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 /* This determines whether weak symbols must be left out of a static
 242    archive's table of contents.  Defining this macro to be nonzero has
 243    the consequence that certain symbols will not be made weak that
 244    otherwise would be.  The C++ ABI requires this macro to be zero;
 245    see the documentation. */
 246 #ifndef TARGET_WEAK_NOT_IN_ARCHIVE_TOC
 247 #define TARGET_WEAK_NOT_IN_ARCHIVE_TOC 0
 248 #endif
 249
 250 /* This determines whether or not we need linkonce unwind information */
 251 #ifndef TARGET_USES_WEAK_UNWIND_INFO
 252 #define TARGET_USES_WEAK_UNWIND_INFO 0
 253 #endif
 254
 255 /* By default, there is no prefix on user-defined symbols.  */
 256 #ifndef USER_LABEL_PREFIX
 257 #define USER_LABEL_PREFIX ""
 258 #endif
 259
 260 /* If the target supports weak symbols, define TARGET_ATTRIBUTE_WEAK to
 261    provide a weak attribute.  Else define it to nothing.
 262
 263    This would normally belong in ansidecl.h, but SUPPORTS_WEAK is
 264    not available at that time.
 265
 266    Note, this is only for use by target files which we know are to be
 267    compiled by GCC.  */
 268 #ifndef TARGET_ATTRIBUTE_WEAK
 269 # if SUPPORTS_WEAK
 270 #  define TARGET_ATTRIBUTE_WEAK __attribute__ ((weak))
 271 # else
 272 #  define TARGET_ATTRIBUTE_WEAK
 273 # endif
 274 #endif
 275
 276 /* This determines whether this target supports hidden visibility.
 277    This is a weaker condition than HAVE_GAS_HIDDEN, which probes for
 278    specific assembler syntax.  */
 279 #ifndef TARGET_SUPPORTS_HIDDEN
 280 # ifdef HAVE_GAS_HIDDEN
 281 #  define TARGET_SUPPORTS_HIDDEN 1
 282 # else
 283 #  define TARGET_SUPPORTS_HIDDEN 0
 284 # endif
 285 #endif
 286
 287 /* Determines whether we may use common symbols to represent one-only
 288    semantics (a.k.a. "vague linkage").  */
 289 #ifndef USE_COMMON_FOR_ONE_ONLY
 290 # define USE_COMMON_FOR_ONE_ONLY 1
 291 #endif
 292
 293
 294 /* If the target supports init_priority C++ attribute, give
 295    SUPPORTS_INIT_PRIORITY a nonzero value.  */
 296 #ifndef SUPPORTS_INIT_PRIORITY
 297 #define SUPPORTS_INIT_PRIORITY 1
 298 #endif /* SUPPORTS_INIT_PRIORITY */
 299
 300 /* If duplicate library search directories can be removed from a
 301    linker command without changing the linker's semantics, give this
 302    symbol a nonzero.  */
 303 #ifndef LINK_ELIMINATE_DUPLICATE_LDIRECTORIES
 304 #define LINK_ELIMINATE_DUPLICATE_LDIRECTORIES 0
 305 #endif /* LINK_ELIMINATE_DUPLICATE_LDIRECTORIES */
 306
 307 /* If we have a definition of INCOMING_RETURN_ADDR_RTX, assume that
 308    the rest of the DWARF 2 frame unwind support is also provided.  */
 309 #if !defined (DWARF2_UNWIND_INFO) && defined (INCOMING_RETURN_ADDR_RTX)
 310 #define DWARF2_UNWIND_INFO 1
 311 #endif
 312
 313 /* If we have named sections, and we're using crtstuff to run ctors,
 314    use them for registering eh frame information.  */
 315 #if defined (TARGET_ASM_NAMED_SECTION) && DWARF2_UNWIND_INFO \
 316     && !defined(EH_FRAME_IN_DATA_SECTION)
 317 #ifndef EH_FRAME_SECTION_NAME
 318 #define EH_FRAME_SECTION_NAME ".eh_frame"
 319 #endif
 320 #endif
 321
 322 /* If we have named section and we support weak symbols, then use the
 323    .jcr section for recording java classes which need to be registered
 324    at program start-up time.  */
 325 #if defined (TARGET_ASM_NAMED_SECTION) && SUPPORTS_WEAK
 326 #ifndef JCR_SECTION_NAME
 327 #define JCR_SECTION_NAME ".jcr"
 328 #endif
 329 #endif
 330
 331 /* By default, we generate a label at the beginning and end of the
 332    text section, and compute the size of the text section by
 333    subtracting the two.  However, on some platforms that doesn't
 334    work, and we use the section itself, rather than a label at the
 335    beginning of it, to indicate the start of the section.  On such
 336    platforms, define this to zero.  */
 337 #ifndef DWARF2_GENERATE_TEXT_SECTION_LABEL
 338 #define DWARF2_GENERATE_TEXT_SECTION_LABEL 1
 339 #endif
 340
 341 /* Number of hardware registers that go into the DWARF-2 unwind info.
