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. */
40 size_integer (int kind
)
42 return GET_MODE_SIZE (TYPE_MODE (gfc_get_int_type (kind
)));;
49 return GET_MODE_SIZE (TYPE_MODE (gfc_get_real_type (kind
)));;
54 size_complex (int kind
)
56 return 2 * size_float (kind
);
61 size_logical (int kind
)
63 return GET_MODE_SIZE (TYPE_MODE (gfc_get_logical_type (kind
)));;
68 size_character (int length
, int kind
)
70 int i
= gfc_validate_kind (BT_CHARACTER
, kind
, false);
71 return length
* gfc_character_kinds
[i
].bit_size
/ 8;
75 /* Return the size of a single element of the given expression.
76 Identical to gfc_target_expr_size for scalars. */
79 gfc_element_size (gfc_expr
*e
)
86 return size_integer (e
->ts
.kind
);
88 return size_float (e
->ts
.kind
);
90 return size_complex (e
->ts
.kind
);
92 return size_logical (e
->ts
.kind
);
94 if (e
->expr_type
== EXPR_CONSTANT
)
95 return size_character (e
->value
.character
.length
, e
->ts
.kind
);
96 else if (e
->ts
.u
.cl
!= NULL
&& e
->ts
.u
.cl
->length
!= NULL
97 && e
->ts
.u
.cl
->length
->expr_type
== EXPR_CONSTANT
98 && e
->ts
.u
.cl
->length
->ts
.type
== BT_INTEGER
)
102 gfc_extract_int (e
->ts
.u
.cl
->length
, &length
);
103 return size_character (length
, e
->ts
.kind
);
109 return e
->representation
.length
;
113 /* Determine type size without clobbering the typespec for ISO C
118 type
= gfc_typenode_for_spec (&ts
);
119 size
= int_size_in_bytes (type
);
120 gcc_assert (size
>= 0);
124 gfc_internal_error ("Invalid expression in gfc_element_size.");
130 /* Return the size of an expression in its target representation. */
133 gfc_target_expr_size (gfc_expr
*e
)
138 gcc_assert (e
!= NULL
);
142 if (gfc_array_size (e
, &tmp
))
143 asz
= mpz_get_ui (tmp
);
150 return asz
* gfc_element_size (e
);
154 /* The encode_* functions export a value into a buffer, and
155 return the number of bytes of the buffer that have been
158 static unsigned HOST_WIDE_INT
159 encode_array (gfc_expr
*expr
, unsigned char *buffer
, size_t buffer_size
)
165 gfc_constructor_base ctor
= expr
->value
.constructor
;
167 gfc_array_size (expr
, &array_size
);
168 for (i
= 0; i
< (int)mpz_get_ui (array_size
); i
++)
170 ptr
+= gfc_target_encode_expr (gfc_constructor_lookup_expr (ctor
, i
),
171 &buffer
[ptr
], buffer_size
- ptr
);
174 mpz_clear (array_size
);
180 encode_integer (int kind
, mpz_t integer
, unsigned char *buffer
,
183 return native_encode_expr (gfc_conv_mpz_to_tree (integer
, kind
),
184 buffer
, buffer_size
);
189 encode_float (int kind
, mpfr_t real
, unsigned char *buffer
, size_t buffer_size
)
191 return native_encode_expr (gfc_conv_mpfr_to_tree (real
, kind
, 0), buffer
,
197 encode_complex (int kind
, mpc_t cmplx
,
198 unsigned char *buffer
, size_t buffer_size
)
201 size
= encode_float (kind
, mpc_realref (cmplx
), &buffer
[0], buffer_size
);
202 size
+= encode_float (kind
, mpc_imagref (cmplx
),
203 &buffer
[size
], buffer_size
- size
);
209 encode_logical (int kind
, int logical
, unsigned char *buffer
, size_t buffer_size
)
211 return native_encode_expr (build_int_cst (gfc_get_logical_type (kind
),
213 buffer
, buffer_size
);
218 gfc_encode_character (int kind
, int length
, const gfc_char_t
*string
,
219 unsigned char *buffer
, size_t buffer_size
)
221 size_t elsize
= size_character (1, kind
);
222 tree type
= gfc_get_char_type (kind
);
225 gcc_assert (buffer_size
>= size_character (length
, kind
));
227 for (i
= 0; i
< length
; i
++)
228 native_encode_expr (build_int_cst (type
, string
[i
]), &buffer
[i
*elsize
