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     ((void *(*) (long)) xmalloc)
  31 #define obstack_chunk_free      ((void (*) (void *)) free)
  32 #define OBSTACK_CHUNK_SIZE      0
  33 #define gcc_obstack_init(OBSTACK)                       \
  34   _obstack_begin ((OBSTACK), OBSTACK_CHUNK_SIZE, 0,     \
  35                   obstack_chunk_alloc,                  \
  36                   obstack_chunk_free)
  37
  38 /* Define default standard character escape sequences.  */
  39 #ifndef TARGET_BELL
  40 #  define TARGET_BELL 007
  41 #  define TARGET_BS 010
  42 #  define TARGET_TAB 011
  43 #  define TARGET_NEWLINE 012
  44 #  define TARGET_VT 013
  45 #  define TARGET_FF 014
  46 #  define TARGET_CR 015
  47 #  define TARGET_ESC 033
  48 #endif
  49
  50 /* When removal of CPP_PREDEFINES is complete, TARGET_CPU_CPP_BULITINS
  51    can also be removed from here.  */
  52 #ifndef TARGET_OS_CPP_BUILTINS
  53 # define TARGET_OS_CPP_BUILTINS()
  54 #endif
  55 #ifndef TARGET_CPU_CPP_BUILTINS
  56 # define TARGET_CPU_CPP_BUILTINS()
  57 #endif
  58 #ifndef CPP_PREDEFINES
  59 # define CPP_PREDEFINES ""
  60 #endif
  61
  62 /* Store in OUTPUT a string (made with alloca) containing an
  63    assembler-name for a local static variable or function named NAME.
  64    LABELNO is an integer which is different for each call.  */
  65
  66 #ifndef ASM_PN_FORMAT
  67 # ifndef NO_DOT_IN_LABEL
  68 #  define ASM_PN_FORMAT "%s.%lu"
  69 # else
  70 #  ifndef NO_DOLLAR_IN_LABEL
  71 #   define ASM_PN_FORMAT "%s$%lu"
  72 #  else
  73 #   define ASM_PN_FORMAT "__%s_%lu"
  74 #  endif
  75 # endif
  76 #endif /* ! ASM_PN_FORMAT */
  77
  78 #ifndef ASM_FORMAT_PRIVATE_NAME
  79 # define ASM_FORMAT_PRIVATE_NAME(OUTPUT, NAME, LABELNO) \
  80   do { const char *const name_ = (NAME); \
  81        char *const output_ = (OUTPUT) = (char *) alloca (strlen (name_) + 32);\
  82        sprintf (output_, ASM_PN_FORMAT, name_, (unsigned long)(LABELNO)); \
  83   } while (0)
  84 #endif
  85
  86 #ifndef ASM_STABD_OP
  87 #define ASM_STABD_OP "\t.stabd\t"
  88 #endif
  89
  90 /* This is how to output an element of a case-vector that is absolute.
  91    Some targets don't use this, but we have to define it anyway.  */
  92
  93 #ifndef ASM_OUTPUT_ADDR_VEC_ELT
  94 #define ASM_OUTPUT_ADDR_VEC_ELT(FILE, VALUE)  \
  95 do { fputs (integer_asm_op (POINTER_SIZE / UNITS_PER_WORD, TRUE), FILE); \
  96      (*targetm.asm_out.internal_label) (FILE, "L", (VALUE));                    \
  97      fputc ('\n', FILE);                                                \
  98    } while (0)
  99 #endif
 100
 101 /* choose a reasonable default for ASM_OUTPUT_ASCII.  */
 102
 103 #ifndef ASM_OUTPUT_ASCII
 104 #define ASM_OUTPUT_ASCII(MYFILE, MYSTRING, MYLENGTH) \
 105   do {                                                                        \
 106     FILE *_hide_asm_out_file = (MYFILE);                                      \
 107     const unsigned char *_hide_p = (const unsigned char *) (MYSTRING);        \
 108     int _hide_thissize = (MYLENGTH);                                          \
 109     {                                                                         \
 110       FILE *asm_out_file = _hide_asm_out_file;                                \
 111       const unsigned char *p = _hide_p;                                       \
 112       int thissize = _hide_thissize;                                          \
 113       int i;                                                                  \
 114       fprintf (asm_out_file, "\t.ascii \"");                                  \
 115                                                                               \
