1 /* Supporting functions for resolving DATA statement.
2 Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011
3 Free Software Foundation, Inc.
4 Contributed by Lifang Zeng <zlf605@hotmail.com>
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 3, or (at your option) any later
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
23 /* Notes for DATA statement implementation:
25 We first assign initial value to each symbol by gfc_assign_data_value
26 during resolving DATA statement. Refer to check_data_variable and
27 traverse_data_list in resolve.c.
29 The complexity exists in the handling of array section, implied do
30 and array of struct appeared in DATA statement.
32 We call gfc_conv_structure, gfc_con_array_array_initializer,
33 etc., to convert the initial value. Refer to trans-expr.c and
40 #include "constructor.h"
42 static void formalize_init_expr (gfc_expr *);
44 /* Calculate the array element offset. */
47 get_array_index (gfc_array_ref *ar, mpz_t *offset)
55 mpz_set_si (*offset, 0);
56 mpz_init_set_si (delta, 1);
57 for (i = 0; i < ar->dimen; i++)
59 e = gfc_copy_expr (ar->start[i]);
60 gfc_simplify_expr (e, 1);
62 if ((gfc_is_constant_expr (ar->as->lower[i]) == 0)
63 || (gfc_is_constant_expr (ar->as->upper[i]) == 0)
64 || (gfc_is_constant_expr (e) == 0))
65 gfc_error ("non-constant array in DATA statement %L", &ar->where);
67 mpz_set (tmp, e->value.integer);
68 mpz_sub (tmp, tmp, ar->as->lower[i]->value.integer);
69 mpz_mul (tmp, tmp, delta);
70 mpz_add (*offset, tmp, *offset);
72 mpz_sub (tmp, ar->as->upper[i]->value.integer,
73 ar->as->lower[i]->value.integer);
74 mpz_add_ui (tmp, tmp, 1);
75 mpz_mul (delta, tmp, delta);
81 /* Find if there is a constructor which component is equal to COM.
82 TODO: remove this, use symbol.c(gfc_find_component) instead. */
84 static gfc_constructor *
85 find_con_by_component (gfc_component *com, gfc_constructor_base base)
89 for (c = gfc_constructor_first (base); c; c = gfc_constructor_next (c))
90 if (com == c->n.component)
97 /* Create a character type initialization expression from RVALUE.
98 TS [and REF] describe [the substring of] the variable being initialized.
99 INIT is the existing initializer, not NULL. Initialization is performed
100 according to normal assignment rules. */
103 create_character_initializer (gfc_expr *init, gfc_typespec *ts,
104 gfc_ref *ref, gfc_expr *rvalue)
109 gfc_extract_int (ts->u.cl->length, &len);
113 /* Create a new initializer. */
114 init = gfc_get_character_expr (ts->kind, NULL, NULL, len);
118 dest = init->value.character.string;
122 gfc_expr *start_expr, *end_expr;
124 gcc_assert (ref->type == REF_SUBSTRING);
126 /* Only set a substring of the destination. Fortran substring bounds
127 are one-based [start, end], we want zero based [start, end). */
128 start_expr = gfc_copy_expr (ref->u.ss.start);
129 end_expr = gfc_copy_expr (ref->u.ss.end);
131 if ((gfc_simplify_expr (start_expr, 1) == FAILURE)
132 || (gfc_simplify_expr (end_expr, 1)) == FAILURE)
134 gfc_error ("failure to simplify substring reference in DATA "
135 "statement at %L", &ref->u.ss.start->where);
139 gfc_extract_int (start_expr, &start);
141 gfc_extract_int (end_expr, &end);
145 /* Set the whole string. */
150 /* Copy the initial value. */
151 if (rvalue->ts.type == BT_HOLLERITH)
152 len = rvalue->representation.length - rvalue->ts.u.pad;
154 len = rvalue->value.character.length;
156 if (len > end - start)
158 gfc_warning_now ("Initialization string starting at %L was "
