gcc/defaults.h

   1 /* Definitions of various defaults for tm.h macros.
   2    Copyright (C) 1992, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004
   3    Free Software Foundation, Inc.
   4    Contributed by Ron Guilmette (rfg@monkeys.com)
   5
   6 This file is part of GCC.
   7
   8 GCC is free software; you can redistribute it and/or modify it under
   9 the terms of the GNU General Public License as published by the Free
  10 Software Foundation; either version 2, or (at your option) any later
  11 version.
  12
  13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  15 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  16 for more details.
  17
  18 You should have received a copy of the GNU General Public License
  19 along with GCC; see the file COPYING.  If not, write to the Free
  20 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
  21 02111-1307, USA.  */
  22
  23 #ifndef GCC_DEFAULTS_H
  24 #define GCC_DEFAULTS_H
  25
  26 #ifndef GET_ENVIRONMENT
  27 #define GET_ENVIRONMENT(VALUE, NAME) do { (VALUE) = getenv (NAME); } while (0)
  28 #endif
  29
  30 #define obstack_chunk_alloc     ((void *(*) (long)) xmalloc)
  31 #define obstack_chunk_free      ((void (*) (void *)) free)
  32 #define OBSTACK_CHUNK_SIZE      0
  33 #define gcc_obstack_init(OBSTACK)                       \
  34   _obstack_begin ((OBSTACK), OBSTACK_CHUNK_SIZE, 0,     \
  35                   obstack_chunk_alloc,                  \
  36                   obstack_chunk_free)
  37
  38 /* Define default standard character escape sequences.  */
  39 #ifndef TARGET_BELL
  40 #  define TARGET_BELL 007
  41 #  define TARGET_BS 010
  42 #  define TARGET_CR 015
  43 #  define TARGET_DIGIT0 060
  44 #  define TARGET_ESC 033
  45 #  define TARGET_FF 014
  46 #  define TARGET_NEWLINE 012
  47 #  define TARGET_TAB 011
  48 #  define TARGET_VT 013
  49 #endif
  50
  51 /* Store in OUTPUT a string (made with alloca) containing an
  52    assembler-name for a local static variable or function named NAME.
  53    LABELNO is an integer which is different for each call.  */
  54
  55 #ifndef ASM_PN_FORMAT
  56 # ifndef NO_DOT_IN_LABEL
  57 #  define ASM_PN_FORMAT "%s.%lu"
  58 # else
  59 #  ifndef NO_DOLLAR_IN_LABEL
  60 #   define ASM_PN_FORMAT "%s$%lu"
  61 #  else
  62 #   define ASM_PN_FORMAT "__%s_%lu"
  63 #  endif
  64 # endif
  65 #endif /* ! ASM_PN_FORMAT */
  66
  67 #ifndef ASM_FORMAT_PRIVATE_NAME
  68 # define ASM_FORMAT_PRIVATE_NAME(OUTPUT, NAME, LABELNO) \
  69   do { const char *const name_ = (NAME); \
  70        char *const output_ = (OUTPUT) = \
  71          (char *) alloca (strlen (name_) + 32); \
  72        sprintf (output_, ASM_PN_FORMAT, name_, (unsigned long)(LABELNO)); \
  73   } while (0)
  74 #endif
  75
  76 /* This is how to output an element of a case-vector that is absolute.
  77    Some targets don't use this, but we have to define it anyway.  */
  78
  79 #ifndef ASM_OUTPUT_ADDR_VEC_ELT
  80 #define ASM_OUTPUT_ADDR_VEC_ELT(FILE, VALUE)  \
  81 do { fputs (integer_asm_op (POINTER_SIZE / BITS_PER_UNIT, TRUE), FILE); \
  82      (*targetm.asm_out.internal_label) (FILE, "L", (VALUE));                    \
  83      fputc ('\n', FILE);                                                \
  84    } while (0)
  85 #endif
  86
  87 /* Choose a reasonable default for ASM_OUTPUT_ASCII.  */
  88
  89 #ifndef ASM_OUTPUT_ASCII
  90 #define ASM_OUTPUT_ASCII(MYFILE, MYSTRING, MYLENGTH) \
  91   do {                                                                        \
  92     FILE *_hide_asm_out_file = (MYFILE);                                      \
  93     const unsigned char *_hide_p = (const unsigned char *) (MYSTRING);        \
  94     int _hide_thissize = (MYLENGTH);                                          \
  95     {                                                                         \
  96       FILE *asm_out_file = _hide_asm_out_file;                                \
  97       const unsigned char *p = _hide_p;                                       \
  98       int thissize = _hide_thissize;                                          \