 116       for (i = 0; i < thissize; i++)                                          \
 117         {                                                                     \
 118           int c = p[i];                                                       \
 119           if (c == '\"' || c == '\\')                                         \
 120             putc ('\\', asm_out_file);                                        \
 121           if (ISPRINT(c))                                                     \
 122             putc (c, asm_out_file);                                           \
 123           else                                                                \
 124             {                                                                 \
 125               fprintf (asm_out_file, "\\%o", c);                              \
 126               /* After an octal-escape, if a digit follows,                   \
 127                  terminate one string constant and start another.             \
 128                  The VAX assembler fails to stop reading the escape           \
 129                  after three digits, so this is the only way we               \
 130                  can get it to parse the data properly.  */                   \
 131               if (i < thissize - 1 && ISDIGIT(p[i + 1]))                      \
 132                 fprintf (asm_out_file, "\"\n\t.ascii \"");                    \
 133           }                                                                   \
 134         }                                                                     \
 135       fprintf (asm_out_file, "\"\n");                                         \
 136     }                                                                         \
 137   }                                                                           \
 138   while (0)
 139 #endif
 140
 141 /* This is how we tell the assembler to equate two values.  */
 142 #ifdef SET_ASM_OP
 143 #ifndef ASM_OUTPUT_DEF
 144 #define ASM_OUTPUT_DEF(FILE,LABEL1,LABEL2)                              \
 145  do {   fprintf ((FILE), "%s", SET_ASM_OP);                             \
 146         assemble_name (FILE, LABEL1);                                   \
 147         fprintf (FILE, ",");                                            \
 148         assemble_name (FILE, LABEL2);                                   \
 149         fprintf (FILE, "\n");                                           \
 150   } while (0)
 151 #endif
 152 #endif
 153
 154 /* This is how to output the definition of a user-level label named
 155    NAME, such as the label on a static function or variable NAME.  */
 156
 157 #ifndef ASM_OUTPUT_LABEL
 158 #define ASM_OUTPUT_LABEL(FILE,NAME) \
 159   do { assemble_name ((FILE), (NAME)); fputs (":\n", (FILE)); } while (0)
 160 #endif
 161
 162 /* This is how to output a reference to a user-level label named NAME.  */
 163
 164 #ifndef ASM_OUTPUT_LABELREF
 165 #define ASM_OUTPUT_LABELREF(FILE,NAME)  asm_fprintf ((FILE), "%U%s", (NAME))
 166 #endif
 167
 168 /* Allow target to print debug info labels specially.  This is useful for
 169    VLIW targets, since debug info labels should go into the middle of
 170    instruction bundles instead of breaking them.  */
 171
 172 #ifndef ASM_OUTPUT_DEBUG_LABEL
 173 #define ASM_OUTPUT_DEBUG_LABEL(FILE, PREFIX, NUM) \
 174   (*targetm.asm_out.internal_label) (FILE, PREFIX, NUM)
 175 #endif
 176
 177 /* This is how we tell the assembler that a symbol is weak.  */
 178 #ifndef ASM_OUTPUT_WEAK_ALIAS
 179 #if defined (ASM_WEAKEN_LABEL) && defined (ASM_OUTPUT_DEF)
 180 #define ASM_OUTPUT_WEAK_ALIAS(STREAM, NAME, VALUE)      \
