gcc/ada/targtyps.c

   1 /****************************************************************************
   2  *                                                                          *
   3  *                         GNAT COMPILER COMPONENTS                         *
   4  *                                                                          *
   5  *                            T A R G T Y P S                               *
   6  *                                                                          *
   7  *                                  Body                                    *
   8  *                                                                          *
   9  *          Copyright (C) 1992-2007, Free Software Foundation, Inc.         *
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  11  * GNAT is free software;  you can  redistribute it  and/or modify it under *
  12  * terms of the  GNU General Public License as published  by the Free Soft- *
  13  * ware  Foundation;  either version 2,  or (at your option) any later ver- *
  14  * sion.  GNAT is distributed in the hope that it will be useful, but WITH- *
  15  * OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY *
  16  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License *
  17  * for  more details.  You should have  received  a copy of the GNU General *
  18  * Public License  distributed with GNAT;  see file COPYING.  If not, write *
  19  * to  the  Free Software Foundation,  51  Franklin  Street,  Fifth  Floor, *
  20  * Boston, MA 02110-1301, USA.                                              *
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  22  * As a  special  exception,  if you  link  this file  with other  files to *
  23  * produce an executable,  this file does not by itself cause the resulting *
  24  * executable to be covered by the GNU General Public License. This except- *
  25  * ion does not  however invalidate  any other reasons  why the  executable *
  26  * file might be covered by the  GNU Public License.                        *
  27  *                                                                          *
  28  * GNAT was originally developed  by the GNAT team at  New York University. *
  29  * Extensive contributions were provided by Ada Core Technologies Inc.      *
  30  *                                                                          *
  31  ****************************************************************************/
  32
  33 /* Functions for retrieving target types. See Ada package Get_Targ */
  34
  35 #include "config.h"
  36 #include "system.h"
  37 #include "coretypes.h"
  38 #include "tm.h"
  39 #include "tree.h"
  40 #include "real.h"
  41 #include "rtl.h"
  42 #include "ada.h"
  43 #include "types.h"
  44 #include "atree.h"
  45 #include "elists.h"
  46 #include "namet.h"
  47 #include "nlists.h"
  48 #include "snames.h"
  49 #include "stringt.h"
  50 #include "uintp.h"
  51 #include "urealp.h"
  52 #include "fe.h"
  53 #include "sinfo.h"
  54 #include "einfo.h"
  55 #include "ada-tree.h"
  56 #include "gigi.h"
  57
  58 /* If we don't have a specific size for Ada's equivalent of `long', use that
  59    of C.  */
  60 #ifndef ADA_LONG_TYPE_SIZE
  61 #define ADA_LONG_TYPE_SIZE LONG_TYPE_SIZE
  62 #endif
  63
  64 #ifndef WIDEST_HARDWARE_FP_SIZE
  65 #define WIDEST_HARDWARE_FP_SIZE LONG_DOUBLE_TYPE_SIZE
  66 #endif
  67
  68 /* The following provide a functional interface for the front end Ada code
  69    to determine the sizes that are used for various C types. */
  70
  71 Pos
  72 get_target_bits_per_unit (void)
  73 {
  74   return BITS_PER_UNIT;
  75 }
  76
  77 Pos
  78 get_target_bits_per_word (void)
  79 {
  80   return BITS_PER_WORD;
  81 }
  82
  83 Pos
  84 get_target_char_size (void)
  85 {
  86   return CHAR_TYPE_SIZE;
  87 }
  88
  89 Pos
  90 get_target_wchar_t_size (void)
  91 {
  92   /* We never want wide characters less than "short" in Ada.  */
  93   return MAX (SHORT_TYPE_SIZE, WCHAR_TYPE_SIZE);
  94 }
  95
  96 Pos
  97 get_target_short_size (void)
  98 {
  99   return SHORT_TYPE_SIZE;
 100 }
 101
 102 Pos
 103 get_target_int_size (void)
 104 {
 105   return INT_TYPE_SIZE;
 106 }
 107
 108 Pos
 109 get_target_long_size (void)
 110 {
 111   return ADA_LONG_TYPE_SIZE;
 112 }
 113
 114 Pos
 115 get_target_long_long_size (void)
 116 {
 117   return LONG_LONG_TYPE_SIZE;
 118 }
 119
 120 Pos
 121 get_target_float_size (void)
 122 {
 123   return fp_prec_to_size (FLOAT_TYPE_SIZE);
 124 }
 125
 126 Pos
 127 get_target_double_size (void)
 128 {
 129   return fp_prec_to_size (DOUBLE_TYPE_SIZE);
 130 }
 131
 132 Pos
 133 get_target_long_double_size (void)
 134 {
 135   return fp_prec_to_size (WIDEST_HARDWARE_FP_SIZE);
 136 }
 137
 138
 139 Pos
 140 get_target_pointer_size (void)
 141 {
 142   return POINTER_SIZE;
 143 }
 144
 145 /* Alignment related values, mapped to attributes for functional and
 146    documentation purposes.  */
 147
 148 /* Standard'Maximum_Default_Alignment.  Maximum alignment that the compiler
 149    might choose by default for a type or object.
