gcc/config/arm/arm-c.c

   1 /* Copyright (C) 2007-2015 Free Software Foundation, Inc.
   2
   3    This file is part of GCC.
   4
   5    GCC is free software; you can redistribute it and/or modify it under
   6    the terms of the GNU General Public License as published by the Free
   7    Software Foundation; either version 3, or (at your option) any later
   8    version.
   9
  10    GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  11    WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  13    for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with GCC; see the file COPYING3.  If not see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include "config.h"
  20 #include "system.h"
  21 #include "coretypes.h"
  22 #include "tm.h"
  23 #include "tm_p.h"
  24 #include "alias.h"
  25 #include "tree.h"
  26 #include "tm_p.h"
  27 #include "c-family/c-common.h"
  28 #include "target.h"
  29 #include "c-family/c-pragma.h"
  30
  31 /* Output C specific EABI object attributes.  These can not be done in
  32    arm.c because they require information from the C frontend.  */
  33
  34 static void
  35 arm_output_c_attributes (void)
  36 {
  37   int wchar_size = (int)(TYPE_PRECISION (wchar_type_node) / BITS_PER_UNIT);
  38   arm_emit_eabi_attribute ("Tag_ABI_PCS_wchar_t", 18, wchar_size);
  39 }
  40
  41
  42 /* Setup so that common code calls arm_output_c_attributes.  */
  43
  44 void
  45 arm_lang_object_attributes_init (void)
  46 {
  47   arm_lang_output_object_attributes_hook = arm_output_c_attributes;
  48 }
  49
  50 #define builtin_define(TXT) cpp_define (pfile, TXT)
  51 #define builtin_assert(TXT) cpp_assert (pfile, TXT)
  52
  53 /* Define or undefine macros based on the current target.  If the user does
  54    #pragma GCC target, we need to adjust the macros dynamically.  */
  55
  56 static void
  57 def_or_undef_macro(struct cpp_reader* pfile, const char *name, bool def_p)
  58 {
  59   if (def_p)
  60     cpp_define (pfile, name);
  61   else
  62     cpp_undef (pfile, name);
  63 }
  64
  65 static void
  66 arm_cpu_builtins (struct cpp_reader* pfile)
  67 {
  68   def_or_undef_macro (pfile, "__ARM_FEATURE_DSP", TARGET_DSP_MULTIPLY);
  69   def_or_undef_macro (pfile, "__ARM_FEATURE_QBIT", TARGET_ARM_QBIT);
  70   def_or_undef_macro (pfile, "__ARM_FEATURE_SAT", TARGET_ARM_SAT);
  71   if (TARGET_CRYPTO)
  72     builtin_define ("__ARM_FEATURE_CRYPTO");
  73   if (unaligned_access)
  74     builtin_define ("__ARM_FEATURE_UNALIGNED");
  75   if (TARGET_CRC32)
  76     builtin_define ("__ARM_FEATURE_CRC32");
  77
  78   def_or_undef_macro (pfile, "__ARM_32BIT_STATE", TARGET_32BIT);
  79
  80   if (TARGET_ARM_FEATURE_LDREX)
  81     builtin_define_with_int_value ("__ARM_FEATURE_LDREX",
  82                                    TARGET_ARM_FEATURE_LDREX);
  83   else
  84     cpp_undef (pfile, "__ARM_FEATURE_LDREX");
  85
  86   def_or_undef_macro (pfile, "__ARM_FEATURE_CLZ",
  87                       ((TARGET_ARM_ARCH >= 5 && !TARGET_THUMB)
  88                        || TARGET_ARM_ARCH_ISA_THUMB >=2));
  89
  90   def_or_undef_macro (pfile, "__ARM_FEATURE_SIMD32", TARGET_INT_SIMD);
  91
