1 /* Simulate storage of variables into target memory.
2 Copyright (C) 2007-2015 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"
26 #include "fold-const.h"
27 #include "stor-layout.h"
30 #include "constructor.h"
32 #include "trans-const.h"
33 #include "trans-types.h"
34 #include "target-memory.h"
36 /* --------------------------------------------------------------- */
37 /* Calculate the size of an expression. */
41 size_integer (int kind
)
43 return GET_MODE_SIZE (TYPE_MODE (gfc_get_int_type (kind
)));;
50 return GET_MODE_SIZE (TYPE_MODE (gfc_get_real_type (kind
)));;
55 size_complex (int kind
)
57 return 2 * size_float (kind
);
62 size_logical (int kind
)
64 return GET_MODE_SIZE (TYPE_MODE (gfc_get_logical_type (kind
)));;
69 size_character (int length
, int kind
)
71 int i
= gfc_validate_kind (BT_CHARACTER
, kind
, false);
72 return length
* gfc_character_kinds
[i
].bit_size
/ 8;
76 /* Return the size of a single element of the given expression.
77 Identical to gfc_target_expr_size for scalars. */
80 gfc_element_size (gfc_expr
*e
)
87 return size_integer (e
->ts
.kind
);
89 return size_float (e
->ts
.kind
);
91 return size_complex (e
->ts
.kind
);
93 return size_logical (e
->ts
.kind
);
95 if (e
->expr_type
== EXPR_CONSTANT
)
96 return size_character (e
->value
.character
.length
, e
->ts
.kind
);
97 else if (e
->ts
.u
.cl
!= NULL
&& e
->ts
.u
.cl
->length
!= NULL
98 && e
->ts
.u
.cl
->length
->expr_type
== EXPR_CONSTANT
99 && e
->ts
.u
.cl
->length
->ts
.type
== BT_INTEGER
)
103 gfc_extract_int (e
->ts
.u
.cl
->length
, &length
);
104 return size_character (length
, e
->ts
.kind
);
110 return e
->representation
.length
;
116 /* Determine type size without clobbering the typespec for ISO C
121 type
= gfc_typenode_for_spec (&ts
);
122 size
= int_size_in_bytes (type
);
123 gcc_assert (size
>= 0);
127 gfc_internal_error ("Invalid expression in gfc_element_size.");
133 /* Return the size of an expression in its target representation. */
136 gfc_target_expr_size (gfc_expr
*e
)
141 gcc_assert (e
!= NULL
);
145 if (gfc_array_size (e
, &tmp
))
146 asz
= mpz_get_ui (tmp
);
153 return asz
* gfc_element_size (e
);
157 /* The encode_* functions export a value into a buffer, and
158 return the number of bytes of the buffer that have been
161 static unsigned HOST_WIDE_INT
162 encode_array (gfc_expr
*expr
, unsigned char *buffer
, size_t buffer_size
)
168 gfc_constructor_base ctor
= expr
->value
.constructor
;
170 gfc_array_size (expr
, &array_size
);
171 for (i
= 0; i
< (int)mpz_get_ui (array_size
); i
++)
173 ptr
+= gfc_target_encode_expr (gfc_constructor_lookup_expr (ctor
, i
),
174 &buffer
[ptr
], buffer_size
- ptr
);
177 mpz_clear (array_size
);
183 encode_integer (int kind
, mpz_t integer
, unsigned char *buffer
,
186 return native_encode_expr (gfc_conv_mpz_to_tree (integer
, kind
),
187 buffer
, buffer_size
);
192 encode_float (int kind
, mpfr_t real
, unsigned char *buffer
, size_t buffer_size
)
194 return native_encode_expr (gfc_conv_mpfr_to_tree (real
, kind
, 0), buffer
,
200 encode_complex (int kind
, mpc_t cmplx
,
201 unsigned char *buffer
, size_t buffer_size
)
204 size
= encode_float (kind
, mpc_realref (cmplx
), &buffer
[0], buffer_size
);
205 size
+= encode_float (kind
, mpc_imagref (cmplx
),
206 &buffer
[size
], buffer_size
- size
);
212 encode_logical (int kind
, int logical
, unsigned char *buffer
, size_t buffer_size
)
214 return native_encode_expr (build_int_cst (gfc_get_logical_type (kind
),
216 buffer
, buffer_size
);
221 gfc_encode_character (int kind
, int length
, const gfc_char_t
*string
,
222 unsigned char *buffer
