2 * Copyright © 2010 Intel Corporation
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
21 * DEALINGS IN THE SOFTWARE.
26 * Convert abstract syntax to to high-level intermediate reprensentation (HIR).
28 * During the conversion to HIR, the majority of the symantic checking is
29 * preformed on the program. This includes:
31 * * Symbol table management
35 * The majority of this work could be done during parsing, and the parser could
36 * probably generate HIR directly. However, this results in frequent changes
37 * to the parser code. Since we do not assume that every system this complier
38 * is built on will have Flex and Bison installed, we have to store the code
39 * generated by these tools in our version control system. In other parts of
40 * the system we've seen problems where a parser was changed but the generated
41 * code was not committed, merge conflicts where created because two developers
42 * had slightly different versions of Bison installed, etc.
44 * I have also noticed that running Bison generated parsers in GDB is very
45 * irritating. When you get a segfault on '$$ = $1->foo', you can't very
46 * well 'print $1' in GDB.
48 * As a result, my preference is to put as little C code as possible in the
49 * parser (and lexer) sources.
52 #include "main/core.h" /* for struct gl_extensions */
53 #include "glsl_symbol_table.h"
54 #include "glsl_parser_extras.h"
56 #include "glsl_types.h"
57 #include "program/hash_table.h"
61 detect_conflicting_assignments(struct _mesa_glsl_parse_state *state,
62 exec_list *instructions);
65 _mesa_ast_to_hir(exec_list *instructions, struct _mesa_glsl_parse_state *state)
67 _mesa_glsl_initialize_variables(instructions, state);
69 state->symbols->language_version = state->language_version;
71 state->current_function = NULL;
73 state->toplevel_ir = instructions;
75 /* Section 4.2 of the GLSL 1.20 specification states:
76 * "The built-in functions are scoped in a scope outside the global scope
77 * users declare global variables in. That is, a shader's global scope,
78 * available for user-defined functions and global variables, is nested
79 * inside the scope containing the built-in functions."
81 * Since built-in functions like ftransform() access built-in variables,
82 * it follows that those must be in the outer scope as well.
84 * We push scope here to create this nesting effect...but don't pop.
85 * This way, a shader's globals are still in the symbol table for use
88 state->symbols->push_scope();
90 foreach_list_typed (ast_node, ast, link, & state->translation_unit)
91 ast->hir(instructions, state);
93 detect_recursion_unlinked(state, instructions);
94 detect_conflicting_assignments(state, instructions);
96 state->toplevel_ir = NULL;
101 * If a conversion is available, convert one operand to a different type
103 * The \c from \c ir_rvalue is converted "in place".
105 * \param to Type that the operand it to be converted to
106 * \param from Operand that is being converted
107 * \param state GLSL compiler state
110 * If a conversion is possible (or unnecessary), \c true is returned.
111 * Otherwise \c false is returned.
114 apply_implicit_conversion(const glsl_type *to, ir_rvalue * &from,
115 struct _mesa_glsl_parse_state *state)
118 if (to->base_type == from->type->base_type)
121 /* This conversion was added in GLSL 1.20. If the compilation mode is
122 * GLSL 1.10, the conversion is skipped.
124 if (state->language_version < 120)
127 /* From page 27 (page 33 of the PDF) of the GLSL 1.50 spec:
129 * "There are no implicit array or structure conversions. For
130 * example, an array of int cannot be implicitly converted to an
131 * array of float. There are no implicit conversions between
132 * signed and unsigned integers."
134 /* FINISHME: The above comment is partially a lie. There is int/uint
135 * FINISHME: conversion for immediate constants.
137 if (!to->is_float() || !from->type->is_numeric())
140 /* Convert to a floating point type with the same number of components
141 * as the original type - i.e. int to float, not int to vec4.
143 to = glsl_type::get_instance(GLSL_TYPE_FLOAT, from->type->vector_elements,
144 from->type->matrix_columns);
146 switch (from->type->base_type) {
148 from = new(ctx) ir_expression(ir_unop_i2f, to, from, NULL);
151 from = new(ctx) ir_expression(ir_unop_u2f, to, from, NULL);
154 from = new(ctx) ir_expression(ir_unop_b2f, to, from, NULL);
164 static const struct glsl_type *
165 arithmetic_result_type(ir_rvalue * &value_a, ir_rvalue * &value_b,
167 struct _mesa_glsl_parse_state *state, YYLTYPE *loc)
169 const glsl_type *type_a = value_a->type;
170 const glsl_type *type_b = value_b->type;
172 /* From GLSL 1.50 spec, page 56:
174 * "The arithmetic binary operators add (+), subtract (-),
175 * multiply (*), and divide (/) operate on integer and
176 * floating-point scalars, vectors, and matrices."
178 if (!type_a->is_numeric() || !type_b->is_numeric()) {
179 _mesa_glsl_error(loc, state,
180 "Operands to arithmetic operators must be numeric");
181 return glsl_type::error_type;
185 /* "If one operand is floating-point based and the other is
186 * not, then the conversions from Section 4.1.10 "Implicit
187 * Conversions" are applied to the non-floating-point-based operand."
189 if (!apply_implicit_conversion(type_a, value_b, state)
190 && !apply_implicit_conversion(type_b, value_a, state)) {
191 _mesa_glsl_error(loc, state,
192 "Could not implicitly convert operands to "
193 "arithmetic operator");
194 return glsl_type::error_type;
196 type_a = value_a->type;
197 type_b = value_b->type;
199 /* "If the operands are integer types, they must both be signed or
202 * From this rule and the preceeding conversion it can be inferred that
203 * both types must be GLSL_TYPE_FLOAT, or GLSL_TYPE_UINT, or GLSL_TYPE_INT.
204 * The is_numeric check above already filtered out the case where either
205 * type is not one of these, so now the base types need only be tested for
208 if (type_a->base_type != type_b->base_type) {
209 _mesa_glsl_error(loc, state,
210 "base type mismatch for arithmetic operator");
211 return glsl_type::error_type;
214 /* "All arithmetic binary operators result in the same fundamental type
215 * (signed integer, unsigned integer, or floating-point) as the
216 * operands they operate on, after operand type conversion. After
217 * conversion, the following cases are valid
219 * * The two operands are scalars. In this case the operation is
220 * applied, resulting in a scalar."
222 if (type_a->is_scalar() && type_b->is_scalar())
225 /* "* One operand is a scalar, and the other is a vector or matrix.
226 * In this case, the scalar operation is applied independently to each
227 * component of the vector or matrix, resulting in the same size
230 if (type_a->is_scalar()) {
231 if (!type_b->is_scalar())
233 } else if (type_b->is_scalar()) {
237 /* All of the combinations of <scalar, scalar>, <vector, scalar>,
238 * <scalar, vector>, <scalar, matrix>, and <matrix, scalar> have been
241 assert(!type_a->is_scalar());
242 assert(!type_b->is_scalar());
244 /* "* The two operands are vectors of the same size. In this case, the
245 * operation is done component-wise resulting in the same size
248 if (type_a->is_vector() && type_b->is_vector()) {
249 if (type_a == type_b) {
252 _mesa_glsl_error(loc, state,
253 "vector size mismatch for arithmetic operator");
254 return glsl_type::error_type;
258 /* All of the combinations of <scalar, scalar>, <vector, scalar>,
259 * <scalar, vector>, <scalar, matrix>, <matrix, scalar>, and
260 * <vector, vector> have been handled. At least one of the operands must
261 * be matrix. Further, since there are no integer matrix types, the base
262 * type of both operands must be float.
264 assert(type_a->is_matrix() || type_b->is_matrix());
265 assert(type_a->base_type == GLSL_TYPE_FLOAT);
266 assert(type_b->base_type == GLSL_TYPE_FLOAT);
268 /* "* The operator is add (+), subtract (-), or divide (/), and the
269 * operands are matrices with the same number of rows and the same
270 * number of columns. In this case, the operation is done component-
271 * wise resulting in the same size matrix."
272 * * The operator is multiply (*), where both operands are matrices or
273 * one operand is a vector and the other a matrix. A right vector
274 * operand is treated as a column vector and a left vector operand as a
275 * row vector. In all these cases, it is required that the number of
276 * columns of the left operand is equal to the number of rows of the
277 * right operand. Then, the multiply (*) operation does a linear
278 * algebraic multiply, yielding an object that has the same number of
279 * rows as the left operand and the same number of columns as the right
280 * operand. Section 5.10 "Vector and Matrix Operations" explains in
281 * more detail how vectors and matrices are operated on."
284 if (type_a == type_b)
287 if (type_a->is_matrix() && type_b->is_matrix()) {
288 /* Matrix multiply. The columns of A must match the rows of B. Given
289 * the other previously tested constraints, this means the vector type
290 * of a row from A must be the same as the vector type of a column from
293 if (type_a->row_type() == type_b->column_type()) {
294 /* The resulting matrix has the number of columns of matrix B and
295 * the number of rows of matrix A. We get the row count of A by
296 * looking at the size of a vector that makes up a column. The
297 * transpose (size of a row) is done for B.
299 const glsl_type *const type =
300 glsl_type::get_instance(type_a->base_type,
301 type_a->column_type()->vector_elements,
302 type_b->row_type()->vector_elements);
303 assert(type != glsl_type::error_type);
307 } else if (type_a->is_matrix()) {
308 /* A is a matrix and B is a column vector. Columns of A must match
309 * rows of B. Given the other previously tested constraints, this
310 * means the vector type of a row from A must be the same as the
311 * vector the type of B.
313 if (type_a->row_type() == type_b) {
314 /* The resulting vector has a number of elements equal to
315 * the number of rows of matrix A. */
316 const glsl_type *const type =
317 glsl_type::get_instance(type_a->base_type,
318 type_a->column_type()->vector_elements,
320 assert(type != glsl_type::error_type);
325 assert(type_b->is_matrix());
327 /* A is a row vector and B is a matrix. Columns of A must match rows
328 * of B. Given the other previously tested constraints, this means
329 * the type of A must be the same as the vector type of a column from
332 if (type_a == type_b->column_type()) {
333 /* The resulting vector has a number of elements equal to
334 * the number of columns of matrix B. */
335 const glsl_type *const type =
336 glsl_type::get_instance(type_a->base_type,
337 type_b->row_type()->vector_elements,
339 assert(type != glsl_type::error_type);
345 _mesa_glsl_error(loc, state, "size mismatch for matrix multiplication");
346 return glsl_type::error_type;
350 /* "All other cases are illegal."
352 _mesa_glsl_error(loc, state, "type mismatch");
353 return glsl_type::error_type;
357 static const struct glsl_type *
358 unary_arithmetic_result_type(const struct glsl_type *type,
359 struct _mesa_glsl_parse_state *state, YYLTYPE *loc)
361 /* From GLSL 1.50 spec, page 57:
363 * "The arithmetic unary operators negate (-), post- and pre-increment
364 * and decrement (-- and ++) operate on integer or floating-point
365 * values (including vectors and matrices). All unary operators work
366 * component-wise on their operands. These result with the same type
369 if (!type->is_numeric()) {
370 _mesa_glsl_error(loc, state,
371 "Operands to arithmetic operators must be numeric");
372 return glsl_type::error_type;
379 * \brief Return the result type of a bit-logic operation.
381 * If the given types to the bit-logic operator are invalid, return
382 * glsl_type::error_type.
384 * \param type_a Type of LHS of bit-logic op
385 * \param type_b Type of RHS of bit-logic op
387 static const struct glsl_type *
388 bit_logic_result_type(const struct glsl_type *type_a,
389 const struct glsl_type *type_b,
391 struct _mesa_glsl_parse_state *state, YYLTYPE *loc)
393 if (state->language_version < 130) {
394 _mesa_glsl_error(loc, state, "bit operations require GLSL 1.30");
395 return glsl_type::error_type;
398 /* From page 50 (page 56 of PDF) of GLSL 1.30 spec:
400 * "The bitwise operators and (&), exclusive-or (^), and inclusive-or
401 * (|). The operands must be of type signed or unsigned integers or
404 if (!type_a->is_integer()) {
405 _mesa_glsl_error(loc, state, "LHS of `%s' must be an integer",
406 ast_expression::operator_string(op));
407 return glsl_type::error_type;
409 if (!type_b->is_integer()) {
410 _mesa_glsl_error(loc, state, "RHS of `%s' must be an integer",
411 ast_expression::operator_string(op));
412 return glsl_type::error_type;
415 /* "The fundamental types of the operands (signed or unsigned) must
418 if (type_a->base_type != type_b->base_type) {
419 _mesa_glsl_error(loc, state, "operands of `%s' must have the same "
420 "base type", ast_expression::operator_string(op));
421 return glsl_type::error_type;
424 /* "The operands cannot be vectors of differing size." */
425 if (type_a->is_vector() &&
426 type_b->is_vector() &&
427 type_a->vector_elements != type_b->vector_elements) {
428 _mesa_glsl_error(loc, state, "operands of `%s' cannot be vectors of "
429 "different sizes", ast_expression::operator_string(op));
430 return glsl_type::error_type;
433 /* "If one operand is a scalar and the other a vector, the scalar is
434 * applied component-wise to the vector, resulting in the same type as
435 * the vector. The fundamental types of the operands [...] will be the
436 * resulting fundamental type."
438 if (type_a->is_scalar())
444 static const struct glsl_type *
445 modulus_result_type(const struct glsl_type *type_a,
446 const struct glsl_type *type_b,
447 struct _mesa_glsl_parse_state *state, YYLTYPE *loc)
449 if (state->language_version < 130) {
450 _mesa_glsl_error(loc, state,
451 "operator '%%' is reserved in %s",
452 state->version_string);
453 return glsl_type::error_type;
456 /* From GLSL 1.50 spec, page 56:
457 * "The operator modulus (%) operates on signed or unsigned integers or
458 * integer vectors. The operand types must both be signed or both be
461 if (!type_a->is_integer()) {
462 _mesa_glsl_error(loc, state, "LHS of operator %% must be an integer.");
463 return glsl_type::error_type;
465 if (!type_b->is_integer()) {
466 _mesa_glsl_error(loc, state, "RHS of operator %% must be an integer.");
467 return glsl_type::error_type;
469 if (type_a->base_type != type_b->base_type) {
470 _mesa_glsl_error(loc, state,
471 "operands of %% must have the same base type");
472 return glsl_type::error_type;
475 /* "The operands cannot be vectors of differing size. If one operand is
476 * a scalar and the other vector, then the scalar is applied component-
477 * wise to the vector, resulting in the same type as the vector. If both
478 * are vectors of the same size, the result is computed component-wise."
480 if (type_a->is_vector()) {
481 if (!type_b->is_vector()
482 || (type_a->vector_elements == type_b->vector_elements))
487 /* "The operator modulus (%) is not defined for any other data types
488 * (non-integer types)."
490 _mesa_glsl_error(loc, state, "type mismatch");
491 return glsl_type::error_type;
495 static const struct glsl_type *
496 relational_result_type(ir_rvalue * &value_a, ir_rvalue * &value_b,
497 struct _mesa_glsl_parse_state *state, YYLTYPE *loc)
499 const glsl_type *type_a = value_a->type;
500 const glsl_type *type_b = value_b->type;
502 /* From GLSL 1.50 spec, page 56:
503 * "The relational operators greater than (>), less than (<), greater
504 * than or equal (>=), and less than or equal (<=) operate only on
505 * scalar integer and scalar floating-point expressions."
507 if (!type_a->is_numeric()
508 || !type_b->is_numeric()
509 || !type_a->is_scalar()
510 || !type_b->is_scalar()) {
511 _mesa_glsl_error(loc, state,
512 "Operands to relational operators must be scalar and "
514 return glsl_type::error_type;
517 /* "Either the operands' types must match, or the conversions from
518 * Section 4.1.10 "Implicit Conversions" will be applied to the integer
519 * operand, after which the types must match."
521 if (!apply_implicit_conversion(type_a, value_b, state)
522 && !apply_implicit_conversion(type_b, value_a, state)) {
523 _mesa_glsl_error(loc, state,
524 "Could not implicitly convert operands to "
525 "relational operator");
526 return glsl_type::error_type;
528 type_a = value_a->type;
529 type_b = value_b->type;
531 if (type_a->base_type != type_b->base_type) {
532 _mesa_glsl_error(loc, state, "base type mismatch");
533 return glsl_type::error_type;
536 /* "The result is scalar Boolean."
