesting
== NULL
) {
2297 YYLTYPE loc
= this->get_location();
2299 _mesa_glsl_error(& loc
, state
,
2300 "`%s' may only appear in a loop",
2301 (mode
== ast_break
) ? "break" : "continue");
2303 ir_loop
*const loop
= state
->loop_or_switch_nesting
->as_loop();
2306 ir_loop_jump
*const jump
=
2307 new(ctx
) ir_loop_jump((mode
== ast_break
)
2308 ? ir_loop_jump::jump_break
2309 : ir_loop_jump::jump_continue
);
2310 instructions
->push_tail(jump
);
2317 /* Jump instructions do not have r-values.
2324 ast_selection_statement::hir(exec_list
*instructions
,
2325 struct _mesa_glsl_parse_state
*state
)
2329 ir_rvalue
*const condition
= this->condition
->hir(instructions
, state
);
2331 /* From page 66 (page 72 of the PDF) of the GLSL 1.50 spec:
2333 * "Any expression whose type evaluates to a Boolean can be used as the
2334 * conditional expression bool-expression. Vector types are not accepted
2335 * as the expression to if."
2337 * The checks are separated so that higher quality diagnostics can be
2338 * generated for cases where both rules are violated.
2340 if (!condition
->type
->is_boolean() || !condition
->type
->is_scalar()) {
2341 YYLTYPE loc
= this->condition
->get_location();
2343 _mesa_glsl_error(& loc
, state
, "if-statement condition must be scalar "
2347 ir_if
*const stmt
= new(ctx
) ir_if(condition
);
2349 if (then_statement
!= NULL
)
2350 then_statement
->hir(& stmt
->then_instructions
, state
);
2352 if (else_statement
!= NULL
)
2353 else_statement
->hir(& stmt
->else_instructions
, state
);
2355 instructions
->push_tail(stmt
);
2357 /* if-statements do not have r-values.
2364 ast_iteration_statement::condition_to_hir(ir_loop
*stmt
,
2365 struct _mesa_glsl_parse_state
*state
)
2369 if (condition
!= NULL
) {
2370 ir_rvalue
*const cond
=
2371 condition
->hir(& stmt
->body_instructions
, state
);
2374 || !cond
->type
->is_boolean() || !cond
->type
->is_scalar()) {
2375 YYLTYPE loc
= condition
->get_location();
2377 _mesa_glsl_error(& loc
, state
,
2378 "loop condition must be scalar boolean");
2380 /* As the first code in the loop body, generate a block that looks
2381 * like 'if (!condition) break;' as the loop termination condition.
2383 ir_rvalue
*const not_cond
=
2384 new(ctx
) ir_expression(ir_unop_logic_not
, glsl_type::bool_type
, cond
,
2387 ir_if
*const if_stmt
= new(ctx
) ir_if(not_cond
);
2389 ir_jump
*const break_stmt
=
2390 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
2392 if_stmt
->then_instructions
.push_tail(break_stmt
);
2393 stmt
->body_instructions
.push_tail(if_stmt
);
2400 ast_iteration_statement::hir(exec_list
*instructions
,
2401 struct _mesa_glsl_parse_state
*state
)
2405 /* For-loops and while-loops start a new scope, but do-while loops do not.
2407 if (mode
!= ast_do_while
)
2408 state
->symbols
->push_scope();
2410 if (init_statement
!= NULL
)
2411 init_statement
->hir(instructions
, state
);
2413 ir_loop
*const stmt
= new(ctx
) ir_loop();
2414 instructions
->push_tail(stmt
);
2416 /* Track the current loop and / or switch-statement nesting.
2418 ir_instruction
*const nesting
= state
->loop_or_switch_nesting
;
2419 state
->loop_or_switch_nesting
= stmt
;
2421 if (mode
!= ast_do_while
)
2422 condition_to_hir(stmt
, state
);
2425 body
->hir(& stmt
->body_instructions
, state
);
2427 if (rest_expression
!= NULL
)
2428 rest_expression
->hir(& stmt
->body_instructions
, state
);
2430 if (mode
== ast_do_while
)
2431 condition_to_hir(stmt
, state
);
2433 if (mode
!= ast_do_while
)
2434 state
->symbols
->pop_scope();
2436 /* Restore previous nesting before returning.
2438 state
->loop_or_switch_nesting
= nesting
;
2440 /* Loops do not have r-values.
2447 ast_type_specifier::hir(exec_list
*instructions
,
2448 struct _mesa_glsl_parse_state
*state
)
2450 if (this->structure
!= NULL
)
2451 return this->structure
->hir(instructions
, state
);
2458 ast_struct_specifier::hir(exec_list
*instructions
,
2459 struct _mesa_glsl_parse_state
*state
)
2461 unsigned decl_count
= 0;
2463 /* Make an initial pass over the list of structure fields to determine how
2464 * many there are. Each element in this list is an ast_declarator_list.
2465 * This means that we actually need to count the number of elements in the
2466 * 'declarations' list in each of the elements.
2468 foreach_list_typed (ast_declarator_list
, decl_list
, link
,
2469 &this->declarations
) {
2470 foreach_list_const (decl_ptr
, & decl_list
->declarations
) {
2476 /* Allocate storage for the structure fields and process the field
2477 * declarations. As the declarations are processed, try to also convert
2478 * the types to HIR. This ensures that structure definitions embedded in
2479 * other structure definitions are processed.
2481 glsl_struct_field
*const fields
= (glsl_struct_field
*)
2482 malloc(sizeof(*fields
) * decl_count
);
2485 foreach_list_typed (ast_declarator_list
, decl_list
, link
,
2486 &this->declarations
) {
2487 const char *type_name
;
2489 decl_list
->type
->specifier
->hir(instructions
, state
);
2491 const glsl_type
*decl_type
=
2492 decl_list
->type
->specifier
->glsl_type(& type_name
, state
);
2494 foreach_list_typed (ast_declaration
, decl
, link
,
2495 &decl_list
->declarations
) {
2496 const struct glsl_type
*const field_type
=
2498 ? process_array_type(decl_type
, decl
->array_size
, state
)
2501 fields
[i
].type
= (field_type
!= NULL
)
2502 ? field_type
: glsl_type::error_type
;
2503 fields
[i
].name
= decl
->identifier
;
2508 assert(i
== decl_count
);
2511 if (this->name
== NULL
) {
2512 static unsigned anon_count
= 1;
2515 snprintf(buf
, sizeof(buf
), "#anon_struct_%04x", anon_count
);
2523 const glsl_type
*t
=
2524 glsl_type::get_record_instance(fields
, decl_count
, name
);
2526 YYLTYPE loc
= this->get_location();
2527 if (!state
->symbols
->add_type(name
, t
)) {
2528 _mesa_glsl_error(& loc
, state
, "struct `%s' previously defined", name
);
2530 /* This logic is a bit tricky. It is an error to declare a structure at
2531 * global scope if there is also a function with the same name.
2533 if ((state
->current_function
== NULL
)
2534 && (state
->symbols
->get_function(name
) != NULL
)) {
2535 _mesa_glsl_error(& loc
, state
, "name `%s' previously defined", name
);
2537 t
->generate_constructor(state
->symbols
);
2540 const glsl_type
**s
= (const glsl_type
**)
2541 realloc(state
->user_structures
,
2542 sizeof(state
->user_structures
[0]) *
2543 (state
->num_user_structures
+ 1));
2545 s
[state
->num_user_structures
] = t
;
2546 state
->user_structures
= s
;
2547 state
->num_user_structures
++;
2551 /* Structure type definitions do not have r-values.