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,
171 mpfr_t real, mpfr_t imaginary,
173 unsigned char *buffer, size_t buffer_size)
176 size = encode_float (kind,
182 &buffer[0], buffer_size);
183 size += encode_float (kind,
189 &buffer[size], buffer_size - size);
195 encode_logical (int kind, int logical, unsigned char *buffer, size_t buffer_size)
197 return native_encode_expr (build_int_cst (gfc_get_logical_type (kind),
199 buffer, buffer_size);
204 gfc_encode_character (int kind, int length, const gfc_char_t *string,
205 unsigned char *buffer, size_t buffer_size)
207 size_t elsize = size_character (1, kind);
208 tree type = gfc_get_char_type (kind);
211 gcc_assert (buffer_size >= size_character (length, kind));
213 for (i = 0; i < length; i++)
214 native_encode_expr (build_int_cst (type, string[i]), &buffer[i*elsize],
222 encode_derived (gfc_expr *source, unsigned char *buffer, size_t buffer_size)
224 gfc_constructor *ctr;
229 type = gfc_typenode_for_spec (&source->ts);
231 ctr = source->value.constructor;
232 cmp = source->ts.derived->components;
233 for (;ctr; ctr = ctr->next, cmp = cmp->next)
238 ptr = TREE_INT_CST_LOW(DECL_FIELD_OFFSET(cmp->backend_decl))
239 + TREE_INT_CST_LOW(DECL_FIELD_BIT_OFFSET(cmp->backend_decl))/8;
241 if (ctr->expr->expr_type == EXPR_NULL)
242 memset (&buffer[ptr], 0,
243 int_size_in_bytes (TREE_TYPE (cmp->backend_decl)));
245 gfc_target_encode_expr (ctr->expr, &buffer[ptr],
249 return int_size_in_bytes (type);
253 /* Write a constant expression in binary form to a buffer. */
255 gfc_target_encode_expr (gfc_expr *source, unsigned char *buffer,
261 if (source->expr_type == EXPR_ARRAY)
262 return encode_array (source, buffer, buffer_size);
264 gcc_assert (source->expr_type == EXPR_CONSTANT
265 || source->expr_type == EXPR_STRUCTURE
266 || source->expr_type == EXPR_SUBSTRING);
268 /* If we already have a target-memory representation, we use that rather
269 than recreating one. */
270 if (source->representation.string)
272 memcpy (buffer, source->representation.string,
273 source->representation.length);
274 return source->representation.length;
277 switch (source->ts.type)
280 return encode_integer (source->ts.kind, source->value.integer, buffer,
283 return encode_float (source->ts.kind, source->value.real, buffer,
286 return encode_complex (source->ts.kind,
288 source->value.complex,
290 source->value.complex.r,
291 source->value.complex.i,
293 buffer, buffer_size);
295 return encode_logical (source->ts.kind, source->value.logical, buffer,
298 if (source->expr_type == EXPR_CONSTANT || source->ref == NULL)
299 return gfc_encode_character (source->ts.kind,
300 source->value.character.length,
301 source->value.character.string,
302 buffer, buffer_size);
307 gcc_assert (source->expr_type == EXPR_SUBSTRING);
308 gfc_extract_int (source->ref->u.ss.start, &start);
309 gfc_extract_int (source->ref->u.ss.end, &end);
310 return gfc_encode_character (source->ts.kind, MAX(end - start + 1, 0),
311 &source->value.character.string[start-1],
312 buffer, buffer_size);
316 return encode_derived (source, buffer, buffer_size);
318 gfc_internal_error ("Invalid expression in gfc_target_encode_expr.");
325 interpret_array (unsigned char *buffer, size_t buffer_size, gfc_expr *result)
330 gfc_constructor *head = NULL, *tail = NULL;
332 /* Calculate array size from its shape and rank. */
333 gcc_assert (result->rank > 0 && result->shape);
335 for (i = 0; i < result->rank; i++)
336 array_size *= (int)mpz_get_ui (result->shape[i]);
338 /* Iterate over array elements, producing constructors. */
339 for (i = 0; i < array_size; i++)
342 head = tail = gfc_get_constructor ();
345 tail->next = gfc_get_constructor ();
349 tail->where = result->where;
350 tail->expr = gfc_constant_result (result->ts.type,
351 result->ts.kind, &result->where);
352 tail->expr->ts = result->ts;
354 if (tail->expr->ts.type == BT_CHARACTER)
355 tail->expr->value.character.length = result->value.character.length;
357 ptr += gfc_target_interpret_expr (&buffer[ptr], buffer_size - ptr,
360 result->value.constructor = head;
367 gfc_interpret_integer (int kind, unsigned char *buffer, size_t buffer_size,
371 gfc_conv_tree_to_mpz (integer,
372 native_interpret_expr (gfc_get_int_type (kind),
373 buffer, buffer_size));
374 return size_integer (kind);
379 gfc_interpret_float (int kind, unsigned char *buffer, size_t buffer_size,
