2 * Copyright © 2010 Intel Corporation
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
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11 * The above copyright notice and this permission notice (including the next
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15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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21 * DEALINGS IN THE SOFTWARE.
26 * Convert abstract syntax to to high-level intermediate reprensentation (HIR).
28 * During the conversion to HIR, the majority of the symantic checking is
29 * preformed on the program. This includes:
31 * * Symbol table management
35 * The majority of this work could be done during parsing, and the parser could
36 * probably generate HIR directly. However, this results in frequent changes
37 * to the parser code. Since we do not assume that every system this complier
38 * is built on will have Flex and Bison installed, we have to store the code
39 * generated by these tools in our version control system. In other parts of
40 * the system we've seen problems where a parser was changed but the generated
41 * code was not committed, merge conflicts where created because two developers
42 * had slightly different versions of Bison installed, etc.
44 * I have also noticed that running Bison generated parsers in GDB is very
45 * irritating. When you get a segfault on '$$ = $1->foo', you can't very
46 * well 'print $1' in GDB.
48 * As a result, my preference is to put as little C code as possible in the
49 * parser (and lexer) sources.
52 #include "main/core.h" /* for struct gl_extensions */
53 #include "glsl_symbol_table.h"
54 #include "glsl_parser_extras.h"
56 #include "glsl_types.h"
60 _mesa_ast_to_hir(exec_list *instructions, struct _mesa_glsl_parse_state *state)
62 _mesa_glsl_initialize_variables(instructions, state);
63 _mesa_glsl_initialize_functions(state);
65 state->symbols->language_version = state->language_version;
67 state->current_function = NULL;
69 /* Section 4.2 of the GLSL 1.20 specification states:
70 * "The built-in functions are scoped in a scope outside the global scope
71 * users declare global variables in. That is, a shader's global scope,
72 * available for user-defined functions and global variables, is nested
73 * inside the scope containing the built-in functions."
75 * Since built-in functions like ftransform() access built-in variables,
76 * it follows that those must be in the outer scope as well.
78 * We push scope here to create this nesting effect...but don't pop.
79 * This way, a shader's globals are still in the symbol table for use
82 state->symbols->push_scope();
84 foreach_list_typed (ast_node, ast, link, & state->translation_unit)
85 ast->hir(instructions, state);
90 * If a conversion is available, convert one operand to a different type
92 * The \c from \c ir_rvalue is converted "in place".
94 * \param to Type that the operand it to be converted to
95 * \param from Operand that is being converted
96 * \param state GLSL compiler state
99 * If a conversion is possible (or unnecessary), \c true is returned.
100 * Otherwise \c false is returned.
103 apply_implicit_conversion(const glsl_type *to, ir_rvalue * &from,
104 struct _mesa_glsl_parse_state *state)
107 if (to->base_type == from->type->base_type)
110 /* This conversion was added in GLSL 1.20. If the compilation mode is
111 * GLSL 1.10, the conversion is skipped.
113 if (state->language_version < 120)
116 /* From page 27 (page 33 of the PDF) of the GLSL 1.50 spec:
118 * "There are no implicit array or structure conversions. For
119 * example, an array of int cannot be implicitly converted to an
120 * array of float. There are no implicit conversions between
121 * signed and unsigned integers."
123 /* FINISHME: The above comment is partially a lie. There is int/uint
124 * FINISHME: conversion for immediate constants.
126 if (!to->is_float() || !from->type->is_numeric())
129 /* Convert to a floating point type with the same number of components
130 * as the original type - i.e. int to float, not int to vec4.
132 to = glsl_type::get_instance(GLSL_TYPE_FLOAT, from->type->vector_elements,
133 from->type->matrix_columns);
135 switch (from->type->base_type) {
137 from = new(ctx) ir_expression(ir_unop_i2f, to, from, NULL);
140 from = new(ctx) ir_expression(ir_unop_u2f, to, from, NULL);
143 from = new(ctx) ir_expression(ir_unop_b2f, to, from, NULL);
153 static const struct glsl_type *
154 arithmetic_result_type(ir_rvalue * &value_a, ir_rvalue * &value_b,
156 struct _mesa_glsl_parse_state *state, YYLTYPE *loc)
158 const glsl_type *type_a = value_a->type;
159 const glsl_type *type_b = value_b->type;
161 /* From GLSL 1.50 spec, page 56:
163 * "The arithmetic binary operators add (+), subtract (-),
164 * multiply (*), and divide (/) operate on integer and
165 * floating-point scalars, vectors, and matrices."
167 if (!type_a->is_numeric() || !type_b->is_numeric()) {
168 _mesa_glsl_error(loc, state,
169 "Operands to arithmetic operators must be numeric");
170 return glsl_type::error_type;
174 /* "If one operand is floating-point based and the other is
175 * not, then the conversions from Section 4.1.10 "Implicit
176 * Conversions" are applied to the non-floating-point-based operand."
178 if (!apply_implicit_conversion(type_a, value_b, state)
179 && !apply_implicit_conversion(type_b, value_a, state)) {
180 _mesa_glsl_error(loc, state,
181 "Could not implicitly convert operands to "
182 "arithmetic operator");
183 return glsl_type::error_type;
185 type_a = value_a->type;
186 type_b = value_b->type;
188 /* "If the operands are integer types, they must both be signed or
191 * From this rule and the preceeding conversion it can be inferred that
192 * both types must be GLSL_TYPE_FLOAT, or GLSL_TYPE_UINT, or GLSL_TYPE_INT.
193 * The is_numeric check above already filtered out the case where either
194 * type is not one of these, so now the base types need only be tested for
197 if (type_a->base_type != type_b->base_type) {
198 _mesa_glsl_error(loc, state,
199 "base type mismatch for arithmetic operator");
200 return glsl_type::error_type;
203 /* "All arithmetic binary operators result in the same fundamental type
204 * (signed integer, unsigned integer, or floating-point) as the
205 * operands they operate on, after operand type conversion. After
206 * conversion, the following cases are valid
208 * * The two operands are scalars. In this case the operation is
209 * applied, resulting in a scalar."
211 if (type_a->is_scalar() && type_b->is_scalar())
214 /* "* One operand is a scalar, and the other is a vector or matrix.
215 * In this case, the scalar operation is applied independently to each
216 * component of the vector or matrix, resulting in the same size
219 if (type_a->is_scalar()) {
220 if (!type_b->is_scalar())
222 } else if (type_b->is_scalar()) {
226 /* All of the combinations of <scalar, scalar>, <vector, scalar>,
227 * <scalar, vector>, <scalar, matrix>, and <matrix, scalar> have been
230 assert(!type_a->is_scalar());
231 assert(!type_b->is_scalar());
233 /* "* The two operands are vectors of the same size. In this case, the
234 * operation is done component-wise resulting in the same size
237 if (type_a->is_vector() && type_b->is_vector()) {
238 if (type_a == type_b) {
241 _mesa_glsl_error(loc, state,
242 "vector size mismatch for arithmetic operator");
243 return glsl_type::error_type;
247 /* All of the combinations of <scalar, scalar>, <vector, scalar>,
248 * <scalar, vector>, <scalar, matrix>, <matrix, scalar>, and
249 * <vector, vector> have been handled. At least one of the operands must
250 * be matrix. Further, since there are no integer matrix types, the base
251 * type of both operands must be float.
253 assert(type_a->is_matrix() || type_b->is_matrix());
254 assert(type_a->base_type == GLSL_TYPE_FLOAT);
255 assert(type_b->base_type == GLSL_TYPE_FLOAT);
257 /* "* The operator is add (+), subtract (-), or divide (/), and the
258 * operands are matrices with the same number of rows and the same
259 * number of columns. In this case, the operation is done component-
260 * wise resulting in the same size matrix."
261 * * The operator is multiply (*), where both operands are matrices or
262 * one operand is a vector and the other a matrix. A right vector
263 * operand is treated as a column vector and a left vector operand as a
264 * row vector. In all these cases, it is required that the number of
265 * columns of the left operand is equal to the number of rows of the
266 * right operand. Then, the multiply (*) operation does a linear
267 * algebraic multiply, yielding an object that has the same number of
268 * rows as the left operand and the same number of columns as the right
269 * operand. Section 5.10 "Vector and Matrix Operations" explains in
270 * more detail how vectors and matrices are operated on."
273 if (type_a == type_b)
276 if (type_a->is_matrix() && type_b->is_matrix()) {
277 /* Matrix multiply. The columns of A must match the rows of B. Given
278 * the other previously tested constraints, this means the vector type
279 * of a row from A must be the same as the vector type of a column from
282 if (type_a->row_type() == type_b->column_type()) {
283 /* The resulting matrix has the number of columns of matrix B and
284 * the number of rows of matrix A. We get the row count of A by
285 * looking at the size of a vector that makes up a column. The
286 * transpose (size of a row) is done for B.
288 const glsl_type *const type =
289 glsl_type::get_instance(type_a->base_type,
290 type_a->column_type()->vector_elements,
291 type_b->row_type()->vector_elements);
292 assert(type != glsl_type::error_type);
296 } else if (type_a->is_matrix()) {
297 /* A is a matrix and B is a column vector. Columns of A must match
298 * rows of B. Given the other previously tested constraints, this
299 * means the vector type of a row from A must be the same as the
300 * vector the type of B.
302 if (type_a->row_type() == type_b) {
303 /* The resulting vector has a number of elements equal to
304 * the number of rows of matrix A. */
305 const glsl_type *const type =
306 glsl_type::get_instance(type_a->base_type,
307 type_a->column_type()->vector_elements,
309 assert(type != glsl_type::error_type);
314 assert(type_b->is_matrix());
316 /* A is a row vector and B is a matrix. Columns of A must match rows
317 * of B. Given the other previously tested constraints, this means
318 * the type of A must be the same as the vector type of a column from
321 if (type_a == type_b->column_type()) {
322 /* The resulting vector has a number of elements equal to
323 * the number of columns of matrix B. */
324 const glsl_type *const type =
325 glsl_type::get_instance(type_a->base_type,
326 type_b->row_type()->vector_elements,
328 assert(type != glsl_type::error_type);
334 _mesa_glsl_error(loc, state, "size mismatch for matrix multiplication");
335 return glsl_type::error_type;
339 /* "All other cases are illegal."
341 _mesa_glsl_error(loc, state, "type mismatch");
342 return glsl_type::error_type;
346 static const struct glsl_type *
347 unary_arithmetic_result_type(const struct glsl_type *type,
348 struct _mesa_glsl_parse_state *state, YYLTYPE *loc)
350 /* From GLSL 1.50 spec, page 57:
352 * "The arithmetic unary operators negate (-), post- and pre-increment
353 * and decrement (-- and ++) operate on integer or floating-point
354 * values (including vectors and matrices). All unary operators work
355 * component-wise on their operands. These result with the same type
358 if (!type->is_numeric()) {
359 _mesa_glsl_error(loc, state,
360 "Operands to arithmetic operators must be numeric");
361 return glsl_type::error_type;
368 * \brief Return the result type of a bit-logic operation.
370 * If the given types to the bit-logic operator are invalid, return
371 * glsl_type::error_type.
373 * \param type_a Type of LHS of bit-logic op
374 * \param type_b Type of RHS of bit-logic op
376 static const struct glsl_type *
377 bit_logic_result_type(const struct glsl_type *type_a,
378 const struct glsl_type *type_b,
380 struct _mesa_glsl_parse_state *state, YYLTYPE *loc)
382 if (state->language_version < 130) {
383 _mesa_glsl_error(loc, state, "bit operations require GLSL 1.30");
384 return glsl_type::error_type;
387 /* From page 50 (page 56 of PDF) of GLSL 1.30 spec:
389 * "The bitwise operators and (&), exclusive-or (^), and inclusive-or
390 * (|). The operands must be of type signed or unsigned integers or
393 if (!type_a->is_integer()) {
394 _mesa_glsl_error(loc, state, "LHS of `%s' must be an integer",
395 ast_expression::operator_string(op));
396 return glsl_type::error_type;
398 if (!type_b->is_integer()) {
399 _mesa_glsl_error(loc, state, "RHS of `%s' must be an integer",
400 ast_expression::operator_string(op));
401 return glsl_type::error_type;
404 /* "The fundamental types of the operands (signed or unsigned) must
407 if (type_a->base_type != type_b->base_type) {
408 _mesa_glsl_error(loc, state, "operands of `%s' must have the same "
409 "base type", ast_expression::operator_string(op));
410 return glsl_type::error_type;
413 /* "The operands cannot be vectors of differing size." */
414 if (type_a->is_vector() &&
415 type_b->is_vector() &&
416 type_a->vector_elements != type_b->vector_elements) {
417 _mesa_glsl_error(loc, state, "operands of `%s' cannot be vectors of "
418 "different sizes", ast_expression::operator_string(op));
419 return glsl_type::error_type;
422 /* "If one operand is a scalar and the other a vector, the scalar is
423 * applied component-wise to the vector, resulting in the same type as
424 * the vector. The fundamental types of the operands [...] will be the
425 * resulting fundamental type."
