1 /* Simulate storage of variables into target memory.
2 Copyright (C) 2007, 2008, 2009
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/>. */
30 #include "trans-const.h"
31 #include "trans-types.h"
32 #include "target-memory.h"
34 /* --------------------------------------------------------------- */
35 /* Calculate the size of an expression. */
38 size_array (gfc_expr *e)
41 size_t elt_size = gfc_target_expr_size (e->value.constructor->expr);
43 gfc_array_size (e, &array_size);
44 return (size_t)mpz_get_ui (array_size) * elt_size;
48 size_integer (int kind)
50 return GET_MODE_SIZE (TYPE_MODE (gfc_get_int_type (kind)));;
57 return GET_MODE_SIZE (TYPE_MODE (gfc_get_real_type (kind)));;
62 size_complex (int kind)
64 return 2 * size_float (kind);
69 size_logical (int kind)
71 return GET_MODE_SIZE (TYPE_MODE (gfc_get_logical_type (kind)));;
76 size_character (int length, int kind)
78 int i = gfc_validate_kind (BT_CHARACTER, kind, false);
79 return length * gfc_character_kinds[i].bit_size / 8;
84 gfc_target_expr_size (gfc_expr *e)
88 gcc_assert (e != NULL);
90 if (e->expr_type == EXPR_ARRAY)
91 return size_array (e);
96 return size_integer (e->ts.kind);
98 return size_float (e->ts.kind);
100 return size_complex (e->ts.kind);
102 return size_logical (e->ts.kind);
104 if (e->expr_type == EXPR_SUBSTRING && e->ref)
108 gfc_extract_int (e->ref->u.ss.start, &start);
109 gfc_extract_int (e->ref->u.ss.end, &end);
110 return size_character (MAX(end - start + 1, 0), e->ts.kind);
113 return size_character (e->value.character.length, e->ts.kind);
115 return e->representation.length;
117 type = gfc_typenode_for_spec (&e->ts);
118 return int_size_in_bytes (type);
120 gfc_internal_error ("Invalid expression in gfc_target_expr_size.");
126 /* The encode_* functions export a value into a buffer, and
127 return the number of bytes of the buffer that have been
131 encode_array (gfc_expr *expr, unsigned char *buffer, size_t buffer_size)
137 gfc_array_size (expr, &array_size);
138 for (i = 0; i < (int)mpz_get_ui (array_size); i++)
140 ptr += gfc_target_encode_expr (gfc_get_array_element (expr, i),
141 &buffer[ptr], buffer_size - ptr);
144 mpz_clear (array_size);
150 encode_integer (int kind, mpz_t integer, unsigned char *buffer,
153 return native_encode_expr (gfc_conv_mpz_to_tree (integer, kind),
154 buffer, buffer_size);
159 encode_float (int kind, mpfr_t real, unsigned char *buffer, size_t buffer_size)
161 return native_encode_expr (gfc_conv_mpfr_to_tree (real, kind, 0), buffer,
167 encode_complex (int kind, mpc_t cmplx,
168 unsigned char *buffer, size_t buffer_size)
171 size = encode_float (kind, mpc_realref (cmplx), &buffer[0], buffer_size);
172 size += encode_float (kind, mpc_imagref (cmplx),
173 &buffer[size], buffer_size - size);
179 encode_logical (int kind, int logical, unsigned char *buffer, size_t buffer_size)
181 return native_encode_expr (build_int_cst (gfc_get_logical_type (kind),
183 buffer, buffer_size);
188 gfc_encode_character (int kind, int length, const gfc_char_t *string,
189 unsigned char *buffer, size_t buffer_size)
191 size_t elsize = size_character (1, kind);
192 tree type = gfc_get_char_type (kind);
195 gcc_assert (buffer_size >= size_character (length, kind));
197 for (i = 0; i < length; i++)
198 native_encode_expr (build_int_cst (type, string[i]), &buffer[i*elsize],
206 encode_derived (gfc_expr *source, unsigned char *buffer, size_t buffer_size)
208 gfc_constructor *ctr;
213 type = gfc_typenode_for_spec (&source->ts);
215 ctr = source->value.constructor;
216 cmp = source->ts.u.derived->components;
217 for (;ctr; ctr = ctr->next, cmp = cmp->next)
222 ptr = TREE_INT_CST_LOW(DECL_FIELD_OFFSET(cmp->backend_decl))
223 + TREE_INT_CST_LOW(DECL_FIELD_BIT_OFFSET(cmp->backend_decl))/8;
225 if (ctr->expr->expr_type == EXPR_NULL)
226 memset (&buffer[ptr], 0,