159 "truncated to fit the variable (%d/%d)",
160 &rvalue->where, end - start, len);
164 if (rvalue->ts.type == BT_HOLLERITH)
167 for (i = 0; i < len; i++)
168 dest[start+i] = rvalue->representation.string[i];
171 memcpy (&dest[start], rvalue->value.character.string,
172 len * sizeof (gfc_char_t));
174 /* Pad with spaces. Substrings will already be blanked. */
175 if (len < end - start && ref == NULL)
176 gfc_wide_memset (&dest[start + len], ' ', end - (start + len));
178 if (rvalue->ts.type == BT_HOLLERITH)
180 init->representation.length = init->value.character.length;
181 init->representation.string
182 = gfc_widechar_to_char (init->value.character.string,
183 init->value.character.length);
190 /* Assign the initial value RVALUE to LVALUE's symbol->value. If the
191 LVALUE already has an initialization, we extend this, otherwise we
192 create a new one. If REPEAT is non-NULL, initialize *REPEAT
193 consecutive values in LVALUE the same value in RVALUE. In that case,
194 LVALUE must refer to a full array, not an array section. */
197 gfc_assign_data_value (gfc_expr *lvalue, gfc_expr *rvalue, mpz_t index,
203 gfc_constructor *con;
204 gfc_constructor *last_con;
206 gfc_typespec *last_ts;
209 symbol = lvalue->symtree->n.sym;
210 init = symbol->value;
211 last_ts = &symbol->ts;
213 mpz_init_set_si (offset, 0);
215 /* Find/create the parent expressions for subobject references. */
216 for (ref = lvalue->ref; ref; ref = ref->next)
218 /* Break out of the loop if we find a substring. */
219 if (ref->type == REF_SUBSTRING)
221 /* A substring should always be the last subobject reference. */
222 gcc_assert (ref->next == NULL);
226 /* Use the existing initializer expression if it exists. Otherwise
229 expr = gfc_get_expr ();
233 /* Find or create this element. */
237 if (ref->u.ar.as->rank == 0)
239 gcc_assert (ref->u.ar.as->corank > 0);
245 if (init && expr->expr_type != EXPR_ARRAY)
247 gfc_error ("'%s' at %L already is initialized at %L",
248 lvalue->symtree->n.sym->name, &lvalue->where,
255 /* The element typespec will be the same as the array
258 /* Setup the expression to hold the constructor. */
259 expr->expr_type = EXPR_ARRAY;
260 expr->rank = ref->u.ar.as->rank;
263 if (ref->u.ar.type == AR_ELEMENT)
264 get_array_index (&ref->u.ar, &offset);
266 mpz_set (offset, index);
268 /* Check the bounds. */
269 if (mpz_cmp_si (offset, 0) < 0)
271 gfc_error ("Data element below array lower bound at %L",
275 else if (repeat != NULL
276 && ref->u.ar.type != AR_ELEMENT)
279 gcc_assert (ref->u.ar.type == AR_FULL
280 && ref->next == NULL);
281 mpz_init_set (end, offset);
282 mpz_add (end, end, *repeat);
283 if (spec_size (ref->u.ar.as, &size) == SUCCESS)
285 if (mpz_cmp (end, size) > 0)
288 gfc_error ("Data element above array upper bound at %L",
295 con = gfc_constructor_lookup (expr->value.constructor,
296 mpz_get_si (offset));
299 con = gfc_constructor_lookup_next (expr->value.constructor,
300 mpz_get_si (offset));
301 if (con != NULL && mpz_cmp (con->offset, end) >= 0)
305 /* Overwriting an existing initializer is non-standard but
306 usually only provokes a warning from other compilers. */
307 if (con != NULL && con->expr != NULL)
309 /* Order in which the expressions arrive here depends on
310 whether they are from data statements or F95 style
311 declarations. Therefore, check which is the most
314 exprd = (LOCATION_LINE (con->expr->where.lb->location)
315 > LOCATION_LINE (rvalue->where.lb->location))
