1 /* Define builtin-in macros for all front ends that perform preprocessing
2 Copyright (C) 2010-2016 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 "target.h"
24 #include "tree.h"
25 #include "version.h"
26 #include "flags.h"
27 #include "cpp-id-data.h"
28 #include "cppbuiltin.h"
29
30
31 /* Parse a BASEVER version string of the format "major.minor.patchlevel"
32 or "major.minor" to extract its components. */
33 void
parse_basever(int * major,int * minor,int * patchlevel)34 parse_basever (int *major, int *minor, int *patchlevel)
35 {
36 static int s_major = -1, s_minor, s_patchlevel;
37
38 if (s_major == -1)
39 if (sscanf (BASEVER, "%d.%d.%d", &s_major, &s_minor, &s_patchlevel) != 3)
40 {
41 sscanf (BASEVER, "%d.%d", &s_major, &s_minor);
42 s_patchlevel = 0;
43 }
44
45 if (major)
46 *major = s_major;
47
48 if (minor)
49 *minor = s_minor;
50
51 if (patchlevel)
52 *patchlevel = s_patchlevel;
53 }
54
55
56 /* Define __GNUC__, __GNUC_MINOR__, __GNUC_PATCHLEVEL__ and __VERSION__. */
57 static void
define__GNUC__(cpp_reader * pfile)58 define__GNUC__ (cpp_reader *pfile)
59 {
60 int major, minor, patchlevel;
61
62 parse_basever (&major, &minor, &patchlevel);
63 cpp_define_formatted (pfile, "__GNUC__=%d", major);
64 cpp_define_formatted (pfile, "__GNUC_MINOR__=%d", minor);
65 cpp_define_formatted (pfile, "__GNUC_PATCHLEVEL__=%d", patchlevel);
66 cpp_define_formatted (pfile, "__VERSION__=\"%s\"", version_string);
67 cpp_define_formatted (pfile, "__ATOMIC_RELAXED=%d", MEMMODEL_RELAXED);
68 cpp_define_formatted (pfile, "__ATOMIC_SEQ_CST=%d", MEMMODEL_SEQ_CST);
69 cpp_define_formatted (pfile, "__ATOMIC_ACQUIRE=%d", MEMMODEL_ACQUIRE);
70 cpp_define_formatted (pfile, "__ATOMIC_RELEASE=%d", MEMMODEL_RELEASE);
71 cpp_define_formatted (pfile, "__ATOMIC_ACQ_REL=%d", MEMMODEL_ACQ_REL);
72 cpp_define_formatted (pfile, "__ATOMIC_CONSUME=%d", MEMMODEL_CONSUME);
73 }
74
75
76 /* Define various built-in CPP macros that depend on language-independent
77 compilation flags. */
78 static void
define_builtin_macros_for_compilation_flags(cpp_reader * pfile)79 define_builtin_macros_for_compilation_flags (cpp_reader *pfile)
80 {
81 if (flag_pic)
82 {
83 cpp_define_formatted (pfile, "__pic__=%d", flag_pic);
84 cpp_define_formatted (pfile, "__PIC__=%d", flag_pic);
85 }
86 if (flag_pie)
87 {
88 cpp_define_formatted (pfile, "__pie__=%d", flag_pie);
89 cpp_define_formatted (pfile, "__PIE__=%d", flag_pie);
90 }
91
92 if (flag_sanitize & SANITIZE_ADDRESS)
93 cpp_define (pfile, "__SANITIZE_ADDRESS__");
94
95 if (optimize_size)
96 cpp_define (pfile, "__OPTIMIZE_SIZE__");
97 if (optimize)
98 cpp_define (pfile, "__OPTIMIZE__");
99
100 if (fast_math_flags_set_p (&global_options))
101 cpp_define (pfile, "__FAST_MATH__");
102 if (flag_signaling_nans)
103 cpp_define (pfile, "__SUPPORT_SNAN__");
104 if (!flag_errno_math)
105 cpp_define (pfile, "__NO_MATH_ERRNO__");
106
107 cpp_define_formatted (pfile, "__FINITE_MATH_ONLY__=%d",
108 flag_finite_math_only);
109 if (flag_cilkplus)
110 cpp_define (pfile, "__cilk=200");
111
112 if (flag_check_pointer_bounds)
