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) = \
  71          (char *) alloca (strlen (name_) + 32); \
  72        sprintf (output_, ASM_PN_FORMAT, name_, (unsigned long)(LABELNO)); \
  73   } while (0)
  74 #endif
  75
  76 #ifndef ASM_STABD_OP
  77 #define ASM_STABD_OP "\t.stabd\t"
  78 #endif
  79
  80 /* This is how to output an element of a case-vector that is absolute.
  81    Some targets don't use this, but we have to define it anyway.  */
  82
  83 #ifndef ASM_OUTPUT_ADDR_VEC_ELT
  84 #define ASM_OUTPUT_ADDR_VEC_ELT(FILE, VALUE)  \
  85 do { fputs (integer_asm_op (POINTER_SIZE / BITS_PER_UNIT, TRUE), FILE); \
  86      (*targetm.asm_out.internal_label) (FILE, "L", (VALUE));                    \
  87      fputc ('\n', FILE);                                                \
  88    } while (0)
  89 #endif
  90
  91 /* Choose a reasonable default for ASM_OUTPUT_ASCII.  */
  92
  93 #ifndef ASM_OUTPUT_ASCII
  94 #define ASM_OUTPUT_ASCII(MYFILE, MYSTRING, MYLENGTH) \
  95   do {                                                                        \
  96     FILE *_hide_asm_out_file = (MYFILE);                                      \
  97     const unsigned char *_hide_p = (const unsigned char *) (MYSTRING);        \
  98     int _hide_thissize = (MYLENGTH);                                          \
  99     {                                                                         \
 100       FILE *asm_out_file = _hide_asm_out_file;                                \
 101       const unsigned char *p = _hide_p;                                       \
 102       int thissize = _hide_thissize;                                          \
 103       int i;                                                                  \
 104       fprintf (asm_out_file, "\t.ascii \"");                                  \
 105                                                                               \
 106       for (i = 0; i < thissize; i++)                                          \
 107         {                                                                     \
 108           int c = p[i];                                                       \
 109           if (c == '\"' || c == '\\')                                         \
 110             putc ('\\', asm_out_file);                                        \
 111           if (ISPRINT(c))                                                     \
 112             putc (c, asm_out_file);                                           \
 113           else                                                                \
 114             {                                                                 \
 115               fprintf (asm_out_file, "\\%o", c);                              \
 116               /* After an octal-escape, if a digit follows,                   \
 117                  terminate one string constant and start another.             \
 118                  The VAX assembler fails to stop reading the escape           \
 119                  after three digits, so this is the only way we               \
 120                  can get it to parse the data properly.  */                   \
 121               if (i < thissize - 1 && ISDIGIT(p[i + 1]))                      \
 122                 fprintf (asm_out_file, "\"\n\t.ascii \"");                    \
 123           }                                                                   \
 124         }                                                                     \
 125       fprintf (asm_out_file, "\"\n");                                         \
 126     }                                                                         \
 127   }                                                                           \
 128   while (0)
 129 #endif
 130
 131 /* This is how we tell the assembler to equate two values.  */
 132 #ifdef SET_ASM_OP
 133 #ifndef ASM_OUTPUT_DEF
 134 #define ASM_OUTPUT_DEF(FILE,LABEL1,LABEL2)                              \
 135  do {   fprintf ((FILE), "%s", SET_ASM_OP);                             \
 136         assemble_name (FILE, LABEL1);                                   \
 137         fprintf (FILE, ",");                                            \
 138         assemble_name (FILE, LABEL2);                                   \
 139         fprintf (FILE, "\n");                                           \
 140   } while (0)
 141 #endif
 142 #endif
 143
 144 /* This is how to output the definition of a user-level label named
 145    NAME, such as the label on a static function or variable NAME.  */
 146
 147 #ifndef ASM_OUTPUT_LABEL
 148 #define ASM_OUTPUT_LABEL(FILE,NAME) \
