1 /* Simulate storage of variables into target memory.
2 Copyright (C) 2007-2013 Free Software Foundation, Inc.
3 Contributed by Paul Thomas and Brooks Moses
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 3, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING3. If not see
19 <http://www.gnu.org/licenses/>. */
23 #include "coretypes.h"
29 #include "constructor.h"
31 #include "trans-const.h"
32 #include "trans-types.h"
33 #include "target-memory.h"
35 /* --------------------------------------------------------------- */
36 /* Calculate the size of an expression. */
39 size_array (gfc_expr
*e
)
42 gfc_constructor
*c
= gfc_constructor_first (e
->value
.constructor
);
43 size_t elt_size
= gfc_target_expr_size (c
->expr
);
45 gfc_array_size (e
, &array_size
);
46 return (size_t)mpz_get_ui (array_size
) * elt_size
;
50 size_integer (int kind
)
52 return GET_MODE_SIZE (TYPE_MODE (gfc_get_int_type (kind
)));;
59 return GET_MODE_SIZE (TYPE_MODE (gfc_get_real_type (kind
)));;
64 size_complex (int kind
)
66 return 2 * size_float (kind
);
71 size_logical (int kind
)
73 return GET_MODE_SIZE (TYPE_MODE (gfc_get_logical_type (kind
)));;
78 size_character (int length
, int kind
)
80 int i
= gfc_validate_kind (BT_CHARACTER
, kind
, false);
81 return length
* gfc_character_kinds
[i
].bit_size
/ 8;
86 gfc_target_expr_size (gfc_expr
*e
)
90 gcc_assert (e
!= NULL
);
92 if (e
->expr_type
== EXPR_ARRAY
)
93 return size_array (e
);
98 return size_integer (e
->ts
.kind
);
100 return size_float (e
->ts
.kind
);
102 return size_complex (e
->ts
.kind
);
104 return size_logical (e
->ts
.kind
);
106 if (e
->expr_type
== EXPR_CONSTANT
)
107 return size_character (e
->value
.character
.length
, e
->ts
.kind
);
108 else if (e
->ts
.u
.cl
!= NULL
&& e
->ts
.u
.cl
->length
!= NULL
109 && e
->ts
.u
.cl
->length
->expr_type
== EXPR_CONSTANT
110 && e
->ts
.u
.cl
->length
->ts
.type
== BT_INTEGER
)
114 gfc_extract_int (e
->ts
.u
.cl
->length
, &length
);
115 return size_character (length
, e
->ts
.kind
);
121 return e
->representation
.length
;
125 /* Determine type size without clobbering the typespec for ISO C
130 type
= gfc_typenode_for_spec (&ts
);
131 size
= int_size_in_bytes (type
);
132 gcc_assert (size
>= 0);
136 gfc_internal_error ("Invalid expression in gfc_target_expr_size.");
142 /* The encode_* functions export a value into a buffer, and
143 return the number of bytes of the buffer that have been
146 static unsigned HOST_WIDE_INT
147 encode_array (gfc_expr
*expr
, unsigned char *buffer
, size_t buffer_size
)
153 gfc_constructor_base ctor
= expr
->value
.constructor
;
155 gfc_array_size (expr
, &array_size
);
156 for (i
= 0; i
< (int)mpz_get_ui (array_size
); i
++)
158 ptr
+= gfc_target_encode_expr (gfc_constructor_lookup_expr (ctor
, i
),
159 &buffer
[ptr
], buffer_size
- ptr
);
162 mpz_clear (array_size
);
168 encode_integer (int kind
, mpz_t integer
, unsigned char *buffer
,
171 return native_encode_expr (gfc_conv_mpz_to_tree (integer
, kind
),
172 buffer
, buffer_size
);
177 encode_float (int kind
, mpfr_t real
, unsigned char *buffer
, size_t buffer_size
)
179 return native_encode_expr (gfc_conv_mpfr_to_tree (real
, kind
, 0), buffer
,
185 encode_complex (int kind
, mpc_t cmplx
,
186 unsigned char *buffer
, size_t buffer_size
)
189 size
= encode_float (kind
, mpc_realref (cmplx
), &buffer
[0], buffer_size
);
190 size
+= encode_float (kind
, mpc_imagref (cmplx
),
191 &buffer
[size
], buffer_size
- size
);
197 encode_logical (int kind
, int logical
, unsigned char *buffer
, size_t buffer_size
)
199 return native_encode_expr (build_int_cst (gfc_get_logical_type (kind
),
201 buffer
