1 /* Expression translation
2 Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008 Free Software
4 Contributed by Paul Brook <paul@nowt.org>
5 and Steven Bosscher <s.bosscher@student.tudelft.nl>
7 This file is part of GCC.
9 GCC is free software; you can redistribute it and/or modify it under
10 the terms of the GNU General Public License as published by the Free
11 Software Foundation; either version 3, or (at your option) any later
14 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
15 WARRANTY; without even the implied warranty of MERCHANTABILITY or
16 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
19 You should have received a copy of the GNU General Public License
20 along with GCC; see the file COPYING3. If not see
21 <http://www.gnu.org/licenses/>. */
23 /* trans-expr.c-- generate GENERIC trees for gfc_expr. */
27 #include "coretypes.h"
33 #include "tree-gimple.h"
34 #include "langhooks.h"
39 #include "trans-const.h"
40 #include "trans-types.h"
41 #include "trans-array.h"
42 /* Only for gfc_trans_assign and gfc_trans_pointer_assign. */
43 #include "trans-stmt.h"
44 #include "dependency.h"
46 static tree gfc_trans_structure_assign (tree dest, gfc_expr * expr);
47 static void gfc_apply_interface_mapping_to_expr (gfc_interface_mapping *,
50 /* Copy the scalarization loop variables. */
53 gfc_copy_se_loopvars (gfc_se * dest, gfc_se * src)
56 dest->loop = src->loop;
60 /* Initialize a simple expression holder.
62 Care must be taken when multiple se are created with the same parent.
63 The child se must be kept in sync. The easiest way is to delay creation
64 of a child se until after after the previous se has been translated. */
67 gfc_init_se (gfc_se * se, gfc_se * parent)
69 memset (se, 0, sizeof (gfc_se));
70 gfc_init_block (&se->pre);
71 gfc_init_block (&se->post);
76 gfc_copy_se_loopvars (se, parent);
80 /* Advances to the next SS in the chain. Use this rather than setting
81 se->ss = se->ss->next because all the parents needs to be kept in sync.
85 gfc_advance_se_ss_chain (gfc_se * se)
89 gcc_assert (se != NULL && se->ss != NULL && se->ss != gfc_ss_terminator);
92 /* Walk down the parent chain. */
95 /* Simple consistency check. */
96 gcc_assert (p->parent == NULL || p->parent->ss == p->ss);
105 /* Ensures the result of the expression as either a temporary variable
106 or a constant so that it can be used repeatedly. */
109 gfc_make_safe_expr (gfc_se * se)
113 if (CONSTANT_CLASS_P (se->expr))
116 /* We need a temporary for this result. */
117 var = gfc_create_var (TREE_TYPE (se->expr), NULL);
118 gfc_add_modify_expr (&se->pre, var, se->expr);
123 /* Return an expression which determines if a dummy parameter is present.
124 Also used for arguments to procedures with multiple entry points. */
127 gfc_conv_expr_present (gfc_symbol * sym)
131 gcc_assert (sym->attr.dummy);
133 decl = gfc_get_symbol_decl (sym);
134 if (TREE_CODE (decl) != PARM_DECL)
136 /* Array parameters use a temporary descriptor, we want the real
138 gcc_assert (GFC_DESCRIPTOR_TYPE_P (TREE_TYPE (decl))
139 || GFC_ARRAY_TYPE_P (TREE_TYPE (decl)));
140 decl = GFC_DECL_SAVED_DESCRIPTOR (decl);
142 return fold_build2 (NE_EXPR, boolean_type_node, decl,
143 fold_convert (TREE_TYPE (decl), null_pointer_node));
147 /* Converts a missing, dummy argument into a null or zero. */
150 gfc_conv_missing_dummy (gfc_se * se, gfc_expr * arg, gfc_typespec ts, int kind)
155 present = gfc_conv_expr_present (arg->symtree->n.sym);
159 /* Create a temporary and convert it to the correct type. */
160 tmp = gfc_get_int_type (kind);
161 tmp = fold_convert (tmp, build_fold_indirect_ref (se->expr));
163 /* Test for a NULL value. */
164 tmp = build3 (COND_EXPR, TREE_TYPE (tmp), present, tmp, integer_one_node);
165 tmp = gfc_evaluate_now (tmp, &se->pre);
166 se->expr = build_fold_addr_expr (tmp);
170 tmp = build3 (COND_EXPR, TREE_TYPE (se->expr), present, se->expr,
171 fold_convert (TREE_TYPE (se->expr), integer_zero_node));
172 tmp = gfc_evaluate_now (tmp, &se->pre);
176 if (ts.type == BT_CHARACTER)
178 tmp = build_int_cst (gfc_charlen_type_node, 0);
179 tmp = fold_build3 (COND_EXPR, gfc_charlen_type_node,
180 present, se->string_length, tmp);
181 tmp = gfc_evaluate_now (tmp, &se->pre);
182 se->string_length = tmp;
188 /* Get the character length of an expression, looking through gfc_refs
192 gfc_get_expr_charlen (gfc_expr *e)
197 gcc_assert (e->expr_type == EXPR_VARIABLE
198 && e->ts.type == BT_CHARACTER);
200 length = NULL; /* To silence compiler warning. */
202 if (is_subref_array (e) && e->ts.cl->length)
205 gfc_init_se (&tmpse, NULL);
206 gfc_conv_expr_type (&tmpse, e->ts.cl->length, gfc_charlen_type_node);
207 e->ts.cl->backend_decl = tmpse.expr;
211 /* First candidate: if the variable is of type CHARACTER, the
212 expression's length could be the length of the character
214 if (e->symtree->n.sym->ts.type == BT_CHARACTER)
215 length = e->symtree->n.sym->ts.cl->backend_decl;
217 /* Look through the reference chain for component references. */
218 for (r = e->ref; r; r = r->next)
223 if (r->u.c.component->ts.type == BT_CHARACTER)
224 length = r->u.c.component->ts.cl->backend_decl;
232 /* We should never got substring references here. These will be
233 broken down by the scalarizer. */
239 gcc_assert (length != NULL);
245 /* Generate code to initialize a string length variable. Returns the
249 gfc_conv_string_length (gfc_charlen * cl, stmtblock_t * pblock)
253 gfc_init_se (&se, NULL);
254 gfc_conv_expr_type (&se, cl->length, gfc_charlen_type_node);
255 se.expr = fold_build2 (MAX_EXPR, gfc_charlen_type_node, se.expr,
256 build_int_cst (gfc_charlen_type_node, 0));
257 gfc_add_block_to_block (pblock, &se.pre);
259 if (cl->backend_decl)
260 gfc_add_modify_expr (pblock, cl->backend_decl, se.expr);
262 cl->backend_decl = gfc_evaluate_now (se.expr, pblock);
267 gfc_conv_substring (gfc_se * se, gfc_ref * ref, int kind,
268 const char *name, locus *where)
278 type = gfc_get_character_type (kind, ref->u.ss.length);
279 type = build_pointer_type (type);
282 gfc_init_se (&start, se);
283 gfc_conv_expr_type (&start, ref->u.ss.start, gfc_charlen_type_node);
284 gfc_add_block_to_block (&se->pre, &start.pre);
286 if (integer_onep (start.expr))
287 gfc_conv_string_parameter (se);
290 /* Avoid multiple evaluation of substring start. */
291 if (!CONSTANT_CLASS_P (start.expr) && !DECL_P (start.expr))
292 start.expr = gfc_evaluate_now (start.expr, &se->pre);
294 /* Change the start of the string. */
295 if (TYPE_STRING_FLAG (TREE_TYPE (se->expr)))
298 tmp = build_fold_indirect_ref (se->expr);
299 tmp = gfc_build_array_ref (tmp, start.expr, NULL);
300 se->expr = gfc_build_addr_expr (type, tmp);
303 /* Length = end + 1 - start. */
304 gfc_init_se (&end, se);
305 if (ref->u.ss.end == NULL)
306 end.expr = se->string_length;
309 gfc_conv_expr_type (&end, ref->u.ss.end, gfc_charlen_type_node);
310 gfc_add_block_to_block (&se->pre, &end.pre);
312 if (!CONSTANT_CLASS_P (end.expr) && !DECL_P (end.expr))
313 end.expr = gfc_evaluate_now (end.expr, &se->pre);
315 if (flag_bounds_check)
317 tree nonempty = fold_build2 (LE_EXPR, boolean_type_node,
318 start.expr, end.expr);
320 /* Check lower bound. */
321 fault = fold_build2 (LT_EXPR, boolean_type_node, start.expr,
322 build_int_cst (gfc_charlen_type_node, 1));
323 fault = fold_build2 (TRUTH_ANDIF_EXPR, boolean_type_node,
326 asprintf (&msg, "Substring out of bounds: lower bound (%%ld) of '%s' "
327 "is less than one", name);
329 asprintf (&msg, "Substring out of bounds: lower bound (%%ld)"
331 gfc_trans_runtime_check (fault, &se->pre, where, msg,
332 fold_convert (long_integer_type_node,
336 /* Check upper bound. */
337 fault = fold_build2 (GT_EXPR, boolean_type_node, end.expr,
339 fault = fold_build2 (TRUTH_ANDIF_EXPR, boolean_type_node,
342 asprintf (&msg, "Substring out of bounds: upper bound (%%ld) of '%s' "
343 "exceeds string length (%%ld)", name);
345 asprintf (&msg, "Substring out of bounds: upper bound (%%ld) "
346 "exceeds string length (%%ld)");
347 gfc_trans_runtime_check (fault, &se->pre, where, msg,
348 fold_convert (long_integer_type_node, end.expr),
349 fold_convert (long_integer_type_node,
354 tmp = fold_build2 (MINUS_EXPR, gfc_charlen_type_node,
355 build_int_cst (gfc_charlen_type_node, 1),
357 tmp = fold_build2 (PLUS_EXPR, gfc_charlen_type_node, end.expr, tmp);
358 tmp = fold_build2 (MAX_EXPR, gfc_charlen_type_node, tmp,
359 build_int_cst (gfc_charlen_type_node, 0));
360 se->string_length = tmp;
364 /* Convert a derived type component reference. */
367 gfc_conv_component_ref (gfc_se * se, gfc_ref * ref)
374 c = ref->u.c.component;
376 gcc_assert (c->backend_decl);
378 field = c->backend_decl;
379 gcc_assert (TREE_CODE (field) == FIELD_DECL);
381 tmp = fold_build3 (COMPONENT_REF, TREE_TYPE (field), decl, field, NULL_TREE);
385 if (c->ts.type == BT_CHARACTER)
387 tmp = c->ts.cl->backend_decl;
388 /* Components must always be constant length. */
389 gcc_assert (tmp && INTEGER_CST_P (tmp));
390 se->string_length = tmp;
393 if (c->pointer && c->dimension == 0 && c->ts.type != BT_CHARACTER)
394 se->expr = build_fold_indirect_ref (se->expr);
398 /* Return the contents of a variable. Also handles reference/pointer
399 variables (all Fortran pointer references are implicit). */
402 gfc_conv_variable (gfc_se * se, gfc_expr * expr)
409 bool alternate_entry;
412 sym = expr->symtree->n.sym;
415 /* Check that something hasn't gone horribly wrong. */
416 gcc_assert (se->ss != gfc_ss_terminator);
417 gcc_assert (se->ss->expr == expr);
419 /* A scalarized term. We already know the descriptor. */
420 se->expr = se->ss->data.info.descriptor;
421 se->string_length = se->ss->string_length;
422 for (ref = se->ss->data.info.ref; ref; ref = ref->next)
423 if (ref->type == REF_ARRAY && ref->u.ar.type != AR_ELEMENT)
428 tree se_expr = NULL_TREE;
430 se->expr = gfc_get_symbol_decl (sym);
432 /* Deal with references to a parent results or entries by storing
433 the current_function_decl and moving to the parent_decl. */
434 return_value = sym->attr.function && sym->result == sym;
435 alternate_entry = sym->attr.function && sym->attr.entry
436 && sym->result == sym;
437 entry_master = sym->attr.result
438 && sym->ns->proc_name->attr.entry_master
439 && !gfc_return_by_reference (sym->ns->proc_name);
440 parent_decl = DECL_CONTEXT (current_function_decl);
442 if ((se->expr == parent_decl && return_value)
443 || (sym->ns && sym->ns->proc_name
445 && sym->ns->proc_name->backend_decl == parent_decl
446 && (alternate_entry || entry_master)))
451 /* Special case for assigning the return value of a function.
452 Self recursive functions must have an explicit return value. */
453 if (return_value && (se->expr == current_function_decl || parent_flag))
454 se_expr = gfc_get_fake_result_decl (sym, parent_flag);
456 /* Similarly for alternate entry points. */
457 else if (alternate_entry
458 && (sym->ns->proc_name->backend_decl == current_function_decl
461 gfc_entry_list *el = NULL;
463 for (el = sym->ns->entries; el; el = el->next)
466 se_expr = gfc_get_fake_result_decl (sym, parent_flag);
471 else if (entry_master
472 && (sym->ns->proc_name->backend_decl == current_function_decl
474 se_expr = gfc_get_fake_result_decl (sym, parent_flag);
479 /* Procedure actual arguments. */
480 else if (sym->attr.flavor == FL_PROCEDURE
481 && se->expr != current_function_decl)
483 gcc_assert (se->want_pointer);
484 if (!sym->attr.dummy)
486 gcc_assert (TREE_CODE (se->expr) == FUNCTION_DECL);
487 se->expr = build_fold_addr_expr (se->expr);
493 /* Dereference the expression, where needed. Since characters
494 are entirely different from other types, they are treated
496 if (sym->ts.type == BT_CHARACTER)
498 /* Dereference character pointer dummy arguments
500 if ((sym->attr.pointer || sym->attr.allocatable)
502 || sym->attr.function
503 || sym->attr.result))
504 se->expr = build_fold_indirect_ref (se->expr);
507 else if (!sym->attr.value)
509 /* Dereference non-character scalar dummy arguments. */
510 if (sym->attr.dummy && !sym->attr.dimension)
511 se->expr = build_fold_indirect_ref (se->expr);
513 /* Dereference scalar hidden result. */
514 if (gfc_option.flag_f2c && sym->ts.type == BT_COMPLEX
515 && (sym->attr.function || sym->attr.result)
516 && !sym->attr.dimension && !sym->attr.pointer)
517 se->expr = build_fold_indirect_ref (se->expr);
519 /* Dereference non-character pointer variables.
520 These must be dummies, results, or scalars. */
521 if ((sym->attr.pointer || sym->attr.allocatable)
523 || sym->attr.function
525 || !sym->attr.dimension))
526 se->expr = build_fold_indirect_ref (se->expr);
532 /* For character variables, also get the length. */
533 if (sym->ts.type == BT_CHARACTER)
535 /* If the character length of an entry isn't set, get the length from
536 the master function instead. */
537 if (sym->attr.entry && !sym->ts.cl->backend_decl)
538 se->string_length = sym->ns->proc_name->ts.cl->backend_decl;
540 se->string_length = sym->ts.cl->backend_decl;
541 gcc_assert (se->string_length);
549 /* Return the descriptor if that's what we want and this is an array
550 section reference. */
551 if (se->descriptor_only && ref->u.ar.type != AR_ELEMENT)
553 /* TODO: Pointers to single elements of array sections, eg elemental subs. */
554 /* Return the descriptor for array pointers and allocations. */
556 && ref->next == NULL && (se->descriptor_only))
559 gfc_conv_array_ref (se, &ref->u.ar, sym, &expr->where);
560 /* Return a pointer to an element. */
564 gfc_conv_component_ref (se, ref);
568 gfc_conv_substring (se, ref, expr->ts.kind,
569 expr->symtree->name, &expr->where);
578 /* Pointer assignment, allocation or pass by reference. Arrays are handled
580 if (se->want_pointer)
582 if (expr->ts.type == BT_CHARACTER)
583 gfc_conv_string_parameter (se);
585 se->expr = build_fold_addr_expr (se->expr);
590 /* Unary ops are easy... Or they would be if ! was a valid op. */
593 gfc_conv_unary_op (enum tree_code code, gfc_se * se, gfc_expr * expr)
598 gcc_assert (expr->ts.type != BT_CHARACTER);
599 /* Initialize the operand. */
600 gfc_init_se (&operand, se);
601 gfc_conv_expr_val (&operand, expr->value.op.op1);
602 gfc_add_block_to_block (&se->pre, &operand.pre);
604 type = gfc_typenode_for_spec (&expr->ts);
606 /* TRUTH_NOT_EXPR is not a "true" unary operator in GCC.
607 We must convert it to a compare to 0 (e.g. EQ_EXPR (op1, 0)).
608 All other unary operators have an equivalent GIMPLE unary operator. */
609 if (code == TRUTH_NOT_EXPR)
610 se->expr = fold_build2 (EQ_EXPR, type, operand.expr,
611 build_int_cst (type, 0));
613 se->expr = fold_build1 (code, type, operand.expr);
617 /* Expand power operator to optimal multiplications when a value is raised
618 to a constant integer n. See section 4.6.3, "Evaluation of Powers" of
619 Donald E. Knuth, "Seminumerical Algorithms", Vol. 2, "The Art of Computer
620 Programming", 3rd Edition, 1998. */
622 /* This code is mostly duplicated from expand_powi in the backend.
