1 /* Simulate storage of variables into target memory.
2 Copyright (C) 2007-2020 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 Equivalent to gfc_target_expr_size for scalars. */
79 gfc_element_size (gfc_expr
*e
, size_t *siz
)
86 *siz
= size_integer (e
->ts
.kind
);
89 *siz
= size_float (e
->ts
.kind
);
92 *siz
= size_complex (e
->ts
.kind
);
95 *siz
= size_logical (e
->ts
.kind
);
98 if (e
->expr_type
== EXPR_CONSTANT
)
99 *siz
= size_character (e
->value
.character
.length
, e
->ts
.kind
);
100 else if (e
->ts
.u
.cl
!= NULL
&& e
->ts
.u
.cl
->length
!= NULL
101 && e
->ts
.u
.cl
->length
->expr_type
== EXPR_CONSTANT
102 && e
->ts
.u
.cl
->length
->ts
.type
== BT_INTEGER
)
104 HOST_WIDE_INT length
;
106 gfc_extract_hwi (e
->ts
.u
.cl
->length
, &length
);
107 *siz
= size_character (length
, e
->ts
.kind
);
117 *siz
= 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);
137 gfc_internal_error ("Invalid expression in gfc_element_size.");
145 /* Return the size of an expression in its target representation. */
148 gfc_target_expr_size (gfc_expr
*e
, size_t *size
)
153 gcc_assert (e
!= NULL
);
158 if (gfc_array_size (e
, &tmp
))
159 asz
= mpz_get_ui (tmp
);
166 if (!gfc_element_size (e
, &el_size
))
168 *size
= asz
* el_size
;
173 /* The encode_* functions export a value into a buffer, and
174 return the number of bytes of the buffer that have been
177 static unsigned HOST_WIDE_INT
178 encode_array (gfc_expr
*expr
, unsigned char *buffer
, size_t buffer_size
)
184 gfc_constructor_base ctor
= expr
->value
.constructor
;
186 gfc_array_size (expr
, &array_size
);
187 for (i
= 0; i
< (int)mpz_get_ui (array_size
); i
++)
189 ptr
+= gfc_target_encode_expr (gfc_constructor_lookup_expr (ctor
, i
),
190 &buffer
[ptr
], buffer_size
- ptr
);
193 mpz_clear (array_size
);
199 encode_integer (int kind
, mpz_t integer
, unsigned char *buffer
,
202 return native_encode_expr (gfc_conv_mpz_to_tree (integer
, kind
),
203 buffer
, buffer_size
);
208 encode_float (int kind
, mpfr_t real
, unsigned char *buffer
, size_t buffer_size
)
210 return native_encode_expr (gfc_conv_mpfr_to_tree (real
, kind
, 0), buffer
,
216 encode_complex (int kind
, mpc_t cmplx
,
217 unsigned char *buffer
, size_t buffer_size
)
220 size
= encode_float (kind
, mpc_realref (cmplx
), &buffer
[0], buffer_size
);
221 size
+= encode_float (kind
, mpc_imagref (cmplx
),
222 &buffer
[size
], buffer_size
- size
);
228 encode_logical (int kind
, int logical
, unsigned char *buffer
, size_t buffer_size
)
230 return native_encode_expr (build_int_cst (gfc_get_logical_type (kind
),
232 buffer
, buffer_size
);
237 gfc_encode_character (int kind
, size_t length
, const gfc_char_t
*string
,
238 unsigned char *buffer
, size_t buffer_size
)
240 size_t elsize
= size_character (1, kind
);
241 tree type
= gfc_get_char_type (kind
);
243 gcc_assert (buffer_size
>= size_character (length
, kind
));
245 for (size_t i
= 0; i
< length
; i
++)
246 native_encode_expr (build_int_cst (type
, string
[i
]), &buffer
[i
*elsize
],
253 static unsigned HOST_WIDE_INT
254 encode_derived (gfc_expr
*source
, unsigned char *buffer
, size_t buffer_size
)
262 type
= gfc_typenode_for_spec (&source
->ts
);
264 for (c
= gfc_constructor_first (source
->value
.constructor
),
265 cmp
= source
->ts
.u
.derived
->components
;
267 c
= gfc_constructor_next (c
), cmp
= cmp
->next
)
272 ptr
= TREE_INT_CST_LOW(DECL_FIELD_OFFSET(cmp
->backend_decl