  92   builtin_define_with_int_value ("__ARM_SIZEOF_MINIMAL_ENUM",
  93                                  flag_short_enums ? 1 : 4);
  94   builtin_define_type_sizeof ("__ARM_SIZEOF_WCHAR_T", wchar_type_node);
  95   if (TARGET_ARM_ARCH_PROFILE)
  96     builtin_define_with_int_value ("__ARM_ARCH_PROFILE",
  97                                    TARGET_ARM_ARCH_PROFILE);
  98
  99   /* Define __arm__ even when in thumb mode, for
 100      consistency with armcc.  */
 101   builtin_define ("__arm__");
 102   if (TARGET_ARM_ARCH)
 103     builtin_define_with_int_value ("__ARM_ARCH", TARGET_ARM_ARCH);
 104   if (arm_arch_notm)
 105     builtin_define ("__ARM_ARCH_ISA_ARM");
 106   builtin_define ("__APCS_32__");
 107
 108   def_or_undef_macro (pfile, "__thumb__", TARGET_THUMB);
 109   def_or_undef_macro (pfile, "__thumb2__", TARGET_THUMB2);
 110   if (TARGET_BIG_END)
 111     def_or_undef_macro (pfile, "__THUMBEB__", TARGET_THUMB);
 112   else
 113     def_or_undef_macro (pfile, "__THUMBEL__", TARGET_THUMB);
 114
 115   if (TARGET_ARM_ARCH_ISA_THUMB)
 116     builtin_define_with_int_value ("__ARM_ARCH_ISA_THUMB",
 117                                    TARGET_ARM_ARCH_ISA_THUMB);
 118
 119   if (TARGET_BIG_END)
 120     {
 121       builtin_define ("__ARMEB__");
 122       builtin_define ("__ARM_BIG_ENDIAN");
 123     }
 124   else
 125     {
 126       builtin_define ("__ARMEL__");
 127     }
 128
 129   if (TARGET_SOFT_FLOAT)
 130     builtin_define ("__SOFTFP__");
 131
 132   if (TARGET_VFP)
 133     builtin_define ("__VFP_FP__");
 134
 135   if (TARGET_ARM_FP)
 136     builtin_define_with_int_value ("__ARM_FP", TARGET_ARM_FP);
 137   if (arm_fp16_format == ARM_FP16_FORMAT_IEEE)
 138     builtin_define ("__ARM_FP16_FORMAT_IEEE");
 139   if (arm_fp16_format == ARM_FP16_FORMAT_ALTERNATIVE)
 140     builtin_define ("__ARM_FP16_FORMAT_ALTERNATIVE");
 141   if (TARGET_FMA)
 142     builtin_define ("__ARM_FEATURE_FMA");
 143
 144   if (TARGET_NEON)
 145     {
 146       builtin_define ("__ARM_NEON__");
 147       builtin_define ("__ARM_NEON");
 148     }
 149   if (TARGET_NEON_FP)
 150     builtin_define_with_int_value ("__ARM_NEON_FP", TARGET_NEON_FP);
 151
 152   /* Add a define for interworking. Needed when building libgcc.a.  */
 153   if (arm_cpp_interwork)
 154     builtin_define ("__THUMB_INTERWORK__");
 155
 156
 157   builtin_define (arm_arch_name);
 158   if (arm_arch_xscale)
 159     builtin_define ("__XSCALE__");
 160   if (arm_arch_iwmmxt)
 161     {
 162       builtin_define ("__IWMMXT__");
 163       builtin_define ("__ARM_WMMX");
 164     }
 165   if (arm_arch_iwmmxt2)
 166     builtin_define ("__IWMMXT2__");
 167   /* ARMv6KZ was originally identified as the misspelled __ARM_ARCH_6ZK__.  To
 168      preserve the existing behaviour, the misspelled feature macro must still be
 169      defined.  */
 170   if (arm_arch6kz)
 171     builtin_define ("__ARM_ARCH_6ZK__");
 172   if (TARGET_AAPCS_BASED)
 173     {
 174       if (arm_pcs_default == ARM_PCS_AAPCS_VFP)
 175         builtin_define ("__ARM_PCS_VFP");
 176       else if (arm_pcs_default == ARM_PCS_AAPCS)
 177         builtin_define ("__ARM_PCS");
 178       builtin_define ("__ARM_EABI__");