 342    If not defined, equals FIRST_PSEUDO_REGISTER  */
 343
 344 #ifndef DWARF_FRAME_REGISTERS
 345 #define DWARF_FRAME_REGISTERS FIRST_PSEUDO_REGISTER
 346 #endif
 347
 348 /* How to renumber registers for dbx and gdb.  If not defined, assume
 349    no renumbering is necessary.  */
 350
 351 #ifndef DBX_REGISTER_NUMBER
 352 #define DBX_REGISTER_NUMBER(REGNO) (REGNO)
 353 #endif
 354
 355 /* Default sizes for base C types.  If the sizes are different for
 356    your target, you should override these values by defining the
 357    appropriate symbols in your tm.h file.  */
 358
 359 #ifndef BITS_PER_UNIT
 360 #define BITS_PER_UNIT 8
 361 #endif
 362
 363 #ifndef BITS_PER_WORD
 364 #define BITS_PER_WORD (BITS_PER_UNIT * UNITS_PER_WORD)
 365 #endif
 366
 367 #ifndef CHAR_TYPE_SIZE
 368 #define CHAR_TYPE_SIZE BITS_PER_UNIT
 369 #endif
 370
 371 #ifndef BOOL_TYPE_SIZE
 372 /* `bool' has size and alignment `1', on almost all platforms.  */
 373 #define BOOL_TYPE_SIZE CHAR_TYPE_SIZE
 374 #endif
 375
 376 #ifndef SHORT_TYPE_SIZE
 377 #define SHORT_TYPE_SIZE (BITS_PER_UNIT * MIN ((UNITS_PER_WORD + 1) / 2, 2))
 378 #endif
 379
 380 #ifndef INT_TYPE_SIZE
 381 #define INT_TYPE_SIZE BITS_PER_WORD
 382 #endif
 383
 384 #ifndef LONG_TYPE_SIZE
 385 #define LONG_TYPE_SIZE BITS_PER_WORD
 386 #endif
 387
 388 #ifndef LONG_LONG_TYPE_SIZE
 389 #define LONG_LONG_TYPE_SIZE (BITS_PER_WORD * 2)
 390 #endif
 391
 392 #ifndef WCHAR_TYPE_SIZE
 393 #define WCHAR_TYPE_SIZE INT_TYPE_SIZE
 394 #endif
 395
 396 #ifndef FLOAT_TYPE_SIZE
 397 #define FLOAT_TYPE_SIZE BITS_PER_WORD
 398 #endif
 399
 400 #ifndef DOUBLE_TYPE_SIZE
 401 #define DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
 402 #endif
 403
 404 #ifndef LONG_DOUBLE_TYPE_SIZE
 405 #define LONG_DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
 406 #endif
 407
 408 /* Width in bits of a pointer.  Mind the value of the macro `Pmode'.  */
 409 #ifndef POINTER_SIZE
 410 #define POINTER_SIZE BITS_PER_WORD
 411 #endif
 412
 413 #ifndef PIC_OFFSET_TABLE_REGNUM
 414 #define PIC_OFFSET_TABLE_REGNUM INVALID_REGNUM
 415 #endif
 416
 417 /* By default, the preprocessor should be invoked the same way in C++
 418    as in C.  */
 419 #ifndef CPLUSPLUS_CPP_SPEC
 420 #ifdef CPP_SPEC
 421 #define CPLUSPLUS_CPP_SPEC CPP_SPEC
 422 #endif
 423 #endif
 424
 425 #ifndef ACCUMULATE_OUTGOING_ARGS
 426 #define ACCUMULATE_OUTGOING_ARGS 0
 427 #endif
 428
 429 /* Supply a default definition for PUSH_ARGS.  */
 430 #ifndef PUSH_ARGS
 431 #ifdef PUSH_ROUNDING
 432 #define PUSH_ARGS       !ACCUMULATE_OUTGOING_ARGS
 433 #else
 434 #define PUSH_ARGS       0
 435 #endif
 436 #endif
 437
 438 /* Decide whether a function's arguments should be processed
 439    from first to last or from last to first.
