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 /* This is how to output an element of a case-vector that is absolute.
  77    Some targets don't use this, but we have to define it anyway.  */
  78
  79 #ifndef ASM_OUTPUT_ADDR_VEC_ELT
  80 #define ASM_OUTPUT_ADDR_VEC_ELT(FILE, VALUE)  \
  81 do { fputs (integer_asm_op (POINTER_SIZE / BITS_PER_UNIT, TRUE), FILE); \
  82      (*targetm.asm_out.internal_label) (FILE, "L", (VALUE));                    \
  83      fputc ('\n', FILE);                                                \
  84    } while (0)
  85 #endif
  86
  87 /* Choose a reasonable default for ASM_OUTPUT_ASCII.  */
  88
  89 #ifndef ASM_OUTPUT_ASCII
  90 #define ASM_OUTPUT_ASCII(MYFILE, MYSTRING, MYLENGTH) \
  91   do {                                                                        \
  92     FILE *_hide_asm_out_file = (MYFILE);                                      \
  93     const unsigned char *_hide_p = (const unsigned char *) (MYSTRING);        \
  94     int _hide_thissize = (MYLENGTH);                                          \
  95     {                                                                         \
  96       FILE *asm_out_file = _hide_asm_out_file;                                \
  97       const unsigned char *p = _hide_p;                                       \
  98       int thissize = _hide_thissize;                                          \
  99       int i;                                                                  \
 100       fprintf (asm_out_file, "\t.ascii \"");                                  \
 101                                                                               \
 102       for (i = 0; i < thissize; i++)                                          \
 103         {                                                                     \
 104           int c = p[i];                                                       \
 105           if (c == '\"' || c == '\\')                                         \
 106             putc ('\\', asm_out_file);                                        \
 107           if (ISPRINT(c))                                                     \
 108             putc (c, asm_out_file);                                           \
 109           else                                                                \
 110             {                                                                 \
 111               fprintf (asm_out_file, "\\%o", c);                              \
 112               /* After an octal-escape, if a digit follows,                   \
 113                  terminate one string constant and start another.             \
 114                  The VAX assembler fails to stop reading the escape           \
 115                  after three digits, so this is the only way we               \
 116                  can get it to parse the data properly.  */                   \
 117               if (i < thissize - 1 && ISDIGIT(p[i + 1]))                      \
 118                 fprintf (asm_out_file, "\"\n\t.ascii \"");                    \
 119           }                                                                   \
 120         }                                                                     \
 121       fprintf (asm_out_file, "\"\n");                                         \
 122     }                                                                         \
 123   }                                                                           \
 124   while (0)
 125 #endif
 126