316 ? con->expr : rvalue;
317 if (gfc_notify_std (GFC_STD_GNU,"Extension: "
318 "re-initialization of '%s' at %L",
319 symbol->name, &exprd->where) == FAILURE)
325 gfc_constructor *next_con = gfc_constructor_next (con);
327 if (mpz_cmp (con->offset, end) >= 0)
329 if (mpz_cmp (con->offset, offset) < 0)
331 gcc_assert (mpz_cmp_si (con->repeat, 1) > 0);
332 mpz_sub (con->repeat, offset, con->offset);
334 else if (mpz_cmp_si (con->repeat, 1) > 0
335 && mpz_get_si (con->offset)
336 + mpz_get_si (con->repeat) > mpz_get_si (end))
340 = splay_tree_lookup (con->base,
341 mpz_get_si (con->offset));
343 && con == (gfc_constructor *) node->value
344 && node->key == (splay_tree_key)
345 mpz_get_si (con->offset));
346 endi = mpz_get_si (con->offset)
347 + mpz_get_si (con->repeat);
348 if (endi > mpz_get_si (end) + 1)
349 mpz_set_si (con->repeat, endi - mpz_get_si (end));
351 mpz_set_si (con->repeat, 1);
352 mpz_set (con->offset, end);
353 node->key = (splay_tree_key) mpz_get_si (end);
357 gfc_constructor_remove (con);
361 con = gfc_constructor_insert_expr (&expr->value.constructor,
362 NULL, &rvalue->where,
363 mpz_get_si (offset));
364 mpz_set (con->repeat, *repeat);
372 if (spec_size (ref->u.ar.as, &size) == SUCCESS)
374 if (mpz_cmp (offset, size) >= 0)
377 gfc_error ("Data element above array upper bound at %L",
385 con = gfc_constructor_lookup (expr->value.constructor,
386 mpz_get_si (offset));
389 con = gfc_constructor_insert_expr (&expr->value.constructor,
390 NULL, &rvalue->where,
391 mpz_get_si (offset));
393 else if (mpz_cmp_si (con->repeat, 1) > 0)
395 /* Need to split a range. */
396 if (mpz_cmp (con->offset, offset) < 0)
398 gfc_constructor *pred_con = con;
399 con = gfc_constructor_insert_expr (&expr->value.constructor,
401 mpz_get_si (offset));
402 con->expr = gfc_copy_expr (pred_con->expr);
403 mpz_add (con->repeat, pred_con->offset, pred_con->repeat);
404 mpz_sub (con->repeat, con->repeat, offset);
405 mpz_sub (pred_con->repeat, offset, pred_con->offset);
407 if (mpz_cmp_si (con->repeat, 1) > 0)
409 gfc_constructor *succ_con;
411 = gfc_constructor_insert_expr (&expr->value.constructor,
413 mpz_get_si (offset) + 1);
414 succ_con->expr = gfc_copy_expr (con->expr);
415 mpz_sub_ui (succ_con->repeat, con->repeat, 1);
416 mpz_set_si (con->repeat, 1);
424 /* Setup the expression to hold the constructor. */
425 expr->expr_type = EXPR_STRUCTURE;
426 expr->ts.type = BT_DERIVED;
427 expr->ts.u.derived = ref->u.c.sym;
430 gcc_assert (expr->expr_type == EXPR_STRUCTURE);
431 last_ts = &ref->u.c.component->ts;
433 /* Find the same element in the existing constructor. */
434 con = find_con_by_component (ref->u.c.component,
435 expr->value.constructor);
439 /* Create a new constructor. */
440 con = gfc_constructor_append_expr (&expr->value.constructor,
442 con->n.component = ref->u.c.component;
452 /* Point the container at the new expression. */
453 if (last_con == NULL)
454 symbol->value = expr;
456 last_con->expr = expr;
463 gcc_assert (repeat == NULL);
465 if (ref || last_ts->type == BT_CHARACTER)
467 if (lvalue->ts.u.cl->length == NULL && !(ref && ref->u.ss.length != NULL))
469 expr = create_character_initializer (init, last_ts, ref, rvalue);
473 /* Overwriting an existing initializer is non-standard but usually only
474 provokes a warning from other compilers. */
477 /* Order in which the expressions arrive here depends on whether
478 they are from data statements or F95 style declarations.
