gcc/config/arm/arm-c.c

   1 /* Copyright (C) 2007-2017 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 #define IN_TARGET_CODE 1
  20
  21 #include "config.h"
  22 #include "system.h"
  23 #include "coretypes.h"
  24 #include "target.h"
  25 #include "c-family/c-common.h"
  26 #include "memmodel.h"
  27 #include "tm_p.h"
  28 #include "c-family/c-pragma.h"
  29 #include "stringpool.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   def_or_undef_macro (pfile, "__ARM_FEATURE_CRYPTO", TARGET_CRYPTO);
  72
  73   def_or_undef_macro (pfile, "__ARM_FEATURE_UNALIGNED", unaligned_access);
  74
  75   def_or_undef_macro (pfile, "__ARM_FEATURE_QRDMX", TARGET_NEON_RDMA);
  76
  77   def_or_undef_macro (pfile, "__ARM_FEATURE_CRC32", TARGET_CRC32);
  78   def_or_undef_macro (pfile, "__ARM_FEATURE_DOTPROD", TARGET_DOTPROD);
  79   def_or_undef_macro (pfile, "__ARM_32BIT_STATE", TARGET_32BIT);
  80
  81   cpp_undef (pfile, "__ARM_FEATURE_CMSE");
  82   if (arm_arch8 && !arm_arch_notm)
  83     {
  84       if (arm_arch_cmse && use_cmse)
  85         builtin_define_with_int_value ("__ARM_FEATURE_CMSE", 3);
  86       else
  87         builtin_define ("__ARM_FEATURE_CMSE");
  88     }
  89
  90   if (TARGET_ARM_FEATURE_LDREX)
  91     builtin_define_with_int_value ("__ARM_FEATURE_LDREX",
  92                                    TARGET_ARM_FEATURE_LDREX);
  93   else
  94     cpp_undef (pfile, "__ARM_FEATURE_LDREX");
  95
  96   def_or_undef_macro (pfile, "__ARM_FEATURE_CLZ",
  97                       ((TARGET_ARM_ARCH >= 5 && !TARGET_THUMB)
  98                        || TARGET_ARM_ARCH_ISA_THUMB >=2));
  99
 100   def_or_undef_macro (pfile, "__ARM_FEATURE_NUMERIC_MAXMIN",
 101                       TARGET_ARM_ARCH >= 8 && TARGET_NEON && TARGET_VFP5);
 102
 103   def_or_undef_macro (pfile, "__ARM_FEATURE_SIMD32", TARGET_INT_SIMD);
 104
 105   builtin_define_with_int_value ("__ARM_SIZEOF_MINIMAL_ENUM",
 106                                  flag_short_enums ? 1 : 4);
 107   builtin_define_type_sizeof ("__ARM_SIZEOF_WCHAR_T", wchar_type_node);
 108   if (TARGET_ARM_ARCH_PROFILE)
 109     builtin_define_with_int_value ("__ARM_ARCH_PROFILE",
 110                                    TARGET_ARM_ARCH_PROFILE);
 111
 112   /* Define __arm__ even when in thumb mode, for
 113      consistency with armcc.  */
 114   builtin_define ("__arm__");
 115   if (TARGET_ARM_ARCH)
 116     builtin_define_with_int_value ("__ARM_ARCH", TARGET_ARM_ARCH);
 117   if (arm_arch_notm)
 118     builtin_define ("__ARM_ARCH_ISA_ARM");
 119   builtin_define ("__APCS_32__");
 120
 121   def_or_undef_macro (pfile, "__thumb__", TARGET_THUMB);
 122   def_or_undef_macro (pfile, "__thumb2__", TARGET_THUMB2);
 123   if (TARGET_BIG_END)
 124     def_or_undef_macro (pfile, "__THUMBEB__", TARGET_THUMB);
 125   else
 126     def_or_undef_macro (pfile, "__THUMBEL__", TARGET_THUMB);
 127
 128   if (TARGET_ARM_ARCH_ISA_THUMB)
 129     builtin_define_with_int_value ("__ARM_ARCH_ISA_THUMB",
 130                                    TARGET_ARM_ARCH_ISA_THUMB);
 131
 132   if (TARGET_BIG_END)
 133     {
 134       builtin_define ("__ARMEB__");
 135       builtin_define ("__ARM_BIG_ENDIAN");
 136     }
 137   else
 138     {
 139       builtin_define ("__ARMEL__");
 140     }
 141
 142   if (TARGET_SOFT_FLOAT)
 143     builtin_define ("__SOFTFP__");
 144
 145   builtin_define ("__VFP_FP__");
 146
 147   if (TARGET_ARM_FP)
 148     builtin_define_with_int_value ("__ARM_FP", TARGET_ARM_FP);
 149   else
 150     cpp_undef (pfile, "__ARM_FP");
 151
 152   def_or_undef_macro (pfile, "__ARM_FP16_FORMAT_IEEE",
