1 /* Simulate storage of variables into target memory.
2 Copyright (C) 2007-2018 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"
27 #include "fold-const.h"
28 #include "stor-layout.h"
30 #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 (SCALAR_INT_TYPE_MODE (gfc_get_int_type (kind
)));
49 return GET_MODE_SIZE (SCALAR_FLOAT_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 (SCALAR_INT_TYPE_MODE (gfc_get_logical_type (kind
)));
68 size_character (gfc_charlen_t 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
)
100 HOST_WIDE_INT length
;
102 gfc_extract_hwi (e
->ts
.u
.cl
->length
, &length
);
103 return size_character (length
, e
->ts
.kind
);
109 return e
->representation
.length
;
115 /* Determine type size without clobbering the typespec for ISO C
120 type
= gfc_typenode_for_spec (&ts
);
121 size
= int_size_in_bytes (type
);
122 gcc_assert (size
>= 0);
126 gfc_internal_error ("Invalid expression in gfc_element_size.");
132 /* Return the size of an expression in its target representation. */
135 gfc_target_expr_size (gfc_expr
*e
)
140 gcc_assert (e
!= NULL
);
144 if (gfc_array_size (e
, &tmp
))
145 asz
= mpz_get_ui (tmp
);
152 return asz
* gfc_element_size (e
);
156 /* The encode_* functions export a value into a buffer, and
157 return the number of bytes of the buffer that have been
160 static unsigned HOST_WIDE_INT
161 encode_array (gfc_expr
*expr
, unsigned char *buffer
, size_t buffer_size
)
167 gfc_constructor_base ctor
= expr
->value
.constructor
;
169 gfc_array_size (expr
, &array_size
);
170 for (i
= 0; i
< (int)mpz_get_ui (array_size
); i
++)
172 ptr
+= gfc_target_encode_expr (gfc_constructor_lookup_expr (ctor
, i
),
173 &buffer
[ptr
], buffer_size
- ptr
);
176 mpz_clear (array_size
);
182 encode_integer (int kind
, mpz_t integer
, unsigned char *buffer
,
185 return native_encode_expr (gfc_conv_mpz_to_tree (integer
, kind
),
186 buffer
, buffer_size
);
191 encode_float (int kind
, mpfr_t real
, unsigned char *buffer
, size_t buffer_size
)
193 return native_encode_expr (gfc_conv_mpfr_to_tree (real
, kind
, 0), buffer
,
199 encode_complex (int kind
, mpc_t cmplx
,
200 unsigned char *buffer
, size_t buffer_size
)
203 size
= encode_float (kind
, mpc_realref (cmplx
), &buffer
[0], buffer_size
);
204 size
+= encode_float (kind
, mpc_imagref (cmplx
),
205 &buffer
[size
], buffer_size
- size
);
211 encode_logical (int kind
, int logical
, unsigned char *buffer
, size_t buffer_size
)
213 return native_encode_expr (build_int_cst (gfc_get_logical_type (kind
),
215 buffer
, buffer_size
);
220 gfc_encode_character (int kind
, gfc_charlen_t length
, const gfc_char_t
*string
,
221 unsigned char *buffer
, size_t buffer_size
)
223 size_t elsize
= size_character (1, kind
);
224 tree type
= gfc_get_char_type (kind
);
226 gcc_assert (buffer_size
>= size_character (length
, kind
));
228 for (size_t i
= 0; i
< (size_t) length
; i
++)
229 native_encode_expr (build_int_cst (type
, string
[i
]), &buffer
[i
*elsize
],
236 static unsigned HOST_WIDE_INT
237 encode_derived (gfc_expr
*source
, unsigned char *buffer
, size_t buffer_size
)
245 type
= gfc_typenode_for_spec (&source
->ts
);
247 for (c
= gfc_constructor_first (source
->value
.constructor
),
248 cmp
= source
->ts
.u
.derived
->components
