1 /* Simulate storage of variables into target memory.
2 Copyright (C) 2007, 2008, 2009, 2010
3 Free Software Foundation, Inc.
4 Contributed by Paul Thomas and Brooks Moses
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 3, or (at your option) any later
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
24 #include "coretypes.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. */
40 size_array (gfc_expr
*e
)
43 gfc_constructor
*c
= gfc_constructor_first (e
->value
.constructor
);
44 size_t elt_size
= gfc_target_expr_size (c
->expr
);
46 gfc_array_size (e
, &array_size
);
47 return (size_t)mpz_get_ui (array_size
) * elt_size
;
51 size_integer (int kind
)
53 return GET_MODE_SIZE (TYPE_MODE (gfc_get_int_type (kind
)));;
60 return GET_MODE_SIZE (TYPE_MODE (gfc_get_real_type (kind
)));;
65 size_complex (int kind
)
67 return 2 * size_float (kind
);
72 size_logical (int kind
)
74 return GET_MODE_SIZE (TYPE_MODE (gfc_get_logical_type (kind
)));;
79 size_character (int length
, int kind
)
81 int i
= gfc_validate_kind (BT_CHARACTER
, kind
, false);
82 return length
* gfc_character_kinds
[i
].bit_size
/ 8;
87 gfc_target_expr_size (gfc_expr
*e
)
91 gcc_assert (e
!= NULL
);
93 if (e
->expr_type
== EXPR_ARRAY
)
94 return size_array (e
);
99 return size_integer (e
->ts
.kind
);
101 return size_float (e
->ts
.kind
);
103 return size_complex (e
->ts
.kind
);
105 return size_logical (e
->ts
.kind
);
107 if (e
->expr_type
== EXPR_CONSTANT
)
108 return size_character (e
->value
.character
.length
, e
->ts
.kind
);
109 else if (e
->ts
.u
.cl
!= NULL
&& e
->ts
.u
.cl
->length
!= NULL
110 && e
->ts
.u
.cl
->length
->expr_type
== EXPR_CONSTANT
111 && e
->ts
.u
.cl
->length
->ts
.type
== BT_INTEGER
)
115 gfc_extract_int (e
->ts
.u
.cl
->length
, &length
);
116 return size_character (length
, e
->ts
.kind
);
122 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 return encode_derived (source
, buffer
, buffer_size
);
321 gfc_internal_error ("Invalid expression in gfc_target_encode_expr.");
328 interpret_array (unsigned char *buffer
, size_t buffer_size
, gfc_expr
*result
)
330 gfc_constructor_base base
= NULL
;
335 /* Calculate array size from its shape and rank. */
336 gcc_assert (result
->rank
> 0 && result
->shape
);
338 for (i
= 0; i
< result
->rank
; i
++)
339 array_size
*= (int)mpz_get_ui (result
->shape
[i
]);
341 /* Iterate over array elements, producing constructors. */
342 for (i
= 0; i
< array_size
; i
++)
344 gfc_expr
*e
= gfc_get_constant_expr (result
->ts
.type
, result
->ts
.kind
,
348 if (e
->ts
.type
== BT_CHARACTER
)
349 e
->value
.character
.length
= result
->value
.character
.length
;
351 gfc_constructor_append_expr (&base
, e
, &result
->where
);
353 ptr
+= gfc_target_interpret_expr (&buffer
[ptr
], buffer_size
- ptr
, e
,
357 result
->value
.constructor
= base
;
363 gfc_interpret_integer (int kind
, unsigned char *buffer
, size_t buffer_size
,
367 gfc_conv_tree_to_mpz (integer
,
368 native_interpret_expr (gfc_get_int_type (kind
),
369 buffer
, buffer_size
));
370 return size_integer (kind
);
375 gfc_interpret_float (int kind
, unsigned char *buffer
, size_t buffer_size
,
378 gfc_set_model_kind (kind
);
380 gfc_conv_tree_to_mpfr (real
,
381 native_interpret_expr (gfc_get_real_type (kind
),
382 buffer
, buffer_size
));
