1 /* Simulate storage of variables into target memory.
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 2, 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 COPYING. If not, write to the Free
20 Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
31 #include "trans-const.h"
32 #include "trans-types.h"
33 #include "target-memory.h"
35 /* --------------------------------------------------------------- */
36 /* Calculate the size of an expression. */
39 size_array (gfc_expr *e)
42 size_t elt_size = gfc_target_expr_size (e->value.constructor->expr);
44 gfc_array_size (e, &array_size);
45 return (size_t)mpz_get_ui (array_size) * elt_size;
49 size_integer (int kind)
51 return GET_MODE_SIZE (TYPE_MODE (gfc_get_int_type (kind)));;
58 return GET_MODE_SIZE (TYPE_MODE (gfc_get_real_type (kind)));;
63 size_complex (int kind)
65 return 2 * size_float (kind);
70 size_logical (int kind)
72 return GET_MODE_SIZE (TYPE_MODE (gfc_get_logical_type (kind)));;
77 size_character (int length)
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 return size_character (e->value.character.length);
106 return e->representation.length;
108 type = gfc_typenode_for_spec (&e->ts);
109 return int_size_in_bytes (type);
111 gfc_internal_error ("Invalid expression in gfc_target_expr_size.");
117 /* The encode_* functions export a value into a buffer, and
118 return the number of bytes of the buffer that have been
122 encode_array (gfc_expr *expr, unsigned char *buffer, size_t buffer_size)
128 gfc_array_size (expr, &array_size);
129 for (i = 0; i < (int)mpz_get_ui (array_size); i++)
131 ptr += gfc_target_encode_expr (gfc_get_array_element (expr, i),
132 &buffer[ptr], buffer_size - ptr);
135 mpz_clear (array_size);
141 encode_integer (int kind, mpz_t integer, unsigned char *buffer,
144 return native_encode_expr (gfc_conv_mpz_to_tree (integer, kind),
145 buffer, buffer_size);
150 encode_float (int kind, mpfr_t real, unsigned char *buffer, size_t buffer_size)
152 return native_encode_expr (gfc_conv_mpfr_to_tree (real, kind), buffer,
158 encode_complex (int kind, mpfr_t real, mpfr_t imaginary, unsigned char *buffer,
162 size = encode_float (kind, real, &buffer[0], buffer_size);
163 size += encode_float (kind, imaginary, &buffer[size], buffer_size - size);
169 encode_logical (int kind, int logical, unsigned char *buffer, size_t buffer_size)
171 return native_encode_expr (build_int_cst (gfc_get_logical_type (kind),
173 buffer, buffer_size);
178 encode_character (int length, char *string, unsigned char *buffer,
181 gcc_assert (buffer_size >= size_character (length));
182 memcpy (buffer, string, length);
188 encode_derived (gfc_expr *source, unsigned char *buffer, size_t buffer_size)
190 gfc_constructor *ctr;
195 type = gfc_typenode_for_spec (&source->ts);
197 ctr = source->value.constructor;
198 cmp = source->ts.derived->components;
199 for (;ctr; ctr = ctr->next, cmp = cmp->next)
204 ptr = TREE_INT_CST_LOW(DECL_FIELD_OFFSET(cmp->backend_decl))
205 + TREE_INT_CST_LOW(DECL_FIELD_BIT_OFFSET(cmp->backend_decl))/8;
206 gfc_target_encode_expr (ctr->expr, &buffer[ptr],
210 return int_size_in_bytes (type);
214 /* Write a constant expression in binary form to a buffer. */
216 gfc_target_encode_expr (gfc_expr *source, unsigned char *buffer,
222 if (source->expr_type == EXPR_ARRAY)
223 return encode_array (source, buffer, buffer_size);
225 gcc_assert (source->expr_type == EXPR_CONSTANT
226 || source->expr_type == EXPR_STRUCTURE);
228 /* If we already have a target-memory representation, we use that rather
229 than recreating one. */
230 if (source->representation.string)
232 memcpy (buffer, source->representation.string,
233 source->representation.length);
234 return source->representation.length;
237 switch (source->ts.type)
240 return encode_integer (source->ts.kind, source->value.integer, buffer,
243 return encode_float (source->ts.kind, source->value.real, buffer,
