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 /* Store in OUTPUT a string (made with alloca) containing an
  51    assembler-name for a local static variable or function named NAME.
  52    LABELNO is an integer which is different for each call.  */
  53
  54 #ifndef ASM_PN_FORMAT
  55 # ifndef NO_DOT_IN_LABEL
  56 #  define ASM_PN_FORMAT "%s.%lu"
  57 # else
  58 #  ifndef NO_DOLLAR_IN_LABEL
  59 #   define ASM_PN_FORMAT "%s$%lu"
  60 #  else
  61 #   define ASM_PN_FORMAT "__%s_%lu"
  62 #  endif
  63 # endif
  64 #endif /* ! ASM_PN_FORMAT */
  65
  66 #ifndef ASM_FORMAT_PRIVATE_NAME
  67 # define ASM_FORMAT_PRIVATE_NAME(OUTPUT, NAME, LABELNO) \
  68   do { const char *const name_ = (NAME); \
  69        char *const output_ = (OUTPUT) = alloca (strlen (name_) + 32);\
  70        sprintf (output_, ASM_PN_FORMAT, name_, (unsigned long)(LABELNO)); \
  71   } while (0)
  72 #endif
  73
  74 #ifndef ASM_STABD_OP
  75 #define ASM_STABD_OP "\t.stabd\t"
  76 #endif
  77
  78 /* This is how to output an element of a case-vector that is absolute.
  79    Some targets don't use this, but we have to define it anyway.  */
  80
  81 #ifndef ASM_OUTPUT_ADDR_VEC_ELT
  82 #define ASM_OUTPUT_ADDR_VEC_ELT(FILE, VALUE)  \
  83 do { fputs (integer_asm_op (POINTER_SIZE / UNITS_PER_WORD, TRUE), FILE); \
  84      (*targetm.asm_out.internal_label) (FILE, "L", (VALUE));                    \
  85      fputc ('\n', FILE);                                                \
  86    } while (0)
  87 #endif
  88
  89 /* choose a reasonable default for ASM_OUTPUT_ASCII.  */
  90
  91 #ifndef ASM_OUTPUT_ASCII
  92 #define ASM_OUTPUT_ASCII(MYFILE, MYSTRING, MYLENGTH) \
  93   do {                                                                        \
  94     FILE *_hide_asm_out_file = (MYFILE);                                      \
  95     const unsigned char *_hide_p = (const unsigned char *) (MYSTRING);        \
  96     int _hide_thissize = (MYLENGTH);                                          \
  97     {                                                                         \
  98       FILE *asm_out_file = _hide_asm_out_file;                                \
  99       const unsigned char *p = _hide_p;                                       \
 100       int thissize = _hide_thissize;                                          \
 101       int i;                                                                  \
 102       fprintf (asm_out_file, "\t.ascii \"");                                  \
 103                                                                               \
 104       for (i = 0; i < thissize; i++)                                          \
 105         {                                                                     \
 106           int c = p[i];                                                       \
 107           if (c == '\"' || c == '\\')                                         \
 108             putc ('\\', asm_out_file);                                        \
 109           if (ISPRINT(c))                                                     \
 110             putc (c, asm_out_file);                                           \
