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 #if defined (HAVE_AS_TLS) && !defined (ASM_OUTPUT_TLS_COMMON)
 118 #define ASM_OUTPUT_TLS_COMMON(FILE, DECL, NAME, SIZE)                   \
 119   do                                                                    \
 120     {                                                                   \
 121       fprintf ((FILE), "\t.tls_common\t");                              \
 122       assemble_name ((FILE), (NAME));                                   \
 123       fprintf ((FILE), ","HOST_WIDE_INT_PRINT_UNSIGNED",%u\n",          \
 124                (SIZE), DECL_ALIGN (DECL) / BITS_PER_UNIT);              \
 125     }                                                                   \
 126   while (0)
 127 #endif
 128
 129 /* Decide whether to defer emitting the assembler output for an equate
 130    of two values.  The default is to not defer output.  */
 131 #ifndef TARGET_DEFERRED_OUTPUT_DEFS
 132 #define TARGET_DEFERRED_OUTPUT_DEFS(DECL,TARGET) false
 133 #endif
 134
 135 /* This is how to output the definition of a user-level label named
 136    NAME, such as the label on a static function or variable NAME.  */
 137
 138 #ifndef ASM_OUTPUT_LABEL
 139 #define ASM_OUTPUT_LABEL(FILE,NAME) \
 140   do { assemble_name ((FILE), (NAME)); fputs (":\n", (FILE)); } while (0)
 141 #endif
 142
 143 /* Output the definition of a compiler-generated label named NAME.  */
 144 #ifndef ASM_OUTPUT_INTERNAL_LABEL
 145 #define ASM_OUTPUT_INTERNAL_LABEL(FILE,NAME)    \
 146   do {                                          \
 147     assemble_name_raw ((FILE), (NAME));         \
 148     fputs (":\n", (FILE));                      \
 149   } while (0)
 150 #endif
 151
 152 /* This is how to output a reference to a user-level label named NAME.  */
 153
 154 #ifndef ASM_OUTPUT_LABELREF
 155 #define ASM_OUTPUT_LABELREF(FILE,NAME)  asm_fprintf ((FILE), "%U%s", (NAME))
 156 #endif
 157
 158 /* Allow target to print debug info labels specially.  This is useful for
 159    VLIW targets, since debug info labels should go into the middle of
 160    instruction bundles instead of breaking them.  */
 161
 162 #ifndef ASM_OUTPUT_DEBUG_LABEL
 163 #define ASM_OUTPUT_DEBUG_LABEL(FILE, PREFIX, NUM) \
 164   (*targetm.asm_out.internal_label) (FILE, PREFIX, NUM)
 165 #endif
 166
 167 /* This is how we tell the assembler that a symbol is weak.  */
 168 #ifndef ASM_OUTPUT_WEAK_ALIAS
 169 #if defined (ASM_WEAKEN_LABEL) && defined (ASM_OUTPUT_DEF)
 170 #define ASM_OUTPUT_WEAK_ALIAS(STREAM, NAME, VALUE)      \
 171   do                                                    \
 172     {                                                   \
 173       ASM_WEAKEN_LABEL (STREAM, NAME);                  \
 174       if (VALUE)                                        \
 175         ASM_OUTPUT_DEF (STREAM, NAME, VALUE);           \
 176     }                                                   \
 177   while (0)
 178 #endif
 179 #endif
 180
 181 /* This is how we tell the assembler that a symbol is a weak alias to
 182    another symbol that doesn't require the other symbol to be defined.