, buffer_size
);
206 gfc_encode_character (int kind
, int length
, const gfc_char_t
*string
,
207 unsigned char *buffer
, size_t buffer_size
)
209 size_t elsize
= size_character (1, kind
);
210 tree type
= gfc_get_char_type (kind
);
213 gcc_assert (buffer_size
>= size_character (length
, kind
));
215 for (i
= 0; i
< length
; i
++)
216 native_encode_expr (build_int_cst (type
, string
[i
]), &buffer
[i
*elsize
],
223 static unsigned HOST_WIDE_INT
224 encode_derived (gfc_expr
*source
, unsigned char *buffer
, size_t buffer_size
)
232 type
= gfc_typenode_for_spec (&source
->ts
);
234 for (c
= gfc_constructor_first (source
->value
.constructor
),
235 cmp
= source
->ts
.u
.derived
->components
;
237 c
= gfc_constructor_next (c
), cmp
= cmp
->next
)
242 ptr
= TREE_INT_CST_LOW(DECL_FIELD_OFFSET(cmp
->backend_decl
))
243 + TREE_INT_CST_LOW(DECL_FIELD_BIT_OFFSET(cmp
->backend_decl
))/8;
245 if (c
->expr
->expr_type
== EXPR_NULL
)
247 size
= int_size_in_bytes (TREE_TYPE (cmp
->backend_decl
));
248 gcc_assert (size
>= 0);
249 memset (&buffer
[ptr
], 0, size
);
252 gfc_target_encode_expr (c
->expr
, &buffer
[ptr
],
256 size
= int_size_in_bytes (type
);
257 gcc_assert (size
>= 0);
262 /* Write a constant expression in binary form to a buffer. */
263 unsigned HOST_WIDE_INT
264 gfc_target_encode_expr (gfc_expr
*source
, unsigned char *buffer
,
270 if (source
->expr_type
== EXPR_ARRAY
)
271 return encode_array (source
, buffer
, buffer_size
);
273 gcc_assert (source
->expr_type
== EXPR_CONSTANT
274 || source
->expr_type
== EXPR_STRUCTURE
275 || source
->expr_type
== EXPR_SUBSTRING
);
277 /* If we already have a target-memory representation, we use that rather
278 than recreating one. */
279 if (source
->representation
.string
)
281 memcpy (buffer
, source
->representation
.string
,
282 source
->representation
.length
);
283 return source
->representation
.length
;
286 switch (source
->ts
.type
)
289 return encode_integer (source
->ts
.kind
, source
->value
.integer
, buffer
,
292 return encode_float (source
->ts
.kind
, source
->value
.real
, buffer
,
295 return encode_complex (source
->ts
.kind
, source
->value
.complex,
296 buffer
, buffer_size
);
298 return encode_logical (source
->ts
.kind
, source
->value
.logical
, buffer
,
301 if (source
->expr_type
== EXPR_CONSTANT
|| source
->ref
== NULL
)
302 return gfc_encode_character (source
->ts
.kind
,
303 source
->value
.character
.length
,
304 source
->value
.character
.string
,
305 buffer
, buffer_size
);
310 gcc_assert (source
->expr_type
== EXPR_SUBSTRING
);
311 gfc_extract_int (source
->ref
->u
.ss
.start
, &start
);
312 gfc_extract_int (source
->ref
->u
.ss
.end
, &end
);
313 return gfc_encode_character (source
->ts
.kind
, MAX(end
- start
+ 1, 0),
314 &source
->value
.character
.string
[start
-1],
315 buffer
, buffer_size
);
319 if (source
->ts
.u
.derived
->ts
.f90_type
== BT_VOID
)
322 gcc_assert (source
->expr_type
== EXPR_STRUCTURE
);
323 c
= gfc_constructor_first (source
->value
.constructor
);
324 gcc_assert (c
->expr
->expr_type
== EXPR_CONSTANT
325 && c
->expr
->ts
.type
== BT_INTEGER
);
326 return encode_integer (gfc_index_integer_kind
, c
->expr
->value
.integer
,
327 buffer
, buffer_size
);
330 return encode_derived (source
, buffer
, buffer_size
);
332 gfc_internal_error ("Invalid expression in gfc_target_encode_expr.");
339 interpret_array (unsigned char *buffer
, size_t buffer_size
, gfc_expr
*result
)
341 gfc_constructor_base base
= NULL
;
346 /* Calculate array size from its shape and rank. */
347 gcc_assert (result
->rank
> 0 && result
->shape
);
349 for (i
= 0; i
< result
->rank
; i
++)
350 array_size