 111           else                                                                \
 112             {                                                                 \
 113               fprintf (asm_out_file, "\\%o", c);                              \
 114               /* After an octal-escape, if a digit follows,                   \
 115                  terminate one string constant and start another.             \
 116                  The VAX assembler fails to stop reading the escape           \
 117                  after three digits, so this is the only way we               \
 118                  can get it to parse the data properly.  */                   \
 119               if (i < thissize - 1 && ISDIGIT(p[i + 1]))                      \
 120                 fprintf (asm_out_file, "\"\n\t.ascii \"");                    \
 121           }                                                                   \
 122         }                                                                     \
 123       fprintf (asm_out_file, "\"\n");                                         \
 124     }                                                                         \
 125   }                                                                           \
 126   while (0)
 127 #endif
 128
 129 /* This is how we tell the assembler to equate two values.  */
 130 #ifdef SET_ASM_OP
 131 #ifndef ASM_OUTPUT_DEF
 132 #define ASM_OUTPUT_DEF(FILE,LABEL1,LABEL2)                              \
 133  do {   fprintf ((FILE), "%s", SET_ASM_OP);                             \
 134         assemble_name (FILE, LABEL1);                                   \
 135         fprintf (FILE, ",");                                            \
 136         assemble_name (FILE, LABEL2);                                   \
 137         fprintf (FILE, "\n");                                           \
 138   } while (0)
 139 #endif
 140 #endif
 141
 142 /* This is how to output the definition of a user-level label named
 143    NAME, such as the label on a static function or variable NAME.  */
 144
 145 #ifndef ASM_OUTPUT_LABEL
 146 #define ASM_OUTPUT_LABEL(FILE,NAME) \
 147   do { assemble_name ((FILE), (NAME)); fputs (":\n", (FILE)); } while (0)
 148 #endif
 149
 150 /* This is how to output a reference to a user-level label named NAME.  */
 151
 152 #ifndef ASM_OUTPUT_LABELREF
 153 #define ASM_OUTPUT_LABELREF(FILE,NAME)  asm_fprintf ((FILE), "%U%s", (NAME))
 154 #endif
 155
 156 /* Allow target to print debug info labels specially.  This is useful for
 157    VLIW targets, since debug info labels should go into the middle of
 158    instruction bundles instead of breaking them.  */
 159
 160 #ifndef ASM_OUTPUT_DEBUG_LABEL
 161 #define ASM_OUTPUT_DEBUG_LABEL(FILE, PREFIX, NUM) \
 162   (*targetm.asm_out.internal_label) (FILE, PREFIX, NUM)
 163 #endif
 164
 165 /* This is how we tell the assembler that a symbol is weak.  */
 166 #ifndef ASM_OUTPUT_WEAK_ALIAS
 167 #if defined (ASM_WEAKEN_LABEL) && defined (ASM_OUTPUT_DEF)
 168 #define ASM_OUTPUT_WEAK_ALIAS(STREAM, NAME, VALUE)      \
 169   do                                                    \