 440
 441    They should if the stack and args grow in opposite directions, but
 442    only if we have push insns.  */
 443
 444 #ifdef PUSH_ROUNDING
 445
 446 #ifndef PUSH_ARGS_REVERSED
 447 #if defined (STACK_GROWS_DOWNWARD) != defined (ARGS_GROW_DOWNWARD)
 448 #define PUSH_ARGS_REVERSED  PUSH_ARGS
 449 #endif
 450 #endif
 451
 452 #endif
 453
 454 #ifndef PUSH_ARGS_REVERSED
 455 #define PUSH_ARGS_REVERSED 0
 456 #endif
 457
 458 /* If PREFERRED_STACK_BOUNDARY is not defined, set it to STACK_BOUNDARY.
 459    STACK_BOUNDARY is required.  */
 460 #ifndef PREFERRED_STACK_BOUNDARY
 461 #define PREFERRED_STACK_BOUNDARY STACK_BOUNDARY
 462 #endif
 463
 464 /* By default, the C++ compiler will use function addresses in the
 465    vtable entries.  Setting this nonzero tells the compiler to use
 466    function descriptors instead.  The value of this macro says how
 467    many words wide the descriptor is (normally 2).  It is assumed
 468    that the address of a function descriptor may be treated as a
 469    pointer to a function.  */
 470 #ifndef TARGET_VTABLE_USES_DESCRIPTORS
 471 #define TARGET_VTABLE_USES_DESCRIPTORS 0
 472 #endif
 473
 474 /* By default, the vtable entries are void pointers, the so the alignment
 475    is the same as pointer alignment.  The value of this macro specifies
 476    the alignment of the vtable entry in bits.  It should be defined only
 477    when special alignment is necessary.  */
 478 #ifndef TARGET_VTABLE_ENTRY_ALIGN
 479 #define TARGET_VTABLE_ENTRY_ALIGN POINTER_SIZE
 480 #endif
 481
 482 /* There are a few non-descriptor entries in the vtable at offsets below
 483    zero.  If these entries must be padded (say, to preserve the alignment
 484    specified by TARGET_VTABLE_ENTRY_ALIGN), set this to the number of
 485    words in each data entry.  */
 486 #ifndef TARGET_VTABLE_DATA_ENTRY_DISTANCE
 487 #define TARGET_VTABLE_DATA_ENTRY_DISTANCE 1
 488 #endif
 489
 490 /* Decide whether it is safe to use a local alias for a virtual function
 491    when constructing thunks.  */
 492 #ifndef TARGET_USE_LOCAL_THUNK_ALIAS_P
 493 #ifdef ASM_OUTPUT_DEF
 494 #define TARGET_USE_LOCAL_THUNK_ALIAS_P(DECL) 1
 495 #else
 496 #define TARGET_USE_LOCAL_THUNK_ALIAS_P(DECL) 0
 497 #endif
 498 #endif
 499
 500 /* Select a format to encode pointers in exception handling data.  We
 501    prefer those that result in fewer dynamic relocations.  Assume no
 502    special support here and encode direct references.  */
 503 #ifndef ASM_PREFERRED_EH_DATA_FORMAT
 504 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE,GLOBAL)  DW_EH_PE_absptr
 505 #endif
 506
 507 /* By default, the C++ compiler will use the lowest bit of the pointer
 508    to function to indicate a pointer-to-member-function points to a
 509    virtual member function.  However, if FUNCTION_BOUNDARY indicates
 510    function addresses aren't always even, the lowest bit of the delta
 511    field will be used.  */
 512 #ifndef TARGET_PTRMEMFUNC_VBIT_LOCATION
 513 #define TARGET_PTRMEMFUNC_VBIT_LOCATION \
 514   (FUNCTION_BOUNDARY >= 2 * BITS_PER_UNIT \
 515    ? ptrmemfunc_vbit_in_pfn : ptrmemfunc_vbit_in_delta)
