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    2005
   4    Free Software Foundation, Inc.
   5    Contributed by Ron Guilmette (rfg@monkeys.com)
   6
   7 This file is part of GCC.
   8
   9 GCC is free software; you can redistribute it and/or modify it under
  10 the terms of the GNU General Public License as published by the Free
  11 Software Foundation; either version 2, or (at your option) any later
  12 version.
  13
  14 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  15 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  16 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  17 for more details.
  18
  19 You should have received a copy of the GNU General Public License
  20 along with GCC; see the file COPYING.  If not, write to the Free
  21 Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
  22 02110-1301, USA.  */
  23
  24 #ifndef GCC_DEFAULTS_H
  25 #define GCC_DEFAULTS_H
  26
  27 #ifndef GET_ENVIRONMENT
  28 #define GET_ENVIRONMENT(VALUE, NAME) do { (VALUE) = getenv (NAME); } while (0)
  29 #endif
  30
  31 #define obstack_chunk_alloc     ((void *(*) (long)) xmalloc)
  32 #define obstack_chunk_free      ((void (*) (void *)) free)
  33 #define OBSTACK_CHUNK_SIZE      0
  34 #define gcc_obstack_init(OBSTACK)                       \
  35   _obstack_begin ((OBSTACK), OBSTACK_CHUNK_SIZE, 0,     \
  36                   obstack_chunk_alloc,                  \
  37                   obstack_chunk_free)
  38
  39 /* Store in OUTPUT a string (made with alloca) containing an
  40    assembler-name for a local static variable or function named NAME.
  41    LABELNO is an integer which is different for each call.  */
  42
  43 #ifndef ASM_PN_FORMAT
  44 # ifndef NO_DOT_IN_LABEL
  45 #  define ASM_PN_FORMAT "%s.%lu"
  46 # else
  47 #  ifndef NO_DOLLAR_IN_LABEL
  48 #   define ASM_PN_FORMAT "%s$%lu"
  49 #  else
  50 #   define ASM_PN_FORMAT "__%s_%lu"
  51 #  endif
  52 # endif
  53 #endif /* ! ASM_PN_FORMAT */
  54
  55 #ifndef ASM_FORMAT_PRIVATE_NAME
  56 # define ASM_FORMAT_PRIVATE_NAME(OUTPUT, NAME, LABELNO) \
  57   do { const char *const name_ = (NAME); \
  58        char *const output_ = (OUTPUT) = \
  59          (char *) alloca (strlen (name_) + 32); \
  60        sprintf (output_, ASM_PN_FORMAT, name_, (unsigned long)(LABELNO)); \
  61   } while (0)
  62 #endif
  63
  64 /* Choose a reasonable default for ASM_OUTPUT_ASCII.  */
  65
  66 #ifndef ASM_OUTPUT_ASCII
  67 #define ASM_OUTPUT_ASCII(MYFILE, MYSTRING, MYLENGTH) \
  68   do {                                                                        \
  69     FILE *_hide_asm_out_file = (MYFILE);                                      \
  70     const unsigned char *_hide_p = (const unsigned char *) (MYSTRING);        \
  71     int _hide_thissize = (MYLENGTH);                                          \
  72     {                                                                         \
  73       FILE *asm_out_file = _hide_asm_out_file;                                \
  74       const unsigned char *p = _hide_p;                                       \
  75       int thissize = _hide_thissize;                                          \
  76       int i;                                                                  \
  77       fprintf (asm_out_file, "\t.ascii \"");                                  \
  78                                                                               \
  79       for (i = 0; i < thissize; i++)                                          \
  80         {                                                                     \
  81           int c = p[i];                                                       \
  82           if (c == '\"' || c == '\\')                                         \
  83             putc ('\\', asm_out_file);                                        \
  84           if (ISPRINT(c))                                                     \
  85             putc (c, asm_out_file);                                           \
  86           else                                                                \
  87             {                                                                 \
  88               fprintf (asm_out_file, "\\%o", c);                              \
  89               /* After an octal-escape, if a digit follows,                   \
  90                  terminate one string constant and start another.             \
  91                  The VAX assembler fails to stop reading the escape           \
  92                  after three digits, so this is the only way we               \
  93                  can get it to parse the data properly.  */                   \
  94               if (i < thissize - 1 && ISDIGIT(p[i + 1]))                      \
  95                 fprintf (asm_out_file, "\"\n\t.ascii \"");                    \
  96           }                                                                   \
  97         }                                                                     \