 170     {                                                   \
 171       ASM_WEAKEN_LABEL (STREAM, NAME);                  \
 172       if (VALUE)                                        \
 173         ASM_OUTPUT_DEF (STREAM, NAME, VALUE);           \
 174     }                                                   \
 175   while (0)
 176 #endif
 177 #endif
 178
 179 /* How to emit a .type directive.  */
 180 #ifndef ASM_OUTPUT_TYPE_DIRECTIVE
 181 #if defined TYPE_ASM_OP && defined TYPE_OPERAND_FMT
 182 #define ASM_OUTPUT_TYPE_DIRECTIVE(STREAM, NAME, TYPE)   \
 183   do                                                    \
 184     {                                                   \
 185       fputs (TYPE_ASM_OP, STREAM);                      \
 186       assemble_name (STREAM, NAME);                     \
 187       fputs (", ", STREAM);                             \
 188       fprintf (STREAM, TYPE_OPERAND_FMT, TYPE);         \
 189       putc ('\n', STREAM);                              \
 190     }                                                   \
 191   while (0)
 192 #endif
 193 #endif
 194
 195 /* How to emit a .size directive.  */
 196 #ifndef ASM_OUTPUT_SIZE_DIRECTIVE
 197 #ifdef SIZE_ASM_OP
 198 #define ASM_OUTPUT_SIZE_DIRECTIVE(STREAM, NAME, SIZE)   \
 199   do                                                    \
 200     {                                                   \
 201       HOST_WIDE_INT size_ = (SIZE);                     \
 202       fputs (SIZE_ASM_OP, STREAM);                      \
 203       assemble_name (STREAM, NAME);                     \
 204       fprintf (STREAM, ", " HOST_WIDE_INT_PRINT_DEC "\n", size_); \
 205     }                                                   \
 206   while (0)
 207
 208 #define ASM_OUTPUT_MEASURED_SIZE(STREAM, NAME)          \
 209   do                                                    \
 210     {                                                   \
 211       fputs (SIZE_ASM_OP, STREAM);                      \
 212       assemble_name (STREAM, NAME);                     \
 213       fputs (", .-", STREAM);                           \
 214       assemble_name (STREAM, NAME);                     \
 215       putc ('\n', STREAM);                              \
 216     }                                                   \
 217   while (0)
 218
 219 #endif
 220 #endif
 221
 222 /* This determines whether or not we support weak symbols.  */
 223 #ifndef SUPPORTS_WEAK
 224 #if defined (ASM_WEAKEN_LABEL) || defined (ASM_WEAKEN_DECL)
 225 #define SUPPORTS_WEAK 1
 226 #else
 227 #define SUPPORTS_WEAK 0
 228 #endif
 229 #endif
 230
 231 /* This determines whether or not we support link-once semantics.  */
 232 #ifndef SUPPORTS_ONE_ONLY
 233 #ifdef MAKE_DECL_ONE_ONLY
 234 #define SUPPORTS_ONE_ONLY 1
 235 #else
 236 #define SUPPORTS_ONE_ONLY 0
 237 #endif
 238 #endif
 239
 240 /* By default, there is no prefix on user-defined symbols.  */
 241 #ifndef USER_LABEL_PREFIX
 242 #define USER_LABEL_PREFIX ""
 243 #endif
 244
 245 /* If the target supports weak symbols, define TARGET_ATTRIBUTE_WEAK to
 246    provide a weak attribute.  Else define it to nothing.
 247
 248    This would normally belong in ansidecl.h, but SUPPORTS_WEAK is