  99       int i;                                                                  \
 100       fprintf (asm_out_file, "\t.ascii \"");                                  \
 101                                                                               \
 102       for (i = 0; i < thissize; i++)                                          \
 103         {                                                                     \
 104           int c = p[i];                                                       \
 105           if (c == '\"' || c == '\\')                                         \
 106             putc ('\\', asm_out_file);                                        \
 107           if (ISPRINT(c))                                                     \
 108             putc (c, asm_out_file);                                           \
 109           else                                                                \
 110             {                                                                 \
 111               fprintf (asm_out_file, "\\%o", c);                              \
 112               /* After an octal-escape, if a digit follows,                   \
 113                  terminate one string constant and start another.             \
 114                  The VAX assembler fails to stop reading the escape           \
 115                  after three digits, so this is the only way we               \
 116                  can get it to parse the data properly.  */                   \
 117               if (i < thissize - 1 && ISDIGIT(p[i + 1]))                      \
 118                 fprintf (asm_out_file, "\"\n\t.ascii \"");                    \
 119           }                                                                   \
 120         }                                                                     \
 121       fprintf (asm_out_file, "\"\n");                                         \
 122     }                                                                         \
 123   }                                                                           \
 124   while (0)
 125 #endif
 126
 127 /* This is how we tell the assembler to equate two values.  */
 128 #ifdef SET_ASM_OP
 129 #ifndef ASM_OUTPUT_DEF
 130 #define ASM_OUTPUT_DEF(FILE,LABEL1,LABEL2)                              \
 131  do {   fprintf ((FILE), "%s", SET_ASM_OP);                             \
 132         assemble_name (FILE, LABEL1);                                   \
 133         fprintf (FILE, ",");                                            \
 134         assemble_name (FILE, LABEL2);                                   \
 135         fprintf (FILE, "\n");                                           \
 136   } while (0)
 137 #endif
 138 #endif
 139
 140 /* This is how to output the definition of a user-level label named
 141    NAME, such as the label on a static function or variable NAME.  */
 142
 143 #ifndef ASM_OUTPUT_LABEL
 144 #define ASM_OUTPUT_LABEL(FILE,NAME) \
 145   do { assemble_name ((FILE), (NAME)); fputs (":\n", (FILE)); } while (0)
 146 #endif
 147
 148 /* Output the definition of a compiler-generated label named NAME.  */
 149 #ifndef ASM_OUTPUT_INTERNAL_LABEL
 150 #define ASM_OUTPUT_INTERNAL_LABEL(FILE,NAME)    \
 151   do {                                          \
 152     assemble_name_raw ((FILE), (NAME));         \
 153     fputs (":\n", (FILE));                      \
 154   } while (0)
 155 #endif
 156
 157 /* This is how to output a reference to a user-level label named NAME.  */
 158
 159 #ifndef ASM_OUTPUT_LABELREF
 160 #define ASM_OUTPUT_LABELREF(FILE,NAME)  asm_fprintf ((FILE), "%U%s", (NAME))
 161 #endif
 162
 163 /* Allow target to print debug info labels specially.  This is useful for
 164    VLIW targets, since debug info labels should go into the middle of
 165    instruction bundles instead of breaking them.  */
 166
 167 #ifndef ASM_OUTPUT_DEBUG_LABEL
 168 #define ASM_OUTPUT_DEBUG_LABEL(FILE, PREFIX, NUM) \
 169   (*targetm.asm_out.internal_label) (FILE, PREFIX, NUM)
 170 #endif
