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
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11 * The above copyright notice and this permission notice (including the next
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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
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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/core.h" /* for struct gl_extensions */
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(state);
65 state->symbols->language_version = state->language_version;
67 state->current_function = NULL;
69 /* Section 4.2 of the GLSL 1.20 specification states:
70 * "The built-in functions are scoped in a scope outside the global scope
71 * users declare global variables in. That is, a shader's global scope,
72 * available for user-defined functions and global variables, is nested
73 * inside the scope containing the built-in functions."
75 * Since built-in functions like ftransform() access built-in variables,
76 * it follows that those must be in the outer scope as well.
78 * We push scope here to create this nesting effect...but don't pop.
79 * This way, a shader's globals are still in the symbol table for use
82 state->symbols->push_scope();
84 foreach_list_typed (ast_node, ast, link, & state->translation_unit)
85 ast->hir(instructions, state);
90 * If a conversion is available, convert one operand to a different type
92 * The \c from \c ir_rvalue is converted "in place".
94 * \param to Type that the operand it to be converted to
95 * \param from Operand that is being converted
96 * \param state GLSL compiler state
99 * If a conversion is possible (or unnecessary), \c true is returned.
100 * Otherwise \c false is returned.
103 apply_implicit_conversion(const glsl_type *to, ir_rvalue * &from,
104 struct _mesa_glsl_parse_state *state)
107 if (to->base_type == from->type->base_type)
110 /* This conversion was added in GLSL 1.20. If the compilation mode is
111 * GLSL 1.10, the conversion is skipped.
113 if (state->language_version < 120)
116 /* From page 27 (page 33 of the PDF) of the GLSL 1.50 spec:
118 * "There are no implicit array or structure conversions. For
119 * example, an array of int cannot be implicitly converted to an
120 * array of float. There are no implicit conversions between
121 * signed and unsigned integers."
123 /* FINISHME: The above comment is partially a lie. There is int/uint
124 * FINISHME: conversion for immediate constants.
126 if (!to->is_float() || !from->type->is_numeric())
129 /* Convert to a floating point type with the same number of components
130 * as the original type - i.e. int to float, not int to vec4.
132 to = glsl_type::get_instance(GLSL_TYPE_FLOAT, from->type->vector_elements,
133 from->type->matrix_columns);
135 switch (from->type->base_type) {
137 from = new(ctx) ir_expression(ir_unop_i2f, to, from, NULL);
140 from = new(ctx) ir_expression(ir_unop_u2f, to, from, NULL);
143 from = new(ctx) ir_expression(ir_unop_b2f, to, from, NULL);
153 static const struct glsl_type *
154 arithmetic_result_type(ir_rvalue * &value_a, ir_rvalue * &value_b,
156 struct _mesa_glsl_parse_state *state, YYLTYPE *loc)
158 const glsl_type *type_a = value_a->type;
159 const glsl_type *type_b = value_b->type;
161 /* From GLSL 1.50 spec, page 56:
163 * "The arithmetic binary operators add (+), subtract (-),
164 * multiply (*), and divide (/) operate on integer and
165 * floating-point scalars, vectors, and matrices."
167 if (!type_a->is_numeric() || !type_b->is_numeric()) {
168 _mesa_glsl_error(loc, state,
169 "Operands to arithmetic operators must be numeric");
170 return glsl_type::error_type;
174 /* "If one operand is floating-point based and the other is
175 * not, then the conversions from Section 4.1.10 "Implicit
176 * Conversions" are applied to the non-floating-point-based operand."
178 if (!apply_implicit_conversion(type_a, value_b, state)
179 && !apply_implicit_conversion(type_b, value_a, state)) {
180 _mesa_glsl_error(loc, state,
181 "Could not implicitly convert operands to "
182 "arithmetic operator");
183 return glsl_type::error_type;
185 type_a = value_a->type;
186 type_b = value_b->type;
188 /* "If the operands are integer types, they must both be signed or
191 * From this rule and the preceeding conversion it can be inferred that
192 * both types must be GLSL_TYPE_FLOAT, or GLSL_TYPE_UINT, or GLSL_TYPE_INT.
193 * The is_numeric check above already filtered out the case where either
194 * type is not one of these, so now the base types need only be tested for
197 if (type_a->base_type != type_b->base_type) {
198 _mesa_glsl_error(loc, state,
199 "base type mismatch for arithmetic operator");
200 return glsl_type::error_type;
203 /* "All arithmetic binary operators result in the same fundamental type
204 * (signed integer, unsigned integer, or floating-point) as the
205 * operands they operate on, after operand type conversion. After
206 * conversion, the following cases are valid
208 * * The two operands are scalars. In this case the operation is
209 * applied, resulting in a scalar."
211 if (type_a->is_scalar() && type_b->is_scalar())
214 /* "* One operand is a scalar, and the other is a vector or matrix.
215 * In this case, the scalar operation is applied independently to each
216 * component of the vector or matrix, resulting in the same size
219 if (type_a->is_scalar()) {
220 if (!type_b->is_scalar())
222 } else if (type_b->is_scalar()) {
226 /* All of the combinations of <scalar, scalar>, <vector, scalar>,
227 * <scalar, vector>, <scalar, matrix>, and <matrix, scalar> have been
230 assert(!type_a->is_scalar());
231 assert(!type_b->is_scalar());
233 /* "* The two operands are vectors of the same size. In this case, the
234 * operation is done component-wise resulting in the same size
237 if (type_a->is_vector() && type_b->is_vector()) {
238 if (type_a == type_b) {
241 _mesa_glsl_error(loc, state,
242 "vector size mismatch for arithmetic operator");
243 return glsl_type::error_type;
247 /* All of the combinations of <scalar, scalar>, <vector, scalar>,
248 * <scalar, vector>, <scalar, matrix>, <matrix, scalar>, and
249 * <vector, vector> have been handled. At least one of the operands must
250 * be matrix. Further, since there are no integer matrix types, the base
251 * type of both operands must be float.
253 assert(type_a->is_matrix() || type_b->is_matrix());
254 assert(type_a->base_type == GLSL_TYPE_FLOAT);
255 assert(type_b->base_type == GLSL_TYPE_FLOAT);
257 /* "* The operator is add (+), subtract (-), or divide (/), and the
258 * operands are matrices with the same number of rows and the same
259 * number of columns. In this case, the operation is done component-
260 * wise resulting in the same size matrix."
261 * * The operator is multiply (*), where both operands are matrices or
262 * one operand is a vector and the other a matrix. A right vector
263 * operand is treated as a column vector and a left vector operand as a
264 * row vector. In all these cases, it is required that the number of
265 * columns of the left operand is equal to the number of rows of the
266 * right operand. Then, the multiply (*) operation does a linear
267 * algebraic multiply, yielding an object that has the same number of
268 * rows as the left operand and the same number of columns as the right
269 * operand. Section 5.10 "Vector and Matrix Operations" explains in
270 * more detail how vectors and matrices are operated on."
273 if (type_a == type_b)
276 if (type_a->is_matrix() && type_b->is_matrix()) {
277 /* Matrix multiply. The columns of A must match the rows of B. Given
278 * the other previously tested constraints, this means the vector type
279 * of a row from A must be the same as the vector type of a column from
282 if (type_a->row_type() == type_b->column_type()) {
283 /* The resulting matrix has the number of columns of matrix B and
284 * the number of rows of matrix A. We get the row count of A by
285 * looking at the size of a vector that makes up a column. The
286 * transpose (size of a row) is done for B.
288 const glsl_type *const type =
289 glsl_type::get_instance(type_a->base_type,
290 type_a->column_type()->vector_elements,
291 type_b->row_type()->vector_elements);
292 assert(type != glsl_type::error_type);
296 } else if (type_a->is_matrix()) {
297 /* A is a matrix and B is a column vector. Columns of A must match
298 * rows of B. Given the other previously tested constraints, this
299 * means the vector type of a row from A must be the same as the
300 * vector the type of B.
302 if (type_a->row_type() == type_b) {
303 /* The resulting vector has a number of elements equal to
304 * the number of rows of matrix A. */
305 const glsl_type *const type =
306 glsl_type::get_instance(type_a->base_type,
307 type_a->column_type()->vector_elements,
309 assert(type != glsl_type::error_type);
314 assert(type_b->is_matrix());
316 /* A is a row vector and B is a matrix. Columns of A must match rows
317 * of B. Given the other previously tested constraints, this means
318 * the type of A must be the same as the vector type of a column from
321 if (type_a == type_b->column_type()) {
322 /* The resulting vector has a number of elements equal to
323 * the number of columns of matrix B. */
324 const glsl_type *const type =
325 glsl_type::get_instance(type_a->base_type,
326 type_b->row_type()->vector_elements,
328 assert(type != glsl_type::error_type);
334 _mesa_glsl_error(loc, state, "size mismatch for matrix multiplication");
335 return glsl_type::error_type;
339 /* "All other cases are illegal."
341 _mesa_glsl_error(loc, state, "type mismatch");
342 return glsl_type::error_type;
346 static const struct glsl_type *
347 unary_arithmetic_result_type(const struct glsl_type *type,
348 struct _mesa_glsl_parse_state *state, YYLTYPE *loc)
350 /* From GLSL 1.50 spec, page 57:
352 * "The arithmetic unary operators negate (-), post- and pre-increment
353 * and decrement (-- and ++) operate on integer or floating-point
354 * values (including vectors and matrices). All unary operators work
355 * component-wise on their operands. These result with the same type
358 if (!type->is_numeric()) {
359 _mesa_glsl_error(loc, state,
360 "Operands to arithmetic operators must be numeric");
361 return glsl_type::error_type;
368 * \brief Return the result type of a bit-logic operation.
370 * If the given types to the bit-logic operator are invalid, return
371 * glsl_type::error_type.
373 * \param type_a Type of LHS of bit-logic op
374 * \param type_b Type of RHS of bit-logic op
376 static const struct glsl_type *
377 bit_logic_result_type(const struct glsl_type *type_a,
378 const struct glsl_type *type_b,
380 struct _mesa_glsl_parse_state *state, YYLTYPE *loc)
382 if (state->language_version < 130) {
383 _mesa_glsl_error(loc, state, "bit operations require GLSL 1.30");
384 return glsl_type::error_type;
387 /* From page 50 (page 56 of PDF) of GLSL 1.30 spec:
389 * "The bitwise operators and (&), exclusive-or (^), and inclusive-or
390 * (|). The operands must be of type signed or unsigned integers or
393 if (!type_a->is_integer()) {
394 _mesa_glsl_error(loc, state, "LHS of `%s' must be an integer",
395 ast_expression::operator_string(op));
396 return glsl_type::error_type;
398 if (!type_b->is_integer()) {
399 _mesa_glsl_error(loc, state, "RHS of `%s' must be an integer",
400 ast_expression::operator_string(op));
401 return glsl_type::error_type;
404 /* "The fundamental types of the operands (signed or unsigned) must
407 if (type_a->base_type != type_b->base_type) {
408 _mesa_glsl_error(loc, state, "operands of `%s' must have the same "
409 "base type", ast_expression::operator_string(op));
410 return glsl_type::error_type;
413 /* "The operands cannot be vectors of differing size." */
414 if (type_a->is_vector() &&
415 type_b->is_vector() &&
416 type_a->vector_elements != type_b->vector_elements) {
417 _mesa_glsl_error(loc, state, "operands of `%s' cannot be vectors of "
418 "different sizes", ast_expression::operator_string(op));
419 return glsl_type::error_type;
422 /* "If one operand is a scalar and the other a vector, the scalar is
423 * applied component-wise to the vector, resulting in the same type as
424 * the vector. The fundamental types of the operands [...] will be the
425 * resulting fundamental type."
427 if (type_a->is_scalar())
433 static const struct glsl_type *
434 modulus_result_type(const struct glsl_type *type_a,
435 const struct glsl_type *type_b,
436 struct _mesa_glsl_parse_state *state, YYLTYPE *loc)
438 if (state->language_version < 130) {
439 _mesa_glsl_error(loc, state,
440 "operator '%%' is reserved in %s",
441 state->version_string);
442 return glsl_type::error_type;
445 /* From GLSL 1.50 spec, page 56:
446 * "The operator modulus (%) operates on signed or unsigned integers or
447 * integer vectors. The operand types must both be signed or both be
450 if (!type_a->is_integer() || !type_b->is_integer()
451 || (type_a->base_type != type_b->base_type)) {
452 _mesa_glsl_error(loc, state, "type mismatch");
453 return glsl_type::error_type;
456 /* "The operands cannot be vectors of differing size. If one operand is
457 * a scalar and the other vector, then the scalar is applied component-
458 * wise to the vector, resulting in the same type as the vector. If both
459 * are vectors of the same size, the result is computed component-wise."
461 if (type_a->is_vector()) {
462 if (!type_b->is_vector()
463 || (type_a->vector_elements == type_b->vector_elements))
468 /* "The operator modulus (%) is not defined for any other data types
469 * (non-integer types)."