 249    not available at that time.
 250
 251    Note, this is only for use by target files which we know are to be
 252    compiled by GCC.  */
 253 #ifndef TARGET_ATTRIBUTE_WEAK
 254 # if SUPPORTS_WEAK
 255 #  define TARGET_ATTRIBUTE_WEAK __attribute__ ((weak))
 256 # else
 257 #  define TARGET_ATTRIBUTE_WEAK
 258 # endif
 259 #endif
 260
 261 /* If the target supports init_priority C++ attribute, give
 262    SUPPORTS_INIT_PRIORITY a nonzero value.  */
 263 #ifndef SUPPORTS_INIT_PRIORITY
 264 #define SUPPORTS_INIT_PRIORITY 1
 265 #endif /* SUPPORTS_INIT_PRIORITY */
 266
 267 /* If duplicate library search directories can be removed from a
 268    linker command without changing the linker's semantics, give this
 269    symbol a nonzero.  */
 270 #ifndef LINK_ELIMINATE_DUPLICATE_LDIRECTORIES
 271 #define LINK_ELIMINATE_DUPLICATE_LDIRECTORIES 0
 272 #endif /* LINK_ELIMINATE_DUPLICATE_LDIRECTORIES */
 273
 274 /* If we have a definition of INCOMING_RETURN_ADDR_RTX, assume that
 275    the rest of the DWARF 2 frame unwind support is also provided.  */
 276 #if !defined (DWARF2_UNWIND_INFO) && defined (INCOMING_RETURN_ADDR_RTX)
 277 #define DWARF2_UNWIND_INFO 1
 278 #endif
 279
 280 /* If we have named sections, and we're using crtstuff to run ctors,
 281    use them for registering eh frame information.  */
 282 #if defined (TARGET_ASM_NAMED_SECTION) && DWARF2_UNWIND_INFO \
 283     && !defined(EH_FRAME_IN_DATA_SECTION)
 284 #ifndef EH_FRAME_SECTION_NAME
 285 #define EH_FRAME_SECTION_NAME ".eh_frame"
 286 #endif
 287 #endif
 288
 289 /* If we have named section and we support weak symbols, then use the
 290    .jcr section for recording java classes which need to be registered
 291    at program start-up time.  */
 292 #if defined (TARGET_ASM_NAMED_SECTION) && SUPPORTS_WEAK
 293 #ifndef JCR_SECTION_NAME
 294 #define JCR_SECTION_NAME ".jcr"
 295 #endif
 296 #endif
 297
 298 /* By default, we generate a label at the beginning and end of the
 299    text section, and compute the size of the text section by
 300    subtracting the two.  However, on some platforms that doesn't
 301    work, and we use the section itself, rather than a label at the
 302    beginning of it, to indicate the start of the section.  On such
 303    platforms, define this to zero.  */
 304 #ifndef DWARF2_GENERATE_TEXT_SECTION_LABEL
 305 #define DWARF2_GENERATE_TEXT_SECTION_LABEL 1
 306 #endif
 307
 308 /* Supply a default definition for PROMOTE_PROTOTYPES.  */
 309 #ifndef PROMOTE_PROTOTYPES
 310 #define PROMOTE_PROTOTYPES      0
 311 #endif
 312
 313 /* Number of hardware registers that go into the DWARF-2 unwind info.
 314    If not defined, equals FIRST_PSEUDO_REGISTER  */
 315
 316 #ifndef DWARF_FRAME_REGISTERS
 317 #define DWARF_FRAME_REGISTERS FIRST_PSEUDO_REGISTER
 318 #endif
 319
 320 /* How to renumber registers for dbx and gdb.  If not defined, assume
 321    no renumbering is necessary.  */
 322
 323 #ifndef DBX_REGISTER_NUMBER
 324 #define DBX_REGISTER_NUMBER(REGNO) (REGNO)
 325 #endif
 326
 327 /* Default sizes for base C types.  If the sizes are different for
 328    your target, you should override these values by defining the