))
273 + TREE_INT_CST_LOW(DECL_FIELD_BIT_OFFSET(cmp
->backend_decl
))/8;
275 if (c
->expr
->expr_type
== EXPR_NULL
)
277 size
= int_size_in_bytes (TREE_TYPE (cmp
->backend_decl
));
278 gcc_assert (size
>= 0);
279 memset (&buffer
[ptr
], 0, size
);
282 gfc_target_encode_expr (c
->expr
, &buffer
[ptr
],
286 size
= int_size_in_bytes (type
);
287 gcc_assert (size
>= 0);
292 /* Write a constant expression in binary form to a buffer. */
293 unsigned HOST_WIDE_INT
294 gfc_target_encode_expr (gfc_expr
*source
, unsigned char *buffer
,
300 if (source
->expr_type
== EXPR_ARRAY
)
301 return encode_array (source
, buffer
, buffer_size
);
303 gcc_assert (source
->expr_type
== EXPR_CONSTANT
304 || source
->expr_type
== EXPR_STRUCTURE
305 || source
->expr_type
== EXPR_SUBSTRING
);
307 /* If we already have a target-memory representation, we use that rather
308 than recreating one. */
309 if (source
->representation
.string
)
311 memcpy (buffer
, source
->representation
.string
,
312 source
->representation
.length
);
313 return source
->representation
.length
;
316 switch (source
->ts
.type
)
319 return encode_integer (source
->ts
.kind
, source
->value
.integer
, buffer
,
322 return encode_float (source
->ts
.kind
, source
->value
.real
, buffer
,
325 return encode_complex (source
->ts
.kind
, source
->value
.complex,
326 buffer
, buffer_size
);
328 return encode_logical (source
->ts
.kind
, source
->value
.logical
, buffer
,
331 if (source
->expr_type
== EXPR_CONSTANT
|| source
->ref
== NULL
)
332 return gfc_encode_character (source
->ts
.kind
,
333 source
->value
.character
.length
,
334 source
->value
.character
.string
,
335 buffer
, buffer_size
);
338 HOST_WIDE_INT start
, end
;
340 gcc_assert (source
->expr_type
== EXPR_SUBSTRING
);
341 gfc_extract_hwi (source
->ref
->u
.ss
.start
, &start
);
342 gfc_extract_hwi (source
->ref
->u
.ss
.end
, &end
);
343 return gfc_encode_character (source
->ts
.kind
, MAX(end
- start
+ 1, 0),
344 &source
->value
.character
.string
[start
-1],
345 buffer
, buffer_size
);
349 if (source
->ts
.u
.derived
->ts
.f90_type
== BT_VOID
)
352 gcc_assert (source
->expr_type
== EXPR_STRUCTURE
);
353 c
= gfc_constructor_first (source
->value
.constructor
);
354 gcc_assert (c
->expr
->expr_type
== EXPR_CONSTANT
355 && c
->expr
->ts
.type
== BT_INTEGER
);
356 return encode_integer (gfc_index_integer_kind
, c
->expr
->value
.integer
,
357 buffer
, buffer_size
);
360 return encode_derived (source
, buffer
, buffer_size
);
362 gfc_internal_error ("Invalid expression in gfc_target_encode_expr.");
369 interpret_array (unsigned char *buffer
, size_t buffer_size
, gfc_expr
*result
)
371 gfc_constructor_base base
= NULL
;
372 size_t array_size
= 1;
375 /* Calculate array size from its shape and rank. */
376 gcc_assert (result
->rank
> 0 && result
->shape
);
378 for (int i
= 0; i
< result
->rank
; i
++)
379 array_size
*= mpz_get_ui (result
->shape
[i
]);
381 /* Iterate over array elements, producing constructors. */
382 for (size_t i
= 0; i
< array_size
; i
++)
384 gfc_expr
*e
= gfc_get_constant_expr (result
->ts
.type
, result
->ts
.kind
,
388 if (e
->ts
.type
== BT_CHARACTER
)
389 e
->value
.character
.length
= result
->value
.character
.length
;
391 gfc_constructor_append_expr (&base
, e
, &result
->where
);
393 ptr
+= gfc_target_interpret_expr (&buffer
[ptr
], buffer_size
- ptr
, e
,
397 result
->value
.constructor
= base
;
