gcc/defaults.h

   1 /* Definitions of various defaults for tm.h macros.
   2    Copyright (C) 1992, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003
   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 an
  58    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_PN_FORMAT
  62 # ifndef NO_DOT_IN_LABEL
  63 #  define ASM_PN_FORMAT "%s.%lu"
  64 # else
  65 #  ifndef NO_DOLLAR_IN_LABEL
  66 #   define ASM_PN_FORMAT "%s$%lu"
  67 #  else
  68 #   define ASM_PN_FORMAT "__%s_%lu"
  69 #  endif
  70 # endif
  71 #endif /* ! ASM_PN_FORMAT */
  72
  73 #ifndef ASM_FORMAT_PRIVATE_NAME
  74 # define ASM_FORMAT_PRIVATE_NAME(OUTPUT, NAME, LABELNO) \
  75   do { const char *const name_ = (NAME); \
  76        char *const output_ = (OUTPUT) = (char *) alloca (strlen (name_) + 32);\
  77        sprintf (output_, ASM_PN_FORMAT, name_, (unsigned long)(LABELNO)); \
  78   } while (0)
  79 #endif
  80
  81 #ifndef ASM_STABD_OP
  82 #define ASM_STABD_OP "\t.stabd\t"
  83 #endif
  84
  85 /* This is how to output an element of a case-vector that is absolute.
  86    Some targets don't use this, but we have to define it anyway.  */
  87
  88 #ifndef ASM_OUTPUT_ADDR_VEC_ELT
  89 #define ASM_OUTPUT_ADDR_VEC_ELT(FILE, VALUE)  \
  90 do { fputs (integer_asm_op (POINTER_SIZE / UNITS_PER_WORD, TRUE), FILE); \
  91      (*targetm.asm_out.internal_label) (FILE, "L", (VALUE));                    \
  92      fputc ('\n', FILE);                                                \
  93    } while (0)
  94 #endif
  95
  96 /* choose a reasonable default for ASM_OUTPUT_ASCII.  */
  97
  98 #ifndef ASM_OUTPUT_ASCII
  99 #define ASM_OUTPUT_ASCII(MYFILE, MYSTRING, MYLENGTH) \
 100   do {                                                                        \
 101     FILE *_hide_asm_out_file = (MYFILE);                                      \
 102     const unsigned char *_hide_p = (const unsigned char *) (MYSTRING);        \
 103     int _hide_thissize = (MYLENGTH);                                          \
 104     {                                                                         \
 105       FILE *asm_out_file = _hide_asm_out_file;                                \
 106       const unsigned char *p = _hide_p;                                       \
 107       int thissize = _hide_thissize;                                          \
 108       int i;                                                                  \
 109       fprintf (asm_out_file, "\t.ascii \"");                                  \
 110                                                                               \
 111       for (i = 0; i < thissize; i++)                                          \
 112         {                                                                     \
 113           int c = p[i];                                                       \
 114           if (c == '\"' || c == '\\')                                         \
 115             putc ('\\', asm_out_file);                                        \
 116           if (ISPRINT(c))                                                     \
 117             putc (c, asm_out_file);                                           \
 118           else                                                                \
 119             {                                                                 \
 120               fprintf (asm_out_file, "\\%o", c);                              \
 121               /* After an octal-escape, if a digit follows,                   \
 122                  terminate one string constant and start another.             \
 123                  The VAX assembler fails to stop reading the escape           \
 124                  after three digits, so this is the only way we               \
 125                  can get it to parse the data properly.  */                   \
 126               if (i < thissize - 1 && ISDIGIT(p[i + 1]))                      \
 127                 fprintf (asm_out_file, "\"\n\t.ascii \"");                    \
 128           }                                                                   \
