gcc/config/arm/arm-c.c

   1 /* Copyright (C) 2007-2016 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 "target.h"
  23 #include "c-family/c-common.h"
  24 #include "memmodel.h"
  25 #include "tm_p.h"
  26 #include "c-family/c-pragma.h"
  27 #include "stringpool.h"
  28
  29 /* Output C specific EABI object attributes.  These can not be done in
  30    arm.c because they require information from the C frontend.  */
  31
  32 static void
  33 arm_output_c_attributes (void)
  34 {
  35   int wchar_size = (int)(TYPE_PRECISION (wchar_type_node) / BITS_PER_UNIT);
  36   arm_emit_eabi_attribute ("Tag_ABI_PCS_wchar_t", 18, wchar_size);
  37 }
  38
  39
  40 /* Setup so that common code calls arm_output_c_attributes.  */
  41
  42 void
  43 arm_lang_object_attributes_init (void)
  44 {
  45   arm_lang_output_object_attributes_hook = arm_output_c_attributes;
  46 }
  47
  48 #define builtin_define(TXT) cpp_define (pfile, TXT)
  49 #define builtin_assert(TXT) cpp_assert (pfile, TXT)
  50
  51 /* Define or undefine macros based on the current target.  If the user does
  52    #pragma GCC target, we need to adjust the macros dynamically.  */
  53
  54 static void
  55 def_or_undef_macro(struct cpp_reader* pfile, const char *name, bool def_p)
  56 {
  57   if (def_p)
  58     cpp_define (pfile, name);
  59   else
  60     cpp_undef (pfile, name);
  61 }
  62
  63 static void
  64 arm_cpu_builtins (struct cpp_reader* pfile)
  65 {
  66   def_or_undef_macro (pfile, "__ARM_FEATURE_DSP", TARGET_DSP_MULTIPLY);
  67   def_or_undef_macro (pfile, "__ARM_FEATURE_QBIT", TARGET_ARM_QBIT);
  68   def_or_undef_macro (pfile, "__ARM_FEATURE_SAT", TARGET_ARM_SAT);
  69   def_or_undef_macro (pfile, "__ARM_FEATURE_CRYPTO", TARGET_CRYPTO);
  70
  71   def_or_undef_macro (pfile, "__ARM_FEATURE_UNALIGNED", unaligned_access);
  72
  73   def_or_undef_macro (pfile, "__ARM_FEATURE_QRDMX", TARGET_NEON_RDMA);
  74
  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_NUMERIC_MAXMIN",
  91                       TARGET_ARM_ARCH >= 8 && TARGET_NEON && TARGET_FPU_ARMV8);
  92
  93   def_or_undef_macro (pfile, "__ARM_FEATURE_SIMD32", TARGET_INT_SIMD);
  94
  95   builtin_define_with_int_value ("__ARM_SIZEOF_MINIMAL_ENUM",
  96                                  flag_short_enums ? 1 : 4);
  97   builtin_define_type_sizeof ("__ARM_SIZEOF_WCHAR_T", wchar_type_node);
  98   if (TARGET_ARM_ARCH_PROFILE)
  99     builtin_define_with_int_value ("__ARM_ARCH_PROFILE",
 100                                    TARGET_ARM_ARCH_PROFILE);
 101
 102   /* Define __arm__ even when in thumb mode, for
 103      consistency with armcc.  */
 104   builtin_define ("__arm__");
 105   if (TARGET_ARM_ARCH)
 106     builtin_define_with_int_value ("__ARM_ARCH", TARGET_ARM_ARCH);
 107   if (arm_arch_notm)
 108     builtin_define ("__ARM_ARCH_ISA_ARM");
 109   builtin_define ("__APCS_32__");
 110
 111   def_or_undef_macro (pfile, "__thumb__", TARGET_THUMB);
 112   def_or_undef_macro (pfile, "__thumb2__", TARGET_THUMB2);
 113   if (TARGET_BIG_END)
 114     def_or_undef_macro (pfile, "__THUMBEB__", TARGET_THUMB);
 115   else
 116     def_or_undef_macro (pfile, "__THUMBEL__", TARGET_THUMB);
 117
 118   if (TARGET_ARM_ARCH_ISA_THUMB)
 119     builtin_define_with_int_value ("__ARM_ARCH_ISA_THUMB",
 120                                    TARGET_ARM_ARCH_ISA_THUMB);
 121
 122   if (TARGET_BIG_END)
 123     {
 124       builtin_define ("__ARMEB__");
 125       builtin_define ("__ARM_BIG_ENDIAN");