*= (int)mpz_get_ui (result
->shape
[i
]);
352 /* Iterate over array elements, producing constructors. */
353 for (i
= 0; i
< array_size
; i
++)
355 gfc_expr
*e
= gfc_get_constant_expr (result
->ts
.type
, result
->ts
.kind
,
359 if (e
->ts
.type
== BT_CHARACTER
)
360 e
->value
.character
.length
= result
->value
.character
.length
;
362 gfc_constructor_append_expr (&base
, e
, &result
->where
);
364 ptr
+= gfc_target_interpret_expr (&buffer
[ptr
], buffer_size
- ptr
, e
,
368 result
->value
.constructor
= base
;
374 gfc_interpret_integer (int kind
, unsigned char *buffer
, size_t buffer_size
,
378 gfc_conv_tree_to_mpz (integer
,
379 native_interpret_expr (gfc_get_int_type (kind
),
380 buffer
, buffer_size
));
381 return size_integer (kind
);
386 gfc_interpret_float (int kind
, unsigned char *buffer
, size_t buffer_size
,
389 gfc_set_model_kind (kind
);
391 gfc_conv_tree_to_mpfr (real
,
392 native_interpret_expr (gfc_get_real_type (kind
),
393 buffer
, buffer_size
));
395 return size_float (kind
);
400 gfc_interpret_complex (int kind
, unsigned char *buffer
, size_t buffer_size
,
404 size
= gfc_interpret_float (kind
, &buffer
[0], buffer_size
,
405 mpc_realref (complex));
406 size
+= gfc_interpret_float (kind
, &buffer
[size
], buffer_size
- size
,
407 mpc_imagref (complex));
413 gfc_interpret_logical (int kind
, unsigned char *buffer
, size_t buffer_size
,
416 tree t
= native_interpret_expr (gfc_get_logical_type (kind
), buffer
,
418 *logical
= tree_to_double_int (t
).is_zero () ? 0 : 1;
419 return size_logical (kind
);
424 gfc_interpret_character (unsigned char *buffer
, size_t buffer_size
,
429 if (result
->ts
.u
.cl
&& result
->ts
.u
.cl
->length
)
430 result
->value
.character
.length
=
431 (int) mpz_get_ui (result
->ts
.u
.cl
->length
->value
.integer
);
433 gcc_assert (buffer_size
>= size_character (result
->value
.character
.length
,
435 result
->value
.character
.string
=
436 gfc_get_wide_string (result
->value
.character
.length
+ 1);
438 if (result
->ts
.kind
== gfc_default_character_kind
)
439 for (i
= 0; i
< result
->value
.character
.length
; i
++)
440 result
->value
.character
.string
[i
] = (gfc_char_t
) buffer
[i
];
444 unsigned bytes
= size_character (1, result
->ts
.kind
);
446 gcc_assert (bytes
<= sizeof (unsigned long));
448 for (i
= 0; i
< result
->value
.character
.length
; i
++)
450 gfc_conv_tree_to_mpz (integer
,
451 native_interpret_expr (gfc_get_char_type (result
->ts
.kind
),
452 &buffer
[bytes
*i
], buffer_size
-bytes
*i
));
453 result
->value
.character
.string
[i
]
454 = (gfc_char_t
) mpz_get_ui (integer
);
460 result
->value
.character
.string
[result
->value
.character
.length
] = '\0';
462 return result
->value
.character
.length
;
467 gfc_interpret_derived (unsigned char *buffer
, size_t buffer_size
, gfc_expr
*result
)
473 /* The attributes of the derived type need to be bolted to the floor. */
474 result
->expr_type
= EXPR_STRUCTURE
;
476 cmp
= result
->ts
.u
.derived
->components
;
478 if (result
->ts
.u
.derived
->from_intmod
== INTMOD_ISO_C_BINDING
479 && (result
->ts
.u
.derived
->intmod_sym_id
== ISOCBINDING_PTR
480 || result
->ts
.u
.derived
->intmod_sym_id
== ISOCBINDING_FUNPTR
))
484 /* Needed as gfc_typenode_for_spec as gfc_typenode_for_spec
485 sets this to BT_INTEGER. */
486 result
->ts
.type
= BT_DERIVED
;
487 e
= gfc_get_constant_expr (cmp
->ts
.type
, cmp
->ts
.kind
, &result
->where
);
488 c
= gfc_constructor_append_expr (&result
->value
.constructor
, e
, NULL
);
489 c
->n
.component
= cmp
;
490 gfc_target_interpret_expr (buffer
, buffer_size
, e
, true);
492 return int_size_in_bytes (ptr_type_node
);
495 type
