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_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 / BITS_PER_UNIT, 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 /* Determines whether explicit template instantiations should
 241    be given link-once semantics. The C++ ABI requires this
 242    macro to be nonzero; see the documentation. */
 243 #ifndef TARGET_EXPLICIT_INSTANTIATIONS_ONE_ONLY
 244 # define TARGET_EXPLICIT_INSTANTIATIONS_ONE_ONLY 1
 245 #endif
 246
 247 /* This determines whether or not we need linkonce unwind information */
 248 #ifndef TARGET_USES_WEAK_UNWIND_INFO
 249 #define TARGET_USES_WEAK_UNWIND_INFO 0
 250 #endif
 251
 252 /* By default, there is no prefix on user-defined symbols.  */
 253 #ifndef USER_LABEL_PREFIX
 254 #define USER_LABEL_PREFIX ""
 255 #endif
 256
 257 /* If the target supports weak symbols, define TARGET_ATTRIBUTE_WEAK to
 258    provide a weak attribute.  Else define it to nothing.
 259
 260    This would normally belong in ansidecl.h, but SUPPORTS_WEAK is
 261    not available at that time.
 262
 263    Note, this is only for use by target files which we know are to be
 264    compiled by GCC.  */
 265 #ifndef TARGET_ATTRIBUTE_WEAK
 266 # if SUPPORTS_WEAK
 267 #  define TARGET_ATTRIBUTE_WEAK __attribute__ ((weak))
 268 # else
 269 #  define TARGET_ATTRIBUTE_WEAK
 270 # endif
 271 #endif
 272
 273 /* This determines whether this target supports hidden visibility.
 274    This is a weaker condition than HAVE_GAS_HIDDEN, which probes for
 275    specific assembler syntax. */
 276 #ifndef TARGET_SUPPORTS_HIDDEN
 277 # ifdef HAVE_GAS_HIDDEN
 278 #  define TARGET_SUPPORTS_HIDDEN 1
 279 # else
 280 #  define TARGET_SUPPORTS_HIDDEN 0
 281 # endif
 282 #endif
 283
 284 /* Determines whether we may use common symbols to represent one-only
 285    semantics (a.k.a. "vague linkage"). */
 286 #ifndef USE_COMMON_FOR_ONE_ONLY
 287 # define USE_COMMON_FOR_ONE_ONLY 1
 288 #endif
 289
 290
 291 /* If the target supports init_priority C++ attribute, give
 292    SUPPORTS_INIT_PRIORITY a nonzero value.  */
 293 #ifndef SUPPORTS_INIT_PRIORITY
 294 #define SUPPORTS_INIT_PRIORITY 1
 295 #endif /* SUPPORTS_INIT_PRIORITY */
 296
 297 /* If duplicate library search directories can be removed from a
 298    linker command without changing the linker's semantics, give this
 299    symbol a nonzero.  */
 300 #ifndef LINK_ELIMINATE_DUPLICATE_LDIRECTORIES
 301 #define LINK_ELIMINATE_DUPLICATE_LDIRECTORIES 0
 302 #endif /* LINK_ELIMINATE_DUPLICATE_LDIRECTORIES */
 303
 304 /* If we have a definition of INCOMING_RETURN_ADDR_RTX, assume that
 305    the rest of the DWARF 2 frame unwind support is also provided.  */
 306 #if !defined (DWARF2_UNWIND_INFO) && defined (INCOMING_RETURN_ADDR_RTX)
 307 #define DWARF2_UNWIND_INFO 1
 308 #endif
 309
 310 /* If we have named sections, and we're using crtstuff to run ctors,
 311    use them for registering eh frame information.  */
 312 #if defined (TARGET_ASM_NAMED_SECTION) && DWARF2_UNWIND_INFO \
 313     && !defined(EH_FRAME_IN_DATA_SECTION)
 314 #ifndef EH_FRAME_SECTION_NAME
 315 #define EH_FRAME_SECTION_NAME ".eh_frame"
 316 #endif
 317 #endif
 318
 319 /* If we have named section and we support weak symbols, then use the
 320    .jcr section for recording java classes which need to be registered
 321    at program start-up time.  */
 322 #if defined (TARGET_ASM_NAMED_SECTION) && SUPPORTS_WEAK
 323 #ifndef JCR_SECTION_NAME
 324 #define JCR_SECTION_NAME ".jcr"
 325 #endif
 326 #endif
 327
 328 /* By default, we generate a label at the beginning and end of the
 329    text section, and compute the size of the text section by
 330    subtracting the two.  However, on some platforms that doesn't
 331    work, and we use the section itself, rather than a label at the
 332    beginning of it, to indicate the start of the section.  On such
 333    platforms, define this to zero.  */
 334 #ifndef DWARF2_GENERATE_TEXT_SECTION_LABEL
 335 #define DWARF2_GENERATE_TEXT_SECTION_LABEL 1
 336 #endif
 337
 338 /* Number of hardware registers that go into the DWARF-2 unwind info.