623 We establish the "optimal power tree" lookup table with the defined size.
624 The items in the table are the exponents used to calculate the index
625 exponents. Any integer n less than the value can get an "addition chain",
626 with the first node being one. */
627 #define POWI_TABLE_SIZE 256
629 /* The table is from builtins.c. */
630 static const unsigned char powi_table[POWI_TABLE_SIZE] =
632 0, 1, 1, 2, 2, 3, 3, 4, /* 0 - 7 */
633 4, 6, 5, 6, 6, 10, 7, 9, /* 8 - 15 */
634 8, 16, 9, 16, 10, 12, 11, 13, /* 16 - 23 */
635 12, 17, 13, 18, 14, 24, 15, 26, /* 24 - 31 */
636 16, 17, 17, 19, 18, 33, 19, 26, /* 32 - 39 */
637 20, 25, 21, 40, 22, 27, 23, 44, /* 40 - 47 */
638 24, 32, 25, 34, 26, 29, 27, 44, /* 48 - 55 */
639 28, 31, 29, 34, 30, 60, 31, 36, /* 56 - 63 */
640 32, 64, 33, 34, 34, 46, 35, 37, /* 64 - 71 */
641 36, 65, 37, 50, 38, 48, 39, 69, /* 72 - 79 */
642 40, 49, 41, 43, 42, 51, 43, 58, /* 80 - 87 */
643 44, 64, 45, 47, 46, 59, 47, 76, /* 88 - 95 */
644 48, 65, 49, 66, 50, 67, 51, 66, /* 96 - 103 */
645 52, 70, 53, 74, 54, 104, 55, 74, /* 104 - 111 */
646 56, 64, 57, 69, 58, 78, 59, 68, /* 112 - 119 */
647 60, 61, 61, 80, 62, 75, 63, 68, /* 120 - 127 */
648 64, 65, 65, 128, 66, 129, 67, 90, /* 128 - 135 */
649 68, 73, 69, 131, 70, 94, 71, 88, /* 136 - 143 */
650 72, 128, 73, 98, 74, 132, 75, 121, /* 144 - 151 */
651 76, 102, 77, 124, 78, 132, 79, 106, /* 152 - 159 */
652 80, 97, 81, 160, 82, 99, 83, 134, /* 160 - 167 */
653 84, 86, 85, 95, 86, 160, 87, 100, /* 168 - 175 */
654 88, 113, 89, 98, 90, 107, 91, 122, /* 176 - 183 */
655 92, 111, 93, 102, 94, 126, 95, 150, /* 184 - 191 */
656 96, 128, 97, 130, 98, 133, 99, 195, /* 192 - 199 */
657 100, 128, 101, 123, 102, 164, 103, 138, /* 200 - 207 */
658 104, 145, 105, 146, 106, 109, 107, 149, /* 208 - 215 */
659 108, 200, 109, 146, 110, 170, 111, 157, /* 216 - 223 */
660 112, 128, 113, 130, 114, 182, 115, 132, /* 224 - 231 */
661 116, 200, 117, 132, 118, 158, 119, 206, /* 232 - 239 */
662 120, 240, 121, 162, 122, 147, 123, 152, /* 240 - 247 */
663 124, 166, 125, 214, 126, 138, 127, 153, /* 248 - 255 */
666 /* If n is larger than lookup table's max index, we use the "window
668 #define POWI_WINDOW_SIZE 3
670 /* Recursive function to expand the power operator. The temporary
671 values are put in tmpvar. The function returns tmpvar[1] ** n. */
673 gfc_conv_powi (gfc_se * se, unsigned HOST_WIDE_INT n, tree * tmpvar)
680 if (n < POWI_TABLE_SIZE)
685 op0 = gfc_conv_powi (se, n - powi_table[n], tmpvar);
686 op1 = gfc_conv_powi (se, powi_table[n], tmpvar);
690 digit = n & ((1 << POWI_WINDOW_SIZE) - 1);
691 op0 = gfc_conv_powi (se, n - digit, tmpvar);
692 op1 = gfc_conv_powi (se, digit, tmpvar);
696 op0 = gfc_conv_powi (se, n >> 1, tmpvar);
700 tmp = fold_build2 (MULT_EXPR, TREE_TYPE (op0), op0, op1);
701 tmp = gfc_evaluate_now (tmp, &se->pre);
703 if (n < POWI_TABLE_SIZE)
710 /* Expand lhs ** rhs. rhs is a constant integer. If it expands successfully,
711 return 1. Else return 0 and a call to runtime library functions
712 will have to be built. */
714 gfc_conv_cst_int_power (gfc_se * se, tree lhs, tree rhs)
719 tree vartmp[POWI_TABLE_SIZE];
721 unsigned HOST_WIDE_INT n;
724 /* If exponent is too large, we won't expand it anyway, so don't bother
725 with large integer values. */
726 if (!double_int_fits_in_shwi_p (TREE_INT_CST (rhs)))
729 m = double_int_to_shwi (TREE_INT_CST (rhs));
730 /* There's no ABS for HOST_WIDE_INT, so here we go. It also takes care
731 of the asymmetric range of the integer type. */
732 n = (unsigned HOST_WIDE_INT) (m < 0 ? -m : m);
734 type = TREE_TYPE (lhs);
735 sgn = tree_int_cst_sgn (rhs);
737 if (((FLOAT_TYPE_P (type) && !flag_unsafe_math_optimizations)
738 || optimize_size) && (m > 2 || m < -1))
744 se->expr = gfc_build_const (type, integer_one_node);
748 /* If rhs < 0 and lhs is an integer, the result is -1, 0 or 1. */
749 if ((sgn == -1) && (TREE_CODE (type) == INTEGER_TYPE))
751 tmp = fold_build2 (EQ_EXPR, boolean_type_node,
752 lhs, build_int_cst (TREE_TYPE (lhs), -1));
753 cond = fold_build2 (EQ_EXPR, boolean_type_node,
754 lhs, build_int_cst (TREE_TYPE (lhs), 1));
757 result = (lhs == 1 || lhs == -1) ? 1 : 0. */
760 tmp = fold_build2 (TRUTH_OR_EXPR, boolean_type_node, tmp, cond);
761 se->expr = fold_build3 (COND_EXPR, type,
762 tmp, build_int_cst (type, 1),
763 build_int_cst (type, 0));
767 result = (lhs == 1) ? 1 : (lhs == -1) ? -1 : 0. */
768 tmp = fold_build3 (COND_EXPR, type, tmp, build_int_cst (type, -1),
769 build_int_cst (type, 0));
770 se->expr = fold_build3 (COND_EXPR, type,
771 cond, build_int_cst (type, 1), tmp);
775 memset (vartmp, 0, sizeof (vartmp));
779 tmp = gfc_build_const (type, integer_one_node);
780 vartmp[1] = fold_build2 (RDIV_EXPR, type, tmp, vartmp[1]);
783 se->expr = gfc_conv_powi (se, n, vartmp);
789 /* Power op (**). Constant integer exponent has special handling. */
792 gfc_conv_power_op (gfc_se * se, gfc_expr * expr)
794 tree gfc_int4_type_node;
801 gfc_init_se (&lse, se);
802 gfc_conv_expr_val (&lse, expr->value.op.op1);
803 lse.expr = gfc_evaluate_now (lse.expr, &lse.pre);
804 gfc_add_block_to_block (&se->pre, &lse.pre);
806 gfc_init_se (&rse, se);
807 gfc_conv_expr_val (&rse, expr->value.op.op2);
808 gfc_add_block_to_block (&se->pre, &rse.pre);
810 if (expr->value.op.op2->ts.type == BT_INTEGER
811 && expr->value.op.op2->expr_type == EXPR_CONSTANT)
812 if (gfc_conv_cst_int_power (se, lse.expr, rse.expr))
815 gfc_int4_type_node = gfc_get_int_type (4);
817 kind = expr->value.op.op1->ts.kind;
818 switch (expr->value.op.op2->ts.type)
821 ikind = expr->value.op.op2->ts.kind;
826 rse.expr = convert (gfc_int4_type_node, rse.expr);
848 if (expr->value.op.op1->ts.type == BT_INTEGER)
849 lse.expr = convert (gfc_int4_type_node, lse.expr);
874 switch (expr->value.op.op1->ts.type)
877 if (kind == 3) /* Case 16 was not handled properly above. */
879 fndecl = gfor_fndecl_math_powi[kind][ikind].integer;
883 /* Use builtins for real ** int4. */
889 fndecl = built_in_decls[BUILT_IN_POWIF];
893 fndecl = built_in_decls[BUILT_IN_POWI];
898 fndecl = built_in_decls[BUILT_IN_POWIL];
906 fndecl = gfor_fndecl_math_powi[kind][ikind].real;
910 fndecl = gfor_fndecl_math_powi[kind][ikind].cmplx;
922 fndecl = built_in_decls[BUILT_IN_POWF];
925 fndecl = built_in_decls[BUILT_IN_POW];
929 fndecl = built_in_decls[BUILT_IN_POWL];
940 fndecl = built_in_decls[BUILT_IN_CPOWF];
943 fndecl = built_in_decls[BUILT_IN_CPOW];
947 fndecl = built_in_decls[BUILT_IN_CPOWL];
959 se->expr = build_call_expr (fndecl, 2, lse.expr, rse.expr);
963 /* Generate code to allocate a string temporary. */
966 gfc_conv_string_tmp (gfc_se * se, tree type, tree len)
971 gcc_assert (TREE_TYPE (len) == gfc_charlen_type_node);
973 if (gfc_can_put_var_on_stack (len))
975 /* Create a temporary variable to hold the result. */
976 tmp = fold_build2 (MINUS_EXPR, gfc_charlen_type_node, len,
977 build_int_cst (gfc_charlen_type_node, 1));
978 tmp = build_range_type (gfc_array_index_type, gfc_index_zero_node, tmp);
979 tmp = build_array_type (gfc_character1_type_node, tmp);
980 var = gfc_create_var (tmp, "str");
981 var = gfc_build_addr_expr (type, var);
985 /* Allocate a temporary to hold the result. */
986 var = gfc_create_var (type, "pstr");
987 tmp = gfc_call_malloc (&se->pre, type, len);
988 gfc_add_modify_expr (&se->pre, var, tmp);
990 /* Free the temporary afterwards. */
991 tmp = gfc_call_free (convert (pvoid_type_node, var));
992 gfc_add_expr_to_block (&se->post, tmp);
999 /* Handle a string concatenation operation. A temporary will be allocated to
1003 gfc_conv_concat_op (gfc_se * se, gfc_expr * expr)
1012 gcc_assert (expr->value.op.op1->ts.type == BT_CHARACTER
1013 && expr->value.op.op2->ts.type == BT_CHARACTER);
1015 gfc_init_se (&lse, se);
1016 gfc_conv_expr (&lse, expr->value.op.op1);
1017 gfc_conv_string_parameter (&lse);
1018 gfc_init_se (&rse, se);
1019 gfc_conv_expr (&rse, expr->value.op.op2);
1020 gfc_conv_string_parameter (&rse);
1022 gfc_add_block_to_block (&se->pre, &lse.pre);
1023 gfc_add_block_to_block (&se->pre, &rse.pre);
1025 type = gfc_get_character_type (expr->ts.kind, expr->ts.cl);
1026 len = TYPE_MAX_VALUE (TYPE_DOMAIN (type));
1027 if (len == NULL_TREE)
1029 len = fold_build2 (PLUS_EXPR, TREE_TYPE (lse.string_length),
1030 lse.string_length, rse.string_length);
1033 type = build_pointer_type (type);
1035 var = gfc_conv_string_tmp (se, type, len);
1037 /* Do the actual concatenation. */
1038 tmp = build_call_expr (gfor_fndecl_concat_string, 6,
1040 lse.string_length, lse.expr,
1041 rse.string_length, rse.expr);
1042 gfc_add_expr_to_block (&se->pre, tmp);
1044 /* Add the cleanup for the operands. */
1045 gfc_add_block_to_block (&se->pre, &rse.post);
1046 gfc_add_block_to_block (&se->pre, &lse.post);
1049 se->string_length = len;
1052 /* Translates an op expression. Common (binary) cases are handled by this
1053 function, others are passed on. Recursion is used in either case.
1054 We use the fact that (op1.ts == op2.ts) (except for the power
1056 Operators need no special handling for scalarized expressions as long as
1057 they call gfc_conv_simple_val to get their operands.
