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, mpfr_t real, mpfr_t imaginary, unsigned char *buffer,
171 size = encode_float (kind, real, &buffer[0], buffer_size);
172 size += encode_float (kind, imaginary, &buffer[size], buffer_size - size);
178 encode_logical (int kind, int logical, unsigned char *buffer, size_t buffer_size)
180 return native_encode_expr (build_int_cst (gfc_get_logical_type (kind),
182 buffer, buffer_size);
187 gfc_encode_character (int kind, int length, const gfc_char_t *string,
188 unsigned char *buffer, size_t buffer_size)
190 size_t elsize = size_character (1, kind);
191 tree type = gfc_get_char_type (kind);
194 gcc_assert (buffer_size >= size_character (length, kind));
196 for (i = 0; i < length; i++)
197 native_encode_expr (build_int_cst (type, string[i]), &buffer[i*elsize],
205 encode_derived (gfc_expr *source, unsigned char *buffer, size_t buffer_size)
207 gfc_constructor *ctr;
212 type = gfc_typenode_for_spec (&source->ts);
214 ctr = source->value.constructor;
215 cmp = source->ts.derived->components;
216 for (;ctr; ctr = ctr->next, cmp = cmp->next)
221 ptr = TREE_INT_CST_LOW(DECL_FIELD_OFFSET(cmp->backend_decl))
222 + TREE_INT_CST_LOW(DECL_FIELD_BIT_OFFSET(cmp->backend_decl))/8;
224 if (ctr->expr->expr_type == EXPR_NULL)
225 memset (&buffer[ptr], 0,
226 int_size_in_bytes (TREE_TYPE (cmp->backend_decl)));
228 gfc_target_encode_expr (ctr->expr, &buffer[ptr],
232 return int_size_in_bytes (type);
236 /* Write a constant expression in binary form to a buffer. */
238 gfc_target_encode_expr (gfc_expr *source, unsigned char *buffer,
244 if (source->expr_type == EXPR_ARRAY)
245 return encode_array (source, buffer, buffer_size);
247 gcc_assert (source->expr_type == EXPR_CONSTANT
248 || source->expr_type == EXPR_STRUCTURE
249 || source->expr_type == EXPR_SUBSTRING);
251 /* If we already have a target-memory representation, we use that rather
252 than recreating one. */
253 if (source->representation.string)
255 memcpy (buffer, source->representation.string,
256 source->representation.length);
257 return source->representation.length;
260 switch (source->ts.type)
263 return encode_integer (source->ts.kind, source->value.integer, buffer,
266 return encode_float (source->ts.kind, source->value.real, buffer,
269 return encode_complex (source->ts.kind, source->value.complex.r,
270 source->value.complex.i, buffer, buffer_size);
272 return encode_logical (source->ts.kind, source->value.logical, buffer,
275 if (source->expr_type == EXPR_CONSTANT || source->ref == NULL)
276 return gfc_encode_character (source->ts.kind,
277 source->value.character.length,
278 source->value.character.string,
279 buffer, buffer_size);
284 gcc_assert (source->expr_type == EXPR_SUBSTRING);
285 gfc_extract_int (source->ref->u.ss.start, &start);
286 gfc_extract_int (source->ref->u.ss.end, &end);
287 return gfc_encode_character (source->ts.kind, MAX(end - start + 1, 0),
288 &source->value.character.string[start-1],
289 buffer, buffer_size);
293 return encode_derived (source, buffer, buffer_size);
295 gfc_internal_error ("Invalid expression in gfc_target_encode_expr.");
302 interpret_array (unsigned char *buffer, size_t buffer_size, gfc_expr *result)
307 gfc_constructor *head = NULL, *tail = NULL;
309 /* Calculate array size from its shape and rank. */
310 gcc_assert (result->rank > 0 && result->shape);
312 for (i = 0; i < result->rank; i++)
313 array_size *= (int)mpz_get_ui (result->shape[i]);
315 /* Iterate over array elements, producing constructors. */
316 for (i = 0; i < array_size; i++)
319 head = tail = gfc_get_constructor ();
322 tail->next = gfc_get_constructor ();
326 tail->where = result->where;
327 tail->expr = gfc_constant_result (result->ts.type,
328 result->ts.kind, &result->where);
329 tail->expr->ts = result->ts;
331 if (tail->expr->ts.type == BT_CHARACTER)
332 tail->expr->value.character.length = result->value.character.length;
334 ptr += gfc_target_interpret_expr (&buffer[ptr], buffer_size - ptr,
337 result->value.constructor = head;
344 gfc_interpret_integer (int kind, unsigned char *buffer, size_t buffer_size,
348 gfc_conv_tree_to_mpz (integer,
349 native_interpret_expr (gfc_get_int_type (kind),
350 buffer, buffer_size));
351 return size_integer (kind);
