gcc/cppbuiltin.c

   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
  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
  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
  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_THREAD)
  97     cpp_define (pfile, "__SANITIZE_THREAD__");
  98
  99   if (optimize_size)
 100     cpp_define (pfile, "__OPTIMIZE_SIZE__");
 101   if (optimize)
 102     cpp_define (pfile, "__OPTIMIZE__");
 103
 104   if (fast_math_flags_set_p (&global_options))
 105     cpp_define (pfile, "__FAST_MATH__");
 106   if (flag_signaling_nans)
 107     cpp_define (pfile, "__SUPPORT_SNAN__");
 108   if (!flag_errno_math)
 109     cpp_define (pfile, "__NO_MATH_ERRNO__");
 110
 111   cpp_define_formatted (pfile, "__FINITE_MATH_ONLY__=%d",
 112                         flag_finite_math_only);
 113 }
 114
 115
 116 /* Define built-in macros for LP64 targets. */
 117 static void
 118 define_builtin_macros_for_lp64 (cpp_reader *pfile)
 119 {
 120   if (TYPE_PRECISION (long_integer_type_node) == 64
 121       && POINTER_SIZE == 64
 122       && TYPE_PRECISION (integer_type_node) == 32)
 123     {
 124       cpp_define (pfile, "_LP64");
 125       cpp_define (pfile, "__LP64__");
 126     }
 127 }
 128
 129
 130 /* Define macros for size of basic C types.  */
 131 static void
 132 define_builtin_macros_for_type_sizes (cpp_reader *pfile)
 133 {
 134 #define define_type_sizeof(NAME, TYPE)                             \
 135     cpp_define_formatted (pfile, NAME"=" HOST_WIDE_INT_PRINT_DEC,   \
 136                           tree_to_uhwi (TYPE_SIZE_UNIT (TYPE)))
 137
 138   define_type_sizeof ("__SIZEOF_INT__", integer_type_node);
 139   define_type_sizeof ("__SIZEOF_LONG__", long_integer_type_node);
 140   define_type_sizeof ("__SIZEOF_LONG_LONG__", long_long_integer_type_node);
 141   define_type_sizeof ("__SIZEOF_SHORT__", short_integer_type_node);
 142   define_type_sizeof ("__SIZEOF_FLOAT__", float_type_node);
 143   define_type_sizeof ("__SIZEOF_DOUBLE__", double_type_node);
 144   define_type_sizeof ("__SIZEOF_LONG_DOUBLE__", long_double_type_node);
 145   define_type_sizeof ("__SIZEOF_SIZE_T__", size_type_node);
 146
 147 #undef define_type_sizeof
 148
 149   cpp_define_formatted (pfile, "__CHAR_BIT__=%u",
 150                         TYPE_PRECISION (char_type_node));
 151   cpp_define_formatted (pfile, "__BIGGEST_ALIGNMENT__=%d",
 152                         BIGGEST_ALIGNMENT / BITS_PER_UNIT);
 153
 154   /* Define constants useful for implementing endian.h.  */
 155   cpp_define (pfile, "__ORDER_LITTLE_ENDIAN__=1234");
 156   cpp_define (pfile, "__ORDER_BIG_ENDIAN__=4321");
 157   cpp_define (pfile, "__ORDER_PDP_ENDIAN__=3412");
 158
 159   if (WORDS_BIG_ENDIAN == BYTES_BIG_ENDIAN)
 160     cpp_define_formatted (pfile, "__BYTE_ORDER__=%s",
 161                           (WORDS_BIG_ENDIAN
 162                            ? "__ORDER_BIG_ENDIAN__"
 163                            : "__ORDER_LITTLE_ENDIAN__"));
 164   else
 165     {
 166       /* Assert that we're only dealing with the PDP11 case.  */
 167       gcc_assert (!BYTES_BIG_ENDIAN);
 168       gcc_assert (WORDS_BIG_ENDIAN);
 169
 170       cpp_define (pfile, "__BYTE_ORDER__=__ORDER_PDP_ENDIAN__");
 171     }
 172
 173   cpp_define_formatted (pfile, "__FLOAT_WORD_ORDER__=%s",
 174                         (targetm.float_words_big_endian ()
 175                          ? "__ORDER_BIG_ENDIAN__"
 176                          : "__ORDER_LITTLE_ENDIAN__"));
 177
 178   /* ptr_type_node can't be used here since ptr_mode is only set when
 179      toplev calls backend_init which is not done with -E switch.  */
 180   cpp_define_formatted (pfile, "__SIZEOF_POINTER__=%d",
 181                         1 << ceil_log2 ((POINTER_SIZE + BITS_PER_UNIT - 1) / BITS_PER_UNIT));
 182 }
 183
 184
 185 /* Define macros builtins common to all language performing CPP
 186    preprocessing.  */
 187 void
 188 define_language_independent_builtin_macros (cpp_reader *pfile)
 189 {
 190   define__GNUC__ (pfile);
 191   define_builtin_macros_for_compilation_flags (pfile);
 192   define_builtin_macros_for_lp64 (pfile);
 193   define_builtin_macros_for_type_sizes (pfile);
 194 }