 181   do                                                    \
 182     {                                                   \
 183       ASM_WEAKEN_LABEL (STREAM, NAME);                  \
 184       if (VALUE)                                        \
 185         ASM_OUTPUT_DEF (STREAM, NAME, VALUE);           \
 186     }                                                   \
 187   while (0)
 188 #endif
 189 #endif
 190
 191 /* How to emit a .type directive.  */
 192 #ifndef ASM_OUTPUT_TYPE_DIRECTIVE
 193 #if defined TYPE_ASM_OP && defined TYPE_OPERAND_FMT
 194 #define ASM_OUTPUT_TYPE_DIRECTIVE(STREAM, NAME, TYPE)   \
 195   do                                                    \
 196     {                                                   \
 197       fputs (TYPE_ASM_OP, STREAM);                      \
 198       assemble_name (STREAM, NAME);                     \
 199       fputs (", ", STREAM);                             \
 200       fprintf (STREAM, TYPE_OPERAND_FMT, TYPE);         \
 201       putc ('\n', STREAM);                              \
 202     }                                                   \
 203   while (0)
 204 #endif
 205 #endif
 206
 207 /* How to emit a .size directive.  */
 208 #ifndef ASM_OUTPUT_SIZE_DIRECTIVE
 209 #ifdef SIZE_ASM_OP
 210 #define ASM_OUTPUT_SIZE_DIRECTIVE(STREAM, NAME, SIZE)   \
 211   do                                                    \
 212     {                                                   \
 213       HOST_WIDE_INT size_ = (SIZE);                     \
 214       fputs (SIZE_ASM_OP, STREAM);                      \
 215       assemble_name (STREAM, NAME);                     \
 216       fputs (", ", STREAM);                             \
 217       fprintf (STREAM, HOST_WIDE_INT_PRINT_DEC, size_); \
 218       putc ('\n', STREAM);                              \
 219     }                                                   \
 220   while (0)
 221
 222 #define ASM_OUTPUT_MEASURED_SIZE(STREAM, NAME)          \
 223   do                                                    \
 224     {                                                   \
 225       fputs (SIZE_ASM_OP, STREAM);                      \
 226       assemble_name (STREAM, NAME);                     \
 227       fputs (", .-", STREAM);                           \
 228       assemble_name (STREAM, NAME);                     \
 229       putc ('\n', STREAM);                              \
 230     }                                                   \
 231   while (0)
 232
 233 #endif
 234 #endif
 235
 236 /* This determines whether or not we support weak symbols.  */
 237 #ifndef SUPPORTS_WEAK
 238 #if defined (ASM_WEAKEN_LABEL) || defined (ASM_WEAKEN_DECL)
 239 #define SUPPORTS_WEAK 1
 240 #else
 241 #define SUPPORTS_WEAK 0
 242 #endif
 243 #endif
 244
 245 /* This determines whether or not we support link-once semantics.  */
 246 #ifndef SUPPORTS_ONE_ONLY
 247 #ifdef MAKE_DECL_ONE_ONLY
 248 #define SUPPORTS_ONE_ONLY 1
 249 #else
 250 #define SUPPORTS_ONE_ONLY 0
 251 #endif
 252 #endif
 253
 254 /* By default, there is no prefix on user-defined symbols.  */
 255 #ifndef USER_LABEL_PREFIX
 256 #define USER_LABEL_PREFIX ""
 257 #endif
 258
 259 /* If the target supports weak symbols, define TARGET_ATTRIBUTE_WEAK to
 260    provide a weak attribute.  Else define it to nothing.
 261
 262    This would normally belong in ansidecl.h, but SUPPORTS_WEAK is
 263    not available at that time.
 264
 265    Note, this is only for use by target files which we know are to be
 266    compiled by GCC.  */
 267 #ifndef TARGET_ATTRIBUTE_WEAK
 268 # if SUPPORTS_WEAK
 269 #  define TARGET_ATTRIBUTE_WEAK __attribute__ ((weak))
 270 # else
 271 #  define TARGET_ATTRIBUTE_WEAK
 272 # endif
