1 /* Supporting functions for resolving DATA statement.
2 Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007
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 2, 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 COPYING. If not, write to the Free
20 Software Foundation, 51 Franklin Street, Fifth Floor,Boston, MA
24 /* Notes for DATA statement implementation:
26 We first assign initial value to each symbol by gfc_assign_data_value
27 during resolveing DATA statement. Refer to check_data_variable and
28 traverse_data_list in resolve.c.
30 The complexity exists in the handling of array section, implied do
31 and array of struct appeared in DATA statement.
33 We call gfc_conv_structure, gfc_con_array_array_initializer,
34 etc., to convert the initial value. Refer to trans-expr.c and
40 static void formalize_init_expr (gfc_expr
*);
42 /* Calculate the array element offset. */
45 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 re
= 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
);
81 /* Find if there is a constructor which offset is equal to OFFSET. */
83 static gfc_constructor
*
84 find_con_by_offset (splay_tree spt
, mpz_t offset
)
87 gfc_constructor
*ret
= NULL
;
91 /* The complexity is due to needing quick access to the linked list of
92 constructors. Both a linked list and a splay tree are used, and both
93 are kept up to date if they are array elements (which is the only time
94 that a specific constructor has to be found). */
96 gcc_assert (spt
!= NULL
);
99 sptn
= splay_tree_lookup (spt
, (splay_tree_key
) mpz_get_si (offset
));
102 ret
= (gfc_constructor
*) sptn
->value
;
105 /* Need to check and see if we match a range, so we will pull
106 the next lowest index and see if the range matches. */
107 sptn
= splay_tree_predecessor (spt
,
108 (splay_tree_key
) mpz_get_si (offset
));
111 con
= (gfc_constructor
*) sptn
->value
;
112 if (mpz_cmp_ui (con
->repeat
, 1) > 0)
115 mpz_add (tmp
, con
->n
.offset
, con
->repeat
);
116 if (mpz_cmp (offset
, tmp
) < 0)
121 ret
= NULL
; /* The range did not match. */
124 ret
= NULL
; /* No pred, so no match. */
131 /* Find if there is a constructor which component is equal to COM. */
133 static gfc_constructor
*
134 find_con_by_component (gfc_component
*com
, gfc_constructor
*con
)
136 for (; con
; con
= con
->next
)
138 if (com
== con
->n
.component
)
145 /* Create a character type initialization expression from RVALUE.
146 TS [and REF] describe [the substring of] the variable being initialized.
147 INIT is thh existing initializer, not NULL. Initialization is performed
148 according to normal assignment rules. */
151 create_character_intializer (gfc_expr
*init
, gfc_typespec
*ts
,
152 gfc_ref
*ref
, gfc_expr
*rvalue
)
159 gfc_extract_int (ts
->cl
->length
, &len
);
163 /* Create a new initializer. */
164 init
= gfc_get_expr ();
165 init
->expr_type
= EXPR_CONSTANT
;
168 dest
= gfc_getmem (len
+ 1);
170 init
->value
.character
.length
= len
;
171 init
->value
.character
.string
= dest
;
172 /* Blank the string if we're only setting a substring. */
174 memset (dest
, ' ', len
);
177 dest
= init
->value
.character
.string
;
181 gfc_expr
*start_expr
, *end_expr
;
183 gcc_assert (ref
->type
== REF_SUBSTRING
);
185 /* Only set a substring of the destination. Fortran substring bounds
186 are one-based [start, end], we want zero based [start, end). */
187 start_expr
= gfc_copy_expr (ref
->u
.ss
.start
);
188 end_expr
= gfc_copy_expr (ref
->u
.ss
.end
);
190 if ((gfc_simplify_expr (start_expr
, 1) == FAILURE
)
191 || (gfc_simplify_expr (end_expr
, 1)) == FAILURE
)
193 gfc_error ("failure to simplify substring reference in DATA "
194 "statement at %L", &ref
->u
.ss
.start
->where
);
198 gfc_extract_int (start_expr
, &start
);
200 gfc_extract_int (end_expr
