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 /* By default we can assume that all global symbols are in one namespace,
 295    across all shared libraries.  */
 296 #ifndef MULTIPLE_SYMBOL_SPACES
 297 # define MULTIPLE_SYMBOL_SPACES 0
 298 #endif
 299
 300 /* If the target supports init_priority C++ attribute, give
 301    SUPPORTS_INIT_PRIORITY a nonzero value.  */
 302 #ifndef SUPPORTS_INIT_PRIORITY
 303 #define SUPPORTS_INIT_PRIORITY 1
 304 #endif /* SUPPORTS_INIT_PRIORITY */
 305
 306 /* If duplicate library search directories can be removed from a
 307    linker command without changing the linker's semantics, give this
 308    symbol a nonzero.  */
 309 #ifndef LINK_ELIMINATE_DUPLICATE_LDIRECTORIES
 310 #define LINK_ELIMINATE_DUPLICATE_LDIRECTORIES 0
 311 #endif /* LINK_ELIMINATE_DUPLICATE_LDIRECTORIES */
 312
 313 /* If we have a definition of INCOMING_RETURN_ADDR_RTX, assume that
 314    the rest of the DWARF 2 frame unwind support is also provided.  */
 315 #if !defined (DWARF2_UNWIND_INFO) && defined (INCOMING_RETURN_ADDR_RTX)
 316 #define DWARF2_UNWIND_INFO 1
 317 #endif
 318
 319 /* If we have named sections, and we're using crtstuff to run ctors,
 320    use them for registering eh frame information.  */
 321 #if defined (TARGET_ASM_NAMED_SECTION) && DWARF2_UNWIND_INFO \
 322     && !defined(EH_FRAME_IN_DATA_SECTION)
 323 #ifndef EH_FRAME_SECTION_NAME
 324 #define EH_FRAME_SECTION_NAME ".eh_frame"
 325 #endif
 326 #endif
 327
 328 /* If we have named section and we support weak symbols, then use the
 329    .jcr section for recording java classes which need to be registered
 330    at program start-up time.  */
 331 #if defined (TARGET_ASM_NAMED_SECTION) && SUPPORTS_WEAK
 332 #ifndef JCR_SECTION_NAME
 333 #define JCR_SECTION_NAME ".jcr"
 334 #endif
 335 #endif
 336
 337 /* By default, we generate a label at the beginning and end of the
 338    text section, and compute the size of the text section by
 339    subtracting the two.  However, on some platforms that doesn't
 340    work, and we use the section itself, rather than a label at the
 341    beginning of it, to indicate the start of the section.  On such
 342    platforms, define this to zero.  */
 343 #ifndef DWARF2_GENERATE_TEXT_SECTION_LABEL
 344 #define DWARF2_GENERATE_TEXT_SECTION_LABEL 1
 345 #endif
 346
 347 /* Number of hardware registers that go into the DWARF-2 unwind info.