 149   do { assemble_name ((FILE), (NAME)); fputs (":\n", (FILE)); } while (0)
 150 #endif
 151
 152 /* This is how to output a reference to a user-level label named NAME.  */
 153
 154 #ifndef ASM_OUTPUT_LABELREF
 155 #define ASM_OUTPUT_LABELREF(FILE,NAME)  asm_fprintf ((FILE), "%U%s", (NAME))
 156 #endif
 157
 158 /* Allow target to print debug info labels specially.  This is useful for
 159    VLIW targets, since debug info labels should go into the middle of
 160    instruction bundles instead of breaking them.  */
 161
 162 #ifndef ASM_OUTPUT_DEBUG_LABEL
 163 #define ASM_OUTPUT_DEBUG_LABEL(FILE, PREFIX, NUM) \
 164   (*targetm.asm_out.internal_label) (FILE, PREFIX, NUM)
 165 #endif
 166
 167 /* This is how we tell the assembler that a symbol is weak.  */
 168 #ifndef ASM_OUTPUT_WEAK_ALIAS
 169 #if defined (ASM_WEAKEN_LABEL) && defined (ASM_OUTPUT_DEF)
 170 #define ASM_OUTPUT_WEAK_ALIAS(STREAM, NAME, VALUE)      \
 171   do                                                    \
 172     {                                                   \
 173       ASM_WEAKEN_LABEL (STREAM, NAME);                  \
 174       if (VALUE)                                        \
 175         ASM_OUTPUT_DEF (STREAM, NAME, VALUE);           \
 176     }                                                   \
 177   while (0)
 178 #endif
 179 #endif
 180
 181 /* How to emit a .type directive.  */
 182 #ifndef ASM_OUTPUT_TYPE_DIRECTIVE
 183 #if defined TYPE_ASM_OP && defined TYPE_OPERAND_FMT
 184 #define ASM_OUTPUT_TYPE_DIRECTIVE(STREAM, NAME, TYPE)   \
 185   do                                                    \
 186     {                                                   \
 187       fputs (TYPE_ASM_OP, STREAM);                      \
 188       assemble_name (STREAM, NAME);                     \
 189       fputs (", ", STREAM);                             \
 190       fprintf (STREAM, TYPE_OPERAND_FMT, TYPE);         \
 191       putc ('\n', STREAM);                              \
 192     }                                                   \
 193   while (0)
 194 #endif
 195 #endif
 196
 197 /* How to emit a .size directive.  */
 198 #ifndef ASM_OUTPUT_SIZE_DIRECTIVE
 199 #ifdef SIZE_ASM_OP
 200 #define ASM_OUTPUT_SIZE_DIRECTIVE(STREAM, NAME, SIZE)   \
 201   do                                                    \
 202     {                                                   \
 203       HOST_WIDE_INT size_ = (SIZE);                     \
 204       fputs (SIZE_ASM_OP, STREAM);                      \
 205       assemble_name (STREAM, NAME);                     \
 206       fprintf (STREAM, ", " HOST_WIDE_INT_PRINT_DEC "\n", size_); \
 207     }                                                   \
 208   while (0)
 209
 210 #define ASM_OUTPUT_MEASURED_SIZE(STREAM, NAME)          \
 211   do                                                    \
 212     {                                                   \
 213       fputs (SIZE_ASM_OP, STREAM);                      \
 214       assemble_name (STREAM, NAME);                     \
 215       fputs (", .-", STREAM);                           \
 216       assemble_name (STREAM, NAME);                     \
 217       putc ('\n', STREAM);                              \
 218     }                                                   \
 219   while (0)
 220
 221 #endif
 222 #endif
 223
 224 /* This determines whether or not we support weak symbols.  */
 225 #ifndef SUPPORTS_WEAK
 226 #if defined (ASM_WEAKEN_LABEL) || defined (ASM_WEAKEN_DECL)
 227 #define SUPPORTS_WEAK 1
 228 #else
 229 #define SUPPORTS_WEAK 0
 230 #endif
 231 #endif
 232
 233 /* This determines whether or not we support link-once semantics.  */
 234 #ifndef SUPPORTS_ONE_ONLY
 235 #ifdef MAKE_DECL_ONE_ONLY
 236 #define SUPPORTS_ONE_ONLY 1
 237 #else
 238 #define SUPPORTS_ONE_ONLY 0
 239 #endif
 240 #endif
 241
 242 /* This determines whether weak symbols must be left out of a static
 243    archive's table of contents.  Defining this macro to be nonzero has
 244    the consequence that certain symbols will not be made weak that
 245    otherwise would be.  The C++ ABI requires this macro to be zero;
 246    see the documentation. */
 247 #ifndef TARGET_WEAK_NOT_IN_ARCHIVE_TOC
 248 #define TARGET_WEAK_NOT_IN_ARCHIVE_TOC 0
 249 #endif
 250
 251 /* This determines whether or not we need linkonce unwind information */
 252 #ifndef TARGET_USES_WEAK_UNWIND_INFO
 253 #define TARGET_USES_WEAK_UNWIND_INFO 0
 254 #endif
 255
 256 /* By default, there is no prefix on user-defined symbols.  */
 257 #ifndef USER_LABEL_PREFIX
 258 #define USER_LABEL_PREFIX ""
 259 #endif
 260
 261 /* If the target supports weak symbols, define TARGET_ATTRIBUTE_WEAK to
 262    provide a weak attribute.  Else define it to nothing.
