gcc/defaults.h

   1 /* Definitions of various defaults for tm.h macros.
   2    Copyright (C) 1992, 1996, 1997, 1998, 1999, 2000, 2001, 2002
   3    Free Software Foundation, Inc.
   4    Contributed by Ron Guilmette (rfg@monkeys.com)
   5
   6 This file is part of GCC.
   7
   8 GCC is free software; you can redistribute it and/or modify it under
   9 the terms of the GNU General Public License as published by the Free
  10 Software Foundation; either version 2, or (at your option) any later
  11 version.
  12
  13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  15 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  16 for more details.
  17
  18 You should have received a copy of the GNU General Public License
  19 along with GCC; see the file COPYING.  If not, write to the Free
  20 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
  21 02111-1307, USA.  */
  22
  23 #ifndef GCC_DEFAULTS_H
  24 #define GCC_DEFAULTS_H
  25
  26 #ifndef GET_ENVIRONMENT
  27 #define GET_ENVIRONMENT(VALUE, NAME) do { (VALUE) = getenv (NAME); } while (0)
  28 #endif
  29
  30 #define obstack_chunk_alloc xmalloc
  31 #define obstack_chunk_free free
  32
  33 /* Define default standard character escape sequences.  */
  34 #ifndef TARGET_BELL
  35 #  define TARGET_BELL 007
  36 #  define TARGET_BS 010
  37 #  define TARGET_TAB 011
  38 #  define TARGET_NEWLINE 012
  39 #  define TARGET_VT 013
  40 #  define TARGET_FF 014
  41 #  define TARGET_CR 015
  42 #  define TARGET_ESC 033
  43 #endif
  44
  45 /* When removal of CPP_PREDEFINES is complete, TARGET_CPU_CPP_BULITINS
  46    can also be removed from here.  */
  47 #ifndef TARGET_OS_CPP_BUILTINS
  48 # define TARGET_OS_CPP_BUILTINS()
  49 #endif
  50 #ifndef TARGET_CPU_CPP_BUILTINS
  51 # define TARGET_CPU_CPP_BUILTINS()
  52 #endif
  53 #ifndef CPP_PREDEFINES
  54 # define CPP_PREDEFINES ""
  55 #endif
  56
  57 /* Store in OUTPUT a string (made with alloca) containing
  58    an assembler-name for a local static variable or function named NAME.
  59    LABELNO is an integer which is different for each call.  */
  60
  61 #ifndef ASM_FORMAT_PRIVATE_NAME
  62 #define ASM_FORMAT_PRIVATE_NAME(OUTPUT, NAME, LABELNO)                  \
  63   do {                                                                  \
  64     int len = strlen (NAME);                                            \
  65     char *temp = (char *) alloca (len + 3);                             \
  66     temp[0] = 'L';                                                      \
  67     strcpy (&temp[1], (NAME));                                          \
  68     temp[len + 1] = '.';                                                \
  69     temp[len + 2] = 0;                                                  \
  70     (OUTPUT) = (char *) alloca (strlen (NAME) + 11);                    \
  71     ASM_GENERATE_INTERNAL_LABEL (OUTPUT, temp, LABELNO);                \
  72   } while (0)
  73 #endif
  74
  75 #ifndef ASM_STABD_OP
  76 #define ASM_STABD_OP "\t.stabd\t"
  77 #endif
  78
  79 /* This is how to output an element of a case-vector that is absolute.
