gcc/cppbuiltin.c

   1 /* Define builtin-in macros for all front ends that perform preprocessing
   2    Copyright (C) 2010-2015 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 "tm.h"
  24 #include "hash-set.h"
  25 #include "machmode.h"
  26 #include "vec.h"
  27 #include "double-int.h"
  28 #include "input.h"
  29 #include "alias.h"
  30 #include "symtab.h"
  31 #include "wide-int.h"
  32 #include "inchash.h"
  33 #include "tree.h"
  34 #include "version.h"
  35 #include "flags.h"
  36 #include "cpp-id-data.h"
  37 #include "cppbuiltin.h"
  38 #include "target.h"
  39
  40
  41 /* Parse a BASEVER version string of the format "major.minor.patchlevel"
  42    or "major.minor" to extract its components.  */
  43 void
  44 parse_basever (int *major, int *minor, int *patchlevel)
  45 {
  46   static int s_major = -1, s_minor, s_patchlevel;
  47
  48   if (s_major == -1)
  49     if (sscanf (BASEVER, "%d.%d.%d", &s_major, &s_minor, &s_patchlevel) != 3)
  50       {
  51         sscanf (BASEVER, "%d.%d", &s_major, &s_minor);
  52         s_patchlevel = 0;
  53       }
  54
  55   if (major)
  56     *major = s_major;
  57
  58   if (minor)
  59     *minor = s_minor;
  60
  61   if (patchlevel)
  62     *patchlevel = s_patchlevel;
  63 }
  64
  65
  66 /* Define __GNUC__, __GNUC_MINOR__, __GNUC_PATCHLEVEL__ and __VERSION__.  */
  67 static void
  68 define__GNUC__ (cpp_reader *pfile)
  69 {
  70   int major, minor, patchlevel;
  71
  72   parse_basever (&major, &minor, &patchlevel);
  73   cpp_define_formatted (pfile, "__GNUC__=%d", major);
  74   cpp_define_formatted (pfile, "__GNUC_MINOR__=%d", minor);
  75   cpp_define_formatted (pfile, "__GNUC_PATCHLEVEL__=%d", patchlevel);
  76   cpp_define_formatted (pfile, "__VERSION__=\"%s\"", version_string);
  77   cpp_define_formatted (pfile, "__ATOMIC_RELAXED=%d", MEMMODEL_RELAXED);
  78   cpp_define_formatted (pfile, "__ATOMIC_SEQ_CST=%d", MEMMODEL_SEQ_CST);
  79   cpp_define_formatted (pfile, "__ATOMIC_ACQUIRE=%d", MEMMODEL_ACQUIRE);
  80   cpp_define_formatted (pfile, "__ATOMIC_RELEASE=%d", MEMMODEL_RELEASE);
  81   cpp_define_formatted (pfile, "__ATOMIC_ACQ_REL=%d", MEMMODEL_ACQ_REL);
  82   cpp_define_formatted (pfile, "__ATOMIC_CONSUME=%d", MEMMODEL_CONSUME);
  83 }
  84
  85
  86 /* Define various built-in CPP macros that depend on language-independent
  87    compilation flags.  */
  88 static void
  89 define_builtin_macros_for_compilation_flags (cpp_reader *pfile)
  90 {
  91   if (flag_pic)
  92     {
  93       cpp_define_formatted (pfile, "__pic__=%d", flag_pic);
  94       cpp_define_formatted (pfile, "__PIC__=%d", flag_pic);
  95     }
  96   if (flag_pie)
  97     {
  98       cpp_define_formatted (pfile, "__pie__=%d", flag_pie);
  99       cpp_define_formatted (pfile, "__PIE__=%d", flag_pie);
 100     }
 101
 102   if (flag_sanitize & SANITIZE_ADDRESS)
 103     cpp_define (pfile, "__SANITIZE_ADDRESS__");
 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   if (flag_cilkplus)
 120     cpp_define (pfile, "__cilk=200");
 121
 122   if (flag_check_pointer_bounds)
 123     cpp_define (pfile, "__CHKP__");
 124 }
 125
 126
 127 /* Define built-in macros for LP64 targets. */
 128 static void
 129 define_builtin_macros_for_lp64 (cpp_reader *pfile)
