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16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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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 /* From GLSL 1.50 spec, page 56:
439 * "The operator modulus (%) operates on signed or unsigned integers or
440 * integer vectors. The operand types must both be signed or both be
443 if (!type_a->is_integer() || !type_b->is_integer()
444 || (type_a->base_type != type_b->base_type)) {
445 _mesa_glsl_error(loc, state, "type mismatch");
446 return glsl_type::error_type;
449 /* "The operands cannot be vectors of differing size. If one operand is
450 * a scalar and the other vector, then the scalar is applied component-
451 * wise to the vector, resulting in the same type as the vector. If both
452 * are vectors of the same size, the result is computed component-wise."
454 if (type_a->is_vector()) {
455 if (!type_b->is_vector()
456 || (type_a->vector_elements == type_b->vector_elements))
461 /* "The operator modulus (%) is not defined for any other data types
462 * (non-integer types)."
464 _mesa_glsl_error(loc, state, "type mismatch");
465 return glsl_type::error_type;
469 static const struct glsl_type *
470 relational_result_type(ir_rvalue * &value_a, ir_rvalue * &value_b,
471 struct _mesa_glsl_parse_state *state, YYLTYPE *loc)
473 const glsl_type *type_a = value_a->type;
474 const glsl_type *type_b = value_b->type;
476 /* From GLSL 1.50 spec, page 56:
477 * "The relational operators greater than (>), less than (<), greater
478 * than or equal (>=), and less than or equal (<=) operate only on
479 * scalar integer and scalar floating-point expressions."
481 if (!type_a->is_numeric()
482 || !type_b->is_numeric()
483 || !type_a->is_scalar()
484 || !type_b->is_scalar()) {
485 _mesa_glsl_error(loc, state,
486 "Operands to relational operators must be scalar and "
488 return glsl_type::error_type;
491 /* "Either the operands' types must match, or the conversions from
492 * Section 4.1.10 "Implicit Conversions" will be applied to the integer
493 * operand, after which the types must match."
495 if (!apply_implicit_conversion(type_a, value_b, state)
496 && !apply_implicit_conversion(type_b, value_a, state)) {
497 _mesa_glsl_error(loc, state,
498 "Could not implicitly convert operands to "
499 "relational operator");
500 return glsl_type::error_type;
502 type_a = value_a->type;
503 type_b = value_b->type;
505 if (type_a->base_type != type_b->base_type) {
506 _mesa_glsl_error(loc, state, "base type mismatch");
507 return glsl_type::error_type;
510 /* "The result is scalar Boolean."
512 return glsl_type::bool_type;
516 * \brief Return the result type of a bit-shift operation.
518 * If the given types to the bit-shift operator are invalid, return
519 * glsl_type::error_type.
521 * \param type_a Type of LHS of bit-shift op
522 * \param type_b Type of RHS of bit-shift op
524 static const struct glsl_type *
525 shift_result_type(const struct glsl_type *type_a,
526 const struct glsl_type *type_b,
528 struct _mesa_glsl_parse_state *state, YYLTYPE *loc)
530 if (state->language_version < 130) {
531 _mesa_glsl_error(loc, state, "bit operations require GLSL 1.30");
532 return glsl_type::error_type;
535 /* From page 50 (page 56 of the PDF) of the GLSL 1.30 spec:
537 * "The shift operators (<<) and (>>). For both operators, the operands
538 * must be signed or unsigned integers or integer vectors. One operand
539 * can be signed while the other is unsigned."
541 if (!type_a->is_integer()) {
542 _mesa_glsl_error(loc, state, "LHS of operator %s must be an integer or "
543 "integer vector", ast_expression::operator_string(op));
544 return glsl_type::error_type;
547 if (!type_b->is_integer()) {
548 _mesa_glsl_error(loc, state, "RHS of operator %s must be an integer or "
549 "integer vector", ast_expression::operator_string(op));
550 return glsl_type::error_type;
553 /* "If the first operand is a scalar, the second operand has to be
556 if (type_a->is_scalar() && !type_b->is_scalar()) {
557 _mesa_glsl_error(loc, state, "If the first operand of %s is scalar, the "
558 "second must be scalar as well",
559 ast_expression::operator_string(op));
560 return glsl_type::error_type;
563 /* If both operands are vectors, check that they have same number of
566 if (type_a->is_vector() &&
567 type_b->is_vector() &&
568 type_a->vector_elements != type_b->vector_elements) {
569 _mesa_glsl_error(loc, state, "Vector operands to operator %s must "
570 "have same number of elements",
571 ast_expression::operator_string(op));
572 return glsl_type::error_type;
575 /* "In all cases, the resulting type will be the same type as the left
582 * Validates that a value can be assigned to a location with a specified type
584 * Validates that \c rhs can be assigned to some location. If the types are
585 * not an exact match but an automatic conversion is possible, \c rhs will be
589 * \c NULL if \c rhs cannot be assigned to a location with type \c lhs_type.
590 * Otherwise the actual RHS to be assigned will be returned. This may be
591 * \c rhs, or it may be \c rhs after some type conversion.
594 * In addition to being used for assignments, this function is used to
595 * type-check return values.
598 validate_assignment(struct _mesa_glsl_parse_state *state,
599 const glsl_type *lhs_type, ir_rvalue *rhs)
601 /* If there is already some error in the RHS, just return it. Anything
602 * else will lead to an avalanche of error message back to the user.
604 if (rhs->type->is_error())
607 /* If the types are identical, the assignment can trivially proceed.
609 if (rhs->type == lhs_type)
612 /* If the array element types are the same and the size of the LHS is zero,
613 * the assignment is okay.
615 * Note: Whole-array assignments are not permitted in GLSL 1.10, but this
616 * is handled by ir_dereference::is_lvalue.
618 if (lhs_type->is_array() && rhs->type->is_array()
619 && (lhs_type->element_type() == rhs->type->element_type())
620 && (lhs_type->array_size() == 0)) {
624 /* Check for implicit conversion in GLSL 1.20 */
625 if (apply_implicit_conversion(lhs_type, rhs, state)) {
626 if (rhs->type == lhs_type)
634 do_assignment(exec_list *instructions, struct _mesa_glsl_parse_state *state,
635 ir_rvalue *lhs, ir_rvalue *rhs,
639 bool error_emitted = (lhs->type->is_error() || rhs->type->is_error());
641 if (!error_emitted) {
642 if (!lhs->is_lvalue()) {
643 _mesa_glsl_error(& lhs_loc, state, "non-lvalue in assignment");
644 error_emitted = true;
647 if (state->es_shader && lhs->type->is_array()) {
648 _mesa_glsl_error(&lhs_loc, state, "whole array assignment is not "
649 "allowed in GLSL ES 1.00.");
650 error_emitted = true;
654 ir_rvalue *new_rhs = validate_assignment(state, lhs->type, rhs);
655 if (new_rhs == NULL) {
656 _mesa_glsl_error(& lhs_loc, state, "type mismatch");
660 /* If the LHS array was not declared with a size, it takes it size from
661 * the RHS. If the LHS is an l-value and a whole array, it must be a
662 * dereference of a variable. Any other case would require that the LHS
663 * is either not an l-value or not a whole array.
665 if (lhs->type->array_size() == 0) {
666 ir_dereference *const d = lhs->as_dereference();
670 ir_variable *const var = d->variable_referenced();
674 if (var->max_array_access >= unsigned(rhs->type->array_size())) {
675 /* FINISHME: This should actually log the location of the RHS. */
676 _mesa_glsl_error(& lhs_loc, state, "array size must be > %u due to "
678 var->max_array_access);
681 var->type = glsl_type::get_array_instance(lhs->type->element_type(),
682 rhs->type->array_size());
687 /* Most callers of do_assignment (assign, add_assign, pre_inc/dec,
688 * but not post_inc) need the converted assigned value as an rvalue
689 * to handle things like:
693 * So we always just store the computed value being assigned to a
694 * temporary and return a deref of that temporary. If the rvalue
695 * ends up not being used, the temp will get copy-propagated out.
697 ir_variable *var = new(ctx) ir_variable(rhs->type, "assignment_tmp",
699 ir_dereference_variable *deref_var = new(ctx) ir_dereference_variable(var);
700 instructions->push_tail(var);
701 instructions->push_tail(new(ctx) ir_assignment(deref_var,
704 deref_var = new(ctx) ir_dereference_variable(var);
707 instructions->push_tail(new(ctx) ir_assignment(lhs, deref_var, NULL));
709 return new(ctx) ir_dereference_variable(var);
713 get_lvalue_copy(exec_list *instructions, ir_rvalue *lvalue)
715 void *ctx = talloc_parent(lvalue);
718 var = new(ctx) ir_variable(lvalue->type, "_post_incdec_tmp",
720 instructions->push_tail(var);
721 var->mode = ir_var_auto;
723 instructions->push_tail(new(ctx) ir_assignment(new(ctx) ir_dereference_variable(var),
726 /* Once we've created this temporary, mark it read only so it's no
727 * longer considered an lvalue.
729 var->read_only = true;
731 return new(ctx) ir_dereference_variable(var);
736 ast_node::hir(exec_list *instructions,
737 struct _mesa_glsl_parse_state *state)
746 mark_whole_array_access(ir_rvalue *access)
748 ir_dereference_variable *deref = access->as_dereference_variable();
751 deref->var->max_array_access = deref->type->length - 1;
756 do_comparison(void *mem_ctx, int operation, ir_rvalue *op0, ir_rvalue *op1)
759 ir_rvalue *cmp = NULL;
761 if (operation == ir_binop_all_equal)
762 join_op = ir_binop_logic_and;
764 join_op = ir_binop_logic_or;
766 switch (op0->type->base_type) {
767 case GLSL_TYPE_FLOAT:
771 return new(mem_ctx) ir_expression(operation, op0, op1);
773 case GLSL_TYPE_ARRAY: {
774 for (unsigned int i = 0; i < op0->type->length; i++) {
775 ir_rvalue *e0, *e1, *result;
777 e0 = new(mem_ctx) ir_dereference_array(op0->clone(mem_ctx, NULL),
778 new(mem_ctx) ir_constant(i));
779 e1 = new(mem_ctx) ir_dereference_array(op1->clone(mem_ctx, NULL),
780 new(mem_ctx) ir_constant(i));
781 result = do_comparison(mem_ctx, operation, e0, e1);
784 cmp = new(mem_ctx) ir_expression(join_op, cmp, result);
790 mark_whole_array_access(op0);
791 mark_whole_array_access(op1);
795 case GLSL_TYPE_STRUCT: {
796 for (unsigned int i = 0; i < op0->type->length; i++) {
797 ir_rvalue *e0, *e1, *result;
798 const char *field_name = op0->type->fields.structure[i].name;
800 e0 = new(mem_ctx) ir_dereference_record(op0->clone(mem_ctx, NULL),
802 e1 = new(mem_ctx) ir_dereference_record(op1->clone(mem_ctx, NULL),
804 result = do_comparison(mem_ctx, operation, e0, e1);
807 cmp = new(mem_ctx) ir_expression(join_op, cmp, result);
815 case GLSL_TYPE_ERROR:
817 case GLSL_TYPE_SAMPLER:
818 /* I assume a comparison of a struct containing a sampler just
819 * ignores the sampler present in the type.