 183    Uses of the former will turn into weak uses of the latter, i.e.,
 184    uses that, in case the latter is undefined, will not cause errors,
 185    and will add it to the symbol table as weak undefined.  However, if
 186    the latter is referenced directly, a strong reference prevails.  */
 187 #ifndef ASM_OUTPUT_WEAKREF
 188 #if defined HAVE_GAS_WEAKREF
 189 #define ASM_OUTPUT_WEAKREF(FILE, DECL, NAME, VALUE)                     \
 190   do                                                                    \
 191     {                                                                   \
 192       fprintf ((FILE), "\t.weakref\t");                                 \
 193       assemble_name ((FILE), (NAME));                                   \
 194       fprintf ((FILE), ",");                                            \
 195       assemble_name ((FILE), (VALUE));                                  \
 196       fprintf ((FILE), "\n");                                           \
 197     }                                                                   \
 198   while (0)
 199 #endif
 200 #endif
 201
 202 /* How to emit a .type directive.  */
 203 #ifndef ASM_OUTPUT_TYPE_DIRECTIVE
 204 #if defined TYPE_ASM_OP && defined TYPE_OPERAND_FMT
 205 #define ASM_OUTPUT_TYPE_DIRECTIVE(STREAM, NAME, TYPE)   \
 206   do                                                    \
 207     {                                                   \
 208       fputs (TYPE_ASM_OP, STREAM);                      \
 209       assemble_name (STREAM, NAME);                     \
 210       fputs (", ", STREAM);                             \
 211       fprintf (STREAM, TYPE_OPERAND_FMT, TYPE);         \
 212       putc ('\n', STREAM);                              \
 213     }                                                   \
 214   while (0)
 215 #endif
 216 #endif
 217
 218 /* How to emit a .size directive.  */
 219 #ifndef ASM_OUTPUT_SIZE_DIRECTIVE
 220 #ifdef SIZE_ASM_OP
 221 #define ASM_OUTPUT_SIZE_DIRECTIVE(STREAM, NAME, SIZE)   \
 222   do                                                    \
 223     {                                                   \
 224       HOST_WIDE_INT size_ = (SIZE);                     \
 225       fputs (SIZE_ASM_OP, STREAM);                      \
 226       assemble_name (STREAM, NAME);                     \
 227       fprintf (STREAM, ", " HOST_WIDE_INT_PRINT_DEC "\n", size_); \
 228     }                                                   \
 229   while (0)
 230
 231 #define ASM_OUTPUT_MEASURED_SIZE(STREAM, NAME)          \
 232   do                                                    \
 233     {                                                   \
 234       fputs (SIZE_ASM_OP, STREAM);                      \
 235       assemble_name (STREAM, NAME);                     \
 236       fputs (", .-", STREAM);                           \
 237       assemble_name (STREAM, NAME);                     \
 238       putc ('\n', STREAM);                              \
 239     }                                                   \
 240   while (0)
 241
 242 #endif
 243 #endif
 244
 245 /* This determines whether or not we support weak symbols.  */
 246 #ifndef SUPPORTS_WEAK
 247 #if defined (ASM_WEAKEN_LABEL) || defined (ASM_WEAKEN_DECL)
 248 #define SUPPORTS_WEAK 1
 249 #else
 250 #define SUPPORTS_WEAK 0
 251 #endif
 252 #endif
 253
 254 /* This determines whether or not we support link-once semantics.  */
 255 #ifndef SUPPORTS_ONE_ONLY
 256 #ifdef MAKE_DECL_ONE_ONLY
 257 #define SUPPORTS_ONE_ONLY 1
 258 #else
 259 #define SUPPORTS_ONE_ONLY 0
 260 #endif
 261 #endif
 262
 263 /* This determines whether weak symbols must be left out of a static
 264    archive's table of contents.  Defining this macro to be nonzero has
 265    the consequence that certain symbols will not be made weak that
 266    otherwise would be.  The C++ ABI requires this macro to be zero;
 267    see the documentation.  */
 268 #ifndef TARGET_WEAK_NOT_IN_ARCHIVE_TOC
 269 #define TARGET_WEAK_NOT_IN_ARCHIVE_TOC 0
 270 #endif
 271
 272 /* This determines whether or not we need linkonce unwind information.  */
 273 #ifndef TARGET_USES_WEAK_UNWIND_INFO
 274 #define TARGET_USES_WEAK_UNWIND_INFO 0
 275 #endif
 276
 277 /* By default, there is no prefix on user-defined symbols.  */
 278 #ifndef USER_LABEL_PREFIX
 279 #define USER_LABEL_PREFIX ""
 280 #endif
 281
 282 /* If the target supports weak symbols, define TARGET_ATTRIBUTE_WEAK to
 283    provide a weak attribute.  Else define it to nothing.
 284
 285    This would normally belong in ansidecl.h, but SUPPORTS_WEAK is
 286    not available at that time.
