1 /* Supporting functions for resolving DATA statement.
2 Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
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
39 #include "constructor.h"
41 static void formalize_init_expr (gfc_expr *);
43 /* Calculate the array element offset. */
46 get_array_index (gfc_array_ref *ar, mpz_t *offset)
54 mpz_set_si (*offset, 0);
55 mpz_init_set_si (delta, 1);
56 for (i = 0; i < ar->dimen; i++)
58 e = gfc_copy_expr (ar->start[i]);
59 gfc_simplify_expr (e, 1);
61 if ((gfc_is_constant_expr (ar->as->lower[i]) == 0)
62 || (gfc_is_constant_expr (ar->as->upper[i]) == 0)
63 || (gfc_is_constant_expr (e) == 0))
64 gfc_error ("non-constant array in DATA statement %L", &ar->where);
66 mpz_set (tmp, e->value.integer);
67 mpz_sub (tmp, tmp, ar->as->lower[i]->value.integer);
68 mpz_mul (tmp, tmp, delta);
69 mpz_add (*offset, tmp, *offset);
71 mpz_sub (tmp, ar->as->upper[i]->value.integer,
72 ar->as->lower[i]->value.integer);
73 mpz_add_ui (tmp, tmp, 1);
74 mpz_mul (delta, tmp, delta);
80 /* Find if there is a constructor which component is equal to COM.
81 TODO: remove this, use symbol.c(gfc_find_component) instead. */
83 static gfc_constructor *
84 find_con_by_component (gfc_component *com, gfc_constructor_base base)
88 for (c = gfc_constructor_first (base); c; c = gfc_constructor_next (c))
89 if (com == c->n.component)
96 /* Create a character type initialization expression from RVALUE.
97 TS [and REF] describe [the substring of] the variable being initialized.
98 INIT is the existing initializer, not NULL. Initialization is performed
99 according to normal assignment rules. */
102 create_character_intializer (gfc_expr *init, gfc_typespec *ts,
103 gfc_ref *ref, gfc_expr *rvalue)
108 gfc_extract_int (ts->u.cl->length, &len);
112 /* Create a new initializer. */
113 init = gfc_get_character_expr (ts->kind, NULL, NULL, len);
117 dest = init->value.character.string;
121 gfc_expr *start_expr, *end_expr;
123 gcc_assert (ref->type == REF_SUBSTRING);
125 /* Only set a substring of the destination. Fortran substring bounds
126 are one-based [start, end], we want zero based [start, end). */
127 start_expr = gfc_copy_expr (ref->u.ss.start);
128 end_expr = gfc_copy_expr (ref->u.ss.end);
130 if ((gfc_simplify_expr (start_expr, 1) == FAILURE)
131 || (gfc_simplify_expr (end_expr, 1)) == FAILURE)
133 gfc_error ("failure to simplify substring reference in DATA "
134 "statement at %L", &ref->u.ss.start->where);
138 gfc_extract_int (start_expr, &start);
140 gfc_extract_int (end_expr, &end);
144 /* Set the whole string. */
149 /* Copy the initial value. */
150 if (rvalue->ts.type == BT_HOLLERITH)
151 len = rvalue->representation.length;
153 len = rvalue->value.character.length;
155 if (len > end - start)
158 gfc_warning_now ("initialization string truncated to match variable "
159 "at %L", &rvalue->where);
162 if (rvalue->ts.type == BT_HOLLERITH)
165 for (i = 0; i < len; i++)
166 dest[start+i] = rvalue->representation.string[i];
169 memcpy (&dest[start], rvalue->value.character.string,
170 len * sizeof (gfc_char_t));
172 /* Pad with spaces. Substrings will already be blanked. */
173 if (len < end - start && ref == NULL)
174 gfc_wide_memset (&dest[start + len], ' ', end - (start + len));