824 assert(!"Should not get here.");
829 cmp = new(mem_ctx) ir_constant(true);
835 ast_expression::hir(exec_list *instructions,
836 struct _mesa_glsl_parse_state *state)
839 static const int operations[AST_NUM_OPERATORS] = {
840 -1, /* ast_assign doesn't convert to ir_expression. */
841 -1, /* ast_plus doesn't convert to ir_expression. */
865 /* Note: The following block of expression types actually convert
866 * to multiple IR instructions.
868 ir_binop_mul, /* ast_mul_assign */
869 ir_binop_div, /* ast_div_assign */
870 ir_binop_mod, /* ast_mod_assign */
871 ir_binop_add, /* ast_add_assign */
872 ir_binop_sub, /* ast_sub_assign */
873 ir_binop_lshift, /* ast_ls_assign */
874 ir_binop_rshift, /* ast_rs_assign */
875 ir_binop_bit_and, /* ast_and_assign */
876 ir_binop_bit_xor, /* ast_xor_assign */
877 ir_binop_bit_or, /* ast_or_assign */
879 -1, /* ast_conditional doesn't convert to ir_expression. */
880 ir_binop_add, /* ast_pre_inc. */
881 ir_binop_sub, /* ast_pre_dec. */
882 ir_binop_add, /* ast_post_inc. */
883 ir_binop_sub, /* ast_post_dec. */
884 -1, /* ast_field_selection doesn't conv to ir_expression. */
885 -1, /* ast_array_index doesn't convert to ir_expression. */
886 -1, /* ast_function_call doesn't conv to ir_expression. */
887 -1, /* ast_identifier doesn't convert to ir_expression. */
888 -1, /* ast_int_constant doesn't convert to ir_expression. */
889 -1, /* ast_uint_constant doesn't conv to ir_expression. */
890 -1, /* ast_float_constant doesn't conv to ir_expression. */
891 -1, /* ast_bool_constant doesn't conv to ir_expression. */
892 -1, /* ast_sequence doesn't convert to ir_expression. */
894 ir_rvalue *result = NULL;
896 const struct glsl_type *type = glsl_type::error_type;
897 bool error_emitted = false;
900 loc = this->get_location();
902 switch (this->oper) {
904 op[0] = this->subexpressions[0]->hir(instructions, state);
905 op[1] = this->subexpressions[1]->hir(instructions, state);
907 result = do_assignment(instructions, state, op[0], op[1],
908 this->subexpressions[0]->get_location());
909 error_emitted = result->type->is_error();
915 op[0] = this->subexpressions[0]->hir(instructions, state);
917 type = unary_arithmetic_result_type(op[0]->type, state, & loc);
919 error_emitted = type->is_error();
925 op[0] = this->subexpressions[0]->hir(instructions, state);
927 type = unary_arithmetic_result_type(op[0]->type, state, & loc);
929 error_emitted = type->is_error();
931 result = new(ctx) ir_expression(operations[this->oper], type,
939 op[0] = this->subexpressions[0]->hir(instructions, state);
940 op[1] = this->subexpressions[1]->hir(instructions, state);
942 type = arithmetic_result_type(op[0], op[1],
943 (this->oper == ast_mul),
945 error_emitted = type->is_error();
947 result = new(ctx) ir_expression(operations[this->oper], type,
952 op[0] = this->subexpressions[0]->hir(instructions, state);
953 op[1] = this->subexpressions[1]->hir(instructions, state);
955 type = modulus_result_type(op[0]->type, op[1]->type, state, & loc);
957 assert(operations[this->oper] == ir_binop_mod);
959 result = new(ctx) ir_expression(operations[this->oper], type,
961 error_emitted = type->is_error();
966 if (state->language_version < 130) {
967 _mesa_glsl_error(&loc, state, "operator %s requires GLSL 1.30",
968 operator_string(this->oper));
969 error_emitted = true;
972 op[0] = this->subexpressions[0]->hir(instructions, state);
973 op[1] = this->subexpressions[1]->hir(instructions, state);
974 type = shift_result_type(op[0]->type, op[1]->type, this->oper, state,
976 result = new(ctx) ir_expression(operations[this->oper], type,
978 error_emitted = op[0]->type->is_error() || op[1]->type->is_error();
985 op[0] = this->subexpressions[0]->hir(instructions, state);
986 op[1] = this->subexpressions[1]->hir(instructions, state);
988 type = relational_result_type(op[0], op[1], state, & loc);
990 /* The relational operators must either generate an error or result
991 * in a scalar boolean. See page 57 of the GLSL 1.50 spec.
993 assert(type->is_error()
994 || ((type->base_type == GLSL_TYPE_BOOL)
995 && type->is_scalar()));
997 result = new(ctx) ir_expression(operations[this->oper], type,
999 error_emitted = type->is_error();
1004 op[0] = this->subexpressions[0]->hir(instructions, state);
1005 op[1] = this->subexpressions[1]->hir(instructions, state);
1007 /* From page 58 (page 64 of the PDF) of the GLSL 1.50 spec:
1009 * "The equality operators equal (==), and not equal (!=)
1010 * operate on all types. They result in a scalar Boolean. If
1011 * the operand types do not match, then there must be a
1012 * conversion from Section 4.1.10 "Implicit Conversions"
1013 * applied to one operand that can make them match, in which
1014 * case this conversion is done."
1016 if ((!apply_implicit_conversion(op[0]->type, op[1], state)
1017 && !apply_implicit_conversion(op[1]->type, op[0], state))
1018 || (op[0]->type != op[1]->type)) {
1019 _mesa_glsl_error(& loc, state, "operands of `%s' must have the same "
1020 "type", (this->oper == ast_equal) ? "==" : "!=");
1021 error_emitted = true;
1022 } else if ((state->language_version <= 110)
1023 && (op[0]->type->is_array() || op[1]->type->is_array())) {
1024 _mesa_glsl_error(& loc, state, "array comparisons forbidden in "
1026 error_emitted = true;
1029 result = do_comparison(ctx, operations[this->oper], op[0], op[1]);
1030 type = glsl_type::bool_type;
1032 assert(error_emitted || (result->type == glsl_type::bool_type));
1038 op[0] = this->subexpressions[0]->hir(instructions, state);
1039 op[1] = this->subexpressions[1]->hir(instructions, state);
1040 type = bit_logic_result_type(op[0]->type, op[1]->type, this->oper,
1042 result = new(ctx) ir_expression(operations[this->oper], type,
1044 error_emitted = op[0]->type->is_error() || op[1]->type->is_error();
1048 op[0] = this->subexpressions[0]->hir(instructions, state);
1050 if (state->language_version < 130) {
1051 _mesa_glsl_error(&loc, state, "bit-wise operations require GLSL 1.30");
1052 error_emitted = true;
1055 if (!op[0]->type->is_integer()) {
1056 _mesa_glsl_error(&loc, state, "operand of `~' must be an integer");
1057 error_emitted = true;
1061 result = new(ctx) ir_expression(ir_unop_bit_not, type, op[0], NULL);
1064 case ast_logic_and: {
1065 op[0] = this->subexpressions[0]->hir(instructions, state);
1067 if (!op[0]->type->is_boolean() || !op[0]->type->is_scalar()) {
1068 YYLTYPE loc = this->subexpressions[0]->get_location();
1070 _mesa_glsl_error(& loc, state, "LHS of `%s' must be scalar boolean",
1071 operator_string(this->oper));
1072 error_emitted = true;
1075 ir_constant *op0_const = op[0]->constant_expression_value();
1077 if (op0_const->value.b[0]) {
1078 op[1] = this->subexpressions[1]->hir(instructions, state);
1080 if (!op[1]->type->is_boolean() || !op[1]->type->is_scalar()) {
1081 YYLTYPE loc = this->subexpressions[1]->get_location();
1083 _mesa_glsl_error(& loc, state,
1084 "RHS of `%s' must be scalar boolean",
1085 operator_string(this->oper));
1086 error_emitted = true;
1092 type = glsl_type::bool_type;
1094 ir_variable *const tmp = new(ctx) ir_variable(glsl_type::bool_type,
1097 instructions->push_tail(tmp);
1099 ir_if *const stmt = new(ctx) ir_if(op[0]);
1100 instructions->push_tail(stmt);
1102 op[1] = this->subexpressions[1]->hir(&stmt->then_instructions, state);
1104 if (!op[1]->type->is_boolean() || !op[1]->type->is_scalar()) {
1105 YYLTYPE loc = this->subexpressions[1]->get_location();
1107 _mesa_glsl_error(& loc, state,
1108 "RHS of `%s' must be scalar boolean",
1109 operator_string(this->oper));
1110 error_emitted = true;
1113 ir_dereference *const then_deref = new(ctx) ir_dereference_variable(tmp);
1114 ir_assignment *const then_assign =
1115 new(ctx) ir_assignment(then_deref, op[1], NULL);
1116 stmt->then_instructions.push_tail(then_assign);
1118 ir_dereference *const else_deref = new(ctx) ir_dereference_variable(tmp);
1119 ir_assignment *const else_assign =
1120 new(ctx) ir_assignment(else_deref, new(ctx) ir_constant(false), NULL);
1121 stmt->else_instructions.push_tail(else_assign);
1123 result = new(ctx) ir_dereference_variable(tmp);
1129 case ast_logic_or: {
1130 op[0] = this->subexpressions[0]->hir(instructions, state);
1132 if (!op[0]->type->is_boolean() || !op[0]->type->is_scalar()) {
1133 YYLTYPE loc = this->subexpressions[0]->get_location();
1135 _mesa_glsl_error(& loc, state, "LHS of `%s' must be scalar boolean",
1136 operator_string(this->oper));
1137 error_emitted = true;
1140 ir_constant *op0_const = op[0]->constant_expression_value();
1142 if (op0_const->value.b[0]) {
1145 op[1] = this->subexpressions[1]->hir(instructions, state);
1147 if (!op[1]->type->is_boolean() || !op[1]->type->is_scalar()) {
1148 YYLTYPE loc = this->subexpressions[1]->get_location();
1150 _mesa_glsl_error(& loc, state,
1151 "RHS of `%s' must be scalar boolean",
1152 operator_string(this->oper));