538 return glsl_type::bool_type;
542 * \brief Return the result type of a bit-shift operation.
544 * If the given types to the bit-shift operator are invalid, return
545 * glsl_type::error_type.
547 * \param type_a Type of LHS of bit-shift op
548 * \param type_b Type of RHS of bit-shift op
550 static const struct glsl_type *
551 shift_result_type(const struct glsl_type *type_a,
552 const struct glsl_type *type_b,
554 struct _mesa_glsl_parse_state *state, YYLTYPE *loc)
556 if (state->language_version < 130) {
557 _mesa_glsl_error(loc, state, "bit operations require GLSL 1.30");
558 return glsl_type::error_type;
561 /* From page 50 (page 56 of the PDF) of the GLSL 1.30 spec:
563 * "The shift operators (<<) and (>>). For both operators, the operands
564 * must be signed or unsigned integers or integer vectors. One operand
565 * can be signed while the other is unsigned."
567 if (!type_a->is_integer()) {
568 _mesa_glsl_error(loc, state, "LHS of operator %s must be an integer or "
569 "integer vector", ast_expression::operator_string(op));
570 return glsl_type::error_type;
573 if (!type_b->is_integer()) {
574 _mesa_glsl_error(loc, state, "RHS of operator %s must be an integer or "
575 "integer vector", ast_expression::operator_string(op));
576 return glsl_type::error_type;
579 /* "If the first operand is a scalar, the second operand has to be
582 if (type_a->is_scalar() && !type_b->is_scalar()) {
583 _mesa_glsl_error(loc, state, "If the first operand of %s is scalar, the "
584 "second must be scalar as well",
585 ast_expression::operator_string(op));
586 return glsl_type::error_type;
589 /* If both operands are vectors, check that they have same number of
592 if (type_a->is_vector() &&
593 type_b->is_vector() &&
594 type_a->vector_elements != type_b->vector_elements) {
595 _mesa_glsl_error(loc, state, "Vector operands to operator %s must "
596 "have same number of elements",
597 ast_expression::operator_string(op));
598 return glsl_type::error_type;
601 /* "In all cases, the resulting type will be the same type as the left
608 * Validates that a value can be assigned to a location with a specified type
610 * Validates that \c rhs can be assigned to some location. If the types are
611 * not an exact match but an automatic conversion is possible, \c rhs will be
615 * \c NULL if \c rhs cannot be assigned to a location with type \c lhs_type.
616 * Otherwise the actual RHS to be assigned will be returned. This may be
617 * \c rhs, or it may be \c rhs after some type conversion.
620 * In addition to being used for assignments, this function is used to
621 * type-check return values.
624 validate_assignment(struct _mesa_glsl_parse_state *state,
625 const glsl_type *lhs_type, ir_rvalue *rhs,
628 /* If there is already some error in the RHS, just return it. Anything
629 * else will lead to an avalanche of error message back to the user.
631 if (rhs->type->is_error())
634 /* If the types are identical, the assignment can trivially proceed.
636 if (rhs->type == lhs_type)
639 /* If the array element types are the same and the size of the LHS is zero,
640 * the assignment is okay for initializers embedded in variable
643 * Note: Whole-array assignments are not permitted in GLSL 1.10, but this
644 * is handled by ir_dereference::is_lvalue.
646 if (is_initializer && lhs_type->is_array() && rhs->type->is_array()
647 && (lhs_type->element_type() == rhs->type->element_type())
648 && (lhs_type->array_size() == 0)) {
652 /* Check for implicit conversion in GLSL 1.20 */
653 if (apply_implicit_conversion(lhs_type, rhs, state)) {
654 if (rhs->type == lhs_type)
662 mark_whole_array_access(ir_rvalue *access)
664 ir_dereference_variable *deref = access->as_dereference_variable();
666 if (deref && deref->var) {
667 deref->var->max_array_access = deref->type->length - 1;
672 do_assignment(exec_list *instructions, struct _mesa_glsl_parse_state *state,
673 const char *non_lvalue_description,
674 ir_rvalue *lhs, ir_rvalue *rhs, bool is_initializer,
678 bool error_emitted = (lhs->type->is_error() || rhs->type->is_error());
680 ir_variable *lhs_var = lhs->variable_referenced();
682 lhs_var->assigned = true;
684 if (!error_emitted) {
685 if (non_lvalue_description != NULL) {
686 _mesa_glsl_error(&lhs_loc, state,
688 non_lvalue_description);
689 error_emitted = true;
690 } else if (lhs->variable_referenced() != NULL
691 && lhs->variable_referenced()->read_only) {
692 _mesa_glsl_error(&lhs_loc, state,
693 "assignment to read-only variable '%s'",
694 lhs->variable_referenced()->name);
695 error_emitted = true;
697 } else if (state->language_version <= 110 && lhs->type->is_array()) {
698 /* From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
700 * "Other binary or unary expressions, non-dereferenced
701 * arrays, function names, swizzles with repeated fields,
702 * and constants cannot be l-values."
704 _mesa_glsl_error(&lhs_loc, state, "whole array assignment is not "
705 "allowed in GLSL 1.10 or GLSL ES 1.00.");
706 error_emitted = true;
707 } else if (!lhs->is_lvalue()) {
708 _mesa_glsl_error(& lhs_loc, state, "non-lvalue in assignment");
709 error_emitted = true;
714 validate_assignment(state, lhs->type, rhs, is_initializer);
715 if (new_rhs == NULL) {
716 _mesa_glsl_error(& lhs_loc, state, "type mismatch");
720 /* If the LHS array was not declared with a size, it takes it size from
721 * the RHS. If the LHS is an l-value and a whole array, it must be a
722 * dereference of a variable. Any other case would require that the LHS
723 * is either not an l-value or not a whole array.
725 if (lhs->type->array_size() == 0) {
726 ir_dereference *const d = lhs->as_dereference();
730 ir_variable *const var = d->variable_referenced();
734 if (var->max_array_access >= unsigned(rhs->type->array_size())) {
735 /* FINISHME: This should actually log the location of the RHS. */
736 _mesa_glsl_error(& lhs_loc, state, "array size must be > %u due to "
738 var->max_array_access);
741 var->type = glsl_type::get_array_instance(lhs->type->element_type(),
742 rhs->type->array_size());
745 mark_whole_array_access(rhs);
746 mark_whole_array_access(lhs);
749 /* Most callers of do_assignment (assign, add_assign, pre_inc/dec,
750 * but not post_inc) need the converted assigned value as an rvalue
751 * to handle things like:
755 * So we always just store the computed value being assigned to a
756 * temporary and return a deref of that temporary. If the rvalue
757 * ends up not being used, the temp will get copy-propagated out.
759 ir_variable *var = new(ctx) ir_variable(rhs->type, "assignment_tmp",
761 ir_dereference_variable *deref_var = new(ctx) ir_dereference_variable(var);
762 instructions->push_tail(var);
763 instructions->push_tail(new(ctx) ir_assignment(deref_var, rhs));
764 deref_var = new(ctx) ir_dereference_variable(var);
767 instructions->push_tail(new(ctx) ir_assignment(lhs, deref_var));
769 return new(ctx) ir_dereference_variable(var);
773 get_lvalue_copy(exec_list *instructions, ir_rvalue *lvalue)
775 void *ctx = ralloc_parent(lvalue);
778 var = new(ctx) ir_variable(lvalue->type, "_post_incdec_tmp",
780 instructions->push_tail(var);
781 var->mode = ir_var_auto;
783 instructions->push_tail(new(ctx) ir_assignment(new(ctx) ir_dereference_variable(var),
786 return new(ctx) ir_dereference_variable(var);
791 ast_node::hir(exec_list *instructions,
792 struct _mesa_glsl_parse_state *state)
801 do_comparison(void *mem_ctx, int operation, ir_rvalue *op0, ir_rvalue *op1)
804 ir_rvalue *cmp = NULL;
806 if (operation == ir_binop_all_equal)
807 join_op = ir_binop_logic_and;
809 join_op = ir_binop_logic_or;
811 switch (op0->type->base_type) {
812 case GLSL_TYPE_FLOAT:
816 return new(mem_ctx) ir_expression(operation, op0, op1);
818 case GLSL_TYPE_ARRAY: {
819 for (unsigned int i = 0; i < op0->type->length; i++) {
820 ir_rvalue *e0, *e1, *result;
822 e0 = new(mem_ctx) ir_dereference_array(op0->clone(mem_ctx, NULL),
823 new(mem_ctx) ir_constant(i));
824 e1 = new(mem_ctx) ir_dereference_array(op1->clone(mem_ctx, NULL),
825 new(mem_ctx) ir_constant(i));
826 result = do_comparison(mem_ctx, operation, e0, e1);
829 cmp = new(mem_ctx) ir_expression(join_op, cmp, result);
835 mark_whole_array_access(op0);
836 mark_whole_array_access(op1);
840 case GLSL_TYPE_STRUCT: {
841 for (unsigned int i = 0; i < op0->type->length; i++) {
842 ir_rvalue *e0, *e1, *result;
843 const char *field_name = op0->type->fields.structure[i].name;
845 e0 = new(mem_ctx) ir_dereference_record(op0->clone(mem_ctx, NULL),
847 e1 = new(mem_ctx) ir_dereference_record(op1->clone(mem_ctx, NULL),
849 result = do_comparison(mem_ctx, operation, e0, e1);
852 cmp = new(mem_ctx) ir_expression(join_op, cmp, result);
860 case GLSL_TYPE_ERROR:
862 case GLSL_TYPE_SAMPLER:
863 /* I assume a comparison of a struct containing a sampler just
864 * ignores the sampler present in the type.
869 assert(!"Should not get here.");
874 cmp = new(mem_ctx) ir_constant(true);
879 /* For logical operations, we want to ensure that the operands are
880 * scalar booleans. If it isn't, emit an error and return a constant
881 * boolean to avoid triggering cascading error messages.
884 get_scalar_boolean_operand(exec_list *instructions,
885 struct _mesa_glsl_parse_state *state,
886 ast_expression *parent_expr,
888 const char *operand_name,
891 ast_expression *expr = parent_expr->subexpressions[operand];
893 ir_rvalue *val = expr->hir(instructions, state);
895 if (val->type->is_boolean() && val->type->is_scalar())
898 if (!*error_emitted) {
899 YYLTYPE loc = expr->get_location();
900 _mesa_glsl_error(&loc, state, "%s of `%s' must be scalar boolean",
902 parent_expr->operator_string(parent_expr->oper));
903 *error_emitted = true;
906 return new(ctx) ir_constant(true);
910 * If name refers to a builtin array whose maximum allowed size is less than
911 * size, report an error and return true. Otherwise return false.
914 check_builtin_array_max_size(const char *name, unsigned size,
915 YYLTYPE loc, struct _mesa_glsl_parse_state *state)
917 if ((strcmp("gl_TexCoord", name) == 0)
918 && (size > state->Const.MaxTextureCoords)) {
919 /* From page 54 (page 60 of the PDF) of the GLSL 1.20 spec:
921 * "The size [of gl_TexCoord] can be at most
922 * gl_MaxTextureCoords."
924 _mesa_glsl_error(&loc, state, "`gl_TexCoord' array size cannot "
925 "be larger than gl_MaxTextureCoords (%u)\n",
926 state->Const.MaxTextureCoords);
928 } else if (strcmp("gl_ClipDistance", name) == 0
929 && size > state->Const.MaxClipPlanes) {
930 /* From section 7.1 (Vertex Shader Special Variables) of the
933 * "The gl_ClipDistance array is predeclared as unsized and
934 * must be sized by the shader either redeclaring it with a
935 * size or indexing it only with integral constant
936 * expressions. ... The size can be at most
937 * gl_MaxClipDistances."
939 _mesa_glsl_error(&loc, state, "`gl_ClipDistance' array size cannot "
940 "be larger than gl_MaxClipDistances (%u)\n",
941 state->Const.MaxClipPlanes);
948 * Create the constant 1, of a which is appropriate for incrementing and
949 * decrementing values of the given GLSL type. For example, if type is vec4,
950 * this creates a constant value of 1.0 having type float.
952 * If the given type is invalid for increment and decrement operators, return
953 * a floating point 1--the error will be detected later.
956 constant_one_for_inc_dec(void *ctx, const glsl_type *type)
958 switch (type->base_type) {
960 return new(ctx) ir_constant((unsigned) 1);
962 return new(ctx) ir_constant(1);
964 case GLSL_TYPE_FLOAT:
965 return new(ctx) ir_constant(1.0f);
970 ast_expression::hir(exec_list *instructions,
971 struct _mesa_glsl_parse_state *state)
974 static const int operations[AST_NUM_OPERATORS] = {
975 -1, /* ast_assign doesn't convert to ir_expression. */
976 -1, /* ast_plus doesn't convert to ir_expression. */
1000 /* Note: The following block of expression types actually convert
1001 * to multiple IR instructions.
1003 ir_binop_mul, /* ast_mul_assign */
1004 ir_binop_div, /* ast_div_assign */
1005 ir_binop_mod, /* ast_mod_assign */
1006 ir_binop_add, /* ast_add_assign */
1007 ir_binop_sub, /* ast_sub_assign */
1008 ir_binop_lshift, /* ast_ls_assign */
1009 ir_binop_rshift, /* ast_rs_assign */
1010 ir_binop_bit_and, /* ast_and_assign */
1011 ir_binop_bit_xor, /* ast_xor_assign */
1012 ir_binop_bit_or, /* ast_or_assign */
1014 -1, /* ast_conditional doesn't convert to ir_expression. */
1015 ir_binop_add, /* ast_pre_inc. */
1016 ir_binop_sub, /* ast_pre_dec. */
1017 ir_binop_add, /* ast_post_inc. */
1018 ir_binop_sub, /* ast_post_dec. */
1019 -1, /* ast_field_selection doesn't conv to ir_expression. */
1020 -1, /* ast_array_index doesn't convert to ir_expression. */
1021 -1, /* ast_function_call doesn't conv to ir_expression. */
1022 -1, /* ast_identifier doesn't convert to ir_expression. */
1023 -1, /* ast_int_constant doesn't convert to ir_expression. */
1024 -1, /* ast_uint_constant doesn't conv to ir_expression. */
1025 -1, /* ast_float_constant doesn't conv to ir_expression. */
1026 -1, /* ast_bool_constant doesn't conv to ir_expression. */
1027 -1, /* ast_sequence doesn't convert to ir_expression. */
1029 ir_rvalue *result = NULL;
1031 const struct glsl_type *type; /* a temporary variable for switch cases */
1032 bool error_emitted = false;
1035 loc = this->get_location();
1037 switch (this->oper) {
1039 op[0] = this->subexpressions[0]->hir(instructions, state);
1040 op[1] = this->subexpressions[1]->hir(instructions, state);
1042 result = do_assignment(instructions, state,
1043 this->subexpressions[0]->non_lvalue_description,
1044 op[0], op[1], false,
1045 this->subexpressions[0]->get_location());
1046 error_emitted = result->type->is_error();
1051 op[0] = this->subexpressions[0]->hir(instructions, state);
1053 type = unary_arithmetic_result_type(op[0]->type, state, & loc);
1055 error_emitted = type->is_error();
1061 op[0] = this->subexpressions[0]->hir(instructions, state);
1063 type = unary_arithmetic_result_type(op[0]->type, state, & loc);
1065 error_emitted = type->is_error();
1067 result = new(ctx) ir_expression(operations[this->oper], type,
1075 op[0] = this->subexpressions[0]->hir(instructions, state);
1076 op[1] = this->subexpressions[1]->hir(instructions, state);
1078 type = arithmetic_result_type(op[0], op[1],
1079 (this->oper == ast_mul),
1081 error_emitted = type->is_error();
1083 result = new(ctx) ir_expression(operations[this->oper], type,
1088 op[0] = this->subexpressions[0]->hir(instructions, state);
1089 op[1] = this->subexpressions[1]->hir(instructions, state);
1091 type = modulus_result_type(op[0]->type, op[1]->type, state, & loc);
1093 assert(operations[this->oper] == ir_binop_mod);
1095 result = new(ctx) ir_expression(operations[this->oper], type,
1097 error_emitted = type->is_error();
1102 if (state->language_version < 130) {
1103 _mesa_glsl_error(&loc, state, "operator %s requires GLSL 1.30",
1104 operator_string(this->oper));
1105 error_emitted = true;
1108 op[0] = this->subexpressions[0]->hir(instructions, state);
1109 op[1] = this->subexpressions[1]->hir(instructions, state);
1110 type = shift_result_type(op[0]->type, op[1]->type, this->oper, state,
1112 result = new(ctx) ir_expression(operations[this->oper], type,
1114 error_emitted = op[0]->type->is_error() || op[1]->type->is_error();
1121 op[0] = this->subexpressions[0]->hir(instructions, state);
1122 op[1] = this->subexpressions[1]->hir(instructions, state);
1124 type = relational_result_type(op[0], op[1], state, & loc);
1126 /* The relational operators must either generate an error or result
1127 * in a scalar boolean. See page 57 of the GLSL 1.50 spec.
