gcc/cppbuiltin.c

   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
  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
  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
  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 (flag_sanitize & SANITIZE_THREAD)
  96     cpp_define (pfile, "__SANITIZE_THREAD__");
  97
  98   if (optimize_size)
  99     cpp_define (pfile, "__OPTIMIZE_SIZE__");
 100   if (optimize)
 101     cpp_define (pfile, "__OPTIMIZE__");
 102
 103   if (fast_math_flags_set_p (&global_options))
 104     cpp_define (pfile, "__FAST_MATH__");
 105   if (flag_signaling_nans)
 106     cpp_define (pfile, "__SUPPORT_SNAN__");
 107   if (!flag_errno_math)
 108     cpp_define (pfile, "__NO_MATH_ERRNO__");
 109
 110   cpp_define_formatted (pfile, "__FINITE_MATH_ONLY__=%d",
 111                         flag_finite_math_only);
 112   if (flag_cilkplus)
 113     cpp_define (pfile, "__cilk=200");
 114
 115   if (flag_check_pointer_bounds)
 116     cpp_define (pfile, "__CHKP__");
 117 }
 118
 119
 120 /* Define built-in macros for LP64 targets. */
 121 static void
 122 define_builtin_macros_for_lp64 (cpp_reader *pfile)
 123 {
 124   if (TYPE_PRECISION (long_integer_type_node) == 64
 125       && POINTER_SIZE == 64
 126       && TYPE_PRECISION (integer_type_node) == 32)
 127     {
 128       cpp_define (pfile, "_LP64");
 129       cpp_define (pfile, "__LP64__");
 130     }
 131 }
 132
 133
 134 /* Define macros for size of basic C types.  */
 135 static void
 136 define_builtin_macros_for_type_sizes (cpp_reader *pfile)
 137 {
 138 #define define_type_sizeof(NAME, TYPE)                             \
 139     cpp_define_formatted (pfile, NAME"=" HOST_WIDE_INT_PRINT_DEC,   \
 140                           tree_to_uhwi (TYPE_SIZE_UNIT (TYPE)))
 141
 142   define_type_sizeof ("__SIZEOF_INT__", integer_type_node);
 143   define_type_sizeof ("__SIZEOF_LONG__", long_integer_type_node);
 144   define_type_sizeof ("__SIZEOF_LONG_LONG__", long_long_integer_type_node);
 145   define_type_sizeof ("__SIZEOF_SHORT__", short_integer_type_node);
 146   define_type_sizeof ("__SIZEOF_FLOAT__", float_type_node);
 147   define_type_sizeof ("__SIZEOF_DOUBLE__", double_type_node);
 148   define_type_sizeof ("__SIZEOF_LONG_DOUBLE__", long_double_type_node);
 149   define_type_sizeof ("__SIZEOF_SIZE_T__", size_type_node);
 150
 151 #undef define_type_sizeof
 152
 153   cpp_define_formatted (pfile, "__CHAR_BIT__=%u",
 154                         TYPE_PRECISION (char_type_node));
 155   cpp_define_formatted (pfile, "__BIGGEST_ALIGNMENT__=%d",
 156                         BIGGEST_ALIGNMENT / BITS_PER_UNIT);
 157
 158   /* Define constants useful for implementing endian.h.  */
 159   cpp_define (pfile, "__ORDER_LITTLE_ENDIAN__=1234");
 160   cpp_define (pfile, "__ORDER_BIG_ENDIAN__=4321");
 161   cpp_define (pfile, "__ORDER_PDP_ENDIAN__=3412");
 162
 163   if (WORDS_BIG_ENDIAN == BYTES_BIG_ENDIAN)
 164     cpp_define_formatted (pfile, "__BYTE_ORDER__=%s",
 165                           (WORDS_BIG_ENDIAN
 166                            ? "__ORDER_BIG_ENDIAN__"
 167                            : "__ORDER_LITTLE_ENDIAN__"));
 168   else
 169     {
 170       /* Assert that we're only dealing with the PDP11 case.  */
 171       gcc_assert (!BYTES_BIG_ENDIAN);
 172       gcc_assert (WORDS_BIG_ENDIAN);
 173
 174       cpp_define (pfile, "__BYTE_ORDER__=__ORDER_PDP_ENDIAN__");
 175     }
 176
 177   cpp_define_formatted (pfile, "__FLOAT_WORD_ORDER__=%s",
 178                         (targetm.float_words_big_endian ()
 179                          ? "__ORDER_BIG_ENDIAN__"
 180                          : "__ORDER_LITTLE_ENDIAN__"));
 181
 182   /* ptr_type_node can't be used here since ptr_mode is only set when
 183      toplev calls backend_init which is not done with -E switch.  */
 184   cpp_define_formatted (pfile, "__SIZEOF_POINTER__=%d",
 185                         1 << ceil_log2 ((POINTER_SIZE + BITS_PER_UNIT - 1) / BITS_PER_UNIT));
 186 }
 187
 188
 189 /* Define macros builtins common to all language performing CPP
 190    preprocessing.  */
 191 void
 192 define_language_independent_builtin_macros (cpp_reader *pfile)
 193 {
 194   define__GNUC__ (pfile);
 195   define_builtin_macros_for_compilation_flags (pfile);
 196   define_builtin_macros_for_lp64 (pfile);
 197   define_builtin_macros_for_type_sizes (pfile);
 198 }