= gfc_typenode_for_spec (&result
->ts
);
497 /* Run through the derived type components. */
498 for (;cmp
; cmp
= cmp
->next
)
501 gfc_expr
*e
= gfc_get_constant_expr (cmp
->ts
.type
, cmp
->ts
.kind
,
505 /* Copy shape, if needed. */
506 if (cmp
->as
&& cmp
->as
->rank
)
510 e
->expr_type
= EXPR_ARRAY
;
511 e
->rank
= cmp
->as
->rank
;
513 e
->shape
= gfc_get_shape (e
->rank
);
514 for (n
= 0; n
< e
->rank
; n
++)
516 mpz_init_set_ui (e
->shape
[n
], 1);
517 mpz_add (e
->shape
[n
], e
->shape
[n
],
518 cmp
->as
->upper
[n
]->value
.integer
);
519 mpz_sub (e
->shape
[n
], e
->shape
[n
],
520 cmp
->as
->lower
[n
]->value
.integer
);
524 c
= gfc_constructor_append_expr (&result
->value
.constructor
, e
, NULL
);
526 /* The constructor points to the component. */
527 c
->n
.component
= cmp
;
529 /* Calculate the offset, which consists of the FIELD_OFFSET in
530 bytes, which appears in multiples of DECL_OFFSET_ALIGN-bit-sized,
531 and additional bits of FIELD_BIT_OFFSET. The code assumes that all
532 sizes of the components are multiples of BITS_PER_UNIT,
533 i.e. there are, e.g., no bit fields. */
535 gcc_assert (cmp
->backend_decl
);
536 ptr
= TREE_INT_CST_LOW (DECL_FIELD_BIT_OFFSET (cmp
->backend_decl
));
537 gcc_assert (ptr
% 8 == 0);
538 ptr
= ptr
/8 + TREE_INT_CST_LOW (DECL_FIELD_OFFSET (cmp
->backend_decl
));
540 gfc_target_interpret_expr (&buffer
[ptr
], buffer_size
- ptr
, e
, true);
543 return int_size_in_bytes (type
);
547 /* Read a binary buffer to a constant expression. */
549 gfc_target_interpret_expr (unsigned char *buffer
, size_t buffer_size
,
550 gfc_expr
*result
, bool convert_widechar
)
552 if (result
->expr_type
== EXPR_ARRAY
)
553 return interpret_array (buffer
, buffer_size
, result
);
555 switch (result
->ts
.type
)
558 result
->representation
.length
=
559 gfc_interpret_integer (result
->ts
.kind
, buffer
, buffer_size
,
560 result
->value
.integer
);
564 result
->representation
.length
=
565 gfc_interpret_float (result
->ts
.kind
, buffer
, buffer_size
,
570 result
->representation
.length
=
571 gfc_interpret_complex (result
->ts
.kind
, buffer
, buffer_size
,
572 result
->value
.complex);
576 result
->representation
.length
=
577 gfc_interpret_logical (result
->ts
.kind
, buffer
, buffer_size
,
578 &result
->value
.logical
);
582 result
->representation
.length
=
583 gfc_interpret_character (buffer
, buffer_size
, result
);
587 result
->ts
= CLASS_DATA (result
)->ts
;
590 result
->representation
.length
=
591 gfc_interpret_derived (buffer
, buffer_size
, result
);
592 gcc_assert (result
->representation
.length
>= 0);
596 gfc_internal_error ("Invalid expression in gfc_target_interpret_expr.");
600 if (result
->ts
.type
== BT_CHARACTER
&& convert_widechar
)
601 result
->representation
.string
602 = gfc_widechar_to_char (result
->value
.character
.string
,
603 result
->value
.character
.length
);
606 result
->representation
.string
=
607 XCNEWVEC (char, result
->representation
.length
+ 1);
608 memcpy (result
->representation
.string
, buffer
,
609 result
->representation
.length
);
610 result
->representation
.string
[result
->representation
.length
] = '\0';
613 return result
->representation
.length
;
617 /* --------------------------------------------------------------- */
618 /* Two functions used by trans-common.c to write overlapping
619 equivalence initializers to a buffer. This is added to the union
620 and the original initializers freed. */
623 /* Writes the values of a constant expression to a char buffer. If another
624 unequal initializer has already been written to the buffer, this is an
628 expr_to_char (gfc_expr
*e
, unsigned char *data