 129         }                                                                     \
 130       fprintf (asm_out_file, "\"\n");                                         \
 131     }                                                                         \
 132   }                                                                           \
 133   while (0)
 134 #endif
 135
 136 /* This is how we tell the assembler to equate two values.  */
 137 #ifdef SET_ASM_OP
 138 #ifndef ASM_OUTPUT_DEF
 139 #define ASM_OUTPUT_DEF(FILE,LABEL1,LABEL2)                              \
 140  do {   fprintf ((FILE), "%s", SET_ASM_OP);                             \
 141         assemble_name (FILE, LABEL1);                                   \
 142         fprintf (FILE, ",");                                            \
 143         assemble_name (FILE, LABEL2);                                   \
 144         fprintf (FILE, "\n");                                           \
 145   } while (0)
 146 #endif
 147 #endif
 148
 149 /* This is how to output the definition of a user-level label named
 150    NAME, such as the label on a static function or variable NAME.  */
 151
 152 #ifndef ASM_OUTPUT_LABEL
 153 #define ASM_OUTPUT_LABEL(FILE,NAME) \
 154   do { assemble_name ((FILE), (NAME)); fputs (":\n", (FILE)); } while (0)
 155 #endif
 156
 157 /* This is how to output a reference to a user-level label named NAME.  */
 158
 159 #ifndef ASM_OUTPUT_LABELREF
 160 #define ASM_OUTPUT_LABELREF(FILE,NAME)  asm_fprintf ((FILE), "%U%s", (NAME))
 161 #endif
 162
 163 /* Allow target to print debug info labels specially.  This is useful for
 164    VLIW targets, since debug info labels should go into the middle of
 165    instruction bundles instead of breaking them.  */
 166
 167 #ifndef ASM_OUTPUT_DEBUG_LABEL
 168 #define ASM_OUTPUT_DEBUG_LABEL(FILE, PREFIX, NUM) \
 169   (*targetm.asm_out.internal_label) (FILE, PREFIX, NUM)
 170 #endif
 171
 172 /* This is how we tell the assembler that a symbol is weak.  */
 173 #ifndef ASM_OUTPUT_WEAK_ALIAS
 174 #if defined (ASM_WEAKEN_LABEL) && defined (ASM_OUTPUT_DEF)
 175 #define ASM_OUTPUT_WEAK_ALIAS(STREAM, NAME, VALUE)      \
 176   do                                                    \
 177     {                                                   \
 178       ASM_WEAKEN_LABEL (STREAM, NAME);                  \
 179       if (VALUE)                                        \
 180         ASM_OUTPUT_DEF (STREAM, NAME, VALUE);           \
 181     }                                                   \
 182   while (0)
 183 #endif
 184 #endif
 185
 186 /* How to emit a .type directive.  */
 187 #ifndef ASM_OUTPUT_TYPE_DIRECTIVE
 188 #if defined TYPE_ASM_OP && defined TYPE_OPERAND_FMT
 189 #define ASM_OUTPUT_TYPE_DIRECTIVE(STREAM, NAME, TYPE)   \
 190   do                                                    \
 191     {                                                   \
 192       fputs (TYPE_ASM_OP, STREAM);                      \
 193       assemble_name (STREAM, NAME);                     \
 194       fputs (", ", STREAM);                             \
 195       fprintf (STREAM, TYPE_OPERAND_FMT, TYPE);         \
 196       putc ('\n', STREAM);                              \
 197     }                                                   \
 198   while (0)
 199 #endif
 200 #endif
 201
 202 /* How to emit a .size directive.  */
 203 #ifndef ASM_OUTPUT_SIZE_DIRECTIVE
 204 #ifdef SIZE_ASM_OP
 205 #define ASM_OUTPUT_SIZE_DIRECTIVE(STREAM, NAME, SIZE)   \
 206   do                                                    \
 207     {                                                   \
 208       HOST_WIDE_INT size_ = (SIZE);                     \
 209       fputs (SIZE_ASM_OP, STREAM);                      \
 210       assemble_name (STREAM, NAME);                     \
 211       fputs (", ", STREAM);                             \
 212       fprintf (STREAM, HOST_WIDE_INT_PRINT_DEC, size_); \
 213       putc ('\n', STREAM);                              \
 214     }                                                   \
 215   while (0)
 216