 348    If not defined, equals FIRST_PSEUDO_REGISTER  */
 349
 350 #ifndef DWARF_FRAME_REGISTERS
 351 #define DWARF_FRAME_REGISTERS FIRST_PSEUDO_REGISTER
 352 #endif
 353
 354 /* How to renumber registers for dbx and gdb.  If not defined, assume
 355    no renumbering is necessary.  */
 356
 357 #ifndef DBX_REGISTER_NUMBER
 358 #define DBX_REGISTER_NUMBER(REGNO) (REGNO)
 359 #endif
 360
 361 /* Default sizes for base C types.  If the sizes are different for
 362    your target, you should override these values by defining the
 363    appropriate symbols in your tm.h file.  */
 364
 365 #ifndef BITS_PER_UNIT
 366 #define BITS_PER_UNIT 8
 367 #endif
 368
 369 #ifndef BITS_PER_WORD
 370 #define BITS_PER_WORD (BITS_PER_UNIT * UNITS_PER_WORD)
 371 #endif
 372
 373 #ifndef CHAR_TYPE_SIZE
 374 #define CHAR_TYPE_SIZE BITS_PER_UNIT
 375 #endif
 376
 377 #ifndef BOOL_TYPE_SIZE
 378 /* `bool' has size and alignment `1', on almost all platforms.  */
 379 #define BOOL_TYPE_SIZE CHAR_TYPE_SIZE
 380 #endif
 381
 382 #ifndef SHORT_TYPE_SIZE
 383 #define SHORT_TYPE_SIZE (BITS_PER_UNIT * MIN ((UNITS_PER_WORD + 1) / 2, 2))
 384 #endif
 385
 386 #ifndef INT_TYPE_SIZE
 387 #define INT_TYPE_SIZE BITS_PER_WORD
 388 #endif
 389
 390 #ifndef LONG_TYPE_SIZE
 391 #define LONG_TYPE_SIZE BITS_PER_WORD
 392 #endif
 393
 394 #ifndef LONG_LONG_TYPE_SIZE
 395 #define LONG_LONG_TYPE_SIZE (BITS_PER_WORD * 2)
 396 #endif
 397
 398 #ifndef WCHAR_TYPE_SIZE
 399 #define WCHAR_TYPE_SIZE INT_TYPE_SIZE
 400 #endif
 401
 402 #ifndef FLOAT_TYPE_SIZE
 403 #define FLOAT_TYPE_SIZE BITS_PER_WORD
 404 #endif
 405
 406 #ifndef DOUBLE_TYPE_SIZE
 407 #define DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
 408 #endif
 409
 410 #ifndef LONG_DOUBLE_TYPE_SIZE
 411 #define LONG_DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
 412 #endif
 413
 414 /* Width in bits of a pointer.  Mind the value of the macro `Pmode'.  */
 415 #ifndef POINTER_SIZE
 416 #define POINTER_SIZE BITS_PER_WORD
 417 #endif
 418
 419 #ifndef PIC_OFFSET_TABLE_REGNUM
 420 #define PIC_OFFSET_TABLE_REGNUM INVALID_REGNUM
 421 #endif
 422
 423 #ifndef TARGET_DLLIMPORT_DECL_ATTRIBUTES
 424 #define TARGET_DLLIMPORT_DECL_ATTRIBUTES 0
 425 #endif
 426
 427 #ifndef TARGET_DECLSPEC
 428 #if TARGET_DLLIMPORT_DECL_ATTRIBUTES
 429 /* If the target supports the "dllimport" attribute, users are
 430    probably used to the "__declspec" syntax.  */
 431 #define TARGET_DECLSPEC 1
 432 #else
 433 #define TARGET_DECLSPEC 0
 434 #endif
 435 #endif
 436
 437 /* By default, the preprocessor should be invoked the same way in C++
 438    as in C.  */
 439 #ifndef CPLUSPLUS_CPP_SPEC
 440 #ifdef CPP_SPEC
 441 #define CPLUSPLUS_CPP_SPEC CPP_SPEC
 442 #endif
 443 #endif
 444
 445 #ifndef ACCUMULATE_OUTGOING_ARGS
 446 #define ACCUMULATE_OUTGOING_ARGS 0
 447 #endif
 448
 449 /* Supply a default definition for PUSH_ARGS.  */
 450 #ifndef PUSH_ARGS
 451 #ifdef PUSH_ROUNDING
 452 #define PUSH_ARGS       !ACCUMULATE_OUTGOING_ARGS
 453 #else
 454 #define PUSH_ARGS       0
 455 #endif
 456 #endif
 457
 458 /* Decide whether a function's arguments should be processed
 459    from first to last or from last to first.
 460
 461    They should if the stack and args grow in opposite directions, but
 462    only if we have push insns.  */
 463
 464 #ifdef PUSH_ROUNDING
 465
 466 #ifndef PUSH_ARGS_REVERSED
 467 #if defined (STACK_GROWS_DOWNWARD) != defined (ARGS_GROW_DOWNWARD)
 468 #define PUSH_ARGS_REVERSED  PUSH_ARGS
 469 #endif
 470 #endif
 471
 472 #endif
 473
 474 #ifndef PUSH_ARGS_REVERSED
 475 #define PUSH_ARGS_REVERSED 0
 476 #endif
 477
 478 /* If PREFERRED_STACK_BOUNDARY is not defined, set it to STACK_BOUNDARY.
