1 /* Define builtin-in macros for all front ends that perform preprocessing
2 Copyright (C) 2010-2020 Free Software Foundation, Inc.
3
4 This file is part of GCC.
5
6 GCC is free software; you can redistribute it and/or modify it under
7 the terms of the GNU General Public License as published by the Free
8 Software Foundation; either version 3, or (at your option) any later
9 version.
10
11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 for more details.
15
16 You should have received a copy of the GNU General Public License
17 along 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. */
34 void
parse_basever(int * major,int * minor,int * patchlevel)35 parse_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__. */
58 static void
define__GNUC__(cpp_reader * pfile)59 define__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. */
79 static void
define_builtin_macros_for_compilation_flags(cpp_reader * pfile)80 define_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_UNDEFINED)
97 cpp_define (pfile, "__SANITIZE_UNDEFINED__");
98
99 if (flag_sanitize & SANITIZE_LEAK)
100 cpp_define (pfile, "__SANITIZE_LEAK__");
101
102 if (flag_sanitize & SANITIZE_THREAD)
103 cpp_define (pfile, "__SANITIZE_THREAD__");
104
105 if (optimize_size)
106 cpp_define (pfile, "__OPTIMIZE_SIZE__");
107 if (optimize)
108 cpp_define (pfile, "__OPTIMIZE__");
109
110 if (fast_math_flags_set_p (&global_options))
111 cpp_define (pfile, "__FAST_MATH__");
112 if (flag_signaling_nans)
113 cpp_define (pfile, "__SUPPORT_SNAN__");
114 if (!flag_errno_math)
115 cpp_define (pfile, "__NO_MATH_ERRNO__");
116
117 cpp_define_formatted (pfile, "__FINITE_MATH_ONLY__=%d",
118 flag_finite_math_only);
119 }
120
121
122 /* Define built-in macros for LP64 targets. */
123 static void
define_builtin_macros_for_lp64(cpp_reader * pfile)124 define_builtin_macros_for_lp64 (cpp_reader *pfile)
125 {
126 if (TYPE_PRECISION (long_integer_type_node) == 64
127 && POINTER_SIZE == 64
128 && TYPE_PRECISION (integer_type_node) == 32)
129 {
130 cpp_define (pfile, "_LP64");
131 cpp_define (pfile, "__LP64__");
132 }
133 }
134
135
136 /* Define macros for size of basic C types. */
137 static void
define_builtin_macros_for_type_sizes(cpp_reader * pfile)138 define_builtin_macros_for_type_sizes (cpp_reader *pfile)
139 {
140 #define define_type_sizeof(NAME, TYPE) \
141 cpp_define_formatted (pfile, NAME"=" HOST_WIDE_INT_PRINT_DEC, \
142 tree_to_uhwi (TYPE_SIZE_UNIT (TYPE)))
143
144 define_type_sizeof ("__SIZEOF_INT__", integer_type_node);
145 define_type_sizeof ("__SIZEOF_LONG__", long_integer_type_node);
146 define_type_sizeof ("__SIZEOF_LONG_LONG__", long_long_integer_type_node);
147 define_type_sizeof ("__SIZEOF_SHORT__", short_integer_type_node);
148 define_type_sizeof ("__SIZEOF_FLOAT__", float_type_node);
149 define_type_sizeof ("__SIZEOF_DOUBLE__", double_type_node);
150 define_type_sizeof ("__SIZEOF_LONG_DOUBLE__", long_double_type_node);
151 define_type_sizeof ("__SIZEOF_SIZE_T__", size_type_node);
152
153 #undef define_type_sizeof
154
155 cpp_define_formatted (pfile, "__CHAR_BIT__=%u",
156 TYPE_PRECISION (char_type_node));
157 cpp_define_formatted (pfile, "__BIGGEST_ALIGNMENT__=%d",
158 BIGGEST_ALIGNMENT / BITS_PER_UNIT);
159
160 /* Define constants useful for implementing endian.h. */
161 cpp_define (pfile, "__ORDER_LITTLE_ENDIAN__=1234");
162 cpp_define (pfile, "__ORDER_BIG_ENDIAN__=4321");
163 cpp_define (pfile, "__ORDER_PDP_ENDIAN__=3412");
164
165 if (WORDS_BIG_ENDIAN == BYTES_BIG_ENDIAN)
166 cpp_define_formatted (pfile, "__BYTE_ORDER__=%s",
167 (WORDS_BIG_ENDIAN
168 ? "__ORDER_BIG_ENDIAN__"
169 : "__ORDER_LITTLE_ENDIAN__"));
170 else
171 {
172 /* Assert that we're only dealing with the PDP11 case. */
173 gcc_assert (!BYTES_BIG_ENDIAN);
174 gcc_assert (WORDS_BIG_ENDIAN);
175
176 cpp_define (pfile, "__BYTE_ORDER__=__ORDER_PDP_ENDIAN__");
177 }
178
179 cpp_define_formatted (pfile, "__FLOAT_WORD_ORDER__=%s",
180 (targetm.float_words_big_endian ()
181 ? "__ORDER_BIG_ENDIAN__"
182 : "__ORDER_LITTLE_ENDIAN__"));
183
184 /* ptr_type_node can't be used here since ptr_mode is only set when
185 toplev calls backend_init which is not done with -E switch. */
186 cpp_define_formatted (pfile, "__SIZEOF_POINTER__=%d",
187 1 << ceil_log2 ((POINTER_SIZE + BITS_PER_UNIT - 1) / BITS_PER_UNIT));
188 }
189
190
191 /* Define macros builtins common to all language performing CPP
192 preprocessing. */
193 void
define_language_independent_builtin_macros(cpp_reader * pfile)194 define_language_independent_builtin_macros (cpp_reader *pfile)
195 {
196 define__GNUC__ (pfile);
197 define_builtin_macros_for_compilation_flags (pfile);
198 define_builtin_macros_for_lp64 (pfile);
199 define_builtin_macros_for_type_sizes (pfile);
200 }
201