 516 #endif
 517
 518 #ifndef DEFAULT_GDB_EXTENSIONS
 519 #define DEFAULT_GDB_EXTENSIONS 1
 520 #endif
 521
 522 /* If more than one debugging type is supported, you must define
 523    PREFERRED_DEBUGGING_TYPE to choose a format in a system-dependent way.
 524
 525    This is one long line cause VAXC can't handle a \-newline.  */
 526 #if 1 < (defined (DBX_DEBUGGING_INFO) + defined (SDB_DEBUGGING_INFO) + defined (DWARF2_DEBUGGING_INFO) + defined (XCOFF_DEBUGGING_INFO) + defined (VMS_DEBUGGING_INFO))
 527 #ifndef PREFERRED_DEBUGGING_TYPE
 528 You Lose!  You must define PREFERRED_DEBUGGING_TYPE!
 529 #endif /* no PREFERRED_DEBUGGING_TYPE */
 530 #else /* Only one debugging format supported.  Define PREFERRED_DEBUGGING_TYPE
 531          so other code needn't care.  */
 532 #ifdef DBX_DEBUGGING_INFO
 533 #define PREFERRED_DEBUGGING_TYPE DBX_DEBUG
 534 #endif
 535 #ifdef SDB_DEBUGGING_INFO
 536 #define PREFERRED_DEBUGGING_TYPE SDB_DEBUG
 537 #endif
 538 #ifdef DWARF_DEBUGGING_INFO
 539 #define PREFERRED_DEBUGGING_TYPE DWARF_DEBUG
 540 #endif
 541 #ifdef DWARF2_DEBUGGING_INFO
 542 #define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
 543 #endif
 544 #ifdef VMS_DEBUGGING_INFO
 545 #define PREFERRED_DEBUGGING_TYPE VMS_AND_DWARF2_DEBUG
 546 #endif
 547 #ifdef XCOFF_DEBUGGING_INFO
 548 #define PREFERRED_DEBUGGING_TYPE XCOFF_DEBUG
 549 #endif
 550 #endif /* More than one debugger format enabled.  */
 551
 552 /* If still not defined, must have been because no debugging formats
 553    are supported.  */
 554 #ifndef PREFERRED_DEBUGGING_TYPE
 555 #define PREFERRED_DEBUGGING_TYPE NO_DEBUG
 556 #endif
 557
 558 /* Define codes for all the float formats that we know of.  */
 559 #define UNKNOWN_FLOAT_FORMAT 0
 560 #define IEEE_FLOAT_FORMAT 1
 561 #define VAX_FLOAT_FORMAT 2
 562 #define IBM_FLOAT_FORMAT 3
 563 #define C4X_FLOAT_FORMAT 4
 564
 565 /* Default to IEEE float if not specified.  Nearly all machines use it.  */
 566 #ifndef TARGET_FLOAT_FORMAT
 567 #define TARGET_FLOAT_FORMAT     IEEE_FLOAT_FORMAT
 568 #endif
 569
 570 /* Determine the register class for registers suitable to be the base
 571    address register in a MEM.  Allow the choice to be dependent upon
 572    the mode of the memory access.  */
 573 #ifndef MODE_BASE_REG_CLASS
 574 #define MODE_BASE_REG_CLASS(MODE) BASE_REG_CLASS
 575 #endif
 576
 577 #ifndef LARGEST_EXPONENT_IS_NORMAL
 578 #define LARGEST_EXPONENT_IS_NORMAL(SIZE) 0
 579 #endif
 580
 581 #ifndef ROUND_TOWARDS_ZERO
 582 #define ROUND_TOWARDS_ZERO 0
 583 #endif
 584
 585 #ifndef MODE_HAS_NANS
 586 #define MODE_HAS_NANS(MODE)                                     \
 587   (FLOAT_MODE_P (MODE)                                          \
 588    && TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT                  \
 589    && !LARGEST_EXPONENT_IS_NORMAL (GET_MODE_BITSIZE (MODE)))
 590 #endif
 591
 592 #ifndef MODE_HAS_INFINITIES
 593 #define MODE_HAS_INFINITIES(MODE)                               \