 479    STACK_BOUNDARY is required.  */
 480 #ifndef PREFERRED_STACK_BOUNDARY
 481 #define PREFERRED_STACK_BOUNDARY STACK_BOUNDARY
 482 #endif
 483
 484 #ifndef TARGET_DEFAULT_PACK_STRUCT
 485 #define TARGET_DEFAULT_PACK_STRUCT 0
 486 #endif
 487
 488 /* By default, the C++ compiler will use function addresses in the
 489    vtable entries.  Setting this nonzero tells the compiler to use
 490    function descriptors instead.  The value of this macro says how
 491    many words wide the descriptor is (normally 2).  It is assumed
 492    that the address of a function descriptor may be treated as a
 493    pointer to a function.  */
 494 #ifndef TARGET_VTABLE_USES_DESCRIPTORS
 495 #define TARGET_VTABLE_USES_DESCRIPTORS 0
 496 #endif
 497
 498 /* By default, the vtable entries are void pointers, the so the alignment
 499    is the same as pointer alignment.  The value of this macro specifies
 500    the alignment of the vtable entry in bits.  It should be defined only
 501    when special alignment is necessary.  */
 502 #ifndef TARGET_VTABLE_ENTRY_ALIGN
 503 #define TARGET_VTABLE_ENTRY_ALIGN POINTER_SIZE
 504 #endif
 505
 506 /* There are a few non-descriptor entries in the vtable at offsets below
 507    zero.  If these entries must be padded (say, to preserve the alignment
 508    specified by TARGET_VTABLE_ENTRY_ALIGN), set this to the number of
 509    words in each data entry.  */
 510 #ifndef TARGET_VTABLE_DATA_ENTRY_DISTANCE
 511 #define TARGET_VTABLE_DATA_ENTRY_DISTANCE 1
 512 #endif
 513
 514 /* Decide whether it is safe to use a local alias for a virtual function
 515    when constructing thunks.  */
 516 #ifndef TARGET_USE_LOCAL_THUNK_ALIAS_P
 517 #ifdef ASM_OUTPUT_DEF
 518 #define TARGET_USE_LOCAL_THUNK_ALIAS_P(DECL) 1
 519 #else
 520 #define TARGET_USE_LOCAL_THUNK_ALIAS_P(DECL) 0
 521 #endif
 522 #endif
 523
 524 /* Select a format to encode pointers in exception handling data.  We
 525    prefer those that result in fewer dynamic relocations.  Assume no
 526    special support here and encode direct references.  */
 527 #ifndef ASM_PREFERRED_EH_DATA_FORMAT
 528 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE,GLOBAL)  DW_EH_PE_absptr
 529 #endif
 530
 531 /* By default, the C++ compiler will use the lowest bit of the pointer
 532    to function to indicate a pointer-to-member-function points to a
 533    virtual member function.  However, if FUNCTION_BOUNDARY indicates
 534    function addresses aren't always even, the lowest bit of the delta
 535    field will be used.  */
 536 #ifndef TARGET_PTRMEMFUNC_VBIT_LOCATION
 537 #define TARGET_PTRMEMFUNC_VBIT_LOCATION \
 538   (FUNCTION_BOUNDARY >= 2 * BITS_PER_UNIT \
 539    ? ptrmemfunc_vbit_in_pfn : ptrmemfunc_vbit_in_delta)
 540 #endif
 541
 542 #ifndef DEFAULT_GDB_EXTENSIONS
 543 #define DEFAULT_GDB_EXTENSIONS 1
 544 #endif
 545
 546 /* If more than one debugging type is supported, you must define
 547    PREFERRED_DEBUGGING_TYPE to choose the default.  */
 548