 287
 288    Note, this is only for use by target files which we know are to be
 289    compiled by GCC.  */
 290 #ifndef TARGET_ATTRIBUTE_WEAK
 291 # if SUPPORTS_WEAK
 292 #  define TARGET_ATTRIBUTE_WEAK __attribute__ ((weak))
 293 # else
 294 #  define TARGET_ATTRIBUTE_WEAK
 295 # endif
 296 #endif
 297
 298 /* Determines whether we may use common symbols to represent one-only
 299    semantics (a.k.a. "vague linkage").  */
 300 #ifndef USE_COMMON_FOR_ONE_ONLY
 301 # define USE_COMMON_FOR_ONE_ONLY 1
 302 #endif
 303
 304 /* By default we can assume that all global symbols are in one namespace,
 305    across all shared libraries.  */
 306 #ifndef MULTIPLE_SYMBOL_SPACES
 307 # define MULTIPLE_SYMBOL_SPACES 0
 308 #endif
 309
 310 /* If the target supports init_priority C++ attribute, give
 311    SUPPORTS_INIT_PRIORITY a nonzero value.  */
 312 #ifndef SUPPORTS_INIT_PRIORITY
 313 #define SUPPORTS_INIT_PRIORITY 1
 314 #endif /* SUPPORTS_INIT_PRIORITY */
 315
 316 /* If duplicate library search directories can be removed from a
 317    linker command without changing the linker's semantics, give this
 318    symbol a nonzero.  */
 319 #ifndef LINK_ELIMINATE_DUPLICATE_LDIRECTORIES
 320 #define LINK_ELIMINATE_DUPLICATE_LDIRECTORIES 0
 321 #endif /* LINK_ELIMINATE_DUPLICATE_LDIRECTORIES */
 322
 323 /* If we have a definition of INCOMING_RETURN_ADDR_RTX, assume that
 324    the rest of the DWARF 2 frame unwind support is also provided.  */
 325 #if !defined (DWARF2_UNWIND_INFO) && defined (INCOMING_RETURN_ADDR_RTX)
 326 #define DWARF2_UNWIND_INFO 1
 327 #endif
 328
 329 /* If we have named sections, and we're using crtstuff to run ctors,
 330    use them for registering eh frame information.  */
 331 #if defined (TARGET_ASM_NAMED_SECTION) && DWARF2_UNWIND_INFO \
 332     && !defined(EH_FRAME_IN_DATA_SECTION)
 333 #ifndef EH_FRAME_SECTION_NAME
 334 #define EH_FRAME_SECTION_NAME ".eh_frame"
 335 #endif
 336 #endif
 337
 338 /* On many systems, different EH table encodings are used under
 339    difference circumstances.  Some will require runtime relocations;
 340    some will not.  For those that do not require runtime relocations,
 341    we would like to make the table read-only.  However, since the
 342    read-only tables may need to be combined with read-write tables
 343    that do require runtime relocation, it is not safe to make the
 344    tables read-only unless the linker will merge read-only and
 345    read-write sections into a single read-write section.  If your
 346    linker does not have this ability, but your system is such that no
 347    encoding used with non-PIC code will ever require a runtime
 348    relocation, then you can define EH_TABLES_CAN_BE_READ_ONLY to 1 in
 349    your target configuration file.  */
 350 #ifndef EH_TABLES_CAN_BE_READ_ONLY
 351 #ifdef HAVE_LD_RO_RW_SECTION_MIXING
 352 #define EH_TABLES_CAN_BE_READ_ONLY 1
 353 #else
 354 #define EH_TABLES_CAN_BE_READ_ONLY 0
 355 #endif
 356 #endif
 357
 358 /* If we have named section and we support weak symbols, then use the
 359    .jcr section for recording java classes which need to be registered
 360    at program start-up time.  */
 361 #if defined (TARGET_ASM_NAMED_SECTION) && SUPPORTS_WEAK
 362 #ifndef JCR_SECTION_NAME
 363 #define JCR_SECTION_NAME ".jcr"
 364 #endif
 365 #endif
 366
 367 /* This decision to use a .jcr section can be overridden by defining
 368    USE_JCR_SECTION to 0 in target file.  This is necessary if target
 369    can define JCR_SECTION_NAME but does not have crtstuff or
 370    linker support for .jcr section.  */
 371 #ifndef TARGET_USE_JCR_SECTION
 372 #ifdef JCR_SECTION_NAME
 373 #define TARGET_USE_JCR_SECTION 1
 374 #else
 375 #define TARGET_USE_JCR_SECTION 0
 376 #endif
 377 #endif
 378
 379 /* Number of hardware registers that go into the DWARF-2 unwind info.
