1/* Define builtin-in macros for all front ends that perform preprocessing
2   Copyright (C) 2010-2020 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_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. */
123static void
124define_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.  */
137static void
138define_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.  */
193void
194define_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