1153 error_emitted = true;
1157 type = glsl_type::bool_type;
1159 ir_variable *const tmp = new(ctx) ir_variable(glsl_type::bool_type,
1162 instructions->push_tail(tmp);
1164 ir_if *const stmt = new(ctx) ir_if(op[0]);
1165 instructions->push_tail(stmt);
1167 op[1] = this->subexpressions[1]->hir(&stmt->else_instructions, state);
1169 if (!op[1]->type->is_boolean() || !op[1]->type->is_scalar()) {
1170 YYLTYPE loc = this->subexpressions[1]->get_location();
1172 _mesa_glsl_error(& loc, state, "RHS of `%s' must be scalar boolean",
1173 operator_string(this->oper));
1174 error_emitted = true;
1177 ir_dereference *const then_deref = new(ctx) ir_dereference_variable(tmp);
1178 ir_assignment *const then_assign =
1179 new(ctx) ir_assignment(then_deref, new(ctx) ir_constant(true), NULL);
1180 stmt->then_instructions.push_tail(then_assign);
1182 ir_dereference *const else_deref = new(ctx) ir_dereference_variable(tmp);
1183 ir_assignment *const else_assign =
1184 new(ctx) ir_assignment(else_deref, op[1], NULL);
1185 stmt->else_instructions.push_tail(else_assign);
1187 result = new(ctx) ir_dereference_variable(tmp);
1194 op[0] = this->subexpressions[0]->hir(instructions, state);
1195 op[1] = this->subexpressions[1]->hir(instructions, state);
1198 result = new(ctx) ir_expression(operations[this->oper], glsl_type::bool_type,
1200 type = glsl_type::bool_type;
1204 op[0] = this->subexpressions[0]->hir(instructions, state);
1206 if (!op[0]->type->is_boolean() || !op[0]->type->is_scalar()) {
1207 YYLTYPE loc = this->subexpressions[0]->get_location();
1209 _mesa_glsl_error(& loc, state,
1210 "operand of `!' must be scalar boolean");
1211 error_emitted = true;
1214 result = new(ctx) ir_expression(operations[this->oper], glsl_type::bool_type,
1216 type = glsl_type::bool_type;
1219 case ast_mul_assign:
1220 case ast_div_assign:
1221 case ast_add_assign:
1222 case ast_sub_assign: {
1223 op[0] = this->subexpressions[0]->hir(instructions, state);
1224 op[1] = this->subexpressions[1]->hir(instructions, state);
1226 type = arithmetic_result_type(op[0], op[1],
1227 (this->oper == ast_mul_assign),
1230 ir_rvalue *temp_rhs = new(ctx) ir_expression(operations[this->oper], type,
1233 result = do_assignment(instructions, state,
1234 op[0]->clone(ctx, NULL), temp_rhs,
1235 this->subexpressions[0]->get_location());
1236 type = result->type;
1237 error_emitted = (op[0]->type->is_error());
1239 /* GLSL 1.10 does not allow array assignment. However, we don't have to
1240 * explicitly test for this because none of the binary expression
1241 * operators allow array operands either.
1247 case ast_mod_assign: {
1248 op[0] = this->subexpressions[0]->hir(instructions, state);
1249 op[1] = this->subexpressions[1]->hir(instructions, state);
1251 type = modulus_result_type(op[0]->type, op[1]->type, state, & loc);
1253 assert(operations[this->oper] == ir_binop_mod);
1255 ir_rvalue *temp_rhs;
1256 temp_rhs = new(ctx) ir_expression(operations[this->oper], type,
1259 result = do_assignment(instructions, state,
1260 op[0]->clone(ctx, NULL), temp_rhs,
1261 this->subexpressions[0]->get_location());
1262 type = result->type;
1263 error_emitted = type->is_error();
1268 case ast_rs_assign: {
1269 op[0] = this->subexpressions[0]->hir(instructions, state);
1270 op[1] = this->subexpressions[1]->hir(instructions, state);
1271 type = shift_result_type(op[0]->type, op[1]->type, this->oper, state,
1273 ir_rvalue *temp_rhs = new(ctx) ir_expression(operations[this->oper],
1274 type, op[0], op[1]);
1275 result = do_assignment(instructions, state, op[0]->clone(ctx, NULL),
1277 this->subexpressions[0]->get_location());
1278 error_emitted = op[0]->type->is_error() || op[1]->type->is_error();
1282 case ast_and_assign:
1283 case ast_xor_assign:
1284 case ast_or_assign: {
1285 op[0] = this->subexpressions[0]->hir(instructions, state);
1286 op[1] = this->subexpressions[1]->hir(instructions, state);
1287 type = bit_logic_result_type(op[0]->type, op[1]->type, this->oper,
1289 ir_rvalue *temp_rhs = new(ctx) ir_expression(operations[this->oper],
1290 type, op[0], op[1]);
1291 result = do_assignment(instructions, state, op[0]->clone(ctx, NULL),
1293 this->subexpressions[0]->get_location());
1294 error_emitted = op[0]->type->is_error() || op[1]->type->is_error();
1298 case ast_conditional: {
1299 op[0] = this->subexpressions[0]->hir(instructions, state);
1301 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1303 * "The ternary selection operator (?:). It operates on three
1304 * expressions (exp1 ? exp2 : exp3). This operator evaluates the
1305 * first expression, which must result in a scalar Boolean."
1307 if (!op[0]->type->is_boolean() || !op[0]->type->is_scalar()) {
1308 YYLTYPE loc = this->subexpressions[0]->get_location();
1310 _mesa_glsl_error(& loc, state, "?: condition must be scalar boolean");
1311 error_emitted = true;
1314 /* The :? operator is implemented by generating an anonymous temporary
1315 * followed by an if-statement. The last instruction in each branch of
1316 * the if-statement assigns a value to the anonymous temporary. This
1317 * temporary is the r-value of the expression.
1319 exec_list then_instructions;
1320 exec_list else_instructions;
1322 op[1] = this->subexpressions[1]->hir(&then_instructions, state);
1323 op[2] = this->subexpressions[2]->hir(&else_instructions, state);
1325 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1327 * "The second and third expressions can be any type, as
1328 * long their types match, or there is a conversion in
1329 * Section 4.1.10 "Implicit Conversions" that can be applied
1330 * to one of the expressions to make their types match. This
1331 * resulting matching type is the type of the entire
1334 if ((!apply_implicit_conversion(op[1]->type, op[2], state)
1335 && !apply_implicit_conversion(op[2]->type, op[1], state))
1336 || (op[1]->type != op[2]->type)) {
1337 YYLTYPE loc = this->subexpressions[1]->get_location();
1339 _mesa_glsl_error(& loc, state, "Second and third operands of ?: "
1340 "operator must have matching types.");
1341 error_emitted = true;
1342 type = glsl_type::error_type;
1347 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1349 * "The second and third expressions must be the same type, but can
1350 * be of any type other than an array."
1352 if ((state->language_version <= 110) && type->is_array()) {
1353 _mesa_glsl_error(& loc, state, "Second and third operands of ?: "
1354 "operator must not be arrays.");
1355 error_emitted = true;
1358 ir_constant *cond_val = op[0]->constant_expression_value();
1359 ir_constant *then_val = op[1]->constant_expression_value();
1360 ir_constant *else_val = op[2]->constant_expression_value();
1362 if (then_instructions.is_empty()
1363 && else_instructions.is_empty()
1364 && (cond_val != NULL) && (then_val != NULL) && (else_val != NULL)) {
1365 result = (cond_val->value.b[0]) ? then_val : else_val;
1367 ir_variable *const tmp =
1368 new(ctx) ir_variable(type, "conditional_tmp", ir_var_temporary);
1369 instructions->push_tail(tmp);
1371 ir_if *const stmt = new(ctx) ir_if(op[0]);
1372 instructions->push_tail(stmt);
1374 then_instructions.move_nodes_to(& stmt->then_instructions);
1375 ir_dereference *const then_deref =
1376 new(ctx) ir_dereference_variable(tmp);
1377 ir_assignment *const then_assign =
1378 new(ctx) ir_assignment(then_deref, op[1], NULL);
1379 stmt->then_instructions.push_tail(then_assign);
1381 else_instructions.move_nodes_to(& stmt->else_instructions);
1382 ir_dereference *const else_deref =
1383 new(ctx) ir_dereference_variable(tmp);
1384 ir_assignment *const else_assign =
1385 new(ctx) ir_assignment(else_deref, op[2], NULL);
1386 stmt->else_instructions.push_tail(else_assign);
1388 result = new(ctx) ir_dereference_variable(tmp);
1395 op[0] = this->subexpressions[0]->hir(instructions, state);
1396 if (op[0]->type->base_type == GLSL_TYPE_FLOAT)
1397 op[1] = new(ctx) ir_constant(1.0f);
1399 op[1] = new(ctx) ir_constant(1);
1401 type = arithmetic_result_type(op[0], op[1], false, state, & loc);
1403 ir_rvalue *temp_rhs;
1404 temp_rhs = new(ctx) ir_expression(operations[this->oper], type,
1407 result = do_assignment(instructions, state,
1408 op[0]->clone(ctx, NULL), temp_rhs,
1409 this->subexpressions[0]->get_location());
1410 type = result->type;
1411 error_emitted = op[0]->type->is_error();
1416 case ast_post_dec: {
1417 op[0] = this->subexpressions[0]->hir(instructions, state);
1418 if (op[0]->type->base_type == GLSL_TYPE_FLOAT)
1419 op[1] = new(ctx) ir_constant(1.0f);
1421 op[1] = new(ctx) ir_constant(1);
1423 error_emitted = op[0]->type->is_error() || op[1]->type->is_error();
1425 type = arithmetic_result_type(op[0], op[1], false, state, & loc);
1427 ir_rvalue *temp_rhs;
1428 temp_rhs = new(ctx) ir_expression(operations[this->oper], type,
1431 /* Get a temporary of a copy of the lvalue before it's modified.