 217 #define ASM_OUTPUT_MEASURED_SIZE(STREAM, NAME)          \
 218   do                                                    \
 219     {                                                   \
 220       fputs (SIZE_ASM_OP, STREAM);                      \
 221       assemble_name (STREAM, NAME);                     \
 222       fputs (", .-", STREAM);                           \
 223       assemble_name (STREAM, NAME);                     \
 224       putc ('\n', STREAM);                              \
 225     }                                                   \
 226   while (0)
 227
 228 #endif
 229 #endif
 230
 231 /* This determines whether or not we support weak symbols.  */
 232 #ifndef SUPPORTS_WEAK
 233 #if defined (ASM_WEAKEN_LABEL) || defined (ASM_WEAKEN_DECL)
 234 #define SUPPORTS_WEAK 1
 235 #else
 236 #define SUPPORTS_WEAK 0
 237 #endif
 238 #endif
 239
 240 /* This determines whether or not we support link-once semantics.  */
 241 #ifndef SUPPORTS_ONE_ONLY
 242 #ifdef MAKE_DECL_ONE_ONLY
 243 #define SUPPORTS_ONE_ONLY 1
 244 #else
 245 #define SUPPORTS_ONE_ONLY 0
 246 #endif
 247 #endif
 248
 249 /* By default, there is no prefix on user-defined symbols.  */
 250 #ifndef USER_LABEL_PREFIX
 251 #define USER_LABEL_PREFIX ""
 252 #endif
 253
 254 /* If the target supports weak symbols, define TARGET_ATTRIBUTE_WEAK to
 255    provide a weak attribute.  Else define it to nothing.
 256
 257    This would normally belong in ansidecl.h, but SUPPORTS_WEAK is
 258    not available at that time.
 259
 260    Note, this is only for use by target files which we know are to be
 261    compiled by GCC.  */
 262 #ifndef TARGET_ATTRIBUTE_WEAK
 263 # if SUPPORTS_WEAK
 264 #  define TARGET_ATTRIBUTE_WEAK __attribute__ ((weak))
 265 # else
 266 #  define TARGET_ATTRIBUTE_WEAK
 267 # endif
 268 #endif
 269
 270 /* If the target supports init_priority C++ attribute, give
 271    SUPPORTS_INIT_PRIORITY a nonzero value.  */
 272 #ifndef SUPPORTS_INIT_PRIORITY
 273 #define SUPPORTS_INIT_PRIORITY 1
 274 #endif /* SUPPORTS_INIT_PRIORITY */
 275
 276 /* If duplicate library search directories can be removed from a
 277    linker command without changing the linker's semantics, give this
 278    symbol a nonzero.  */
 279 #ifndef LINK_ELIMINATE_DUPLICATE_LDIRECTORIES
 280 #define LINK_ELIMINATE_DUPLICATE_LDIRECTORIES 0
 281 #endif /* LINK_ELIMINATE_DUPLICATE_LDIRECTORIES */
 282
 283 /* If we have a definition of INCOMING_RETURN_ADDR_RTX, assume that
 284    the rest of the DWARF 2 frame unwind support is also provided.  */
 285 #if !defined (DWARF2_UNWIND_INFO) && defined (INCOMING_RETURN_ADDR_RTX)
 286 #define DWARF2_UNWIND_INFO 1
 287 #endif
 288
 289 /* If we have named sections, and we're using crtstuff to run ctors,
 290    use them for registering eh frame information.  */
 291 #if defined (TARGET_ASM_NAMED_SECTION) && DWARF2_UNWIND_INFO \
 292     && !defined(EH_FRAME_IN_DATA_SECTION)
 293 #ifndef EH_FRAME_SECTION_NAME
 294 #define EH_FRAME_SECTION_NAME ".eh_frame"
 295 #endif
 296 #endif
 297
 298 /* If we have named section and we support weak symbols, then use the
 299    .jcr section for recording java classes which need to be registered
 300    at program start-up time.  */
 301 #if defined (TARGET_ASM_NAMED_SECTION) && SUPPORTS_WEAK
 302 #ifndef JCR_SECTION_NAME
 303 #define JCR_SECTION_NAME ".jcr"
 304 #endif
 305 #endif
 306
 307 /* By default, we generate a label at the beginning and end of the
 308    text section, and compute the size of the text section by
 309    subtracting the two.  However, on some platforms that doesn't
 310    work, and we use the section itself, rather than a label at the
 311    beginning of it, to indicate the start of the section.  On such
 312    platforms, define this to zero.  */
 313 #ifndef DWARF2_GENERATE_TEXT_SECTION_LABEL
 314 #define DWARF2_GENERATE_TEXT_SECTION_LABEL 1
 315 #endif
 316
 317 /* Supply a default definition for PROMOTE_PROTOTYPES.  */
 318 #ifndef PROMOTE_PROTOTYPES
 319 #define PROMOTE_PROTOTYPES      0
 320 #endif
 321
 322 /* Number of hardware registers that go into the DWARF-2 unwind info.