1058 Character strings get special handling. */
1061 gfc_conv_expr_op (gfc_se * se, gfc_expr * expr)
1063 enum tree_code code;
1072 switch (expr->value.op.operator)
1074 case INTRINSIC_PARENTHESES:
1075 if (expr->ts.type == BT_REAL
1076 || expr->ts.type == BT_COMPLEX)
1078 gfc_conv_unary_op (PAREN_EXPR, se, expr);
1079 gcc_assert (FLOAT_TYPE_P (TREE_TYPE (se->expr)));
1084 case INTRINSIC_UPLUS:
1085 gfc_conv_expr (se, expr->value.op.op1);
1088 case INTRINSIC_UMINUS:
1089 gfc_conv_unary_op (NEGATE_EXPR, se, expr);
1093 gfc_conv_unary_op (TRUTH_NOT_EXPR, se, expr);
1096 case INTRINSIC_PLUS:
1100 case INTRINSIC_MINUS:
1104 case INTRINSIC_TIMES:
1108 case INTRINSIC_DIVIDE:
1109 /* If expr is a real or complex expr, use an RDIV_EXPR. If op1 is
1110 an integer, we must round towards zero, so we use a
1112 if (expr->ts.type == BT_INTEGER)
1113 code = TRUNC_DIV_EXPR;
1118 case INTRINSIC_POWER:
1119 gfc_conv_power_op (se, expr);
1122 case INTRINSIC_CONCAT:
1123 gfc_conv_concat_op (se, expr);
1127 code = TRUTH_ANDIF_EXPR;
1132 code = TRUTH_ORIF_EXPR;
1136 /* EQV and NEQV only work on logicals, but since we represent them
1137 as integers, we can use EQ_EXPR and NE_EXPR for them in GIMPLE. */
1139 case INTRINSIC_EQ_OS:
1147 case INTRINSIC_NE_OS:
1148 case INTRINSIC_NEQV:
1155 case INTRINSIC_GT_OS:
1162 case INTRINSIC_GE_OS:
1169 case INTRINSIC_LT_OS:
1176 case INTRINSIC_LE_OS:
1182 case INTRINSIC_USER:
1183 case INTRINSIC_ASSIGN:
1184 /* These should be converted into function calls by the frontend. */
1188 fatal_error ("Unknown intrinsic op");
1192 /* The only exception to this is **, which is handled separately anyway. */
1193 gcc_assert (expr->value.op.op1->ts.type == expr->value.op.op2->ts.type);
1195 if (checkstring && expr->value.op.op1->ts.type != BT_CHARACTER)
1199 gfc_init_se (&lse, se);
1200 gfc_conv_expr (&lse, expr->value.op.op1);
1201 gfc_add_block_to_block (&se->pre, &lse.pre);
1204 gfc_init_se (&rse, se);
1205 gfc_conv_expr (&rse, expr->value.op.op2);
1206 gfc_add_block_to_block (&se->pre, &rse.pre);
1210 gfc_conv_string_parameter (&lse);
1211 gfc_conv_string_parameter (&rse);
1213 lse.expr = gfc_build_compare_string (lse.string_length, lse.expr,
1214 rse.string_length, rse.expr);
1215 rse.expr = build_int_cst (TREE_TYPE (lse.expr), 0);
1216 gfc_add_block_to_block (&lse.post, &rse.post);
1219 type = gfc_typenode_for_spec (&expr->ts);
1223 /* The result of logical ops is always boolean_type_node. */
1224 tmp = fold_build2 (code, boolean_type_node, lse.expr, rse.expr);
1225 se->expr = convert (type, tmp);
1228 se->expr = fold_build2 (code, type, lse.expr, rse.expr);
1230 /* Add the post blocks. */
1231 gfc_add_block_to_block (&se->post, &rse.post);
1232 gfc_add_block_to_block (&se->post, &lse.post);
1235 /* If a string's length is one, we convert it to a single character. */
1238 gfc_to_single_character (tree len, tree str)
1240 gcc_assert (POINTER_TYPE_P (TREE_TYPE (str)));
1242 if (INTEGER_CST_P (len) && TREE_INT_CST_LOW (len) == 1
1243 && TREE_INT_CST_HIGH (len) == 0)
1245 str = fold_convert (pchar_type_node, str);
1246 return build_fold_indirect_ref (str);
1254 gfc_conv_scalar_char_value (gfc_symbol *sym, gfc_se *se, gfc_expr **expr)
1257 if (sym->backend_decl)
1259 /* This becomes the nominal_type in
1260 function.c:assign_parm_find_data_types. */
1261 TREE_TYPE (sym->backend_decl) = unsigned_char_type_node;
1262 /* This becomes the passed_type in
1263 function.c:assign_parm_find_data_types. C promotes char to
1264 integer for argument passing. */
1265 DECL_ARG_TYPE (sym->backend_decl) = unsigned_type_node;
1267 DECL_BY_REFERENCE (sym->backend_decl) = 0;
1272 /* If we have a constant character expression, make it into an
1274 if ((*expr)->expr_type == EXPR_CONSTANT)
1278 *expr = gfc_int_expr ((int)(*expr)->value.character.string[0]);
1279 if ((*expr)->ts.kind != gfc_c_int_kind)
1281 /* The expr needs to be compatible with a C int. If the
1282 conversion fails, then the 2 causes an ICE. */
1283 ts.type = BT_INTEGER;
1284 ts.kind = gfc_c_int_kind;
1285 gfc_convert_type (*expr, &ts, 2);
1288 else if (se != NULL && (*expr)->expr_type == EXPR_VARIABLE)
1290 if ((*expr)->ref == NULL)
1292 se->expr = gfc_to_single_character
1293 (build_int_cst (integer_type_node, 1),
1294 gfc_build_addr_expr (pchar_type_node,
1296 ((*expr)->symtree->n.sym)));
1300 gfc_conv_variable (se, *expr);
1301 se->expr = gfc_to_single_character
1302 (build_int_cst (integer_type_node, 1),
1303 gfc_build_addr_expr (pchar_type_node, se->expr));
1310 /* Compare two strings. If they are all single characters, the result is the
1311 subtraction of them. Otherwise, we build a library call. */
1314 gfc_build_compare_string (tree len1, tree str1, tree len2, tree str2)
1320 gcc_assert (POINTER_TYPE_P (TREE_TYPE (str1)));
1321 gcc_assert (POINTER_TYPE_P (TREE_TYPE (str2)));
1323 sc1 = gfc_to_single_character (len1, str1);
1324 sc2 = gfc_to_single_character (len2, str2);
1326 /* Deal with single character specially. */
1327 if (sc1 != NULL_TREE && sc2 != NULL_TREE)
1329 sc1 = fold_convert (integer_type_node, sc1);
1330 sc2 = fold_convert (integer_type_node, sc2);
1331 tmp = fold_build2 (MINUS_EXPR, integer_type_node, sc1, sc2);
1334 /* Build a call for the comparison. */
1335 tmp = build_call_expr (gfor_fndecl_compare_string, 4,
1336 len1, str1, len2, str2);
1341 gfc_conv_function_val (gfc_se * se, gfc_symbol * sym)
1345 if (sym->attr.dummy)
1347 tmp = gfc_get_symbol_decl (sym);
1348 gcc_assert (TREE_CODE (TREE_TYPE (tmp)) == POINTER_TYPE
1349 && TREE_CODE (TREE_TYPE (TREE_TYPE (tmp))) == FUNCTION_TYPE);
1353 if (!sym->backend_decl)
1354 sym->backend_decl = gfc_get_extern_function_decl (sym);
1356 tmp = sym->backend_decl;
1357 if (sym->attr.cray_pointee)
1358 tmp = convert (build_pointer_type (TREE_TYPE (tmp)),
1359 gfc_get_symbol_decl (sym->cp_pointer));
1360 if (!POINTER_TYPE_P (TREE_TYPE (tmp)))
1362 gcc_assert (TREE_CODE (tmp) == FUNCTION_DECL);
1363 tmp = build_fold_addr_expr (tmp);
1370 /* Translate the call for an elemental subroutine call used in an operator
1371 assignment. This is a simplified version of gfc_conv_function_call. */
1374 gfc_conv_operator_assign (gfc_se *lse, gfc_se *rse, gfc_symbol *sym)
1381 /* Only elemental subroutines with two arguments. */
1382 gcc_assert (sym->attr.elemental && sym->attr.subroutine);
1383 gcc_assert (sym->formal->next->next == NULL);
1385 gfc_init_block (&block);
1387 gfc_add_block_to_block (&block, &lse->pre);
1388 gfc_add_block_to_block (&block, &rse->pre);
1390 /* Build the argument list for the call, including hidden string lengths. */
1391 args = gfc_chainon_list (NULL_TREE, build_fold_addr_expr (lse->expr));
1392 args = gfc_chainon_list (args, build_fold_addr_expr (rse->expr));
1393 if (lse->string_length != NULL_TREE)
1394 args = gfc_chainon_list (args, lse->string_length);
1395 if (rse->string_length != NULL_TREE)
1396 args = gfc_chainon_list (args, rse->string_length);
1398 /* Build the function call. */
1399 gfc_init_se (&se, NULL);
1400 gfc_conv_function_val (&se, sym);
1401 tmp = TREE_TYPE (TREE_TYPE (TREE_TYPE (se.expr)));
1402 tmp = build_call_list (tmp, se.expr, args);
1403 gfc_add_expr_to_block (&block, tmp);
1405 gfc_add_block_to_block (&block, &lse->post);
1406 gfc_add_block_to_block (&block, &rse->post);
1408 return gfc_finish_block (&block);
1412 /* Initialize MAPPING. */
1415 gfc_init_interface_mapping (gfc_interface_mapping * mapping)
1417 mapping->syms = NULL;
1418 mapping->charlens = NULL;
1422 /* Free all memory held by MAPPING (but not MAPPING itself). */
1425 gfc_free_interface_mapping (gfc_interface_mapping * mapping)
1427 gfc_interface_sym_mapping *sym;
1428 gfc_interface_sym_mapping *nextsym;
1430 gfc_charlen *nextcl;
1432 for (sym = mapping->syms; sym; sym = nextsym)
1434 nextsym = sym->next;
1435 gfc_free_symbol (sym->new->n.sym);
1436 gfc_free_expr (sym->expr);
1437 gfc_free (sym->new);
1440 for (cl = mapping->charlens; cl; cl = nextcl)
1443 gfc_free_expr (cl->length);
1449 /* Return a copy of gfc_charlen CL. Add the returned structure to
1450 MAPPING so that it will be freed by gfc_free_interface_mapping. */
1452 static gfc_charlen *
1453 gfc_get_interface_mapping_charlen (gfc_interface_mapping * mapping,
1458 new = gfc_get_charlen ();
1459 new->next = mapping->charlens;
1460 new->length = gfc_copy_expr (cl->length);
1462 mapping->charlens = new;
1467 /* A subroutine of gfc_add_interface_mapping. Return a descriptorless
1468 array variable that can be used as the actual argument for dummy
1469 argument SYM. Add any initialization code to BLOCK. PACKED is as
1470 for gfc_get_nodesc_array_type and DATA points to the first element
1471 in the passed array. */
1474 gfc_get_interface_mapping_array (stmtblock_t * block, gfc_symbol * sym,
1475 gfc_packed packed, tree data)
1480 type = gfc_typenode_for_spec (&sym->ts);
1481 type = gfc_get_nodesc_array_type (type, sym->as, packed);
1483 var = gfc_create_var (type, "ifm");
1484 gfc_add_modify_expr (block, var, fold_convert (type, data));
1490 /* A subroutine of gfc_add_interface_mapping. Set the stride, upper bounds
1491 and offset of descriptorless array type TYPE given that it has the same
1492 size as DESC. Add any set-up code to BLOCK. */
1495 gfc_set_interface_mapping_bounds (stmtblock_t * block, tree type, tree desc)
1502 offset = gfc_index_zero_node;
1503 for (n = 0; n < GFC_TYPE_ARRAY_RANK (type); n++)
1505 dim = gfc_rank_cst[n];
1506 GFC_TYPE_ARRAY_STRIDE (type, n) = gfc_conv_array_stride (desc, n);
1507 if (GFC_TYPE_ARRAY_LBOUND (type, n) == NULL_TREE)
1509 GFC_TYPE_ARRAY_LBOUND (type, n)
1510 = gfc_conv_descriptor_lbound (desc, dim);
1511 GFC_TYPE_ARRAY_UBOUND (type, n)
1512 = gfc_conv_descriptor_ubound (desc, dim);
1514 else if (GFC_TYPE_ARRAY_UBOUND (type, n) == NULL_TREE)
1516 tmp = fold_build2 (MINUS_EXPR, gfc_array_index_type,
1517 gfc_conv_descriptor_ubound (desc, dim),
1518 gfc_conv_descriptor_lbound (desc, dim));
1519 tmp = fold_build2 (PLUS_EXPR, gfc_array_index_type,
1520 GFC_TYPE_ARRAY_LBOUND (type, n),
1522 tmp = gfc_evaluate_now (tmp, block);
1523 GFC_TYPE_ARRAY_UBOUND (type, n) = tmp;
1525 tmp = fold_build2 (MULT_EXPR, gfc_array_index_type,
1526 GFC_TYPE_ARRAY_LBOUND (type, n),
1527 GFC_TYPE_ARRAY_STRIDE (type, n));
1528 offset = fold_build2 (MINUS_EXPR, gfc_array_index_type, offset, tmp);
1530 offset = gfc_evaluate_now (offset, block);
1531 GFC_TYPE_ARRAY_OFFSET (type) = offset;
1535 /* Extend MAPPING so that it maps dummy argument SYM to the value stored
1536 in SE. The caller may still use se->expr and se->string_length after
1537 calling this function. */
1540 gfc_add_interface_mapping (gfc_interface_mapping * mapping,
1541 gfc_symbol * sym, gfc_se * se,
1544 gfc_interface_sym_mapping *sm;
1548 gfc_symbol *new_sym;
1550 gfc_symtree *new_symtree;
1552 /* Create a new symbol to represent the actual argument. */
1553 new_sym = gfc_new_symbol (sym->name, NULL);
1554 new_sym->ts = sym->ts;
1555 new_sym->attr.referenced = 1;
1556 new_sym->attr.dimension = sym->attr.dimension;
1557 new_sym->attr.pointer = sym->attr.pointer;
1558 new_sym->attr.allocatable = sym->attr.allocatable;
1559 new_sym->attr.flavor = sym->attr.flavor;
1560 new_sym->attr.function = sym->attr.function;
1562 /* Create a fake symtree for it. */
1564 new_symtree = gfc_new_symtree (&root, sym->name);
1565 new_symtree->n.sym = new_sym;
1566 gcc_assert (new_symtree == root);
1568 /* Create a dummy->actual mapping. */
1569 sm = gfc_getmem (sizeof (*sm));
1570 sm->next = mapping->syms;
1572 sm->new = new_symtree;
1573 sm->expr = gfc_copy_expr (expr);
1576 /* Stabilize the argument's value. */
1577 if (!sym->attr.function && se)
1578 se->expr = gfc_evaluate_now (se->expr, &se->pre);
1580 if (sym->ts.type == BT_CHARACTER)
1582 /* Create a copy of the dummy argument's length. */
1583 new_sym->ts.cl = gfc_get_interface_mapping_charlen (mapping, sym->ts.cl);
1584 sm->expr->ts.cl = new_sym->ts.cl;
1586 /* If the length is specified as "*", record the length that
1587 the caller is passing. We should use the callee's length
1588 in all other cases. */
1589 if (!new_sym->ts.cl->length && se)
1591 se->string_length = gfc_evaluate_now (se->string_length, &se->pre);
1592 new_sym->ts.cl->backend_decl = se->string_length;
1599 /* Use the passed value as-is if the argument is a function. */
1600 if (sym->attr.flavor == FL_PROCEDURE)
1603 /* If the argument is either a string or a pointer to a string,
1604 convert it to a boundless character type. */
1605 else if (!sym->attr.dimension && sym->ts.type == BT_CHARACTER)
1607 tmp = gfc_get_character_type_len (sym->ts.kind, NULL);
1608 tmp = build_pointer_type (tmp);
1609 if (sym->attr.pointer)
1610 value = build_fold_indirect_ref (se->expr);
1613 value = fold_convert (tmp, value);
1616 /* If the argument is a scalar, a pointer to an array or an allocatable,
1618 else if (!sym->attr.dimension || sym->attr.pointer || sym->attr.allocatable)
1619 value = build_fold_indirect_ref (se->expr);
1621 /* For character(*), use the actual argument's descriptor. */
1622 else if (sym->ts.type == BT_CHARACTER && !new_sym->ts.cl->length)
1623 value = build_fold_indirect_ref (se->expr);
1625 /* If the argument is an array descriptor, use it to determine
1626 information about the actual argument's shape. */
1627 else if (POINTER_TYPE_P (TREE_TYPE (se->expr))
1628 && GFC_DESCRIPTOR_TYPE_P (TREE_TYPE (TREE_TYPE (se->expr))))
1630 /* Get the actual argument's descriptor. */
1631 desc = build_fold_indirect_ref (se->expr);
1633 /* Create the replacement variable. */
1634 tmp = gfc_conv_descriptor_data_get (desc);
1635 value = gfc_get_interface_mapping_array (&se->pre, sym,
1638 /* Use DESC to work out the upper bounds, strides and offset. */
1639 gfc_set_interface_mapping_bounds (&se->pre, TREE_TYPE (value), desc);
1642 /* Otherwise we have a packed array. */
1643 value = gfc_get_interface_mapping_array (&se->pre, sym,
1644 PACKED_FULL, se->expr);
1646 new_sym->backend_decl = value;
1650 /* Called once all dummy argument mappings have been added to MAPPING,
1651 but before the mapping is used to evaluate expressions. Pre-evaluate
1652 the length of each argument, adding any initialization code to PRE and
1653 any finalization code to POST. */
1656 gfc_finish_interface_mapping (gfc_interface_mapping * mapping,
1657 stmtblock_t * pre, stmtblock_t * post)
1659 gfc_interface_sym_mapping *sym;
1663 for (sym = mapping->syms; sym; sym = sym->next)
1664 if (sym->new->n.sym->ts.type == BT_CHARACTER
1665 && !sym->new->n.sym->ts.cl->backend_decl)
1667 expr = sym->new->n.sym->ts.cl->length;
1668 gfc_apply_interface_mapping_to_expr (mapping, expr);
1669 gfc_init_se (&se, NULL);
1670 gfc_conv_expr (&se, expr);
1672 se.expr = gfc_evaluate_now (se.expr, &se.pre);
1673 gfc_add_block_to_block (pre, &se.pre);
1674 gfc_add_block_to_block (post, &se.post);
