1 /****************************************************************************
3 * GNAT COMPILER COMPONENTS *
7 * C Implementation File *
9 * Copyright (C) 1992-2009, Free Software Foundation, Inc. *
11 * GNAT is free software; you can redistribute it and/or modify it under *
12 * terms of the GNU General Public License as published by the Free Soft- *
13 * ware Foundation; either version 3, or (at your option) any later ver- *
14 * sion. GNAT is distributed in the hope that it will be useful, but WITH- *
15 * OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY *
16 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License *
17 * for more details. You should have received a copy of the GNU General *
18 * Public License along with GCC; see the file COPYING3. If not see *
19 * <http://www.gnu.org/licenses/>. *
21 * GNAT was originally developed by the GNAT team at New York University. *
22 * Extensive contributions were provided by Ada Core Technologies Inc. *
24 ****************************************************************************/
28 #include "coretypes.h"
49 static tree find_common_type (tree, tree);
50 static bool contains_save_expr_p (tree);
51 static tree contains_null_expr (tree);
52 static tree compare_arrays (tree, tree, tree);
53 static tree nonbinary_modular_operation (enum tree_code, tree, tree, tree);
54 static tree build_simple_component_ref (tree, tree, tree, bool);
56 /* Prepare expr to be an argument of a TRUTH_NOT_EXPR or other logical
59 This preparation consists of taking the ordinary representation of
60 an expression expr and producing a valid tree boolean expression
61 describing whether expr is nonzero. We could simply always do
63 build_binary_op (NE_EXPR, expr, integer_zero_node, 1),
65 but we optimize comparisons, &&, ||, and !.
67 The resulting type should always be the same as the input type.
68 This function is simpler than the corresponding C version since
69 the only possible operands will be things of Boolean type. */
72 gnat_truthvalue_conversion (tree expr)
74 tree type = TREE_TYPE (expr);
76 switch (TREE_CODE (expr))
78 case EQ_EXPR: case NE_EXPR: case LE_EXPR: case GE_EXPR:
79 case LT_EXPR: case GT_EXPR:
80 case TRUTH_ANDIF_EXPR:
89 return (integer_zerop (expr)
90 ? build_int_cst (type, 0)
91 : build_int_cst (type, 1));
94 return (real_zerop (expr)
95 ? fold_convert (type, integer_zero_node)
96 : fold_convert (type, integer_one_node));
99 /* Distribute the conversion into the arms of a COND_EXPR. */
101 tree arg1 = gnat_truthvalue_conversion (TREE_OPERAND (expr, 1));
102 tree arg2 = gnat_truthvalue_conversion (TREE_OPERAND (expr, 2));
103 return fold_build3 (COND_EXPR, type, TREE_OPERAND (expr, 0),
108 return build_binary_op (NE_EXPR, type, expr,
109 fold_convert (type, integer_zero_node));
113 /* Return the base type of TYPE. */
116 get_base_type (tree type)
118 if (TREE_CODE (type) == RECORD_TYPE
119 && TYPE_JUSTIFIED_MODULAR_P (type))
120 type = TREE_TYPE (TYPE_FIELDS (type));
122 while (TREE_TYPE (type)
123 && (TREE_CODE (type) == INTEGER_TYPE
124 || TREE_CODE (type) == REAL_TYPE))
125 type = TREE_TYPE (type);
130 /* EXP is a GCC tree representing an address. See if we can find how
131 strictly the object at that address is aligned. Return that alignment
132 in bits. If we don't know anything about the alignment, return 0. */
135 known_alignment (tree exp)
137 unsigned int this_alignment;
138 unsigned int lhs, rhs;
140 switch (TREE_CODE (exp))
143 case VIEW_CONVERT_EXPR:
144 case NON_LVALUE_EXPR:
145 /* Conversions between pointers and integers don't change the alignment
146 of the underlying object. */
147 this_alignment = known_alignment (TREE_OPERAND (exp, 0));
151 /* The value of a COMPOUND_EXPR is that of it's second operand. */
152 this_alignment = known_alignment (TREE_OPERAND (exp, 1));
157 /* If two address are added, the alignment of the result is the
158 minimum of the two alignments. */
159 lhs = known_alignment (TREE_OPERAND (exp, 0));
160 rhs = known_alignment (TREE_OPERAND (exp, 1));
161 this_alignment = MIN (lhs, rhs);
164 case POINTER_PLUS_EXPR:
165 lhs = known_alignment (TREE_OPERAND (exp, 0));
166 rhs = known_alignment (TREE_OPERAND (exp, 1));
167 /* If we don't know the alignment of the offset, we assume that
170 this_alignment = lhs;
172 this_alignment = MIN (lhs, rhs);
176 /* If there is a choice between two values, use the smallest one. */
177 lhs = known_alignment (TREE_OPERAND (exp, 1));
178 rhs = known_alignment (TREE_OPERAND (exp, 2));
179 this_alignment = MIN (lhs, rhs);
184 unsigned HOST_WIDE_INT c = TREE_INT_CST_LOW (exp);
185 /* The first part of this represents the lowest bit in the constant,
186 but it is originally in bytes, not bits. */
187 this_alignment = MIN (BITS_PER_UNIT * (c & -c), BIGGEST_ALIGNMENT);
192 /* If we know the alignment of just one side, use it. Otherwise,
193 use the product of the alignments. */
194 lhs = known_alignment (TREE_OPERAND (exp, 0));
195 rhs = known_alignment (TREE_OPERAND (exp, 1));
198 this_alignment = rhs;
200 this_alignment = lhs;
202 this_alignment = MIN (lhs * rhs, BIGGEST_ALIGNMENT);
206 /* A bit-and expression is as aligned as the maximum alignment of the
207 operands. We typically get here for a complex lhs and a constant
208 negative power of two on the rhs to force an explicit alignment, so
209 don't bother looking at the lhs. */
210 this_alignment = known_alignment (TREE_OPERAND (exp, 1));
214 this_alignment = expr_align (TREE_OPERAND (exp, 0));
218 /* For other pointer expressions, we assume that the pointed-to object
219 is at least as aligned as the pointed-to type. Beware that we can
220 have a dummy type here (e.g. a Taft Amendment type), for which the
221 alignment is meaningless and should be ignored. */
222 if (POINTER_TYPE_P (TREE_TYPE (exp))
223 && !TYPE_IS_DUMMY_P (TREE_TYPE (TREE_TYPE (exp))))
224 this_alignment = TYPE_ALIGN (TREE_TYPE (TREE_TYPE (exp)));
230 return this_alignment;
233 /* We have a comparison or assignment operation on two types, T1 and T2, which
234 are either both array types or both record types. T1 is assumed to be for
235 the left hand side operand, and T2 for the right hand side. Return the
236 type that both operands should be converted to for the operation, if any.
237 Otherwise return zero. */
240 find_common_type (tree t1, tree t2)
242 /* ??? As of today, various constructs lead here with types of different
243 sizes even when both constants (e.g. tagged types, packable vs regular
244 component types, padded vs unpadded types, ...). While some of these
245 would better be handled upstream (types should be made consistent before
246 calling into build_binary_op), some others are really expected and we
247 have to be careful. */
249 /* We must prevent writing more than what the target may hold if this is for
250 an assignment and the case of tagged types is handled in build_binary_op
251 so use the lhs type if it is known to be smaller, or of constant size and
252 the rhs type is not, whatever the modes. We also force t1 in case of
253 constant size equality to minimize occurrences of view conversions on the
254 lhs of assignments. */
255 if (TREE_CONSTANT (TYPE_SIZE (t1))
256 && (!TREE_CONSTANT (TYPE_SIZE (t2))
257 || !tree_int_cst_lt (TYPE_SIZE (t2), TYPE_SIZE (t1))))
260 /* Otherwise, if the lhs type is non-BLKmode, use it. Note that we know
261 that we will not have any alignment problems since, if we did, the
262 non-BLKmode type could not have been used. */
263 if (TYPE_MODE (t1) != BLKmode)
266 /* If the rhs type is of constant size, use it whatever the modes. At
267 this point it is known to be smaller, or of constant size and the
269 if (TREE_CONSTANT (TYPE_SIZE (t2)))
272 /* Otherwise, if the rhs type is non-BLKmode, use it. */
273 if (TYPE_MODE (t2) != BLKmode)
276 /* In this case, both types have variable size and BLKmode. It's
277 probably best to leave the "type mismatch" because changing it
278 could cause a bad self-referential reference. */
282 /* See if EXP contains a SAVE_EXPR in a position where we would
285 ??? This is a real kludge, but is probably the best approach short
286 of some very general solution. */
289 contains_save_expr_p (tree exp)
291 switch (TREE_CODE (exp))
296 case ADDR_EXPR: case INDIRECT_REF:
298 CASE_CONVERT: case VIEW_CONVERT_EXPR:
299 return contains_save_expr_p (TREE_OPERAND (exp, 0));
304 unsigned HOST_WIDE_INT ix;
306 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp), ix, value)
307 if (contains_save_expr_p (value))
317 /* See if EXP contains a NULL_EXPR in an expression we use for sizes. Return
318 it if so. This is used to detect types whose sizes involve computations
319 that are known to raise Constraint_Error. */
322 contains_null_expr (tree exp)
326 if (TREE_CODE (exp) == NULL_EXPR)
329 switch (TREE_CODE_CLASS (TREE_CODE (exp)))
332 return contains_null_expr (TREE_OPERAND (exp, 0));
336 tem = contains_null_expr (TREE_OPERAND (exp, 0));
340 return contains_null_expr (TREE_OPERAND (exp, 1));
343 switch (TREE_CODE (exp))
346 return contains_null_expr (TREE_OPERAND (exp, 0));
349 tem = contains_null_expr (TREE_OPERAND (exp, 0));
353 tem = contains_null_expr (TREE_OPERAND (exp, 1));
357 return contains_null_expr (TREE_OPERAND (exp, 2));
368 /* Return an expression tree representing an equality comparison of
369 A1 and A2, two objects of ARRAY_TYPE. The returned expression should
370 be of type RESULT_TYPE
372 Two arrays are equal in one of two ways: (1) if both have zero length
373 in some dimension (not necessarily the same dimension) or (2) if the
374 lengths in each dimension are equal and the data is equal. We perform the
375 length tests in as efficient a manner as possible. */
378 compare_arrays (tree result_type, tree a1, tree a2)
380 tree t1 = TREE_TYPE (a1);
381 tree t2 = TREE_TYPE (a2);
382 tree result = convert (result_type, integer_one_node);
383 tree a1_is_null = convert (result_type, integer_zero_node);
384 tree a2_is_null = convert (result_type, integer_zero_node);
385 bool length_zero_p = false;
387 /* Process each dimension separately and compare the lengths. If any
388 dimension has a size known to be zero, set SIZE_ZERO_P to 1 to
389 suppress the comparison of the data. */
390 while (TREE_CODE (t1) == ARRAY_TYPE && TREE_CODE (t2) == ARRAY_TYPE)
392 tree lb1 = TYPE_MIN_VALUE (TYPE_DOMAIN (t1));
393 tree ub1 = TYPE_MAX_VALUE (TYPE_DOMAIN (t1));
394 tree lb2 = TYPE_MIN_VALUE (TYPE_DOMAIN (t2));
395 tree ub2 = TYPE_MAX_VALUE (TYPE_DOMAIN (t2));
396 tree bt = get_base_type (TREE_TYPE (lb1));
397 tree length1 = fold_build2 (MINUS_EXPR, bt, ub1, lb1);
398 tree length2 = fold_build2 (MINUS_EXPR, bt, ub2, lb2);
401 tree comparison, this_a1_is_null, this_a2_is_null;
403 /* If the length of the first array is a constant, swap our operands
404 unless the length of the second array is the constant zero.
