1 /* Simulate storage of variables into target memory.
2 Copyright (C) 2007, 2008
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)
83 gfc_target_expr_size (gfc_expr *e)
87 gcc_assert (e != NULL);
89 if (e->expr_type == EXPR_ARRAY)
90 return size_array (e);
95 return size_integer (e->ts.kind);
97 return size_float (e->ts.kind);
99 return size_complex (e->ts.kind);
101 return size_logical (e->ts.kind);
103 if (e->expr_type == EXPR_SUBSTRING && e->ref)
107 gfc_extract_int (e->ref->u.ss.start, &start);
108 gfc_extract_int (e->ref->u.ss.end, &end);
109 return size_character (MAX(end - start + 1, 0), e->ts.kind);
112 return size_character (e->value.character.length, e->ts.kind);
114 return e->representation.length;
116 type = gfc_typenode_for_spec (&e->ts);
117 return int_size_in_bytes (type);
119 gfc_internal_error ("Invalid expression in gfc_target_expr_size.");
125 /* The encode_* functions export a value into a buffer, and
126 return the number of bytes of the buffer that have been
130 encode_array (gfc_expr *expr, unsigned char *buffer, size_t buffer_size)
136 gfc_array_size (expr, &array_size);
137 for (i = 0; i < (int)mpz_get_ui (array_size); i++)
139 ptr += gfc_target_encode_expr (gfc_get_array_element (expr, i),
140 &buffer[ptr], buffer_size - ptr);
143 mpz_clear (array_size);
149 encode_integer (int kind, mpz_t integer, unsigned char *buffer,
152 return native_encode_expr (gfc_conv_mpz_to_tree (integer, kind),
153 buffer, buffer_size);
158 encode_float (int kind, mpfr_t real, unsigned char *buffer, size_t buffer_size)
160 return native_encode_expr (gfc_conv_mpfr_to_tree (real, kind), buffer,
166 encode_complex (int kind, mpfr_t real, mpfr_t imaginary, unsigned char *buffer,
170 size = encode_float (kind, real, &buffer[0], buffer_size);
171 size += encode_float (kind, imaginary, &buffer[size], buffer_size - size);
177 encode_logical (int kind, int logical, unsigned char *buffer, size_t buffer_size)
179 return native_encode_expr (build_int_cst (gfc_get_logical_type (kind),
181 buffer, buffer_size);
186 encode_character (int kind, int length, gfc_char_t *string,
187 unsigned char *buffer, size_t buffer_size)
191 gcc_assert (buffer_size >= size_character (length, kind));
192 /* FIXME -- when we support wide character types, we'll need to go
193 via integers for them. For now, we keep the simple memcpy(). */
194 gcc_assert (kind == gfc_default_character_kind);
196 s = gfc_widechar_to_char (string, length);
197 memcpy (buffer, s, length);
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;
223 gfc_target_encode_expr (ctr->expr, &buffer[ptr],
227 return int_size_in_bytes (type);
231 /* Write a constant expression in binary form to a buffer. */
233 gfc_target_encode_expr (gfc_expr *source, unsigned char *buffer,
239 if (source->expr_type == EXPR_ARRAY)
240 return encode_array (source, buffer, buffer_size);
242 gcc_assert (source->expr_type == EXPR_CONSTANT
243 || source->expr_type == EXPR_STRUCTURE
244 || source->expr_type == EXPR_SUBSTRING);
246 /* If we already have a target-memory representation, we use that rather
247 than recreating one. */
248 if (source->representation.string)
250 memcpy (buffer, source->representation.string,
251 source->representation.length);
252 return source->representation.length;
255 switch (source->ts.type)
258 return encode_integer (source->ts.kind, source->value.integer, buffer,
261 return encode_float (source->ts.kind, source->value.real, buffer,
264 return encode_complex (source->ts.kind, source->value.complex.r,
265 source->value.complex.i, buffer, buffer_size);
267 return encode_logical (source->ts.kind, source->value.logical, buffer,
270 if (source->expr_type == EXPR_CONSTANT || source->ref == NULL)
271 return encode_character (source->ts.kind,
272 source->value.character.length,
273 source->value.character.string, buffer,
279 gcc_assert (source->expr_type == EXPR_SUBSTRING);
280 gfc_extract_int (source->ref->u.ss.start, &start);
281 gfc_extract_int (source->ref->u.ss.end, &end);
282 return encode_character (source->ts.kind,
283 MAX(end - start + 1, 0),
284 &source->value.character.string[start-1],
285 buffer, buffer_size);
289 return encode_derived (source, buffer, buffer_size);
291 gfc_internal_error ("Invalid expression in gfc_target_encode_expr.");
298 interpret_array (unsigned char *buffer, size_t buffer_size, gfc_expr *result)
303 gfc_constructor *head = NULL, *tail = NULL;
305 /* Calculate array size from its shape and rank. */
306 gcc_assert (result->rank > 0 && result->shape);
