gcc/config/arm/arm-c.c

   1 /* Copyright (C) 2007-2019 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   cpp_undef (pfile, "__ARM_FEATURE_LDREX");
  91   if (TARGET_ARM_FEATURE_LDREX)
  92     builtin_define_with_int_value ("__ARM_FEATURE_LDREX",
  93                                    TARGET_ARM_FEATURE_LDREX);
  94
  95   def_or_undef_macro (pfile, "__ARM_FEATURE_CLZ",
  96                       ((TARGET_ARM_ARCH >= 5 && !TARGET_THUMB)
  97                        || TARGET_ARM_ARCH_ISA_THUMB >=2));
  98
  99   def_or_undef_macro (pfile, "__ARM_FEATURE_NUMERIC_MAXMIN",
 100                       TARGET_ARM_ARCH >= 8 && TARGET_NEON && TARGET_VFP5);
 101
 102   def_or_undef_macro (pfile, "__ARM_FEATURE_SIMD32", TARGET_INT_SIMD);
 103
 104   builtin_define_with_int_value ("__ARM_SIZEOF_MINIMAL_ENUM",
 105                                  flag_short_enums ? 1 : 4);
 106   builtin_define_type_sizeof ("__ARM_SIZEOF_WCHAR_T", wchar_type_node);
 107
 108   cpp_undef (pfile, "__ARM_ARCH_PROFILE");
 109   if (TARGET_ARM_ARCH_PROFILE)
 110     builtin_define_with_int_value ("__ARM_ARCH_PROFILE",
 111                                    TARGET_ARM_ARCH_PROFILE);
 112
 113   /* Define __arm__ even when in thumb mode, for
 114      consistency with armcc.  */
 115   builtin_define ("__arm__");
 116   if (TARGET_ARM_ARCH)
 117     {
 118       cpp_undef (pfile, "__ARM_ARCH");
 119       builtin_define_with_int_value ("__ARM_ARCH", TARGET_ARM_ARCH);
 120     }
 121   if (arm_arch_notm)
 122     builtin_define ("__ARM_ARCH_ISA_ARM");
 123   builtin_define ("__APCS_32__");
 124
 125   def_or_undef_macro (pfile, "__thumb__", TARGET_THUMB);
 126   def_or_undef_macro (pfile, "__thumb2__", TARGET_THUMB2);
 127   if (TARGET_BIG_END)
 128     def_or_undef_macro (pfile, "__THUMBEB__", TARGET_THUMB);
 129   else
 130     def_or_undef_macro (pfile, "__THUMBEL__", TARGET_THUMB);
 131
 132   cpp_undef (pfile, "__ARM_ARCH_ISA_THUMB");
 133   if (TARGET_ARM_ARCH_ISA_THUMB)
 134     builtin_define_with_int_value ("__ARM_ARCH_ISA_THUMB",
 135                                    TARGET_ARM_ARCH_ISA_THUMB);
 136
 137   if (TARGET_BIG_END)
 138     {
 139       builtin_define ("__ARMEB__");
 140       builtin_define ("__ARM_BIG_ENDIAN");
 141     }
 142   else
 143     {
 144       builtin_define ("__ARMEL__");
 145     }
 146
 147   if (TARGET_SOFT_FLOAT)
 148     builtin_define ("__SOFTFP__");
 149
 150   builtin_define ("__VFP_FP__");
 151
 152   cpp_undef (pfile, "__ARM_FP");
 153   if (TARGET_ARM_FP)
 154     builtin_define_with_int_value ("__ARM_FP", TARGET_ARM_FP);
 155
 156   def_or_undef_macro (pfile, "__ARM_FP16_FORMAT_IEEE",
 157                       arm_fp16_format == ARM_FP16_FORMAT_IEEE);
 158   def_or_undef_macro (pfile, "__ARM_FP16_FORMAT_ALTERNATIVE",
 159                       arm_fp16_format == ARM_FP16_FORMAT_ALTERNATIVE);
 160   def_or_undef_macro (pfile, "__ARM_FP16_ARGS",
 161                       arm_fp16_format != ARM_FP16_FORMAT_NONE);
 162
 163   def_or_undef_macro (pfile, "__ARM_FEATURE_FP16_SCALAR_ARITHMETIC",
 164                       TARGET_VFP_FP16INST);
 165   def_or_undef_macro (pfile, "__ARM_FEATURE_FP16_VECTOR_ARITHMETIC",
 166                       TARGET_NEON_FP16INST);
 167   def_or_undef_macro (pfile, "__ARM_FEATURE_FP16_FML", TARGET_FP16FML);