 179     }
 180
 181   def_or_undef_macro (pfile, "__ARM_ARCH_EXT_IDIV__", TARGET_IDIV);
 182   def_or_undef_macro (pfile, "__ARM_FEATURE_IDIV", TARGET_IDIV);
 183
 184   def_or_undef_macro (pfile, "__ARM_ASM_SYNTAX_UNIFIED__", inline_asm_unified);
 185 }
 186
 187 void
 188 arm_cpu_cpp_builtins (struct cpp_reader * pfile)
 189 {
 190   builtin_assert ("cpu=arm");
 191   builtin_assert ("machine=arm");
 192
 193   arm_cpu_builtins (pfile);
 194 }
 195
 196 /* Hook to validate the current #pragma GCC target and set the arch custom
 197    mode state.  If ARGS is NULL, then POP_TARGET is used to reset
 198    the options.  */
 199 static bool
 200 arm_pragma_target_parse (tree args, tree pop_target)
 201 {
 202   tree prev_tree = build_target_option_node (&global_options);
 203   tree cur_tree;
 204   struct cl_target_option *prev_opt;
 205   struct cl_target_option *cur_opt;
 206
 207   if (! args)
 208     {
 209       cur_tree = ((pop_target) ? pop_target : target_option_default_node);
 210       cl_target_option_restore (&global_options,
 211                                 TREE_TARGET_OPTION (cur_tree));
 212     }
 213   else
 214     {
 215       cur_tree = arm_valid_target_attribute_tree (args, &global_options,
 216                                                   &global_options_set);
 217       if (cur_tree == NULL_TREE)
 218         {
 219           cl_target_option_restore (&global_options,
 220                                     TREE_TARGET_OPTION (prev_tree));
 221           return false;
 222         }
 223     }
 224
 225   target_option_current_node = cur_tree;
 226   arm_reset_previous_fndecl ();
 227
 228   /* Figure out the previous mode.  */
 229   prev_opt  = TREE_TARGET_OPTION (prev_tree);
 230   cur_opt   = TREE_TARGET_OPTION (cur_tree);
 231
 232   gcc_assert (prev_opt);
 233   gcc_assert (cur_opt);
 234
 235   if (cur_opt->x_target_flags != prev_opt->x_target_flags)
 236     {
 237       /* For the definitions, ensure all newly defined macros are considered
 238          as used for -Wunused-macros.  There is no point warning about the
 239          compiler predefined macros.  */
 240       cpp_options *cpp_opts = cpp_get_options (parse_in);
 241       unsigned char saved_warn_unused_macros = cpp_opts->warn_unused_macros;
 242       cpp_opts->warn_unused_macros = 0;
 243
 244       /* Update macros.  */
 245       gcc_assert (cur_opt->x_target_flags == target_flags);
 246       arm_cpu_builtins (parse_in);
 247
 248       cpp_opts->warn_unused_macros = saved_warn_unused_macros;
 249     }
 250
 251   return true;
 252 }
 253
 254 /* Register target pragmas.  We need to add the hook for parsing #pragma GCC
 255    option here rather than in arm.c since it will pull in various preprocessor
 256    functions, and those are not present in languages like fortran without a
 257    preprocessor.  */
 258
 259 void
 260 arm_register_target_pragmas (void)
 261 {
 262   /* Update pragma hook to allow parsing #pragma GCC target.  */
 263   targetm.target_option.pragma_parse = arm_pragma_target_parse;
 264
 265 #ifdef REGISTER_SUBTARGET_PRAGMAS
 266   REGISTER_SUBTARGET_PRAGMAS ();
 267 #endif
 268 }