 549 #if 1 < (defined (DBX_DEBUGGING_INFO) + defined (SDB_DEBUGGING_INFO) \
 550          + defined (DWARF2_DEBUGGING_INFO) + defined (XCOFF_DEBUGGING_INFO) \
 551          + defined (VMS_DEBUGGING_INFO))
 552 #ifndef PREFERRED_DEBUGGING_TYPE
 553 #error You must define PREFERRED_DEBUGGING_TYPE
 554 #endif /* no PREFERRED_DEBUGGING_TYPE */
 555
 556 /* If only one debugging format is supported, define PREFERRED_DEBUGGING_TYPE
 557    here so other code needn't care.  */
 558 #elif defined DBX_DEBUGGING_INFO
 559 #define PREFERRED_DEBUGGING_TYPE DBX_DEBUG
 560
 561 #elif defined SDB_DEBUGGING_INFO
 562 #define PREFERRED_DEBUGGING_TYPE SDB_DEBUG
 563
 564 #elif defined DWARF2_DEBUGGING_INFO
 565 #define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
 566
 567 #elif defined VMS_DEBUGGING_INFO
 568 #define PREFERRED_DEBUGGING_TYPE VMS_AND_DWARF2_DEBUG
 569
 570 #elif defined XCOFF_DEBUGGING_INFO
 571 #define PREFERRED_DEBUGGING_TYPE XCOFF_DEBUG
 572
 573 #else
 574 /* No debugging format is supported by this target.  */
 575 #define PREFERRED_DEBUGGING_TYPE NO_DEBUG
 576 #endif
 577
 578 /* Define codes for all the float formats that we know of.  */
 579 #define UNKNOWN_FLOAT_FORMAT 0
 580 #define IEEE_FLOAT_FORMAT 1
 581 #define VAX_FLOAT_FORMAT 2
 582 #define IBM_FLOAT_FORMAT 3
 583 #define C4X_FLOAT_FORMAT 4
 584
 585 /* Default to IEEE float if not specified.  Nearly all machines use it.  */
 586 #ifndef TARGET_FLOAT_FORMAT
 587 #define TARGET_FLOAT_FORMAT     IEEE_FLOAT_FORMAT
 588 #endif
 589
 590 /* Determine the register class for registers suitable to be the base
 591    address register in a MEM.  Allow the choice to be dependent upon
 592    the mode of the memory access.  */
 593 #ifndef MODE_BASE_REG_CLASS
 594 #define MODE_BASE_REG_CLASS(MODE) BASE_REG_CLASS
 595 #endif
 596
 597 #ifndef LARGEST_EXPONENT_IS_NORMAL
 598 #define LARGEST_EXPONENT_IS_NORMAL(SIZE) 0
 599 #endif
 600
 601 #ifndef ROUND_TOWARDS_ZERO
 602 #define ROUND_TOWARDS_ZERO 0
 603 #endif
 604
 605 #ifndef MODE_HAS_NANS
 606 #define MODE_HAS_NANS(MODE)                                     \
 607   (FLOAT_MODE_P (MODE)                                          \
 608    && TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT                  \
 609    && !LARGEST_EXPONENT_IS_NORMAL (GET_MODE_BITSIZE (MODE)))
 610 #endif
 611
 612 #ifndef MODE_HAS_INFINITIES
 613 #define MODE_HAS_INFINITIES(MODE)                               \
 614   (FLOAT_MODE_P (MODE)                                          \
 615    && TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT                  \
 616    && !LARGEST_EXPONENT_IS_NORMAL (GET_MODE_BITSIZE (MODE)))
 617 #endif
 618
 619 #ifndef MODE_HAS_SIGNED_ZEROS
 620 #define MODE_HAS_SIGNED_ZEROS(MODE) \
 621   (FLOAT_MODE_P (MODE) && TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT)
 622 #endif
 623
 624 #ifndef MODE_HAS_SIGN_DEPENDENT_ROUNDING
 625 #define MODE_HAS_SIGN_DEPENDENT_ROUNDING(MODE)                  \