427 if (type_a->is_scalar())
433 static const struct glsl_type *
434 modulus_result_type(const struct glsl_type *type_a,
435 const struct glsl_type *type_b,
436 struct _mesa_glsl_parse_state *state, YYLTYPE *loc)
438 if (state->language_version < 130) {
439 _mesa_glsl_error(loc, state,
440 "operator '%%' is reserved in %s",
441 state->version_string);
442 return glsl_type::error_type;
445 /* From GLSL 1.50 spec, page 56:
446 * "The operator modulus (%) operates on signed or unsigned integers or
447 * integer vectors. The operand types must both be signed or both be
450 if (!type_a->is_integer() || !type_b->is_integer()
451 || (type_a->base_type != type_b->base_type)) {
452 _mesa_glsl_error(loc, state, "type mismatch");
453 return glsl_type::error_type;
456 /* "The operands cannot be vectors of differing size. If one operand is
457 * a scalar and the other vector, then the scalar is applied component-
458 * wise to the vector, resulting in the same type as the vector. If both
459 * are vectors of the same size, the result is computed component-wise."
461 if (type_a->is_vector()) {
462 if (!type_b->is_vector()
463 || (type_a->vector_elements == type_b->vector_elements))
468 /* "The operator modulus (%) is not defined for any other data types
469 * (non-integer types)."
471 _mesa_glsl_error(loc, state, "type mismatch");
472 return glsl_type::error_type;
476 static const struct glsl_type *
477 relational_result_type(ir_rvalue * &value_a, ir_rvalue * &value_b,
478 struct _mesa_glsl_parse_state *state, YYLTYPE *loc)
480 const glsl_type *type_a = value_a->type;
481 const glsl_type *type_b = value_b->type;
483 /* From GLSL 1.50 spec, page 56:
484 * "The relational operators greater than (>), less than (<), greater
485 * than or equal (>=), and less than or equal (<=) operate only on
486 * scalar integer and scalar floating-point expressions."
488 if (!type_a->is_numeric()
489 || !type_b->is_numeric()
490 || !type_a->is_scalar()
491 || !type_b->is_scalar()) {
492 _mesa_glsl_error(loc, state,
493 "Operands to relational operators must be scalar and "
495 return glsl_type::error_type;
498 /* "Either the operands' types must match, or the conversions from
499 * Section 4.1.10 "Implicit Conversions" will be applied to the integer
500 * operand, after which the types must match."
502 if (!apply_implicit_conversion(type_a, value_b, state)
503 && !apply_implicit_conversion(type_b, value_a, state)) {
504 _mesa_glsl_error(loc, state,
505 "Could not implicitly convert operands to "
506 "relational operator");
507 return glsl_type::error_type;
509 type_a = value_a->type;
510 type_b = value_b->type;
512 if (type_a->base_type != type_b->base_type) {
513 _mesa_glsl_error(loc, state, "base type mismatch");
514 return glsl_type::error_type;
517 /* "The result is scalar Boolean."
519 return glsl_type::bool_type;
523 * \brief Return the result type of a bit-shift operation.
525 * If the given types to the bit-shift operator are invalid, return
526 * glsl_type::error_type.
528 * \param type_a Type of LHS of bit-shift op
529 * \param type_b Type of RHS of bit-shift op
531 static const struct glsl_type *
532 shift_result_type(const struct glsl_type *type_a,
533 const struct glsl_type *type_b,
535 struct _mesa_glsl_parse_state *state, YYLTYPE *loc)
537 if (state->language_version < 130) {
538 _mesa_glsl_error(loc, state, "bit operations require GLSL 1.30");
539 return glsl_type::error_type;
542 /* From page 50 (page 56 of the PDF) of the GLSL 1.30 spec:
544 * "The shift operators (<<) and (>>). For both operators, the operands
545 * must be signed or unsigned integers or integer vectors. One operand
546 * can be signed while the other is unsigned."
548 if (!type_a->is_integer()) {
549 _mesa_glsl_error(loc, state, "LHS of operator %s must be an integer or "
550 "integer vector", ast_expression::operator_string(op));
551 return glsl_type::error_type;
554 if (!type_b->is_integer()) {
555 _mesa_glsl_error(loc, state, "RHS of operator %s must be an integer or "
556 "integer vector", ast_expression::operator_string(op));
557 return glsl_type::error_type;
560 /* "If the first operand is a scalar, the second operand has to be
563 if (type_a->is_scalar() && !type_b->is_scalar()) {
564 _mesa_glsl_error(loc, state, "If the first operand of %s is scalar, the "
565 "second must be scalar as well",
566 ast_expression::operator_string(op));
567 return glsl_type::error_type;
570 /* If both operands are vectors, check that they have same number of
573 if (type_a->is_vector() &&
574 type_b->is_vector() &&
575 type_a->vector_elements != type_b->vector_elements) {
576 _mesa_glsl_error(loc, state, "Vector operands to operator %s must "
577 "have same number of elements",
578 ast_expression::operator_string(op));
579 return glsl_type::error_type;
582 /* "In all cases, the resulting type will be the same type as the left
589 * Validates that a value can be assigned to a location with a specified type
591 * Validates that \c rhs can be assigned to some location. If the types are
592 * not an exact match but an automatic conversion is possible, \c rhs will be
596 * \c NULL if \c rhs cannot be assigned to a location with type \c lhs_type.
597 * Otherwise the actual RHS to be assigned will be returned. This may be
598 * \c rhs, or it may be \c rhs after some type conversion.
601 * In addition to being used for assignments, this function is used to
602 * type-check return values.
605 validate_assignment(struct _mesa_glsl_parse_state *state,
606 const glsl_type *lhs_type, ir_rvalue *rhs,
609 /* If there is already some error in the RHS, just return it. Anything
610 * else will lead to an avalanche of error message back to the user.
612 if (rhs->type->is_error())
615 /* If the types are identical, the assignment can trivially proceed.
617 if (rhs->type == lhs_type)
620 /* If the array element types are the same and the size of the LHS is zero,
621 * the assignment is okay for initializers embedded in variable
624 * Note: Whole-array assignments are not permitted in GLSL 1.10, but this
625 * is handled by ir_dereference::is_lvalue.
627 if (is_initializer && lhs_type->is_array() && rhs->type->is_array()
628 && (lhs_type->element_type() == rhs->type->element_type())
629 && (lhs_type->array_size() == 0)) {
633 /* Check for implicit conversion in GLSL 1.20 */
634 if (apply_implicit_conversion(lhs_type, rhs, state)) {
635 if (rhs->type == lhs_type)
643 do_assignment(exec_list *instructions, struct _mesa_glsl_parse_state *state,
644 ir_rvalue *lhs, ir_rvalue *rhs, bool is_initializer,
648 bool error_emitted = (lhs->type->is_error() || rhs->type->is_error());
650 if (!error_emitted) {
651 if (lhs->variable_referenced() != NULL
652 && lhs->variable_referenced()->read_only) {
653 _mesa_glsl_error(&lhs_loc, state,
654 "assignment to read-only variable '%s'",
655 lhs->variable_referenced()->name);
656 error_emitted = true;
658 } else if (!lhs->is_lvalue()) {
659 _mesa_glsl_error(& lhs_loc, state, "non-lvalue in assignment");
660 error_emitted = true;
663 if (state->es_shader && lhs->type->is_array()) {
664 _mesa_glsl_error(&lhs_loc, state, "whole array assignment is not "
665 "allowed in GLSL ES 1.00.");
666 error_emitted = true;
671 validate_assignment(state, lhs->type, rhs, is_initializer);
672 if (new_rhs == NULL) {
673 _mesa_glsl_error(& lhs_loc, state, "type mismatch");
677 /* If the LHS array was not declared with a size, it takes it size from
678 * the RHS. If the LHS is an l-value and a whole array, it must be a
679 * dereference of a variable. Any other case would require that the LHS
680 * is either not an l-value or not a whole array.
682 if (lhs->type->array_size() == 0) {
683 ir_dereference *const d = lhs->as_dereference();
687 ir_variable *const var = d->variable_referenced();
691 if (var->max_array_access >= unsigned(rhs->type->array_size())) {
692 /* FINISHME: This should actually log the location of the RHS. */
693 _mesa_glsl_error(& lhs_loc, state, "array size must be > %u due to "
695 var->max_array_access);
698 var->type = glsl_type::get_array_instance(lhs->type->element_type(),
699 rhs->type->array_size());
704 /* Most callers of do_assignment (assign, add_assign, pre_inc/dec,
705 * but not post_inc) need the converted assigned value as an rvalue
706 * to handle things like:
710 * So we always just store the computed value being assigned to a
711 * temporary and return a deref of that temporary. If the rvalue
712 * ends up not being used, the temp will get copy-propagated out.
714 ir_variable *var = new(ctx) ir_variable(rhs->type, "assignment_tmp",
716 ir_dereference_variable *deref_var = new(ctx) ir_dereference_variable(var);
717 instructions->push_tail(var);
718 instructions->push_tail(new(ctx) ir_assignment(deref_var,
721 deref_var = new(ctx) ir_dereference_variable(var);
724 instructions->push_tail(new(ctx) ir_assignment(lhs, deref_var, NULL));
726 return new(ctx) ir_dereference_variable(var);
730 get_lvalue_copy(exec_list *instructions, ir_rvalue *lvalue)
732 void *ctx = ralloc_parent(lvalue);
735 var = new(ctx) ir_variable(lvalue->type, "_post_incdec_tmp",
737 instructions->push_tail(var);
738 var->mode = ir_var_auto;
740 instructions->push_tail(new(ctx) ir_assignment(new(ctx) ir_dereference_variable(var),
743 /* Once we've created this temporary, mark it read only so it's no
744 * longer considered an lvalue.
746 var->read_only = true;
748 return new(ctx) ir_dereference_variable(var);
753 ast_node::hir(exec_list *instructions,
754 struct _mesa_glsl_parse_state *state)
763 mark_whole_array_access(ir_rvalue *access)
765 ir_dereference_variable *deref = access->as_dereference_variable();
768 deref->var->max_array_access = deref->type->length - 1;
773 do_comparison(void *mem_ctx, int operation, ir_rvalue *op0, ir_rvalue *op1)
776 ir_rvalue *cmp = NULL;
778 if (operation == ir_binop_all_equal)
779 join_op = ir_binop_logic_and;
781 join_op = ir_binop_logic_or;
783 switch (op0->type->base_type) {
784 case GLSL_TYPE_FLOAT:
788 return new(mem_ctx) ir_expression(operation, op0, op1);
790 case GLSL_TYPE_ARRAY: {
791 for (unsigned int i = 0; i < op0->type->length; i++) {
792 ir_rvalue *e0, *e1, *result;
794 e0 = new(mem_ctx) ir_dereference_array(op0->clone(mem_ctx, NULL),
795 new(mem_ctx) ir_constant(i));
796 e1 = new(mem_ctx) ir_dereference_array(op1->clone(mem_ctx, NULL),
797 new(mem_ctx) ir_constant(i));
798 result = do_comparison(mem_ctx, operation, e0, e1);
801 cmp = new(mem_ctx) ir_expression(join_op, cmp, result);
807 mark_whole_array_access(op0);
808 mark_whole_array_access(op1);
812 case GLSL_TYPE_STRUCT: {
813 for (unsigned int i = 0; i < op0->type->length; i++) {
814 ir_rvalue *e0, *e1, *result;
815 const char *field_name = op0->type->fields.structure[i].name;
817 e0 = new(mem_ctx) ir_dereference_record(op0->clone(mem_ctx, NULL),
819 e1 = new(mem_ctx) ir_dereference_record(op1->clone(mem_ctx, NULL),
821 result = do_comparison(mem_ctx, operation, e0, e1);
824 cmp = new(mem_ctx) ir_expression(join_op, cmp, result);
832 case GLSL_TYPE_ERROR:
834 case GLSL_TYPE_SAMPLER:
835 /* I assume a comparison of a struct containing a sampler just
836 * ignores the sampler present in the type.
841 assert(!"Should not get here.");
846 cmp = new(mem_ctx) ir_constant(true);
851 /* For logical operations, we want to ensure that the operands are
852 * scalar booleans. If it isn't, emit an error and return a constant
853 * boolean to avoid triggering cascading error messages.
856 get_scalar_boolean_operand(exec_list *instructions,
857 struct _mesa_glsl_parse_state *state,
858 ast_expression *parent_expr,
860 const char *operand_name,
863 ast_expression *expr = parent_expr->subexpressions[operand];
865 ir_rvalue *val = expr->hir(instructions, state);
867 if (val->type->is_boolean() && val->type->is_scalar())
870 if (!*error_emitted) {
871 YYLTYPE loc = expr->get_location();
872 _mesa_glsl_error(&loc, state, "%s of `%s' must be scalar boolean",
874 parent_expr->operator_string(parent_expr->oper));
875 *error_emitted = true;
878 return new(ctx) ir_constant(true);
882 ast_expression::hir(exec_list *instructions,
883 struct _mesa_glsl_parse_state *state)
886 static const int operations[AST_NUM_OPERATORS] = {
887 -1, /* ast_assign doesn't convert to ir_expression. */
888 -1, /* ast_plus doesn't convert to ir_expression. */
912 /* Note: The following block of expression types actually convert
913 * to multiple IR instructions.