;
250 c
= gfc_constructor_next (c
), cmp
= cmp
->next
)
255 ptr
= TREE_INT_CST_LOW(DECL_FIELD_OFFSET(cmp
->backend_decl
))
256 + TREE_INT_CST_LOW(DECL_FIELD_BIT_OFFSET(cmp
->backend_decl
))/8;
258 if (c
->expr
->expr_type
== EXPR_NULL
)
260 size
= int_size_in_bytes (TREE_TYPE (cmp
->backend_decl
));
261 gcc_assert (size
>= 0);
262 memset (&buffer
[ptr
], 0, size
);
265 gfc_target_encode_expr (c
->expr
, &buffer
[ptr
],
269 size
= int_size_in_bytes (type
);
270 gcc_assert (size
>= 0);
275 /* Write a constant expression in binary form to a buffer. */
276 unsigned HOST_WIDE_INT
277 gfc_target_encode_expr (gfc_expr
*source
, unsigned char *buffer
,
283 if (source
->expr_type
== EXPR_ARRAY
)
284 return encode_array (source
, buffer
, buffer_size
);
286 gcc_assert (source
->expr_type
== EXPR_CONSTANT
287 || source
->expr_type
== EXPR_STRUCTURE
288 || source
->expr_type
== EXPR_SUBSTRING
);
290 /* If we already have a target-memory representation, we use that rather
291 than recreating one. */
292 if (source
->representation
.string
)
294 memcpy (buffer
, source
->representation
.string
,
295 source
->representation
.length
);
296 return source
->representation
.length
;
299 switch (source
->ts
.type
)
302 return encode_integer (source
->ts
.kind
, source
->value
.integer
, buffer
,
305 return encode_float (source
->ts
.kind
, source
->value
.real
, buffer
,
308 return encode_complex (source
->ts
.kind
, source
->value
.complex,
309 buffer
, buffer_size
);
311 return encode_logical (source
->ts
.kind
, source
->value
.logical
, buffer
,
314 if (source
->expr_type
== EXPR_CONSTANT
|| source
->ref
== NULL
)
315 return gfc_encode_character (source
->ts
.kind
,
316 source
->value
.character
.length
,
317 source
->value
.character
.string
,
318 buffer
, buffer_size
);
323 gcc_assert (source
->expr_type
== EXPR_SUBSTRING
);
324 gfc_extract_int (source
->ref
->u
.ss
.start
, &start
);
325 gfc_extract_int (source
->ref
->u
.ss
.end
, &end
);
326 return gfc_encode_character (source
->ts
.kind
, MAX(end
- start
+ 1, 0),
327 &source
->value
.character
.string
[start
-1],
328 buffer
, buffer_size
);
332 if (source
->ts
.u
.derived
->ts
.f90_type
== BT_VOID
)
335 gcc_assert (source
->expr_type
== EXPR_STRUCTURE
);
336 c
= gfc_constructor_first (source
->value
.constructor
);
337 gcc_assert (c
->expr
->expr_type
== EXPR_CONSTANT
338 && c
->expr
->ts
.type
== BT_INTEGER
);
339 return encode_integer (gfc_index_integer_kind
, c
->expr
->value
.integer
,
340 buffer
, buffer_size
);
343 return encode_derived (source
, buffer
, buffer_size
);
345 gfc_internal_error ("Invalid expression in gfc_target_encode_expr.");
352 interpret_array (unsigned char *buffer
, size_t buffer_size
, gfc_expr
*result
)
354 gfc_constructor_base base
= NULL
;
359 /* Calculate array size from its shape and rank. */
360 gcc_assert (result
->rank
> 0 && result
->shape
);
362 for (i
= 0; i
< result
->rank
; i
++)
363 array_size
*= (int)mpz_get_ui (result
->shape
[i
]);
365 /* Iterate over array elements, producing constructors. */
366 for (i
= 0; i
< array_size
; i
++)
368 gfc_expr
*e
= gfc_get_constant_expr (result
->ts
.type
, result
->ts
.kind
,
372 if (e
->ts
.type
== BT_CHARACTER
)
373 e
->value
.character
.length
= result
->value
.character
.length
