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 struct simple_node
*ptr
;
64 _mesa_glsl_initialize_variables(instructions
, state
);
65 _mesa_glsl_initialize_constructors(instructions
, state
);
67 state
->current_function
= NULL
;
69 foreach (ptr
, & state
->translation_unit
) {
70 ((ast_node
*)ptr
)->hir(instructions
, state
);
75 static const struct glsl_type
*
76 arithmetic_result_type(const struct glsl_type
*type_a
,
77 const struct glsl_type
*type_b
,
79 struct _mesa_glsl_parse_state
*state
)
81 /* From GLSL 1.50 spec, page 56:
83 * "The arithmetic binary operators add (+), subtract (-),
84 * multiply (*), and divide (/) operate on integer and
85 * floating-point scalars, vectors, and matrices."
87 if (!type_a
->is_numeric() || !type_b
->is_numeric()) {
88 return glsl_error_type
;
92 /* "If one operand is floating-point based and the other is
93 * not, then the conversions from Section 4.1.10 "Implicit
94 * Conversions" are applied to the non-floating-point-based operand."
96 * This conversion was added in GLSL 1.20. If the compilation mode is
97 * GLSL 1.10, the conversion is skipped.
99 if (state
->language_version
>= 120) {
100 if ((type_a
->base_type
== GLSL_TYPE_FLOAT
)
101 && (type_b
->base_type
!= GLSL_TYPE_FLOAT
)) {
102 } else if ((type_a
->base_type
!= GLSL_TYPE_FLOAT
)
103 && (type_b
->base_type
== GLSL_TYPE_FLOAT
)) {
107 /* "If the operands are integer types, they must both be signed or
110 * From this rule and the preceeding conversion it can be inferred that
111 * both types must be GLSL_TYPE_FLOAT, or GLSL_TYPE_UINT, or GLSL_TYPE_INT.
112 * The is_numeric check above already filtered out the case where either
113 * type is not one of these, so now the base types need only be tested for
116 if (type_a
->base_type
!= type_b
->base_type
) {
117 return glsl_error_type
;
120 /* "All arithmetic binary operators result in the same fundamental type
121 * (signed integer, unsigned integer, or floating-point) as the
122 * operands they operate on, after operand type conversion. After
123 * conversion, the following cases are valid
125 * * The two operands are scalars. In this case the operation is
126 * applied, resulting in a scalar."
128 if (type_a
->is_scalar() && type_b
->is_scalar())
131 /* "* One operand is a scalar, and the other is a vector or matrix.
132 * In this case, the scalar operation is applied independently to each
133 * component of the vector or matrix, resulting in the same size
136 if (type_a
->is_scalar()) {
137 if (!type_b
->is_scalar())
139 } else if (type_b
->is_scalar()) {
143 /* All of the combinations of <scalar, scalar>, <vector, scalar>,
144 * <scalar, vector>, <scalar, matrix>, and <matrix, scalar> have been
147 assert(!type_a
->is_scalar());
148 assert(!type_b
->is_scalar());
150 /* "* The two operands are vectors of the same size. In this case, the
151 * operation is done component-wise resulting in the same size
154 if (type_a
->is_vector() && type_b
->is_vector()) {
155 return (type_a
== type_b
) ? type_a
: glsl_error_type
;
158 /* All of the combinations of <scalar, scalar>, <vector, scalar>,
159 * <scalar, vector>, <scalar, matrix>, <matrix, scalar>, and
160 * <vector, vector> have been handled. At least one of the operands must
161 * be matrix. Further, since there are no integer matrix types, the base
162 * type of both operands must be float.
164 assert(type_a
->is_matrix() || type_b
->is_matrix());
165 assert(type_a
->base_type
== GLSL_TYPE_FLOAT
);
166 assert(type_b
->base_type
== GLSL_TYPE_FLOAT
);
168 /* "* The operator is add (+), subtract (-), or divide (/), and the
169 * operands are matrices with the same number of rows and the same
170 * number of columns. In this case, the operation is done component-
171 * wise resulting in the same size matrix."