  98       fprintf (asm_out_file, "\"\n");                                         \
  99     }                                                                         \
 100   }                                                                           \
 101   while (0)
 102 #endif
 103
 104 /* This is how we tell the assembler to equate two values.  */
 105 #ifdef SET_ASM_OP
 106 #ifndef ASM_OUTPUT_DEF
 107 #define ASM_OUTPUT_DEF(FILE,LABEL1,LABEL2)                              \
 108  do {   fprintf ((FILE), "%s", SET_ASM_OP);                             \
 109         assemble_name (FILE, LABEL1);                                   \
 110         fprintf (FILE, ",");                                            \
 111         assemble_name (FILE, LABEL2);                                   \
 112         fprintf (FILE, "\n");                                           \
 113   } while (0)
 114 #endif
 115 #endif
 116
 117 /* Decide whether to defer emitting the assembler output for an equate
 118    of two values.  The default is to not defer output.  */
 119 #ifndef TARGET_DEFERRED_OUTPUT_DEFS
 120 #define TARGET_DEFERRED_OUTPUT_DEFS(DECL,TARGET) false
 121 #endif
 122
 123 /* This is how to output the definition of a user-level label named
 124    NAME, such as the label on a static function or variable NAME.  */
 125
 126 #ifndef ASM_OUTPUT_LABEL
 127 #define ASM_OUTPUT_LABEL(FILE,NAME) \
 128   do { assemble_name ((FILE), (NAME)); fputs (":\n", (FILE)); } while (0)
 129 #endif
 130
 131 /* Output the definition of a compiler-generated label named NAME.  */
 132 #ifndef ASM_OUTPUT_INTERNAL_LABEL
 133 #define ASM_OUTPUT_INTERNAL_LABEL(FILE,NAME)    \
 134   do {                                          \
 135     assemble_name_raw ((FILE), (NAME));         \
 136     fputs (":\n", (FILE));                      \
 137   } while (0)
 138 #endif
 139
 140 /* This is how to output a reference to a user-level label named NAME.  */
 141
 142 #ifndef ASM_OUTPUT_LABELREF
 143 #define ASM_OUTPUT_LABELREF(FILE,NAME)  asm_fprintf ((FILE), "%U%s", (NAME))
 144 #endif
 145
 146 /* Allow target to print debug info labels specially.  This is useful for
 147    VLIW targets, since debug info labels should go into the middle of
 148    instruction bundles instead of breaking them.  */
 149
 150 #ifndef ASM_OUTPUT_DEBUG_LABEL
 151 #define ASM_OUTPUT_DEBUG_LABEL(FILE, PREFIX, NUM) \
 152   (*targetm.asm_out.internal_label) (FILE, PREFIX, NUM)
 153 #endif
 154
 155 /* This is how we tell the assembler that a symbol is weak.  */
 156 #ifndef ASM_OUTPUT_WEAK_ALIAS
 157 #if defined (ASM_WEAKEN_LABEL) && defined (ASM_OUTPUT_DEF)
 158 #define ASM_OUTPUT_WEAK_ALIAS(STREAM, NAME, VALUE)      \
 159   do                                                    \
 160     {                                                   \
 161       ASM_WEAKEN_LABEL (STREAM, NAME);                  \
 162       if (VALUE)                                        \
 163         ASM_OUTPUT_DEF (STREAM, NAME, VALUE);           \
 164     }                                                   \
 165   while (0)
 166 #endif
 167 #endif
 168
 169 /* This is how we tell the assembler that a symbol is a weak alias to
 170    another symbol that doesn't require the other symbol to be defined.
 171    Uses of the former will turn into weak uses of the latter, i.e.,
 172    uses that, in case the latter is undefined, will not cause errors,
 173    and will add it to the symbol table as weak undefined.  However, if
 174    the latter is referenced directly, a strong reference prevails.  */
 175 #ifndef ASM_OUTPUT_WEAKREF
 176 #if defined HAVE_GAS_WEAKREF
 177 #define ASM_OUTPUT_WEAKREF(FILE, DECL, NAME, VALUE)                     \
 178   do                                                                    \
 179     {                                                                   \
 180       fprintf ((FILE), "\t.weakref\t");                                 \
 181       assemble_name ((FILE), (NAME));                                   \
 182       fprintf ((FILE), ",");                                            \
 183       assemble_name ((FILE), (VALUE));                                  \
 184       fprintf ((FILE), "\n");                                           \
 185     }                                                                   \
 186   while (0)
 187 #endif
 188 #endif
 189
 190 /* How to emit a .type directive.  */
 191 #ifndef ASM_OUTPUT_TYPE_DIRECTIVE
 192 #if defined TYPE_ASM_OP && defined TYPE_OPERAND_FMT
 193 #define ASM_OUTPUT_TYPE_DIRECTIVE(STREAM, NAME, TYPE)   \
 194   do                                                    \
 195     {                                                   \
 196       fputs (TYPE_ASM_OP, STREAM);                      \
 197       assemble_name (STREAM, NAME);                     \
 198       fputs (", ", STREAM);                             \
 199       fprintf (STREAM, TYPE_OPERAND_FMT, TYPE);         \
 200       putc ('\n', STREAM);                              \
