gcc/defaults.h

   1 /* Definitions of various defaults for tm.h macros.
   2    Copyright (C) 1992, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004
   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_CR 015
  43 #  define TARGET_DIGIT0 060
  44 #  define TARGET_ESC 033
  45 #  define TARGET_FF 014
  46 #  define TARGET_NEWLINE 012
  47 #  define TARGET_TAB 011
  48 #  define TARGET_VT 013
  49 #endif
  50
  51 /* Store in OUTPUT a string (made with alloca) containing an
  52    assembler-name for a local static variable or function named NAME.
  53    LABELNO is an integer which is different for each call.  */
  54
  55 #ifndef ASM_PN_FORMAT
  56 # ifndef NO_DOT_IN_LABEL
  57 #  define ASM_PN_FORMAT "%s.%lu"
  58 # else
  59 #  ifndef NO_DOLLAR_IN_LABEL
  60 #   define ASM_PN_FORMAT "%s$%lu"
  61 #  else
  62 #   define ASM_PN_FORMAT "__%s_%lu"
  63 #  endif
  64 # endif
  65 #endif /* ! ASM_PN_FORMAT */
  66
  67 #ifndef ASM_FORMAT_PRIVATE_NAME
  68 # define ASM_FORMAT_PRIVATE_NAME(OUTPUT, NAME, LABELNO) \
  69   do { const char *const name_ = (NAME); \
  70        char *const output_ = (OUTPUT) = alloca (strlen (name_) + 32);\
  71        sprintf (output_, ASM_PN_FORMAT, name_, (unsigned long)(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 / BITS_PER_UNIT, TRUE), FILE); \
  85      (*targetm.asm_out.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 the definition of a user-level label named
 144    NAME, such as the label on a static function or variable NAME.  */
 145
 146 #ifndef ASM_OUTPUT_LABEL
 147 #define ASM_OUTPUT_LABEL(FILE,NAME) \
 148   do { assemble_name ((FILE), (NAME)); fputs (":\n", (FILE)); } while (0)
 149 #endif
 150
 151 /* This is how to output a reference to a user-level label named NAME.  */
 152
 153 #ifndef ASM_OUTPUT_LABELREF
 154 #define ASM_OUTPUT_LABELREF(FILE,NAME)  asm_fprintf ((FILE), "%U%s", (NAME))
 155 #endif
 156
 157 /* Allow target to print debug info labels specially.  This is useful for
 158    VLIW targets, since debug info labels should go into the middle of
 159    instruction bundles instead of breaking them.  */
 160
 161 #ifndef ASM_OUTPUT_DEBUG_LABEL
 162 #define ASM_OUTPUT_DEBUG_LABEL(FILE, PREFIX, NUM) \
 163   (*targetm.asm_out.internal_label) (FILE, PREFIX, NUM)
 164 #endif
 165
 166 /* This is how we tell the assembler that a symbol is weak.  */
 167 #ifndef ASM_OUTPUT_WEAK_ALIAS
 168 #if defined (ASM_WEAKEN_LABEL) && defined (ASM_OUTPUT_DEF)
 169 #define ASM_OUTPUT_WEAK_ALIAS(STREAM, NAME, VALUE)      \
 170   do                                                    \
 171     {                                                   \
 172       ASM_WEAKEN_LABEL (STREAM, NAME);                  \
 173       if (VALUE)                                        \
 174         ASM_OUTPUT_DEF (STREAM, NAME, VALUE);           \
 175     }                                                   \
 176   while (0)
 177 #endif
 178 #endif
 179
 180 /* How to emit a .type directive.  */
 181 #ifndef ASM_OUTPUT_TYPE_DIRECTIVE
 182 #if defined TYPE_ASM_OP && defined TYPE_OPERAND_FMT
 183 #define ASM_OUTPUT_TYPE_DIRECTIVE(STREAM, NAME, TYPE)   \
 184   do                                                    \
 185     {                                                   \
 186       fputs (TYPE_ASM_OP, STREAM);                      \