471 _mesa_glsl_error(loc, state, "type mismatch");
472 return glsl_type::error_type;
476 static const struct glsl_type *
477 relational_result_type(ir_rvalue * &value_a, ir_rvalue * &value_b,
478 struct _mesa_glsl_parse_state *state, YYLTYPE *loc)
480 const glsl_type *type_a = value_a->type;
481 const glsl_type *type_b = value_b->type;
483 /* From GLSL 1.50 spec, page 56:
484 * "The relational operators greater than (>), less than (<), greater
485 * than or equal (>=), and less than or equal (<=) operate only on
486 * scalar integer and scalar floating-point expressions."
488 if (!type_a->is_numeric()
489 || !type_b->is_numeric()
490 || !type_a->is_scalar()
491 || !type_b->is_scalar()) {
492 _mesa_glsl_error(loc, state,
493 "Operands to relational operators must be scalar and "
495 return glsl_type::error_type;
498 /* "Either the operands' types must match, or the conversions from
499 * Section 4.1.10 "Implicit Conversions" will be applied to the integer
500 * operand, after which the types must match."
502 if (!apply_implicit_conversion(type_a, value_b, state)
503 && !apply_implicit_conversion(type_b, value_a, state)) {
504 _mesa_glsl_error(loc, state,
505 "Could not implicitly convert operands to "
506 "relational operator");
507 return glsl_type::error_type;
509 type_a = value_a->type;
510 type_b = value_b->type;
512 if (type_a->base_type != type_b->base_type) {
513 _mesa_glsl_error(loc, state, "base type mismatch");
514 return glsl_type::error_type;
517 /* "The result is scalar Boolean."
519 return glsl_type::bool_type;
523 * \brief Return the result type of a bit-shift operation.
525 * If the given types to the bit-shift operator are invalid, return
526 * glsl_type::error_type.
528 * \param type_a Type of LHS of bit-shift op
529 * \param type_b Type of RHS of bit-shift op
531 static const struct glsl_type *
532 shift_result_type(const struct glsl_type *type_a,
533 const struct glsl_type *type_b,
535 struct _mesa_glsl_parse_state *state, YYLTYPE *loc)
537 if (state->language_version < 130) {
538 _mesa_glsl_error(loc, state, "bit operations require GLSL 1.30");
539 return glsl_type::error_type;
542 /* From page 50 (page 56 of the PDF) of the GLSL 1.30 spec:
544 * "The shift operators (<<) and (>>). For both operators, the operands
545 * must be signed or unsigned integers or integer vectors. One operand
546 * can be signed while the other is unsigned."
548 if (!type_a->is_integer()) {
549 _mesa_glsl_error(loc, state, "LHS of operator %s must be an integer or "
550 "integer vector", ast_expression::operator_string(op));
551 return glsl_type::error_type;
554 if (!type_b->is_integer()) {
555 _mesa_glsl_error(loc, state, "RHS of operator %s must be an integer or "
556 "integer vector", ast_expression::operator_string(op));
557 return glsl_type::error_type;
560 /* "If the first operand is a scalar, the second operand has to be
563 if (type_a->is_scalar() && !type_b->is_scalar()) {
564 _mesa_glsl_error(loc, state, "If the first operand of %s is scalar, the "
565 "second must be scalar as well",
566 ast_expression::operator_string(op));
567 return glsl_type::error_type;
570 /* If both operands are vectors, check that they have same number of
573 if (type_a->is_vector() &&
574 type_b->is_vector() &&
575 type_a->vector_elements != type_b->vector_elements) {
576 _mesa_glsl_error(loc, state, "Vector operands to operator %s must "
577 "have same number of elements",
578 ast_expression::operator_string(op));
579 return glsl_type::error_type;
582 /* "In all cases, the resulting type will be the same type as the left
589 * Validates that a value can be assigned to a location with a specified type
591 * Validates that \c rhs can be assigned to some location. If the types are
592 * not an exact match but an automatic conversion is possible, \c rhs will be
596 * \c NULL if \c rhs cannot be assigned to a location with type \c lhs_type.
597 * Otherwise the actual RHS to be assigned will be returned. This may be
598 * \c rhs, or it may be \c rhs after some type conversion.
601 * In addition to being used for assignments, this function is used to
602 * type-check return values.
605 validate_assignment(struct _mesa_glsl_parse_state *state,
606 const glsl_type *lhs_type, ir_rvalue *rhs)
608 /* If there is already some error in the RHS, just return it. Anything
609 * else will lead to an avalanche of error message back to the user.
611 if (rhs->type->is_error())
614 /* If the types are identical, the assignment can trivially proceed.
616 if (rhs->type == lhs_type)
619 /* If the array element types are the same and the size of the LHS is zero,
620 * the assignment is okay.
622 * Note: Whole-array assignments are not permitted in GLSL 1.10, but this
623 * is handled by ir_dereference::is_lvalue.
625 if (lhs_type->is_array() && rhs->type->is_array()
626 && (lhs_type->element_type() == rhs->type->element_type())
627 && (lhs_type->array_size() == 0)) {
631 /* Check for implicit conversion in GLSL 1.20 */
632 if (apply_implicit_conversion(lhs_type, rhs, state)) {
633 if (rhs->type == lhs_type)
641 do_assignment(exec_list *instructions, struct _mesa_glsl_parse_state *state,
642 ir_rvalue *lhs, ir_rvalue *rhs,
646 bool error_emitted = (lhs->type->is_error() || rhs->type->is_error());
648 if (!error_emitted) {
649 if (lhs->variable_referenced() != NULL
650 && lhs->variable_referenced()->read_only) {
651 _mesa_glsl_error(&lhs_loc, state,
652 "assignment to read-only variable '%s'",
653 lhs->variable_referenced()->name);
654 error_emitted = true;
656 } else if (!lhs->is_lvalue()) {
657 _mesa_glsl_error(& lhs_loc, state, "non-lvalue in assignment");
658 error_emitted = true;
661 if (state->es_shader && lhs->type->is_array()) {
662 _mesa_glsl_error(&lhs_loc, state, "whole array assignment is not "
663 "allowed in GLSL ES 1.00.");
664 error_emitted = true;
668 ir_rvalue *new_rhs = validate_assignment(state, lhs->type, rhs);
669 if (new_rhs == NULL) {
670 _mesa_glsl_error(& lhs_loc, state, "type mismatch");
674 /* If the LHS array was not declared with a size, it takes it size from
675 * the RHS. If the LHS is an l-value and a whole array, it must be a
676 * dereference of a variable. Any other case would require that the LHS
677 * is either not an l-value or not a whole array.
679 if (lhs->type->array_size() == 0) {
680 ir_dereference *const d = lhs->as_dereference();
684 ir_variable *const var = d->variable_referenced();
688 if (var->max_array_access >= unsigned(rhs->type->array_size())) {
689 /* FINISHME: This should actually log the location of the RHS. */
690 _mesa_glsl_error(& lhs_loc, state, "array size must be > %u due to "
692 var->max_array_access);
695 var->type = glsl_type::get_array_instance(lhs->type->element_type(),
696 rhs->type->array_size());
701 /* Most callers of do_assignment (assign, add_assign, pre_inc/dec,
702 * but not post_inc) need the converted assigned value as an rvalue
703 * to handle things like:
707 * So we always just store the computed value being assigned to a
708 * temporary and return a deref of that temporary. If the rvalue
709 * ends up not being used, the temp will get copy-propagated out.
711 ir_variable *var = new(ctx) ir_variable(rhs->type, "assignment_tmp",
713 ir_dereference_variable *deref_var = new(ctx) ir_dereference_variable(var);
714 instructions->push_tail(var);
715 instructions->push_tail(new(ctx) ir_assignment(deref_var,
718 deref_var = new(ctx) ir_dereference_variable(var);
721 instructions->push_tail(new(ctx) ir_assignment(lhs, deref_var, NULL));
723 return new(ctx) ir_dereference_variable(var);
727 get_lvalue_copy(exec_list *instructions, ir_rvalue *lvalue)
729 void *ctx = ralloc_parent(lvalue);
732 var = new(ctx) ir_variable(lvalue->type, "_post_incdec_tmp",
734 instructions->push_tail(var);
735 var->mode = ir_var_auto;
737 instructions->push_tail(new(ctx) ir_assignment(new(ctx) ir_dereference_variable(var),
740 /* Once we've created this temporary, mark it read only so it's no
741 * longer considered an lvalue.
743 var->read_only = true;
745 return new(ctx) ir_dereference_variable(var);
750 ast_node::hir(exec_list *instructions,
751 struct _mesa_glsl_parse_state *state)
760 mark_whole_array_access(ir_rvalue *access)
762 ir_dereference_variable *deref = access->as_dereference_variable();
765 deref->var->max_array_access = deref->type->length - 1;
770 do_comparison(void *mem_ctx, int operation, ir_rvalue *op0, ir_rvalue *op1)
773 ir_rvalue *cmp = NULL;
775 if (operation == ir_binop_all_equal)
776 join_op = ir_binop_logic_and;
778 join_op = ir_binop_logic_or;
780 switch (op0->type->base_type) {
781 case GLSL_TYPE_FLOAT:
785 return new(mem_ctx) ir_expression(operation, op0, op1);
787 case GLSL_TYPE_ARRAY: {
788 for (unsigned int i = 0; i < op0->type->length; i++) {
789 ir_rvalue *e0, *e1, *result;
791 e0 = new(mem_ctx) ir_dereference_array(op0->clone(mem_ctx, NULL),
792 new(mem_ctx) ir_constant(i));
793 e1 = new(mem_ctx) ir_dereference_array(op1->clone(mem_ctx, NULL),
794 new(mem_ctx) ir_constant(i));
795 result = do_comparison(mem_ctx, operation, e0, e1);
798 cmp = new(mem_ctx) ir_expression(join_op, cmp, result);
804 mark_whole_array_access(op0);
805 mark_whole_array_access(op1);
809 case GLSL_TYPE_STRUCT: {
810 for (unsigned int i = 0; i < op0->type->length; i++) {
811 ir_rvalue *e0, *e1, *result;
812 const char *field_name = op0->type->fields.structure[i].name;
814 e0 = new(mem_ctx) ir_dereference_record(op0->clone(mem_ctx, NULL),
816 e1 = new(mem_ctx) ir_dereference_record(op1->clone(mem_ctx, NULL),
818 result = do_comparison(mem_ctx, operation, e0, e1);
821 cmp = new(mem_ctx) ir_expression(join_op, cmp, result);
829 case GLSL_TYPE_ERROR:
831 case GLSL_TYPE_SAMPLER:
832 /* I assume a comparison of a struct containing a sampler just
833 * ignores the sampler present in the type.
838 assert(!"Should not get here.");
843 cmp = new(mem_ctx) ir_constant(true);
849 ast_expression::hir(exec_list *instructions,
850 struct _mesa_glsl_parse_state *state)
853 static const int operations[AST_NUM_OPERATORS] = {
854 -1, /* ast_assign doesn't convert to ir_expression. */
855 -1, /* ast_plus doesn't convert to ir_expression. */
879 /* Note: The following block of expression types actually convert
880 * to multiple IR instructions.
882 ir_binop_mul, /* ast_mul_assign */
883 ir_binop_div, /* ast_div_assign */
884 ir_binop_mod, /* ast_mod_assign */
885 ir_binop_add, /* ast_add_assign */
886 ir_binop_sub, /* ast_sub_assign */
887 ir_binop_lshift, /* ast_ls_assign */
888 ir_binop_rshift, /* ast_rs_assign */
889 ir_binop_bit_and, /* ast_and_assign */
890 ir_binop_bit_xor, /* ast_xor_assign */
891 ir_binop_bit_or, /* ast_or_assign */
893 -1, /* ast_conditional doesn't convert to ir_expression. */
894 ir_binop_add, /* ast_pre_inc. */
895 ir_binop_sub, /* ast_pre_dec. */
896 ir_binop_add, /* ast_post_inc. */
897 ir_binop_sub, /* ast_post_dec. */
898 -1, /* ast_field_selection doesn't conv to ir_expression. */
899 -1, /* ast_array_index doesn't convert to ir_expression. */
900 -1, /* ast_function_call doesn't conv to ir_expression. */
901 -1, /* ast_identifier doesn't convert to ir_expression. */
902 -1, /* ast_int_constant doesn't convert to ir_expression. */
903 -1, /* ast_uint_constant doesn't conv to ir_expression. */
904 -1, /* ast_float_constant doesn't conv to ir_expression. */
905 -1, /* ast_bool_constant doesn't conv to ir_expression. */
906 -1, /* ast_sequence doesn't convert to ir_expression. */
908 ir_rvalue *result = NULL;
910 const struct glsl_type *type = glsl_type::error_type;
911 bool error_emitted = false;
914 loc = this->get_location();
916 switch (this->oper) {
918 op[0] = this->subexpressions[0]->hir(instructions, state);
919 op[1] = this->subexpressions[1]->hir(instructions, state);
921 result = do_assignment(instructions, state, op[0], op[1],
922 this->subexpressions[0]->get_location());
923 error_emitted = result->type->is_error();
929 op[0] = this->subexpressions[0]->hir(instructions, state);
931 type = unary_arithmetic_result_type(op[0]->type, state, & loc);
933 error_emitted = type->is_error();
939 op[0] = this->subexpressions[0]->hir(instructions, state);
941 type = unary_arithmetic_result_type(op[0]->type, state, & loc);
943 error_emitted = type->is_error();
945 result = new(ctx) ir_expression(operations[this->oper], type,
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),
959 error_emitted = type->is_error();
961 result = new(ctx) ir_expression(operations[this->oper], type,
966 op[0] = this->subexpressions[0]->hir(instructions, state);
967 op[1] = this->subexpressions[1]->hir(instructions, state);
969 type = modulus_result_type(op[0]->type, op[1]->type, state, & loc);
971 assert(operations[this->oper] == ir_binop_mod);
973 result = new(ctx) ir_expression(operations[this->oper], type,
975 error_emitted = type->is_error();
980 if (state->language_version < 130) {
981 _mesa_glsl_error(&loc, state, "operator %s requires GLSL 1.30",
982 operator_string(this->oper));
983 error_emitted = true;
986 op[0] = this->subexpressions[0]->hir(instructions, state);
987 op[1] = this->subexpressions[1]->hir(instructions, state);
988 type = shift_result_type(op[0]->type, op[1]->type, this->oper, state,
990 result = new(ctx) ir_expression(operations[this->oper], type,
992 error_emitted = op[0]->type->is_error() || op[1]->type->is_error();
999 op[0] = this->subexpressions[0]->hir(instructions, state);
1000 op[1] = this->subexpressions[1]->hir(instructions, state);
1002 type = relational_result_type(op[0], op[1], state, & loc);
1004 /* The relational operators must either generate an error or result
1005 * in a scalar boolean. See page 57 of the GLSL 1.50 spec.