 263
 264    This would normally belong in ansidecl.h, but SUPPORTS_WEAK is
 265    not available at that time.
 266
 267    Note, this is only for use by target files which we know are to be
 268    compiled by GCC.  */
 269 #ifndef TARGET_ATTRIBUTE_WEAK
 270 # if SUPPORTS_WEAK
 271 #  define TARGET_ATTRIBUTE_WEAK __attribute__ ((weak))
 272 # else
 273 #  define TARGET_ATTRIBUTE_WEAK
 274 # endif
 275 #endif
 276
 277 /* This determines whether this target supports hidden visibility.
 278    This is a weaker condition than HAVE_GAS_HIDDEN, which probes for
 279    specific assembler syntax.  */
 280 #ifndef TARGET_SUPPORTS_HIDDEN
 281 # ifdef HAVE_GAS_HIDDEN
 282 #  define TARGET_SUPPORTS_HIDDEN 1
 283 # else
 284 #  define TARGET_SUPPORTS_HIDDEN 0
 285 # endif
 286 #endif
 287
 288 /* Determines whether we may use common symbols to represent one-only
 289    semantics (a.k.a. "vague linkage").  */
 290 #ifndef USE_COMMON_FOR_ONE_ONLY
 291 # define USE_COMMON_FOR_ONE_ONLY 1
 292 #endif
 293
 294
 295 /* If the target supports init_priority C++ attribute, give
 296    SUPPORTS_INIT_PRIORITY a nonzero value.  */
 297 #ifndef SUPPORTS_INIT_PRIORITY
 298 #define SUPPORTS_INIT_PRIORITY 1
 299 #endif /* SUPPORTS_INIT_PRIORITY */
 300
 301 /* If duplicate library search directories can be removed from a
 302    linker command without changing the linker's semantics, give this
 303    symbol a nonzero.  */
 304 #ifndef LINK_ELIMINATE_DUPLICATE_LDIRECTORIES
 305 #define LINK_ELIMINATE_DUPLICATE_LDIRECTORIES 0
 306 #endif /* LINK_ELIMINATE_DUPLICATE_LDIRECTORIES */
 307
 308 /* If we have a definition of INCOMING_RETURN_ADDR_RTX, assume that
 309    the rest of the DWARF 2 frame unwind support is also provided.  */
 310 #if !defined (DWARF2_UNWIND_INFO) && defined (INCOMING_RETURN_ADDR_RTX)
 311 #define DWARF2_UNWIND_INFO 1
 312 #endif
 313
 314 /* If we have named sections, and we're using crtstuff to run ctors,
 315    use them for registering eh frame information.  */
 316 #if defined (TARGET_ASM_NAMED_SECTION) && DWARF2_UNWIND_INFO \
 317     && !defined(EH_FRAME_IN_DATA_SECTION)
 318 #ifndef EH_FRAME_SECTION_NAME
 319 #define EH_FRAME_SECTION_NAME ".eh_frame"
 320 #endif
 321 #endif
 322
 323 /* If we have named section and we support weak symbols, then use the
 324    .jcr section for recording java classes which need to be registered
 325    at program start-up time.  */
 326 #if defined (TARGET_ASM_NAMED_SECTION) && SUPPORTS_WEAK
 327 #ifndef JCR_SECTION_NAME
 328 #define JCR_SECTION_NAME ".jcr"
 329 #endif
 330 #endif
 331
 332 /* By default, we generate a label at the beginning and end of the
 333    text section, and compute the size of the text section by
 334    subtracting the two.  However, on some platforms that doesn't
 335    work, and we use the section itself, rather than a label at the
 336    beginning of it, to indicate the start of the section.  On such
 337    platforms, define this to zero.  */
 338 #ifndef DWARF2_GENERATE_TEXT_SECTION_LABEL
 339 #define DWARF2_GENERATE_TEXT_SECTION_LABEL 1
 340 #endif
 341
 342 /* Number of hardware registers that go into the DWARF-2 unwind info.