 323    If not defined, equals FIRST_PSEUDO_REGISTER  */
 324
 325 #ifndef DWARF_FRAME_REGISTERS
 326 #define DWARF_FRAME_REGISTERS FIRST_PSEUDO_REGISTER
 327 #endif
 328
 329 /* How to renumber registers for dbx and gdb.  If not defined, assume
 330    no renumbering is necessary.  */
 331
 332 #ifndef DBX_REGISTER_NUMBER
 333 #define DBX_REGISTER_NUMBER(REGNO) (REGNO)
 334 #endif
 335
 336 /* Default sizes for base C types.  If the sizes are different for
 337    your target, you should override these values by defining the
 338    appropriate symbols in your tm.h file.  */
 339
 340 #ifndef BITS_PER_UNIT
 341 #define BITS_PER_UNIT 8
 342 #endif
 343
 344 #ifndef BITS_PER_WORD
 345 #define BITS_PER_WORD (BITS_PER_UNIT * UNITS_PER_WORD)
 346 #endif
 347
 348 #ifndef CHAR_TYPE_SIZE
 349 #define CHAR_TYPE_SIZE BITS_PER_UNIT
 350 #endif
 351
 352 #ifndef BOOL_TYPE_SIZE
 353 /* `bool' has size and alignment `1', on almost all platforms.  */
 354 #define BOOL_TYPE_SIZE CHAR_TYPE_SIZE
 355 #endif
 356
 357 #ifndef SHORT_TYPE_SIZE
 358 #define SHORT_TYPE_SIZE (BITS_PER_UNIT * MIN ((UNITS_PER_WORD + 1) / 2, 2))
 359 #endif
 360
 361 #ifndef INT_TYPE_SIZE
 362 #define INT_TYPE_SIZE BITS_PER_WORD
 363 #endif
 364
 365 #ifndef LONG_TYPE_SIZE
 366 #define LONG_TYPE_SIZE BITS_PER_WORD
 367 #endif
 368
 369 #ifndef LONG_LONG_TYPE_SIZE
 370 #define LONG_LONG_TYPE_SIZE (BITS_PER_WORD * 2)
 371 #endif
 372
 373 #ifndef WCHAR_TYPE_SIZE
 374 #define WCHAR_TYPE_SIZE INT_TYPE_SIZE
 375 #endif
 376
 377 #ifndef FLOAT_TYPE_SIZE
 378 #define FLOAT_TYPE_SIZE BITS_PER_WORD
 379 #endif
 380
 381 #ifndef DOUBLE_TYPE_SIZE
 382 #define DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
 383 #endif
 384
 385 #ifndef LONG_DOUBLE_TYPE_SIZE
 386 #define LONG_DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
 387 #endif
 388
 389 /* Width in bits of a pointer.  Mind the value of the macro `Pmode'.  */
 390 #ifndef POINTER_SIZE
 391 #define POINTER_SIZE BITS_PER_WORD
 392 #endif
 393
 394 #ifndef BUILD_VA_LIST_TYPE
 395 #define BUILD_VA_LIST_TYPE(X) ((X) = ptr_type_node)
 396 #endif
 397
 398 #ifndef PIC_OFFSET_TABLE_REGNUM
 399 #define PIC_OFFSET_TABLE_REGNUM INVALID_REGNUM
 400 #endif
 401
 402 /* Type used by GCOV counters.  Use 64bit data type if target supports
 403    it.  */
 404 #if LONG_TYPE_SIZE >= 64
 405 #define GCOV_TYPE_SIZE LONG_TYPE_SIZE
 406 #else
 407 #define GCOV_TYPE_SIZE LONG_LONG_TYPE_SIZE
 408 #endif
 409
 410
 411 /* By default, the preprocessor should be invoked the same way in C++
 412    as in C.  */
 413 #ifndef CPLUSPLUS_CPP_SPEC
 414 #ifdef CPP_SPEC
 415 #define CPLUSPLUS_CPP_SPEC CPP_SPEC
 416 #endif
 417 #endif
 418
 419 #ifndef ACCUMULATE_OUTGOING_ARGS
 420 #define ACCUMULATE_OUTGOING_ARGS 0
 421 #endif
 422
 423 /* Supply a default definition for PUSH_ARGS.  */
 424 #ifndef PUSH_ARGS
 425 #ifdef PUSH_ROUNDING
 426 #define PUSH_ARGS       !ACCUMULATE_OUTGOING_ARGS
 427 #else
 428 #define PUSH_ARGS       0
 429 #endif
 430 #endif
 431
 432 /* If PREFERRED_STACK_BOUNDARY is not defined, set it to STACK_BOUNDARY.