356 gfc_interpret_float (int kind, unsigned char *buffer, size_t buffer_size,
359 gfc_set_model_kind (kind);
361 gfc_conv_tree_to_mpfr (real,
362 native_interpret_expr (gfc_get_real_type (kind),
363 buffer, buffer_size));
365 return size_float (kind);
370 gfc_interpret_complex (int kind, unsigned char *buffer, size_t buffer_size,
371 mpfr_t real, mpfr_t imaginary)
374 size = gfc_interpret_float (kind, &buffer[0], buffer_size, real);
375 size += gfc_interpret_float (kind, &buffer[size], buffer_size - size,
382 gfc_interpret_logical (int kind, unsigned char *buffer, size_t buffer_size,
385 tree t = native_interpret_expr (gfc_get_logical_type (kind), buffer,
387 *logical = double_int_zero_p (tree_to_double_int (t))
389 return size_logical (kind);
394 gfc_interpret_character (unsigned char *buffer, size_t buffer_size,
399 if (result->ts.cl && result->ts.cl->length)
400 result->value.character.length =
401 (int) mpz_get_ui (result->ts.cl->length->value.integer);
403 gcc_assert (buffer_size >= size_character (result->value.character.length,
405 result->value.character.string =
406 gfc_get_wide_string (result->value.character.length + 1);
408 if (result->ts.kind == gfc_default_character_kind)
409 for (i = 0; i < result->value.character.length; i++)
410 result->value.character.string[i] = (gfc_char_t) buffer[i];
414 unsigned bytes = size_character (1, result->ts.kind);
416 gcc_assert (bytes <= sizeof (unsigned long));
418 for (i = 0; i < result->value.character.length; i++)
420 gfc_conv_tree_to_mpz (integer,
421 native_interpret_expr (gfc_get_char_type (result->ts.kind),
422 &buffer[bytes*i], buffer_size-bytes*i));
423 result->value.character.string[i]
424 = (gfc_char_t) mpz_get_ui (integer);
430 result->value.character.string[result->value.character.length] = '\0';
432 return result->value.character.length;
437 gfc_interpret_derived (unsigned char *buffer, size_t buffer_size, gfc_expr *result)
440 gfc_constructor *head = NULL, *tail = NULL;
444 /* The attributes of the derived type need to be bolted to the floor. */
445 result->expr_type = EXPR_STRUCTURE;
447 type = gfc_typenode_for_spec (&result->ts);
448 cmp = result->ts.derived->components;
450 /* Run through the derived type components. */
451 for (;cmp; cmp = cmp->next)
454 head = tail = gfc_get_constructor ();
457 tail->next = gfc_get_constructor ();
461 /* The constructor points to the component. */
462 tail->n.component = cmp;
464 tail->expr = gfc_constant_result (cmp->ts.type, cmp->ts.kind,
466 tail->expr->ts = cmp->ts;
468 /* Copy shape, if needed. */
469 if (cmp->as && cmp->as->rank)
473 tail->expr->expr_type = EXPR_ARRAY;
474 tail->expr->rank = cmp->as->rank;
476 tail->expr->shape = gfc_get_shape (tail->expr->rank);
477 for (n = 0; n < tail->expr->rank; n++)
479 mpz_init_set_ui (tail->expr->shape[n], 1);
480 mpz_add (tail->expr->shape[n], tail->expr->shape[n],
481 cmp->as->upper[n]->value.integer);
482 mpz_sub (tail->expr->shape[n], tail->expr->shape[n],
483 cmp->as->lower[n]->value.integer);
487 ptr = TREE_INT_CST_LOW (DECL_FIELD_OFFSET (cmp->backend_decl));
488 gfc_target_interpret_expr (&buffer[ptr], buffer_size - ptr,
491 result->value.constructor = head;
494 return int_size_in_bytes (type);
498 /* Read a binary buffer to a constant expression. */
500 gfc_target_interpret_expr (unsigned char *buffer, size_t buffer_size,
503 if (result->expr_type == EXPR_ARRAY)
504 return interpret_array (buffer, buffer_size, result);
506 switch (result->ts.type)
509 result->representation.length =
510 gfc_interpret_integer (result->ts.kind, buffer, buffer_size,
511 result->value.integer);
515 result->representation.length =
516 gfc_interpret_float (result->ts.kind, buffer, buffer_size,
521 result->representation.length =
522 gfc_interpret_complex (result->ts.kind, buffer, buffer_size,
523 result->value.complex.r,
524 result->value.complex.i);
528 result->representation.length =
529 gfc_interpret_logical (result->ts.kind, buffer, buffer_size,
530 &result->value.logical);
534 result->representation.length =
535 gfc_interpret_character (buffer, buffer_size, result);
539 result->representation.length =
540 gfc_interpret_derived (buffer, buffer_size, result);
544 gfc_internal_error ("Invalid expression in gfc_target_interpret_expr.");
548 if (result->ts.type == BT_CHARACTER)
549 result->representation.string