227 int_size_in_bytes (TREE_TYPE (cmp->backend_decl)));
229 gfc_target_encode_expr (ctr->expr, &buffer[ptr],
233 return int_size_in_bytes (type);
237 /* Write a constant expression in binary form to a buffer. */
239 gfc_target_encode_expr (gfc_expr *source, unsigned char *buffer,
245 if (source->expr_type == EXPR_ARRAY)
246 return encode_array (source, buffer, buffer_size);
248 gcc_assert (source->expr_type == EXPR_CONSTANT
249 || source->expr_type == EXPR_STRUCTURE
250 || source->expr_type == EXPR_SUBSTRING);
252 /* If we already have a target-memory representation, we use that rather
253 than recreating one. */
254 if (source->representation.string)
256 memcpy (buffer, source->representation.string,
257 source->representation.length);
258 return source->representation.length;
261 switch (source->ts.type)
264 return encode_integer (source->ts.kind, source->value.integer, buffer,
267 return encode_float (source->ts.kind, source->value.real, buffer,
270 return encode_complex (source->ts.kind, source->value.complex,
271 buffer, buffer_size);
273 return encode_logical (source->ts.kind, source->value.logical, buffer,
276 if (source->expr_type == EXPR_CONSTANT || source->ref == NULL)
277 return gfc_encode_character (source->ts.kind,
278 source->value.character.length,
279 source->value.character.string,
280 buffer, buffer_size);
285 gcc_assert (source->expr_type == EXPR_SUBSTRING);
286 gfc_extract_int (source->ref->u.ss.start, &start);
287 gfc_extract_int (source->ref->u.ss.end, &end);
288 return gfc_encode_character (source->ts.kind, MAX(end - start + 1, 0),
289 &source->value.character.string[start-1],
290 buffer, buffer_size);
294 return encode_derived (source, buffer, buffer_size);
296 gfc_internal_error ("Invalid expression in gfc_target_encode_expr.");
303 interpret_array (unsigned char *buffer, size_t buffer_size, gfc_expr *result)
308 gfc_constructor *head = NULL, *tail = NULL;
310 /* Calculate array size from its shape and rank. */
311 gcc_assert (result->rank > 0 && result->shape);
313 for (i = 0; i < result->rank; i++)
314 array_size *= (int)mpz_get_ui (result->shape[i]);
316 /* Iterate over array elements, producing constructors. */
317 for (i = 0; i < array_size; i++)
320 head = tail = gfc_get_constructor ();
323 tail->next = gfc_get_constructor ();
327 tail->where = result->where;
328 tail->expr = gfc_constant_result (result->ts.type,
329 result->ts.kind, &result->where);
330 tail->expr->ts = result->ts;
332 if (tail->expr->ts.type == BT_CHARACTER)
333 tail->expr->value.character.length = result->value.character.length;
335 ptr += gfc_target_interpret_expr (&buffer[ptr], buffer_size - ptr,
338 result->value.constructor = head;
345 gfc_interpret_integer (int kind, unsigned char *buffer, size_t buffer_size,
349 gfc_conv_tree_to_mpz (integer,
350 native_interpret_expr (gfc_get_int_type (kind),
351 buffer, buffer_size));
352 return size_integer (kind);
357 gfc_interpret_float (int kind, unsigned char *buffer, size_t buffer_size,
360 gfc_set_model_kind (kind);
362 gfc_conv_tree_to_mpfr (real,
363 native_interpret_expr (gfc_get_real_type (kind),
364 buffer, buffer_size));
366 return size_float (kind);
371 gfc_interpret_complex (int kind, unsigned char *buffer, size_t buffer_size,
375 size = gfc_interpret_float (kind, &buffer[0], buffer_size,
376 mpc_realref (complex));
377 size += gfc_interpret_float (kind, &buffer[size], buffer_size - size,
378 mpc_imagref (complex));
384 gfc_interpret_logical (int kind, unsigned char *buffer, size_t buffer_size,
387 tree t = native_interpret_expr (gfc_get_logical_type (kind), buffer,
389 *logical = double_int_zero_p (tree_to_double_int (t))
391 return size_logical (kind);
396 gfc_interpret_character (unsigned char *buffer, size_t buffer_size,
401 if (result->ts.u.cl && result->ts.u.cl->length)