 339    If not defined, equals FIRST_PSEUDO_REGISTER  */
 340
 341 #ifndef DWARF_FRAME_REGISTERS
 342 #define DWARF_FRAME_REGISTERS FIRST_PSEUDO_REGISTER
 343 #endif
 344
 345 /* How to renumber registers for dbx and gdb.  If not defined, assume
 346    no renumbering is necessary.  */
 347
 348 #ifndef DBX_REGISTER_NUMBER
 349 #define DBX_REGISTER_NUMBER(REGNO) (REGNO)
 350 #endif
 351
 352 /* Default sizes for base C types.  If the sizes are different for
 353    your target, you should override these values by defining the
 354    appropriate symbols in your tm.h file.  */
 355
 356 #ifndef BITS_PER_UNIT
 357 #define BITS_PER_UNIT 8
 358 #endif
 359
 360 #ifndef BITS_PER_WORD
 361 #define BITS_PER_WORD (BITS_PER_UNIT * UNITS_PER_WORD)
 362 #endif
 363
 364 #ifndef CHAR_TYPE_SIZE
 365 #define CHAR_TYPE_SIZE BITS_PER_UNIT
 366 #endif
 367
 368 #ifndef BOOL_TYPE_SIZE
 369 /* `bool' has size and alignment `1', on almost all platforms.  */
 370 #define BOOL_TYPE_SIZE CHAR_TYPE_SIZE
 371 #endif
 372
 373 #ifndef SHORT_TYPE_SIZE
 374 #define SHORT_TYPE_SIZE (BITS_PER_UNIT * MIN ((UNITS_PER_WORD + 1) / 2, 2))
 375 #endif
 376
 377 #ifndef INT_TYPE_SIZE
 378 #define INT_TYPE_SIZE BITS_PER_WORD
 379 #endif
 380
 381 #ifndef LONG_TYPE_SIZE
 382 #define LONG_TYPE_SIZE BITS_PER_WORD
 383 #endif
 384
 385 #ifndef LONG_LONG_TYPE_SIZE
 386 #define LONG_LONG_TYPE_SIZE (BITS_PER_WORD * 2)
 387 #endif
 388
 389 #ifndef WCHAR_TYPE_SIZE
 390 #define WCHAR_TYPE_SIZE INT_TYPE_SIZE
 391 #endif
 392
 393 #ifndef FLOAT_TYPE_SIZE
 394 #define FLOAT_TYPE_SIZE BITS_PER_WORD
 395 #endif
 396
 397 #ifndef DOUBLE_TYPE_SIZE
 398 #define DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
 399 #endif
 400
 401 #ifndef LONG_DOUBLE_TYPE_SIZE
 402 #define LONG_DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
 403 #endif
 404
 405 /* Width in bits of a pointer.  Mind the value of the macro `Pmode'.  */
 406 #ifndef POINTER_SIZE
 407 #define POINTER_SIZE BITS_PER_WORD
 408 #endif
 409
 410 #ifndef PIC_OFFSET_TABLE_REGNUM
 411 #define PIC_OFFSET_TABLE_REGNUM INVALID_REGNUM
 412 #endif
 413
 414 /* By default, the preprocessor should be invoked the same way in C++
 415    as in C.  */
 416 #ifndef CPLUSPLUS_CPP_SPEC
 417 #ifdef CPP_SPEC
 418 #define CPLUSPLUS_CPP_SPEC CPP_SPEC
 419 #endif
 420 #endif
 421
 422 #ifndef ACCUMULATE_OUTGOING_ARGS
 423 #define ACCUMULATE_OUTGOING_ARGS 0
 424 #endif
 425
 426 /* Supply a default definition for PUSH_ARGS.  */
 427 #ifndef PUSH_ARGS
 428 #ifdef PUSH_ROUNDING
 429 #define PUSH_ARGS       !ACCUMULATE_OUTGOING_ARGS
 430 #else
 431 #define PUSH_ARGS       0
 432 #endif
 433 #endif
 434
 435 /* Decide whether a function's arguments should be processed
 436    from first to last or from last to first.