 171
 172 /* This is how we tell the assembler that a symbol is weak.  */
 173 #ifndef ASM_OUTPUT_WEAK_ALIAS
 174 #if defined (ASM_WEAKEN_LABEL) && defined (ASM_OUTPUT_DEF)
 175 #define ASM_OUTPUT_WEAK_ALIAS(STREAM, NAME, VALUE)      \
 176   do                                                    \
 177     {                                                   \
 178       ASM_WEAKEN_LABEL (STREAM, NAME);                  \
 179       if (VALUE)                                        \
 180         ASM_OUTPUT_DEF (STREAM, NAME, VALUE);           \
 181     }                                                   \
 182   while (0)
 183 #endif
 184 #endif
 185
 186 /* How to emit a .type directive.  */
 187 #ifndef ASM_OUTPUT_TYPE_DIRECTIVE
 188 #if defined TYPE_ASM_OP && defined TYPE_OPERAND_FMT
 189 #define ASM_OUTPUT_TYPE_DIRECTIVE(STREAM, NAME, TYPE)   \
 190   do                                                    \
 191     {                                                   \
 192       fputs (TYPE_ASM_OP, STREAM);                      \
 193       assemble_name (STREAM, NAME);                     \
 194       fputs (", ", STREAM);                             \
 195       fprintf (STREAM, TYPE_OPERAND_FMT, TYPE);         \
 196       putc ('\n', STREAM);                              \
 197     }                                                   \
 198   while (0)
 199 #endif
 200 #endif
 201
 202 /* How to emit a .size directive.  */
 203 #ifndef ASM_OUTPUT_SIZE_DIRECTIVE
 204 #ifdef SIZE_ASM_OP
 205 #define ASM_OUTPUT_SIZE_DIRECTIVE(STREAM, NAME, SIZE)   \
 206   do                                                    \
 207     {                                                   \
 208       HOST_WIDE_INT size_ = (SIZE);                     \
 209       fputs (SIZE_ASM_OP, STREAM);                      \
 210       assemble_name (STREAM, NAME);                     \
 211       fprintf (STREAM, ", " HOST_WIDE_INT_PRINT_DEC "\n", size_); \
 212     }                                                   \
 213   while (0)
 214
 215 #define ASM_OUTPUT_MEASURED_SIZE(STREAM, NAME)          \
 216   do                                                    \
 217     {                                                   \
 218       fputs (SIZE_ASM_OP, STREAM);                      \
 219       assemble_name (STREAM, NAME);                     \
 220       fputs (", .-", STREAM);                           \
 221       assemble_name (STREAM, NAME);                     \
 222       putc ('\n', STREAM);                              \
 223     }                                                   \
 224   while (0)
 225
 226 #endif
 227 #endif
 228
 229 /* This determines whether or not we support weak symbols.  */
 230 #ifndef SUPPORTS_WEAK
 231 #if defined (ASM_WEAKEN_LABEL) || defined (ASM_WEAKEN_DECL)
 232 #define SUPPORTS_WEAK 1
 233 #else
 234 #define SUPPORTS_WEAK 0
 235 #endif
 236 #endif
 237
 238 /* This determines whether or not we support link-once semantics.  */
 239 #ifndef SUPPORTS_ONE_ONLY
 240 #ifdef MAKE_DECL_ONE_ONLY
 241 #define SUPPORTS_ONE_ONLY 1
 242 #else
 243 #define SUPPORTS_ONE_ONLY 0
 244 #endif
 245 #endif
 246
 247 /* This determines whether weak symbols must be left out of a static
 248    archive's table of contents.  Defining this macro to be nonzero has
 249    the consequence that certain symbols will not be made weak that
 250    otherwise would be.  The C++ ABI requires this macro to be zero;
 251    see the documentation.  */
 252 #ifndef TARGET_WEAK_NOT_IN_ARCHIVE_TOC
 253 #define TARGET_WEAK_NOT_IN_ARCHIVE_TOC 0
 254 #endif
 255
 256 /* This determines whether or not we need linkonce unwind information.  */
 257 #ifndef TARGET_USES_WEAK_UNWIND_INFO
 258 #define TARGET_USES_WEAK_UNWIND_INFO 0
 259 #endif
 260
 261 /* By default, there is no prefix on user-defined symbols.  */
 262 #ifndef USER_LABEL_PREFIX
 263 #define USER_LABEL_PREFIX ""
 264 #endif
 265
 266 /* If the target supports weak symbols, define TARGET_ATTRIBUTE_WEAK to
 267    provide a weak attribute.  Else define it to nothing.
 268