, size_t buffer_size
)
224 size_t elsize
= size_character (1, kind
);
225 tree type
= gfc_get_char_type (kind
);
228 gcc_assert (buffer_size
>= size_character (length
, kind
));
230 for (i
= 0; i
< length
; i
++)
231 native_encode_expr (build_int_cst (type
, string
[i
]), &buffer
[i
*elsize
],
238 static unsigned HOST_WIDE_INT
239 encode_derived (gfc_expr
*source
, unsigned char *buffer
, size_t buffer_size
)
247 type
= gfc_typenode_for_spec (&source
->ts
);
249 for (c
= gfc_constructor_first (source
->value
.constructor
),
250 cmp
= source
->ts
.u
.derived
->components
;
252 c
= gfc_constructor_next (c
), cmp
= cmp
->next
)
257 ptr
= TREE_INT_CST_LOW(DECL_FIELD_OFFSET(cmp
->backend_decl
))
258 + TREE_INT_CST_LOW(DECL_FIELD_BIT_OFFSET(cmp
->backend_decl
))/8;
260 if (c
->expr
->expr_type
== EXPR_NULL
)
262 size
= int_size_in_bytes (TREE_TYPE (cmp
->backend_decl
));
263 gcc_assert (size
>= 0);
264 memset (&buffer
[ptr
], 0, size
);
267 gfc_target_encode_expr (c
->expr
, &buffer
[ptr
],
271 size
= int_size_in_bytes (type
);
272 gcc_assert (size
>= 0);
277 /* Write a constant expression in binary form to a buffer. */
278 unsigned HOST_WIDE_INT
279 gfc_target_encode_expr (gfc_expr
*source
, unsigned char *buffer
,
285 if (source
->expr_type
== EXPR_ARRAY
)
286 return encode_array (source
, buffer
, buffer_size
);
288 gcc_assert (source
->expr_type
== EXPR_CONSTANT
289 || source
->expr_type
== EXPR_STRUCTURE
290 || source
->expr_type
== EXPR_SUBSTRING
);
292 /* If we already have a target-memory representation, we use that rather
293 than recreating one. */
294 if (source
->representation
.string
)
296 memcpy (buffer
, source
->representation
.string
,
297 source
->representation
.length
);
298 return source
->representation
.length
;
301 switch (source
->ts
.type
)
304 return encode_integer (source
->ts
.kind
, source
->value
.integer
, buffer
,
307 return encode_float (source
->ts
.kind
, source
->value
.real
, buffer
,
310 return encode_complex (source
->ts
.kind
, source
->value
.complex,
311 buffer
, buffer_size
);
313 return encode_logical (source
->ts
.kind
, source
->value
.logical
, buffer
,
316 if (source
->expr_type
== EXPR_CONSTANT
|| source
->ref
== NULL
)
317 return gfc_encode_character (source
->ts
.kind
,
318 source
->value
.character
.length
,
319 source
->value
.character
.string
,
320 buffer
, buffer_size
);
325 gcc_assert (source
->expr_type
== EXPR_SUBSTRING
);
326 gfc_extract_int (source
->ref
->u
.ss
.start
, &start
);
327 gfc_extract_int (source
->ref
->u
.ss
.end
, &end
);
328 return gfc_encode_character (source
->ts
.kind
, MAX(end
- start
+ 1, 0),
329 &source
->value
.character
.string
[start
-1],
330 buffer
, buffer_size
);
334 if (source
->ts
.u
.derived
->ts
.f90_type
== BT_VOID
)
337 gcc_assert (source
->expr_type
== EXPR_STRUCTURE
);
338 c
= gfc_constructor_first (source
->value
.constructor
);
339 gcc_assert (c
->expr
->expr_type
== EXPR_CONSTANT
340 && c
->expr
->ts
.type
== BT_INTEGER
);
341 return encode_integer (gfc_index_integer_kind
, c
->expr
->value
.integer
,
342 buffer
, buffer_size
);
345 return encode_derived (source
, buffer
, buffer_size
);
347 gfc_internal_error ("Invalid expression in gfc_target_encode_expr.");
354 interpret_array (unsigned char *buffer
, size_t buffer_size
, gfc_expr
*result
)
356 gfc_constructor_base base
= NULL
;
361 /* Calculate array size from its shape and rank. */
362 gcc_assert (result
->rank
> 0 && result
->shape
);
364 for (i
= 0; i
< result
->rank
; i
++)
365 array_size
*= (int)mpz_get_ui (result
->shape
[i
]);
367 /* Iterate over array elements, producing constructors. */