1676 sym->new->n.sym->ts.cl->backend_decl = se.expr;
1681 /* Like gfc_apply_interface_mapping_to_expr, but applied to
1685 gfc_apply_interface_mapping_to_cons (gfc_interface_mapping * mapping,
1686 gfc_constructor * c)
1688 for (; c; c = c->next)
1690 gfc_apply_interface_mapping_to_expr (mapping, c->expr);
1693 gfc_apply_interface_mapping_to_expr (mapping, c->iterator->start);
1694 gfc_apply_interface_mapping_to_expr (mapping, c->iterator->end);
1695 gfc_apply_interface_mapping_to_expr (mapping, c->iterator->step);
1701 /* Like gfc_apply_interface_mapping_to_expr, but applied to
1705 gfc_apply_interface_mapping_to_ref (gfc_interface_mapping * mapping,
1710 for (; ref; ref = ref->next)
1714 for (n = 0; n < ref->u.ar.dimen; n++)
1716 gfc_apply_interface_mapping_to_expr (mapping, ref->u.ar.start[n]);
1717 gfc_apply_interface_mapping_to_expr (mapping, ref->u.ar.end[n]);
1718 gfc_apply_interface_mapping_to_expr (mapping, ref->u.ar.stride[n]);
1720 gfc_apply_interface_mapping_to_expr (mapping, ref->u.ar.offset);
1727 gfc_apply_interface_mapping_to_expr (mapping, ref->u.ss.start);
1728 gfc_apply_interface_mapping_to_expr (mapping, ref->u.ss.end);
1734 /* Convert intrinsic function calls into result expressions. */
1736 gfc_map_intrinsic_function (gfc_expr *expr, gfc_interface_mapping * mapping)
1744 arg1 = expr->value.function.actual->expr;
1745 if (expr->value.function.actual->next)
1746 arg2 = expr->value.function.actual->next->expr;
1750 sym = arg1->symtree->n.sym;
1752 if (sym->attr.dummy)
1757 switch (expr->value.function.isym->id)
1760 /* TODO figure out why this condition is necessary. */
1761 if (sym->attr.function
1762 && arg1->ts.cl->length->expr_type != EXPR_CONSTANT
1763 && arg1->ts.cl->length->expr_type != EXPR_VARIABLE)
1766 new_expr = gfc_copy_expr (arg1->ts.cl->length);
1773 if (arg2 && arg2->expr_type == EXPR_CONSTANT)
1775 dup = mpz_get_si (arg2->value.integer);
1780 dup = sym->as->rank;
1784 for (; d < dup; d++)
1787 tmp = gfc_add (gfc_copy_expr (sym->as->upper[d]), gfc_int_expr (1));
1788 tmp = gfc_subtract (tmp, gfc_copy_expr (sym->as->lower[d]));
1790 new_expr = gfc_multiply (new_expr, tmp);
1796 case GFC_ISYM_LBOUND:
1797 case GFC_ISYM_UBOUND:
1798 /* TODO These implementations of lbound and ubound do not limit if
1799 the size < 0, according to F95's 13.14.53 and 13.14.113. */
1804 if (arg2 && arg2->expr_type == EXPR_CONSTANT)
1805 d = mpz_get_si (arg2->value.integer) - 1;
1807 /* TODO: If the need arises, this could produce an array of
1811 if (expr->value.function.isym->id == GFC_ISYM_LBOUND)
1812 new_expr = gfc_copy_expr (sym->as->lower[d]);
1814 new_expr = gfc_copy_expr (sym->as->upper[d]);
1821 gfc_apply_interface_mapping_to_expr (mapping, new_expr);
1825 gfc_replace_expr (expr, new_expr);
1831 gfc_map_fcn_formal_to_actual (gfc_expr *expr, gfc_expr *map_expr,
1832 gfc_interface_mapping * mapping)
1834 gfc_formal_arglist *f;
1835 gfc_actual_arglist *actual;
1837 actual = expr->value.function.actual;
1838 f = map_expr->symtree->n.sym->formal;
1840 for (; f && actual; f = f->next, actual = actual->next)
1845 gfc_add_interface_mapping (mapping, f->sym, NULL, actual->expr);
1848 if (map_expr->symtree->n.sym->attr.dimension)
1853 as = gfc_copy_array_spec (map_expr->symtree->n.sym->as);
1855 for (d = 0; d < as->rank; d++)
1857 gfc_apply_interface_mapping_to_expr (mapping, as->lower[d]);
1858 gfc_apply_interface_mapping_to_expr (mapping, as->upper[d]);
1861 expr->value.function.esym->as = as;
1864 if (map_expr->symtree->n.sym->ts.type == BT_CHARACTER)
1866 expr->value.function.esym->ts.cl->length
1867 = gfc_copy_expr (map_expr->symtree->n.sym->ts.cl->length);
1869 gfc_apply_interface_mapping_to_expr (mapping,
1870 expr->value.function.esym->ts.cl->length);
1875 /* EXPR is a copy of an expression that appeared in the interface
1876 associated with MAPPING. Walk it recursively looking for references to
1877 dummy arguments that MAPPING maps to actual arguments. Replace each such
1878 reference with a reference to the associated actual argument. */
1881 gfc_apply_interface_mapping_to_expr (gfc_interface_mapping * mapping,
1884 gfc_interface_sym_mapping *sym;
1885 gfc_actual_arglist *actual;
1890 /* Copying an expression does not copy its length, so do that here. */
1891 if (expr->ts.type == BT_CHARACTER && expr->ts.cl)
1893 expr->ts.cl = gfc_get_interface_mapping_charlen (mapping, expr->ts.cl);
1894 gfc_apply_interface_mapping_to_expr (mapping, expr->ts.cl->length);
1897 /* Apply the mapping to any references. */
1898 gfc_apply_interface_mapping_to_ref (mapping, expr->ref);
1900 /* ...and to the expression's symbol, if it has one. */
1901 /* TODO Find out why the condition on expr->symtree had to be moved into
1902 the loop rather than being ouside it, as originally. */
1903 for (sym = mapping->syms; sym; sym = sym->next)
1904 if (expr->symtree && sym->old == expr->symtree->n.sym)
1906 if (sym->new->n.sym->backend_decl)
1907 expr->symtree = sym->new;
1909 gfc_replace_expr (expr, gfc_copy_expr (sym->expr));
1912 /* ...and to subexpressions in expr->value. */
1913 switch (expr->expr_type)
1918 case EXPR_SUBSTRING:
1922 gfc_apply_interface_mapping_to_expr (mapping, expr->value.op.op1);
1923 gfc_apply_interface_mapping_to_expr (mapping, expr->value.op.op2);
1927 for (actual = expr->value.function.actual; actual; actual = actual->next)
1928 gfc_apply_interface_mapping_to_expr (mapping, actual->expr);
1930 if (expr->value.function.esym == NULL
1931 && expr->value.function.isym != NULL
1932 && expr->value.function.actual->expr->symtree
1933 && gfc_map_intrinsic_function (expr, mapping))
1936 for (sym = mapping->syms; sym; sym = sym->next)
1937 if (sym->old == expr->value.function.esym)
1939 expr->value.function.esym = sym->new->n.sym;
1940 gfc_map_fcn_formal_to_actual (expr, sym->expr, mapping);
1941 expr->value.function.esym->result = sym->new->n.sym;
1946 case EXPR_STRUCTURE:
1947 gfc_apply_interface_mapping_to_cons (mapping, expr->value.constructor);
1955 /* Evaluate interface expression EXPR using MAPPING. Store the result
1959 gfc_apply_interface_mapping (gfc_interface_mapping * mapping,
1960 gfc_se * se, gfc_expr * expr)
1962 expr = gfc_copy_expr (expr);
1963 gfc_apply_interface_mapping_to_expr (mapping, expr);
1964 gfc_conv_expr (se, expr);
1965 se->expr = gfc_evaluate_now (se->expr, &se->pre);
1966 gfc_free_expr (expr);
1970 /* Returns a reference to a temporary array into which a component of
1971 an actual argument derived type array is copied and then returned
1972 after the function call. */
1974 gfc_conv_subref_array_arg (gfc_se * parmse, gfc_expr * expr,
1975 int g77, sym_intent intent)
1991 gcc_assert (expr->expr_type == EXPR_VARIABLE);
1993 gfc_init_se (&lse, NULL);
1994 gfc_init_se (&rse, NULL);
1996 /* Walk the argument expression. */
1997 rss = gfc_walk_expr (expr);
1999 gcc_assert (rss != gfc_ss_terminator);
2001 /* Initialize the scalarizer. */
2002 gfc_init_loopinfo (&loop);
2003 gfc_add_ss_to_loop (&loop, rss);
2005 /* Calculate the bounds of the scalarization. */
2006 gfc_conv_ss_startstride (&loop);
2008 /* Build an ss for the temporary. */
2009 if (expr->ts.type == BT_CHARACTER && !expr->ts.cl->backend_decl)
2010 gfc_conv_string_length (expr->ts.cl, &parmse->pre);
2012 base_type = gfc_typenode_for_spec (&expr->ts);
2013 if (GFC_ARRAY_TYPE_P (base_type)
2014 || GFC_DESCRIPTOR_TYPE_P (base_type))
2015 base_type = gfc_get_element_type (base_type);
2017 loop.temp_ss = gfc_get_ss ();;
2018 loop.temp_ss->type = GFC_SS_TEMP;
2019 loop.temp_ss->data.temp.type = base_type;
2021 if (expr->ts.type == BT_CHARACTER)
2022 loop.temp_ss->string_length = expr->ts.cl->backend_decl;
2024 loop.temp_ss->string_length = NULL;
2026 parmse->string_length = loop.temp_ss->string_length;
2027 loop.temp_ss->data.temp.dimen = loop.dimen;
2028 loop.temp_ss->next = gfc_ss_terminator;
2030 /* Associate the SS with the loop. */
2031 gfc_add_ss_to_loop (&loop, loop.temp_ss);
2033 /* Setup the scalarizing loops. */
2034 gfc_conv_loop_setup (&loop);
2036 /* Pass the temporary descriptor back to the caller. */
2037 info = &loop.temp_ss->data.info;
2038 parmse->expr = info->descriptor;
2040 /* Setup the gfc_se structures. */
2041 gfc_copy_loopinfo_to_se (&lse, &loop);
2042 gfc_copy_loopinfo_to_se (&rse, &loop);
2045 lse.ss = loop.temp_ss;
2046 gfc_mark_ss_chain_used (rss, 1);
2047 gfc_mark_ss_chain_used (loop.temp_ss, 1);
2049 /* Start the scalarized loop body. */
2050 gfc_start_scalarized_body (&loop, &body);
2052 /* Translate the expression. */
2053 gfc_conv_expr (&rse, expr);
2055 gfc_conv_tmp_array_ref (&lse);
2056 gfc_advance_se_ss_chain (&lse);
2058 if (intent != INTENT_OUT)
2060 tmp = gfc_trans_scalar_assign (&lse, &rse, expr->ts, true, false);
2061 gfc_add_expr_to_block (&body, tmp);
2062 gcc_assert (rse.ss == gfc_ss_terminator);
2063 gfc_trans_scalarizing_loops (&loop, &body);
2067 /* Make sure that the temporary declaration survives by merging
2068 all the loop declarations into the current context. */
2069 for (n = 0; n < loop.dimen; n++)
2071 gfc_merge_block_scope (&body);
2072 body = loop.code[loop.order[n]];
2074 gfc_merge_block_scope (&body);
2077 /* Add the post block after the second loop, so that any
2078 freeing of allocated memory is done at the right time. */
2079 gfc_add_block_to_block (&parmse->pre, &loop.pre);
2081 /**********Copy the temporary back again.*********/
2083 gfc_init_se (&lse, NULL);
2084 gfc_init_se (&rse, NULL);
2086 /* Walk the argument expression. */
2087 lss = gfc_walk_expr (expr);
2088 rse.ss = loop.temp_ss;
2091 /* Initialize the scalarizer. */
2092 gfc_init_loopinfo (&loop2);
2093 gfc_add_ss_to_loop (&loop2, lss);
2095 /* Calculate the bounds of the scalarization. */
2096 gfc_conv_ss_startstride (&loop2);
2098 /* Setup the scalarizing loops. */
2099 gfc_conv_loop_setup (&loop2);
2101 gfc_copy_loopinfo_to_se (&lse, &loop2);
2102 gfc_copy_loopinfo_to_se (&rse, &loop2);
2104 gfc_mark_ss_chain_used (lss, 1);
2105 gfc_mark_ss_chain_used (loop.temp_ss, 1);
2107 /* Declare the variable to hold the temporary offset and start the
2108 scalarized loop body. */
2109 offset = gfc_create_var (gfc_array_index_type, NULL);
2110 gfc_start_scalarized_body (&loop2, &body);
2112 /* Build the offsets for the temporary from the loop variables. The
2113 temporary array has lbounds of zero and strides of one in all
2114 dimensions, so this is very simple. The offset is only computed
2115 outside the innermost loop, so the overall transfer could be
2116 optimized further. */
2117 info = &rse.ss->data.info;
2119 tmp_index = gfc_index_zero_node;
2120 for (n = info->dimen - 1; n > 0; n--)
2123 tmp = rse.loop->loopvar[n];
2124 tmp = fold_build2 (MINUS_EXPR, gfc_array_index_type,
2125 tmp, rse.loop->from[n]);
2126 tmp = fold_build2 (PLUS_EXPR, gfc_array_index_type,
2129 tmp_str = fold_build2 (MINUS_EXPR, gfc_array_index_type,
2130 rse.loop->to[n-1], rse.loop->from[n-1]);
2131 tmp_str = fold_build2 (PLUS_EXPR, gfc_array_index_type,
2132 tmp_str, gfc_index_one_node);
2134 tmp_index = fold_build2 (MULT_EXPR, gfc_array_index_type,
2138 tmp_index = fold_build2 (MINUS_EXPR, gfc_array_index_type,
2139 tmp_index, rse.loop->from[0]);
2140 gfc_add_modify_expr (&rse.loop->code[0], offset, tmp_index);
2142 tmp_index = fold_build2 (PLUS_EXPR, gfc_array_index_type,
2143 rse.loop->loopvar[0], offset);
2145 /* Now use the offset for the reference. */
2146 tmp = build_fold_indirect_ref (info->data);
2147 rse.expr = gfc_build_array_ref (tmp, tmp_index, NULL);
2149 if (expr->ts.type == BT_CHARACTER)
2150 rse.string_length = expr->ts.cl->backend_decl;
2152 gfc_conv_expr (&lse, expr);
2154 gcc_assert (lse.ss == gfc_ss_terminator);
2156 tmp = gfc_trans_scalar_assign (&lse, &rse, expr->ts, false, false);
2157 gfc_add_expr_to_block (&body, tmp);
2159 /* Generate the copying loops. */
2160 gfc_trans_scalarizing_loops (&loop2, &body);
2162 /* Wrap the whole thing up by adding the second loop to the post-block
2163 and following it by the post-block of the first loop. In this way,
2164 if the temporary needs freeing, it is done after use! */
2165 if (intent != INTENT_IN)
2167 gfc_add_block_to_block (&parmse->post, &loop2.pre);
2168 gfc_add_block_to_block (&parmse->post, &loop2.post);
2171 gfc_add_block_to_block (&parmse->post, &loop.post);
2173 gfc_cleanup_loop (&loop);
2174 gfc_cleanup_loop (&loop2);
2176 /* Pass the string length to the argument expression. */
2177 if (expr->ts.type == BT_CHARACTER)
2178 parmse->string_length = expr->ts.cl->backend_decl;
2180 /* We want either the address for the data or the address of the descriptor,
2181 depending on the mode of passing array arguments. */
2183 parmse->expr = gfc_conv_descriptor_data_get (parmse->expr);
2185 parmse->expr = build_fold_addr_expr (parmse->expr);
2191 /* Generate the code for argument list functions. */
2194 conv_arglist_function (gfc_se *se, gfc_expr *expr, const char *name)
2196 /* Pass by value for g77 %VAL(arg), pass the address
2197 indirectly for %LOC, else by reference. Thus %REF
2198 is a "do-nothing" and %LOC is the same as an F95
2200 if (strncmp (name, "%VAL", 4) == 0)
2201 gfc_conv_expr (se, expr);
2202 else if (strncmp (name, "%LOC", 4) == 0)
2204 gfc_conv_expr_reference (se, expr);
2205 se->expr = gfc_build_addr_expr (NULL, se->expr);
2207 else if (strncmp (name, "%REF", 4) == 0)
2208 gfc_conv_expr_reference (se, expr);
2210 gfc_error ("Unknown argument list function at %L", &expr->where);
2214 /* Generate code for a procedure call. Note can return se->post != NULL.
2215 If se->direct_byref is set then se->expr contains the return parameter.
2216 Return nonzero, if the call has alternate specifiers. */
2219 gfc_conv_function_call (gfc_se * se, gfc_symbol * sym,
2220 gfc_actual_arglist * arg, tree append_args)
2222 gfc_interface_mapping mapping;
2236 gfc_formal_arglist *formal;
2237 int has_alternate_specifier = 0;
2238 bool need_interface_mapping;
2245 enum {MISSING = 0, ELEMENTAL, SCALAR, SCALAR_POINTER, ARRAY};
2247 arglist = NULL_TREE;
2248 retargs = NULL_TREE;
2249 stringargs = NULL_TREE;
2253 if (sym->from_intmod == INTMOD_ISO_C_BINDING)
2255 if (sym->intmod_sym_id == ISOCBINDING_LOC)
2257 if (arg->expr->rank == 0)
2258 gfc_conv_expr_reference (se, arg->expr);
2262 /* This is really the actual arg because no formal arglist is
2263 created for C_LOC. */
2264 fsym = arg->expr->symtree->n.sym;
2266 /* We should want it to do g77 calling convention. */
2268 && !(fsym->attr.pointer || fsym->attr.allocatable)
2269 && fsym->as->type != AS_ASSUMED_SHAPE;
2270 f = f || !sym->attr.always_explicit;
2272 argss = gfc_walk_expr (arg->expr);
2273 gfc_conv_array_parameter (se, arg->expr, argss, f);
2276 /* TODO -- the following two lines shouldn't be necessary, but
2277 they're removed a bug is exposed later in the codepath.