308 for (i = 0; i < result->rank; i++)
309 array_size *= (int)mpz_get_ui (result->shape[i]);
311 /* Iterate over array elements, producing constructors. */
312 for (i = 0; i < array_size; i++)
315 head = tail = gfc_get_constructor ();
318 tail->next = gfc_get_constructor ();
322 tail->where = result->where;
323 tail->expr = gfc_constant_result (result->ts.type,
324 result->ts.kind, &result->where);
325 tail->expr->ts = result->ts;
327 if (tail->expr->ts.type == BT_CHARACTER)
328 tail->expr->value.character.length = result->value.character.length;
330 ptr += gfc_target_interpret_expr (&buffer[ptr], buffer_size - ptr,
333 result->value.constructor = head;
340 gfc_interpret_integer (int kind, unsigned char *buffer, size_t buffer_size,
344 gfc_conv_tree_to_mpz (integer,
345 native_interpret_expr (gfc_get_int_type (kind),
346 buffer, buffer_size));
347 return size_integer (kind);
352 gfc_interpret_float (int kind, unsigned char *buffer, size_t buffer_size,
356 gfc_conv_tree_to_mpfr (real,
357 native_interpret_expr (gfc_get_real_type (kind),
358 buffer, buffer_size));
360 return size_float (kind);
365 gfc_interpret_complex (int kind, unsigned char *buffer, size_t buffer_size,
366 mpfr_t real, mpfr_t imaginary)
369 size = gfc_interpret_float (kind, &buffer[0], buffer_size, real);
370 size += gfc_interpret_float (kind, &buffer[size], buffer_size - size,
377 gfc_interpret_logical (int kind, unsigned char *buffer, size_t buffer_size,
380 tree t = native_interpret_expr (gfc_get_logical_type (kind), buffer,
382 *logical = double_int_zero_p (tree_to_double_int (t))
384 return size_logical (kind);
389 gfc_interpret_character (unsigned char *buffer, size_t buffer_size,
394 if (result->ts.cl && result->ts.cl->length)
395 result->value.character.length =
396 (int) mpz_get_ui (result->ts.cl->length->value.integer);
398 gcc_assert (buffer_size >= size_character (result->value.character.length,
400 result->value.character.string =
401 gfc_get_wide_string (result->value.character.length + 1);
403 gcc_assert (result->ts.kind == gfc_default_character_kind);
404 for (i = 0; i < result->value.character.length; i++)
405 result->value.character.string[i] = (gfc_char_t) buffer[i];
406 result->value.character.string[result->value.character.length] = '\0';
408 return result->value.character.length;
413 gfc_interpret_derived (unsigned char *buffer, size_t buffer_size, gfc_expr *result)
416 gfc_constructor *head = NULL, *tail = NULL;
420 /* The attributes of the derived type need to be bolted to the floor. */
421 result->expr_type = EXPR_STRUCTURE;
423 type = gfc_typenode_for_spec (&result->ts);
424 cmp = result->ts.derived->components;
426 /* Run through the derived type components. */
427 for (;cmp; cmp = cmp->next)
430 head = tail = gfc_get_constructor ();
433 tail->next = gfc_get_constructor ();
437 /* The constructor points to the component. */
438 tail->n.component = cmp;
440 tail->expr = gfc_constant_result (cmp->ts.type, cmp->ts.kind,
442 tail->expr->ts = cmp->ts;
444 /* Copy shape, if needed. */
445 if (cmp->as && cmp->as->rank)
449 tail->expr->expr_type = EXPR_ARRAY;
450 tail->expr->rank = cmp->as->rank;
452 tail->expr->shape = gfc_get_shape (tail->expr->rank);
453 for (n = 0; n < tail->expr->rank; n++)
455 mpz_init_set_ui (tail->expr->shape[n], 1);
456 mpz_add (tail->expr->shape[n], tail->expr->shape[n],
457 cmp->as->upper[n]->value.integer);
458 mpz_sub (tail->expr->shape[n], tail->expr->shape[n],
459 cmp->as->lower[n]->value.integer);
463 ptr = TREE_INT_CST_LOW (DECL_FIELD_OFFSET (cmp->backend_decl));
464 gfc_target_interpret_expr (&buffer[ptr], buffer_size - ptr,
467 result->value.constructor = head;
470 return int_size_in_bytes (type);
474 /* Read a binary buffer to a constant expression. */
476 gfc_target_interpret_expr (unsigned char *buffer, size_t buffer_size,
479 if (result->expr_type == EXPR_ARRAY)
480 return interpret_array (buffer, buffer_size, result);
482 switch (result->ts.type)
485 result->representation.length =
486 gfc_interpret_integer (result->ts.kind, buffer, buffer_size,
487 result->value.integer);
491 result->representation.length =
492 gfc_interpret_float (result->ts.kind, buffer, buffer_size,
497 result->representation.length =
498 gfc_interpret_complex (result->ts.kind, buffer, buffer_size,
499 result->value.complex.r,
500 result->value.complex.i);
504 result->representation.length =
505 gfc_interpret_logical (result->ts.kind, buffer, buffer_size,
506 &result->value.logical);
510 result->representation.length =
511 gfc_interpret_character (buffer, buffer_size, result);
