1 /****************************************************************************
3 * GNAT COMPILER COMPONENTS *
9 * Copyright (C) 1992-2011, 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 #ifndef WIDEST_HARDWARE_FP_SIZE
58 #define WIDEST_HARDWARE_FP_SIZE LONG_DOUBLE_TYPE_SIZE
61 /* The following provide a functional interface for the front end Ada code
62 to determine the sizes that are used for various C types. */
65 get_target_bits_per_unit (void)
71 get_target_bits_per_word (void)
77 get_target_char_size (void)
79 return CHAR_TYPE_SIZE;
83 get_target_wchar_t_size (void)
85 /* We never want wide characters less than "short" in Ada. */
86 return MAX (SHORT_TYPE_SIZE, WCHAR_TYPE_SIZE);
90 get_target_short_size (void)
92 return SHORT_TYPE_SIZE;
96 get_target_int_size (void)
102 get_target_long_size (void)
104 return ADA_LONG_TYPE_SIZE;
108 get_target_long_long_size (void)
110 return LONG_LONG_TYPE_SIZE;
114 get_target_float_size (void)
116 return fp_prec_to_size (FLOAT_TYPE_SIZE);
120 get_target_double_size (void)
122 return fp_prec_to_size (DOUBLE_TYPE_SIZE);
126 get_target_long_double_size (void)
128 return fp_prec_to_size (WIDEST_HARDWARE_FP_SIZE);
132 get_target_pointer_size (void)
137 /* Alignment related values, mapped to attributes for functional and
138 documentation purposes. */
140 /* Standard'Maximum_Default_Alignment. Maximum alignment that the compiler
141 might choose by default for a type or object.
143 Stricter alignment requests trigger gigi's aligning_type circuitry for
144 stack objects or objects allocated by the default allocator. */
147 get_target_maximum_default_alignment (void)
149 return BIGGEST_ALIGNMENT / BITS_PER_UNIT;
152 /* Standard'System_Allocator_Alignment. Alignment guaranteed to be honored
153 by the default allocator (System.Memory.Alloc or malloc if we have no
154 run-time library at hand).
156 Stricter alignment requests trigger gigi's aligning_type circuitry for
157 objects allocated by the default allocator. */
159 /* ??? Need a way to get info about __gnat_malloc from here (whether it is
160 handy and what alignment it honors). In the meantime, resort to malloc
161 considerations only. */
163 /* Account for MALLOC_OBSERVABLE_ALIGNMENTs here. Use this or the ABI
164 guaranteed alignment if greater. */
166 #ifdef MALLOC_OBSERVABLE_ALIGNMENT
167 #define MALLOC_ALIGNMENT MALLOC_OBSERVABLE_ALIGNMENT
169 #define MALLOC_OBSERVABLE_ALIGNMENT (2 * LONG_TYPE_SIZE)
170 #define MALLOC_ALIGNMENT \
171 MAX (MALLOC_ABI_ALIGNMENT, MALLOC_OBSERVABLE_ALIGNMENT)
175 get_target_system_allocator_alignment (void)
177 return MALLOC_ALIGNMENT / BITS_PER_UNIT;
180 /* Standard'Maximum_Allowed_Alignment. Maximum alignment that we may
181 accept for any type or object. */
183 #ifndef MAX_OFILE_ALIGNMENT
184 #define MAX_OFILE_ALIGNMENT BIGGEST_ALIGNMENT
188 get_target_maximum_allowed_alignment (void)
190 return MAX_OFILE_ALIGNMENT / BITS_PER_UNIT;
193 /* Standard'Maximum_Alignment. The single attribute initially made
194 available, now a synonym of Standard'Maximum_Default_Alignment. */
197 get_target_maximum_alignment (void)
199 return get_target_maximum_default_alignment ();
202 #ifndef FLOAT_WORDS_BIG_ENDIAN
203 #define FLOAT_WORDS_BIG_ENDIAN WORDS_BIG_ENDIAN
207 get_float_words_be (void)
209 return FLOAT_WORDS_BIG_ENDIAN;
215 return WORDS_BIG_ENDIAN;
221 return BYTES_BIG_ENDIAN;
227 return BITS_BIG_ENDIAN;
231 get_target_strict_alignment (void)
233 return STRICT_ALIGNMENT;
237 get_target_double_float_alignment (void)
239 #ifdef TARGET_ALIGN_NATURAL
240 /* This macro is only defined by the rs6000 port. */
241 if (!TARGET_ALIGN_NATURAL
242 && (DEFAULT_ABI == ABI_AIX || DEFAULT_ABI == ABI_DARWIN))
243 return 32 / BITS_PER_UNIT;
249 get_target_double_scalar_alignment (void)
251 #ifdef TARGET_ALIGN_DOUBLE
252 /* This macro is only defined by the i386 and sh ports. */
253 if (!TARGET_ALIGN_DOUBLE
258 return 32 / BITS_PER_UNIT;