  80    Some targets don't use this, but we have to define it anyway.  */
  81
  82 #ifndef ASM_OUTPUT_ADDR_VEC_ELT
  83 #define ASM_OUTPUT_ADDR_VEC_ELT(FILE, VALUE)  \
  84 do { fputs (integer_asm_op (POINTER_SIZE / UNITS_PER_WORD, TRUE), FILE); \
  85      ASM_OUTPUT_INTERNAL_LABEL (FILE, "L", (VALUE));                    \
  86      fputc ('\n', FILE);                                                \
  87    } while (0)
  88 #endif
  89
  90 /* choose a reasonable default for ASM_OUTPUT_ASCII.  */
  91
  92 #ifndef ASM_OUTPUT_ASCII
  93 #define ASM_OUTPUT_ASCII(MYFILE, MYSTRING, MYLENGTH) \
  94   do {                                                                        \
  95     FILE *_hide_asm_out_file = (MYFILE);                                      \
  96     const unsigned char *_hide_p = (const unsigned char *) (MYSTRING);        \
  97     int _hide_thissize = (MYLENGTH);                                          \
  98     {                                                                         \
  99       FILE *asm_out_file = _hide_asm_out_file;                                \
 100       const unsigned char *p = _hide_p;                                       \
 101       int thissize = _hide_thissize;                                          \
 102       int i;                                                                  \
 103       fprintf (asm_out_file, "\t.ascii \"");                                  \
 104                                                                               \
 105       for (i = 0; i < thissize; i++)                                          \
 106         {                                                                     \
 107           int c = p[i];                                                       \
 108           if (c == '\"' || c == '\\')                                         \
 109             putc ('\\', asm_out_file);                                        \
 110           if (ISPRINT(c))                                                     \
 111             putc (c, asm_out_file);                                           \
 112           else                                                                \
 113             {                                                                 \
 114               fprintf (asm_out_file, "\\%o", c);                              \
 115               /* After an octal-escape, if a digit follows,                   \
 116                  terminate one string constant and start another.             \
 117                  The VAX assembler fails to stop reading the escape           \
 118                  after three digits, so this is the only way we               \
 119                  can get it to parse the data properly.  */                   \
 120               if (i < thissize - 1 && ISDIGIT(p[i + 1]))                      \
 121                 fprintf (asm_out_file, "\"\n\t.ascii \"");                    \
 122           }                                                                   \
 123         }                                                                     \
 124       fprintf (asm_out_file, "\"\n");                                         \
 125     }                                                                         \
 126   }                                                                           \
 127   while (0)
 128 #endif
 129
 130 /* This is how we tell the assembler to equate two values.  */
 131 #ifdef SET_ASM_OP
 132 #ifndef ASM_OUTPUT_DEF
 133 #define ASM_OUTPUT_DEF(FILE,LABEL1,LABEL2)                              \
 134  do {   fprintf ((FILE), "%s", SET_ASM_OP);                             \
 135         assemble_name (FILE, LABEL1);                                   \
 136         fprintf (FILE, ",");                                            \
 137         assemble_name (FILE, LABEL2);                                   \
 138         fprintf (FILE, "\n");                                           \
 139   } while (0)
 140 #endif
 141 #endif
 142