 269    This would normally belong in ansidecl.h, but SUPPORTS_WEAK is
 270    not available at that time.
 271
 272    Note, this is only for use by target files which we know are to be
 273    compiled by GCC.  */
 274 #ifndef TARGET_ATTRIBUTE_WEAK
 275 # if SUPPORTS_WEAK
 276 #  define TARGET_ATTRIBUTE_WEAK __attribute__ ((weak))
 277 # else
 278 #  define TARGET_ATTRIBUTE_WEAK
 279 # endif
 280 #endif
 281
 282 /* Determines whether we may use common symbols to represent one-only
 283    semantics (a.k.a. "vague linkage").  */
 284 #ifndef USE_COMMON_FOR_ONE_ONLY
 285 # define USE_COMMON_FOR_ONE_ONLY 1
 286 #endif
 287
 288 /* By default we can assume that all global symbols are in one namespace,
 289    across all shared libraries.  */
 290 #ifndef MULTIPLE_SYMBOL_SPACES
 291 # define MULTIPLE_SYMBOL_SPACES 0
 292 #endif
 293
 294 /* If the target supports init_priority C++ attribute, give
 295    SUPPORTS_INIT_PRIORITY a nonzero value.  */
 296 #ifndef SUPPORTS_INIT_PRIORITY
 297 #define SUPPORTS_INIT_PRIORITY 1
 298 #endif /* SUPPORTS_INIT_PRIORITY */
 299
 300 /* If duplicate library search directories can be removed from a
 301    linker command without changing the linker's semantics, give this
 302    symbol a nonzero.  */
 303 #ifndef LINK_ELIMINATE_DUPLICATE_LDIRECTORIES
 304 #define LINK_ELIMINATE_DUPLICATE_LDIRECTORIES 0
 305 #endif /* LINK_ELIMINATE_DUPLICATE_LDIRECTORIES */
 306
 307 /* If we have a definition of INCOMING_RETURN_ADDR_RTX, assume that
 308    the rest of the DWARF 2 frame unwind support is also provided.  */
 309 #if !defined (DWARF2_UNWIND_INFO) && defined (INCOMING_RETURN_ADDR_RTX)
 310 #define DWARF2_UNWIND_INFO 1
 311 #endif
 312
 313 /* If we have named sections, and we're using crtstuff to run ctors,
 314    use them for registering eh frame information.  */
 315 #if defined (TARGET_ASM_NAMED_SECTION) && DWARF2_UNWIND_INFO \
 316     && !defined(EH_FRAME_IN_DATA_SECTION)
 317 #ifndef EH_FRAME_SECTION_NAME
 318 #define EH_FRAME_SECTION_NAME ".eh_frame"
 319 #endif
 320 #endif
 321
 322 /* On many systems, different EH table encodings are used under
 323    difference circumstances.  Some will require runtime relocations;
 324    some will not.  For those that do not require runtime relocations,
 325    we would like to make the table read-only.  However, since the
 326    read-only tables may need to be combined with read-write tables
 327    that do require runtime relocation, it is not safe to make the
 328    tables read-only unless the linker will merge read-only and
 329    read-write sections into a single read-write section.  If your
 330    linker does not have this ability, but your system is such that no
 331    encoding used with non-PIC code will ever require a runtime
 332    relocation, then you can define EH_TABLES_CAN_BE_READ_ONLY to 1 in
 333    your target configuration file.  */
 334 #ifndef EH_TABLES_CAN_BE_READ_ONLY
 335 #ifdef HAVE_LD_RO_RW_SECTION_MIXING
 336 #define EH_TABLES_CAN_BE_READ_ONLY 1
 337 #else
 338 #define EH_TABLES_CAN_BE_READ_ONLY 0
 339 #endif
 340 #endif
 341
 342 /* If we have named section and we support weak symbols, then use the
 343    .jcr section for recording java classes which need to be registered
 344    at program start-up time.  */
 345 #if defined (TARGET_ASM_NAMED_SECTION) && SUPPORTS_WEAK
 346 #ifndef JCR_SECTION_NAME
 347 #define JCR_SECTION_NAME ".jcr"
 348 #endif
 349 #endif
 350
 351 /* This decision to use a .jcr section can be overridden by defining
 352    USE_JCR_SECTION to 0 in target file.  This is necessary if target
 353    can define JCR_SECTION_NAME but does not have crtstuff or
 354    linker support for .jcr section.  */
 355 #ifndef TARGET_USE_JCR_SECTION
 356 #ifdef JCR_SECTION_NAME
 357 #define TARGET_USE_JCR_SECTION 1
 358 #else
 359 #define TARGET_USE_JCR_SECTION 0
 360 #endif
 361 #endif
 362
 363 /* Number of hardware registers that go into the DWARF-2 unwind info.
 364    If not defined, equals FIRST_PSEUDO_REGISTER  */
 365
 366 #ifndef DWARF_FRAME_REGISTERS
 367 #define DWARF_FRAME_REGISTERS FIRST_PSEUDO_REGISTER
 368 #endif
 369