 127 /* This is how we tell the assembler to equate two values.  */
 128 #ifdef SET_ASM_OP
 129 #ifndef ASM_OUTPUT_DEF
 130 #define ASM_OUTPUT_DEF(FILE,LABEL1,LABEL2)                              \
 131  do {   fprintf ((FILE), "%s", SET_ASM_OP);                             \
 132         assemble_name (FILE, LABEL1);                                   \
 133         fprintf (FILE, ",");                                            \
 134         assemble_name (FILE, LABEL2);                                   \
 135         fprintf (FILE, "\n");                                           \
 136   } while (0)
 137 #endif
 138 #endif
 139
 140 /* This is how to output the definition of a user-level label named
 141    NAME, such as the label on a static function or variable NAME.  */
 142
 143 #ifndef ASM_OUTPUT_LABEL
 144 #define ASM_OUTPUT_LABEL(FILE,NAME) \
 145   do { assemble_name ((FILE), (NAME)); fputs (":\n", (FILE)); } while (0)
 146 #endif
 147
 148 /* This is how to output a reference to a user-level label named NAME.  */
 149
 150 #ifndef ASM_OUTPUT_LABELREF
 151 #define ASM_OUTPUT_LABELREF(FILE,NAME)  asm_fprintf ((FILE), "%U%s", (NAME))
 152 #endif
 153
 154 /* Allow target to print debug info labels specially.  This is useful for
 155    VLIW targets, since debug info labels should go into the middle of
 156    instruction bundles instead of breaking them.  */
 157
 158 #ifndef ASM_OUTPUT_DEBUG_LABEL
 159 #define ASM_OUTPUT_DEBUG_LABEL(FILE, PREFIX, NUM) \
 160   (*targetm.asm_out.internal_label) (FILE, PREFIX, NUM)
 161 #endif
 162
 163 /* This is how we tell the assembler that a symbol is weak.  */
 164 #ifndef ASM_OUTPUT_WEAK_ALIAS
 165 #if defined (ASM_WEAKEN_LABEL) && defined (ASM_OUTPUT_DEF)
 166 #define ASM_OUTPUT_WEAK_ALIAS(STREAM, NAME, VALUE)      \
 167   do                                                    \
 168     {                                                   \
 169       ASM_WEAKEN_LABEL (STREAM, NAME);                  \
 170       if (VALUE)                                        \
 171         ASM_OUTPUT_DEF (STREAM, NAME, VALUE);           \
 172     }                                                   \
 173   while (0)
 174 #endif
 175 #endif
 176
 177 /* How to emit a .type directive.  */
 178 #ifndef ASM_OUTPUT_TYPE_DIRECTIVE
 179 #if defined TYPE_ASM_OP && defined TYPE_OPERAND_FMT
 180 #define ASM_OUTPUT_TYPE_DIRECTIVE(STREAM, NAME, TYPE)   \
 181   do                                                    \
 182     {                                                   \
 183       fputs (TYPE_ASM_OP, STREAM);                      \
 184       assemble_name (STREAM, NAME);                     \
 185       fputs (", ", STREAM);                             \
 186       fprintf (STREAM, TYPE_OPERAND_FMT, TYPE);         \
 187       putc ('\n', STREAM);                              \
 188     }                                                   \
 189   while (0)
 190 #endif
 191 #endif
 192
 193 /* How to emit a .size directive.  */
 194 #ifndef ASM_OUTPUT_SIZE_DIRECTIVE
 195 #ifdef SIZE_ASM_OP
 196 #define ASM_OUTPUT_SIZE_DIRECTIVE(STREAM, NAME, SIZE)   \
 197   do                                                    \
 198     {                                                   \
 199       HOST_WIDE_INT size_ = (SIZE);                     \
 200       fputs (SIZE_ASM_OP, STREAM);                      \
 201       assemble_name (STREAM, NAME);                     \
 202       fprintf (STREAM, ", " HOST_WIDE_INT_PRINT_DEC "\n", size_); \
 203     }                                                   \