 150
 151    Stricter alignment requests trigger gigi's aligning_type circuitry for
 152    stack objects or objects allocated by the default allocator.  */
 153
 154 Pos
 155 get_target_maximum_default_alignment (void)
 156 {
 157   return BIGGEST_ALIGNMENT / BITS_PER_UNIT;
 158 }
 159
 160 /* Standard'Default_Allocator_Alignment.  Alignment guaranteed to be honored
 161    by the default allocator (System.Memory.Alloc or malloc if we have no
 162    run-time library at hand).
 163
 164    Stricter alignment requests trigger gigi's aligning_type circuitry for
 165    objects allocated by the default allocator.  */
 166
 167 #ifndef MALLOC_ALIGNMENT
 168 #define MALLOC_ALIGNMENT BIGGEST_ALIGNMENT
 169 #endif
 170
 171 Pos
 172 get_target_default_allocator_alignment (void)
 173 {
 174   /* ??? Need a way to get info about __gnat_malloc from here (whether
 175      it is handy and what alignment it honors).  */
 176
 177   return MALLOC_ALIGNMENT / BITS_PER_UNIT;
 178 }
 179
 180 /* Standard'Maximum_Allowed_Alignment.  Maximum alignment that we may
 181    accept for any type or object.  */
 182
 183 #ifndef MAX_OFILE_ALIGNMENT
 184 #define MAX_OFILE_ALIGNMENT BIGGEST_ALIGNMENT
 185 #endif
 186
 187 Pos
 188 get_target_maximum_allowed_alignment (void)
 189 {
 190   return MAX_OFILE_ALIGNMENT / BITS_PER_UNIT;
 191 }
 192
 193 /* Standard'Maximum_Alignment.  The single attribute initially made
 194    available, now a synonym of Standard'Maximum_Default_Alignment.  */
 195
 196 Pos
 197 get_target_maximum_alignment (void)
 198 {
 199   return get_target_maximum_default_alignment ();
 200 }
 201
 202 #ifndef FLOAT_WORDS_BIG_ENDIAN
 203 #define FLOAT_WORDS_BIG_ENDIAN WORDS_BIG_ENDIAN
 204 #endif
 205
 206 Nat
 207 get_float_words_be (void)
 208 {
 209   return FLOAT_WORDS_BIG_ENDIAN;
 210 }
 211
 212 Nat
 213 get_words_be (void)
 214 {
 215   return WORDS_BIG_ENDIAN;
 216 }
 217
 218 Nat
 219 get_bytes_be (void)
 220 {
 221   return BYTES_BIG_ENDIAN;
 222 }
 223
 224 Nat
 225 get_bits_be (void)
 226 {
 227   return BITS_BIG_ENDIAN;
 228 }
 229
 230 Nat
 231 get_strict_alignment (void)
 232 {
 233   return STRICT_ALIGNMENT;
 234 }