246 return encode_complex (source->ts.kind, source->value.complex.r,
247 source->value.complex.i, buffer, buffer_size);
249 return encode_logical (source->ts.kind, source->value.logical, buffer,
252 return encode_character (source->value.character.length,
253 source->value.character.string, buffer,
256 return encode_derived (source, buffer, buffer_size);
258 gfc_internal_error ("Invalid expression in gfc_target_encode_expr.");
265 interpret_array (unsigned char *buffer, size_t buffer_size, gfc_expr *result)
270 gfc_constructor *head = NULL, *tail = NULL;
272 /* Calculate array size from its shape and rank. */
273 gcc_assert (result->rank > 0 && result->shape);
275 for (i = 0; i < result->rank; i++)
276 array_size *= (int)mpz_get_ui (result->shape[i]);
278 /* Iterate over array elements, producing constructors. */
279 for (i = 0; i < array_size; i++)
282 head = tail = gfc_get_constructor ();
285 tail->next = gfc_get_constructor ();
289 tail->where = result->where;
290 tail->expr = gfc_constant_result (result->ts.type,
291 result->ts.kind, &result->where);
292 tail->expr->ts = result->ts;
294 if (tail->expr->ts.type == BT_CHARACTER)
295 tail->expr->value.character.length = result->value.character.length;
297 ptr += gfc_target_interpret_expr (&buffer[ptr], buffer_size - ptr,
300 result->value.constructor = head;
307 gfc_interpret_integer (int kind, unsigned char *buffer, size_t buffer_size,
311 gfc_conv_tree_to_mpz (integer,
312 native_interpret_expr (gfc_get_int_type (kind),
313 buffer, buffer_size));
314 return size_integer (kind);
319 gfc_interpret_float (int kind, unsigned char *buffer, size_t buffer_size,
323 gfc_conv_tree_to_mpfr (real,
324 native_interpret_expr (gfc_get_real_type (kind),
325 buffer, buffer_size));
327 return size_float (kind);
332 gfc_interpret_complex (int kind, unsigned char *buffer, size_t buffer_size,
333 mpfr_t real, mpfr_t imaginary)
336 size = gfc_interpret_float (kind, &buffer[0], buffer_size, real);
337 size += gfc_interpret_float (kind, &buffer[size], buffer_size - size, imaginary);
343 gfc_interpret_logical (int kind, unsigned char *buffer, size_t buffer_size,
346 tree t = native_interpret_expr (gfc_get_logical_type (kind), buffer,
348 *logical = double_int_zero_p (tree_to_double_int (t))
350 return size_logical (kind);
355 gfc_interpret_character (unsigned char *buffer, size_t buffer_size, gfc_expr *result)
357 if (result->ts.cl && result->ts.cl->length)
358 result->value.character.length =
359 (int)mpz_get_ui (result->ts.cl->length->value.integer);
361 gcc_assert (buffer_size >= size_character (result->value.character.length));
362 result->value.character.string =
363 gfc_getmem (result->value.character.length + 1);
364 memcpy (result->value.character.string, buffer,
365 result->value.character.length);
366 result->value.character.string [result->value.character.length] = '\0';
368 return result->value.character.length;
373 gfc_interpret_derived (unsigned char *buffer, size_t buffer_size, gfc_expr *result)
376 gfc_constructor *head = NULL, *tail = NULL;
380 /* The attributes of the derived type need to be bolted to the floor. */
381 result->expr_type = EXPR_STRUCTURE;
383 type = gfc_typenode_for_spec (&result->ts);
384 cmp = result->ts.derived->components;
386 /* Run through the derived type components. */
387 for (;cmp; cmp = cmp->next)
390 head = tail = gfc_get_constructor ();
393 tail->next = gfc_get_constructor ();
397 /* The constructor points to the component. */
398 tail->n.component = cmp;
400 tail->expr = gfc_constant_result (cmp->ts.type, cmp->ts.kind,
402 tail->expr->ts = cmp->ts;
404 /* Copy shape, if needed. */
405 if (cmp->as && cmp->as->rank)
409 tail->expr->expr_type = EXPR_ARRAY;
410 tail->expr->rank = cmp->as->rank;
412 tail->expr->shape = gfc_get_shape (tail->expr->rank);
413 for (n = 0; n < tail->expr->rank; n++)
415 mpz_init_set_ui (tail->expr->shape[n], 1);
416 mpz_add (tail->expr->shape[n], tail->expr->shape[n],