384 return size_float (kind
);
389 gfc_interpret_complex (int kind
, unsigned char *buffer
, size_t buffer_size
,
393 size
= gfc_interpret_float (kind
, &buffer
[0], buffer_size
,
394 mpc_realref (complex));
395 size
+= gfc_interpret_float (kind
, &buffer
[size
], buffer_size
- size
,
396 mpc_imagref (complex));
402 gfc_interpret_logical (int kind
, unsigned char *buffer
, size_t buffer_size
,
405 tree t
= native_interpret_expr (gfc_get_logical_type (kind
), buffer
,
407 *logical
= tree_to_double_int (t
).is_zero () ? 0 : 1;
408 return size_logical (kind
);
413 gfc_interpret_character (unsigned char *buffer
, size_t buffer_size
,
418 if (result
->ts
.u
.cl
&& result
->ts
.u
.cl
->length
)
419 result
->value
.character
.length
=
420 (int) mpz_get_ui (result
->ts
.u
.cl
->length
->value
.integer
);
422 gcc_assert (buffer_size
>= size_character (result
->value
.character
.length
,
424 result
->value
.character
.string
=
425 gfc_get_wide_string (result
->value
.character
.length
+ 1);
427 if (result
->ts
.kind
== gfc_default_character_kind
)
428 for (i
= 0; i
< result
->value
.character
.length
; i
++)
429 result
->value
.character
.string
[i
] = (gfc_char_t
) buffer
[i
];
433 unsigned bytes
= size_character (1, result
->ts
.kind
);
435 gcc_assert (bytes
<= sizeof (unsigned long));
437 for (i
= 0; i
< result
->value
.character
.length
; i
++)
439 gfc_conv_tree_to_mpz (integer
,
440 native_interpret_expr (gfc_get_char_type (result
->ts
.kind
),
441 &buffer
[bytes
*i
], buffer_size
-bytes
*i
));
442 result
->value
.character
.string
[i
]
443 = (gfc_char_t
) mpz_get_ui (integer
);
449 result
->value
.character
.string
[result
->value
.character
.length
] = '\0';
451 return result
->value
.character
.length
;
456 gfc_interpret_derived (unsigned char *buffer
, size_t buffer_size
, gfc_expr
*result
)
462 /* The attributes of the derived type need to be bolted to the floor. */
463 result
->expr_type
= EXPR_STRUCTURE
;
465 cmp
= result
->ts
.u
.derived
->components
;
467 if (result
->ts
.u
.derived
->from_intmod
== INTMOD_ISO_C_BINDING
468 && (result
->ts
.u
.derived
->intmod_sym_id
== ISOCBINDING_PTR
469 || result
->ts
.u
.derived
->intmod_sym_id
== ISOCBINDING_FUNPTR
))
473 /* Needed as gfc_typenode_for_spec as gfc_typenode_for_spec
474 sets this to BT_INTEGER. */
475 result
->ts
.type
= BT_DERIVED
;
476 e
= gfc_get_constant_expr (cmp
->ts
.type
, cmp
->ts
.kind
, &result
->where
);
477 c
= gfc_constructor_append_expr (&result
->value
.constructor
, e
, NULL
);
478 c
->n
.component
= cmp
;
479 gfc_target_interpret_expr (buffer
, buffer_size
, e
, true);
481 return int_size_in_bytes (ptr_type_node
);
484 type
= gfc_typenode_for_spec (&result
->ts
);
486 /* Run through the derived type components. */
487 for (;cmp
; cmp
= cmp
->next
)
490 gfc_expr
*e
= gfc_get_constant_expr (cmp
->ts
.type
, cmp
->ts
.kind
,
494 /* Copy shape, if needed. */
495 if (cmp
->as
&& cmp
->as
->rank
)
499 e
->expr_type
= EXPR_ARRAY
;
500 e
->rank
= cmp
->as
->rank
;
502 e
->shape
= gfc_get_shape (e
->rank
);
503 for (n
= 0; n
< e
->rank
; n
++)
505 mpz_init_set_ui (e
->shape
[n
], 1);
506 mpz_add (e
->shape
[n
], e
->shape
[n
],
507 cmp
->as
->upper
[n
]->value
.integer
);
508 mpz_sub (e
->shape
[n
], e
->shape
[n
],
509 cmp
->as
->lower
[n
]->value
.integer
);
