1 /* Translation of constants
2 Copyright (C) 2002, 2003, 2004 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 2, 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 COPYING. If not, write to the Free
19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
22 /* trans-const.c -- convert constant values */
26 #include "coretypes.h"
37 #include "trans-const.h"
38 #include "trans-types.h"
40 /* String constants. */
41 tree gfc_strconst_bounds;
42 tree gfc_strconst_fault;
43 tree gfc_strconst_wrong_return;
44 tree gfc_strconst_current_filename;
46 tree gfc_rank_cst[GFC_MAX_DIMENSIONS + 1];
48 /* Build a constant with given type from an int_cst. */
50 gfc_build_const (tree type, tree intval)
55 switch (TREE_CODE (type))
58 val = convert (type, intval);
62 val = build_real_from_int_cst (type, intval);
66 val = build_real_from_int_cst (TREE_TYPE (type), intval);
67 zero = build_real_from_int_cst (TREE_TYPE (type), integer_zero_node);
68 val = build_complex (type, val, zero);
78 gfc_build_string_const (int length, const char *s)
83 str = build_string (length, s);
84 len = build_int_cst (NULL_TREE, length, 0);
86 build_array_type (gfc_character1_type_node,
87 build_range_type (gfc_strlen_type_node,
88 integer_one_node, len));
92 /* Return a string constant with the given length. Used for static
93 initializers. The constant will be padded or truncated to match
97 gfc_conv_string_init (tree length, gfc_expr * expr)
104 assert (expr->expr_type == EXPR_CONSTANT);
105 assert (expr->ts.type == BT_CHARACTER && expr->ts.kind == 1);
106 assert (INTEGER_CST_P (length));
107 assert (TREE_INT_CST_HIGH (length) == 0);
109 len = TREE_INT_CST_LOW (length);
110 slen = expr->value.character.length;
114 s = gfc_getmem (len);
115 memcpy (s, expr->value.character.string, slen);
116 memset (&s[slen], ' ', len - slen);
117 str = gfc_build_string_const (len, s);
121 str = gfc_build_string_const (len, expr->value.character.string);
127 /* Create a tree node for the string length if it is constant. */
130 gfc_conv_const_charlen (gfc_charlen * cl)
132 if (cl->backend_decl)
135 if (cl->length && cl->length->expr_type == EXPR_CONSTANT)
137 cl->backend_decl = gfc_conv_mpz_to_tree (cl->length->value.integer,
138 cl->length->ts.kind);
143 gfc_init_constants (void)
147 for (n = 0; n <= GFC_MAX_DIMENSIONS; n++)
148 gfc_rank_cst[n] = build_int_cst (gfc_array_index_type, n, 0);
150 gfc_strconst_bounds = gfc_build_string_const (21, "Array bound mismatch");
153 gfc_build_string_const (30, "Array reference out of bounds");
155 gfc_strconst_wrong_return =
156 gfc_build_string_const (32, "Incorrect function return value");
158 gfc_strconst_current_filename =
159 gfc_build_string_const (strlen (gfc_option.source) + 1,
163 #define BITS_PER_HOST_WIDE_INT (8 * sizeof (HOST_WIDE_INT))
164 /* Converts a GMP integer into a backend tree node. */
166 gfc_conv_mpz_to_tree (mpz_t i, int kind)
171 unsigned HOST_WIDE_INT low;
178 /* TODO: could be wrong if sizeof(HOST_WIDE_INT) |= SIZEOF (int). */
179 if (mpz_fits_slong_p (i))
181 val = mpz_get_si (i);
182 res = build_int_cst (gfc_get_int_type (kind),
183 val, (val < 0) ? (HOST_WIDE_INT)-1 : 0);
187 n = mpz_sizeinbase (i, 16);
189 q = gfc_getmem (n + 2);
195 p = mpz_get_str (q, 16, i);
207 if (n >= '0' && n <= '9')
209 else if (n >= 'a' && n <= 'z')
211 else if (n >= 'A' && n <= 'Z')
216 assert (n >= 0 && n < 16);
217 high = (high << 4) + (low >> (BITS_PER_HOST_WIDE_INT - 4));
218 low = (low << 4) + n;
220 res = build_int_cst (gfc_get_int_type (kind), low, high);
222 res = fold (build1 (NEGATE_EXPR, TREE_TYPE (res), res));
230 /* Converts a real constant into backend form. Uses an intermediate string
233 gfc_conv_mpfr_to_tree (mpfr_t f, int kind)
243 for (n = 0; gfc_real_kinds[n].kind != 0; n++)
245 if (gfc_real_kinds[n].kind == kind)
248 assert (gfc_real_kinds[n].kind);
250 n = MAX (abs (gfc_real_kinds[n].min_exponent),
251 abs (gfc_real_kinds[n].max_exponent));
260 if (kind == gfc_default_double_kind())
261 p = mpfr_get_str (NULL, &exp, 10, 17, f, GFC_RND_MODE);
263 p = mpfr_get_str (NULL, &exp, 10, 8, f, GFC_RND_MODE);
266 /* We also have one minus sign, "e", "." and a null terminator. */
267 q = (char *) gfc_getmem (strlen (p) + edigits + 4);
273 strcpy (&q[2], &p[1]);
283 sprintf (&q[strlen (q)], "%d", (int) exp);
290 type = gfc_get_real_type (kind);
291 res = build_real (type, REAL_VALUE_ATOF (q, TYPE_MODE (type)));
300 /* Translate any literal constant to a tree. Constants never have
301 pre or post chains. Character literal constants are special
302 special because they have a value and a length, so they cannot be
303 returned as a single tree. It is up to the caller to set the
304 length somewhere if necessary.
306 Returns the translated constant, or aborts if it gets a type it
310 gfc_conv_constant_to_tree (gfc_expr * expr)
312 assert (expr->expr_type == EXPR_CONSTANT);
314 switch (expr->ts.type)
317 return gfc_conv_mpz_to_tree (expr->value.integer, expr->ts.kind);
320 return gfc_conv_mpfr_to_tree (expr->value.real, expr->ts.kind);
323 return build_int_cst (NULL_TREE, expr->value.logical, 0);
327 tree real = gfc_conv_mpfr_to_tree (expr->value.complex.r,
329 tree imag = gfc_conv_mpfr_to_tree (expr->value.complex.i,
332 return build_complex (NULL_TREE, real, imag);
336 return gfc_build_string_const (expr->value.character.length,
337 expr->value.character.string);
340 fatal_error ("gfc_conv_constant_to_tree(): invalid type: %s",
341 gfc_typename (&expr->ts));
346 /* Like gfc_conv_contrant_to_tree, but for a simplified expression.
347 We can handle character literal constants here as well. */
350 gfc_conv_constant (gfc_se * se, gfc_expr * expr)
352 assert (expr->expr_type == EXPR_CONSTANT);
356 assert (se->ss != gfc_ss_terminator);
357 assert (se->ss->type == GFC_SS_SCALAR);
358 assert (se->ss->expr == expr);
360 se->expr = se->ss->data.scalar.expr;
361 se->string_length = se->ss->data.scalar.string_length;
362 gfc_advance_se_ss_chain (se);
366 /* Translate the constant and put it in the simplifier structure. */
367 se->expr = gfc_conv_constant_to_tree (expr);
369 /* If this is a CHARACTER string, set it's length in the simplifier
371 if (expr->ts.type == BT_CHARACTER)
372 se->string_length = TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (se->expr)));