172 * * The operator is multiply (*), where both operands are matrices or
173 * one operand is a vector and the other a matrix. A right vector
174 * operand is treated as a column vector and a left vector operand as a
175 * row vector. In all these cases, it is required that the number of
176 * columns of the left operand is equal to the number of rows of the
177 * right operand. Then, the multiply (*) operation does a linear
178 * algebraic multiply, yielding an object that has the same number of
179 * rows as the left operand and the same number of columns as the right
180 * operand. Section 5.10 "Vector and Matrix Operations" explains in
181 * more detail how vectors and matrices are operated on."
184 return (type_a
== type_b
) ? type_a
: glsl_error_type
;
186 if (type_a
->is_matrix() && type_b
->is_matrix()) {
187 /* Matrix multiply. The columns of A must match the rows of B. Given
188 * the other previously tested constraints, this means the vector type
189 * of a row from A must be the same as the vector type of a column from
192 if (type_a
->row_type() == type_b
->column_type()) {
193 /* The resulting matrix has the number of columns of matrix B and
194 * the number of rows of matrix A. We get the row count of A by
195 * looking at the size of a vector that makes up a column. The
196 * transpose (size of a row) is done for B.
199 glsl_type::get_instance(type_a
->base_type
,
200 type_a
->column_type()->vector_elements
,
201 type_b
->row_type()->vector_elements
);
203 } else if (type_a
->is_matrix()) {
204 /* A is a matrix and B is a column vector. Columns of A must match
205 * rows of B. Given the other previously tested constraints, this
206 * means the vector type of a row from A must be the same as the
207 * vector the type of B.
209 if (type_a
->row_type() == type_b
)
212 assert(type_b
->is_matrix());
214 /* A is a row vector and B is a matrix. Columns of A must match rows
215 * of B. Given the other previously tested constraints, this means
216 * the type of A must be the same as the vector type of a column from
219 if (type_a
== type_b
->column_type())
225 /* "All other cases are illegal."
227 return glsl_error_type
;
231 static const struct glsl_type
*
232 unary_arithmetic_result_type(const struct glsl_type
*type
)
234 /* From GLSL 1.50 spec, page 57:
236 * "The arithmetic unary operators negate (-), post- and pre-increment
237 * and decrement (-- and ++) operate on integer or floating-point
238 * values (including vectors and matrices). All unary operators work
239 * component-wise on their operands. These result with the same type
242 if (!is_numeric_base_type(type
->base_type
))
243 return glsl_error_type
;
249 static const struct glsl_type
*
250 modulus_result_type(const struct glsl_type
*type_a
,
251 const struct glsl_type
*type_b
)
253 /* From GLSL 1.50 spec, page 56:
254 * "The operator modulus (%) operates on signed or unsigned integers or
255 * integer vectors. The operand types must both be signed or both be
258 if (! is_integer_base_type(type_a
->base_type
)
259 || ! is_integer_base_type(type_b
->base_type
)
260 || (type_a
->base_type
!= type_b
->base_type
)) {
261 return glsl_error_type
;
264 /* "The operands cannot be vectors of differing size. If one operand is
265 * a scalar and the other vector, then the scalar is applied component-
266 * wise to the vector, resulting in the same type as the vector. If both
267 * are vectors of the same size, the result is computed component-wise."
269 if (type_a
->is_vector()) {
270 if (!type_b
->is_vector()
271 || (type_a
->vector_elements
== type_b
->vector_elements
))
276 /* "The operator modulus (%) is not defined for any other data types
277 * (non-integer types)."
279 return glsl_error_type
;
283 static const struct glsl_type
*
284 relational_result_type(const struct glsl_type
*type_a
,
285 const struct glsl_type
*type_b
,
286 struct _mesa_glsl_parse_state
*state
)
288 /* From GLSL 1.50 spec, page 56:
289 * "The relational operators greater than (>), less than (<), greater
290 * than or equal (>=), and less than or equal (<=) operate only on
291 * scalar integer and scalar floating-point expressions."