1129 assert(type->is_error()
1130 || ((type->base_type == GLSL_TYPE_BOOL)
1131 && type->is_scalar()));
1133 result = new(ctx) ir_expression(operations[this->oper], type,
1135 error_emitted = type->is_error();
1140 op[0] = this->subexpressions[0]->hir(instructions, state);
1141 op[1] = this->subexpressions[1]->hir(instructions, state);
1143 /* From page 58 (page 64 of the PDF) of the GLSL 1.50 spec:
1145 * "The equality operators equal (==), and not equal (!=)
1146 * operate on all types. They result in a scalar Boolean. If
1147 * the operand types do not match, then there must be a
1148 * conversion from Section 4.1.10 "Implicit Conversions"
1149 * applied to one operand that can make them match, in which
1150 * case this conversion is done."
1152 if ((!apply_implicit_conversion(op[0]->type, op[1], state)
1153 && !apply_implicit_conversion(op[1]->type, op[0], state))
1154 || (op[0]->type != op[1]->type)) {
1155 _mesa_glsl_error(& loc, state, "operands of `%s' must have the same "
1156 "type", (this->oper == ast_equal) ? "==" : "!=");
1157 error_emitted = true;
1158 } else if ((state->language_version <= 110)
1159 && (op[0]->type->is_array() || op[1]->type->is_array())) {
1160 _mesa_glsl_error(& loc, state, "array comparisons forbidden in "
1162 error_emitted = true;
1165 if (error_emitted) {
1166 result = new(ctx) ir_constant(false);
1168 result = do_comparison(ctx, operations[this->oper], op[0], op[1]);
1169 assert(result->type == glsl_type::bool_type);
1176 op[0] = this->subexpressions[0]->hir(instructions, state);
1177 op[1] = this->subexpressions[1]->hir(instructions, state);
1178 type = bit_logic_result_type(op[0]->type, op[1]->type, this->oper,
1180 result = new(ctx) ir_expression(operations[this->oper], type,
1182 error_emitted = op[0]->type->is_error() || op[1]->type->is_error();
1186 op[0] = this->subexpressions[0]->hir(instructions, state);
1188 if (state->language_version < 130) {
1189 _mesa_glsl_error(&loc, state, "bit-wise operations require GLSL 1.30");
1190 error_emitted = true;
1193 if (!op[0]->type->is_integer()) {
1194 _mesa_glsl_error(&loc, state, "operand of `~' must be an integer");
1195 error_emitted = true;
1198 type = error_emitted ? glsl_type::error_type : op[0]->type;
1199 result = new(ctx) ir_expression(ir_unop_bit_not, type, op[0], NULL);
1202 case ast_logic_and: {
1203 exec_list rhs_instructions;
1204 op[0] = get_scalar_boolean_operand(instructions, state, this, 0,
1205 "LHS", &error_emitted);
1206 op[1] = get_scalar_boolean_operand(&rhs_instructions, state, this, 1,
1207 "RHS", &error_emitted);
1209 if (rhs_instructions.is_empty()) {
1210 result = new(ctx) ir_expression(ir_binop_logic_and, op[0], op[1]);
1211 type = result->type;
1213 ir_variable *const tmp = new(ctx) ir_variable(glsl_type::bool_type,
1216 instructions->push_tail(tmp);
1218 ir_if *const stmt = new(ctx) ir_if(op[0]);
1219 instructions->push_tail(stmt);
1221 stmt->then_instructions.append_list(&rhs_instructions);
1222 ir_dereference *const then_deref = new(ctx) ir_dereference_variable(tmp);
1223 ir_assignment *const then_assign =
1224 new(ctx) ir_assignment(then_deref, op[1]);
1225 stmt->then_instructions.push_tail(then_assign);
1227 ir_dereference *const else_deref = new(ctx) ir_dereference_variable(tmp);
1228 ir_assignment *const else_assign =
1229 new(ctx) ir_assignment(else_deref, new(ctx) ir_constant(false));
1230 stmt->else_instructions.push_tail(else_assign);
1232 result = new(ctx) ir_dereference_variable(tmp);
1238 case ast_logic_or: {
1239 exec_list rhs_instructions;
1240 op[0] = get_scalar_boolean_operand(instructions, state, this, 0,
1241 "LHS", &error_emitted);
1242 op[1] = get_scalar_boolean_operand(&rhs_instructions, state, this, 1,
1243 "RHS", &error_emitted);
1245 if (rhs_instructions.is_empty()) {
1246 result = new(ctx) ir_expression(ir_binop_logic_or, op[0], op[1]);
1247 type = result->type;
1249 ir_variable *const tmp = new(ctx) ir_variable(glsl_type::bool_type,
1252 instructions->push_tail(tmp);
1254 ir_if *const stmt = new(ctx) ir_if(op[0]);
1255 instructions->push_tail(stmt);
1257 ir_dereference *const then_deref = new(ctx) ir_dereference_variable(tmp);
1258 ir_assignment *const then_assign =
1259 new(ctx) ir_assignment(then_deref, new(ctx) ir_constant(true));
1260 stmt->then_instructions.push_tail(then_assign);
1262 stmt->else_instructions.append_list(&rhs_instructions);
1263 ir_dereference *const else_deref = new(ctx) ir_dereference_variable(tmp);
1264 ir_assignment *const else_assign =
1265 new(ctx) ir_assignment(else_deref, op[1]);
1266 stmt->else_instructions.push_tail(else_assign);
1268 result = new(ctx) ir_dereference_variable(tmp);
1275 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1277 * "The logical binary operators and (&&), or ( | | ), and
1278 * exclusive or (^^). They operate only on two Boolean
1279 * expressions and result in a Boolean expression."
1281 op[0] = get_scalar_boolean_operand(instructions, state, this, 0, "LHS",
1283 op[1] = get_scalar_boolean_operand(instructions, state, this, 1, "RHS",
1286 result = new(ctx) ir_expression(operations[this->oper], glsl_type::bool_type,
1291 op[0] = get_scalar_boolean_operand(instructions, state, this, 0,
1292 "operand", &error_emitted);
1294 result = new(ctx) ir_expression(operations[this->oper], glsl_type::bool_type,
1298 case ast_mul_assign:
1299 case ast_div_assign:
1300 case ast_add_assign:
1301 case ast_sub_assign: {
1302 op[0] = this->subexpressions[0]->hir(instructions, state);
1303 op[1] = this->subexpressions[1]->hir(instructions, state);
1305 type = arithmetic_result_type(op[0], op[1],
1306 (this->oper == ast_mul_assign),
1309 ir_rvalue *temp_rhs = new(ctx) ir_expression(operations[this->oper], type,
1312 result = do_assignment(instructions, state,
1313 this->subexpressions[0]->non_lvalue_description,
1314 op[0]->clone(ctx, NULL), temp_rhs, false,
1315 this->subexpressions[0]->get_location());
1316 error_emitted = (op[0]->type->is_error());
1318 /* GLSL 1.10 does not allow array assignment. However, we don't have to
1319 * explicitly test for this because none of the binary expression
1320 * operators allow array operands either.
1326 case ast_mod_assign: {
1327 op[0] = this->subexpressions[0]->hir(instructions, state);
1328 op[1] = this->subexpressions[1]->hir(instructions, state);
1330 type = modulus_result_type(op[0]->type, op[1]->type, state, & loc);
1332 assert(operations[this->oper] == ir_binop_mod);
1334 ir_rvalue *temp_rhs;
1335 temp_rhs = new(ctx) ir_expression(operations[this->oper], type,
1338 result = do_assignment(instructions, state,
1339 this->subexpressions[0]->non_lvalue_description,
1340 op[0]->clone(ctx, NULL), temp_rhs, false,
1341 this->subexpressions[0]->get_location());
1342 error_emitted = type->is_error();
1347 case ast_rs_assign: {
1348 op[0] = this->subexpressions[0]->hir(instructions, state);
1349 op[1] = this->subexpressions[1]->hir(instructions, state);
1350 type = shift_result_type(op[0]->type, op[1]->type, this->oper, state,
1352 ir_rvalue *temp_rhs = new(ctx) ir_expression(operations[this->oper],
1353 type, op[0], op[1]);
1354 result = do_assignment(instructions, state,
1355 this->subexpressions[0]->non_lvalue_description,
1356 op[0]->clone(ctx, NULL), temp_rhs, false,
1357 this->subexpressions[0]->get_location());
1358 error_emitted = op[0]->type->is_error() || op[1]->type->is_error();
1362 case ast_and_assign:
1363 case ast_xor_assign:
1364 case ast_or_assign: {
1365 op[0] = this->subexpressions[0]->hir(instructions, state);
1366 op[1] = this->subexpressions[1]->hir(instructions, state);
1367 type = bit_logic_result_type(op[0]->type, op[1]->type, this->oper,
1369 ir_rvalue *temp_rhs = new(ctx) ir_expression(operations[this->oper],
1370 type, op[0], op[1]);
1371 result = do_assignment(instructions, state,
1372 this->subexpressions[0]->non_lvalue_description,
1373 op[0]->clone(ctx, NULL), temp_rhs, false,
1374 this->subexpressions[0]->get_location());
1375 error_emitted = op[0]->type->is_error() || op[1]->type->is_error();
1379 case ast_conditional: {
1380 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1382 * "The ternary selection operator (?:). It operates on three
1383 * expressions (exp1 ? exp2 : exp3). This operator evaluates the
1384 * first expression, which must result in a scalar Boolean."
1386 op[0] = get_scalar_boolean_operand(instructions, state, this, 0,
1387 "condition", &error_emitted);
1389 /* The :? operator is implemented by generating an anonymous temporary
1390 * followed by an if-statement. The last instruction in each branch of
1391 * the if-statement assigns a value to the anonymous temporary. This
1392 * temporary is the r-value of the expression.
1394 exec_list then_instructions;
1395 exec_list else_instructions;
1397 op[1] = this->subexpressions[1]->hir(&then_instructions, state);
1398 op[2] = this->subexpressions[2]->hir(&else_instructions, state);
1400 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1402 * "The second and third expressions can be any type, as
1403 * long their types match, or there is a conversion in
1404 * Section 4.1.10 "Implicit Conversions" that can be applied
1405 * to one of the expressions to make their types match. This
1406 * resulting matching type is the type of the entire
1409 if ((!apply_implicit_conversion(op[1]->type, op[2], state)
1410 && !apply_implicit_conversion(op[2]->type, op[1], state))
1411 || (op[1]->type != op[2]->type)) {
1412 YYLTYPE loc = this->subexpressions[1]->get_location();
1414 _mesa_glsl_error(& loc, state, "Second and third operands of ?: "
1415 "operator must have matching types.");
1416 error_emitted = true;
1417 type = glsl_type::error_type;
1422 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1424 * "The second and third expressions must be the same type, but can
1425 * be of any type other than an array."
1427 if ((state->language_version <= 110) && type->is_array()) {
1428 _mesa_glsl_error(& loc, state, "Second and third operands of ?: "
1429 "operator must not be arrays.");
1430 error_emitted = true;
1433 ir_constant *cond_val = op[0]->constant_expression_value();
1434 ir_constant *then_val = op[1]->constant_expression_value();
1435 ir_constant *else_val = op[2]->constant_expression_value();
1437 if (then_instructions.is_empty()
1438 && else_instructions.is_empty()
1439 && (cond_val != NULL) && (then_val != NULL) && (else_val != NULL)) {
1440 result = (cond_val->value.b[0]) ? then_val : else_val;
1442 ir_variable *const tmp =
1443 new(ctx) ir_variable(type, "conditional_tmp", ir_var_temporary);
1444 instructions->push_tail(tmp);
1446 ir_if *const stmt = new(ctx) ir_if(op[0]);
1447 instructions->push_tail(stmt);
1449 then_instructions.move_nodes_to(& stmt->then_instructions);
1450 ir_dereference *const then_deref =
1451 new(ctx) ir_dereference_variable(tmp);
1452 ir_assignment *const then_assign =
1453 new(ctx) ir_assignment(then_deref, op[1]);
1454 stmt->then_instructions.push_tail(then_assign);
1456 else_instructions.move_nodes_to(& stmt->else_instructions);
1457 ir_dereference *const else_deref =
1458 new(ctx) ir_dereference_variable(tmp);
1459 ir_assignment *const else_assign =
1460 new(ctx) ir_assignment(else_deref, op[2]);
1461 stmt->else_instructions.push_tail(else_assign);
1463 result = new(ctx) ir_dereference_variable(tmp);
1470 this->non_lvalue_description = (this->oper == ast_pre_inc)
1471 ? "pre-increment operation" : "pre-decrement operation";
1473 op[0] = this->subexpressions[0]->hir(instructions, state);
1474 op[1] = constant_one_for_inc_dec(ctx, op[0]->type);
1476 type = arithmetic_result_type(op[0], op[1], false, state, & loc);
1478 ir_rvalue *temp_rhs;
1479 temp_rhs = new(ctx) ir_expression(operations[this->oper], type,
1482 result = do_assignment(instructions, state,
1483 this->subexpressions[0]->non_lvalue_description,
1484 op[0]->clone(ctx, NULL), temp_rhs, false,
1485 this->subexpressions[0]->get_location());
1486 error_emitted = op[0]->type->is_error();
1491 case ast_post_dec: {
1492 this->non_lvalue_description = (this->oper == ast_post_inc)
1493 ? "post-increment operation" : "post-decrement operation";
1494 op[0] = this->subexpressions[0]->hir(instructions, state);
1495 op[1] = constant_one_for_inc_dec(ctx, op[0]->type);
1497 error_emitted = op[0]->type->is_error() || op[1]->type->is_error();
1499 type = arithmetic_result_type(op[0], op[1], false, state, & loc);
1501 ir_rvalue *temp_rhs;
1502 temp_rhs = new(ctx) ir_expression(operations[this->oper], type,
1505 /* Get a temporary of a copy of the lvalue before it's modified.
1506 * This may get thrown away later.
1508 result = get_lvalue_copy(instructions, op[0]->clone(ctx, NULL));
1510 (void)do_assignment(instructions, state,
1511 this->subexpressions[0]->non_lvalue_description,
1512 op[0]->clone(ctx, NULL), temp_rhs, false,
1513 this->subexpressions[0]->get_location());
1515 error_emitted = op[0]->type->is_error();
1519 case ast_field_selection:
1520 result = _mesa_ast_field_selection_to_hir(this, instructions, state);
1523 case ast_array_index: {
1524 YYLTYPE index_loc = subexpressions[1]->get_location();
1526 op[0] = subexpressions[0]->hir(instructions, state);
1527 op[1] = subexpressions[1]->hir(instructions, state);
1529 error_emitted = op[0]->type->is_error() || op[1]->type->is_error();
1531 ir_rvalue *const array = op[0];
1533 result = new(ctx) ir_dereference_array(op[0], op[1]);
1535 /* Do not use op[0] after this point. Use array.