 143 /* This is how to output a reference to a user-level label named NAME.  */
 144
 145 #ifndef ASM_OUTPUT_LABELREF
 146 #define ASM_OUTPUT_LABELREF(FILE,NAME)  asm_fprintf ((FILE), "%U%s", (NAME))
 147 #endif
 148
 149 /* Allow target to print debug info labels specially.  This is useful for
 150    VLIW targets, since debug info labels should go into the middle of
 151    instruction bundles instead of breaking them.  */
 152
 153 #ifndef ASM_OUTPUT_DEBUG_LABEL
 154 #define ASM_OUTPUT_DEBUG_LABEL(FILE, PREFIX, NUM) \
 155   ASM_OUTPUT_INTERNAL_LABEL (FILE, PREFIX, NUM)
 156 #endif
 157
 158 /* This is how we tell the assembler that a symbol is weak.  */
 159 #ifndef ASM_OUTPUT_WEAK_ALIAS
 160 #if defined (ASM_WEAKEN_LABEL) && defined (ASM_OUTPUT_DEF)
 161 #define ASM_OUTPUT_WEAK_ALIAS(STREAM, NAME, VALUE)      \
 162   do                                                    \
 163     {                                                   \
 164       ASM_WEAKEN_LABEL (STREAM, NAME);                  \
 165       if (VALUE)                                        \
 166         ASM_OUTPUT_DEF (STREAM, NAME, VALUE);           \
 167     }                                                   \
 168   while (0)
 169 #endif
 170 #endif
 171
 172 /* How to emit a .type directive.  */
 173 #ifndef ASM_OUTPUT_TYPE_DIRECTIVE
 174 #if defined TYPE_ASM_OP && defined TYPE_OPERAND_FMT
 175 #define ASM_OUTPUT_TYPE_DIRECTIVE(STREAM, NAME, TYPE)   \
 176   do                                                    \
 177     {                                                   \
 178       fputs (TYPE_ASM_OP, STREAM);                      \
 179       assemble_name (STREAM, NAME);                     \
 180       fputs (", ", STREAM);                             \
 181       fprintf (STREAM, TYPE_OPERAND_FMT, TYPE);         \
 182       putc ('\n', STREAM);                              \
 183     }                                                   \
 184   while (0)
 185 #endif
 186 #endif
 187
 188 /* How to emit a .size directive.  */
 189 #ifndef ASM_OUTPUT_SIZE_DIRECTIVE
 190 #ifdef SIZE_ASM_OP
 191 #define ASM_OUTPUT_SIZE_DIRECTIVE(STREAM, NAME, SIZE)   \
 192   do                                                    \
 193     {                                                   \
 194       HOST_WIDE_INT size_ = (SIZE);                     \
 195       fputs (SIZE_ASM_OP, STREAM);                      \
 196       assemble_name (STREAM, NAME);                     \
 197       fputs (", ", STREAM);                             \
 198       fprintf (STREAM, HOST_WIDE_INT_PRINT_DEC, size_); \
 199       putc ('\n', STREAM);                              \
 200     }                                                   \
 201   while (0)
 202
 203 #define ASM_OUTPUT_MEASURED_SIZE(STREAM, NAME)          \
 204   do                                                    \
 205     {                                                   \
 206       fputs (SIZE_ASM_OP, STREAM);                      \
 207       assemble_name (STREAM, NAME);                     \
 208       fputs (", .-", STREAM);                           \
 209       assemble_name (STREAM, NAME);                     \
 210       putc ('\n', STREAM);                              \
 211     }                                                   \
 212   while (0)
 213
 214 #endif
 215 #endif
 216
 217 /* This determines whether or not we support weak symbols.  */
 218 #ifndef SUPPORTS_WEAK
 219 #if defined (ASM_WEAKEN_LABEL) || defined (ASM_WEAKEN_DECL)
 220 #define SUPPORTS_WEAK 1
 221 #else
 222 #define SUPPORTS_WEAK 0
 223 #endif
 224 #endif
 225
 226 /* This determines whether or not we support link-once semantics.  */
 227 #ifndef SUPPORTS_ONE_ONLY
 228 #ifdef MAKE_DECL_ONE_ONLY
 229 #define SUPPORTS_ONE_ONLY 1
 230 #else
 231 #define SUPPORTS_ONE_ONLY 0
 232 #endif
 233 #endif
 234
 235 /* If the target supports weak symbols, define TARGET_ATTRIBUTE_WEAK to
 236    provide a weak attribute.  Else define it to nothing.
 237
 238    This would normally belong in ansidecl.h, but SUPPORTS_WEAK is
 239    not available at that time.