1007 assert(type->is_error()
1008 || ((type->base_type == GLSL_TYPE_BOOL)
1009 && type->is_scalar()));
1011 result = new(ctx) ir_expression(operations[this->oper], type,
1013 error_emitted = type->is_error();
1018 op[0] = this->subexpressions[0]->hir(instructions, state);
1019 op[1] = this->subexpressions[1]->hir(instructions, state);
1021 /* From page 58 (page 64 of the PDF) of the GLSL 1.50 spec:
1023 * "The equality operators equal (==), and not equal (!=)
1024 * operate on all types. They result in a scalar Boolean. If
1025 * the operand types do not match, then there must be a
1026 * conversion from Section 4.1.10 "Implicit Conversions"
1027 * applied to one operand that can make them match, in which
1028 * case this conversion is done."
1030 if ((!apply_implicit_conversion(op[0]->type, op[1], state)
1031 && !apply_implicit_conversion(op[1]->type, op[0], state))
1032 || (op[0]->type != op[1]->type)) {
1033 _mesa_glsl_error(& loc, state, "operands of `%s' must have the same "
1034 "type", (this->oper == ast_equal) ? "==" : "!=");
1035 error_emitted = true;
1036 } else if ((state->language_version <= 110)
1037 && (op[0]->type->is_array() || op[1]->type->is_array())) {
1038 _mesa_glsl_error(& loc, state, "array comparisons forbidden in "
1040 error_emitted = true;
1043 result = do_comparison(ctx, operations[this->oper], op[0], op[1]);
1044 type = glsl_type::bool_type;
1046 assert(error_emitted || (result->type == glsl_type::bool_type));
1052 op[0] = this->subexpressions[0]->hir(instructions, state);
1053 op[1] = this->subexpressions[1]->hir(instructions, state);
1054 type = bit_logic_result_type(op[0]->type, op[1]->type, this->oper,
1056 result = new(ctx) ir_expression(operations[this->oper], type,
1058 error_emitted = op[0]->type->is_error() || op[1]->type->is_error();
1062 op[0] = this->subexpressions[0]->hir(instructions, state);
1064 if (state->language_version < 130) {
1065 _mesa_glsl_error(&loc, state, "bit-wise operations require GLSL 1.30");
1066 error_emitted = true;
1069 if (!op[0]->type->is_integer()) {
1070 _mesa_glsl_error(&loc, state, "operand of `~' must be an integer");
1071 error_emitted = true;
1075 result = new(ctx) ir_expression(ir_unop_bit_not, type, op[0], NULL);
1078 case ast_logic_and: {
1079 op[0] = this->subexpressions[0]->hir(instructions, state);
1081 if (!op[0]->type->is_boolean() || !op[0]->type->is_scalar()) {
1082 YYLTYPE loc = this->subexpressions[0]->get_location();
1084 _mesa_glsl_error(& loc, state, "LHS of `%s' must be scalar boolean",
1085 operator_string(this->oper));
1086 error_emitted = true;
1089 ir_constant *op0_const = op[0]->constant_expression_value();
1091 if (op0_const->value.b[0]) {
1092 op[1] = this->subexpressions[1]->hir(instructions, state);
1094 if (!op[1]->type->is_boolean() || !op[1]->type->is_scalar()) {
1095 YYLTYPE loc = this->subexpressions[1]->get_location();
1097 _mesa_glsl_error(& loc, state,
1098 "RHS of `%s' must be scalar boolean",
1099 operator_string(this->oper));
1100 error_emitted = true;
1106 type = glsl_type::bool_type;
1108 ir_variable *const tmp = new(ctx) ir_variable(glsl_type::bool_type,
1111 instructions->push_tail(tmp);
1113 ir_if *const stmt = new(ctx) ir_if(op[0]);
1114 instructions->push_tail(stmt);
1116 op[1] = this->subexpressions[1]->hir(&stmt->then_instructions, state);
1118 if (!op[1]->type->is_boolean() || !op[1]->type->is_scalar()) {
1119 YYLTYPE loc = this->subexpressions[1]->get_location();
1121 _mesa_glsl_error(& loc, state,
1122 "RHS of `%s' must be scalar boolean",
1123 operator_string(this->oper));
1124 error_emitted = true;
1127 ir_dereference *const then_deref = new(ctx) ir_dereference_variable(tmp);
1128 ir_assignment *const then_assign =
1129 new(ctx) ir_assignment(then_deref, op[1], NULL);
1130 stmt->then_instructions.push_tail(then_assign);
1132 ir_dereference *const else_deref = new(ctx) ir_dereference_variable(tmp);
1133 ir_assignment *const else_assign =
1134 new(ctx) ir_assignment(else_deref, new(ctx) ir_constant(false), NULL);
1135 stmt->else_instructions.push_tail(else_assign);
1137 result = new(ctx) ir_dereference_variable(tmp);
1143 case ast_logic_or: {
1144 op[0] = this->subexpressions[0]->hir(instructions, state);
1146 if (!op[0]->type->is_boolean() || !op[0]->type->is_scalar()) {
1147 YYLTYPE loc = this->subexpressions[0]->get_location();
1149 _mesa_glsl_error(& loc, state, "LHS of `%s' must be scalar boolean",
1150 operator_string(this->oper));
1151 error_emitted = true;
1154 ir_constant *op0_const = op[0]->constant_expression_value();
1156 if (op0_const->value.b[0]) {
1159 op[1] = this->subexpressions[1]->hir(instructions, state);
1161 if (!op[1]->type->is_boolean() || !op[1]->type->is_scalar()) {
1162 YYLTYPE loc = this->subexpressions[1]->get_location();
1164 _mesa_glsl_error(& loc, state,
1165 "RHS of `%s' must be scalar boolean",
1166 operator_string(this->oper));
1167 error_emitted = true;
1171 type = glsl_type::bool_type;
1173 ir_variable *const tmp = new(ctx) ir_variable(glsl_type::bool_type,
1176 instructions->push_tail(tmp);
1178 ir_if *const stmt = new(ctx) ir_if(op[0]);
1179 instructions->push_tail(stmt);
1181 op[1] = this->subexpressions[1]->hir(&stmt->else_instructions, state);
1183 if (!op[1]->type->is_boolean() || !op[1]->type->is_scalar()) {
1184 YYLTYPE loc = this->subexpressions[1]->get_location();
1186 _mesa_glsl_error(& loc, state, "RHS of `%s' must be scalar boolean",
1187 operator_string(this->oper));
1188 error_emitted = true;
1191 ir_dereference *const then_deref = new(ctx) ir_dereference_variable(tmp);
1192 ir_assignment *const then_assign =
1193 new(ctx) ir_assignment(then_deref, new(ctx) ir_constant(true), NULL);
1194 stmt->then_instructions.push_tail(then_assign);
1196 ir_dereference *const else_deref = new(ctx) ir_dereference_variable(tmp);
1197 ir_assignment *const else_assign =
1198 new(ctx) ir_assignment(else_deref, op[1], NULL);
1199 stmt->else_instructions.push_tail(else_assign);
1201 result = new(ctx) ir_dereference_variable(tmp);
1208 op[0] = this->subexpressions[0]->hir(instructions, state);
1209 op[1] = this->subexpressions[1]->hir(instructions, state);
1212 result = new(ctx) ir_expression(operations[this->oper], glsl_type::bool_type,
1214 type = glsl_type::bool_type;
1218 op[0] = this->subexpressions[0]->hir(instructions, state);
1220 if (!op[0]->type->is_boolean() || !op[0]->type->is_scalar()) {
1221 YYLTYPE loc = this->subexpressions[0]->get_location();
1223 _mesa_glsl_error(& loc, state,
1224 "operand of `!' must be scalar boolean");
1225 error_emitted = true;
1228 result = new(ctx) ir_expression(operations[this->oper], glsl_type::bool_type,
1230 type = glsl_type::bool_type;
1233 case ast_mul_assign:
1234 case ast_div_assign:
1235 case ast_add_assign:
1236 case ast_sub_assign: {
1237 op[0] = this->subexpressions[0]->hir(instructions, state);
1238 op[1] = this->subexpressions[1]->hir(instructions, state);
1240 type = arithmetic_result_type(op[0], op[1],
1241 (this->oper == ast_mul_assign),
1244 ir_rvalue *temp_rhs = new(ctx) ir_expression(operations[this->oper], type,
1247 result = do_assignment(instructions, state,
1248 op[0]->clone(ctx, NULL), temp_rhs,
1249 this->subexpressions[0]->get_location());
1250 type = result->type;
1251 error_emitted = (op[0]->type->is_error());
1253 /* GLSL 1.10 does not allow array assignment. However, we don't have to
1254 * explicitly test for this because none of the binary expression
1255 * operators allow array operands either.
1261 case ast_mod_assign: {
1262 op[0] = this->subexpressions[0]->hir(instructions, state);
1263 op[1] = this->subexpressions[1]->hir(instructions, state);
1265 type = modulus_result_type(op[0]->type, op[1]->type, state, & loc);
1267 assert(operations[this->oper] == ir_binop_mod);
1269 ir_rvalue *temp_rhs;
1270 temp_rhs = new(ctx) ir_expression(operations[this->oper], type,
1273 result = do_assignment(instructions, state,
1274 op[0]->clone(ctx, NULL), temp_rhs,
1275 this->subexpressions[0]->get_location());
1276 type = result->type;
1277 error_emitted = type->is_error();
1282 case ast_rs_assign: {
1283 op[0] = this->subexpressions[0]->hir(instructions, state);
1284 op[1] = this->subexpressions[1]->hir(instructions, state);
1285 type = shift_result_type(op[0]->type, op[1]->type, this->oper, state,
1287 ir_rvalue *temp_rhs = new(ctx) ir_expression(operations[this->oper],
1288 type, op[0], op[1]);
1289 result = do_assignment(instructions, state, op[0]->clone(ctx, NULL),
1291 this->subexpressions[0]->get_location());
1292 error_emitted = op[0]->type->is_error() || op[1]->type->is_error();
1296 case ast_and_assign:
1297 case ast_xor_assign:
1298 case ast_or_assign: {
1299 op[0] = this->subexpressions[0]->hir(instructions, state);
1300 op[1] = this->subexpressions[1]->hir(instructions, state);
1301 type = bit_logic_result_type(op[0]->type, op[1]->type, this->oper,
1303 ir_rvalue *temp_rhs = new(ctx) ir_expression(operations[this->oper],
1304 type, op[0], op[1]);
1305 result = do_assignment(instructions, state, op[0]->clone(ctx, NULL),
1307 this->subexpressions[0]->get_location());
1308 error_emitted = op[0]->type->is_error() || op[1]->type->is_error();
1312 case ast_conditional: {
1313 op[0] = this->subexpressions[0]->hir(instructions, state);
1315 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1317 * "The ternary selection operator (?:). It operates on three
1318 * expressions (exp1 ? exp2 : exp3). This operator evaluates the
1319 * first expression, which must result in a scalar Boolean."
1321 if (!op[0]->type->is_boolean() || !op[0]->type->is_scalar()) {
1322 YYLTYPE loc = this->subexpressions[0]->get_location();
1324 _mesa_glsl_error(& loc, state, "?: condition must be scalar boolean");
1325 error_emitted = true;
1328 /* The :? operator is implemented by generating an anonymous temporary
1329 * followed by an if-statement. The last instruction in each branch of
1330 * the if-statement assigns a value to the anonymous temporary. This
1331 * temporary is the r-value of the expression.