 433    STACK_BOUNDARY is required.  */
 434 #ifndef PREFERRED_STACK_BOUNDARY
 435 #define PREFERRED_STACK_BOUNDARY STACK_BOUNDARY
 436 #endif
 437
 438 /* By default, the C++ compiler will use function addresses in the
 439    vtable entries.  Setting this nonzero tells the compiler to use
 440    function descriptors instead.  The value of this macro says how
 441    many words wide the descriptor is (normally 2).  It is assumed
 442    that the address of a function descriptor may be treated as a
 443    pointer to a function.  */
 444 #ifndef TARGET_VTABLE_USES_DESCRIPTORS
 445 #define TARGET_VTABLE_USES_DESCRIPTORS 0
 446 #endif
 447
 448 /* By default, the vtable entries are void pointers, the so the alignment
 449    is the same as pointer alignment.  The value of this macro specifies
 450    the alignment of the vtable entry in bits.  It should be defined only
 451    when special alignment is necessary.  */
 452 #ifndef TARGET_VTABLE_ENTRY_ALIGN
 453 #define TARGET_VTABLE_ENTRY_ALIGN POINTER_SIZE
 454 #endif
 455
 456 /* There are a few non-descriptor entries in the vtable at offsets below
 457    zero.  If these entries must be padded (say, to preserve the alignment
 458    specified by TARGET_VTABLE_ENTRY_ALIGN), set this to the number of
 459    words in each data entry.  */
 460 #ifndef TARGET_VTABLE_DATA_ENTRY_DISTANCE
 461 #define TARGET_VTABLE_DATA_ENTRY_DISTANCE 1
 462 #endif
 463
 464 /* Select a format to encode pointers in exception handling data.  We
 465    prefer those that result in fewer dynamic relocations.  Assume no
 466    special support here and encode direct references.  */
 467 #ifndef ASM_PREFERRED_EH_DATA_FORMAT
 468 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE,GLOBAL)  DW_EH_PE_absptr
 469 #endif
 470
 471 /* By default, the C++ compiler will use the lowest bit of the pointer
 472    to function to indicate a pointer-to-member-function points to a
 473    virtual member function.  However, if FUNCTION_BOUNDARY indicates
 474    function addresses aren't always even, the lowest bit of the delta
 475    field will be used.  */
 476 #ifndef TARGET_PTRMEMFUNC_VBIT_LOCATION
 477 #define TARGET_PTRMEMFUNC_VBIT_LOCATION \
 478   (FUNCTION_BOUNDARY >= 2 * BITS_PER_UNIT \
 479    ? ptrmemfunc_vbit_in_pfn : ptrmemfunc_vbit_in_delta)