915 ir_binop_mul, /* ast_mul_assign */
916 ir_binop_div, /* ast_div_assign */
917 ir_binop_mod, /* ast_mod_assign */
918 ir_binop_add, /* ast_add_assign */
919 ir_binop_sub, /* ast_sub_assign */
920 ir_binop_lshift, /* ast_ls_assign */
921 ir_binop_rshift, /* ast_rs_assign */
922 ir_binop_bit_and, /* ast_and_assign */
923 ir_binop_bit_xor, /* ast_xor_assign */
924 ir_binop_bit_or, /* ast_or_assign */
926 -1, /* ast_conditional doesn't convert to ir_expression. */
927 ir_binop_add, /* ast_pre_inc. */
928 ir_binop_sub, /* ast_pre_dec. */
929 ir_binop_add, /* ast_post_inc. */
930 ir_binop_sub, /* ast_post_dec. */
931 -1, /* ast_field_selection doesn't conv to ir_expression. */
932 -1, /* ast_array_index doesn't convert to ir_expression. */
933 -1, /* ast_function_call doesn't conv to ir_expression. */
934 -1, /* ast_identifier doesn't convert to ir_expression. */
935 -1, /* ast_int_constant doesn't convert to ir_expression. */
936 -1, /* ast_uint_constant doesn't conv to ir_expression. */
937 -1, /* ast_float_constant doesn't conv to ir_expression. */
938 -1, /* ast_bool_constant doesn't conv to ir_expression. */
939 -1, /* ast_sequence doesn't convert to ir_expression. */
941 ir_rvalue *result = NULL;
943 const struct glsl_type *type = glsl_type::error_type;
944 bool error_emitted = false;
947 loc = this->get_location();
949 switch (this->oper) {
951 op[0] = this->subexpressions[0]->hir(instructions, state);
952 op[1] = this->subexpressions[1]->hir(instructions, state);
954 result = do_assignment(instructions, state, op[0], op[1], false,
955 this->subexpressions[0]->get_location());
956 error_emitted = result->type->is_error();
962 op[0] = this->subexpressions[0]->hir(instructions, state);
964 type = unary_arithmetic_result_type(op[0]->type, state, & loc);
966 error_emitted = type->is_error();
972 op[0] = this->subexpressions[0]->hir(instructions, state);
974 type = unary_arithmetic_result_type(op[0]->type, state, & loc);
976 error_emitted = type->is_error();
978 result = new(ctx) ir_expression(operations[this->oper], type,
986 op[0] = this->subexpressions[0]->hir(instructions, state);
987 op[1] = this->subexpressions[1]->hir(instructions, state);
989 type = arithmetic_result_type(op[0], op[1],
990 (this->oper == ast_mul),
992 error_emitted = type->is_error();
994 result = new(ctx) ir_expression(operations[this->oper], type,
999 op[0] = this->subexpressions[0]->hir(instructions, state);
1000 op[1] = this->subexpressions[1]->hir(instructions, state);
1002 type = modulus_result_type(op[0]->type, op[1]->type, state, & loc);
1004 assert(operations[this->oper] == ir_binop_mod);
1006 result = new(ctx) ir_expression(operations[this->oper], type,
1008 error_emitted = type->is_error();
1013 if (state->language_version < 130) {
1014 _mesa_glsl_error(&loc, state, "operator %s requires GLSL 1.30",
1015 operator_string(this->oper));
1016 error_emitted = true;
1019 op[0] = this->subexpressions[0]->hir(instructions, state);
1020 op[1] = this->subexpressions[1]->hir(instructions, state);
1021 type = shift_result_type(op[0]->type, op[1]->type, this->oper, state,
1023 result = new(ctx) ir_expression(operations[this->oper], type,
1025 error_emitted = op[0]->type->is_error() || op[1]->type->is_error();
1032 op[0] = this->subexpressions[0]->hir(instructions, state);
1033 op[1] = this->subexpressions[1]->hir(instructions, state);
1035 type = relational_result_type(op[0], op[1], state, & loc);
1037 /* The relational operators must either generate an error or result
1038 * in a scalar boolean. See page 57 of the GLSL 1.50 spec.
1040 assert(type->is_error()
1041 || ((type->base_type == GLSL_TYPE_BOOL)
1042 && type->is_scalar()));
1044 result = new(ctx) ir_expression(operations[this->oper], type,
1046 error_emitted = type->is_error();
1051 op[0] = this->subexpressions[0]->hir(instructions, state);
1052 op[1] = this->subexpressions[1]->hir(instructions, state);
1054 /* From page 58 (page 64 of the PDF) of the GLSL 1.50 spec:
1056 * "The equality operators equal (==), and not equal (!=)
1057 * operate on all types. They result in a scalar Boolean. If
1058 * the operand types do not match, then there must be a
1059 * conversion from Section 4.1.10 "Implicit Conversions"
1060 * applied to one operand that can make them match, in which
1061 * case this conversion is done."
1063 if ((!apply_implicit_conversion(op[0]->type, op[1], state)
1064 && !apply_implicit_conversion(op[1]->type, op[0], state))
1065 || (op[0]->type != op[1]->type)) {
1066 _mesa_glsl_error(& loc, state, "operands of `%s' must have the same "
1067 "type", (this->oper == ast_equal) ? "==" : "!=");
1068 error_emitted = true;
1069 } else if ((state->language_version <= 110)
1070 && (op[0]->type->is_array() || op[1]->type->is_array())) {
1071 _mesa_glsl_error(& loc, state, "array comparisons forbidden in "
1073 error_emitted = true;
1076 if (error_emitted) {
1077 result = new(ctx) ir_constant(false);
1079 result = do_comparison(ctx, operations[this->oper], op[0], op[1]);
1080 assert(result->type == glsl_type::bool_type);
1081 type = glsl_type::bool_type;
1089 op[0] = this->subexpressions[0]->hir(instructions, state);
1090 op[1] = this->subexpressions[1]->hir(instructions, state);
1091 type = bit_logic_result_type(op[0]->type, op[1]->type, this->oper,
1093 result = new(ctx) ir_expression(operations[this->oper], type,
1095 error_emitted = op[0]->type->is_error() || op[1]->type->is_error();
1099 op[0] = this->subexpressions[0]->hir(instructions, state);
1101 if (state->language_version < 130) {
1102 _mesa_glsl_error(&loc, state, "bit-wise operations require GLSL 1.30");
1103 error_emitted = true;
1106 if (!op[0]->type->is_integer()) {
1107 _mesa_glsl_error(&loc, state, "operand of `~' must be an integer");
1108 error_emitted = true;
1112 result = new(ctx) ir_expression(ir_unop_bit_not, type, op[0], NULL);
1115 case ast_logic_and: {
1116 exec_list rhs_instructions;
1117 op[0] = get_scalar_boolean_operand(instructions, state, this, 0,
1118 "LHS", &error_emitted);
1119 op[1] = get_scalar_boolean_operand(&rhs_instructions, state, this, 1,
1120 "RHS", &error_emitted);
1122 ir_constant *op0_const = op[0]->constant_expression_value();
1124 if (op0_const->value.b[0]) {
1125 instructions->append_list(&rhs_instructions);
1130 type = glsl_type::bool_type;
1132 ir_variable *const tmp = new(ctx) ir_variable(glsl_type::bool_type,
1135 instructions->push_tail(tmp);
1137 ir_if *const stmt = new(ctx) ir_if(op[0]);
1138 instructions->push_tail(stmt);
1140 stmt->then_instructions.append_list(&rhs_instructions);
1141 ir_dereference *const then_deref = new(ctx) ir_dereference_variable(tmp);
1142 ir_assignment *const then_assign =
1143 new(ctx) ir_assignment(then_deref, op[1], NULL);
1144 stmt->then_instructions.push_tail(then_assign);
1146 ir_dereference *const else_deref = new(ctx) ir_dereference_variable(tmp);
1147 ir_assignment *const else_assign =
1148 new(ctx) ir_assignment(else_deref, new(ctx) ir_constant(false), NULL);
1149 stmt->else_instructions.push_tail(else_assign);
1151 result = new(ctx) ir_dereference_variable(tmp);
1157 case ast_logic_or: {
1158 exec_list rhs_instructions;
1159 op[0] = get_scalar_boolean_operand(instructions, state, this, 0,
1160 "LHS", &error_emitted);
1161 op[1] = get_scalar_boolean_operand(&rhs_instructions, state, this, 1,
1162 "RHS", &error_emitted);
1164 ir_constant *op0_const = op[0]->constant_expression_value();
1166 if (op0_const->value.b[0]) {
1171 type = glsl_type::bool_type;
1173 ir_variable *const tmp = new(ctx) ir_variable(glsl_type::bool_type,
1176 instructions->push_tail(tmp);
1178 ir_if *const stmt = new(ctx) ir_if(op[0]);
1179 instructions->push_tail(stmt);
1181 ir_dereference *const then_deref = new(ctx) ir_dereference_variable(tmp);
1182 ir_assignment *const then_assign =
1183 new(ctx) ir_assignment(then_deref, new(ctx) ir_constant(true), NULL);
1184 stmt->then_instructions.push_tail(then_assign);
1186 stmt->else_instructions.append_list(&rhs_instructions);
1187 ir_dereference *const else_deref = new(ctx) ir_dereference_variable(tmp);
1188 ir_assignment *const else_assign =
1189 new(ctx) ir_assignment(else_deref, op[1], NULL);
1190 stmt->else_instructions.push_tail(else_assign);
1192 result = new(ctx) ir_dereference_variable(tmp);
1199 op[0] = this->subexpressions[0]->hir(instructions, state);
1200 op[1] = this->subexpressions[1]->hir(instructions, state);
1203 result = new(ctx) ir_expression(operations[this->oper], glsl_type::bool_type,
1205 type = glsl_type::bool_type;
1209 op[0] = get_scalar_boolean_operand(instructions, state, this, 0,
1210 "operand", &error_emitted);
1212 result = new(ctx) ir_expression(operations[this->oper], glsl_type::bool_type,
1214 type = glsl_type::bool_type;
1217 case ast_mul_assign:
1218 case ast_div_assign:
1219 case ast_add_assign:
1220 case ast_sub_assign: {
1221 op[0] = this->subexpressions[0]->hir(instructions, state);
1222 op[1] = this->subexpressions[1]->hir(instructions, state);
1224 type = arithmetic_result_type(op[0], op[1],
1225 (this->oper == ast_mul_assign),
1228 ir_rvalue *temp_rhs = new(ctx) ir_expression(operations[this->oper], type,
1231 result = do_assignment(instructions, state,
1232 op[0]->clone(ctx, NULL), temp_rhs, false,
1233 this->subexpressions[0]->get_location());
1234 type = result->type;
1235 error_emitted = (op[0]->type->is_error());
1237 /* GLSL 1.10 does not allow array assignment. However, we don't have to
1238 * explicitly test for this because none of the binary expression
1239 * operators allow array operands either.
1245 case ast_mod_assign: {
1246 op[0] = this->subexpressions[0]->hir(instructions, state);
1247 op[1] = this->subexpressions[1]->hir(instructions, state);
1249 type = modulus_result_type(op[0]->type, op[1]->type, state, & loc);
1251 assert(operations[this->oper] == ir_binop_mod);
1253 ir_rvalue *temp_rhs;
1254 temp_rhs = new(ctx) ir_expression(operations[this->oper], type,
1257 result = do_assignment(instructions, state,
1258 op[0]->clone(ctx, NULL), temp_rhs, false,
1259 this->subexpressions[0]->get_location());
1260 type = result->type;
1261 error_emitted = type->is_error();
1266 case ast_rs_assign: {
1267 op[0] = this->subexpressions[0]->hir(instructions, state);
1268 op[1] = this->subexpressions[1]->hir(instructions, state);
1269 type = shift_result_type(op[0]->type, op[1]->type, this->oper, state,
1271 ir_rvalue *temp_rhs = new(ctx) ir_expression(operations[this->oper],
1272 type, op[0], op[1]);
1273 result = do_assignment(instructions, state, op[0]->clone(ctx, NULL),
1275 this->subexpressions[0]->get_location());
1276 error_emitted = op[0]->type->is_error() || op[1]->type->is_error();
1280 case ast_and_assign:
1281 case ast_xor_assign:
1282 case ast_or_assign: {
1283 op[0] = this->subexpressions[0]->hir(instructions, state);
1284 op[1] = this->subexpressions[1]->hir(instructions, state);
1285 type = bit_logic_result_type(op[0]->type, op[1]->type, this->oper,
1287 ir_rvalue *temp_rhs = new(ctx) ir_expression(operations[this->oper],
1288 type, op[0], op[1]);
1289 result = do_assignment(instructions, state, op[0]->clone(ctx, NULL),
1291 this->subexpressions[0]->get_location());
1292 error_emitted = op[0]->type->is_error() || op[1]->type->is_error();
1296 case ast_conditional: {
1297 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1299 * "The ternary selection operator (?:). It operates on three
1300 * expressions (exp1 ? exp2 : exp3). This operator evaluates the
1301 * first expression, which must result in a scalar Boolean."
1303 op[0] = get_scalar_boolean_operand(instructions, state, this, 0,
1304 "condition", &error_emitted);
1306 /* The :? operator is implemented by generating an anonymous temporary
1307 * followed by an if-statement. The last instruction in each branch of
1308 * the if-statement assigns a value to the anonymous temporary. This
1309 * temporary is the r-value of the expression.
