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 "cpp-id-data.h"
  29 #include "cppbuiltin.h"
  30 #include "target.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   cpp_define_formatted (pfile, "__ATOMIC_RELAXED=%d", MEMMODEL_RELAXED);
  70   cpp_define_formatted (pfile, "__ATOMIC_SEQ_CST=%d", MEMMODEL_SEQ_CST);
  71   cpp_define_formatted (pfile, "__ATOMIC_ACQUIRE=%d", MEMMODEL_ACQUIRE);
  72   cpp_define_formatted (pfile, "__ATOMIC_RELEASE=%d", MEMMODEL_RELEASE);
  73   cpp_define_formatted (pfile, "__ATOMIC_ACQ_REL=%d", MEMMODEL_ACQ_REL);
  74   cpp_define_formatted (pfile, "__ATOMIC_CONSUME=%d", MEMMODEL_CONSUME);
  75 }
  76
  77
  78 /* Define various built-in CPP macros that depend on language-independent
  79    compilation flags.  */
  80 static void
  81 define_builtin_macros_for_compilation_flags (cpp_reader *pfile)
  82 {
  83   if (flag_pic)
  84     {
  85       cpp_define_formatted (pfile, "__pic__=%d", flag_pic);
  86       cpp_define_formatted (pfile, "__PIC__=%d", flag_pic);
  87     }
  88   if (flag_pie)
  89     {
  90       cpp_define_formatted (pfile, "__pie__=%d", flag_pie);
  91       cpp_define_formatted (pfile, "__PIE__=%d", flag_pie);
  92     }
  93
  94   if (optimize_size)
  95     cpp_define (pfile, "__OPTIMIZE_SIZE__");
  96   if (optimize)
  97     cpp_define (pfile, "__OPTIMIZE__");
  98
  99   if (fast_math_flags_set_p (&global_options))
 100     cpp_define (pfile, "__FAST_MATH__");
 101   if (flag_signaling_nans)
 102     cpp_define (pfile, "__SUPPORT_SNAN__");
 103
 104   cpp_define_formatted (pfile, "__FINITE_MATH_ONLY__=%d",
 105                         flag_finite_math_only);
 106 }
 107
 108
 109 /* Define built-in macros for LP64 targets. */
 110 static void
 111 define_builtin_macros_for_lp64 (cpp_reader *pfile)
 112 {
 113   if (TYPE_PRECISION (long_integer_type_node) == 64
 114       && POINTER_SIZE == 64
 115       && TYPE_PRECISION (integer_type_node) == 32)
 116     {
 117       cpp_define (pfile, "_LP64");
 118       cpp_define (pfile, "__LP64__");
 119     }
 120 }
 121
 122
 123 /* Define macros for size of basic C types.  */
 124 static void
 125 define_builtin_macros_for_type_sizes (cpp_reader *pfile)
 126 {
 127 #define define_type_sizeof(NAME, TYPE)                             \
 128     cpp_define_formatted (pfile, NAME"="HOST_WIDE_INT_PRINT_DEC,   \
 129                           tree_low_cst (TYPE_SIZE_UNIT (TYPE), 1))
 130
 131   define_type_sizeof ("__SIZEOF_INT__", integer_type_node);
 132   define_type_sizeof ("__SIZEOF_LONG__", long_integer_type_node);
 133   define_type_sizeof ("__SIZEOF_LONG_LONG__", long_long_integer_type_node);
 134   define_type_sizeof ("__SIZEOF_SHORT__", short_integer_type_node);
 135   define_type_sizeof ("__SIZEOF_FLOAT__", float_type_node);
 136   define_type_sizeof ("__SIZEOF_DOUBLE__", double_type_node);
 137   define_type_sizeof ("__SIZEOF_LONG_DOUBLE__", long_double_type_node);
 138   define_type_sizeof ("__SIZEOF_SIZE_T__", size_type_node);
 139
 140 #undef define_type_sizeof
 141
 142   cpp_define_formatted (pfile, "__CHAR_BIT__=%u",
 143                         TYPE_PRECISION (char_type_node));
 144   cpp_define_formatted (pfile, "__BIGGEST_ALIGNMENT__=%d",
 145                         BIGGEST_ALIGNMENT / BITS_PER_UNIT);
 146
 147   /* Define constants useful for implementing endian.h.  */
 148   cpp_define (pfile, "__ORDER_LITTLE_ENDIAN__=1234");
 149   cpp_define (pfile, "__ORDER_BIG_ENDIAN__=4321");
 150   cpp_define (pfile, "__ORDER_PDP_ENDIAN__=3412");
 151
 152   if (WORDS_BIG_ENDIAN == BYTES_BIG_ENDIAN)
 153     cpp_define_formatted (pfile, "__BYTE_ORDER__=%s",
 154                           (WORDS_BIG_ENDIAN
 155                            ? "__ORDER_BIG_ENDIAN__"
 156                            : "__ORDER_LITTLE_ENDIAN__"));
 157   else
 158     {
 159       /* Assert that we're only dealing with the PDP11 case.  */
 160       gcc_assert (!BYTES_BIG_ENDIAN);
 161       gcc_assert (WORDS_BIG_ENDIAN);
 162
 163       cpp_define (pfile, "__BYTE_ORDER__=__ORDER_PDP_ENDIAN__");
 164     }
 165
 166   cpp_define_formatted (pfile, "__FLOAT_WORD_ORDER__=%s",
 167                         (targetm.float_words_big_endian ()
 168                          ? "__ORDER_BIG_ENDIAN__"
 169                          : "__ORDER_LITTLE_ENDIAN__"));
 170
 171   /* ptr_type_node can't be used here since ptr_mode is only set when
 172      toplev calls backend_init which is not done with -E switch.  */
 173   cpp_define_formatted (pfile, "__SIZEOF_POINTER__=%d",
 174                         POINTER_SIZE / BITS_PER_UNIT);
 175 }
 176
 177
 178 /* Define macros builtins common to all language performing CPP
 179    preprocessing.  */
 180 void
 181 define_language_independent_builtin_macros (cpp_reader *pfile)
 182 {
 183   define__GNUC__ (pfile);
 184   define_builtin_macros_for_compilation_flags (pfile);
 185   define_builtin_macros_for_lp64 (pfile);
 186   define_builtin_macros_for_type_sizes (pfile);
 187 }