 480 #endif
 481
 482 #ifndef DEFAULT_GDB_EXTENSIONS
 483 #define DEFAULT_GDB_EXTENSIONS 1
 484 #endif
 485
 486 /* If more than one debugging type is supported, you must define
 487    PREFERRED_DEBUGGING_TYPE to choose a format in a system-dependent way.
 488
 489    This is one long line cause VAXC can't handle a \-newline.  */
 490 #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))
 491 #ifndef PREFERRED_DEBUGGING_TYPE
 492 You Lose!  You must define PREFERRED_DEBUGGING_TYPE!
 493 #endif /* no PREFERRED_DEBUGGING_TYPE */
 494 #else /* Only one debugging format supported.  Define PREFERRED_DEBUGGING_TYPE
 495          so other code needn't care.  */
 496 #ifdef DBX_DEBUGGING_INFO
 497 #define PREFERRED_DEBUGGING_TYPE DBX_DEBUG
 498 #endif
 499 #ifdef SDB_DEBUGGING_INFO
 500 #define PREFERRED_DEBUGGING_TYPE SDB_DEBUG
 501 #endif
 502 #ifdef DWARF_DEBUGGING_INFO
 503 #define PREFERRED_DEBUGGING_TYPE DWARF_DEBUG
 504 #endif
 505 #ifdef DWARF2_DEBUGGING_INFO
 506 #define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
 507 #endif
 508 #ifdef VMS_DEBUGGING_INFO
 509 #define PREFERRED_DEBUGGING_TYPE VMS_AND_DWARF2_DEBUG
 510 #endif
 511 #ifdef XCOFF_DEBUGGING_INFO
 512 #define PREFERRED_DEBUGGING_TYPE XCOFF_DEBUG
 513 #endif
 514 #endif /* More than one debugger format enabled.  */
 515
 516 /* If still not defined, must have been because no debugging formats
 517    are supported.  */
 518 #ifndef PREFERRED_DEBUGGING_TYPE
 519 #define PREFERRED_DEBUGGING_TYPE NO_DEBUG
 520 #endif
 521
 522 /* Define codes for all the float formats that we know of.  */
 523 #define UNKNOWN_FLOAT_FORMAT 0
 524 #define IEEE_FLOAT_FORMAT 1
 525 #define VAX_FLOAT_FORMAT 2
 526 #define IBM_FLOAT_FORMAT 3
 527 #define C4X_FLOAT_FORMAT 4
 528
 529 /* Default to IEEE float if not specified.  Nearly all machines use it.  */
 530 #ifndef TARGET_FLOAT_FORMAT
 531 #define TARGET_FLOAT_FORMAT     IEEE_FLOAT_FORMAT
 532 #endif
 533
 534 /* Determine the register class for registers suitable to be the base
 535    address register in a MEM.  Allow the choice to be dependent upon
 536    the mode of the memory access.  */
 537 #ifndef MODE_BASE_REG_CLASS
 538 #define MODE_BASE_REG_CLASS(MODE) BASE_REG_CLASS
 539 #endif
 540
 541 #ifndef LARGEST_EXPONENT_IS_NORMAL
 542 #define LARGEST_EXPONENT_IS_NORMAL(SIZE) 0
 543 #endif
 544
 545 #ifndef ROUND_TOWARDS_ZERO
 546 #define ROUND_TOWARDS_ZERO 0
 547 #endif
 548
 549 #ifndef MODE_HAS_NANS
 550 #define MODE_HAS_NANS(MODE)                                     \
 551   (FLOAT_MODE_P (MODE)                                          \
 552    && TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT                  \
 553    && !LARGEST_EXPONENT_IS_NORMAL (GET_MODE_BITSIZE (MODE)))
 554 #endif
 555
 556 #ifndef MODE_HAS_INFINITIES
 557 #define MODE_HAS_INFINITIES(MODE)                               \
 558   (FLOAT_MODE_P (MODE)                                          \
 559    && TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT                  \