1311 exec_list then_instructions;
1312 exec_list else_instructions;
1314 op[1] = this->subexpressions[1]->hir(&then_instructions, state);
1315 op[2] = this->subexpressions[2]->hir(&else_instructions, state);
1317 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1319 * "The second and third expressions can be any type, as
1320 * long their types match, or there is a conversion in
1321 * Section 4.1.10 "Implicit Conversions" that can be applied
1322 * to one of the expressions to make their types match. This
1323 * resulting matching type is the type of the entire
1326 if ((!apply_implicit_conversion(op[1]->type, op[2], state)
1327 && !apply_implicit_conversion(op[2]->type, op[1], state))
1328 || (op[1]->type != op[2]->type)) {
1329 YYLTYPE loc = this->subexpressions[1]->get_location();
1331 _mesa_glsl_error(& loc, state, "Second and third operands of ?: "
1332 "operator must have matching types.");
1333 error_emitted = true;
1334 type = glsl_type::error_type;
1339 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1341 * "The second and third expressions must be the same type, but can
1342 * be of any type other than an array."
1344 if ((state->language_version <= 110) && type->is_array()) {
1345 _mesa_glsl_error(& loc, state, "Second and third operands of ?: "
1346 "operator must not be arrays.");
1347 error_emitted = true;
1350 ir_constant *cond_val = op[0]->constant_expression_value();
1351 ir_constant *then_val = op[1]->constant_expression_value();
1352 ir_constant *else_val = op[2]->constant_expression_value();
1354 if (then_instructions.is_empty()
1355 && else_instructions.is_empty()
1356 && (cond_val != NULL) && (then_val != NULL) && (else_val != NULL)) {
1357 result = (cond_val->value.b[0]) ? then_val : else_val;
1359 ir_variable *const tmp =
1360 new(ctx) ir_variable(type, "conditional_tmp", ir_var_temporary);
1361 instructions->push_tail(tmp);
1363 ir_if *const stmt = new(ctx) ir_if(op[0]);
1364 instructions->push_tail(stmt);
1366 then_instructions.move_nodes_to(& stmt->then_instructions);
1367 ir_dereference *const then_deref =
1368 new(ctx) ir_dereference_variable(tmp);
1369 ir_assignment *const then_assign =
1370 new(ctx) ir_assignment(then_deref, op[1], NULL);
1371 stmt->then_instructions.push_tail(then_assign);
1373 else_instructions.move_nodes_to(& stmt->else_instructions);
1374 ir_dereference *const else_deref =
1375 new(ctx) ir_dereference_variable(tmp);
1376 ir_assignment *const else_assign =
1377 new(ctx) ir_assignment(else_deref, op[2], NULL);
1378 stmt->else_instructions.push_tail(else_assign);
1380 result = new(ctx) ir_dereference_variable(tmp);
1387 op[0] = this->subexpressions[0]->hir(instructions, state);
1388 if (op[0]->type->base_type == GLSL_TYPE_FLOAT)
1389 op[1] = new(ctx) ir_constant(1.0f);
1391 op[1] = new(ctx) ir_constant(1);
1393 type = arithmetic_result_type(op[0], op[1], false, state, & loc);
1395 ir_rvalue *temp_rhs;
1396 temp_rhs = new(ctx) ir_expression(operations[this->oper], type,
1399 result = do_assignment(instructions, state,
1400 op[0]->clone(ctx, NULL), temp_rhs, false,
1401 this->subexpressions[0]->get_location());
1402 type = result->type;
1403 error_emitted = op[0]->type->is_error();
1408 case ast_post_dec: {
1409 op[0] = this->subexpressions[0]->hir(instructions, state);
1410 if (op[0]->type->base_type == GLSL_TYPE_FLOAT)
1411 op[1] = new(ctx) ir_constant(1.0f);
1413 op[1] = new(ctx) ir_constant(1);
1415 error_emitted = op[0]->type->is_error() || op[1]->type->is_error();
1417 type = arithmetic_result_type(op[0], op[1], false, state, & loc);
1419 ir_rvalue *temp_rhs;
1420 temp_rhs = new(ctx) ir_expression(operations[this->oper], type,
1423 /* Get a temporary of a copy of the lvalue before it's modified.
1424 * This may get thrown away later.
1426 result = get_lvalue_copy(instructions, op[0]->clone(ctx, NULL));
1428 (void)do_assignment(instructions, state,
1429 op[0]->clone(ctx, NULL), temp_rhs, false,
1430 this->subexpressions[0]->get_location());
1432 type = result->type;
1433 error_emitted = op[0]->type->is_error();
1437 case ast_field_selection:
1438 result = _mesa_ast_field_selection_to_hir(this, instructions, state);
1439 type = result->type;
1442 case ast_array_index: {
1443 YYLTYPE index_loc = subexpressions[1]->get_location();
1445 op[0] = subexpressions[0]->hir(instructions, state);
1446 op[1] = subexpressions[1]->hir(instructions, state);
1448 error_emitted = op[0]->type->is_error() || op[1]->type->is_error();
1450 ir_rvalue *const array = op[0];
1452 result = new(ctx) ir_dereference_array(op[0], op[1]);
1454 /* Do not use op[0] after this point. Use array.
1462 if (!array->type->is_array()
1463 && !array->type->is_matrix()
1464 && !array->type->is_vector()) {
1465 _mesa_glsl_error(& index_loc, state,
1466 "cannot dereference non-array / non-matrix / "
1468 error_emitted = true;
1471 if (!op[1]->type->is_integer()) {
1472 _mesa_glsl_error(& index_loc, state,
1473 "array index must be integer type");
1474 error_emitted = true;
1475 } else if (!op[1]->type->is_scalar()) {
1476 _mesa_glsl_error(& index_loc, state,
1477 "array index must be scalar");
1478 error_emitted = true;
1481 /* If the array index is a constant expression and the array has a
1482 * declared size, ensure that the access is in-bounds. If the array
1483 * index is not a constant expression, ensure that the array has a
1486 ir_constant *const const_index = op[1]->constant_expression_value();
1487 if (const_index != NULL) {
1488 const int idx = const_index->value.i[0];
1489 const char *type_name;
1492 if (array->type->is_matrix()) {
1493 type_name = "matrix";
1494 } else if (array->type->is_vector()) {
1495 type_name = "vector";
1497 type_name = "array";
1500 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec:
1502 * "It is illegal to declare an array with a size, and then
1503 * later (in the same shader) index the same array with an
1504 * integral constant expression greater than or equal to the
1505 * declared size. It is also illegal to index an array with a
1506 * negative constant expression."
1508 if (array->type->is_matrix()) {
1509 if (array->type->row_type()->vector_elements <= idx) {
1510 bound = array->type->row_type()->vector_elements;
1512 } else if (array->type->is_vector()) {
1513 if (array->type->vector_elements <= idx) {
1514 bound = array->type->vector_elements;
1517 if ((array->type->array_size() > 0)
1518 && (array->type->array_size() <= idx)) {
1519 bound = array->type->array_size();
1524 _mesa_glsl_error(& loc, state, "%s index must be < %u",
1526 error_emitted = true;
1527 } else if (idx < 0) {
1528 _mesa_glsl_error(& loc, state, "%s index must be >= 0",
1530 error_emitted = true;
1533 if (array->type->is_array()) {
1534 /* If the array is a variable dereference, it dereferences the
1535 * whole array, by definition. Use this to get the variable.
1537 * FINISHME: Should some methods for getting / setting / testing
1538 * FINISHME: array access limits be added to ir_dereference?
1540 ir_variable *const v = array->whole_variable_referenced();
1541 if ((v != NULL) && (unsigned(idx) > v->max_array_access))
1542 v->max_array_access = idx;
1544 } else if (array->type->array_size() == 0) {
1545 _mesa_glsl_error(&loc, state, "unsized array index must be constant");
1547 if (array->type->is_array()) {
1548 /* whole_variable_referenced can return NULL if the array is a
1549 * member of a structure. In this case it is safe to not update
1550 * the max_array_access field because it is never used for fields
1553 ir_variable *v = array->whole_variable_referenced();
1555 v->max_array_access = array->type->array_size() - 1;
1559 /* From page 23 (29 of the PDF) of the GLSL 1.30 spec:
1561 * "Samplers aggregated into arrays within a shader (using square
1562 * brackets [ ]) can only be indexed with integral constant
1563 * expressions [...]."
1565 * This restriction was added in GLSL 1.30. Shaders using earlier version
1566 * of the language should not be rejected by the compiler front-end for
1567 * using this construct. This allows useful things such as using a loop
1568 * counter as the index to an array of samplers. If the loop in unrolled,
1569 * the code should compile correctly. Instead, emit a warning.
1571 if (array->type->is_array() &&
1572 array->type->element_type()->is_sampler() &&
1573 const_index == NULL) {
1575 if (state->language_version == 100) {
1576 _mesa_glsl_warning(&loc, state,
1577 "sampler arrays indexed with non-constant "
1578 "expressions is optional in GLSL ES 1.00");
1579 } else if (state->language_version < 130) {
1580 _mesa_glsl_warning(&loc, state,
1581 "sampler arrays indexed with non-constant "
1582 "expressions is forbidden in GLSL 1.30 and "
1585 _mesa_glsl_error(&loc, state,
1586 "sampler arrays indexed with non-constant "
1587 "expressions is forbidden in GLSL 1.30 and "
1589 error_emitted = true;
1594 result->type = glsl_type::error_type;
1596 type = result->type;
1600 case ast_function_call:
1601 /* Should *NEVER* get here. ast_function_call should always be handled
1602 * by ast_function_expression::hir.
1607 case ast_identifier: {
1608 /* ast_identifier can appear several places in a full abstract syntax
1609 * tree. This particular use must be at location specified in the grammar
1610 * as 'variable_identifier'.
1613 state->symbols->get_variable(this->primary_expression.identifier);
1615 result = new(ctx) ir_dereference_variable(var);
1619 type = result->type;
1621 _mesa_glsl_error(& loc, state, "`%s' undeclared",
1622 this->primary_expression.identifier);
1624 error_emitted = true;
1629 case ast_int_constant:
1630 type = glsl_type::int_type;
1631 result = new(ctx) ir_constant(this->primary_expression.int_constant);
1634 case ast_uint_constant:
1635 type = glsl_type::uint_type;
1636 result = new(ctx) ir_constant(this->primary_expression.uint_constant);
1639 case ast_float_constant:
1640 type = glsl_type::float_type;
1641 result = new(ctx) ir_constant(this->primary_expression.float_constant);
1644 case ast_bool_constant:
1645 type = glsl_type::bool_type;
1646 result = new(ctx) ir_constant(bool(this->primary_expression.bool_constant));
1649 case ast_sequence: {
1650 /* It should not be possible to generate a sequence in the AST without
1651 * any expressions in it.
1653 assert(!this->expressions.is_empty());
1655 /* The r-value of a sequence is the last expression in the sequence. If
1656 * the other expressions in the sequence do not have side-effects (and
1657 * therefore add instructions to the instruction list), they get dropped
1660 foreach_list_typed (ast_node, ast, link, &this->expressions)
1661 result = ast->hir(instructions, state);
1663 type = result->type;
1665 /* Any errors should have already been emitted in the loop above.
1667 error_emitted = true;
1672 if (type->is_error() && !error_emitted)
1673 _mesa_glsl_error(& loc, state, "type mismatch");
1680 ast_expression_statement::hir(exec_list *instructions,
1681 struct _mesa_glsl_parse_state *state)
1683 /* It is possible to have expression statements that don't have an
1684 * expression. This is the solitary semicolon:
1686 * for (i = 0; i < 5; i++)
1689 * In this case the expression will be NULL. Test for NULL and don't do
1690 * anything in that case.
1692 if (expression != NULL)
1693 expression->hir(instructions, state);
1695 /* Statements do not have r-values.
1702 ast_compound_statement::hir(exec_list *instructions,
1703 struct _mesa_glsl_parse_state *state)
1706 state->symbols->push_scope();
1708 foreach_list_typed (ast_node, ast, link, &this->statements)
1709 ast->hir(instructions, state);
1712 state->symbols->pop_scope();
1714 /* Compound statements do not have r-values.
1720 static const glsl_type *
1721 process_array_type(YYLTYPE *loc, const glsl_type *base, ast_node *array_size,
1722 struct _mesa_glsl_parse_state *state)
1724 unsigned length = 0;
1726 /* FINISHME: Reject delcarations of multidimensional arrays. */
1728 if (array_size != NULL) {
1729 exec_list dummy_instructions;
1730 ir_rvalue *const ir = array_size->hir(& dummy_instructions, state);
1731 YYLTYPE loc = array_size->get_location();
1733 /* FINISHME: Verify that the grammar forbids side-effects in array
1734 * FINISHME: sizes. i.e., 'vec4 [x = 12] data'
1736 assert(dummy_instructions.is_empty());
1739 if (!ir->type->is_integer()) {
1740 _mesa_glsl_error(& loc, state, "array size must be integer type");
1741 } else if (!ir->type->is_scalar()) {
1742 _mesa_glsl_error(& loc, state, "array size must be scalar type");
1744 ir_constant *const size = ir->constant_expression_value();
1747 _mesa_glsl_error(& loc, state, "array size must be a "
1748 "constant valued expression");
1749 } else if (size->value.i[0] <= 0) {
1750 _mesa_glsl_error(& loc, state, "array size must be > 0");
1752 assert(size->type == ir->type);
1753 length = size->value.u[0];
1757 } else if (state->es_shader) {
1758 /* Section 10.17 of the GLSL ES 1.00 specification states that unsized
1759 * array declarations have been removed from the language.