;
375 gfc_constructor_append_expr (&base
, e
, &result
->where
);
377 ptr
+= gfc_target_interpret_expr (&buffer
[ptr
], buffer_size
- ptr
, e
,
381 result
->value
.constructor
= base
;
387 gfc_interpret_integer (int kind
, unsigned char *buffer
, size_t buffer_size
,
391 gfc_conv_tree_to_mpz (integer
,
392 native_interpret_expr (gfc_get_int_type (kind
),
393 buffer
, buffer_size
));
394 return size_integer (kind
);
399 gfc_interpret_float (int kind
, unsigned char *buffer
, size_t buffer_size
,
402 gfc_set_model_kind (kind
);
404 gfc_conv_tree_to_mpfr (real
,
405 native_interpret_expr (gfc_get_real_type (kind
),
406 buffer
, buffer_size
));
408 return size_float (kind
);
413 gfc_interpret_complex (int kind
, unsigned char *buffer
, size_t buffer_size
,
417 size
= gfc_interpret_float (kind
, &buffer
[0], buffer_size
,
418 mpc_realref (complex));
419 size
+= gfc_interpret_float (kind
, &buffer
[size
], buffer_size
- size
,
420 mpc_imagref (complex));
426 gfc_interpret_logical (int kind
, unsigned char *buffer
, size_t buffer_size
,
429 tree t
= native_interpret_expr (gfc_get_logical_type (kind
), buffer
,
431 *logical
= wi::to_wide (t
) == 0 ? 0 : 1;
432 return size_logical (kind
);
437 gfc_interpret_character (unsigned char *buffer
, size_t buffer_size
,
440 if (result
->ts
.u
.cl
&& result
->ts
.u
.cl
->length
)
441 result
->value
.character
.length
=
442 gfc_mpz_get_hwi (result
->ts
.u
.cl
->length
->value
.integer
);
444 gcc_assert (buffer_size
>= size_character (result
->value
.character
.length
,
446 result
->value
.character
.string
=
447 gfc_get_wide_string (result
->value
.character
.length
+ 1);
449 if (result
->ts
.kind
== gfc_default_character_kind
)
450 for (size_t i
= 0; i
< (size_t) result
->value
.character
.length
; i
++)
451 result
->value
.character
.string
[i
] = (gfc_char_t
) buffer
[i
];
455 unsigned bytes
= size_character (1, result
->ts
.kind
);
457 gcc_assert (bytes
<= sizeof (unsigned long));
459 for (size_t i
= 0; i
< (size_t) result
->value
.character
.length
; i
++)
461 gfc_conv_tree_to_mpz (integer
,
462 native_interpret_expr (gfc_get_char_type (result
->ts
.kind
),
463 &buffer
[bytes
*i
], buffer_size
-bytes
*i
));
464 result
->value
.character
.string
[i
]
465 = (gfc_char_t
) mpz_get_ui (integer
);
471 result
->value
.character
.string
[result
->value
.character
.length
] = '\0';
473 return result
->value
.character
.length
;
478 gfc_interpret_derived (unsigned char *buffer
, size_t buffer_size
, gfc_expr
*result
)
484 /* The attributes of the derived type need to be bolted to the floor. */
485 result
->expr_type
= EXPR_STRUCTURE
;
487 cmp
= result
->ts
.u
.derived
->components
;
489 if (result
->ts
.u
.derived
->from_intmod
== INTMOD_ISO_C_BINDING
490 && (result
->ts
.u
.derived
->intmod_sym_id
== ISOCBINDING_PTR
491 || result
->ts
.u
.derived
->intmod_sym_id
== ISOCBINDING_FUNPTR
))
495 /* Needed as gfc_typenode_for_spec as gfc_typenode_for_spec
496 sets this to BT_INTEGER. */
497 result
->ts
.type
= BT_DERIVED
;
498 e
= gfc_get_constant_expr (cmp
->ts
.type
, cmp
->ts
.kind
, &result
->where
);
499 c
= gfc_constructor_append_expr (&result
->value
.constructor
, e
, NULL
);
500 c
->n
.component
= cmp
;
501 gfc_target_interpret_expr (buffer
, buffer_size
, e
, true);