 204   while (0)
 205
 206 #define ASM_OUTPUT_MEASURED_SIZE(STREAM, NAME)          \
 207   do                                                    \
 208     {                                                   \
 209       fputs (SIZE_ASM_OP, STREAM);                      \
 210       assemble_name (STREAM, NAME);                     \
 211       fputs (", .-", STREAM);                           \
 212       assemble_name (STREAM, NAME);                     \
 213       putc ('\n', STREAM);                              \
 214     }                                                   \
 215   while (0)
 216
 217 #endif
 218 #endif
 219
 220 /* This determines whether or not we support weak symbols.  */
 221 #ifndef SUPPORTS_WEAK
 222 #if defined (ASM_WEAKEN_LABEL) || defined (ASM_WEAKEN_DECL)
 223 #define SUPPORTS_WEAK 1
 224 #else
 225 #define SUPPORTS_WEAK 0
 226 #endif
 227 #endif
 228
 229 /* This determines whether or not we support link-once semantics.  */
 230 #ifndef SUPPORTS_ONE_ONLY
 231 #ifdef MAKE_DECL_ONE_ONLY
 232 #define SUPPORTS_ONE_ONLY 1
 233 #else
 234 #define SUPPORTS_ONE_ONLY 0
 235 #endif
 236 #endif
 237
 238 /* This determines whether weak symbols must be left out of a static
 239    archive's table of contents.  Defining this macro to be nonzero has
 240    the consequence that certain symbols will not be made weak that
 241    otherwise would be.  The C++ ABI requires this macro to be zero;
 242    see the documentation.  */
 243 #ifndef TARGET_WEAK_NOT_IN_ARCHIVE_TOC
 244 #define TARGET_WEAK_NOT_IN_ARCHIVE_TOC 0
 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 /* By default we can assume that all global symbols are in one namespace,
 291    across all shared libraries.  */
 292 #ifndef MULTIPLE_SYMBOL_SPACES
 293 # define MULTIPLE_SYMBOL_SPACES 0
 294 #endif
 295
 296 /* If the target supports init_priority C++ attribute, give
 297    SUPPORTS_INIT_PRIORITY a nonzero value.  */
 298 #ifndef SUPPORTS_INIT_PRIORITY
 299 #define SUPPORTS_INIT_PRIORITY 1
 300 #endif /* SUPPORTS_INIT_PRIORITY */
 301
 302 /* If duplicate library search directories can be removed from a
 303    linker command without changing the linker's semantics, give this
 304    symbol a nonzero.  */
 305 #ifndef LINK_ELIMINATE_DUPLICATE_LDIRECTORIES
 306 #define LINK_ELIMINATE_DUPLICATE_LDIRECTORIES 0
 307 #endif /* LINK_ELIMINATE_DUPLICATE_LDIRECTORIES */
 308
 309 /* If we have a definition of INCOMING_RETURN_ADDR_RTX, assume that
 310    the rest of the DWARF 2 frame unwind support is also provided.  */
 311 #if !defined (DWARF2_UNWIND_INFO) && defined (INCOMING_RETURN_ADDR_RTX)
 312 #define DWARF2_UNWIND_INFO 1
 313 #endif
 314
 315 /* If we have named sections, and we're using crtstuff to run ctors,
 316    use them for registering eh frame information.  */
 317 #if defined (TARGET_ASM_NAMED_SECTION) && DWARF2_UNWIND_INFO \
 318     && !defined(EH_FRAME_IN_DATA_SECTION)
 319 #ifndef EH_FRAME_SECTION_NAME
 320 #define EH_FRAME_SECTION_NAME ".eh_frame"
 321 #endif
 322 #endif
 323
 324 /* If we have named section and we support weak symbols, then use the
 325    .jcr section for recording java classes which need to be registered
 326    at program start-up time.  */
 327 #if defined (TARGET_ASM_NAMED_SECTION) && SUPPORTS_WEAK
 328 #ifndef JCR_SECTION_NAME
 329 #define JCR_SECTION_NAME ".jcr"
 330 #endif
 331 #endif
 332
 333 /* Number of hardware registers that go into the DWARF-2 unwind info.
 334    If not defined, equals FIRST_PSEUDO_REGISTER  */
 335
 336 #ifndef DWARF_FRAME_REGISTERS