550 = gfc_widechar_to_char (result->value.character.string,
551 result->value.character.length);
554 result->representation.string =
555 (char *) gfc_getmem (result->representation.length + 1);
556 memcpy (result->representation.string, buffer,
557 result->representation.length);
558 result->representation.string[result->representation.length] = '\0';
561 return result->representation.length;
565 /* --------------------------------------------------------------- */
566 /* Two functions used by trans-common.c to write overlapping
567 equivalence initializers to a buffer. This is added to the union
568 and the original initializers freed. */
571 /* Writes the values of a constant expression to a char buffer. If another
572 unequal initializer has already been written to the buffer, this is an
576 expr_to_char (gfc_expr *e, unsigned char *data, unsigned char *chk, size_t len)
580 gfc_constructor *ctr;
582 unsigned char *buffer;
587 /* Take a derived type, one component at a time, using the offsets from the backend
589 if (e->ts.type == BT_DERIVED)
591 ctr = e->value.constructor;
592 cmp = e->ts.derived->components;
593 for (;ctr; ctr = ctr->next, cmp = cmp->next)
595 gcc_assert (cmp && cmp->backend_decl);
598 ptr = TREE_INT_CST_LOW(DECL_FIELD_OFFSET(cmp->backend_decl))
599 + TREE_INT_CST_LOW(DECL_FIELD_BIT_OFFSET(cmp->backend_decl))/8;
600 expr_to_char (ctr->expr, &data[ptr], &chk[ptr], len);
605 /* Otherwise, use the target-memory machinery to write a bitwise image, appropriate
606 to the target, in a buffer and check off the initialized part of the buffer. */
607 len = gfc_target_expr_size (e);
608 buffer = (unsigned char*)alloca (len);
609 len = gfc_target_encode_expr (e, buffer, len);
611 for (i = 0; i < (int)len; i++)
613 if (chk[i] && (buffer[i] != data[i]))
615 gfc_error ("Overlapping unequal initializers in EQUIVALENCE "
622 memcpy (data, buffer, len);
627 /* Writes the values from the equivalence initializers to a char* array
628 that will be written to the constructor to make the initializer for
629 the union declaration. */
632 gfc_merge_initializers (gfc_typespec ts, gfc_expr *e, unsigned char *data,
633 unsigned char *chk, size_t length)
638 switch (e->expr_type)
642 len = expr_to_char (e, &data[0], &chk[0], length);
647 for (c = e->value.constructor; c; c = c->next)
649 size_t elt_size = gfc_target_expr_size (c->expr);
652 len = elt_size * (size_t)mpz_get_si (c->n.offset);
654 len = len + gfc_merge_initializers (ts, c->expr, &data[len],
655 &chk[len], length - len);
667 /* Transfer the bitpattern of a (integer) BOZ to real or complex variables.
668 When successful, no BOZ or nothing to do, true is returned. */
671 gfc_convert_boz (gfc_expr *expr, gfc_typespec *ts)
673 size_t buffer_size, boz_bit_size, ts_bit_size;
675 unsigned char *buffer;
680 gcc_assert (expr->expr_type == EXPR_CONSTANT
681 && expr->ts.type == BT_INTEGER);
683 /* Don't convert BOZ to logical, character, derived etc. */
684 if (ts->type == BT_REAL)
686 buffer_size = size_float (ts->kind);
687 ts_bit_size = buffer_size * 8;
689 else if (ts->type == BT_COMPLEX)
691 buffer_size = size_complex (ts->kind);
692 ts_bit_size = buffer_size * 8 / 2;
697 /* Convert BOZ to the smallest possible integer kind. */
698 boz_bit_size = mpz_sizeinbase (expr->value.integer, 2);
700 if (boz_bit_size > ts_bit_size)
702 gfc_error_now ("BOZ constant at %L is too large (%ld vs %ld bits)",
703 &expr->where, (long) boz_bit_size, (long) ts_bit_size);
707 for (index = 0; gfc_integer_kinds[index].kind != 0; ++index)
708 if ((unsigned) gfc_integer_kinds[index].bit_size >= ts_bit_size)
711 expr->ts.kind = gfc_integer_kinds[index].kind;
712 buffer_size = MAX (buffer_size, size_integer (expr->ts.kind));
714 buffer = (unsigned char*)alloca (buffer_size);
715 encode_integer (expr->ts.kind, expr->value.integer, buffer, buffer_size);
716 mpz_clear (expr->value.integer);
718 if (ts->type == BT_REAL)
720 mpfr_init (expr->value.real);
721 gfc_interpret_float (ts->kind, buffer, buffer_size, expr->value.real);
725 mpfr_init (expr->value.complex.r);
726 mpfr_init (expr->value.complex.i);
727 gfc_interpret_complex (ts->kind, buffer, buffer_size,
728 expr->value.complex.r, expr->value.complex.i);
731 expr->ts.type = ts->type;
732 expr->ts.kind = ts->kind;