503 return int_size_in_bytes (ptr_type_node
);
506 type
= gfc_typenode_for_spec (&result
->ts
);
508 /* Run through the derived type components. */
509 for (;cmp
; cmp
= cmp
->next
)
512 gfc_expr
*e
= gfc_get_constant_expr (cmp
->ts
.type
, cmp
->ts
.kind
,
516 /* Copy shape, if needed. */
517 if (cmp
->as
&& cmp
->as
->rank
)
521 e
->expr_type
= EXPR_ARRAY
;
522 e
->rank
= cmp
->as
->rank
;
524 e
->shape
= gfc_get_shape (e
->rank
);
525 for (n
= 0; n
< e
->rank
; n
++)
527 mpz_init_set_ui (e
->shape
[n
], 1);
528 mpz_add (e
->shape
[n
], e
->shape
[n
],
529 cmp
->as
->upper
[n
]->value
.integer
);
530 mpz_sub (e
->shape
[n
], e
->shape
[n
],
531 cmp
->as
->lower
[n
]->value
.integer
);
535 c
= gfc_constructor_append_expr (&result
->value
.constructor
, e
, NULL
);
537 /* The constructor points to the component. */
538 c
->n
.component
= cmp
;
540 /* Calculate the offset, which consists of the FIELD_OFFSET in
541 bytes, which appears in multiples of DECL_OFFSET_ALIGN-bit-sized,
542 and additional bits of FIELD_BIT_OFFSET. The code assumes that all
543 sizes of the components are multiples of BITS_PER_UNIT,
544 i.e. there are, e.g., no bit fields. */
546 gcc_assert (cmp
->backend_decl
);
547 ptr
= TREE_INT_CST_LOW (DECL_FIELD_BIT_OFFSET (cmp
->backend_decl
));
548 gcc_assert (ptr
% 8 == 0);
549 ptr
= ptr
/8 + TREE_INT_CST_LOW (DECL_FIELD_OFFSET (cmp
->backend_decl
));
551 gfc_target_interpret_expr (&buffer
[ptr
], buffer_size
- ptr
, e
, true);
554 return int_size_in_bytes (type
);
558 /* Read a binary buffer to a constant expression. */
560 gfc_target_interpret_expr (unsigned char *buffer
, size_t buffer_size
,
561 gfc_expr
*result
, bool convert_widechar
)
563 if (result
->expr_type
== EXPR_ARRAY
)
564 return interpret_array (buffer
, buffer_size
, result
);
566 switch (result
->ts
.type
)
569 result
->representation
.length
=
570 gfc_interpret_integer (result
->ts
.kind
, buffer
, buffer_size
,
571 result
->value
.integer
);
575 result
->representation
.length
=
576 gfc_interpret_float (result
->ts
.kind
, buffer
, buffer_size
,
581 result
->representation
.length
=
582 gfc_interpret_complex (result
->ts
.kind
, buffer
, buffer_size
,
583 result
->value
.complex);
587 result
->representation
.length
=
588 gfc_interpret_logical (result
->ts
.kind
, buffer
, buffer_size
,
589 &result
->value
.logical
);
593 result
->representation
.length
=
594 gfc_interpret_character (buffer
, buffer_size
, result
);
598 result
->ts
= CLASS_DATA (result
)->ts
;
601 result
->representation
.length
=
602 gfc_interpret_derived (buffer
, buffer_size
, result
);
603 gcc_assert (result
->representation
.length
>= 0);
607 gfc_internal_error ("Invalid expression in gfc_target_interpret_expr.");
611 if (result
->ts
.type
== BT_CHARACTER
&& convert_widechar
)
612 result
->representation
.string
613 = gfc_widechar_to_char (result
->value
.character
.string
,
614 result
->value
.character
.length
);
617 result
->representation
.string
=
618 XCNEWVEC (char, result
->representation
.length
+ 1);
619 memcpy (result
->representation
.string
, buffer
,
620 result
->representation
.length
);
621 result
->representation
.string
[result
->representation
.length
] = '\0';
624 return result
->representation
.length
;