 437
 438    They should if the stack and args grow in opposite directions, but
 439    only if we have push insns.  */
 440
 441 #ifdef PUSH_ROUNDING
 442
 443 #ifndef PUSH_ARGS_REVERSED
 444 #if defined (STACK_GROWS_DOWNWARD) != defined (ARGS_GROW_DOWNWARD)
 445 #define PUSH_ARGS_REVERSED  PUSH_ARGS
 446 #endif
 447 #endif
 448
 449 #endif
 450
 451 #ifndef PUSH_ARGS_REVERSED
 452 #define PUSH_ARGS_REVERSED 0
 453 #endif
 454
 455 /* If PREFERRED_STACK_BOUNDARY is not defined, set it to STACK_BOUNDARY.
 456    STACK_BOUNDARY is required.  */
 457 #ifndef PREFERRED_STACK_BOUNDARY
 458 #define PREFERRED_STACK_BOUNDARY STACK_BOUNDARY
 459 #endif
 460
 461 /* By default, the C++ compiler will use function addresses in the
 462    vtable entries.  Setting this nonzero tells the compiler to use
 463    function descriptors instead.  The value of this macro says how
 464    many words wide the descriptor is (normally 2).  It is assumed
 465    that the address of a function descriptor may be treated as a
 466    pointer to a function.  */
 467 #ifndef TARGET_VTABLE_USES_DESCRIPTORS
 468 #define TARGET_VTABLE_USES_DESCRIPTORS 0
 469 #endif
 470
 471 /* By default, the vtable entries are void pointers, the so the alignment
 472    is the same as pointer alignment.  The value of this macro specifies
 473    the alignment of the vtable entry in bits.  It should be defined only
 474    when special alignment is necessary.  */
 475 #ifndef TARGET_VTABLE_ENTRY_ALIGN
 476 #define TARGET_VTABLE_ENTRY_ALIGN POINTER_SIZE
 477 #endif
 478
 479 /* There are a few non-descriptor entries in the vtable at offsets below
 480    zero.  If these entries must be padded (say, to preserve the alignment
 481    specified by TARGET_VTABLE_ENTRY_ALIGN), set this to the number of
 482    words in each data entry.  */
 483 #ifndef TARGET_VTABLE_DATA_ENTRY_DISTANCE
 484 #define TARGET_VTABLE_DATA_ENTRY_DISTANCE 1
 485 #endif
 486
 487 /* Select a format to encode pointers in exception handling data.  We
 488    prefer those that result in fewer dynamic relocations.  Assume no
 489    special support here and encode direct references.  */
 490 #ifndef ASM_PREFERRED_EH_DATA_FORMAT
 491 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE,GLOBAL)  DW_EH_PE_absptr
 492 #endif
 493
 494 /* By default, the C++ compiler will use the lowest bit of the pointer
 495    to function to indicate a pointer-to-member-function points to a
 496    virtual member function.  However, if FUNCTION_BOUNDARY indicates
 497    function addresses aren't always even, the lowest bit of the delta
 498    field will be used.  */
 499 #ifndef TARGET_PTRMEMFUNC_VBIT_LOCATION
 500 #define TARGET_PTRMEMFUNC_VBIT_LOCATION \
 501   (FUNCTION_BOUNDARY >= 2 * BITS_PER_UNIT \
 502    ? ptrmemfunc_vbit_in_pfn : ptrmemfunc_vbit_in_delta)
