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, 59 Temple Place - Suite 330, Boston, MA
  22 02111-1307, 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 /* This is how to output an element of a case-vector that is absolute.
  65    Some targets don't use this, but we have to define it anyway.  */
  66
  67 #ifndef ASM_OUTPUT_ADDR_VEC_ELT
  68 #define ASM_OUTPUT_ADDR_VEC_ELT(FILE, VALUE)  \
  69 do { fputs (integer_asm_op (POINTER_SIZE / BITS_PER_UNIT, TRUE), FILE); \
  70      (*targetm.asm_out.internal_label) (FILE, "L", (VALUE));                    \
  71      fputc ('\n', FILE);                                                \
  72    } while (0)
  73 #endif
  74
  75 /* Choose a reasonable default for ASM_OUTPUT_ASCII.  */
  76
  77 #ifndef ASM_OUTPUT_ASCII
  78 #define ASM_OUTPUT_ASCII(MYFILE, MYSTRING, MYLENGTH) \
  79   do {                                                                        \
  80     FILE *_hide_asm_out_file = (MYFILE);                                      \
  81     const unsigned char *_hide_p = (const unsigned char *) (MYSTRING);        \
  82     int _hide_thissize = (MYLENGTH);                                          \
  83     {                                                                         \
  84       FILE *asm_out_file = _hide_asm_out_file;                                \
  85       const unsigned char *p = _hide_p;                                       \
  86       int thissize = _hide_thissize;                                          \
  87       int i;                                                                  \
  88       fprintf (asm_out_file, "\t.ascii \"");                                  \
  89                                                                               \
  90       for (i = 0; i < thissize; i++)                                          \
  91         {                                                                     \
  92           int c = p[i];                                                       \
  93           if (c == '\"' || c == '\\')                                         \
  94             putc ('\\', asm_out_file);                                        \
  95           if (ISPRINT(c))                                                     \
  96             putc (c, asm_out_file);                                           \
  97           else                                                                \
  98             {                                                                 \
  99               fprintf (asm_out_file, "\\%o", c);                              \
 100               /* After an octal-escape, if a digit follows,                   \
 101                  terminate one string constant and start another.             \
 102                  The VAX assembler fails to stop reading the escape           \
 103                  after three digits, so this is the only way we               \
 104                  can get it to parse the data properly.  */                   \
 105               if (i < thissize - 1 && ISDIGIT(p[i + 1]))                      \
 106                 fprintf (asm_out_file, "\"\n\t.ascii \"");                    \
 107           }                                                                   \
 108         }                                                                     \
 109       fprintf (asm_out_file, "\"\n");                                         \
 110     }                                                                         \
 111   }                                                                           \
 112   while (0)
 113 #endif
 114
 115 /* This is how we tell the assembler to equate two values.  */
 116 #ifdef SET_ASM_OP
 117 #ifndef ASM_OUTPUT_DEF
 118 #define ASM_OUTPUT_DEF(FILE,LABEL1,LABEL2)                              \
 119  do {   fprintf ((FILE), "%s", SET_ASM_OP);                             \
 120         assemble_name (FILE, LABEL1);                                   \
 121         fprintf (FILE, ",");                                            \
 122         assemble_name (FILE, LABEL2);                                   \
 123         fprintf (FILE, "\n");                                           \
 124   } while (0)
 125 #endif