293 if (! is_numeric_base_type(type_a
->base_type
)
294 || ! is_numeric_base_type(type_b
->base_type
)
295 || !type_a
->is_scalar()
296 || !type_b
->is_scalar())
297 return glsl_error_type
;
299 /* "Either the operands' types must match, or the conversions from
300 * Section 4.1.10 "Implicit Conversions" will be applied to the integer
301 * operand, after which the types must match."
303 * This conversion was added in GLSL 1.20. If the compilation mode is
304 * GLSL 1.10, the conversion is skipped.
306 if (state
->language_version
>= 120) {
307 if ((type_a
->base_type
== GLSL_TYPE_FLOAT
)
308 && (type_b
->base_type
!= GLSL_TYPE_FLOAT
)) {
309 /* FINISHME: Generate the implicit type conversion. */
310 } else if ((type_a
->base_type
!= GLSL_TYPE_FLOAT
)
311 && (type_b
->base_type
== GLSL_TYPE_FLOAT
)) {
312 /* FINISHME: Generate the implicit type conversion. */
316 if (type_a
->base_type
!= type_b
->base_type
)
317 return glsl_error_type
;
319 /* "The result is scalar Boolean."
321 return glsl_bool_type
;
326 * Validates that a value can be assigned to a location with a specified type
328 * Validates that \c rhs can be assigned to some location. If the types are
329 * not an exact match but an automatic conversion is possible, \c rhs will be
333 * \c NULL if \c rhs cannot be assigned to a location with type \c lhs_type.
334 * Otherwise the actual RHS to be assigned will be returned. This may be
335 * \c rhs, or it may be \c rhs after some type conversion.
338 * In addition to being used for assignments, this function is used to
339 * type-check return values.
342 validate_assignment(const glsl_type
*lhs_type
, ir_instruction
*rhs
)
344 const glsl_type
*const rhs_type
= rhs
->type
;
346 /* If there is already some error in the RHS, just return it. Anything
347 * else will lead to an avalanche of error message back to the user.
349 if (rhs_type
->is_error())
352 /* FINISHME: For GLSL 1.10, check that the types are not arrays. */
354 /* If the types are identical, the assignment can trivially proceed.
356 if (rhs_type
== lhs_type
)
359 /* FINISHME: Check for and apply automatic conversions. */
365 ast_node::hir(exec_list
*instructions
,
366 struct _mesa_glsl_parse_state
*state
)
376 ast_expression::hir(exec_list
*instructions
,
377 struct _mesa_glsl_parse_state
*state
)
379 static const int operations
[AST_NUM_OPERATORS
] = {
380 -1, /* ast_assign doesn't convert to ir_expression. */
381 -1, /* ast_plus doesn't convert to ir_expression. */
405 /* Note: The following block of expression types actually convert
406 * to multiple IR instructions.