405 Note that we have set the `length' values to the length - 1. */
406 if (TREE_CODE (length1) == INTEGER_CST
407 && !integer_zerop (fold_build2 (PLUS_EXPR, bt, length2,
408 convert (bt, integer_one_node))))
410 tem = a1, a1 = a2, a2 = tem;
411 tem = t1, t1 = t2, t2 = tem;
412 tem = lb1, lb1 = lb2, lb2 = tem;
413 tem = ub1, ub1 = ub2, ub2 = tem;
414 tem = length1, length1 = length2, length2 = tem;
415 tem = a1_is_null, a1_is_null = a2_is_null, a2_is_null = tem;
418 /* If the length of this dimension in the second array is the constant
419 zero, we can just go inside the original bounds for the first
420 array and see if last < first. */
421 if (integer_zerop (fold_build2 (PLUS_EXPR, bt, length2,
422 convert (bt, integer_one_node))))
424 tree ub = TYPE_MAX_VALUE (TYPE_INDEX_TYPE (TYPE_DOMAIN (t1)));
425 tree lb = TYPE_MIN_VALUE (TYPE_INDEX_TYPE (TYPE_DOMAIN (t1)));
427 comparison = build_binary_op (LT_EXPR, result_type, ub, lb);
428 comparison = SUBSTITUTE_PLACEHOLDER_IN_EXPR (comparison, a1);
429 length1 = SUBSTITUTE_PLACEHOLDER_IN_EXPR (length1, a1);
431 length_zero_p = true;
432 this_a1_is_null = comparison;
433 this_a2_is_null = convert (result_type, integer_one_node);
436 /* If the length is some other constant value, we know that the
437 this dimension in the first array cannot be superflat, so we
438 can just use its length from the actual stored bounds. */
439 else if (TREE_CODE (length2) == INTEGER_CST)
441 ub1 = TYPE_MAX_VALUE (TYPE_INDEX_TYPE (TYPE_DOMAIN (t1)));
442 lb1 = TYPE_MIN_VALUE (TYPE_INDEX_TYPE (TYPE_DOMAIN (t1)));
443 ub2 = TYPE_MAX_VALUE (TYPE_INDEX_TYPE (TYPE_DOMAIN (t2)));
444 lb2 = TYPE_MIN_VALUE (TYPE_INDEX_TYPE (TYPE_DOMAIN (t2)));
445 nbt = get_base_type (TREE_TYPE (ub1));
448 = build_binary_op (EQ_EXPR, result_type,
449 build_binary_op (MINUS_EXPR, nbt, ub1, lb1),
450 build_binary_op (MINUS_EXPR, nbt, ub2, lb2));
452 /* Note that we know that UB2 and LB2 are constant and hence
453 cannot contain a PLACEHOLDER_EXPR. */
455 comparison = SUBSTITUTE_PLACEHOLDER_IN_EXPR (comparison, a1);
456 length1 = SUBSTITUTE_PLACEHOLDER_IN_EXPR (length1, a1);
458 this_a1_is_null = build_binary_op (LT_EXPR, result_type, ub1, lb1);
459 this_a2_is_null = convert (result_type, integer_zero_node);
462 /* Otherwise compare the computed lengths. */
465 length1 = SUBSTITUTE_PLACEHOLDER_IN_EXPR (length1, a1);
466 length2 = SUBSTITUTE_PLACEHOLDER_IN_EXPR (length2, a2);
469 = build_binary_op (EQ_EXPR, result_type, length1, length2);
472 = build_binary_op (LT_EXPR, result_type, length1,
473 convert (bt, integer_zero_node));
475 = build_binary_op (LT_EXPR, result_type, length2,
476 convert (bt, integer_zero_node));
479 result = build_binary_op (TRUTH_ANDIF_EXPR, result_type,
482 a1_is_null = build_binary_op (TRUTH_ORIF_EXPR, result_type,
483 this_a1_is_null, a1_is_null);
484 a2_is_null = build_binary_op (TRUTH_ORIF_EXPR, result_type,
485 this_a2_is_null, a2_is_null);
491 /* Unless the size of some bound is known to be zero, compare the
492 data in the array. */
495 tree type = find_common_type (TREE_TYPE (a1), TREE_TYPE (a2));
498 a1 = convert (type, a1), a2 = convert (type, a2);
500 result = build_binary_op (TRUTH_ANDIF_EXPR, result_type, result,
501 fold_build2 (EQ_EXPR, result_type, a1, a2));
505 /* The result is also true if both sizes are zero. */
506 result = build_binary_op (TRUTH_ORIF_EXPR, result_type,
507 build_binary_op (TRUTH_ANDIF_EXPR, result_type,
508 a1_is_null, a2_is_null),
511 /* If either operand contains SAVE_EXPRs, they have to be evaluated before
512 starting the comparison above since the place it would be otherwise
513 evaluated would be wrong. */
515 if (contains_save_expr_p (a1))
516 result = build2 (COMPOUND_EXPR, result_type, a1, result);
518 if (contains_save_expr_p (a2))
519 result = build2 (COMPOUND_EXPR, result_type, a2, result);
524 /* Compute the result of applying OP_CODE to LHS and RHS, where both are of
525 type TYPE. We know that TYPE is a modular type with a nonbinary
529 nonbinary_modular_operation (enum tree_code op_code, tree type, tree lhs,
532 tree modulus = TYPE_MODULUS (type);
533 unsigned int needed_precision = tree_floor_log2 (modulus) + 1;
534 unsigned int precision;
535 bool unsignedp = true;
539 /* If this is an addition of a constant, convert it to a subtraction
540 of a constant since we can do that faster. */
541 if (op_code == PLUS_EXPR && TREE_CODE (rhs) == INTEGER_CST)
543 rhs = fold_build2 (MINUS_EXPR, type, modulus, rhs);
544 op_code = MINUS_EXPR;
547 /* For the logical operations, we only need PRECISION bits. For
548 addition and subtraction, we need one more and for multiplication we
549 need twice as many. But we never want to make a size smaller than
551 if (op_code == PLUS_EXPR || op_code == MINUS_EXPR)
552 needed_precision += 1;
553 else if (op_code == MULT_EXPR)
554 needed_precision *= 2;
556 precision = MAX (needed_precision, TYPE_PRECISION (op_type));
558 /* Unsigned will do for everything but subtraction. */
559 if (op_code == MINUS_EXPR)
562 /* If our type is the wrong signedness or isn't wide enough, make a new
563 type and convert both our operands to it. */
564 if (TYPE_PRECISION (op_type) < precision
565 || TYPE_UNSIGNED (op_type) != unsignedp)
567 /* Copy the node so we ensure it can be modified to make it modular. */
568 op_type = copy_node (gnat_type_for_size (precision, unsignedp));
569 modulus = convert (op_type, modulus);
570 SET_TYPE_MODULUS (op_type, modulus);
571 TYPE_MODULAR_P (op_type) = 1;
572 lhs = convert (op_type, lhs);
573 rhs = convert (op_type, rhs);
576 /* Do the operation, then we'll fix it up. */
577 result = fold_build2 (op_code, op_type, lhs, rhs);
579 /* For multiplication, we have no choice but to do a full modulus
580 operation. However, we want to do this in the narrowest
582 if (op_code == MULT_EXPR)
584 tree div_type = copy_node (gnat_type_for_size (needed_precision, 1));
585 modulus = convert (div_type, modulus);
586 SET_TYPE_MODULUS (div_type, modulus);
587 TYPE_MODULAR_P (div_type) = 1;
588 result = convert (op_type,
589 fold_build2 (TRUNC_MOD_EXPR, div_type,
590 convert (div_type, result), modulus));
593 /* For subtraction, add the modulus back if we are negative. */
594 else if (op_code == MINUS_EXPR)
596 result = save_expr (result);
597 result = fold_build3 (COND_EXPR, op_type,
598 fold_build2 (LT_EXPR, integer_type_node, result,
599 convert (op_type, integer_zero_node)),
600 fold_build2 (PLUS_EXPR, op_type, result, modulus),
604 /* For the other operations, subtract the modulus if we are >= it. */
607 result = save_expr (result);
608 result = fold_build3 (COND_EXPR, op_type,
609 fold_build2 (GE_EXPR, integer_type_node,
611 fold_build2 (MINUS_EXPR, op_type,
616 return convert (type, result);
619 /* Make a binary operation of kind OP_CODE. RESULT_TYPE is the type
620 desired for the result. Usually the operation is to be performed
621 in that type. For MODIFY_EXPR and ARRAY_REF, RESULT_TYPE may be 0
622 in which case the type to be used will be derived from the operands.