1543 if (!array->type->is_array()
1544 && !array->type->is_matrix()
1545 && !array->type->is_vector()) {
1546 _mesa_glsl_error(& index_loc, state,
1547 "cannot dereference non-array / non-matrix / "
1549 error_emitted = true;
1552 if (!op[1]->type->is_integer()) {
1553 _mesa_glsl_error(& index_loc, state,
1554 "array index must be integer type");
1555 error_emitted = true;
1556 } else if (!op[1]->type->is_scalar()) {
1557 _mesa_glsl_error(& index_loc, state,
1558 "array index must be scalar");
1559 error_emitted = true;
1562 /* If the array index is a constant expression and the array has a
1563 * declared size, ensure that the access is in-bounds. If the array
1564 * index is not a constant expression, ensure that the array has a
1567 ir_constant *const const_index = op[1]->constant_expression_value();
1568 if (const_index != NULL) {
1569 const int idx = const_index->value.i[0];
1570 const char *type_name;
1573 if (array->type->is_matrix()) {
1574 type_name = "matrix";
1575 } else if (array->type->is_vector()) {
1576 type_name = "vector";
1578 type_name = "array";
1581 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec:
1583 * "It is illegal to declare an array with a size, and then
1584 * later (in the same shader) index the same array with an
1585 * integral constant expression greater than or equal to the
1586 * declared size. It is also illegal to index an array with a
1587 * negative constant expression."
1589 if (array->type->is_matrix()) {
1590 if (array->type->row_type()->vector_elements <= idx) {
1591 bound = array->type->row_type()->vector_elements;
1593 } else if (array->type->is_vector()) {
1594 if (array->type->vector_elements <= idx) {
1595 bound = array->type->vector_elements;
1598 if ((array->type->array_size() > 0)
1599 && (array->type->array_size() <= idx)) {
1600 bound = array->type->array_size();
1605 _mesa_glsl_error(& loc, state, "%s index must be < %u",
1607 error_emitted = true;
1608 } else if (idx < 0) {
1609 _mesa_glsl_error(& loc, state, "%s index must be >= 0",
1611 error_emitted = true;
1614 if (array->type->is_array()) {
1615 /* If the array is a variable dereference, it dereferences the
1616 * whole array, by definition. Use this to get the variable.
1618 * FINISHME: Should some methods for getting / setting / testing
1619 * FINISHME: array access limits be added to ir_dereference?
1621 ir_variable *const v = array->whole_variable_referenced();
1622 if ((v != NULL) && (unsigned(idx) > v->max_array_access)) {
1623 v->max_array_access = idx;
1625 /* Check whether this access will, as a side effect, implicitly
1626 * cause the size of a built-in array to be too large.
1628 if (check_builtin_array_max_size(v->name, idx+1, loc, state))
1629 error_emitted = true;
1632 } else if (array->type->array_size() == 0) {
1633 _mesa_glsl_error(&loc, state, "unsized array index must be constant");
1635 if (array->type->is_array()) {
1636 /* whole_variable_referenced can return NULL if the array is a
1637 * member of a structure. In this case it is safe to not update
1638 * the max_array_access field because it is never used for fields
1641 ir_variable *v = array->whole_variable_referenced();
1643 v->max_array_access = array->type->array_size() - 1;
1647 /* From page 23 (29 of the PDF) of the GLSL 1.30 spec:
1649 * "Samplers aggregated into arrays within a shader (using square
1650 * brackets [ ]) can only be indexed with integral constant
1651 * expressions [...]."
1653 * This restriction was added in GLSL 1.30. Shaders using earlier version
1654 * of the language should not be rejected by the compiler front-end for
1655 * using this construct. This allows useful things such as using a loop
1656 * counter as the index to an array of samplers. If the loop in unrolled,
1657 * the code should compile correctly. Instead, emit a warning.
1659 if (array->type->is_array() &&
1660 array->type->element_type()->is_sampler() &&
1661 const_index == NULL) {
1663 if (state->language_version == 100) {
1664 _mesa_glsl_warning(&loc, state,
1665 "sampler arrays indexed with non-constant "
1666 "expressions is optional in GLSL ES 1.00");
1667 } else if (state->language_version < 130) {
1668 _mesa_glsl_warning(&loc, state,
1669 "sampler arrays indexed with non-constant "
1670 "expressions is forbidden in GLSL 1.30 and "
1673 _mesa_glsl_error(&loc, state,
1674 "sampler arrays indexed with non-constant "
1675 "expressions is forbidden in GLSL 1.30 and "
1677 error_emitted = true;
1682 result->type = glsl_type::error_type;
1687 case ast_function_call:
1688 /* Should *NEVER* get here. ast_function_call should always be handled
1689 * by ast_function_expression::hir.
1694 case ast_identifier: {
1695 /* ast_identifier can appear several places in a full abstract syntax
1696 * tree. This particular use must be at location specified in the grammar
1697 * as 'variable_identifier'.
1700 state->symbols->get_variable(this->primary_expression.identifier);
1704 result = new(ctx) ir_dereference_variable(var);
1706 _mesa_glsl_error(& loc, state, "`%s' undeclared",
1707 this->primary_expression.identifier);
1709 result = ir_rvalue::error_value(ctx);
1710 error_emitted = true;
1715 case ast_int_constant:
1716 result = new(ctx) ir_constant(this->primary_expression.int_constant);
1719 case ast_uint_constant:
1720 result = new(ctx) ir_constant(this->primary_expression.uint_constant);
1723 case ast_float_constant:
1724 result = new(ctx) ir_constant(this->primary_expression.float_constant);
1727 case ast_bool_constant:
1728 result = new(ctx) ir_constant(bool(this->primary_expression.bool_constant));
1731 case ast_sequence: {
1732 /* It should not be possible to generate a sequence in the AST without
1733 * any expressions in it.
1735 assert(!this->expressions.is_empty());
1737 /* The r-value of a sequence is the last expression in the sequence. If
1738 * the other expressions in the sequence do not have side-effects (and
1739 * therefore add instructions to the instruction list), they get dropped
1742 exec_node *previous_tail_pred = NULL;
1743 YYLTYPE previous_operand_loc = loc;
1745 foreach_list_typed (ast_node, ast, link, &this->expressions) {
1746 /* If one of the operands of comma operator does not generate any
1747 * code, we want to emit a warning. At each pass through the loop
1748 * previous_tail_pred will point to the last instruction in the
1749 * stream *before* processing the previous operand. Naturally,
1750 * instructions->tail_pred will point to the last instruction in the
1751 * stream *after* processing the previous operand. If the two
1752 * pointers match, then the previous operand had no effect.
1754 * The warning behavior here differs slightly from GCC. GCC will
1755 * only emit a warning if none of the left-hand operands have an
1756 * effect. However, it will emit a warning for each. I believe that
1757 * there are some cases in C (especially with GCC extensions) where
1758 * it is useful to have an intermediate step in a sequence have no
1759 * effect, but I don't think these cases exist in GLSL. Either way,
1760 * it would be a giant hassle to replicate that behavior.
1762 if (previous_tail_pred == instructions->tail_pred) {
1763 _mesa_glsl_warning(&previous_operand_loc, state,
1764 "left-hand operand of comma expression has "
1768 /* tail_pred is directly accessed instead of using the get_tail()
1769 * method for performance reasons. get_tail() has extra code to
1770 * return NULL when the list is empty. We don't care about that
1771 * here, so using tail_pred directly is fine.
1773 previous_tail_pred = instructions->tail_pred;
1774 previous_operand_loc = ast->get_location();
1776 result = ast->hir(instructions, state);
1779 /* Any errors should have already been emitted in the loop above.
1781 error_emitted = true;
1785 type = NULL; /* use result->type, not type. */
1786 assert(result != NULL);
1788 if (result->type->is_error() && !error_emitted)
1789 _mesa_glsl_error(& loc, state, "type mismatch");
1796 ast_expression_statement::hir(exec_list *instructions,
1797 struct _mesa_glsl_parse_state *state)
1799 /* It is possible to have expression statements that don't have an
1800 * expression. This is the solitary semicolon:
1802 * for (i = 0; i < 5; i++)
1805 * In this case the expression will be NULL. Test for NULL and don't do
1806 * anything in that case.
1808 if (expression != NULL)
1809 expression->hir(instructions, state);
1811 /* Statements do not have r-values.
1818 ast_compound_statement::hir(exec_list *instructions,
1819 struct _mesa_glsl_parse_state *state)
1822 state->symbols->push_scope();
1824 foreach_list_typed (ast_node, ast, link, &this->statements)
1825 ast->hir(instructions, state);
1828 state->symbols->pop_scope();
1830 /* Compound statements do not have r-values.
1836 static const glsl_type *
1837 process_array_type(YYLTYPE *loc, const glsl_type *base, ast_node *array_size,
1838 struct _mesa_glsl_parse_state *state)
1840 unsigned length = 0;
1842 /* From page 19 (page 25) of the GLSL 1.20 spec:
1844 * "Only one-dimensional arrays may be declared."
1846 if (base->is_array()) {
1847 _mesa_glsl_error(loc, state,
1848 "invalid array of `%s' (only one-dimensional arrays "
1851 return glsl_type::error_type;
1854 if (array_size != NULL) {
1855 exec_list dummy_instructions;
1856 ir_rvalue *const ir = array_size->hir(& dummy_instructions, state);
1857 YYLTYPE loc = array_size->get_location();
1860 if (!ir->type->is_integer()) {
1861 _mesa_glsl_error(& loc, state, "array size must be integer type");
1862 } else if (!ir->type->is_scalar()) {
1863 _mesa_glsl_error(& loc, state, "array size must be scalar type");
1865 ir_constant *const size = ir->constant_expression_value();
1868 _mesa_glsl_error(& loc, state, "array size must be a "
1869 "constant valued expression");
1870 } else if (size->value.i[0] <= 0) {
1871 _mesa_glsl_error(& loc, state, "array size must be > 0");
1873 assert(size->type == ir->type);
1874 length = size->value.u[0];
1876 /* If the array size is const (and we've verified that
1877 * it is) then no instructions should have been emitted
1878 * when we converted it to HIR. If they were emitted,
1879 * then either the array size isn't const after all, or
1880 * we are emitting unnecessary instructions.
1882 assert(dummy_instructions.is_empty());
1886 } else if (state->es_shader) {
1887 /* Section 10.17 of the GLSL ES 1.00 specification states that unsized
1888 * array declarations have been removed from the language.
1890 _mesa_glsl_error(loc, state, "unsized array declarations are not "
1891 "allowed in GLSL ES 1.00.");
1894 return glsl_type::get_array_instance(base, length);
1899 ast_type_specifier::glsl_type(const char **name,
1900 struct _mesa_glsl_parse_state *state) const
1902 const struct glsl_type *type;
1904 type = state->symbols->get_type(this->type_name);
1905 *name = this->type_name;
1907 if (this->is_array) {
1908 YYLTYPE loc = this->get_location();
1909 type = process_array_type(&loc, type, this->array_size, state);
1917 apply_type_qualifier_to_variable(const struct ast_type_qualifier *qual,
1919 struct _mesa_glsl_parse_state *state,
1921 bool ubo_qualifiers_valid)
1923 if (qual->flags.q.invariant) {
1925 _mesa_glsl_error(loc, state,
1926 "variable `%s' may not be redeclared "
1927 "`invariant' after being used",
1934 if (qual->flags.q.constant || qual->flags.q.attribute
1935 || qual->flags.q.uniform
1936 || (qual->flags.q.varying && (state->target == fragment_shader)))
1939 if (qual->flags.q.centroid)
1942 if (qual->flags.q.attribute && state->target != vertex_shader) {
1943 var->type = glsl_type::error_type;
1944 _mesa_glsl_error(loc, state,
1945 "`attribute' variables may not be declared in the "
1947 _mesa_glsl_shader_target_name(state->target));
1950 /* From page 25 (page 31 of the PDF) of the GLSL 1.10 spec:
1952 * "The varying qualifier can be used only with the data types
1953 * float, vec2, vec3, vec4, mat2, mat3, and mat4, or arrays of
1956 if (qual->flags.q.varying) {
1957 const glsl_type *non_array_type;
1959 if (var->type && var->type->is_array())
1960 non_array_type = var->type->fields.array;
1962 non_array_type = var->type;
1964 if (non_array_type && non_array_type->base_type != GLSL_TYPE_FLOAT) {
1965 var->type = glsl_type::error_type;
1966 _mesa_glsl_error(loc, state,
1967 "varying variables must be of base type float");
1971 /* If there is no qualifier that changes the mode of the variable, leave
1972 * the setting alone.
1974 if (qual->flags.q.in && qual->flags.q.out)
1975 var->mode = ir_var_inout;
1976 else if (qual->flags.q.attribute || qual->flags.q.in
1977 || (qual->flags.q.varying && (state->target == fragment_shader)))
1978 var->mode = ir_var_in;
1979 else if (qual->flags.q.out
1980 || (qual->flags.q.varying && (state->target == vertex_shader)))
1981 var->mode = ir_var_out;
1982 else if (qual->flags.q.uniform)
1983 var->mode = ir_var_uniform;
1985 if (state->all_invariant && (state->current_function == NULL)) {
1986 switch (state->target) {
1988 if (var->mode == ir_var_out)
1989 var->invariant = true;
1991 case geometry_shader:
1992 if ((var->mode == ir_var_in) || (var->mode == ir_var_out))
1993 var->invariant = true;
1995 case fragment_shader:
1996 if (var->mode == ir_var_in)
1997 var->invariant = true;
2002 if (qual->flags.q.flat)
2003 var->interpolation = INTERP_QUALIFIER_FLAT;
2004 else if (qual->flags.q.noperspective)
2005 var->interpolation = INTERP_QUALIFIER_NOPERSPECTIVE;
2006 else if (qual->flags.q.smooth)
2007 var->interpolation = INTERP_QUALIFIER_SMOOTH;
2009 var->interpolation = INTERP_QUALIFIER_NONE;
2011 if (var->interpolation != INTERP_QUALIFIER_NONE &&
2012 !(state->target == vertex_shader && var->mode == ir_var_out) &&
2013 !(state->target == fragment_shader && var->mode == ir_var_in)) {
2014 _mesa_glsl_error(loc, state,
2015 "interpolation qualifier `%s' can only be applied to "
2016 "vertex shader outputs and fragment shader inputs.",
2017 var->interpolation_string());
2020 var->pixel_center_integer = qual->flags.q.pixel_center_integer;
2021 var->origin_upper_left = qual->flags.q.origin_upper_left;
2022 if ((qual->flags.q.origin_upper_left || qual->flags.q.pixel_center_integer)
2023 && (strcmp(var->name, "gl_FragCoord") != 0)) {
2024 const char *const qual_string = (qual->flags.q.origin_upper_left)
2025 ? "origin_upper_left" : "pixel_center_integer";
2027 _mesa_glsl_error(loc, state,
2028 "layout qualifier `%s' can only be applied to "
2029 "fragment shader input `gl_FragCoord'",
2033 if (qual->flags.q.explicit_location) {
2034 const bool global_scope = (state->current_function == NULL);
2036 const char *string = "";
2038 /* In the vertex shader only shader inputs can be given explicit
2041 * In the fragment shader only shader outputs can be given explicit
2044 switch (state->target) {
2046 if (!global_scope || (var->mode != ir_var_in)) {
2052 case geometry_shader:
2053 _mesa_glsl_error(loc, state,
2054 "geometry shader variables cannot be given "
2055 "explicit locations\n");
2058 case fragment_shader:
2059 if (!global_scope || (var->mode != ir_var_out)) {
2067 _mesa_glsl_error(loc, state,
2068 "only %s shader %s variables can be given an "
2069 "explicit location\n",
2070 _mesa_glsl_shader_target_name(state->target),
2073 var->explicit_location = true;
2075 /* This bit of silliness is needed because invalid explicit locations
2076 * are supposed to be flagged during linking. Small negative values
2077 * biased by VERT_ATTRIB_GENERIC0 or FRAG_RESULT_DATA0 could alias
2078 * built-in values (e.g., -16+VERT_ATTRIB_GENERIC0 = VERT_ATTRIB_POS).
2079 * The linker needs to be able to differentiate these cases. This
2080 * ensures that negative values stay negative.
