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[/] [openrisc/] [trunk/] [gnu-stable/] [gcc-4.5.1/] [gcc/] [fortran/] [trans-const.c] - Blame information for rev 856

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1 285 jeremybenn
/* Translation of constants
2
   Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008 Free Software
3
   Foundation, Inc.
4
   Contributed by Paul Brook
5
 
6
This file is part of GCC.
7
 
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
11
version.
12
 
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
16
for more details.
17
 
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/>.  */
21
 
22
/* trans-const.c -- convert constant values */
23
 
24
#include "config.h"
25
#include "system.h"
26
#include "coretypes.h"
27
#include "tree.h"
28
#include "ggc.h"
29
#include "toplev.h"
30
#include "real.h"
31
#include "double-int.h"
32
#include "gfortran.h"
33
#include "trans.h"
34
#include "trans-const.h"
35
#include "trans-types.h"
36
#include "target-memory.h"
37
 
38
tree gfc_rank_cst[GFC_MAX_DIMENSIONS + 1];
39
 
40
/* Build a constant with given type from an int_cst.  */
41
 
42
tree
43
gfc_build_const (tree type, tree intval)
44
{
45
  tree val;
46
  tree zero;
47
 
48
  switch (TREE_CODE (type))
49
    {
50
    case INTEGER_TYPE:
51
      val = convert (type, intval);
52
      break;
53
 
54
    case REAL_TYPE:
55
      val = build_real_from_int_cst (type, intval);
56
      break;
57
 
58
    case COMPLEX_TYPE:
59
      val = build_real_from_int_cst (TREE_TYPE (type), intval);
60
      zero = build_real_from_int_cst (TREE_TYPE (type), integer_zero_node);
61
      val = build_complex (type, val, zero);
62
      break;
63
 
64
    default:
65
      gcc_unreachable ();
66
    }
67
  return val;
68
}
69
 
70
/* Build a string constant with C char type.  */
71
 
72
tree
73
gfc_build_string_const (int length, const char *s)
74
{
75
  tree str;
76
  tree len;
77
 
78
  str = build_string (length, s);
79
  len = build_int_cst (NULL_TREE, length);
80
  TREE_TYPE (str) =
81
    build_array_type (gfc_character1_type_node,
82
                      build_range_type (gfc_charlen_type_node,
83
                                        integer_one_node, len));
84
  return str;
85
}
86
 
87
 
88
/* Build a string constant with a type given by its kind; take care of
89
   non-default character kinds.  */
90
 
91
tree
92
gfc_build_wide_string_const (int kind, int length, const gfc_char_t *string)
93
{
94
  int i;
95
  tree str, len;
96
  size_t size;
97
  char *s;
98
 
99
  i = gfc_validate_kind (BT_CHARACTER, kind, false);
100
  size = length * gfc_character_kinds[i].bit_size / 8;
101
 
102
  s = XCNEWVAR (char, size);
103
  gfc_encode_character (kind, length, string, (unsigned char *) s, size);
104
 
105
  str = build_string (size, s);
106
  gfc_free (s);
107
 
108
  len = build_int_cst (NULL_TREE, length);
109
  TREE_TYPE (str) =
110
    build_array_type (gfc_get_char_type (kind),
111
                      build_range_type (gfc_charlen_type_node,
112
                                        integer_one_node, len));
113
  return str;
114
}
115
 
116
 
117
/* Build a Fortran character constant from a zero-terminated string.
118
   There a two version of this function, one that translates the string
119
   and one that doesn't.  */
120
tree
121
gfc_build_cstring_const (const char *string)
122
{
123
  return gfc_build_string_const (strlen (string) + 1, string);
124
}
125
 
126
tree
127
gfc_build_localized_cstring_const (const char *msgid)
128
{
129
  const char *localized = _(msgid);
130
  return gfc_build_string_const (strlen (localized) + 1, localized);
131
}
132
 
133
 
134
/* Return a string constant with the given length.  Used for static
135
   initializers.  The constant will be padded or truncated to match
136
   length.  */
137
 
138
tree
139
gfc_conv_string_init (tree length, gfc_expr * expr)
140
{
141
  gfc_char_t *s;
142
  HOST_WIDE_INT len;
143
  int slen;
144
  tree str;
145
  bool free_s = false;
146
 
147
  gcc_assert (expr->expr_type == EXPR_CONSTANT);
148
  gcc_assert (expr->ts.type == BT_CHARACTER);
149
  gcc_assert (INTEGER_CST_P (length));
150
  gcc_assert (TREE_INT_CST_HIGH (length) == 0);
151
 