 370 /* How to renumber registers for dbx and gdb.  If not defined, assume
 371    no renumbering is necessary.  */
 372
 373 #ifndef DBX_REGISTER_NUMBER
 374 #define DBX_REGISTER_NUMBER(REGNO) (REGNO)
 375 #endif
 376
 377 /* Default sizes for base C types.  If the sizes are different for
 378    your target, you should override these values by defining the
 379    appropriate symbols in your tm.h file.  */
 380
 381 #ifndef BITS_PER_UNIT
 382 #define BITS_PER_UNIT 8
 383 #endif
 384
 385 #ifndef BITS_PER_WORD
 386 #define BITS_PER_WORD (BITS_PER_UNIT * UNITS_PER_WORD)
 387 #endif
 388
 389 #ifndef CHAR_TYPE_SIZE
 390 #define CHAR_TYPE_SIZE BITS_PER_UNIT
 391 #endif
 392
 393 #ifndef BOOL_TYPE_SIZE
 394 /* `bool' has size and alignment `1', on almost all platforms.  */
 395 #define BOOL_TYPE_SIZE CHAR_TYPE_SIZE
 396 #endif
 397
 398 #ifndef SHORT_TYPE_SIZE
 399 #define SHORT_TYPE_SIZE (BITS_PER_UNIT * MIN ((UNITS_PER_WORD + 1) / 2, 2))
 400 #endif
 401
 402 #ifndef INT_TYPE_SIZE
 403 #define INT_TYPE_SIZE BITS_PER_WORD
 404 #endif
 405
 406 #ifndef LONG_TYPE_SIZE
 407 #define LONG_TYPE_SIZE BITS_PER_WORD
 408 #endif
 409
 410 #ifndef LONG_LONG_TYPE_SIZE
 411 #define LONG_LONG_TYPE_SIZE (BITS_PER_WORD * 2)
 412 #endif
 413
 414 #ifndef WCHAR_TYPE_SIZE
 415 #define WCHAR_TYPE_SIZE INT_TYPE_SIZE
 416 #endif
 417
 418 #ifndef FLOAT_TYPE_SIZE
 419 #define FLOAT_TYPE_SIZE BITS_PER_WORD
 420 #endif
 421
 422 #ifndef DOUBLE_TYPE_SIZE
 423 #define DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
 424 #endif
 425
 426 #ifndef LONG_DOUBLE_TYPE_SIZE
 427 #define LONG_DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
 428 #endif
 429
 430 /* Width in bits of a pointer.  Mind the value of the macro `Pmode'.  */
 431 #ifndef POINTER_SIZE
 432 #define POINTER_SIZE BITS_PER_WORD
 433 #endif
 434
 435 #ifndef PIC_OFFSET_TABLE_REGNUM
 436 #define PIC_OFFSET_TABLE_REGNUM INVALID_REGNUM
 437 #endif
 438
 439 #ifndef TARGET_DLLIMPORT_DECL_ATTRIBUTES
 440 #define TARGET_DLLIMPORT_DECL_ATTRIBUTES 0
 441 #endif
 442
 443 #ifndef TARGET_DECLSPEC
 444 #if TARGET_DLLIMPORT_DECL_ATTRIBUTES
 445 /* If the target supports the "dllimport" attribute, users are
 446    probably used to the "__declspec" syntax.  */
 447 #define TARGET_DECLSPEC 1
 448 #else
 449 #define TARGET_DECLSPEC 0
 450 #endif
 451 #endif
 452
 453 /* By default, the preprocessor should be invoked the same way in C++
 454    as in C.  */
 455 #ifndef CPLUSPLUS_CPP_SPEC
 456 #ifdef CPP_SPEC
 457 #define CPLUSPLUS_CPP_SPEC CPP_SPEC
 458 #endif
 459 #endif
 460
 461 #ifndef ACCUMULATE_OUTGOING_ARGS
 462 #define ACCUMULATE_OUTGOING_ARGS 0
 463 #endif
 464
 465 /* Supply a default definition for PUSH_ARGS.  */
 466 #ifndef PUSH_ARGS
 467 #ifdef PUSH_ROUNDING
 468 #define PUSH_ARGS       !ACCUMULATE_OUTGOING_ARGS
 469 #else
 470 #define PUSH_ARGS       0
 471 #endif
 472 #endif
 473
 474 /* Decide whether a function's arguments should be processed
 475    from first to last or from last to first.
 476
 477    They should if the stack and args grow in opposite directions, but
 478    only if we have push insns.  */
 479
 480 #ifdef PUSH_ROUNDING
 481
 482 #ifndef PUSH_ARGS_REVERSED
 483 #if defined (STACK_GROWS_DOWNWARD) != defined (ARGS_GROW_DOWNWARD)
 484 #define PUSH_ARGS_REVERSED  PUSH_ARGS
 485 #endif
 486 #endif
 487
 488 #endif
 489
 490 #ifndef PUSH_ARGS_REVERSED
 491 #define PUSH_ARGS_REVERSED 0
 492 #endif
 493
 494 /* If PREFERRED_STACK_BOUNDARY is not defined, set it to STACK_BOUNDARY.
 495    STACK_BOUNDARY is required.  */
 496 #ifndef PREFERRED_STACK_BOUNDARY
 497 #define PREFERRED_STACK_BOUNDARY STACK_BOUNDARY
 498 #endif
 499
 500 #ifndef TARGET_DEFAULT_PACK_STRUCT
 501 #define TARGET_DEFAULT_PACK_STRUCT 0
 502 #endif
 503
 504 /* By default, the C++ compiler will use function addresses in the
 505    vtable entries.  Setting this nonzero tells the compiler to use
 506    function descriptors instead.  The value of this macro says how
 507    many words wide the descriptor is (normally 2).  It is assumed
 508    that the address of a function descriptor may be treated as a
 509    pointer to a function.  */