403 gfc_interpret_integer (int kind
, unsigned char *buffer
, size_t buffer_size
,
407 gfc_conv_tree_to_mpz (integer
,
408 native_interpret_expr (gfc_get_int_type (kind
),
409 buffer
, buffer_size
));
410 return size_integer (kind
);
415 gfc_interpret_float (int kind
, unsigned char *buffer
, size_t buffer_size
,
418 gfc_set_model_kind (kind
);
420 gfc_conv_tree_to_mpfr (real
,
421 native_interpret_expr (gfc_get_real_type (kind
),
422 buffer
, buffer_size
));
424 return size_float (kind
);
429 gfc_interpret_complex (int kind
, unsigned char *buffer
, size_t buffer_size
,
433 size
= gfc_interpret_float (kind
, &buffer
[0], buffer_size
,
434 mpc_realref (complex));
435 size
+= gfc_interpret_float (kind
, &buffer
[size
], buffer_size
- size
,
436 mpc_imagref (complex));
442 gfc_interpret_logical (int kind
, unsigned char *buffer
, size_t buffer_size
,
445 tree t
= native_interpret_expr (gfc_get_logical_type (kind
), buffer
,
447 *logical
= wi::to_wide (t
) == 0 ? 0 : 1;
448 return size_logical (kind
);
453 gfc_interpret_character (unsigned char *buffer
, size_t buffer_size
,
456 if (result
->ts
.u
.cl
&& result
->ts
.u
.cl
->length
)
457 result
->value
.character
.length
=
458 gfc_mpz_get_hwi (result
->ts
.u
.cl
->length
->value
.integer
);
460 gcc_assert (buffer_size
>= size_character (result
->value
.character
.length
,
462 result
->value
.character
.string
=
463 gfc_get_wide_string (result
->value
.character
.length
+ 1);
465 if (result
->ts
.kind
== gfc_default_character_kind
)
466 for (size_t i
= 0; i
< (size_t) result
->value
.character
.length
; i
++)
467 result
->value
.character
.string
[i
] = (gfc_char_t
) buffer
[i
];
471 size_t bytes
= size_character (1, result
->ts
.kind
);
473 gcc_assert (bytes
<= sizeof (unsigned long));
475 for (size_t i
= 0; i
< (size_t) result
->value
.character
.length
; i
++)
477 gfc_conv_tree_to_mpz (integer
,
478 native_interpret_expr (gfc_get_char_type (result
->ts
.kind
),
479 &buffer
[bytes
*i
], buffer_size
-bytes
*i
));
480 result
->value
.character
.string
[i
]
481 = (gfc_char_t
) mpz_get_ui (integer
);
487 result
->value
.character
.string
[result
->value
.character
.length
] = '\0';
489 return result
->value
.character
.length
;
494 gfc_interpret_derived (unsigned char *buffer
, size_t buffer_size
, gfc_expr
*result
)
500 /* The attributes of the derived type need to be bolted to the floor. */
501 result
->expr_type
= EXPR_STRUCTURE
;
503 cmp
= result
->ts
.u
.derived
->components
;
505 if (result
->ts
.u
.derived
->from_intmod
== INTMOD_ISO_C_BINDING
506 && (result
->ts
.u
.derived
->intmod_sym_id
== ISOCBINDING_PTR
507 || result
->ts
.u
.derived
->intmod_sym_id
== ISOCBINDING_FUNPTR
))
511 /* Needed as gfc_typenode_for_spec as gfc_typenode_for_spec
512 sets this to BT_INTEGER. */
513 result
->ts
.type
= BT_DERIVED
;
514 e
= gfc_get_constant_expr (cmp
->ts
.type
, cmp
->ts
.kind
, &result
->where
);
515 c
= gfc_constructor_append_expr (&result
->value
.constructor
, e
, NULL
);
516 c
->n
.component
= cmp
;
517 gfc_target_interpret_expr (buffer
, buffer_size
, e
, true);
519 return int_size_in_bytes (ptr_type_node
);
522 type
= gfc_typenode_for_spec (&result
->ts
);
524 /* Run through the derived type components. */
525 for (;cmp
; cmp
= cmp
->next
)
528 gfc_expr
*e
= gfc_get_constant_expr (cmp
->ts
.type
, cmp
->ts
.kind
,
532 /* Copy shape, if needed. */
533 if (cmp
->as
&& cmp
->as
->rank
)
537 e
->expr_type
= EXPR_ARRAY