2082 if (qual->location >= 0) {
2083 var->location = (state->target == vertex_shader)
2084 ? (qual->location + VERT_ATTRIB_GENERIC0)
2085 : (qual->location + FRAG_RESULT_DATA0);
2087 var->location = qual->location;
2089 if (qual->flags.q.explicit_index) {
2090 var->explicit_index = true;
2091 var->index = qual->index;
2094 } else if (qual->flags.q.explicit_index) {
2095 _mesa_glsl_error(loc, state,
2096 "explicit index requires explicit location\n");
2099 /* Does the declaration use the 'layout' keyword?
2101 const bool uses_layout = qual->flags.q.pixel_center_integer
2102 || qual->flags.q.origin_upper_left
2103 || qual->flags.q.explicit_location; /* no need for index since it relies on location */
2105 /* Does the declaration use the deprecated 'attribute' or 'varying'
2108 const bool uses_deprecated_qualifier = qual->flags.q.attribute
2109 || qual->flags.q.varying;
2111 /* Is the 'layout' keyword used with parameters that allow relaxed checking.
2112 * Many implementations of GL_ARB_fragment_coord_conventions_enable and some
2113 * implementations (only Mesa?) GL_ARB_explicit_attrib_location_enable
2114 * allowed the layout qualifier to be used with 'varying' and 'attribute'.
2115 * These extensions and all following extensions that add the 'layout'
2116 * keyword have been modified to require the use of 'in' or 'out'.
2118 * The following extension do not allow the deprecated keywords:
2120 * GL_AMD_conservative_depth
2121 * GL_ARB_conservative_depth
2122 * GL_ARB_gpu_shader5
2123 * GL_ARB_separate_shader_objects
2124 * GL_ARB_tesselation_shader
2125 * GL_ARB_transform_feedback3
2126 * GL_ARB_uniform_buffer_object
2128 * It is unknown whether GL_EXT_shader_image_load_store or GL_NV_gpu_shader5
2129 * allow layout with the deprecated keywords.
2131 const bool relaxed_layout_qualifier_checking =
2132 state->ARB_fragment_coord_conventions_enable;
2134 if (uses_layout && uses_deprecated_qualifier) {
2135 if (relaxed_layout_qualifier_checking) {
2136 _mesa_glsl_warning(loc, state,
2137 "`layout' qualifier may not be used with "
2138 "`attribute' or `varying'");
2140 _mesa_glsl_error(loc, state,
2141 "`layout' qualifier may not be used with "
2142 "`attribute' or `varying'");
2146 /* Layout qualifiers for gl_FragDepth, which are enabled by extension
2147 * AMD_conservative_depth.
2149 int depth_layout_count = qual->flags.q.depth_any
2150 + qual->flags.q.depth_greater
2151 + qual->flags.q.depth_less
2152 + qual->flags.q.depth_unchanged;
2153 if (depth_layout_count > 0
2154 && !state->AMD_conservative_depth_enable
2155 && !state->ARB_conservative_depth_enable) {
2156 _mesa_glsl_error(loc, state,
2157 "extension GL_AMD_conservative_depth or "
2158 "GL_ARB_conservative_depth must be enabled "
2159 "to use depth layout qualifiers");
2160 } else if (depth_layout_count > 0
2161 && strcmp(var->name, "gl_FragDepth") != 0) {
2162 _mesa_glsl_error(loc, state,
2163 "depth layout qualifiers can be applied only to "
2165 } else if (depth_layout_count > 1
2166 && strcmp(var->name, "gl_FragDepth") == 0) {
2167 _mesa_glsl_error(loc, state,
2168 "at most one depth layout qualifier can be applied to "
2171 if (qual->flags.q.depth_any)
2172 var->depth_layout = ir_depth_layout_any;
2173 else if (qual->flags.q.depth_greater)
2174 var->depth_layout = ir_depth_layout_greater;
2175 else if (qual->flags.q.depth_less)
2176 var->depth_layout = ir_depth_layout_less;
2177 else if (qual->flags.q.depth_unchanged)
2178 var->depth_layout = ir_depth_layout_unchanged;
2180 var->depth_layout = ir_depth_layout_none;
2182 if (qual->flags.q.std140 ||
2183 qual->flags.q.packed ||
2184 qual->flags.q.shared) {
2185 _mesa_glsl_error(loc, state,
2186 "uniform block layout qualifiers std140, packed, and "
2187 "shared can only be applied to uniform blocks, not "
2191 if (!ubo_qualifiers_valid &&
2192 (qual->flags.q.row_major || qual->flags.q.column_major)) {
2193 _mesa_glsl_error(loc, state,
2194 "uniform block layout qualifiers row_major and "
2195 "column_major can only be applied to uniform block "
2201 * Get the variable that is being redeclared by this declaration
2203 * Semantic checks to verify the validity of the redeclaration are also
2204 * performed. If semantic checks fail, compilation error will be emitted via
2205 * \c _mesa_glsl_error, but a non-\c NULL pointer will still be returned.
2208 * A pointer to an existing variable in the current scope if the declaration
2209 * is a redeclaration, \c NULL otherwise.
2212 get_variable_being_redeclared(ir_variable *var, ast_declaration *decl,
2213 struct _mesa_glsl_parse_state *state)
2215 /* Check if this declaration is actually a re-declaration, either to
2216 * resize an array or add qualifiers to an existing variable.
2218 * This is allowed for variables in the current scope, or when at
2219 * global scope (for built-ins in the implicit outer scope).
2221 ir_variable *earlier = state->symbols->get_variable(decl->identifier);
2222 if (earlier == NULL ||
2223 (state->current_function != NULL &&
2224 !state->symbols->name_declared_this_scope(decl->identifier))) {
2229 YYLTYPE loc = decl->get_location();
2231 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec,
2233 * "It is legal to declare an array without a size and then
2234 * later re-declare the same name as an array of the same
2235 * type and specify a size."
2237 if ((earlier->type->array_size() == 0)
2238 && var->type->is_array()
2239 && (var->type->element_type() == earlier->type->element_type())) {
2240 /* FINISHME: This doesn't match the qualifiers on the two
2241 * FINISHME: declarations. It's not 100% clear whether this is
2242 * FINISHME: required or not.
2245 const unsigned size = unsigned(var->type->array_size());
2246 check_builtin_array_max_size(var->name, size, loc, state);
2247 if ((size > 0) && (size <= earlier->max_array_access)) {
2248 _mesa_glsl_error(& loc, state, "array size must be > %u due to "
2250 earlier->max_array_access);
2253 earlier->type = var->type;
2256 } else if (state->ARB_fragment_coord_conventions_enable
2257 && strcmp(var->name, "gl_FragCoord") == 0
2258 && earlier->type == var->type
2259 && earlier->mode == var->mode) {
2260 /* Allow redeclaration of gl_FragCoord for ARB_fcc layout
2263 earlier->origin_upper_left = var->origin_upper_left;
2264 earlier->pixel_center_integer = var->pixel_center_integer;
2266 /* According to section 4.3.7 of the GLSL 1.30 spec,
2267 * the following built-in varaibles can be redeclared with an
2268 * interpolation qualifier:
2271 * * gl_FrontSecondaryColor
2272 * * gl_BackSecondaryColor
2274 * * gl_SecondaryColor
2276 } else if (state->language_version >= 130
2277 && (strcmp(var->name, "gl_FrontColor") == 0
2278 || strcmp(var->name, "gl_BackColor") == 0
2279 || strcmp(var->name, "gl_FrontSecondaryColor") == 0
2280 || strcmp(var->name, "gl_BackSecondaryColor") == 0
2281 || strcmp(var->name, "gl_Color") == 0
2282 || strcmp(var->name, "gl_SecondaryColor") == 0)
2283 && earlier->type == var->type
2284 && earlier->mode == var->mode) {
2285 earlier->interpolation = var->interpolation;
2287 /* Layout qualifiers for gl_FragDepth. */
2288 } else if ((state->AMD_conservative_depth_enable ||
2289 state->ARB_conservative_depth_enable)
2290 && strcmp(var->name, "gl_FragDepth") == 0
2291 && earlier->type == var->type
2292 && earlier->mode == var->mode) {
2294 /** From the AMD_conservative_depth spec:
2295 * Within any shader, the first redeclarations of gl_FragDepth
2296 * must appear before any use of gl_FragDepth.
2298 if (earlier->used) {
2299 _mesa_glsl_error(&loc, state,
2300 "the first redeclaration of gl_FragDepth "
2301 "must appear before any use of gl_FragDepth");
2304 /* Prevent inconsistent redeclaration of depth layout qualifier. */
2305 if (earlier->depth_layout != ir_depth_layout_none
2306 && earlier->depth_layout != var->depth_layout) {
2307 _mesa_glsl_error(&loc, state,
2308 "gl_FragDepth: depth layout is declared here "
2309 "as '%s, but it was previously declared as "
2311 depth_layout_string(var->depth_layout),
2312 depth_layout_string(earlier->depth_layout));
2315 earlier->depth_layout = var->depth_layout;
2318 _mesa_glsl_error(&loc, state, "`%s' redeclared", decl->identifier);
2325 * Generate the IR for an initializer in a variable declaration
2328 process_initializer(ir_variable *var, ast_declaration *decl,
2329 ast_fully_specified_type *type,
2330 exec_list *initializer_instructions,
2331 struct _mesa_glsl_parse_state *state)
2333 ir_rvalue *result = NULL;
2335 YYLTYPE initializer_loc = decl->initializer->get_location();
2337 /* From page 24 (page 30 of the PDF) of the GLSL 1.10 spec:
2339 * "All uniform variables are read-only and are initialized either
2340 * directly by an application via API commands, or indirectly by
2343 if ((state->language_version <= 110)
2344 && (var->mode == ir_var_uniform)) {
2345 _mesa_glsl_error(& initializer_loc, state,
2346 "cannot initialize uniforms in GLSL 1.10");
2349 if (var->type->is_sampler()) {
2350 _mesa_glsl_error(& initializer_loc, state,
2351 "cannot initialize samplers");
2354 if ((var->mode == ir_var_in) && (state->current_function == NULL)) {
2355 _mesa_glsl_error(& initializer_loc, state,
2356 "cannot initialize %s shader input / %s",
2357 _mesa_glsl_shader_target_name(state->target),
2358 (state->target == vertex_shader)
2359 ? "attribute" : "varying");
2362 ir_dereference *const lhs = new(state) ir_dereference_variable(var);
2363 ir_rvalue *rhs = decl->initializer->hir(initializer_instructions,
2366 /* Calculate the constant value if this is a const or uniform
2369 if (type->qualifier.flags.q.constant
2370 || type->qualifier.flags.q.uniform) {
2371 ir_rvalue *new_rhs = validate_assignment(state, var->type, rhs, true);
2372 if (new_rhs != NULL) {
2375 ir_constant *constant_value = rhs->constant_expression_value();
2376 if (!constant_value) {
2377 _mesa_glsl_error(& initializer_loc, state,
2378 "initializer of %s variable `%s' must be a "
2379 "constant expression",
2380 (type->qualifier.flags.q.constant)
2381 ? "const" : "uniform",
2383 if (var->type->is_numeric()) {
2384 /* Reduce cascading errors. */
2385 var->constant_value = ir_constant::zero(state, var->type);
2388 rhs = constant_value;
2389 var->constant_value = constant_value;
2392 _mesa_glsl_error(&initializer_loc, state,
2393 "initializer of type %s cannot be assigned to "
2394 "variable of type %s",
2395 rhs->type->name, var->type->name);
2396 if (var->type->is_numeric()) {
2397 /* Reduce cascading errors. */
2398 var->constant_value = ir_constant::zero(state, var->type);
2403 if (rhs && !rhs->type->is_error()) {
2404 bool temp = var->read_only;
2405 if (type->qualifier.flags.q.constant)
2406 var->read_only = false;
2408 /* Never emit code to initialize a uniform.
2410 const glsl_type *initializer_type;
2411 if (!type->qualifier.flags.q.uniform) {
2412 result = do_assignment(initializer_instructions, state,
2415 type->get_location());
2416 initializer_type = result->type;
2418 initializer_type = rhs->type;
2420 var->constant_initializer = rhs->constant_expression_value();
2421 var->has_initializer = true;
2423 /* If the declared variable is an unsized array, it must inherrit
2424 * its full type from the initializer. A declaration such as
2426 * uniform float a[] = float[](1.0, 2.0, 3.0, 3.0);
2430 * uniform float a[4] = float[](1.0, 2.0, 3.0, 3.0);
2432 * The assignment generated in the if-statement (below) will also
2433 * automatically handle this case for non-uniforms.
2435 * If the declared variable is not an array, the types must
2436 * already match exactly. As a result, the type assignment
2437 * here can be done unconditionally. For non-uniforms the call
2438 * to do_assignment can change the type of the initializer (via
2439 * the implicit conversion rules). For uniforms the initializer
2440 * must be a constant expression, and the type of that expression
2441 * was validated above.
2443 var->type = initializer_type;
2445 var->read_only = temp;
2452 ast_declarator_list::hir(exec_list *instructions,
2453 struct _mesa_glsl_parse_state *state)
2456 const struct glsl_type *decl_type;
2457 const char *type_name = NULL;
2458 ir_rvalue *result = NULL;
2459 YYLTYPE loc = this->get_location();
2461 /* From page 46 (page 52 of the PDF) of the GLSL 1.50 spec:
2463 * "To ensure that a particular output variable is invariant, it is
2464 * necessary to use the invariant qualifier. It can either be used to
2465 * qualify a previously declared variable as being invariant
2467 * invariant gl_Position; // make existing gl_Position be invariant"
2469 * In these cases the parser will set the 'invariant' flag in the declarator
2470 * list, and the type will be NULL.
2472 if (this->invariant) {
2473 assert(this->type == NULL);
2475 if (state->current_function != NULL) {
2476 _mesa_glsl_error(& loc, state,
2477 "All uses of `invariant' keyword must be at global "
2481 foreach_list_typed (ast_declaration, decl, link, &this->declarations) {
2482 assert(!decl->is_array);
2483 assert(decl->array_size == NULL);
2484 assert(decl->initializer == NULL);
2486 ir_variable *const earlier =
2487 state->symbols->get_variable(decl->identifier);
2488 if (earlier == NULL) {
2489 _mesa_glsl_error(& loc, state,
2490 "Undeclared variable `%s' cannot be marked "
2491 "invariant\n", decl->identifier);
2492 } else if ((state->target == vertex_shader)
2493 && (earlier->mode != ir_var_out)) {
2494 _mesa_glsl_error(& loc, state,
2495 "`%s' cannot be marked invariant, vertex shader "
2496 "outputs only\n", decl->identifier);
2497 } else if ((state->target == fragment_shader)
2498 && (earlier->mode != ir_var_in)) {
2499 _mesa_glsl_error(& loc, state,
2500 "`%s' cannot be marked invariant, fragment shader "
2501 "inputs only\n", decl->identifier);
2502 } else if (earlier->used) {
2503 _mesa_glsl_error(& loc, state,
2504 "variable `%s' may not be redeclared "
2505 "`invariant' after being used",
2508 earlier->invariant = true;
2512 /* Invariant redeclarations do not have r-values.
2517 assert(this->type != NULL);
2518 assert(!this->invariant);
2520 /* The type specifier may contain a structure definition. Process that
2521 * before any of the variable declarations.
2523 (void) this->type->specifier->hir(instructions, state);
2525 decl_type = this->type->specifier->glsl_type(& type_name, state);
2526 if (this->declarations.is_empty()) {
2527 /* If there is no structure involved in the program text, there are two
2528 * possible scenarios:
2530 * - The program text contained something like 'vec4;'. This is an
2531 * empty declaration. It is valid but weird. Emit a warning.
2533 * - The program text contained something like 'S;' and 'S' is not the
2534 * name of a known structure type. This is both invalid and weird.
2537 * Note that if decl_type is NULL and there is a structure involved,
2538 * there must have been some sort of error with the structure. In this
2539 * case we assume that an error was already generated on this line of
2540 * code for the structure. There is no need to generate an additional,
2543 assert(this->type->specifier->structure == NULL || decl_type != NULL
2545 if (this->type->specifier->structure == NULL) {
2546 if (decl_type != NULL) {
2547 _mesa_glsl_warning(&loc, state, "empty declaration");
2549 _mesa_glsl_error(&loc, state,
2550 "invalid type `%s' in empty declaration",
2556 foreach_list_typed (ast_declaration, decl, link, &this->declarations) {
2557 const struct glsl_type *var_type;
2560 /* FINISHME: Emit a warning if a variable declaration shadows a
2561 * FINISHME: declaration at a higher scope.
