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
  32
  33 /* Parse a BASEVER version string of the format "major.minor.patchlevel"
  34    or "major.minor" to extract its components.  */
  35 void
  36 parse_basever (int *major, int *minor, int *patchlevel)
  37 {
  38   static int s_major = -1, s_minor, s_patchlevel;
  39
  40   if (s_major == -1)
  41     if (sscanf (BASEVER, "%d.%d.%d", &s_major, &s_minor, &s_patchlevel) != 3)
  42       {
  43         sscanf (BASEVER, "%d.%d", &s_major, &s_minor);
  44         s_patchlevel = 0;
  45       }
  46
  47   if (major)
  48     *major = s_major;
  49
  50   if (minor)
  51     *minor = s_minor;
  52
  53   if (patchlevel)
  54     *patchlevel = s_patchlevel;
  55 }
  56
  57
  58 /* Define __GNUC__, __GNUC_MINOR__, __GNUC_PATCHLEVEL__ and __VERSION__.  */
  59 static void
  60 define__GNUC__ (cpp_reader *pfile)
  61 {
  62   int major, minor, patchlevel;
  63
  64   parse_basever (&major, &minor, &patchlevel);
  65   cpp_define_formatted (pfile, "__GNUC__=%d", major);
  66   cpp_define_formatted (pfile, "__GNUC_MINOR__=%d", minor);
  67   cpp_define_formatted (pfile, "__GNUC_PATCHLEVEL__=%d", patchlevel);
  68   cpp_define_formatted (pfile, "__VERSION__=\"%s\"", version_string);
  69 }
  70
  71
  72 /* Define various built-in CPP macros that depend on language-independent
  73    compilation flags.  */
  74 static void
  75 define_builtin_macros_for_compilation_flags (cpp_reader *pfile)
  76 {
  77   if (flag_pic)
  78     {
  79       cpp_define_formatted (pfile, "__pic__=%d", flag_pic);
  80       cpp_define_formatted (pfile, "__PIC__=%d", flag_pic);
  81     }
  82   if (flag_pie)
  83     {
  84       cpp_define_formatted (pfile, "__pie__=%d", flag_pie);
  85       cpp_define_formatted (pfile, "__PIE__=%d", flag_pie);
  86     }
  87
  88   if (optimize_size)
  89     cpp_define (pfile, "__OPTIMIZE_SIZE__");
  90   if (optimize)
  91     cpp_define (pfile, "__OPTIMIZE__");
  92
  93   if (fast_math_flags_set_p ())
  94     cpp_define (pfile, "__FAST_MATH__");
  95   if (flag_signaling_nans)
  96     cpp_define (pfile, "__SUPPORT_SNAN__");
  97
  98   cpp_define_formatted (pfile, "__FINITE_MATH_ONLY__=%d",
  99                         flag_finite_math_only);
 100 }
 101
 102
 103 /* Define built-in macros for LP64 targets. */
 104 static void
 105 define_builtin_macros_for_lp64 (cpp_reader *pfile)
 106 {
 107   if (TYPE_PRECISION (long_integer_type_node) == 64
 108       && POINTER_SIZE == 64
 109       && TYPE_PRECISION (integer_type_node) == 32)
 110     {
 111       cpp_define (pfile, "_LP64");
 112       cpp_define (pfile, "__LP64__");
 113     }
 114 }
 115
 116
 117 /* Define macros for size of basic C types.  */
 118 static void
 119 define_builtin_macros_for_type_sizes (cpp_reader *pfile)
 120 {
 121 #define define_type_sizeof(NAME, TYPE)                             \
 122     cpp_define_formatted (pfile, NAME"="HOST_WIDE_INT_PRINT_DEC,   \
 123                           tree_low_cst (TYPE_SIZE_UNIT (TYPE), 1))
 124
 125   define_type_sizeof ("__SIZEOF_INT__", integer_type_node);
 126   define_type_sizeof ("__SIZEOF_LONG__", long_integer_type_node);
 127   define_type_sizeof ("__SIZEOF_LONG_LONG__", long_long_integer_type_node);
 128   define_type_sizeof ("__SIZEOF_SHORT__", short_integer_type_node);
 129   define_type_sizeof ("__SIZEOF_FLOAT__", float_type_node);
 130   define_type_sizeof ("__SIZEOF_DOUBLE__", double_type_node);
 131   define_type_sizeof ("__SIZEOF_LONG_DOUBLE__", long_double_type_node);
 132   define_type_sizeof ("__SIZEOF_SIZE_T__", size_type_node);
 133
 134 #undef define_type_sizeof
 135
 136   cpp_define_formatted (pfile, "__CHAR_BIT__=%u",
 137                         TYPE_PRECISION (char_type_node));
 138   cpp_define_formatted (pfile, "__BIGGEST_ALIGNMENT__=%d",
 139                         BIGGEST_ALIGNMENT / BITS_PER_UNIT);
 140
 141   /* Define constants useful for implementing endian.h.  */
 142   cpp_define (pfile, "__ORDER_LITTLE_ENDIAN__=1234");
 143   cpp_define (pfile, "__ORDER_BIG_ENDIAN__=4321");
 144   cpp_define (pfile, "__ORDER_PDP_ENDIAN__=3412");
 145
 146   if (WORDS_BIG_ENDIAN == BYTES_BIG_ENDIAN)
 147     cpp_define_formatted (pfile, "__BYTE_ORDER__=%s",
 148                           (WORDS_BIG_ENDIAN
 149                            ? "__ORDER_BIG_ENDIAN__"
 150                            : "__ORDER_LITTLE_ENDIAN__"));
 151   else
 152     {
 153       /* Assert that we're only dealing with the PDP11 case.  */
 154       gcc_assert (!BYTES_BIG_ENDIAN && WORDS_BIG_ENDIAN);
 155
 156       cpp_define (pfile, "__BYTE_ORDER__=__ORDER_PDP_ENDIAN__");
 157     }
 158
 159   /* ptr_type_node can't be used here since ptr_mode is only set when
 160      toplev calls backend_init which is not done with -E switch.  */
 161   cpp_define_formatted (pfile, "__SIZEOF_POINTER__=%d",
 162                         POINTER_SIZE / BITS_PER_UNIT);
 163 }
 164
 165
 166 /* Define macros builtins common to all language performing CPP
 167    preprocessing.  */
 168 void
 169 define_language_independent_builtin_macros (cpp_reader *pfile)
 170 {
 171   define__GNUC__ (pfile);
 172   define_builtin_macros_for_compilation_flags (pfile);
 173   define_builtin_macros_for_lp64 (pfile);
 174   define_builtin_macros_for_type_sizes (pfile);
 175 }