 343    If not defined, equals FIRST_PSEUDO_REGISTER  */
 344
 345 #ifndef DWARF_FRAME_REGISTERS
 346 #define DWARF_FRAME_REGISTERS FIRST_PSEUDO_REGISTER
 347 #endif
 348
 349 /* How to renumber registers for dbx and gdb.  If not defined, assume
 350    no renumbering is necessary.  */
 351
 352 #ifndef DBX_REGISTER_NUMBER
 353 #define DBX_REGISTER_NUMBER(REGNO) (REGNO)
 354 #endif
 355
 356 /* Default sizes for base C types.  If the sizes are different for
 357    your target, you should override these values by defining the
 358    appropriate symbols in your tm.h file.  */
 359
 360 #ifndef BITS_PER_UNIT
 361 #define BITS_PER_UNIT 8
 362 #endif
 363
 364 #ifndef BITS_PER_WORD
 365 #define BITS_PER_WORD (BITS_PER_UNIT * UNITS_PER_WORD)
 366 #endif
 367
 368 #ifndef CHAR_TYPE_SIZE
 369 #define CHAR_TYPE_SIZE BITS_PER_UNIT
 370 #endif
 371
 372 #ifndef BOOL_TYPE_SIZE
 373 /* `bool' has size and alignment `1', on almost all platforms.  */
 374 #define BOOL_TYPE_SIZE CHAR_TYPE_SIZE
 375 #endif
 376
 377 #ifndef SHORT_TYPE_SIZE
 378 #define SHORT_TYPE_SIZE (BITS_PER_UNIT * MIN ((UNITS_PER_WORD + 1) / 2, 2))
 379 #endif
 380
 381 #ifndef INT_TYPE_SIZE
 382 #define INT_TYPE_SIZE BITS_PER_WORD
 383 #endif
 384
 385 #ifndef LONG_TYPE_SIZE
 386 #define LONG_TYPE_SIZE BITS_PER_WORD
 387 #endif
 388
 389 #ifndef LONG_LONG_TYPE_SIZE
 390 #define LONG_LONG_TYPE_SIZE (BITS_PER_WORD * 2)
 391 #endif
 392
 393 #ifndef WCHAR_TYPE_SIZE
 394 #define WCHAR_TYPE_SIZE INT_TYPE_SIZE
 395 #endif
 396
 397 #ifndef FLOAT_TYPE_SIZE
 398 #define FLOAT_TYPE_SIZE BITS_PER_WORD
 399 #endif
 400
 401 #ifndef DOUBLE_TYPE_SIZE
 402 #define DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
 403 #endif
 404
 405 #ifndef LONG_DOUBLE_TYPE_SIZE
 406 #define LONG_DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
 407 #endif
 408
 409 /* Width in bits of a pointer.  Mind the value of the macro `Pmode'.  */
 410 #ifndef POINTER_SIZE
 411 #define POINTER_SIZE BITS_PER_WORD
 412 #endif
 413
 414 #ifndef PIC_OFFSET_TABLE_REGNUM
 415 #define PIC_OFFSET_TABLE_REGNUM INVALID_REGNUM
 416 #endif
 417
 418 #ifndef TARGET_DLLIMPORT_DECL_ATTRIBUTES
 419 #define TARGET_DLLIMPORT_DECL_ATTRIBUTES 0
 420 #endif
 421
 422 #ifndef TARGET_DECLSPEC
 423 #if TARGET_DLLIMPORT_DECL_ATTRIBUTES
 424 /* If the target supports the "dllimport" attribute, users are
 425    probably used to the "__declspec" syntax.  */
 426 #define TARGET_DECLSPEC 1
 427 #else
 428 #define TARGET_DECLSPEC 0
 429 #endif
 430 #endif
 431
 432 /* By default, the preprocessor should be invoked the same way in C++
 433    as in C.  */
 434 #ifndef CPLUSPLUS_CPP_SPEC
 435 #ifdef CPP_SPEC
 436 #define CPLUSPLUS_CPP_SPEC CPP_SPEC
 437 #endif
 438 #endif
 439
 440 #ifndef ACCUMULATE_OUTGOING_ARGS
 441 #define ACCUMULATE_OUTGOING_ARGS 0
 442 #endif
 443
 444 /* Supply a default definition for PUSH_ARGS.  */
 445 #ifndef PUSH_ARGS
 446 #ifdef PUSH_ROUNDING
 447 #define PUSH_ARGS       !ACCUMULATE_OUTGOING_ARGS
 448 #else
 449 #define PUSH_ARGS       0
 450 #endif
 451 #endif
 452
 453 /* Decide whether a function's arguments should be processed
 454    from first to last or from last to first.