 126     }
 127   else
 128     {
 129       builtin_define ("__ARMEL__");
 130     }
 131
 132   if (TARGET_SOFT_FLOAT)
 133     builtin_define ("__SOFTFP__");
 134
 135   builtin_define ("__VFP_FP__");
 136
 137   if (TARGET_ARM_FP)
 138     builtin_define_with_int_value ("__ARM_FP", TARGET_ARM_FP);
 139   else
 140     cpp_undef (pfile, "__ARM_FP");
 141
 142   def_or_undef_macro (pfile, "__ARM_FP16_FORMAT_IEEE",
 143                       arm_fp16_format == ARM_FP16_FORMAT_IEEE);
 144   def_or_undef_macro (pfile, "__ARM_FP16_FORMAT_ALTERNATIVE",
 145                       arm_fp16_format == ARM_FP16_FORMAT_ALTERNATIVE);
 146   def_or_undef_macro (pfile, "__ARM_FP16_ARGS",
 147                       arm_fp16_format != ARM_FP16_FORMAT_NONE);
 148
 149   def_or_undef_macro (pfile, "__ARM_FEATURE_FP16_SCALAR_ARITHMETIC",
 150                       TARGET_VFP_FP16INST);
 151   def_or_undef_macro (pfile, "__ARM_FEATURE_FP16_VECTOR_ARITHMETIC",
 152                       TARGET_NEON_FP16INST);
 153
 154   def_or_undef_macro (pfile, "__ARM_FEATURE_FMA", TARGET_FMA);
 155   def_or_undef_macro (pfile, "__ARM_NEON__", TARGET_NEON);
 156   def_or_undef_macro (pfile, "__ARM_NEON", TARGET_NEON);
 157
 158   if (TARGET_NEON_FP)
 159     builtin_define_with_int_value ("__ARM_NEON_FP", TARGET_NEON_FP);
 160   else
 161     cpp_undef (pfile, "__ARM_NEON_FP");
 162
 163   /* Add a define for interworking. Needed when building libgcc.a.  */
 164   if (arm_cpp_interwork)
 165     builtin_define ("__THUMB_INTERWORK__");
 166
 167   builtin_define (arm_arch_name);
 168   if (arm_arch_xscale)
 169     builtin_define ("__XSCALE__");
 170   if (arm_arch_iwmmxt)
 171     {
 172       builtin_define ("__IWMMXT__");
 173       builtin_define ("__ARM_WMMX");
 174     }
 175   if (arm_arch_iwmmxt2)
 176     builtin_define ("__IWMMXT2__");
 177   /* ARMv6KZ was originally identified as the misspelled __ARM_ARCH_6ZK__.  To
 178      preserve the existing behavior, the misspelled feature macro must still be
 179      defined.  */
 180   if (arm_arch6kz)
 181     builtin_define ("__ARM_ARCH_6ZK__");
 182   if (TARGET_AAPCS_BASED)
 183     {
 184       if (arm_pcs_default == ARM_PCS_AAPCS_VFP)
 185         builtin_define ("__ARM_PCS_VFP");
 186       else if (arm_pcs_default == ARM_PCS_AAPCS)
 187         builtin_define ("__ARM_PCS");
 188       builtin_define ("__ARM_EABI__");
 189     }
 190
 191   def_or_undef_macro (pfile, "__ARM_ARCH_EXT_IDIV__", TARGET_IDIV);
 192   def_or_undef_macro (pfile, "__ARM_FEATURE_IDIV", TARGET_IDIV);
 193
 194   def_or_undef_macro (pfile, "__ARM_ASM_SYNTAX_UNIFIED__", inline_asm_unified);
 195 }
 196
 197 void
 198 arm_cpu_cpp_builtins (struct cpp_reader * pfile)
 199 {
 200   builtin_assert ("cpu=arm");
 201   builtin_assert ("machine=arm");
 202
 203   arm_cpu_builtins (pfile);
 204 }
 205
 206 /* Hook to validate the current #pragma GCC target and set the arch custom
 207    mode state.  If ARGS is NULL, then POP_TARGET is used to reset
 208    the options.  */
 209
 210 static bool
 211 arm_pragma_target_parse (tree args, tree pop_target)
 212 {
 213   tree prev_tree = target_option_current_node;
 214   tree cur_tree;
 215   struct cl_target_option *prev_opt;
 216   struct cl_target_option *cur_opt;
 217
 218   if (! args)
 219     {
 220       cur_tree = ((pop_target) ? pop_target : target_option_default_node);
 221       cl_target_option_restore (&global_options,