1432 * This may get thrown away later.
1434 result = get_lvalue_copy(instructions, op[0]->clone(ctx, NULL));
1436 (void)do_assignment(instructions, state,
1437 op[0]->clone(ctx, NULL), temp_rhs,
1438 this->subexpressions[0]->get_location());
1440 type = result->type;
1441 error_emitted = op[0]->type->is_error();
1445 case ast_field_selection:
1446 result = _mesa_ast_field_selection_to_hir(this, instructions, state);
1447 type = result->type;
1450 case ast_array_index: {
1451 YYLTYPE index_loc = subexpressions[1]->get_location();
1453 op[0] = subexpressions[0]->hir(instructions, state);
1454 op[1] = subexpressions[1]->hir(instructions, state);
1456 error_emitted = op[0]->type->is_error() || op[1]->type->is_error();
1458 ir_rvalue *const array = op[0];
1460 result = new(ctx) ir_dereference_array(op[0], op[1]);
1462 /* Do not use op[0] after this point. Use array.
1470 if (!array->type->is_array()
1471 && !array->type->is_matrix()
1472 && !array->type->is_vector()) {
1473 _mesa_glsl_error(& index_loc, state,
1474 "cannot dereference non-array / non-matrix / "
1476 error_emitted = true;
1479 if (!op[1]->type->is_integer()) {
1480 _mesa_glsl_error(& index_loc, state,
1481 "array index must be integer type");
1482 error_emitted = true;
1483 } else if (!op[1]->type->is_scalar()) {
1484 _mesa_glsl_error(& index_loc, state,
1485 "array index must be scalar");
1486 error_emitted = true;
1489 /* If the array index is a constant expression and the array has a
1490 * declared size, ensure that the access is in-bounds. If the array
1491 * index is not a constant expression, ensure that the array has a
1494 ir_constant *const const_index = op[1]->constant_expression_value();
1495 if (const_index != NULL) {
1496 const int idx = const_index->value.i[0];
1497 const char *type_name;
1500 if (array->type->is_matrix()) {
1501 type_name = "matrix";
1502 } else if (array->type->is_vector()) {
1503 type_name = "vector";
1505 type_name = "array";
1508 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec:
1510 * "It is illegal to declare an array with a size, and then
1511 * later (in the same shader) index the same array with an
1512 * integral constant expression greater than or equal to the
1513 * declared size. It is also illegal to index an array with a
1514 * negative constant expression."
1516 if (array->type->is_matrix()) {
1517 if (array->type->row_type()->vector_elements <= idx) {
1518 bound = array->type->row_type()->vector_elements;
1520 } else if (array->type->is_vector()) {
1521 if (array->type->vector_elements <= idx) {
1522 bound = array->type->vector_elements;
1525 if ((array->type->array_size() > 0)
1526 && (array->type->array_size() <= idx)) {
1527 bound = array->type->array_size();
1532 _mesa_glsl_error(& loc, state, "%s index must be < %u",
1534 error_emitted = true;
1535 } else if (idx < 0) {
1536 _mesa_glsl_error(& loc, state, "%s index must be >= 0",
1538 error_emitted = true;
1541 if (array->type->is_array()) {
1542 /* If the array is a variable dereference, it dereferences the
1543 * whole array, by definition. Use this to get the variable.
1545 * FINISHME: Should some methods for getting / setting / testing
1546 * FINISHME: array access limits be added to ir_dereference?
1548 ir_variable *const v = array->whole_variable_referenced();
1549 if ((v != NULL) && (unsigned(idx) > v->max_array_access))
1550 v->max_array_access = idx;
1552 } else if (array->type->array_size() == 0) {
1553 _mesa_glsl_error(&loc, state, "unsized array index must be constant");
1555 if (array->type->is_array()) {
1556 /* whole_variable_referenced can return NULL if the array is a
1557 * member of a structure. In this case it is safe to not update
1558 * the max_array_access field because it is never used for fields
1561 ir_variable *v = array->whole_variable_referenced();
1563 v->max_array_access = array->type->array_size();
1567 /* From page 23 (29 of the PDF) of the GLSL 1.30 spec:
1569 * "Samplers aggregated into arrays within a shader (using square
1570 * brackets [ ]) can only be indexed with integral constant
1571 * expressions [...]."
1573 * This restriction was added in GLSL 1.30. Shaders using earlier version
1574 * of the language should not be rejected by the compiler front-end for
1575 * using this construct. This allows useful things such as using a loop
1576 * counter as the index to an array of samplers. If the loop in unrolled,
1577 * the code should compile correctly. Instead, emit a warning.
1579 if (array->type->is_array() &&
1580 array->type->element_type()->is_sampler() &&
1581 const_index == NULL) {
1583 if (state->language_version == 100) {
1584 _mesa_glsl_warning(&loc, state,
1585 "sampler arrays indexed with non-constant "
1586 "expressions is optional in GLSL ES 1.00");
1587 } else if (state->language_version < 130) {
1588 _mesa_glsl_warning(&loc, state,
1589 "sampler arrays indexed with non-constant "
1590 "expressions is forbidden in GLSL 1.30 and "
1593 _mesa_glsl_error(&loc, state,
1594 "sampler arrays indexed with non-constant "
1595 "expressions is forbidden in GLSL 1.30 and "
1597 error_emitted = true;
1602 result->type = glsl_type::error_type;
1604 type = result->type;
1608 case ast_function_call:
1609 /* Should *NEVER* get here. ast_function_call should always be handled
1610 * by ast_function_expression::hir.
1615 case ast_identifier: {
1616 /* ast_identifier can appear several places in a full abstract syntax
1617 * tree. This particular use must be at location specified in the grammar
1618 * as 'variable_identifier'.
1621 state->symbols->get_variable(this->primary_expression.identifier);
1623 result = new(ctx) ir_dereference_variable(var);
1627 type = result->type;
1629 _mesa_glsl_error(& loc, state, "`%s' undeclared",
1630 this->primary_expression.identifier);
1632 error_emitted = true;
1637 case ast_int_constant:
1638 type = glsl_type::int_type;
1639 result = new(ctx) ir_constant(this->primary_expression.int_constant);
1642 case ast_uint_constant:
1643 type = glsl_type::uint_type;
1644 result = new(ctx) ir_constant(this->primary_expression.uint_constant);
1647 case ast_float_constant:
1648 type = glsl_type::float_type;
1649 result = new(ctx) ir_constant(this->primary_expression.float_constant);
1652 case ast_bool_constant:
1653 type = glsl_type::bool_type;
1654 result = new(ctx) ir_constant(bool(this->primary_expression.bool_constant));
1657 case ast_sequence: {
1658 /* It should not be possible to generate a sequence in the AST without
1659 * any expressions in it.
1661 assert(!this->expressions.is_empty());
1663 /* The r-value of a sequence is the last expression in the sequence. If
1664 * the other expressions in the sequence do not have side-effects (and
1665 * therefore add instructions to the instruction list), they get dropped
1668 foreach_list_typed (ast_node, ast, link, &this->expressions)
1669 result = ast->hir(instructions, state);
1671 type = result->type;
1673 /* Any errors should have already been emitted in the loop above.
1675 error_emitted = true;
1680 if (type->is_error() && !error_emitted)
1681 _mesa_glsl_error(& loc, state, "type mismatch");
1688 ast_expression_statement::hir(exec_list *instructions,
1689 struct _mesa_glsl_parse_state *state)
1691 /* It is possible to have expression statements that don't have an
1692 * expression. This is the solitary semicolon:
1694 * for (i = 0; i < 5; i++)
1697 * In this case the expression will be NULL. Test for NULL and don't do
1698 * anything in that case.
1700 if (expression != NULL)
1701 expression->hir(instructions, state);
1703 /* Statements do not have r-values.
1710 ast_compound_statement::hir(exec_list *instructions,
1711 struct _mesa_glsl_parse_state *state)
1714 state->symbols->push_scope();
1716 foreach_list_typed (ast_node, ast, link, &this->statements)
1717 ast->hir(instructions, state);
1720 state->symbols->pop_scope();
1722 /* Compound statements do not have r-values.
1728 static const glsl_type *
1729 process_array_type(YYLTYPE *loc, const glsl_type *base, ast_node *array_size,
1730 struct _mesa_glsl_parse_state *state)
1732 unsigned length = 0;
1734 /* FINISHME: Reject delcarations of multidimensional arrays. */
1736 if (array_size != NULL) {
1737 exec_list dummy_instructions;
1738 ir_rvalue *const ir = array_size->hir(& dummy_instructions, state);
1739 YYLTYPE loc = array_size->get_location();
1741 /* FINISHME: Verify that the grammar forbids side-effects in array
1742 * FINISHME: sizes. i.e., 'vec4 [x = 12] data'
1744 assert(dummy_instructions.is_empty());
1747 if (!ir->type->is_integer()) {
1748 _mesa_glsl_error(& loc, state, "array size must be integer type");
1749 } else if (!ir->type->is_scalar()) {
1750 _mesa_glsl_error(& loc, state, "array size must be scalar type");
1752 ir_constant *const size = ir->constant_expression_value();
1755 _mesa_glsl_error(& loc, state, "array size must be a "
1756 "constant valued expression");
1757 } else if (size->value.i[0] <= 0) {
1758 _mesa_glsl_error(& loc, state, "array size must be > 0");
1760 assert(size->type == ir->type);
1761 length = size->value.u[0];
1765 } else if (state->es_shader) {
1766 /* Section 10.17 of the GLSL ES 1.00 specification states that unsized
1767 * array declarations have been removed from the language.