176 if (rvalue->ts.type == BT_HOLLERITH)
178 init->representation.length = init->value.character.length;
179 init->representation.string
180 = gfc_widechar_to_char (init->value.character.string,
181 init->value.character.length);
188 /* Assign the initial value RVALUE to LVALUE's symbol->value. If the
189 LVALUE already has an initialization, we extend this, otherwise we
193 gfc_assign_data_value (gfc_expr *lvalue, gfc_expr *rvalue, mpz_t index)
198 gfc_constructor *con;
199 gfc_constructor *last_con;
201 gfc_typespec *last_ts;
204 symbol = lvalue->symtree->n.sym;
205 init = symbol->value;
206 last_ts = &symbol->ts;
208 mpz_init_set_si (offset, 0);
210 /* Find/create the parent expressions for subobject references. */
211 for (ref = lvalue->ref; ref; ref = ref->next)
213 /* Break out of the loop if we find a substring. */
214 if (ref->type == REF_SUBSTRING)
216 /* A substring should always be the last subobject reference. */
217 gcc_assert (ref->next == NULL);
221 /* Use the existing initializer expression if it exists. Otherwise
224 expr = gfc_get_expr ();
228 /* Find or create this element. */
232 if (ref->u.ar.as->rank == 0)
234 gcc_assert (ref->u.ar.as->corank > 0);
240 if (init && expr->expr_type != EXPR_ARRAY)
242 gfc_error ("'%s' at %L already is initialized at %L",
243 lvalue->symtree->n.sym->name, &lvalue->where,
250 /* The element typespec will be the same as the array
253 /* Setup the expression to hold the constructor. */
254 expr->expr_type = EXPR_ARRAY;
255 expr->rank = ref->u.ar.as->rank;
258 if (ref->u.ar.type == AR_ELEMENT)
259 get_array_index (&ref->u.ar, &offset);
261 mpz_set (offset, index);
263 /* Check the bounds. */
264 if (mpz_cmp_si (offset, 0) < 0)
266 gfc_error ("Data element below array lower bound at %L",
273 if (spec_size (ref->u.ar.as, &size) == SUCCESS)
275 if (mpz_cmp (offset, size) >= 0)
278 gfc_error ("Data element above array upper bound at %L",
286 con = gfc_constructor_lookup (expr->value.constructor,
287 mpz_get_si (offset));
290 con = gfc_constructor_insert_expr (&expr->value.constructor,
291 NULL, &rvalue->where,
292 mpz_get_si (offset));
299 /* Setup the expression to hold the constructor. */
300 expr->expr_type = EXPR_STRUCTURE;
301 expr->ts.type = BT_DERIVED;
302 expr->ts.u.derived = ref->u.c.sym;
305 gcc_assert (expr->expr_type == EXPR_STRUCTURE);
306 last_ts = &ref->u.c.component->ts;
308 /* Find the same element in the existing constructor. */
309 con = find_con_by_component (ref->u.c.component,
310 expr->value.constructor);
314 /* Create a new constructor. */
315 con = gfc_constructor_append_expr (&expr->value.constructor,
317 con->n.component = ref->u.c.component;
327 /* Point the container at the new expression. */
328 if (last_con == NULL)
329 symbol->value = expr;
331 last_con->expr = expr;
337 if (ref || last_ts->type == BT_CHARACTER)
339 if (lvalue->ts.u.cl->length == NULL && !(ref && ref->u.ss.length != NULL))
341 expr = create_character_intializer (init, last_ts, ref, rvalue);
345 /* Overwriting an existing initializer is non-standard but usually only
346 provokes a warning from other compilers. */
349 /* Order in which the expressions arrive here depends on whether
350 they are from data statements or F95 style declarations.