628 /* --------------------------------------------------------------- */
629 /* Two functions used by trans-common.c to write overlapping
630 equivalence initializers to a buffer. This is added to the union
631 and the original initializers freed. */
634 /* Writes the values of a constant expression to a char buffer. If another
635 unequal initializer has already been written to the buffer, this is an
639 expr_to_char (gfc_expr
*e
, locus
*loc
,
640 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
, loc
, &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
]))
680 gfc_error ("Overlapping unequal initializers in EQUIVALENCE "
683 gfc_error ("Overlapping unequal initializers in EQUIVALENCE "
690 memcpy (data
, buffer
, len
);
695 /* Writes the values from the equivalence initializers to a char* array
696 that will be written to the constructor to make the initializer for
697 the union declaration. */
700 gfc_merge_initializers (gfc_typespec ts
, gfc_expr
*e
, locus
*loc
,
702 unsigned char *chk
, size_t length
)
707 switch (e
->expr_type
)
711 len
= expr_to_char (e
, loc
, &data
[0], &chk
[0], length
);
715 for (c
= gfc_constructor_first (e
->value
.constructor
);
716 c
; c
= gfc_constructor_next (c
))
718 size_t elt_size
= gfc_target_expr_size (c
->expr
);
720 if (mpz_cmp_si (c
->offset
, 0) != 0)
721 len
= elt_size
* (size_t)mpz_get_si (c
->offset
);
723 len
= len
+ gfc_merge_initializers (ts
, c
->expr
, loc
, &data
[len
],
724 &chk
[len
], length
- len
);
736 /* Transfer the bitpattern of a (integer) BOZ to real or complex variables.
737 When successful, no BOZ or nothing to do, true is returned. */
740 gfc_convert_boz (gfc_expr
*expr
, gfc_typespec
*ts
)
742 size_t buffer_size
, boz_bit_size
, ts_bit_size
;
744 unsigned char *buffer
;
749 gcc_assert (expr
->expr_type
== EXPR_CONSTANT
750 && expr
->ts
.type
== BT_INTEGER
);
752 /* Don't convert BOZ to logical, character, derived etc. */
753 if (ts
->type
== BT_REAL
)
755 buffer_size
= size_float (ts
->kind
);
756 ts_bit_size
= buffer_size
* 8;
758 else if (ts
->type
== BT_COMPLEX
)
760 buffer_size
= size_complex (ts
->kind
);
761 ts_bit_size
= buffer_size
* 8 / 2;
766 /* Convert BOZ to the smallest possible integer kind. */
767 boz_bit_size
= mpz_sizeinbase (expr
->value
.integer
, 2);
769 if (boz_bit_size
> ts_bit_size
)
771 gfc_error_now ("BOZ constant at %L is too large (%ld vs %ld bits)",
772 &expr
->where
, (long) boz_bit_size
, (long) ts_bit_size
);
776 for (index
= 0; gfc_integer_kinds
[index
].kind
!= 0; ++index
)
777 if ((unsigned) gfc_integer_kinds
[index
].bit_size
>= ts_bit_size
)
780 expr
->ts
.kind
= gfc_integer_kinds
[index
].kind
;
781 buffer_size
= MAX (buffer_size
, size_integer (expr
->ts
.kind
));
783 buffer
= (unsigned char*)alloca (buffer_size
);
784 encode_integer (expr
->ts
.kind
, expr
->value
.integer
, buffer
, buffer_size
);
785 mpz_clear (expr
->value
.integer
);
787 if (ts
->type
== BT_REAL
)
789 mpfr_init (expr
->value
.real
);
790 gfc_interpret_float (ts
->kind
, buffer
, buffer_size
, expr
->value
.real
);
794 mpc_init2 (expr
->value
.complex, mpfr_get_default_prec());
795 gfc_interpret_complex (ts
->kind
, buffer
, buffer_size
,
796 expr
->value
.complex);
799 expr
->ts
.type
= ts
->type
;
800 expr
->ts
.kind
= ts
->kind
;