2564 if ((decl_type == NULL) || decl_type->is_void()) {
2565 if (type_name != NULL) {
2566 _mesa_glsl_error(& loc, state,
2567 "invalid type `%s' in declaration of `%s'",
2568 type_name, decl->identifier);
2570 _mesa_glsl_error(& loc, state,
2571 "invalid type in declaration of `%s'",
2577 if (decl->is_array) {
2578 var_type = process_array_type(&loc, decl_type, decl->array_size,
2580 if (var_type->is_error())
2583 var_type = decl_type;
2586 var = new(ctx) ir_variable(var_type, decl->identifier, ir_var_auto);
2588 /* From page 22 (page 28 of the PDF) of the GLSL 1.10 specification;
2590 * "Global variables can only use the qualifiers const,
2591 * attribute, uni form, or varying. Only one may be
2594 * Local variables can only use the qualifier const."
2596 * This is relaxed in GLSL 1.30. It is also relaxed by any extension
2597 * that adds the 'layout' keyword.
2599 if ((state->language_version < 130)
2600 && !state->ARB_explicit_attrib_location_enable
2601 && !state->ARB_fragment_coord_conventions_enable) {
2602 if (this->type->qualifier.flags.q.out) {
2603 _mesa_glsl_error(& loc, state,
2604 "`out' qualifier in declaration of `%s' "
2605 "only valid for function parameters in %s.",
2606 decl->identifier, state->version_string);
2608 if (this->type->qualifier.flags.q.in) {
2609 _mesa_glsl_error(& loc, state,
2610 "`in' qualifier in declaration of `%s' "
2611 "only valid for function parameters in %s.",
2612 decl->identifier, state->version_string);
2614 /* FINISHME: Test for other invalid qualifiers. */
2617 apply_type_qualifier_to_variable(& this->type->qualifier, var, state,
2618 & loc, this->ubo_qualifiers_valid);
2620 if (this->type->qualifier.flags.q.invariant) {
2621 if ((state->target == vertex_shader) && !(var->mode == ir_var_out ||
2622 var->mode == ir_var_inout)) {
2623 /* FINISHME: Note that this doesn't work for invariant on
2624 * a function signature outval
2626 _mesa_glsl_error(& loc, state,
2627 "`%s' cannot be marked invariant, vertex shader "
2628 "outputs only\n", var->name);
2629 } else if ((state->target == fragment_shader) &&
2630 !(var->mode == ir_var_in || var->mode == ir_var_inout)) {
2631 /* FINISHME: Note that this doesn't work for invariant on
2632 * a function signature inval
2634 _mesa_glsl_error(& loc, state,
2635 "`%s' cannot be marked invariant, fragment shader "
2636 "inputs only\n", var->name);
2640 if (state->current_function != NULL) {
2641 const char *mode = NULL;
2642 const char *extra = "";
2644 /* There is no need to check for 'inout' here because the parser will
2645 * only allow that in function parameter lists.
2647 if (this->type->qualifier.flags.q.attribute) {
2649 } else if (this->type->qualifier.flags.q.uniform) {
2651 } else if (this->type->qualifier.flags.q.varying) {
2653 } else if (this->type->qualifier.flags.q.in) {
2655 extra = " or in function parameter list";
2656 } else if (this->type->qualifier.flags.q.out) {
2658 extra = " or in function parameter list";
2662 _mesa_glsl_error(& loc, state,
2663 "%s variable `%s' must be declared at "
2665 mode, var->name, extra);
2667 } else if (var->mode == ir_var_in) {
2668 var->read_only = true;
2670 if (state->target == vertex_shader) {
2671 bool error_emitted = false;
2673 /* From page 31 (page 37 of the PDF) of the GLSL 1.50 spec:
2675 * "Vertex shader inputs can only be float, floating-point
2676 * vectors, matrices, signed and unsigned integers and integer
2677 * vectors. Vertex shader inputs can also form arrays of these
2678 * types, but not structures."
2680 * From page 31 (page 27 of the PDF) of the GLSL 1.30 spec:
2682 * "Vertex shader inputs can only be float, floating-point
2683 * vectors, matrices, signed and unsigned integers and integer
2684 * vectors. They cannot be arrays or structures."
2686 * From page 23 (page 29 of the PDF) of the GLSL 1.20 spec:
2688 * "The attribute qualifier can be used only with float,
2689 * floating-point vectors, and matrices. Attribute variables
2690 * cannot be declared as arrays or structures."
2692 const glsl_type *check_type = var->type->is_array()
2693 ? var->type->fields.array : var->type;
2695 switch (check_type->base_type) {
2696 case GLSL_TYPE_FLOAT:
2698 case GLSL_TYPE_UINT:
2700 if (state->language_version > 120)
2704 _mesa_glsl_error(& loc, state,
2705 "vertex shader input / attribute cannot have "
2707 var->type->is_array() ? "array of " : "",
2709 error_emitted = true;
2712 if (!error_emitted && (state->language_version <= 130)
2713 && var->type->is_array()) {
2714 _mesa_glsl_error(& loc, state,
2715 "vertex shader input / attribute cannot have "
2717 error_emitted = true;
2722 /* Integer vertex outputs must be qualified with 'flat'.
2724 * From section 4.3.6 of the GLSL 1.30 spec:
2725 * "If a vertex output is a signed or unsigned integer or integer
2726 * vector, then it must be qualified with the interpolation qualifier
2729 if (state->language_version >= 130
2730 && state->target == vertex_shader
2731 && state->current_function == NULL
2732 && var->type->is_integer()
2733 && var->mode == ir_var_out
2734 && var->interpolation != INTERP_QUALIFIER_FLAT) {
2736 _mesa_glsl_error(&loc, state, "If a vertex output is an integer, "
2737 "then it must be qualified with 'flat'");
2741 /* Interpolation qualifiers cannot be applied to 'centroid' and
2742 * 'centroid varying'.
2744 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
2745 * "interpolation qualifiers may only precede the qualifiers in,
2746 * centroid in, out, or centroid out in a declaration. They do not apply
2747 * to the deprecated storage qualifiers varying or centroid varying."
2749 if (state->language_version >= 130
2750 && this->type->qualifier.has_interpolation()
2751 && this->type->qualifier.flags.q.varying) {
2753 const char *i = this->type->qualifier.interpolation_string();
2756 if (this->type->qualifier.flags.q.centroid)
2757 s = "centroid varying";
2761 _mesa_glsl_error(&loc, state,
2762 "qualifier '%s' cannot be applied to the "
2763 "deprecated storage qualifier '%s'", i, s);
2767 /* Interpolation qualifiers can only apply to vertex shader outputs and
2768 * fragment shader inputs.
2770 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
2771 * "Outputs from a vertex shader (out) and inputs to a fragment
2772 * shader (in) can be further qualified with one or more of these
2773 * interpolation qualifiers"
2775 if (state->language_version >= 130
2776 && this->type->qualifier.has_interpolation()) {
2778 const char *i = this->type->qualifier.interpolation_string();
2781 switch (state->target) {
2783 if (this->type->qualifier.flags.q.in) {
2784 _mesa_glsl_error(&loc, state,
2785 "qualifier '%s' cannot be applied to vertex "
2786 "shader inputs", i);
2789 case fragment_shader:
2790 if (this->type->qualifier.flags.q.out) {
2791 _mesa_glsl_error(&loc, state,
2792 "qualifier '%s' cannot be applied to fragment "
2793 "shader outputs", i);
2802 /* From section 4.3.4 of the GLSL 1.30 spec:
2803 * "It is an error to use centroid in in a vertex shader."
2805 if (state->language_version >= 130
2806 && this->type->qualifier.flags.q.centroid
2807 && this->type->qualifier.flags.q.in
2808 && state->target == vertex_shader) {
2810 _mesa_glsl_error(&loc, state,
2811 "'centroid in' cannot be used in a vertex shader");
2815 /* Precision qualifiers exists only in GLSL versions 1.00 and >= 1.30.
2817 if (this->type->specifier->precision != ast_precision_none
2818 && state->language_version != 100
2819 && state->language_version < 130) {
2821 _mesa_glsl_error(&loc, state,
2822 "precision qualifiers are supported only in GLSL ES "
2823 "1.00, and GLSL 1.30 and later");
2827 /* Precision qualifiers only apply to floating point and integer types.
2829 * From section 4.5.2 of the GLSL 1.30 spec:
2830 * "Any floating point or any integer declaration can have the type
2831 * preceded by one of these precision qualifiers [...] Literal
2832 * constants do not have precision qualifiers. Neither do Boolean
2835 * In GLSL ES, sampler types are also allowed.
2837 * From page 87 of the GLSL ES spec:
2838 * "RESOLUTION: Allow sampler types to take a precision qualifier."
2840 if (this->type->specifier->precision != ast_precision_none
2841 && !var->type->is_float()
2842 && !var->type->is_integer()
2843 && !(var->type->is_sampler() && state->es_shader)
2844 && !(var->type->is_array()
2845 && (var->type->fields.array->is_float()
2846 || var->type->fields.array->is_integer()))) {
2848 _mesa_glsl_error(&loc, state,
2849 "precision qualifiers apply only to floating point"
2850 "%s types", state->es_shader ? ", integer, and sampler"
2854 /* From page 17 (page 23 of the PDF) of the GLSL 1.20 spec:
2856 * "[Sampler types] can only be declared as function
2857 * parameters or uniform variables (see Section 4.3.5
2860 if (var_type->contains_sampler() &&
2861 !this->type->qualifier.flags.q.uniform) {
2862 _mesa_glsl_error(&loc, state, "samplers must be declared uniform");
2865 /* Process the initializer and add its instructions to a temporary
2866 * list. This list will be added to the instruction stream (below) after
2867 * the declaration is added. This is done because in some cases (such as
2868 * redeclarations) the declaration may not actually be added to the
2869 * instruction stream.
2871 exec_list initializer_instructions;
2872 ir_variable *earlier = get_variable_being_redeclared(var, decl, state);
2874 if (decl->initializer != NULL) {
2875 result = process_initializer((earlier == NULL) ? var : earlier,
2877 &initializer_instructions, state);
2880 /* From page 23 (page 29 of the PDF) of the GLSL 1.10 spec:
2882 * "It is an error to write to a const variable outside of
2883 * its declaration, so they must be initialized when
2886 if (this->type->qualifier.flags.q.constant && decl->initializer == NULL) {
2887 _mesa_glsl_error(& loc, state,
2888 "const declaration of `%s' must be initialized",
2892 /* If the declaration is not a redeclaration, there are a few additional
2893 * semantic checks that must be applied. In addition, variable that was
2894 * created for the declaration should be added to the IR stream.
2896 if (earlier == NULL) {
2897 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
2899 * "Identifiers starting with "gl_" are reserved for use by
2900 * OpenGL, and may not be declared in a shader as either a
2901 * variable or a function."
2903 if (strncmp(decl->identifier, "gl_", 3) == 0)
2904 _mesa_glsl_error(& loc, state,
2905 "identifier `%s' uses reserved `gl_' prefix",
2907 else if (strstr(decl->identifier, "__")) {
2908 /* From page 14 (page 20 of the PDF) of the GLSL 1.10
2911 * "In addition, all identifiers containing two
2912 * consecutive underscores (__) are reserved as
2913 * possible future keywords."
2915 _mesa_glsl_error(& loc, state,
2916 "identifier `%s' uses reserved `__' string",
2920 /* Add the variable to the symbol table. Note that the initializer's
2921 * IR was already processed earlier (though it hasn't been emitted
2922 * yet), without the variable in scope.
2924 * This differs from most C-like languages, but it follows the GLSL
2925 * specification. From page 28 (page 34 of the PDF) of the GLSL 1.50
2928 * "Within a declaration, the scope of a name starts immediately
2929 * after the initializer if present or immediately after the name
2930 * being declared if not."
2932 if (!state->symbols->add_variable(var)) {
2933 YYLTYPE loc = this->get_location();
2934 _mesa_glsl_error(&loc, state, "name `%s' already taken in the "
2935 "current scope", decl->identifier);
2939 /* Push the variable declaration to the top. It means that all the
2940 * variable declarations will appear in a funny last-to-first order,
2941 * but otherwise we run into trouble if a function is prototyped, a
2942 * global var is decled, then the function is defined with usage of
2943 * the global var. See glslparsertest's CorrectModule.frag.
2945 instructions->push_head(var);
2948 instructions->append_list(&initializer_instructions);
2952 /* Generally, variable declarations do not have r-values. However,
2953 * one is used for the declaration in
2955 * while (bool b = some_condition()) {
2959 * so we return the rvalue from the last seen declaration here.
2966 ast_parameter_declarator::hir(exec_list *instructions,
2967 struct _mesa_glsl_parse_state *state)
2970 const struct glsl_type *type;
2971 const char *name = NULL;
2972 YYLTYPE loc = this->get_location();
2974 type = this->type->specifier->glsl_type(& name, state);
2978 _mesa_glsl_error(& loc, state,
2979 "invalid type `%s' in declaration of `%s'",
2980 name, this->identifier);
2982 _mesa_glsl_error(& loc, state,
2983 "invalid type in declaration of `%s'",
2987 type = glsl_type::error_type;
2990 /* From page 62 (page 68 of the PDF) of the GLSL 1.50 spec:
2992 * "Functions that accept no input arguments need not use void in the
2993 * argument list because prototypes (or definitions) are required and
2994 * therefore there is no ambiguity when an empty argument list "( )" is
2995 * declared. The idiom "(void)" as a parameter list is provided for
2998 * Placing this check here prevents a void parameter being set up
2999 * for a function, which avoids tripping up checks for main taking
3000 * parameters and lookups of an unnamed symbol.
3002 if (type->is_void()) {
3003 if (this->identifier != NULL)
3004 _mesa_glsl_error(& loc, state,
3005 "named parameter cannot have type `void'");
3011 if (formal_parameter && (this->identifier == NULL)) {
3012 _mesa_glsl_error(& loc, state, "formal parameter lacks a name");
3016 /* This only handles "vec4 foo[..]". The earlier specifier->glsl_type(...)
3017 * call already handled the "vec4[..] foo" case.
3019 if (this->is_array) {
3020 type = process_array_type(&loc, type, this->array_size, state);
3023 if (!type->is_error() && type->array_size() == 0) {
3024 _mesa_glsl_error(&loc, state, "arrays passed as parameters must have "
3025 "a declared size.");
3026 type = glsl_type::error_type;
3030 ir_variable *var = new(ctx) ir_variable(type, this->identifier, ir_var_in);
3032 /* Apply any specified qualifiers to the parameter declaration. Note that
3033 * for function parameters the default mode is 'in'.
3035 apply_type_qualifier_to_variable(& this->type->qualifier, var, state, & loc,
3038 /* From page 17 (page 23 of the PDF) of the GLSL 1.20 spec:
3040 * "Samplers cannot be treated as l-values; hence cannot be used
3041 * as out or inout function parameters, nor can they be assigned
3044 if ((var->mode == ir_var_inout || var->mode == ir_var_out)
3045 && type->contains_sampler()) {
3046 _mesa_glsl_error(&loc, state, "out and inout parameters cannot contain samplers");
3047 type = glsl_type::error_type;
3050 /* From page 39 (page 45 of the PDF) of the GLSL 1.10 spec:
3052 * "When calling a function, expressions that do not evaluate to
3053 * l-values cannot be passed to parameters declared as out or inout."
3055 * From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
3057 * "Other binary or unary expressions, non-dereferenced arrays,
3058 * function names, swizzles with repeated fields, and constants
3059 * cannot be l-values."
3061 * So for GLSL 1.10, passing an array as an out or inout parameter is not
3062 * allowed. This restriction is removed in GLSL 1.20, and in GLSL ES.
3064 if ((var->mode == ir_var_inout || var->mode == ir_var_out)
3065 && type->is_array() && state->language_version == 110) {
3066 _mesa_glsl_error(&loc, state, "Arrays cannot be out or inout parameters in GLSL 1.10");
3067 type = glsl_type::error_type;
3070 instructions->push_tail(var);
3072 /* Parameter declarations do not have r-values.