 455
 456    They should if the stack and args grow in opposite directions, but
 457    only if we have push insns.  */
 458
 459 #ifdef PUSH_ROUNDING
 460
 461 #ifndef PUSH_ARGS_REVERSED
 462 #if defined (STACK_GROWS_DOWNWARD) != defined (ARGS_GROW_DOWNWARD)
 463 #define PUSH_ARGS_REVERSED  PUSH_ARGS
 464 #endif
 465 #endif
 466
 467 #endif
 468
 469 #ifndef PUSH_ARGS_REVERSED
 470 #define PUSH_ARGS_REVERSED 0
 471 #endif
 472
 473 /* If PREFERRED_STACK_BOUNDARY is not defined, set it to STACK_BOUNDARY.
 474    STACK_BOUNDARY is required.  */
 475 #ifndef PREFERRED_STACK_BOUNDARY
 476 #define PREFERRED_STACK_BOUNDARY STACK_BOUNDARY
 477 #endif
 478
 479 /* By default, the C++ compiler will use function addresses in the
 480    vtable entries.  Setting this nonzero tells the compiler to use
 481    function descriptors instead.  The value of this macro says how
 482    many words wide the descriptor is (normally 2).  It is assumed
 483    that the address of a function descriptor may be treated as a
 484    pointer to a function.  */
 485 #ifndef TARGET_VTABLE_USES_DESCRIPTORS
 486 #define TARGET_VTABLE_USES_DESCRIPTORS 0
 487 #endif
 488
 489 /* By default, the vtable entries are void pointers, the so the alignment
 490    is the same as pointer alignment.  The value of this macro specifies
 491    the alignment of the vtable entry in bits.  It should be defined only
 492    when special alignment is necessary.  */
 493 #ifndef TARGET_VTABLE_ENTRY_ALIGN
 494 #define TARGET_VTABLE_ENTRY_ALIGN POINTER_SIZE
 495 #endif
 496
 497 /* There are a few non-descriptor entries in the vtable at offsets below
 498    zero.  If these entries must be padded (say, to preserve the alignment
 499    specified by TARGET_VTABLE_ENTRY_ALIGN), set this to the number of
 500    words in each data entry.  */
 501 #ifndef TARGET_VTABLE_DATA_ENTRY_DISTANCE
 502 #define TARGET_VTABLE_DATA_ENTRY_DISTANCE 1
 503 #endif
 504
 505 /* Decide whether it is safe to use a local alias for a virtual function
 506    when constructing thunks.  */
 507 #ifndef TARGET_USE_LOCAL_THUNK_ALIAS_P
 508 #ifdef ASM_OUTPUT_DEF
 509 #define TARGET_USE_LOCAL_THUNK_ALIAS_P(DECL) 1
 510 #else
 511 #define TARGET_USE_LOCAL_THUNK_ALIAS_P(DECL) 0
 512 #endif
 513 #endif
 514
 515 /* Select a format to encode pointers in exception handling data.  We
 516    prefer those that result in fewer dynamic relocations.  Assume no
 517    special support here and encode direct references.  */
 518 #ifndef ASM_PREFERRED_EH_DATA_FORMAT
 519 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE,GLOBAL)  DW_EH_PE_absptr
 520 #endif
 521
 522 /* By default, the C++ compiler will use the lowest bit of the pointer
 523    to function to indicate a pointer-to-member-function points to a
 524    virtual member function.  However, if FUNCTION_BOUNDARY indicates
 525    function addresses aren't always even, the lowest bit of the delta
 526    field will be used.  */
 527 #ifndef TARGET_PTRMEMFUNC_VBIT_LOCATION
 528 #define TARGET_PTRMEMFUNC_VBIT_LOCATION \
 529   (FUNCTION_BOUNDARY >= 2 * BITS_PER_UNIT \
 530    ? ptrmemfunc_vbit_in_pfn : ptrmemfunc_vbit_in_delta)