 273 #endif
 274
 275 /* If the target supports init_priority C++ attribute, give
 276    SUPPORTS_INIT_PRIORITY a nonzero value.  */
 277 #ifndef SUPPORTS_INIT_PRIORITY
 278 #define SUPPORTS_INIT_PRIORITY 1
 279 #endif /* SUPPORTS_INIT_PRIORITY */
 280
 281 /* If duplicate library search directories can be removed from a
 282    linker command without changing the linker's semantics, give this
 283    symbol a nonzero.  */
 284 #ifndef LINK_ELIMINATE_DUPLICATE_LDIRECTORIES
 285 #define LINK_ELIMINATE_DUPLICATE_LDIRECTORIES 0
 286 #endif /* LINK_ELIMINATE_DUPLICATE_LDIRECTORIES */
 287
 288 /* If we have a definition of INCOMING_RETURN_ADDR_RTX, assume that
 289    the rest of the DWARF 2 frame unwind support is also provided.  */
 290 #if !defined (DWARF2_UNWIND_INFO) && defined (INCOMING_RETURN_ADDR_RTX)
 291 #define DWARF2_UNWIND_INFO 1
 292 #endif
 293
 294 /* If we have named sections, and we're using crtstuff to run ctors,
 295    use them for registering eh frame information.  */
 296 #if defined (TARGET_ASM_NAMED_SECTION) && DWARF2_UNWIND_INFO \
 297     && !defined(EH_FRAME_IN_DATA_SECTION)
 298 #ifndef EH_FRAME_SECTION_NAME
 299 #define EH_FRAME_SECTION_NAME ".eh_frame"
 300 #endif
 301 #endif
 302
 303 /* If we have named section and we support weak symbols, then use the
 304    .jcr section for recording java classes which need to be registered
 305    at program start-up time.  */
 306 #if defined (TARGET_ASM_NAMED_SECTION) && SUPPORTS_WEAK
 307 #ifndef JCR_SECTION_NAME
 308 #define JCR_SECTION_NAME ".jcr"
 309 #endif
 310 #endif
 311
 312 /* By default, we generate a label at the beginning and end of the
 313    text section, and compute the size of the text section by
 314    subtracting the two.  However, on some platforms that doesn't
 315    work, and we use the section itself, rather than a label at the
 316    beginning of it, to indicate the start of the section.  On such
 317    platforms, define this to zero.  */
 318 #ifndef DWARF2_GENERATE_TEXT_SECTION_LABEL
 319 #define DWARF2_GENERATE_TEXT_SECTION_LABEL 1
 320 #endif
 321
 322 /* Supply a default definition for PROMOTE_PROTOTYPES.  */
 323 #ifndef PROMOTE_PROTOTYPES
 324 #define PROMOTE_PROTOTYPES      0
 325 #endif
 326
 327 /* Number of hardware registers that go into the DWARF-2 unwind info.
 328    If not defined, equals FIRST_PSEUDO_REGISTER  */
 329
 330 #ifndef DWARF_FRAME_REGISTERS
 331 #define DWARF_FRAME_REGISTERS FIRST_PSEUDO_REGISTER
 332 #endif
 333
 334 /* How to renumber registers for dbx and gdb.  If not defined, assume
 335    no renumbering is necessary.  */
 336
 337 #ifndef DBX_REGISTER_NUMBER
 338 #define DBX_REGISTER_NUMBER(REGNO) (REGNO)
 339 #endif
 340
 341 /* Default sizes for base C types.  If the sizes are different for
 342    your target, you should override these values by defining the
 343    appropriate symbols in your tm.h file.  */
 344
 345 #ifndef BITS_PER_UNIT
 346 #define BITS_PER_UNIT 8
 347 #endif
 348
 349 #ifndef BITS_PER_WORD
 350 #define BITS_PER_WORD (BITS_PER_UNIT * UNITS_PER_WORD)
 351 #endif
 352
 353 #ifndef CHAR_TYPE_SIZE
 354 #define CHAR_TYPE_SIZE BITS_PER_UNIT
 355 #endif
 356
 357 #ifndef BOOL_TYPE_SIZE
 358 /* `bool' has size and alignment `1', on almost all platforms.  */
 359 #define BOOL_TYPE_SIZE CHAR_TYPE_SIZE
 360 #endif
 361
 362 #ifndef SHORT_TYPE_SIZE
 363 #define SHORT_TYPE_SIZE (BITS_PER_UNIT * MIN ((UNITS_PER_WORD + 1) / 2, 2))
 364 #endif
 365
 366 #ifndef INT_TYPE_SIZE
 367 #define INT_TYPE_SIZE BITS_PER_WORD
 368 #endif
 369
 370 #ifndef LONG_TYPE_SIZE
 371 #define LONG_TYPE_SIZE BITS_PER_WORD
 372 #endif
 373
 374 #ifndef LONG_LONG_TYPE_SIZE
 375 #define LONG_LONG_TYPE_SIZE (BITS_PER_WORD * 2)
 376 #endif
 377