1333 exec_list then_instructions;
1334 exec_list else_instructions;
1336 op[1] = this->subexpressions[1]->hir(&then_instructions, state);
1337 op[2] = this->subexpressions[2]->hir(&else_instructions, state);
1339 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1341 * "The second and third expressions can be any type, as
1342 * long their types match, or there is a conversion in
1343 * Section 4.1.10 "Implicit Conversions" that can be applied
1344 * to one of the expressions to make their types match. This
1345 * resulting matching type is the type of the entire
1348 if ((!apply_implicit_conversion(op[1]->type, op[2], state)
1349 && !apply_implicit_conversion(op[2]->type, op[1], state))
1350 || (op[1]->type != op[2]->type)) {
1351 YYLTYPE loc = this->subexpressions[1]->get_location();
1353 _mesa_glsl_error(& loc, state, "Second and third operands of ?: "
1354 "operator must have matching types.");
1355 error_emitted = true;
1356 type = glsl_type::error_type;
1361 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1363 * "The second and third expressions must be the same type, but can
1364 * be of any type other than an array."
1366 if ((state->language_version <= 110) && type->is_array()) {
1367 _mesa_glsl_error(& loc, state, "Second and third operands of ?: "
1368 "operator must not be arrays.");
1369 error_emitted = true;
1372 ir_constant *cond_val = op[0]->constant_expression_value();
1373 ir_constant *then_val = op[1]->constant_expression_value();
1374 ir_constant *else_val = op[2]->constant_expression_value();
1376 if (then_instructions.is_empty()
1377 && else_instructions.is_empty()
1378 && (cond_val != NULL) && (then_val != NULL) && (else_val != NULL)) {
1379 result = (cond_val->value.b[0]) ? then_val : else_val;
1381 ir_variable *const tmp =
1382 new(ctx) ir_variable(type, "conditional_tmp", ir_var_temporary);
1383 instructions->push_tail(tmp);
1385 ir_if *const stmt = new(ctx) ir_if(op[0]);
1386 instructions->push_tail(stmt);
1388 then_instructions.move_nodes_to(& stmt->then_instructions);
1389 ir_dereference *const then_deref =
1390 new(ctx) ir_dereference_variable(tmp);
1391 ir_assignment *const then_assign =
1392 new(ctx) ir_assignment(then_deref, op[1], NULL);
1393 stmt->then_instructions.push_tail(then_assign);
1395 else_instructions.move_nodes_to(& stmt->else_instructions);
1396 ir_dereference *const else_deref =
1397 new(ctx) ir_dereference_variable(tmp);
1398 ir_assignment *const else_assign =
1399 new(ctx) ir_assignment(else_deref, op[2], NULL);
1400 stmt->else_instructions.push_tail(else_assign);
1402 result = new(ctx) ir_dereference_variable(tmp);
1409 op[0] = this->subexpressions[0]->hir(instructions, state);
1410 if (op[0]->type->base_type == GLSL_TYPE_FLOAT)
1411 op[1] = new(ctx) ir_constant(1.0f);
1413 op[1] = new(ctx) ir_constant(1);
1415 type = arithmetic_result_type(op[0], op[1], false, state, & loc);
1417 ir_rvalue *temp_rhs;
1418 temp_rhs = new(ctx) ir_expression(operations[this->oper], type,
1421 result = do_assignment(instructions, state,
1422 op[0]->clone(ctx, NULL), temp_rhs,
1423 this->subexpressions[0]->get_location());
1424 type = result->type;
1425 error_emitted = op[0]->type->is_error();
1430 case ast_post_dec: {
1431 op[0] = this->subexpressions[0]->hir(instructions, state);
1432 if (op[0]->type->base_type == GLSL_TYPE_FLOAT)
1433 op[1] = new(ctx) ir_constant(1.0f);
1435 op[1] = new(ctx) ir_constant(1);
1437 error_emitted = op[0]->type->is_error() || op[1]->type->is_error();
1439 type = arithmetic_result_type(op[0], op[1], false, state, & loc);
1441 ir_rvalue *temp_rhs;
1442 temp_rhs = new(ctx) ir_expression(operations[this->oper], type,
1445 /* Get a temporary of a copy of the lvalue before it's modified.
1446 * This may get thrown away later.
1448 result = get_lvalue_copy(instructions, op[0]->clone(ctx, NULL));
1450 (void)do_assignment(instructions, state,
1451 op[0]->clone(ctx, NULL), temp_rhs,
1452 this->subexpressions[0]->get_location());
1454 type = result->type;
1455 error_emitted = op[0]->type->is_error();
1459 case ast_field_selection:
1460 result = _mesa_ast_field_selection_to_hir(this, instructions, state);
1461 type = result->type;
1464 case ast_array_index: {
1465 YYLTYPE index_loc = subexpressions[1]->get_location();
1467 op[0] = subexpressions[0]->hir(instructions, state);
1468 op[1] = subexpressions[1]->hir(instructions, state);
1470 error_emitted = op[0]->type->is_error() || op[1]->type->is_error();
1472 ir_rvalue *const array = op[0];
1474 result = new(ctx) ir_dereference_array(op[0], op[1]);
1476 /* Do not use op[0] after this point. Use array.
1484 if (!array->type->is_array()
1485 && !array->type->is_matrix()
1486 && !array->type->is_vector()) {
1487 _mesa_glsl_error(& index_loc, state,
1488 "cannot dereference non-array / non-matrix / "
1490 error_emitted = true;
1493 if (!op[1]->type->is_integer()) {
1494 _mesa_glsl_error(& index_loc, state,
1495 "array index must be integer type");
1496 error_emitted = true;
1497 } else if (!op[1]->type->is_scalar()) {
1498 _mesa_glsl_error(& index_loc, state,
1499 "array index must be scalar");
1500 error_emitted = true;
1503 /* If the array index is a constant expression and the array has a
1504 * declared size, ensure that the access is in-bounds. If the array
1505 * index is not a constant expression, ensure that the array has a
1508 ir_constant *const const_index = op[1]->constant_expression_value();
1509 if (const_index != NULL) {
1510 const int idx = const_index->value.i[0];
1511 const char *type_name;
1514 if (array->type->is_matrix()) {
1515 type_name = "matrix";
1516 } else if (array->type->is_vector()) {
1517 type_name = "vector";
1519 type_name = "array";
1522 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec:
1524 * "It is illegal to declare an array with a size, and then
1525 * later (in the same shader) index the same array with an
1526 * integral constant expression greater than or equal to the
1527 * declared size. It is also illegal to index an array with a
1528 * negative constant expression."
1530 if (array->type->is_matrix()) {
1531 if (array->type->row_type()->vector_elements <= idx) {
1532 bound = array->type->row_type()->vector_elements;
1534 } else if (array->type->is_vector()) {
1535 if (array->type->vector_elements <= idx) {
1536 bound = array->type->vector_elements;
1539 if ((array->type->array_size() > 0)
1540 && (array->type->array_size() <= idx)) {
1541 bound = array->type->array_size();
1546 _mesa_glsl_error(& loc, state, "%s index must be < %u",
1548 error_emitted = true;
1549 } else if (idx < 0) {
1550 _mesa_glsl_error(& loc, state, "%s index must be >= 0",
1552 error_emitted = true;
1555 if (array->type->is_array()) {
1556 /* If the array is a variable dereference, it dereferences the
1557 * whole array, by definition. Use this to get the variable.
1559 * FINISHME: Should some methods for getting / setting / testing
1560 * FINISHME: array access limits be added to ir_dereference?
1562 ir_variable *const v = array->whole_variable_referenced();
1563 if ((v != NULL) && (unsigned(idx) > v->max_array_access))
1564 v->max_array_access = idx;
1566 } else if (array->type->array_size() == 0) {
1567 _mesa_glsl_error(&loc, state, "unsized array index must be constant");
1569 if (array->type->is_array()) {
1570 /* whole_variable_referenced can return NULL if the array is a
1571 * member of a structure. In this case it is safe to not update
1572 * the max_array_access field because it is never used for fields
1575 ir_variable *v = array->whole_variable_referenced();
1577 v->max_array_access = array->type->array_size();
1581 /* From page 23 (29 of the PDF) of the GLSL 1.30 spec:
1583 * "Samplers aggregated into arrays within a shader (using square
1584 * brackets [ ]) can only be indexed with integral constant
1585 * expressions [...]."
1587 * This restriction was added in GLSL 1.30. Shaders using earlier version
1588 * of the language should not be rejected by the compiler front-end for
1589 * using this construct. This allows useful things such as using a loop
1590 * counter as the index to an array of samplers. If the loop in unrolled,
1591 * the code should compile correctly. Instead, emit a warning.
1593 if (array->type->is_array() &&
1594 array->type->element_type()->is_sampler() &&
1595 const_index == NULL) {
1597 if (state->language_version == 100) {
1598 _mesa_glsl_warning(&loc, state,
1599 "sampler arrays indexed with non-constant "
1600 "expressions is optional in GLSL ES 1.00");
1601 } else if (state->language_version < 130) {
1602 _mesa_glsl_warning(&loc, state,
1603 "sampler arrays indexed with non-constant "
1604 "expressions is forbidden in GLSL 1.30 and "
1607 _mesa_glsl_error(&loc, state,
1608 "sampler arrays indexed with non-constant "
1609 "expressions is forbidden in GLSL 1.30 and "
1611 error_emitted = true;
1616 result->type = glsl_type::error_type;
1618 type = result->type;
1622 case ast_function_call:
1623 /* Should *NEVER* get here. ast_function_call should always be handled
1624 * by ast_function_expression::hir.
1629 case ast_identifier: {
1630 /* ast_identifier can appear several places in a full abstract syntax
1631 * tree. This particular use must be at location specified in the grammar
1632 * as 'variable_identifier'.
1635 state->symbols->get_variable(this->primary_expression.identifier);
1637 result = new(ctx) ir_dereference_variable(var);
1641 type = result->type;
1643 _mesa_glsl_error(& loc, state, "`%s' undeclared",
1644 this->primary_expression.identifier);
1646 error_emitted = true;
1651 case ast_int_constant:
1652 type = glsl_type::int_type;
1653 result = new(ctx) ir_constant(this->primary_expression.int_constant);
1656 case ast_uint_constant:
1657 type = glsl_type::uint_type;
1658 result = new(ctx) ir_constant(this->primary_expression.uint_constant);
1661 case ast_float_constant:
1662 type = glsl_type::float_type;
1663 result = new(ctx) ir_constant(this->primary_expression.float_constant);
1666 case ast_bool_constant:
1667 type = glsl_type::bool_type;
1668 result = new(ctx) ir_constant(bool(this->primary_expression.bool_constant));
1671 case ast_sequence: {
1672 /* It should not be possible to generate a sequence in the AST without
1673 * any expressions in it.
1675 assert(!this->expressions.is_empty());
1677 /* The r-value of a sequence is the last expression in the sequence. If
1678 * the other expressions in the sequence do not have side-effects (and
1679 * therefore add instructions to the instruction list), they get dropped
1682 foreach_list_typed (ast_node, ast, link, &this->expressions)
1683 result = ast->hir(instructions, state);
1685 type = result->type;
1687 /* Any errors should have already been emitted in the loop above.
1689 error_emitted = true;
1694 if (type->is_error() && !error_emitted)
1695 _mesa_glsl_error(& loc, state, "type mismatch");
1702 ast_expression_statement::hir(exec_list *instructions,
1703 struct _mesa_glsl_parse_state *state)
1705 /* It is possible to have expression statements that don't have an
1706 * expression. This is the solitary semicolon:
1708 * for (i = 0; i < 5; i++)
1711 * In this case the expression will be NULL. Test for NULL and don't do
1712 * anything in that case.
1714 if (expression != NULL)
1715 expression->hir(instructions, state);
1717 /* Statements do not have r-values.
1724 ast_compound_statement::hir(exec_list *instructions,
1725 struct _mesa_glsl_parse_state *state)
1728 state->symbols->push_scope();
1730 foreach_list_typed (ast_node, ast, link, &this->statements)
1731 ast->hir(instructions, state);
1734 state->symbols->pop_scope();
1736 /* Compound statements do not have r-values.
1742 static const glsl_type *
1743 process_array_type(YYLTYPE *loc, const glsl_type *base, ast_node *array_size,
1744 struct _mesa_glsl_parse_state *state)
1746 unsigned length = 0;
1748 /* FINISHME: Reject delcarations of multidimensional arrays. */
1750 if (array_size != NULL) {
1751 exec_list dummy_instructions;
1752 ir_rvalue *const ir = array_size->hir(& dummy_instructions, state);
1753 YYLTYPE loc = array_size->get_location();
1755 /* FINISHME: Verify that the grammar forbids side-effects in array
1756 * FINISHME: sizes. i.e., 'vec4 [x = 12] data'
1758 assert(dummy_instructions.is_empty());
1761 if (!ir->type->is_integer()) {
1762 _mesa_glsl_error(& loc, state, "array size must be integer type");
1763 } else if (!ir->type->is_scalar()) {
1764 _mesa_glsl_error(& loc, state, "array size must be scalar type");
1766 ir_constant *const size = ir->constant_expression_value();
1769 _mesa_glsl_error(& loc, state, "array size must be a "
1770 "constant valued expression");
1771 } else if (size->value.i[0] <= 0) {
1772 _mesa_glsl_error(& loc, state, "array size must be > 0");
1774 assert(size->type == ir->type);
1775 length = size->value.u[0];
1779 } else if (state->es_shader) {
1780 /* Section 10.17 of the GLSL ES 1.00 specification states that unsized
1781 * array declarations have been removed from the language.