408 ir_binop_mul
, /* ast_mul_assign */
409 ir_binop_div
, /* ast_div_assign */
410 ir_binop_mod
, /* ast_mod_assign */
411 ir_binop_add
, /* ast_add_assign */
412 ir_binop_sub
, /* ast_sub_assign */
413 ir_binop_lshift
, /* ast_ls_assign */
414 ir_binop_rshift
, /* ast_rs_assign */
415 ir_binop_bit_and
, /* ast_and_assign */
416 ir_binop_bit_xor
, /* ast_xor_assign */
417 ir_binop_bit_or
, /* ast_or_assign */
419 -1, /* ast_conditional doesn't convert to ir_expression. */
420 -1, /* ast_pre_inc doesn't convert to ir_expression. */
421 -1, /* ast_pre_dec doesn't convert to ir_expression. */
422 -1, /* ast_post_inc doesn't convert to ir_expression. */
423 -1, /* ast_post_dec doesn't convert to ir_expression. */
424 -1, /* ast_field_selection doesn't conv to ir_expression. */
425 -1, /* ast_array_index doesn't convert to ir_expression. */
426 -1, /* ast_function_call doesn't conv to ir_expression. */
427 -1, /* ast_identifier doesn't convert to ir_expression. */
428 -1, /* ast_int_constant doesn't convert to ir_expression. */
429 -1, /* ast_uint_constant doesn't conv to ir_expression. */
430 -1, /* ast_float_constant doesn't conv to ir_expression. */
431 -1, /* ast_bool_constant doesn't conv to ir_expression. */
432 -1, /* ast_sequence doesn't convert to ir_expression. */
434 ir_instruction
*result
= NULL
;
435 ir_instruction
*op
[2];
436 struct simple_node op_list
;
437 const struct glsl_type
*type
= glsl_error_type
;
438 bool error_emitted
= false;
441 loc
= this->get_location();
442 make_empty_list(& op_list
);
444 switch (this->oper
) {
446 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
447 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
449 error_emitted
= ((op
[0]->type
== glsl_error_type
)
450 || (op
[1]->type
== glsl_error_type
));
453 if (!error_emitted
) {
456 /* FINISHME: This does not handle 'foo.bar.a.b.c[5].d = 5' */
457 loc
= this->subexpressions
[0]->get_location();
458 if (op
[0]->mode
!= ir_op_dereference
) {
459 _mesa_glsl_error(& loc
, state
, "invalid lvalue in assignment");
460 error_emitted
= true;
462 type
= glsl_error_type
;
464 const struct ir_dereference
*const ref
=
465 (struct ir_dereference
*) op
[0];
466 const struct ir_variable
*const var
=
467 (struct ir_variable
*) ref
->var
;
470 && (var
->mode
== ir_op_var_decl
)
471 && (var
->read_only
)) {
472 _mesa_glsl_error(& loc
, state
, "cannot assign to read-only "
473 "variable `%s'", var
->name
);
474 error_emitted
= true;
476 type
= glsl_error_type
;
481 ir_instruction
*rhs
= validate_assignment(op
[0]->type
, op
[1]);
483 type
= glsl_error_type
;
487 ir_instruction
*tmp
= new ir_assignment(op
[0], op
[1], NULL
);
488 instructions
->push_tail(tmp
);
495 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
497 error_emitted
= (op
[0]->type
== glsl_error_type
);
498 if (type
== glsl_error_type
)
505 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
507 type
= unary_arithmetic_result_type(op
[0]->type
);
509 error_emitted
= (op
[0]->type
== glsl_error_type
);
511 result
= new ir_expression(operations
[this->oper
], type
,
519 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
520 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
522 type
= arithmetic_result_type(op
[0]->type
, op
[1]->type
,
523 (this->oper
== ast_mul
),
526 result
= new ir_expression(operations
[this->oper
], type
,
531 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
532 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
534 error_emitted
= ((op
[0]->type
== glsl_error_type
)
535 || (op
[1]->type
== glsl_error_type
));
537 type
= modulus_result_type(op
[0]->type
, op
[1]->type
);
539 assert(operations
[this->oper
] == ir_binop_mod
);
541 result
= new ir_expression(operations
[this->oper
], type
,
547 /* FINISHME: Implement bit-shift operators. */
554 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
555 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
557 error_emitted
= ((op
[0]->type
== glsl_error_type
)
558 || (op
[1]->type
== glsl_error_type
));
560 type
= relational_result_type(op
[0]->type
, op
[1]->type
, state
);
562 /* The relational operators must either generate an error or result
563 * in a scalar boolean. See page 57 of the GLSL 1.50 spec.
565 assert((type
== glsl_error_type
)
566 || ((type
->base_type
== GLSL_TYPE_BOOL
)
567 && type
->is_scalar()));
569 result
= new ir_expression(operations
[this->oper
], type
,
575 /* FINISHME: Implement equality operators. */
582 /* FINISHME: Implement bit-wise operators. */
589 /* FINISHME: Implement logical operators. */
595 case ast_sub_assign
: {
596 struct ir_instruction
*temp_rhs
;
598 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
599 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
601 error_emitted
= ((op
[0]->type
== glsl_error_type
)
602 || (op
[1]->type
== glsl_error_type
));
604 type
= arithmetic_result_type(op
[0]->type
, op
[1]->type
,
605 (this->oper
== ast_mul_assign
),
608 temp_rhs
= new ir_expression(operations
[this->oper
], type
,
611 /* FINISHME: This is copied from ast_assign above. It should
612 * FINISHME: probably be consolidated.