, &end
);
204 /* Set the whole string. */
209 /* Copy the initial value. */
210 len
= rvalue
->value
.character
.length
;
211 if (len
> end
- start
)
214 gfc_warning_now ("initialization string truncated to match variable "
215 "at %L", &rvalue
->where
);
218 memcpy (&dest
[start
], rvalue
->value
.character
.string
, len
);
220 /* Pad with spaces. Substrings will already be blanked. */
221 if (len
< end
- start
&& ref
== NULL
)
222 memset (&dest
[start
+ len
], ' ', end
- (start
+ len
));
224 if (rvalue
->ts
.type
== BT_HOLLERITH
)
231 /* Assign the initial value RVALUE to LVALUE's symbol->value. If the
232 LVALUE already has an initialization, we extend this, otherwise we
236 gfc_assign_data_value (gfc_expr
*lvalue
, gfc_expr
*rvalue
, mpz_t index
)
241 gfc_constructor
*con
;
242 gfc_constructor
*last_con
;
243 gfc_constructor
*pred
;
245 gfc_typespec
*last_ts
;
248 splay_tree_node sptn
;
250 symbol
= lvalue
->symtree
->n
.sym
;
251 init
= symbol
->value
;
252 last_ts
= &symbol
->ts
;
254 mpz_init_set_si (offset
, 0);
256 /* Find/create the parent expressions for subobject references. */
257 for (ref
= lvalue
->ref
; ref
; ref
= ref
->next
)
259 /* Break out of the loop if we find a substring. */
260 if (ref
->type
== REF_SUBSTRING
)
262 /* A substring should always be the last subobject reference. */
263 gcc_assert (ref
->next
== NULL
);
267 /* Use the existing initializer expression if it exists. Otherwise
270 expr
= gfc_get_expr ();
274 /* Find or create this element. */
280 /* The element typespec will be the same as the array
283 /* Setup the expression to hold the constructor. */
284 expr
->expr_type
= EXPR_ARRAY
;
285 expr
->rank
= ref
->u
.ar
.as
->rank
;
288 gcc_assert (expr
->expr_type
== EXPR_ARRAY
);
290 if (ref
->u
.ar
.type
== AR_ELEMENT
)
291 get_array_index (&ref
->u
.ar
, &offset
);
293 mpz_set (offset
, index
);
295 /* Splay tree containing offset and gfc_constructor. */
296 spt
= expr
->con_by_offset
;
300 spt
= splay_tree_new (splay_tree_compare_ints
, NULL
, NULL
);
301 expr
->con_by_offset
= spt
;
305 con
= find_con_by_offset (spt
, offset
);
311 /* Create a new constructor. */
312 con
= gfc_get_constructor ();
313 mpz_set (con
->n
.offset
, offset
);
314 j
= (splay_tree_key
) mpz_get_si (offset
);
315 sptn
= splay_tree_insert (spt
, j
, (splay_tree_value
) con
);
316 /* Fix up the linked list. */
317 sptn
= splay_tree_predecessor (spt
, j
);
319 { /* Insert at the head. */
320 con
->next
= expr
->value
.constructor
;
321 expr
->value
.constructor
= con
;
324 { /* Insert in the chain. */
325 pred
= (gfc_constructor
*) sptn
->value
;
326 con
->next
= pred
->next
;
335 /* Setup the expression to hold the constructor. */
336 expr
->expr_type
= EXPR_STRUCTURE
;
337 expr
->ts
.type
= BT_DERIVED
;
338 expr
->ts
.derived
= ref
->u
.c
.sym
;
341 gcc_assert (expr
->expr_type
== EXPR_STRUCTURE
);
342 last_ts
= &ref
->u
.c
.component
->ts
;
344 /* Find the same element in the existing constructor. */
345 con
= expr
->value
.constructor
;
346 con
= find_con_by_component (ref
->u
.c
.component
, con
);
350 /* Create a new constructor. */
351 con
= gfc_get_constructor ();
352 con
->n
.component
= ref
->u
.c
.component
;
353 con
->next
= expr
->value
.constructor
;
354 expr
->value
.constructor
= con
;
364 /* Point the container at the new expression. */
365 if (last_con
== NULL
)
366 symbol
->value
= expr
;
368 last_con
->expr
= expr
;
374 if (ref
|| last_ts
->type
== BT_CHARACTER
)
375 expr
= create_character_intializer (init
, last_ts
, ref
, rvalue
);
378 /* Overwriting an existing initializer is non-standard but usually only
379 provokes a warning from other compilers. */
382 /* Order in which the expressions arrive here depends on whether
383 they are from data statements or F95 style declarations.