1769 _mesa_glsl_error(loc, state, "unsized array declarations are not "
1770 "allowed in GLSL ES 1.00.");
1773 return glsl_type::get_array_instance(base, length);
1778 ast_type_specifier::glsl_type(const char **name,
1779 struct _mesa_glsl_parse_state *state) const
1781 const struct glsl_type *type;
1783 type = state->symbols->get_type(this->type_name);
1784 *name = this->type_name;
1786 if (this->is_array) {
1787 YYLTYPE loc = this->get_location();
1788 type = process_array_type(&loc, type, this->array_size, state);
1796 apply_type_qualifier_to_variable(const struct ast_type_qualifier *qual,
1798 struct _mesa_glsl_parse_state *state,
1801 if (qual->flags.q.invariant) {
1803 _mesa_glsl_error(loc, state,
1804 "variable `%s' may not be redeclared "
1805 "`invariant' after being used",
1812 /* FINISHME: Mark 'in' variables at global scope as read-only. */
1813 if (qual->flags.q.constant || qual->flags.q.attribute
1814 || qual->flags.q.uniform
1815 || (qual->flags.q.varying && (state->target == fragment_shader)))
1818 if (qual->flags.q.centroid)
1821 if (qual->flags.q.attribute && state->target != vertex_shader) {
1822 var->type = glsl_type::error_type;
1823 _mesa_glsl_error(loc, state,
1824 "`attribute' variables may not be declared in the "
1826 _mesa_glsl_shader_target_name(state->target));
1829 /* From page 25 (page 31 of the PDF) of the GLSL 1.10 spec:
1831 * "The varying qualifier can be used only with the data types
1832 * float, vec2, vec3, vec4, mat2, mat3, and mat4, or arrays of
1835 if (qual->flags.q.varying) {
1836 const glsl_type *non_array_type;
1838 if (var->type && var->type->is_array())
1839 non_array_type = var->type->fields.array;
1841 non_array_type = var->type;
1843 if (non_array_type && non_array_type->base_type != GLSL_TYPE_FLOAT) {
1844 var->type = glsl_type::error_type;
1845 _mesa_glsl_error(loc, state,
1846 "varying variables must be of base type float");
1850 /* If there is no qualifier that changes the mode of the variable, leave
1851 * the setting alone.
1853 if (qual->flags.q.in && qual->flags.q.out)
1854 var->mode = ir_var_inout;
1855 else if (qual->flags.q.attribute || qual->flags.q.in
1856 || (qual->flags.q.varying && (state->target == fragment_shader)))
1857 var->mode = ir_var_in;
1858 else if (qual->flags.q.out
1859 || (qual->flags.q.varying && (state->target == vertex_shader)))
1860 var->mode = ir_var_out;
1861 else if (qual->flags.q.uniform)
1862 var->mode = ir_var_uniform;
1864 if (state->all_invariant && (state->current_function == NULL)) {
1865 switch (state->target) {
1867 if (var->mode == ir_var_out)
1868 var->invariant = true;
1870 case geometry_shader:
1871 if ((var->mode == ir_var_in) || (var->mode == ir_var_out))
1872 var->invariant = true;
1874 case fragment_shader:
1875 if (var->mode == ir_var_in)
1876 var->invariant = true;
1881 if (qual->flags.q.flat)
1882 var->interpolation = ir_var_flat;
1883 else if (qual->flags.q.noperspective)
1884 var->interpolation = ir_var_noperspective;
1886 var->interpolation = ir_var_smooth;
1888 var->pixel_center_integer = qual->flags.q.pixel_center_integer;
1889 var->origin_upper_left = qual->flags.q.origin_upper_left;
1890 if ((qual->flags.q.origin_upper_left || qual->flags.q.pixel_center_integer)
1891 && (strcmp(var->name, "gl_FragCoord") != 0)) {
1892 const char *const qual_string = (qual->flags.q.origin_upper_left)
1893 ? "origin_upper_left" : "pixel_center_integer";
1895 _mesa_glsl_error(loc, state,
1896 "layout qualifier `%s' can only be applied to "
1897 "fragment shader input `gl_FragCoord'",
1901 if (qual->flags.q.explicit_location) {
1902 const bool global_scope = (state->current_function == NULL);
1904 const char *string = "";
1906 /* In the vertex shader only shader inputs can be given explicit
1909 * In the fragment shader only shader outputs can be given explicit
1912 switch (state->target) {
1914 if (!global_scope || (var->mode != ir_var_in)) {
1920 case geometry_shader:
1921 _mesa_glsl_error(loc, state,
1922 "geometry shader variables cannot be given "
1923 "explicit locations\n");
1926 case fragment_shader:
1927 if (!global_scope || (var->mode != ir_var_in)) {
1935 _mesa_glsl_error(loc, state,
1936 "only %s shader %s variables can be given an "
1937 "explicit location\n",
1938 _mesa_glsl_shader_target_name(state->target),
1941 var->explicit_location = true;
1943 /* This bit of silliness is needed because invalid explicit locations
1944 * are supposed to be flagged during linking. Small negative values
1945 * biased by VERT_ATTRIB_GENERIC0 or FRAG_RESULT_DATA0 could alias
1946 * built-in values (e.g., -16+VERT_ATTRIB_GENERIC0 = VERT_ATTRIB_POS).
1947 * The linker needs to be able to differentiate these cases. This
1948 * ensures that negative values stay negative.
1950 if (qual->location >= 0) {
1951 var->location = (state->target == vertex_shader)
1952 ? (qual->location + VERT_ATTRIB_GENERIC0)
1953 : (qual->location + FRAG_RESULT_DATA0);
1955 var->location = qual->location;
1960 if (var->type->is_array() && state->language_version != 110) {
1961 var->array_lvalue = true;
1967 ast_declarator_list::hir(exec_list *instructions,
1968 struct _mesa_glsl_parse_state *state)
1971 const struct glsl_type *decl_type;
1972 const char *type_name = NULL;
1973 ir_rvalue *result = NULL;
1974 YYLTYPE loc = this->get_location();
1976 /* From page 46 (page 52 of the PDF) of the GLSL 1.50 spec:
1978 * "To ensure that a particular output variable is invariant, it is
1979 * necessary to use the invariant qualifier. It can either be used to
1980 * qualify a previously declared variable as being invariant
1982 * invariant gl_Position; // make existing gl_Position be invariant"
1984 * In these cases the parser will set the 'invariant' flag in the declarator
1985 * list, and the type will be NULL.
1987 if (this->invariant) {
1988 assert(this->type == NULL);
1990 if (state->current_function != NULL) {
1991 _mesa_glsl_error(& loc, state,
1992 "All uses of `invariant' keyword must be at global "
1996 foreach_list_typed (ast_declaration, decl, link, &this->declarations) {
1997 assert(!decl->is_array);
1998 assert(decl->array_size == NULL);
1999 assert(decl->initializer == NULL);
2001 ir_variable *const earlier =
2002 state->symbols->get_variable(decl->identifier);
2003 if (earlier == NULL) {
2004 _mesa_glsl_error(& loc, state,
2005 "Undeclared variable `%s' cannot be marked "
2006 "invariant\n", decl->identifier);
2007 } else if ((state->target == vertex_shader)
2008 && (earlier->mode != ir_var_out)) {
2009 _mesa_glsl_error(& loc, state,
2010 "`%s' cannot be marked invariant, vertex shader "
2011 "outputs only\n", decl->identifier);
2012 } else if ((state->target == fragment_shader)
2013 && (earlier->mode != ir_var_in)) {
2014 _mesa_glsl_error(& loc, state,
2015 "`%s' cannot be marked invariant, fragment shader "
2016 "inputs only\n", decl->identifier);
2017 } else if (earlier->used) {
2018 _mesa_glsl_error(& loc, state,
2019 "variable `%s' may not be redeclared "
2020 "`invariant' after being used",
2023 earlier->invariant = true;
2027 /* Invariant redeclarations do not have r-values.
2032 assert(this->type != NULL);
2033 assert(!this->invariant);
2035 /* The type specifier may contain a structure definition. Process that
2036 * before any of the variable declarations.
2038 (void) this->type->specifier->hir(instructions, state);
2040 decl_type = this->type->specifier->glsl_type(& type_name, state);
2041 if (this->declarations.is_empty()) {
2042 /* The only valid case where the declaration list can be empty is when
2043 * the declaration is setting the default precision of a built-in type
2044 * (e.g., 'precision highp vec4;').
2047 if (decl_type != NULL) {
2049 _mesa_glsl_error(& loc, state, "incomplete declaration");
2053 foreach_list_typed (ast_declaration, decl, link, &this->declarations) {
2054 const struct glsl_type *var_type;
2057 /* FINISHME: Emit a warning if a variable declaration shadows a
2058 * FINISHME: declaration at a higher scope.
2061 if ((decl_type == NULL) || decl_type->is_void()) {
2062 if (type_name != NULL) {
2063 _mesa_glsl_error(& loc, state,
2064 "invalid type `%s' in declaration of `%s'",
2065 type_name, decl->identifier);
2067 _mesa_glsl_error(& loc, state,
2068 "invalid type in declaration of `%s'",
2074 if (decl->is_array) {
2075 var_type = process_array_type(&loc, decl_type, decl->array_size,
2078 var_type = decl_type;
2081 var = new(ctx) ir_variable(var_type, decl->identifier, ir_var_auto);
2083 /* From page 22 (page 28 of the PDF) of the GLSL 1.10 specification;
2085 * "Global variables can only use the qualifiers const,
2086 * attribute, uni form, or varying. Only one may be
2089 * Local variables can only use the qualifier const."
2091 * This is relaxed in GLSL 1.30. It is also relaxed by any extension
2092 * that adds the 'layout' keyword.
2094 if ((state->language_version < 130)
2095 && !state->ARB_explicit_attrib_location_enable
2096 && !state->ARB_fragment_coord_conventions_enable) {
2097 if (this->type->qualifier.flags.q.out) {
2098 _mesa_glsl_error(& loc, state,
2099 "`out' qualifier in declaration of `%s' "
2100 "only valid for function parameters in %s.",
2101 decl->identifier, state->version_string);
2103 if (this->type->qualifier.flags.q.in) {
2104 _mesa_glsl_error(& loc, state,
2105 "`in' qualifier in declaration of `%s' "
2106 "only valid for function parameters in %s.",
2107 decl->identifier, state->version_string);
2109 /* FINISHME: Test for other invalid qualifiers. */
2112 apply_type_qualifier_to_variable(& this->type->qualifier, var, state,
2115 if (this->type->qualifier.flags.q.invariant) {
2116 if ((state->target == vertex_shader) && !(var->mode == ir_var_out ||
2117 var->mode == ir_var_inout)) {
2118 /* FINISHME: Note that this doesn't work for invariant on
2119 * a function signature outval
2121 _mesa_glsl_error(& loc, state,
2122 "`%s' cannot be marked invariant, vertex shader "
2123 "outputs only\n", var->name);
2124 } else if ((state->target == fragment_shader) &&
2125 !(var->mode == ir_var_in || var->mode == ir_var_inout)) {
2126 /* FINISHME: Note that this doesn't work for invariant on
2127 * a function signature inval
2129 _mesa_glsl_error(& loc, state,
2130 "`%s' cannot be marked invariant, fragment shader "
2131 "inputs only\n", var->name);
2135 if (state->current_function != NULL) {
2136 const char *mode = NULL;
2137 const char *extra = "";
2139 /* There is no need to check for 'inout' here because the parser will
2140 * only allow that in function parameter lists.