 201     }                                                   \
 202   while (0)
 203 #endif
 204 #endif
 205
 206 /* How to emit a .size directive.  */
 207 #ifndef ASM_OUTPUT_SIZE_DIRECTIVE
 208 #ifdef SIZE_ASM_OP
 209 #define ASM_OUTPUT_SIZE_DIRECTIVE(STREAM, NAME, SIZE)   \
 210   do                                                    \
 211     {                                                   \
 212       HOST_WIDE_INT size_ = (SIZE);                     \
 213       fputs (SIZE_ASM_OP, STREAM);                      \
 214       assemble_name (STREAM, NAME);                     \
 215       fprintf (STREAM, ", " HOST_WIDE_INT_PRINT_DEC "\n", size_); \
 216     }                                                   \
 217   while (0)
 218
 219 #define ASM_OUTPUT_MEASURED_SIZE(STREAM, NAME)          \
 220   do                                                    \
 221     {                                                   \
 222       fputs (SIZE_ASM_OP, STREAM);                      \
 223       assemble_name (STREAM, NAME);                     \
 224       fputs (", .-", STREAM);                           \
 225       assemble_name (STREAM, NAME);                     \
 226       putc ('\n', STREAM);                              \
 227     }                                                   \
 228   while (0)
 229
 230 #endif
 231 #endif
 232
 233 /* This determines whether or not we support weak symbols.  */
 234 #ifndef SUPPORTS_WEAK
 235 #if defined (ASM_WEAKEN_LABEL) || defined (ASM_WEAKEN_DECL)
 236 #define SUPPORTS_WEAK 1
 237 #else
 238 #define SUPPORTS_WEAK 0
 239 #endif
 240 #endif
 241
 242 /* This determines whether or not we support link-once semantics.  */
 243 #ifndef SUPPORTS_ONE_ONLY
 244 #ifdef MAKE_DECL_ONE_ONLY
 245 #define SUPPORTS_ONE_ONLY 1
 246 #else
 247 #define SUPPORTS_ONE_ONLY 0
 248 #endif
 249 #endif
 250
 251 /* This determines whether weak symbols must be left out of a static
 252    archive's table of contents.  Defining this macro to be nonzero has
 253    the consequence that certain symbols will not be made weak that
 254    otherwise would be.  The C++ ABI requires this macro to be zero;
 255    see the documentation.  */
 256 #ifndef TARGET_WEAK_NOT_IN_ARCHIVE_TOC
 257 #define TARGET_WEAK_NOT_IN_ARCHIVE_TOC 0
 258 #endif
 259
 260 /* This determines whether or not we need linkonce unwind information.  */
 261 #ifndef TARGET_USES_WEAK_UNWIND_INFO
 262 #define TARGET_USES_WEAK_UNWIND_INFO 0
 263 #endif
 264
 265 /* By default, there is no prefix on user-defined symbols.  */
 266 #ifndef USER_LABEL_PREFIX
 267 #define USER_LABEL_PREFIX ""
 268 #endif
 269
 270 /* If the target supports weak symbols, define TARGET_ATTRIBUTE_WEAK to
 271    provide a weak attribute.  Else define it to nothing.
 272
 273    This would normally belong in ansidecl.h, but SUPPORTS_WEAK is
 274    not available at that time.
 275
 276    Note, this is only for use by target files which we know are to be
 277    compiled by GCC.  */
 278 #ifndef TARGET_ATTRIBUTE_WEAK
 279 # if SUPPORTS_WEAK
 280 #  define TARGET_ATTRIBUTE_WEAK __attribute__ ((weak))
 281 # else
 282 #  define TARGET_ATTRIBUTE_WEAK
 283 # endif
 284 #endif
 285
 286 /* Determines whether we may use common symbols to represent one-only
 287    semantics (a.k.a. "vague linkage").  */
 288 #ifndef USE_COMMON_FOR_ONE_ONLY
 289 # define USE_COMMON_FOR_ONE_ONLY 1
 290 #endif
 291
 292 /* By default we can assume that all global symbols are in one namespace,
 293    across all shared libraries.  */
 294 #ifndef MULTIPLE_SYMBOL_SPACES
 295 # define MULTIPLE_SYMBOL_SPACES 0
 296 #endif
 297
 298 /* If the target supports init_priority C++ attribute, give
 299    SUPPORTS_INIT_PRIORITY a nonzero value.  */
 300 #ifndef SUPPORTS_INIT_PRIORITY
 301 #define SUPPORTS_INIT_PRIORITY 1
 302 #endif /* SUPPORTS_INIT_PRIORITY */
 303
 304 /* If duplicate library search directories can be removed from a
 305    linker command without changing the linker's semantics, give this
 306    symbol a nonzero.  */
 307 #ifndef LINK_ELIMINATE_DUPLICATE_LDIRECTORIES
 308 #define LINK_ELIMINATE_DUPLICATE_LDIRECTORIES 0
 309 #endif /* LINK_ELIMINATE_DUPLICATE_LDIRECTORIES */
 310
 311 /* If we have a definition of INCOMING_RETURN_ADDR_RTX, assume that
 312    the rest of the DWARF 2 frame unwind support is also provided.  */
 313 #if !defined (DWARF2_UNWIND_INFO) && defined (INCOMING_RETURN_ADDR_RTX)
 314 #define DWARF2_UNWIND_INFO 1
 315 #endif
 316
 317 /* If we have named sections, and we're using crtstuff to run ctors,
 318    use them for registering eh frame information.  */
 319 #if defined (TARGET_ASM_NAMED_SECTION) && DWARF2_UNWIND_INFO \
 320     && !defined(EH_FRAME_IN_DATA_SECTION)
 321 #ifndef EH_FRAME_SECTION_NAME
 322 #define EH_FRAME_SECTION_NAME ".eh_frame"
 323 #endif
 324 #endif
 325
 326 /* On many systems, different EH table encodings are used under
 327    difference circumstances.  Some will require runtime relocations;
 328    some will not.  For those that do not require runtime relocations,
 329    we would like to make the table read-only.  However, since the