384 Therefore, check which is the most recent. */
385 #ifdef USE_MAPPED_LOCATION
386 expr
= (LOCATION_LINE (init
->where
.lb
->location
)
387 > LOCATION_LINE (rvalue
->where
.lb
->location
))
390 expr
= (init
->where
.lb
->linenum
> rvalue
->where
.lb
->linenum
)
393 gfc_notify_std (GFC_STD_GNU
, "Extension: re-initialization "
394 "of '%s' at %L", symbol
->name
, &expr
->where
);
397 expr
= gfc_copy_expr (rvalue
);
398 if (!gfc_compare_types (&lvalue
->ts
, &expr
->ts
))
399 gfc_convert_type (expr
, &lvalue
->ts
, 0);
402 if (last_con
== NULL
)
403 symbol
->value
= expr
;
405 last_con
->expr
= expr
;
409 /* Similarly, but initialize REPEAT consecutive values in LVALUE the same
410 value in RVALUE. For the nonce, LVALUE must refer to a full array, not
414 gfc_assign_data_value_range (gfc_expr
*lvalue
, gfc_expr
*rvalue
,
415 mpz_t index
, mpz_t repeat
)
418 gfc_expr
*init
, *expr
;
419 gfc_constructor
*con
, *last_con
;
420 gfc_constructor
*pred
;
422 gfc_typespec
*last_ts
;
425 splay_tree_node sptn
;
427 symbol
= lvalue
->symtree
->n
.sym
;
428 init
= symbol
->value
;
429 last_ts
= &symbol
->ts
;
431 mpz_init_set_si (offset
, 0);
433 /* Find/create the parent expressions for subobject references. */
434 for (ref
= lvalue
->ref
; ref
; ref
= ref
->next
)
436 /* Use the existing initializer expression if it exists.
437 Otherwise create a new one. */
439 expr
= gfc_get_expr ();
443 /* Find or create this element. */
449 /* The element typespec will be the same as the array
452 /* Setup the expression to hold the constructor. */
453 expr
->expr_type
= EXPR_ARRAY
;
454 expr
->rank
= ref
->u
.ar
.as
->rank
;
457 gcc_assert (expr
->expr_type
== EXPR_ARRAY
);
459 if (ref
->u
.ar
.type
== AR_ELEMENT
)
461 get_array_index (&ref
->u
.ar
, &offset
);
463 /* This had better not be the bottom of the reference.
464 We can still get to a full array via a component. */
465 gcc_assert (ref
->next
!= NULL
);
469 mpz_set (offset
, index
);
471 /* We're at a full array or an array section. This means
472 that we've better have found a full array, and that we're
473 at the bottom of the reference. */
474 gcc_assert (ref
->u
.ar
.type
== AR_FULL
);
475 gcc_assert (ref
->next
== NULL
);
478 /* Find the same element in the existing constructor. */
480 /* Splay tree containing offset and gfc_constructor. */
481 spt
= expr
->con_by_offset
;
485 spt
= splay_tree_new (splay_tree_compare_ints
, NULL
, NULL
);
486 expr
->con_by_offset
= spt
;
490 con
= find_con_by_offset (spt
, offset
);
495 /* Create a new constructor. */
496 con
= gfc_get_constructor ();
497 mpz_set (con
->n
.offset
, offset
);
498 j
= (splay_tree_key
) mpz_get_si (offset
);
500 if (ref
->next
== NULL
)
501 mpz_set (con
->repeat
, repeat
);
502 sptn
= splay_tree_insert (spt
, j
, (splay_tree_value
) con
);
503 /* Fix up the linked list. */
504 sptn
= splay_tree_predecessor (spt
, j
);
506 { /* Insert at the head. */
507 con
->next
= expr
->value
.constructor
;
508 expr
->value
.constructor
= con
;
511 { /* Insert in the chain. */
512 pred
= (gfc_constructor
*) sptn
->value
;
513 con
->next
= pred
->next
;
518 gcc_assert (ref
->next
!= NULL
);
524 /* Setup the expression to hold the constructor. */
525 expr
->expr_type
= EXPR_STRUCTURE
;
526 expr
->ts
.type
= BT_DERIVED
;
527 expr
->ts
.derived
= ref
->u
.c
.sym
;
530 gcc_assert (expr
->expr_type
== EXPR_STRUCTURE
);
531 last_ts
= &ref
->u
.c
.component
->ts
;
533 /* Find the same element in the existing constructor. */
534 con
= expr
->value
.constructor
;
535 con
= find_con_by_component (ref
->u
.c
.component
, con
);
539 /* Create a new constructor. */
540 con
= gfc_get_constructor ();
541 con
->n
.component
= ref
->u
.c
.component
;
542 con
->next
= expr
->value
.constructor
;
543 expr
->value
.constructor
= con
;
546 /* Since we're only intending to initialize arrays here,
547 there better be an inner reference. */
548 gcc_assert (ref
->next
!= NULL
);
558 /* Point the container at the new expression. */
559 if (last_con
== NULL
)
560 symbol