 329    appropriate symbols in your tm.h file.  */
 330
 331 #ifndef BITS_PER_UNIT
 332 #define BITS_PER_UNIT 8
 333 #endif
 334
 335 #ifndef BITS_PER_WORD
 336 #define BITS_PER_WORD (BITS_PER_UNIT * UNITS_PER_WORD)
 337 #endif
 338
 339 #ifndef CHAR_TYPE_SIZE
 340 #define CHAR_TYPE_SIZE BITS_PER_UNIT
 341 #endif
 342
 343 #ifndef BOOL_TYPE_SIZE
 344 /* `bool' has size and alignment `1', on almost all platforms.  */
 345 #define BOOL_TYPE_SIZE CHAR_TYPE_SIZE
 346 #endif
 347
 348 #ifndef SHORT_TYPE_SIZE
 349 #define SHORT_TYPE_SIZE (BITS_PER_UNIT * MIN ((UNITS_PER_WORD + 1) / 2, 2))
 350 #endif
 351
 352 #ifndef INT_TYPE_SIZE
 353 #define INT_TYPE_SIZE BITS_PER_WORD
 354 #endif
 355
 356 #ifndef LONG_TYPE_SIZE
 357 #define LONG_TYPE_SIZE BITS_PER_WORD
 358 #endif
 359
 360 #ifndef LONG_LONG_TYPE_SIZE
 361 #define LONG_LONG_TYPE_SIZE (BITS_PER_WORD * 2)
 362 #endif
 363
 364 #ifndef WCHAR_TYPE_SIZE
 365 #define WCHAR_TYPE_SIZE INT_TYPE_SIZE
 366 #endif
 367
 368 #ifndef FLOAT_TYPE_SIZE
 369 #define FLOAT_TYPE_SIZE BITS_PER_WORD
 370 #endif
 371
 372 #ifndef DOUBLE_TYPE_SIZE
 373 #define DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
 374 #endif
 375
 376 #ifndef LONG_DOUBLE_TYPE_SIZE
 377 #define LONG_DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
 378 #endif
 379
 380 /* Width in bits of a pointer.  Mind the value of the macro `Pmode'.  */
 381 #ifndef POINTER_SIZE
 382 #define POINTER_SIZE BITS_PER_WORD
 383 #endif
 384
 385 #ifndef BUILD_VA_LIST_TYPE
 386 #define BUILD_VA_LIST_TYPE(X) ((X) = ptr_type_node)
 387 #endif
 388
 389 #ifndef PIC_OFFSET_TABLE_REGNUM
 390 #define PIC_OFFSET_TABLE_REGNUM INVALID_REGNUM
 391 #endif
 392
 393 /* By default, the preprocessor should be invoked the same way in C++
 394    as in C.  */
 395 #ifndef CPLUSPLUS_CPP_SPEC
 396 #ifdef CPP_SPEC
 397 #define CPLUSPLUS_CPP_SPEC CPP_SPEC
 398 #endif
 399 #endif
 400
 401 #ifndef ACCUMULATE_OUTGOING_ARGS
 402 #define ACCUMULATE_OUTGOING_ARGS 0
 403 #endif
 404
 405 /* Supply a default definition for PUSH_ARGS.  */
 406 #ifndef PUSH_ARGS
 407 #ifdef PUSH_ROUNDING
 408 #define PUSH_ARGS       !ACCUMULATE_OUTGOING_ARGS
 409 #else
 410 #define PUSH_ARGS       0
 411 #endif
 412 #endif
 413
 414 /* Decide whether a function's arguments should be processed
 415    from first to last or from last to first.
 416
 417    They should if the stack and args grow in opposite directions, but
 418    only if we have push insns.  */
 419
 420 #ifdef PUSH_ROUNDING
 421
 422 #ifndef PUSH_ARGS_REVERSED
 423 #if defined (STACK_GROWS_DOWNWARD) != defined (ARGS_GROW_DOWNWARD)
 424 #define PUSH_ARGS_REVERSED  PUSH_ARGS
 425 #endif
 426 #endif
 427
 428 #endif
 429
 430 #ifndef PUSH_ARGS_REVERSED
 431 #define PUSH_ARGS_REVERSED 0
 432 #endif
 433
 434 /* If PREFERRED_STACK_BOUNDARY is not defined, set it to STACK_BOUNDARY.
 435    STACK_BOUNDARY is required.  */
 436 #ifndef PREFERRED_STACK_BOUNDARY
 437 #define PREFERRED_STACK_BOUNDARY STACK_BOUNDARY
 438 #endif
 439
 440 /* By default, the C++ compiler will use function addresses in the
 441    vtable entries.  Setting this nonzero tells the compiler to use
 442    function descriptors instead.  The value of this macro says how