 240
 241    Note, this is only for use by target files which we know are to be
 242    compiled by GCC.  */
 243 #ifndef TARGET_ATTRIBUTE_WEAK
 244 # if SUPPORTS_WEAK
 245 #  define TARGET_ATTRIBUTE_WEAK __attribute__ ((weak))
 246 # else
 247 #  define TARGET_ATTRIBUTE_WEAK
 248 # endif
 249 #endif
 250
 251 /* If the target supports init_priority C++ attribute, give
 252    SUPPORTS_INIT_PRIORITY a nonzero value.  */
 253 #ifndef SUPPORTS_INIT_PRIORITY
 254 #define SUPPORTS_INIT_PRIORITY 1
 255 #endif /* SUPPORTS_INIT_PRIORITY */
 256
 257 /* If duplicate library search directories can be removed from a
 258    linker command without changing the linker's semantics, give this
 259    symbol a nonzero.  */
 260 #ifndef LINK_ELIMINATE_DUPLICATE_LDIRECTORIES
 261 #define LINK_ELIMINATE_DUPLICATE_LDIRECTORIES 0
 262 #endif /* LINK_ELIMINATE_DUPLICATE_LDIRECTORIES */
 263
 264 /* If we have a definition of INCOMING_RETURN_ADDR_RTX, assume that
 265    the rest of the DWARF 2 frame unwind support is also provided.  */
 266 #if !defined (DWARF2_UNWIND_INFO) && defined (INCOMING_RETURN_ADDR_RTX)
 267 #define DWARF2_UNWIND_INFO 1
 268 #endif
 269
 270 /* If we have named sections, and we're using crtstuff to run ctors,
 271    use them for registering eh frame information.  */
 272 #if defined (TARGET_ASM_NAMED_SECTION) && DWARF2_UNWIND_INFO \
 273     && !defined(EH_FRAME_IN_DATA_SECTION)
 274 #ifndef EH_FRAME_SECTION_NAME
 275 #define EH_FRAME_SECTION_NAME ".eh_frame"
 276 #endif
 277 #endif
 278
 279 /* If we have named section and we support weak symbols, then use the
 280    .jcr section for recording java classes which need to be registered
 281    at program start-up time.  */
 282 #if defined (TARGET_ASM_NAMED_SECTION) && SUPPORTS_WEAK
 283 #ifndef JCR_SECTION_NAME
 284 #define JCR_SECTION_NAME ".jcr"
 285 #endif
 286 #endif
 287
 288 /* By default, we generate a label at the beginning and end of the
 289    text section, and compute the size of the text section by
 290    subtracting the two.  However, on some platforms that doesn't
 291    work, and we use the section itself, rather than a label at the
 292    beginning of it, to indicate the start of the section.  On such
 293    platforms, define this to zero.  */
 294 #ifndef DWARF2_GENERATE_TEXT_SECTION_LABEL
 295 #define DWARF2_GENERATE_TEXT_SECTION_LABEL 1
 296 #endif
 297
 298 /* Supply a default definition for PROMOTE_PROTOTYPES.  */
 299 #ifndef PROMOTE_PROTOTYPES
 300 #define PROMOTE_PROTOTYPES      0
 301 #endif
 302
 303 /* Number of hardware registers that go into the DWARF-2 unwind info.
 304    If not defined, equals FIRST_PSEUDO_REGISTER  */
 305
 306 #ifndef DWARF_FRAME_REGISTERS
 307 #define DWARF_FRAME_REGISTERS FIRST_PSEUDO_REGISTER
 308 #endif
 309
 310 /* How to renumber registers for dbx and gdb.  If not defined, assume
