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