624 This function is very much unlike the ones for C and C++ since we
625 have already done any type conversion and matching required. All we
626 have to do here is validate the work done by SEM and handle subtypes. */
629 build_binary_op (enum tree_code op_code, tree result_type,
630 tree left_operand, tree right_operand)
632 tree left_type = TREE_TYPE (left_operand);
633 tree right_type = TREE_TYPE (right_operand);
634 tree left_base_type = get_base_type (left_type);
635 tree right_base_type = get_base_type (right_type);
636 tree operation_type = result_type;
637 tree best_type = NULL_TREE;
638 tree modulus, result;
639 bool has_side_effects = false;
642 && TREE_CODE (operation_type) == RECORD_TYPE
643 && TYPE_JUSTIFIED_MODULAR_P (operation_type))
644 operation_type = TREE_TYPE (TYPE_FIELDS (operation_type));
647 && !AGGREGATE_TYPE_P (operation_type)
648 && TYPE_EXTRA_SUBTYPE_P (operation_type))
649 operation_type = get_base_type (operation_type);
651 modulus = (operation_type
652 && TREE_CODE (operation_type) == INTEGER_TYPE
653 && TYPE_MODULAR_P (operation_type)
654 ? TYPE_MODULUS (operation_type) : NULL_TREE);
659 /* If there were integral or pointer conversions on the LHS, remove
660 them; we'll be putting them back below if needed. Likewise for
661 conversions between array and record types, except for justified
662 modular types. But don't do this if the right operand is not
663 BLKmode (for packed arrays) unless we are not changing the mode. */
664 while ((CONVERT_EXPR_P (left_operand)
665 || TREE_CODE (left_operand) == VIEW_CONVERT_EXPR)
666 && (((INTEGRAL_TYPE_P (left_type)
667 || POINTER_TYPE_P (left_type))
668 && (INTEGRAL_TYPE_P (TREE_TYPE
669 (TREE_OPERAND (left_operand, 0)))
670 || POINTER_TYPE_P (TREE_TYPE
671 (TREE_OPERAND (left_operand, 0)))))
672 || (((TREE_CODE (left_type) == RECORD_TYPE
673 && !TYPE_JUSTIFIED_MODULAR_P (left_type))
674 || TREE_CODE (left_type) == ARRAY_TYPE)
675 && ((TREE_CODE (TREE_TYPE
676 (TREE_OPERAND (left_operand, 0)))
678 || (TREE_CODE (TREE_TYPE
679 (TREE_OPERAND (left_operand, 0)))
681 && (TYPE_MODE (right_type) == BLKmode
682 || (TYPE_MODE (left_type)
683 == TYPE_MODE (TREE_TYPE
685 (left_operand, 0))))))))
687 left_operand = TREE_OPERAND (left_operand, 0);
688 left_type = TREE_TYPE (left_operand);
691 /* If a class-wide type may be involved, force use of the RHS type. */
692 if ((TREE_CODE (right_type) == RECORD_TYPE
693 || TREE_CODE (right_type) == UNION_TYPE)
694 && TYPE_ALIGN_OK (right_type))
695 operation_type = right_type;
697 /* If we are copying between padded objects with compatible types, use
698 the padded view of the objects, this is very likely more efficient.
699 Likewise for a padded that is assigned a constructor, in order to
700 avoid putting a VIEW_CONVERT_EXPR on the LHS. But don't do this if
701 we wouldn't have actually copied anything. */
702 else if (TREE_CODE (left_type) == RECORD_TYPE
703 && TYPE_IS_PADDING_P (left_type)
704 && TREE_CONSTANT (TYPE_SIZE (left_type))
705 && ((TREE_CODE (right_operand) == COMPONENT_REF
706 && TREE_CODE (TREE_TYPE (TREE_OPERAND (right_operand, 0)))
709 (TREE_TYPE (TREE_OPERAND (right_operand, 0)))
710 && gnat_types_compatible_p
712 TREE_TYPE (TREE_OPERAND (right_operand, 0))))
713 || TREE_CODE (right_operand) == CONSTRUCTOR)
714 && !integer_zerop (TYPE_SIZE (right_type)))
715 operation_type = left_type;
717 /* Find the best type to use for copying between aggregate types. */
718 else if (((TREE_CODE (left_type) == ARRAY_TYPE
719 && TREE_CODE (right_type) == ARRAY_TYPE)
720 || (TREE_CODE (left_type) == RECORD_TYPE
721 && TREE_CODE (right_type) == RECORD_TYPE))
722 && (best_type = find_common_type (left_type, right_type)))
723 operation_type = best_type;
725 /* Otherwise use the LHS type. */
726 else if (!operation_type)
727 operation_type = left_type;
729 /* Ensure everything on the LHS is valid. If we have a field reference,
730 strip anything that get_inner_reference can handle. Then remove any
731 conversions between types having the same code and mode. And mark
732 VIEW_CONVERT_EXPRs with TREE_ADDRESSABLE. When done, we must have
733 either an INDIRECT_REF, a NULL_EXPR or a DECL node. */
734 result = left_operand;
737 tree restype = TREE_TYPE (result);
739 if (TREE_CODE (result) == COMPONENT_REF
740 || TREE_CODE (result) == ARRAY_REF
741 || TREE_CODE (result) == ARRAY_RANGE_REF)
742 while (handled_component_p (result))
743 result = TREE_OPERAND (result, 0);
744 else if (TREE_CODE (result) == REALPART_EXPR
745 || TREE_CODE (result) == IMAGPART_EXPR
746 || (CONVERT_EXPR_P (result)
747 && (((TREE_CODE (restype)
748 == TREE_CODE (TREE_TYPE
749 (TREE_OPERAND (result, 0))))
750 && (TYPE_MODE (TREE_TYPE
751 (TREE_OPERAND (result, 0)))
752 == TYPE_MODE (restype)))
753 || TYPE_ALIGN_OK (restype))))
754 result = TREE_OPERAND (result, 0);
755 else if (TREE_CODE (result) == VIEW_CONVERT_EXPR)
757 TREE_ADDRESSABLE (result) = 1;
758 result = TREE_OPERAND (result, 0);
764 gcc_assert (TREE_CODE (result) == INDIRECT_REF
765 || TREE_CODE (result) == NULL_EXPR
768 /* Convert the right operand to the operation type unless it is
769 either already of the correct type or if the type involves a
770 placeholder, since the RHS may not have the same record type. */
771 if (operation_type != right_type
772 && !CONTAINS_PLACEHOLDER_P (TYPE_SIZE (operation_type)))
774 right_operand = convert (operation_type, right_operand);
775 right_type = operation_type;
778 /* If the left operand is not of the same type as the operation
779 type, wrap it up in a VIEW_CONVERT_EXPR. */
780 if (left_type != operation_type)
781 left_operand = unchecked_convert (operation_type, left_operand, false);
783 has_side_effects = true;
789 operation_type = TREE_TYPE (left_type);
791 /* ... fall through ... */
793 case ARRAY_RANGE_REF:
794 /* First look through conversion between type variants. Note that
795 this changes neither the operation type nor the type domain. */
796 if (TREE_CODE (left_operand) == VIEW_CONVERT_EXPR
797 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_OPERAND (left_operand, 0)))
798 == TYPE_MAIN_VARIANT (left_type))
800 left_operand = TREE_OPERAND (left_operand, 0);
801 left_type = TREE_TYPE (left_operand);
804 /* Then convert the right operand to its base type. This will
805 prevent unneeded signedness conversions when sizetype is wider than
807 right_operand = convert (right_base_type, right_operand);
808 right_operand = convert (TYPE_DOMAIN (left_type), right_operand);
810 if (!TREE_CONSTANT (right_operand)
811 || !TREE_CONSTANT (TYPE_MIN_VALUE (right_type)))
812 gnat_mark_addressable (left_operand);
821 gcc_assert (!POINTER_TYPE_P (left_type));
823 /* ... fall through ... */
827 /* If either operand is a NULL_EXPR, just return a new one. */
828 if (TREE_CODE (left_operand) == NULL_EXPR)
829 return build2 (op_code, result_type,
830 build1 (NULL_EXPR, integer_type_node,
831 TREE_OPERAND (left_operand, 0)),
834 else if (TREE_CODE (right_operand) == NULL_EXPR)
835 return build2 (op_code, result_type,
836 build1 (NULL_EXPR, integer_type_node,
837 TREE_OPERAND (right_operand, 0)),
840 /* If either object is a justified modular types, get the
841 fields from within. */
842 if (TREE_CODE (left_type) == RECORD_TYPE
843 && TYPE_JUSTIFIED_MODULAR_P (left_type))
845 left_operand = convert (TREE_TYPE (TYPE_FIELDS (left_type)),
847 left_type = TREE_TYPE (left_operand);
848 left_base_type = get_base_type (left_type);
851 if (TREE_CODE (right_type) == RECORD_TYPE
852 && TYPE_JUSTIFIED_MODULAR_P (right_type))
854 right_operand = convert (TREE_TYPE (TYPE_FIELDS (right_type)),
856 right_type = TREE_TYPE (right_operand);
857 right_base_type = get_base_type (right_type);
860 /* If both objects are arrays, compare them specially. */
861 if ((TREE_CODE (left_type) == ARRAY_TYPE
862 || (TREE_CODE (left_type) == INTEGER_TYPE
863 && TYPE_HAS_ACTUAL_BOUNDS_P (left_type)))
864 && (TREE_CODE (right_type) == ARRAY_TYPE
865 || (TREE_CODE (right_type) == INTEGER_TYPE
866 && TYPE_HAS_ACTUAL_BOUNDS_P (right_type))))
868 result = compare_arrays (result_type, left_operand, right_operand);
870 if (op_code == NE_EXPR)
871 result = invert_truthvalue (result);
873 gcc_assert (op_code == EQ_EXPR);
878 /* Otherwise, the base types must be the same unless the objects are
879 fat pointers or records. If we have records, use the best type and
880 convert both operands to that type. */
881 if (left_base_type != right_base_type)
883 if (TYPE_FAT_POINTER_P (left_base_type)
884 && TYPE_FAT_POINTER_P (right_base_type)
885 && TYPE_MAIN_VARIANT (left_base_type)
886 == TYPE_MAIN_VARIANT (right_base_type))
887 best_type = left_base_type;
888 else if (TREE_CODE (left_base_type) == RECORD_TYPE
889 && TREE_CODE (right_base_type) == RECORD_TYPE)
891 /* The only way these are permitted to be the same is if both
892 types have the same name. In that case, one of them must
893 not be self-referential. Use that one as the best type.