 503 #endif
 504
 505 #ifndef DEFAULT_GDB_EXTENSIONS
 506 #define DEFAULT_GDB_EXTENSIONS 1
 507 #endif
 508
 509 /* If more than one debugging type is supported, you must define
 510    PREFERRED_DEBUGGING_TYPE to choose a format in a system-dependent way.
 511
 512    This is one long line cause VAXC can't handle a \-newline.  */
 513 #if 1 < (defined (DBX_DEBUGGING_INFO) + defined (SDB_DEBUGGING_INFO) + defined (DWARF2_DEBUGGING_INFO) + defined (XCOFF_DEBUGGING_INFO) + defined (VMS_DEBUGGING_INFO))
 514 #ifndef PREFERRED_DEBUGGING_TYPE
 515 You Lose!  You must define PREFERRED_DEBUGGING_TYPE!
 516 #endif /* no PREFERRED_DEBUGGING_TYPE */
 517 #else /* Only one debugging format supported.  Define PREFERRED_DEBUGGING_TYPE
 518          so other code needn't care.  */
 519 #ifdef DBX_DEBUGGING_INFO
 520 #define PREFERRED_DEBUGGING_TYPE DBX_DEBUG
 521 #endif
 522 #ifdef SDB_DEBUGGING_INFO
 523 #define PREFERRED_DEBUGGING_TYPE SDB_DEBUG
 524 #endif
 525 #ifdef DWARF_DEBUGGING_INFO
 526 #define PREFERRED_DEBUGGING_TYPE DWARF_DEBUG
 527 #endif
 528 #ifdef DWARF2_DEBUGGING_INFO
 529 #define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
 530 #endif
 531 #ifdef VMS_DEBUGGING_INFO
 532 #define PREFERRED_DEBUGGING_TYPE VMS_AND_DWARF2_DEBUG
 533 #endif
 534 #ifdef XCOFF_DEBUGGING_INFO
 535 #define PREFERRED_DEBUGGING_TYPE XCOFF_DEBUG
 536 #endif
 537 #endif /* More than one debugger format enabled.  */
 538
 539 /* If still not defined, must have been because no debugging formats
 540    are supported.  */
 541 #ifndef PREFERRED_DEBUGGING_TYPE
 542 #define PREFERRED_DEBUGGING_TYPE NO_DEBUG
 543 #endif
 544
 545 /* Define codes for all the float formats that we know of.  */
 546 #define UNKNOWN_FLOAT_FORMAT 0
 547 #define IEEE_FLOAT_FORMAT 1
 548 #define VAX_FLOAT_FORMAT 2
 549 #define IBM_FLOAT_FORMAT 3
 550 #define C4X_FLOAT_FORMAT 4
 551
 552 /* Default to IEEE float if not specified.  Nearly all machines use it.  */
 553 #ifndef TARGET_FLOAT_FORMAT
 554 #define TARGET_FLOAT_FORMAT     IEEE_FLOAT_FORMAT
 555 #endif
 556
 557 /* Determine the register class for registers suitable to be the base
 558    address register in a MEM.  Allow the choice to be dependent upon
 559    the mode of the memory access.  */
 560 #ifndef MODE_BASE_REG_CLASS
 561 #define MODE_BASE_REG_CLASS(MODE) BASE_REG_CLASS
 562 #endif
 563
 564 #ifndef LARGEST_EXPONENT_IS_NORMAL
 565 #define LARGEST_EXPONENT_IS_NORMAL(SIZE) 0
 566 #endif
 567
 568 #ifndef ROUND_TOWARDS_ZERO
 569 #define ROUND_TOWARDS_ZERO 0
 570 #endif
 571
 572 #ifndef MODE_HAS_NANS
 573 #define MODE_HAS_NANS(MODE)                                     \
 574   (FLOAT_MODE_P (MODE)                                          \
 575    && TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT                  \
 576    && !LARGEST_EXPONENT_IS_NORMAL (GET_MODE_BITSIZE (MODE)))