 337 #define DWARF_FRAME_REGISTERS FIRST_PSEUDO_REGISTER
 338 #endif
 339
 340 /* How to renumber registers for dbx and gdb.  If not defined, assume
 341    no renumbering is necessary.  */
 342
 343 #ifndef DBX_REGISTER_NUMBER
 344 #define DBX_REGISTER_NUMBER(REGNO) (REGNO)
 345 #endif
 346
 347 /* Default sizes for base C types.  If the sizes are different for
 348    your target, you should override these values by defining the
 349    appropriate symbols in your tm.h file.  */
 350
 351 #ifndef BITS_PER_UNIT
 352 #define BITS_PER_UNIT 8
 353 #endif
 354
 355 #ifndef BITS_PER_WORD
 356 #define BITS_PER_WORD (BITS_PER_UNIT * UNITS_PER_WORD)
 357 #endif
 358
 359 #ifndef CHAR_TYPE_SIZE
 360 #define CHAR_TYPE_SIZE BITS_PER_UNIT
 361 #endif
 362
 363 #ifndef BOOL_TYPE_SIZE
 364 /* `bool' has size and alignment `1', on almost all platforms.  */
 365 #define BOOL_TYPE_SIZE CHAR_TYPE_SIZE
 366 #endif
 367
 368 #ifndef SHORT_TYPE_SIZE
 369 #define SHORT_TYPE_SIZE (BITS_PER_UNIT * MIN ((UNITS_PER_WORD + 1) / 2, 2))
 370 #endif
 371
 372 #ifndef INT_TYPE_SIZE
 373 #define INT_TYPE_SIZE BITS_PER_WORD
 374 #endif
 375
 376 #ifndef LONG_TYPE_SIZE
 377 #define LONG_TYPE_SIZE BITS_PER_WORD
 378 #endif
 379
 380 #ifndef LONG_LONG_TYPE_SIZE
 381 #define LONG_LONG_TYPE_SIZE (BITS_PER_WORD * 2)
 382 #endif
 383
 384 #ifndef WCHAR_TYPE_SIZE
 385 #define WCHAR_TYPE_SIZE INT_TYPE_SIZE
 386 #endif
 387
 388 #ifndef FLOAT_TYPE_SIZE
 389 #define FLOAT_TYPE_SIZE BITS_PER_WORD
 390 #endif
 391
 392 #ifndef DOUBLE_TYPE_SIZE
 393 #define DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
 394 #endif
 395
 396 #ifndef LONG_DOUBLE_TYPE_SIZE
 397 #define LONG_DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
 398 #endif
 399
 400 /* Width in bits of a pointer.  Mind the value of the macro `Pmode'.  */
 401 #ifndef POINTER_SIZE
 402 #define POINTER_SIZE BITS_PER_WORD
 403 #endif
 404
 405 #ifndef PIC_OFFSET_TABLE_REGNUM
 406 #define PIC_OFFSET_TABLE_REGNUM INVALID_REGNUM
 407 #endif
 408
 409 #ifndef TARGET_DLLIMPORT_DECL_ATTRIBUTES
 410 #define TARGET_DLLIMPORT_DECL_ATTRIBUTES 0
 411 #endif
 412
 413 #ifndef TARGET_DECLSPEC
 414 #if TARGET_DLLIMPORT_DECL_ATTRIBUTES
 415 /* If the target supports the "dllimport" attribute, users are
 416    probably used to the "__declspec" syntax.  */
 417 #define TARGET_DECLSPEC 1
 418 #else
 419 #define TARGET_DECLSPEC 0
 420 #endif
 421 #endif
 422
 423 /* By default, the preprocessor should be invoked the same way in C++
 424    as in C.  */
 425 #ifndef CPLUSPLUS_CPP_SPEC
 426 #ifdef CPP_SPEC
 427 #define CPLUSPLUS_CPP_SPEC CPP_SPEC
 428 #endif
 429 #endif
 430
 431 #ifndef ACCUMULATE_OUTGOING_ARGS
 432 #define ACCUMULATE_OUTGOING_ARGS 0
 433 #endif
 434
 435 /* Supply a default definition for PUSH_ARGS.  */
 436 #ifndef PUSH_ARGS
 437 #ifdef PUSH_ROUNDING
 438 #define PUSH_ARGS       !ACCUMULATE_OUTGOING_ARGS
 439 #else
 440 #define PUSH_ARGS       0
 441 #endif
 442 #endif
 443
 444 /* Decide whether a function's arguments should be processed
 445    from first to last or from last to first.
 446
 447    They should if the stack and args grow in opposite directions, but
 448    only if we have push insns.  */
 449
 450 #ifdef PUSH_ROUNDING
 451
 452 #ifndef PUSH_ARGS_REVERSED
 453 #if defined (STACK_GROWS_DOWNWARD) != defined (ARGS_GROW_DOWNWARD)
 454 #define PUSH_ARGS_REVERSED  PUSH_ARGS
 455 #endif
 456 #endif
 457
 458 #endif
 459
 460 #ifndef PUSH_ARGS_REVERSED
 461 #define PUSH_ARGS_REVERSED 0
 462 #endif
 463
 464 /* If PREFERRED_STACK_BOUNDARY is not defined, set it to STACK_BOUNDARY.