515 result->representation.length =
516 gfc_interpret_derived (buffer, buffer_size, result);
520 gfc_internal_error ("Invalid expression in gfc_target_interpret_expr.");
524 if (result->ts.type == BT_CHARACTER)
525 result->representation.string
526 = gfc_widechar_to_char (result->value.character.string,
527 result->value.character.length);
530 result->representation.string =
531 gfc_getmem (result->representation.length + 1);
532 memcpy (result->representation.string, buffer,
533 result->representation.length);
534 result->representation.string[result->representation.length] = '\0';
537 return result->representation.length;
541 /* --------------------------------------------------------------- */
542 /* Two functions used by trans-common.c to write overlapping
543 equivalence initializers to a buffer. This is added to the union
544 and the original initializers freed. */
547 /* Writes the values of a constant expression to a char buffer. If another
548 unequal initializer has already been written to the buffer, this is an
552 expr_to_char (gfc_expr *e, unsigned char *data, unsigned char *chk, size_t len)
556 gfc_constructor *ctr;
558 unsigned char *buffer;
563 /* Take a derived type, one component at a time, using the offsets from the backend
565 if (e->ts.type == BT_DERIVED)
567 ctr = e->value.constructor;
568 cmp = e->ts.derived->components;
569 for (;ctr; ctr = ctr->next, cmp = cmp->next)
571 gcc_assert (cmp && cmp->backend_decl);
574 ptr = TREE_INT_CST_LOW(DECL_FIELD_OFFSET(cmp->backend_decl))
575 + TREE_INT_CST_LOW(DECL_FIELD_BIT_OFFSET(cmp->backend_decl))/8;
576 expr_to_char (ctr->expr, &data[ptr], &chk[ptr], len);
581 /* Otherwise, use the target-memory machinery to write a bitwise image, appropriate
582 to the target, in a buffer and check off the initialized part of the buffer. */
583 len = gfc_target_expr_size (e);
584 buffer = (unsigned char*)alloca (len);
585 len = gfc_target_encode_expr (e, buffer, len);
587 for (i = 0; i < (int)len; i++)
589 if (chk[i] && (buffer[i] != data[i]))
591 gfc_error ("Overlapping unequal initializers in EQUIVALENCE "
598 memcpy (data, buffer, len);
603 /* Writes the values from the equivalence initializers to a char* array
604 that will be written to the constructor to make the initializer for
605 the union declaration. */
608 gfc_merge_initializers (gfc_typespec ts, gfc_expr *e, unsigned char *data,
609 unsigned char *chk, size_t length)
614 switch (e->expr_type)
618 len = expr_to_char (e, &data[0], &chk[0], length);
623 for (c = e->value.constructor; c; c = c->next)
625 size_t elt_size = gfc_target_expr_size (c->expr);
628 len = elt_size * (size_t)mpz_get_si (c->n.offset);
630 len = len + gfc_merge_initializers (ts, c->expr, &data[len],
631 &chk[len], length - len);
643 /* Transfer the bitpattern of a (integer) BOZ to real or complex variables.
644 When successful, no BOZ or nothing to do, true is returned. */
647 gfc_convert_boz (gfc_expr *expr, gfc_typespec *ts)
649 size_t buffer_size, boz_bit_size, ts_bit_size;
651 unsigned char *buffer;
656 gcc_assert (expr->expr_type == EXPR_CONSTANT
657 && expr->ts.type == BT_INTEGER);
659 /* Don't convert BOZ to logical, character, derived etc. */
660 if (ts->type == BT_REAL)
662 buffer_size = size_float (ts->kind);
663 ts_bit_size = buffer_size * 8;
665 else if (ts->type == BT_COMPLEX)
667 buffer_size = size_complex (ts->kind);
668 ts_bit_size = buffer_size * 8 / 2;
673 /* Convert BOZ to the smallest possible integer kind. */
674 boz_bit_size = mpz_sizeinbase (expr->value.integer, 2);
676 if (boz_bit_size > ts_bit_size)
678 gfc_error_now ("BOZ constant at %L is too large (%ld vs %ld bits)",
679 &expr->where, (long) boz_bit_size, (long) ts_bit_size);
683 for (index = 0; gfc_integer_kinds[index].kind != 0; ++index)
685 if ((unsigned) gfc_integer_kinds[index].bit_size >= ts_bit_size)
689 expr->ts.kind = gfc_integer_kinds[index].kind;
690 buffer_size = MAX (buffer_size, size_integer (expr->ts.kind));
692 buffer = (unsigned char*)alloca (buffer_size);
693 encode_integer (expr->ts.kind, expr->value.integer, buffer, buffer_size);
694 mpz_clear (expr->value.integer);
696 if (ts->type == BT_REAL)
698 mpfr_init (expr->value.real);
699 gfc_interpret_float (ts->kind, buffer, buffer_size, expr->value.real);
703 mpfr_init (expr->value.complex.r);
704 mpfr_init (expr->value.complex.i);
705 gfc_interpret_complex (ts->kind, buffer, buffer_size,
706 expr->value.complex.r, expr->value.complex.i);
709 expr->ts.type = ts->type;
710 expr->ts.kind = ts->kind;