614 error_emitted
= ((op
[0]->type
== glsl_error_type
)
615 || (temp_rhs
->type
== glsl_error_type
));
618 if (!error_emitted
) {
621 /* FINISHME: This does not handle 'foo.bar.a.b.c[5].d = 5' */
622 loc
= this->subexpressions
[0]->get_location();
623 if (op
[0]->mode
!= ir_op_dereference
) {
624 _mesa_glsl_error(& loc
, state
, "invalid lvalue in assignment");
625 error_emitted
= true;
627 type
= glsl_error_type
;
629 const struct ir_dereference
*const ref
=
630 (struct ir_dereference
*) op
[0];
631 const struct ir_variable
*const var
=
632 (struct ir_variable
*) ref
->var
;
635 && (var
->mode
== ir_op_var_decl
)
636 && (var
->read_only
)) {
637 _mesa_glsl_error(& loc
, state
, "cannot assign to read-only "
638 "variable `%s'", var
->name
);
639 error_emitted
= true;
641 type
= glsl_error_type
;
646 ir_instruction
*rhs
= validate_assignment(op
[0]->type
, temp_rhs
);
648 type
= glsl_error_type
;
652 ir_instruction
*tmp
= new ir_assignment(op
[0], rhs
, NULL
);
653 instructions
->push_tail(tmp
);
655 /* GLSL 1.10 does not allow array assignment. However, we don't have to
656 * explicitly test for this because none of the binary expression
657 * operators allow array operands either.
673 case ast_conditional
:
682 case ast_field_selection
:
683 result
= _mesa_ast_field_selection_to_hir(this, instructions
, state
);
687 case ast_array_index
:
690 case ast_function_call
:
691 /* Should *NEVER* get here. ast_function_call should always be handled
692 * by ast_function_expression::hir.
697 case ast_identifier
: {
698 /* ast_identifier can appear several places in a full abstract syntax
699 * tree. This particular use must be at location specified in the grammar
700 * as 'variable_identifier'.
703 state
->symbols
->get_variable(this->primary_expression
.identifier
);
705 result
= new ir_dereference(var
);
710 _mesa_glsl_error(& loc
, state
, "`%s' undeclared",
711 this->primary_expression
.identifier
);
713 error_emitted
= true;
718 case ast_int_constant
:
719 type
= glsl_int_type
;
720 result
= new ir_constant(type
, & this->primary_expression
);
723 case ast_uint_constant
:
724 type
= glsl_uint_type
;
725 result
= new ir_constant(type
, & this->primary_expression
);
728 case ast_float_constant
:
729 type
= glsl_float_type
;
730 result
= new ir_constant(type
, & this->primary_expression
);
733 case ast_bool_constant
:
734 type
= glsl_bool_type
;
735 result
= new ir_constant(type
, & this->primary_expression
);
739 struct simple_node
*ptr
;
741 /* It should not be possible to generate a sequence in the AST without
742 * any expressions in it.
744 assert(!is_empty_list(&this->expressions
));
746 /* The r-value of a sequence is the last expression in the sequence. If
747 * the other expressions in the sequence do not have side-effects (and
748 * therefore add instructions to the instruction list), they get dropped
751 foreach (ptr
, &this->expressions
)
752 result
= ((ast_node
*)ptr
)->hir(instructions
, state
);
756 /* Any errors should have already been emitted in the loop above.
758 error_emitted
= true;
763 if (is_error_type(type
) && !error_emitted
)
764 _mesa_glsl_error(& loc
, state
, "type mismatch");
771 ast_expression_statement::hir(exec_list
*instructions
,
772 struct _mesa_glsl_parse_state
*state
)
774 /* It is possible to have expression statements that don't have an
775 * expression. This is the solitary semicolon:
777 * for (i = 0; i < 5; i++)
780 * In this case the expression will be NULL. Test for NULL and don't do
781 * anything in that case.