 187       assemble_name (STREAM, NAME);                     \
 188       fputs (", ", STREAM);                             \
 189       fprintf (STREAM, TYPE_OPERAND_FMT, TYPE);         \
 190       putc ('\n', STREAM);                              \
 191     }                                                   \
 192   while (0)
 193 #endif
 194 #endif
 195
 196 /* How to emit a .size directive.  */
 197 #ifndef ASM_OUTPUT_SIZE_DIRECTIVE
 198 #ifdef SIZE_ASM_OP
 199 #define ASM_OUTPUT_SIZE_DIRECTIVE(STREAM, NAME, SIZE)   \
 200   do                                                    \
 201     {                                                   \
 202       HOST_WIDE_INT size_ = (SIZE);                     \
 203       fputs (SIZE_ASM_OP, STREAM);                      \
 204       assemble_name (STREAM, NAME);                     \
 205       fprintf (STREAM, ", " HOST_WIDE_INT_PRINT_DEC "\n", size_); \
 206     }                                                   \
 207   while (0)
 208
 209 #define ASM_OUTPUT_MEASURED_SIZE(STREAM, NAME)          \
 210   do                                                    \
 211     {                                                   \
 212       fputs (SIZE_ASM_OP, STREAM);                      \
 213       assemble_name (STREAM, NAME);                     \
 214       fputs (", .-", STREAM);                           \
 215       assemble_name (STREAM, NAME);                     \
 216       putc ('\n', STREAM);                              \
 217     }                                                   \
 218   while (0)
 219
 220 #endif
 221 #endif
 222
 223 /* This determines whether or not we support weak symbols.  */
 224 #ifndef SUPPORTS_WEAK
 225 #if defined (ASM_WEAKEN_LABEL) || defined (ASM_WEAKEN_DECL)
 226 #define SUPPORTS_WEAK 1
 227 #else
 228 #define SUPPORTS_WEAK 0
 229 #endif
 230 #endif
 231
 232 /* This determines whether or not we support link-once semantics.  */
 233 #ifndef SUPPORTS_ONE_ONLY
 234 #ifdef MAKE_DECL_ONE_ONLY
 235 #define SUPPORTS_ONE_ONLY 1
 236 #else
 237 #define SUPPORTS_ONE_ONLY 0
 238 #endif
 239 #endif
 240
 241 /* Determines whether explicit template instantiations should
 242    be given link-once semantics. The C++ ABI requires this
 243    macro to be nonzero; see the documentation. */
 244 #ifndef TARGET_EXPLICIT_INSTANTIATIONS_ONE_ONLY
 245 # define TARGET_EXPLICIT_INSTANTIATIONS_ONE_ONLY 1
 246 #endif
 247
 248 /* This determines whether or not we need linkonce unwind information */
 249 #ifndef TARGET_USES_WEAK_UNWIND_INFO
 250 #define TARGET_USES_WEAK_UNWIND_INFO 0
 251 #endif
 252
 253 /* By default, there is no prefix on user-defined symbols.  */
 254 #ifndef USER_LABEL_PREFIX
 255 #define USER_LABEL_PREFIX ""
 256 #endif
 257
 258 /* If the target supports weak symbols, define TARGET_ATTRIBUTE_WEAK to
 259    provide a weak attribute.  Else define it to nothing.
 260
 261    This would normally belong in ansidecl.h, but SUPPORTS_WEAK is
 262    not available at that time.
 263
 264    Note, this is only for use by target files which we know are to be
 265    compiled by GCC.  */
 266 #ifndef TARGET_ATTRIBUTE_WEAK
 267 # if SUPPORTS_WEAK
 268 #  define TARGET_ATTRIBUTE_WEAK __attribute__ ((weak))
 269 # else
 270 #  define TARGET_ATTRIBUTE_WEAK
 271 # endif
 272 #endif
 273
 274 /* This determines whether this target supports hidden visibility.