 380    If not defined, equals FIRST_PSEUDO_REGISTER  */
 381
 382 #ifndef DWARF_FRAME_REGISTERS
 383 #define DWARF_FRAME_REGISTERS FIRST_PSEUDO_REGISTER
 384 #endif
 385
 386 /* How to renumber registers for dbx and gdb.  If not defined, assume
 387    no renumbering is necessary.  */
 388
 389 #ifndef DBX_REGISTER_NUMBER
 390 #define DBX_REGISTER_NUMBER(REGNO) (REGNO)
 391 #endif
 392
 393 /* Default sizes for base C types.  If the sizes are different for
 394    your target, you should override these values by defining the
 395    appropriate symbols in your tm.h file.  */
 396
 397 #ifndef BITS_PER_UNIT
 398 #define BITS_PER_UNIT 8
 399 #endif
 400
 401 #ifndef BITS_PER_WORD
 402 #define BITS_PER_WORD (BITS_PER_UNIT * UNITS_PER_WORD)
 403 #endif
 404
 405 #ifndef CHAR_TYPE_SIZE
 406 #define CHAR_TYPE_SIZE BITS_PER_UNIT
 407 #endif
 408
 409 #ifndef BOOL_TYPE_SIZE
 410 /* `bool' has size and alignment `1', on almost all platforms.  */
 411 #define BOOL_TYPE_SIZE CHAR_TYPE_SIZE
 412 #endif
 413
 414 #ifndef SHORT_TYPE_SIZE
 415 #define SHORT_TYPE_SIZE (BITS_PER_UNIT * MIN ((UNITS_PER_WORD + 1) / 2, 2))
 416 #endif
 417
 418 #ifndef INT_TYPE_SIZE
 419 #define INT_TYPE_SIZE BITS_PER_WORD
 420 #endif
 421
 422 #ifndef LONG_TYPE_SIZE
 423 #define LONG_TYPE_SIZE BITS_PER_WORD
 424 #endif
 425
 426 #ifndef LONG_LONG_TYPE_SIZE
 427 #define LONG_LONG_TYPE_SIZE (BITS_PER_WORD * 2)
 428 #endif
 429
 430 #ifndef WCHAR_TYPE_SIZE
 431 #define WCHAR_TYPE_SIZE INT_TYPE_SIZE
 432 #endif
 433
 434 #ifndef FLOAT_TYPE_SIZE
 435 #define FLOAT_TYPE_SIZE BITS_PER_WORD
 436 #endif
 437
 438 #ifndef DOUBLE_TYPE_SIZE
 439 #define DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
 440 #endif
 441
 442 #ifndef LONG_DOUBLE_TYPE_SIZE
 443 #define LONG_DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
 444 #endif
 445
 446 #ifndef DECIMAL32_TYPE_SIZE
 447 #define DECIMAL32_TYPE_SIZE 32
 448 #endif
 449
 450 #ifndef DECIMAL64_TYPE_SIZE
 451 #define DECIMAL64_TYPE_SIZE 64
 452 #endif
 453
 454 #ifndef DECIMAL128_TYPE_SIZE
 455 #define DECIMAL128_TYPE_SIZE 128
 456 #endif
 457
 458 /* Width in bits of a pointer.  Mind the value of the macro `Pmode'.  */
 459 #ifndef POINTER_SIZE
 460 #define POINTER_SIZE BITS_PER_WORD
 461 #endif
 462
 463 #ifndef PIC_OFFSET_TABLE_REGNUM
 464 #define PIC_OFFSET_TABLE_REGNUM INVALID_REGNUM
 465 #endif
 466
 467 #ifndef TARGET_DLLIMPORT_DECL_ATTRIBUTES
 468 #define TARGET_DLLIMPORT_DECL_ATTRIBUTES 0
 469 #endif
 470
 471 #ifndef TARGET_DECLSPEC
 472 #if TARGET_DLLIMPORT_DECL_ATTRIBUTES
 473 /* If the target supports the "dllimport" attribute, users are
 474    probably used to the "__declspec" syntax.  */
 475 #define TARGET_DECLSPEC 1
 476 #else
 477 #define TARGET_DECLSPEC 0
 478 #endif
 479 #endif
 480
 481 /* By default, the preprocessor should be invoked the same way in C++
 482    as in C.  */
 483 #ifndef CPLUSPLUS_CPP_SPEC
 484 #ifdef CPP_SPEC
 485 #define CPLUSPLUS_CPP_SPEC CPP_SPEC
 486 #endif
 487 #endif
 488
 489 #ifndef ACCUMULATE_OUTGOING_ARGS
 490 #define ACCUMULATE_OUTGOING_ARGS 0
 491 #endif
 492
 493 /* Supply a default definition for PUSH_ARGS.  */
 494 #ifndef PUSH_ARGS
 495 #ifdef PUSH_ROUNDING
 496 #define PUSH_ARGS       !ACCUMULATE_OUTGOING_ARGS
 497 #else
 498 #define PUSH_ARGS       0
 499 #endif
 500 #endif
 501
 502 /* Decide whether a function's arguments should be processed
 503    from first to last or from last to first.
 504
 505    They should if the stack and args grow in opposite directions, but
 506    only if we have push insns.  */
 507
 508 #ifdef PUSH_ROUNDING
 509
 510 #ifndef PUSH_ARGS_REVERSED
 511 #if defined (STACK_GROWS_DOWNWARD) != defined (ARGS_GROW_DOWNWARD)
 512 #define PUSH_ARGS_REVERSED  PUSH_ARGS
 513 #endif
 514 #endif
 515
 516 #endif
 517
 518 #ifndef PUSH_ARGS_REVERSED
 519 #define PUSH_ARGS_REVERSED 0
 520 #endif
 521
 522 /* If PREFERRED_STACK_BOUNDARY is not defined, set it to STACK_BOUNDARY.