1783 _mesa_glsl_error(loc, state, "unsized array declarations are not "
1784 "allowed in GLSL ES 1.00.");
1787 return glsl_type::get_array_instance(base, length);
1792 ast_type_specifier::glsl_type(const char **name,
1793 struct _mesa_glsl_parse_state *state) const
1795 const struct glsl_type *type;
1797 type = state->symbols->get_type(this->type_name);
1798 *name = this->type_name;
1800 if (this->is_array) {
1801 YYLTYPE loc = this->get_location();
1802 type = process_array_type(&loc, type, this->array_size, state);
1810 apply_type_qualifier_to_variable(const struct ast_type_qualifier *qual,
1812 struct _mesa_glsl_parse_state *state,
1815 if (qual->flags.q.invariant) {
1817 _mesa_glsl_error(loc, state,
1818 "variable `%s' may not be redeclared "
1819 "`invariant' after being used",
1826 if (qual->flags.q.constant || qual->flags.q.attribute
1827 || qual->flags.q.uniform
1828 || (qual->flags.q.varying && (state->target == fragment_shader)))
1831 if (qual->flags.q.centroid)
1834 if (qual->flags.q.attribute && state->target != vertex_shader) {
1835 var->type = glsl_type::error_type;
1836 _mesa_glsl_error(loc, state,
1837 "`attribute' variables may not be declared in the "
1839 _mesa_glsl_shader_target_name(state->target));
1842 /* From page 25 (page 31 of the PDF) of the GLSL 1.10 spec:
1844 * "The varying qualifier can be used only with the data types
1845 * float, vec2, vec3, vec4, mat2, mat3, and mat4, or arrays of
1848 if (qual->flags.q.varying) {
1849 const glsl_type *non_array_type;
1851 if (var->type && var->type->is_array())
1852 non_array_type = var->type->fields.array;
1854 non_array_type = var->type;
1856 if (non_array_type && non_array_type->base_type != GLSL_TYPE_FLOAT) {
1857 var->type = glsl_type::error_type;
1858 _mesa_glsl_error(loc, state,
1859 "varying variables must be of base type float");
1863 /* If there is no qualifier that changes the mode of the variable, leave
1864 * the setting alone.
1866 if (qual->flags.q.in && qual->flags.q.out)
1867 var->mode = ir_var_inout;
1868 else if (qual->flags.q.attribute || qual->flags.q.in
1869 || (qual->flags.q.varying && (state->target == fragment_shader)))
1870 var->mode = ir_var_in;
1871 else if (qual->flags.q.out
1872 || (qual->flags.q.varying && (state->target == vertex_shader)))
1873 var->mode = ir_var_out;
1874 else if (qual->flags.q.uniform)
1875 var->mode = ir_var_uniform;
1877 if (state->all_invariant && (state->current_function == NULL)) {
1878 switch (state->target) {
1880 if (var->mode == ir_var_out)
1881 var->invariant = true;
1883 case geometry_shader:
1884 if ((var->mode == ir_var_in) || (var->mode == ir_var_out))
1885 var->invariant = true;
1887 case fragment_shader:
1888 if (var->mode == ir_var_in)
1889 var->invariant = true;
1894 if (qual->flags.q.flat)
1895 var->interpolation = ir_var_flat;
1896 else if (qual->flags.q.noperspective)
1897 var->interpolation = ir_var_noperspective;
1899 var->interpolation = ir_var_smooth;
1901 var->pixel_center_integer = qual->flags.q.pixel_center_integer;
1902 var->origin_upper_left = qual->flags.q.origin_upper_left;
1903 if ((qual->flags.q.origin_upper_left || qual->flags.q.pixel_center_integer)
1904 && (strcmp(var->name, "gl_FragCoord") != 0)) {
1905 const char *const qual_string = (qual->flags.q.origin_upper_left)
1906 ? "origin_upper_left" : "pixel_center_integer";
1908 _mesa_glsl_error(loc, state,
1909 "layout qualifier `%s' can only be applied to "
1910 "fragment shader input `gl_FragCoord'",
1914 if (qual->flags.q.explicit_location) {
1915 const bool global_scope = (state->current_function == NULL);
1917 const char *string = "";
1919 /* In the vertex shader only shader inputs can be given explicit
1922 * In the fragment shader only shader outputs can be given explicit
1925 switch (state->target) {
1927 if (!global_scope || (var->mode != ir_var_in)) {
1933 case geometry_shader:
1934 _mesa_glsl_error(loc, state,
1935 "geometry shader variables cannot be given "
1936 "explicit locations\n");
1939 case fragment_shader:
1940 if (!global_scope || (var->mode != ir_var_in)) {
1948 _mesa_glsl_error(loc, state,
1949 "only %s shader %s variables can be given an "
1950 "explicit location\n",
1951 _mesa_glsl_shader_target_name(state->target),
1954 var->explicit_location = true;
1956 /* This bit of silliness is needed because invalid explicit locations
1957 * are supposed to be flagged during linking. Small negative values
1958 * biased by VERT_ATTRIB_GENERIC0 or FRAG_RESULT_DATA0 could alias
1959 * built-in values (e.g., -16+VERT_ATTRIB_GENERIC0 = VERT_ATTRIB_POS).
1960 * The linker needs to be able to differentiate these cases. This
1961 * ensures that negative values stay negative.
1963 if (qual->location >= 0) {
1964 var->location = (state->target == vertex_shader)
1965 ? (qual->location + VERT_ATTRIB_GENERIC0)
1966 : (qual->location + FRAG_RESULT_DATA0);
1968 var->location = qual->location;
1973 /* Does the declaration use the 'layout' keyword?
1975 const bool uses_layout = qual->flags.q.pixel_center_integer
1976 || qual->flags.q.origin_upper_left
1977 || qual->flags.q.explicit_location;
1979 /* Does the declaration use the deprecated 'attribute' or 'varying'
1982 const bool uses_deprecated_qualifier = qual->flags.q.attribute
1983 || qual->flags.q.varying;
1985 /* Is the 'layout' keyword used with parameters that allow relaxed checking.
1986 * Many implementations of GL_ARB_fragment_coord_conventions_enable and some
1987 * implementations (only Mesa?) GL_ARB_explicit_attrib_location_enable
1988 * allowed the layout qualifier to be used with 'varying' and 'attribute'.
1989 * These extensions and all following extensions that add the 'layout'
1990 * keyword have been modified to require the use of 'in' or 'out'.
1992 * The following extension do not allow the deprecated keywords:
1994 * GL_AMD_conservative_depth
1995 * GL_ARB_gpu_shader5
1996 * GL_ARB_separate_shader_objects
1997 * GL_ARB_tesselation_shader
1998 * GL_ARB_transform_feedback3
1999 * GL_ARB_uniform_buffer_object
2001 * It is unknown whether GL_EXT_shader_image_load_store or GL_NV_gpu_shader5
2002 * allow layout with the deprecated keywords.
2004 const bool relaxed_layout_qualifier_checking =
2005 state->ARB_fragment_coord_conventions_enable;
2007 if (uses_layout && uses_deprecated_qualifier) {
2008 if (relaxed_layout_qualifier_checking) {
2009 _mesa_glsl_warning(loc, state,
2010 "`layout' qualifier may not be used with "
2011 "`attribute' or `varying'");
2013 _mesa_glsl_error(loc, state,
2014 "`layout' qualifier may not be used with "
2015 "`attribute' or `varying'");
2019 /* Layout qualifiers for gl_FragDepth, which are enabled by extension
2020 * AMD_conservative_depth.
2022 int depth_layout_count = qual->flags.q.depth_any
2023 + qual->flags.q.depth_greater
2024 + qual->flags.q.depth_less
2025 + qual->flags.q.depth_unchanged;
2026 if (depth_layout_count > 0
2027 && !state->AMD_conservative_depth_enable) {
2028 _mesa_glsl_error(loc, state,
2029 "extension GL_AMD_conservative_depth must be enabled "
2030 "to use depth layout qualifiers");
2031 } else if (depth_layout_count > 0
2032 && strcmp(var->name, "gl_FragDepth") != 0) {
2033 _mesa_glsl_error(loc, state,
2034 "depth layout qualifiers can be applied only to "
2036 } else if (depth_layout_count > 1
2037 && strcmp(var->name, "gl_FragDepth") == 0) {
2038 _mesa_glsl_error(loc, state,
2039 "at most one depth layout qualifier can be applied to "
2042 if (qual->flags.q.depth_any)
2043 var->depth_layout = ir_depth_layout_any;
2044 else if (qual->flags.q.depth_greater)
2045 var->depth_layout = ir_depth_layout_greater;
2046 else if (qual->flags.q.depth_less)
2047 var->depth_layout = ir_depth_layout_less;
2048 else if (qual->flags.q.depth_unchanged)
2049 var->depth_layout = ir_depth_layout_unchanged;
2051 var->depth_layout = ir_depth_layout_none;
2053 if (var->type->is_array() && state->language_version != 110) {
2054 var->array_lvalue = true;
2060 ast_declarator_list::hir(exec_list *instructions,
2061 struct _mesa_glsl_parse_state *state)
2064 const struct glsl_type *decl_type;
2065 const char *type_name = NULL;
2066 ir_rvalue *result = NULL;
2067 YYLTYPE loc = this->get_location();
2069 /* From page 46 (page 52 of the PDF) of the GLSL 1.50 spec:
2071 * "To ensure that a particular output variable is invariant, it is
2072 * necessary to use the invariant qualifier. It can either be used to
2073 * qualify a previously declared variable as being invariant
2075 * invariant gl_Position; // make existing gl_Position be invariant"
2077 * In these cases the parser will set the 'invariant' flag in the declarator
2078 * list, and the type will be NULL.
2080 if (this->invariant) {
2081 assert(this->type == NULL);
2083 if (state->current_function != NULL) {
2084 _mesa_glsl_error(& loc, state,
2085 "All uses of `invariant' keyword must be at global "
2089 foreach_list_typed (ast_declaration, decl, link, &this->declarations) {
2090 assert(!decl->is_array);
2091 assert(decl->array_size == NULL);
2092 assert(decl->initializer == NULL);
2094 ir_variable *const earlier =
2095 state->symbols->get_variable(decl->identifier);
2096 if (earlier == NULL) {
2097 _mesa_glsl_error(& loc, state,
2098 "Undeclared variable `%s' cannot be marked "
2099 "invariant\n", decl->identifier);
2100 } else if ((state->target == vertex_shader)
2101 && (earlier->mode != ir_var_out)) {
2102 _mesa_glsl_error(& loc, state,
2103 "`%s' cannot be marked invariant, vertex shader "
2104 "outputs only\n", decl->identifier);
2105 } else if ((state->target == fragment_shader)
2106 && (earlier->mode != ir_var_in)) {
2107 _mesa_glsl_error(& loc, state,
2108 "`%s' cannot be marked invariant, fragment shader "
2109 "inputs only\n", decl->identifier);
2110 } else if (earlier->used) {
2111 _mesa_glsl_error(& loc, state,
2112 "variable `%s' may not be redeclared "
2113 "`invariant' after being used",
2116 earlier->invariant = true;
2120 /* Invariant redeclarations do not have r-values.
2125 assert(this->type != NULL);
2126 assert(!this->invariant);
2128 /* The type specifier may contain a structure definition. Process that
2129 * before any of the variable declarations.
2131 (void) this->type->specifier->hir(instructions, state);
2133 decl_type = this->type->specifier->glsl_type(& type_name, state);
2134 if (this->declarations.is_empty()) {
2135 /* The only valid case where the declaration list can be empty is when
2136 * the declaration is setting the default precision of a built-in type
2137 * (e.g., 'precision highp vec4;').
2140 if (decl_type != NULL) {
2142 _mesa_glsl_error(& loc, state, "incomplete declaration");
2146 foreach_list_typed (ast_declaration, decl, link, &this->declarations) {
2147 const struct glsl_type *var_type;
2150 /* FINISHME: Emit a warning if a variable declaration shadows a
2151 * FINISHME: declaration at a higher scope.
