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 "vec.h"
  26 #include "input.h"
  27 #include "alias.h"
  28 #include "symtab.h"
  29 #include "inchash.h"
  30 #include "tree.h"
  31 #include "version.h"
  32 #include "flags.h"
  33 #include "cpp-id-data.h"
  34 #include "cppbuiltin.h"
  35 #include "target.h"
  36
  37
  38 /* Parse a BASEVER version string of the format "major.minor.patchlevel"
  39    or "major.minor" to extract its components.  */
  40 void
  41 parse_basever (int *major, int *minor, int *patchlevel)
  42 {
  43   static int s_major = -1, s_minor, s_patchlevel;
  44
  45   if (s_major == -1)
  46     if (sscanf (BASEVER, "%d.%d.%d", &s_major, &s_minor, &s_patchlevel) != 3)
  47       {
  48         sscanf (BASEVER, "%d.%d", &s_major, &s_minor);
  49         s_patchlevel = 0;
  50       }
  51
  52   if (major)
  53     *major = s_major;
  54
  55   if (minor)
  56     *minor = s_minor;
  57
  58   if (patchlevel)
  59     *patchlevel = s_patchlevel;
  60 }
  61
  62
  63 /* Define __GNUC__, __GNUC_MINOR__, __GNUC_PATCHLEVEL__ and __VERSION__.  */
  64 static void
  65 define__GNUC__ (cpp_reader *pfile)
  66 {
  67   int major, minor, patchlevel;
  68
  69   parse_basever (&major, &minor, &patchlevel);
  70   cpp_define_formatted (pfile, "__GNUC__=%d", major);
  71   cpp_define_formatted (pfile, "__GNUC_MINOR__=%d", minor);
  72   cpp_define_formatted (pfile, "__GNUC_PATCHLEVEL__=%d", patchlevel);
  73   cpp_define_formatted (pfile, "__VERSION__=\"%s\"", version_string);
  74   cpp_define_formatted (pfile, "__ATOMIC_RELAXED=%d", MEMMODEL_RELAXED);
  75   cpp_define_formatted (pfile, "__ATOMIC_SEQ_CST=%d", MEMMODEL_SEQ_CST);
  76   cpp_define_formatted (pfile, "__ATOMIC_ACQUIRE=%d", MEMMODEL_ACQUIRE);
  77   cpp_define_formatted (pfile, "__ATOMIC_RELEASE=%d", MEMMODEL_RELEASE);
  78   cpp_define_formatted (pfile, "__ATOMIC_ACQ_REL=%d", MEMMODEL_ACQ_REL);
  79   cpp_define_formatted (pfile, "__ATOMIC_CONSUME=%d", MEMMODEL_CONSUME);
  80 }
  81
  82
  83 /* Define various built-in CPP macros that depend on language-independent
  84    compilation flags.  */
  85 static void
  86 define_builtin_macros_for_compilation_flags (cpp_reader *pfile)
  87 {
  88   if (flag_pic)
  89     {
  90       cpp_define_formatted (pfile, "__pic__=%d", flag_pic);
  91       cpp_define_formatted (pfile, "__PIC__=%d", flag_pic);
  92     }
  93   if (flag_pie)
  94     {
  95       cpp_define_formatted (pfile, "__pie__=%d", flag_pie);
  96       cpp_define_formatted (pfile, "__PIE__=%d", flag_pie);
  97     }
  98
  99   if (flag_sanitize & SANITIZE_ADDRESS)
 100     cpp_define (pfile, "__SANITIZE_ADDRESS__");
 101
 102   if (optimize_size)
 103     cpp_define (pfile, "__OPTIMIZE_SIZE__");
 104   if (optimize)
 105     cpp_define (pfile, "__OPTIMIZE__");
 106
 107   if (fast_math_flags_set_p (&global_options))
 108     cpp_define (pfile, "__FAST_MATH__");
 109   if (flag_signaling_nans)
 110     cpp_define (pfile, "__SUPPORT_SNAN__");
 111   if (!flag_errno_math)
 112     cpp_define (pfile, "__NO_MATH_ERRNO__");
 113
 114   cpp_define_formatted (pfile, "__FINITE_MATH_ONLY__=%d",
 115                         flag_finite_math_only);
 116   if (flag_cilkplus)
 117     cpp_define (pfile, "__cilk=200");
 118
 119   if (flag_check_pointer_bounds)
 120     cpp_define (pfile, "__CHKP__");
 121 }
 122
 123