 523    STACK_BOUNDARY is required.  */
 524 #ifndef PREFERRED_STACK_BOUNDARY
 525 #define PREFERRED_STACK_BOUNDARY STACK_BOUNDARY
 526 #endif
 527
 528 #ifndef TARGET_DEFAULT_PACK_STRUCT
 529 #define TARGET_DEFAULT_PACK_STRUCT 0
 530 #endif
 531
 532 /* By default, the C++ compiler will use function addresses in the
 533    vtable entries.  Setting this nonzero tells the compiler to use
 534    function descriptors instead.  The value of this macro says how
 535    many words wide the descriptor is (normally 2).  It is assumed
 536    that the address of a function descriptor may be treated as a
 537    pointer to a function.  */
 538 #ifndef TARGET_VTABLE_USES_DESCRIPTORS
 539 #define TARGET_VTABLE_USES_DESCRIPTORS 0
 540 #endif
 541
 542 /* By default, the vtable entries are void pointers, the so the alignment
 543    is the same as pointer alignment.  The value of this macro specifies
 544    the alignment of the vtable entry in bits.  It should be defined only
 545    when special alignment is necessary.  */
 546 #ifndef TARGET_VTABLE_ENTRY_ALIGN
 547 #define TARGET_VTABLE_ENTRY_ALIGN POINTER_SIZE
 548 #endif
 549
 550 /* There are a few non-descriptor entries in the vtable at offsets below
 551    zero.  If these entries must be padded (say, to preserve the alignment
 552    specified by TARGET_VTABLE_ENTRY_ALIGN), set this to the number of
 553    words in each data entry.  */
 554 #ifndef TARGET_VTABLE_DATA_ENTRY_DISTANCE
 555 #define TARGET_VTABLE_DATA_ENTRY_DISTANCE 1
 556 #endif
 557
 558 /* Decide whether it is safe to use a local alias for a virtual function
 559    when constructing thunks.  */
 560 #ifndef TARGET_USE_LOCAL_THUNK_ALIAS_P
 561 #ifdef ASM_OUTPUT_DEF
 562 #define TARGET_USE_LOCAL_THUNK_ALIAS_P(DECL) 1
 563 #else
 564 #define TARGET_USE_LOCAL_THUNK_ALIAS_P(DECL) 0
 565 #endif
 566 #endif
 567
 568 /* Select a format to encode pointers in exception handling data.  We
 569    prefer those that result in fewer dynamic relocations.  Assume no
 570    special support here and encode direct references.  */
 571 #ifndef ASM_PREFERRED_EH_DATA_FORMAT
 572 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE,GLOBAL)  DW_EH_PE_absptr
 573 #endif
 574
 575 /* By default, the C++ compiler will use the lowest bit of the pointer
 576    to function to indicate a pointer-to-member-function points to a
 577    virtual member function.  However, if FUNCTION_BOUNDARY indicates
 578    function addresses aren't always even, the lowest bit of the delta
 579    field will be used.  */
 580 #ifndef TARGET_PTRMEMFUNC_VBIT_LOCATION
 581 #define TARGET_PTRMEMFUNC_VBIT_LOCATION \
 582   (FUNCTION_BOUNDARY >= 2 * BITS_PER_UNIT \
 583    ? ptrmemfunc_vbit_in_pfn : ptrmemfunc_vbit_in_delta)
 584 #endif
 585
 586 #ifndef DEFAULT_GDB_EXTENSIONS
 587 #define DEFAULT_GDB_EXTENSIONS 1
 588 #endif
 589
 590 /* If more than one debugging type is supported, you must define
 591    PREFERRED_DEBUGGING_TYPE to choose the default.  */
 592
 593 #if 1 < (defined (DBX_DEBUGGING_INFO) + defined (SDB_DEBUGGING_INFO) \
 594          + defined (DWARF2_DEBUGGING_INFO) + defined (XCOFF_DEBUGGING_INFO) \
 595          + defined (VMS_DEBUGGING_INFO))
 596 #ifndef PREFERRED_DEBUGGING_TYPE
 597 #error You must define PREFERRED_DEBUGGING_TYPE
 598 #endif /* no PREFERRED_DEBUGGING_TYPE */
 599
 600 /* If only one debugging format is supported, define PREFERRED_DEBUGGING_TYPE
 601    here so other code needn't care.  */
 602 #elif defined DBX_DEBUGGING_INFO
 603 #define PREFERRED_DEBUGGING_TYPE DBX_DEBUG
 604
 605 #elif defined SDB_DEBUGGING_INFO
 606 #define PREFERRED_DEBUGGING_TYPE SDB_DEBUG
 607
 608 #elif defined DWARF2_DEBUGGING_INFO
 609 #define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
 610
 611 #elif defined VMS_DEBUGGING_INFO
 612 #define PREFERRED_DEBUGGING_TYPE VMS_AND_DWARF2_DEBUG
 613
 614 #elif defined XCOFF_DEBUGGING_INFO