2154 if ((decl_type == NULL) || decl_type->is_void()) {
2155 if (type_name != NULL) {
2156 _mesa_glsl_error(& loc, state,
2157 "invalid type `%s' in declaration of `%s'",
2158 type_name, decl->identifier);
2160 _mesa_glsl_error(& loc, state,
2161 "invalid type in declaration of `%s'",
2167 if (decl->is_array) {
2168 var_type = process_array_type(&loc, decl_type, decl->array_size,
2171 var_type = decl_type;
2174 var = new(ctx) ir_variable(var_type, decl->identifier, ir_var_auto);
2176 /* From page 22 (page 28 of the PDF) of the GLSL 1.10 specification;
2178 * "Global variables can only use the qualifiers const,
2179 * attribute, uni form, or varying. Only one may be
2182 * Local variables can only use the qualifier const."
2184 * This is relaxed in GLSL 1.30. It is also relaxed by any extension
2185 * that adds the 'layout' keyword.
2187 if ((state->language_version < 130)
2188 && !state->ARB_explicit_attrib_location_enable
2189 && !state->ARB_fragment_coord_conventions_enable) {
2190 if (this->type->qualifier.flags.q.out) {
2191 _mesa_glsl_error(& loc, state,
2192 "`out' qualifier in declaration of `%s' "
2193 "only valid for function parameters in %s.",
2194 decl->identifier, state->version_string);
2196 if (this->type->qualifier.flags.q.in) {
2197 _mesa_glsl_error(& loc, state,
2198 "`in' qualifier in declaration of `%s' "
2199 "only valid for function parameters in %s.",
2200 decl->identifier, state->version_string);
2202 /* FINISHME: Test for other invalid qualifiers. */
2205 apply_type_qualifier_to_variable(& this->type->qualifier, var, state,
2208 if (this->type->qualifier.flags.q.invariant) {
2209 if ((state->target == vertex_shader) && !(var->mode == ir_var_out ||
2210 var->mode == ir_var_inout)) {
2211 /* FINISHME: Note that this doesn't work for invariant on
2212 * a function signature outval
2214 _mesa_glsl_error(& loc, state,
2215 "`%s' cannot be marked invariant, vertex shader "
2216 "outputs only\n", var->name);
2217 } else if ((state->target == fragment_shader) &&
2218 !(var->mode == ir_var_in || var->mode == ir_var_inout)) {
2219 /* FINISHME: Note that this doesn't work for invariant on
2220 * a function signature inval
2222 _mesa_glsl_error(& loc, state,
2223 "`%s' cannot be marked invariant, fragment shader "
2224 "inputs only\n", var->name);
2228 if (state->current_function != NULL) {
2229 const char *mode = NULL;
2230 const char *extra = "";
2232 /* There is no need to check for 'inout' here because the parser will
2233 * only allow that in function parameter lists.
2235 if (this->type->qualifier.flags.q.attribute) {
2237 } else if (this->type->qualifier.flags.q.uniform) {
2239 } else if (this->type->qualifier.flags.q.varying) {
2241 } else if (this->type->qualifier.flags.q.in) {
2243 extra = " or in function parameter list";
2244 } else if (this->type->qualifier.flags.q.out) {
2246 extra = " or in function parameter list";
2250 _mesa_glsl_error(& loc, state,
2251 "%s variable `%s' must be declared at "
2253 mode, var->name, extra);
2255 } else if (var->mode == ir_var_in) {
2256 var->read_only = true;
2258 if (state->target == vertex_shader) {
2259 bool error_emitted = false;
2261 /* From page 31 (page 37 of the PDF) of the GLSL 1.50 spec:
2263 * "Vertex shader inputs can only be float, floating-point
2264 * vectors, matrices, signed and unsigned integers and integer
2265 * vectors. Vertex shader inputs can also form arrays of these
2266 * types, but not structures."
2268 * From page 31 (page 27 of the PDF) of the GLSL 1.30 spec:
2270 * "Vertex shader inputs can only be float, floating-point
2271 * vectors, matrices, signed and unsigned integers and integer
2272 * vectors. They cannot be arrays or structures."
2274 * From page 23 (page 29 of the PDF) of the GLSL 1.20 spec:
2276 * "The attribute qualifier can be used only with float,
2277 * floating-point vectors, and matrices. Attribute variables
2278 * cannot be declared as arrays or structures."
2280 const glsl_type *check_type = var->type->is_array()
2281 ? var->type->fields.array : var->type;
2283 switch (check_type->base_type) {
2284 case GLSL_TYPE_FLOAT:
2286 case GLSL_TYPE_UINT:
2288 if (state->language_version > 120)
2292 _mesa_glsl_error(& loc, state,
2293 "vertex shader input / attribute cannot have "
2295 var->type->is_array() ? "array of " : "",
2297 error_emitted = true;
2300 if (!error_emitted && (state->language_version <= 130)
2301 && var->type->is_array()) {
2302 _mesa_glsl_error(& loc, state,
2303 "vertex shader input / attribute cannot have "
2305 error_emitted = true;
2310 /* Integer vertex outputs must be qualified with 'flat'.
2312 * From section 4.3.6 of the GLSL 1.30 spec:
2313 * "If a vertex output is a signed or unsigned integer or integer
2314 * vector, then it must be qualified with the interpolation qualifier
2317 if (state->language_version >= 130
2318 && state->target == vertex_shader
2319 && state->current_function == NULL
2320 && var->type->is_integer()
2321 && var->mode == ir_var_out
2322 && var->interpolation != ir_var_flat) {
2324 _mesa_glsl_error(&loc, state, "If a vertex output is an integer, "
2325 "then it must be qualified with 'flat'");
2329 /* Interpolation qualifiers cannot be applied to 'centroid' and
2330 * 'centroid varying'.
2332 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
2333 * "interpolation qualifiers may only precede the qualifiers in,
2334 * centroid in, out, or centroid out in a declaration. They do not apply
2335 * to the deprecated storage qualifiers varying or centroid varying."
2337 if (state->language_version >= 130
2338 && this->type->qualifier.has_interpolation()
2339 && this->type->qualifier.flags.q.varying) {
2341 const char *i = this->type->qualifier.interpolation_string();
2344 if (this->type->qualifier.flags.q.centroid)
2345 s = "centroid varying";
2349 _mesa_glsl_error(&loc, state,
2350 "qualifier '%s' cannot be applied to the "
2351 "deprecated storage qualifier '%s'", i, s);
2355 /* Interpolation qualifiers can only apply to vertex shader outputs and
2356 * fragment shader inputs.
2358 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
2359 * "Outputs from a vertex shader (out) and inputs to a fragment
2360 * shader (in) can be further qualified with one or more of these
2361 * interpolation qualifiers"
2363 if (state->language_version >= 130
2364 && this->type->qualifier.has_interpolation()) {
2366 const char *i = this->type->qualifier.interpolation_string();
2369 switch (state->target) {
2371 if (this->type->qualifier.flags.q.in) {
2372 _mesa_glsl_error(&loc, state,
2373 "qualifier '%s' cannot be applied to vertex "
2374 "shader inputs", i);
2377 case fragment_shader:
2378 if (this->type->qualifier.flags.q.out) {
2379 _mesa_glsl_error(&loc, state,
2380 "qualifier '%s' cannot be applied to fragment "
2381 "shader outputs", i);
2390 /* From section 4.3.4 of the GLSL 1.30 spec:
2391 * "It is an error to use centroid in in a vertex shader."
2393 if (state->language_version >= 130
2394 && this->type->qualifier.flags.q.centroid
2395 && this->type->qualifier.flags.q.in
2396 && state->target == vertex_shader) {
2398 _mesa_glsl_error(&loc, state,
2399 "'centroid in' cannot be used in a vertex shader");
2403 /* Precision qualifiers exists only in GLSL versions 1.00 and >= 1.30.
2405 if (this->type->specifier->precision != ast_precision_none
2406 && state->language_version != 100
2407 && state->language_version < 130) {
2409 _mesa_glsl_error(&loc, state,
2410 "precision qualifiers are supported only in GLSL ES "
2411 "1.00, and GLSL 1.30 and later");
2415 /* Precision qualifiers only apply to floating point and integer types.
2417 * From section 4.5.2 of the GLSL 1.30 spec:
2418 * "Any floating point or any integer declaration can have the type
2419 * preceded by one of these precision qualifiers [...] Literal
2420 * constants do not have precision qualifiers. Neither do Boolean
2423 if (this->type->specifier->precision != ast_precision_none
2424 && !var->type->is_float()
2425 && !var->type->is_integer()
2426 && !(var->type->is_array()
2427 && (var->type->fields.array->is_float()
2428 || var->type->fields.array->is_integer()))) {
2430 _mesa_glsl_error(&loc, state,
2431 "precision qualifiers apply only to floating point "
2432 "and integer types");
2435 /* Process the initializer and add its instructions to a temporary
2436 * list. This list will be added to the instruction stream (below) after
2437 * the declaration is added. This is done because in some cases (such as
2438 * redeclarations) the declaration may not actually be added to the
2439 * instruction stream.
2441 exec_list initializer_instructions;
2442 if (decl->initializer != NULL) {
2443 YYLTYPE initializer_loc = decl->initializer->get_location();
2445 /* From page 24 (page 30 of the PDF) of the GLSL 1.10 spec:
2447 * "All uniform variables are read-only and are initialized either
2448 * directly by an application via API commands, or indirectly by
2451 if ((state->language_version <= 110)
2452 && (var->mode == ir_var_uniform)) {
2453 _mesa_glsl_error(& initializer_loc, state,
2454 "cannot initialize uniforms in GLSL 1.10");
2457 if (var->type->is_sampler()) {
2458 _mesa_glsl_error(& initializer_loc, state,
2459 "cannot initialize samplers");
2462 if ((var->mode == ir_var_in) && (state->current_function == NULL)) {
2463 _mesa_glsl_error(& initializer_loc, state,
2464 "cannot initialize %s shader input / %s",
2465 _mesa_glsl_shader_target_name(state->target),
2466 (state->target == vertex_shader)
2467 ? "attribute" : "varying");
2470 ir_dereference *const lhs = new(ctx) ir_dereference_variable(var);
2471 ir_rvalue *rhs = decl->initializer->hir(&initializer_instructions,
2474 /* Calculate the constant value if this is a const or uniform
2477 if (this->type->qualifier.flags.q.constant
2478 || this->type->qualifier.flags.q.uniform) {
2479 ir_rvalue *new_rhs = validate_assignment(state, var->type, rhs);
2480 if (new_rhs != NULL) {
2483 ir_constant *constant_value = rhs->constant_expression_value();
2484 if (!constant_value) {
2485 _mesa_glsl_error(& initializer_loc, state,
2486 "initializer of %s variable `%s' must be a "
2487 "constant expression",
2488 (this->type->qualifier.flags.q.constant)
2489 ? "const" : "uniform",
2491 if (var->type->is_numeric()) {
2492 /* Reduce cascading errors. */
2493 var->constant_value = ir_constant::zero(ctx, var->type);
2496 rhs = constant_value;
2497 var->constant_value = constant_value;
2500 _mesa_glsl_error(&initializer_loc, state,
2501 "initializer of type %s cannot be assigned to "
2502 "variable of type %s",
2503 rhs->type->name, var->type->name);
2504 if (var->type->is_numeric()) {
2505 /* Reduce cascading errors. */
2506 var->constant_value = ir_constant::zero(ctx, var->type);
2511 if (rhs && !rhs->type->is_error()) {
2512 bool temp = var->read_only;
2513 if (this->type->qualifier.flags.q.constant)
2514 var->read_only = false;
2516 /* Never emit code to initialize a uniform.
2518 const glsl_type *initializer_type;
2519 if (!this->type->qualifier.flags.q.uniform) {
2520 result = do_assignment(&initializer_instructions, state,
2522 this->get_location());
2523 initializer_type = result->type;
2525 initializer_type = rhs->type;
2527 /* If the declared variable is an unsized array, it must inherrit
2528 * its full type from the initializer. A declaration such as
2530 * uniform float a[] = float[](1.0, 2.0, 3.0, 3.0);
2534 * uniform float a[4] = float[](1.0, 2.0, 3.0, 3.0);
2536 * The assignment generated in the if-statement (below) will also
2537 * automatically handle this case for non-uniforms.
2539 * If the declared variable is not an array, the types must
2540 * already match exactly. As a result, the type assignment
2541 * here can be done unconditionally. For non-uniforms the call
2542 * to do_assignment can change the type of the initializer (via
2543 * the implicit conversion rules). For uniforms the initializer
2544 * must be a constant expression, and the type of that expression
2545 * was validated above.
2547 var->type = initializer_type;
2549 var->read_only = temp;
2553 /* From page 23 (page 29 of the PDF) of the GLSL 1.10 spec:
2555 * "It is an error to write to a const variable outside of
2556 * its declaration, so they must be initialized when
2559 if (this->type->qualifier.flags.q.constant && decl->initializer == NULL) {
2560 _mesa_glsl_error(& loc, state,
2561 "const declaration of `%s' must be initialized",
2565 /* Check if this declaration is actually a re-declaration, either to
2566 * resize an array or add qualifiers to an existing variable.
2568 * This is allowed for variables in the current scope, or when at
2569 * global scope (for built-ins in the implicit outer scope).