->value
= expr
;
562 last_con
->expr
= expr
;
568 if (last_ts
->type
== BT_CHARACTER
)
569 expr
= create_character_intializer (init
, last_ts
, NULL
, rvalue
);
572 /* We should never be overwriting an existing initializer. */
575 expr
= gfc_copy_expr (rvalue
);
576 if (!gfc_compare_types (&lvalue
->ts
, &expr
->ts
))
577 gfc_convert_type (expr
, &lvalue
->ts
, 0);
580 if (last_con
== NULL
)
581 symbol
->value
= expr
;
583 last_con
->expr
= expr
;
586 /* Modify the index of array section and re-calculate the array offset. */
589 gfc_advance_section (mpz_t
*section_index
, gfc_array_ref
*ar
,
598 for (i
= 0; i
< ar
->dimen
; i
++)
600 if (ar
->dimen_type
[i
] != DIMEN_RANGE
)
605 mpz_add (section_index
[i
], section_index
[i
],
606 ar
->stride
[i
]->value
.integer
);
607 if (mpz_cmp_si (ar
->stride
[i
]->value
.integer
, 0) >= 0)
614 mpz_add_ui (section_index
[i
], section_index
[i
], 1);
619 cmp
= mpz_cmp (section_index
[i
], ar
->end
[i
]->value
.integer
);
621 cmp
= mpz_cmp (section_index
[i
], ar
->as
->upper
[i
]->value
.integer
);
623 if ((cmp
> 0 && forwards
) || (cmp
< 0 && !forwards
))
625 /* Reset index to start, then loop to advance the next index. */
627 mpz_set (section_index
[i
], ar
->start
[i
]->value
.integer
);
629 mpz_set (section_index
[i
], ar
->as
->lower
[i
]->value
.integer
);
635 mpz_set_si (*offset_ret
, 0);
636 mpz_init_set_si (delta
, 1);
638 for (i
= 0; i
< ar
->dimen
; i
++)
640 mpz_sub (tmp
, section_index
[i
], ar
->as
->lower
[i
]->value
.integer
);
641 mpz_mul (tmp
, tmp
, delta
);
642 mpz_add (*offset_ret
, tmp
, *offset_ret
);
644 mpz_sub (tmp
, ar
->as
->upper
[i
]->value
.integer
,
645 ar
->as
->lower
[i
]->value
.integer
);
646 mpz_add_ui (tmp
, tmp
, 1);
647 mpz_mul (delta
, tmp
, delta
);
654 /* Rearrange a structure constructor so the elements are in the specified
655 order. Also insert NULL entries if necessary. */
658 formalize_structure_cons (gfc_expr
*expr
)
660 gfc_constructor
*head
;
661 gfc_constructor
*tail
;
662 gfc_constructor
*cur
;
663 gfc_constructor
*last
;
665 gfc_component
*order
;
667 c
= expr
->value
.constructor
;
669 /* Constructor is already formalized. */
670 if (c
->n
.component
== NULL
)
674 for (order
= expr
->ts
.derived
->components
; order
; order
= order
->next
)
676 /* Find the next component. */
679 while (cur
!= NULL
&& cur
->n
.component
!= order
)
687 /* Create a new one. */
688 cur
= gfc_get_constructor ();
692 /* Remove it from the chain. */
696 last
->next
= cur
->next
;
699 formalize_init_expr (cur
->expr
);
702 /* Add it to the new constructor. */
711 gcc_assert (c
== NULL
);
712 expr
->value
.constructor
= head
;
716 /* Make sure an initialization expression is in normalized form. Ie. all
717 elements of the constructors are in the correct order. */
720 formalize_init_expr (gfc_expr
*expr
)
728 type
= expr
->expr_type
;
732 c
= expr
->value
.constructor
;
735 formalize_init_expr (c
->expr
);
741 formalize_structure_cons (expr
);
750 /* Resolve symbol's initial value after all data statement. */
753 gfc_formalize_init_value (gfc_symbol
*sym
)
755 formalize_init_expr (sym
->value
);
759 /* Get the integer value into RET_AS and SECTION from AS and AR, and return
763 gfc_get_section_index (gfc_array_ref
*ar
, mpz_t
*section_index
, mpz_t
*offset
)
769 mpz_set_si (*offset
, 0);
771 mpz_init_set_si (delta
, 1);
772 for (i
= 0; i
< ar
->dimen
; i
++)
774 mpz_init (section_index
[i
]);
775 switch (ar
->dimen_type
[i
])
781 mpz_sub (tmp
, ar
->start
[i
]->value
.integer
,
782 ar
->as
->lower
[i
]->value
.integer
);
783 mpz_mul (tmp
, tmp
, delta
);
784 mpz_add (*offset
, tmp
, *offset
);
785 mpz_set (section_index
[i
], ar
->start
[i
]->value
.integer
);
788 mpz_set (section_index
[i
], ar
->as
->lower
[i
]->value
.integer
);
792 gfc_internal_error ("TODO: Vector sections in data statements");
798 mpz_sub (tmp
, ar
->as
->upper
[i
]->value
.integer
,
799 ar
->as
->lower
[i
]->value
.integer
);
800 mpz_add_ui (tmp
, tmp
, 1);
801 mpz_mul (delta
, tmp
, delta
);