 153                       arm_fp16_format == ARM_FP16_FORMAT_IEEE);
 154   def_or_undef_macro (pfile, "__ARM_FP16_FORMAT_ALTERNATIVE",
 155                       arm_fp16_format == ARM_FP16_FORMAT_ALTERNATIVE);
 156   def_or_undef_macro (pfile, "__ARM_FP16_ARGS",
 157                       arm_fp16_format != ARM_FP16_FORMAT_NONE);
 158
 159   def_or_undef_macro (pfile, "__ARM_FEATURE_FP16_SCALAR_ARITHMETIC",
 160                       TARGET_VFP_FP16INST);
 161   def_or_undef_macro (pfile, "__ARM_FEATURE_FP16_VECTOR_ARITHMETIC",
 162                       TARGET_NEON_FP16INST);
 163
 164   def_or_undef_macro (pfile, "__ARM_FEATURE_FMA", TARGET_FMA);
 165   def_or_undef_macro (pfile, "__ARM_NEON__", TARGET_NEON);
 166   def_or_undef_macro (pfile, "__ARM_NEON", TARGET_NEON);
 167
 168   if (TARGET_NEON_FP)
 169     builtin_define_with_int_value ("__ARM_NEON_FP", TARGET_NEON_FP);
 170   else
 171     cpp_undef (pfile, "__ARM_NEON_FP");
 172
 173   /* Add a define for interworking. Needed when building libgcc.a.  */
 174   if (arm_cpp_interwork)
 175     builtin_define ("__THUMB_INTERWORK__");
 176
 177   builtin_define (arm_arch_name);
 178   if (arm_arch_xscale)
 179     builtin_define ("__XSCALE__");
 180   if (arm_arch_iwmmxt)
 181     {
 182       builtin_define ("__IWMMXT__");
 183       builtin_define ("__ARM_WMMX");
 184     }
 185   if (arm_arch_iwmmxt2)
 186     builtin_define ("__IWMMXT2__");
 187   /* ARMv6KZ was originally identified as the misspelled __ARM_ARCH_6ZK__.  To
 188      preserve the existing behavior, the misspelled feature macro must still be
 189      defined.  */
 190   if (arm_arch6kz)
 191     builtin_define ("__ARM_ARCH_6ZK__");
 192   if (TARGET_AAPCS_BASED)
 193     {
 194       if (arm_pcs_default == ARM_PCS_AAPCS_VFP)
 195         builtin_define ("__ARM_PCS_VFP");
 196       else if (arm_pcs_default == ARM_PCS_AAPCS)
 197         builtin_define ("__ARM_PCS");
 198       builtin_define ("__ARM_EABI__");
 199     }
 200
 201   def_or_undef_macro (pfile, "__ARM_ARCH_EXT_IDIV__", TARGET_IDIV);
 202   def_or_undef_macro (pfile, "__ARM_FEATURE_IDIV", TARGET_IDIV);
 203
 204   def_or_undef_macro (pfile, "__ARM_ASM_SYNTAX_UNIFIED__", inline_asm_unified);
 205
 206   if (TARGET_32BIT && arm_arch4 && !(arm_arch8 && arm_arch_notm))
 207     {
 208       int coproc_level = 0x1;
 209
 210       if (arm_arch5)
 211         coproc_level |= 0x2;
 212       if (arm_arch5e)
 213         coproc_level |= 0x4;
 214       if (arm_arch6)
 215         coproc_level |= 0x8;
 216
 217       builtin_define_with_int_value ("__ARM_FEATURE_COPROC", coproc_level);
 218     }
 219   else
 220       cpp_undef (pfile, "__ARM_FEATURE_COPROC");
 221 }
 222
 223 void
 224 arm_cpu_cpp_builtins (struct cpp_reader * pfile)
 225 {
 226   builtin_assert ("cpu=arm");
 227   builtin_assert ("machine=arm");
 228
 229   arm_cpu_builtins (pfile);
 230 }
 231
 232 /* Hook to validate the current #pragma GCC target and set the arch custom
 233    mode state.  If ARGS is NULL, then POP_TARGET is used to reset
 234    the options.  */
 235
 236 static bool
 237 arm_pragma_target_parse (tree args, tree pop_target)
 238 {
 239   tree prev_tree = target_option_current_node;
 240   tree cur_tree;
 241   struct cl_target_option *prev_opt;
 242   struct cl_target_option *cur_opt;
 243
 244   if (! args)
 245     {
 246       cur_tree = ((pop_target) ? pop_target : target_option_default_node);
 247       cl_target_option_restore (&global_options,
 248                                 TREE_TARGET_OPTION (cur_tree));
 249     }
 250   else