2278 This is workaround was thus introduced, but will have to be
2279 removed; please see PR 35150 for details about the issue. */
2280 se->expr = convert (pvoid_type_node, se->expr);
2281 se->expr = gfc_evaluate_now (se->expr, &se->pre);
2285 else if (sym->intmod_sym_id == ISOCBINDING_FUNLOC)
2287 arg->expr->ts.type = sym->ts.derived->ts.type;
2288 arg->expr->ts.f90_type = sym->ts.derived->ts.f90_type;
2289 arg->expr->ts.kind = sym->ts.derived->ts.kind;
2290 gfc_conv_expr_reference (se, arg->expr);
2294 else if (sym->intmod_sym_id == ISOCBINDING_ASSOCIATED)
2299 /* Build the addr_expr for the first argument. The argument is
2300 already an *address* so we don't need to set want_pointer in
2302 gfc_init_se (&arg1se, NULL);
2303 gfc_conv_expr (&arg1se, arg->expr);
2304 gfc_add_block_to_block (&se->pre, &arg1se.pre);
2305 gfc_add_block_to_block (&se->post, &arg1se.post);
2307 /* See if we were given two arguments. */
2308 if (arg->next == NULL)
2309 /* Only given one arg so generate a null and do a
2310 not-equal comparison against the first arg. */
2311 se->expr = fold_build2 (NE_EXPR, boolean_type_node, arg1se.expr,
2312 fold_convert (TREE_TYPE (arg1se.expr),
2313 null_pointer_node));
2319 /* Given two arguments so build the arg2se from second arg. */
2320 gfc_init_se (&arg2se, NULL);
2321 gfc_conv_expr (&arg2se, arg->next->expr);
2322 gfc_add_block_to_block (&se->pre, &arg2se.pre);
2323 gfc_add_block_to_block (&se->post, &arg2se.post);
2325 /* Generate test to compare that the two args are equal. */
2326 eq_expr = fold_build2 (EQ_EXPR, boolean_type_node,
2327 arg1se.expr, arg2se.expr);
2328 /* Generate test to ensure that the first arg is not null. */
2329 not_null_expr = fold_build2 (NE_EXPR, boolean_type_node,
2330 arg1se.expr, null_pointer_node);
2332 /* Finally, the generated test must check that both arg1 is not
2333 NULL and that it is equal to the second arg. */
2334 se->expr = fold_build2 (TRUTH_AND_EXPR, boolean_type_node,
2335 not_null_expr, eq_expr);
2344 if (!sym->attr.elemental)
2346 gcc_assert (se->ss->type == GFC_SS_FUNCTION);
2347 if (se->ss->useflags)
2349 gcc_assert (gfc_return_by_reference (sym)
2350 && sym->result->attr.dimension);
2351 gcc_assert (se->loop != NULL);
2353 /* Access the previously obtained result. */
2354 gfc_conv_tmp_array_ref (se);
2355 gfc_advance_se_ss_chain (se);
2359 info = &se->ss->data.info;
2364 gfc_init_block (&post);
2365 gfc_init_interface_mapping (&mapping);
2366 need_interface_mapping = ((sym->ts.type == BT_CHARACTER
2367 && sym->ts.cl->length
2368 && sym->ts.cl->length->expr_type
2370 || sym->attr.dimension);
2371 formal = sym->formal;
2372 /* Evaluate the arguments. */
2373 for (; arg != NULL; arg = arg->next, formal = formal ? formal->next : NULL)
2376 fsym = formal ? formal->sym : NULL;
2377 parm_kind = MISSING;
2381 if (se->ignore_optional)
2383 /* Some intrinsics have already been resolved to the correct
2387 else if (arg->label)
2389 has_alternate_specifier = 1;
2394 /* Pass a NULL pointer for an absent arg. */
2395 gfc_init_se (&parmse, NULL);
2396 parmse.expr = null_pointer_node;
2397 if (arg->missing_arg_type == BT_CHARACTER)
2398 parmse.string_length = build_int_cst (gfc_charlen_type_node, 0);
2401 else if (se->ss && se->ss->useflags)
2403 /* An elemental function inside a scalarized loop. */
2404 gfc_init_se (&parmse, se);
2405 gfc_conv_expr_reference (&parmse, e);
2406 parm_kind = ELEMENTAL;
2410 /* A scalar or transformational function. */
2411 gfc_init_se (&parmse, NULL);
2412 argss = gfc_walk_expr (e);
2414 if (argss == gfc_ss_terminator)
2416 if (fsym && fsym->attr.value)
2418 if (fsym->ts.type == BT_CHARACTER
2419 && fsym->ts.is_c_interop
2420 && fsym->ns->proc_name != NULL
2421 && fsym->ns->proc_name->attr.is_bind_c)
2424 gfc_conv_scalar_char_value (fsym, &parmse, &e);
2425 if (parmse.expr == NULL)
2426 gfc_conv_expr (&parmse, e);
2429 gfc_conv_expr (&parmse, e);
2431 else if (arg->name && arg->name[0] == '%')
2432 /* Argument list functions %VAL, %LOC and %REF are signalled
2433 through arg->name. */
2434 conv_arglist_function (&parmse, arg->expr, arg->name);
2435 else if ((e->expr_type == EXPR_FUNCTION)
2436 && e->symtree->n.sym->attr.pointer
2437 && fsym && fsym->attr.target)
2439 gfc_conv_expr (&parmse, e);
2440 parmse.expr = build_fold_addr_expr (parmse.expr);
2444 gfc_conv_expr_reference (&parmse, e);
2445 if (fsym && fsym->attr.pointer
2446 && fsym->attr.flavor != FL_PROCEDURE
2447 && e->expr_type != EXPR_NULL)
2449 /* Scalar pointer dummy args require an extra level of
2450 indirection. The null pointer already contains
2451 this level of indirection. */
2452 parm_kind = SCALAR_POINTER;
2453 parmse.expr = build_fold_addr_expr (parmse.expr);
2459 /* If the procedure requires an explicit interface, the actual
2460 argument is passed according to the corresponding formal
2461 argument. If the corresponding formal argument is a POINTER,
2462 ALLOCATABLE or assumed shape, we do not use g77's calling
2463 convention, and pass the address of the array descriptor
2464 instead. Otherwise we use g77's calling convention. */
2467 && !(fsym->attr.pointer || fsym->attr.allocatable)
2468 && fsym->as->type != AS_ASSUMED_SHAPE;
2469 f = f || !sym->attr.always_explicit;
2471 if (e->expr_type == EXPR_VARIABLE
2472 && is_subref_array (e))
2473 /* The actual argument is a component reference to an
2474 array of derived types. In this case, the argument
2475 is converted to a temporary, which is passed and then
2476 written back after the procedure call. */
2477 gfc_conv_subref_array_arg (&parmse, e, f,
2478 fsym ? fsym->attr.intent : INTENT_INOUT);
2480 gfc_conv_array_parameter (&parmse, e, argss, f);
2482 /* If an ALLOCATABLE dummy argument has INTENT(OUT) and is
2483 allocated on entry, it must be deallocated. */
2484 if (fsym && fsym->attr.allocatable
2485 && fsym->attr.intent == INTENT_OUT)
2487 tmp = build_fold_indirect_ref (parmse.expr);
2488 tmp = gfc_trans_dealloc_allocated (tmp);
2489 gfc_add_expr_to_block (&se->pre, tmp);
2495 /* The case with fsym->attr.optional is that of a user subroutine
2496 with an interface indicating an optional argument. When we call
2497 an intrinsic subroutine, however, fsym is NULL, but we might still
2498 have an optional argument, so we proceed to the substitution
2500 if (e && (fsym == NULL || fsym->attr.optional))
2502 /* If an optional argument is itself an optional dummy argument,
2503 check its presence and substitute a null if absent. */
2504 if (e->expr_type == EXPR_VARIABLE
2505 && e->symtree->n.sym->attr.optional)
2506 gfc_conv_missing_dummy (&parmse, e, fsym ? fsym->ts : e->ts,
2507 e->representation.length);
2512 /* Obtain the character length of an assumed character length
2513 length procedure from the typespec. */
2514 if (fsym->ts.type == BT_CHARACTER
2515 && parmse.string_length == NULL_TREE
2516 && e->ts.type == BT_PROCEDURE
2517 && e->symtree->n.sym->ts.type == BT_CHARACTER
2518 && e->symtree->n.sym->ts.cl->length != NULL)
2520 gfc_conv_const_charlen (e->symtree->n.sym->ts.cl);
2521 parmse.string_length = e->symtree->n.sym->ts.cl->backend_decl;
2525 if (fsym && need_interface_mapping && e)
2526 gfc_add_interface_mapping (&mapping, fsym, &parmse, e);
2528 gfc_add_block_to_block (&se->pre, &parmse.pre);
2529 gfc_add_block_to_block (&post, &parmse.post);
2531 /* Allocated allocatable components of derived types must be
2532 deallocated for INTENT(OUT) dummy arguments and non-variable
2533 scalars. Non-variable arrays are dealt with in trans-array.c
2534 (gfc_conv_array_parameter). */
2535 if (e && e->ts.type == BT_DERIVED
2536 && e->ts.derived->attr.alloc_comp
2537 && ((formal && formal->sym->attr.intent == INTENT_OUT)
2539 (e->expr_type != EXPR_VARIABLE && !e->rank)))
2542 tmp = build_fold_indirect_ref (parmse.expr);
2543 parm_rank = e->rank;
2551 case (SCALAR_POINTER):
2552 tmp = build_fold_indirect_ref (tmp);
2559 tmp = gfc_deallocate_alloc_comp (e->ts.derived, tmp, parm_rank);
2560 if (e->expr_type == EXPR_VARIABLE && e->symtree->n.sym->attr.optional)
2561 tmp = build3_v (COND_EXPR, gfc_conv_expr_present (e->symtree->n.sym),
2562 tmp, build_empty_stmt ());
2564 if (e->expr_type != EXPR_VARIABLE)
2565 /* Don't deallocate non-variables until they have been used. */
2566 gfc_add_expr_to_block (&se->post, tmp);
2569 gcc_assert (formal && formal->sym->attr.intent == INTENT_OUT);
2570 gfc_add_expr_to_block (&se->pre, tmp);
2574 /* Character strings are passed as two parameters, a length and a
2575 pointer - except for Bind(c) which only passes the pointer. */
2576 if (parmse.string_length != NULL_TREE && !sym->attr.is_bind_c)
2577 stringargs = gfc_chainon_list (stringargs, parmse.string_length);
2579 arglist = gfc_chainon_list (arglist, parmse.expr);
2581 gfc_finish_interface_mapping (&mapping, &se->pre, &se->post);
2584 if (ts.type == BT_CHARACTER && !sym->attr.is_bind_c)
2586 if (sym->ts.cl->length == NULL)
2588 /* Assumed character length results are not allowed by 5.1.1.5 of the
2589 standard and are trapped in resolve.c; except in the case of SPREAD
2590 (and other intrinsics?) and dummy functions. In the case of SPREAD,
2591 we take the character length of the first argument for the result.
2592 For dummies, we have to look through the formal argument list for
2593 this function and use the character length found there.*/
2594 if (!sym->attr.dummy)
2595 cl.backend_decl = TREE_VALUE (stringargs);
2598 formal = sym->ns->proc_name->formal;
2599 for (; formal; formal = formal->next)
2600 if (strcmp (formal->sym->name, sym->name) == 0)
2601 cl.backend_decl = formal->sym->ts.cl->backend_decl;
2608 /* Calculate the length of the returned string. */
2609 gfc_init_se (&parmse, NULL);
2610 if (need_interface_mapping)
2611 gfc_apply_interface_mapping (&mapping, &parmse, sym->ts.cl->length);
2613 gfc_conv_expr (&parmse, sym->ts.cl->length);
2614 gfc_add_block_to_block (&se->pre, &parmse.pre);
2615 gfc_add_block_to_block (&se->post, &parmse.post);
2617 tmp = fold_convert (gfc_charlen_type_node, parmse.expr);
2618 tmp = fold_build2 (MAX_EXPR, gfc_charlen_type_node, tmp,
2619 build_int_cst (gfc_charlen_type_node, 0));
2620 cl.backend_decl = tmp;
2623 /* Set up a charlen structure for it. */
2628 len = cl.backend_decl;
2631 byref = gfc_return_by_reference (sym);
2634 if (se->direct_byref)
2636 /* Sometimes, too much indirection can be applied; eg. for
2637 function_result = array_valued_recursive_function. */
2638 if (TREE_TYPE (TREE_TYPE (se->expr))
2639 && TREE_TYPE (TREE_TYPE (TREE_TYPE (se->expr)))
2640 && GFC_DESCRIPTOR_TYPE_P
2641 (TREE_TYPE (TREE_TYPE (TREE_TYPE (se->expr)))))
2642 se->expr = build_fold_indirect_ref (se->expr);
2644 retargs = gfc_chainon_list (retargs, se->expr);
2646 else if (sym->result->attr.dimension)
2648 gcc_assert (se->loop && info);
2650 /* Set the type of the array. */
2651 tmp = gfc_typenode_for_spec (&ts);
2652 info->dimen = se->loop->dimen;
2654 /* Evaluate the bounds of the result, if known. */
2655 gfc_set_loop_bounds_from_array_spec (&mapping, se, sym->result->as);
2657 /* Create a temporary to store the result. In case the function
2658 returns a pointer, the temporary will be a shallow copy and
2659 mustn't be deallocated. */
2660 callee_alloc = sym->attr.allocatable || sym->attr.pointer;
2661 gfc_trans_create_temp_array (&se->pre, &se->post, se->loop, info, tmp,
2662 false, !sym->attr.pointer, callee_alloc);
2664 /* Pass the temporary as the first argument. */
2665 tmp = info->descriptor;
2666 tmp = build_fold_addr_expr (tmp);
2667 retargs = gfc_chainon_list (retargs, tmp);
2669 else if (ts.type == BT_CHARACTER)
2671 /* Pass the string length. */
2672 type = gfc_get_character_type (ts.kind, ts.cl);
2673 type = build_pointer_type (type);
2675 /* Return an address to a char[0:len-1]* temporary for
2676 character pointers. */
2677 if (sym->attr.pointer || sym->attr.allocatable)
2679 var = gfc_create_var (type, "pstr");
2681 /* Provide an address expression for the function arguments. */
2682 var = build_fold_addr_expr (var);
2685 var = gfc_conv_string_tmp (se, type, len);
2687 retargs = gfc_chainon_list (retargs, var);
2691 gcc_assert (gfc_option.flag_f2c && ts.type == BT_COMPLEX);
2693 type = gfc_get_complex_type (ts.kind);
2694 var = build_fold_addr_expr (gfc_create_var (type, "cmplx"));
2695 retargs = gfc_chainon_list (retargs, var);
2698 /* Add the string length to the argument list. */
2699 if (ts.type == BT_CHARACTER)
2700 retargs = gfc_chainon_list (retargs, len);
2702 gfc_free_interface_mapping (&mapping);
2704 /* Add the return arguments. */
2705 arglist = chainon (retargs, arglist);
2707 /* Add the hidden string length parameters to the arguments. */
2708 arglist = chainon (arglist, stringargs);
2710 /* We may want to append extra arguments here. This is used e.g. for
2711 calls to libgfortran_matmul_??, which need extra information. */
2712 if (append_args != NULL_TREE)
2713 arglist = chainon (arglist, append_args);
2715 /* Generate the actual call. */
2716 gfc_conv_function_val (se, sym);
2718 /* If there are alternate return labels, function type should be
2719 integer. Can't modify the type in place though, since it can be shared
2720 with other functions. For dummy arguments, the typing is done to
2721 to this result, even if it has to be repeated for each call. */
2722 if (has_alternate_specifier
2723 && TREE_TYPE (TREE_TYPE (TREE_TYPE (se->expr))) != integer_type_node)
2725 if (!sym->attr.dummy)
2727 TREE_TYPE (sym->backend_decl)
2728 = build_function_type (integer_type_node,
2729 TYPE_ARG_TYPES (TREE_TYPE (sym->backend_decl)));
2730 se->expr = build_fold_addr_expr (sym->backend_decl);
2733 TREE_TYPE (TREE_TYPE (TREE_TYPE (se->expr))) = integer_type_node;
2736 fntype = TREE_TYPE (TREE_TYPE (se->expr));
2737 se->expr = build_call_list (TREE_TYPE (fntype), se->expr, arglist);
2739 /* If we have a pointer function, but we don't want a pointer, e.g.
2742 where f is pointer valued, we have to dereference the result. */
2743 if (!se->want_pointer && !byref && sym->attr.pointer)
2744 se->expr = build_fold_indirect_ref (se->expr);
2746 /* f2c calling conventions require a scalar default real function to
2747 return a double precision result. Convert this back to default
2748 real. We only care about the cases that can happen in Fortran 77.
2750 if (gfc_option.flag_f2c && sym->ts.type == BT_REAL
2751 && sym->ts.kind == gfc_default_real_kind
2752 && !sym->attr.always_explicit)
2753 se->expr = fold_convert (gfc_get_real_type (sym->ts.kind), se->expr);
2755 /* A pure function may still have side-effects - it may modify its
2757 TREE_SIDE_EFFECTS (se->expr) = 1;
2759 if (!sym->attr.pure)
2760 TREE_SIDE_EFFECTS (se->expr) = 1;
2765 /* Add the function call to the pre chain. There is no expression. */
2766 gfc_add_expr_to_block (&se->pre, se->expr);
2767 se->expr = NULL_TREE;
2769 if (!se->direct_byref)
2771 if (sym->attr.dimension)
2773 if (flag_bounds_check)
2775 /* Check the data pointer hasn't been modified. This would
2776 happen in a function returning a pointer. */
2777 tmp = gfc_conv_descriptor_data_get (info->descriptor);
2778 tmp = fold_build2 (NE_EXPR, boolean_type_node,
2780 gfc_trans_runtime_check (tmp, &se->pre, NULL, gfc_msg_fault);
2782 se->expr = info->descriptor;
2783 /* Bundle in the string length. */
2784 se->string_length = len;
2786 else if (sym->ts.type == BT_CHARACTER)
2788 /* Dereference for character pointer results. */
2789 if (sym->attr.pointer || sym->attr.allocatable)
2790 se->expr = build_fold_indirect_ref (var);
2794 se->string_length = len;
2798 gcc_assert (sym->ts.type == BT_COMPLEX && gfc_option.flag_f2c);
2799 se->expr = build_fold_indirect_ref (var);
2804 /* Follow the function call with the argument post block. */
2806 gfc_add_block_to_block (&se->pre, &post);
2808 gfc_add_block_to_block (&se->post, &post);
2810 return has_alternate_specifier;
2814 /* Generate code to copy a string. */
2817 gfc_trans_string_copy (stmtblock_t * block, tree dlength, tree dest,
2818 tree slength, tree src)
2820 tree tmp, dlen, slen;
2828 stmtblock_t tempblock;
2830 if (slength != NULL_TREE)
2832 slen = fold_convert (size_type_node, gfc_evaluate_now (slength, block));
2833 ssc = gfc_to_single_character (slen, src);
2837 slen = build_int_cst (size_type_node, 1);
2841 if (dlength != NULL_TREE)
2843 dlen = fold_convert (size_type_node, gfc_evaluate_now (dlength, block));
2844 dsc = gfc_to_single_character (slen, dest);
2848 dlen = build_int_cst (size_type_node, 1);
2852 if (slength != NULL_TREE && POINTER_TYPE_P (TREE_TYPE (src)))
2853 ssc = gfc_to_single_character (slen, src);
2854 if (dlength != NULL_TREE && POINTER_TYPE_P (TREE_TYPE (dest)))
2855 dsc = gfc_to_single_character (dlen, dest);
2858 if (dsc != NULL_TREE && ssc != NULL_TREE)
2860 gfc_add_modify_expr (block, dsc, ssc);
2864 /* Do nothing if the destination length is zero. */
2865 cond = fold_build2 (GT_EXPR, boolean_type_node, dlen,
2866 build_int_cst (size_type_node, 0));
2868 /* The following code was previously in _gfortran_copy_string:
2870 // The two strings may overlap so we use memmove.