2571 ir_variable *earlier = state->symbols->get_variable(decl->identifier);
2572 if (earlier != NULL && (state->current_function == NULL ||
2573 state->symbols->name_declared_this_scope(decl->identifier))) {
2575 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec,
2577 * "It is legal to declare an array without a size and then
2578 * later re-declare the same name as an array of the same
2579 * type and specify a size."
2581 if ((earlier->type->array_size() == 0)
2582 && var->type->is_array()
2583 && (var->type->element_type() == earlier->type->element_type())) {
2584 /* FINISHME: This doesn't match the qualifiers on the two
2585 * FINISHME: declarations. It's not 100% clear whether this is
2586 * FINISHME: required or not.
2589 /* From page 54 (page 60 of the PDF) of the GLSL 1.20 spec:
2591 * "The size [of gl_TexCoord] can be at most
2592 * gl_MaxTextureCoords."
2594 const unsigned size = unsigned(var->type->array_size());
2595 if ((strcmp("gl_TexCoord", var->name) == 0)
2596 && (size > state->Const.MaxTextureCoords)) {
2597 YYLTYPE loc = this->get_location();
2599 _mesa_glsl_error(& loc, state, "`gl_TexCoord' array size cannot "
2600 "be larger than gl_MaxTextureCoords (%u)\n",
2601 state->Const.MaxTextureCoords);
2602 } else if ((size > 0) && (size <= earlier->max_array_access)) {
2603 YYLTYPE loc = this->get_location();
2605 _mesa_glsl_error(& loc, state, "array size must be > %u due to "
2607 earlier->max_array_access);
2610 earlier->type = var->type;
2613 } else if (state->ARB_fragment_coord_conventions_enable
2614 && strcmp(var->name, "gl_FragCoord") == 0
2615 && earlier->type == var->type
2616 && earlier->mode == var->mode) {
2617 /* Allow redeclaration of gl_FragCoord for ARB_fcc layout
2620 earlier->origin_upper_left = var->origin_upper_left;
2621 earlier->pixel_center_integer = var->pixel_center_integer;
2623 /* According to section 4.3.7 of the GLSL 1.30 spec,
2624 * the following built-in varaibles can be redeclared with an
2625 * interpolation qualifier:
2628 * * gl_FrontSecondaryColor
2629 * * gl_BackSecondaryColor
2631 * * gl_SecondaryColor
2633 } else if (state->language_version >= 130
2634 && (strcmp(var->name, "gl_FrontColor") == 0
2635 || strcmp(var->name, "gl_BackColor") == 0
2636 || strcmp(var->name, "gl_FrontSecondaryColor") == 0
2637 || strcmp(var->name, "gl_BackSecondaryColor") == 0
2638 || strcmp(var->name, "gl_Color") == 0
2639 || strcmp(var->name, "gl_SecondaryColor") == 0)
2640 && earlier->type == var->type
2641 && earlier->mode == var->mode) {
2642 earlier->interpolation = var->interpolation;
2644 /* Layout qualifiers for gl_FragDepth. */
2645 } else if (state->AMD_conservative_depth_enable
2646 && strcmp(var->name, "gl_FragDepth") == 0
2647 && earlier->type == var->type
2648 && earlier->mode == var->mode) {
2650 /** From the AMD_conservative_depth spec:
2651 * Within any shader, the first redeclarations of gl_FragDepth
2652 * must appear before any use of gl_FragDepth.
2654 if (earlier->used) {
2655 _mesa_glsl_error(&loc, state,
2656 "the first redeclaration of gl_FragDepth "
2657 "must appear before any use of gl_FragDepth");
2660 /* Prevent inconsistent redeclaration of depth layout qualifier. */
2661 if (earlier->depth_layout != ir_depth_layout_none
2662 && earlier->depth_layout != var->depth_layout) {
2663 _mesa_glsl_error(&loc, state,
2664 "gl_FragDepth: depth layout is declared here "
2665 "as '%s, but it was previously declared as "
2667 depth_layout_string(var->depth_layout),
2668 depth_layout_string(earlier->depth_layout));
2671 earlier->depth_layout = var->depth_layout;
2674 YYLTYPE loc = this->get_location();
2675 _mesa_glsl_error(&loc, state, "`%s' redeclared", decl->identifier);
2681 /* By now, we know it's a new variable declaration (we didn't hit the
2682 * above "continue").
2684 * From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
2686 * "Identifiers starting with "gl_" are reserved for use by
2687 * OpenGL, and may not be declared in a shader as either a
2688 * variable or a function."
2690 if (strncmp(decl->identifier, "gl_", 3) == 0)
2691 _mesa_glsl_error(& loc, state,
2692 "identifier `%s' uses reserved `gl_' prefix",
2695 /* Add the variable to the symbol table. Note that the initializer's
2696 * IR was already processed earlier (though it hasn't been emitted yet),
2697 * without the variable in scope.
2699 * This differs from most C-like languages, but it follows the GLSL
2700 * specification. From page 28 (page 34 of the PDF) of the GLSL 1.50
2703 * "Within a declaration, the scope of a name starts immediately
2704 * after the initializer if present or immediately after the name
2705 * being declared if not."
2707 if (!state->symbols->add_variable(var)) {
2708 YYLTYPE loc = this->get_location();
2709 _mesa_glsl_error(&loc, state, "name `%s' already taken in the "
2710 "current scope", decl->identifier);
2714 /* Push the variable declaration to the top. It means that all
2715 * the variable declarations will appear in a funny
2716 * last-to-first order, but otherwise we run into trouble if a
2717 * function is prototyped, a global var is decled, then the
2718 * function is defined with usage of the global var. See
2719 * glslparsertest's CorrectModule.frag.
2721 instructions->push_head(var);
2722 instructions->append_list(&initializer_instructions);
2726 /* Generally, variable declarations do not have r-values. However,
2727 * one is used for the declaration in
2729 * while (bool b = some_condition()) {
2733 * so we return the rvalue from the last seen declaration here.
2740 ast_parameter_declarator::hir(exec_list *instructions,
2741 struct _mesa_glsl_parse_state *state)
2744 const struct glsl_type *type;
2745 const char *name = NULL;
2746 YYLTYPE loc = this->get_location();
2748 type = this->type->specifier->glsl_type(& name, state);
2752 _mesa_glsl_error(& loc, state,
2753 "invalid type `%s' in declaration of `%s'",
2754 name, this->identifier);
2756 _mesa_glsl_error(& loc, state,
2757 "invalid type in declaration of `%s'",
2761 type = glsl_type::error_type;
2764 /* From page 62 (page 68 of the PDF) of the GLSL 1.50 spec:
2766 * "Functions that accept no input arguments need not use void in the
2767 * argument list because prototypes (or definitions) are required and
2768 * therefore there is no ambiguity when an empty argument list "( )" is
2769 * declared. The idiom "(void)" as a parameter list is provided for
2772 * Placing this check here prevents a void parameter being set up
2773 * for a function, which avoids tripping up checks for main taking
2774 * parameters and lookups of an unnamed symbol.
2776 if (type->is_void()) {
2777 if (this->identifier != NULL)
2778 _mesa_glsl_error(& loc, state,
2779 "named parameter cannot have type `void'");
2785 if (formal_parameter && (this->identifier == NULL)) {
2786 _mesa_glsl_error(& loc, state, "formal parameter lacks a name");
2790 /* This only handles "vec4 foo[..]". The earlier specifier->glsl_type(...)
2791 * call already handled the "vec4[..] foo" case.
2793 if (this->is_array) {
2794 type = process_array_type(&loc, type, this->array_size, state);
2797 if (type->array_size() == 0) {
2798 _mesa_glsl_error(&loc, state, "arrays passed as parameters must have "
2799 "a declared size.");
2800 type = glsl_type::error_type;
2804 ir_variable *var = new(ctx) ir_variable(type, this->identifier, ir_var_in);
2806 /* Apply any specified qualifiers to the parameter declaration. Note that
2807 * for function parameters the default mode is 'in'.
2809 apply_type_qualifier_to_variable(& this->type->qualifier, var, state, & loc);
2811 instructions->push_tail(var);
2813 /* Parameter declarations do not have r-values.
2820 ast_parameter_declarator::parameters_to_hir(exec_list *ast_parameters,
2822 exec_list *ir_parameters,
2823 _mesa_glsl_parse_state *state)
2825 ast_parameter_declarator *void_param = NULL;
2828 foreach_list_typed (ast_parameter_declarator, param, link, ast_parameters) {
2829 param->formal_parameter = formal;
2830 param->hir(ir_parameters, state);
2838 if ((void_param != NULL) && (count > 1)) {
2839 YYLTYPE loc = void_param->get_location();
2841 _mesa_glsl_error(& loc, state,
2842 "`void' parameter must be only parameter");
2848 emit_function(_mesa_glsl_parse_state *state, exec_list *instructions,
2851 /* Emit the new function header */
2852 if (state->current_function == NULL) {
2853 instructions->push_tail(f);
2855 /* IR invariants disallow function declarations or definitions nested
2856 * within other function definitions. Insert the new ir_function
2857 * block in the instruction sequence before the ir_function block
2858 * containing the current ir_function_signature.
2860 ir_function *const curr =
2861 const_cast<ir_function *>(state->current_function->function());
2863 curr->insert_before(f);
2869 ast_function::hir(exec_list *instructions,
2870 struct _mesa_glsl_parse_state *state)
2873 ir_function *f = NULL;
2874 ir_function_signature *sig = NULL;
2875 exec_list hir_parameters;
2877 const char *const name = identifier;
2879 /* From page 21 (page 27 of the PDF) of the GLSL 1.20 spec,
2881 * "Function declarations (prototypes) cannot occur inside of functions;
2882 * they must be at global scope, or for the built-in functions, outside
2883 * the global scope."
2885 * From page 27 (page 33 of the PDF) of the GLSL ES 1.00.16 spec,
2887 * "User defined functions may only be defined within the global scope."
2889 * Note that this language does not appear in GLSL 1.10.
2891 if ((state->current_function != NULL) && (state->language_version != 110)) {
2892 YYLTYPE loc = this->get_location();
2893 _mesa_glsl_error(&loc, state,
2894 "declaration of function `%s' not allowed within "
2895 "function body", name);
2898 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
2900 * "Identifiers starting with "gl_" are reserved for use by
2901 * OpenGL, and may not be declared in a shader as either a
2902 * variable or a function."
2904 if (strncmp(name, "gl_", 3) == 0) {
2905 YYLTYPE loc = this->get_location();
2906 _mesa_glsl_error(&loc, state,
2907 "identifier `%s' uses reserved `gl_' prefix", name);
2910 /* Convert the list of function parameters to HIR now so that they can be
2911 * used below to compare this function's signature with previously seen
2912 * signatures for functions with the same name.
2914 ast_parameter_declarator::parameters_to_hir(& this->parameters,
2916 & hir_parameters, state);
2918 const char *return_type_name;
2919 const glsl_type *return_type =
2920 this->return_type->specifier->glsl_type(& return_type_name, state);
2923 YYLTYPE loc = this->get_location();
2924 _mesa_glsl_error(&loc, state,
2925 "function `%s' has undeclared return type `%s'",
2926 name, return_type_name);
2927 return_type = glsl_type::error_type;
2930 /* From page 56 (page 62 of the PDF) of the GLSL 1.30 spec:
2931 * "No qualifier is allowed on the return type of a function."
2933 if (this->return_type->has_qualifiers()) {
2934 YYLTYPE loc = this->get_location();
2935 _mesa_glsl_error(& loc, state,
2936 "function `%s' return type has qualifiers", name);
2939 /* Verify that this function's signature either doesn't match a previously
2940 * seen signature for a function with the same name, or, if a match is found,
2941 * that the previously seen signature does not have an associated definition.
2943 f = state->symbols->get_function(name);
2944 if (f != NULL && (state->es_shader || f->has_user_signature())) {
2945 sig = f->exact_matching_signature(&hir_parameters);
2947 const char *badvar = sig->qualifiers_match(&hir_parameters);
2948 if (badvar != NULL) {
2949 YYLTYPE loc = this->get_location();
2951 _mesa_glsl_error(&loc, state, "function `%s' parameter `%s' "
2952 "qualifiers don't match prototype", name, badvar);
2955 if (sig->return_type != return_type) {
2956 YYLTYPE loc = this->get_location();
2958 _mesa_glsl_error(&loc, state, "function `%s' return type doesn't "
2959 "match prototype", name);
2962 if (is_definition && sig->is_defined) {
2963 YYLTYPE loc = this->get_location();
2965 _mesa_glsl_error(& loc, state, "function `%s' redefined", name);
2969 f = new(ctx) ir_function(name);
2970 if (!state->symbols->add_function(f)) {
2971 /* This function name shadows a non-function use of the same name. */
2972 YYLTYPE loc = this->get_location();
2974 _mesa_glsl_error(&loc, state, "function name `%s' conflicts with "
2975 "non-function", name);
2979 emit_function(state, instructions, f);
2982 /* Verify the return type of main() */
2983 if (strcmp(name, "main") == 0) {
2984 if (! return_type->is_void()) {
2985 YYLTYPE loc = this->get_location();
2987 _mesa_glsl_error(& loc, state, "main() must return void");
2990 if (!hir_parameters.is_empty()) {
2991 YYLTYPE loc = this->get_location();
2993 _mesa_glsl_error(& loc, state, "main() must not take any parameters");
2997 /* Finish storing the information about this new function in its signature.