368 for (i
= 0; i
< array_size
; i
++)
370 gfc_expr
*e
= gfc_get_constant_expr (result
->ts
.type
, result
->ts
.kind
,
374 if (e
->ts
.type
== BT_CHARACTER
)
375 e
->value
.character
.length
= result
->value
.character
.length
;
377 gfc_constructor_append_expr (&base
, e
, &result
->where
);
379 ptr
+= gfc_target_interpret_expr (&buffer
[ptr
], buffer_size
- ptr
, e
,
383 result
->value
.constructor
= base
;
389 gfc_interpret_integer (int kind
, unsigned char *buffer
, size_t buffer_size
,
393 gfc_conv_tree_to_mpz (integer
,
394 native_interpret_expr (gfc_get_int_type (kind
),
395 buffer
, buffer_size
));
396 return size_integer (kind
);
401 gfc_interpret_float (int kind
, unsigned char *buffer
, size_t buffer_size
,
404 gfc_set_model_kind (kind
);
406 gfc_conv_tree_to_mpfr (real
,
407 native_interpret_expr (gfc_get_real_type (kind
),
408 buffer
, buffer_size
));
410 return size_float (kind
);
415 gfc_interpret_complex (int kind
, unsigned char *buffer
, size_t buffer_size
,
419 size
= gfc_interpret_float (kind
, &buffer
[0], buffer_size
,
420 mpc_realref (complex));
421 size
+= gfc_interpret_float (kind
, &buffer
[size
], buffer_size
- size
,
422 mpc_imagref (complex));
428 gfc_interpret_logical (int kind
, unsigned char *buffer
, size_t buffer_size
,
431 tree t
= native_interpret_expr (gfc_get_logical_type (kind
), buffer
,
433 *logical
= wi::eq_p (t
, 0) ? 0 : 1;
434 return size_logical (kind
);
439 gfc_interpret_character (unsigned char *buffer
, size_t buffer_size
,
444 if (result
->ts
.u
.cl
&& result
->ts
.u
.cl
->length
)
445 result
->value
.character
.length
=
446 (int) mpz_get_ui (result
->ts
.u
.cl
->length
->value
.integer
);
448 gcc_assert (buffer_size
>= size_character (result
->value
.character
.length
,
450 result
->value
.character
.string
=
451 gfc_get_wide_string (result
->value
.character
.length
+ 1);
453 if (result
->ts
.kind
== gfc_default_character_kind
)
454 for (i
= 0; i
< result
->value
.character
.length
; i
++)
455 result
->value
.character
.string
[i
] = (gfc_char_t
) buffer
[i
];
459 unsigned bytes
= size_character (1, result
->ts
.kind
);
461 gcc_assert (bytes
<= sizeof (unsigned long));
463 for (i
= 0; i
< result
->value
.character
.length
; i
++)
465 gfc_conv_tree_to_mpz (integer
,
466 native_interpret_expr (gfc_get_char_type (result
->ts
.kind
),
467 &buffer
[bytes
*i
], buffer_size
-bytes
*i
));
468 result
->value
.character
.string
[i
]
469 = (gfc_char_t
) mpz_get_ui (integer
);
475 result
->value
.character
.string
[result
->value
.character
.length
] = '\0';
477 return result
->value
.character
.length
;
482 gfc_interpret_derived (unsigned char *buffer
, size_t buffer_size
, gfc_expr
*result
)
488 /* The attributes of the derived type need to be bolted to the floor. */
489 result
->expr_type
= EXPR_STRUCTURE
;
491 cmp
= result
->ts
.u
.derived
->components
;
493 if (result
->ts
.u
.derived
->from_intmod
== INTMOD_ISO_C_BINDING
494 && (result
->ts
.u
.derived
->intmod_sym_id
== ISOCBINDING_PTR
495 || result
->ts
.u
.derived
->intmod_sym_id
== ISOCBINDING_FUNPTR
))
499 /* Needed as gfc_typenode_for_spec as gfc_typenode_for_spec
500 sets this to BT_INTEGER. */
501 result
->ts
.type
= BT_DERIVED
;
502 e
= gfc_get_constant_expr (cmp
->ts
.type
, cmp
->ts
.kind
, &result
->where
);
503 c
= gfc_constructor_append_expr (&result
->value
.constructor
, e
, NULL
);
504 c
->n
.component
= cmp
;
505 gfc_target_interpret_expr (buffer
, buffer_size
, e
, true);
507 return int_size_in_bytes (ptr_type_node
);
510 type
= gfc_typenode_for_spec (&result
->ts
);
512 /* Run through the derived type components. */
