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 "symtab.h"
  26 #include "tree.h"
  27 #include "tm_p.h"
  28 #include "c-family/c-common.h"
  29 #include "target.h"
  30 #include "target-def.h"
  31 #include "c-family/c-pragma.h"
  32
  33 /* Output C specific EABI object attributes.  These can not be done in
  34    arm.c because they require information from the C frontend.  */
  35
  36 static void
  37 arm_output_c_attributes (void)
  38 {
  39   int wchar_size = (int)(TYPE_PRECISION (wchar_type_node) / BITS_PER_UNIT);
  40   arm_emit_eabi_attribute ("Tag_ABI_PCS_wchar_t", 18, wchar_size);
  41 }
  42
  43
  44 /* Setup so that common code calls arm_output_c_attributes.  */
  45
  46 void
  47 arm_lang_object_attributes_init (void)
  48 {
  49   arm_lang_output_object_attributes_hook = arm_output_c_attributes;
  50 }
  51
  52 #define builtin_define(TXT) cpp_define (pfile, TXT)
  53 #define builtin_assert(TXT) cpp_assert (pfile, TXT)
  54
  55 /* Define or undefine macros based on the current target.  If the user does
  56    #pragma GCC target, we need to adjust the macros dynamically.  */
  57
  58 static void
  59 def_or_undef_macro(struct cpp_reader* pfile, const char *name, bool def_p)
  60 {
  61   if (def_p)
  62     cpp_define (pfile, name);
  63   else
  64     cpp_undef (pfile, name);
  65 }
  66
  67 void
  68 arm_cpu_builtins (struct cpp_reader* pfile, int flags)
  69 {
  70   def_or_undef_macro (pfile, "__ARM_FEATURE_DSP",
  71                       TARGET_DSP_MULTIPLY_P (flags));
  72   def_or_undef_macro (pfile, "__ARM_FEATURE_QBIT",
  73                       TARGET_ARM_QBIT_P (flags));
  74   def_or_undef_macro (pfile, "__ARM_FEATURE_SAT",
  75                       TARGET_ARM_SAT_P (flags));
  76   if (TARGET_CRYPTO)
  77     builtin_define ("__ARM_FEATURE_CRYPTO");
  78   if (unaligned_access)
  79     builtin_define ("__ARM_FEATURE_UNALIGNED");
  80   if (TARGET_CRC32)
  81     builtin_define ("__ARM_FEATURE_CRC32");
  82
  83   def_or_undef_macro (pfile, "__ARM_32BIT_STATE", TARGET_32BIT_P (flags));
  84
  85   if (TARGET_ARM_FEATURE_LDREX_P (flags))
  86     builtin_define_with_int_value ("__ARM_FEATURE_LDREX",
  87                                    TARGET_ARM_FEATURE_LDREX_P (flags));
  88   else
  89     cpp_undef (pfile, "__ARM_FEATURE_LDREX");
  90
  91   def_or_undef_macro (pfile, "__ARM_FEATURE_CLZ",
  92                       ((TARGET_ARM_ARCH >= 5 && !TARGET_THUMB_P (flags))
  93                        || TARGET_ARM_ARCH_ISA_THUMB >=2));
  94
  95   def_or_undef_macro (pfile, "__ARM_FEATURE_SIMD32", TARGET_INT_SIMD_P (flags));
  96
  97   builtin_define_with_int_value ("__ARM_SIZEOF_MINIMAL_ENUM",
  98                                  flag_short_enums ? 1 : 4);
  99   builtin_define_type_sizeof ("__ARM_SIZEOF_WCHAR_T", wchar_type_node);
 100   if (TARGET_ARM_ARCH_PROFILE)
 101     builtin_define_with_int_value ("__ARM_ARCH_PROFILE",
 102                                    TARGET_ARM_ARCH_PROFILE);
 103
 104   /* Define __arm__ even when in thumb mode, for
 105      consistency with armcc.  */
 106   builtin_define ("__arm__");
 107   if (TARGET_ARM_ARCH)