382 gfc_set_model_kind (kind);
384 gfc_conv_tree_to_mpfr (real,
385 native_interpret_expr (gfc_get_real_type (kind),
386 buffer, buffer_size));
388 return size_float (kind);
393 gfc_interpret_complex (int kind, unsigned char *buffer, size_t buffer_size,
397 mpfr_t real, mpfr_t imaginary
402 size = gfc_interpret_float (kind, &buffer[0], buffer_size,
404 mpc_realref (complex)
409 size += gfc_interpret_float (kind, &buffer[size], buffer_size - size,
411 mpc_imagref (complex)
421 gfc_interpret_logical (int kind, unsigned char *buffer, size_t buffer_size,
424 tree t = native_interpret_expr (gfc_get_logical_type (kind), buffer,
426 *logical = double_int_zero_p (tree_to_double_int (t))
428 return size_logical (kind);
433 gfc_interpret_character (unsigned char *buffer, size_t buffer_size,
438 if (result->ts.cl && result->ts.cl->length)
439 result->value.character.length =
440 (int) mpz_get_ui (result->ts.cl->length->value.integer);
442 gcc_assert (buffer_size >= size_character (result->value.character.length,
444 result->value.character.string =
445 gfc_get_wide_string (result->value.character.length + 1);
447 if (result->ts.kind == gfc_default_character_kind)
448 for (i = 0; i < result->value.character.length; i++)
449 result->value.character.string[i] = (gfc_char_t) buffer[i];
453 unsigned bytes = size_character (1, result->ts.kind);
455 gcc_assert (bytes <= sizeof (unsigned long));
457 for (i = 0; i < result->value.character.length; i++)
459 gfc_conv_tree_to_mpz (integer,
460 native_interpret_expr (gfc_get_char_type (result->ts.kind),
461 &buffer[bytes*i], buffer_size-bytes*i));
462 result->value.character.string[i]
463 = (gfc_char_t) mpz_get_ui (integer);
469 result->value.character.string[result->value.character.length] = '\0';
471 return result->value.character.length;
476 gfc_interpret_derived (unsigned char *buffer, size_t buffer_size, gfc_expr *result)
479 gfc_constructor *head = NULL, *tail = NULL;
483 /* The attributes of the derived type need to be bolted to the floor. */
484 result->expr_type = EXPR_STRUCTURE;
486 type = gfc_typenode_for_spec (&result->ts);
487 cmp = result->ts.derived->components;
489 /* Run through the derived type components. */
490 for (;cmp; cmp = cmp->next)
493 head = tail = gfc_get_constructor ();
496 tail->next = gfc_get_constructor ();
500 /* The constructor points to the component. */
501 tail->n.component = cmp;
503 tail->expr = gfc_constant_result (cmp->ts.type, cmp->ts.kind,
505 tail->expr->ts = cmp->ts;
507 /* Copy shape, if needed. */
508 if (cmp->as && cmp->as->rank)
512 tail->expr->expr_type = EXPR_ARRAY;
513 tail->expr->rank = cmp->as->rank;
515 tail->expr->shape = gfc_get_shape (tail->expr->rank);
516 for (n = 0; n < tail->expr->rank; n++)
518 mpz_init_set_ui (tail->expr->shape[n], 1);
519 mpz_add (tail->expr->shape[n], tail->expr->shape[n],
520 cmp->as->upper[n]->value.integer);
521 mpz_sub (tail->expr->shape[n], tail->expr->shape[n],
522 cmp->as->lower[n]->value.integer);
526 ptr = TREE_INT_CST_LOW (DECL_FIELD_OFFSET (cmp->backend_decl));
527 gfc_target_interpret_expr (&buffer[ptr], buffer_size - ptr,
530 result->value.constructor = head;
533 return int_size_in_bytes (type);
537 /* Read a binary buffer to a constant expression. */
539 gfc_target_interpret_expr (unsigned char *buffer, size_t buffer_size,
542 if (result->expr_type == EXPR_ARRAY)
543 return interpret_array (buffer, buffer_size, result);
545 switch (result->ts.type)
548 result->representation.length =
549 gfc_interpret_integer (result->ts.kind, buffer, buffer_size,
550 result->value.integer);
554 result->representation.length =
555 gfc_interpret_float (result->ts.kind, buffer, buffer_size,
560 result->representation.length =
561 gfc_interpret_complex (result->ts.kind, buffer, buffer_size,
563 result->value.complex
565 result->value.complex.r,
566 result->value.complex.i
572 result->representation.length =
573 gfc_interpret_logical (result->ts.kind, buffer, buffer_size,
574 &result->value.logical);
578 result->representation.length =
579 gfc_interpret_character (buffer, buffer_size, result);
583 result->representation.length =
584 gfc_interpret_derived (buffer, buffer_size, result);
588 gfc_internal_error ("Invalid expression in gfc_target_interpret_expr.");
592 if (result->ts.type == BT_CHARACTER)
593 result->representation.string