 251     {
 252       cur_tree = arm_valid_target_attribute_tree (args, &global_options,
 253                                                   &global_options_set);
 254       if (cur_tree == NULL_TREE)
 255         {
 256           cl_target_option_restore (&global_options,
 257                                     TREE_TARGET_OPTION (prev_tree));
 258           return false;
 259         }
 260
 261       /* handle_pragma_pop_options and handle_pragma_reset_options will set
 262        target_option_current_node, but not handle_pragma_target.  */
 263       target_option_current_node = cur_tree;
 264       arm_configure_build_target (&arm_active_target,
 265                                   TREE_TARGET_OPTION (cur_tree),
 266                                   &global_options_set, false);
 267     }
 268
 269   /* Update macros if target_node changes. The global state will be restored
 270      by arm_set_current_function.  */
 271   prev_opt = TREE_TARGET_OPTION (prev_tree);
 272   cur_opt  = TREE_TARGET_OPTION (cur_tree);
 273
 274   gcc_assert (prev_opt);
 275   gcc_assert (cur_opt);
 276
 277   if (cur_opt != prev_opt)
 278     {
 279       /* For the definitions, ensure all newly defined macros are considered
 280          as used for -Wunused-macros.  There is no point warning about the
 281          compiler predefined macros.  */
 282       cpp_options *cpp_opts = cpp_get_options (parse_in);
 283       unsigned char saved_warn_unused_macros = cpp_opts->warn_unused_macros;
 284
 285       cpp_opts->warn_unused_macros = 0;
 286
 287       /* Update macros.  */
 288       gcc_assert (cur_opt->x_target_flags == target_flags);
 289
 290       /* Don't warn for macros that have context sensitive values depending on
 291          other attributes.
 292          See warn_of_redefinition, reset after cpp_create_definition.  */
 293       tree acond_macro = get_identifier ("__ARM_NEON_FP");
 294       C_CPP_HASHNODE (acond_macro)->flags |= NODE_CONDITIONAL ;
 295
 296       acond_macro = get_identifier ("__ARM_FP");
 297       C_CPP_HASHNODE (acond_macro)->flags |= NODE_CONDITIONAL;
 298
 299       acond_macro = get_identifier ("__ARM_FEATURE_LDREX");
 300       C_CPP_HASHNODE (acond_macro)->flags |= NODE_CONDITIONAL;
 301
 302       arm_cpu_builtins (parse_in);
 303
 304       cpp_opts->warn_unused_macros = saved_warn_unused_macros;
 305
 306       /* Make sure that target_reinit is called for next function, since
 307          TREE_TARGET_OPTION might change with the #pragma even if there is
 308          no target attribute attached to the function.  */
 309       arm_reset_previous_fndecl ();
 310
 311       /* If going to the default mode, we restore the initial states.
 312          if cur_tree is a new target, states will be saved/restored on a per
 313          function basis in arm_set_current_function.  */
 314       if (cur_tree == target_option_default_node)
 315         save_restore_target_globals (cur_tree);
 316     }
 317
 318   return true;
 319 }
 320
 321 /* Register target pragmas.  We need to add the hook for parsing #pragma GCC
 322    option here rather than in arm.c since it will pull in various preprocessor
 323    functions, and those are not present in languages like fortran without a
 324    preprocessor.  */
 325
 326 void
 327 arm_register_target_pragmas (void)
 328 {
 329   /* Update pragma hook to allow parsing #pragma GCC target.  */
 330   targetm.target_option.pragma_parse = arm_pragma_target_parse;
 331
 332 #ifdef REGISTER_SUBTARGET_PRAGMAS
 333   REGISTER_SUBTARGET_PRAGMAS ();
 334 #endif
 335 }