 594   (FLOAT_MODE_P (MODE)                                          \
 595    && TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT                  \
 596    && !LARGEST_EXPONENT_IS_NORMAL (GET_MODE_BITSIZE (MODE)))
 597 #endif
 598
 599 #ifndef MODE_HAS_SIGNED_ZEROS
 600 #define MODE_HAS_SIGNED_ZEROS(MODE) \
 601   (FLOAT_MODE_P (MODE) && TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT)
 602 #endif
 603
 604 #ifndef MODE_HAS_SIGN_DEPENDENT_ROUNDING
 605 #define MODE_HAS_SIGN_DEPENDENT_ROUNDING(MODE)                  \
 606   (FLOAT_MODE_P (MODE)                                          \
 607    && TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT                  \
 608    && !ROUND_TOWARDS_ZERO)
 609 #endif
 610
 611 #ifndef FLOAT_LIB_COMPARE_RETURNS_BOOL
 612 #define FLOAT_LIB_COMPARE_RETURNS_BOOL(MODE, COMPARISON) false
 613 #endif
 614
 615 /* If FLOAT_WORDS_BIG_ENDIAN is not defined in the header files,
 616    then the word-endianness is the same as for integers.  */
 617 #ifndef FLOAT_WORDS_BIG_ENDIAN
 618 #define FLOAT_WORDS_BIG_ENDIAN WORDS_BIG_ENDIAN
 619 #endif
 620
 621 #ifndef TARGET_FLT_EVAL_METHOD
 622 #define TARGET_FLT_EVAL_METHOD 0
 623 #endif
 624
 625 #ifndef HOT_TEXT_SECTION_NAME
 626 #define HOT_TEXT_SECTION_NAME ".text.hot"
 627 #endif
 628
 629 #ifndef NORMAL_TEXT_SECTION_NAME
 630 #define NORMAL_TEXT_SECTION_NAME ".text"
 631 #endif
 632
 633 #ifndef UNLIKELY_EXECUTED_TEXT_SECTION_NAME
 634 #define UNLIKELY_EXECUTED_TEXT_SECTION_NAME ".text.unlikely"
 635 #endif
 636
 637 #ifndef HAS_LONG_COND_BRANCH
 638 #define HAS_LONG_COND_BRANCH 0
 639 #endif
 640
 641 #ifndef HAS_LONG_UNCOND_BRANCH
 642 #define HAS_LONG_UNCOND_BRANCH 0
 643 #endif
 644
 645 #ifndef VECTOR_MODE_SUPPORTED_P
 646 #define VECTOR_MODE_SUPPORTED_P(MODE) 0
 647 #endif
 648
 649 /* Determine whether __cxa_atexit, rather than atexit, is used to
 650    register C++ destructors for local statics and global objects.  */
 651 #ifndef DEFAULT_USE_CXA_ATEXIT
 652 #define DEFAULT_USE_CXA_ATEXIT 0
 653 #endif
 654
 655 /* Determine whether extra constraint letter should be handled
 656    via address reload (like 'o').  */
 657 #ifndef EXTRA_MEMORY_CONSTRAINT
 658 #define EXTRA_MEMORY_CONSTRAINT(C,STR) 0
 659 #endif
 660
 661 /* Determine whether extra constraint letter should be handled
 662    as an address (like 'p').  */
 663 #ifndef EXTRA_ADDRESS_CONSTRAINT
 664 #define EXTRA_ADDRESS_CONSTRAINT(C,STR) 0
 665 #endif
 666
 667 /* When a port defines CONSTRAINT_LEN, it should use DEFAULT_CONSTRAINT_LEN
 668    for all the characters that it does not want to change, so things like the
 669   'length' of a digit in a matching constraint is an implementation detail,
 670    and not part of the interface.  */
 671 #define DEFAULT_CONSTRAINT_LEN(C,STR) 1
 672
 673 #ifndef CONSTRAINT_LEN
 674 #define CONSTRAINT_LEN(C,STR) DEFAULT_CONSTRAINT_LEN (C, STR)
 675 #endif
 676
 677 #if defined (CONST_OK_FOR_LETTER_P) && ! defined (CONST_OK_FOR_CONSTRAINT_P)