 330    read-only tables may need to be combined with read-write tables
 331    that do require runtime relocation, it is not safe to make the
 332    tables read-only unless the linker will merge read-only and
 333    read-write sections into a single read-write section.  If your
 334    linker does not have this ability, but your system is such that no
 335    encoding used with non-PIC code will ever require a runtime
 336    relocation, then you can define EH_TABLES_CAN_BE_READ_ONLY to 1 in
 337    your target configuration file.  */
 338 #ifndef EH_TABLES_CAN_BE_READ_ONLY
 339 #ifdef HAVE_LD_RO_RW_SECTION_MIXING
 340 #define EH_TABLES_CAN_BE_READ_ONLY 1
 341 #else
 342 #define EH_TABLES_CAN_BE_READ_ONLY 0
 343 #endif
 344 #endif
 345
 346 /* If we have named section and we support weak symbols, then use the
 347    .jcr section for recording java classes which need to be registered
 348    at program start-up time.  */
 349 #if defined (TARGET_ASM_NAMED_SECTION) && SUPPORTS_WEAK
 350 #ifndef JCR_SECTION_NAME
 351 #define JCR_SECTION_NAME ".jcr"
 352 #endif
 353 #endif
 354
 355 /* This decision to use a .jcr section can be overridden by defining
 356    USE_JCR_SECTION to 0 in target file.  This is necessary if target
 357    can define JCR_SECTION_NAME but does not have crtstuff or
 358    linker support for .jcr section.  */
 359 #ifndef TARGET_USE_JCR_SECTION
 360 #ifdef JCR_SECTION_NAME
 361 #define TARGET_USE_JCR_SECTION 1
 362 #else
 363 #define TARGET_USE_JCR_SECTION 0
 364 #endif
 365 #endif
 366
 367 /* Number of hardware registers that go into the DWARF-2 unwind info.
 368    If not defined, equals FIRST_PSEUDO_REGISTER  */
 369
 370 #ifndef DWARF_FRAME_REGISTERS
 371 #define DWARF_FRAME_REGISTERS FIRST_PSEUDO_REGISTER
 372 #endif
 373
 374 /* How to renumber registers for dbx and gdb.  If not defined, assume
 375    no renumbering is necessary.  */
 376
 377 #ifndef DBX_REGISTER_NUMBER
 378 #define DBX_REGISTER_NUMBER(REGNO) (REGNO)
 379 #endif
 380
 381 /* Default sizes for base C types.  If the sizes are different for
 382    your target, you should override these values by defining the
 383    appropriate symbols in your tm.h file.  */
 384
 385 #ifndef BITS_PER_UNIT
 386 #define BITS_PER_UNIT 8
 387 #endif
 388
 389 #ifndef BITS_PER_WORD
 390 #define BITS_PER_WORD (BITS_PER_UNIT * UNITS_PER_WORD)
 391 #endif
 392
 393 #ifndef CHAR_TYPE_SIZE
 394 #define CHAR_TYPE_SIZE BITS_PER_UNIT
 395 #endif
 396
 397 #ifndef BOOL_TYPE_SIZE
 398 /* `bool' has size and alignment `1', on almost all platforms.  */
 399 #define BOOL_TYPE_SIZE CHAR_TYPE_SIZE
 400 #endif
 401
 402 #ifndef SHORT_TYPE_SIZE
 403 #define SHORT_TYPE_SIZE (BITS_PER_UNIT * MIN ((UNITS_PER_WORD + 1) / 2, 2))
 404 #endif
 405
 406 #ifndef INT_TYPE_SIZE
 407 #define INT_TYPE_SIZE BITS_PER_WORD
 408 #endif
 409
 410 #ifndef LONG_TYPE_SIZE
 411 #define LONG_TYPE_SIZE BITS_PER_WORD
 412 #endif
 413
 414 #ifndef LONG_LONG_TYPE_SIZE
 415 #define LONG_LONG_TYPE_SIZE (BITS_PER_WORD * 2)
 416 #endif
 417
 418 #ifndef WCHAR_TYPE_SIZE
 419 #define WCHAR_TYPE_SIZE INT_TYPE_SIZE
 420 #endif
 421
 422 #ifndef FLOAT_TYPE_SIZE
 423 #define FLOAT_TYPE_SIZE BITS_PER_WORD
 424 #endif
 425
 426 #ifndef DOUBLE_TYPE_SIZE
 427 #define DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
 428 #endif
 429
 430 #ifndef LONG_DOUBLE_TYPE_SIZE
 431 #define LONG_DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
 432 #endif
 433
 434 #ifndef DECIMAL32_TYPE_SIZE
 435 #define DECIMAL32_TYPE_SIZE 32
 436 #endif
 437
 438 #ifndef DECIMAL64_TYPE_SIZE
 439 #define DECIMAL64_TYPE_SIZE 64
 440 #endif
 441
 442 #ifndef DECIMAL128_TYPE_SIZE
 443 #define DECIMAL128_TYPE_SIZE 128
 444 #endif
 445
 446 /* Width in bits of a pointer.  Mind the value of the macro `Pmode'.  */
 447 #ifndef POINTER_SIZE
 448 #define POINTER_SIZE BITS_PER_WORD
 449 #endif
 450
 451 #ifndef PIC_OFFSET_TABLE_REGNUM
 452 #define PIC_OFFSET_TABLE_REGNUM INVALID_REGNUM
 453 #endif
 454
 455 #ifndef TARGET_DLLIMPORT_DECL_ATTRIBUTES
 456 #define TARGET_DLLIMPORT_DECL_ATTRIBUTES 0
 457 #endif
 458
 459 #ifndef TARGET_DECLSPEC
 460 #if TARGET_DLLIMPORT_DECL_ATTRIBUTES
 461 /* If the target supports the "dllimport" attribute, users are
 462    probably used to the "__declspec" syntax.  */
 463 #define TARGET_DECLSPEC 1
 464 #else
 465 #define TARGET_DECLSPEC 0
 466 #endif
 467 #endif
 468
 469 /* By default, the preprocessor should be invoked the same way in C++
 470    as in C.  */
 471 #ifndef CPLUSPLUS_CPP_SPEC
 472 #ifdef CPP_SPEC
 473 #define CPLUSPLUS_CPP_SPEC CPP_SPEC
 474 #endif
 475 #endif
 476
 477 #ifndef ACCUMULATE_OUTGOING_ARGS
 478 #define ACCUMULATE_OUTGOING_ARGS 0
 479 #endif
 480
 481 /* Supply a default definition for PUSH_ARGS.  */
 482 #ifndef PUSH_ARGS
 483 #ifdef PUSH_ROUNDING
 484 #define PUSH_ARGS       !ACCUMULATE_OUTGOING_ARGS
 485 #else
 486 #define PUSH_ARGS       0
 487 #endif
 488 #endif
 489
 490 /* Decide whether a function's arguments should be processed
 491    from first to last or from last to first.