 531 #endif
 532
 533 #ifndef DEFAULT_GDB_EXTENSIONS
 534 #define DEFAULT_GDB_EXTENSIONS 1
 535 #endif
 536
 537 /* If more than one debugging type is supported, you must define
 538    PREFERRED_DEBUGGING_TYPE to choose a format in a system-dependent way.
 539
 540    This is one long line cause VAXC can't handle a \-newline.  */
 541 #if 1 < (defined (DBX_DEBUGGING_INFO) + defined (SDB_DEBUGGING_INFO) + defined (DWARF2_DEBUGGING_INFO) + defined (XCOFF_DEBUGGING_INFO) + defined (VMS_DEBUGGING_INFO))
 542 #ifndef PREFERRED_DEBUGGING_TYPE
 543 You Lose!  You must define PREFERRED_DEBUGGING_TYPE!
 544 #endif /* no PREFERRED_DEBUGGING_TYPE */
 545 #else /* Only one debugging format supported.  Define PREFERRED_DEBUGGING_TYPE
 546          so other code needn't care.  */
 547 #ifdef DBX_DEBUGGING_INFO
 548 #define PREFERRED_DEBUGGING_TYPE DBX_DEBUG
 549 #endif
 550 #ifdef SDB_DEBUGGING_INFO
 551 #define PREFERRED_DEBUGGING_TYPE SDB_DEBUG
 552 #endif
 553 #ifdef DWARF_DEBUGGING_INFO
 554 #define PREFERRED_DEBUGGING_TYPE DWARF_DEBUG
 555 #endif
 556 #ifdef DWARF2_DEBUGGING_INFO
 557 #define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
 558 #endif
 559 #ifdef VMS_DEBUGGING_INFO
 560 #define PREFERRED_DEBUGGING_TYPE VMS_AND_DWARF2_DEBUG
 561 #endif
 562 #ifdef XCOFF_DEBUGGING_INFO
 563 #define PREFERRED_DEBUGGING_TYPE XCOFF_DEBUG
 564 #endif
 565 #endif /* More than one debugger format enabled.  */
 566
 567 /* If still not defined, must have been because no debugging formats
 568    are supported.  */
 569 #ifndef PREFERRED_DEBUGGING_TYPE
 570 #define PREFERRED_DEBUGGING_TYPE NO_DEBUG
 571 #endif
 572
 573 /* Define codes for all the float formats that we know of.  */
 574 #define UNKNOWN_FLOAT_FORMAT 0
 575 #define IEEE_FLOAT_FORMAT 1
 576 #define VAX_FLOAT_FORMAT 2
 577 #define IBM_FLOAT_FORMAT 3
 578 #define C4X_FLOAT_FORMAT 4
 579
 580 /* Default to IEEE float if not specified.  Nearly all machines use it.  */
 581 #ifndef TARGET_FLOAT_FORMAT
 582 #define TARGET_FLOAT_FORMAT     IEEE_FLOAT_FORMAT
 583 #endif
 584
 585 /* Determine the register class for registers suitable to be the base
 586    address register in a MEM.  Allow the choice to be dependent upon
 587    the mode of the memory access.  */
 588 #ifndef MODE_BASE_REG_CLASS
 589 #define MODE_BASE_REG_CLASS(MODE) BASE_REG_CLASS
 590 #endif
 591
 592 #ifndef LARGEST_EXPONENT_IS_NORMAL
 593 #define LARGEST_EXPONENT_IS_NORMAL(SIZE) 0
 594 #endif
 595
 596 #ifndef ROUND_TOWARDS_ZERO
 597 #define ROUND_TOWARDS_ZERO 0
 598 #endif
 599
 600 #ifndef MODE_HAS_NANS
 601 #define MODE_HAS_NANS(MODE)                                     \
 602   (FLOAT_MODE_P (MODE)                                          \
 603    && TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT                  \
 604    && !LARGEST_EXPONENT_IS_NORMAL (GET_MODE_BITSIZE (MODE)))
 605 #endif
 606
 607 #ifndef MODE_HAS_INFINITIES
 608 #define MODE_HAS_INFINITIES(MODE)                               \
 609   (FLOAT_MODE_P (MODE)                                          \
 610    && TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT                  \
 611    && !LARGEST_EXPONENT_IS_NORMAL (GET_MODE_BITSIZE (MODE)))
 612 #endif
