gcc/cppbuiltin.c

   1 /* Define builtin-in macros for all front ends that perform preprocessing
   2    Copyright (C) 2010
   3    Free Software Foundation, Inc.
   4
   5 This file is part of GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify it under
   8 the terms of the GNU General Public License as published by the Free
   9 Software Foundation; either version 3, or (at your option) any later
  10 version.
  11
  12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15 for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GCC; see the file COPYING3.  If not see
  19 <http://www.gnu.org/licenses/>.  */
  20
  21 #include "config.h"
  22 #include "system.h"
  23 #include "coretypes.h"
  24 #include "tm.h"
  25 #include "tree.h"
  26 #include "version.h"
  27 #include "flags.h"
  28 #include "toplev.h"
  29 #include "cpp-id-data.h"
  30 #include "cppbuiltin.h"
  31 #include "target.h"
  32
  33
  34 /* Parse a BASEVER version string of the format "major.minor.patchlevel"
  35    or "major.minor" to extract its components.  */
  36 void
  37 parse_basever (int *major, int *minor, int *patchlevel)
  38 {
  39   static int s_major = -1, s_minor, s_patchlevel;
  40
  41   if (s_major == -1)
  42     if (sscanf (BASEVER, "%d.%d.%d", &s_major, &s_minor, &s_patchlevel) != 3)
  43       {
  44         sscanf (BASEVER, "%d.%d", &s_major, &s_minor);
  45         s_patchlevel = 0;
  46       }
  47
  48   if (major)
  49     *major = s_major;
  50
  51   if (minor)
  52     *minor = s_minor;
  53
  54   if (patchlevel)
  55     *patchlevel = s_patchlevel;
  56 }
  57
  58
  59 /* Define __GNUC__, __GNUC_MINOR__, __GNUC_PATCHLEVEL__ and __VERSION__.  */
  60 static void
  61 define__GNUC__ (cpp_reader *pfile)
  62 {
  63   int major, minor, patchlevel;
  64
  65   parse_basever (&major, &minor, &patchlevel);
  66   cpp_define_formatted (pfile, "__GNUC__=%d", major);
  67   cpp_define_formatted (pfile, "__GNUC_MINOR__=%d", minor);
  68   cpp_define_formatted (pfile, "__GNUC_PATCHLEVEL__=%d", patchlevel);
  69   cpp_define_formatted (pfile, "__VERSION__=\"%s\"", version_string);
  70 }
  71
  72
  73 /* Define various built-in CPP macros that depend on language-independent
  74    compilation flags.  */
  75 static void
  76 define_builtin_macros_for_compilation_flags (cpp_reader *pfile)
  77 {
  78   if (flag_pic)
  79     {
  80       cpp_define_formatted (pfile, "__pic__=%d", flag_pic);
  81       cpp_define_formatted (pfile, "__PIC__=%d", flag_pic);
  82     }
  83   if (flag_pie)
  84     {
  85       cpp_define_formatted (pfile, "__pie__=%d", flag_pie);
  86       cpp_define_formatted (pfile, "__PIE__=%d", flag_pie);
  87     }
  88
  89   if (optimize_size)
  90     cpp_define (pfile, "__OPTIMIZE_SIZE__");
  91   if (optimize)
  92     cpp_define (pfile, "__OPTIMIZE__");
  93
  94   if (fast_math_flags_set_p (&global_options))
  95     cpp_define (pfile, "__FAST_MATH__");
  96   if (flag_signaling_nans)
  97     cpp_define (pfile, "__SUPPORT_SNAN__");
  98
  99   cpp_define_formatted (pfile, "__FINITE_MATH_ONLY__=%d",
 100                         flag_finite_math_only);
 101 }
 102
 103
 104 /* Define built-in macros for LP64 targets. */
 105 static void