113 cpp_define (pfile, "__CHKP__");
114 }
115
116
117 /* Define built-in macros for LP64 targets. */
118 static void
define_builtin_macros_for_lp64(cpp_reader * pfile)119 define_builtin_macros_for_lp64 (cpp_reader *pfile)
120 {
121 if (TYPE_PRECISION (long_integer_type_node) == 64
122 && POINTER_SIZE == 64
123 && TYPE_PRECISION (integer_type_node) == 32)
124 {
125 cpp_define (pfile, "_LP64");
126 cpp_define (pfile, "__LP64__");
127 }
128 }
129
130
131 /* Define macros for size of basic C types. */
132 static void
define_builtin_macros_for_type_sizes(cpp_reader * pfile)133 define_builtin_macros_for_type_sizes (cpp_reader *pfile)
134 {
135 #define define_type_sizeof(NAME, TYPE) \
136 cpp_define_formatted (pfile, NAME"=" HOST_WIDE_INT_PRINT_DEC, \
137 tree_to_uhwi (TYPE_SIZE_UNIT (TYPE)))
138
139 define_type_sizeof ("__SIZEOF_INT__", integer_type_node);
140 define_type_sizeof ("__SIZEOF_LONG__", long_integer_type_node);
141 define_type_sizeof ("__SIZEOF_LONG_LONG__", long_long_integer_type_node);
142 define_type_sizeof ("__SIZEOF_SHORT__", short_integer_type_node);
143 define_type_sizeof ("__SIZEOF_FLOAT__", float_type_node);
144 define_type_sizeof ("__SIZEOF_DOUBLE__", double_type_node);
145 define_type_sizeof ("__SIZEOF_LONG_DOUBLE__", long_double_type_node);
146 define_type_sizeof ("__SIZEOF_SIZE_T__", size_type_node);
147
148 #undef define_type_sizeof
149
150 cpp_define_formatted (pfile, "__CHAR_BIT__=%u",
151 TYPE_PRECISION (char_type_node));
152 cpp_define_formatted (pfile, "__BIGGEST_ALIGNMENT__=%d",
153 BIGGEST_ALIGNMENT / BITS_PER_UNIT);
154
155 /* Define constants useful for implementing endian.h. */
156 cpp_define (pfile, "__ORDER_LITTLE_ENDIAN__=1234");
157 cpp_define (pfile, "__ORDER_BIG_ENDIAN__=4321");
158 cpp_define (pfile, "__ORDER_PDP_ENDIAN__=3412");
159
160 if (WORDS_BIG_ENDIAN == BYTES_BIG_ENDIAN)
161 cpp_define_formatted (pfile, "__BYTE_ORDER__=%s",
162 (WORDS_BIG_ENDIAN
163 ? "__ORDER_BIG_ENDIAN__"
164 : "__ORDER_LITTLE_ENDIAN__"));
165 else
166 {
167 /* Assert that we're only dealing with the PDP11 case. */
168 gcc_assert (!BYTES_BIG_ENDIAN);
169 gcc_assert (WORDS_BIG_ENDIAN);
170
171 cpp_define (pfile, "__BYTE_ORDER__=__ORDER_PDP_ENDIAN__");
172 }
173
174 cpp_define_formatted (pfile, "__FLOAT_WORD_ORDER__=%s",
175 (targetm.float_words_big_endian ()
176 ? "__ORDER_BIG_ENDIAN__"
177 : "__ORDER_LITTLE_ENDIAN__"));
178
179 /* ptr_type_node can't be used here since ptr_mode is only set when
180 toplev calls backend_init which is not done with -E switch. */
181 cpp_define_formatted (pfile, "__SIZEOF_POINTER__=%d",
182 1 << ceil_log2 ((POINTER_SIZE + BITS_PER_UNIT - 1) / BITS_PER_UNIT));
183 }
184
185
186 /* Define macros builtins common to all language performing CPP
187 preprocessing. */
188 void
define_language_independent_builtin_macros(cpp_reader * pfile)189 define_language_independent_builtin_macros (cpp_reader *pfile)
190 {
191 define__GNUC__ (pfile);
192 define_builtin_macros_for_compilation_flags (pfile);
193 define_builtin_macros_for_lp64 (pfile);
194 define_builtin_macros_for_type_sizes (pfile);
195 }
196