 626   (FLOAT_MODE_P (MODE)                                          \
 627    && TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT                  \
 628    && !ROUND_TOWARDS_ZERO)
 629 #endif
 630
 631 #ifndef FLOAT_LIB_COMPARE_RETURNS_BOOL
 632 #define FLOAT_LIB_COMPARE_RETURNS_BOOL(MODE, COMPARISON) false
 633 #endif
 634
 635 /* True if the targets integer-comparison functions return { 0, 1, 2
 636    } to indicate { <, ==, > }.  False if { -1, 0, 1 } is used
 637    instead.  The libgcc routines are biased.  */
 638 #ifndef TARGET_LIB_INT_CMP_BIASED
 639 #define TARGET_LIB_INT_CMP_BIASED (true)
 640 #endif
 641
 642 /* If FLOAT_WORDS_BIG_ENDIAN is not defined in the header files,
 643    then the word-endianness is the same as for integers.  */
 644 #ifndef FLOAT_WORDS_BIG_ENDIAN
 645 #define FLOAT_WORDS_BIG_ENDIAN WORDS_BIG_ENDIAN
 646 #endif
 647
 648 #ifndef TARGET_FLT_EVAL_METHOD
 649 #define TARGET_FLT_EVAL_METHOD 0
 650 #endif
 651
 652 #ifndef HOT_TEXT_SECTION_NAME
 653 #define HOT_TEXT_SECTION_NAME ".text.hot"
 654 #endif
 655
 656 #ifndef UNLIKELY_EXECUTED_TEXT_SECTION_NAME
 657 #define UNLIKELY_EXECUTED_TEXT_SECTION_NAME ".text.unlikely"
 658 #endif
 659
 660 #ifndef HAS_LONG_COND_BRANCH
 661 #define HAS_LONG_COND_BRANCH 0
 662 #endif
 663
 664 #ifndef HAS_LONG_UNCOND_BRANCH
 665 #define HAS_LONG_UNCOND_BRANCH 0
 666 #endif
 667
 668 #ifndef UNITS_PER_SIMD_WORD
 669 #define UNITS_PER_SIMD_WORD 0
 670 #endif
 671
 672 /* Determine whether __cxa_atexit, rather than atexit, is used to
 673    register C++ destructors for local statics and global objects.  */
 674 #ifndef DEFAULT_USE_CXA_ATEXIT
 675 #define DEFAULT_USE_CXA_ATEXIT 0
 676 #endif
 677
 678 /* Determine whether extra constraint letter should be handled
 679    via address reload (like 'o').  */
 680 #ifndef EXTRA_MEMORY_CONSTRAINT
 681 #define EXTRA_MEMORY_CONSTRAINT(C,STR) 0
 682 #endif
 683
 684 /* Determine whether extra constraint letter should be handled
 685    as an address (like 'p').  */
 686 #ifndef EXTRA_ADDRESS_CONSTRAINT
 687 #define EXTRA_ADDRESS_CONSTRAINT(C,STR) 0
 688 #endif
 689
 690 /* When a port defines CONSTRAINT_LEN, it should use DEFAULT_CONSTRAINT_LEN
 691    for all the characters that it does not want to change, so things like the
 692   'length' of a digit in a matching constraint is an implementation detail,
 693    and not part of the interface.  */
 694 #define DEFAULT_CONSTRAINT_LEN(C,STR) 1
 695
 696 #ifndef CONSTRAINT_LEN
 697 #define CONSTRAINT_LEN(C,STR) DEFAULT_CONSTRAINT_LEN (C, STR)
 698 #endif
 699
 700 #if defined (CONST_OK_FOR_LETTER_P) && ! defined (CONST_OK_FOR_CONSTRAINT_P)
 701 #define CONST_OK_FOR_CONSTRAINT_P(VAL,C,STR) CONST_OK_FOR_LETTER_P (VAL, C)
 702 #endif
 703
 704 #if defined (CONST_DOUBLE_OK_FOR_LETTER_P) && ! defined (CONST_DOUBLE_OK_FOR_CONSTRAINT_P)
 705 #define CONST_DOUBLE_OK_FOR_CONSTRAINT_P(OP,C,STR) \
 706   CONST_DOUBLE_OK_FOR_LETTER_P (OP, C)
 707 #endif
 708