594 = gfc_widechar_to_char (result->value.character.string,
595 result->value.character.length);
598 result->representation.string =
599 (char *) gfc_getmem (result->representation.length + 1);
600 memcpy (result->representation.string, buffer,
601 result->representation.length);
602 result->representation.string[result->representation.length] = '\0';
605 return result->representation.length;
609 /* --------------------------------------------------------------- */
610 /* Two functions used by trans-common.c to write overlapping
611 equivalence initializers to a buffer. This is added to the union
612 and the original initializers freed. */
615 /* Writes the values of a constant expression to a char buffer. If another
616 unequal initializer has already been written to the buffer, this is an
620 expr_to_char (gfc_expr *e, unsigned char *data, unsigned char *chk, size_t len)
624 gfc_constructor *ctr;
626 unsigned char *buffer;
631 /* Take a derived type, one component at a time, using the offsets from the backend
633 if (e->ts.type == BT_DERIVED)
635 ctr = e->value.constructor;
636 cmp = e->ts.derived->components;
637 for (;ctr; ctr = ctr->next, cmp = cmp->next)
639 gcc_assert (cmp && cmp->backend_decl);
642 ptr = TREE_INT_CST_LOW(DECL_FIELD_OFFSET(cmp->backend_decl))
643 + TREE_INT_CST_LOW(DECL_FIELD_BIT_OFFSET(cmp->backend_decl))/8;
644 expr_to_char (ctr->expr, &data[ptr], &chk[ptr], len);
649 /* Otherwise, use the target-memory machinery to write a bitwise image, appropriate
650 to the target, in a buffer and check off the initialized part of the buffer. */
651 len = gfc_target_expr_size (e);
652 buffer = (unsigned char*)alloca (len);
653 len = gfc_target_encode_expr (e, buffer, len);
655 for (i = 0; i < (int)len; i++)
657 if (chk[i] && (buffer[i] != data[i]))
659 gfc_error ("Overlapping unequal initializers in EQUIVALENCE "
666 memcpy (data, buffer, len);
671 /* Writes the values from the equivalence initializers to a char* array
672 that will be written to the constructor to make the initializer for
673 the union declaration. */
676 gfc_merge_initializers (gfc_typespec ts, gfc_expr *e, unsigned char *data,
677 unsigned char *chk, size_t length)
682 switch (e->expr_type)
686 len = expr_to_char (e, &data[0], &chk[0], length);
691 for (c = e->value.constructor; c; c = c->next)
693 size_t elt_size = gfc_target_expr_size (c->expr);
696 len = elt_size * (size_t)mpz_get_si (c->n.offset);
698 len = len + gfc_merge_initializers (ts, c->expr, &data[len],
699 &chk[len], length - len);
711 /* Transfer the bitpattern of a (integer) BOZ to real or complex variables.
712 When successful, no BOZ or nothing to do, true is returned. */
715 gfc_convert_boz (gfc_expr *expr, gfc_typespec *ts)
717 size_t buffer_size, boz_bit_size, ts_bit_size;
719 unsigned char *buffer;
724 gcc_assert (expr->expr_type == EXPR_CONSTANT
725 && expr->ts.type == BT_INTEGER);
727 /* Don't convert BOZ to logical, character, derived etc. */
728 if (ts->type == BT_REAL)
730 buffer_size = size_float (ts->kind);
731 ts_bit_size = buffer_size * 8;
733 else if (ts->type == BT_COMPLEX)
735 buffer_size = size_complex (ts->kind);
736 ts_bit_size = buffer_size * 8 / 2;
741 /* Convert BOZ to the smallest possible integer kind. */
742 boz_bit_size = mpz_sizeinbase (expr->value.integer, 2);
744 if (boz_bit_size > ts_bit_size)
746 gfc_error_now ("BOZ constant at %L is too large (%ld vs %ld bits)",
747 &expr->where, (long) boz_bit_size, (long) ts_bit_size);
751 for (index = 0; gfc_integer_kinds[index].kind != 0; ++index)
752 if ((unsigned) gfc_integer_kinds[index].bit_size >= ts_bit_size)
755 expr->ts.kind = gfc_integer_kinds[index].kind;
756 buffer_size = MAX (buffer_size, size_integer (expr->ts.kind));
758 buffer = (unsigned char*)alloca (buffer_size);
759 encode_integer (expr->ts.kind, expr->value.integer, buffer, buffer_size);
760 mpz_clear (expr->value.integer);
762 if (ts->type == BT_REAL)
764 mpfr_init (expr->value.real);
765 gfc_interpret_float (ts->kind, buffer, buffer_size, expr->value.real);
770 mpc_init2 (expr->value.complex, mpfr_get_default_prec());
772 mpfr_init (expr->value.complex.r);
773 mpfr_init (expr->value.complex.i);
775 gfc_interpret_complex (ts->kind, buffer, buffer_size,
779 expr->value.complex.r, expr->value.complex.i
784 expr->ts.type = ts->type;
785 expr->ts.kind = ts->kind;