 613
 614 #ifndef MODE_HAS_SIGNED_ZEROS
 615 #define MODE_HAS_SIGNED_ZEROS(MODE) \
 616   (FLOAT_MODE_P (MODE) && TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT)
 617 #endif
 618
 619 #ifndef MODE_HAS_SIGN_DEPENDENT_ROUNDING
 620 #define MODE_HAS_SIGN_DEPENDENT_ROUNDING(MODE)                  \
 621   (FLOAT_MODE_P (MODE)                                          \
 622    && TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT                  \
 623    && !ROUND_TOWARDS_ZERO)
 624 #endif
 625
 626 #ifndef FLOAT_LIB_COMPARE_RETURNS_BOOL
 627 #define FLOAT_LIB_COMPARE_RETURNS_BOOL(MODE, COMPARISON) false
 628 #endif
 629
 630 /* True if the target should use the standard libgcc arithmetic
 631    library functions, like __addsi3 and _fixdfdi.  */
 632 #ifndef TARGET_LIBGCC_LIBFUNCS
 633 #define TARGET_LIBGCC_LIBFUNCS (true)
 634 #endif
 635
 636 /* True if the targets integer-comparision fucntions return { 0, 1, 2
 637    } to indicate { <, ==, > }.  False if { -1, 0, 1 } is used
 638    instead.  The libgcc routines are biased.  */
 639 #ifndef TARGET_LIB_INT_CMP_BIASED
 640 #define TARGET_LIB_INT_CMP_BIASED (true)
 641 #endif
 642
 643 /* If FLOAT_WORDS_BIG_ENDIAN is not defined in the header files,
 644    then the word-endianness is the same as for integers.  */
 645 #ifndef FLOAT_WORDS_BIG_ENDIAN
 646 #define FLOAT_WORDS_BIG_ENDIAN WORDS_BIG_ENDIAN
 647 #endif
 648
 649 #ifndef TARGET_FLT_EVAL_METHOD
 650 #define TARGET_FLT_EVAL_METHOD 0
 651 #endif
 652
 653 #ifndef HOT_TEXT_SECTION_NAME
 654 #define HOT_TEXT_SECTION_NAME ".text.hot"
 655 #endif
 656
 657 #ifndef NORMAL_TEXT_SECTION_NAME
 658 #define NORMAL_TEXT_SECTION_NAME ".text"
 659 #endif
 660
 661 #ifndef UNLIKELY_EXECUTED_TEXT_SECTION_NAME
 662 #define UNLIKELY_EXECUTED_TEXT_SECTION_NAME ".text.unlikely"
 663 #endif
 664
 665 #ifndef HAS_LONG_COND_BRANCH
 666 #define HAS_LONG_COND_BRANCH 0
 667 #endif
 668
 669 #ifndef HAS_LONG_UNCOND_BRANCH
 670 #define HAS_LONG_UNCOND_BRANCH 0
 671 #endif
 672
 673 #ifndef VECTOR_MODE_SUPPORTED_P
 674 #define VECTOR_MODE_SUPPORTED_P(MODE) 0
 675 #endif
 676
 677 /* Determine whether __cxa_atexit, rather than atexit, is used to
 678    register C++ destructors for local statics and global objects.  */
 679 #ifndef DEFAULT_USE_CXA_ATEXIT
 680 #define DEFAULT_USE_CXA_ATEXIT 0
 681 #endif
 682
 683 /* Determine whether extra constraint letter should be handled
 684    via address reload (like 'o').  */
 685 #ifndef EXTRA_MEMORY_CONSTRAINT
 686 #define EXTRA_MEMORY_CONSTRAINT(C,STR) 0
 687 #endif
 688
 689 /* Determine whether extra constraint letter should be handled
 690    as an address (like 'p').  */
 691 #ifndef EXTRA_ADDRESS_CONSTRAINT
 692 #define EXTRA_ADDRESS_CONSTRAINT(C,STR) 0
 693 #endif
 694
 695 /* When a port defines CONSTRAINT_LEN, it should use DEFAULT_CONSTRAINT_LEN
 696    for all the characters that it does not want to change, so things like the
 697   'length' of a digit in a matching constraint is an implementation detail,
 698    and not part of the interface.  */
 699 #define DEFAULT_CONSTRAINT_LEN(C,STR) 1
 700
 701 #ifndef CONSTRAINT_LEN
 702 #define CONSTRAINT_LEN(C,STR) DEFAULT_CONSTRAINT_LEN (C, STR)
 703 #endif