 560    && !LARGEST_EXPONENT_IS_NORMAL (GET_MODE_BITSIZE (MODE)))
 561 #endif
 562
 563 #ifndef MODE_HAS_SIGNED_ZEROS
 564 #define MODE_HAS_SIGNED_ZEROS(MODE) \
 565   (FLOAT_MODE_P (MODE) && TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT)
 566 #endif
 567
 568 #ifndef MODE_HAS_SIGN_DEPENDENT_ROUNDING
 569 #define MODE_HAS_SIGN_DEPENDENT_ROUNDING(MODE)                  \
 570   (FLOAT_MODE_P (MODE)                                          \
 571    && TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT                  \
 572    && !ROUND_TOWARDS_ZERO)
 573 #endif
 574
 575 /* If FLOAT_WORDS_BIG_ENDIAN and HOST_FLOAT_WORDS_BIG_ENDIAN are not defined
 576    in the header files, then this implies the word-endianness is the same as
 577    for integers.  */
 578 #ifndef FLOAT_WORDS_BIG_ENDIAN
 579 #define FLOAT_WORDS_BIG_ENDIAN WORDS_BIG_ENDIAN
 580 #endif
 581
 582 #ifndef TARGET_FLT_EVAL_METHOD
 583 #define TARGET_FLT_EVAL_METHOD 0
 584 #endif
 585
 586 #ifndef HOT_TEXT_SECTION_NAME
 587 #define HOT_TEXT_SECTION_NAME "text.hot"
 588 #endif
 589
 590 #ifndef UNLIKELY_EXECUTED_TEXT_SECTION_NAME
 591 #define UNLIKELY_EXECUTED_TEXT_SECTION_NAME "text.unlikely"
 592 #endif
 593
 594 #ifndef VECTOR_MODE_SUPPORTED_P
 595 #define VECTOR_MODE_SUPPORTED_P(MODE) 0
 596 #endif
 597
 598 /* Determine whether __cxa_atexit, rather than atexit, is used to
 599    register C++ destructors for local statics and global objects.  */
 600 #ifndef DEFAULT_USE_CXA_ATEXIT
 601 #define DEFAULT_USE_CXA_ATEXIT 0
 602 #endif
 603
 604 /* Determine whether extra constraint letter should be handled
 605    via address reload (like 'o').  */
 606 #ifndef EXTRA_MEMORY_CONSTRAINT
 607 #define EXTRA_MEMORY_CONSTRAINT(C,STR) 0
 608 #endif
 609
 610 /* Determine whether extra constraint letter should be handled
 611    as an address (like 'p').  */
 612 #ifndef EXTRA_ADDRESS_CONSTRAINT
 613 #define EXTRA_ADDRESS_CONSTRAINT(C,STR) 0
 614 #endif
 615
 616 /* When a port defines CONSTRAINT_LEN, it should use DEFAULT_CONSTRAINT_LEN
 617    for all the characters that it does not want to change, so things like the
 618   'length' of a digit in a matching constraint is an implementation detail,
 619    and not part of the interface.  */
 620 #define DEFAULT_CONSTRAINT_LEN(C,STR) 1
 621
 622 #ifndef CONSTRAINT_LEN
 623 #define CONSTRAINT_LEN(C,STR) DEFAULT_CONSTRAINT_LEN (C, STR)
 624 #endif
 625
 626 #if defined (CONST_OK_FOR_LETTER_P) && ! defined (CONST_OK_FOR_CONSTRAINT_P)
 627 #define CONST_OK_FOR_CONSTRAINT_P(VAL,C,STR) CONST_OK_FOR_LETTER_P (VAL, C)
 628 #endif
 629
 630 #if defined (CONST_DOUBLE_OK_FOR_LETTER_P) && ! defined (CONST_DOUBLE_OK_FOR_CONSTRAINT_P)
 631 #define CONST_DOUBLE_OK_FOR_CONSTRAINT_P(OP,C,STR) \
 632   CONST_DOUBLE_OK_FOR_LETTER_P (OP, C)
 633 #endif
 634
 635 #define REG_CLASS_FROM_CONSTRAINT(C,STR) REG_CLASS_FROM_LETTER (C)
 636
 637 #if defined (EXTRA_CONSTRAINT) && ! defined (EXTRA_CONSTRAINT_STR)
 638 #define EXTRA_CONSTRAINT_STR(OP, C,STR) EXTRA_CONSTRAINT (OP, C)
 639 #endif
 640
 641 #endif  /* ! GCC_DEFAULTS_H */