 378 #ifndef WCHAR_TYPE_SIZE
 379 #define WCHAR_TYPE_SIZE INT_TYPE_SIZE
 380 #endif
 381
 382 #ifndef FLOAT_TYPE_SIZE
 383 #define FLOAT_TYPE_SIZE BITS_PER_WORD
 384 #endif
 385
 386 #ifndef DOUBLE_TYPE_SIZE
 387 #define DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
 388 #endif
 389
 390 #ifndef LONG_DOUBLE_TYPE_SIZE
 391 #define LONG_DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
 392 #endif
 393
 394 /* Width in bits of a pointer.  Mind the value of the macro `Pmode'.  */
 395 #ifndef POINTER_SIZE
 396 #define POINTER_SIZE BITS_PER_WORD
 397 #endif
 398
 399 #ifndef BUILD_VA_LIST_TYPE
 400 #define BUILD_VA_LIST_TYPE(X) ((X) = ptr_type_node)
 401 #endif
 402
 403 #ifndef PIC_OFFSET_TABLE_REGNUM
 404 #define PIC_OFFSET_TABLE_REGNUM INVALID_REGNUM
 405 #endif
 406
 407 /* By default, the preprocessor should be invoked the same way in C++
 408    as in C.  */
 409 #ifndef CPLUSPLUS_CPP_SPEC
 410 #ifdef CPP_SPEC
 411 #define CPLUSPLUS_CPP_SPEC CPP_SPEC
 412 #endif
 413 #endif
 414
 415 #ifndef ACCUMULATE_OUTGOING_ARGS
 416 #define ACCUMULATE_OUTGOING_ARGS 0
 417 #endif
 418
 419 /* Supply a default definition for PUSH_ARGS.  */
 420 #ifndef PUSH_ARGS
 421 #ifdef PUSH_ROUNDING
 422 #define PUSH_ARGS       !ACCUMULATE_OUTGOING_ARGS
 423 #else
 424 #define PUSH_ARGS       0
 425 #endif
 426 #endif
 427
 428 /* If PREFERRED_STACK_BOUNDARY is not defined, set it to STACK_BOUNDARY.
 429    STACK_BOUNDARY is required.  */
 430 #ifndef PREFERRED_STACK_BOUNDARY
 431 #define PREFERRED_STACK_BOUNDARY STACK_BOUNDARY
 432 #endif
 433
 434 /* By default, the C++ compiler will use function addresses in the
 435    vtable entries.  Setting this nonzero tells the compiler to use
 436    function descriptors instead.  The value of this macro says how
 437    many words wide the descriptor is (normally 2).  It is assumed
 438    that the address of a function descriptor may be treated as a
 439    pointer to a function.  */
 440 #ifndef TARGET_VTABLE_USES_DESCRIPTORS
 441 #define TARGET_VTABLE_USES_DESCRIPTORS 0
 442 #endif
 443
 444 /* By default, the vtable entries are void pointers, the so the alignment
 445    is the same as pointer alignment.  The value of this macro specifies
 446    the alignment of the vtable entry in bits.  It should be defined only
 447    when special alignment is necessary.  */
 448 #ifndef TARGET_VTABLE_ENTRY_ALIGN
 449 #define TARGET_VTABLE_ENTRY_ALIGN POINTER_SIZE
 450 #endif
 451
 452 /* There are a few non-descriptor entries in the vtable at offsets below
 453    zero.  If these entries must be padded (say, to preserve the alignment
 454    specified by TARGET_VTABLE_ENTRY_ALIGN), set this to the number of
 455    words in each data entry.  */
 456 #ifndef TARGET_VTABLE_DATA_ENTRY_DISTANCE
 457 #define TARGET_VTABLE_DATA_ENTRY_DISTANCE 1
 458 #endif
 459
 460 /* Select a format to encode pointers in exception handling data.  We
 461    prefer those that result in fewer dynamic relocations.  Assume no
 462    special support here and encode direct references.  */
 463 #ifndef ASM_PREFERRED_EH_DATA_FORMAT
 464 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE,GLOBAL)  DW_EH_PE_absptr
 465 #endif
 466
 467 /* By default, the C++ compiler will use the lowest bit of the pointer
 468    to function to indicate a pointer-to-member-function points to a
 469    virtual member function.  However, if FUNCTION_BOUNDARY indicates
 470    function addresses aren't always even, the lowest bit of the delta
 471    field will be used.  */
 472 #ifndef TARGET_PTRMEMFUNC_VBIT_LOCATION
 473 #define TARGET_PTRMEMFUNC_VBIT_LOCATION \
 474   (FUNCTION_BOUNDARY >= 2 * BITS_PER_UNIT \
 475    ? ptrmemfunc_vbit_in_pfn : ptrmemfunc_vbit_in_delta)