 577 #endif
 578
 579 #ifndef MODE_HAS_INFINITIES
 580 #define MODE_HAS_INFINITIES(MODE)                               \
 581   (FLOAT_MODE_P (MODE)                                          \
 582    && TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT                  \
 583    && !LARGEST_EXPONENT_IS_NORMAL (GET_MODE_BITSIZE (MODE)))
 584 #endif
 585
 586 #ifndef MODE_HAS_SIGNED_ZEROS
 587 #define MODE_HAS_SIGNED_ZEROS(MODE) \
 588   (FLOAT_MODE_P (MODE) && TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT)
 589 #endif
 590
 591 #ifndef MODE_HAS_SIGN_DEPENDENT_ROUNDING
 592 #define MODE_HAS_SIGN_DEPENDENT_ROUNDING(MODE)                  \
 593   (FLOAT_MODE_P (MODE)                                          \
 594    && TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT                  \
 595    && !ROUND_TOWARDS_ZERO)
 596 #endif
 597
 598 #ifndef FLOAT_LIB_COMPARE_RETURNS_BOOL
 599 #define FLOAT_LIB_COMPARE_RETURNS_BOOL(MODE, COMPARISON) false
 600 #endif
 601
 602 /* If FLOAT_WORDS_BIG_ENDIAN is not defined in the header files,
 603    then the word-endianness is the same as for integers.  */
 604 #ifndef FLOAT_WORDS_BIG_ENDIAN
 605 #define FLOAT_WORDS_BIG_ENDIAN WORDS_BIG_ENDIAN
 606 #endif
 607
 608 #ifndef TARGET_FLT_EVAL_METHOD
 609 #define TARGET_FLT_EVAL_METHOD 0
 610 #endif
 611
 612 #ifndef HOT_TEXT_SECTION_NAME
 613 #define HOT_TEXT_SECTION_NAME "text.hot"
 614 #endif
 615
 616 #ifndef UNLIKELY_EXECUTED_TEXT_SECTION_NAME
 617 #define UNLIKELY_EXECUTED_TEXT_SECTION_NAME "text.unlikely"
 618 #endif
 619
 620 #ifndef VECTOR_MODE_SUPPORTED_P
 621 #define VECTOR_MODE_SUPPORTED_P(MODE) 0
 622 #endif
 623
 624 /* Determine whether __cxa_atexit, rather than atexit, is used to
 625    register C++ destructors for local statics and global objects.  */
 626 #ifndef DEFAULT_USE_CXA_ATEXIT
 627 #define DEFAULT_USE_CXA_ATEXIT 0
 628 #endif
 629
 630 /* Determine whether extra constraint letter should be handled
 631    via address reload (like 'o').  */
 632 #ifndef EXTRA_MEMORY_CONSTRAINT
 633 #define EXTRA_MEMORY_CONSTRAINT(C,STR) 0
 634 #endif
 635
 636 /* Determine whether extra constraint letter should be handled
 637    as an address (like 'p').  */
 638 #ifndef EXTRA_ADDRESS_CONSTRAINT
 639 #define EXTRA_ADDRESS_CONSTRAINT(C,STR) 0
 640 #endif
 641
 642 /* When a port defines CONSTRAINT_LEN, it should use DEFAULT_CONSTRAINT_LEN
 643    for all the characters that it does not want to change, so things like the
 644   'length' of a digit in a matching constraint is an implementation detail,
 645    and not part of the interface.  */
 646 #define DEFAULT_CONSTRAINT_LEN(C,STR) 1
 647
 648 #ifndef CONSTRAINT_LEN
 649 #define CONSTRAINT_LEN(C,STR) DEFAULT_CONSTRAINT_LEN (C, STR)
 650 #endif
 651
 652 #if defined (CONST_OK_FOR_LETTER_P) && ! defined (CONST_OK_FOR_CONSTRAINT_P)