783 if (expression
!= NULL
)
784 expression
->hir(instructions
, state
);
786 /* Statements do not have r-values.
793 ast_compound_statement::hir(exec_list
*instructions
,
794 struct _mesa_glsl_parse_state
*state
)
796 struct simple_node
*ptr
;
800 state
->symbols
->push_scope();
802 foreach (ptr
, &statements
)
803 ((ast_node
*)ptr
)->hir(instructions
, state
);
806 state
->symbols
->pop_scope();
808 /* Compound statements do not have r-values.
814 static const struct glsl_type
*
815 type_specifier_to_glsl_type(const struct ast_type_specifier
*spec
,
817 struct _mesa_glsl_parse_state
*state
)
819 struct glsl_type
*type
;
821 if (spec
->type_specifier
== ast_struct
) {
822 /* FINISHME: Handle annonymous structures. */
825 type
= state
->symbols
->get_type(spec
->type_name
);
826 *name
= spec
->type_name
;
828 /* FINISHME: Handle array declarations. Note that this requires complete
829 * FINISHME: handling of constant expressions.
838 apply_type_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
839 struct ir_variable
*var
,
840 struct _mesa_glsl_parse_state
*state
)
845 /* FINISHME: Mark 'in' variables at global scope as read-only. */
846 if (qual
->constant
|| qual
->attribute
|| qual
->uniform
847 || (qual
->varying
&& (state
->target
== fragment_shader
)))
853 if (qual
->in
&& qual
->out
)
854 var
->mode
= ir_var_inout
;
855 else if (qual
->attribute
|| qual
->in
856 || (qual
->varying
&& (state
->target
== fragment_shader
)))
857 var
->mode
= ir_var_in
;
858 else if (qual
->out
|| (qual
->varying
&& (state
->target
== vertex_shader
)))
859 var
->mode
= ir_var_out
;
860 else if (qual
->uniform
)
861 var
->mode
= ir_var_uniform
;
863 var
->mode
= ir_var_auto
;
866 var
->interpolation
= ir_var_flat
;
867 else if (qual
->noperspective
)
868 var
->interpolation
= ir_var_noperspective
;
870 var
->interpolation
= ir_var_smooth
;
875 ast_declarator_list::hir(exec_list
*instructions
,
876 struct _mesa_glsl_parse_state
*state
)
878 struct simple_node
*ptr
;
879 const struct glsl_type
*decl_type
;
880 const char *type_name
= NULL
;
883 /* FINISHME: Handle vertex shader "invariant" declarations that do not
884 * FINISHME: include a type. These re-declare built-in variables to be
885 * FINISHME: invariant.
888 decl_type
= type_specifier_to_glsl_type(this->type
->specifier
,
891 foreach (ptr
, &this->declarations
) {
892 struct ast_declaration
*const decl
= (struct ast_declaration
* )ptr
;
893 const struct glsl_type
*var_type
;
894 struct ir_variable
*var
;
897 /* FINISHME: Emit a warning if a variable declaration shadows a
898 * FINISHME: declaration at a higher scope.
901 if ((decl_type
== NULL
) || decl_type
->is_void()) {
904 loc
= this->get_location();
905 if (type_name
!= NULL
) {
906 _mesa_glsl_error(& loc
, state
,
907 "invalid type `%s' in declaration of `%s'",
908 type_name
, decl
->identifier
);
910 _mesa_glsl_error(& loc
, state
,
911 "invalid type in declaration of `%s'",
917 if (decl
->is_array
) {
918 /* FINISHME: Handle array declarations. Note that this requires
919 * FINISHME: complete handling of constant expressions.