 311    no renumbering is necessary.  */
 312
 313 #ifndef DBX_REGISTER_NUMBER
 314 #define DBX_REGISTER_NUMBER(REGNO) (REGNO)
 315 #endif
 316
 317 /* Default sizes for base C types.  If the sizes are different for
 318    your target, you should override these values by defining the
 319    appropriate symbols in your tm.h file.  */
 320
 321 #ifndef BITS_PER_UNIT
 322 #define BITS_PER_UNIT 8
 323 #endif
 324
 325 #ifndef BITS_PER_WORD
 326 #define BITS_PER_WORD (BITS_PER_UNIT * UNITS_PER_WORD)
 327 #endif
 328
 329 #ifndef CHAR_TYPE_SIZE
 330 #define CHAR_TYPE_SIZE BITS_PER_UNIT
 331 #endif
 332
 333 #ifndef BOOL_TYPE_SIZE
 334 /* `bool' has size and alignment `1', on almost all platforms.  */
 335 #define BOOL_TYPE_SIZE CHAR_TYPE_SIZE
 336 #endif
 337
 338 #ifndef SHORT_TYPE_SIZE
 339 #define SHORT_TYPE_SIZE (BITS_PER_UNIT * MIN ((UNITS_PER_WORD + 1) / 2, 2))
 340 #endif
 341
 342 #ifndef INT_TYPE_SIZE
 343 #define INT_TYPE_SIZE BITS_PER_WORD
 344 #endif
 345
 346 #ifndef LONG_TYPE_SIZE
 347 #define LONG_TYPE_SIZE BITS_PER_WORD
 348 #endif
 349
 350 #ifndef LONG_LONG_TYPE_SIZE
 351 #define LONG_LONG_TYPE_SIZE (BITS_PER_WORD * 2)
 352 #endif
 353
 354 #ifndef WCHAR_TYPE_SIZE
 355 #define WCHAR_TYPE_SIZE INT_TYPE_SIZE
 356 #endif
 357
 358 #ifndef FLOAT_TYPE_SIZE
 359 #define FLOAT_TYPE_SIZE BITS_PER_WORD
 360 #endif
 361
 362 #ifndef DOUBLE_TYPE_SIZE
 363 #define DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
 364 #endif
 365
 366 #ifndef LONG_DOUBLE_TYPE_SIZE
 367 #define LONG_DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
 368 #endif
 369
 370 /* Width in bits of a pointer.  Mind the value of the macro `Pmode'.  */
 371 #ifndef POINTER_SIZE
 372 #define POINTER_SIZE BITS_PER_WORD
 373 #endif
 374
 375 #ifndef BUILD_VA_LIST_TYPE
 376 #define BUILD_VA_LIST_TYPE(X) ((X) = ptr_type_node)
 377 #endif
 378
 379 #ifndef PIC_OFFSET_TABLE_REGNUM
 380 #define PIC_OFFSET_TABLE_REGNUM INVALID_REGNUM
 381 #endif
 382
 383 /* Type used by GCOV counters.  Use 64bit data type if target supports
 384    it.  */
 385 #if LONG_TYPE_SIZE >= 64
 386 #define GCOV_TYPE_SIZE LONG_TYPE_SIZE
 387 #else
 388 #define GCOV_TYPE_SIZE LONG_LONG_TYPE_SIZE
 389 #endif
 390
 391
 392 /* By default, the preprocessor should be invoked the same way in C++
 393    as in C.  */
 394 #ifndef CPLUSPLUS_CPP_SPEC
 395 #ifdef CPP_SPEC
 396 #define CPLUSPLUS_CPP_SPEC CPP_SPEC
 397 #endif
 398 #endif
 399
 400 #ifndef ACCUMULATE_OUTGOING_ARGS
 401 #define ACCUMULATE_OUTGOING_ARGS 0
 402 #endif
 403
 404 /* Supply a default definition for PUSH_ARGS.  */
 405 #ifndef PUSH_ARGS
 406 #ifdef PUSH_ROUNDING
 407 #define PUSH_ARGS       !ACCUMULATE_OUTGOING_ARGS
 408 #else
 409 #define PUSH_ARGS       0
 410 #endif
 411 #endif
 412
 413 /* If PREFERRED_STACK_BOUNDARY is not defined, set it to STACK_BOUNDARY.