3079 ast_parameter_declarator::parameters_to_hir(exec_list *ast_parameters,
3081 exec_list *ir_parameters,
3082 _mesa_glsl_parse_state *state)
3084 ast_parameter_declarator *void_param = NULL;
3087 foreach_list_typed (ast_parameter_declarator, param, link, ast_parameters) {
3088 param->formal_parameter = formal;
3089 param->hir(ir_parameters, state);
3097 if ((void_param != NULL) && (count > 1)) {
3098 YYLTYPE loc = void_param->get_location();
3100 _mesa_glsl_error(& loc, state,
3101 "`void' parameter must be only parameter");
3107 emit_function(_mesa_glsl_parse_state *state, ir_function *f)
3109 /* IR invariants disallow function declarations or definitions
3110 * nested within other function definitions. But there is no
3111 * requirement about the relative order of function declarations
3112 * and definitions with respect to one another. So simply insert
3113 * the new ir_function block at the end of the toplevel instruction
3116 state->toplevel_ir->push_tail(f);
3121 ast_function::hir(exec_list *instructions,
3122 struct _mesa_glsl_parse_state *state)
3125 ir_function *f = NULL;
3126 ir_function_signature *sig = NULL;
3127 exec_list hir_parameters;
3129 const char *const name = identifier;
3131 /* New functions are always added to the top-level IR instruction stream,
3132 * so this instruction list pointer is ignored. See also emit_function
3135 (void) instructions;
3137 /* From page 21 (page 27 of the PDF) of the GLSL 1.20 spec,
3139 * "Function declarations (prototypes) cannot occur inside of functions;
3140 * they must be at global scope, or for the built-in functions, outside
3141 * the global scope."
3143 * From page 27 (page 33 of the PDF) of the GLSL ES 1.00.16 spec,
3145 * "User defined functions may only be defined within the global scope."
3147 * Note that this language does not appear in GLSL 1.10.
3149 if ((state->current_function != NULL) && (state->language_version != 110)) {
3150 YYLTYPE loc = this->get_location();
3151 _mesa_glsl_error(&loc, state,
3152 "declaration of function `%s' not allowed within "
3153 "function body", name);
3156 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
3158 * "Identifiers starting with "gl_" are reserved for use by
3159 * OpenGL, and may not be declared in a shader as either a
3160 * variable or a function."
3162 if (strncmp(name, "gl_", 3) == 0) {
3163 YYLTYPE loc = this->get_location();
3164 _mesa_glsl_error(&loc, state,
3165 "identifier `%s' uses reserved `gl_' prefix", name);
3168 /* Convert the list of function parameters to HIR now so that they can be
3169 * used below to compare this function's signature with previously seen
3170 * signatures for functions with the same name.
3172 ast_parameter_declarator::parameters_to_hir(& this->parameters,
3174 & hir_parameters, state);
3176 const char *return_type_name;
3177 const glsl_type *return_type =
3178 this->return_type->specifier->glsl_type(& return_type_name, state);
3181 YYLTYPE loc = this->get_location();
3182 _mesa_glsl_error(&loc, state,
3183 "function `%s' has undeclared return type `%s'",
3184 name, return_type_name);
3185 return_type = glsl_type::error_type;
3188 /* From page 56 (page 62 of the PDF) of the GLSL 1.30 spec:
3189 * "No qualifier is allowed on the return type of a function."
3191 if (this->return_type->has_qualifiers()) {
3192 YYLTYPE loc = this->get_location();
3193 _mesa_glsl_error(& loc, state,
3194 "function `%s' return type has qualifiers", name);
3197 /* From page 17 (page 23 of the PDF) of the GLSL 1.20 spec:
3199 * "[Sampler types] can only be declared as function parameters
3200 * or uniform variables (see Section 4.3.5 "Uniform")".
3202 if (return_type->contains_sampler()) {
3203 YYLTYPE loc = this->get_location();
3204 _mesa_glsl_error(&loc, state,
3205 "function `%s' return type can't contain a sampler",
3209 /* Verify that this function's signature either doesn't match a previously
3210 * seen signature for a function with the same name, or, if a match is found,
3211 * that the previously seen signature does not have an associated definition.
3213 f = state->symbols->get_function(name);
3214 if (f != NULL && (state->es_shader || f->has_user_signature())) {
3215 sig = f->exact_matching_signature(&hir_parameters);
3217 const char *badvar = sig->qualifiers_match(&hir_parameters);
3218 if (badvar != NULL) {
3219 YYLTYPE loc = this->get_location();
3221 _mesa_glsl_error(&loc, state, "function `%s' parameter `%s' "
3222 "qualifiers don't match prototype", name, badvar);
3225 if (sig->return_type != return_type) {
3226 YYLTYPE loc = this->get_location();
3228 _mesa_glsl_error(&loc, state, "function `%s' return type doesn't "
3229 "match prototype", name);
3232 if (is_definition && sig->is_defined) {
3233 YYLTYPE loc = this->get_location();
3235 _mesa_glsl_error(& loc, state, "function `%s' redefined", name);
3239 f = new(ctx) ir_function(name);
3240 if (!state->symbols->add_function(f)) {
3241 /* This function name shadows a non-function use of the same name. */
3242 YYLTYPE loc = this->get_location();
3244 _mesa_glsl_error(&loc, state, "function name `%s' conflicts with "
3245 "non-function", name);
3249 emit_function(state, f);
3252 /* Verify the return type of main() */
3253 if (strcmp(name, "main") == 0) {
3254 if (! return_type->is_void()) {
3255 YYLTYPE loc = this->get_location();
3257 _mesa_glsl_error(& loc, state, "main() must return void");
3260 if (!hir_parameters.is_empty()) {
3261 YYLTYPE loc = this->get_location();
3263 _mesa_glsl_error(& loc, state, "main() must not take any parameters");
3267 /* Finish storing the information about this new function in its signature.
3270 sig = new(ctx) ir_function_signature(return_type);
3271 f->add_signature(sig);
3274 sig->replace_parameters(&hir_parameters);
3277 /* Function declarations (prototypes) do not have r-values.
3284 ast_function_definition::hir(exec_list *instructions,
3285 struct _mesa_glsl_parse_state *state)
3287 prototype->is_definition = true;
3288 prototype->hir(instructions, state);
3290 ir_function_signature *signature = prototype->signature;
3291 if (signature == NULL)
3294 assert(state->current_function == NULL);
3295 state->current_function = signature;
3296 state->found_return = false;
3298 /* Duplicate parameters declared in the prototype as concrete variables.
3299 * Add these to the symbol table.
3301 state->symbols->push_scope();
3302 foreach_iter(exec_list_iterator, iter, signature->parameters) {
3303 ir_variable *const var = ((ir_instruction *) iter.get())->as_variable();
3305 assert(var != NULL);
3307 /* The only way a parameter would "exist" is if two parameters have
3310 if (state->symbols->name_declared_this_scope(var->name)) {
3311 YYLTYPE loc = this->get_location();
3313 _mesa_glsl_error(& loc, state, "parameter `%s' redeclared", var->name);
3315 state->symbols->add_variable(var);
3319 /* Convert the body of the function to HIR. */
3320 this->body->hir(&signature->body, state);
3321 signature->is_defined = true;
3323 state->symbols->pop_scope();
3325 assert(state->current_function == signature);
3326 state->current_function = NULL;
3328 if (!signature->return_type->is_void() && !state->found_return) {
3329 YYLTYPE loc = this->get_location();
3330 _mesa_glsl_error(& loc, state, "function `%s' has non-void return type "
3331 "%s, but no return statement",
3332 signature->function_name(),
3333 signature->return_type->name);
3336 /* Function definitions do not have r-values.
3343 ast_jump_statement::hir(exec_list *instructions,
3344 struct _mesa_glsl_parse_state *state)
3351 assert(state->current_function);
3353 if (opt_return_value) {
3354 ir_rvalue *const ret = opt_return_value->hir(instructions, state);
3356 /* The value of the return type can be NULL if the shader says
3357 * 'return foo();' and foo() is a function that returns void.
3359 * NOTE: The GLSL spec doesn't say that this is an error. The type
3360 * of the return value is void. If the return type of the function is
3361 * also void, then this should compile without error. Seriously.
3363 const glsl_type *const ret_type =
3364 (ret == NULL) ? glsl_type::void_type : ret->type;
3366 /* Implicit conversions are not allowed for return values. */
3367 if (state->current_function->return_type != ret_type) {
3368 YYLTYPE loc = this->get_location();
3370 _mesa_glsl_error(& loc, state,
3371 "`return' with wrong type %s, in function `%s' "
3374 state->current_function->function_name(),
3375 state->current_function->return_type->name);
3378 inst = new(ctx) ir_return(ret);
3380 if (state->current_function->return_type->base_type !=
3382 YYLTYPE loc = this->get_location();
3384 _mesa_glsl_error(& loc, state,
3385 "`return' with no value, in function %s returning "
3387 state->current_function->function_name());
3389 inst = new(ctx) ir_return;
3392 state->found_return = true;
3393 instructions->push_tail(inst);
3398 if (state->target != fragment_shader) {
3399 YYLTYPE loc = this->get_location();
3401 _mesa_glsl_error(& loc, state,
3402 "`discard' may only appear in a fragment shader");
3404 instructions->push_tail(new(ctx) ir_discard);
3409 if (mode == ast_continue &&
3410 state->loop_nesting_ast == NULL) {
3411 YYLTYPE loc = this->get_location();
3413 _mesa_glsl_error(& loc, state,
3414 "continue may only appear in a loop");
3415 } else if (mode == ast_break &&
3416 state->loop_nesting_ast == NULL &&
3417 state->switch_state.switch_nesting_ast == NULL) {
3418 YYLTYPE loc = this->get_location();
3420 _mesa_glsl_error(& loc, state,
3421 "break may only appear in a loop or a switch");
3423 /* For a loop, inline the for loop expression again,
3424 * since we don't know where near the end of
3425 * the loop body the normal copy of it
3426 * is going to be placed.
3428 if (state->loop_nesting_ast != NULL &&
3429 mode == ast_continue &&
3430 state->loop_nesting_ast->rest_expression) {
3431 state->loop_nesting_ast->rest_expression->hir(instructions,
3435 if (state->switch_state.is_switch_innermost &&
3436 mode == ast_break) {
3437 /* Force break out of switch by setting is_break switch state.
3439 ir_variable *const is_break_var = state->switch_state.is_break_var;
3440 ir_dereference_variable *const deref_is_break_var =
3441 new(ctx) ir_dereference_variable(is_break_var);
3442 ir_constant *const true_val = new(ctx) ir_constant(true);
3443 ir_assignment *const set_break_var =
3444 new(ctx) ir_assignment(deref_is_break_var, true_val);
3446 instructions->push_tail(set_break_var);
3449 ir_loop_jump *const jump =
3450 new(ctx) ir_loop_jump((mode == ast_break)
3451 ? ir_loop_jump::jump_break
3452 : ir_loop_jump::jump_continue);
3453 instructions->push_tail(jump);
3460 /* Jump instructions do not have r-values.
3467 ast_selection_statement::hir(exec_list *instructions,
3468 struct _mesa_glsl_parse_state *state)
3472 ir_rvalue *const condition = this->condition->hir(instructions, state);
3474 /* From page 66 (page 72 of the PDF) of the GLSL 1.50 spec:
3476 * "Any expression whose type evaluates to a Boolean can be used as the
3477 * conditional expression bool-expression. Vector types are not accepted
3478 * as the expression to if."
3480 * The checks are separated so that higher quality diagnostics can be
3481 * generated for cases where both rules are violated.
3483 if (!condition->type->is_boolean() || !condition->type->is_scalar()) {
3484 YYLTYPE loc = this->condition->get_location();
3486 _mesa_glsl_error(& loc, state, "if-statement condition must be scalar "
3490 ir_if *const stmt = new(ctx) ir_if(condition);
3492 if (then_statement != NULL) {
3493 state->symbols->push_scope();
3494 then_statement->hir(& stmt->then_instructions, state);
3495 state->symbols->pop_scope();
3498 if (else_statement != NULL) {
3499 state->symbols->push_scope();
3500 else_statement->hir(& stmt->else_instructions, state);
3501 state->symbols->pop_scope();
3504 instructions->push_tail(stmt);
3506 /* if-statements do not have r-values.
3513 ast_switch_statement::hir(exec_list *instructions,
3514 struct _mesa_glsl_parse_state *state)
3518 ir_rvalue *const test_expression =
3519 this->test_expression->hir(instructions, state);
3521 /* From page 66 (page 55 of the PDF) of the GLSL 1.50 spec:
3523 * "The type of init-expression in a switch statement must be a
3526 if (!test_expression->type->is_scalar() ||
3527 !test_expression->type->is_integer()) {
3528 YYLTYPE loc = this->test_expression->get_location();
3530 _mesa_glsl_error(& loc,
3532 "switch-statement expression must be scalar "
3536 /* Track the switch-statement nesting in a stack-like manner.
3538 struct glsl_switch_state saved = state->switch_state;
3540 state->switch_state.is_switch_innermost = true;
3541 state->switch_state.switch_nesting_ast = this;
3542 state->switch_state.labels_ht = hash_table_ctor(0, hash_table_pointer_hash,
3543 hash_table_pointer_compare);
3544 state->switch_state.previous_default = NULL;
3546 /* Initalize is_fallthru state to false.
3548 ir_rvalue *const is_fallthru_val = new (ctx) ir_constant(false);
3549 state->switch_state.is_fallthru_var =
3550 new(ctx) ir_variable(glsl_type::bool_type,
3551 "switch_is_fallthru_tmp",
3553 instructions->push_tail(state->switch_state.is_fallthru_var);
3555 ir_dereference_variable *deref_is_fallthru_var =
3556 new(ctx) ir_dereference_variable(state->switch_state.is_fallthru_var);
3557 instructions->push_tail(new(ctx) ir_assignment(deref_is_fallthru_var,
3560 /* Initalize is_break state to false.
3562 ir_rvalue *const is_break_val = new (ctx) ir_constant(false);
3563 state->switch_state.is_break_var = new(ctx) ir_variable(glsl_type::bool_type,
3564 "switch_is_break_tmp",
3566 instructions->push_tail(state->switch_state.is_break_var);
3568 ir_dereference_variable *deref_is_break_var =
3569 new(ctx) ir_dereference_variable(state->switch_state.is_break_var);
3570 instructions->push_tail(new(ctx) ir_assignment(deref_is_break_var,
3573 /* Cache test expression.
3575 test_to_hir(instructions, state);
3577 /* Emit code for body of switch stmt.