922 /* FINISHME: Reject delcarations of multidimensional arrays. */
924 var_type
= decl_type
;
927 var
= new ir_variable(var_type
, decl
->identifier
);
929 /* FINISHME: Variables that are attribute, uniform, varying, in, or
930 * FINISHME: out varibles must be declared either at global scope or
931 * FINISHME: in a parameter list (in and out only).
934 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
);
936 /* Attempt to add the variable to the symbol table. If this fails, it
937 * means the variable has already been declared at this scope.
939 if (state
->symbols
->name_declared_this_scope(decl
->identifier
)) {
940 YYLTYPE loc
= this->get_location();
942 _mesa_glsl_error(& loc
, state
, "`%s' redeclared",
947 const bool added_variable
=
948 state
->symbols
->add_variable(decl
->identifier
, var
);
949 assert(added_variable
);
951 instructions
->push_tail(var
);
953 /* FINISHME: Process the declaration initializer. */
956 /* Variable declarations do not have r-values.
963 ast_parameter_declarator::hir(exec_list
*instructions
,
964 struct _mesa_glsl_parse_state
*state
)
966 const struct glsl_type
*type
;
967 const char *name
= NULL
;
970 type
= type_specifier_to_glsl_type(this->type
->specifier
, & name
, state
);
973 YYLTYPE loc
= this->get_location();
975 _mesa_glsl_error(& loc
, state
,
976 "invalid type `%s' in declaration of `%s'",
977 name
, this->identifier
);
979 _mesa_glsl_error(& loc
, state
,
980 "invalid type in declaration of `%s'",
984 type
= glsl_error_type
;
987 ir_variable
*var
= new ir_variable(type
, this->identifier
);
989 /* FINISHME: Handle array declarations. Note that this requires
990 * FINISHME: complete handling of constant expressions.
993 /* Apply any specified qualifiers to the parameter declaration. Note that
994 * for function parameters the default mode is 'in'.
996 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
);
997 if (var
->mode
== ir_var_auto
)
998 var
->mode
= ir_var_in
;
1000 instructions
->push_tail(var
);
1002 /* Parameter declarations do not have r-values.
1009 ast_function_parameters_to_hir(struct simple_node
*ast_parameters
,
1010 exec_list
*ir_parameters
,
1011 struct _mesa_glsl_parse_state
*state
)
1013 struct simple_node
*ptr
;
1015 foreach (ptr
, ast_parameters
) {
1016 ((ast_node
*)ptr
)->hir(ir_parameters
, state
);
1022 parameter_lists_match(exec_list
*list_a
, exec_list
*list_b
)
1024 exec_list_iterator iter_a
= list_a
->iterator();
1025 exec_list_iterator iter_b
= list_b
->iterator();
1027 while (iter_a
.has_next()) {
1028 /* If all of the parameters from the other parameter list have been
1029 * exhausted, the lists have different length and, by definition,
1032 if (!iter_b
.has_next())
1035 /* If the types of the parameters do not match, the parameters lists
1050 ast_function_definition::hir(exec_list
*instructions
,
1051 struct _mesa_glsl_parse_state
*state
)
1054 ir_function_signature
*signature
= NULL
;
1055 ir_function
*f
= NULL
;
1056 exec_list parameters
;
1059 /* Convert the list of function parameters to HIR now so that they can be
1060 * used below to compare this function's signature with previously seen
1061 * signatures for functions with the same name.
1063 ast_function_parameters_to_hir(& this->prototype
->parameters
, & parameters
,
1066 const char *return_type_name
;
1067 const glsl_type
*return_type
=
1068 type_specifier_to_glsl_type(this->prototype
->return_type
->specifier
,
1069 & return_type_name
, state
);
1071 assert(return_type
!= NULL
);
1074 /* Verify that this function's signature either doesn't match a previously
1075 * seen signature for a function with the same name, or, if a match is found,
1076 * that the previously seen signature does not have an associated definition.