 106 define_builtin_macros_for_lp64 (cpp_reader *pfile)
 107 {
 108   if (TYPE_PRECISION (long_integer_type_node) == 64
 109       && POINTER_SIZE == 64
 110       && TYPE_PRECISION (integer_type_node) == 32)
 111     {
 112       cpp_define (pfile, "_LP64");
 113       cpp_define (pfile, "__LP64__");
 114     }
 115 }
 116
 117
 118 /* Define macros for size of basic C types.  */
 119 static void
 120 define_builtin_macros_for_type_sizes (cpp_reader *pfile)
 121 {
 122 #define define_type_sizeof(NAME, TYPE)                             \
 123     cpp_define_formatted (pfile, NAME"="HOST_WIDE_INT_PRINT_DEC,   \
 124                           tree_low_cst (TYPE_SIZE_UNIT (TYPE), 1))
 125
 126   define_type_sizeof ("__SIZEOF_INT__", integer_type_node);
 127   define_type_sizeof ("__SIZEOF_LONG__", long_integer_type_node);
 128   define_type_sizeof ("__SIZEOF_LONG_LONG__", long_long_integer_type_node);
 129   define_type_sizeof ("__SIZEOF_SHORT__", short_integer_type_node);
 130   define_type_sizeof ("__SIZEOF_FLOAT__", float_type_node);
 131   define_type_sizeof ("__SIZEOF_DOUBLE__", double_type_node);
 132   define_type_sizeof ("__SIZEOF_LONG_DOUBLE__", long_double_type_node);
 133   define_type_sizeof ("__SIZEOF_SIZE_T__", size_type_node);
 134
 135 #undef define_type_sizeof
 136
 137   cpp_define_formatted (pfile, "__CHAR_BIT__=%u",
 138                         TYPE_PRECISION (char_type_node));
 139   cpp_define_formatted (pfile, "__BIGGEST_ALIGNMENT__=%d",
 140                         BIGGEST_ALIGNMENT / BITS_PER_UNIT);
 141
 142   /* Define constants useful for implementing endian.h.  */
 143   cpp_define (pfile, "__ORDER_LITTLE_ENDIAN__=1234");
 144   cpp_define (pfile, "__ORDER_BIG_ENDIAN__=4321");
 145   cpp_define (pfile, "__ORDER_PDP_ENDIAN__=3412");
 146
 147   if (WORDS_BIG_ENDIAN == BYTES_BIG_ENDIAN)
 148     cpp_define_formatted (pfile, "__BYTE_ORDER__=%s",
 149                           (WORDS_BIG_ENDIAN
 150                            ? "__ORDER_BIG_ENDIAN__"
 151                            : "__ORDER_LITTLE_ENDIAN__"));
 152   else
 153     {
 154       /* Assert that we're only dealing with the PDP11 case.  */
 155       gcc_assert (!BYTES_BIG_ENDIAN);
 156       gcc_assert (WORDS_BIG_ENDIAN);
 157
 158       cpp_define (pfile, "__BYTE_ORDER__=__ORDER_PDP_ENDIAN__");
 159     }
 160
 161   cpp_define_formatted (pfile, "__FLOAT_WORD_ORDER__=%s",
 162                         (targetm.float_words_big_endian ()
 163                          ? "__ORDER_BIG_ENDIAN__"
 164                          : "__ORDER_LITTLE_ENDIAN__"));
 165
 166   /* ptr_type_node can't be used here since ptr_mode is only set when
 167      toplev calls backend_init which is not done with -E switch.  */
 168   cpp_define_formatted (pfile, "__SIZEOF_POINTER__=%d",
 169                         POINTER_SIZE / BITS_PER_UNIT);
 170 }
 171
 172
 173 /* Define macros builtins common to all language performing CPP
 174    preprocessing.  */
 175 void
 176 define_language_independent_builtin_macros (cpp_reader *pfile)
 177 {
 178   define__GNUC__ (pfile);
 179   define_builtin_macros_for_compilation_flags (pfile);
 180   define_builtin_macros_for_lp64 (pfile);
 181   define_builtin_macros_for_type_sizes (pfile);
 182 }