 275    This is a weaker condition than HAVE_GAS_HIDDEN, which probes for
 276    specific assembler syntax. */
 277 #ifndef TARGET_SUPPORTS_HIDDEN
 278 # ifdef HAVE_GAS_HIDDEN
 279 #  define TARGET_SUPPORTS_HIDDEN 1
 280 # else
 281 #  define TARGET_SUPPORTS_HIDDEN 0
 282 # endif
 283 #endif
 284
 285 /* Determines whether we may use common symbols to represent one-only
 286    semantics (a.k.a. "vague linkage"). */
 287 #ifndef USE_COMMON_FOR_ONE_ONLY
 288 # define USE_COMMON_FOR_ONE_ONLY 1
 289 #endif
 290
 291
 292 /* If the target supports init_priority C++ attribute, give
 293    SUPPORTS_INIT_PRIORITY a nonzero value.  */
 294 #ifndef SUPPORTS_INIT_PRIORITY
 295 #define SUPPORTS_INIT_PRIORITY 1
 296 #endif /* SUPPORTS_INIT_PRIORITY */
 297
 298 /* If duplicate library search directories can be removed from a
 299    linker command without changing the linker's semantics, give this
 300    symbol a nonzero.  */
 301 #ifndef LINK_ELIMINATE_DUPLICATE_LDIRECTORIES
 302 #define LINK_ELIMINATE_DUPLICATE_LDIRECTORIES 0
 303 #endif /* LINK_ELIMINATE_DUPLICATE_LDIRECTORIES */
 304
 305 /* If we have a definition of INCOMING_RETURN_ADDR_RTX, assume that
 306    the rest of the DWARF 2 frame unwind support is also provided.  */
 307 #if !defined (DWARF2_UNWIND_INFO) && defined (INCOMING_RETURN_ADDR_RTX)
 308 #define DWARF2_UNWIND_INFO 1
 309 #endif
 310
 311 /* If we have named sections, and we're using crtstuff to run ctors,
 312    use them for registering eh frame information.  */
 313 #if defined (TARGET_ASM_NAMED_SECTION) && DWARF2_UNWIND_INFO \
 314     && !defined(EH_FRAME_IN_DATA_SECTION)
 315 #ifndef EH_FRAME_SECTION_NAME
 316 #define EH_FRAME_SECTION_NAME ".eh_frame"
 317 #endif
 318 #endif
 319
 320 /* If we have named section and we support weak symbols, then use the
 321    .jcr section for recording java classes which need to be registered
 322    at program start-up time.  */
 323 #if defined (TARGET_ASM_NAMED_SECTION) && SUPPORTS_WEAK
 324 #ifndef JCR_SECTION_NAME
 325 #define JCR_SECTION_NAME ".jcr"
 326 #endif
 327 #endif
 328
 329 /* By default, we generate a label at the beginning and end of the
 330    text section, and compute the size of the text section by
 331    subtracting the two.  However, on some platforms that doesn't
 332    work, and we use the section itself, rather than a label at the
 333    beginning of it, to indicate the start of the section.  On such
 334    platforms, define this to zero.  */
 335 #ifndef DWARF2_GENERATE_TEXT_SECTION_LABEL
 336 #define DWARF2_GENERATE_TEXT_SECTION_LABEL 1
 337 #endif
 338
 339 /* Number of hardware registers that go into the DWARF-2 unwind info.