 709 #ifndef REG_CLASS_FROM_CONSTRAINT
 710 #define REG_CLASS_FROM_CONSTRAINT(C,STR) REG_CLASS_FROM_LETTER (C)
 711 #endif
 712
 713 #if defined (EXTRA_CONSTRAINT) && ! defined (EXTRA_CONSTRAINT_STR)
 714 #define EXTRA_CONSTRAINT_STR(OP, C,STR) EXTRA_CONSTRAINT (OP, C)
 715 #endif
 716
 717 #ifndef REGISTER_MOVE_COST
 718 #define REGISTER_MOVE_COST(m, x, y) 2
 719 #endif
 720
 721 /* Determine whether the the entire c99 runtime
 722    is present in the runtime library.  */
 723 #ifndef TARGET_C99_FUNCTIONS
 724 #define TARGET_C99_FUNCTIONS 0
 725 #endif
 726
 727 /* Indicate that CLZ and CTZ are undefined at zero.  */
 728 #ifndef CLZ_DEFINED_VALUE_AT_ZERO
 729 #define CLZ_DEFINED_VALUE_AT_ZERO(MODE, VALUE)  0
 730 #endif
 731 #ifndef CTZ_DEFINED_VALUE_AT_ZERO
 732 #define CTZ_DEFINED_VALUE_AT_ZERO(MODE, VALUE)  0
 733 #endif
 734
 735 /* Provide a default value for STORE_FLAG_VALUE.  */
 736 #ifndef STORE_FLAG_VALUE
 737 #define STORE_FLAG_VALUE  1
 738 #endif
 739
 740 /* This macro is used to determine what the largest unit size that
 741    move_by_pieces can use is.  */
 742
 743 /* MOVE_MAX_PIECES is the number of bytes at a time which we can
 744    move efficiently, as opposed to  MOVE_MAX which is the maximum
 745    number of bytes we can move with a single instruction.  */
 746
 747 #ifndef MOVE_MAX_PIECES
 748 #define MOVE_MAX_PIECES   MOVE_MAX
 749 #endif
 750
 751 #ifndef STACK_POINTER_OFFSET
 752 #define STACK_POINTER_OFFSET    0
 753 #endif
 754
 755 #ifndef LOCAL_REGNO
 756 #define LOCAL_REGNO(REGNO)  0
 757 #endif
 758
 759 /* EXIT_IGNORE_STACK should be nonzero if, when returning from a function,
 760    the stack pointer does not matter.  The value is tested only in
 761    functions that have frame pointers.  */
 762 #ifndef EXIT_IGNORE_STACK
 763 #define EXIT_IGNORE_STACK 0
 764 #endif
 765
 766 /* Assume that case vectors are not pc-relative.  */
 767 #ifndef CASE_VECTOR_PC_RELATIVE
 768 #define CASE_VECTOR_PC_RELATIVE 0
 769 #endif
 770
 771 /* Assume that trampolines need function alignment.  */
 772 #ifndef TRAMPOLINE_ALIGNMENT
 773 #define TRAMPOLINE_ALIGNMENT FUNCTION_BOUNDARY
 774 #endif
 775
 776 /* Register mappings for target machines without register windows.  */
 777 #ifndef INCOMING_REGNO
 778 #define INCOMING_REGNO(N) (N)
 779 #endif
 780
 781 #ifndef OUTGOING_REGNO
 782 #define OUTGOING_REGNO(N) (N)
 783 #endif
 784
 785 #ifndef SHIFT_COUNT_TRUNCATED
 786 #define SHIFT_COUNT_TRUNCATED 0
 787 #endif
 788
 789 #ifndef LEGITIMIZE_ADDRESS
 790 #define LEGITIMIZE_ADDRESS(X, OLDX, MODE, WIN)
 791 #endif
 792
 793 #ifndef LEGITIMATE_PIC_OPERAND_P
 794 #define LEGITIMATE_PIC_OPERAND_P(X) 1
 795 #endif
 796
 797 #ifndef REVERSIBLE_CC_MODE
 798 #define REVERSIBLE_CC_MODE(MODE) 0
 799 #endif
 800
 801 /* Biggest alignment supported by the object file format of this machine.  */
 802 #ifndef MAX_OFILE_ALIGNMENT
 803 #define MAX_OFILE_ALIGNMENT BIGGEST_ALIGNMENT
 804 #endif
 805
 806 #endif  /* ! GCC_DEFAULTS_H */