2872 copy_string (GFC_INTEGER_4 destlen, char * dest,
2873 GFC_INTEGER_4 srclen, const char * src)
2875 if (srclen >= destlen)
2877 // This will truncate if too long.
2878 memmove (dest, src, destlen);
2882 memmove (dest, src, srclen);
2884 memset (&dest[srclen], ' ', destlen - srclen);
2888 We're now doing it here for better optimization, but the logic
2892 dest = fold_convert (pvoid_type_node, dest);
2894 dest = gfc_build_addr_expr (pvoid_type_node, dest);
2897 src = fold_convert (pvoid_type_node, src);
2899 src = gfc_build_addr_expr (pvoid_type_node, src);
2901 /* Truncate string if source is too long. */
2902 cond2 = fold_build2 (GE_EXPR, boolean_type_node, slen, dlen);
2903 tmp2 = build_call_expr (built_in_decls[BUILT_IN_MEMMOVE],
2904 3, dest, src, dlen);
2906 /* Else copy and pad with spaces. */
2907 tmp3 = build_call_expr (built_in_decls[BUILT_IN_MEMMOVE],
2908 3, dest, src, slen);
2910 tmp4 = fold_build2 (POINTER_PLUS_EXPR, TREE_TYPE (dest), dest,
2911 fold_convert (sizetype, slen));
2912 tmp4 = build_call_expr (built_in_decls[BUILT_IN_MEMSET], 3,
2914 build_int_cst (gfc_get_int_type (gfc_c_int_kind),
2915 lang_hooks.to_target_charset (' ')),
2916 fold_build2 (MINUS_EXPR, TREE_TYPE(dlen),
2919 gfc_init_block (&tempblock);
2920 gfc_add_expr_to_block (&tempblock, tmp3);
2921 gfc_add_expr_to_block (&tempblock, tmp4);
2922 tmp3 = gfc_finish_block (&tempblock);
2924 /* The whole copy_string function is there. */
2925 tmp = fold_build3 (COND_EXPR, void_type_node, cond2, tmp2, tmp3);
2926 tmp = fold_build3 (COND_EXPR, void_type_node, cond, tmp, build_empty_stmt ());
2927 gfc_add_expr_to_block (block, tmp);
2931 /* Translate a statement function.
2932 The value of a statement function reference is obtained by evaluating the
2933 expression using the values of the actual arguments for the values of the
2934 corresponding dummy arguments. */
2937 gfc_conv_statement_function (gfc_se * se, gfc_expr * expr)
2941 gfc_formal_arglist *fargs;
2942 gfc_actual_arglist *args;
2945 gfc_saved_var *saved_vars;
2951 sym = expr->symtree->n.sym;
2952 args = expr->value.function.actual;
2953 gfc_init_se (&lse, NULL);
2954 gfc_init_se (&rse, NULL);
2957 for (fargs = sym->formal; fargs; fargs = fargs->next)
2959 saved_vars = (gfc_saved_var *)gfc_getmem (n * sizeof (gfc_saved_var));
2960 temp_vars = (tree *)gfc_getmem (n * sizeof (tree));
2962 for (fargs = sym->formal, n = 0; fargs; fargs = fargs->next, n++)
2964 /* Each dummy shall be specified, explicitly or implicitly, to be
2966 gcc_assert (fargs->sym->attr.dimension == 0);
2969 /* Create a temporary to hold the value. */
2970 type = gfc_typenode_for_spec (&fsym->ts);
2971 temp_vars[n] = gfc_create_var (type, fsym->name);
2973 if (fsym->ts.type == BT_CHARACTER)
2975 /* Copy string arguments. */
2978 gcc_assert (fsym->ts.cl && fsym->ts.cl->length
2979 && fsym->ts.cl->length->expr_type == EXPR_CONSTANT);
2981 arglen = TYPE_MAX_VALUE (TYPE_DOMAIN (type));
2982 tmp = gfc_build_addr_expr (build_pointer_type (type),
2985 gfc_conv_expr (&rse, args->expr);
2986 gfc_conv_string_parameter (&rse);
2987 gfc_add_block_to_block (&se->pre, &lse.pre);
2988 gfc_add_block_to_block (&se->pre, &rse.pre);
2990 gfc_trans_string_copy (&se->pre, arglen, tmp, rse.string_length,
2992 gfc_add_block_to_block (&se->pre, &lse.post);
2993 gfc_add_block_to_block (&se->pre, &rse.post);
2997 /* For everything else, just evaluate the expression. */
2998 gfc_conv_expr (&lse, args->expr);
3000 gfc_add_block_to_block (&se->pre, &lse.pre);
3001 gfc_add_modify_expr (&se->pre, temp_vars[n], lse.expr);
3002 gfc_add_block_to_block (&se->pre, &lse.post);
3008 /* Use the temporary variables in place of the real ones. */
3009 for (fargs = sym->formal, n = 0; fargs; fargs = fargs->next, n++)
3010 gfc_shadow_sym (fargs->sym, temp_vars[n], &saved_vars[n]);
3012 gfc_conv_expr (se, sym->value);
3014 if (sym->ts.type == BT_CHARACTER)
3016 gfc_conv_const_charlen (sym->ts.cl);
3018 /* Force the expression to the correct length. */
3019 if (!INTEGER_CST_P (se->string_length)
3020 || tree_int_cst_lt (se->string_length,
3021 sym->ts.cl->backend_decl))
3023 type = gfc_get_character_type (sym->ts.kind, sym->ts.cl);
3024 tmp = gfc_create_var (type, sym->name);
3025 tmp = gfc_build_addr_expr (build_pointer_type (type), tmp);
3026 gfc_trans_string_copy (&se->pre, sym->ts.cl->backend_decl, tmp,
3027 se->string_length, se->expr);
3030 se->string_length = sym->ts.cl->backend_decl;
3033 /* Restore the original variables. */
3034 for (fargs = sym->formal, n = 0; fargs; fargs = fargs->next, n++)
3035 gfc_restore_sym (fargs->sym, &saved_vars[n]);
3036 gfc_free (saved_vars);
3040 /* Translate a function expression. */
3043 gfc_conv_function_expr (gfc_se * se, gfc_expr * expr)
3047 if (expr->value.function.isym)
3049 gfc_conv_intrinsic_function (se, expr);
3053 /* We distinguish statement functions from general functions to improve
3054 runtime performance. */
3055 if (expr->symtree->n.sym->attr.proc == PROC_ST_FUNCTION)
3057 gfc_conv_statement_function (se, expr);
3061 /* expr.value.function.esym is the resolved (specific) function symbol for
3062 most functions. However this isn't set for dummy procedures. */
3063 sym = expr->value.function.esym;
3065 sym = expr->symtree->n.sym;
3066 gfc_conv_function_call (se, sym, expr->value.function.actual, NULL_TREE);
3071 gfc_conv_array_constructor_expr (gfc_se * se, gfc_expr * expr)
3073 gcc_assert (se->ss != NULL && se->ss != gfc_ss_terminator);
3074 gcc_assert (se->ss->expr == expr && se->ss->type == GFC_SS_CONSTRUCTOR);
3076 gfc_conv_tmp_array_ref (se);
3077 gfc_advance_se_ss_chain (se);
3081 /* Build a static initializer. EXPR is the expression for the initial value.
3082 The other parameters describe the variable of the component being
3083 initialized. EXPR may be null. */
3086 gfc_conv_initializer (gfc_expr * expr, gfc_typespec * ts, tree type,
3087 bool array, bool pointer)
3091 if (!(expr || pointer))
3094 /* Check if we have ISOCBINDING_NULL_PTR or ISOCBINDING_NULL_FUNPTR
3095 (these are the only two iso_c_binding derived types that can be
3096 used as initialization expressions). If so, we need to modify
3097 the 'expr' to be that for a (void *). */
3098 if (expr != NULL && expr->ts.type == BT_DERIVED
3099 && expr->ts.is_iso_c && expr->ts.derived)
3101 gfc_symbol *derived = expr->ts.derived;
3103 expr = gfc_int_expr (0);
3105 /* The derived symbol has already been converted to a (void *). Use
3107 expr->ts.f90_type = derived->ts.f90_type;
3108 expr->ts.kind = derived->ts.kind;
3113 /* Arrays need special handling. */
3115 return gfc_build_null_descriptor (type);
3117 return gfc_conv_array_initializer (type, expr);
3120 return fold_convert (type, null_pointer_node);
3126 gfc_init_se (&se, NULL);
3127 gfc_conv_structure (&se, expr, 1);
3131 return gfc_conv_string_init (ts->cl->backend_decl,expr);
3134 gfc_init_se (&se, NULL);
3135 gfc_conv_constant (&se, expr);
3142 gfc_trans_subarray_assign (tree dest, gfc_component * cm, gfc_expr * expr)
3154 gfc_start_block (&block);
3156 /* Initialize the scalarizer. */
3157 gfc_init_loopinfo (&loop);
3159 gfc_init_se (&lse, NULL);
3160 gfc_init_se (&rse, NULL);
3163 rss = gfc_walk_expr (expr);
3164 if (rss == gfc_ss_terminator)
3166 /* The rhs is scalar. Add a ss for the expression. */
3167 rss = gfc_get_ss ();
3168 rss->next = gfc_ss_terminator;
3169 rss->type = GFC_SS_SCALAR;
3173 /* Create a SS for the destination. */
3174 lss = gfc_get_ss ();
3175 lss->type = GFC_SS_COMPONENT;
3177 lss->shape = gfc_get_shape (cm->as->rank);
3178 lss->next = gfc_ss_terminator;
3179 lss->data.info.dimen = cm->as->rank;
3180 lss->data.info.descriptor = dest;
3181 lss->data.info.data = gfc_conv_array_data (dest);
3182 lss->data.info.offset = gfc_conv_array_offset (dest);
3183 for (n = 0; n < cm->as->rank; n++)
3185 lss->data.info.dim[n] = n;
3186 lss->data.info.start[n] = gfc_conv_array_lbound (dest, n);
3187 lss->data.info.stride[n] = gfc_index_one_node;
3189 mpz_init (lss->shape[n]);
3190 mpz_sub (lss->shape[n], cm->as->upper[n]->value.integer,
3191 cm->as->lower[n]->value.integer);
3192 mpz_add_ui (lss->shape[n], lss->shape[n], 1);
3195 /* Associate the SS with the loop. */
3196 gfc_add_ss_to_loop (&loop, lss);
3197 gfc_add_ss_to_loop (&loop, rss);
3199 /* Calculate the bounds of the scalarization. */
3200 gfc_conv_ss_startstride (&loop);
3202 /* Setup the scalarizing loops. */
3203 gfc_conv_loop_setup (&loop);
3205 /* Setup the gfc_se structures. */
3206 gfc_copy_loopinfo_to_se (&lse, &loop);
3207 gfc_copy_loopinfo_to_se (&rse, &loop);
3210 gfc_mark_ss_chain_used (rss, 1);
3212 gfc_mark_ss_chain_used (lss, 1);
3214 /* Start the scalarized loop body. */
3215 gfc_start_scalarized_body (&loop, &body);
3217 gfc_conv_tmp_array_ref (&lse);
3218 if (cm->ts.type == BT_CHARACTER)
3219 lse.string_length = cm->ts.cl->backend_decl;
3221 gfc_conv_expr (&rse, expr);
3223 tmp = gfc_trans_scalar_assign (&lse, &rse, cm->ts, true, false);
3224 gfc_add_expr_to_block (&body, tmp);
3226 gcc_assert (rse.ss == gfc_ss_terminator);
3228 /* Generate the copying loops. */
3229 gfc_trans_scalarizing_loops (&loop, &body);
3231 /* Wrap the whole thing up. */
3232 gfc_add_block_to_block (&block, &loop.pre);
3233 gfc_add_block_to_block (&block, &loop.post);
3235 for (n = 0; n < cm->as->rank; n++)
3236 mpz_clear (lss->shape[n]);
3237 gfc_free (lss->shape);
3239 gfc_cleanup_loop (&loop);
3241 return gfc_finish_block (&block);
3245 /* Assign a single component of a derived type constructor. */
3248 gfc_trans_subcomponent_assign (tree dest, gfc_component * cm, gfc_expr * expr)
3258 gfc_start_block (&block);
3262 gfc_init_se (&se, NULL);
3263 /* Pointer component. */
3266 /* Array pointer. */
3267 if (expr->expr_type == EXPR_NULL)
3268 gfc_conv_descriptor_data_set (&block, dest, null_pointer_node);
3271 rss = gfc_walk_expr (expr);
3272 se.direct_byref = 1;
3274 gfc_conv_expr_descriptor (&se, expr, rss);
3275 gfc_add_block_to_block (&block, &se.pre);
3276 gfc_add_block_to_block (&block, &se.post);
3281 /* Scalar pointers. */
3282 se.want_pointer = 1;
3283 gfc_conv_expr (&se, expr);
3284 gfc_add_block_to_block (&block, &se.pre);
3285 gfc_add_modify_expr (&block, dest,
3286 fold_convert (TREE_TYPE (dest), se.expr));
3287 gfc_add_block_to_block (&block, &se.post);
3290 else if (cm->dimension)
3292 if (cm->allocatable && expr->expr_type == EXPR_NULL)
3293 gfc_conv_descriptor_data_set (&block, dest, null_pointer_node);
3294 else if (cm->allocatable)
3298 gfc_init_se (&se, NULL);
3300 rss = gfc_walk_expr (expr);
3301 se.want_pointer = 0;
3302 gfc_conv_expr_descriptor (&se, expr, rss);
3303 gfc_add_block_to_block (&block, &se.pre);
3305 tmp = fold_convert (TREE_TYPE (dest), se.expr);
3306 gfc_add_modify_expr (&block, dest, tmp);
3308 if (cm->ts.type == BT_DERIVED && cm->ts.derived->attr.alloc_comp)
3309 tmp = gfc_copy_alloc_comp (cm->ts.derived, se.expr, dest,
3312 tmp = gfc_duplicate_allocatable (dest, se.expr,
3313 TREE_TYPE(cm->backend_decl),
3316 gfc_add_expr_to_block (&block, tmp);
3318 gfc_add_block_to_block (&block, &se.post);
3319 gfc_conv_descriptor_data_set (&block, se.expr, null_pointer_node);
3321 /* Shift the lbound and ubound of temporaries to being unity, rather
3322 than zero, based. Calculate the offset for all cases. */
3323 offset = gfc_conv_descriptor_offset (dest);
3324 gfc_add_modify_expr (&block, offset, gfc_index_zero_node);
3325 tmp2 =gfc_create_var (gfc_array_index_type, NULL);
3326 for (n = 0; n < expr->rank; n++)
3328 if (expr->expr_type != EXPR_VARIABLE
3329 && expr->expr_type != EXPR_CONSTANT)
3332 tmp = gfc_conv_descriptor_ubound (dest, gfc_rank_cst[n]);
3333 span = fold_build2 (MINUS_EXPR, gfc_array_index_type, tmp,
3334 gfc_conv_descriptor_lbound (dest, gfc_rank_cst[n]));
3335 gfc_add_modify_expr (&block, tmp,
3336 fold_build2 (PLUS_EXPR,
3337 gfc_array_index_type,
3338 span, gfc_index_one_node));
3339 tmp = gfc_conv_descriptor_lbound (dest, gfc_rank_cst[n]);
3340 gfc_add_modify_expr (&block, tmp, gfc_index_one_node);
3342 tmp = fold_build2 (MULT_EXPR, gfc_array_index_type,
3343 gfc_conv_descriptor_lbound (dest,
3345 gfc_conv_descriptor_stride (dest,
3347 gfc_add_modify_expr (&block, tmp2, tmp);
3348 tmp = fold_build2 (MINUS_EXPR, gfc_array_index_type, offset, tmp2);
3349 gfc_add_modify_expr (&block, offset, tmp);
3354 tmp = gfc_trans_subarray_assign (dest, cm, expr);
3355 gfc_add_expr_to_block (&block, tmp);
3358 else if (expr->ts.type == BT_DERIVED)
3360 if (expr->expr_type != EXPR_STRUCTURE)
3362 gfc_init_se (&se, NULL);
3363 gfc_conv_expr (&se, expr);
3364 gfc_add_modify_expr (&block, dest,
3365 fold_convert (TREE_TYPE (dest), se.expr));
3369 /* Nested constructors. */
3370 tmp = gfc_trans_structure_assign (dest, expr);
3371 gfc_add_expr_to_block (&block, tmp);
3376 /* Scalar component. */
3377 gfc_init_se (&se, NULL);
3378 gfc_init_se (&lse, NULL);
3380 gfc_conv_expr (&se, expr);
3381 if (cm->ts.type == BT_CHARACTER)
3382 lse.string_length = cm->ts.cl->backend_decl;
3384 tmp = gfc_trans_scalar_assign (&lse, &se, cm->ts, true, false);
3385 gfc_add_expr_to_block (&block, tmp);
3387 return gfc_finish_block (&block);
3390 /* Assign a derived type constructor to a variable. */
3393 gfc_trans_structure_assign (tree dest, gfc_expr * expr)
3401 gfc_start_block (&block);
3402 cm = expr->ts.derived->components;
3403 for (c = expr->value.constructor; c; c = c->next, cm = cm->next)
3405 /* Skip absent members in default initializers. */
3409 /* Update the type/kind of the expression if it represents either
3410 C_NULL_PTR or C_NULL_FUNPTR. This is done here because this may
3411 be the first place reached for initializing output variables that
3412 have components of type C_PTR/C_FUNPTR that are initialized. */
3413 if (c->expr->ts.type == BT_DERIVED && c->expr->ts.derived
3414 && c->expr->ts.derived->attr.is_iso_c)
3416 c->expr->expr_type = EXPR_NULL;
3417 c->expr->ts.type = c->expr->ts.derived->ts.type;
3418 c->expr->ts.f90_type = c->expr->ts.derived->ts.f90_type;
3419 c->expr->ts.kind = c->expr->ts.derived->ts.kind;
3422 field = cm->backend_decl;
3423 tmp = fold_build3 (COMPONENT_REF, TREE_TYPE (field),
3424 dest, field, NULL_TREE);
3425 tmp = gfc_trans_subcomponent_assign (tmp, cm, c->expr);
3426 gfc_add_expr_to_block (&block, tmp);
3428 return gfc_finish_block (&block);
3431 /* Build an expression for a constructor. If init is nonzero then
3432 this is part of a static variable initializer. */
3435 gfc_conv_structure (gfc_se * se, gfc_expr * expr, int init)
3442 VEC(constructor_elt,gc) *v = NULL;
3444 gcc_assert (se->ss == NULL);
3445 gcc_assert (expr->expr_type == EXPR_STRUCTURE);
3446 type = gfc_typenode_for_spec (&expr->ts);
3450 /* Create a temporary variable and fill it in. */
3451 se->expr = gfc_create_var (type, expr->ts.derived->name);
3452 tmp = gfc_trans_structure_assign (se->expr, expr);
3453 gfc_add_expr_to_block (&se->pre, tmp);
3457 cm = expr->ts.derived->components;
3459 for (c = expr->value.constructor; c; c = c->next, cm = cm->next)
3461 /* Skip absent members in default initializers and allocatable
3462 components. Although the latter have a default initializer
3463 of EXPR_NULL,... by default, the static nullify is not needed
3464 since this is done every time we come into scope. */
3465 if (!c->expr || cm->allocatable)
3468 val = gfc_conv_initializer (c->expr, &cm->ts,
3469 TREE_TYPE (cm->backend_decl), cm->dimension, cm->pointer);
3471 /* Append it to the constructor list. */
3472 CONSTRUCTOR_APPEND_ELT (v, cm->backend_decl, val);
3474 se->expr = build_constructor (type, v);
3477 TREE_CONSTANT(se->expr) = 1;
3478 TREE_INVARIANT(se->expr) = 1;
3483 /* Translate a substring expression. */
3486 gfc_conv_substring_expr (gfc_se * se, gfc_expr * expr)
3492 gcc_assert (ref == NULL || ref->type == REF_SUBSTRING);
3494 se->expr = gfc_build_string_const (expr->value.character.length,
3495 expr->value.character.string);
3496 se->string_length = TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (se->expr)));
3497 TYPE_STRING_FLAG (TREE_TYPE (se->expr)) = 1;
3500 gfc_conv_substring (se, ref, expr->ts.kind, NULL, &expr->where);
3504 /* Entry point for expression translation. Evaluates a scalar quantity.