152
  len = TREE_INT_CST_LOW (length);
153
  slen = expr->value.character.length;
154
 
155
  if (len > slen)
156
    {
157
      s = gfc_get_wide_string (len);
158
      memcpy (s, expr->value.character.string, slen * sizeof (gfc_char_t));
159
      gfc_wide_memset (&s[slen], ' ', len - slen);
160
      free_s = true;
161
    }
162
  else
163
    s = expr->value.character.string;
164
 
165
  str = gfc_build_wide_string_const (expr->ts.kind, len, s);
166
 
167
  if (free_s)
168
    gfc_free (s);
169
 
170
  return str;
171
}
172
 
173
 
174
/* Create a tree node for the string length if it is constant.  */
175
 
176
void
177
gfc_conv_const_charlen (gfc_charlen * cl)
178
{
179
  if (!cl || cl->backend_decl)
180
    return;
181
 
182
  if (cl->length && cl->length->expr_type == EXPR_CONSTANT)
183
    {
184
      cl->backend_decl = gfc_conv_mpz_to_tree (cl->length->value.integer,
185
                                               cl->length->ts.kind);
186
      cl->backend_decl = fold_convert (gfc_charlen_type_node,
187
                                        cl->backend_decl);
188
    }
189
}
190
 
191
void
192
gfc_init_constants (void)
193
{
194
  int n;
195
 
196
  for (n = 0; n <= GFC_MAX_DIMENSIONS; n++)
197
    gfc_rank_cst[n] = build_int_cst (gfc_array_index_type, n);
198
}
199
 
200
/* Converts a GMP integer into a backend tree node.  */
201
 
202
tree
203
gfc_conv_mpz_to_tree (mpz_t i, int kind)
204
{
205
  double_int val = mpz_get_double_int (gfc_get_int_type (kind), i, true);
206
  return double_int_to_tree (gfc_get_int_type (kind), val);
207
}
208
 
209
/* Converts a backend tree into a GMP integer.  */
210
 
211
void
212
gfc_conv_tree_to_mpz (mpz_t i, tree source)
213
{
214
  double_int val = tree_to_double_int (source);
215
  mpz_set_double_int (i, val, TYPE_UNSIGNED (TREE_TYPE (source)));
216
}
217
 
218
/* Converts a real constant into backend form.  */
219
 
220
tree
221
gfc_conv_mpfr_to_tree (mpfr_t f, int kind, int is_snan)
222
{
223
  tree type;
224
  int n;
225
  REAL_VALUE_TYPE real;
226
 
227
  n = gfc_validate_kind (BT_REAL, kind, false);
228
  gcc_assert (gfc_real_kinds[n].radix == 2);
229
 
230
  type = gfc_get_real_type (kind);
231
  if (mpfr_nan_p (f) && is_snan)
232
     real_from_string (&real, "SNaN");
233
  else
234
    real_from_mpfr (&real, f, type, GFC_RND_MODE);
235
 
236
  return build_real (type, real);
237
}
238
 
239
/* Converts a backend tree into a real constant.  */
240
 
241
void
242
gfc_conv_tree_to_mpfr (mpfr_ptr f, tree source)
243
{
244
  mpfr_from_real (f, TREE_REAL_CST_PTR (source), GFC_RND_MODE);
245
}
246
 
247
/* Translate any literal constant to a tree.  Constants never have
248
   pre or post chains.  Character literal constants are special
249
   special because they have a value and a length, so they cannot be
250
   returned as a single tree.  It is up to the caller to set the
251
   length somewhere if necessary.
252
 
253
   Returns the translated constant, or aborts if it gets a type it
254
   can't handle.  */
255
 
256
tree
257
gfc_conv_constant_to_tree (gfc_expr * expr)
258
{
259
  tree res;
260
 
261
  gcc_assert (expr->expr_type == EXPR_CONSTANT);
262
 
263
  /* If it is has a prescribed memory representation, we build a string
264
     constant and VIEW_CONVERT to its type.  */
265
 
266
  switch (expr->ts.type)
267
    {
268
    case BT_INTEGER:
269
      if (expr->representation.string)
270
        return fold_build1 (VIEW_CONVERT_EXPR,
271
                            gfc_get_int_type (expr->ts.kind),
272
                            gfc_build_string_const (expr->representation.length,
273
                                                    expr->representation.string));
274
      else
275
        return gfc_conv_mpz_to_tree (expr->value.integer, expr->ts.kind);
276
 