 443    many words wide the descriptor is (normally 2).  It is assumed
 444    that the address of a function descriptor may be treated as a
 445    pointer to a function.  */
 446 #ifndef TARGET_VTABLE_USES_DESCRIPTORS
 447 #define TARGET_VTABLE_USES_DESCRIPTORS 0
 448 #endif
 449
 450 /* By default, the vtable entries are void pointers, the so the alignment
 451    is the same as pointer alignment.  The value of this macro specifies
 452    the alignment of the vtable entry in bits.  It should be defined only
 453    when special alignment is necessary.  */
 454 #ifndef TARGET_VTABLE_ENTRY_ALIGN
 455 #define TARGET_VTABLE_ENTRY_ALIGN POINTER_SIZE
 456 #endif
 457
 458 /* There are a few non-descriptor entries in the vtable at offsets below
 459    zero.  If these entries must be padded (say, to preserve the alignment
 460    specified by TARGET_VTABLE_ENTRY_ALIGN), set this to the number of
 461    words in each data entry.  */
 462 #ifndef TARGET_VTABLE_DATA_ENTRY_DISTANCE
 463 #define TARGET_VTABLE_DATA_ENTRY_DISTANCE 1
 464 #endif
 465
 466 /* Select a format to encode pointers in exception handling data.  We
 467    prefer those that result in fewer dynamic relocations.  Assume no
 468    special support here and encode direct references.  */
 469 #ifndef ASM_PREFERRED_EH_DATA_FORMAT
 470 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE,GLOBAL)  DW_EH_PE_absptr
 471 #endif
 472
 473 /* By default, the C++ compiler will use the lowest bit of the pointer
 474    to function to indicate a pointer-to-member-function points to a
 475    virtual member function.  However, if FUNCTION_BOUNDARY indicates
 476    function addresses aren't always even, the lowest bit of the delta
 477    field will be used.  */
 478 #ifndef TARGET_PTRMEMFUNC_VBIT_LOCATION
 479 #define TARGET_PTRMEMFUNC_VBIT_LOCATION \
 480   (FUNCTION_BOUNDARY >= 2 * BITS_PER_UNIT \
 481    ? ptrmemfunc_vbit_in_pfn : ptrmemfunc_vbit_in_delta)
 482 #endif
 483
 484 #ifndef DEFAULT_GDB_EXTENSIONS
 485 #define DEFAULT_GDB_EXTENSIONS 1
 486 #endif
 487
 488 /* If more than one debugging type is supported, you must define
 489    PREFERRED_DEBUGGING_TYPE to choose a format in a system-dependent way.
 490
 491    This is one long line cause VAXC can't handle a \-newline.  */
 492 #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))
 493 #ifndef PREFERRED_DEBUGGING_TYPE
 494 You Lose!  You must define PREFERRED_DEBUGGING_TYPE!
 495 #endif /* no PREFERRED_DEBUGGING_TYPE */
 496 #else /* Only one debugging format supported.  Define PREFERRED_DEBUGGING_TYPE
 497          so other code needn't care.  */
 498 #ifdef DBX_DEBUGGING_INFO
 499 #define PREFERRED_DEBUGGING_TYPE DBX_DEBUG
 500 #endif
 501 #ifdef SDB_DEBUGGING_INFO
 502 #define PREFERRED_DEBUGGING_TYPE SDB_DEBUG
 503 #endif
 504 #ifdef DWARF_DEBUGGING_INFO
 505 #define PREFERRED_DEBUGGING_TYPE DWARF_DEBUG
 506 #endif
 507 #ifdef DWARF2_DEBUGGING_INFO
 508 #define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
 509 #endif
 510 #ifdef VMS_DEBUGGING_INFO
 511 #define PREFERRED_DEBUGGING_TYPE VMS_AND_DWARF2_DEBUG
 512 #endif
 513 #ifdef XCOFF_DEBUGGING_INFO
 514 #define PREFERRED_DEBUGGING_TYPE XCOFF_DEBUG