 340    If not defined, equals FIRST_PSEUDO_REGISTER  */
 341
 342 #ifndef DWARF_FRAME_REGISTERS
 343 #define DWARF_FRAME_REGISTERS FIRST_PSEUDO_REGISTER
 344 #endif
 345
 346 /* How to renumber registers for dbx and gdb.  If not defined, assume
 347    no renumbering is necessary.  */
 348
 349 #ifndef DBX_REGISTER_NUMBER
 350 #define DBX_REGISTER_NUMBER(REGNO) (REGNO)
 351 #endif
 352
 353 /* Default sizes for base C types.  If the sizes are different for
 354    your target, you should override these values by defining the
 355    appropriate symbols in your tm.h file.  */
 356
 357 #ifndef BITS_PER_UNIT
 358 #define BITS_PER_UNIT 8
 359 #endif
 360
 361 #ifndef BITS_PER_WORD
 362 #define BITS_PER_WORD (BITS_PER_UNIT * UNITS_PER_WORD)
 363 #endif
 364
 365 #ifndef CHAR_TYPE_SIZE
 366 #define CHAR_TYPE_SIZE BITS_PER_UNIT
 367 #endif
 368
 369 #ifndef BOOL_TYPE_SIZE
 370 /* `bool' has size and alignment `1', on almost all platforms.  */
 371 #define BOOL_TYPE_SIZE CHAR_TYPE_SIZE
 372 #endif
 373
 374 #ifndef SHORT_TYPE_SIZE
 375 #define SHORT_TYPE_SIZE (BITS_PER_UNIT * MIN ((UNITS_PER_WORD + 1) / 2, 2))
 376 #endif
 377
 378 #ifndef INT_TYPE_SIZE
 379 #define INT_TYPE_SIZE BITS_PER_WORD
 380 #endif
 381
 382 #ifndef LONG_TYPE_SIZE
 383 #define LONG_TYPE_SIZE BITS_PER_WORD
 384 #endif
 385
 386 #ifndef LONG_LONG_TYPE_SIZE
 387 #define LONG_LONG_TYPE_SIZE (BITS_PER_WORD * 2)
 388 #endif
 389
 390 #ifndef WCHAR_TYPE_SIZE
 391 #define WCHAR_TYPE_SIZE INT_TYPE_SIZE
 392 #endif
 393
 394 #ifndef FLOAT_TYPE_SIZE
 395 #define FLOAT_TYPE_SIZE BITS_PER_WORD
 396 #endif
 397
 398 #ifndef DOUBLE_TYPE_SIZE
 399 #define DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
 400 #endif
 401
 402 #ifndef LONG_DOUBLE_TYPE_SIZE
 403 #define LONG_DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
 404 #endif
 405
 406 /* Width in bits of a pointer.  Mind the value of the macro `Pmode'.  */
 407 #ifndef POINTER_SIZE
 408 #define POINTER_SIZE BITS_PER_WORD
 409 #endif
 410
 411 #ifndef PIC_OFFSET_TABLE_REGNUM
 412 #define PIC_OFFSET_TABLE_REGNUM INVALID_REGNUM
 413 #endif
 414
 415 /* By default, the preprocessor should be invoked the same way in C++
 416    as in C.  */
 417 #ifndef CPLUSPLUS_CPP_SPEC
 418 #ifdef CPP_SPEC
 419 #define CPLUSPLUS_CPP_SPEC CPP_SPEC
 420 #endif
 421 #endif
 422
 423 #ifndef ACCUMULATE_OUTGOING_ARGS
 424 #define ACCUMULATE_OUTGOING_ARGS 0
 425 #endif
 426
 427 /* Supply a default definition for PUSH_ARGS.  */
 428 #ifndef PUSH_ARGS
 429 #ifdef PUSH_ROUNDING
 430 #define PUSH_ARGS       !ACCUMULATE_OUTGOING_ARGS
 431 #else
 432 #define PUSH_ARGS       0
 433 #endif
 434 #endif
 435
 436 /* Decide whether a function's arguments should be processed
 437    from first to last or from last to first.
 438
 439    They should if the stack and args grow in opposite directions, but
 440    only if we have push insns.  */
 441
 442 #ifdef PUSH_ROUNDING
 443
 444 #ifndef PUSH_ARGS_REVERSED
 445 #if defined (STACK_GROWS_DOWNWARD) != defined (ARGS_GROW_DOWNWARD)
 446 #define PUSH_ARGS_REVERSED  PUSH_ARGS
 447 #endif
 448 #endif
 449
 450 #endif
 451
 452 #ifndef PUSH_ARGS_REVERSED
 453 #define PUSH_ARGS_REVERSED 0
 454 #endif
 455
 456 /* If PREFERRED_STACK_BOUNDARY is not defined, set it to STACK_BOUNDARY.
