1 /* Translation of constants
2 Copyright (C) 2002-2015 Free Software Foundation, Inc.
3 Contributed by Paul Brook
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 3, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING3. If not see
19 <http://www.gnu.org/licenses/>. */
21 /* trans-const.c -- convert constant values */
25 #include "coretypes.h"
30 #include "fold-const.h"
31 #include "stor-layout.h"
33 #include "diagnostic-core.h" /* For fatal_error. */
35 #include "trans-const.h"
36 #include "trans-types.h"
37 #include "target-memory.h"
39 tree gfc_rank_cst[GFC_MAX_DIMENSIONS + 1];
41 /* Build a constant with given type from an int_cst. */
44 gfc_build_const (tree type, tree intval)
49 switch (TREE_CODE (type))
52 val = convert (type, intval);
56 val = build_real_from_int_cst (type, intval);
60 val = build_real_from_int_cst (TREE_TYPE (type), intval);
61 zero = build_real_from_int_cst (TREE_TYPE (type), integer_zero_node);
62 val = build_complex (type, val, zero);
71 /* Build a string constant with C char type. */
74 gfc_build_string_const (int length, const char *s)
79 str = build_string (length, s);
80 len = size_int (length);
82 build_array_type (gfc_character1_type_node,
83 build_range_type (gfc_charlen_type_node,
85 TYPE_STRING_FLAG (TREE_TYPE (str)) = 1;
90 /* Build a string constant with a type given by its kind; take care of
91 non-default character kinds. */
94 gfc_build_wide_string_const (int kind, int length, const gfc_char_t *string)
101 i = gfc_validate_kind (BT_CHARACTER, kind, false);
102 size = length * gfc_character_kinds[i].bit_size / 8;
104 s = XCNEWVAR (char, size);
105 gfc_encode_character (kind, length, string, (unsigned char *) s, size);
107 str = build_string (size, s);
110 len = size_int (length);
112 build_array_type (gfc_get_char_type (kind),
113 build_range_type (gfc_charlen_type_node,
114 size_one_node, len));
115 TYPE_STRING_FLAG (TREE_TYPE (str)) = 1;
120 /* Build a Fortran character constant from a zero-terminated string.
121 There a two version of this function, one that translates the string
122 and one that doesn't. */
124 gfc_build_cstring_const (const char *string)
126 return gfc_build_string_const (strlen (string) + 1, string);
130 gfc_build_localized_cstring_const (const char *msgid)
132 const char *localized = _(msgid);
133 return gfc_build_string_const (strlen (localized) + 1, localized);
137 /* Return a string constant with the given length. Used for static
138 initializers. The constant will be padded or truncated to match
142 gfc_conv_string_init (tree length, gfc_expr * expr)
150 gcc_assert (expr->expr_type == EXPR_CONSTANT);
151 gcc_assert (expr->ts.type == BT_CHARACTER);
152 gcc_assert (tree_fits_uhwi_p (length));
154 len = TREE_INT_CST_LOW (length);
155 slen = expr->value.character.length;
159 s = gfc_get_wide_string (len);
160 memcpy (s, expr->value.character.string, slen * sizeof (gfc_char_t));
161 gfc_wide_memset (&s[slen], ' ', len - slen);
165 s = expr->value.character.string;
167 str = gfc_build_wide_string_const (expr->ts.kind, len, s);
176 /* Create a tree node for the string length if it is constant. */
179 gfc_conv_const_charlen (gfc_charlen * cl)
181 if (!cl || cl->backend_decl)
184 if (cl->length && cl->length->expr_type == EXPR_CONSTANT)
186 cl->backend_decl = gfc_conv_mpz_to_tree (cl->length->value.integer,
187 cl->length->ts.kind);
188 cl->backend_decl = fold_convert (gfc_charlen_type_node,
194 gfc_init_constants (void)
198 for (n = 0; n <= GFC_MAX_DIMENSIONS; n++)
199 gfc_rank_cst[n] = build_int_cst (gfc_array_index_type, n);
202 /* Converts a GMP integer into a backend tree node. */
205 gfc_conv_mpz_to_tree (mpz_t i, int kind)
207 wide_int val = wi::from_mpz (gfc_get_int_type (kind), i, true);
208 return wide_int_to_tree (gfc_get_int_type (kind), val);
211 /* Converts a backend tree into a GMP integer. */
214 gfc_conv_tree_to_mpz (mpz_t i, tree source)
216 wi::to_mpz (source, i, TYPE_SIGN (TREE_TYPE (source)));
219 /* Converts a real constant into backend form. */
222 gfc_conv_mpfr_to_tree (mpfr_t f, int kind, int is_snan)
226 REAL_VALUE_TYPE real;
228 n = gfc_validate_kind (BT_REAL, kind, false);
229 gcc_assert (gfc_real_kinds[n].radix == 2);
231 type = gfc_get_real_type (kind);
232 if (mpfr_nan_p (f) && is_snan)
233 real_from_string (&real, "SNaN");
235 real_from_mpfr (&real, f, type, GFC_RND_MODE);
237 return build_real (type, real);
240 /* Returns a real constant that is +Infinity if the target
241 supports infinities for this floating-point mode, and
242 +HUGE_VAL otherwise (the largest representable number). */
245 gfc_build_inf_or_huge (tree type, int kind)
247 if (HONOR_INFINITIES (TYPE_MODE (type)))
249 REAL_VALUE_TYPE real;
251 return build_real (type, real);
255 int k = gfc_validate_kind (BT_REAL, kind, false);
256 return gfc_conv_mpfr_to_tree (gfc_real_kinds[k].huge, kind, 0);
260 /* Returns a floating-point NaN of a given type. */
263 gfc_build_nan (tree type, const char *str)
265 REAL_VALUE_TYPE real;
266 real_nan (&real, str, 1, TYPE_MODE (type));
267 return build_real (type, real);
270 /* Converts a backend tree into a real constant. */
273 gfc_conv_tree_to_mpfr (mpfr_ptr f, tree source)
275 mpfr_from_real (f, TREE_REAL_CST_PTR (source), GFC_RND_MODE);
278 /* Translate any literal constant to a tree. Constants never have
279 pre or post chains. Character literal constants are special
280 special because they have a value and a length, so they cannot be
281 returned as a single tree. It is up to the caller to set the
282 length somewhere if necessary.