1761 _mesa_glsl_error(loc, state, "unsized array declarations are not "
1762 "allowed in GLSL ES 1.00.");
1765 return glsl_type::get_array_instance(base, length);
1770 ast_type_specifier::glsl_type(const char **name,
1771 struct _mesa_glsl_parse_state *state) const
1773 const struct glsl_type *type;
1775 type = state->symbols->get_type(this->type_name);
1776 *name = this->type_name;
1778 if (this->is_array) {
1779 YYLTYPE loc = this->get_location();
1780 type = process_array_type(&loc, type, this->array_size, state);
1788 apply_type_qualifier_to_variable(const struct ast_type_qualifier *qual,
1790 struct _mesa_glsl_parse_state *state,
1793 if (qual->flags.q.invariant) {
1795 _mesa_glsl_error(loc, state,
1796 "variable `%s' may not be redeclared "
1797 "`invariant' after being used",
1804 if (qual->flags.q.constant || qual->flags.q.attribute
1805 || qual->flags.q.uniform
1806 || (qual->flags.q.varying && (state->target == fragment_shader)))
1809 if (qual->flags.q.centroid)
1812 if (qual->flags.q.attribute && state->target != vertex_shader) {
1813 var->type = glsl_type::error_type;
1814 _mesa_glsl_error(loc, state,
1815 "`attribute' variables may not be declared in the "
1817 _mesa_glsl_shader_target_name(state->target));
1820 /* From page 25 (page 31 of the PDF) of the GLSL 1.10 spec:
1822 * "The varying qualifier can be used only with the data types
1823 * float, vec2, vec3, vec4, mat2, mat3, and mat4, or arrays of
1826 if (qual->flags.q.varying) {
1827 const glsl_type *non_array_type;
1829 if (var->type && var->type->is_array())
1830 non_array_type = var->type->fields.array;
1832 non_array_type = var->type;
1834 if (non_array_type && non_array_type->base_type != GLSL_TYPE_FLOAT) {
1835 var->type = glsl_type::error_type;
1836 _mesa_glsl_error(loc, state,
1837 "varying variables must be of base type float");
1841 /* If there is no qualifier that changes the mode of the variable, leave
1842 * the setting alone.
1844 if (qual->flags.q.in && qual->flags.q.out)
1845 var->mode = ir_var_inout;
1846 else if (qual->flags.q.attribute || qual->flags.q.in
1847 || (qual->flags.q.varying && (state->target == fragment_shader)))
1848 var->mode = ir_var_in;
1849 else if (qual->flags.q.out
1850 || (qual->flags.q.varying && (state->target == vertex_shader)))
1851 var->mode = ir_var_out;
1852 else if (qual->flags.q.uniform)
1853 var->mode = ir_var_uniform;
1855 if (state->all_invariant && (state->current_function == NULL)) {
1856 switch (state->target) {
1858 if (var->mode == ir_var_out)
1859 var->invariant = true;
1861 case geometry_shader:
1862 if ((var->mode == ir_var_in) || (var->mode == ir_var_out))
1863 var->invariant = true;
1865 case fragment_shader:
1866 if (var->mode == ir_var_in)
1867 var->invariant = true;
1872 if (qual->flags.q.flat)
1873 var->interpolation = ir_var_flat;
1874 else if (qual->flags.q.noperspective)
1875 var->interpolation = ir_var_noperspective;
1877 var->interpolation = ir_var_smooth;
1879 var->pixel_center_integer = qual->flags.q.pixel_center_integer;
1880 var->origin_upper_left = qual->flags.q.origin_upper_left;
1881 if ((qual->flags.q.origin_upper_left || qual->flags.q.pixel_center_integer)
1882 && (strcmp(var->name, "gl_FragCoord") != 0)) {
1883 const char *const qual_string = (qual->flags.q.origin_upper_left)
1884 ? "origin_upper_left" : "pixel_center_integer";
1886 _mesa_glsl_error(loc, state,
1887 "layout qualifier `%s' can only be applied to "
1888 "fragment shader input `gl_FragCoord'",
1892 if (qual->flags.q.explicit_location) {
1893 const bool global_scope = (state->current_function == NULL);
1895 const char *string = "";
1897 /* In the vertex shader only shader inputs can be given explicit
1900 * In the fragment shader only shader outputs can be given explicit
1903 switch (state->target) {
1905 if (!global_scope || (var->mode != ir_var_in)) {
1911 case geometry_shader:
1912 _mesa_glsl_error(loc, state,
1913 "geometry shader variables cannot be given "
1914 "explicit locations\n");
1917 case fragment_shader:
1918 if (!global_scope || (var->mode != ir_var_in)) {
1926 _mesa_glsl_error(loc, state,
1927 "only %s shader %s variables can be given an "
1928 "explicit location\n",
1929 _mesa_glsl_shader_target_name(state->target),
1932 var->explicit_location = true;
1934 /* This bit of silliness is needed because invalid explicit locations
1935 * are supposed to be flagged during linking. Small negative values
1936 * biased by VERT_ATTRIB_GENERIC0 or FRAG_RESULT_DATA0 could alias
1937 * built-in values (e.g., -16+VERT_ATTRIB_GENERIC0 = VERT_ATTRIB_POS).
1938 * The linker needs to be able to differentiate these cases. This
1939 * ensures that negative values stay negative.
1941 if (qual->location >= 0) {
1942 var->location = (state->target == vertex_shader)
1943 ? (qual->location + VERT_ATTRIB_GENERIC0)
1944 : (qual->location + FRAG_RESULT_DATA0);
1946 var->location = qual->location;
1951 /* Does the declaration use the 'layout' keyword?
1953 const bool uses_layout = qual->flags.q.pixel_center_integer
1954 || qual->flags.q.origin_upper_left
1955 || qual->flags.q.explicit_location;
1957 /* Does the declaration use the deprecated 'attribute' or 'varying'
1960 const bool uses_deprecated_qualifier = qual->flags.q.attribute
1961 || qual->flags.q.varying;
1963 /* Is the 'layout' keyword used with parameters that allow relaxed checking.
1964 * Many implementations of GL_ARB_fragment_coord_conventions_enable and some
1965 * implementations (only Mesa?) GL_ARB_explicit_attrib_location_enable
1966 * allowed the layout qualifier to be used with 'varying' and 'attribute'.
1967 * These extensions and all following extensions that add the 'layout'
1968 * keyword have been modified to require the use of 'in' or 'out'.
1970 * The following extension do not allow the deprecated keywords:
1972 * GL_AMD_conservative_depth
1973 * GL_ARB_gpu_shader5
1974 * GL_ARB_separate_shader_objects
1975 * GL_ARB_tesselation_shader
1976 * GL_ARB_transform_feedback3
1977 * GL_ARB_uniform_buffer_object
1979 * It is unknown whether GL_EXT_shader_image_load_store or GL_NV_gpu_shader5
1980 * allow layout with the deprecated keywords.
1982 const bool relaxed_layout_qualifier_checking =
1983 state->ARB_fragment_coord_conventions_enable;
1985 if (uses_layout && uses_deprecated_qualifier) {
1986 if (relaxed_layout_qualifier_checking) {
1987 _mesa_glsl_warning(loc, state,
1988 "`layout' qualifier may not be used with "
1989 "`attribute' or `varying'");
1991 _mesa_glsl_error(loc, state,
1992 "`layout' qualifier may not be used with "
1993 "`attribute' or `varying'");
1997 /* Layout qualifiers for gl_FragDepth, which are enabled by extension
1998 * AMD_conservative_depth.
2000 int depth_layout_count = qual->flags.q.depth_any
2001 + qual->flags.q.depth_greater
2002 + qual->flags.q.depth_less
2003 + qual->flags.q.depth_unchanged;
2004 if (depth_layout_count > 0
2005 && !state->AMD_conservative_depth_enable) {
2006 _mesa_glsl_error(loc, state,
2007 "extension GL_AMD_conservative_depth must be enabled "
2008 "to use depth layout qualifiers");
2009 } else if (depth_layout_count > 0
2010 && strcmp(var->name, "gl_FragDepth") != 0) {
2011 _mesa_glsl_error(loc, state,
2012 "depth layout qualifiers can be applied only to "
2014 } else if (depth_layout_count > 1
2015 && strcmp(var->name, "gl_FragDepth") == 0) {
2016 _mesa_glsl_error(loc, state,
2017 "at most one depth layout qualifier can be applied to "
2020 if (qual->flags.q.depth_any)
2021 var->depth_layout = ir_depth_layout_any;
2022 else if (qual->flags.q.depth_greater)
2023 var->depth_layout = ir_depth_layout_greater;
2024 else if (qual->flags.q.depth_less)
2025 var->depth_layout = ir_depth_layout_less;
2026 else if (qual->flags.q.depth_unchanged)
2027 var->depth_layout = ir_depth_layout_unchanged;
2029 var->depth_layout = ir_depth_layout_none;
2031 if (var->type->is_array() && state->language_version != 110) {
2032 var->array_lvalue = true;
2037 * Get the variable that is being redeclared by this declaration
2039 * Semantic checks to verify the validity of the redeclaration are also
2040 * performed. If semantic checks fail, compilation error will be emitted via
2041 * \c _mesa_glsl_error, but a non-\c NULL pointer will still be returned.
2044 * A pointer to an existing variable in the current scope if the declaration
2045 * is a redeclaration, \c NULL otherwise.
2048 get_variable_being_redeclared(ir_variable *var, ast_declaration *decl,
2049 struct _mesa_glsl_parse_state *state)
2051 /* Check if this declaration is actually a re-declaration, either to
2052 * resize an array or add qualifiers to an existing variable.
2054 * This is allowed for variables in the current scope, or when at
2055 * global scope (for built-ins in the implicit outer scope).
2057 ir_variable *earlier = state->symbols->get_variable(decl->identifier);
2058 if (earlier == NULL ||
2059 (state->current_function != NULL &&
2060 !state->symbols->name_declared_this_scope(decl->identifier))) {
2065 YYLTYPE loc = decl->get_location();
2067 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec,
2069 * "It is legal to declare an array without a size and then
2070 * later re-declare the same name as an array of the same
2071 * type and specify a size."
2073 if ((earlier->type->array_size() == 0)
2074 && var->type->is_array()
2075 && (var->type->element_type() == earlier->type->element_type())) {
2076 /* FINISHME: This doesn't match the qualifiers on the two
2077 * FINISHME: declarations. It's not 100% clear whether this is
2078 * FINISHME: required or not.
2081 /* From page 54 (page 60 of the PDF) of the GLSL 1.20 spec:
2083 * "The size [of gl_TexCoord] can be at most
2084 * gl_MaxTextureCoords."
2086 const unsigned size = unsigned(var->type->array_size());
2087 if ((strcmp("gl_TexCoord", var->name) == 0)
2088 && (size > state->Const.MaxTextureCoords)) {
2089 _mesa_glsl_error(& loc, state, "`gl_TexCoord' array size cannot "
2090 "be larger than gl_MaxTextureCoords (%u)\n",
2091 state->Const.MaxTextureCoords);
2092 } else if ((size > 0) && (size <= earlier->max_array_access)) {
2093 _mesa_glsl_error(& loc, state, "array size must be > %u due to "
2095 earlier->max_array_access);
2098 earlier->type = var->type;
2101 } else if (state->ARB_fragment_coord_conventions_enable
2102 && strcmp(var->name, "gl_FragCoord") == 0
2103 && earlier->type == var->type
2104 && earlier->mode == var->mode) {
2105 /* Allow redeclaration of gl_FragCoord for ARB_fcc layout
2108 earlier->origin_upper_left = var->origin_upper_left;
2109 earlier->pixel_center_integer = var->pixel_center_integer;
2111 /* According to section 4.3.7 of the GLSL 1.30 spec,
2112 * the following built-in varaibles can be redeclared with an
2113 * interpolation qualifier:
2116 * * gl_FrontSecondaryColor
2117 * * gl_BackSecondaryColor
2119 * * gl_SecondaryColor
2121 } else if (state->language_version >= 130
2122 && (strcmp(var->name, "gl_FrontColor") == 0
2123 || strcmp(var->name, "gl_BackColor") == 0
2124 || strcmp(var->name, "gl_FrontSecondaryColor") == 0
2125 || strcmp(var->name, "gl_BackSecondaryColor") == 0
2126 || strcmp(var->name, "gl_Color") == 0
2127 || strcmp(var->name, "gl_SecondaryColor") == 0)
2128 && earlier->type == var->type
2129 && earlier->mode == var->mode) {
2130 earlier->interpolation = var->interpolation;
2132 /* Layout qualifiers for gl_FragDepth. */
2133 } else if (state->AMD_conservative_depth_enable
2134 && strcmp(var->name, "gl_FragDepth") == 0
2135 && earlier->type == var->type
2136 && earlier->mode == var->mode) {
2138 /** From the AMD_conservative_depth spec:
2139 * Within any shader, the first redeclarations of gl_FragDepth
2140 * must appear before any use of gl_FragDepth.