402 result->value.character.length =
403 (int) mpz_get_ui (result->ts.u.cl->length->value.integer);
405 gcc_assert (buffer_size >= size_character (result->value.character.length,
407 result->value.character.string =
408 gfc_get_wide_string (result->value.character.length + 1);
410 if (result->ts.kind == gfc_default_character_kind)
411 for (i = 0; i < result->value.character.length; i++)
412 result->value.character.string[i] = (gfc_char_t) buffer[i];
416 unsigned bytes = size_character (1, result->ts.kind);
418 gcc_assert (bytes <= sizeof (unsigned long));
420 for (i = 0; i < result->value.character.length; i++)
422 gfc_conv_tree_to_mpz (integer,
423 native_interpret_expr (gfc_get_char_type (result->ts.kind),
424 &buffer[bytes*i], buffer_size-bytes*i));
425 result->value.character.string[i]
426 = (gfc_char_t) mpz_get_ui (integer);
432 result->value.character.string[result->value.character.length] = '\0';
434 return result->value.character.length;
439 gfc_interpret_derived (unsigned char *buffer, size_t buffer_size, gfc_expr *result)
442 gfc_constructor *head = NULL, *tail = NULL;
446 /* The attributes of the derived type need to be bolted to the floor. */
447 result->expr_type = EXPR_STRUCTURE;
449 type = gfc_typenode_for_spec (&result->ts);
450 cmp = result->ts.u.derived->components;
452 /* Run through the derived type components. */
453 for (;cmp; cmp = cmp->next)
456 head = tail = gfc_get_constructor ();
459 tail->next = gfc_get_constructor ();
463 /* The constructor points to the component. */
464 tail->n.component = cmp;
466 tail->expr = gfc_constant_result (cmp->ts.type, cmp->ts.kind,
468 tail->expr->ts = cmp->ts;
470 /* Copy shape, if needed. */
471 if (cmp->as && cmp->as->rank)
475 tail->expr->expr_type = EXPR_ARRAY;
476 tail->expr->rank = cmp->as->rank;
478 tail->expr->shape = gfc_get_shape (tail->expr->rank);
479 for (n = 0; n < tail->expr->rank; n++)
481 mpz_init_set_ui (tail->expr->shape[n], 1);
482 mpz_add (tail->expr->shape[n], tail->expr->shape[n],
483 cmp->as->upper[n]->value.integer);
484 mpz_sub (tail->expr->shape[n], tail->expr->shape[n],
485 cmp->as->lower[n]->value.integer);
489 ptr = TREE_INT_CST_LOW (DECL_FIELD_OFFSET (cmp->backend_decl));
490 gfc_target_interpret_expr (&buffer[ptr], buffer_size - ptr,
493 result->value.constructor = head;
496 return int_size_in_bytes (type);
500 /* Read a binary buffer to a constant expression. */
502 gfc_target_interpret_expr (unsigned char *buffer, size_t buffer_size,
505 if (result->expr_type == EXPR_ARRAY)
506 return interpret_array (buffer, buffer_size, result);
508 switch (result->ts.type)
511 result->representation.length =
512 gfc_interpret_integer (result->ts.kind, buffer, buffer_size,
513 result->value.integer);
517 result->representation.length =
518 gfc_interpret_float (result->ts.kind, buffer, buffer_size,
523 result->representation.length =
524 gfc_interpret_complex (result->ts.kind, buffer, buffer_size,
525 result->value.complex);
529 result->representation.length =
530 gfc_interpret_logical (result->ts.kind, buffer, buffer_size,
531 &result->value.logical);
535 result->representation.length =
536 gfc_interpret_character (buffer, buffer_size, result);
540 result->representation.length =
541 gfc_interpret_derived (buffer, buffer_size, result);
545 gfc_internal_error ("Invalid expression in gfc_target_interpret_expr.");
549 if (result->ts.type == BT_CHARACTER)
550 result->representation.string
551 = gfc_widechar_to_char (result->value.character.string,
552 result->value.character.length);
555 result->representation.string =
556 (char *) gfc_getmem (result->representation.length + 1);
557 memcpy (result->representation.string, buffer,
558 result->representation.length);
559 result->representation.string[result->representation.length] = '\0';
562 return result->representation.length;