351 Therefore, check which is the most recent. */
352 expr = (LOCATION_LINE (init->where.lb->location)
353 > LOCATION_LINE (rvalue->where.lb->location))
355 if (gfc_notify_std (GFC_STD_GNU,"Extension: "
356 "re-initialization of '%s' at %L",
357 symbol->name, &expr->where) == FAILURE)
361 expr = gfc_copy_expr (rvalue);
362 if (!gfc_compare_types (&lvalue->ts, &expr->ts))
363 gfc_convert_type (expr, &lvalue->ts, 0);
366 if (last_con == NULL)
367 symbol->value = expr;
369 last_con->expr = expr;
375 /* Similarly, but initialize REPEAT consecutive values in LVALUE the same
379 gfc_assign_data_value_range (gfc_expr *lvalue, gfc_expr *rvalue,
380 mpz_t index, mpz_t repeat)
382 mpz_t offset, last_offset;
386 mpz_init (last_offset);
387 mpz_add (last_offset, index, repeat);
390 for (mpz_set(offset, index) ; mpz_cmp(offset, last_offset) < 0;
391 mpz_add_ui (offset, offset, 1))
392 if (gfc_assign_data_value (lvalue, rvalue, offset) == FAILURE)
399 mpz_clear (last_offset);
405 /* Modify the index of array section and re-calculate the array offset. */
408 gfc_advance_section (mpz_t *section_index, gfc_array_ref *ar,
417 for (i = 0; i < ar->dimen; i++)
419 if (ar->dimen_type[i] != DIMEN_RANGE)
424 mpz_add (section_index[i], section_index[i],
425 ar->stride[i]->value.integer);
426 if (mpz_cmp_si (ar->stride[i]->value.integer, 0) >= 0)
433 mpz_add_ui (section_index[i], section_index[i], 1);
438 cmp = mpz_cmp (section_index[i], ar->end[i]->value.integer);
440 cmp = mpz_cmp (section_index[i], ar->as->upper[i]->value.integer);
442 if ((cmp > 0 && forwards) || (cmp < 0 && !forwards))
444 /* Reset index to start, then loop to advance the next index. */
446 mpz_set (section_index[i], ar->start[i]->value.integer);
448 mpz_set (section_index[i], ar->as->lower[i]->value.integer);
454 mpz_set_si (*offset_ret, 0);
455 mpz_init_set_si (delta, 1);
457 for (i = 0; i < ar->dimen; i++)
459 mpz_sub (tmp, section_index[i], ar->as->lower[i]->value.integer);
460 mpz_mul (tmp, tmp, delta);
461 mpz_add (*offset_ret, tmp, *offset_ret);
463 mpz_sub (tmp, ar->as->upper[i]->value.integer,
464 ar->as->lower[i]->value.integer);
465 mpz_add_ui (tmp, tmp, 1);
466 mpz_mul (delta, tmp, delta);
473 /* Rearrange a structure constructor so the elements are in the specified
474 order. Also insert NULL entries if necessary. */
477 formalize_structure_cons (gfc_expr *expr)
479 gfc_constructor_base base = NULL;
480 gfc_constructor *cur;
481 gfc_component *order;
483 /* Constructor is already formalized. */
484 cur = gfc_constructor_first (expr->value.constructor);
485 if (!cur || cur->n.component == NULL)
488 for (order = expr->ts.u.derived->components; order; order = order->next)
490 cur = find_con_by_component (order, expr->value.constructor);
492 gfc_constructor_append_expr (&base, cur->expr, &cur->expr->where);
494 gfc_constructor_append_expr (&base, NULL, NULL);
497 /* For all what it's worth, one would expect
498 gfc_constructor_free (expr->value.constructor);
499 here. However, if the constructor is actually free'd,
500 hell breaks loose in the testsuite?! */
502 expr->value.constructor = base;
506 /* Make sure an initialization expression is in normalized form, i.e., all
507 elements of the constructors are in the correct order. */
510 formalize_init_expr (gfc_expr *expr)
518 type = expr->expr_type;
522 for (c = gfc_constructor_first (expr->value.constructor);
523 c; c = gfc_constructor_next (c))
524 formalize_init_expr (c->expr);
529 formalize_structure_cons (expr);
538 /* Resolve symbol's initial value after all data statement. */
541 gfc_formalize_init_value (gfc_symbol *sym)
543 formalize_init_expr (sym->value);
547 /* Get the integer value into RET_AS and SECTION from AS and AR, and return
551 gfc_get_section_index (gfc_array_ref *ar, mpz_t *section_index, mpz_t *offset)
557 mpz_set_si (*offset, 0);
559 mpz_init_set_si (delta, 1);
560 for (i = 0; i < ar->dimen; i++)
562 mpz_init (section_index[i]);
563 switch (ar->dimen_type[i])
569 mpz_sub (tmp, ar->start[i]->value.integer,
570 ar->as->lower[i]->value.integer);
571 mpz_mul (tmp, tmp, delta);
572 mpz_add (*offset, tmp, *offset);
573 mpz_set (section_index[i], ar->start[i]->value.integer);
576 mpz_set (section_index[i], ar->as->lower[i]->value.integer);
580 gfc_internal_error ("TODO: Vector sections in data statements");
586 mpz_sub (tmp, ar->as->upper[i]->value.integer,
587 ar->as->lower[i]->value.integer);
588 mpz_add_ui (tmp, tmp, 1);
589 mpz_mul (delta, tmp, delta);