479 Therefore, check which is the most recent. */
480 expr = (LOCATION_LINE (init->where.lb->location)
481 > LOCATION_LINE (rvalue->where.lb->location))
483 if (gfc_notify_std (GFC_STD_GNU,"Extension: "
484 "re-initialization of '%s' at %L",
485 symbol->name, &expr->where) == FAILURE)
489 expr = gfc_copy_expr (rvalue);
490 if (!gfc_compare_types (&lvalue->ts, &expr->ts))
491 gfc_convert_type (expr, &lvalue->ts, 0);
494 if (last_con == NULL)
495 symbol->value = expr;
497 last_con->expr = expr;
507 /* Modify the index of array section and re-calculate the array offset. */
510 gfc_advance_section (mpz_t *section_index, gfc_array_ref *ar,
519 for (i = 0; i < ar->dimen; i++)
521 if (ar->dimen_type[i] != DIMEN_RANGE)
526 mpz_add (section_index[i], section_index[i],
527 ar->stride[i]->value.integer);
528 if (mpz_cmp_si (ar->stride[i]->value.integer, 0) >= 0)
535 mpz_add_ui (section_index[i], section_index[i], 1);
540 cmp = mpz_cmp (section_index[i], ar->end[i]->value.integer);
542 cmp = mpz_cmp (section_index[i], ar->as->upper[i]->value.integer);
544 if ((cmp > 0 && forwards) || (cmp < 0 && !forwards))
546 /* Reset index to start, then loop to advance the next index. */
548 mpz_set (section_index[i], ar->start[i]->value.integer);
550 mpz_set (section_index[i], ar->as->lower[i]->value.integer);
556 mpz_set_si (*offset_ret, 0);
557 mpz_init_set_si (delta, 1);
559 for (i = 0; i < ar->dimen; i++)
561 mpz_sub (tmp, section_index[i], ar->as->lower[i]->value.integer);
562 mpz_mul (tmp, tmp, delta);
563 mpz_add (*offset_ret, tmp, *offset_ret);
565 mpz_sub (tmp, ar->as->upper[i]->value.integer,
566 ar->as->lower[i]->value.integer);
567 mpz_add_ui (tmp, tmp, 1);
568 mpz_mul (delta, tmp, delta);
575 /* Rearrange a structure constructor so the elements are in the specified
576 order. Also insert NULL entries if necessary. */
579 formalize_structure_cons (gfc_expr *expr)
581 gfc_constructor_base base = NULL;
582 gfc_constructor *cur;
583 gfc_component *order;
585 /* Constructor is already formalized. */
586 cur = gfc_constructor_first (expr->value.constructor);
587 if (!cur || cur->n.component == NULL)
590 for (order = expr->ts.u.derived->components; order; order = order->next)
592 cur = find_con_by_component (order, expr->value.constructor);
594 gfc_constructor_append_expr (&base, cur->expr, &cur->expr->where);
596 gfc_constructor_append_expr (&base, NULL, NULL);
599 /* For all what it's worth, one would expect
600 gfc_constructor_free (expr->value.constructor);
601 here. However, if the constructor is actually free'd,
602 hell breaks loose in the testsuite?! */
604 expr->value.constructor = base;
608 /* Make sure an initialization expression is in normalized form, i.e., all
609 elements of the constructors are in the correct order. */
612 formalize_init_expr (gfc_expr *expr)
620 type = expr->expr_type;
624 for (c = gfc_constructor_first (expr->value.constructor);
625 c; c = gfc_constructor_next (c))
626 formalize_init_expr (c->expr);
631 formalize_structure_cons (expr);
640 /* Resolve symbol's initial value after all data statement. */
643 gfc_formalize_init_value (gfc_symbol *sym)
645 formalize_init_expr (sym->value);
649 /* Get the integer value into RET_AS and SECTION from AS and AR, and return
653 gfc_get_section_index (gfc_array_ref *ar, mpz_t *section_index, mpz_t *offset)
659 mpz_set_si (*offset, 0);
661 mpz_init_set_si (delta, 1);
662 for (i = 0; i < ar->dimen; i++)
664 mpz_init (section_index[i]);
665 switch (ar->dimen_type[i])
671 mpz_sub (tmp, ar->start[i]->value.integer,
672 ar->as->lower[i]->value.integer);
673 mpz_mul (tmp, tmp, delta);
674 mpz_add (*offset, tmp, *offset);
675 mpz_set (section_index[i], ar->start[i]->value.integer);
678 mpz_set (section_index[i], ar->as->lower[i]->value.integer);
682 gfc_internal_error ("TODO: Vector sections in data statements");
688 mpz_sub (tmp, ar->as->upper[i]->value.integer,
689 ar->as->lower[i]->value.integer);
690 mpz_add_ui (tmp, tmp, 1);
691 mpz_mul (delta, tmp, delta);