 510 #ifndef TARGET_VTABLE_USES_DESCRIPTORS
 511 #define TARGET_VTABLE_USES_DESCRIPTORS 0
 512 #endif
 513
 514 /* By default, the vtable entries are void pointers, the so the alignment
 515    is the same as pointer alignment.  The value of this macro specifies
 516    the alignment of the vtable entry in bits.  It should be defined only
 517    when special alignment is necessary.  */
 518 #ifndef TARGET_VTABLE_ENTRY_ALIGN
 519 #define TARGET_VTABLE_ENTRY_ALIGN POINTER_SIZE
 520 #endif
 521
 522 /* There are a few non-descriptor entries in the vtable at offsets below
 523    zero.  If these entries must be padded (say, to preserve the alignment
 524    specified by TARGET_VTABLE_ENTRY_ALIGN), set this to the number of
 525    words in each data entry.  */
 526 #ifndef TARGET_VTABLE_DATA_ENTRY_DISTANCE
 527 #define TARGET_VTABLE_DATA_ENTRY_DISTANCE 1
 528 #endif
 529
 530 /* Decide whether it is safe to use a local alias for a virtual function
 531    when constructing thunks.  */
 532 #ifndef TARGET_USE_LOCAL_THUNK_ALIAS_P
 533 #ifdef ASM_OUTPUT_DEF
 534 #define TARGET_USE_LOCAL_THUNK_ALIAS_P(DECL) 1
 535 #else
 536 #define TARGET_USE_LOCAL_THUNK_ALIAS_P(DECL) 0
 537 #endif
 538 #endif
 539
 540 /* Select a format to encode pointers in exception handling data.  We
 541    prefer those that result in fewer dynamic relocations.  Assume no
 542    special support here and encode direct references.  */
 543 #ifndef ASM_PREFERRED_EH_DATA_FORMAT
 544 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE,GLOBAL)  DW_EH_PE_absptr
 545 #endif
 546
 547 /* By default, the C++ compiler will use the lowest bit of the pointer
 548    to function to indicate a pointer-to-member-function points to a
 549    virtual member function.  However, if FUNCTION_BOUNDARY indicates
 550    function addresses aren't always even, the lowest bit of the delta
 551    field will be used.  */
 552 #ifndef TARGET_PTRMEMFUNC_VBIT_LOCATION
 553 #define TARGET_PTRMEMFUNC_VBIT_LOCATION \
 554   (FUNCTION_BOUNDARY >= 2 * BITS_PER_UNIT \
 555    ? ptrmemfunc_vbit_in_pfn : ptrmemfunc_vbit_in_delta)
 556 #endif
 557
 558 #ifndef DEFAULT_GDB_EXTENSIONS
 559 #define DEFAULT_GDB_EXTENSIONS 1
 560 #endif
 561
 562 /* If more than one debugging type is supported, you must define
 563    PREFERRED_DEBUGGING_TYPE to choose the default.  */
 564
 565 #if 1 < (defined (DBX_DEBUGGING_INFO) + defined (SDB_DEBUGGING_INFO) \
 566          + defined (DWARF2_DEBUGGING_INFO) + defined (XCOFF_DEBUGGING_INFO) \
 567          + defined (VMS_DEBUGGING_INFO))
 568 #ifndef PREFERRED_DEBUGGING_TYPE
 569 #error You must define PREFERRED_DEBUGGING_TYPE
 570 #endif /* no PREFERRED_DEBUGGING_TYPE */
 571
 572 /* If only one debugging format is supported, define PREFERRED_DEBUGGING_TYPE
 573    here so other code needn't care.  */
 574 #elif defined DBX_DEBUGGING_INFO
 575 #define PREFERRED_DEBUGGING_TYPE DBX_DEBUG
 576
 577 #elif defined SDB_DEBUGGING_INFO
 578 #define PREFERRED_DEBUGGING_TYPE SDB_DEBUG
 579
 580 #elif defined DWARF2_DEBUGGING_INFO
 581 #define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
 582
 583 #elif defined VMS_DEBUGGING_INFO
 584 #define PREFERRED_DEBUGGING_TYPE VMS_AND_DWARF2_DEBUG
 585
 586 #elif defined XCOFF_DEBUGGING_INFO
 587 #define PREFERRED_DEBUGGING_TYPE XCOFF_DEBUG
 588
 589 #else
 590 /* No debugging format is supported by this target.  */
 591 #define PREFERRED_DEBUGGING_TYPE NO_DEBUG
 592 #endif
 593
 594 /* Define codes for all the float formats that we know of.  */
 595 #define UNKNOWN_FLOAT_FORMAT 0
 596 #define IEEE_FLOAT_FORMAT 1
 597 #define VAX_FLOAT_FORMAT 2
 598 #define IBM_FLOAT_FORMAT 3
 599 #define C4X_FLOAT_FORMAT 4
 600
 601 /* Default to IEEE float if not specified.  Nearly all machines use it.  */
 602 #ifndef TARGET_FLOAT_FORMAT
 603 #define TARGET_FLOAT_FORMAT     IEEE_FLOAT_FORMAT
 604 #endif
 605
 606 /* Some macros can be defined by the backend in either a mode-dependent
 607    or mode-independent form.  The compiler proper should only use the
 608    mode-dependent form, providing VOIDmode when the mode is unknown.