, unsigned char *chk
, size_t len
)
634 unsigned char *buffer
;
639 /* Take a derived type, one component at a time, using the offsets from the backend
641 if (e
->ts
.type
== BT_DERIVED
)
643 for (c
= gfc_constructor_first (e
->value
.constructor
),
644 cmp
= e
->ts
.u
.derived
->components
;
645 c
; c
= gfc_constructor_next (c
), cmp
= cmp
->next
)
647 gcc_assert (cmp
&& cmp
->backend_decl
);
650 ptr
= TREE_INT_CST_LOW(DECL_FIELD_OFFSET(cmp
->backend_decl
))
651 + TREE_INT_CST_LOW(DECL_FIELD_BIT_OFFSET(cmp
->backend_decl
))/8;
652 expr_to_char (c
->expr
, &data
[ptr
], &chk
[ptr
], len
);
657 /* Otherwise, use the target-memory machinery to write a bitwise image, appropriate
658 to the target, in a buffer and check off the initialized part of the buffer. */
659 len
= gfc_target_expr_size (e
);
660 buffer
= (unsigned char*)alloca (len
);
661 len
= gfc_target_encode_expr (e
, buffer
, len
);
663 for (i
= 0; i
< (int)len
; i
++)
665 if (chk
[i
] && (buffer
[i
] != data
[i
]))
667 gfc_error ("Overlapping unequal initializers in EQUIVALENCE "
674 memcpy (data
, buffer
, len
);
679 /* Writes the values from the equivalence initializers to a char* array
680 that will be written to the constructor to make the initializer for
681 the union declaration. */
684 gfc_merge_initializers (gfc_typespec ts
, gfc_expr
*e
, unsigned char *data
,
685 unsigned char *chk
, size_t length
)
690 switch (e
->expr_type
)
694 len
= expr_to_char (e
, &data
[0], &chk
[0], length
);
699 for (c
= gfc_constructor_first (e
->value
.constructor
);
700 c
; c
= gfc_constructor_next (c
))
702 size_t elt_size
= gfc_target_expr_size (c
->expr
);
704 if (mpz_cmp_si (c
->offset
, 0) != 0)
705 len
= elt_size
* (size_t)mpz_get_si (c
->offset
);
707 len
= len
+ gfc_merge_initializers (ts
, c
->expr
, &data
[len
],
708 &chk
[len
], length
- len
);
720 /* Transfer the bitpattern of a (integer) BOZ to real or complex variables.
721 When successful, no BOZ or nothing to do, true is returned. */
724 gfc_convert_boz (gfc_expr
*expr
, gfc_typespec
*ts
)
726 size_t buffer_size
, boz_bit_size
, ts_bit_size
;
728 unsigned char *buffer
;
733 gcc_assert (expr
->expr_type
== EXPR_CONSTANT
734 && expr
->ts
.type
== BT_INTEGER
);
736 /* Don't convert BOZ to logical, character, derived etc. */
737 if (ts
->type
== BT_REAL
)
739 buffer_size
= size_float (ts
->kind
);
740 ts_bit_size
= buffer_size
* 8;
742 else if (ts
->type
== BT_COMPLEX
)
744 buffer_size
= size_complex (ts
->kind
);
745 ts_bit_size
= buffer_size
* 8 / 2;
750 /* Convert BOZ to the smallest possible integer kind. */
751 boz_bit_size
= mpz_sizeinbase (expr
->value
.integer
, 2);
753 if (boz_bit_size
> ts_bit_size
)
755 gfc_error_now ("BOZ constant at %L is too large (%ld vs %ld bits)",
756 &expr
->where
, (long) boz_bit_size
, (long) ts_bit_size
);
760 for (index
= 0; gfc_integer_kinds
[index
].kind
!= 0; ++index
)
761 if ((unsigned) gfc_integer_kinds
[index
].bit_size
>= ts_bit_size
)
764 expr
->ts
.kind
= gfc_integer_kinds
[index
].kind
;
765 buffer_size
= MAX (buffer_size
, size_integer (expr
->ts
.kind
));
767 buffer
= (unsigned char*)alloca (buffer_size
);
768 encode_integer (expr
->ts
.kind
, expr
->value
.integer
, buffer
, buffer_size
);
769 mpz_clear (expr
->value
.integer
);
771 if (ts
->type
== BT_REAL
)
773 mpfr_init (expr
->value
.real
);
774 gfc_interpret_float (ts
->kind
, buffer
, buffer_size
, expr
->value
.real
);
778 mpc_init2 (expr
->value
.complex, mpfr_get_default_prec());
779 gfc_interpret_complex (ts
->kind
, buffer
, buffer_size
,
780 expr
->value
.complex);
783 expr
->ts
.type
= ts
->type
;
784 expr
->ts
.kind
= ts
->kind
;