 130 {
 131   if (TYPE_PRECISION (long_integer_type_node) == 64
 132       && POINTER_SIZE == 64
 133       && TYPE_PRECISION (integer_type_node) == 32)
 134     {
 135       cpp_define (pfile, "_LP64");
 136       cpp_define (pfile, "__LP64__");
 137     }
 138 }
 139
 140
 141 /* Define macros for size of basic C types.  */
 142 static void
 143 define_builtin_macros_for_type_sizes (cpp_reader *pfile)
 144 {
 145 #define define_type_sizeof(NAME, TYPE)                             \
 146     cpp_define_formatted (pfile, NAME"="HOST_WIDE_INT_PRINT_DEC,   \
 147                           tree_to_uhwi (TYPE_SIZE_UNIT (TYPE)))
 148
 149   define_type_sizeof ("__SIZEOF_INT__", integer_type_node);
 150   define_type_sizeof ("__SIZEOF_LONG__", long_integer_type_node);
 151   define_type_sizeof ("__SIZEOF_LONG_LONG__", long_long_integer_type_node);
 152   define_type_sizeof ("__SIZEOF_SHORT__", short_integer_type_node);
 153   define_type_sizeof ("__SIZEOF_FLOAT__", float_type_node);
 154   define_type_sizeof ("__SIZEOF_DOUBLE__", double_type_node);
 155   define_type_sizeof ("__SIZEOF_LONG_DOUBLE__", long_double_type_node);
 156   define_type_sizeof ("__SIZEOF_SIZE_T__", size_type_node);
 157
 158 #undef define_type_sizeof
 159
 160   cpp_define_formatted (pfile, "__CHAR_BIT__=%u",
 161                         TYPE_PRECISION (char_type_node));
 162   cpp_define_formatted (pfile, "__BIGGEST_ALIGNMENT__=%d",
 163                         BIGGEST_ALIGNMENT / BITS_PER_UNIT);
 164
 165   /* Define constants useful for implementing endian.h.  */
 166   cpp_define (pfile, "__ORDER_LITTLE_ENDIAN__=1234");
 167   cpp_define (pfile, "__ORDER_BIG_ENDIAN__=4321");
 168   cpp_define (pfile, "__ORDER_PDP_ENDIAN__=3412");
 169
 170   if (WORDS_BIG_ENDIAN == BYTES_BIG_ENDIAN)
 171     cpp_define_formatted (pfile, "__BYTE_ORDER__=%s",
 172                           (WORDS_BIG_ENDIAN
 173                            ? "__ORDER_BIG_ENDIAN__"
 174                            : "__ORDER_LITTLE_ENDIAN__"));
 175   else
 176     {
 177       /* Assert that we're only dealing with the PDP11 case.  */
 178       gcc_assert (!BYTES_BIG_ENDIAN);
 179       gcc_assert (WORDS_BIG_ENDIAN);
 180
 181       cpp_define (pfile, "__BYTE_ORDER__=__ORDER_PDP_ENDIAN__");
 182     }
 183
 184   cpp_define_formatted (pfile, "__FLOAT_WORD_ORDER__=%s",
 185                         (targetm.float_words_big_endian ()
 186                          ? "__ORDER_BIG_ENDIAN__"
 187                          : "__ORDER_LITTLE_ENDIAN__"));
 188
 189   /* ptr_type_node can't be used here since ptr_mode is only set when
 190      toplev calls backend_init which is not done with -E switch.  */
 191   cpp_define_formatted (pfile, "__SIZEOF_POINTER__=%d",
 192                         1 << ceil_log2 ((POINTER_SIZE + BITS_PER_UNIT - 1) / BITS_PER_UNIT));
 193 }
 194
 195
 196 /* Define macros builtins common to all language performing CPP
 197    preprocessing.  */
 198 void
 199 define_language_independent_builtin_macros (cpp_reader *pfile)
 200 {
 201   define__GNUC__ (pfile);
 202   define_builtin_macros_for_compilation_flags (pfile);
 203   define_builtin_macros_for_lp64 (pfile);
 204   define_builtin_macros_for_type_sizes (pfile);
 205 }