3000 sig = new(ctx) ir_function_signature(return_type);
3001 f->add_signature(sig);
3004 sig->replace_parameters(&hir_parameters);
3007 /* Function declarations (prototypes) do not have r-values.
3014 ast_function_definition::hir(exec_list *instructions,
3015 struct _mesa_glsl_parse_state *state)
3017 prototype->is_definition = true;
3018 prototype->hir(instructions, state);
3020 ir_function_signature *signature = prototype->signature;
3021 if (signature == NULL)
3024 assert(state->current_function == NULL);
3025 state->current_function = signature;
3026 state->found_return = false;
3028 /* Duplicate parameters declared in the prototype as concrete variables.
3029 * Add these to the symbol table.
3031 state->symbols->push_scope();
3032 foreach_iter(exec_list_iterator, iter, signature->parameters) {
3033 ir_variable *const var = ((ir_instruction *) iter.get())->as_variable();
3035 assert(var != NULL);
3037 /* The only way a parameter would "exist" is if two parameters have
3040 if (state->symbols->name_declared_this_scope(var->name)) {
3041 YYLTYPE loc = this->get_location();
3043 _mesa_glsl_error(& loc, state, "parameter `%s' redeclared", var->name);
3045 state->symbols->add_variable(var);
3049 /* Convert the body of the function to HIR. */
3050 this->body->hir(&signature->body, state);
3051 signature->is_defined = true;
3053 state->symbols->pop_scope();
3055 assert(state->current_function == signature);
3056 state->current_function = NULL;
3058 if (!signature->return_type->is_void() && !state->found_return) {
3059 YYLTYPE loc = this->get_location();
3060 _mesa_glsl_error(& loc, state, "function `%s' has non-void return type "
3061 "%s, but no return statement",
3062 signature->function_name(),
3063 signature->return_type->name);
3066 /* Function definitions do not have r-values.
3073 ast_jump_statement::hir(exec_list *instructions,
3074 struct _mesa_glsl_parse_state *state)
3081 assert(state->current_function);
3083 if (opt_return_value) {
3084 ir_rvalue *const ret = opt_return_value->hir(instructions, state);
3086 /* The value of the return type can be NULL if the shader says
3087 * 'return foo();' and foo() is a function that returns void.
3089 * NOTE: The GLSL spec doesn't say that this is an error. The type
3090 * of the return value is void. If the return type of the function is
3091 * also void, then this should compile without error. Seriously.
3093 const glsl_type *const ret_type =
3094 (ret == NULL) ? glsl_type::void_type : ret->type;
3096 /* Implicit conversions are not allowed for return values. */
3097 if (state->current_function->return_type != ret_type) {
3098 YYLTYPE loc = this->get_location();
3100 _mesa_glsl_error(& loc, state,
3101 "`return' with wrong type %s, in function `%s' "
3104 state->current_function->function_name(),
3105 state->current_function->return_type->name);
3108 inst = new(ctx) ir_return(ret);
3110 if (state->current_function->return_type->base_type !=
3112 YYLTYPE loc = this->get_location();
3114 _mesa_glsl_error(& loc, state,
3115 "`return' with no value, in function %s returning "
3117 state->current_function->function_name());
3119 inst = new(ctx) ir_return;
3122 state->found_return = true;
3123 instructions->push_tail(inst);
3128 if (state->target != fragment_shader) {
3129 YYLTYPE loc = this->get_location();
3131 _mesa_glsl_error(& loc, state,
3132 "`discard' may only appear in a fragment shader");
3134 instructions->push_tail(new(ctx) ir_discard);
3139 /* FINISHME: Handle switch-statements. They cannot contain 'continue',
3140 * FINISHME: and they use a different IR instruction for 'break'.
3142 /* FINISHME: Correctly handle the nesting. If a switch-statement is
3143 * FINISHME: inside a loop, a 'continue' is valid and will bind to the
3146 if (state->loop_or_switch_nesting == NULL) {
3147 YYLTYPE loc = this->get_location();
3149 _mesa_glsl_error(& loc, state,
3150 "`%s' may only appear in a loop",
3151 (mode == ast_break) ? "break" : "continue");
3153 ir_loop *const loop = state->loop_or_switch_nesting->as_loop();
3155 /* Inline the for loop expression again, since we don't know
3156 * where near the end of the loop body the normal copy of it
3157 * is going to be placed.
3159 if (mode == ast_continue &&
3160 state->loop_or_switch_nesting_ast->rest_expression) {
3161 state->loop_or_switch_nesting_ast->rest_expression->hir(instructions,
3166 ir_loop_jump *const jump =
3167 new(ctx) ir_loop_jump((mode == ast_break)
3168 ? ir_loop_jump::jump_break
3169 : ir_loop_jump::jump_continue);
3170 instructions->push_tail(jump);
3177 /* Jump instructions do not have r-values.
3184 ast_selection_statement::hir(exec_list *instructions,
3185 struct _mesa_glsl_parse_state *state)
3189 ir_rvalue *const condition = this->condition->hir(instructions, state);
3191 /* From page 66 (page 72 of the PDF) of the GLSL 1.50 spec:
3193 * "Any expression whose type evaluates to a Boolean can be used as the
3194 * conditional expression bool-expression. Vector types are not accepted
3195 * as the expression to if."
3197 * The checks are separated so that higher quality diagnostics can be
3198 * generated for cases where both rules are violated.
3200 if (!condition->type->is_boolean() || !condition->type->is_scalar()) {
3201 YYLTYPE loc = this->condition->get_location();
3203 _mesa_glsl_error(& loc, state, "if-statement condition must be scalar "
3207 ir_if *const stmt = new(ctx) ir_if(condition);
3209 if (then_statement != NULL) {
3210 state->symbols->push_scope();
3211 then_statement->hir(& stmt->then_instructions, state);
3212 state->symbols->pop_scope();
3215 if (else_statement != NULL) {
3216 state->symbols->push_scope();
3217 else_statement->hir(& stmt->else_instructions, state);
3218 state->symbols->pop_scope();
3221 instructions->push_tail(stmt);
3223 /* if-statements do not have r-values.
3230 ast_iteration_statement::condition_to_hir(ir_loop *stmt,
3231 struct _mesa_glsl_parse_state *state)
3235 if (condition != NULL) {
3236 ir_rvalue *const cond =
3237 condition->hir(& stmt->body_instructions, state);
3240 || !cond->type->is_boolean() || !cond->type->is_scalar()) {
3241 YYLTYPE loc = condition->get_location();
3243 _mesa_glsl_error(& loc, state,
3244 "loop condition must be scalar boolean");
3246 /* As the first code in the loop body, generate a block that looks
3247 * like 'if (!condition) break;' as the loop termination condition.
3249 ir_rvalue *const not_cond =
3250 new(ctx) ir_expression(ir_unop_logic_not, glsl_type::bool_type, cond,
3253 ir_if *const if_stmt = new(ctx) ir_if(not_cond);
3255 ir_jump *const break_stmt =
3256 new(ctx) ir_loop_jump(ir_loop_jump::jump_break);
3258 if_stmt->then_instructions.push_tail(break_stmt);
3259 stmt->body_instructions.push_tail(if_stmt);
3266 ast_iteration_statement::hir(exec_list *instructions,
3267 struct _mesa_glsl_parse_state *state)
3271 /* For-loops and while-loops start a new scope, but do-while loops do not.
3273 if (mode != ast_do_while)
3274 state->symbols->push_scope();
3276 if (init_statement != NULL)
3277 init_statement->hir(instructions, state);
3279 ir_loop *const stmt = new(ctx) ir_loop();
3280 instructions->push_tail(stmt);
3282 /* Track the current loop and / or switch-statement nesting.
3284 ir_instruction *const nesting = state->loop_or_switch_nesting;
3285 ast_iteration_statement *nesting_ast = state->loop_or_switch_nesting_ast;
3287 state->loop_or_switch_nesting = stmt;
3288 state->loop_or_switch_nesting_ast = this;
3290 if (mode != ast_do_while)
3291 condition_to_hir(stmt, state);
3294 body->hir(& stmt->body_instructions, state);
3296 if (rest_expression != NULL)
3297 rest_expression->hir(& stmt->body_instructions, state);
3299 if (mode == ast_do_while)
3300 condition_to_hir(stmt, state);
3302 if (mode != ast_do_while)
3303 state->symbols->pop_scope();
3305 /* Restore previous nesting before returning.
3307 state->loop_or_switch_nesting = nesting;
3308 state->loop_or_switch_nesting_ast = nesting_ast;
3310 /* Loops do not have r-values.
3317 ast_type_specifier::hir(exec_list *instructions,
3318 struct _mesa_glsl_parse_state *state)
3320 if (!this->is_precision_statement && this->structure == NULL)
3323 YYLTYPE loc = this->get_location();
3325 if (this->precision != ast_precision_none
3326 && state->language_version != 100
3327 && state->language_version < 130) {
3328 _mesa_glsl_error(&loc, state,
3329 "precision qualifiers exist only in "
3330 "GLSL ES 1.00, and GLSL 1.30 and later");
3333 if (this->precision != ast_precision_none
3334 && this->structure != NULL) {
3335 _mesa_glsl_error(&loc, state,
3336 "precision qualifiers do not apply to structures");
3340 /* If this is a precision statement, check that the type to which it is
3341 * applied is either float or int.
3343 * From section 4.5.3 of the GLSL 1.30 spec:
3344 * "The precision statement
3345 * precision precision-qualifier type;
3346 * can be used to establish a default precision qualifier. The type
3347 * field can be either int or float [...]. Any other types or
3348 * qualifiers will result in an error.
3350 if (this->is_precision_statement) {
3351 assert(this->precision != ast_precision_none);
3352 assert(this->structure == NULL); /* The check for structures was
3353 * performed above. */
3354 if (this->is_array) {
3355 _mesa_glsl_error(&loc, state,
3356 "default precision statements do not apply to "
3360 if (this->type_specifier != ast_float
3361 && this->type_specifier != ast_int) {
3362 _mesa_glsl_error(&loc, state,
3363 "default precision statements apply only to types "
3368 /* FINISHME: Translate precision statements into IR. */
3372 if (this->structure != NULL)
3373 return this->structure->hir(instructions, state);
3380 ast_struct_specifier::hir(exec_list *instructions,
3381 struct _mesa_glsl_parse_state *state)
3383 unsigned decl_count = 0;
3385 /* Make an initial pass over the list of structure fields to determine how
3386 * many there are. Each element in this list is an ast_declarator_list.
3387 * This means that we actually need to count the number of elements in the
3388 * 'declarations' list in each of the elements.
3390 foreach_list_typed (ast_declarator_list, decl_list, link,
3391 &this->declarations) {
3392 foreach_list_const (decl_ptr, & decl_list->declarations) {
3397 /* Allocate storage for the structure fields and process the field
3398 * declarations. As the declarations are processed, try to also convert
3399 * the types to HIR. This ensures that structure definitions embedded in
3400 * other structure definitions are processed.
3402 glsl_struct_field *const fields = ralloc_array(state, glsl_struct_field,
3406 foreach_list_typed (ast_declarator_list, decl_list, link,
3407 &this->declarations) {
3408 const char *type_name;
3410 decl_list->type->specifier->hir(instructions, state);
3412 /* Section 10.9 of the GLSL ES 1.00 specification states that
3413 * embedded structure definitions have been removed from the language.
3415 if (state->es_shader && decl_list->type->specifier->structure != NULL) {
3416 YYLTYPE loc = this->get_location();
3417 _mesa_glsl_error(&loc, state, "Embedded structure definitions are "
3418 "not allowed in GLSL ES 1.00.");
3421 const glsl_type *decl_type =
3422 decl_list->type->specifier->glsl_type(& type_name, state);
3424 foreach_list_typed (ast_declaration, decl, link,
3425 &decl_list->declarations) {
3426 const struct glsl_type *field_type = decl_type;
3427 if (decl->is_array) {
3428 YYLTYPE loc = decl->get_location();
3429 field_type = process_array_type(&loc, decl_type, decl->array_size,
3432 fields[i].type = (field_type != NULL)
3433 ? field_type : glsl_type::error_type;
3434 fields[i].name = decl->identifier;
3439 assert(i == decl_count);
3441 const glsl_type *t =
3442 glsl_type::get_record_instance(fields, decl_count, this->name);
3444 YYLTYPE loc = this->get_location();
3445 if (!state->symbols->add_type(name, t)) {
3446 _mesa_glsl_error(& loc, state, "struct `%s' previously defined", name);
3448 const glsl_type **s = reralloc(state, state->user_structures,
3450 state->num_user_structures + 1);
3452 s[state->num_user_structures] = t;
3453 state->user_structures = s;
3454 state->num_user_structures++;
3458 /* Structure type definitions do not have r-values.