 457    STACK_BOUNDARY is required.  */
 458 #ifndef PREFERRED_STACK_BOUNDARY
 459 #define PREFERRED_STACK_BOUNDARY STACK_BOUNDARY
 460 #endif
 461
 462 /* By default, the C++ compiler will use function addresses in the
 463    vtable entries.  Setting this nonzero tells the compiler to use
 464    function descriptors instead.  The value of this macro says how
 465    many words wide the descriptor is (normally 2).  It is assumed
 466    that the address of a function descriptor may be treated as a
 467    pointer to a function.  */
 468 #ifndef TARGET_VTABLE_USES_DESCRIPTORS
 469 #define TARGET_VTABLE_USES_DESCRIPTORS 0
 470 #endif
 471
 472 /* By default, the vtable entries are void pointers, the so the alignment
 473    is the same as pointer alignment.  The value of this macro specifies
 474    the alignment of the vtable entry in bits.  It should be defined only
 475    when special alignment is necessary.  */
 476 #ifndef TARGET_VTABLE_ENTRY_ALIGN
 477 #define TARGET_VTABLE_ENTRY_ALIGN POINTER_SIZE
 478 #endif
 479
 480 /* There are a few non-descriptor entries in the vtable at offsets below
 481    zero.  If these entries must be padded (say, to preserve the alignment
 482    specified by TARGET_VTABLE_ENTRY_ALIGN), set this to the number of
 483    words in each data entry.  */
 484 #ifndef TARGET_VTABLE_DATA_ENTRY_DISTANCE
 485 #define TARGET_VTABLE_DATA_ENTRY_DISTANCE 1
 486 #endif
 487
 488 /* Decide whether it is safe to use a local alias for a virtual function
 489    when constructing thunks.  */
 490 #ifndef TARGET_USE_LOCAL_THUNK_ALIAS_P
 491 #ifdef ASM_OUTPUT_DEF
 492 #define TARGET_USE_LOCAL_THUNK_ALIAS_P(DECL) 1
 493 #else
 494 #define TARGET_USE_LOCAL_THUNK_ALIAS_P(DECL) 0
 495 #endif
 496 #endif
 497
 498 /* Select a format to encode pointers in exception handling data.  We
 499    prefer those that result in fewer dynamic relocations.  Assume no
 500    special support here and encode direct references.  */
 501 #ifndef ASM_PREFERRED_EH_DATA_FORMAT
 502 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE,GLOBAL)  DW_EH_PE_absptr
 503 #endif
 504
 505 /* By default, the C++ compiler will use the lowest bit of the pointer
 506    to function to indicate a pointer-to-member-function points to a
 507    virtual member function.  However, if FUNCTION_BOUNDARY indicates
 508    function addresses aren't always even, the lowest bit of the delta
 509    field will be used.  */
 510 #ifndef TARGET_PTRMEMFUNC_VBIT_LOCATION
 511 #define TARGET_PTRMEMFUNC_VBIT_LOCATION \
 512   (FUNCTION_BOUNDARY >= 2 * BITS_PER_UNIT \
 513    ? ptrmemfunc_vbit_in_pfn : ptrmemfunc_vbit_in_delta)
 514 #endif
 515
 516 #ifndef DEFAULT_GDB_EXTENSIONS
 517 #define DEFAULT_GDB_EXTENSIONS 1
 518 #endif
 519
 520 /* If more than one debugging type is supported, you must define
 521    PREFERRED_DEBUGGING_TYPE to choose a format in a system-dependent way.
 522
 523    This is one long line cause VAXC can't handle a \-newline.  */
 524 #if 1 < (defined (DBX_DEBUGGING_INFO) + defined (SDB_DEBUGGING_INFO) + defined (DWARF2_DEBUGGING_INFO) + defined (XCOFF_DEBUGGING_INFO) + defined (VMS_DEBUGGING_INFO))