 465    STACK_BOUNDARY is required.  */
 466 #ifndef PREFERRED_STACK_BOUNDARY
 467 #define PREFERRED_STACK_BOUNDARY STACK_BOUNDARY
 468 #endif
 469
 470 #ifndef TARGET_DEFAULT_PACK_STRUCT
 471 #define TARGET_DEFAULT_PACK_STRUCT 0
 472 #endif
 473
 474 /* By default, the C++ compiler will use function addresses in the
 475    vtable entries.  Setting this nonzero tells the compiler to use
 476    function descriptors instead.  The value of this macro says how
 477    many words wide the descriptor is (normally 2).  It is assumed
 478    that the address of a function descriptor may be treated as a
 479    pointer to a function.  */
 480 #ifndef TARGET_VTABLE_USES_DESCRIPTORS
 481 #define TARGET_VTABLE_USES_DESCRIPTORS 0
 482 #endif
 483
 484 /* By default, the vtable entries are void pointers, the so the alignment
 485    is the same as pointer alignment.  The value of this macro specifies
 486    the alignment of the vtable entry in bits.  It should be defined only
 487    when special alignment is necessary.  */
 488 #ifndef TARGET_VTABLE_ENTRY_ALIGN
 489 #define TARGET_VTABLE_ENTRY_ALIGN POINTER_SIZE
 490 #endif
 491
 492 /* There are a few non-descriptor entries in the vtable at offsets below
 493    zero.  If these entries must be padded (say, to preserve the alignment
 494    specified by TARGET_VTABLE_ENTRY_ALIGN), set this to the number of
 495    words in each data entry.  */
 496 #ifndef TARGET_VTABLE_DATA_ENTRY_DISTANCE
 497 #define TARGET_VTABLE_DATA_ENTRY_DISTANCE 1
 498 #endif
 499
 500 /* Decide whether it is safe to use a local alias for a virtual function
 501    when constructing thunks.  */
 502 #ifndef TARGET_USE_LOCAL_THUNK_ALIAS_P
 503 #ifdef ASM_OUTPUT_DEF
 504 #define TARGET_USE_LOCAL_THUNK_ALIAS_P(DECL) 1
 505 #else
 506 #define TARGET_USE_LOCAL_THUNK_ALIAS_P(DECL) 0
 507 #endif
 508 #endif
 509
 510 /* Select a format to encode pointers in exception handling data.  We
 511    prefer those that result in fewer dynamic relocations.  Assume no
 512    special support here and encode direct references.  */
 513 #ifndef ASM_PREFERRED_EH_DATA_FORMAT
 514 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE,GLOBAL)  DW_EH_PE_absptr
 515 #endif
 516
 517 /* By default, the C++ compiler will use the lowest bit of the pointer
 518    to function to indicate a pointer-to-member-function points to a
 519    virtual member function.  However, if FUNCTION_BOUNDARY indicates
 520    function addresses aren't always even, the lowest bit of the delta
 521    field will be used.  */
 522 #ifndef TARGET_PTRMEMFUNC_VBIT_LOCATION
 523 #define TARGET_PTRMEMFUNC_VBIT_LOCATION \
 524   (FUNCTION_BOUNDARY >= 2 * BITS_PER_UNIT \
 525    ? ptrmemfunc_vbit_in_pfn : ptrmemfunc_vbit_in_delta)
 526 #endif
 527
 528 #ifndef DEFAULT_GDB_EXTENSIONS
 529 #define DEFAULT_GDB_EXTENSIONS 1
 530 #endif
 531
 532 /* If more than one debugging type is supported, you must define
 533    PREFERRED_DEBUGGING_TYPE to choose the default.  */
 534
 535 #if 1 < (defined (DBX_DEBUGGING_INFO) + defined (SDB_DEBUGGING_INFO) \
 536          + defined (DWARF2_DEBUGGING_INFO) + defined (XCOFF_DEBUGGING_INFO) \
 537          + defined (VMS_DEBUGGING_INFO))
 538 #ifndef PREFERRED_DEBUGGING_TYPE
 539 #error You must define PREFERRED_DEBUGGING_TYPE
 540 #endif /* no PREFERRED_DEBUGGING_TYPE */
 541
 542 /* If only one debugging format is supported, define PREFERRED_DEBUGGING_TYPE
 543    here so other code needn't care.  */
 544 #elif defined DBX_DEBUGGING_INFO
 545 #define PREFERRED_DEBUGGING_TYPE DBX_DEBUG
 546
 547 #elif defined SDB_DEBUGGING_INFO
 548 #define PREFERRED_DEBUGGING_TYPE SDB_DEBUG
 549
 550 #elif defined DWARF2_DEBUGGING_INFO
 551 #define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
 552
 553 #elif defined VMS_DEBUGGING_INFO
 554 #define PREFERRED_DEBUGGING_TYPE VMS_AND_DWARF2_DEBUG
 555
 556 #elif defined XCOFF_DEBUGGING_INFO
 557 #define PREFERRED_DEBUGGING_TYPE XCOFF_DEBUG
 558
 559 #else
 560 /* No debugging format is supported by this target.  */
 561 #define PREFERRED_DEBUGGING_TYPE NO_DEBUG
 562 #endif
 563
 564 /* Define codes for all the float formats that we know of.  */
 565 #define UNKNOWN_FLOAT_FORMAT 0
 566 #define IEEE_FLOAT_FORMAT 1
 567 #define VAX_FLOAT_FORMAT 2
 568 #define IBM_FLOAT_FORMAT 3
 569 #define C4X_FLOAT_FORMAT 4
 570
 571 /* Default to IEEE float if not specified.  Nearly all machines use it.  */
 572 #ifndef TARGET_FLOAT_FORMAT
 573 #define TARGET_FLOAT_FORMAT     IEEE_FLOAT_FORMAT
 574 #endif
 575
 576 /* Some macros can be defined by the backend in either a mode-dependent
 577    or mode-independent form.  The compiler proper should only use the
 578    mode-dependent form, providing VOIDmode when the mode is unknown.