284 Returns the translated constant, or aborts if it gets a type it
288 gfc_conv_constant_to_tree (gfc_expr * expr)
292 gcc_assert (expr->expr_type == EXPR_CONSTANT);
294 /* If it is has a prescribed memory representation, we build a string
295 constant and VIEW_CONVERT to its type. */
297 switch (expr->ts.type)
300 if (expr->representation.string)
301 return fold_build1_loc (input_location, VIEW_CONVERT_EXPR,
302 gfc_get_int_type (expr->ts.kind),
303 gfc_build_string_const (expr->representation.length,
304 expr->representation.string));
306 return gfc_conv_mpz_to_tree (expr->value.integer, expr->ts.kind);
309 if (expr->representation.string)
310 return fold_build1_loc (input_location, VIEW_CONVERT_EXPR,
311 gfc_get_real_type (expr->ts.kind),
312 gfc_build_string_const (expr->representation.length,
313 expr->representation.string));
315 return gfc_conv_mpfr_to_tree (expr->value.real, expr->ts.kind, expr->is_snan);
318 if (expr->representation.string)
320 tree tmp = fold_build1_loc (input_location, VIEW_CONVERT_EXPR,
321 gfc_get_int_type (expr->ts.kind),
322 gfc_build_string_const (expr->representation.length,
323 expr->representation.string));
324 if (!integer_zerop (tmp) && !integer_onep (tmp))
325 gfc_warning (0, "Assigning value other than 0 or 1 to LOGICAL"
326 " has undefined result at %L", &expr->where);
327 return fold_convert (gfc_get_logical_type (expr->ts.kind), tmp);
330 return build_int_cst (gfc_get_logical_type (expr->ts.kind),
331 expr->value.logical);
334 if (expr->representation.string)
335 return fold_build1_loc (input_location, VIEW_CONVERT_EXPR,
336 gfc_get_complex_type (expr->ts.kind),
337 gfc_build_string_const (expr->representation.length,
338 expr->representation.string));
341 tree real = gfc_conv_mpfr_to_tree (mpc_realref (expr->value.complex),
342 expr->ts.kind, expr->is_snan);
343 tree imag = gfc_conv_mpfr_to_tree (mpc_imagref (expr->value.complex),
344 expr->ts.kind, expr->is_snan);
346 return build_complex (gfc_typenode_for_spec (&expr->ts),
351 res = gfc_build_wide_string_const (expr->ts.kind,
352 expr->value.character.length,
353 expr->value.character.string);
357 return gfc_build_string_const (expr->representation.length,
358 expr->representation.string);
361 fatal_error (input_location,
362 "gfc_conv_constant_to_tree(): invalid type: %s",
363 gfc_typename (&expr->ts));
368 /* Like gfc_conv_constant_to_tree, but for a simplified expression.
369 We can handle character literal constants here as well. */
372 gfc_conv_constant (gfc_se * se, gfc_expr * expr)
376 /* We may be receiving an expression for C_NULL_PTR or C_NULL_FUNPTR. If
377 so, the expr_type will not yet be an EXPR_CONSTANT. We need to make
379 if (expr->ts.type == BT_DERIVED && expr->ts.u.derived
380 && expr->ts.u.derived->attr.is_iso_c)
382 if (expr->symtree->n.sym->intmod_sym_id == ISOCBINDING_NULL_PTR
383 || expr->symtree->n.sym->intmod_sym_id == ISOCBINDING_NULL_FUNPTR)
385 /* Create a new EXPR_CONSTANT expression for our local uses. */
386 expr = gfc_get_int_expr (gfc_default_integer_kind, NULL, 0);
390 if (expr->expr_type != EXPR_CONSTANT)
392 gfc_expr *e = gfc_get_int_expr (gfc_default_integer_kind, NULL, 0);
393 gfc_error ("non-constant initialization expression at %L", &expr->where);
394 se->expr = gfc_conv_constant_to_tree (e);
401 gfc_ss_info *ss_info;
404 gcc_assert (ss != gfc_ss_terminator);
405 gcc_assert (ss_info->type == GFC_SS_SCALAR);
406 gcc_assert (ss_info->expr == expr);
408 se->expr = ss_info->data.scalar.value;
409 se->string_length = ss_info->string_length;
410 gfc_advance_se_ss_chain (se);
414 /* Translate the constant and put it in the simplifier structure. */
415 se->expr = gfc_conv_constant_to_tree (expr);
417 /* If this is a CHARACTER string, set its length in the simplifier
419 if (expr->ts.type == BT_CHARACTER)
420 se->string_length = TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (se->expr)));