277
    case BT_REAL:
278
      if (expr->representation.string)
279
        return fold_build1 (VIEW_CONVERT_EXPR,
280
                            gfc_get_real_type (expr->ts.kind),
281
                            gfc_build_string_const (expr->representation.length,
282
                                                    expr->representation.string));
283
      else
284
        return gfc_conv_mpfr_to_tree (expr->value.real, expr->ts.kind, expr->is_snan);
285
 
286
    case BT_LOGICAL:
287
      if (expr->representation.string)
288
        {
289
          tree tmp = fold_build1 (VIEW_CONVERT_EXPR,
290
                                  gfc_get_int_type (expr->ts.kind),
291
                                  gfc_build_string_const (expr->representation.length,
292
                                                          expr->representation.string));
293
          if (!integer_zerop (tmp) && !integer_onep (tmp))
294
            gfc_warning ("Assigning value other than 0 or 1 to LOGICAL"
295
                         " has undefined result at %L", &expr->where);
296
          return fold_convert (gfc_get_logical_type (expr->ts.kind), tmp);
297
        }
298
      else
299
        return build_int_cst (gfc_get_logical_type (expr->ts.kind),
300
                              expr->value.logical);
301
 
302
    case BT_COMPLEX:
303
      if (expr->representation.string)
304
        return fold_build1 (VIEW_CONVERT_EXPR,
305
                            gfc_get_complex_type (expr->ts.kind),
306
                            gfc_build_string_const (expr->representation.length,
307
                                                    expr->representation.string));
308
      else
309
        {
310
          tree real = gfc_conv_mpfr_to_tree (mpc_realref (expr->value.complex),
311
                                          expr->ts.kind, expr->is_snan);
312
          tree imag = gfc_conv_mpfr_to_tree (mpc_imagref (expr->value.complex),
313
                                          expr->ts.kind, expr->is_snan);
314
 
315
          return build_complex (gfc_typenode_for_spec (&expr->ts),
316
                                real, imag);
317
        }
318
 
319
    case BT_CHARACTER:
320
      res = gfc_build_wide_string_const (expr->ts.kind,
321
                                         expr->value.character.length,
322
                                         expr->value.character.string);
323
      return res;
324
 
325
    case BT_HOLLERITH:
326
      return gfc_build_string_const (expr->representation.length,
327
                                     expr->representation.string);
328
 
329
    default:
330
      fatal_error ("gfc_conv_constant_to_tree(): invalid type: %s",
331
                   gfc_typename (&expr->ts));
332
    }
333
}
334
 
335
 
336
/* Like gfc_conv_constant_to_tree, but for a simplified expression.
337
   We can handle character literal constants here as well.  */
338
 
339
void
340
gfc_conv_constant (gfc_se * se, gfc_expr * expr)
341
{
342
  /* We may be receiving an expression for C_NULL_PTR or C_NULL_FUNPTR.  If
343
     so, the expr_type will not yet be an EXPR_CONSTANT.  We need to make
344
     it so here.  */
345
  if (expr->ts.type == BT_DERIVED && expr->ts.u.derived
346
      && expr->ts.u.derived->attr.is_iso_c)
347
    {
348
      if (expr->symtree->n.sym->intmod_sym_id == ISOCBINDING_NULL_PTR
349
          || expr->symtree->n.sym->intmod_sym_id == ISOCBINDING_NULL_FUNPTR)
350
        {
351
          /* Create a new EXPR_CONSTANT expression for our local uses.  */
352
          expr = gfc_int_expr (0);
353
        }
354
    }
355
 
356
  if (expr->expr_type != EXPR_CONSTANT)
357
    {
358
      gfc_error ("non-constant initialization expression at %L", &expr->where);
359
      se->expr = gfc_conv_constant_to_tree (gfc_int_expr (0));
360
      return;
361
    }
362
 
363
  if (se->ss != NULL)
364
    {
365
      gcc_assert (se->ss != gfc_ss_terminator);
366
      gcc_assert (se->ss->type == GFC_SS_SCALAR);
367
      gcc_assert (se->ss->expr == expr);
368
 
369
      se->expr = se->ss->data.scalar.expr;
370
      se->string_length = se->ss->string_length;
371
      gfc_advance_se_ss_chain (se);
372
      return;
373
    }
374
 
375
  /* Translate the constant and put it in the simplifier structure.  */
376
  se->expr = gfc_conv_constant_to_tree (expr);
377
 
378
  /* If this is a CHARACTER string, set its length in the simplifier
379
     structure, too.  */
380
  if (expr->ts.type == BT_CHARACTER)
381
    se->string_length = TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (se->expr)));
382
}

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