2142 if (this->type->qualifier.flags.q.attribute) {
2144 } else if (this->type->qualifier.flags.q.uniform) {
2146 } else if (this->type->qualifier.flags.q.varying) {
2148 } else if (this->type->qualifier.flags.q.in) {
2150 extra = " or in function parameter list";
2151 } else if (this->type->qualifier.flags.q.out) {
2153 extra = " or in function parameter list";
2157 _mesa_glsl_error(& loc, state,
2158 "%s variable `%s' must be declared at "
2160 mode, var->name, extra);
2162 } else if (var->mode == ir_var_in) {
2163 if (state->target == vertex_shader) {
2164 bool error_emitted = false;
2166 /* From page 31 (page 37 of the PDF) of the GLSL 1.50 spec:
2168 * "Vertex shader inputs can only be float, floating-point
2169 * vectors, matrices, signed and unsigned integers and integer
2170 * vectors. Vertex shader inputs can also form arrays of these
2171 * types, but not structures."
2173 * From page 31 (page 27 of the PDF) of the GLSL 1.30 spec:
2175 * "Vertex shader inputs can only be float, floating-point
2176 * vectors, matrices, signed and unsigned integers and integer
2177 * vectors. They cannot be arrays or structures."
2179 * From page 23 (page 29 of the PDF) of the GLSL 1.20 spec:
2181 * "The attribute qualifier can be used only with float,
2182 * floating-point vectors, and matrices. Attribute variables
2183 * cannot be declared as arrays or structures."
2185 const glsl_type *check_type = var->type->is_array()
2186 ? var->type->fields.array : var->type;
2188 switch (check_type->base_type) {
2189 case GLSL_TYPE_FLOAT:
2191 case GLSL_TYPE_UINT:
2193 if (state->language_version > 120)
2197 _mesa_glsl_error(& loc, state,
2198 "vertex shader input / attribute cannot have "
2200 var->type->is_array() ? "array of " : "",
2202 error_emitted = true;
2205 if (!error_emitted && (state->language_version <= 130)
2206 && var->type->is_array()) {
2207 _mesa_glsl_error(& loc, state,
2208 "vertex shader input / attribute cannot have "
2210 error_emitted = true;
2215 /* Integer vertex outputs must be qualified with 'flat'.
2217 * From section 4.3.6 of the GLSL 1.30 spec:
2218 * "If a vertex output is a signed or unsigned integer or integer
2219 * vector, then it must be qualified with the interpolation qualifier
2222 if (state->language_version >= 130
2223 && state->target == vertex_shader
2224 && state->current_function == NULL
2225 && var->type->is_integer()
2226 && var->mode == ir_var_out
2227 && var->interpolation != ir_var_flat) {
2229 _mesa_glsl_error(&loc, state, "If a vertex output is an integer, "
2230 "then it must be qualified with 'flat'");
2234 /* Process the initializer and add its instructions to a temporary
2235 * list. This list will be added to the instruction stream (below) after
2236 * the declaration is added. This is done because in some cases (such as
2237 * redeclarations) the declaration may not actually be added to the
2238 * instruction stream.
2240 exec_list initializer_instructions;
2241 if (decl->initializer != NULL) {
2242 YYLTYPE initializer_loc = decl->initializer->get_location();
2244 /* From page 24 (page 30 of the PDF) of the GLSL 1.10 spec:
2246 * "All uniform variables are read-only and are initialized either
2247 * directly by an application via API commands, or indirectly by
2250 if ((state->language_version <= 110)
2251 && (var->mode == ir_var_uniform)) {
2252 _mesa_glsl_error(& initializer_loc, state,
2253 "cannot initialize uniforms in GLSL 1.10");
2256 if (var->type->is_sampler()) {
2257 _mesa_glsl_error(& initializer_loc, state,
2258 "cannot initialize samplers");
2261 if ((var->mode == ir_var_in) && (state->current_function == NULL)) {
2262 _mesa_glsl_error(& initializer_loc, state,
2263 "cannot initialize %s shader input / %s",
2264 _mesa_glsl_shader_target_name(state->target),
2265 (state->target == vertex_shader)
2266 ? "attribute" : "varying");
2269 ir_dereference *const lhs = new(ctx) ir_dereference_variable(var);
2270 ir_rvalue *rhs = decl->initializer->hir(&initializer_instructions,
2273 /* Calculate the constant value if this is a const or uniform
2276 if (this->type->qualifier.flags.q.constant
2277 || this->type->qualifier.flags.q.uniform) {
2278 ir_rvalue *new_rhs = validate_assignment(state, var->type, rhs);
2279 if (new_rhs != NULL) {
2282 ir_constant *constant_value = rhs->constant_expression_value();
2283 if (!constant_value) {
2284 _mesa_glsl_error(& initializer_loc, state,
2285 "initializer of %s variable `%s' must be a "
2286 "constant expression",
2287 (this->type->qualifier.flags.q.constant)
2288 ? "const" : "uniform",
2290 if (var->type->is_numeric()) {
2291 /* Reduce cascading errors. */
2292 var->constant_value = ir_constant::zero(ctx, var->type);
2295 rhs = constant_value;
2296 var->constant_value = constant_value;
2299 _mesa_glsl_error(&initializer_loc, state,
2300 "initializer of type %s cannot be assigned to "
2301 "variable of type %s",
2302 rhs->type->name, var->type->name);
2303 if (var->type->is_numeric()) {
2304 /* Reduce cascading errors. */
2305 var->constant_value = ir_constant::zero(ctx, var->type);
2310 if (rhs && !rhs->type->is_error()) {
2311 bool temp = var->read_only;
2312 if (this->type->qualifier.flags.q.constant)
2313 var->read_only = false;
2315 /* Never emit code to initialize a uniform.
2317 const glsl_type *initializer_type;
2318 if (!this->type->qualifier.flags.q.uniform) {
2319 result = do_assignment(&initializer_instructions, state,
2321 this->get_location());
2322 initializer_type = result->type;
2324 initializer_type = rhs->type;
2326 /* If the declared variable is an unsized array, it must inherrit
2327 * its full type from the initializer. A declaration such as
2329 * uniform float a[] = float[](1.0, 2.0, 3.0, 3.0);
2333 * uniform float a[4] = float[](1.0, 2.0, 3.0, 3.0);
2335 * The assignment generated in the if-statement (below) will also
2336 * automatically handle this case for non-uniforms.
2338 * If the declared variable is not an array, the types must
2339 * already match exactly. As a result, the type assignment
2340 * here can be done unconditionally. For non-uniforms the call
2341 * to do_assignment can change the type of the initializer (via
2342 * the implicit conversion rules). For uniforms the initializer
2343 * must be a constant expression, and the type of that expression
2344 * was validated above.
2346 var->type = initializer_type;
2348 var->read_only = temp;
2352 /* From page 23 (page 29 of the PDF) of the GLSL 1.10 spec:
2354 * "It is an error to write to a const variable outside of
2355 * its declaration, so they must be initialized when
2358 if (this->type->qualifier.flags.q.constant && decl->initializer == NULL) {
2359 _mesa_glsl_error(& loc, state,
2360 "const declaration of `%s' must be initialized");
2363 /* Check if this declaration is actually a re-declaration, either to
2364 * resize an array or add qualifiers to an existing variable.
2366 * This is allowed for variables in the current scope, or when at
2367 * global scope (for built-ins in the implicit outer scope).
2369 ir_variable *earlier = state->symbols->get_variable(decl->identifier);
2370 if (earlier != NULL && (state->current_function == NULL ||
2371 state->symbols->name_declared_this_scope(decl->identifier))) {
2373 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec,
2375 * "It is legal to declare an array without a size and then
2376 * later re-declare the same name as an array of the same
2377 * type and specify a size."
2379 if ((earlier->type->array_size() == 0)
2380 && var->type->is_array()
2381 && (var->type->element_type() == earlier->type->element_type())) {
2382 /* FINISHME: This doesn't match the qualifiers on the two
2383 * FINISHME: declarations. It's not 100% clear whether this is
2384 * FINISHME: required or not.
2387 /* From page 54 (page 60 of the PDF) of the GLSL 1.20 spec:
2389 * "The size [of gl_TexCoord] can be at most
2390 * gl_MaxTextureCoords."
2392 const unsigned size = unsigned(var->type->array_size());
2393 if ((strcmp("gl_TexCoord", var->name) == 0)
2394 && (size > state->Const.MaxTextureCoords)) {
2395 YYLTYPE loc = this->get_location();
2397 _mesa_glsl_error(& loc, state, "`gl_TexCoord' array size cannot "
2398 "be larger than gl_MaxTextureCoords (%u)\n",
2399 state->Const.MaxTextureCoords);
2400 } else if ((size > 0) && (size <= earlier->max_array_access)) {
2401 YYLTYPE loc = this->get_location();
2403 _mesa_glsl_error(& loc, state, "array size must be > %u due to "
2405 earlier->max_array_access);
2408 earlier->type = var->type;
2411 } else if (state->ARB_fragment_coord_conventions_enable
2412 && strcmp(var->name, "gl_FragCoord") == 0
2413 && earlier->type == var->type
2414 && earlier->mode == var->mode) {
2415 /* Allow redeclaration of gl_FragCoord for ARB_fcc layout
2418 earlier->origin_upper_left = var->origin_upper_left;
2419 earlier->pixel_center_integer = var->pixel_center_integer;
2421 /* According to section 4.3.7 of the GLSL 1.30 spec,
2422 * the following built-in varaibles can be redeclared with an
2423 * interpolation qualifier:
2426 * * gl_FrontSecondaryColor
2427 * * gl_BackSecondaryColor
2429 * * gl_SecondaryColor
2431 } else if (state->language_version >= 130
2432 && (strcmp(var->name, "gl_FrontColor") == 0
2433 || strcmp(var->name, "gl_BackColor") == 0
2434 || strcmp(var->name, "gl_FrontSecondaryColor") == 0
2435 || strcmp(var->name, "gl_BackSecondaryColor") == 0
2436 || strcmp(var->name, "gl_Color") == 0
2437 || strcmp(var->name, "gl_SecondaryColor") == 0)
2438 && earlier->type == var->type
2439 && earlier->mode == var->mode) {
2440 earlier->interpolation = var->interpolation;
2442 YYLTYPE loc = this->get_location();
2443 _mesa_glsl_error(&loc, state, "`%s' redeclared", decl->identifier);
2449 /* By now, we know it's a new variable declaration (we didn't hit the
2450 * above "continue").