 678 #define CONST_OK_FOR_CONSTRAINT_P(VAL,C,STR) CONST_OK_FOR_LETTER_P (VAL, C)
 679 #endif
 680
 681 #if defined (CONST_DOUBLE_OK_FOR_LETTER_P) && ! defined (CONST_DOUBLE_OK_FOR_CONSTRAINT_P)
 682 #define CONST_DOUBLE_OK_FOR_CONSTRAINT_P(OP,C,STR) \
 683   CONST_DOUBLE_OK_FOR_LETTER_P (OP, C)
 684 #endif
 685
 686 #ifndef REG_CLASS_FROM_CONSTRAINT
 687 #define REG_CLASS_FROM_CONSTRAINT(C,STR) REG_CLASS_FROM_LETTER (C)
 688 #endif
 689
 690 #if defined (EXTRA_CONSTRAINT) && ! defined (EXTRA_CONSTRAINT_STR)
 691 #define EXTRA_CONSTRAINT_STR(OP, C,STR) EXTRA_CONSTRAINT (OP, C)
 692 #endif
 693
 694 #ifndef REGISTER_MOVE_COST
 695 #define REGISTER_MOVE_COST(m, x, y) 2
 696 #endif
 697
 698 /* Determine whether the the entire c99 runtime
 699    is present in the runtime library.  */
 700 #ifndef TARGET_C99_FUNCTIONS
 701 #define TARGET_C99_FUNCTIONS 0
 702 #endif
 703
 704 /* Indicate that CLZ and CTZ are undefined at zero.  */
 705 #ifndef CLZ_DEFINED_VALUE_AT_ZERO
 706 #define CLZ_DEFINED_VALUE_AT_ZERO(MODE, VALUE)  0
 707 #endif
 708 #ifndef CTZ_DEFINED_VALUE_AT_ZERO
 709 #define CTZ_DEFINED_VALUE_AT_ZERO(MODE, VALUE)  0
 710 #endif
 711
 712 /* Provide a default value for STORE_FLAG_VALUE.  */
 713 #ifndef STORE_FLAG_VALUE
 714 #define STORE_FLAG_VALUE  1
 715 #endif
 716
 717 /* This macro is used to determine what the largest unit size that
 718    move_by_pieces can use is.  */
 719
 720 /* MOVE_MAX_PIECES is the number of bytes at a time which we can
 721    move efficiently, as opposed to  MOVE_MAX which is the maximum
 722    number of bytes we can move with a single instruction.  */
 723
 724 #ifndef MOVE_MAX_PIECES
 725 #define MOVE_MAX_PIECES   MOVE_MAX
 726 #endif
 727
 728 #ifndef STACK_POINTER_OFFSET
 729 #define STACK_POINTER_OFFSET    0
 730 #endif
 731
 732 #ifndef LOCAL_REGNO
 733 #define LOCAL_REGNO(REGNO)  0
 734 #endif
 735
 736 /* EXIT_IGNORE_STACK should be nonzero if, when returning from a function,
 737    the stack pointer does not matter.  The value is tested only in
 738    functions that have frame pointers.  */
 739 #ifndef EXIT_IGNORE_STACK
 740 #define EXIT_IGNORE_STACK 0
 741 #endif
 742
 743 /* Assume that case vectors are not pc-relative.  */
 744 #ifndef CASE_VECTOR_PC_RELATIVE
 745 #define CASE_VECTOR_PC_RELATIVE 0
 746 #endif
 747
 748 /* Assume that trampolines need function alignment.  */
 749 #ifndef TRAMPOLINE_ALIGNMENT
 750 #define TRAMPOLINE_ALIGNMENT FUNCTION_BOUNDARY
 751 #endif
 752
 753 /* Register mappings for target machines without register windows.  */
 754 #ifndef INCOMING_REGNO
 755 #define INCOMING_REGNO(N) (N)
 756 #endif
 757
 758 #ifndef OUTGOING_REGNO
 759 #define OUTGOING_REGNO(N) (N)
 760 #endif
 761
 762 #ifndef SHIFT_COUNT_TRUNCATED
 763 #define SHIFT_COUNT_TRUNCATED 0
 764 #endif
 765
 766 #ifndef LEGITIMIZE_ADDRESS
 767 #define LEGITIMIZE_ADDRESS(X, OLDX, MODE, WIN)
 768 #endif
 769
 770 #ifndef REVERSIBLE_CC_MODE
 771 #define REVERSIBLE_CC_MODE(MODE) 0
 772 #endif
 773
 774 #endif  /* ! GCC_DEFAULTS_H */