 525 #ifndef PREFERRED_DEBUGGING_TYPE
 526 You Lose!  You must define PREFERRED_DEBUGGING_TYPE!
 527 #endif /* no PREFERRED_DEBUGGING_TYPE */
 528 #else /* Only one debugging format supported.  Define PREFERRED_DEBUGGING_TYPE
 529          so other code needn't care.  */
 530 #ifdef DBX_DEBUGGING_INFO
 531 #define PREFERRED_DEBUGGING_TYPE DBX_DEBUG
 532 #endif
 533 #ifdef SDB_DEBUGGING_INFO
 534 #define PREFERRED_DEBUGGING_TYPE SDB_DEBUG
 535 #endif
 536 #ifdef DWARF_DEBUGGING_INFO
 537 #define PREFERRED_DEBUGGING_TYPE DWARF_DEBUG
 538 #endif
 539 #ifdef DWARF2_DEBUGGING_INFO
 540 #define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
 541 #endif
 542 #ifdef VMS_DEBUGGING_INFO
 543 #define PREFERRED_DEBUGGING_TYPE VMS_AND_DWARF2_DEBUG
 544 #endif
 545 #ifdef XCOFF_DEBUGGING_INFO
 546 #define PREFERRED_DEBUGGING_TYPE XCOFF_DEBUG
 547 #endif
 548 #endif /* More than one debugger format enabled.  */
 549
 550 /* If still not defined, must have been because no debugging formats
 551    are supported.  */
 552 #ifndef PREFERRED_DEBUGGING_TYPE
 553 #define PREFERRED_DEBUGGING_TYPE NO_DEBUG
 554 #endif
 555
 556 /* Define codes for all the float formats that we know of.  */
 557 #define UNKNOWN_FLOAT_FORMAT 0
 558 #define IEEE_FLOAT_FORMAT 1
 559 #define VAX_FLOAT_FORMAT 2
 560 #define IBM_FLOAT_FORMAT 3
 561 #define C4X_FLOAT_FORMAT 4
 562
 563 /* Default to IEEE float if not specified.  Nearly all machines use it.  */
 564 #ifndef TARGET_FLOAT_FORMAT
 565 #define TARGET_FLOAT_FORMAT     IEEE_FLOAT_FORMAT
 566 #endif
 567
 568 /* Determine the register class for registers suitable to be the base
 569    address register in a MEM.  Allow the choice to be dependent upon
 570    the mode of the memory access.  */
 571 #ifndef MODE_BASE_REG_CLASS
 572 #define MODE_BASE_REG_CLASS(MODE) BASE_REG_CLASS
 573 #endif
 574
 575 #ifndef LARGEST_EXPONENT_IS_NORMAL
 576 #define LARGEST_EXPONENT_IS_NORMAL(SIZE) 0
 577 #endif
 578
 579 #ifndef ROUND_TOWARDS_ZERO
 580 #define ROUND_TOWARDS_ZERO 0
 581 #endif
 582
 583 #ifndef MODE_HAS_NANS
 584 #define MODE_HAS_NANS(MODE)                                     \
 585   (FLOAT_MODE_P (MODE)                                          \
 586    && TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT                  \
 587    && !LARGEST_EXPONENT_IS_NORMAL (GET_MODE_BITSIZE (MODE)))
 588 #endif
 589
 590 #ifndef MODE_HAS_INFINITIES
 591 #define MODE_HAS_INFINITIES(MODE)                               \
 592   (FLOAT_MODE_P (MODE)                                          \
 593    && TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT                  \
 594    && !LARGEST_EXPONENT_IS_NORMAL (GET_MODE_BITSIZE (MODE)))
 595 #endif
 596
 597 #ifndef MODE_HAS_SIGNED_ZEROS
 598 #define MODE_HAS_SIGNED_ZEROS(MODE) \