1078 const char *const name
= this->prototype
->identifier
;
1079 f
= state
->symbols
->get_function(name
);
1081 foreach_iter(exec_list_iterator
, iter
, f
->signatures
) {
1082 signature
= (struct ir_function_signature
*) iter
.get();
1084 /* Compare the parameter list of the function being defined to the
1085 * existing function. If the parameter lists match, then the return
1086 * type must also match and the existing function must not have a
1089 if (parameter_lists_match(& parameters
, & signature
->parameters
)) {
1090 /* FINISHME: Compare return types. */
1092 if (signature
->definition
!= NULL
) {
1093 YYLTYPE loc
= this->get_location();
1095 _mesa_glsl_error(& loc
, state
, "function `%s' redefined", name
);
1104 } else if (state
->symbols
->name_declared_this_scope(name
)) {
1105 /* This function name shadows a non-function use of the same name.
1107 YYLTYPE loc
= this->get_location();
1109 _mesa_glsl_error(& loc
, state
, "function name `%s' conflicts with "
1110 "non-function", name
);
1113 f
= new ir_function(name
);
1114 state
->symbols
->add_function(f
->name
, f
);
1118 /* Finish storing the information about this new function in its signature.
1120 if (signature
== NULL
) {
1121 signature
= new ir_function_signature(return_type
);
1122 f
->signatures
.push_tail(signature
);
1124 /* Destroy all of the previous parameter information. The previous
1125 * parameter information comes from the function prototype, and it can
1126 * either include invalid parameter names or may not have names at all.
1128 foreach_iter(exec_list_iterator
, iter
, signature
->parameters
) {
1129 assert(((struct ir_instruction
*)iter
.get())->mode
== ir_op_var_decl
);
1137 assert(state
->current_function
== NULL
);
1138 state
->current_function
= signature
;
1140 ast_function_parameters_to_hir(& this->prototype
->parameters
,
1141 & signature
->parameters
,
1143 /* FINISHME: Set signature->return_type */
1145 label
= new ir_label(name
);
1146 if (signature
->definition
== NULL
) {
1147 signature
->definition
= label
;
1149 instructions
->push_tail(label
);
1151 /* Add the function parameters to the symbol table. During this step the
1152 * parameter declarations are also moved from the temporary "parameters" list
1153 * to the instruction list. There are other more efficient ways to do this,
1154 * but they involve ugly linked-list gymnastics.
1156 state
->symbols
->push_scope();
1157 foreach_iter(exec_list_iterator
, iter
, parameters
) {
1158 ir_variable
*const var
= (ir_variable
*) iter
.get();
1160 assert(((ir_instruction
*)var
)->mode
== ir_op_var_decl
);
1163 instructions
->push_tail(var
);
1165 /* The only way a parameter would "exist" is if two parameters have
1168 if (state
->symbols
->name_declared_this_scope(var
->name
)) {
1169 YYLTYPE loc
= this->get_location();
1171 _mesa_glsl_error(& loc
, state
, "parameter `%s' redeclared", var
->name
);
1173 state
->symbols
->add_variable(var
->name
, var
);
1177 /* Convert the body of the function to HIR, and append the resulting
1178 * instructions to the list that currently consists of the function label
1179 * and the function parameters.
1181 this->body
->hir(instructions
, state
);
1183 state
->symbols
->pop_scope();
1185 assert(state
->current_function
== signature
);
1186 state
->current_function
= NULL
;
1188 /* Function definitions do not have r-values.
1195 ast_jump_statement::hir(exec_list
*instructions
,
1196 struct _mesa_glsl_parse_state
*state
)
1199 if (mode
== ast_return
) {
1202 if (opt_return_value
) {
1203 /* FINISHME: Make sure the enclosing function has a non-void return
1207 ir_expression
*const ret
= (ir_expression
*)
1208 opt_return_value
->hir(instructions
, state
);
1209 assert(ret
!= NULL
);
1211 /* FINISHME: Make sure the type of the return value matches the return
1212 * FINISHME: type of the enclosing function.
1215 inst
= new ir_return(ret
);
1217 /* FINISHME: Make sure the enclosing function has a void return type.
1219 inst
= new ir_return
;
1222 instructions
->push_tail(inst
);
1225 /* Jump instructions do not have r-values.