1/* Define builtin-in macros for all front ends that perform preprocessing
2   Copyright (C) 2010-2022 Free Software Foundation, Inc.
3
4This file is part of GCC.
5
6GCC is free software; you can redistribute it and/or modify it under
7the terms of the GNU General Public License as published by the Free
8Software Foundation; either version 3, or (at your option) any later
9version.
10
11GCC is distributed in the hope that it will be useful, but WITHOUT ANY
12WARRANTY; without even the implied warranty of MERCHANTABILITY or
13FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14for more details.
15
16You should have received a copy of the GNU General Public License
17along with GCC; see the file COPYING3.  If not see
18<http://www.gnu.org/licenses/>.  */
19
20#include "config.h"
21#include "system.h"
22#include "coretypes.h"
23#include "memmodel.h"
24#include "target.h"
25#include "tree.h"
26#include "version.h"
27#include "flags.h"
28#include "cpplib.h"
29#include "cppbuiltin.h"
30
31
32/* Parse a BASEVER version string of the format "major.minor.patchlevel"
33   or "major.minor" to extract its components.  */
34void
35parse_basever (int *major, int *minor, int *patchlevel)
36{
37  static int s_major = -1, s_minor, s_patchlevel;
38
39  if (s_major == -1)
40    if (sscanf (BASEVER, "%d.%d.%d", &s_major, &s_minor, &s_patchlevel) != 3)
41      {
42	sscanf (BASEVER, "%d.%d", &s_major, &s_minor);
43	s_patchlevel = 0;
44      }
45
46  if (major)
47    *major = s_major;
48
49  if (minor)
50    *minor = s_minor;
51
52  if (patchlevel)
53    *patchlevel = s_patchlevel;
54}
55
56
57/* Define __GNUC__, __GNUC_MINOR__, __GNUC_PATCHLEVEL__ and __VERSION__.  */
58static void
59define__GNUC__ (cpp_reader *pfile)
60{
61  int major, minor, patchlevel;
62
63  parse_basever (&major, &minor, &patchlevel);
64  cpp_define_formatted (pfile, "__GNUC__=%d", major);
65  cpp_define_formatted (pfile, "__GNUC_MINOR__=%d", minor);
66  cpp_define_formatted (pfile, "__GNUC_PATCHLEVEL__=%d", patchlevel);
67  cpp_define_formatted (pfile, "__VERSION__=\"%s\"", version_string);
68  cpp_define_formatted (pfile, "__ATOMIC_RELAXED=%d", MEMMODEL_RELAXED);
69  cpp_define_formatted (pfile, "__ATOMIC_SEQ_CST=%d", MEMMODEL_SEQ_CST);
70  cpp_define_formatted (pfile, "__ATOMIC_ACQUIRE=%d", MEMMODEL_ACQUIRE);
71  cpp_define_formatted (pfile, "__ATOMIC_RELEASE=%d", MEMMODEL_RELEASE);
72  cpp_define_formatted (pfile, "__ATOMIC_ACQ_REL=%d", MEMMODEL_ACQ_REL);
73  cpp_define_formatted (pfile, "__ATOMIC_CONSUME=%d", MEMMODEL_CONSUME);
74}
75
76
77/* Define various built-in CPP macros that depend on language-independent
78   compilation flags.  */
79static void
80define_builtin_macros_for_compilation_flags (cpp_reader *pfile)
81{
82  if (flag_pic)
83    {
84      cpp_define_formatted (pfile, "__pic__=%d", flag_pic);
85      cpp_define_formatted (pfile, "__PIC__=%d", flag_pic);
86    }
87  if (flag_pie)
88    {
89      cpp_define_formatted (pfile, "__pie__=%d", flag_pie);
90      cpp_define_formatted (pfile, "__PIE__=%d", flag_pie);
91    }
92
93  if (flag_sanitize & SANITIZE_ADDRESS)
94    cpp_define (pfile, "__SANITIZE_ADDRESS__");
95
96  if (flag_sanitize & SANITIZE_HWADDRESS)
97    cpp_define (pfile, "__SANITIZE_HWADDRESS__");
98
99  if (flag_sanitize & SANITIZE_UNDEFINED)
100    cpp_define (pfile, "__SANITIZE_UNDEFINED__");
101
102  if (flag_sanitize & SANITIZE_LEAK)
103    cpp_define (pfile, "__SANITIZE_LEAK__");
104
105  if (flag_sanitize & SANITIZE_THREAD)
106    cpp_define (pfile, "__SANITIZE_THREAD__");
107
108  if (optimize_size)
109    cpp_define (pfile, "__OPTIMIZE_SIZE__");
110  if (optimize)
111    cpp_define (pfile, "__OPTIMIZE__");
112
113  if (fast_math_flags_set_p (&global_options))
114    cpp_define (pfile, "__FAST_MATH__");
