1 /****************************************************************************
3 * GNAT COMPILER COMPONENTS *
9 * Copyright (C) 1992-2012, Free Software Foundation, Inc. *
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 3, 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 COPYING3. If not see *
19 * <http://www.gnu.org/licenses/>. *
21 * GNAT was originally developed by the GNAT team at New York University. *
22 * Extensive contributions were provided by Ada Core Technologies Inc. *
24 ****************************************************************************/
26 /* Functions for retrieving target types. See Ada package Get_Targ */
30 #include "coretypes.h"
51 /* If we don't have a specific size for Ada's equivalent of `long', use that
53 #ifndef ADA_LONG_TYPE_SIZE
54 #define ADA_LONG_TYPE_SIZE LONG_TYPE_SIZE
57 /* If we don't have a target definition of WIDEST_HARDWARE_FP_SIZE, assume
58 DOUBLE_TYPE_SIZE. We used to default to LONG_DOUBLE_TYPE_SIZE, which now
59 most often maps 128 bits implemented with very inefficient software
60 emulations so is incorrect as a hardware size estimate. */
62 #ifndef WIDEST_HARDWARE_FP_SIZE
63 #define WIDEST_HARDWARE_FP_SIZE DOUBLE_TYPE_SIZE
66 /* The following provide a functional interface for the front end Ada code
67 to determine the sizes that are used for various C types. */
70 get_target_bits_per_unit (void)
76 get_target_bits_per_word (void)
82 get_target_char_size (void)
84 return CHAR_TYPE_SIZE;
88 get_target_wchar_t_size (void)
90 /* We never want wide characters less than "short" in Ada. */
91 return MAX (SHORT_TYPE_SIZE, WCHAR_TYPE_SIZE);
95 get_target_short_size (void)
97 return SHORT_TYPE_SIZE;
101 get_target_int_size (void)
103 return INT_TYPE_SIZE;
107 get_target_long_size (void)
109 return ADA_LONG_TYPE_SIZE;
113 get_target_long_long_size (void)
115 return LONG_LONG_TYPE_SIZE;
119 get_target_float_size (void)
121 return fp_prec_to_size (FLOAT_TYPE_SIZE);
125 get_target_double_size (void)
127 return fp_prec_to_size (DOUBLE_TYPE_SIZE);
131 get_target_long_double_size (void)
133 return fp_prec_to_size (WIDEST_HARDWARE_FP_SIZE);
137 get_target_pointer_size (void)
142 /* Alignment related values, mapped to attributes for functional and
143 documentation purposes. */
145 /* Standard'Maximum_Default_Alignment. Maximum alignment that the compiler
146 might choose by default for a type or object.
148 Stricter alignment requests trigger gigi's aligning_type circuitry for
149 stack objects or objects allocated by the default allocator. */
152 get_target_maximum_default_alignment (void)
154 return BIGGEST_ALIGNMENT / BITS_PER_UNIT;
157 /* Standard'System_Allocator_Alignment. Alignment guaranteed to be honored
158 by the default allocator (System.Memory.Alloc or malloc if we have no
159 run-time library at hand).
161 Stricter alignment requests trigger gigi's aligning_type circuitry for
162 objects allocated by the default allocator. */
164 /* ??? Need a way to get info about __gnat_malloc from here (whether it is
165 handy and what alignment it honors). In the meantime, resort to malloc
166 considerations only. */
168 /* Account for MALLOC_OBSERVABLE_ALIGNMENTs here. Use this or the ABI
169 guaranteed alignment if greater. */
171 #ifdef MALLOC_OBSERVABLE_ALIGNMENT
172 #define MALLOC_ALIGNMENT MALLOC_OBSERVABLE_ALIGNMENT
174 #define MALLOC_OBSERVABLE_ALIGNMENT (2 * LONG_TYPE_SIZE)
175 #define MALLOC_ALIGNMENT \
176 MAX (MALLOC_ABI_ALIGNMENT, MALLOC_OBSERVABLE_ALIGNMENT)
180 get_target_system_allocator_alignment (void)
182 return MALLOC_ALIGNMENT / BITS_PER_UNIT;
185 /* Standard'Maximum_Allowed_Alignment. Maximum alignment that we may
186 accept for any type or object. */
188 #ifndef MAX_OFILE_ALIGNMENT
189 #define MAX_OFILE_ALIGNMENT BIGGEST_ALIGNMENT
193 get_target_maximum_allowed_alignment (void)
195 return MAX_OFILE_ALIGNMENT / BITS_PER_UNIT;
198 /* Standard'Maximum_Alignment. The single attribute initially made
199 available, now a synonym of Standard'Maximum_Default_Alignment. */
202 get_target_maximum_alignment (void)
204 return get_target_maximum_default_alignment ();
207 #ifndef FLOAT_WORDS_BIG_ENDIAN
208 #define FLOAT_WORDS_BIG_ENDIAN WORDS_BIG_ENDIAN
212 get_float_words_be (void)
214 return FLOAT_WORDS_BIG_ENDIAN;
220 return WORDS_BIG_ENDIAN;
226 return BYTES_BIG_ENDIAN;
232 return BITS_BIG_ENDIAN;
236 get_target_strict_alignment (void)
238 return STRICT_ALIGNMENT;
242 get_target_double_float_alignment (void)
244 #ifdef TARGET_ALIGN_NATURAL
245 /* This macro is only defined by the rs6000 port. */
246 if (!TARGET_ALIGN_NATURAL
247 && (DEFAULT_ABI == ABI_AIX || DEFAULT_ABI == ABI_DARWIN))
248 return 32 / BITS_PER_UNIT;
254 get_target_double_scalar_alignment (void)
256 #ifdef TARGET_ALIGN_DOUBLE
257 /* This macro is only defined by the i386 and sh ports. */
258 if (!TARGET_ALIGN_DOUBLE
263 return 32 / BITS_PER_UNIT;