2142 if (earlier->used) {
2143 _mesa_glsl_error(&loc, state,
2144 "the first redeclaration of gl_FragDepth "
2145 "must appear before any use of gl_FragDepth");
2148 /* Prevent inconsistent redeclaration of depth layout qualifier. */
2149 if (earlier->depth_layout != ir_depth_layout_none
2150 && earlier->depth_layout != var->depth_layout) {
2151 _mesa_glsl_error(&loc, state,
2152 "gl_FragDepth: depth layout is declared here "
2153 "as '%s, but it was previously declared as "
2155 depth_layout_string(var->depth_layout),
2156 depth_layout_string(earlier->depth_layout));
2159 earlier->depth_layout = var->depth_layout;
2162 _mesa_glsl_error(&loc, state, "`%s' redeclared", decl->identifier);
2169 * Generate the IR for an initializer in a variable declaration
2172 process_initializer(ir_variable *var, ast_declaration *decl,
2173 ast_fully_specified_type *type,
2174 exec_list *initializer_instructions,
2175 struct _mesa_glsl_parse_state *state)
2177 ir_rvalue *result = NULL;
2179 YYLTYPE initializer_loc = decl->initializer->get_location();
2181 /* From page 24 (page 30 of the PDF) of the GLSL 1.10 spec:
2183 * "All uniform variables are read-only and are initialized either
2184 * directly by an application via API commands, or indirectly by
2187 if ((state->language_version <= 110)
2188 && (var->mode == ir_var_uniform)) {
2189 _mesa_glsl_error(& initializer_loc, state,
2190 "cannot initialize uniforms in GLSL 1.10");
2193 if (var->type->is_sampler()) {
2194 _mesa_glsl_error(& initializer_loc, state,
2195 "cannot initialize samplers");
2198 if ((var->mode == ir_var_in) && (state->current_function == NULL)) {
2199 _mesa_glsl_error(& initializer_loc, state,
2200 "cannot initialize %s shader input / %s",
2201 _mesa_glsl_shader_target_name(state->target),
2202 (state->target == vertex_shader)
2203 ? "attribute" : "varying");
2206 ir_dereference *const lhs = new(state) ir_dereference_variable(var);
2207 ir_rvalue *rhs = decl->initializer->hir(initializer_instructions,
2210 /* Calculate the constant value if this is a const or uniform
2213 if (type->qualifier.flags.q.constant
2214 || type->qualifier.flags.q.uniform) {
2215 ir_rvalue *new_rhs = validate_assignment(state, var->type, rhs, true);
2216 if (new_rhs != NULL) {
2219 ir_constant *constant_value = rhs->constant_expression_value();
2220 if (!constant_value) {
2221 _mesa_glsl_error(& initializer_loc, state,
2222 "initializer of %s variable `%s' must be a "
2223 "constant expression",
2224 (type->qualifier.flags.q.constant)
2225 ? "const" : "uniform",
2227 if (var->type->is_numeric()) {
2228 /* Reduce cascading errors. */
2229 var->constant_value = ir_constant::zero(state, var->type);
2232 rhs = constant_value;
2233 var->constant_value = constant_value;
2236 _mesa_glsl_error(&initializer_loc, state,
2237 "initializer of type %s cannot be assigned to "
2238 "variable of type %s",
2239 rhs->type->name, var->type->name);
2240 if (var->type->is_numeric()) {
2241 /* Reduce cascading errors. */
2242 var->constant_value = ir_constant::zero(state, var->type);
2247 if (rhs && !rhs->type->is_error()) {
2248 bool temp = var->read_only;
2249 if (type->qualifier.flags.q.constant)
2250 var->read_only = false;
2252 /* Never emit code to initialize a uniform.
2254 const glsl_type *initializer_type;
2255 if (!type->qualifier.flags.q.uniform) {
2256 result = do_assignment(initializer_instructions, state,
2258 type->get_location());
2259 initializer_type = result->type;
2261 initializer_type = rhs->type;
2263 /* If the declared variable is an unsized array, it must inherrit
2264 * its full type from the initializer. A declaration such as
2266 * uniform float a[] = float[](1.0, 2.0, 3.0, 3.0);
2270 * uniform float a[4] = float[](1.0, 2.0, 3.0, 3.0);
2272 * The assignment generated in the if-statement (below) will also
2273 * automatically handle this case for non-uniforms.
2275 * If the declared variable is not an array, the types must
2276 * already match exactly. As a result, the type assignment
2277 * here can be done unconditionally. For non-uniforms the call
2278 * to do_assignment can change the type of the initializer (via
2279 * the implicit conversion rules). For uniforms the initializer
2280 * must be a constant expression, and the type of that expression
2281 * was validated above.
2283 var->type = initializer_type;
2285 var->read_only = temp;
2292 ast_declarator_list::hir(exec_list *instructions,
2293 struct _mesa_glsl_parse_state *state)
2296 const struct glsl_type *decl_type;
2297 const char *type_name = NULL;
2298 ir_rvalue *result = NULL;
2299 YYLTYPE loc = this->get_location();
2301 /* From page 46 (page 52 of the PDF) of the GLSL 1.50 spec:
2303 * "To ensure that a particular output variable is invariant, it is
2304 * necessary to use the invariant qualifier. It can either be used to
2305 * qualify a previously declared variable as being invariant
2307 * invariant gl_Position; // make existing gl_Position be invariant"
2309 * In these cases the parser will set the 'invariant' flag in the declarator
2310 * list, and the type will be NULL.
2312 if (this->invariant) {
2313 assert(this->type == NULL);
2315 if (state->current_function != NULL) {
2316 _mesa_glsl_error(& loc, state,
2317 "All uses of `invariant' keyword must be at global "
2321 foreach_list_typed (ast_declaration, decl, link, &this->declarations) {
2322 assert(!decl->is_array);
2323 assert(decl->array_size == NULL);
2324 assert(decl->initializer == NULL);
2326 ir_variable *const earlier =
2327 state->symbols->get_variable(decl->identifier);
2328 if (earlier == NULL) {
2329 _mesa_glsl_error(& loc, state,
2330 "Undeclared variable `%s' cannot be marked "
2331 "invariant\n", decl->identifier);
2332 } else if ((state->target == vertex_shader)
2333 && (earlier->mode != ir_var_out)) {
2334 _mesa_glsl_error(& loc, state,
2335 "`%s' cannot be marked invariant, vertex shader "
2336 "outputs only\n", decl->identifier);
2337 } else if ((state->target == fragment_shader)
2338 && (earlier->mode != ir_var_in)) {
2339 _mesa_glsl_error(& loc, state,
2340 "`%s' cannot be marked invariant, fragment shader "
2341 "inputs only\n", decl->identifier);
2342 } else if (earlier->used) {
2343 _mesa_glsl_error(& loc, state,
2344 "variable `%s' may not be redeclared "
2345 "`invariant' after being used",
2348 earlier->invariant = true;
2352 /* Invariant redeclarations do not have r-values.
2357 assert(this->type != NULL);
2358 assert(!this->invariant);
2360 /* The type specifier may contain a structure definition. Process that
2361 * before any of the variable declarations.
2363 (void) this->type->specifier->hir(instructions, state);
2365 decl_type = this->type->specifier->glsl_type(& type_name, state);
2366 if (this->declarations.is_empty()) {
2367 /* The only valid case where the declaration list can be empty is when
2368 * the declaration is setting the default precision of a built-in type
2369 * (e.g., 'precision highp vec4;').
2372 if (decl_type != NULL) {
2374 _mesa_glsl_error(& loc, state, "incomplete declaration");
2378 foreach_list_typed (ast_declaration, decl, link, &this->declarations) {
2379 const struct glsl_type *var_type;
2382 /* FINISHME: Emit a warning if a variable declaration shadows a
2383 * FINISHME: declaration at a higher scope.
2386 if ((decl_type == NULL) || decl_type->is_void()) {
2387 if (type_name != NULL) {
2388 _mesa_glsl_error(& loc, state,
2389 "invalid type `%s' in declaration of `%s'",
2390 type_name, decl->identifier);
2392 _mesa_glsl_error(& loc, state,
2393 "invalid type in declaration of `%s'",
2399 if (decl->is_array) {
2400 var_type = process_array_type(&loc, decl_type, decl->array_size,
2403 var_type = decl_type;
2406 var = new(ctx) ir_variable(var_type, decl->identifier, ir_var_auto);
2408 /* From page 22 (page 28 of the PDF) of the GLSL 1.10 specification;
2410 * "Global variables can only use the qualifiers const,
2411 * attribute, uni form, or varying. Only one may be
2414 * Local variables can only use the qualifier const."
2416 * This is relaxed in GLSL 1.30. It is also relaxed by any extension
2417 * that adds the 'layout' keyword.
2419 if ((state->language_version < 130)
2420 && !state->ARB_explicit_attrib_location_enable
2421 && !state->ARB_fragment_coord_conventions_enable) {
2422 if (this->type->qualifier.flags.q.out) {
2423 _mesa_glsl_error(& loc, state,
2424 "`out' qualifier in declaration of `%s' "
2425 "only valid for function parameters in %s.",
2426 decl->identifier, state->version_string);
2428 if (this->type->qualifier.flags.q.in) {
2429 _mesa_glsl_error(& loc, state,
2430 "`in' qualifier in declaration of `%s' "
2431 "only valid for function parameters in %s.",
2432 decl->identifier, state->version_string);
2434 /* FINISHME: Test for other invalid qualifiers. */
2437 apply_type_qualifier_to_variable(& this->type->qualifier, var, state,
2440 if (this->type->qualifier.flags.q.invariant) {
2441 if ((state->target == vertex_shader) && !(var->mode == ir_var_out ||
2442 var->mode == ir_var_inout)) {
2443 /* FINISHME: Note that this doesn't work for invariant on
2444 * a function signature outval
2446 _mesa_glsl_error(& loc, state,
2447 "`%s' cannot be marked invariant, vertex shader "
2448 "outputs only\n", var->name);
2449 } else if ((state->target == fragment_shader) &&
2450 !(var->mode == ir_var_in || var->mode == ir_var_inout)) {
2451 /* FINISHME: Note that this doesn't work for invariant on
2452 * a function signature inval
2454 _mesa_glsl_error(& loc, state,
2455 "`%s' cannot be marked invariant, fragment shader "
2456 "inputs only\n", var->name);
2460 if (state->current_function != NULL) {
2461 const char *mode = NULL;
2462 const char *extra = "";
2464 /* There is no need to check for 'inout' here because the parser will
2465 * only allow that in function parameter lists.
2467 if (this->type->qualifier.flags.q.attribute) {
2469 } else if (this->type->qualifier.flags.q.uniform) {
2471 } else if (this->type->qualifier.flags.q.varying) {
2473 } else if (this->type->qualifier.flags.q.in) {
2475 extra = " or in function parameter list";
2476 } else if (this->type->qualifier.flags.q.out) {
2478 extra = " or in function parameter list";
2482 _mesa_glsl_error(& loc, state,
2483 "%s variable `%s' must be declared at "
2485 mode, var->name, extra);
2487 } else if (var->mode == ir_var_in) {
2488 var->read_only = true;
2490 if (state->target == vertex_shader) {
2491 bool error_emitted = false;
2493 /* From page 31 (page 37 of the PDF) of the GLSL 1.50 spec:
2495 * "Vertex shader inputs can only be float, floating-point
2496 * vectors, matrices, signed and unsigned integers and integer
2497 * vectors. Vertex shader inputs can also form arrays of these
2498 * types, but not structures."
2500 * From page 31 (page 27 of the PDF) of the GLSL 1.30 spec:
2502 * "Vertex shader inputs can only be float, floating-point
2503 * vectors, matrices, signed and unsigned integers and integer
2504 * vectors. They cannot be arrays or structures."
2506 * From page 23 (page 29 of the PDF) of the GLSL 1.20 spec:
2508 * "The attribute qualifier can be used only with float,
2509 * floating-point vectors, and matrices. Attribute variables
2510 * cannot be declared as arrays or structures."
2512 const glsl_type *check_type = var->type->is_array()
2513 ? var->type->fields.array : var->type;
2515 switch (check_type->base_type) {
2516 case GLSL_TYPE_FLOAT:
2518 case GLSL_TYPE_UINT:
2520 if (state->language_version > 120)
2524 _mesa_glsl_error(& loc, state,
2525 "vertex shader input / attribute cannot have "
2527 var->type->is_array() ? "array of " : "",
2529 error_emitted = true;
2532 if (!error_emitted && (state->language_version <= 130)
2533 && var->type->is_array()) {
2534 _mesa_glsl_error(& loc, state,
2535 "vertex shader input / attribute cannot have "
2537 error_emitted = true;
2542 /* Integer vertex outputs must be qualified with 'flat'.
2544 * From section 4.3.6 of the GLSL 1.30 spec:
2545 * "If a vertex output is a signed or unsigned integer or integer
2546 * vector, then it must be qualified with the interpolation qualifier
2549 if (state->language_version >= 130
2550 && state->target == vertex_shader
2551 && state->current_function == NULL
2552 && var->type->is_integer()
2553 && var->mode == ir_var_out
2554 && var->interpolation != ir_var_flat) {
2556 _mesa_glsl_error(&loc, state, "If a vertex output is an integer, "
2557 "then it must be qualified with 'flat'");
2561 /* Interpolation qualifiers cannot be applied to 'centroid' and
2562 * 'centroid varying'.