;
538 e
->rank
= cmp
->as
->rank
;
540 e
->shape
= gfc_get_shape (e
->rank
);
541 for (n
= 0; n
< e
->rank
; n
++)
543 mpz_init_set_ui (e
->shape
[n
], 1);
544 mpz_add (e
->shape
[n
], e
->shape
[n
],
545 cmp
->as
->upper
[n
]->value
.integer
);
546 mpz_sub (e
->shape
[n
], e
->shape
[n
],
547 cmp
->as
->lower
[n
]->value
.integer
);
551 c
= gfc_constructor_append_expr (&result
->value
.constructor
, e
, NULL
);
553 /* The constructor points to the component. */
554 c
->n
.component
= cmp
;
556 /* Calculate the offset, which consists of the FIELD_OFFSET in
557 bytes, which appears in multiples of DECL_OFFSET_ALIGN-bit-sized,
558 and additional bits of FIELD_BIT_OFFSET. The code assumes that all
559 sizes of the components are multiples of BITS_PER_UNIT,
560 i.e. there are, e.g., no bit fields. */
562 gcc_assert (cmp
->backend_decl
);
563 ptr
= TREE_INT_CST_LOW (DECL_FIELD_BIT_OFFSET (cmp
->backend_decl
));
564 gcc_assert (ptr
% 8 == 0);
565 ptr
= ptr
/8 + TREE_INT_CST_LOW (DECL_FIELD_OFFSET (cmp
->backend_decl
));
567 gcc_assert (e
->ts
.type
!= BT_VOID
|| cmp
->attr
.caf_token
);
568 gfc_target_interpret_expr (&buffer
[ptr
], buffer_size
- ptr
, e
, true);
571 return int_size_in_bytes (type
);
575 /* Read a binary buffer to a constant expression. */
577 gfc_target_interpret_expr (unsigned char *buffer
, size_t buffer_size
,
578 gfc_expr
*result
, bool convert_widechar
)
580 if (result
->expr_type
== EXPR_ARRAY
)
581 return interpret_array (buffer
, buffer_size
, result
);
583 switch (result
->ts
.type
)
586 result
->representation
.length
=
587 gfc_interpret_integer (result
->ts
.kind
, buffer
, buffer_size
,
588 result
->value
.integer
);
592 result
->representation
.length
=
593 gfc_interpret_float (result
->ts
.kind
, buffer
, buffer_size
,
598 result
->representation
.length
=
599 gfc_interpret_complex (result
->ts
.kind
, buffer
, buffer_size
,
600 result
->value
.complex);
604 result
->representation
.length
=
605 gfc_interpret_logical (result
->ts
.kind
, buffer
, buffer_size
,
606 &result
->value
.logical
);
610 result
->representation
.length
=
611 gfc_interpret_character (buffer
, buffer_size
, result
);
615 result
->ts
= CLASS_DATA (result
)->ts
;
618 result
->representation
.length
=
619 gfc_interpret_derived (buffer
, buffer_size
, result
);
620 gcc_assert (result
->representation
.length
>= 0);
624 /* This deals with caf_tokens. */
625 result
->representation
.length
=
626 gfc_interpret_integer (result
->ts
.kind
, buffer
, buffer_size
,
627 result
->value
.integer
);
631 gfc_internal_error ("Invalid expression in gfc_target_interpret_expr.");
635 if (result
->ts
.type
== BT_CHARACTER
&& convert_widechar
)
636 result
->representation
.string
637 = gfc_widechar_to_char (result
->value
.character
.string
,
638 result
->value
.character
.length
);
641 result
->representation
.string
=
642 XCNEWVEC (char, result
->representation
.length
+ 1);
643 memcpy (result
->representation
.string
, buffer
,
644 result
->representation
.length
);
645 result
->representation
.string
[result
->representation
.length
] = '\0';
648 return result
->representation
.length
;
652 /* --------------------------------------------------------------- */
653 /* Two functions used by trans-common.c to write overlapping
654 equivalence initializers to a buffer. This is added to the union
655 and the original initializers freed. */