 653 #define CONST_OK_FOR_CONSTRAINT_P(VAL,C,STR) CONST_OK_FOR_LETTER_P (VAL, C)
 654 #endif
 655
 656 #if defined (CONST_DOUBLE_OK_FOR_LETTER_P) && ! defined (CONST_DOUBLE_OK_FOR_CONSTRAINT_P)
 657 #define CONST_DOUBLE_OK_FOR_CONSTRAINT_P(OP,C,STR) \
 658   CONST_DOUBLE_OK_FOR_LETTER_P (OP, C)
 659 #endif
 660
 661 #ifndef REG_CLASS_FROM_CONSTRAINT
 662 #define REG_CLASS_FROM_CONSTRAINT(C,STR) REG_CLASS_FROM_LETTER (C)
 663 #endif
 664
 665 #if defined (EXTRA_CONSTRAINT) && ! defined (EXTRA_CONSTRAINT_STR)
 666 #define EXTRA_CONSTRAINT_STR(OP, C,STR) EXTRA_CONSTRAINT (OP, C)
 667 #endif
 668
 669 #ifndef REGISTER_MOVE_COST
 670 #define REGISTER_MOVE_COST(m, x, y) 2
 671 #endif
 672
 673 /* Determine whether the the entire c99 runtime
 674    is present in the runtime library.  */
 675 #ifndef TARGET_C99_FUNCTIONS
 676 #define TARGET_C99_FUNCTIONS 0
 677 #endif
 678
 679 /* Indicate that CLZ and CTZ are undefined at zero.  */
 680 #ifndef CLZ_DEFINED_VALUE_AT_ZERO
 681 #define CLZ_DEFINED_VALUE_AT_ZERO(MODE, VALUE)  0
 682 #endif
 683 #ifndef CTZ_DEFINED_VALUE_AT_ZERO
 684 #define CTZ_DEFINED_VALUE_AT_ZERO(MODE, VALUE)  0
 685 #endif
 686
 687 /* Provide a default value for STORE_FLAG_VALUE.  */
 688 #ifndef STORE_FLAG_VALUE
 689 #define STORE_FLAG_VALUE  1
 690 #endif
 691
 692 /* This macro is used to determine what the largest unit size that
 693    move_by_pieces can use is.  */
 694
 695 /* MOVE_MAX_PIECES is the number of bytes at a time which we can
 696    move efficiently, as opposed to  MOVE_MAX which is the maximum
 697    number of bytes we can move with a single instruction.  */
 698
 699 #ifndef MOVE_MAX_PIECES
 700 #define MOVE_MAX_PIECES   MOVE_MAX
 701 #endif
 702
 703 #ifndef STACK_POINTER_OFFSET
 704 #define STACK_POINTER_OFFSET    0
 705 #endif
 706
 707 #ifndef LOCAL_REGNO
 708 #define LOCAL_REGNO(REGNO)  0
 709 #endif
 710
 711 /* EXIT_IGNORE_STACK should be nonzero if, when returning from a function,
 712    the stack pointer does not matter.  The value is tested only in
 713    functions that have frame pointers.  */
 714 #ifndef EXIT_IGNORE_STACK
 715 #define EXIT_IGNORE_STACK 0
 716 #endif
 717
 718 /* Assume that case vectors are not pc-relative.  */
 719 #ifndef CASE_VECTOR_PC_RELATIVE
 720 #define CASE_VECTOR_PC_RELATIVE 0
 721 #endif
 722
 723 /* Register mappings for target machines without register windows.  */
 724 #ifndef INCOMING_REGNO
 725 #define INCOMING_REGNO(N) (N)
 726 #endif
 727
 728 #ifndef OUTGOING_REGNO
 729 #define OUTGOING_REGNO(N) (N)
 730 #endif
 731
 732 #ifndef SHIFT_COUNT_TRUNCATED
 733 #define SHIFT_COUNT_TRUNCATED 0
 734 #endif
 735
 736 #ifndef LEGITIMIZE_ADDRESS
 737 #define LEGITIMIZE_ADDRESS(X, OLDX, MODE, WIN)
 738 #endif
 739
 740 #ifndef REVERSIBLE_CC_MODE
 741 #define REVERSIBLE_CC_MODE(MODE) 0
 742 #endif
 743
 744 #endif  /* ! GCC_DEFAULTS_H */