2564 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
2565 * "interpolation qualifiers may only precede the qualifiers in,
2566 * centroid in, out, or centroid out in a declaration. They do not apply
2567 * to the deprecated storage qualifiers varying or centroid varying."
2569 if (state->language_version >= 130
2570 && this->type->qualifier.has_interpolation()
2571 && this->type->qualifier.flags.q.varying) {
2573 const char *i = this->type->qualifier.interpolation_string();
2576 if (this->type->qualifier.flags.q.centroid)
2577 s = "centroid varying";
2581 _mesa_glsl_error(&loc, state,
2582 "qualifier '%s' cannot be applied to the "
2583 "deprecated storage qualifier '%s'", i, s);
2587 /* Interpolation qualifiers can only apply to vertex shader outputs and
2588 * fragment shader inputs.
2590 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
2591 * "Outputs from a vertex shader (out) and inputs to a fragment
2592 * shader (in) can be further qualified with one or more of these
2593 * interpolation qualifiers"
2595 if (state->language_version >= 130
2596 && this->type->qualifier.has_interpolation()) {
2598 const char *i = this->type->qualifier.interpolation_string();
2601 switch (state->target) {
2603 if (this->type->qualifier.flags.q.in) {
2604 _mesa_glsl_error(&loc, state,
2605 "qualifier '%s' cannot be applied to vertex "
2606 "shader inputs", i);
2609 case fragment_shader:
2610 if (this->type->qualifier.flags.q.out) {
2611 _mesa_glsl_error(&loc, state,
2612 "qualifier '%s' cannot be applied to fragment "
2613 "shader outputs", i);
2622 /* From section 4.3.4 of the GLSL 1.30 spec:
2623 * "It is an error to use centroid in in a vertex shader."
2625 if (state->language_version >= 130
2626 && this->type->qualifier.flags.q.centroid
2627 && this->type->qualifier.flags.q.in
2628 && state->target == vertex_shader) {
2630 _mesa_glsl_error(&loc, state,
2631 "'centroid in' cannot be used in a vertex shader");
2635 /* Precision qualifiers exists only in GLSL versions 1.00 and >= 1.30.
2637 if (this->type->specifier->precision != ast_precision_none
2638 && state->language_version != 100
2639 && state->language_version < 130) {
2641 _mesa_glsl_error(&loc, state,
2642 "precision qualifiers are supported only in GLSL ES "
2643 "1.00, and GLSL 1.30 and later");
2647 /* Precision qualifiers only apply to floating point and integer types.
2649 * From section 4.5.2 of the GLSL 1.30 spec:
2650 * "Any floating point or any integer declaration can have the type
2651 * preceded by one of these precision qualifiers [...] Literal
2652 * constants do not have precision qualifiers. Neither do Boolean
2655 * In GLSL ES, sampler types are also allowed.
2657 * From page 87 of the GLSL ES spec:
2658 * "RESOLUTION: Allow sampler types to take a precision qualifier."
2660 if (this->type->specifier->precision != ast_precision_none
2661 && !var->type->is_float()
2662 && !var->type->is_integer()
2663 && !(var->type->is_sampler() && state->es_shader)
2664 && !(var->type->is_array()
2665 && (var->type->fields.array->is_float()
2666 || var->type->fields.array->is_integer()))) {
2668 _mesa_glsl_error(&loc, state,
2669 "precision qualifiers apply only to floating point"
2670 "%s types", state->es_shader ? ", integer, and sampler"
2674 /* Process the initializer and add its instructions to a temporary
2675 * list. This list will be added to the instruction stream (below) after
2676 * the declaration is added. This is done because in some cases (such as
2677 * redeclarations) the declaration may not actually be added to the
2678 * instruction stream.
2680 exec_list initializer_instructions;
2681 ir_variable *earlier = get_variable_being_redeclared(var, decl, state);
2683 if (decl->initializer != NULL) {
2684 result = process_initializer((earlier == NULL) ? var : earlier,
2686 &initializer_instructions, state);
2689 /* From page 23 (page 29 of the PDF) of the GLSL 1.10 spec:
2691 * "It is an error to write to a const variable outside of
2692 * its declaration, so they must be initialized when
2695 if (this->type->qualifier.flags.q.constant && decl->initializer == NULL) {
2696 _mesa_glsl_error(& loc, state,
2697 "const declaration of `%s' must be initialized",
2701 /* If the declaration is not a redeclaration, there are a few additional
2702 * semantic checks that must be applied. In addition, variable that was
2703 * created for the declaration should be added to the IR stream.
2705 if (earlier == NULL) {
2706 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
2708 * "Identifiers starting with "gl_" are reserved for use by
2709 * OpenGL, and may not be declared in a shader as either a
2710 * variable or a function."
2712 if (strncmp(decl->identifier, "gl_", 3) == 0)
2713 _mesa_glsl_error(& loc, state,
2714 "identifier `%s' uses reserved `gl_' prefix",
2717 /* Add the variable to the symbol table. Note that the initializer's
2718 * IR was already processed earlier (though it hasn't been emitted
2719 * yet), without the variable in scope.
2721 * This differs from most C-like languages, but it follows the GLSL
2722 * specification. From page 28 (page 34 of the PDF) of the GLSL 1.50
2725 * "Within a declaration, the scope of a name starts immediately
2726 * after the initializer if present or immediately after the name
2727 * being declared if not."
2729 if (!state->symbols->add_variable(var)) {
2730 YYLTYPE loc = this->get_location();
2731 _mesa_glsl_error(&loc, state, "name `%s' already taken in the "
2732 "current scope", decl->identifier);
2736 /* Push the variable declaration to the top. It means that all the
2737 * variable declarations will appear in a funny last-to-first order,
2738 * but otherwise we run into trouble if a function is prototyped, a
2739 * global var is decled, then the function is defined with usage of
2740 * the global var. See glslparsertest's CorrectModule.frag.
2742 instructions->push_head(var);
2745 instructions->append_list(&initializer_instructions);
2749 /* Generally, variable declarations do not have r-values. However,
2750 * one is used for the declaration in
2752 * while (bool b = some_condition()) {
2756 * so we return the rvalue from the last seen declaration here.
2763 ast_parameter_declarator::hir(exec_list *instructions,
2764 struct _mesa_glsl_parse_state *state)
2767 const struct glsl_type *type;
2768 const char *name = NULL;
2769 YYLTYPE loc = this->get_location();
2771 type = this->type->specifier->glsl_type(& name, state);
2775 _mesa_glsl_error(& loc, state,
2776 "invalid type `%s' in declaration of `%s'",
2777 name, this->identifier);
2779 _mesa_glsl_error(& loc, state,
2780 "invalid type in declaration of `%s'",
2784 type = glsl_type::error_type;
2787 /* From page 62 (page 68 of the PDF) of the GLSL 1.50 spec:
2789 * "Functions that accept no input arguments need not use void in the
2790 * argument list because prototypes (or definitions) are required and
2791 * therefore there is no ambiguity when an empty argument list "( )" is
2792 * declared. The idiom "(void)" as a parameter list is provided for
2795 * Placing this check here prevents a void parameter being set up
2796 * for a function, which avoids tripping up checks for main taking
2797 * parameters and lookups of an unnamed symbol.
2799 if (type->is_void()) {
2800 if (this->identifier != NULL)
2801 _mesa_glsl_error(& loc, state,
2802 "named parameter cannot have type `void'");
2808 if (formal_parameter && (this->identifier == NULL)) {
2809 _mesa_glsl_error(& loc, state, "formal parameter lacks a name");
2813 /* This only handles "vec4 foo[..]". The earlier specifier->glsl_type(...)
2814 * call already handled the "vec4[..] foo" case.
2816 if (this->is_array) {
2817 type = process_array_type(&loc, type, this->array_size, state);
2820 if (type->array_size() == 0) {
2821 _mesa_glsl_error(&loc, state, "arrays passed as parameters must have "
2822 "a declared size.");
2823 type = glsl_type::error_type;
2827 ir_variable *var = new(ctx) ir_variable(type, this->identifier, ir_var_in);
2829 /* Apply any specified qualifiers to the parameter declaration. Note that
2830 * for function parameters the default mode is 'in'.
2832 apply_type_qualifier_to_variable(& this->type->qualifier, var, state, & loc);
2834 instructions->push_tail(var);
2836 /* Parameter declarations do not have r-values.
2843 ast_parameter_declarator::parameters_to_hir(exec_list *ast_parameters,
2845 exec_list *ir_parameters,
2846 _mesa_glsl_parse_state *state)
2848 ast_parameter_declarator *void_param = NULL;
2851 foreach_list_typed (ast_parameter_declarator, param, link, ast_parameters) {
2852 param->formal_parameter = formal;
2853 param->hir(ir_parameters, state);
2861 if ((void_param != NULL) && (count > 1)) {
2862 YYLTYPE loc = void_param->get_location();
2864 _mesa_glsl_error(& loc, state,
2865 "`void' parameter must be only parameter");
2871 emit_function(_mesa_glsl_parse_state *state, exec_list *instructions,
2874 /* Emit the new function header */
2875 if (state->current_function == NULL) {
2876 instructions->push_tail(f);
2878 /* IR invariants disallow function declarations or definitions nested
2879 * within other function definitions. Insert the new ir_function
2880 * block in the instruction sequence before the ir_function block
2881 * containing the current ir_function_signature.
2883 ir_function *const curr =
2884 const_cast<ir_function *>(state->current_function->function());
2886 curr->insert_before(f);
2892 ast_function::hir(exec_list *instructions,
2893 struct _mesa_glsl_parse_state *state)
2896 ir_function *f = NULL;
2897 ir_function_signature *sig = NULL;
2898 exec_list hir_parameters;
2900 const char *const name = identifier;
2902 /* From page 21 (page 27 of the PDF) of the GLSL 1.20 spec,
2904 * "Function declarations (prototypes) cannot occur inside of functions;
2905 * they must be at global scope, or for the built-in functions, outside
2906 * the global scope."
2908 * From page 27 (page 33 of the PDF) of the GLSL ES 1.00.16 spec,
2910 * "User defined functions may only be defined within the global scope."
2912 * Note that this language does not appear in GLSL 1.10.
2914 if ((state->current_function != NULL) && (state->language_version != 110)) {
2915 YYLTYPE loc = this->get_location();
2916 _mesa_glsl_error(&loc, state,
2917 "declaration of function `%s' not allowed within "
2918 "function body", name);
2921 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
2923 * "Identifiers starting with "gl_" are reserved for use by
2924 * OpenGL, and may not be declared in a shader as either a
2925 * variable or a function."
2927 if (strncmp(name, "gl_", 3) == 0) {
2928 YYLTYPE loc = this->get_location();
2929 _mesa_glsl_error(&loc, state,
2930 "identifier `%s' uses reserved `gl_' prefix", name);
2933 /* Convert the list of function parameters to HIR now so that they can be
2934 * used below to compare this function's signature with previously seen
2935 * signatures for functions with the same name.
2937 ast_parameter_declarator::parameters_to_hir(& this->parameters,
2939 & hir_parameters, state);
2941 const char *return_type_name;
2942 const glsl_type *return_type =
2943 this->return_type->specifier->glsl_type(& return_type_name, state);
2946 YYLTYPE loc = this->get_location();
2947 _mesa_glsl_error(&loc, state,
2948 "function `%s' has undeclared return type `%s'",
2949 name, return_type_name);
2950 return_type = glsl_type::error_type;
2953 /* From page 56 (page 62 of the PDF) of the GLSL 1.30 spec:
2954 * "No qualifier is allowed on the return type of a function."
2956 if (this->return_type->has_qualifiers()) {
2957 YYLTYPE loc = this->get_location();
2958 _mesa_glsl_error(& loc, state,
2959 "function `%s' return type has qualifiers", name);
2962 /* Verify that this function's signature either doesn't match a previously
2963 * seen signature for a function with the same name, or, if a match is found,
2964 * that the previously seen signature does not have an associated definition.
2966 f = state->symbols->get_function(name);
2967 if (f != NULL && (state->es_shader || f->has_user_signature())) {
2968 sig = f->exact_matching_signature(&hir_parameters);
2970 const char *badvar = sig->qualifiers_match(&hir_parameters);
2971 if (badvar != NULL) {
2972 YYLTYPE loc = this->get_location();
2974 _mesa_glsl_error(&loc, state, "function `%s' parameter `%s' "
2975 "qualifiers don't match prototype", name, badvar);
2978 if (sig->return_type != return_type) {
2979 YYLTYPE loc = this->get_location();
2981 _mesa_glsl_error(&loc, state, "function `%s' return type doesn't "
2982 "match prototype", name);
2985 if (is_definition && sig->is_defined) {
2986 YYLTYPE loc = this->get_location();
2988 _mesa_glsl_error(& loc, state, "function `%s' redefined", name);
2992 f = new(ctx) ir_function(name);
2993 if (!state->symbols->add_function(f)) {
2994 /* This function name shadows a non-function use of the same name. */
2995 YYLTYPE loc = this->get_location();
2997 _mesa_glsl_error(&loc, state, "function name `%s' conflicts with "
2998 "non-function", name);
3002 emit_function(state, instructions, f);
3005 /* Verify the return type of main() */
3006 if (strcmp(name, "main") == 0) {
3007 if (! return_type->is_void()) {
3008 YYLTYPE loc = this->get_location();
3010 _mesa_glsl_error(& loc, state, "main() must return void");
3013 if (!hir_parameters.is_empty()) {
3014 YYLTYPE loc = this->get_location();
3016 _mesa_glsl_error(& loc, state, "main() must not take any parameters");
3020 /* Finish storing the information about this new function in its signature.