513 c
= gfc_constructor_append_expr (&result
->value
.constructor
, e
, NULL
);
515 /* The constructor points to the component. */
516 c
->n
.component
= cmp
;
518 /* Calculate the offset, which consists of the FIELD_OFFSET in
519 bytes, which appears in multiples of DECL_OFFSET_ALIGN-bit-sized,
520 and additional bits of FIELD_BIT_OFFSET. The code assumes that all
521 sizes of the components are multiples of BITS_PER_UNIT,
522 i.e. there are, e.g., no bit fields. */
524 gcc_assert (cmp
->backend_decl
);
525 ptr
= TREE_INT_CST_LOW (DECL_FIELD_BIT_OFFSET (cmp
->backend_decl
));
526 gcc_assert (ptr
% 8 == 0);
527 ptr
= ptr
/8 + TREE_INT_CST_LOW (DECL_FIELD_OFFSET (cmp
->backend_decl
));
529 gfc_target_interpret_expr (&buffer
[ptr
], buffer_size
- ptr
, e
, true);
532 return int_size_in_bytes (type
);
536 /* Read a binary buffer to a constant expression. */
538 gfc_target_interpret_expr (unsigned char *buffer
, size_t buffer_size
,
539 gfc_expr
*result
, bool convert_widechar
)
541 if (result
->expr_type
== EXPR_ARRAY
)
542 return interpret_array (buffer
, buffer_size
, result
);
544 switch (result
->ts
.type
)
547 result
->representation
.length
=
548 gfc_interpret_integer (result
->ts
.kind
, buffer
, buffer_size
,
549 result
->value
.integer
);
553 result
->representation
.length
=
554 gfc_interpret_float (result
->ts
.kind
, buffer
, buffer_size
,
559 result
->representation
.length
=
560 gfc_interpret_complex (result
->ts
.kind
, buffer
, buffer_size
,
561 result
->value
.complex);
565 result
->representation
.length
=
566 gfc_interpret_logical (result
->ts
.kind
, buffer
, buffer_size
,
567 &result
->value
.logical
);
571 result
->representation
.length
=
572 gfc_interpret_character (buffer
, buffer_size
, result
);
576 result
->representation
.length
=
577 gfc_interpret_derived (buffer
, buffer_size
, result
);
578 gcc_assert (result
->representation
.length
>= 0);
582 gfc_internal_error ("Invalid expression in gfc_target_interpret_expr.");
586 if (result
->ts
.type
== BT_CHARACTER
&& convert_widechar
)
587 result
->representation
.string
588 = gfc_widechar_to_char (result
->value
.character
.string
,
589 result
->value
.character
.length
);
592 result
->representation
.string
=
593 XCNEWVEC (char, result
->representation
.length
+ 1);
594 memcpy (result
->representation
.string
, buffer
,
595 result
->representation
.length
);
596 result
->representation
.string
[result
->representation
.length
] = '\0';
599 return result
->representation
.length
;
603 /* --------------------------------------------------------------- */
604 /* Two functions used by trans-common.c to write overlapping
605 equivalence initializers to a buffer. This is added to the union
606 and the original initializers freed. */
609 /* Writes the values of a constant expression to a char buffer. If another
610 unequal initializer has already been written to the buffer, this is an
614 expr_to_char (gfc_expr
*e
, unsigned char *data
, unsigned char *chk
, size_t len
)
620 unsigned char *buffer
;
625 /* Take a derived type, one component at a time, using the offsets from the backend
627 if (e
->ts
.type
== BT_DERIVED
)
629 for (c
= gfc_constructor_first (e
->value
.constructor
),
630 cmp
= e
->ts
.u
.derived
->components
;
631 c
; c
= gfc_constructor_next (c