 579    We can't poison the macros because the backend may reference them.  */
 580
 581 #ifndef REGNO_MODE_OK_FOR_BASE_P
 582 #define REGNO_MODE_OK_FOR_BASE_P(REGNO, MODE) REGNO_OK_FOR_BASE_P (REGNO)
 583 #endif
 584
 585 #ifndef REG_MODE_OK_FOR_BASE_P
 586 #define REG_MODE_OK_FOR_BASE_P(REG, MODE) REG_OK_FOR_BASE_P (REG)
 587 #endif
 588
 589 /* Determine the register class for registers suitable to be the base
 590    address register in a MEM.  Allow the choice to be dependent upon
 591    the mode of the memory access.  */
 592 #ifndef MODE_BASE_REG_CLASS
 593 #define MODE_BASE_REG_CLASS(MODE) BASE_REG_CLASS
 594 #endif
 595
 596 /* Some machines require a different base register class if the index
 597    is a register.  By default, assume that a base register is acceptable.  */
 598 #ifndef MODE_BASE_REG_REG_CLASS
 599 #define MODE_BASE_REG_REG_CLASS(MODE) MODE_BASE_REG_CLASS(MODE)
 600 #endif
 601
 602 #ifndef REGNO_MODE_OK_FOR_REG_BASE_P
 603 #define REGNO_MODE_OK_FOR_REG_BASE_P(REGNO, MODE) REGNO_MODE_OK_FOR_BASE_P (REGNO, MODE)
 604 #endif
 605
 606 #ifndef REG_MODE_OK_FOR_REG_BASE_P
 607 #define REG_MODE_OK_FOR_REG_BASE_P(REGNO, MODE) REG_MODE_OK_FOR_BASE_P (REGNO, MODE)
 608 #endif
 609
 610 #ifndef LARGEST_EXPONENT_IS_NORMAL
 611 #define LARGEST_EXPONENT_IS_NORMAL(SIZE) 0
 612 #endif
 613
 614 #ifndef ROUND_TOWARDS_ZERO
 615 #define ROUND_TOWARDS_ZERO 0
 616 #endif
 617
 618 #ifndef MODE_HAS_NANS
 619 #define MODE_HAS_NANS(MODE)                                     \
 620   (FLOAT_MODE_P (MODE)                                          \
 621    && TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT                  \
 622    && !LARGEST_EXPONENT_IS_NORMAL (GET_MODE_BITSIZE (MODE)))
 623 #endif
 624
 625 #ifndef MODE_HAS_INFINITIES
 626 #define MODE_HAS_INFINITIES(MODE)                               \
 627   (FLOAT_MODE_P (MODE)                                          \
 628    && TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT                  \
 629    && !LARGEST_EXPONENT_IS_NORMAL (GET_MODE_BITSIZE (MODE)))
 630 #endif
 631
 632 #ifndef MODE_HAS_SIGNED_ZEROS
 633 #define MODE_HAS_SIGNED_ZEROS(MODE) \
 634   (FLOAT_MODE_P (MODE) && TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT)
 635 #endif
 636
 637 #ifndef MODE_HAS_SIGN_DEPENDENT_ROUNDING
 638 #define MODE_HAS_SIGN_DEPENDENT_ROUNDING(MODE)                  \
 639   (FLOAT_MODE_P (MODE)                                          \
 640    && TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT                  \
 641    && !ROUND_TOWARDS_ZERO)
 642 #endif
 643
 644 #ifndef FLOAT_LIB_COMPARE_RETURNS_BOOL
 645 #define FLOAT_LIB_COMPARE_RETURNS_BOOL(MODE, COMPARISON) false
 646 #endif
 647
 648 /* True if the targets integer-comparison functions return { 0, 1, 2