 515 #endif
 516 #endif /* More than one debugger format enabled.  */
 517
 518 /* If still not defined, must have been because no debugging formats
 519    are supported.  */
 520 #ifndef PREFERRED_DEBUGGING_TYPE
 521 #define PREFERRED_DEBUGGING_TYPE NO_DEBUG
 522 #endif
 523
 524 /* Define codes for all the float formats that we know of.  */
 525 #define UNKNOWN_FLOAT_FORMAT 0
 526 #define IEEE_FLOAT_FORMAT 1
 527 #define VAX_FLOAT_FORMAT 2
 528 #define IBM_FLOAT_FORMAT 3
 529 #define C4X_FLOAT_FORMAT 4
 530
 531 /* Default to IEEE float if not specified.  Nearly all machines use it.  */
 532 #ifndef TARGET_FLOAT_FORMAT
 533 #define TARGET_FLOAT_FORMAT     IEEE_FLOAT_FORMAT
 534 #endif
 535
 536 /* Determine the register class for registers suitable to be the base
 537    address register in a MEM.  Allow the choice to be dependent upon
 538    the mode of the memory access.  */
 539 #ifndef MODE_BASE_REG_CLASS
 540 #define MODE_BASE_REG_CLASS(MODE) BASE_REG_CLASS
 541 #endif
 542
 543 #ifndef LARGEST_EXPONENT_IS_NORMAL
 544 #define LARGEST_EXPONENT_IS_NORMAL(SIZE) 0
 545 #endif
 546
 547 #ifndef ROUND_TOWARDS_ZERO
 548 #define ROUND_TOWARDS_ZERO 0
 549 #endif
 550
 551 #ifndef MODE_HAS_NANS
 552 #define MODE_HAS_NANS(MODE)                                     \
 553   (FLOAT_MODE_P (MODE)                                          \
 554    && TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT                  \
 555    && !LARGEST_EXPONENT_IS_NORMAL (GET_MODE_BITSIZE (MODE)))
 556 #endif
 557
 558 #ifndef MODE_HAS_INFINITIES
 559 #define MODE_HAS_INFINITIES(MODE)                               \
 560   (FLOAT_MODE_P (MODE)                                          \
 561    && TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT                  \
 562    && !LARGEST_EXPONENT_IS_NORMAL (GET_MODE_BITSIZE (MODE)))
 563 #endif
 564
 565 #ifndef MODE_HAS_SIGNED_ZEROS
 566 #define MODE_HAS_SIGNED_ZEROS(MODE) \
 567   (FLOAT_MODE_P (MODE) && TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT)
 568 #endif
 569
 570 #ifndef MODE_HAS_SIGN_DEPENDENT_ROUNDING
 571 #define MODE_HAS_SIGN_DEPENDENT_ROUNDING(MODE)                  \
 572   (FLOAT_MODE_P (MODE)                                          \
 573    && TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT                  \
 574    && !ROUND_TOWARDS_ZERO)
 575 #endif
 576
 577 #ifndef FLOAT_LIB_COMPARE_RETURNS_BOOL
 578 #define FLOAT_LIB_COMPARE_RETURNS_BOOL(MODE, COMPARISON) false
 579 #endif
 580
 581 /* If FLOAT_WORDS_BIG_ENDIAN is not defined in the header files,
 582    then the word-endianness is the same as for integers.  */
 583 #ifndef FLOAT_WORDS_BIG_ENDIAN
 584 #define FLOAT_WORDS_BIG_ENDIAN WORDS_BIG_ENDIAN
 585 #endif
 586
 587 #ifndef TARGET_FLT_EVAL_METHOD
 588 #define TARGET_FLT_EVAL_METHOD 0
 589 #endif
 590
 591 #ifndef HOT_TEXT_SECTION_NAME
 592 #define HOT_TEXT_SECTION_NAME "text.hot"
 593 #endif
 594
 595 #ifndef UNLIKELY_EXECUTED_TEXT_SECTION_NAME
 596 #define UNLIKELY_EXECUTED_TEXT_SECTION_NAME "text.unlikely"
 597 #endif
 598
 599 #ifndef VECTOR_MODE_SUPPORTED_P
 600 #define VECTOR_MODE_SUPPORTED_P(MODE) 0
 601 #endif
 602