3505 EXPR is the expression to be translated, and SE is the state structure if
3506 called from within the scalarized. */
3509 gfc_conv_expr (gfc_se * se, gfc_expr * expr)
3511 if (se->ss && se->ss->expr == expr
3512 && (se->ss->type == GFC_SS_SCALAR || se->ss->type == GFC_SS_REFERENCE))
3514 /* Substitute a scalar expression evaluated outside the scalarization
3516 se->expr = se->ss->data.scalar.expr;
3517 se->string_length = se->ss->string_length;
3518 gfc_advance_se_ss_chain (se);
3522 /* We need to convert the expressions for the iso_c_binding derived types.
3523 C_NULL_PTR and C_NULL_FUNPTR will be made EXPR_NULL, which evaluates to
3524 null_pointer_node. C_PTR and C_FUNPTR are converted to match the
3525 typespec for the C_PTR and C_FUNPTR symbols, which has already been
3526 updated to be an integer with a kind equal to the size of a (void *). */
3527 if (expr->ts.type == BT_DERIVED && expr->ts.derived
3528 && expr->ts.derived->attr.is_iso_c)
3530 if (expr->symtree->n.sym->intmod_sym_id == ISOCBINDING_NULL_PTR
3531 || expr->symtree->n.sym->intmod_sym_id == ISOCBINDING_NULL_FUNPTR)
3533 /* Set expr_type to EXPR_NULL, which will result in
3534 null_pointer_node being used below. */
3535 expr->expr_type = EXPR_NULL;
3539 /* Update the type/kind of the expression to be what the new
3540 type/kind are for the updated symbols of C_PTR/C_FUNPTR. */
3541 expr->ts.type = expr->ts.derived->ts.type;
3542 expr->ts.f90_type = expr->ts.derived->ts.f90_type;
3543 expr->ts.kind = expr->ts.derived->ts.kind;
3547 switch (expr->expr_type)
3550 gfc_conv_expr_op (se, expr);
3554 gfc_conv_function_expr (se, expr);
3558 gfc_conv_constant (se, expr);
3562 gfc_conv_variable (se, expr);
3566 se->expr = null_pointer_node;
3569 case EXPR_SUBSTRING:
3570 gfc_conv_substring_expr (se, expr);
3573 case EXPR_STRUCTURE:
3574 gfc_conv_structure (se, expr, 0);
3578 gfc_conv_array_constructor_expr (se, expr);
3587 /* Like gfc_conv_expr_val, but the value is also suitable for use in the lhs
3588 of an assignment. */
3590 gfc_conv_expr_lhs (gfc_se * se, gfc_expr * expr)
3592 gfc_conv_expr (se, expr);
3593 /* All numeric lvalues should have empty post chains. If not we need to
3594 figure out a way of rewriting an lvalue so that it has no post chain. */
3595 gcc_assert (expr->ts.type == BT_CHARACTER || !se->post.head);
3598 /* Like gfc_conv_expr, but the POST block is guaranteed to be empty for
3599 numeric expressions. Used for scalar values where inserting cleanup code
3602 gfc_conv_expr_val (gfc_se * se, gfc_expr * expr)
3606 gcc_assert (expr->ts.type != BT_CHARACTER);
3607 gfc_conv_expr (se, expr);
3610 val = gfc_create_var (TREE_TYPE (se->expr), NULL);
3611 gfc_add_modify_expr (&se->pre, val, se->expr);
3613 gfc_add_block_to_block (&se->pre, &se->post);
3617 /* Helper to translate an expression and convert it to a particular type. */
3619 gfc_conv_expr_type (gfc_se * se, gfc_expr * expr, tree type)
3621 gfc_conv_expr_val (se, expr);
3622 se->expr = convert (type, se->expr);
3626 /* Converts an expression so that it can be passed by reference. Scalar
3630 gfc_conv_expr_reference (gfc_se * se, gfc_expr * expr)
3634 if (se->ss && se->ss->expr == expr
3635 && se->ss->type == GFC_SS_REFERENCE)
3637 se->expr = se->ss->data.scalar.expr;
3638 se->string_length = se->ss->string_length;
3639 gfc_advance_se_ss_chain (se);
3643 if (expr->ts.type == BT_CHARACTER)
3645 gfc_conv_expr (se, expr);
3646 gfc_conv_string_parameter (se);
3650 if (expr->expr_type == EXPR_VARIABLE)
3652 se->want_pointer = 1;
3653 gfc_conv_expr (se, expr);
3656 var = gfc_create_var (TREE_TYPE (se->expr), NULL);
3657 gfc_add_modify_expr (&se->pre, var, se->expr);
3658 gfc_add_block_to_block (&se->pre, &se->post);
3664 if (expr->expr_type == EXPR_FUNCTION
3665 && expr->symtree->n.sym->attr.pointer
3666 && !expr->symtree->n.sym->attr.dimension)
3668 se->want_pointer = 1;
3669 gfc_conv_expr (se, expr);
3670 var = gfc_create_var (TREE_TYPE (se->expr), NULL);
3671 gfc_add_modify_expr (&se->pre, var, se->expr);
3677 gfc_conv_expr (se, expr);
3679 /* Create a temporary var to hold the value. */
3680 if (TREE_CONSTANT (se->expr))
3682 tree tmp = se->expr;
3683 STRIP_TYPE_NOPS (tmp);
3684 var = build_decl (CONST_DECL, NULL, TREE_TYPE (tmp));
3685 DECL_INITIAL (var) = tmp;
3686 TREE_STATIC (var) = 1;
3691 var = gfc_create_var (TREE_TYPE (se->expr), NULL);
3692 gfc_add_modify_expr (&se->pre, var, se->expr);
3694 gfc_add_block_to_block (&se->pre, &se->post);
3696 /* Take the address of that value. */
3697 se->expr = build_fold_addr_expr (var);
3702 gfc_trans_pointer_assign (gfc_code * code)
3704 return gfc_trans_pointer_assignment (code->expr, code->expr2);
3708 /* Generate code for a pointer assignment. */
3711 gfc_trans_pointer_assignment (gfc_expr * expr1, gfc_expr * expr2)
3723 gfc_start_block (&block);
3725 gfc_init_se (&lse, NULL);
3727 lss = gfc_walk_expr (expr1);
3728 rss = gfc_walk_expr (expr2);
3729 if (lss == gfc_ss_terminator)
3731 /* Scalar pointers. */
3732 lse.want_pointer = 1;
3733 gfc_conv_expr (&lse, expr1);
3734 gcc_assert (rss == gfc_ss_terminator);
3735 gfc_init_se (&rse, NULL);
3736 rse.want_pointer = 1;
3737 gfc_conv_expr (&rse, expr2);
3738 gfc_add_block_to_block (&block, &lse.pre);
3739 gfc_add_block_to_block (&block, &rse.pre);
3740 gfc_add_modify_expr (&block, lse.expr,
3741 fold_convert (TREE_TYPE (lse.expr), rse.expr));
3742 gfc_add_block_to_block (&block, &rse.post);
3743 gfc_add_block_to_block (&block, &lse.post);
3747 /* Array pointer. */
3748 gfc_conv_expr_descriptor (&lse, expr1, lss);
3749 switch (expr2->expr_type)
3752 /* Just set the data pointer to null. */
3753 gfc_conv_descriptor_data_set (&lse.pre, lse.expr, null_pointer_node);
3757 /* Assign directly to the pointer's descriptor. */
3758 lse.direct_byref = 1;
3759 gfc_conv_expr_descriptor (&lse, expr2, rss);
3761 /* If this is a subreference array pointer assignment, use the rhs
3762 descriptor element size for the lhs span. */
3763 if (expr1->symtree->n.sym->attr.subref_array_pointer)
3765 decl = expr1->symtree->n.sym->backend_decl;
3766 gfc_init_se (&rse, NULL);
3767 rse.descriptor_only = 1;
3768 gfc_conv_expr (&rse, expr2);
3769 tmp = gfc_get_element_type (TREE_TYPE (rse.expr));
3770 tmp = fold_convert (gfc_array_index_type, size_in_bytes (tmp));
3771 if (!INTEGER_CST_P (tmp))
3772 gfc_add_block_to_block (&lse.post, &rse.pre);
3773 gfc_add_modify_expr (&lse.post, GFC_DECL_SPAN(decl), tmp);
3779 /* Assign to a temporary descriptor and then copy that
3780 temporary to the pointer. */
3782 tmp = gfc_create_var (TREE_TYPE (desc), "ptrtemp");
3785 lse.direct_byref = 1;
3786 gfc_conv_expr_descriptor (&lse, expr2, rss);
3787 gfc_add_modify_expr (&lse.pre, desc, tmp);
3790 gfc_add_block_to_block (&block, &lse.pre);
3791 gfc_add_block_to_block (&block, &lse.post);
3793 return gfc_finish_block (&block);
3797 /* Makes sure se is suitable for passing as a function string parameter. */
3798 /* TODO: Need to check all callers fo this function. It may be abused. */
3801 gfc_conv_string_parameter (gfc_se * se)
3805 if (TREE_CODE (se->expr) == STRING_CST)
3807 se->expr = gfc_build_addr_expr (pchar_type_node, se->expr);
3811 type = TREE_TYPE (se->expr);
3812 if (TYPE_STRING_FLAG (type))
3814 if (TREE_CODE (se->expr) != INDIRECT_REF)
3815 se->expr = gfc_build_addr_expr (pchar_type_node, se->expr);
3818 type = gfc_get_character_type_len (gfc_default_character_kind,
3820 type = build_pointer_type (type);
3821 se->expr = gfc_build_addr_expr (type, se->expr);
3825 gcc_assert (POINTER_TYPE_P (TREE_TYPE (se->expr)));
3826 gcc_assert (se->string_length
3827 && TREE_CODE (TREE_TYPE (se->string_length)) == INTEGER_TYPE);
3831 /* Generate code for assignment of scalar variables. Includes character
3832 strings and derived types with allocatable components. */
3835 gfc_trans_scalar_assign (gfc_se * lse, gfc_se * rse, gfc_typespec ts,
3836 bool l_is_temp, bool r_is_var)
3842 gfc_init_block (&block);
3844 if (ts.type == BT_CHARACTER)
3849 if (lse->string_length != NULL_TREE)
3851 gfc_conv_string_parameter (lse);
3852 gfc_add_block_to_block (&block, &lse->pre);
3853 llen = lse->string_length;
3856 if (rse->string_length != NULL_TREE)
3858 gcc_assert (rse->string_length != NULL_TREE);
3859 gfc_conv_string_parameter (rse);
3860 gfc_add_block_to_block (&block, &rse->pre);
3861 rlen = rse->string_length;
3864 gfc_trans_string_copy (&block, llen, lse->expr, rlen, rse->expr);
3866 else if (ts.type == BT_DERIVED && ts.derived->attr.alloc_comp)
3870 /* Are the rhs and the lhs the same? */
3873 cond = fold_build2 (EQ_EXPR, boolean_type_node,
3874 build_fold_addr_expr (lse->expr),
3875 build_fold_addr_expr (rse->expr));
3876 cond = gfc_evaluate_now (cond, &lse->pre);
3879 /* Deallocate the lhs allocated components as long as it is not
3880 the same as the rhs. This must be done following the assignment
3881 to prevent deallocating data that could be used in the rhs
3885 tmp = gfc_evaluate_now (lse->expr, &lse->pre);
3886 tmp = gfc_deallocate_alloc_comp (ts.derived, tmp, 0);
3888 tmp = build3_v (COND_EXPR, cond, build_empty_stmt (), tmp);
3889 gfc_add_expr_to_block (&lse->post, tmp);
3892 gfc_add_block_to_block (&block, &rse->pre);
3893 gfc_add_block_to_block (&block, &lse->pre);
3895 gfc_add_modify_expr (&block, lse->expr,
3896 fold_convert (TREE_TYPE (lse->expr), rse->expr));
3898 /* Do a deep copy if the rhs is a variable, if it is not the
3902 tmp = gfc_copy_alloc_comp (ts.derived, rse->expr, lse->expr, 0);
3903 tmp = build3_v (COND_EXPR, cond, build_empty_stmt (), tmp);
3904 gfc_add_expr_to_block (&block, tmp);
3909 gfc_add_block_to_block (&block, &lse->pre);
3910 gfc_add_block_to_block (&block, &rse->pre);
3912 gfc_add_modify_expr (&block, lse->expr,
3913 fold_convert (TREE_TYPE (lse->expr), rse->expr));
3916 gfc_add_block_to_block (&block, &lse->post);
3917 gfc_add_block_to_block (&block, &rse->post);
3919 return gfc_finish_block (&block);
3923 /* Try to translate array(:) = func (...), where func is a transformational
3924 array function, without using a temporary. Returns NULL is this isn't the
3928 gfc_trans_arrayfunc_assign (gfc_expr * expr1, gfc_expr * expr2)
3933 bool seen_array_ref;
3935 /* The caller has already checked rank>0 and expr_type == EXPR_FUNCTION. */
3936 if (expr2->value.function.isym && !gfc_is_intrinsic_libcall (expr2))
3939 /* Elemental functions don't need a temporary anyway. */
3940 if (expr2->value.function.esym != NULL
3941 && expr2->value.function.esym->attr.elemental)
3944 /* Fail if EXPR1 can't be expressed as a descriptor. */
3945 if (gfc_ref_needs_temporary_p (expr1->ref))
3948 /* Functions returning pointers need temporaries. */
3949 if (expr2->symtree->n.sym->attr.pointer
3950 || expr2->symtree->n.sym->attr.allocatable)
3953 /* Character array functions need temporaries unless the
3954 character lengths are the same. */
3955 if (expr2->ts.type == BT_CHARACTER && expr2->rank > 0)
3957 if (expr1->ts.cl->length == NULL
3958 || expr1->ts.cl->length->expr_type != EXPR_CONSTANT)
3961 if (expr2->ts.cl->length == NULL
3962 || expr2->ts.cl->length->expr_type != EXPR_CONSTANT)
3965 if (mpz_cmp (expr1->ts.cl->length->value.integer,
3966 expr2->ts.cl->length->value.integer) != 0)
3970 /* Check that no LHS component references appear during an array
3971 reference. This is needed because we do not have the means to
3972 span any arbitrary stride with an array descriptor. This check
3973 is not needed for the rhs because the function result has to be