 649    } to indicate { <, ==, > }.  False if { -1, 0, 1 } is used
 650    instead.  The libgcc routines are biased.  */
 651 #ifndef TARGET_LIB_INT_CMP_BIASED
 652 #define TARGET_LIB_INT_CMP_BIASED (true)
 653 #endif
 654
 655 /* If FLOAT_WORDS_BIG_ENDIAN is not defined in the header files,
 656    then the word-endianness is the same as for integers.  */
 657 #ifndef FLOAT_WORDS_BIG_ENDIAN
 658 #define FLOAT_WORDS_BIG_ENDIAN WORDS_BIG_ENDIAN
 659 #endif
 660
 661 #ifndef TARGET_FLT_EVAL_METHOD
 662 #define TARGET_FLT_EVAL_METHOD 0
 663 #endif
 664
 665 #ifndef HOT_TEXT_SECTION_NAME
 666 #define HOT_TEXT_SECTION_NAME ".text.hot"
 667 #endif
 668
 669 #ifndef UNLIKELY_EXECUTED_TEXT_SECTION_NAME
 670 #define UNLIKELY_EXECUTED_TEXT_SECTION_NAME ".text.unlikely"
 671 #endif
 672
 673 #ifndef HAS_LONG_COND_BRANCH
 674 #define HAS_LONG_COND_BRANCH 0
 675 #endif
 676
 677 #ifndef HAS_LONG_UNCOND_BRANCH
 678 #define HAS_LONG_UNCOND_BRANCH 0
 679 #endif
 680
 681 #ifndef UNITS_PER_SIMD_WORD
 682 #define UNITS_PER_SIMD_WORD 0
 683 #endif
 684
 685 /* Determine whether __cxa_atexit, rather than atexit, is used to
 686    register C++ destructors for local statics and global objects.  */
 687 #ifndef DEFAULT_USE_CXA_ATEXIT
 688 #define DEFAULT_USE_CXA_ATEXIT 0
 689 #endif
 690
 691 /* Determine whether extra constraint letter should be handled
 692    via address reload (like 'o').  */
 693 #ifndef EXTRA_MEMORY_CONSTRAINT
 694 #define EXTRA_MEMORY_CONSTRAINT(C,STR) 0
 695 #endif
 696
 697 /* Determine whether extra constraint letter should be handled
 698    as an address (like 'p').  */
 699 #ifndef EXTRA_ADDRESS_CONSTRAINT
 700 #define EXTRA_ADDRESS_CONSTRAINT(C,STR) 0
 701 #endif
 702
 703 /* When a port defines CONSTRAINT_LEN, it should use DEFAULT_CONSTRAINT_LEN
 704    for all the characters that it does not want to change, so things like the
 705   'length' of a digit in a matching constraint is an implementation detail,
 706    and not part of the interface.  */
 707 #define DEFAULT_CONSTRAINT_LEN(C,STR) 1
 708
 709 #ifndef CONSTRAINT_LEN
 710 #define CONSTRAINT_LEN(C,STR) DEFAULT_CONSTRAINT_LEN (C, STR)
 711 #endif
 712
 713 #if defined (CONST_OK_FOR_LETTER_P) && ! defined (CONST_OK_FOR_CONSTRAINT_P)
 714 #define CONST_OK_FOR_CONSTRAINT_P(VAL,C,STR) CONST_OK_FOR_LETTER_P (VAL, C)
 715 #endif
 716
 717 #if defined (CONST_DOUBLE_OK_FOR_LETTER_P) && ! defined (CONST_DOUBLE_OK_FOR_CONSTRAINT_P)
 718 #define CONST_DOUBLE_OK_FOR_CONSTRAINT_P(OP,C,STR) \
 719   CONST_DOUBLE_OK_FOR_LETTER_P (OP, C)
 720 #endif
 721
 722 #ifndef REG_CLASS_FROM_CONSTRAINT
 723 #define REG_CLASS_FROM_CONSTRAINT(C,STR) REG_CLASS_FROM_LETTER (C)
 724 #endif
 725
 726 #if defined (EXTRA_CONSTRAINT) && ! defined (EXTRA_CONSTRAINT_STR)