3023 sig = new(ctx) ir_function_signature(return_type);
3024 f->add_signature(sig);
3027 sig->replace_parameters(&hir_parameters);
3030 /* Function declarations (prototypes) do not have r-values.
3037 ast_function_definition::hir(exec_list *instructions,
3038 struct _mesa_glsl_parse_state *state)
3040 prototype->is_definition = true;
3041 prototype->hir(instructions, state);
3043 ir_function_signature *signature = prototype->signature;
3044 if (signature == NULL)
3047 assert(state->current_function == NULL);
3048 state->current_function = signature;
3049 state->found_return = false;
3051 /* Duplicate parameters declared in the prototype as concrete variables.
3052 * Add these to the symbol table.
3054 state->symbols->push_scope();
3055 foreach_iter(exec_list_iterator, iter, signature->parameters) {
3056 ir_variable *const var = ((ir_instruction *) iter.get())->as_variable();
3058 assert(var != NULL);
3060 /* The only way a parameter would "exist" is if two parameters have
3063 if (state->symbols->name_declared_this_scope(var->name)) {
3064 YYLTYPE loc = this->get_location();
3066 _mesa_glsl_error(& loc, state, "parameter `%s' redeclared", var->name);
3068 state->symbols->add_variable(var);
3072 /* Convert the body of the function to HIR. */
3073 this->body->hir(&signature->body, state);
3074 signature->is_defined = true;
3076 state->symbols->pop_scope();
3078 assert(state->current_function == signature);
3079 state->current_function = NULL;
3081 if (!signature->return_type->is_void() && !state->found_return) {
3082 YYLTYPE loc = this->get_location();
3083 _mesa_glsl_error(& loc, state, "function `%s' has non-void return type "
3084 "%s, but no return statement",
3085 signature->function_name(),
3086 signature->return_type->name);
3089 /* Function definitions do not have r-values.
3096 ast_jump_statement::hir(exec_list *instructions,
3097 struct _mesa_glsl_parse_state *state)
3104 assert(state->current_function);
3106 if (opt_return_value) {
3107 ir_rvalue *const ret = opt_return_value->hir(instructions, state);
3109 /* The value of the return type can be NULL if the shader says
3110 * 'return foo();' and foo() is a function that returns void.
3112 * NOTE: The GLSL spec doesn't say that this is an error. The type
3113 * of the return value is void. If the return type of the function is
3114 * also void, then this should compile without error. Seriously.
3116 const glsl_type *const ret_type =
3117 (ret == NULL) ? glsl_type::void_type : ret->type;
3119 /* Implicit conversions are not allowed for return values. */
3120 if (state->current_function->return_type != ret_type) {
3121 YYLTYPE loc = this->get_location();
3123 _mesa_glsl_error(& loc, state,
3124 "`return' with wrong type %s, in function `%s' "
3127 state->current_function->function_name(),
3128 state->current_function->return_type->name);
3131 inst = new(ctx) ir_return(ret);
3133 if (state->current_function->return_type->base_type !=
3135 YYLTYPE loc = this->get_location();
3137 _mesa_glsl_error(& loc, state,
3138 "`return' with no value, in function %s returning "
3140 state->current_function->function_name());
3142 inst = new(ctx) ir_return;
3145 state->found_return = true;
3146 instructions->push_tail(inst);
3151 if (state->target != fragment_shader) {
3152 YYLTYPE loc = this->get_location();
3154 _mesa_glsl_error(& loc, state,
3155 "`discard' may only appear in a fragment shader");
3157 instructions->push_tail(new(ctx) ir_discard);
3162 /* FINISHME: Handle switch-statements. They cannot contain 'continue',
3163 * FINISHME: and they use a different IR instruction for 'break'.
3165 /* FINISHME: Correctly handle the nesting. If a switch-statement is
3166 * FINISHME: inside a loop, a 'continue' is valid and will bind to the
3169 if (state->loop_or_switch_nesting == NULL) {
3170 YYLTYPE loc = this->get_location();
3172 _mesa_glsl_error(& loc, state,
3173 "`%s' may only appear in a loop",
3174 (mode == ast_break) ? "break" : "continue");
3176 ir_loop *const loop = state->loop_or_switch_nesting->as_loop();
3178 /* Inline the for loop expression again, since we don't know
3179 * where near the end of the loop body the normal copy of it
3180 * is going to be placed.
3182 if (mode == ast_continue &&
3183 state->loop_or_switch_nesting_ast->rest_expression) {
3184 state->loop_or_switch_nesting_ast->rest_expression->hir(instructions,
3189 ir_loop_jump *const jump =
3190 new(ctx) ir_loop_jump((mode == ast_break)
3191 ? ir_loop_jump::jump_break
3192 : ir_loop_jump::jump_continue);
3193 instructions->push_tail(jump);
3200 /* Jump instructions do not have r-values.
3207 ast_selection_statement::hir(exec_list *instructions,
3208 struct _mesa_glsl_parse_state *state)
3212 ir_rvalue *const condition = this->condition->hir(instructions, state);
3214 /* From page 66 (page 72 of the PDF) of the GLSL 1.50 spec:
3216 * "Any expression whose type evaluates to a Boolean can be used as the
3217 * conditional expression bool-expression. Vector types are not accepted
3218 * as the expression to if."
3220 * The checks are separated so that higher quality diagnostics can be
3221 * generated for cases where both rules are violated.
3223 if (!condition->type->is_boolean() || !condition->type->is_scalar()) {
3224 YYLTYPE loc = this->condition->get_location();
3226 _mesa_glsl_error(& loc, state, "if-statement condition must be scalar "
3230 ir_if *const stmt = new(ctx) ir_if(condition);
3232 if (then_statement != NULL) {
3233 state->symbols->push_scope();
3234 then_statement->hir(& stmt->then_instructions, state);
3235 state->symbols->pop_scope();
3238 if (else_statement != NULL) {
3239 state->symbols->push_scope();
3240 else_statement->hir(& stmt->else_instructions, state);
3241 state->symbols->pop_scope();
3244 instructions->push_tail(stmt);
3246 /* if-statements do not have r-values.
3253 ast_iteration_statement::condition_to_hir(ir_loop *stmt,
3254 struct _mesa_glsl_parse_state *state)
3258 if (condition != NULL) {
3259 ir_rvalue *const cond =
3260 condition->hir(& stmt->body_instructions, state);
3263 || !cond->type->is_boolean() || !cond->type->is_scalar()) {
3264 YYLTYPE loc = condition->get_location();
3266 _mesa_glsl_error(& loc, state,
3267 "loop condition must be scalar boolean");
3269 /* As the first code in the loop body, generate a block that looks
3270 * like 'if (!condition) break;' as the loop termination condition.
3272 ir_rvalue *const not_cond =
3273 new(ctx) ir_expression(ir_unop_logic_not, glsl_type::bool_type, cond,
3276 ir_if *const if_stmt = new(ctx) ir_if(not_cond);
3278 ir_jump *const break_stmt =
3279 new(ctx) ir_loop_jump(ir_loop_jump::jump_break);
3281 if_stmt->then_instructions.push_tail(break_stmt);
3282 stmt->body_instructions.push_tail(if_stmt);
3289 ast_iteration_statement::hir(exec_list *instructions,
3290 struct _mesa_glsl_parse_state *state)
3294 /* For-loops and while-loops start a new scope, but do-while loops do not.
3296 if (mode != ast_do_while)
3297 state->symbols->push_scope();
3299 if (init_statement != NULL)
3300 init_statement->hir(instructions, state);
3302 ir_loop *const stmt = new(ctx) ir_loop();
3303 instructions->push_tail(stmt);
3305 /* Track the current loop and / or switch-statement nesting.
3307 ir_instruction *const nesting = state->loop_or_switch_nesting;
3308 ast_iteration_statement *nesting_ast = state->loop_or_switch_nesting_ast;
3310 state->loop_or_switch_nesting = stmt;
3311 state->loop_or_switch_nesting_ast = this;
3313 if (mode != ast_do_while)
3314 condition_to_hir(stmt, state);
3317 body->hir(& stmt->body_instructions, state);
3319 if (rest_expression != NULL)
3320 rest_expression->hir(& stmt->body_instructions, state);
3322 if (mode == ast_do_while)
3323 condition_to_hir(stmt, state);
3325 if (mode != ast_do_while)
3326 state->symbols->pop_scope();
3328 /* Restore previous nesting before returning.
3330 state->loop_or_switch_nesting = nesting;
3331 state->loop_or_switch_nesting_ast = nesting_ast;
3333 /* Loops do not have r-values.
3340 ast_type_specifier::hir(exec_list *instructions,
3341 struct _mesa_glsl_parse_state *state)
3343 if (!this->is_precision_statement && this->structure == NULL)
3346 YYLTYPE loc = this->get_location();
3348 if (this->precision != ast_precision_none
3349 && state->language_version != 100
3350 && state->language_version < 130) {
3351 _mesa_glsl_error(&loc, state,
3352 "precision qualifiers exist only in "
3353 "GLSL ES 1.00, and GLSL 1.30 and later");
3356 if (this->precision != ast_precision_none
3357 && this->structure != NULL) {
3358 _mesa_glsl_error(&loc, state,
3359 "precision qualifiers do not apply to structures");
3363 /* If this is a precision statement, check that the type to which it is
3364 * applied is either float or int.
3366 * From section 4.5.3 of the GLSL 1.30 spec:
3367 * "The precision statement
3368 * precision precision-qualifier type;
3369 * can be used to establish a default precision qualifier. The type
3370 * field can be either int or float [...]. Any other types or
3371 * qualifiers will result in an error.
3373 if (this->is_precision_statement) {
3374 assert(this->precision != ast_precision_none);
3375 assert(this->structure == NULL); /* The check for structures was
3376 * performed above. */
3377 if (this->is_array) {
3378 _mesa_glsl_error(&loc, state,
3379 "default precision statements do not apply to "
3383 if (this->type_specifier != ast_float
3384 && this->type_specifier != ast_int) {
3385 _mesa_glsl_error(&loc, state,
3386 "default precision statements apply only to types "
3391 /* FINISHME: Translate precision statements into IR. */
3395 if (this->structure != NULL)
3396 return this->structure->hir(instructions, state);
3403 ast_struct_specifier::hir(exec_list *instructions,
3404 struct _mesa_glsl_parse_state *state)
3406 unsigned decl_count = 0;
3408 /* Make an initial pass over the list of structure fields to determine how
3409 * many there are. Each element in this list is an ast_declarator_list.
3410 * This means that we actually need to count the number of elements in the
3411 * 'declarations' list in each of the elements.
3413 foreach_list_typed (ast_declarator_list, decl_list, link,
3414 &this->declarations) {
3415 foreach_list_const (decl_ptr, & decl_list->declarations) {
3420 /* Allocate storage for the structure fields and process the field
3421 * declarations. As the declarations are processed, try to also convert
3422 * the types to HIR. This ensures that structure definitions embedded in
3423 * other structure definitions are processed.
3425 glsl_struct_field *const fields = ralloc_array(state, glsl_struct_field,
3429 foreach_list_typed (ast_declarator_list, decl_list, link,
3430 &this->declarations) {
3431 const char *type_name;
3433 decl_list->type->specifier->hir(instructions, state);
3435 /* Section 10.9 of the GLSL ES 1.00 specification states that
3436 * embedded structure definitions have been removed from the language.
3438 if (state->es_shader && decl_list->type->specifier->structure != NULL) {
3439 YYLTYPE loc = this->get_location();
3440 _mesa_glsl_error(&loc, state, "Embedded structure definitions are "
3441 "not allowed in GLSL ES 1.00.");
3444 const glsl_type *decl_type =
3445 decl_list->type->specifier->glsl_type(& type_name, state);
3447 foreach_list_typed (ast_declaration, decl, link,
3448 &decl_list->declarations) {
3449 const struct glsl_type *field_type = decl_type;
3450 if (decl->is_array) {
3451 YYLTYPE loc = decl->get_location();
3452 field_type = process_array_type(&loc, decl_type, decl->array_size,
3455 fields[i].type = (field_type != NULL)
3456 ? field_type : glsl_type::error_type;
3457 fields[i].name = decl->identifier;
3462 assert(i == decl_count);
3464 const glsl_type *t =
3465 glsl_type::get_record_instance(fields, decl_count, this->name);
3467 YYLTYPE loc = this->get_location();
3468 if (!state->symbols->add_type(name, t)) {
3469 _mesa_glsl_error(& loc, state, "struct `%s' previously defined", name);
3471 const glsl_type **s = reralloc(state, state->user_structures,
3473 state->num_user_structures + 1);
3475 s[state->num_user_structures] = t;
3476 state->user_structures = s;
3477 state->num_user_structures++;
3481 /* Structure type definitions do not have r-values.