],
235 static unsigned HOST_WIDE_INT
236 encode_derived (gfc_expr
*source
, unsigned char *buffer
, size_t buffer_size
)
244 type
= gfc_typenode_for_spec (&source
->ts
);
246 for (c
= gfc_constructor_first (source
->value
.constructor
),
247 cmp
= source
->ts
.u
.derived
->components
;
249 c
= gfc_constructor_next (c
), cmp
= cmp
->next
)
254 ptr
= TREE_INT_CST_LOW(DECL_FIELD_OFFSET(cmp
->backend_decl
))
255 + TREE_INT_CST_LOW(DECL_FIELD_BIT_OFFSET(cmp
->backend_decl
))/8;
257 if (c
->expr
->expr_type
== EXPR_NULL
)
259 size
= int_size_in_bytes (TREE_TYPE (cmp
->backend_decl
));
260 gcc_assert (size
>= 0);
261 memset (&buffer
[ptr
], 0, size
);
264 gfc_target_encode_expr (c
->expr
, &buffer
[ptr
],
268 size
= int_size_in_bytes (type
);
269 gcc_assert (size
>= 0);
274 /* Write a constant expression in binary form to a buffer. */
275 unsigned HOST_WIDE_INT
276 gfc_target_encode_expr (gfc_expr
*source
, unsigned char *buffer
,
282 if (source
->expr_type
== EXPR_ARRAY
)
283 return encode_array (source
, buffer
, buffer_size
);
285 gcc_assert (source
->expr_type
== EXPR_CONSTANT
286 || source
->expr_type
== EXPR_STRUCTURE
287 || source
->expr_type
== EXPR_SUBSTRING
);
289 /* If we already have a target-memory representation, we use that rather
290 than recreating one. */
291 if (source
->representation
.string
)
293 memcpy (buffer
, source
->representation
.string
,
294 source
->representation
.length
);
295 return source
->representation
.length
;
298 switch (source
->ts
.type
)
301 return encode_integer (source
->ts
.kind
, source
->value
.integer
, buffer
,
304 return encode_float (source
->ts
.kind
, source
->value
.real
, buffer
,
307 return encode_complex (source
->ts
.kind
, source
->value
.complex,
308 buffer
, buffer_size
);
310 return encode_logical (source
->ts
.kind
, source
->value
.logical
, buffer
,
313 if (source
->expr_type
== EXPR_CONSTANT
|| source
->ref
== NULL
)
314 return gfc_encode_character (source
->ts
.kind
,
315 source
->value
.character
.length
,
316 source
->value
.character
.string
,
317 buffer
, buffer_size
);
322 gcc_assert (source
->expr_type
== EXPR_SUBSTRING
);
323 gfc_extract_int (source
->ref
->u
.ss
.start
, &start
);
324 gfc_extract_int (source
->ref
->u
.ss
.end
, &end
);
325 return gfc_encode_character (source
->ts
.kind
, MAX(end
- start
+ 1, 0),
326 &source
->value
.character
.string
[start
-1],
327 buffer
, buffer_size
);
331 if (source
->ts
.u
.derived
->ts
.f90_type
== BT_VOID
)
334 gcc_assert (source
->expr_type
== EXPR_STRUCTURE
);
335 c
= gfc_constructor_first (source
->value
.constructor
);
336 gcc_assert (c
->expr
->expr_type
== EXPR_CONSTANT
337 && c
->expr
->ts
.type
== BT_INTEGER
);
338 return encode_integer (gfc_index_integer_kind
, c
->expr
->value
.integer
,
339 buffer
, buffer_size
);
342 return encode_derived (source
, buffer
, buffer_size
);
344 gfc_internal_error ("Invalid expression in gfc_target_encode_expr.");
351 interpret_array (unsigned char *buffer
, size_t buffer_size
, gfc_expr
*result
)
353 gfc_constructor_base base
= NULL
;
358 /* Calculate array size from its shape and rank. */
359 gcc_assert (result
->rank
> 0 && result
->shape
);
361 for (i
= 0; i
< result
->rank
; i
++)
362 array_size
*= (int)mpz_get_ui (result
->shape
[i
]);
364 /* Iterate over array elements, producing constructors. */
365 for (i
= 0; i
< array_size
; i
++)
367 gfc_expr
*e
= gfc_get_constant_expr (result
->ts
.type
, result
->ts
.kind
,
371 if (e
->ts
.type
== BT_CHARACTER
)
372 e
->value
.character
.length
= result
->value