513 for (;cmp
; cmp
= cmp
->next
)
516 gfc_expr
*e
= gfc_get_constant_expr (cmp
->ts
.type
, cmp
->ts
.kind
,
520 /* Copy shape, if needed. */
521 if (cmp
->as
&& cmp
->as
->rank
)
525 e
->expr_type
= EXPR_ARRAY
;
526 e
->rank
= cmp
->as
->rank
;
528 e
->shape
= gfc_get_shape (e
->rank
);
529 for (n
= 0; n
< e
->rank
; n
++)
531 mpz_init_set_ui (e
->shape
[n
], 1);
532 mpz_add (e
->shape
[n
], e
->shape
[n
],
533 cmp
->as
->upper
[n
]->value
.integer
);
534 mpz_sub (e
->shape
[n
], e
->shape
[n
],
535 cmp
->as
->lower
[n
]->value
.integer
);
539 c
= gfc_constructor_append_expr (&result
->value
.constructor
, e
, NULL
);
541 /* The constructor points to the component. */
542 c
->n
.component
= cmp
;
544 /* Calculate the offset, which consists of the FIELD_OFFSET in
545 bytes, which appears in multiples of DECL_OFFSET_ALIGN-bit-sized,
546 and additional bits of FIELD_BIT_OFFSET. The code assumes that all
547 sizes of the components are multiples of BITS_PER_UNIT,
548 i.e. there are, e.g., no bit fields. */
550 gcc_assert (cmp
->backend_decl
);
551 ptr
= TREE_INT_CST_LOW (DECL_FIELD_BIT_OFFSET (cmp
->backend_decl
));
552 gcc_assert (ptr
% 8 == 0);
553 ptr
= ptr
/8 + TREE_INT_CST_LOW (DECL_FIELD_OFFSET (cmp
->backend_decl
));
555 gfc_target_interpret_expr (&buffer
[ptr
], buffer_size
- ptr
, e
, true);
558 return int_size_in_bytes (type
);
562 /* Read a binary buffer to a constant expression. */
564 gfc_target_interpret_expr (unsigned char *buffer
, size_t buffer_size
,
565 gfc_expr
*result
, bool convert_widechar
)
567 if (result
->expr_type
== EXPR_ARRAY
)
568 return interpret_array (buffer
, buffer_size
, result
);
570 switch (result
->ts
.type
)
573 result
->representation
.length
=
574 gfc_interpret_integer (result
->ts
.kind
, buffer
, buffer_size
,
575 result
->value
.integer
);
579 result
->representation
.length
=
580 gfc_interpret_float (result
->ts
.kind
, buffer
, buffer_size
,
585 result
->representation
.length
=
586 gfc_interpret_complex (result
->ts
.kind
, buffer
, buffer_size
,
587 result
->value
.complex);
591 result
->representation
.length
=
592 gfc_interpret_logical (result
->ts
.kind
, buffer
, buffer_size
,
593 &result
->value
.logical
);
597 result
->representation
.length
=
598 gfc_interpret_character (buffer
, buffer_size
, result
);
602 result
->ts
= CLASS_DATA (result
)->ts
;
605 result
->representation
.length
=
606 gfc_interpret_derived (buffer
, buffer_size
, result
);
607 gcc_assert (result
->representation
.length
>= 0);
611 gfc_internal_error ("Invalid expression in gfc_target_interpret_expr.");
615 if (result
->ts
.type
== BT_CHARACTER
&& convert_widechar
)
616 result
->representation
.string
617 = gfc_widechar_to_char (result
->value
.character
.string
,
618 result
->value
.character
.length
);
621 result
->representation
.string
=
622 XCNEWVEC (char, result
->representation
.length
+ 1);
623 memcpy (result
->representation
.string
, buffer
,
624 result
->representation
.length
);
625 result
->representation
.string
[result
->representation
.length
] = '\0';
628 return result
->representation
.length
;
632 /* --------------------------------------------------------------- */
633 /* Two functions used by trans-common.c to write overlapping
634 equivalence initializers to a buffer. This is added to the union
635 and the original initializers freed. */
638 /* Writes the values of a constant expression to a char buffer. If another
639 unequal initializer has already been written to the buffer, this is an
643 expr_to_char (gfc_expr
*e
, unsigned char *data
, unsigned char *chk