417 cmp->as->upper[n]->value.integer);
418 mpz_sub (tail->expr->shape[n], tail->expr->shape[n],
419 cmp->as->lower[n]->value.integer);
423 ptr = TREE_INT_CST_LOW (DECL_FIELD_OFFSET (cmp->backend_decl));
424 gfc_target_interpret_expr (&buffer[ptr], buffer_size - ptr,
427 result->value.constructor = head;
430 return int_size_in_bytes (type);
434 /* Read a binary buffer to a constant expression. */
436 gfc_target_interpret_expr (unsigned char *buffer, size_t buffer_size,
439 if (result->expr_type == EXPR_ARRAY)
440 return interpret_array (buffer, buffer_size, result);
442 switch (result->ts.type)
445 result->representation.length =
446 gfc_interpret_integer (result->ts.kind, buffer, buffer_size,
447 result->value.integer);
451 result->representation.length =
452 gfc_interpret_float (result->ts.kind, buffer, buffer_size,
457 result->representation.length =
458 gfc_interpret_complex (result->ts.kind, buffer, buffer_size,
459 result->value.complex.r,
460 result->value.complex.i);
464 result->representation.length =
465 gfc_interpret_logical (result->ts.kind, buffer, buffer_size,
466 &result->value.logical);
470 result->representation.length =
471 gfc_interpret_character (buffer, buffer_size, result);
475 result->representation.length =
476 gfc_interpret_derived (buffer, buffer_size, result);
480 gfc_internal_error ("Invalid expression in gfc_target_interpret_expr.");
484 if (result->ts.type == BT_CHARACTER)
485 result->representation.string = result->value.character.string;
488 result->representation.string =
489 gfc_getmem (result->representation.length + 1);
490 memcpy (result->representation.string, buffer,
491 result->representation.length);
492 result->representation.string[result->representation.length] = '\0';
495 return result->representation.length;
499 /* --------------------------------------------------------------- */
500 /* Two functions used by trans-common.c to write overlapping
501 equivalence initializers to a buffer. This is added to the union
502 and the original initializers freed. */
505 /* Writes the values of a constant expression to a char buffer. If another
506 unequal initializer has already been written to the buffer, this is an
510 expr_to_char (gfc_expr *e, unsigned char *data, unsigned char *chk, size_t len)
514 gfc_constructor *ctr;
516 unsigned char *buffer;
521 /* Take a derived type, one component at a time, using the offsets from the backend
523 if (e->ts.type == BT_DERIVED)
525 ctr = e->value.constructor;
526 cmp = e->ts.derived->components;
527 for (;ctr; ctr = ctr->next, cmp = cmp->next)
529 gcc_assert (cmp && cmp->backend_decl);
532 ptr = TREE_INT_CST_LOW(DECL_FIELD_OFFSET(cmp->backend_decl))
533 + TREE_INT_CST_LOW(DECL_FIELD_BIT_OFFSET(cmp->backend_decl))/8;
534 expr_to_char (ctr->expr, &data[ptr], &chk[ptr], len);
539 /* Otherwise, use the target-memory machinery to write a bitwise image, appropriate
540 to the target, in a buffer and check off the initialized part of the buffer. */
541 len = gfc_target_expr_size (e);
542 buffer = (unsigned char*)alloca (len);
543 len = gfc_target_encode_expr (e, buffer, len);
545 for (i = 0; i < (int)len; i++)
547 if (chk[i] && (buffer[i] != data[i]))
549 gfc_error ("Overlapping unequal initializers in EQUIVALENCE "
556 memcpy (data, buffer, len);
561 /* Writes the values from the equivalence initializers to a char* array
562 that will be written to the constructor to make the initializer for
563 the union declaration. */
566 gfc_merge_initializers (gfc_typespec ts, gfc_expr *e, unsigned char *data,
567 unsigned char *chk, size_t length)
572 switch (e->expr_type)
576 len = expr_to_char (e, &data[0], &chk[0], length);
581 for (c = e->value.constructor; c; c = c->next)
583 size_t elt_size = gfc_target_expr_size (c->expr);
586 len = elt_size * (size_t)mpz_get_si (c->n.offset);
588 len = len + gfc_merge_initializers (ts, c->expr, &data[len],
589 &chk[len], length - len);