3975 seen_array_ref = false;
3976 for (ref = expr1->ref; ref; ref = ref->next)
3978 if (ref->type == REF_ARRAY)
3979 seen_array_ref= true;
3980 else if (ref->type == REF_COMPONENT && seen_array_ref)
3984 /* Check for a dependency. */
3985 if (gfc_check_fncall_dependency (expr1, INTENT_OUT,
3986 expr2->value.function.esym,
3987 expr2->value.function.actual))
3990 /* The frontend doesn't seem to bother filling in expr->symtree for intrinsic
3992 gcc_assert (expr2->value.function.isym
3993 || (gfc_return_by_reference (expr2->value.function.esym)
3994 && expr2->value.function.esym->result->attr.dimension));
3996 ss = gfc_walk_expr (expr1);
3997 gcc_assert (ss != gfc_ss_terminator);
3998 gfc_init_se (&se, NULL);
3999 gfc_start_block (&se.pre);
4000 se.want_pointer = 1;
4002 gfc_conv_array_parameter (&se, expr1, ss, 0);
4004 se.direct_byref = 1;
4005 se.ss = gfc_walk_expr (expr2);
4006 gcc_assert (se.ss != gfc_ss_terminator);
4007 gfc_conv_function_expr (&se, expr2);
4008 gfc_add_block_to_block (&se.pre, &se.post);
4010 return gfc_finish_block (&se.pre);
4013 /* Determine whether the given EXPR_CONSTANT is a zero initializer. */
4016 is_zero_initializer_p (gfc_expr * expr)
4018 if (expr->expr_type != EXPR_CONSTANT)
4021 /* We ignore constants with prescribed memory representations for now. */
4022 if (expr->representation.string)
4025 switch (expr->ts.type)
4028 return mpz_cmp_si (expr->value.integer, 0) == 0;
4031 return mpfr_zero_p (expr->value.real)
4032 && MPFR_SIGN (expr->value.real) >= 0;
4035 return expr->value.logical == 0;
4038 return mpfr_zero_p (expr->value.complex.r)
4039 && MPFR_SIGN (expr->value.complex.r) >= 0
4040 && mpfr_zero_p (expr->value.complex.i)
4041 && MPFR_SIGN (expr->value.complex.i) >= 0;
4049 /* Try to efficiently translate array(:) = 0. Return NULL if this
4053 gfc_trans_zero_assign (gfc_expr * expr)
4055 tree dest, len, type;
4059 sym = expr->symtree->n.sym;
4060 dest = gfc_get_symbol_decl (sym);
4062 type = TREE_TYPE (dest);
4063 if (POINTER_TYPE_P (type))
4064 type = TREE_TYPE (type);
4065 if (!GFC_ARRAY_TYPE_P (type))
4068 /* Determine the length of the array. */
4069 len = GFC_TYPE_ARRAY_SIZE (type);
4070 if (!len || TREE_CODE (len) != INTEGER_CST)
4073 tmp = TYPE_SIZE_UNIT (gfc_get_element_type (type));
4074 len = fold_build2 (MULT_EXPR, gfc_array_index_type, len,
4075 fold_convert (gfc_array_index_type, tmp));
4077 /* Convert arguments to the correct types. */
4078 if (!POINTER_TYPE_P (TREE_TYPE (dest)))
4079 dest = gfc_build_addr_expr (pvoid_type_node, dest);
4081 dest = fold_convert (pvoid_type_node, dest);
4082 len = fold_convert (size_type_node, len);
4084 /* Construct call to __builtin_memset. */
4085 tmp = build_call_expr (built_in_decls[BUILT_IN_MEMSET],
4086 3, dest, integer_zero_node, len);
4087 return fold_convert (void_type_node, tmp);
4091 /* Helper for gfc_trans_array_copy and gfc_trans_array_constructor_copy
4092 that constructs the call to __builtin_memcpy. */
4095 gfc_build_memcpy_call (tree dst, tree src, tree len)
4099 /* Convert arguments to the correct types. */
4100 if (!POINTER_TYPE_P (TREE_TYPE (dst)))
4101 dst = gfc_build_addr_expr (pvoid_type_node, dst);
4103 dst = fold_convert (pvoid_type_node, dst);
4105 if (!POINTER_TYPE_P (TREE_TYPE (src)))
4106 src = gfc_build_addr_expr (pvoid_type_node, src);
4108 src = fold_convert (pvoid_type_node, src);
4110 len = fold_convert (size_type_node, len);
4112 /* Construct call to __builtin_memcpy. */
4113 tmp = build_call_expr (built_in_decls[BUILT_IN_MEMCPY], 3, dst, src, len);
4114 return fold_convert (void_type_node, tmp);
4118 /* Try to efficiently translate dst(:) = src(:). Return NULL if this
4119 can't be done. EXPR1 is the destination/lhs and EXPR2 is the
4120 source/rhs, both are gfc_full_array_ref_p which have been checked for
4124 gfc_trans_array_copy (gfc_expr * expr1, gfc_expr * expr2)
4126 tree dst, dlen, dtype;
4127 tree src, slen, stype;
4130 dst = gfc_get_symbol_decl (expr1->symtree->n.sym);
4131 src = gfc_get_symbol_decl (expr2->symtree->n.sym);
4133 dtype = TREE_TYPE (dst);
4134 if (POINTER_TYPE_P (dtype))
4135 dtype = TREE_TYPE (dtype);
4136 stype = TREE_TYPE (src);
4137 if (POINTER_TYPE_P (stype))
4138 stype = TREE_TYPE (stype);
4140 if (!GFC_ARRAY_TYPE_P (dtype) || !GFC_ARRAY_TYPE_P (stype))
4143 /* Determine the lengths of the arrays. */
4144 dlen = GFC_TYPE_ARRAY_SIZE (dtype);
4145 if (!dlen || TREE_CODE (dlen) != INTEGER_CST)
4147 tmp = TYPE_SIZE_UNIT (gfc_get_element_type (dtype));
4148 dlen = fold_build2 (MULT_EXPR, gfc_array_index_type, dlen,
4149 fold_convert (gfc_array_index_type, tmp));
4151 slen = GFC_TYPE_ARRAY_SIZE (stype);
4152 if (!slen || TREE_CODE (slen) != INTEGER_CST)
4154 tmp = TYPE_SIZE_UNIT (gfc_get_element_type (stype));
4155 slen = fold_build2 (MULT_EXPR, gfc_array_index_type, slen,
4156 fold_convert (gfc_array_index_type, tmp));
4158 /* Sanity check that they are the same. This should always be
4159 the case, as we should already have checked for conformance. */
4160 if (!tree_int_cst_equal (slen, dlen))
4163 return gfc_build_memcpy_call (dst, src, dlen);
4167 /* Try to efficiently translate array(:) = (/ ... /). Return NULL if
4168 this can't be done. EXPR1 is the destination/lhs for which
4169 gfc_full_array_ref_p is true, and EXPR2 is the source/rhs. */
4172 gfc_trans_array_constructor_copy (gfc_expr * expr1, gfc_expr * expr2)
4174 unsigned HOST_WIDE_INT nelem;
4180 nelem = gfc_constant_array_constructor_p (expr2->value.constructor);
4184 dst = gfc_get_symbol_decl (expr1->symtree->n.sym);
4185 dtype = TREE_TYPE (dst);
4186 if (POINTER_TYPE_P (dtype))
4187 dtype = TREE_TYPE (dtype);
4188 if (!GFC_ARRAY_TYPE_P (dtype))
4191 /* Determine the lengths of the array. */
4192 len = GFC_TYPE_ARRAY_SIZE (dtype);
4193 if (!len || TREE_CODE (len) != INTEGER_CST)
4196 /* Confirm that the constructor is the same size. */
4197 if (compare_tree_int (len, nelem) != 0)
4200 tmp = TYPE_SIZE_UNIT (gfc_get_element_type (dtype));
4201 len = fold_build2 (MULT_EXPR, gfc_array_index_type, len,
4202 fold_convert (gfc_array_index_type, tmp));
4204 stype = gfc_typenode_for_spec (&expr2->ts);
4205 src = gfc_build_constant_array_constructor (expr2, stype);
4207 stype = TREE_TYPE (src);
4208 if (POINTER_TYPE_P (stype))
4209 stype = TREE_TYPE (stype);
4211 return gfc_build_memcpy_call (dst, src, len);
4215 /* Subroutine of gfc_trans_assignment that actually scalarizes the
4216 assignment. EXPR1 is the destination/RHS and EXPR2 is the source/LHS. */
4219 gfc_trans_assignment_1 (gfc_expr * expr1, gfc_expr * expr2, bool init_flag)
4224 gfc_ss *lss_section;
4232 /* Assignment of the form lhs = rhs. */
4233 gfc_start_block (&block);
4235 gfc_init_se (&lse, NULL);
4236 gfc_init_se (&rse, NULL);
4239 lss = gfc_walk_expr (expr1);
4241 if (lss != gfc_ss_terminator)
4243 /* The assignment needs scalarization. */
4246 /* Find a non-scalar SS from the lhs. */
4247 while (lss_section != gfc_ss_terminator
4248 && lss_section->type != GFC_SS_SECTION)
4249 lss_section = lss_section->next;
4251 gcc_assert (lss_section != gfc_ss_terminator);
4253 /* Initialize the scalarizer. */
4254 gfc_init_loopinfo (&loop);
4257 rss = gfc_walk_expr (expr2);
4258 if (rss == gfc_ss_terminator)
4260 /* The rhs is scalar. Add a ss for the expression. */
4261 rss = gfc_get_ss ();
4262 rss->next = gfc_ss_terminator;
4263 rss->type = GFC_SS_SCALAR;
4266 /* Associate the SS with the loop. */
4267 gfc_add_ss_to_loop (&loop, lss);
4268 gfc_add_ss_to_loop (&loop, rss);
4270 /* Calculate the bounds of the scalarization. */
4271 gfc_conv_ss_startstride (&loop);
4272 /* Resolve any data dependencies in the statement. */
4273 gfc_conv_resolve_dependencies (&loop, lss, rss);
4274 /* Setup the scalarizing loops. */
4275 gfc_conv_loop_setup (&loop);
4277 /* Setup the gfc_se structures. */
4278 gfc_copy_loopinfo_to_se (&lse, &loop);
4279 gfc_copy_loopinfo_to_se (&rse, &loop);
4282 gfc_mark_ss_chain_used (rss, 1);
4283 if (loop.temp_ss == NULL)
4286 gfc_mark_ss_chain_used (lss, 1);
4290 lse.ss = loop.temp_ss;
4291 gfc_mark_ss_chain_used (lss, 3);
4292 gfc_mark_ss_chain_used (loop.temp_ss, 3);
4295 /* Start the scalarized loop body. */
4296 gfc_start_scalarized_body (&loop, &body);
4299 gfc_init_block (&body);
4301 l_is_temp = (lss != gfc_ss_terminator && loop.temp_ss != NULL);
4303 /* Translate the expression. */
4304 gfc_conv_expr (&rse, expr2);
4308 gfc_conv_tmp_array_ref (&lse);
4309 gfc_advance_se_ss_chain (&lse);
4312 gfc_conv_expr (&lse, expr1);
4314 tmp = gfc_trans_scalar_assign (&lse, &rse, expr1->ts,
4315 l_is_temp || init_flag,
4316 expr2->expr_type == EXPR_VARIABLE);
4317 gfc_add_expr_to_block (&body, tmp);
4319 if (lss == gfc_ss_terminator)
4321 /* Use the scalar assignment as is. */
4322 gfc_add_block_to_block (&block, &body);
4326 gcc_assert (lse.ss == gfc_ss_terminator
4327 && rse.ss == gfc_ss_terminator);
4331 gfc_trans_scalarized_loop_boundary (&loop, &body);
4333 /* We need to copy the temporary to the actual lhs. */
4334 gfc_init_se (&lse, NULL);
4335 gfc_init_se (&rse, NULL);
4336 gfc_copy_loopinfo_to_se (&lse, &loop);
4337 gfc_copy_loopinfo_to_se (&rse, &loop);
4339 rse.ss = loop.temp_ss;
4342 gfc_conv_tmp_array_ref (&rse);
4343 gfc_advance_se_ss_chain (&rse);
4344 gfc_conv_expr (&lse, expr1);
4346 gcc_assert (lse.ss == gfc_ss_terminator
4347 && rse.ss == gfc_ss_terminator);
4349 tmp = gfc_trans_scalar_assign (&lse, &rse, expr1->ts,
4351 gfc_add_expr_to_block (&body, tmp);
4354 /* Generate the copying loops. */
4355 gfc_trans_scalarizing_loops (&loop, &body);
4357 /* Wrap the whole thing up. */
4358 gfc_add_block_to_block (&block, &loop.pre);
4359 gfc_add_block_to_block (&block, &loop.post);
4361 gfc_cleanup_loop (&loop);
4364 return gfc_finish_block (&block);
4368 /* Check whether EXPR is a copyable array. */
4371 copyable_array_p (gfc_expr * expr)
4373 if (expr->expr_type != EXPR_VARIABLE)
4376 /* First check it's an array. */
4377 if (expr->rank < 1 || !expr->ref || expr->ref->next)
4380 if (!gfc_full_array_ref_p (expr->ref))
4383 /* Next check that it's of a simple enough type. */
4384 switch (expr->ts.type)
4396 return !expr->ts.derived->attr.alloc_comp;
4405 /* Translate an assignment. */
4408 gfc_trans_assignment (gfc_expr * expr1, gfc_expr * expr2, bool init_flag)
4412 /* Special case a single function returning an array. */
4413 if (expr2->expr_type == EXPR_FUNCTION && expr2->rank > 0)
4415 tmp = gfc_trans_arrayfunc_assign (expr1, expr2);
4420 /* Special case assigning an array to zero. */
4421 if (copyable_array_p (expr1)
4422 && is_zero_initializer_p (expr2))
4424 tmp = gfc_trans_zero_assign (expr1);
4429 /* Special case copying one array to another. */
4430 if (copyable_array_p (expr1)
4431 && copyable_array_p (expr2)
4432 && gfc_compare_types (&expr1->ts, &expr2->ts)
4433 && !gfc_check_dependency (expr1, expr2, 0))
4435 tmp = gfc_trans_array_copy (expr1, expr2);
4440 /* Special case initializing an array from a constant array constructor. */
4441 if (copyable_array_p (expr1)
4442 && expr2->expr_type == EXPR_ARRAY
4443 && gfc_compare_types (&expr1->ts, &expr2->ts))
4445 tmp = gfc_trans_array_constructor_copy (expr1, expr2);
4450 /* Fallback to the scalarizer to generate explicit loops. */
4451 return gfc_trans_assignment_1 (expr1, expr2, init_flag);
4455 gfc_trans_init_assign (gfc_code * code)
4457 return gfc_trans_assignment (code->expr, code->expr2, true);
4461 gfc_trans_assign (gfc_code * code)
4463 return gfc_trans_assignment (code->expr, code->expr2, false);