894 Even better is if one is of fixed size. */
895 gcc_assert (TYPE_NAME (left_base_type)
896 && (TYPE_NAME (left_base_type)
897 == TYPE_NAME (right_base_type)));
899 if (TREE_CONSTANT (TYPE_SIZE (left_base_type)))
900 best_type = left_base_type;
901 else if (TREE_CONSTANT (TYPE_SIZE (right_base_type)))
902 best_type = right_base_type;
903 else if (!CONTAINS_PLACEHOLDER_P (TYPE_SIZE (left_base_type)))
904 best_type = left_base_type;
905 else if (!CONTAINS_PLACEHOLDER_P (TYPE_SIZE (right_base_type)))
906 best_type = right_base_type;
913 left_operand = convert (best_type, left_operand);
914 right_operand = convert (best_type, right_operand);
917 /* If we are comparing a fat pointer against zero, we need to
918 just compare the data pointer. */
919 else if (TYPE_FAT_POINTER_P (left_base_type)
920 && TREE_CODE (right_operand) == CONSTRUCTOR
921 && integer_zerop (VEC_index (constructor_elt,
922 CONSTRUCTOR_ELTS (right_operand),
926 right_operand = build_component_ref (left_operand, NULL_TREE,
927 TYPE_FIELDS (left_base_type),
929 left_operand = convert (TREE_TYPE (right_operand),
934 left_operand = convert (left_base_type, left_operand);
935 right_operand = convert (right_base_type, right_operand);
941 case PREINCREMENT_EXPR:
942 case PREDECREMENT_EXPR:
943 case POSTINCREMENT_EXPR:
944 case POSTDECREMENT_EXPR:
945 /* These operations are not used anymore. */
952 /* The RHS of a shift can be any type. Also, ignore any modulus
953 (we used to abort, but this is needed for unchecked conversion
954 to modular types). Otherwise, processing is the same as normal. */
955 gcc_assert (operation_type == left_base_type);
957 left_operand = convert (operation_type, left_operand);
960 case TRUTH_ANDIF_EXPR:
961 case TRUTH_ORIF_EXPR:
965 left_operand = gnat_truthvalue_conversion (left_operand);
966 right_operand = gnat_truthvalue_conversion (right_operand);
972 /* For binary modulus, if the inputs are in range, so are the
974 if (modulus && integer_pow2p (modulus))
979 gcc_assert (TREE_TYPE (result_type) == left_base_type
980 && TREE_TYPE (result_type) == right_base_type);
981 left_operand = convert (left_base_type, left_operand);
982 right_operand = convert (right_base_type, right_operand);
985 case TRUNC_DIV_EXPR: case TRUNC_MOD_EXPR:
986 case CEIL_DIV_EXPR: case CEIL_MOD_EXPR:
987 case FLOOR_DIV_EXPR: case FLOOR_MOD_EXPR:
988 case ROUND_DIV_EXPR: case ROUND_MOD_EXPR:
989 /* These always produce results lower than either operand. */
993 case POINTER_PLUS_EXPR:
994 gcc_assert (operation_type == left_base_type
995 && sizetype == right_base_type);
996 left_operand = convert (operation_type, left_operand);
997 right_operand = convert (sizetype, right_operand);
1000 case PLUS_NOMOD_EXPR:
1001 case MINUS_NOMOD_EXPR:
1002 if (op_code == PLUS_NOMOD_EXPR)
1003 op_code = PLUS_EXPR;
1005 op_code = MINUS_EXPR;
1006 modulus = NULL_TREE;
1008 /* ... fall through ... */
1012 /* Avoid doing arithmetics in ENUMERAL_TYPE or BOOLEAN_TYPE like the
1013 other compilers. Contrary to C, Ada doesn't allow arithmetics in
1014 these types but can generate addition/subtraction for Succ/Pred. */
1016 && (TREE_CODE (operation_type) == ENUMERAL_TYPE
1017 || TREE_CODE (operation_type) == BOOLEAN_TYPE))
1018 operation_type = left_base_type = right_base_type
1019 = gnat_type_for_mode (TYPE_MODE (operation_type),
1020 TYPE_UNSIGNED (operation_type));
1022 /* ... fall through ... */
1026 /* The result type should be the same as the base types of the
1027 both operands (and they should be the same). Convert
1028 everything to the result type. */
1030 gcc_assert (operation_type == left_base_type
1031 && left_base_type == right_base_type);
1032 left_operand = convert (operation_type, left_operand);
1033 right_operand = convert (operation_type, right_operand);
1036 if (modulus && !integer_pow2p (modulus))
1038 result = nonbinary_modular_operation (op_code, operation_type,
1039 left_operand, right_operand);
1040 modulus = NULL_TREE;
1042 /* If either operand is a NULL_EXPR, just return a new one. */
1043 else if (TREE_CODE (left_operand) == NULL_EXPR)
1044 return build1 (NULL_EXPR, operation_type, TREE_OPERAND (left_operand, 0));
1045 else if (TREE_CODE (right_operand) == NULL_EXPR)
1046 return build1 (NULL_EXPR, operation_type, TREE_OPERAND (right_operand, 0));
1047 else if (op_code == ARRAY_REF || op_code == ARRAY_RANGE_REF)
1048 result = fold (build4 (op_code, operation_type, left_operand,
1049 right_operand, NULL_TREE, NULL_TREE));
1052 = fold_build2 (op_code, operation_type, left_operand, right_operand);
1054 TREE_SIDE_EFFECTS (result) |= has_side_effects;
1055 TREE_CONSTANT (result)
1056 |= (TREE_CONSTANT (left_operand) & TREE_CONSTANT (right_operand)
1057 && op_code != ARRAY_REF && op_code != ARRAY_RANGE_REF);
1059 if ((op_code == ARRAY_REF || op_code == ARRAY_RANGE_REF)
1060 && TYPE_VOLATILE (operation_type))
1061 TREE_THIS_VOLATILE (result) = 1;
1063 /* If we are working with modular types, perform the MOD operation
1064 if something above hasn't eliminated the need for it. */
1066 result = fold_build2 (FLOOR_MOD_EXPR, operation_type, result,
1067 convert (operation_type, modulus));
1069 if (result_type && result_type != operation_type)
1070 result = convert (result_type, result);
1075 /* Similar, but for unary operations. */
1078 build_unary_op (enum tree_code op_code, tree result_type, tree operand)
1080 tree type = TREE_TYPE (operand);
1081 tree base_type = get_base_type (type);
1082 tree operation_type = result_type;
1084 bool side_effects = false;
1087 && TREE_CODE (operation_type) == RECORD_TYPE
1088 && TYPE_JUSTIFIED_MODULAR_P (operation_type))
1089 operation_type = TREE_TYPE (TYPE_FIELDS (operation_type));
1092 && !AGGREGATE_TYPE_P (operation_type)
1093 && TYPE_EXTRA_SUBTYPE_P (operation_type))
1094 operation_type = get_base_type (operation_type);
1100 if (!operation_type)
1101 result_type = operation_type = TREE_TYPE (type);
1103 gcc_assert (result_type == TREE_TYPE (type));
1105 result = fold_build1 (op_code, operation_type, operand);
1108 case TRUTH_NOT_EXPR:
1109 gcc_assert (result_type == base_type);
1110 result = invert_truthvalue (gnat_truthvalue_conversion (operand));
1113 case ATTR_ADDR_EXPR:
1115 switch (TREE_CODE (operand))
1118 case UNCONSTRAINED_ARRAY_REF:
1119 result = TREE_OPERAND (operand, 0);
1121 /* Make sure the type here is a pointer, not a reference.