 615 #define PREFERRED_DEBUGGING_TYPE XCOFF_DEBUG
 616
 617 #else
 618 /* No debugging format is supported by this target.  */
 619 #define PREFERRED_DEBUGGING_TYPE NO_DEBUG
 620 #endif
 621
 622 /* Define codes for all the float formats that we know of.  */
 623 #define UNKNOWN_FLOAT_FORMAT 0
 624 #define IEEE_FLOAT_FORMAT 1
 625 #define VAX_FLOAT_FORMAT 2
 626 #define IBM_FLOAT_FORMAT 3
 627 #define C4X_FLOAT_FORMAT 4
 628
 629 /* Default to IEEE float if not specified.  Nearly all machines use it.  */
 630 #ifndef TARGET_FLOAT_FORMAT
 631 #define TARGET_FLOAT_FORMAT     IEEE_FLOAT_FORMAT
 632 #endif
 633
 634 #ifndef LARGEST_EXPONENT_IS_NORMAL
 635 #define LARGEST_EXPONENT_IS_NORMAL(SIZE) 0
 636 #endif
 637
 638 #ifndef ROUND_TOWARDS_ZERO
 639 #define ROUND_TOWARDS_ZERO 0
 640 #endif
 641
 642 #ifndef MODE_HAS_NANS
 643 #define MODE_HAS_NANS(MODE)                                     \
 644   (FLOAT_MODE_P (MODE)                                          \
 645    && TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT                  \
 646    && !LARGEST_EXPONENT_IS_NORMAL (GET_MODE_BITSIZE (MODE)))
 647 #endif
 648
 649 #ifndef MODE_HAS_INFINITIES
 650 #define MODE_HAS_INFINITIES(MODE)                               \
 651   (FLOAT_MODE_P (MODE)                                          \
 652    && TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT                  \
 653    && !LARGEST_EXPONENT_IS_NORMAL (GET_MODE_BITSIZE (MODE)))
 654 #endif
 655
 656 #ifndef MODE_HAS_SIGNED_ZEROS
 657 #define MODE_HAS_SIGNED_ZEROS(MODE) \
 658   (FLOAT_MODE_P (MODE) && TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT)
 659 #endif
 660
 661 #ifndef MODE_HAS_SIGN_DEPENDENT_ROUNDING
 662 #define MODE_HAS_SIGN_DEPENDENT_ROUNDING(MODE)                  \
 663   (FLOAT_MODE_P (MODE)                                          \
 664    && TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT                  \
 665    && !ROUND_TOWARDS_ZERO)
 666 #endif
 667
 668 #ifndef FLOAT_LIB_COMPARE_RETURNS_BOOL
 669 #define FLOAT_LIB_COMPARE_RETURNS_BOOL(MODE, COMPARISON) false
 670 #endif
 671
 672 /* True if the targets integer-comparison functions return { 0, 1, 2
 673    } to indicate { <, ==, > }.  False if { -1, 0, 1 } is used
 674    instead.  The libgcc routines are biased.  */
 675 #ifndef TARGET_LIB_INT_CMP_BIASED
 676 #define TARGET_LIB_INT_CMP_BIASED (true)
 677 #endif
 678
 679 /* If FLOAT_WORDS_BIG_ENDIAN is not defined in the header files,
 680    then the word-endianness is the same as for integers.  */
 681 #ifndef FLOAT_WORDS_BIG_ENDIAN
 682 #define FLOAT_WORDS_BIG_ENDIAN WORDS_BIG_ENDIAN
 683 #endif
 684
 685 #ifndef TARGET_FLT_EVAL_METHOD
 686 #define TARGET_FLT_EVAL_METHOD 0
 687 #endif
 688
 689 #ifndef TARGET_DEC_EVAL_METHOD
 690 #define TARGET_DEC_EVAL_METHOD 2
 691 #endif
 692
 693 #ifndef HOT_TEXT_SECTION_NAME
 694 #define HOT_TEXT_SECTION_NAME ".text.hot"
 695 #endif
 696
 697 #ifndef UNLIKELY_EXECUTED_TEXT_SECTION_NAME
 698 #define UNLIKELY_EXECUTED_TEXT_SECTION_NAME ".text.unlikely"
 699 #endif
 700
 701 #ifndef HAS_LONG_COND_BRANCH
 702 #define HAS_LONG_COND_BRANCH 0
 703 #endif
 704
 705 #ifndef HAS_LONG_UNCOND_BRANCH
 706 #define HAS_LONG_UNCOND_BRANCH 0
 707 #endif
 708
 709 /* By default, only attempt to parallelize bitwise operations, and
 710    possibly adds/subtracts using bit-twiddling.  */
 711 #ifndef UNITS_PER_SIMD_WORD
 712 #define UNITS_PER_SIMD_WORD UNITS_PER_WORD
 713 #endif
 714
 715 /* Determine whether __cxa_atexit, rather than atexit, is used to
 716    register C++ destructors for local statics and global objects.  */
 717 #ifndef DEFAULT_USE_CXA_ATEXIT
 718 #define DEFAULT_USE_CXA_ATEXIT 0
 719 #endif
 720
 721 /* If none of these macros are defined, the port must use the new
 722    technique of defining constraints in the machine description.