 492
 493    They should if the stack and args grow in opposite directions, but
 494    only if we have push insns.  */
 495
 496 #ifdef PUSH_ROUNDING
 497
 498 #ifndef PUSH_ARGS_REVERSED
 499 #if defined (STACK_GROWS_DOWNWARD) != defined (ARGS_GROW_DOWNWARD)
 500 #define PUSH_ARGS_REVERSED  PUSH_ARGS
 501 #endif
 502 #endif
 503
 504 #endif
 505
 506 #ifndef PUSH_ARGS_REVERSED
 507 #define PUSH_ARGS_REVERSED 0
 508 #endif
 509
 510 /* If PREFERRED_STACK_BOUNDARY is not defined, set it to STACK_BOUNDARY.
 511    STACK_BOUNDARY is required.  */
 512 #ifndef PREFERRED_STACK_BOUNDARY
 513 #define PREFERRED_STACK_BOUNDARY STACK_BOUNDARY
 514 #endif
 515
 516 #ifndef TARGET_DEFAULT_PACK_STRUCT
 517 #define TARGET_DEFAULT_PACK_STRUCT 0
 518 #endif
 519
 520 /* By default, the C++ compiler will use function addresses in the
 521    vtable entries.  Setting this nonzero tells the compiler to use
 522    function descriptors instead.  The value of this macro says how
 523    many words wide the descriptor is (normally 2).  It is assumed
 524    that the address of a function descriptor may be treated as a
 525    pointer to a function.  */
 526 #ifndef TARGET_VTABLE_USES_DESCRIPTORS
 527 #define TARGET_VTABLE_USES_DESCRIPTORS 0
 528 #endif
 529
 530 /* By default, the vtable entries are void pointers, the so the alignment
 531    is the same as pointer alignment.  The value of this macro specifies
 532    the alignment of the vtable entry in bits.  It should be defined only
 533    when special alignment is necessary.  */
 534 #ifndef TARGET_VTABLE_ENTRY_ALIGN
 535 #define TARGET_VTABLE_ENTRY_ALIGN POINTER_SIZE
 536 #endif
 537
 538 /* There are a few non-descriptor entries in the vtable at offsets below
 539    zero.  If these entries must be padded (say, to preserve the alignment
 540    specified by TARGET_VTABLE_ENTRY_ALIGN), set this to the number of
 541    words in each data entry.  */
 542 #ifndef TARGET_VTABLE_DATA_ENTRY_DISTANCE
 543 #define TARGET_VTABLE_DATA_ENTRY_DISTANCE 1
 544 #endif
 545
 546 /* Decide whether it is safe to use a local alias for a virtual function
 547    when constructing thunks.  */
 548 #ifndef TARGET_USE_LOCAL_THUNK_ALIAS_P
 549 #ifdef ASM_OUTPUT_DEF
 550 #define TARGET_USE_LOCAL_THUNK_ALIAS_P(DECL) 1
 551 #else
 552 #define TARGET_USE_LOCAL_THUNK_ALIAS_P(DECL) 0
 553 #endif
 554 #endif
 555
 556 /* Select a format to encode pointers in exception handling data.  We
 557    prefer those that result in fewer dynamic relocations.  Assume no
 558    special support here and encode direct references.  */
 559 #ifndef ASM_PREFERRED_EH_DATA_FORMAT
 560 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE,GLOBAL)  DW_EH_PE_absptr
 561 #endif
 562
 563 /* By default, the C++ compiler will use the lowest bit of the pointer
 564    to function to indicate a pointer-to-member-function points to a
 565    virtual member function.  However, if FUNCTION_BOUNDARY indicates
 566    function addresses aren't always even, the lowest bit of the delta
 567    field will be used.  */
 568 #ifndef TARGET_PTRMEMFUNC_VBIT_LOCATION
 569 #define TARGET_PTRMEMFUNC_VBIT_LOCATION \
 570   (FUNCTION_BOUNDARY >= 2 * BITS_PER_UNIT \
 571    ? ptrmemfunc_vbit_in_pfn : ptrmemfunc_vbit_in_delta)
 572 #endif
 573
 574 #ifndef DEFAULT_GDB_EXTENSIONS
 575 #define DEFAULT_GDB_EXTENSIONS 1
 576 #endif
 577
 578 /* If more than one debugging type is supported, you must define
 579    PREFERRED_DEBUGGING_TYPE to choose the default.  */
 580
 581 #if 1 < (defined (DBX_DEBUGGING_INFO) + defined (SDB_DEBUGGING_INFO) \