 609    We can't poison the macros because the backend may reference them.  */
 610
 611 #ifndef REGNO_MODE_OK_FOR_BASE_P
 612 #define REGNO_MODE_OK_FOR_BASE_P(REGNO, MODE) REGNO_OK_FOR_BASE_P (REGNO)
 613 #endif
 614
 615 #ifndef REG_MODE_OK_FOR_BASE_P
 616 #define REG_MODE_OK_FOR_BASE_P(REG, MODE) REG_OK_FOR_BASE_P (REG)
 617 #endif
 618
 619 /* Determine the register class for registers suitable to be the base
 620    address register in a MEM.  Allow the choice to be dependent upon
 621    the mode of the memory access.  */
 622 #ifndef MODE_BASE_REG_CLASS
 623 #define MODE_BASE_REG_CLASS(MODE) BASE_REG_CLASS
 624 #endif
 625
 626 /* Some machines require a different base register class if the index
 627    is a register.  By default, assume that a base register is acceptable.  */
 628 #ifndef MODE_BASE_REG_REG_CLASS
 629 #define MODE_BASE_REG_REG_CLASS(MODE) MODE_BASE_REG_CLASS(MODE)
 630 #endif
 631
 632 #ifndef REGNO_MODE_OK_FOR_REG_BASE_P
 633 #define REGNO_MODE_OK_FOR_REG_BASE_P(REGNO, MODE) REGNO_MODE_OK_FOR_BASE_P (REGNO, MODE)
 634 #endif
 635
 636 #ifndef REG_MODE_OK_FOR_REG_BASE_P
 637 #define REG_MODE_OK_FOR_REG_BASE_P(REGNO, MODE) REG_MODE_OK_FOR_BASE_P (REGNO, MODE)
 638 #endif
 639
 640 #ifndef LARGEST_EXPONENT_IS_NORMAL
 641 #define LARGEST_EXPONENT_IS_NORMAL(SIZE) 0
 642 #endif
 643
 644 #ifndef ROUND_TOWARDS_ZERO
 645 #define ROUND_TOWARDS_ZERO 0
 646 #endif
 647
 648 #ifndef MODE_HAS_NANS
 649 #define MODE_HAS_NANS(MODE)                                     \
 650   (FLOAT_MODE_P (MODE)                                          \
 651    && TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT                  \
 652    && !LARGEST_EXPONENT_IS_NORMAL (GET_MODE_BITSIZE (MODE)))
 653 #endif
 654
 655 #ifndef MODE_HAS_INFINITIES
 656 #define MODE_HAS_INFINITIES(MODE)                               \
 657   (FLOAT_MODE_P (MODE)                                          \
 658    && TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT                  \
 659    && !LARGEST_EXPONENT_IS_NORMAL (GET_MODE_BITSIZE (MODE)))
 660 #endif
 661
 662 #ifndef MODE_HAS_SIGNED_ZEROS
 663 #define MODE_HAS_SIGNED_ZEROS(MODE) \
 664   (FLOAT_MODE_P (MODE) && TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT)
 665 #endif
 666
 667 #ifndef MODE_HAS_SIGN_DEPENDENT_ROUNDING
 668 #define MODE_HAS_SIGN_DEPENDENT_ROUNDING(MODE)                  \
 669   (FLOAT_MODE_P (MODE)                                          \
 670    && TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT                  \
 671    && !ROUND_TOWARDS_ZERO)
 672 #endif
 673
 674 #ifndef FLOAT_LIB_COMPARE_RETURNS_BOOL
 675 #define FLOAT_LIB_COMPARE_RETURNS_BOOL(MODE, COMPARISON) false
 676 #endif
 677
 678 /* True if the targets integer-comparison functions return { 0, 1, 2
 679    } to indicate { <, ==, > }.  False if { -1, 0, 1 } is used
 680    instead.  The libgcc routines are biased.  */
 681 #ifndef TARGET_LIB_INT_CMP_BIASED
 682 #define TARGET_LIB_INT_CMP_BIASED (true)
 683 #endif
 684
 685 /* If FLOAT_WORDS_BIG_ENDIAN is not defined in the header files,
 686    then the word-endianness is the same as for integers.  */
 687 #ifndef FLOAT_WORDS_BIG_ENDIAN
 688 #define FLOAT_WORDS_BIG_ENDIAN WORDS_BIG_ENDIAN
 689 #endif
 690
 691 #ifndef TARGET_FLT_EVAL_METHOD
 692 #define TARGET_FLT_EVAL_METHOD 0
 693 #endif
 694
 695 #ifndef HOT_TEXT_SECTION_NAME
 696 #define HOT_TEXT_SECTION_NAME ".text.hot"
 697 #endif
 698
 699 #ifndef UNLIKELY_EXECUTED_TEXT_SECTION_NAME
 700 #define UNLIKELY_EXECUTED_TEXT_SECTION_NAME ".text.unlikely"
 701 #endif
 702
 703 #ifndef HAS_LONG_COND_BRANCH
 704 #define HAS_LONG_COND_BRANCH 0
 705 #endif
 706
 707 #ifndef HAS_LONG_UNCOND_BRANCH
 708 #define HAS_LONG_UNCOND_BRANCH 0
 709 #endif
 710
 711 #ifndef UNITS_PER_SIMD_WORD
 712 #define UNITS_PER_SIMD_WORD 0
 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 /* Determine whether extra constraint letter should be handled
 722    via address reload (like 'o').  */
 723 #ifndef EXTRA_MEMORY_CONSTRAINT
 724 #define EXTRA_MEMORY_CONSTRAINT(C,STR) 0