1122 GCC wants pointer types for function addresses. */
1124 result_type = build_pointer_type (type);
1126 /* If the underlying object can alias everything, propagate the
1127 property since we are effectively retrieving the object. */
1128 if (POINTER_TYPE_P (TREE_TYPE (result))
1129 && TYPE_REF_CAN_ALIAS_ALL (TREE_TYPE (result)))
1131 if (TREE_CODE (result_type) == POINTER_TYPE
1132 && !TYPE_REF_CAN_ALIAS_ALL (result_type))
1134 = build_pointer_type_for_mode (TREE_TYPE (result_type),
1135 TYPE_MODE (result_type),
1137 else if (TREE_CODE (result_type) == REFERENCE_TYPE
1138 && !TYPE_REF_CAN_ALIAS_ALL (result_type))
1140 = build_reference_type_for_mode (TREE_TYPE (result_type),
1141 TYPE_MODE (result_type),
1148 TREE_TYPE (result) = type = build_pointer_type (type);
1152 case ARRAY_RANGE_REF:
1155 /* If this is for 'Address, find the address of the prefix and
1156 add the offset to the field. Otherwise, do this the normal
1158 if (op_code == ATTR_ADDR_EXPR)
1160 HOST_WIDE_INT bitsize;
1161 HOST_WIDE_INT bitpos;
1163 enum machine_mode mode;
1164 int unsignedp, volatilep;
1166 inner = get_inner_reference (operand, &bitsize, &bitpos, &offset,
1167 &mode, &unsignedp, &volatilep,
1170 /* If INNER is a padding type whose field has a self-referential
1171 size, convert to that inner type. We know the offset is zero
1172 and we need to have that type visible. */
1173 if (TREE_CODE (TREE_TYPE (inner)) == RECORD_TYPE
1174 && TYPE_IS_PADDING_P (TREE_TYPE (inner))
1175 && (CONTAINS_PLACEHOLDER_P
1176 (TYPE_SIZE (TREE_TYPE (TYPE_FIELDS
1177 (TREE_TYPE (inner)))))))
1178 inner = convert (TREE_TYPE (TYPE_FIELDS (TREE_TYPE (inner))),
1181 /* Compute the offset as a byte offset from INNER. */
1183 offset = size_zero_node;
1185 if (bitpos % BITS_PER_UNIT != 0)
1187 ("taking address of object not aligned on storage unit?",
1190 offset = size_binop (PLUS_EXPR, offset,
1191 size_int (bitpos / BITS_PER_UNIT));
1193 /* Take the address of INNER, convert the offset to void *, and
1194 add then. It will later be converted to the desired result
1196 inner = build_unary_op (ADDR_EXPR, NULL_TREE, inner);
1197 inner = convert (ptr_void_type_node, inner);
1198 result = build_binary_op (POINTER_PLUS_EXPR, ptr_void_type_node,
1200 result = convert (build_pointer_type (TREE_TYPE (operand)),
1207 /* If this is just a constructor for a padded record, we can
1208 just take the address of the single field and convert it to
1209 a pointer to our type. */
1210 if (TREE_CODE (type) == RECORD_TYPE && TYPE_IS_PADDING_P (type))
1212 result = (VEC_index (constructor_elt,
1213 CONSTRUCTOR_ELTS (operand),
1217 result = convert (build_pointer_type (TREE_TYPE (operand)),
1218 build_unary_op (ADDR_EXPR, NULL_TREE, result));
1225 if (AGGREGATE_TYPE_P (type)
1226 && AGGREGATE_TYPE_P (TREE_TYPE (TREE_OPERAND (operand, 0))))
1227 return build_unary_op (ADDR_EXPR, result_type,
1228 TREE_OPERAND (operand, 0));
1230 /* ... fallthru ... */
1232 case VIEW_CONVERT_EXPR:
1233 /* If this just a variant conversion or if the conversion doesn't
1234 change the mode, get the result type from this type and go down.
1235 This is needed for conversions of CONST_DECLs, to eventually get
1236 to the address of their CORRESPONDING_VARs. */
1237 if ((TYPE_MAIN_VARIANT (type)
1238 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_OPERAND (operand, 0))))
1239 || (TYPE_MODE (type) != BLKmode
1240 && (TYPE_MODE (type)
1241 == TYPE_MODE (TREE_TYPE (TREE_OPERAND (operand, 0))))))
1242 return build_unary_op (ADDR_EXPR,
1243 (result_type ? result_type
1244 : build_pointer_type (type)),
1245 TREE_OPERAND (operand, 0));
1249 operand = DECL_CONST_CORRESPONDING_VAR (operand);
1251 /* ... fall through ... */
1256 /* If we are taking the address of a padded record whose field is
1257 contains a template, take the address of the template. */
1258 if (TREE_CODE (type) == RECORD_TYPE
1259 && TYPE_IS_PADDING_P (type)
1260 && TREE_CODE (TREE_TYPE (TYPE_FIELDS (type))) == RECORD_TYPE
1261 && TYPE_CONTAINS_TEMPLATE_P (TREE_TYPE (TYPE_FIELDS (type))))
1263 type = TREE_TYPE (TYPE_FIELDS (type));
1264 operand = convert (type, operand);
1267 if (type != error_mark_node)
1268 operation_type = build_pointer_type (type);
1270 gnat_mark_addressable (operand);
1271 result = fold_build1 (ADDR_EXPR, operation_type, operand);
1274 TREE_CONSTANT (result) = staticp (operand) || TREE_CONSTANT (operand);
1278 /* If we want to refer to an entire unconstrained array,
1279 make up an expression to do so. This will never survive to
1280 the backend. If TYPE is a thin pointer, first convert the
1281 operand to a fat pointer. */
1282 if (TYPE_THIN_POINTER_P (type)
1283 && TYPE_UNCONSTRAINED_ARRAY (TREE_TYPE (type)))
1286 = convert (TREE_TYPE (TYPE_UNCONSTRAINED_ARRAY (TREE_TYPE (type))),
1288 type = TREE_TYPE (operand);
1291 if (TYPE_FAT_POINTER_P (type))
1293 result = build1 (UNCONSTRAINED_ARRAY_REF,
1294 TYPE_UNCONSTRAINED_ARRAY (type), operand);
1295 TREE_READONLY (result) = TREE_STATIC (result)
1296 = TYPE_READONLY (TYPE_UNCONSTRAINED_ARRAY (type));
1298 else if (TREE_CODE (operand) == ADDR_EXPR)
1299 result = TREE_OPERAND (operand, 0);
1303 result = fold_build1 (op_code, TREE_TYPE (type), operand);
1304 TREE_READONLY (result) = TYPE_READONLY (TREE_TYPE (type));
1308 = (!TYPE_FAT_POINTER_P (type) && TYPE_VOLATILE (TREE_TYPE (type)));
1314 tree modulus = ((operation_type
1315 && TREE_CODE (operation_type) == INTEGER_TYPE
1316 && TYPE_MODULAR_P (operation_type))
1317 ? TYPE_MODULUS (operation_type) : NULL_TREE);
1318 int mod_pow2 = modulus && integer_pow2p (modulus);
1320 /* If this is a modular type, there are various possibilities
1321 depending on the operation and whether the modulus is a
1322 power of two or not. */
1326 gcc_assert (operation_type == base_type);
1327 operand = convert (operation_type, operand);
1329 /* The fastest in the negate case for binary modulus is
1330 the straightforward code; the TRUNC_MOD_EXPR below
1331 is an AND operation. */
1332 if (op_code == NEGATE_EXPR && mod_pow2)
1333 result = fold_build2 (TRUNC_MOD_EXPR, operation_type,
1334 fold_build1 (NEGATE_EXPR, operation_type,
1338 /* For nonbinary negate case, return zero for zero operand,
1339 else return the modulus minus the operand. If the modulus
1340 is a power of two minus one, we can do the subtraction
1341 as an XOR since it is equivalent and faster on most machines. */
1342 else if (op_code == NEGATE_EXPR && !mod_pow2)
1344 if (integer_pow2p (fold_build2 (PLUS_EXPR, operation_type,
1346 convert (operation_type,
1347 integer_one_node))))
1348 result = fold_build2 (BIT_XOR_EXPR, operation_type,
1351 result = fold_build2 (MINUS_EXPR, operation_type,
1354 result = fold_build3 (COND_EXPR, operation_type,
1355 fold_build2 (NE_EXPR,
1360 integer_zero_node)),
1365 /* For the NOT cases, we need a constant equal to
1366 the modulus minus one. For a binary modulus, we
1367 XOR against the constant and subtract the operand from
1368 that constant for nonbinary modulus. */
1370 tree cnst = fold_build2 (MINUS_EXPR, operation_type, modulus,
1371 convert (operation_type,
1375 result = fold_build2 (BIT_XOR_EXPR, operation_type,
1378 result = fold_build2 (MINUS_EXPR, operation_type,
1386 /* ... fall through ... */
1389 gcc_assert (operation_type == base_type);
1390 result = fold_build1 (op_code, operation_type,
1391 convert (operation_type, operand));
1396 TREE_SIDE_EFFECTS (result) = 1;
1397 if (TREE_CODE (result) == INDIRECT_REF)
1398 TREE_THIS_VOLATILE (result) = TYPE_VOLATILE (TREE_TYPE (result));
1401 if (result_type && TREE_TYPE (result) != result_type)
1402 result = convert (result_type, result);
1407 /* Similar, but for COND_EXPR. */
1410 build_cond_expr (tree result_type, tree condition_operand,
1411 tree true_operand, tree false_operand)
1414 bool addr_p = false;
1416 /* The front-end verifies that result, true and false operands have same base
1417 type. Convert everything to the result type. */
1419 true_operand = convert (result_type, true_operand);
1420 false_operand = convert (result_type, false_operand);
1422 /* If the result type is unconstrained, take the address of
1423 the operands and then dereference our result. */
1424 if (TREE_CODE (result_type) == UNCONSTRAINED_ARRAY_TYPE
1425 || CONTAINS_PLACEHOLDER_P (TYPE_SIZE (result_type)))
1428 result_type = build_pointer_type (result_type);
1429 true_operand = build_unary_op (ADDR_EXPR, result_type, true_operand);
1430 false_operand = build_unary_op (ADDR_EXPR, result_type, false_operand);
1433 result = fold_build3 (COND_EXPR, result_type, condition_operand,
1434 true_operand, false_operand);
1436 /* If either operand is a SAVE_EXPR (possibly surrounded by
1437 arithmetic, make sure it gets done. */
1438 true_operand = skip_simple_arithmetic (true_operand);
1439 false_operand = skip_simple_arithmetic (false_operand);
1441 if (TREE_CODE (true_operand) == SAVE_EXPR)
1442 result = build2 (COMPOUND_EXPR, result_type, true_operand, result);
1444 if (TREE_CODE (false_operand) == SAVE_EXPR)
1445 result = build2 (COMPOUND_EXPR, result_type, false_operand, result);
1447 /* ??? Seems the code above is wrong, as it may move ahead of the COND
1448 SAVE_EXPRs with side effects and not shared by both arms. */
1451 result = build_unary_op (INDIRECT_REF, NULL_TREE, result);
1456 /* Similar, but for RETURN_EXPR. If RESULT_DECL is non-zero, build
1457 a RETURN_EXPR around the assignment of RET_VAL to RESULT_DECL.