 582          + defined (DWARF2_DEBUGGING_INFO) + defined (XCOFF_DEBUGGING_INFO) \
 583          + defined (VMS_DEBUGGING_INFO))
 584 #ifndef PREFERRED_DEBUGGING_TYPE
 585 #error You must define PREFERRED_DEBUGGING_TYPE
 586 #endif /* no PREFERRED_DEBUGGING_TYPE */
 587
 588 /* If only one debugging format is supported, define PREFERRED_DEBUGGING_TYPE
 589    here so other code needn't care.  */
 590 #elif defined DBX_DEBUGGING_INFO
 591 #define PREFERRED_DEBUGGING_TYPE DBX_DEBUG
 592
 593 #elif defined SDB_DEBUGGING_INFO
 594 #define PREFERRED_DEBUGGING_TYPE SDB_DEBUG
 595
 596 #elif defined DWARF2_DEBUGGING_INFO
 597 #define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
 598
 599 #elif defined VMS_DEBUGGING_INFO
 600 #define PREFERRED_DEBUGGING_TYPE VMS_AND_DWARF2_DEBUG
 601
 602 #elif defined XCOFF_DEBUGGING_INFO
 603 #define PREFERRED_DEBUGGING_TYPE XCOFF_DEBUG
 604
 605 #else
 606 /* No debugging format is supported by this target.  */
 607 #define PREFERRED_DEBUGGING_TYPE NO_DEBUG
 608 #endif
 609
 610 /* Define codes for all the float formats that we know of.  */
 611 #define UNKNOWN_FLOAT_FORMAT 0
 612 #define IEEE_FLOAT_FORMAT 1
 613 #define VAX_FLOAT_FORMAT 2
 614 #define IBM_FLOAT_FORMAT 3
 615 #define C4X_FLOAT_FORMAT 4
 616
 617 /* Default to IEEE float if not specified.  Nearly all machines use it.  */
 618 #ifndef TARGET_FLOAT_FORMAT
 619 #define TARGET_FLOAT_FORMAT     IEEE_FLOAT_FORMAT
 620 #endif
 621
 622 /* Some macros can be defined by the backend in either a mode-dependent
 623    or mode-independent form.  The compiler proper should only use the
 624    mode-dependent form, providing VOIDmode when the mode is unknown.
 625    We can't poison the macros because the backend may reference them.  */
 626
 627 #ifndef REGNO_MODE_OK_FOR_BASE_P
 628 #define REGNO_MODE_OK_FOR_BASE_P(REGNO, MODE) REGNO_OK_FOR_BASE_P (REGNO)
 629 #endif
 630
 631 #ifndef REG_MODE_OK_FOR_BASE_P
 632 #define REG_MODE_OK_FOR_BASE_P(REG, MODE) REG_OK_FOR_BASE_P (REG)
 633 #endif
 634
 635 /* Determine the register class for registers suitable to be the base
 636    address register in a MEM.  Allow the choice to be dependent upon
 637    the mode of the memory access.  */
 638 #ifndef MODE_BASE_REG_CLASS
 639 #define MODE_BASE_REG_CLASS(MODE) BASE_REG_CLASS
 640 #endif
 641
 642 /* Some machines require a different base register class if the index
 643    is a register.  By default, assume that a base register is acceptable.  */
 644 #ifndef MODE_BASE_REG_REG_CLASS
 645 #define MODE_BASE_REG_REG_CLASS(MODE) MODE_BASE_REG_CLASS(MODE)
 646 #endif
 647
 648 #ifndef REGNO_MODE_OK_FOR_REG_BASE_P
 649 #define REGNO_MODE_OK_FOR_REG_BASE_P(REGNO, MODE) REGNO_MODE_OK_FOR_BASE_P (REGNO, MODE)
 650 #endif
 651
 652 #ifndef REG_MODE_OK_FOR_REG_BASE_P
 653 #define REG_MODE_OK_FOR_REG_BASE_P(REGNO, MODE) REG_MODE_OK_FOR_BASE_P (REGNO, MODE)
 654 #endif
 655
 656 #ifndef LARGEST_EXPONENT_IS_NORMAL
 657 #define LARGEST_EXPONENT_IS_NORMAL(SIZE) 0
 658 #endif
 659
 660 #ifndef ROUND_TOWARDS_ZERO
 661 #define ROUND_TOWARDS_ZERO 0
 662 #endif
 663
 664 #ifndef MODE_HAS_NANS
 665 #define MODE_HAS_NANS(MODE)                                     \
 666   (FLOAT_MODE_P (MODE)                                          \
 667    && TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT                  \
 668    && !LARGEST_EXPONENT_IS_NORMAL (GET_MODE_BITSIZE (MODE)))
 669 #endif
 670
 671 #ifndef MODE_HAS_INFINITIES
 672 #define MODE_HAS_INFINITIES(MODE)                               \
 673   (FLOAT_MODE_P (MODE)                                          \