 222                                 TREE_TARGET_OPTION (cur_tree));
 223     }
 224   else
 225     {
 226       cur_tree = arm_valid_target_attribute_tree (args, &global_options,
 227                                                   &global_options_set);
 228       if (cur_tree == NULL_TREE)
 229         {
 230           cl_target_option_restore (&global_options,
 231                                     TREE_TARGET_OPTION (prev_tree));
 232           return false;
 233         }
 234
 235       /* handle_pragma_pop_options and handle_pragma_reset_options will set
 236        target_option_current_node, but not handle_pragma_target.  */
 237       target_option_current_node = cur_tree;
 238     }
 239
 240   /* Update macros if target_node changes. The global state will be restored
 241      by arm_set_current_function.  */
 242   prev_opt = TREE_TARGET_OPTION (prev_tree);
 243   cur_opt  = TREE_TARGET_OPTION (cur_tree);
 244
 245   gcc_assert (prev_opt);
 246   gcc_assert (cur_opt);
 247
 248   if (cur_opt != prev_opt)
 249     {
 250       /* For the definitions, ensure all newly defined macros are considered
 251          as used for -Wunused-macros.  There is no point warning about the
 252          compiler predefined macros.  */
 253       cpp_options *cpp_opts = cpp_get_options (parse_in);
 254       unsigned char saved_warn_unused_macros = cpp_opts->warn_unused_macros;
 255
 256       cpp_opts->warn_unused_macros = 0;
 257
 258       /* Update macros.  */
 259       gcc_assert (cur_opt->x_target_flags == target_flags);
 260
 261       /* Don't warn for macros that have context sensitive values depending on
 262          other attributes.
 263          See warn_of_redefinition, reset after cpp_create_definition.  */
 264       tree acond_macro = get_identifier ("__ARM_NEON_FP");
 265       C_CPP_HASHNODE (acond_macro)->flags |= NODE_CONDITIONAL ;
 266
 267       acond_macro = get_identifier ("__ARM_FP");
 268       C_CPP_HASHNODE (acond_macro)->flags |= NODE_CONDITIONAL;
 269
 270       acond_macro = get_identifier ("__ARM_FEATURE_LDREX");
 271       C_CPP_HASHNODE (acond_macro)->flags |= NODE_CONDITIONAL;
 272
 273       arm_cpu_builtins (parse_in);
 274
 275       cpp_opts->warn_unused_macros = saved_warn_unused_macros;
 276
 277       /* Make sure that target_reinit is called for next function, since
 278          TREE_TARGET_OPTION might change with the #pragma even if there is
 279          no target attribute attached to the function.  */
 280       arm_reset_previous_fndecl ();
 281
 282       /* If going to the default mode, we restore the initial states.
 283          if cur_tree is a new target, states will be saved/restored on a per
 284          function basis in arm_set_current_function.  */
 285       if (cur_tree == target_option_default_node)
 286         save_restore_target_globals (cur_tree);
 287     }
 288
 289   return true;
 290 }
 291
 292 /* Register target pragmas.  We need to add the hook for parsing #pragma GCC
 293    option here rather than in arm.c since it will pull in various preprocessor
 294    functions, and those are not present in languages like fortran without a
 295    preprocessor.  */
 296
 297 void
 298 arm_register_target_pragmas (void)
 299 {
 300   /* Update pragma hook to allow parsing #pragma GCC target.  */
 301   targetm.target_option.pragma_parse = arm_pragma_target_parse;
 302
 303 #ifdef REGISTER_SUBTARGET_PRAGMAS
 304   REGISTER_SUBTARGET_PRAGMAS ();
 305 #endif
 306 }