 476 #endif
 477
 478 #ifndef DEFAULT_GDB_EXTENSIONS
 479 #define DEFAULT_GDB_EXTENSIONS 1
 480 #endif
 481
 482 /* If more than one debugging type is supported, you must define
 483    PREFERRED_DEBUGGING_TYPE to choose a format in a system-dependent way.
 484
 485    This is one long line cause VAXC can't handle a \-newline.  */
 486 #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))
 487 #ifndef PREFERRED_DEBUGGING_TYPE
 488 You Lose!  You must define PREFERRED_DEBUGGING_TYPE!
 489 #endif /* no PREFERRED_DEBUGGING_TYPE */
 490 #else /* Only one debugging format supported.  Define PREFERRED_DEBUGGING_TYPE
 491          so other code needn't care.  */
 492 #ifdef DBX_DEBUGGING_INFO
 493 #define PREFERRED_DEBUGGING_TYPE DBX_DEBUG
 494 #endif
 495 #ifdef SDB_DEBUGGING_INFO
 496 #define PREFERRED_DEBUGGING_TYPE SDB_DEBUG
 497 #endif
 498 #ifdef DWARF_DEBUGGING_INFO
 499 #define PREFERRED_DEBUGGING_TYPE DWARF_DEBUG
 500 #endif
 501 #ifdef DWARF2_DEBUGGING_INFO
 502 #define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
 503 #endif
 504 #ifdef VMS_DEBUGGING_INFO
 505 #define PREFERRED_DEBUGGING_TYPE VMS_AND_DWARF2_DEBUG
 506 #endif
 507 #ifdef XCOFF_DEBUGGING_INFO
 508 #define PREFERRED_DEBUGGING_TYPE XCOFF_DEBUG
 509 #endif
 510 #endif /* More than one debugger format enabled.  */
 511
 512 /* If still not defined, must have been because no debugging formats
 513    are supported.  */
 514 #ifndef PREFERRED_DEBUGGING_TYPE
 515 #define PREFERRED_DEBUGGING_TYPE NO_DEBUG
 516 #endif
 517
 518 /* Define codes for all the float formats that we know of.  */
 519 #define UNKNOWN_FLOAT_FORMAT 0
 520 #define IEEE_FLOAT_FORMAT 1
 521 #define VAX_FLOAT_FORMAT 2
 522 #define IBM_FLOAT_FORMAT 3
 523 #define C4X_FLOAT_FORMAT 4
 524
 525 /* Default to IEEE float if not specified.  Nearly all machines use it.  */
 526 #ifndef TARGET_FLOAT_FORMAT
 527 #define TARGET_FLOAT_FORMAT     IEEE_FLOAT_FORMAT
 528 #endif
 529
 530 /* Determine the register class for registers suitable to be the base
 531    address register in a MEM.  Allow the choice to be dependent upon
 532    the mode of the memory access.  */
 533 #ifndef MODE_BASE_REG_CLASS
 534 #define MODE_BASE_REG_CLASS(MODE) BASE_REG_CLASS
 535 #endif
 536
 537 #ifndef LARGEST_EXPONENT_IS_NORMAL
 538 #define LARGEST_EXPONENT_IS_NORMAL(SIZE) 0
 539 #endif
 540
 541 #ifndef ROUND_TOWARDS_ZERO
 542 #define ROUND_TOWARDS_ZERO 0
 543 #endif
 544
 545 #ifndef MODE_HAS_NANS
 546 #define MODE_HAS_NANS(MODE)                                     \
 547   (FLOAT_MODE_P (MODE)                                          \
 548    && TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT                  \
 549    && !LARGEST_EXPONENT_IS_NORMAL (GET_MODE_BITSIZE (MODE)))
 550 #endif
 551
 552 #ifndef MODE_HAS_INFINITIES
 553 #define MODE_HAS_INFINITIES(MODE)                               \
 554   (FLOAT_MODE_P (MODE)                                          \
 555    && TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT                  \
 556    && !LARGEST_EXPONENT_IS_NORMAL (GET_MODE_BITSIZE (MODE)))
 557 #endif
 558
 559 #ifndef MODE_HAS_SIGNED_ZEROS
 560 #define MODE_HAS_SIGNED_ZEROS(MODE) \
 561   (FLOAT_MODE_P (MODE) && TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT)