566 /* --------------------------------------------------------------- */
567 /* Two functions used by trans-common.c to write overlapping
568 equivalence initializers to a buffer. This is added to the union
569 and the original initializers freed. */
572 /* Writes the values of a constant expression to a char buffer. If another
573 unequal initializer has already been written to the buffer, this is an
577 expr_to_char (gfc_expr *e, unsigned char *data, unsigned char *chk, size_t len)
581 gfc_constructor *ctr;
583 unsigned char *buffer;
588 /* Take a derived type, one component at a time, using the offsets from the backend
590 if (e->ts.type == BT_DERIVED)
592 ctr = e->value.constructor;
593 cmp = e->ts.u.derived->components;
594 for (;ctr; ctr = ctr->next, cmp = cmp->next)
596 gcc_assert (cmp && cmp->backend_decl);
599 ptr = TREE_INT_CST_LOW(DECL_FIELD_OFFSET(cmp->backend_decl))
600 + TREE_INT_CST_LOW(DECL_FIELD_BIT_OFFSET(cmp->backend_decl))/8;
601 expr_to_char (ctr->expr, &data[ptr], &chk[ptr], len);
606 /* Otherwise, use the target-memory machinery to write a bitwise image, appropriate
607 to the target, in a buffer and check off the initialized part of the buffer. */
608 len = gfc_target_expr_size (e);
609 buffer = (unsigned char*)alloca (len);
610 len = gfc_target_encode_expr (e, buffer, len);
612 for (i = 0; i < (int)len; i++)
614 if (chk[i] && (buffer[i] != data[i]))
616 gfc_error ("Overlapping unequal initializers in EQUIVALENCE "
623 memcpy (data, buffer, len);
628 /* Writes the values from the equivalence initializers to a char* array
629 that will be written to the constructor to make the initializer for
630 the union declaration. */
633 gfc_merge_initializers (gfc_typespec ts, gfc_expr *e, unsigned char *data,
634 unsigned char *chk, size_t length)
639 switch (e->expr_type)
643 len = expr_to_char (e, &data[0], &chk[0], length);
648 for (c = e->value.constructor; c; c = c->next)
650 size_t elt_size = gfc_target_expr_size (c->expr);
653 len = elt_size * (size_t)mpz_get_si (c->n.offset);
655 len = len + gfc_merge_initializers (ts, c->expr, &data[len],
656 &chk[len], length - len);
668 /* Transfer the bitpattern of a (integer) BOZ to real or complex variables.
669 When successful, no BOZ or nothing to do, true is returned. */
672 gfc_convert_boz (gfc_expr *expr, gfc_typespec *ts)
674 size_t buffer_size, boz_bit_size, ts_bit_size;
676 unsigned char *buffer;
681 gcc_assert (expr->expr_type == EXPR_CONSTANT
682 && expr->ts.type == BT_INTEGER);
684 /* Don't convert BOZ to logical, character, derived etc. */
685 if (ts->type == BT_REAL)
687 buffer_size = size_float (ts->kind);
688 ts_bit_size = buffer_size * 8;
690 else if (ts->type == BT_COMPLEX)
692 buffer_size = size_complex (ts->kind);
693 ts_bit_size = buffer_size * 8 / 2;
698 /* Convert BOZ to the smallest possible integer kind. */
699 boz_bit_size = mpz_sizeinbase (expr->value.integer, 2);
701 if (boz_bit_size > ts_bit_size)
703 gfc_error_now ("BOZ constant at %L is too large (%ld vs %ld bits)",
704 &expr->where, (long) boz_bit_size, (long) ts_bit_size);
708 for (index = 0; gfc_integer_kinds[index].kind != 0; ++index)
709 if ((unsigned) gfc_integer_kinds[index].bit_size >= ts_bit_size)
712 expr->ts.kind = gfc_integer_kinds[index].kind;
713 buffer_size = MAX (buffer_size, size_integer (expr->ts.kind));
715 buffer = (unsigned char*)alloca (buffer_size);
716 encode_integer (expr->ts.kind, expr->value.integer, buffer, buffer_size);
717 mpz_clear (expr->value.integer);
719 if (ts->type == BT_REAL)
721 mpfr_init (expr->value.real);
722 gfc_interpret_float (ts->kind, buffer, buffer_size, expr->value.real);
726 mpc_init2 (expr->value.complex, mpfr_get_default_prec());
727 gfc_interpret_complex (ts->kind, buffer, buffer_size,
728 expr->value.complex);
731 expr->ts.type = ts->type;
732 expr->ts.kind = ts->kind;