 727 #define EXTRA_CONSTRAINT_STR(OP, C,STR) EXTRA_CONSTRAINT (OP, C)
 728 #endif
 729
 730 #ifndef REGISTER_MOVE_COST
 731 #define REGISTER_MOVE_COST(m, x, y) 2
 732 #endif
 733
 734 /* Determine whether the the entire c99 runtime
 735    is present in the runtime library.  */
 736 #ifndef TARGET_C99_FUNCTIONS
 737 #define TARGET_C99_FUNCTIONS 0
 738 #endif
 739
 740 /* Indicate that CLZ and CTZ are undefined at zero.  */
 741 #ifndef CLZ_DEFINED_VALUE_AT_ZERO
 742 #define CLZ_DEFINED_VALUE_AT_ZERO(MODE, VALUE)  0
 743 #endif
 744 #ifndef CTZ_DEFINED_VALUE_AT_ZERO
 745 #define CTZ_DEFINED_VALUE_AT_ZERO(MODE, VALUE)  0
 746 #endif
 747
 748 /* Provide a default value for STORE_FLAG_VALUE.  */
 749 #ifndef STORE_FLAG_VALUE
 750 #define STORE_FLAG_VALUE  1
 751 #endif
 752
 753 /* This macro is used to determine what the largest unit size that
 754    move_by_pieces can use is.  */
 755
 756 /* MOVE_MAX_PIECES is the number of bytes at a time which we can
 757    move efficiently, as opposed to  MOVE_MAX which is the maximum
 758    number of bytes we can move with a single instruction.  */
 759
 760 #ifndef MOVE_MAX_PIECES
 761 #define MOVE_MAX_PIECES   MOVE_MAX
 762 #endif
 763
 764 #ifndef STACK_POINTER_OFFSET
 765 #define STACK_POINTER_OFFSET    0
 766 #endif
 767
 768 #ifndef LOCAL_REGNO
 769 #define LOCAL_REGNO(REGNO)  0
 770 #endif
 771
 772 /* EXIT_IGNORE_STACK should be nonzero if, when returning from a function,
 773    the stack pointer does not matter.  The value is tested only in
 774    functions that have frame pointers.  */
 775 #ifndef EXIT_IGNORE_STACK
 776 #define EXIT_IGNORE_STACK 0
 777 #endif
 778
 779 /* Assume that case vectors are not pc-relative.  */
 780 #ifndef CASE_VECTOR_PC_RELATIVE
 781 #define CASE_VECTOR_PC_RELATIVE 0
 782 #endif
 783
 784 /* Assume that trampolines need function alignment.  */
 785 #ifndef TRAMPOLINE_ALIGNMENT
 786 #define TRAMPOLINE_ALIGNMENT FUNCTION_BOUNDARY
 787 #endif
 788
 789 /* Register mappings for target machines without register windows.  */
 790 #ifndef INCOMING_REGNO
 791 #define INCOMING_REGNO(N) (N)
 792 #endif
 793
 794 #ifndef OUTGOING_REGNO
 795 #define OUTGOING_REGNO(N) (N)
 796 #endif
 797
 798 #ifndef SHIFT_COUNT_TRUNCATED
 799 #define SHIFT_COUNT_TRUNCATED 0
 800 #endif
 801
 802 #ifndef LEGITIMIZE_ADDRESS
 803 #define LEGITIMIZE_ADDRESS(X, OLDX, MODE, WIN)
 804 #endif
 805
 806 #ifndef LEGITIMATE_PIC_OPERAND_P
 807 #define LEGITIMATE_PIC_OPERAND_P(X) 1
 808 #endif
 809
 810 #ifndef REVERSIBLE_CC_MODE
 811 #define REVERSIBLE_CC_MODE(MODE) 0
 812 #endif
 813
 814 /* Biggest alignment supported by the object file format of this machine.  */
 815 #ifndef MAX_OFILE_ALIGNMENT
 816 #define MAX_OFILE_ALIGNMENT BIGGEST_ALIGNMENT
 817 #endif
 818
 819 #endif  /* ! GCC_DEFAULTS_H */