.character
.length
;
374 gfc_constructor_append_expr (&base
, e
, &result
->where
);
376 ptr
+= gfc_target_interpret_expr (&buffer
[ptr
], buffer_size
- ptr
, e
,
380 result
->value
.constructor
= base
;
386 gfc_interpret_integer (int kind
, unsigned char *buffer
, size_t buffer_size
,
390 gfc_conv_tree_to_mpz (integer
,
391 native_interpret_expr (gfc_get_int_type (kind
),
392 buffer
, buffer_size
));
393 return size_integer (kind
);
398 gfc_interpret_float (int kind
, unsigned char *buffer
, size_t buffer_size
,
401 gfc_set_model_kind (kind
);
403 gfc_conv_tree_to_mpfr (real
,
404 native_interpret_expr (gfc_get_real_type (kind
),
405 buffer
, buffer_size
));
407 return size_float (kind
);
412 gfc_interpret_complex (int kind
, unsigned char *buffer
, size_t buffer_size
,
416 size
= gfc_interpret_float (kind
, &buffer
[0], buffer_size
,
417 mpc_realref (complex));
418 size
+= gfc_interpret_float (kind
, &buffer
[size
], buffer_size
- size
,
419 mpc_imagref (complex));
425 gfc_interpret_logical (int kind
, unsigned char *buffer
, size_t buffer_size
,
428 tree t
= native_interpret_expr (gfc_get_logical_type (kind
), buffer
,
430 *logical
= tree_to_double_int (t
).is_zero () ? 0 : 1;
431 return size_logical (kind
);
436 gfc_interpret_character (unsigned char *buffer
, size_t buffer_size
,
441 if (result
->ts
.u
.cl
&& result
->ts
.u
.cl
->length
)
442 result
->value
.character
.length
=
443 (int) mpz_get_ui (result
->ts
.u
.cl
->length
->value
.integer
);
445 gcc_assert (buffer_size
>= size_character (result
->value
.character
.length
,
447 result
->value
.character
.string
=
448 gfc_get_wide_string (result
->value
.character
.length
+ 1);
450 if (result
->ts
.kind
== gfc_default_character_kind
)
451 for (i
= 0; i
< result
->value
.character
.length
; i
++)
452 result
->value
.character
.string
[i
] = (gfc_char_t
) buffer
[i
];
456 unsigned bytes
= size_character (1, result
->ts
.kind
);
458 gcc_assert (bytes
<= sizeof (unsigned long));
460 for (i
= 0; i
< result
->value
.character
.length
; i
++)
462 gfc_conv_tree_to_mpz (integer
,
463 native_interpret_expr (gfc_get_char_type (result
->ts
.kind
),
464 &buffer
[bytes
*i
], buffer_size
-bytes
*i
));
465 result
->value
.character
.string
[i
]
466 = (gfc_char_t
) mpz_get_ui (integer
);
472 result
->value
.character
.string
[result
->value
.character
.length
] = '\0';
474 return result
->value
.character
.length
;
479 gfc_interpret_derived (unsigned char *buffer
, size_t buffer_size
, gfc_expr
*result
)
485 /* The attributes of the derived type need to be bolted to the floor. */
486 result
->expr_type
= EXPR_STRUCTURE
;
488 cmp
= result
->ts
.u
.derived
->components
;
490 if (result
->ts
.u
.derived
->from_intmod
== INTMOD_ISO_C_BINDING
491 && (result
->ts
.u
.derived
->intmod_sym_id
== ISOCBINDING_PTR
492 || result
->ts
.u
.derived
->intmod_sym_id
== ISOCBINDING_FUNPTR
))
496 /* Needed as gfc_typenode_for_spec as gfc_typenode_for_spec
497 sets this to BT_INTEGER. */
498 result
->ts
.type
= BT_DERIVED
;
499 e
= gfc_get_constant_expr (cmp
->ts
.type
, cmp
->ts
.kind
, &result
->where
);
500 c
= gfc_constructor_append_expr (&result
->value
.constructor
, e
, NULL
);
501 c
->n
.component
= cmp
;
502 gfc_target_interpret_expr (buffer
, buffer_size
, e
, true);
504 return int_size_in_bytes (ptr_type_node
);
507 type
= gfc_typenode_for_spec (&result
->ts
);
509 /* Run through the derived type components. */
510 for (;cmp
; cmp
= cmp
->next
)
513 gfc_expr
*e
= gfc_get_constant_expr (cmp
->ts
.type
, cmp
->ts
.kind
,