2452 * From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
2454 * "Identifiers starting with "gl_" are reserved for use by
2455 * OpenGL, and may not be declared in a shader as either a
2456 * variable or a function."
2458 if (strncmp(decl->identifier, "gl_", 3) == 0)
2459 _mesa_glsl_error(& loc, state,
2460 "identifier `%s' uses reserved `gl_' prefix",
2463 /* Add the variable to the symbol table. Note that the initializer's
2464 * IR was already processed earlier (though it hasn't been emitted yet),
2465 * without the variable in scope.
2467 * This differs from most C-like languages, but it follows the GLSL
2468 * specification. From page 28 (page 34 of the PDF) of the GLSL 1.50
2471 * "Within a declaration, the scope of a name starts immediately
2472 * after the initializer if present or immediately after the name
2473 * being declared if not."
2475 if (!state->symbols->add_variable(var)) {
2476 YYLTYPE loc = this->get_location();
2477 _mesa_glsl_error(&loc, state, "name `%s' already taken in the "
2478 "current scope", decl->identifier);
2482 /* Push the variable declaration to the top. It means that all
2483 * the variable declarations will appear in a funny
2484 * last-to-first order, but otherwise we run into trouble if a
2485 * function is prototyped, a global var is decled, then the
2486 * function is defined with usage of the global var. See
2487 * glslparsertest's CorrectModule.frag.
2489 instructions->push_head(var);
2490 instructions->append_list(&initializer_instructions);
2494 /* Generally, variable declarations do not have r-values. However,
2495 * one is used for the declaration in
2497 * while (bool b = some_condition()) {
2501 * so we return the rvalue from the last seen declaration here.
2508 ast_parameter_declarator::hir(exec_list *instructions,
2509 struct _mesa_glsl_parse_state *state)
2512 const struct glsl_type *type;
2513 const char *name = NULL;
2514 YYLTYPE loc = this->get_location();
2516 type = this->type->specifier->glsl_type(& name, state);
2520 _mesa_glsl_error(& loc, state,
2521 "invalid type `%s' in declaration of `%s'",
2522 name, this->identifier);
2524 _mesa_glsl_error(& loc, state,
2525 "invalid type in declaration of `%s'",
2529 type = glsl_type::error_type;
2532 /* From page 62 (page 68 of the PDF) of the GLSL 1.50 spec:
2534 * "Functions that accept no input arguments need not use void in the
2535 * argument list because prototypes (or definitions) are required and
2536 * therefore there is no ambiguity when an empty argument list "( )" is
2537 * declared. The idiom "(void)" as a parameter list is provided for
2540 * Placing this check here prevents a void parameter being set up
2541 * for a function, which avoids tripping up checks for main taking
2542 * parameters and lookups of an unnamed symbol.
2544 if (type->is_void()) {
2545 if (this->identifier != NULL)
2546 _mesa_glsl_error(& loc, state,
2547 "named parameter cannot have type `void'");
2553 if (formal_parameter && (this->identifier == NULL)) {
2554 _mesa_glsl_error(& loc, state, "formal parameter lacks a name");
2558 /* This only handles "vec4 foo[..]". The earlier specifier->glsl_type(...)
2559 * call already handled the "vec4[..] foo" case.
2561 if (this->is_array) {
2562 type = process_array_type(&loc, type, this->array_size, state);
2565 if (type->array_size() == 0) {
2566 _mesa_glsl_error(&loc, state, "arrays passed as parameters must have "
2567 "a declared size.");
2568 type = glsl_type::error_type;
2572 ir_variable *var = new(ctx) ir_variable(type, this->identifier, ir_var_in);
2574 /* Apply any specified qualifiers to the parameter declaration. Note that
2575 * for function parameters the default mode is 'in'.
2577 apply_type_qualifier_to_variable(& this->type->qualifier, var, state, & loc);
2579 instructions->push_tail(var);
2581 /* Parameter declarations do not have r-values.
2588 ast_parameter_declarator::parameters_to_hir(exec_list *ast_parameters,
2590 exec_list *ir_parameters,
2591 _mesa_glsl_parse_state *state)
2593 ast_parameter_declarator *void_param = NULL;
2596 foreach_list_typed (ast_parameter_declarator, param, link, ast_parameters) {
2597 param->formal_parameter = formal;
2598 param->hir(ir_parameters, state);
2606 if ((void_param != NULL) && (count > 1)) {
2607 YYLTYPE loc = void_param->get_location();
2609 _mesa_glsl_error(& loc, state,
2610 "`void' parameter must be only parameter");
2616 emit_function(_mesa_glsl_parse_state *state, exec_list *instructions,
2619 /* Emit the new function header */
2620 if (state->current_function == NULL) {
2621 instructions->push_tail(f);
2623 /* IR invariants disallow function declarations or definitions nested
2624 * within other function definitions. Insert the new ir_function
2625 * block in the instruction sequence before the ir_function block
2626 * containing the current ir_function_signature.
2628 ir_function *const curr =
2629 const_cast<ir_function *>(state->current_function->function());
2631 curr->insert_before(f);
2637 ast_function::hir(exec_list *instructions,
2638 struct _mesa_glsl_parse_state *state)
2641 ir_function *f = NULL;
2642 ir_function_signature *sig = NULL;
2643 exec_list hir_parameters;
2645 const char *const name = identifier;
2647 /* From page 21 (page 27 of the PDF) of the GLSL 1.20 spec,
2649 * "Function declarations (prototypes) cannot occur inside of functions;
2650 * they must be at global scope, or for the built-in functions, outside
2651 * the global scope."
2653 * From page 27 (page 33 of the PDF) of the GLSL ES 1.00.16 spec,
2655 * "User defined functions may only be defined within the global scope."
2657 * Note that this language does not appear in GLSL 1.10.
2659 if ((state->current_function != NULL) && (state->language_version != 110)) {
2660 YYLTYPE loc = this->get_location();
2661 _mesa_glsl_error(&loc, state,
2662 "declaration of function `%s' not allowed within "
2663 "function body", name);
2666 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
2668 * "Identifiers starting with "gl_" are reserved for use by
2669 * OpenGL, and may not be declared in a shader as either a
2670 * variable or a function."
2672 if (strncmp(name, "gl_", 3) == 0) {
2673 YYLTYPE loc = this->get_location();
2674 _mesa_glsl_error(&loc, state,
2675 "identifier `%s' uses reserved `gl_' prefix", name);
2678 /* Convert the list of function parameters to HIR now so that they can be
2679 * used below to compare this function's signature with previously seen
2680 * signatures for functions with the same name.
2682 ast_parameter_declarator::parameters_to_hir(& this->parameters,
2684 & hir_parameters, state);
2686 const char *return_type_name;
2687 const glsl_type *return_type =
2688 this->return_type->specifier->glsl_type(& return_type_name, state);
2691 YYLTYPE loc = this->get_location();
2692 _mesa_glsl_error(&loc, state,
2693 "function `%s' has undeclared return type `%s'",
2694 name, return_type_name);
2695 return_type = glsl_type::error_type;
2698 /* From page 56 (page 62 of the PDF) of the GLSL 1.30 spec:
2699 * "No qualifier is allowed on the return type of a function."
2701 if (this->return_type->has_qualifiers()) {
2702 YYLTYPE loc = this->get_location();
2703 _mesa_glsl_error(& loc, state,
2704 "function `%s' return type has qualifiers", name);
2707 /* Verify that this function's signature either doesn't match a previously
2708 * seen signature for a function with the same name, or, if a match is found,
2709 * that the previously seen signature does not have an associated definition.
2711 f = state->symbols->get_function(name);
2712 if (f != NULL && (state->es_shader || f->has_user_signature())) {
2713 sig = f->exact_matching_signature(&hir_parameters);
2715 const char *badvar = sig->qualifiers_match(&hir_parameters);
2716 if (badvar != NULL) {
2717 YYLTYPE loc = this->get_location();
2719 _mesa_glsl_error(&loc, state, "function `%s' parameter `%s' "
2720 "qualifiers don't match prototype", name, badvar);
2723 if (sig->return_type != return_type) {
2724 YYLTYPE loc = this->get_location();
2726 _mesa_glsl_error(&loc, state, "function `%s' return type doesn't "
2727 "match prototype", name);
2730 if (is_definition && sig->is_defined) {
2731 YYLTYPE loc = this->get_location();
2733 _mesa_glsl_error(& loc, state, "function `%s' redefined", name);
2737 f = new(ctx) ir_function(name);
2738 if (!state->symbols->add_function(f)) {
2739 /* This function name shadows a non-function use of the same name. */
2740 YYLTYPE loc = this->get_location();
2742 _mesa_glsl_error(&loc, state, "function name `%s' conflicts with "
2743 "non-function", name);
2747 emit_function(state, instructions, f);
2750 /* Verify the return type of main() */
2751 if (strcmp(name, "main") == 0) {
2752 if (! return_type->is_void()) {
2753 YYLTYPE loc = this->get_location();
2755 _mesa_glsl_error(& loc, state, "main() must return void");
2758 if (!hir_parameters.is_empty()) {
2759 YYLTYPE loc = this->get_location();
2761 _mesa_glsl_error(& loc, state, "main() must not take any parameters");
2765 /* Finish storing the information about this new function in its signature.
2768 sig = new(ctx) ir_function_signature(return_type);
2769 f->add_signature(sig);
2772 sig->replace_parameters(&hir_parameters);
2775 /* Function declarations (prototypes) do not have r-values.
2782 ast_function_definition::hir(exec_list *instructions,
2783 struct _mesa_glsl_parse_state *state)
2785 prototype->is_definition = true;
2786 prototype->hir(instructions, state);
2788 ir_function_signature *signature = prototype->signature;
2789 if (signature == NULL)
2792 assert(state->current_function == NULL);
2793 state->current_function = signature;
2794 state->found_return = false;
2796 /* Duplicate parameters declared in the prototype as concrete variables.
2797 * Add these to the symbol table.