 562 #endif
 563
 564 #ifndef MODE_HAS_SIGN_DEPENDENT_ROUNDING
 565 #define MODE_HAS_SIGN_DEPENDENT_ROUNDING(MODE)                  \
 566   (FLOAT_MODE_P (MODE)                                          \
 567    && TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT                  \
 568    && !ROUND_TOWARDS_ZERO)
 569 #endif
 570
 571 /* If FLOAT_WORDS_BIG_ENDIAN is not defined in the header files,
 572    then the word-endianness is the same as for integers.  */
 573 #ifndef FLOAT_WORDS_BIG_ENDIAN
 574 #define FLOAT_WORDS_BIG_ENDIAN WORDS_BIG_ENDIAN
 575 #endif
 576
 577 #ifndef TARGET_FLT_EVAL_METHOD
 578 #define TARGET_FLT_EVAL_METHOD 0
 579 #endif
 580
 581 #ifndef HOT_TEXT_SECTION_NAME
 582 #define HOT_TEXT_SECTION_NAME "text.hot"
 583 #endif
 584
 585 #ifndef UNLIKELY_EXECUTED_TEXT_SECTION_NAME
 586 #define UNLIKELY_EXECUTED_TEXT_SECTION_NAME "text.unlikely"
 587 #endif
 588
 589 #ifndef VECTOR_MODE_SUPPORTED_P
 590 #define VECTOR_MODE_SUPPORTED_P(MODE) 0
 591 #endif
 592
 593 /* Determine whether __cxa_atexit, rather than atexit, is used to
 594    register C++ destructors for local statics and global objects.  */
 595 #ifndef DEFAULT_USE_CXA_ATEXIT
 596 #define DEFAULT_USE_CXA_ATEXIT 0
 597 #endif
 598
 599 /* Determine whether extra constraint letter should be handled
 600    via address reload (like 'o').  */
 601 #ifndef EXTRA_MEMORY_CONSTRAINT
 602 #define EXTRA_MEMORY_CONSTRAINT(C,STR) 0
 603 #endif
 604
 605 /* Determine whether extra constraint letter should be handled
 606    as an address (like 'p').  */
 607 #ifndef EXTRA_ADDRESS_CONSTRAINT
 608 #define EXTRA_ADDRESS_CONSTRAINT(C,STR) 0
 609 #endif
 610
 611 /* When a port defines CONSTRAINT_LEN, it should use DEFAULT_CONSTRAINT_LEN
 612    for all the characters that it does not want to change, so things like the
 613   'length' of a digit in a matching constraint is an implementation detail,
 614    and not part of the interface.  */
 615 #define DEFAULT_CONSTRAINT_LEN(C,STR) 1
 616
 617 #ifndef CONSTRAINT_LEN
 618 #define CONSTRAINT_LEN(C,STR) DEFAULT_CONSTRAINT_LEN (C, STR)
 619 #endif
 620
 621 #if defined (CONST_OK_FOR_LETTER_P) && ! defined (CONST_OK_FOR_CONSTRAINT_P)
 622 #define CONST_OK_FOR_CONSTRAINT_P(VAL,C,STR) CONST_OK_FOR_LETTER_P (VAL, C)
 623 #endif
 624
 625 #if defined (CONST_DOUBLE_OK_FOR_LETTER_P) && ! defined (CONST_DOUBLE_OK_FOR_CONSTRAINT_P)
 626 #define CONST_DOUBLE_OK_FOR_CONSTRAINT_P(OP,C,STR) \
 627   CONST_DOUBLE_OK_FOR_LETTER_P (OP, C)
 628 #endif
 629
 630 #define REG_CLASS_FROM_CONSTRAINT(C,STR) REG_CLASS_FROM_LETTER (C)
 631
 632 #if defined (EXTRA_CONSTRAINT) && ! defined (EXTRA_CONSTRAINT_STR)
 633 #define EXTRA_CONSTRAINT_STR(OP, C,STR) EXTRA_CONSTRAINT (OP, C)
 634 #endif
 635
 636 /* Determine whether the the entire c99 runtime
 637    is present in the runtime library.  */
 638 #ifndef TARGET_C99_FUNCTIONS
 639 #define TARGET_C99_FUNCTIONS 0
 640 #endif
 641
 642 /* Indicate that CLZ and CTZ are undefined at zero.  */
 643 #ifndef CLZ_DEFINED_VALUE_AT_ZERO
 644 #define CLZ_DEFINED_VALUE_AT_ZERO(MODE, VALUE)  0
 645 #endif
 646 #ifndef CTZ_DEFINED_VALUE_AT_ZERO
 647 #define CTZ_DEFINED_VALUE_AT_ZERO(MODE, VALUE)  0
 648 #endif
 649
 650 #endif  /* ! GCC_DEFAULTS_H */