 599   (FLOAT_MODE_P (MODE) && TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT)
 600 #endif
 601
 602 #ifndef MODE_HAS_SIGN_DEPENDENT_ROUNDING
 603 #define MODE_HAS_SIGN_DEPENDENT_ROUNDING(MODE)                  \
 604   (FLOAT_MODE_P (MODE)                                          \
 605    && TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT                  \
 606    && !ROUND_TOWARDS_ZERO)
 607 #endif
 608
 609 #ifndef FLOAT_LIB_COMPARE_RETURNS_BOOL
 610 #define FLOAT_LIB_COMPARE_RETURNS_BOOL(MODE, COMPARISON) false
 611 #endif
 612
 613 /* If FLOAT_WORDS_BIG_ENDIAN is not defined in the header files,
 614    then the word-endianness is the same as for integers.  */
 615 #ifndef FLOAT_WORDS_BIG_ENDIAN
 616 #define FLOAT_WORDS_BIG_ENDIAN WORDS_BIG_ENDIAN
 617 #endif
 618
 619 #ifndef TARGET_FLT_EVAL_METHOD
 620 #define TARGET_FLT_EVAL_METHOD 0
 621 #endif
 622
 623 #ifndef HOT_TEXT_SECTION_NAME
 624 #define HOT_TEXT_SECTION_NAME ".text.hot"
 625 #endif
 626
 627 #ifndef NORMAL_TEXT_SECTION_NAME
 628 #define NORMAL_TEXT_SECTION_NAME ".text"
 629 #endif
 630
 631 #ifndef UNLIKELY_EXECUTED_TEXT_SECTION_NAME
 632 #define UNLIKELY_EXECUTED_TEXT_SECTION_NAME ".text.unlikely"
 633 #endif
 634
 635 #ifndef HAS_LONG_COND_BRANCH
 636 #define HAS_LONG_COND_BRANCH 0
 637 #endif
 638
 639 #ifndef HAS_LONG_UNCOND_BRANCH
 640 #define HAS_LONG_UNCOND_BRANCH 0
 641 #endif
 642
 643 #ifndef VECTOR_MODE_SUPPORTED_P
 644 #define VECTOR_MODE_SUPPORTED_P(MODE) 0
 645 #endif
 646
 647 /* Determine whether __cxa_atexit, rather than atexit, is used to
 648    register C++ destructors for local statics and global objects.  */
 649 #ifndef DEFAULT_USE_CXA_ATEXIT
 650 #define DEFAULT_USE_CXA_ATEXIT 0
 651 #endif
 652
 653 /* Determine whether extra constraint letter should be handled
 654    via address reload (like 'o').  */
 655 #ifndef EXTRA_MEMORY_CONSTRAINT
 656 #define EXTRA_MEMORY_CONSTRAINT(C,STR) 0
 657 #endif
 658
 659 /* Determine whether extra constraint letter should be handled
 660    as an address (like 'p').  */
 661 #ifndef EXTRA_ADDRESS_CONSTRAINT
 662 #define EXTRA_ADDRESS_CONSTRAINT(C,STR) 0
 663 #endif
 664
 665 /* When a port defines CONSTRAINT_LEN, it should use DEFAULT_CONSTRAINT_LEN
 666    for all the characters that it does not want to change, so things like the
 667   'length' of a digit in a matching constraint is an implementation detail,
 668    and not part of the interface.  */
 669 #define DEFAULT_CONSTRAINT_LEN(C,STR) 1
 670
 671 #ifndef CONSTRAINT_LEN
 672 #define CONSTRAINT_LEN(C,STR) DEFAULT_CONSTRAINT_LEN (C, STR)
 673 #endif
 674
 675 #if defined (CONST_OK_FOR_LETTER_P) && ! defined (CONST_OK_FOR_CONSTRAINT_P)
 676 #define CONST_OK_FOR_CONSTRAINT_P(VAL,C,STR) CONST_OK_FOR_LETTER_P (VAL, C)