 723    tm_p.h will define those macros that machine-independent code
 724    still uses.  */
 725 #if  !defined CONSTRAINT_LEN                    \
 726   && !defined REG_CLASS_FROM_LETTER             \
 727   && !defined REG_CLASS_FROM_CONSTRAINT         \
 728   && !defined CONST_OK_FOR_LETTER_P             \
 729   && !defined CONST_OK_FOR_CONSTRAINT_P         \
 730   && !defined CONST_DOUBLE_OK_FOR_LETTER_P      \
 731   && !defined CONST_DOUBLE_OK_FOR_CONSTRAINT_P  \
 732   && !defined EXTRA_CONSTRAINT                  \
 733   && !defined EXTRA_CONSTRAINT_STR              \
 734   && !defined EXTRA_MEMORY_CONSTRAINT           \
 735   && !defined EXTRA_ADDRESS_CONSTRAINT
 736
 737 #define USE_MD_CONSTRAINTS
 738
 739 #if GCC_VERSION >= 3000 && defined IN_GCC
 740 /* These old constraint macros shouldn't appear anywhere in a
 741    configuration using MD constraint definitions.  */
 742 #pragma GCC poison REG_CLASS_FROM_LETTER CONST_OK_FOR_LETTER_P \
 743                    CONST_DOUBLE_OK_FOR_LETTER_P EXTRA_CONSTRAINT
 744 #endif
 745
 746 #else /* old constraint mechanism in use */
 747
 748 /* Determine whether extra constraint letter should be handled
 749    via address reload (like 'o').  */
 750 #ifndef EXTRA_MEMORY_CONSTRAINT
 751 #define EXTRA_MEMORY_CONSTRAINT(C,STR) 0
 752 #endif
 753
 754 /* Determine whether extra constraint letter should be handled
 755    as an address (like 'p').  */
 756 #ifndef EXTRA_ADDRESS_CONSTRAINT
 757 #define EXTRA_ADDRESS_CONSTRAINT(C,STR) 0
 758 #endif
 759
 760 /* When a port defines CONSTRAINT_LEN, it should use DEFAULT_CONSTRAINT_LEN
 761    for all the characters that it does not want to change, so things like the
 762   'length' of a digit in a matching constraint is an implementation detail,
 763    and not part of the interface.  */
 764 #define DEFAULT_CONSTRAINT_LEN(C,STR) 1
 765
 766 #ifndef CONSTRAINT_LEN
 767 #define CONSTRAINT_LEN(C,STR) DEFAULT_CONSTRAINT_LEN (C, STR)
 768 #endif
 769
 770 #if defined (CONST_OK_FOR_LETTER_P) && ! defined (CONST_OK_FOR_CONSTRAINT_P)
 771 #define CONST_OK_FOR_CONSTRAINT_P(VAL,C,STR) CONST_OK_FOR_LETTER_P (VAL, C)
 772 #endif
 773
 774 #if defined (CONST_DOUBLE_OK_FOR_LETTER_P) && ! defined (CONST_DOUBLE_OK_FOR_CONSTRAINT_P)
 775 #define CONST_DOUBLE_OK_FOR_CONSTRAINT_P(OP,C,STR) \
 776   CONST_DOUBLE_OK_FOR_LETTER_P (OP, C)
 777 #endif
 778
 779 #ifndef REG_CLASS_FROM_CONSTRAINT
 780 #define REG_CLASS_FROM_CONSTRAINT(C,STR) REG_CLASS_FROM_LETTER (C)
 781 #endif
 782
 783 #if defined (EXTRA_CONSTRAINT) && ! defined (EXTRA_CONSTRAINT_STR)
 784 #define EXTRA_CONSTRAINT_STR(OP, C,STR) EXTRA_CONSTRAINT (OP, C)
 785 #endif
 786
 787 #endif /* old constraint mechanism in use */
 788
 789 #ifndef REGISTER_MOVE_COST
 790 #define REGISTER_MOVE_COST(m, x, y) 2
 791 #endif
 792
 793 /* Determine whether the entire c99 runtime
 794    is present in the runtime library.  */
 795 #ifndef TARGET_C99_FUNCTIONS
 796 #define TARGET_C99_FUNCTIONS 0
 797 #endif
 798
 799 /* Indicate that CLZ and CTZ are undefined at zero.  */