3579 body->hir(instructions, state);
3581 hash_table_dtor(state->switch_state.labels_ht);
3583 state->switch_state = saved;
3585 /* Switch statements do not have r-values. */
3591 ast_switch_statement::test_to_hir(exec_list *instructions,
3592 struct _mesa_glsl_parse_state *state)
3596 /* Cache value of test expression. */
3597 ir_rvalue *const test_val =
3598 test_expression->hir(instructions,
3601 state->switch_state.test_var = new(ctx) ir_variable(test_val->type,
3604 ir_dereference_variable *deref_test_var =
3605 new(ctx) ir_dereference_variable(state->switch_state.test_var);
3607 instructions->push_tail(state->switch_state.test_var);
3608 instructions->push_tail(new(ctx) ir_assignment(deref_test_var, test_val));
3613 ast_switch_body::hir(exec_list *instructions,
3614 struct _mesa_glsl_parse_state *state)
3617 stmts->hir(instructions, state);
3619 /* Switch bodies do not have r-values. */
3624 ast_case_statement_list::hir(exec_list *instructions,
3625 struct _mesa_glsl_parse_state *state)
3627 foreach_list_typed (ast_case_statement, case_stmt, link, & this->cases)
3628 case_stmt->hir(instructions, state);
3630 /* Case statements do not have r-values. */
3635 ast_case_statement::hir(exec_list *instructions,
3636 struct _mesa_glsl_parse_state *state)
3638 labels->hir(instructions, state);
3640 /* Conditionally set fallthru state based on break state. */
3641 ir_constant *const false_val = new(state) ir_constant(false);
3642 ir_dereference_variable *const deref_is_fallthru_var =
3643 new(state) ir_dereference_variable(state->switch_state.is_fallthru_var);
3644 ir_dereference_variable *const deref_is_break_var =
3645 new(state) ir_dereference_variable(state->switch_state.is_break_var);
3646 ir_assignment *const reset_fallthru_on_break =
3647 new(state) ir_assignment(deref_is_fallthru_var,
3649 deref_is_break_var);
3650 instructions->push_tail(reset_fallthru_on_break);
3652 /* Guard case statements depending on fallthru state. */
3653 ir_dereference_variable *const deref_fallthru_guard =
3654 new(state) ir_dereference_variable(state->switch_state.is_fallthru_var);
3655 ir_if *const test_fallthru = new(state) ir_if(deref_fallthru_guard);
3657 foreach_list_typed (ast_node, stmt, link, & this->stmts)
3658 stmt->hir(& test_fallthru->then_instructions, state);
3660 instructions->push_tail(test_fallthru);
3662 /* Case statements do not have r-values. */
3668 ast_case_label_list::hir(exec_list *instructions,
3669 struct _mesa_glsl_parse_state *state)
3671 foreach_list_typed (ast_case_label, label, link, & this->labels)
3672 label->hir(instructions, state);
3674 /* Case labels do not have r-values. */
3679 ast_case_label::hir(exec_list *instructions,
3680 struct _mesa_glsl_parse_state *state)
3684 ir_dereference_variable *deref_fallthru_var =
3685 new(ctx) ir_dereference_variable(state->switch_state.is_fallthru_var);
3687 ir_rvalue *const true_val = new(ctx) ir_constant(true);
3689 /* If not default case, ... */
3690 if (this->test_value != NULL) {
3691 /* Conditionally set fallthru state based on
3692 * comparison of cached test expression value to case label.
3694 ir_rvalue *const label_rval = this->test_value->hir(instructions, state);
3695 ir_constant *label_const = label_rval->constant_expression_value();
3698 YYLTYPE loc = this->test_value->get_location();
3700 _mesa_glsl_error(& loc, state,
3701 "switch statement case label must be a "
3702 "constant expression");
3704 /* Stuff a dummy value in to allow processing to continue. */
3705 label_const = new(ctx) ir_constant(0);
3707 ast_expression *previous_label = (ast_expression *)
3708 hash_table_find(state->switch_state.labels_ht,
3709 (void *)(uintptr_t)label_const->value.u[0]);
3711 if (previous_label) {
3712 YYLTYPE loc = this->test_value->get_location();
3713 _mesa_glsl_error(& loc, state,
3714 "duplicate case value");
3716 loc = previous_label->get_location();
3717 _mesa_glsl_error(& loc, state,
3718 "this is the previous case label");
3720 hash_table_insert(state->switch_state.labels_ht,
3722 (void *)(uintptr_t)label_const->value.u[0]);
3726 ir_dereference_variable *deref_test_var =
3727 new(ctx) ir_dereference_variable(state->switch_state.test_var);
3729 ir_rvalue *const test_cond = new(ctx) ir_expression(ir_binop_all_equal,
3733 ir_assignment *set_fallthru_on_test =
3734 new(ctx) ir_assignment(deref_fallthru_var,
3738 instructions->push_tail(set_fallthru_on_test);
3739 } else { /* default case */
3740 if (state->switch_state.previous_default) {
3741 YYLTYPE loc = this->get_location();
3742 _mesa_glsl_error(& loc, state,
3743 "multiple default labels in one switch");
3745 loc = state->switch_state.previous_default->get_location();
3746 _mesa_glsl_error(& loc, state,
3747 "this is the first default label");
3749 state->switch_state.previous_default = this;
3751 /* Set falltrhu state. */
3752 ir_assignment *set_fallthru =
3753 new(ctx) ir_assignment(deref_fallthru_var, true_val);
3755 instructions->push_tail(set_fallthru);
3758 /* Case statements do not have r-values. */
3763 ast_iteration_statement::condition_to_hir(ir_loop *stmt,
3764 struct _mesa_glsl_parse_state *state)
3768 if (condition != NULL) {
3769 ir_rvalue *const cond =
3770 condition->hir(& stmt->body_instructions, state);
3773 || !cond->type->is_boolean() || !cond->type->is_scalar()) {
3774 YYLTYPE loc = condition->get_location();
3776 _mesa_glsl_error(& loc, state,
3777 "loop condition must be scalar boolean");
3779 /* As the first code in the loop body, generate a block that looks
3780 * like 'if (!condition) break;' as the loop termination condition.
3782 ir_rvalue *const not_cond =
3783 new(ctx) ir_expression(ir_unop_logic_not, cond);
3785 ir_if *const if_stmt = new(ctx) ir_if(not_cond);
3787 ir_jump *const break_stmt =
3788 new(ctx) ir_loop_jump(ir_loop_jump::jump_break);
3790 if_stmt->then_instructions.push_tail(break_stmt);
3791 stmt->body_instructions.push_tail(if_stmt);
3798 ast_iteration_statement::hir(exec_list *instructions,
3799 struct _mesa_glsl_parse_state *state)
3803 /* For-loops and while-loops start a new scope, but do-while loops do not.
3805 if (mode != ast_do_while)
3806 state->symbols->push_scope();
3808 if (init_statement != NULL)
3809 init_statement->hir(instructions, state);
3811 ir_loop *const stmt = new(ctx) ir_loop();
3812 instructions->push_tail(stmt);
3814 /* Track the current loop nesting. */
3815 ast_iteration_statement *nesting_ast = state->loop_nesting_ast;
3817 state->loop_nesting_ast = this;
3819 /* Likewise, indicate that following code is closest to a loop,
3820 * NOT closest to a switch.
3822 bool saved_is_switch_innermost = state->switch_state.is_switch_innermost;
3823 state->switch_state.is_switch_innermost = false;
3825 if (mode != ast_do_while)
3826 condition_to_hir(stmt, state);
3829 body->hir(& stmt->body_instructions, state);
3831 if (rest_expression != NULL)
3832 rest_expression->hir(& stmt->body_instructions, state);
3834 if (mode == ast_do_while)
3835 condition_to_hir(stmt, state);
3837 if (mode != ast_do_while)
3838 state->symbols->pop_scope();
3840 /* Restore previous nesting before returning. */
3841 state->loop_nesting_ast = nesting_ast;
3842 state->switch_state.is_switch_innermost = saved_is_switch_innermost;
3844 /* Loops do not have r-values.
3851 ast_type_specifier::hir(exec_list *instructions,
3852 struct _mesa_glsl_parse_state *state)
3854 if (!this->is_precision_statement && this->structure == NULL)
3857 YYLTYPE loc = this->get_location();
3859 if (this->precision != ast_precision_none
3860 && state->language_version != 100
3861 && state->language_version < 130) {
3862 _mesa_glsl_error(&loc, state,
3863 "precision qualifiers exist only in "
3864 "GLSL ES 1.00, and GLSL 1.30 and later");
3867 if (this->precision != ast_precision_none
3868 && this->structure != NULL) {
3869 _mesa_glsl_error(&loc, state,
3870 "precision qualifiers do not apply to structures");
3874 /* If this is a precision statement, check that the type to which it is
3875 * applied is either float or int.
3877 * From section 4.5.3 of the GLSL 1.30 spec:
3878 * "The precision statement
3879 * precision precision-qualifier type;
3880 * can be used to establish a default precision qualifier. The type
3881 * field can be either int or float [...]. Any other types or
3882 * qualifiers will result in an error.
3884 if (this->is_precision_statement) {
3885 assert(this->precision != ast_precision_none);
3886 assert(this->structure == NULL); /* The check for structures was
3887 * performed above. */
3888 if (this->is_array) {
3889 _mesa_glsl_error(&loc, state,
3890 "default precision statements do not apply to "
3894 if (strcmp(this->type_name, "float") != 0 &&
3895 strcmp(this->type_name, "int") != 0) {
3896 _mesa_glsl_error(&loc, state,
3897 "default precision statements apply only to types "
3902 /* FINISHME: Translate precision statements into IR. */
3906 if (this->structure != NULL)
3907 return this->structure->hir(instructions, state);
3914 ast_struct_specifier::hir(exec_list *instructions,
3915 struct _mesa_glsl_parse_state *state)
3917 unsigned decl_count = 0;
3919 /* Make an initial pass over the list of structure fields to determine how
3920 * many there are. Each element in this list is an ast_declarator_list.
3921 * This means that we actually need to count the number of elements in the
3922 * 'declarations' list in each of the elements.
3924 foreach_list_typed (ast_declarator_list, decl_list, link,
3925 &this->declarations) {
3926 foreach_list_const (decl_ptr, & decl_list->declarations) {
3931 /* Allocate storage for the structure fields and process the field
3932 * declarations. As the declarations are processed, try to also convert
3933 * the types to HIR. This ensures that structure definitions embedded in
3934 * other structure definitions are processed.
3936 glsl_struct_field *const fields = ralloc_array(state, glsl_struct_field,
3940 foreach_list_typed (ast_declarator_list, decl_list, link,
3941 &this->declarations) {
3942 const char *type_name;
3944 decl_list->type->specifier->hir(instructions, state);
3946 /* Section 10.9 of the GLSL ES 1.00 specification states that
3947 * embedded structure definitions have been removed from the language.
3949 if (state->es_shader && decl_list->type->specifier->structure != NULL) {
3950 YYLTYPE loc = this->get_location();
3951 _mesa_glsl_error(&loc, state, "Embedded structure definitions are "
3952 "not allowed in GLSL ES 1.00.");
3955 const glsl_type *decl_type =
3956 decl_list->type->specifier->glsl_type(& type_name, state);
3958 foreach_list_typed (ast_declaration, decl, link,
3959 &decl_list->declarations) {
3960 const struct glsl_type *field_type = decl_type;
3961 if (decl->is_array) {
3962 YYLTYPE loc = decl->get_location();
3963 field_type = process_array_type(&loc, decl_type, decl->array_size,
3966 fields[i].type = (field_type != NULL)
3967 ? field_type : glsl_type::error_type;
3968 fields[i].name = decl->identifier;
3973 assert(i == decl_count);
3975 const glsl_type *t =
3976 glsl_type::get_record_instance(fields, decl_count, this->name);
3978 YYLTYPE loc = this->get_location();
3979 if (!state->symbols->add_type(name, t)) {
3980 _mesa_glsl_error(& loc, state, "struct `%s' previously defined", name);
3982 const glsl_type **s = reralloc(state, state->user_structures,
3984 state->num_user_structures + 1);
3986 s[state->num_user_structures] = t;
3987 state->user_structures = s;
3988 state->num_user_structures++;
3992 /* Structure type definitions do not have r-values.
3997 static struct gl_uniform_block *
3998 get_next_uniform_block(struct _mesa_glsl_parse_state *state)
4000 if (state->num_uniform_blocks >= state->uniform_block_array_size) {
4001 state->uniform_block_array_size *= 2;
4002 if (state->uniform_block_array_size <= 4)
4003 state->uniform_block_array_size = 4;
4005 state->uniform_blocks = reralloc(state,
4006 state->uniform_blocks,
4007 struct gl_uniform_block,
4008 state->uniform_block_array_size);
4011 memset(&state->uniform_blocks[state->num_uniform_blocks],
4012 0, sizeof(*state->uniform_blocks));
4013 return &state->uniform_blocks[state->num_uniform_blocks++];
4017 ast_uniform_block::hir(exec_list *instructions,
4018 struct _mesa_glsl_parse_state *state)
4020 /* The ast_uniform_block has a list of ast_declarator_lists. We
4021 * need to turn those into ir_variables with an association
4022 * with this uniform block.
4024 struct gl_uniform_block *ubo = get_next_uniform_block(state);
4025 ubo->Name = ralloc_strdup(state->uniform_blocks, this->block_name);
4027 unsigned int num_variables = 0;
4028 foreach_list_typed(ast_declarator_list, decl_list, link, &declarations) {
4029 foreach_list_const(node, &decl_list->declarations) {
4034 bool block_row_major = this->layout.flags.q.row_major;
4036 ubo->Uniforms = rzalloc_array(state->uniform_blocks,
4037 struct gl_uniform_buffer_variable,
4040 foreach_list_typed(ast_declarator_list, decl_list, link, &declarations) {
4041 exec_list declared_variables;
4043 decl_list->hir(&declared_variables, state);
4045 foreach_list_const(node, &declared_variables) {
4046 struct ir_variable *var = (ir_variable *)node;
4048 struct gl_uniform_buffer_variable *ubo_var =
4049 &ubo->Uniforms[ubo->NumUniforms++];
4051 var->uniform_block = ubo - state->uniform_blocks;
4053 ubo_var->Name = ralloc_strdup(state->uniform_blocks, var->name);
4054 ubo_var->Type = var->type;
4055 ubo_var->Buffer = ubo - state->uniform_blocks;
4056 ubo_var->Offset = 0; /* Assigned at link time. */
4057 ubo_var->RowMajor = block_row_major;
4058 if (decl_list->type->qualifier.flags.q.row_major)
4059 ubo_var->RowMajor = true;
4060 else if (decl_list->type->qualifier.flags.q.column_major)
4061 ubo_var->RowMajor = false;
4063 /* From the GL_ARB_uniform_buffer_object spec:
4065 * "Sampler types are not allowed inside of uniform
4066 * blocks. All other types, arrays, and structures
4067 * allowed for uniforms are allowed within a uniform
4070 if (var->type->contains_sampler()) {
4071 YYLTYPE loc = decl_list->get_location();
4072 _mesa_glsl_error(&loc, state,
4073 "Uniform in non-default uniform block contains sampler\n");
4077 instructions->append_list(&declared_variables);
4084 detect_conflicting_assignments(struct _mesa_glsl_parse_state *state,
4085 exec_list *instructions)
4087 bool gl_FragColor_assigned = false;
4088 bool gl_FragData_assigned = false;
4089 bool user_defined_fs_output_assigned = false;
4090 ir_variable *user_defined_fs_output = NULL;
4092 /* It would be nice to have proper location information. */
4094 memset(&loc, 0, sizeof(loc));
4096 foreach_list(node, instructions) {
4097 ir_variable *var = ((ir_instruction *)node)->as_variable();
4099 if (!var || !var->assigned)
4102 if (strcmp(var->name, "gl_FragColor") == 0)
4103 gl_FragColor_assigned = true;
4104 else if (strcmp(var->name, "gl_FragData") == 0)
4105 gl_FragData_assigned = true;
4106 else if (strncmp(var->name, "gl_", 3) != 0) {
4107 if (state->target == fragment_shader &&
4108 (var->mode == ir_var_out || var->mode == ir_var_inout)) {
4109 user_defined_fs_output_assigned = true;
4110 user_defined_fs_output = var;
4115 /* From the GLSL 1.30 spec:
4117 * "If a shader statically assigns a value to gl_FragColor, it
4118 * may not assign a value to any element of gl_FragData. If a
4119 * shader statically writes a value to any element of
4120 * gl_FragData, it may not assign a value to
4121 * gl_FragColor. That is, a shader may assign values to either
4122 * gl_FragColor or gl_FragData, but not both. Multiple shaders
4123 * linked together must also consistently write just one of
4124 * these variables. Similarly, if user declared output
4125 * variables are in use (statically assigned to), then the
4126 * built-in variables gl_FragColor and gl_FragData may not be
4127 * assigned to. These incorrect usages all generate compile
4130 if (gl_FragColor_assigned && gl_FragData_assigned) {
4131 _mesa_glsl_error(&loc, state, "fragment shader writes to both "
4132 "`gl_FragColor' and `gl_FragData'\n");
4133 } else if (gl_FragColor_assigned && user_defined_fs_output_assigned) {
4134 _mesa_glsl_error(&loc, state, "fragment shader writes to both "
4135 "`gl_FragColor' and `%s'\n",
4136 user_defined_fs_output->name);
4137 } else if (gl_FragData_assigned && user_defined_fs_output_assigned) {
4138 _mesa_glsl_error(&loc, state, "fragment shader writes to both "
4139 "`gl_FragData' and `%s'\n",
4140 user_defined_fs_output->name);