115  if (flag_signaling_nans)
116    cpp_define (pfile, "__SUPPORT_SNAN__");
117  if (!flag_errno_math)
118    cpp_define (pfile, "__NO_MATH_ERRNO__");
119  if (flag_reciprocal_math)
120    cpp_define (pfile, "__RECIPROCAL_MATH__");
121  if (!flag_signed_zeros)
122    cpp_define (pfile, "__NO_SIGNED_ZEROS__");
123  if (!flag_trapping_math)
124    cpp_define (pfile, "__NO_TRAPPING_MATH__");
125  if (flag_associative_math)
126    cpp_define (pfile, "__ASSOCIATIVE_MATH__");
127  if (flag_rounding_math)
128    cpp_define (pfile, "__ROUNDING_MATH__");
129
130  cpp_define_formatted (pfile, "__FINITE_MATH_ONLY__=%d",
131			flag_finite_math_only);
132}
133
134
135/* Define built-in macros for LP64 targets. */
136static void
137define_builtin_macros_for_lp64 (cpp_reader *pfile)
138{
139  if (TYPE_PRECISION (long_integer_type_node) == 64
140      && POINTER_SIZE == 64
141      && TYPE_PRECISION (integer_type_node) == 32)
142    {
143      cpp_define (pfile, "_LP64");
144      cpp_define (pfile, "__LP64__");
145    }
146}
147
148
149/* Define macros for size of basic C types.  */
150static void
151define_builtin_macros_for_type_sizes (cpp_reader *pfile)
152{
153#define define_type_sizeof(NAME, TYPE)                             \
154    cpp_define_formatted (pfile, NAME"=" HOST_WIDE_INT_PRINT_DEC,   \
155                          tree_to_uhwi (TYPE_SIZE_UNIT (TYPE)))
156
157  define_type_sizeof ("__SIZEOF_INT__", integer_type_node);
158  define_type_sizeof ("__SIZEOF_LONG__", long_integer_type_node);
159  define_type_sizeof ("__SIZEOF_LONG_LONG__", long_long_integer_type_node);
160  define_type_sizeof ("__SIZEOF_SHORT__", short_integer_type_node);
161  define_type_sizeof ("__SIZEOF_FLOAT__", float_type_node);
162  define_type_sizeof ("__SIZEOF_DOUBLE__", double_type_node);
163  define_type_sizeof ("__SIZEOF_LONG_DOUBLE__", long_double_type_node);
164  define_type_sizeof ("__SIZEOF_SIZE_T__", size_type_node);
165
166#undef define_type_sizeof
167
168  cpp_define_formatted (pfile, "__CHAR_BIT__=%u",
169			TYPE_PRECISION (char_type_node));
170  cpp_define_formatted (pfile, "__BIGGEST_ALIGNMENT__=%d",
171			BIGGEST_ALIGNMENT / BITS_PER_UNIT);
172
173  /* Define constants useful for implementing endian.h.  */
174  cpp_define (pfile, "__ORDER_LITTLE_ENDIAN__=1234");
175  cpp_define (pfile, "__ORDER_BIG_ENDIAN__=4321");
176  cpp_define (pfile, "__ORDER_PDP_ENDIAN__=3412");
177
178  if (WORDS_BIG_ENDIAN == BYTES_BIG_ENDIAN)
179    cpp_define_formatted (pfile, "__BYTE_ORDER__=%s",
180			  (WORDS_BIG_ENDIAN
181			   ? "__ORDER_BIG_ENDIAN__"
182			   : "__ORDER_LITTLE_ENDIAN__"));
183  else
184    {
185      /* Assert that we're only dealing with the PDP11 case.  */
186      gcc_assert (!BYTES_BIG_ENDIAN);
187      gcc_assert (WORDS_BIG_ENDIAN);
188
189      cpp_define (pfile, "__BYTE_ORDER__=__ORDER_PDP_ENDIAN__");
190    }
191
192  cpp_define_formatted (pfile, "__FLOAT_WORD_ORDER__=%s",
193                        (targetm.float_words_big_endian ()
194                         ? "__ORDER_BIG_ENDIAN__"
195                         : "__ORDER_LITTLE_ENDIAN__"));
196
197  /* ptr_type_node can't be used here since ptr_mode is only set when
198     toplev calls backend_init which is not done with -E switch.  */
199  cpp_define_formatted (pfile, "__SIZEOF_POINTER__=%d",
200			1 << ceil_log2 ((POINTER_SIZE + BITS_PER_UNIT - 1) / BITS_PER_UNIT));
201}
202
203
204/* Define macros builtins common to all language performing CPP
205   preprocessing.  */
206void
207define_language_independent_builtin_macros (cpp_reader *pfile)
208{
209  define__GNUC__ (pfile);
210  define_builtin_macros_for_compilation_flags (pfile);
211  define_builtin_macros_for_lp64 (pfile);
212  define_builtin_macros_for_type_sizes (pfile);
213}
214