 674    && TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT                  \
 675    && !LARGEST_EXPONENT_IS_NORMAL (GET_MODE_BITSIZE (MODE)))
 676 #endif
 677
 678 #ifndef MODE_HAS_SIGNED_ZEROS
 679 #define MODE_HAS_SIGNED_ZEROS(MODE) \
 680   (FLOAT_MODE_P (MODE) && TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT)
 681 #endif
 682
 683 #ifndef MODE_HAS_SIGN_DEPENDENT_ROUNDING
 684 #define MODE_HAS_SIGN_DEPENDENT_ROUNDING(MODE)                  \
 685   (FLOAT_MODE_P (MODE)                                          \
 686    && TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT                  \
 687    && !ROUND_TOWARDS_ZERO)
 688 #endif
 689
 690 #ifndef FLOAT_LIB_COMPARE_RETURNS_BOOL
 691 #define FLOAT_LIB_COMPARE_RETURNS_BOOL(MODE, COMPARISON) false
 692 #endif
 693
 694 /* True if the targets integer-comparison functions return { 0, 1, 2
 695    } to indicate { <, ==, > }.  False if { -1, 0, 1 } is used
 696    instead.  The libgcc routines are biased.  */
 697 #ifndef TARGET_LIB_INT_CMP_BIASED
 698 #define TARGET_LIB_INT_CMP_BIASED (true)
 699 #endif
 700
 701 /* If FLOAT_WORDS_BIG_ENDIAN is not defined in the header files,
 702    then the word-endianness is the same as for integers.  */
 703 #ifndef FLOAT_WORDS_BIG_ENDIAN
 704 #define FLOAT_WORDS_BIG_ENDIAN WORDS_BIG_ENDIAN
 705 #endif
 706
 707 #ifndef TARGET_FLT_EVAL_METHOD
 708 #define TARGET_FLT_EVAL_METHOD 0
 709 #endif
 710
 711 #ifndef TARGET_DEC_EVAL_METHOD
 712 #define TARGET_DEC_EVAL_METHOD 2
 713 #endif
 714
 715 #ifndef HOT_TEXT_SECTION_NAME
 716 #define HOT_TEXT_SECTION_NAME ".text.hot"
 717 #endif
 718
 719 #ifndef UNLIKELY_EXECUTED_TEXT_SECTION_NAME
 720 #define UNLIKELY_EXECUTED_TEXT_SECTION_NAME ".text.unlikely"
 721 #endif
 722
 723 #ifndef HAS_LONG_COND_BRANCH
 724 #define HAS_LONG_COND_BRANCH 0
 725 #endif
 726
 727 #ifndef HAS_LONG_UNCOND_BRANCH
 728 #define HAS_LONG_UNCOND_BRANCH 0
 729 #endif
 730
 731 /* By default, only attempt to parallelize bitwise operations, and
 732    possibly adds/subtracts using bit-twiddling.  */
 733 #ifndef UNITS_PER_SIMD_WORD
 734 #define UNITS_PER_SIMD_WORD UNITS_PER_WORD
 735 #endif
 736
 737 /* Determine whether __cxa_atexit, rather than atexit, is used to
 738    register C++ destructors for local statics and global objects.  */
 739 #ifndef DEFAULT_USE_CXA_ATEXIT
 740 #define DEFAULT_USE_CXA_ATEXIT 0
 741 #endif
 742
 743 /* Determine whether extra constraint letter should be handled
 744    via address reload (like 'o').  */
 745 #ifndef EXTRA_MEMORY_CONSTRAINT
 746 #define EXTRA_MEMORY_CONSTRAINT(C,STR) 0
 747 #endif
 748
 749 /* Determine whether extra constraint letter should be handled
 750    as an address (like 'p').  */
 751 #ifndef EXTRA_ADDRESS_CONSTRAINT
 752 #define EXTRA_ADDRESS_CONSTRAINT(C,STR) 0
 753 #endif
 754
 755 /* When a port defines CONSTRAINT_LEN, it should use DEFAULT_CONSTRAINT_LEN
 756    for all the characters that it does not want to change, so things like the
 757   'length' of a digit in a matching constraint is an implementation detail,
 758    and not part of the interface.  */
 759 #define DEFAULT_CONSTRAINT_LEN(C,STR) 1
 760
 761 #ifndef CONSTRAINT_LEN
 762 #define CONSTRAINT_LEN(C,STR) DEFAULT_CONSTRAINT_LEN (C, STR)
 763 #endif
 764
 765 #if defined (CONST_OK_FOR_LETTER_P) && ! defined (CONST_OK_FOR_CONSTRAINT_P)
 766 #define CONST_OK_FOR_CONSTRAINT_P(VAL,C,STR) CONST_OK_FOR_LETTER_P (VAL, C)
 767 #endif
 768
 769 #if defined (CONST_DOUBLE_OK_FOR_LETTER_P) && ! defined (CONST_DOUBLE_OK_FOR_CONSTRAINT_P)
 770 #define CONST_DOUBLE_OK_FOR_CONSTRAINT_P(OP,C,STR) \