 800 #ifndef CLZ_DEFINED_VALUE_AT_ZERO
 801 #define CLZ_DEFINED_VALUE_AT_ZERO(MODE, VALUE)  0
 802 #endif
 803 #ifndef CTZ_DEFINED_VALUE_AT_ZERO
 804 #define CTZ_DEFINED_VALUE_AT_ZERO(MODE, VALUE)  0
 805 #endif
 806
 807 /* Provide a default value for STORE_FLAG_VALUE.  */
 808 #ifndef STORE_FLAG_VALUE
 809 #define STORE_FLAG_VALUE  1
 810 #endif
 811
 812 /* This macro is used to determine what the largest unit size that
 813    move_by_pieces can use is.  */
 814
 815 /* MOVE_MAX_PIECES is the number of bytes at a time which we can
 816    move efficiently, as opposed to  MOVE_MAX which is the maximum
 817    number of bytes we can move with a single instruction.  */
 818
 819 #ifndef MOVE_MAX_PIECES
 820 #define MOVE_MAX_PIECES   MOVE_MAX
 821 #endif
 822
 823 #ifndef STACK_POINTER_OFFSET
 824 #define STACK_POINTER_OFFSET    0
 825 #endif
 826
 827 #ifndef LOCAL_REGNO
 828 #define LOCAL_REGNO(REGNO)  0
 829 #endif
 830
 831 /* EXIT_IGNORE_STACK should be nonzero if, when returning from a function,
 832    the stack pointer does not matter.  The value is tested only in
 833    functions that have frame pointers.  */
 834 #ifndef EXIT_IGNORE_STACK
 835 #define EXIT_IGNORE_STACK 0
 836 #endif
 837
 838 /* Assume that case vectors are not pc-relative.  */
 839 #ifndef CASE_VECTOR_PC_RELATIVE
 840 #define CASE_VECTOR_PC_RELATIVE 0
 841 #endif
 842
 843 /* Assume that trampolines need function alignment.  */
 844 #ifndef TRAMPOLINE_ALIGNMENT
 845 #define TRAMPOLINE_ALIGNMENT FUNCTION_BOUNDARY
 846 #endif
 847
 848 /* Register mappings for target machines without register windows.  */
 849 #ifndef INCOMING_REGNO
 850 #define INCOMING_REGNO(N) (N)
 851 #endif
 852
 853 #ifndef OUTGOING_REGNO
 854 #define OUTGOING_REGNO(N) (N)
 855 #endif
 856
 857 #ifndef SHIFT_COUNT_TRUNCATED
 858 #define SHIFT_COUNT_TRUNCATED 0
 859 #endif
 860
 861 #ifndef LEGITIMIZE_ADDRESS
 862 #define LEGITIMIZE_ADDRESS(X, OLDX, MODE, WIN)
 863 #endif
 864
 865 #ifndef LEGITIMATE_PIC_OPERAND_P
 866 #define LEGITIMATE_PIC_OPERAND_P(X) 1
 867 #endif
 868
 869 #ifndef REVERSIBLE_CC_MODE
 870 #define REVERSIBLE_CC_MODE(MODE) 0
 871 #endif
 872
 873 /* Biggest alignment supported by the object file format of this machine.  */
 874 #ifndef MAX_OFILE_ALIGNMENT
 875 #define MAX_OFILE_ALIGNMENT BIGGEST_ALIGNMENT
 876 #endif
 877
 878 #ifndef FRAME_GROWS_DOWNWARD
 879 #define FRAME_GROWS_DOWNWARD 0
 880 #endif
 881
 882 /* On most machines, the CFA coincides with the first incoming parm.  */
 883 #ifndef ARG_POINTER_CFA_OFFSET
 884 #define ARG_POINTER_CFA_OFFSET(FNDECL) FIRST_PARM_OFFSET (FNDECL)
 885 #endif
 886
 887 /* On most machines, we use the CFA as DW_AT_frame_base.  */
 888 #ifndef CFA_FRAME_BASE_OFFSET
 889 #define CFA_FRAME_BASE_OFFSET(FNDECL) 0
 890 #endif
 891
 892 /* The offset from the incoming value of %sp to the top of the stack frame
 893    for the current function.  */
 894 #ifndef INCOMING_FRAME_SP_OFFSET
 895 #define INCOMING_FRAME_SP_OFFSET 0
 896 #endif
 897
 898 #endif  /* ! GCC_DEFAULTS_H */