 108     builtin_define_with_int_value ("__ARM_ARCH", TARGET_ARM_ARCH);
 109   if (arm_arch_notm)
 110     builtin_define ("__ARM_ARCH_ISA_ARM");
 111   builtin_define ("__APCS_32__");
 112
 113   def_or_undef_macro (pfile, "__thumb__", TARGET_THUMB_P (flags));
 114   def_or_undef_macro (pfile, "__thumb2__", TARGET_THUMB2_P (flags));
 115   if (TARGET_BIG_END)
 116     def_or_undef_macro (pfile, "__THUMBEB__", TARGET_THUMB_P (flags));
 117   else
 118     def_or_undef_macro (pfile, "__THUMBEL__", TARGET_THUMB_P (flags));
 119
 120   if (TARGET_ARM_ARCH_ISA_THUMB)
 121     builtin_define_with_int_value ("__ARM_ARCH_ISA_THUMB",
 122                                    TARGET_ARM_ARCH_ISA_THUMB);
 123
 124   if (TARGET_BIG_END)
 125     {
 126       builtin_define ("__ARMEB__");
 127       builtin_define ("__ARM_BIG_ENDIAN");
 128     }
 129   else
 130     {
 131       builtin_define ("__ARMEL__");
 132     }
 133
 134   if (TARGET_SOFT_FLOAT)
 135     builtin_define ("__SOFTFP__");
 136
 137   if (TARGET_VFP)
 138     builtin_define ("__VFP_FP__");
 139
 140   if (TARGET_ARM_FP)
 141     builtin_define_with_int_value ("__ARM_FP", TARGET_ARM_FP);
 142   if (arm_fp16_format == ARM_FP16_FORMAT_IEEE)
 143     builtin_define ("__ARM_FP16_FORMAT_IEEE");
 144   if (arm_fp16_format == ARM_FP16_FORMAT_ALTERNATIVE)
 145     builtin_define ("__ARM_FP16_FORMAT_ALTERNATIVE");
 146   if (TARGET_FMA)
 147     builtin_define ("__ARM_FEATURE_FMA");
 148
 149   if (TARGET_NEON)
 150     {
 151       builtin_define ("__ARM_NEON__");
 152       builtin_define ("__ARM_NEON");
 153     }
 154   if (TARGET_NEON_FP)
 155     builtin_define_with_int_value ("__ARM_NEON_FP", TARGET_NEON_FP);
 156
 157   /* Add a define for interworking. Needed when building libgcc.a.  */
 158   if (arm_cpp_interwork)
 159     builtin_define ("__THUMB_INTERWORK__");
 160
 161
 162   builtin_define (arm_arch_name);
 163   if (arm_arch_xscale)
 164     builtin_define ("__XSCALE__");
 165   if (arm_arch_iwmmxt)
 166     {
 167       builtin_define ("__IWMMXT__");
 168       builtin_define ("__ARM_WMMX");
 169     }
 170   if (arm_arch_iwmmxt2)
 171     builtin_define ("__IWMMXT2__");
 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_P (flags));
 182   def_or_undef_macro (pfile, "__ARM_FEATURE_IDIV", TARGET_IDIV_P (flags));
 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, target_flags);
 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       arm_cpu_builtins (parse_in, cur_opt->x_target_flags);
 246
 247       cpp_opts->warn_unused_macros = saved_warn_unused_macros;
 248     }
 249
 250   return true;
 251 }
 252
 253 /* Register target pragmas.  We need to add the hook for parsing #pragma GCC
 254    option here rather than in arm.c since it will pull in various preprocessor
 255    functions, and those are not present in languages like fortran without a
 256    preprocessor.  */
 257
 258 void
 259 arm_register_target_pragmas (void)
 260 {
 261   /* Update pragma hook to allow parsing #pragma GCC target.  */
 262   targetm.target_option.pragma_parse = arm_pragma_target_parse;
 263
 264 #ifdef REGISTER_SUBTARGET_PRAGMAS
 265   REGISTER_SUBTARGET_PRAGMAS ();
 266 #endif
 267 }