1458 If RESULT_DECL is zero, build a bare RETURN_EXPR. */
1461 build_return_expr (tree result_decl, tree ret_val)
1467 /* The gimplifier explicitly enforces the following invariant:
1476 As a consequence, type-homogeneity dictates that we use the type
1477 of the RESULT_DECL as the operation type. */
1479 tree operation_type = TREE_TYPE (result_decl);
1481 /* Convert the right operand to the operation type. Note that
1482 it's the same transformation as in the MODIFY_EXPR case of
1483 build_binary_op with the additional guarantee that the type
1484 cannot involve a placeholder, since otherwise the function
1485 would use the "target pointer" return mechanism. */
1487 if (operation_type != TREE_TYPE (ret_val))
1488 ret_val = convert (operation_type, ret_val);
1491 = build2 (MODIFY_EXPR, operation_type, result_decl, ret_val);
1494 result_expr = NULL_TREE;
1496 return build1 (RETURN_EXPR, void_type_node, result_expr);
1499 /* Build a CALL_EXPR to call FUNDECL with one argument, ARG. Return
1503 build_call_1_expr (tree fundecl, tree arg)
1505 tree call = build_call_nary (TREE_TYPE (TREE_TYPE (fundecl)),
1506 build_unary_op (ADDR_EXPR, NULL_TREE, fundecl),
1508 TREE_SIDE_EFFECTS (call) = 1;
1512 /* Build a CALL_EXPR to call FUNDECL with two arguments, ARG1 & ARG2. Return
1516 build_call_2_expr (tree fundecl, tree arg1, tree arg2)
1518 tree call = build_call_nary (TREE_TYPE (TREE_TYPE (fundecl)),
1519 build_unary_op (ADDR_EXPR, NULL_TREE, fundecl),
1521 TREE_SIDE_EFFECTS (call) = 1;
1525 /* Likewise to call FUNDECL with no arguments. */
1528 build_call_0_expr (tree fundecl)
1530 /* We rely on build_call_nary to compute TREE_SIDE_EFFECTS. This makes
1531 it possible to propagate DECL_IS_PURE on parameterless functions. */
1532 tree call = build_call_nary (TREE_TYPE (TREE_TYPE (fundecl)),
1533 build_unary_op (ADDR_EXPR, NULL_TREE, fundecl),
1538 /* Call a function that raises an exception and pass the line number and file
1539 name, if requested. MSG says which exception function to call.
1541 GNAT_NODE is the gnat node conveying the source location for which the
1542 error should be signaled, or Empty in which case the error is signaled on
1543 the current ref_file_name/input_line.
1545 KIND says which kind of exception this is for
1546 (N_Raise_{Constraint,Storage,Program}_Error). */
1549 build_call_raise (int msg, Node_Id gnat_node, char kind)
1551 tree fndecl = gnat_raise_decls[msg];
1552 tree label = get_exception_label (kind);
1558 /* If this is to be done as a goto, handle that case. */
1561 Entity_Id local_raise = Get_Local_Raise_Call_Entity ();
1562 tree gnu_result = build1 (GOTO_EXPR, void_type_node, label);
1564 /* If Local_Raise is present, generate
1565 Local_Raise (exception'Identity); */
1566 if (Present (local_raise))
1568 tree gnu_local_raise
1569 = gnat_to_gnu_entity (local_raise, NULL_TREE, 0);
1570 tree gnu_exception_entity
1571 = gnat_to_gnu_entity (Get_RT_Exception_Entity (msg), NULL_TREE, 0);
1573 = build_call_1_expr (gnu_local_raise,
1574 build_unary_op (ADDR_EXPR, NULL_TREE,
1575 gnu_exception_entity));
1577 gnu_result = build2 (COMPOUND_EXPR, void_type_node,
1578 gnu_call, gnu_result);}
1584 = (Debug_Flag_NN || Exception_Locations_Suppressed)
1586 : (gnat_node != Empty && Sloc (gnat_node) != No_Location)
1587 ? IDENTIFIER_POINTER
1588 (get_identifier (Get_Name_String
1590 (Get_Source_File_Index (Sloc (gnat_node))))))
1594 filename = build_string (len, str);
1596 = (gnat_node != Empty && Sloc (gnat_node) != No_Location)
1597 ? Get_Logical_Line_Number (Sloc(gnat_node)) : input_line;
1599 TREE_TYPE (filename)
1600 = build_array_type (char_type_node, build_index_type (size_int (len)));
1603 build_call_2_expr (fndecl,
1604 build1 (ADDR_EXPR, build_pointer_type (char_type_node),
1606 build_int_cst (NULL_TREE, line_number));
1609 /* qsort comparer for the bit positions of two constructor elements
1610 for record components. */
1613 compare_elmt_bitpos (const PTR rt1, const PTR rt2)
1615 const_tree const elmt1 = * (const_tree const *) rt1;
1616 const_tree const elmt2 = * (const_tree const *) rt2;
1617 const_tree const field1 = TREE_PURPOSE (elmt1);
1618 const_tree const field2 = TREE_PURPOSE (elmt2);
1620 = tree_int_cst_compare (bit_position (field1), bit_position (field2));
1622 return ret ? ret : (int) (DECL_UID (field1) - DECL_UID (field2));
1625 /* Return a CONSTRUCTOR of TYPE whose list is LIST. */
1628 gnat_build_constructor (tree type, tree list)
1632 bool allconstant = (TREE_CODE (TYPE_SIZE (type)) == INTEGER_CST);
1633 bool side_effects = false;
1636 /* Scan the elements to see if they are all constant or if any has side
1637 effects, to let us set global flags on the resulting constructor. Count
1638 the elements along the way for possible sorting purposes below. */
1639 for (n_elmts = 0, elmt = list; elmt; elmt = TREE_CHAIN (elmt), n_elmts ++)
1641 if (!TREE_CONSTANT (TREE_VALUE (elmt))
1642 || (TREE_CODE (type) == RECORD_TYPE
1643 && DECL_BIT_FIELD (TREE_PURPOSE (elmt))
1644 && TREE_CODE (TREE_VALUE (elmt)) != INTEGER_CST)
1645 || !initializer_constant_valid_p (TREE_VALUE (elmt),
1646 TREE_TYPE (TREE_VALUE (elmt))))
1647 allconstant = false;
1649 if (TREE_SIDE_EFFECTS (TREE_VALUE (elmt)))
1650 side_effects = true;
1652 /* Propagate an NULL_EXPR from the size of the type. We won't ever
1653 be executing the code we generate here in that case, but handle it
1654 specially to avoid the compiler blowing up. */
1655 if (TREE_CODE (type) == RECORD_TYPE
1657 = contains_null_expr (DECL_SIZE (TREE_PURPOSE (elmt))))))
1658 return build1 (NULL_EXPR, type, TREE_OPERAND (result, 0));
1661 /* For record types with constant components only, sort field list
1662 by increasing bit position. This is necessary to ensure the
1663 constructor can be output as static data. */
1664 if (allconstant && TREE_CODE (type) == RECORD_TYPE && n_elmts > 1)
1666 /* Fill an array with an element tree per index, and ask qsort to order
1667 them according to what a bitpos comparison function says. */
1668 tree *gnu_arr = (tree *) alloca (sizeof (tree) * n_elmts);
1671 for (i = 0, elmt = list; elmt; elmt = TREE_CHAIN (elmt), i++)
1674 qsort (gnu_arr, n_elmts, sizeof (tree), compare_elmt_bitpos);
1676 /* Then reconstruct the list from the sorted array contents. */
1678 for (i = n_elmts - 1; i >= 0; i--)
1680 TREE_CHAIN (gnu_arr[i]) = list;
1685 result = build_constructor_from_list (type, list);
1686 TREE_CONSTANT (result) = TREE_STATIC (result) = allconstant;
1687 TREE_SIDE_EFFECTS (result) = side_effects;
1688 TREE_READONLY (result) = TYPE_READONLY (type) || allconstant;
1692 /* Return a COMPONENT_REF to access a field that is given by COMPONENT,
1693 an IDENTIFIER_NODE giving the name of the field, or FIELD, a FIELD_DECL,
1694 for the field. Don't fold the result if NO_FOLD_P is true.