 725 #endif
 726
 727 /* Determine whether extra constraint letter should be handled
 728    as an address (like 'p').  */
 729 #ifndef EXTRA_ADDRESS_CONSTRAINT
 730 #define EXTRA_ADDRESS_CONSTRAINT(C,STR) 0
 731 #endif
 732
 733 /* When a port defines CONSTRAINT_LEN, it should use DEFAULT_CONSTRAINT_LEN
 734    for all the characters that it does not want to change, so things like the
 735   'length' of a digit in a matching constraint is an implementation detail,
 736    and not part of the interface.  */
 737 #define DEFAULT_CONSTRAINT_LEN(C,STR) 1
 738
 739 #ifndef CONSTRAINT_LEN
 740 #define CONSTRAINT_LEN(C,STR) DEFAULT_CONSTRAINT_LEN (C, STR)
 741 #endif
 742
 743 #if defined (CONST_OK_FOR_LETTER_P) && ! defined (CONST_OK_FOR_CONSTRAINT_P)
 744 #define CONST_OK_FOR_CONSTRAINT_P(VAL,C,STR) CONST_OK_FOR_LETTER_P (VAL, C)
 745 #endif
 746
 747 #if defined (CONST_DOUBLE_OK_FOR_LETTER_P) && ! defined (CONST_DOUBLE_OK_FOR_CONSTRAINT_P)
 748 #define CONST_DOUBLE_OK_FOR_CONSTRAINT_P(OP,C,STR) \
 749   CONST_DOUBLE_OK_FOR_LETTER_P (OP, C)
 750 #endif
 751
 752 #ifndef REG_CLASS_FROM_CONSTRAINT
 753 #define REG_CLASS_FROM_CONSTRAINT(C,STR) REG_CLASS_FROM_LETTER (C)
 754 #endif
 755
 756 #if defined (EXTRA_CONSTRAINT) && ! defined (EXTRA_CONSTRAINT_STR)
 757 #define EXTRA_CONSTRAINT_STR(OP, C,STR) EXTRA_CONSTRAINT (OP, C)
 758 #endif
 759
 760 #ifndef REGISTER_MOVE_COST
 761 #define REGISTER_MOVE_COST(m, x, y) 2
 762 #endif
 763
 764 /* Determine whether the the entire c99 runtime
 765    is present in the runtime library.  */
 766 #ifndef TARGET_C99_FUNCTIONS
 767 #define TARGET_C99_FUNCTIONS 0
 768 #endif
 769
 770 /* Indicate that CLZ and CTZ are undefined at zero.  */
 771 #ifndef CLZ_DEFINED_VALUE_AT_ZERO
 772 #define CLZ_DEFINED_VALUE_AT_ZERO(MODE, VALUE)  0
 773 #endif
 774 #ifndef CTZ_DEFINED_VALUE_AT_ZERO
 775 #define CTZ_DEFINED_VALUE_AT_ZERO(MODE, VALUE)  0
 776 #endif
 777
 778 /* Provide a default value for STORE_FLAG_VALUE.  */
 779 #ifndef STORE_FLAG_VALUE
 780 #define STORE_FLAG_VALUE  1
 781 #endif
 782
 783 /* This macro is used to determine what the largest unit size that
 784    move_by_pieces can use is.  */
 785
 786 /* MOVE_MAX_PIECES is the number of bytes at a time which we can
 787    move efficiently, as opposed to  MOVE_MAX which is the maximum
 788    number of bytes we can move with a single instruction.  */
 789
 790 #ifndef MOVE_MAX_PIECES
 791 #define MOVE_MAX_PIECES   MOVE_MAX
 792 #endif
 793
 794 #ifndef STACK_POINTER_OFFSET
 795 #define STACK_POINTER_OFFSET    0
 796 #endif
 797
 798 #ifndef LOCAL_REGNO
 799 #define LOCAL_REGNO(REGNO)  0
 800 #endif
 801
 802 /* EXIT_IGNORE_STACK should be nonzero if, when returning from a function,
 803    the stack pointer does not matter.  The value is tested only in
 804    functions that have frame pointers.  */
 805 #ifndef EXIT_IGNORE_STACK
 806 #define EXIT_IGNORE_STACK 0
 807 #endif
 808
 809 /* Assume that case vectors are not pc-relative.  */
 810 #ifndef CASE_VECTOR_PC_RELATIVE
 811 #define CASE_VECTOR_PC_RELATIVE 0
 812 #endif
 813
 814 /* Assume that trampolines need function alignment.  */
 815 #ifndef TRAMPOLINE_ALIGNMENT
 816 #define TRAMPOLINE_ALIGNMENT FUNCTION_BOUNDARY
 817 #endif
 818
 819 /* Register mappings for target machines without register windows.  */
 820 #ifndef INCOMING_REGNO
 821 #define INCOMING_REGNO(N) (N)
 822 #endif
 823
 824 #ifndef OUTGOING_REGNO
 825 #define OUTGOING_REGNO(N) (N)
 826 #endif
 827
 828 #ifndef SHIFT_COUNT_TRUNCATED
 829 #define SHIFT_COUNT_TRUNCATED 0
 830 #endif
 831
 832 #ifndef LEGITIMIZE_ADDRESS
 833 #define LEGITIMIZE_ADDRESS(X, OLDX, MODE, WIN)
 834 #endif
 835
 836 #ifndef LEGITIMATE_PIC_OPERAND_P
 837 #define LEGITIMATE_PIC_OPERAND_P(X) 1
 838 #endif
 839
 840 #ifndef REVERSIBLE_CC_MODE
 841 #define REVERSIBLE_CC_MODE(MODE) 0
 842 #endif
 843
 844 /* Biggest alignment supported by the object file format of this machine.  */
 845 #ifndef MAX_OFILE_ALIGNMENT
 846 #define MAX_OFILE_ALIGNMENT BIGGEST_ALIGNMENT
 847 #endif
 848
 849 #endif  /* ! GCC_DEFAULTS_H */