 704
 705 #if defined (CONST_OK_FOR_LETTER_P) && ! defined (CONST_OK_FOR_CONSTRAINT_P)
 706 #define CONST_OK_FOR_CONSTRAINT_P(VAL,C,STR) CONST_OK_FOR_LETTER_P (VAL, C)
 707 #endif
 708
 709 #if defined (CONST_DOUBLE_OK_FOR_LETTER_P) && ! defined (CONST_DOUBLE_OK_FOR_CONSTRAINT_P)
 710 #define CONST_DOUBLE_OK_FOR_CONSTRAINT_P(OP,C,STR) \
 711   CONST_DOUBLE_OK_FOR_LETTER_P (OP, C)
 712 #endif
 713
 714 #ifndef REG_CLASS_FROM_CONSTRAINT
 715 #define REG_CLASS_FROM_CONSTRAINT(C,STR) REG_CLASS_FROM_LETTER (C)
 716 #endif
 717
 718 #if defined (EXTRA_CONSTRAINT) && ! defined (EXTRA_CONSTRAINT_STR)
 719 #define EXTRA_CONSTRAINT_STR(OP, C,STR) EXTRA_CONSTRAINT (OP, C)
 720 #endif
 721
 722 #ifndef REGISTER_MOVE_COST
 723 #define REGISTER_MOVE_COST(m, x, y) 2
 724 #endif
 725
 726 /* Determine whether the the entire c99 runtime
 727    is present in the runtime library.  */
 728 #ifndef TARGET_C99_FUNCTIONS
 729 #define TARGET_C99_FUNCTIONS 0
 730 #endif
 731
 732 /* Indicate that CLZ and CTZ are undefined at zero.  */
 733 #ifndef CLZ_DEFINED_VALUE_AT_ZERO
 734 #define CLZ_DEFINED_VALUE_AT_ZERO(MODE, VALUE)  0
 735 #endif
 736 #ifndef CTZ_DEFINED_VALUE_AT_ZERO
 737 #define CTZ_DEFINED_VALUE_AT_ZERO(MODE, VALUE)  0
 738 #endif
 739
 740 /* Provide a default value for STORE_FLAG_VALUE.  */
 741 #ifndef STORE_FLAG_VALUE
 742 #define STORE_FLAG_VALUE  1
 743 #endif
 744
 745 /* This macro is used to determine what the largest unit size that
 746    move_by_pieces can use is.  */
 747
 748 /* MOVE_MAX_PIECES is the number of bytes at a time which we can
 749    move efficiently, as opposed to  MOVE_MAX which is the maximum
 750    number of bytes we can move with a single instruction.  */
 751
 752 #ifndef MOVE_MAX_PIECES
 753 #define MOVE_MAX_PIECES   MOVE_MAX
 754 #endif
 755
 756 #ifndef STACK_POINTER_OFFSET
 757 #define STACK_POINTER_OFFSET    0
 758 #endif
 759
 760 #ifndef LOCAL_REGNO
 761 #define LOCAL_REGNO(REGNO)  0
 762 #endif
 763
 764 /* EXIT_IGNORE_STACK should be nonzero if, when returning from a function,
 765    the stack pointer does not matter.  The value is tested only in
 766    functions that have frame pointers.  */
 767 #ifndef EXIT_IGNORE_STACK
 768 #define EXIT_IGNORE_STACK 0
 769 #endif
 770
 771 /* Assume that case vectors are not pc-relative.  */
 772 #ifndef CASE_VECTOR_PC_RELATIVE
 773 #define CASE_VECTOR_PC_RELATIVE 0
 774 #endif
 775
 776 /* Assume that trampolines need function alignment.  */
 777 #ifndef TRAMPOLINE_ALIGNMENT
 778 #define TRAMPOLINE_ALIGNMENT FUNCTION_BOUNDARY
 779 #endif
 780
 781 /* Register mappings for target machines without register windows.  */
 782 #ifndef INCOMING_REGNO
 783 #define INCOMING_REGNO(N) (N)
 784 #endif
 785
 786 #ifndef OUTGOING_REGNO
 787 #define OUTGOING_REGNO(N) (N)
 788 #endif
 789
 790 #ifndef SHIFT_COUNT_TRUNCATED
 791 #define SHIFT_COUNT_TRUNCATED 0
 792 #endif
 793
 794 #ifndef LEGITIMIZE_ADDRESS
 795 #define LEGITIMIZE_ADDRESS(X, OLDX, MODE, WIN)
 796 #endif
 797
 798 #ifndef LEGITIMATE_PIC_OPERAND_P
 799 #define LEGITIMATE_PIC_OPERAND_P(X) 1
 800 #endif
 801
 802 #ifndef REVERSIBLE_CC_MODE
 803 #define REVERSIBLE_CC_MODE(MODE) 0
 804 #endif
 805
 806 #endif  /* ! GCC_DEFAULTS_H */