1696 We also handle the fact that we might have been passed a pointer to the
1697 actual record and know how to look for fields in variant parts. */
1700 build_simple_component_ref (tree record_variable, tree component,
1701 tree field, bool no_fold_p)
1703 tree record_type = TYPE_MAIN_VARIANT (TREE_TYPE (record_variable));
1704 tree ref, inner_variable;
1706 gcc_assert ((TREE_CODE (record_type) == RECORD_TYPE
1707 || TREE_CODE (record_type) == UNION_TYPE
1708 || TREE_CODE (record_type) == QUAL_UNION_TYPE)
1709 && TYPE_SIZE (record_type)
1710 && (component != 0) != (field != 0));
1712 /* If no field was specified, look for a field with the specified name
1713 in the current record only. */
1715 for (field = TYPE_FIELDS (record_type); field;
1716 field = TREE_CHAIN (field))
1717 if (DECL_NAME (field) == component)
1723 /* If this field is not in the specified record, see if we can find
1724 something in the record whose original field is the same as this one. */
1725 if (DECL_CONTEXT (field) != record_type)
1726 /* Check if there is a field with name COMPONENT in the record. */
1730 /* First loop thru normal components. */
1732 for (new_field = TYPE_FIELDS (record_type); new_field;
1733 new_field = TREE_CHAIN (new_field))
1734 if (field == new_field
1735 || DECL_ORIGINAL_FIELD (new_field) == field
1736 || new_field == DECL_ORIGINAL_FIELD (field)
1737 || (DECL_ORIGINAL_FIELD (field)
1738 && (DECL_ORIGINAL_FIELD (field)
1739 == DECL_ORIGINAL_FIELD (new_field))))
1742 /* Next, loop thru DECL_INTERNAL_P components if we haven't found
1743 the component in the first search. Doing this search in 2 steps
1744 is required to avoiding hidden homonymous fields in the
1748 for (new_field = TYPE_FIELDS (record_type); new_field;
1749 new_field = TREE_CHAIN (new_field))
1750 if (DECL_INTERNAL_P (new_field))
1753 = build_simple_component_ref (record_variable,
1754 NULL_TREE, new_field, no_fold_p);
1755 ref = build_simple_component_ref (field_ref, NULL_TREE, field,
1768 /* If the field's offset has overflowed, do not attempt to access it
1769 as doing so may trigger sanity checks deeper in the back-end.
1770 Note that we don't need to warn since this will be done on trying
1771 to declare the object. */
1772 if (TREE_CODE (DECL_FIELD_OFFSET (field)) == INTEGER_CST
1773 && TREE_OVERFLOW (DECL_FIELD_OFFSET (field)))
1776 /* Look through conversion between type variants. Note that this
1777 is transparent as far as the field is concerned. */
1778 if (TREE_CODE (record_variable) == VIEW_CONVERT_EXPR
1779 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_OPERAND (record_variable, 0)))
1781 inner_variable = TREE_OPERAND (record_variable, 0);
1783 inner_variable = record_variable;
1785 ref = build3 (COMPONENT_REF, TREE_TYPE (field), inner_variable, field,
1788 if (TREE_READONLY (record_variable) || TREE_READONLY (field))
1789 TREE_READONLY (ref) = 1;
1790 if (TREE_THIS_VOLATILE (record_variable) || TREE_THIS_VOLATILE (field)
1791 || TYPE_VOLATILE (record_type))
1792 TREE_THIS_VOLATILE (ref) = 1;
1797 /* The generic folder may punt in this case because the inner array type
1798 can be self-referential, but folding is in fact not problematic. */
1799 else if (TREE_CODE (record_variable) == CONSTRUCTOR
1800 && TYPE_CONTAINS_TEMPLATE_P (TREE_TYPE (record_variable)))
1802 VEC(constructor_elt,gc) *elts = CONSTRUCTOR_ELTS (record_variable);
1803 unsigned HOST_WIDE_INT idx;
1805 FOR_EACH_CONSTRUCTOR_ELT (elts, idx, index, value)
1815 /* Like build_simple_component_ref, except that we give an error if the
1816 reference could not be found. */
1819 build_component_ref (tree record_variable, tree component,
1820 tree field, bool no_fold_p)
1822 tree ref = build_simple_component_ref (record_variable, component, field,
1828 /* If FIELD was specified, assume this is an invalid user field so raise
1829 Constraint_Error. Otherwise, we have no type to return so abort. */
1831 return build1 (NULL_EXPR, TREE_TYPE (field),
1832 build_call_raise (CE_Discriminant_Check_Failed, Empty,
1833 N_Raise_Constraint_Error));
1836 /* Build a GCC tree to call an allocation or deallocation function.
1837 If GNU_OBJ is nonzero, it is an object to deallocate. Otherwise,
1838 generate an allocator.
1840 GNU_SIZE is the size of the object in bytes and ALIGN is the alignment in
1841 bits. GNAT_PROC, if present, is a procedure to call and GNAT_POOL is the
1842 storage pool to use. If not preset, malloc and free will be used except
1843 if GNAT_PROC is the "fake" value of -1, in which case we allocate the
1844 object dynamically on the stack frame. */
1847 build_call_alloc_dealloc (tree gnu_obj, tree gnu_size, unsigned align,
1848 Entity_Id gnat_proc, Entity_Id gnat_pool,
1851 tree gnu_align = size_int (align / BITS_PER_UNIT);
1853 gnu_size = SUBSTITUTE_PLACEHOLDER_IN_EXPR (gnu_size, gnu_obj);
1855 if (Present (gnat_proc))
1857 /* The storage pools are obviously always tagged types, but the
1858 secondary stack uses the same mechanism and is not tagged */
1859 if (Is_Tagged_Type (Etype (gnat_pool)))
1861 /* The size is the third parameter; the alignment is the
1863 Entity_Id gnat_size_type
1864 = Etype (Next_Formal (Next_Formal (First_Formal (gnat_proc))));
1865 tree gnu_size_type = gnat_to_gnu_type (gnat_size_type);
1866 tree gnu_proc = gnat_to_gnu (gnat_proc);
1867 tree gnu_proc_addr = build_unary_op (ADDR_EXPR, NULL_TREE, gnu_proc);
1868 tree gnu_pool = gnat_to_gnu (gnat_pool);
1869 tree gnu_pool_addr = build_unary_op (ADDR_EXPR, NULL_TREE, gnu_pool);
1872 gnu_size = convert (gnu_size_type, gnu_size);
1873 gnu_align = convert (gnu_size_type, gnu_align);
1875 /* The first arg is always the address of the storage pool; next
1876 comes the address of the object, for a deallocator, then the
1877 size and alignment. */
1879 gnu_call = build_call_nary (TREE_TYPE (TREE_TYPE (gnu_proc)),
1880 gnu_proc_addr, 4, gnu_pool_addr,
1881 gnu_obj, gnu_size, gnu_align);
1883 gnu_call = build_call_nary (TREE_TYPE (TREE_TYPE (gnu_proc)),
1884 gnu_proc_addr, 3, gnu_pool_addr,
1885 gnu_size, gnu_align);
1886 TREE_SIDE_EFFECTS (gnu_call) = 1;
1890 /* Secondary stack case. */
1893 /* The size is the second parameter */
1894 Entity_Id gnat_size_type
1895 = Etype (Next_Formal (First_Formal (gnat_proc)));
1896 tree gnu_size_type = gnat_to_gnu_type (gnat_size_type);
1897 tree gnu_proc = gnat_to_gnu (gnat_proc);
1898 tree gnu_proc_addr = build_unary_op (ADDR_EXPR, NULL_TREE, gnu_proc);
1901 gnu_size = convert (gnu_size_type, gnu_size);
1903 /* The first arg is the address of the object, for a
1904 deallocator, then the size */
1906 gnu_call = build_call_nary (TREE_TYPE (TREE_TYPE (gnu_proc)),
1907 gnu_proc_addr, 2, gnu_obj, gnu_size);
1909 gnu_call = build_call_nary (TREE_TYPE (TREE_TYPE (gnu_proc)),
1910 gnu_proc_addr, 1, gnu_size);
1911 TREE_SIDE_EFFECTS (gnu_call) = 1;
1917 return build_call_1_expr (free_decl, gnu_obj);
1919 /* ??? For now, disable variable-sized allocators in the stack since
1920 we can't yet gimplify an ALLOCATE_EXPR. */
1921 else if (gnat_pool == -1
1922 && TREE_CODE (gnu_size) == INTEGER_CST
1923 && flag_stack_check != GENERIC_STACK_CHECK)
1925 /* If the size is a constant, we can put it in the fixed portion of
1926 the stack frame to avoid the need to adjust the stack pointer. */
1928 tree gnu_index = build_index_2_type (size_one_node, gnu_size);
1929 tree gnu_array_type = build_array_type (char_type_node, gnu_index);
1931 = create_var_decl (get_identifier ("RETVAL"), NULL_TREE,
1932 gnu_array_type, NULL_TREE, false, false, false,
1933 false, NULL, gnat_node);
1934 return convert (ptr_void_type_node,
1935 build_unary_op (ADDR_EXPR, NULL_TREE, gnu_decl));
1939 return build2 (ALLOCATE_EXPR, ptr_void_type_node, gnu_size, gnu_align);
1944 if (Nkind (gnat_node) != N_Allocator || !Comes_From_Source (gnat_node))
1945 Check_No_Implicit_Heap_Alloc (gnat_node);
1947 /* If the allocator size is 32bits but the pointer size is 64bits then
1948 allocate 32bit memory (sometimes necessary on 64bit VMS). Otherwise
1949 default to standard malloc. */
1950 if (TARGET_ABI_OPEN_VMS &&
1951 (!TARGET_MALLOC64 ||
1953 && (UI_To_Int (Esize (Etype (gnat_node))) == 32
1954 || Convention (Etype (gnat_node)) == Convention_C))))
1955 return build_call_1_expr (malloc32_decl, gnu_size);
1957 return build_call_1_expr (malloc_decl, gnu_size);