 677 #endif
 678
 679 #if defined (CONST_DOUBLE_OK_FOR_LETTER_P) && ! defined (CONST_DOUBLE_OK_FOR_CONSTRAINT_P)
 680 #define CONST_DOUBLE_OK_FOR_CONSTRAINT_P(OP,C,STR) \
 681   CONST_DOUBLE_OK_FOR_LETTER_P (OP, C)
 682 #endif
 683
 684 #ifndef REG_CLASS_FROM_CONSTRAINT
 685 #define REG_CLASS_FROM_CONSTRAINT(C,STR) REG_CLASS_FROM_LETTER (C)
 686 #endif
 687
 688 #if defined (EXTRA_CONSTRAINT) && ! defined (EXTRA_CONSTRAINT_STR)
 689 #define EXTRA_CONSTRAINT_STR(OP, C,STR) EXTRA_CONSTRAINT (OP, C)
 690 #endif
 691
 692 #ifndef REGISTER_MOVE_COST
 693 #define REGISTER_MOVE_COST(m, x, y) 2
 694 #endif
 695
 696 /* Determine whether the the entire c99 runtime
 697    is present in the runtime library.  */
 698 #ifndef TARGET_C99_FUNCTIONS
 699 #define TARGET_C99_FUNCTIONS 0
 700 #endif
 701
 702 /* Indicate that CLZ and CTZ are undefined at zero.  */
 703 #ifndef CLZ_DEFINED_VALUE_AT_ZERO
 704 #define CLZ_DEFINED_VALUE_AT_ZERO(MODE, VALUE)  0
 705 #endif
 706 #ifndef CTZ_DEFINED_VALUE_AT_ZERO
 707 #define CTZ_DEFINED_VALUE_AT_ZERO(MODE, VALUE)  0
 708 #endif
 709
 710 /* Provide a default value for STORE_FLAG_VALUE.  */
 711 #ifndef STORE_FLAG_VALUE
 712 #define STORE_FLAG_VALUE  1
 713 #endif
 714
 715 /* This macro is used to determine what the largest unit size that
 716    move_by_pieces can use is.  */
 717
 718 /* MOVE_MAX_PIECES is the number of bytes at a time which we can
 719    move efficiently, as opposed to  MOVE_MAX which is the maximum
 720    number of bytes we can move with a single instruction.  */
 721
 722 #ifndef MOVE_MAX_PIECES
 723 #define MOVE_MAX_PIECES   MOVE_MAX
 724 #endif
 725
 726 #ifndef STACK_POINTER_OFFSET
 727 #define STACK_POINTER_OFFSET    0
 728 #endif
 729
 730 #ifndef LOCAL_REGNO
 731 #define LOCAL_REGNO(REGNO)  0
 732 #endif
 733
 734 /* EXIT_IGNORE_STACK should be nonzero if, when returning from a function,
 735    the stack pointer does not matter.  The value is tested only in
 736    functions that have frame pointers.  */
 737 #ifndef EXIT_IGNORE_STACK
 738 #define EXIT_IGNORE_STACK 0
 739 #endif
 740
 741 /* Assume that case vectors are not pc-relative.  */
 742 #ifndef CASE_VECTOR_PC_RELATIVE
 743 #define CASE_VECTOR_PC_RELATIVE 0
 744 #endif
 745
 746 /* Register mappings for target machines without register windows.  */
 747 #ifndef INCOMING_REGNO
 748 #define INCOMING_REGNO(N) (N)
 749 #endif
 750
 751 #ifndef OUTGOING_REGNO
 752 #define OUTGOING_REGNO(N) (N)
 753 #endif
 754
 755 #ifndef SHIFT_COUNT_TRUNCATED
 756 #define SHIFT_COUNT_TRUNCATED 0
 757 #endif
 758
 759 #ifndef LEGITIMIZE_ADDRESS
 760 #define LEGITIMIZE_ADDRESS(X, OLDX, MODE, WIN)
 761 #endif
 762
 763 #ifndef REVERSIBLE_CC_MODE
 764 #define REVERSIBLE_CC_MODE(MODE) 0
 765 #endif
 766
 767 #endif  /* ! GCC_DEFAULTS_H */