517 /* Copy shape, if needed. */
518 if (cmp
->as
&& cmp
->as
->rank
)
522 e
->expr_type
= EXPR_ARRAY
;
523 e
->rank
= cmp
->as
->rank
;
525 e
->shape
= gfc_get_shape (e
->rank
);
526 for (n
= 0; n
< e
->rank
; n
++)
528 mpz_init_set_ui (e
->shape
[n
], 1);
529 mpz_add (e
->shape
[n
], e
->shape
[n
],
530 cmp
->as
->upper
[n
]->value
.integer
);
531 mpz_sub (e
->shape
[n
], e
->shape
[n
],
532 cmp
->as
->lower
[n
]->value
.integer
);
536 c
= gfc_constructor_append_expr (&result
->value
.constructor
, e
, NULL
);
538 /* The constructor points to the component. */
539 c
->n
.component
= cmp
;
541 /* Calculate the offset, which consists of the FIELD_OFFSET in
542 bytes, which appears in multiples of DECL_OFFSET_ALIGN-bit-sized,
543 and additional bits of FIELD_BIT_OFFSET. The code assumes that all
544 sizes of the components are multiples of BITS_PER_UNIT,
545 i.e. there are, e.g., no bit fields. */
547 gcc_assert (cmp
->backend_decl
);
548 ptr
= TREE_INT_CST_LOW (DECL_FIELD_BIT_OFFSET (cmp
->backend_decl
));
549 gcc_assert (ptr
% 8 == 0);
550 ptr
= ptr
/8 + TREE_INT_CST_LOW (DECL_FIELD_OFFSET (cmp
->backend_decl
));
552 gfc_target_interpret_expr (&buffer
[ptr
], buffer_size
- ptr
, e
, true);
555 return int_size_in_bytes (type
);
559 /* Read a binary buffer to a constant expression. */
561 gfc_target_interpret_expr (unsigned char *buffer
, size_t buffer_size
,
562 gfc_expr
*result
, bool convert_widechar
)
564 if (result
->expr_type
== EXPR_ARRAY
)
565 return interpret_array (buffer
, buffer_size
, result
);
567 switch (result
->ts
.type
)
570 result
->representation
.length
=
571 gfc_interpret_integer (result
->ts
.kind
, buffer
, buffer_size
,
572 result
->value
.integer
);
576 result
->representation
.length
=
577 gfc_interpret_float (result
->ts
.kind
, buffer
, buffer_size
,
582 result
->representation
.length
=
583 gfc_interpret_complex (result
->ts
.kind
, buffer
, buffer_size
,
584 result
->value
.complex);
588 result
->representation
.length
=
589 gfc_interpret_logical (result
->ts
.kind
, buffer
, buffer_size
,
590 &result
->value
.logical
);
594 result
->representation
.length
=
595 gfc_interpret_character (buffer
, buffer_size
, result
);
599 result
->ts
= CLASS_DATA (result
)->ts
;
602 result
->representation
.length
=
603 gfc_interpret_derived (buffer
, buffer_size
, result
);
604 gcc_assert (result
->representation
.length
>= 0);
608 gfc_internal_error ("Invalid expression in gfc_target_interpret_expr.");
612 if (result
->ts
.type
== BT_CHARACTER
&& convert_widechar
)
613 result
->representation
.string
614 = gfc_widechar_to_char (result
->value
.character
.string
,
615 result
->value
.character
.length
);
618 result
->representation
.string
=
619 XCNEWVEC (char, result
->representation
.length
+ 1);
620 memcpy (result
->representation
.string
, buffer
,
621 result
->representation
.length
);
622 result
->representation
.string
[result
->representation
.length
] = '\0';
625 return result
->representation
.length
;
629 /* --------------------------------------------------------------- */
630 /* Two functions used by trans-common.c to write overlapping
631 equivalence initializers to a buffer. This is added to the union
632 and the original initializers freed. */
635 /* Writes the values of a constant expression to a char buffer. If another
636 unequal initializer has already been written to the buffer, this is an
640 expr_to_char (gfc_expr
*e
, unsigned char *data
, unsigned char *chk
, size_t len
)
646 unsigned char *buffer
;