 414    STACK_BOUNDARY is required.  */
 415 #ifndef PREFERRED_STACK_BOUNDARY
 416 #define PREFERRED_STACK_BOUNDARY STACK_BOUNDARY
 417 #endif
 418
 419 /* By default, the C++ compiler will use function addresses in the
 420    vtable entries.  Setting this non-zero tells the compiler to use
 421    function descriptors instead.  The value of this macro says how
 422    many words wide the descriptor is (normally 2).  It is assumed
 423    that the address of a function descriptor may be treated as a
 424    pointer to a function.  */
 425 #ifndef TARGET_VTABLE_USES_DESCRIPTORS
 426 #define TARGET_VTABLE_USES_DESCRIPTORS 0
 427 #endif
 428
 429 /* By default, the vtable entries are void pointers, the so the alignment
 430    is the same as pointer alignment.  The value of this macro specifies
 431    the alignment of the vtable entry in bits.  It should be defined only
 432    when special alignment is necessary. */
 433 #ifndef TARGET_VTABLE_ENTRY_ALIGN
 434 #define TARGET_VTABLE_ENTRY_ALIGN POINTER_SIZE
 435 #endif
 436
 437 /* There are a few non-descriptor entries in the vtable at offsets below
 438    zero.  If these entries must be padded (say, to preserve the alignment
 439    specified by TARGET_VTABLE_ENTRY_ALIGN), set this to the number of
 440    words in each data entry.  */
 441 #ifndef TARGET_VTABLE_DATA_ENTRY_DISTANCE
 442 #define TARGET_VTABLE_DATA_ENTRY_DISTANCE 1
 443 #endif
 444
 445 /* Select a format to encode pointers in exception handling data.  We
 446    prefer those that result in fewer dynamic relocations.  Assume no
 447    special support here and encode direct references.  */
 448 #ifndef ASM_PREFERRED_EH_DATA_FORMAT
 449 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE,GLOBAL)  DW_EH_PE_absptr
 450 #endif
 451
 452 /* By default, the C++ compiler will use the lowest bit of the pointer
 453    to function to indicate a pointer-to-member-function points to a
 454    virtual member function.  However, if FUNCTION_BOUNDARY indicates
 455    function addresses aren't always even, the lowest bit of the delta
 456    field will be used.  */
 457 #ifndef TARGET_PTRMEMFUNC_VBIT_LOCATION
 458 #define TARGET_PTRMEMFUNC_VBIT_LOCATION \
 459   (FUNCTION_BOUNDARY >= 2 * BITS_PER_UNIT \
 460    ? ptrmemfunc_vbit_in_pfn : ptrmemfunc_vbit_in_delta)
 461 #endif
 462
 463 #ifndef DEFAULT_GDB_EXTENSIONS
 464 #define DEFAULT_GDB_EXTENSIONS 1
 465 #endif
 466
 467 /* If more than one debugging type is supported, you must define
 468    PREFERRED_DEBUGGING_TYPE to choose a format in a system-dependent way.
 469
 470    This is one long line cause VAXC can't handle a \-newline.  */
 471 #if 1 < (defined (DBX_DEBUGGING_INFO) + defined (SDB_DEBUGGING_INFO) + defined (DWARF_DEBUGGING_INFO) + defined (DWARF2_DEBUGGING_INFO) + defined (XCOFF_DEBUGGING_INFO) + defined (VMS_DEBUGGING_INFO))
 472 #ifndef PREFERRED_DEBUGGING_TYPE
 473 You Lose!  You must define PREFERRED_DEBUGGING_TYPE!
 474 #endif /* no PREFERRED_DEBUGGING_TYPE */
 475 #else /* Only one debugging format supported.  Define PREFERRED_DEBUGGING_TYPE
 476          so other code needn't care.  */
 477 #ifdef DBX_DEBUGGING_INFO
 478 #define PREFERRED_DEBUGGING_TYPE DBX_DEBUG
 479 #endif
 480 #ifdef SDB_DEBUGGING_INFO
 481 #define PREFERRED_DEBUGGING_TYPE SDB_DEBUG
 482 #endif
 483 #ifdef DWARF_DEBUGGING_INFO
 484 #define PREFERRED_DEBUGGING_TYPE DWARF_DEBUG
 485 #endif
 486 #ifdef DWARF2_DEBUGGING_INFO
 487 #define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
 488 #endif
 489 #ifdef VMS_DEBUGGING_INFO
 490 #define PREFERRED_DEBUGGING_TYPE VMS_AND_DWARF2_DEBUG
 491 #endif
 492 #ifdef XCOFF_DEBUGGING_INFO
 493 #define PREFERRED_DEBUGGING_TYPE XCOFF_DEBUG
 494 #endif
 495 #endif /* More than one debugger format enabled.  */
 496
 497 /* If still not defined, must have been because no debugging formats
 498    are supported.  */
 499 #ifndef PREFERRED_DEBUGGING_TYPE
 500 #define PREFERRED_DEBUGGING_TYPE NO_DEBUG
 501 #endif
 502
 503 /* This is set to 1 if BYTES_BIG_ENDIAN is defined but the target uses a
 504    little-endian method of passing and returning structures in registers.