 168
 169   def_or_undef_macro (pfile, "__ARM_FEATURE_FMA", TARGET_FMA);
 170   def_or_undef_macro (pfile, "__ARM_NEON__", TARGET_NEON);
 171   def_or_undef_macro (pfile, "__ARM_NEON", TARGET_NEON);
 172
 173   cpp_undef (pfile, "__ARM_NEON_FP");
 174   if (TARGET_NEON_FP)
 175     builtin_define_with_int_value ("__ARM_NEON_FP", TARGET_NEON_FP);
 176
 177   /* Add a define for interworking. Needed when building libgcc.a.  */
 178   if (arm_cpp_interwork)
 179     builtin_define ("__THUMB_INTERWORK__");
 180
 181   builtin_define (arm_arch_name);
 182   if (arm_arch_xscale)
 183     builtin_define ("__XSCALE__");
 184   if (arm_arch_iwmmxt)
 185     {
 186       builtin_define ("__IWMMXT__");
 187       builtin_define ("__ARM_WMMX");
 188     }
 189   if (arm_arch_iwmmxt2)
 190     builtin_define ("__IWMMXT2__");
 191   /* ARMv6KZ was originally identified as the misspelled __ARM_ARCH_6ZK__.  To
 192      preserve the existing behavior, the misspelled feature macro must still be
 193      defined.  */
 194   if (arm_arch6kz)
 195     builtin_define ("__ARM_ARCH_6ZK__");
 196   if (TARGET_AAPCS_BASED)
 197     {
 198       if (arm_pcs_default == ARM_PCS_AAPCS_VFP)
 199         builtin_define ("__ARM_PCS_VFP");
 200       else if (arm_pcs_default == ARM_PCS_AAPCS)
 201         builtin_define ("__ARM_PCS");
 202       builtin_define ("__ARM_EABI__");
 203     }
 204
 205   def_or_undef_macro (pfile, "__ARM_ARCH_EXT_IDIV__", TARGET_IDIV);
 206   def_or_undef_macro (pfile, "__ARM_FEATURE_IDIV", TARGET_IDIV);
 207
 208   def_or_undef_macro (pfile, "__ARM_ASM_SYNTAX_UNIFIED__", inline_asm_unified);
 209
 210   cpp_undef (pfile, "__ARM_FEATURE_COPROC");
 211   if (TARGET_32BIT && arm_arch4 && !(arm_arch8 && arm_arch_notm))
 212     {
 213       int coproc_level = 0x1;
 214
 215       if (arm_arch5t)
 216         coproc_level |= 0x2;
 217       if (arm_arch5te)
 218         coproc_level |= 0x4;
 219       if (arm_arch6)
 220         coproc_level |= 0x8;
 221
 222       builtin_define_with_int_value ("__ARM_FEATURE_COPROC", coproc_level);
 223     }
 224 }
 225
 226 void
 227 arm_cpu_cpp_builtins (struct cpp_reader * pfile)
 228 {
 229   builtin_assert ("cpu=arm");
 230   builtin_assert ("machine=arm");
 231
 232   arm_cpu_builtins (pfile);
 233 }
 234
 235 /* Hook to validate the current #pragma GCC target and set the arch custom
 236    mode state.  If ARGS is NULL, then POP_TARGET is used to reset
 237    the options.  */
 238
 239 static bool
 240 arm_pragma_target_parse (tree args, tree pop_target)
 241 {
 242   tree prev_tree = target_option_current_node;
 243   tree cur_tree;
 244   struct cl_target_option *prev_opt;
 245   struct cl_target_option *cur_opt;
 246
 247   if (! args)
 248     {
 249       cur_tree = ((pop_target) ? pop_target : target_option_default_node);
 250       cl_target_option_restore (&global_options,
 251                                 TREE_TARGET_OPTION (cur_tree));
 252     }
 253   else
 254     {
 255       cur_tree = arm_valid_target_attribute_tree (args, &global_options,
 256                                                   &global_options_set);
 257       if (cur_tree == NULL_TREE)
 258         {
 259           cl_target_option_restore (&global_options,