658 /* Writes the values of a constant expression to a char buffer. If another
659 unequal initializer has already been written to the buffer, this is an
663 expr_to_char (gfc_expr
*e
, locus
*loc
,
664 unsigned char *data
, unsigned char *chk
, size_t len
)
670 unsigned char *buffer
;
675 /* Take a derived type, one component at a time, using the offsets from the backend
677 if (e
->ts
.type
== BT_DERIVED
)
679 for (c
= gfc_constructor_first (e
->value
.constructor
),
680 cmp
= e
->ts
.u
.derived
->components
;
681 c
; c
= gfc_constructor_next (c
), cmp
= cmp
->next
)
683 gcc_assert (cmp
&& cmp
->backend_decl
);
686 ptr
= TREE_INT_CST_LOW(DECL_FIELD_OFFSET(cmp
->backend_decl
))
687 + TREE_INT_CST_LOW(DECL_FIELD_BIT_OFFSET(cmp
->backend_decl
))/8;
688 expr_to_char (c
->expr
, loc
, &data
[ptr
], &chk
[ptr
], len
);
693 /* Otherwise, use the target-memory machinery to write a bitwise image, appropriate
694 to the target, in a buffer and check off the initialized part of the buffer. */
695 gfc_target_expr_size (e
, &len
);
696 buffer
= (unsigned char*)alloca (len
);
697 len
= gfc_target_encode_expr (e
, buffer
, len
);
699 for (i
= 0; i
< (int)len
; i
++)
701 if (chk
[i
] && (buffer
[i
] != data
[i
]))
704 gfc_error ("Overlapping unequal initializers in EQUIVALENCE "
707 gfc_error ("Overlapping unequal initializers in EQUIVALENCE "
714 memcpy (data
, buffer
, len
);
719 /* Writes the values from the equivalence initializers to a char* array
720 that will be written to the constructor to make the initializer for
721 the union declaration. */
724 gfc_merge_initializers (gfc_typespec ts
, gfc_expr
*e
, locus
*loc
,
726 unsigned char *chk
, size_t length
)
731 switch (e
->expr_type
)
735 len
= expr_to_char (e
, loc
, &data
[0], &chk
[0], length
);
739 for (c
= gfc_constructor_first (e
->value
.constructor
);
740 c
; c
= gfc_constructor_next (c
))
744 gfc_target_expr_size (c
->expr
, &elt_size
);
746 if (mpz_cmp_si (c
->offset
, 0) != 0)
747 len
= elt_size
* (size_t)mpz_get_si (c
->offset
);
749 len
= len
+ gfc_merge_initializers (ts
, c
->expr
, loc
, &data
[len
],
750 &chk
[len
], length
- len
);
762 /* Transfer the bitpattern of a (integer) BOZ to real or complex variables.
763 When successful, no BOZ or nothing to do, true is returned. */
766 gfc_convert_boz (gfc_expr
*expr
, gfc_typespec
*ts
)
768 size_t buffer_size
, boz_bit_size
, ts_bit_size
;
770 unsigned char *buffer
;
772 if (expr
->ts
.type
!= BT_INTEGER
)
775 /* Don't convert BOZ to logical, character, derived etc. */
776 gcc_assert (ts
->type
== BT_REAL
);
778 buffer_size
= size_float (ts
->kind
);
779 ts_bit_size
= buffer_size
* 8;
781 /* Convert BOZ to the smallest possible integer kind. */
782 boz_bit_size
= mpz_sizeinbase (expr
->value
.integer
, 2);
784 gcc_assert (boz_bit_size
<= ts_bit_size
);
786 for (index
= 0; gfc_integer_kinds
[index
].kind
!= 0; ++index
)
787 if ((unsigned) gfc_integer_kinds
[index
].bit_size
>= ts_bit_size
)
790 expr
->ts
.kind
= gfc_integer_kinds
[index
].kind
;
791 buffer_size
= MAX (buffer_size
, size_integer (expr
->ts
.kind
));
793 buffer
= (unsigned char*)alloca (buffer_size
);
794 encode_integer (expr
->ts
.kind
, expr
->value
.integer
, buffer
, buffer_size
);
795 mpz_clear (expr
->value
.integer
);
797 mpfr_init (expr
->value
.real
);
798 gfc_interpret_float (ts
->kind
, buffer
, buffer_size
, expr
->value
.real
);
800 expr
->ts
.type
= ts
->type
;
801 expr
->ts
.kind
= ts
->kind
;