, size_t len
)
649 unsigned char *buffer
;
654 /* Take a derived type, one component at a time, using the offsets from the backend
656 if (e
->ts
.type
== BT_DERIVED
)
658 for (c
= gfc_constructor_first (e
->value
.constructor
),
659 cmp
= e
->ts
.u
.derived
->components
;
660 c
; c
= gfc_constructor_next (c
), cmp
= cmp
->next
)
662 gcc_assert (cmp
&& cmp
->backend_decl
);
665 ptr
= TREE_INT_CST_LOW(DECL_FIELD_OFFSET(cmp
->backend_decl
))
666 + TREE_INT_CST_LOW(DECL_FIELD_BIT_OFFSET(cmp
->backend_decl
))/8;
667 expr_to_char (c
->expr
, &data
[ptr
], &chk
[ptr
], len
);
672 /* Otherwise, use the target-memory machinery to write a bitwise image, appropriate
673 to the target, in a buffer and check off the initialized part of the buffer. */
674 len
= gfc_target_expr_size (e
);
675 buffer
= (unsigned char*)alloca (len
);
676 len
= gfc_target_encode_expr (e
, buffer
, len
);
678 for (i
= 0; i
< (int)len
; i
++)
680 if (chk
[i
] && (buffer
[i
] != data
[i
]))
682 gfc_error ("Overlapping unequal initializers in EQUIVALENCE "
689 memcpy (data
, buffer
, len
);
694 /* Writes the values from the equivalence initializers to a char* array
695 that will be written to the constructor to make the initializer for
696 the union declaration. */
699 gfc_merge_initializers (gfc_typespec ts
, gfc_expr
*e
, unsigned char *data
,
700 unsigned char *chk
, size_t length
)
705 switch (e
->expr_type
)
709 len
= expr_to_char (e
, &data
[0], &chk
[0], length
);
714 for (c
= gfc_constructor_first (e
->value
.constructor
);
715 c
; c
= gfc_constructor_next (c
))
717 size_t elt_size
= gfc_target_expr_size (c
->expr
);
719 if (mpz_cmp_si (c
->offset
, 0) != 0)
720 len
= elt_size
* (size_t)mpz_get_si (c
->offset
);
722 len
= len
+ gfc_merge_initializers (ts
, c
->expr
, &data
[len
],
723 &chk
[len
], length
- len
);
735 /* Transfer the bitpattern of a (integer) BOZ to real or complex variables.
736 When successful, no BOZ or nothing to do, true is returned. */
739 gfc_convert_boz (gfc_expr
*expr
, gfc_typespec
*ts
)
741 size_t buffer_size
, boz_bit_size
, ts_bit_size
;
743 unsigned char *buffer
;
748 gcc_assert (expr
->expr_type
== EXPR_CONSTANT
749 && expr
->ts
.type
== BT_INTEGER
);
751 /* Don't convert BOZ to logical, character, derived etc. */
752 if (ts
->type
== BT_REAL
)
754 buffer_size
= size_float (ts
->kind
);
755 ts_bit_size
= buffer_size
* 8;
757 else if (ts
->type
== BT_COMPLEX
)
759 buffer_size
= size_complex (ts
->kind
);
760 ts_bit_size
= buffer_size
* 8 / 2;
765 /* Convert BOZ to the smallest possible integer kind. */
766 boz_bit_size
= mpz_sizeinbase (expr
->value
.integer
, 2);
768 if (boz_bit_size
> ts_bit_size
)
770 gfc_error_now ("BOZ constant at %L is too large (%ld vs %ld bits)",
771 &expr
->where
, (long) boz_bit_size
, (long) ts_bit_size
);
775 for (index
= 0; gfc_integer_kinds
[index
].kind
!= 0; ++index
)
776 if ((unsigned) gfc_integer_kinds
[index
].bit_size
>= ts_bit_size
)
779 expr
->ts
.kind
= gfc_integer_kinds
[index
].kind
;
780 buffer_size
= MAX (buffer_size
, size_integer (expr
->ts
.kind
));
782 buffer
= (unsigned char*)alloca (buffer_size
);
783 encode_integer (expr
->ts
.kind
, expr
->value
.integer
, buffer
, buffer_size
);
784 mpz_clear (expr
->value
.integer
);
786 if (ts
->type
== BT_REAL
)
788 mpfr_init (expr
->value
.real
);
789 gfc_interpret_float (ts
->kind
, buffer
, buffer_size
, expr
->value
.real
);
793 mpc_init2 (expr
->value
.complex, mpfr_get_default_prec());
794 gfc_interpret_complex (ts
->kind
, buffer
, buffer_size
,
795 expr
->value
.complex);
798 expr
->ts
.type
= ts
->type
;
799 expr
->ts
.kind
= ts
->kind
;