 124 /* Define built-in macros for LP64 targets. */
 125 static void
 126 define_builtin_macros_for_lp64 (cpp_reader *pfile)
 127 {
 128   if (TYPE_PRECISION (long_integer_type_node) == 64
 129       && POINTER_SIZE == 64
 130       && TYPE_PRECISION (integer_type_node) == 32)
 131     {
 132       cpp_define (pfile, "_LP64");
 133       cpp_define (pfile, "__LP64__");
 134     }
 135 }
 136
 137
 138 /* Define macros for size of basic C types.  */
 139 static void
 140 define_builtin_macros_for_type_sizes (cpp_reader *pfile)
 141 {
 142 #define define_type_sizeof(NAME, TYPE)                             \
 143     cpp_define_formatted (pfile, NAME"=" HOST_WIDE_INT_PRINT_DEC,   \
 144                           tree_to_uhwi (TYPE_SIZE_UNIT (TYPE)))
 145
 146   define_type_sizeof ("__SIZEOF_INT__", integer_type_node);
 147   define_type_sizeof ("__SIZEOF_LONG__", long_integer_type_node);
 148   define_type_sizeof ("__SIZEOF_LONG_LONG__", long_long_integer_type_node);
 149   define_type_sizeof ("__SIZEOF_SHORT__", short_integer_type_node);
 150   define_type_sizeof ("__SIZEOF_FLOAT__", float_type_node);
 151   define_type_sizeof ("__SIZEOF_DOUBLE__", double_type_node);
 152   define_type_sizeof ("__SIZEOF_LONG_DOUBLE__", long_double_type_node);
 153   define_type_sizeof ("__SIZEOF_SIZE_T__", size_type_node);
 154
 155 #undef define_type_sizeof
 156
 157   cpp_define_formatted (pfile, "__CHAR_BIT__=%u",
 158                         TYPE_PRECISION (char_type_node));
 159   cpp_define_formatted (pfile, "__BIGGEST_ALIGNMENT__=%d",
 160                         BIGGEST_ALIGNMENT / BITS_PER_UNIT);
 161
 162   /* Define constants useful for implementing endian.h.  */
 163   cpp_define (pfile, "__ORDER_LITTLE_ENDIAN__=1234");
 164   cpp_define (pfile, "__ORDER_BIG_ENDIAN__=4321");
 165   cpp_define (pfile, "__ORDER_PDP_ENDIAN__=3412");
 166
 167   if (WORDS_BIG_ENDIAN == BYTES_BIG_ENDIAN)
 168     cpp_define_formatted (pfile, "__BYTE_ORDER__=%s",
 169                           (WORDS_BIG_ENDIAN
 170                            ? "__ORDER_BIG_ENDIAN__"
 171                            : "__ORDER_LITTLE_ENDIAN__"));
 172   else
 173     {
 174       /* Assert that we're only dealing with the PDP11 case.  */
 175       gcc_assert (!BYTES_BIG_ENDIAN);
 176       gcc_assert (WORDS_BIG_ENDIAN);
 177
 178       cpp_define (pfile, "__BYTE_ORDER__=__ORDER_PDP_ENDIAN__");
 179     }
 180
 181   cpp_define_formatted (pfile, "__FLOAT_WORD_ORDER__=%s",
 182                         (targetm.float_words_big_endian ()
 183                          ? "__ORDER_BIG_ENDIAN__"
 184                          : "__ORDER_LITTLE_ENDIAN__"));
 185
 186   /* ptr_type_node can't be used here since ptr_mode is only set when
 187      toplev calls backend_init which is not done with -E switch.  */
 188   cpp_define_formatted (pfile, "__SIZEOF_POINTER__=%d",
 189                         1 << ceil_log2 ((POINTER_SIZE + BITS_PER_UNIT - 1) / BITS_PER_UNIT));
 190 }
 191
 192
 193 /* Define macros builtins common to all language performing CPP
 194    preprocessing.  */
 195 void
 196 define_language_independent_builtin_macros (cpp_reader *pfile)
 197 {
 198   define__GNUC__ (pfile);
 199   define_builtin_macros_for_compilation_flags (pfile);
 200   define_builtin_macros_for_lp64 (pfile);
 201   define_builtin_macros_for_type_sizes (pfile);
 202 }