1/* Define builtin-in macros for all front ends that perform preprocessing
2 Copyright (C) 2010-2023 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: &major, minor: &minor, patchlevel: &patchlevel);
64 cpp_define_formatted (pfile, fmt: "__GNUC__=%d", major);
65 cpp_define_formatted (pfile, fmt: "__GNUC_MINOR__=%d", minor);
66 cpp_define_formatted (pfile, fmt: "__GNUC_PATCHLEVEL__=%d", patchlevel);
67 cpp_define_formatted (pfile, fmt: "__VERSION__=\"%s\"", version_string);
68 cpp_define_formatted (pfile, fmt: "__ATOMIC_RELAXED=%d", MEMMODEL_RELAXED);
69 cpp_define_formatted (pfile, fmt: "__ATOMIC_SEQ_CST=%d", MEMMODEL_SEQ_CST);
70 cpp_define_formatted (pfile, fmt: "__ATOMIC_ACQUIRE=%d", MEMMODEL_ACQUIRE);
71 cpp_define_formatted (pfile, fmt: "__ATOMIC_RELEASE=%d", MEMMODEL_RELEASE);
72 cpp_define_formatted (pfile, fmt: "__ATOMIC_ACQ_REL=%d", MEMMODEL_ACQ_REL);
73 cpp_define_formatted (pfile, fmt: "__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, fmt: "__pic__=%d", flag_pic);
85 cpp_define_formatted (pfile, fmt: "__PIC__=%d", flag_pic);
86 }
87 if (flag_pie)
88 {
89 cpp_define_formatted (pfile, fmt: "__pie__=%d", flag_pie);
90 cpp_define_formatted (pfile, fmt: "__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_THREAD)
100 cpp_define (pfile, "__SANITIZE_THREAD__");
101
102 if (optimize_size)
103 cpp_define (pfile, "__OPTIMIZE_SIZE__");
104 if (optimize)
105 cpp_define (pfile, "__OPTIMIZE__");
106
107 if (fast_math_flags_set_p (&global_options))
108 cpp_define (pfile, "__FAST_MATH__");
109 if (flag_signaling_nans)
110 cpp_define (pfile, "__SUPPORT_SNAN__");
111 if (!flag_errno_math)
112 cpp_define (pfile, "__NO_MATH_ERRNO__");
113 if (flag_reciprocal_math)
114 cpp_define (pfile, "__RECIPROCAL_MATH__");
115 if (!flag_signed_zeros)
116 cpp_define (pfile, "__NO_SIGNED_ZEROS__");
117 if (!flag_trapping_math)
118 cpp_define (pfile, "__NO_TRAPPING_MATH__");
119 if (flag_associative_math)
120 cpp_define (pfile, "__ASSOCIATIVE_MATH__");
121 if (flag_rounding_math)
122 cpp_define (pfile, "__ROUNDING_MATH__");
123
124 cpp_define_formatted (pfile, fmt: "__FINITE_MATH_ONLY__=%d",
125 flag_finite_math_only);
126}
127
128
129/* Define built-in macros for LP64 targets. */
130static void
131define_builtin_macros_for_lp64 (cpp_reader *pfile)
132{
133 if (TYPE_PRECISION (long_integer_type_node) == 64
134 && POINTER_SIZE == 64
135 && TYPE_PRECISION (integer_type_node) == 32)
136 {
137 cpp_define (pfile, "_LP64");
138 cpp_define (pfile, "__LP64__");
139 }
140}
141
142
143/* Define macros for size of basic C types. */
144static void
145define_builtin_macros_for_type_sizes (cpp_reader *pfile)
146{
147#define define_type_sizeof(NAME, TYPE) \
148 cpp_define_formatted (pfile, NAME"=" HOST_WIDE_INT_PRINT_DEC, \
149 tree_to_uhwi (TYPE_SIZE_UNIT (TYPE)))
150
151 define_type_sizeof ("__SIZEOF_INT__", integer_type_node);
152 define_type_sizeof ("__SIZEOF_LONG__", long_integer_type_node);
153 define_type_sizeof ("__SIZEOF_LONG_LONG__", long_long_integer_type_node);
154 define_type_sizeof ("__SIZEOF_SHORT__", short_integer_type_node);
155 define_type_sizeof ("__SIZEOF_FLOAT__", float_type_node);
156 define_type_sizeof ("__SIZEOF_DOUBLE__", double_type_node);
157 define_type_sizeof ("__SIZEOF_LONG_DOUBLE__", long_double_type_node);
158 define_type_sizeof ("__SIZEOF_SIZE_T__", size_type_node);
159
160#undef define_type_sizeof
161
162 cpp_define_formatted (pfile, fmt: "__CHAR_BIT__=%u",
163 TYPE_PRECISION (char_type_node));
164 cpp_define_formatted (pfile, fmt: "__BIGGEST_ALIGNMENT__=%d",
165 BIGGEST_ALIGNMENT / BITS_PER_UNIT);
166
167 /* Define constants useful for implementing endian.h. */
168 cpp_define (pfile, "__ORDER_LITTLE_ENDIAN__=1234");
169 cpp_define (pfile, "__ORDER_BIG_ENDIAN__=4321");
170 cpp_define (pfile, "__ORDER_PDP_ENDIAN__=3412");
171
172 if (WORDS_BIG_ENDIAN == BYTES_BIG_ENDIAN)
173 cpp_define_formatted (pfile, fmt: "__BYTE_ORDER__=%s",
174 (WORDS_BIG_ENDIAN
175 ? "__ORDER_BIG_ENDIAN__"
176 : "__ORDER_LITTLE_ENDIAN__"));
177 else
178 {
179 /* Assert that we're only dealing with the PDP11 case. */
180 gcc_assert (!BYTES_BIG_ENDIAN);
181 gcc_assert (WORDS_BIG_ENDIAN);
182
183 cpp_define (pfile, "__BYTE_ORDER__=__ORDER_PDP_ENDIAN__");
184 }
185
186 cpp_define_formatted (pfile, fmt: "__FLOAT_WORD_ORDER__=%s",
187 (targetm.float_words_big_endian ()
188 ? "__ORDER_BIG_ENDIAN__"
189 : "__ORDER_LITTLE_ENDIAN__"));
190
191 /* ptr_type_node can't be used here since ptr_mode is only set when
192 toplev calls backend_init which is not done with -E switch. */
193 cpp_define_formatted (pfile, fmt: "__SIZEOF_POINTER__=%d",
194 1 << ceil_log2 (x: (POINTER_SIZE + BITS_PER_UNIT - 1) / BITS_PER_UNIT));
195}
196
197
198/* Define macros builtins common to all language performing CPP
199 preprocessing. */
200void
201define_language_independent_builtin_macros (cpp_reader *pfile)
202{
203 define__GNUC__ (pfile);
204 define_builtin_macros_for_compilation_flags (pfile);
205 define_builtin_macros_for_lp64 (pfile);
206 define_builtin_macros_for_type_sizes (pfile);
207}
208

source code of gcc/cppbuiltin.cc