 771   CONST_DOUBLE_OK_FOR_LETTER_P (OP, C)
 772 #endif
 773
 774 #ifndef REG_CLASS_FROM_CONSTRAINT
 775 #define REG_CLASS_FROM_CONSTRAINT(C,STR) REG_CLASS_FROM_LETTER (C)
 776 #endif
 777
 778 #if defined (EXTRA_CONSTRAINT) && ! defined (EXTRA_CONSTRAINT_STR)
 779 #define EXTRA_CONSTRAINT_STR(OP, C,STR) EXTRA_CONSTRAINT (OP, C)
 780 #endif
 781
 782 #ifndef REGISTER_MOVE_COST
 783 #define REGISTER_MOVE_COST(m, x, y) 2
 784 #endif
 785
 786 /* Determine whether the entire c99 runtime
 787    is present in the runtime library.  */
 788 #ifndef TARGET_C99_FUNCTIONS
 789 #define TARGET_C99_FUNCTIONS 0
 790 #endif
 791
 792 /* Indicate that CLZ and CTZ are undefined at zero.  */
 793 #ifndef CLZ_DEFINED_VALUE_AT_ZERO
 794 #define CLZ_DEFINED_VALUE_AT_ZERO(MODE, VALUE)  0
 795 #endif
 796 #ifndef CTZ_DEFINED_VALUE_AT_ZERO
 797 #define CTZ_DEFINED_VALUE_AT_ZERO(MODE, VALUE)  0
 798 #endif
 799
 800 /* Provide a default value for STORE_FLAG_VALUE.  */
 801 #ifndef STORE_FLAG_VALUE
 802 #define STORE_FLAG_VALUE  1
 803 #endif
 804
 805 /* This macro is used to determine what the largest unit size that
 806    move_by_pieces can use is.  */
 807
 808 /* MOVE_MAX_PIECES is the number of bytes at a time which we can
 809    move efficiently, as opposed to  MOVE_MAX which is the maximum
 810    number of bytes we can move with a single instruction.  */
 811
 812 #ifndef MOVE_MAX_PIECES
 813 #define MOVE_MAX_PIECES   MOVE_MAX
 814 #endif
 815
 816 #ifndef STACK_POINTER_OFFSET
 817 #define STACK_POINTER_OFFSET    0
 818 #endif
 819
 820 #ifndef LOCAL_REGNO
 821 #define LOCAL_REGNO(REGNO)  0
 822 #endif
 823
 824 /* EXIT_IGNORE_STACK should be nonzero if, when returning from a function,
 825    the stack pointer does not matter.  The value is tested only in
 826    functions that have frame pointers.  */
 827 #ifndef EXIT_IGNORE_STACK
 828 #define EXIT_IGNORE_STACK 0
 829 #endif
 830
 831 /* Assume that case vectors are not pc-relative.  */
 832 #ifndef CASE_VECTOR_PC_RELATIVE
 833 #define CASE_VECTOR_PC_RELATIVE 0
 834 #endif
 835
 836 /* Assume that trampolines need function alignment.  */
 837 #ifndef TRAMPOLINE_ALIGNMENT
 838 #define TRAMPOLINE_ALIGNMENT FUNCTION_BOUNDARY
 839 #endif
 840
 841 /* Register mappings for target machines without register windows.  */
 842 #ifndef INCOMING_REGNO
 843 #define INCOMING_REGNO(N) (N)
 844 #endif
 845
 846 #ifndef OUTGOING_REGNO
 847 #define OUTGOING_REGNO(N) (N)
 848 #endif
 849
 850 #ifndef SHIFT_COUNT_TRUNCATED
 851 #define SHIFT_COUNT_TRUNCATED 0
 852 #endif
 853
 854 #ifndef LEGITIMIZE_ADDRESS
 855 #define LEGITIMIZE_ADDRESS(X, OLDX, MODE, WIN)
 856 #endif
 857
 858 #ifndef LEGITIMATE_PIC_OPERAND_P
 859 #define LEGITIMATE_PIC_OPERAND_P(X) 1
 860 #endif
 861
 862 #ifndef REVERSIBLE_CC_MODE
 863 #define REVERSIBLE_CC_MODE(MODE) 0
 864 #endif
 865
 866 /* Biggest alignment supported by the object file format of this machine.  */
 867 #ifndef MAX_OFILE_ALIGNMENT
 868 #define MAX_OFILE_ALIGNMENT BIGGEST_ALIGNMENT
 869 #endif
 870
 871 #ifndef FRAME_GROWS_DOWNWARD
 872 #define FRAME_GROWS_DOWNWARD 0
 873 #endif
 874
 875 /* On most machines, the CFA coincides with the first incoming parm.  */
 876 #ifndef ARG_POINTER_CFA_OFFSET
 877 #define ARG_POINTER_CFA_OFFSET(FNDECL) FIRST_PARM_OFFSET (FNDECL)
 878 #endif
 879
 880 /* The offset from the incoming value of %sp to the top of the stack frame
 881    for the current function.  */
 882 #ifndef INCOMING_FRAME_SP_OFFSET
 883 #define INCOMING_FRAME_SP_OFFSET 0
 884 #endif
 885
 886 #endif  /* ! GCC_DEFAULTS_H */