651 /* Take a derived type, one component at a time, using the offsets from the backend
653 if (e
->ts
.type
== BT_DERIVED
)
655 for (c
= gfc_constructor_first (e
->value
.constructor
),
656 cmp
= e
->ts
.u
.derived
->components
;
657 c
; c
= gfc_constructor_next (c
), cmp
= cmp
->next
)
659 gcc_assert (cmp
&& cmp
->backend_decl
);
662 ptr
= TREE_INT_CST_LOW(DECL_FIELD_OFFSET(cmp
->backend_decl
))
663 + TREE_INT_CST_LOW(DECL_FIELD_BIT_OFFSET(cmp
->backend_decl
))/8;
664 expr_to_char (c
->expr
, &data
[ptr
], &chk
[ptr
], len
);
669 /* Otherwise, use the target-memory machinery to write a bitwise image, appropriate
670 to the target, in a buffer and check off the initialized part of the buffer. */
671 len
= gfc_target_expr_size (e
);
672 buffer
= (unsigned char*)alloca (len
);
673 len
= gfc_target_encode_expr (e
, buffer
, len
);
675 for (i
= 0; i
< (int)len
; i
++)
677 if (chk
[i
] && (buffer
[i
] != data
[i
]))
679 gfc_error ("Overlapping unequal initializers in EQUIVALENCE "
686 memcpy (data
, buffer
, len
);
691 /* Writes the values from the equivalence initializers to a char* array
692 that will be written to the constructor to make the initializer for
693 the union declaration. */
696 gfc_merge_initializers (gfc_typespec ts
, gfc_expr
*e
, unsigned char *data
,
697 unsigned char *chk
, size_t length
)
702 switch (e
->expr_type
)
706 len
= expr_to_char (e
, &data
[0], &chk
[0], length
);
711 for (c
= gfc_constructor_first (e
->value
.constructor
);
712 c
; c
= gfc_constructor_next (c
))
714 size_t elt_size
= gfc_target_expr_size (c
->expr
);
716 if (mpz_cmp_si (c
->offset
, 0) != 0)
717 len
= elt_size
* (size_t)mpz_get_si (c
->offset
);
719 len
= len
+ gfc_merge_initializers (ts
, c
->expr
, &data
[len
],
720 &chk
[len
], length
- len
);
732 /* Transfer the bitpattern of a (integer) BOZ to real or complex variables.
733 When successful, no BOZ or nothing to do, true is returned. */
736 gfc_convert_boz (gfc_expr
*expr
, gfc_typespec
*ts
)
738 size_t buffer_size
, boz_bit_size
, ts_bit_size
;
740 unsigned char *buffer
;
745 gcc_assert (expr
->expr_type
== EXPR_CONSTANT
746 && expr
->ts
.type
== BT_INTEGER
);
748 /* Don't convert BOZ to logical, character, derived etc. */
749 if (ts
->type
== BT_REAL
)
751 buffer_size
= size_float (ts
->kind
);
752 ts_bit_size
= buffer_size
* 8;
754 else if (ts
->type
== BT_COMPLEX
)
756 buffer_size
= size_complex (ts
->kind
);
757 ts_bit_size
= buffer_size
* 8 / 2;
762 /* Convert BOZ to the smallest possible integer kind. */
763 boz_bit_size
= mpz_sizeinbase (expr
->value
.integer
, 2);
765 if (boz_bit_size
> ts_bit_size
)
767 gfc_error_now ("BOZ constant at %L is too large (%ld vs %ld bits)",
768 &expr
->where
, (long) boz_bit_size
, (long) ts_bit_size
);
772 for (index
= 0; gfc_integer_kinds
[index
].kind
!= 0; ++index
)
773 if ((unsigned) gfc_integer_kinds
[index
].bit_size
>= ts_bit_size
)
776 expr
->ts
.kind
= gfc_integer_kinds
[index
].kind
;
777 buffer_size
= MAX (buffer_size
, size_integer (expr
->ts
.kind
));
779 buffer
= (unsigned char*)alloca (buffer_size
);
780 encode_integer (expr
->ts
.kind
, expr
->value
.integer
, buffer
, buffer_size
);
781 mpz_clear (expr
->value
.integer
);
783 if (ts
->type
== BT_REAL
)
785 mpfr_init (expr
->value
.real
);
786 gfc_interpret_float (ts
->kind
, buffer
, buffer_size
, expr
->value
.real
);
790 mpc_init2 (expr
->value
.complex, mpfr_get_default_prec());
791 gfc_interpret_complex (ts
->kind
, buffer
, buffer_size
,
792 expr
->value
.complex);
795 expr
->ts
.type
= ts
->type
;
796 expr
->ts
.kind
= ts
->kind
;