 505    On the HP-UX IA64 and PA64 platforms structures are aligned differently
 506    then integral values and setting this value to 1 will allow for the
 507    special handling of structure arguments and return values in regs.  */
 508
 509 #ifndef FUNCTION_ARG_REG_LITTLE_ENDIAN
 510 #define FUNCTION_ARG_REG_LITTLE_ENDIAN 0
 511 #endif
 512
 513 /* Determine the register class for registers suitable to be the base
 514    address register in a MEM.  Allow the choice to be dependent upon
 515    the mode of the memory access.  */
 516 #ifndef MODE_BASE_REG_CLASS
 517 #define MODE_BASE_REG_CLASS(MODE) BASE_REG_CLASS
 518 #endif
 519
 520 #ifndef LARGEST_EXPONENT_IS_NORMAL
 521 #define LARGEST_EXPONENT_IS_NORMAL(SIZE) 0
 522 #endif
 523
 524 #ifndef ROUND_TOWARDS_ZERO
 525 #define ROUND_TOWARDS_ZERO 0
 526 #endif
 527
 528 #ifndef MODE_HAS_NANS
 529 #define MODE_HAS_NANS(MODE)                                     \
 530   (FLOAT_MODE_P (MODE)                                          \
 531    && TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT                  \
 532    && !LARGEST_EXPONENT_IS_NORMAL (GET_MODE_BITSIZE (MODE)))
 533 #endif
 534
 535 #ifndef MODE_HAS_INFINITIES
 536 #define MODE_HAS_INFINITIES(MODE)                               \
 537   (FLOAT_MODE_P (MODE)                                          \
 538    && TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT                  \
 539    && !LARGEST_EXPONENT_IS_NORMAL (GET_MODE_BITSIZE (MODE)))
 540 #endif
 541
 542 #ifndef MODE_HAS_SIGNED_ZEROS
 543 #define MODE_HAS_SIGNED_ZEROS(MODE) \
 544   (FLOAT_MODE_P (MODE) && TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT)
 545 #endif
 546
 547 #ifndef MODE_HAS_SIGN_DEPENDENT_ROUNDING
 548 #define MODE_HAS_SIGN_DEPENDENT_ROUNDING(MODE)                  \
 549   (FLOAT_MODE_P (MODE)                                          \
 550    && TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT                  \
 551    && !ROUND_TOWARDS_ZERO)
 552 #endif
 553
 554 #ifndef HOT_TEXT_SECTION_NAME
 555 #define HOT_TEXT_SECTION_NAME "text.hot"
 556 #endif
 557
 558 #ifndef UNLIKELY_EXECUTED_TEXT_SECTION_NAME
 559 #define UNLIKELY_EXECUTED_TEXT_SECTION_NAME "text.unlikely"
 560 #endif
 561
 562 #ifndef VECTOR_MODE_SUPPORTED_P
 563 #define VECTOR_MODE_SUPPORTED_P(MODE) 0
 564 #endif
 565
 566 /* Determine whether __cxa_atexit, rather than atexit, is used to
 567    register C++ destructors for local statics and global objects. */
 568 #ifndef DEFAULT_USE_CXA_ATEXIT
 569 #define DEFAULT_USE_CXA_ATEXIT 0
 570 #endif
 571
 572 #endif  /* ! GCC_DEFAULTS_H */