1 /* Generic helper function for repacking arrays.
2    Copyright (C) 2003-2013 Free Software Foundation, Inc.
3    Contributed by Paul Brook <paul@nowt.org>
4 
5 This file is part of the GNU Fortran runtime library (libgfortran).
6 
7 Libgfortran is free software; you can redistribute it and/or
8 modify it under the terms of the GNU General Public
9 License as published by the Free Software Foundation; either
10 version 3 of the License, or (at your option) any later version.
11 
12 Libgfortran is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15 GNU General Public License for more details.
16 
17 Under Section 7 of GPL version 3, you are granted additional
18 permissions described in the GCC Runtime Library Exception, version
19 3.1, as published by the Free Software Foundation.
20 
21 You should have received a copy of the GNU General Public License and
22 a copy of the GCC Runtime Library Exception along with this program;
23 see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
24 <http://www.gnu.org/licenses/>.  */
25 
26 #include "libgfortran.h"
27 #include <stdlib.h>
28 #include <assert.h>
29 #include <string.h>
30 
31 extern void internal_unpack (gfc_array_char *, const void *);
32 export_proto(internal_unpack);
33 
34 void
internal_unpack(gfc_array_char * d,const void * s)35 internal_unpack (gfc_array_char * d, const void * s)
36 {
37   index_type count[GFC_MAX_DIMENSIONS];
38   index_type extent[GFC_MAX_DIMENSIONS];
39   index_type stride[GFC_MAX_DIMENSIONS];
40   index_type stride0;
41   index_type dim;
42   index_type dsize;
43   char *dest;
44   const char *src;
45   int n;
46   int size;
47   int type_size;
48 
49   dest = d->base_addr;
50   /* This check may be redundant, but do it anyway.  */
51   if (s == dest || !s)
52     return;
53 
54   type_size = GFC_DTYPE_TYPE_SIZE (d);
55   switch (type_size)
56     {
57     case GFC_DTYPE_INTEGER_1:
58     case GFC_DTYPE_LOGICAL_1:
59     case GFC_DTYPE_DERIVED_1:
60       internal_unpack_1 ((gfc_array_i1 *) d, (const GFC_INTEGER_1 *) s);
61       return;
62 
63     case GFC_DTYPE_INTEGER_2:
64     case GFC_DTYPE_LOGICAL_2:
65       internal_unpack_2 ((gfc_array_i2 *) d, (const GFC_INTEGER_2 *) s);
66       return;
67 
68     case GFC_DTYPE_INTEGER_4:
69     case GFC_DTYPE_LOGICAL_4:
70       internal_unpack_4 ((gfc_array_i4 *) d, (const GFC_INTEGER_4 *) s);
71       return;
72 
73     case GFC_DTYPE_INTEGER_8:
74     case GFC_DTYPE_LOGICAL_8:
75       internal_unpack_8 ((gfc_array_i8 *) d, (const GFC_INTEGER_8 *) s);
76       return;
77 
78 #if defined (HAVE_GFC_INTEGER_16)
79     case GFC_DTYPE_INTEGER_16:
80     case GFC_DTYPE_LOGICAL_16:
81       internal_unpack_16 ((gfc_array_i16 *) d, (const GFC_INTEGER_16 *) s);
82       return;
83 #endif
84 
85     case GFC_DTYPE_REAL_4:
86       internal_unpack_r4 ((gfc_array_r4 *) d, (const GFC_REAL_4 *) s);
87       return;
88 
89     case GFC_DTYPE_REAL_8:
90       internal_unpack_r8 ((gfc_array_r8 *) d, (const GFC_REAL_8 *) s);
91       return;
92 
93 /* FIXME: This here is a hack, which will have to be removed when
94    the array descriptor is reworked.  Currently, we don't store the
95    kind value for the type, but only the size.  Because on targets with
96    __float128, we have sizeof(logn double) == sizeof(__float128),
97    we cannot discriminate here and have to fall back to the generic
98    handling (which is suboptimal).  */
99 #if !defined(GFC_REAL_16_IS_FLOAT128)
100 # if defined(HAVE_GFC_REAL_10)
101     case GFC_DTYPE_REAL_10:
102       internal_unpack_r10 ((gfc_array_r10 *) d, (const GFC_REAL_10 *) s);
103       return;
104 # endif
105 
106 # if defined(HAVE_GFC_REAL_16)
107     case GFC_DTYPE_REAL_16:
108       internal_unpack_r16 ((gfc_array_r16 *) d, (const GFC_REAL_16 *) s);