 260                                     TREE_TARGET_OPTION (prev_tree));
 261           return false;
 262         }
 263
 264       /* handle_pragma_pop_options and handle_pragma_reset_options will set
 265        target_option_current_node, but not handle_pragma_target.  */
 266       target_option_current_node = cur_tree;
 267       arm_configure_build_target (&arm_active_target,
 268                                   TREE_TARGET_OPTION (cur_tree),
 269                                   &global_options_set, false);
 270     }
 271
 272   /* Update macros if target_node changes. The global state will be restored
 273      by arm_set_current_function.  */
 274   prev_opt = TREE_TARGET_OPTION (prev_tree);
 275   cur_opt  = TREE_TARGET_OPTION (cur_tree);
 276
 277   gcc_assert (prev_opt);
 278   gcc_assert (cur_opt);
 279
 280   if (cur_opt != prev_opt)
 281     {
 282       /* For the definitions, ensure all newly defined macros are considered
 283          as used for -Wunused-macros.  There is no point warning about the
 284          compiler predefined macros.  */
 285       cpp_options *cpp_opts = cpp_get_options (parse_in);
 286       unsigned char saved_warn_unused_macros = cpp_opts->warn_unused_macros;
 287
 288       cpp_opts->warn_unused_macros = 0;
 289
 290       /* Update macros.  */
 291       gcc_assert (cur_opt->x_target_flags == target_flags);
 292
 293       /* Don't warn for macros that have context sensitive values depending on
 294          other attributes.
 295          See warn_of_redefinition, reset after cpp_create_definition.  */
 296       tree acond_macro = get_identifier ("__ARM_NEON_FP");
 297       C_CPP_HASHNODE (acond_macro)->flags |= NODE_CONDITIONAL ;
 298
 299       acond_macro = get_identifier ("__ARM_FP");
 300       C_CPP_HASHNODE (acond_macro)->flags |= NODE_CONDITIONAL;
 301
 302       acond_macro = get_identifier ("__ARM_FEATURE_LDREX");
 303       C_CPP_HASHNODE (acond_macro)->flags |= NODE_CONDITIONAL;
 304
 305       arm_cpu_builtins (parse_in);
 306
 307       cpp_opts->warn_unused_macros = saved_warn_unused_macros;
 308
 309       /* Make sure that target_reinit is called for next function, since
 310          TREE_TARGET_OPTION might change with the #pragma even if there is
 311          no target attribute attached to the function.  */
 312       arm_reset_previous_fndecl ();
 313
 314       /* If going to the default mode, we restore the initial states.
 315          if cur_tree is a new target, states will be saved/restored on a per
 316          function basis in arm_set_current_function.  */
 317       if (cur_tree == target_option_default_node)
 318         save_restore_target_globals (cur_tree);
 319     }
 320
 321   return true;
 322 }
 323
 324 /* Register target pragmas.  We need to add the hook for parsing #pragma GCC
 325    option here rather than in arm.c since it will pull in various preprocessor
 326    functions, and those are not present in languages like fortran without a
 327    preprocessor.  */
 328
 329 void
 330 arm_register_target_pragmas (void)
 331 {
 332   /* Update pragma hook to allow parsing #pragma GCC target.  */
 333   targetm.target_option.pragma_parse = arm_pragma_target_parse;
 334
 335 #ifdef REGISTER_SUBTARGET_PRAGMAS
 336   REGISTER_SUBTARGET_PRAGMAS ();
 337 #endif
 338 }