1961 /* Build a GCC tree to correspond to allocating an object of TYPE whose
1962 initial value is INIT, if INIT is nonzero. Convert the expression to
1963 RESULT_TYPE, which must be some type of pointer. Return the tree.
1964 GNAT_PROC and GNAT_POOL optionally give the procedure to call and
1965 the storage pool to use. GNAT_NODE is used to provide an error
1966 location for restriction violations messages. If IGNORE_INIT_TYPE is
1967 true, ignore the type of INIT for the purpose of determining the size;
1968 this will cause the maximum size to be allocated if TYPE is of
1969 self-referential size. */
1972 build_allocator (tree type, tree init, tree result_type, Entity_Id gnat_proc,
1973 Entity_Id gnat_pool, Node_Id gnat_node, bool ignore_init_type)
1975 tree size = TYPE_SIZE_UNIT (type);
1977 unsigned int default_allocator_alignment
1978 = get_target_default_allocator_alignment () * BITS_PER_UNIT;
1980 /* If the initializer, if present, is a NULL_EXPR, just return a new one. */
1981 if (init && TREE_CODE (init) == NULL_EXPR)
1982 return build1 (NULL_EXPR, result_type, TREE_OPERAND (init, 0));
1984 /* If RESULT_TYPE is a fat or thin pointer, set SIZE to be the sum of the
1985 sizes of the object and its template. Allocate the whole thing and
1986 fill in the parts that are known. */
1987 else if (TYPE_FAT_OR_THIN_POINTER_P (result_type))
1990 = build_unc_object_type_from_ptr (result_type, type,
1991 get_identifier ("ALLOC"));
1992 tree template_type = TREE_TYPE (TYPE_FIELDS (storage_type));
1993 tree storage_ptr_type = build_pointer_type (storage_type);
1995 tree template_cons = NULL_TREE;
1997 size = SUBSTITUTE_PLACEHOLDER_IN_EXPR (TYPE_SIZE_UNIT (storage_type),
2000 /* If the size overflows, pass -1 so the allocator will raise
2002 if (TREE_CODE (size) == INTEGER_CST && TREE_OVERFLOW (size))
2003 size = ssize_int (-1);
2005 storage = build_call_alloc_dealloc (NULL_TREE, size,
2006 TYPE_ALIGN (storage_type),
2007 gnat_proc, gnat_pool, gnat_node);
2008 storage = convert (storage_ptr_type, protect_multiple_eval (storage));
2010 if (TREE_CODE (type) == RECORD_TYPE && TYPE_IS_PADDING_P (type))
2012 type = TREE_TYPE (TYPE_FIELDS (type));
2015 init = convert (type, init);
2018 /* If there is an initializing expression, make a constructor for
2019 the entire object including the bounds and copy it into the
2020 object. If there is no initializing expression, just set the
2024 template_cons = tree_cons (TREE_CHAIN (TYPE_FIELDS (storage_type)),
2026 template_cons = tree_cons (TYPE_FIELDS (storage_type),
2027 build_template (template_type, type,
2033 build2 (COMPOUND_EXPR, storage_ptr_type,
2035 (MODIFY_EXPR, storage_type,
2036 build_unary_op (INDIRECT_REF, NULL_TREE,
2037 convert (storage_ptr_type, storage)),
2038 gnat_build_constructor (storage_type, template_cons)),
2039 convert (storage_ptr_type, storage)));
2043 (COMPOUND_EXPR, result_type,
2045 (MODIFY_EXPR, template_type,
2047 (build_unary_op (INDIRECT_REF, NULL_TREE,
2048 convert (storage_ptr_type, storage)),
2049 NULL_TREE, TYPE_FIELDS (storage_type), 0),
2050 build_template (template_type, type, NULL_TREE)),
2051 convert (result_type, convert (storage_ptr_type, storage)));
2054 /* If we have an initializing expression, see if its size is simpler
2055 than the size from the type. */
2056 if (!ignore_init_type && init && TYPE_SIZE_UNIT (TREE_TYPE (init))
2057 && (TREE_CODE (TYPE_SIZE_UNIT (TREE_TYPE (init))) == INTEGER_CST
2058 || CONTAINS_PLACEHOLDER_P (size)))
2059 size = TYPE_SIZE_UNIT (TREE_TYPE (init));
2061 /* If the size is still self-referential, reference the initializing
2062 expression, if it is present. If not, this must have been a
2063 call to allocate a library-level object, in which case we use
2064 the maximum size. */
2065 if (CONTAINS_PLACEHOLDER_P (size))
2067 if (!ignore_init_type && init)
2068 size = substitute_placeholder_in_expr (size, init);
2070 size = max_size (size, true);
2073 /* If the size overflows, pass -1 so the allocator will raise
2075 if (TREE_CODE (size) == INTEGER_CST && TREE_OVERFLOW (size))
2076 size = ssize_int (-1);
2078 /* If this is in the default storage pool and the type alignment is larger
2079 than what the default allocator supports, make an "aligning" record type
2080 with room to store a pointer before the field, allocate an object of that
2081 type, store the system's allocator return value just in front of the
2082 field and return the field's address. */
2084 if (No (gnat_proc) && TYPE_ALIGN (type) > default_allocator_alignment)
2086 /* Construct the aligning type with enough room for a pointer ahead
2087 of the field, then allocate. */
2089 = make_aligning_type (type, TYPE_ALIGN (type), size,
2090 default_allocator_alignment,
2091 POINTER_SIZE / BITS_PER_UNIT);
2093 tree record, record_addr;
2096 = build_call_alloc_dealloc (NULL_TREE, TYPE_SIZE_UNIT (record_type),
2097 default_allocator_alignment, Empty, Empty,
2101 = convert (build_pointer_type (record_type),
2102 save_expr (record_addr));
2104 record = build_unary_op (INDIRECT_REF, NULL_TREE, record_addr);
2106 /* Our RESULT (the Ada allocator's value) is the super-aligned address
2107 of the internal record field ... */
2109 = build_unary_op (ADDR_EXPR, NULL_TREE,
2111 (record, NULL_TREE, TYPE_FIELDS (record_type), 0));
2112 result = convert (result_type, result);
2114 /* ... with the system allocator's return value stored just in
2118 = build_binary_op (POINTER_PLUS_EXPR, ptr_void_type_node,
2119 convert (ptr_void_type_node, result),
2120 size_int (-POINTER_SIZE/BITS_PER_UNIT));
2123 = convert (build_pointer_type (ptr_void_type_node), ptr_addr);
2126 = build2 (COMPOUND_EXPR, TREE_TYPE (result),
2127 build_binary_op (MODIFY_EXPR, NULL_TREE,
2128 build_unary_op (INDIRECT_REF, NULL_TREE,
2130 convert (ptr_void_type_node,
2136 result = convert (result_type,
2137 build_call_alloc_dealloc (NULL_TREE, size,
2143 /* If we have an initial value, put the new address into a SAVE_EXPR, assign
2144 the value, and return the address. Do this with a COMPOUND_EXPR. */
2148 result = save_expr (result);
2150 = build2 (COMPOUND_EXPR, TREE_TYPE (result),
2152 (MODIFY_EXPR, NULL_TREE,
2153 build_unary_op (INDIRECT_REF,
2154 TREE_TYPE (TREE_TYPE (result)), result),
2159 return convert (result_type, result);
2162 /* Fill in a VMS descriptor for EXPR and return a constructor for it.
2163 GNAT_FORMAL is how we find the descriptor record. GNAT_ACTUAL is
2164 how we derive the source location to raise C_E on an out of range
2168 fill_vms_descriptor (tree expr, Entity_Id gnat_formal, Node_Id gnat_actual)
2171 tree parm_decl = get_gnu_tree (gnat_formal);
2172 tree const_list = NULL_TREE;
2173 tree record_type = TREE_TYPE (TREE_TYPE (parm_decl));
2174 int do_range_check =
2176 IDENTIFIER_POINTER (DECL_NAME (TYPE_FIELDS (record_type))));
2178 expr = maybe_unconstrained_array (expr);
2179 gnat_mark_addressable (expr);
2181 for (field = TYPE_FIELDS (record_type); field; field = TREE_CHAIN (field))
2183 tree conexpr = convert (TREE_TYPE (field),
2184 SUBSTITUTE_PLACEHOLDER_IN_EXPR
2185 (DECL_INITIAL (field), expr));
2187 /* Check to ensure that only 32bit pointers are passed in
2188 32bit descriptors */
2189 if (do_range_check &&
2190 strcmp (IDENTIFIER_POINTER (DECL_NAME (field)), "POINTER") == 0)
2192 tree pointer64type =
2193 build_pointer_type_for_mode (void_type_node, DImode, false);
2194 tree addr64expr = build_unary_op (ADDR_EXPR, pointer64type, expr);
2196 build_int_cstu (long_integer_type_node, 0x80000000);
2198 add_stmt (build3 (COND_EXPR, void_type_node,
2199 build_binary_op (GE_EXPR, long_integer_type_node,
2200 convert (long_integer_type_node,
2203 build_call_raise (CE_Range_Check_Failed, gnat_actual,
2204 N_Raise_Constraint_Error),
2207 const_list = tree_cons (field, conexpr, const_list);
2210 return gnat_build_constructor (record_type, nreverse (const_list));
2213 /* Indicate that we need to make the address of EXPR_NODE and it therefore
2214 should not be allocated in a register. Returns true if successful. */
2217 gnat_mark_addressable (tree expr_node)
2220 switch (TREE_CODE (expr_node))
2225 case ARRAY_RANGE_REF:
2228 case VIEW_CONVERT_EXPR:
2229 case NON_LVALUE_EXPR:
2231 expr_node = TREE_OPERAND (expr_node, 0);
2235 TREE_ADDRESSABLE (expr_node) = 1;
2241 TREE_ADDRESSABLE (expr_node) = 1;
2245 TREE_ADDRESSABLE (expr_node) = 1;
2249 return (DECL_CONST_CORRESPONDING_VAR (expr_node)
2250 && (gnat_mark_addressable
2251 (DECL_CONST_CORRESPONDING_VAR (expr_node))));