 603 /* Determine whether __cxa_atexit, rather than atexit, is used to
 604    register C++ destructors for local statics and global objects.  */
 605 #ifndef DEFAULT_USE_CXA_ATEXIT
 606 #define DEFAULT_USE_CXA_ATEXIT 0
 607 #endif
 608
 609 /* Determine whether extra constraint letter should be handled
 610    via address reload (like 'o').  */
 611 #ifndef EXTRA_MEMORY_CONSTRAINT
 612 #define EXTRA_MEMORY_CONSTRAINT(C,STR) 0
 613 #endif
 614
 615 /* Determine whether extra constraint letter should be handled
 616    as an address (like 'p').  */
 617 #ifndef EXTRA_ADDRESS_CONSTRAINT
 618 #define EXTRA_ADDRESS_CONSTRAINT(C,STR) 0
 619 #endif
 620
 621 /* When a port defines CONSTRAINT_LEN, it should use DEFAULT_CONSTRAINT_LEN
 622    for all the characters that it does not want to change, so things like the
 623   'length' of a digit in a matching constraint is an implementation detail,
 624    and not part of the interface.  */
 625 #define DEFAULT_CONSTRAINT_LEN(C,STR) 1
 626
 627 #ifndef CONSTRAINT_LEN
 628 #define CONSTRAINT_LEN(C,STR) DEFAULT_CONSTRAINT_LEN (C, STR)
 629 #endif
 630
 631 #if defined (CONST_OK_FOR_LETTER_P) && ! defined (CONST_OK_FOR_CONSTRAINT_P)
 632 #define CONST_OK_FOR_CONSTRAINT_P(VAL,C,STR) CONST_OK_FOR_LETTER_P (VAL, C)
 633 #endif
 634
 635 #if defined (CONST_DOUBLE_OK_FOR_LETTER_P) && ! defined (CONST_DOUBLE_OK_FOR_CONSTRAINT_P)
 636 #define CONST_DOUBLE_OK_FOR_CONSTRAINT_P(OP,C,STR) \
 637   CONST_DOUBLE_OK_FOR_LETTER_P (OP, C)
 638 #endif
 639
 640 #ifndef REG_CLASS_FROM_CONSTRAINT
 641 #define REG_CLASS_FROM_CONSTRAINT(C,STR) REG_CLASS_FROM_LETTER (C)
 642 #endif
 643
 644 #if defined (EXTRA_CONSTRAINT) && ! defined (EXTRA_CONSTRAINT_STR)
 645 #define EXTRA_CONSTRAINT_STR(OP, C,STR) EXTRA_CONSTRAINT (OP, C)
 646 #endif
 647
 648 #ifndef REGISTER_MOVE_COST
 649 #define REGISTER_MOVE_COST(m, x, y) 2
 650 #endif
 651
 652 /* Determine whether the the entire c99 runtime
 653    is present in the runtime library.  */
 654 #ifndef TARGET_C99_FUNCTIONS
 655 #define TARGET_C99_FUNCTIONS 0
 656 #endif
 657
 658 /* Indicate that CLZ and CTZ are undefined at zero.  */
 659 #ifndef CLZ_DEFINED_VALUE_AT_ZERO
 660 #define CLZ_DEFINED_VALUE_AT_ZERO(MODE, VALUE)  0
 661 #endif
 662 #ifndef CTZ_DEFINED_VALUE_AT_ZERO
 663 #define CTZ_DEFINED_VALUE_AT_ZERO(MODE, VALUE)  0
 664 #endif
 665
 666 /* Provide a default value for STORE_FLAG_VALUE.  */
 667 #ifndef STORE_FLAG_VALUE
 668 #define STORE_FLAG_VALUE  1
 669 #endif
 670
 671 /* This macro is used to determine what the largest unit size that
 672    move_by_pieces can use is.  */
 673
 674 /* MOVE_MAX_PIECES is the number of bytes at a time which we can
 675    move efficiently, as opposed to  MOVE_MAX which is the maximum
 676    number of bytes we can move with a single instruction.  */
 677
 678 #ifndef MOVE_MAX_PIECES
 679 #define MOVE_MAX_PIECES   MOVE_MAX
 680 #endif
 681
 682 #ifndef STACK_POINTER_OFFSET
 683 #define STACK_POINTER_OFFSET    0
 684 #endif
 685
 686 /* How to print out a register name.  */
 687 #ifndef PRINT_REG
 688 #define PRINT_REG(RTX, CODE, FILE) \
 689   fprintf ((FILE), "%s", reg_names[REGNO (RTX)])
 690 #endif
 691
 692 #endif  /* ! GCC_DEFAULTS_H */