), cmp
= cmp
->next
)
633 gcc_assert (cmp
&& cmp
->backend_decl
);
636 ptr
= TREE_INT_CST_LOW(DECL_FIELD_OFFSET(cmp
->backend_decl
))
637 + TREE_INT_CST_LOW(DECL_FIELD_BIT_OFFSET(cmp
->backend_decl
))/8;
638 expr_to_char (c
->expr
, &data
[ptr
], &chk
[ptr
], len
);
643 /* Otherwise, use the target-memory machinery to write a bitwise image, appropriate
644 to the target, in a buffer and check off the initialized part of the buffer. */
645 len
= gfc_target_expr_size (e
);
646 buffer
= (unsigned char*)alloca (len
);
647 len
= gfc_target_encode_expr (e
, buffer
, len
);
649 for (i
= 0; i
< (int)len
; i
++)
651 if (chk
[i
] && (buffer
[i
] != data
[i
]))
653 gfc_error ("Overlapping unequal initializers in EQUIVALENCE "
660 memcpy (data
, buffer
, len
);
665 /* Writes the values from the equivalence initializers to a char* array
666 that will be written to the constructor to make the initializer for
667 the union declaration. */
670 gfc_merge_initializers (gfc_typespec ts
, gfc_expr
*e
, unsigned char *data
,
671 unsigned char *chk
, size_t length
)
676 switch (e
->expr_type
)
680 len
= expr_to_char (e
, &data
[0], &chk
[0], length
);
685 for (c
= gfc_constructor_first (e
->value
.constructor
);
686 c
; c
= gfc_constructor_next (c
))
688 size_t elt_size
= gfc_target_expr_size (c
->expr
);
690 if (mpz_cmp_si (c
->offset
, 0) != 0)
691 len
= elt_size
* (size_t)mpz_get_si (c
->offset
);
693 len
= len
+ gfc_merge_initializers (ts
, c
->expr
, &data
[len
],
694 &chk
[len
], length
- len
);
706 /* Transfer the bitpattern of a (integer) BOZ to real or complex variables.
707 When successful, no BOZ or nothing to do, true is returned. */
710 gfc_convert_boz (gfc_expr
*expr
, gfc_typespec
*ts
)
712 size_t buffer_size
, boz_bit_size
, ts_bit_size
;
714 unsigned char *buffer
;
719 gcc_assert (expr
->expr_type
== EXPR_CONSTANT
720 && expr
->ts
.type
== BT_INTEGER
);
722 /* Don't convert BOZ to logical, character, derived etc. */
723 if (ts
->type
== BT_REAL
)
725 buffer_size
= size_float (ts
->kind
);
726 ts_bit_size
= buffer_size
* 8;
728 else if (ts
->type
== BT_COMPLEX
)
730 buffer_size
= size_complex (ts
->kind
);
731 ts_bit_size
= buffer_size
* 8 / 2;
736 /* Convert BOZ to the smallest possible integer kind. */
737 boz_bit_size
= mpz_sizeinbase (expr
->value
.integer
, 2);
739 if (boz_bit_size
> ts_bit_size
)
741 gfc_error_now ("BOZ constant at %L is too large (%ld vs %ld bits)",
742 &expr
->where
, (long) boz_bit_size
, (long) ts_bit_size
);
746 for (index
= 0; gfc_integer_kinds
[index
].kind
!= 0; ++index
)
747 if ((unsigned) gfc_integer_kinds
[index
].bit_size
>= ts_bit_size
)
750 expr
->ts
.kind
= gfc_integer_kinds
[index
].kind
;
751 buffer_size
= MAX (buffer_size
, size_integer (expr
->ts
.kind
));
753 buffer
= (unsigned char*)alloca (buffer_size
);
754 encode_integer (expr
->ts
.kind
, expr
->value
.integer
, buffer
, buffer_size
);
755 mpz_clear (expr
->value
.integer
);
757 if (ts
->type
== BT_REAL
)
759 mpfr_init (expr
->value
.real
);
760 gfc_interpret_float (ts
->kind
, buffer
, buffer_size
, expr
->value
.real
);
764 mpc_init2 (expr
->value
.complex, mpfr_get_default_prec());
765 gfc_interpret_complex (ts
->kind
, buffer
, buffer_size
,
766 expr
->value
.complex);
769 expr
->ts
.type
= ts
->type
;
770 expr
->ts
.kind
= ts
->kind
;