2799 state->symbols->push_scope();
2800 foreach_iter(exec_list_iterator, iter, signature->parameters) {
2801 ir_variable *const var = ((ir_instruction *) iter.get())->as_variable();
2803 assert(var != NULL);
2805 /* The only way a parameter would "exist" is if two parameters have
2808 if (state->symbols->name_declared_this_scope(var->name)) {
2809 YYLTYPE loc = this->get_location();
2811 _mesa_glsl_error(& loc, state, "parameter `%s' redeclared", var->name);
2813 state->symbols->add_variable(var);
2817 /* Convert the body of the function to HIR. */
2818 this->body->hir(&signature->body, state);
2819 signature->is_defined = true;
2821 state->symbols->pop_scope();
2823 assert(state->current_function == signature);
2824 state->current_function = NULL;
2826 if (!signature->return_type->is_void() && !state->found_return) {
2827 YYLTYPE loc = this->get_location();
2828 _mesa_glsl_error(& loc, state, "function `%s' has non-void return type "
2829 "%s, but no return statement",
2830 signature->function_name(),
2831 signature->return_type->name);
2834 /* Function definitions do not have r-values.
2841 ast_jump_statement::hir(exec_list *instructions,
2842 struct _mesa_glsl_parse_state *state)
2849 assert(state->current_function);
2851 if (opt_return_value) {
2852 if (state->current_function->return_type->base_type ==
2854 YYLTYPE loc = this->get_location();
2856 _mesa_glsl_error(& loc, state,
2857 "`return` with a value, in function `%s' "
2859 state->current_function->function_name());
2862 ir_rvalue *const ret = opt_return_value->hir(instructions, state);
2863 assert(ret != NULL);
2865 /* Implicit conversions are not allowed for return values. */
2866 if (state->current_function->return_type != ret->type) {
2867 YYLTYPE loc = this->get_location();
2869 _mesa_glsl_error(& loc, state,
2870 "`return' with wrong type %s, in function `%s' "
2873 state->current_function->function_name(),
2874 state->current_function->return_type->name);
2877 inst = new(ctx) ir_return(ret);
2879 if (state->current_function->return_type->base_type !=
2881 YYLTYPE loc = this->get_location();
2883 _mesa_glsl_error(& loc, state,
2884 "`return' with no value, in function %s returning "
2886 state->current_function->function_name());
2888 inst = new(ctx) ir_return;
2891 state->found_return = true;
2892 instructions->push_tail(inst);
2897 if (state->target != fragment_shader) {
2898 YYLTYPE loc = this->get_location();
2900 _mesa_glsl_error(& loc, state,
2901 "`discard' may only appear in a fragment shader");
2903 instructions->push_tail(new(ctx) ir_discard);
2908 /* FINISHME: Handle switch-statements. They cannot contain 'continue',
2909 * FINISHME: and they use a different IR instruction for 'break'.
2911 /* FINISHME: Correctly handle the nesting. If a switch-statement is
2912 * FINISHME: inside a loop, a 'continue' is valid and will bind to the
2915 if (state->loop_or_switch_nesting == NULL) {
2916 YYLTYPE loc = this->get_location();
2918 _mesa_glsl_error(& loc, state,
2919 "`%s' may only appear in a loop",
2920 (mode == ast_break) ? "break" : "continue");
2922 ir_loop *const loop = state->loop_or_switch_nesting->as_loop();
2924 /* Inline the for loop expression again, since we don't know
2925 * where near the end of the loop body the normal copy of it
2926 * is going to be placed.
2928 if (mode == ast_continue &&
2929 state->loop_or_switch_nesting_ast->rest_expression) {
2930 state->loop_or_switch_nesting_ast->rest_expression->hir(instructions,
2935 ir_loop_jump *const jump =
2936 new(ctx) ir_loop_jump((mode == ast_break)
2937 ? ir_loop_jump::jump_break
2938 : ir_loop_jump::jump_continue);
2939 instructions->push_tail(jump);
2946 /* Jump instructions do not have r-values.
2953 ast_selection_statement::hir(exec_list *instructions,
2954 struct _mesa_glsl_parse_state *state)
2958 ir_rvalue *const condition = this->condition->hir(instructions, state);
2960 /* From page 66 (page 72 of the PDF) of the GLSL 1.50 spec:
2962 * "Any expression whose type evaluates to a Boolean can be used as the
2963 * conditional expression bool-expression. Vector types are not accepted
2964 * as the expression to if."
2966 * The checks are separated so that higher quality diagnostics can be
2967 * generated for cases where both rules are violated.
2969 if (!condition->type->is_boolean() || !condition->type->is_scalar()) {
2970 YYLTYPE loc = this->condition->get_location();
2972 _mesa_glsl_error(& loc, state, "if-statement condition must be scalar "
2976 ir_if *const stmt = new(ctx) ir_if(condition);
2978 if (then_statement != NULL) {
2979 state->symbols->push_scope();
2980 then_statement->hir(& stmt->then_instructions, state);
2981 state->symbols->pop_scope();
2984 if (else_statement != NULL) {
2985 state->symbols->push_scope();
2986 else_statement->hir(& stmt->else_instructions, state);
2987 state->symbols->pop_scope();
2990 instructions->push_tail(stmt);
2992 /* if-statements do not have r-values.
2999 ast_iteration_statement::condition_to_hir(ir_loop *stmt,
3000 struct _mesa_glsl_parse_state *state)
3004 if (condition != NULL) {
3005 ir_rvalue *const cond =
3006 condition->hir(& stmt->body_instructions, state);
3009 || !cond->type->is_boolean() || !cond->type->is_scalar()) {
3010 YYLTYPE loc = condition->get_location();
3012 _mesa_glsl_error(& loc, state,
3013 "loop condition must be scalar boolean");
3015 /* As the first code in the loop body, generate a block that looks
3016 * like 'if (!condition) break;' as the loop termination condition.
3018 ir_rvalue *const not_cond =
3019 new(ctx) ir_expression(ir_unop_logic_not, glsl_type::bool_type, cond,
3022 ir_if *const if_stmt = new(ctx) ir_if(not_cond);
3024 ir_jump *const break_stmt =
3025 new(ctx) ir_loop_jump(ir_loop_jump::jump_break);
3027 if_stmt->then_instructions.push_tail(break_stmt);
3028 stmt->body_instructions.push_tail(if_stmt);
3035 ast_iteration_statement::hir(exec_list *instructions,
3036 struct _mesa_glsl_parse_state *state)
3040 /* For-loops and while-loops start a new scope, but do-while loops do not.
3042 if (mode != ast_do_while)
3043 state->symbols->push_scope();
3045 if (init_statement != NULL)
3046 init_statement->hir(instructions, state);
3048 ir_loop *const stmt = new(ctx) ir_loop();
3049 instructions->push_tail(stmt);
3051 /* Track the current loop and / or switch-statement nesting.
3053 ir_instruction *const nesting = state->loop_or_switch_nesting;
3054 ast_iteration_statement *nesting_ast = state->loop_or_switch_nesting_ast;
3056 state->loop_or_switch_nesting = stmt;
3057 state->loop_or_switch_nesting_ast = this;
3059 if (mode != ast_do_while)
3060 condition_to_hir(stmt, state);
3063 body->hir(& stmt->body_instructions, state);
3065 if (rest_expression != NULL)
3066 rest_expression->hir(& stmt->body_instructions, state);
3068 if (mode == ast_do_while)
3069 condition_to_hir(stmt, state);
3071 if (mode != ast_do_while)
3072 state->symbols->pop_scope();
3074 /* Restore previous nesting before returning.
3076 state->loop_or_switch_nesting = nesting;
3077 state->loop_or_switch_nesting_ast = nesting_ast;
3079 /* Loops do not have r-values.
3086 ast_type_specifier::hir(exec_list *instructions,
3087 struct _mesa_glsl_parse_state *state)
3089 if (this->structure != NULL)
3090 return this->structure->hir(instructions, state);
3097 ast_struct_specifier::hir(exec_list *instructions,
3098 struct _mesa_glsl_parse_state *state)
3100 unsigned decl_count = 0;
3102 /* Make an initial pass over the list of structure fields to determine how
3103 * many there are. Each element in this list is an ast_declarator_list.
3104 * This means that we actually need to count the number of elements in the
3105 * 'declarations' list in each of the elements.
3107 foreach_list_typed (ast_declarator_list, decl_list, link,
3108 &this->declarations) {
3109 foreach_list_const (decl_ptr, & decl_list->declarations) {
3114 /* Allocate storage for the structure fields and process the field
3115 * declarations. As the declarations are processed, try to also convert
3116 * the types to HIR. This ensures that structure definitions embedded in
3117 * other structure definitions are processed.
3119 glsl_struct_field *const fields = talloc_array(state, glsl_struct_field,
3123 foreach_list_typed (ast_declarator_list, decl_list, link,
3124 &this->declarations) {
3125 const char *type_name;
3127 decl_list->type->specifier->hir(instructions, state);
3129 /* Section 10.9 of the GLSL ES 1.00 specification states that
3130 * embedded structure definitions have been removed from the language.
3132 if (state->es_shader && decl_list->type->specifier->structure != NULL) {
3133 YYLTYPE loc = this->get_location();
3134 _mesa_glsl_error(&loc, state, "Embedded structure definitions are "
3135 "not allowed in GLSL ES 1.00.");
3138 const glsl_type *decl_type =
3139 decl_list->type->specifier->glsl_type(& type_name, state);
3141 foreach_list_typed (ast_declaration, decl, link,
3142 &decl_list->declarations) {
3143 const struct glsl_type *field_type = decl_type;
3144 if (decl->is_array) {
3145 YYLTYPE loc = decl->get_location();
3146 field_type = process_array_type(&loc, decl_type, decl->array_size,
3149 fields[i].type = (field_type != NULL)
3150 ? field_type : glsl_type::error_type;
3151 fields[i].name = decl->identifier;
3156 assert(i == decl_count);
3158 const glsl_type *t =
3159 glsl_type::get_record_instance(fields, decl_count, this->name);
3161 YYLTYPE loc = this->get_location();
3162 if (!state->symbols->add_type(name, t)) {
3163 _mesa_glsl_error(& loc, state, "struct `%s' previously defined", name);
3166 const glsl_type **s = (const glsl_type **)
3167 realloc(state->user_structures,
3168 sizeof(state->user_structures[0]) *
3169 (state->num_user_structures + 1));
3171 s[state->num_user_structures] = t;
3172 state->user_structures = s;
3173 state->num_user_structures++;
3177 /* Structure type definitions do not have r-values.