109       return;
110 # endif
111 #endif
112 
113     case GFC_DTYPE_COMPLEX_4:
114       internal_unpack_c4 ((gfc_array_c4 *)d, (const GFC_COMPLEX_4 *)s);
115       return;
116 
117     case GFC_DTYPE_COMPLEX_8:
118       internal_unpack_c8 ((gfc_array_c8 *)d, (const GFC_COMPLEX_8 *)s);
119       return;
120 
121 /* FIXME: This here is a hack, which will have to be removed when
122    the array descriptor is reworked.  Currently, we don't store the
123    kind value for the type, but only the size.  Because on targets with
124    __float128, we have sizeof(logn double) == sizeof(__float128),
125    we cannot discriminate here and have to fall back to the generic
126    handling (which is suboptimal).  */
127 #if !defined(GFC_REAL_16_IS_FLOAT128)
128 # if defined(HAVE_GFC_COMPLEX_10)
129     case GFC_DTYPE_COMPLEX_10:
130       internal_unpack_c10 ((gfc_array_c10 *) d, (const GFC_COMPLEX_10 *) s);
131       return;
132 # endif
133 
134 # if defined(HAVE_GFC_COMPLEX_16)
135     case GFC_DTYPE_COMPLEX_16:
136       internal_unpack_c16 ((gfc_array_c16 *) d, (const GFC_COMPLEX_16 *) s);
137       return;
138 # endif
139 #endif
140 
141     case GFC_DTYPE_DERIVED_2:
142       if (GFC_UNALIGNED_2(d->base_addr) || GFC_UNALIGNED_2(s))
143 	break;
144       else
145 	{
146 	  internal_unpack_2 ((gfc_array_i2 *) d, (const GFC_INTEGER_2 *) s);
147 	  return;
148 	}
149     case GFC_DTYPE_DERIVED_4:
150       if (GFC_UNALIGNED_4(d->base_addr) || GFC_UNALIGNED_4(s))
151 	break;
152       else
153 	{
154 	  internal_unpack_4 ((gfc_array_i4 *) d, (const GFC_INTEGER_4 *) s);
155 	  return;
156 	}
157 
158     case GFC_DTYPE_DERIVED_8:
159       if (GFC_UNALIGNED_8(d->base_addr) || GFC_UNALIGNED_8(s))
160 	break;
161       else
162 	{
163 	  internal_unpack_8 ((gfc_array_i8 *) d, (const GFC_INTEGER_8 *) s);
164 	  return;
165 	}
166 
167 #ifdef HAVE_GFC_INTEGER_16
168     case GFC_DTYPE_DERIVED_16:
169       if (GFC_UNALIGNED_16(d->base_addr) || GFC_UNALIGNED_16(s))
170 	break;
171       else
172 	{
173 	  internal_unpack_16 ((gfc_array_i16 *) d, (const GFC_INTEGER_16 *) s);
174 	  return;
175 	}
176 #endif
177 
178     default:
179       break;
180     }
181 
182   size = GFC_DESCRIPTOR_SIZE (d);
183 
184   dim = GFC_DESCRIPTOR_RANK (d);
185   dsize = 1;
186   for (n = 0; n < dim; n++)
187     {
188       count[n] = 0;
189       stride[n] = GFC_DESCRIPTOR_STRIDE(d,n);
190       extent[n] = GFC_DESCRIPTOR_EXTENT(d,n);
191       if (extent[n] <= 0)
192 	return;
193 
194       if (dsize == stride[n])
195 	dsize *= extent[n];
196       else
197 	dsize = 0;
198     }
199 
200   src = s;
201 
202   if (dsize != 0)
203     {
204       memcpy (dest, src, dsize * size);
205       return;
206     }
207 
208   stride0 = stride[0] * size;
209 
210   while (dest)
211     {
212       /* Copy the data.  */
213       memcpy (dest, src, size);
214       /* Advance to the next element.  */
215       src += size;
216       dest += stride0;
217       count[0]++;
218       /* Advance to the next source element.  */
219       n = 0;
220       while (count[n] == extent[n])
221         {
222           /* When we get to the end of a dimension, reset it and increment
223              the next dimension.  */
224           count[n] = 0;
225           /* We could precalculate these products, but this is a less
226              frequently used path so probably not worth it.  */
227           dest -= stride[n] * extent[n] * size;
228           n++;
229           if (n == dim)
230             {
231               dest = NULL;
232               break;
233             }
234           else
235             {
236               count[n]++;
237               dest += stride[n] * size;
238             }
239         }
240     }
241 }
242