 126 #endif
 127
 128 /* Decide whether to defer emitting the assembler output for an equate
 129    of two values.  The default is to not defer output.  */
 130 #ifndef TARGET_DEFERRED_OUTPUT_DEFS
 131 #define TARGET_DEFERRED_OUTPUT_DEFS(DECL,TARGET) false
 132 #endif
 133
 134 /* This is how to output the definition of a user-level label named
 135    NAME, such as the label on a static function or variable NAME.  */
 136
 137 #ifndef ASM_OUTPUT_LABEL
 138 #define ASM_OUTPUT_LABEL(FILE,NAME) \
 139   do { assemble_name ((FILE), (NAME)); fputs (":\n", (FILE)); } while (0)
 140 #endif
 141
 142 /* Output the definition of a compiler-generated label named NAME.  */
 143 #ifndef ASM_OUTPUT_INTERNAL_LABEL
 144 #define ASM_OUTPUT_INTERNAL_LABEL(FILE,NAME)    \
 145   do {                                          \
 146     assemble_name_raw ((FILE), (NAME));         \
 147     fputs (":\n", (FILE));                      \
 148   } while (0)
 149 #endif
 150
 151 /* This is how to output a reference to a user-level label named NAME.  */
 152
 153 #ifndef ASM_OUTPUT_LABELREF
 154 #define ASM_OUTPUT_LABELREF(FILE,NAME)  asm_fprintf ((FILE), "%U%s", (NAME))
 155 #endif
 156
 157 /* Allow target to print debug info labels specially.  This is useful for
 158    VLIW targets, since debug info labels should go into the middle of
 159    instruction bundles instead of breaking them.  */
 160
 161 #ifndef ASM_OUTPUT_DEBUG_LABEL
 162 #define ASM_OUTPUT_DEBUG_LABEL(FILE, PREFIX, NUM) \
 163   (*targetm.asm_out.internal_label) (FILE, PREFIX, NUM)
 164 #endif
 165
 166 /* This is how we tell the assembler that a symbol is weak.  */
 167 #ifndef ASM_OUTPUT_WEAK_ALIAS
 168 #if defined (ASM_WEAKEN_LABEL) && defined (ASM_OUTPUT_DEF)
 169 #define ASM_OUTPUT_WEAK_ALIAS(STREAM, NAME, VALUE)      \
 170   do                                                    \
 171     {                                                   \
 172       ASM_WEAKEN_LABEL (STREAM, NAME);                  \
 173       if (VALUE)                                        \
 174         ASM_OUTPUT_DEF (STREAM, NAME, VALUE);           \
 175     }                                                   \
 176   while (0)
 177 #endif
 178 #endif
 179
 180 /* How to emit a .type directive.  */
 181 #ifndef ASM_OUTPUT_TYPE_DIRECTIVE
 182 #if defined TYPE_ASM_OP && defined TYPE_OPERAND_FMT
 183 #define ASM_OUTPUT_TYPE_DIRECTIVE(STREAM, NAME, TYPE)   \
 184   do                                                    \
 185     {                                                   \
 186       fputs (TYPE_ASM_OP, STREAM);                      \
 187       assemble_name (STREAM, NAME);                     \
 188       fputs (", ", STREAM);                             \
 189       fprintf (STREAM, TYPE_OPERAND_FMT, TYPE);         \
 190       putc ('\n', STREAM);                              \
 191     }                                                   \
 192   while (0)
 193 #endif
 194 #endif
 195
 196 /* How to emit a .size directive.  */
 197 #ifndef ASM_OUTPUT_SIZE_DIRECTIVE
 198 #ifdef SIZE_ASM_OP
 199 #define ASM_OUTPUT_SIZE_DIRECTIVE(STREAM, NAME, SIZE)   \
 200   do                                                    \
 201     {                                                   \
 202       HOST_WIDE_INT size_ = (SIZE);                     \
 203       fputs (SIZE_ASM_OP, STREAM);                      \
 204       assemble_name (STREAM, NAME);                     \
 205       fprintf (STREAM, ", " HOST_WIDE_INT_PRINT_DEC "\n", size_); \
 206     }                                                   \
 207   while (0)
 208
 209 #define ASM_OUTPUT_MEASURED_SIZE(STREAM, NAME)          \
 210   do                                                    \
 211     {                                                   \
 212       fputs (SIZE_ASM_OP, STREAM);                      \
 213       assemble_name (STREAM, NAME);                     \
 214       fputs (", .-", STREAM);                           \
 215       assemble_name (STREAM, NAME);                     \
 216       putc ('\n', STREAM);                              \
 217     }                                                   \
 218   while (0)
 219
 220 #endif
 221 #endif
 222
 223 /* This determines whether or not we support weak symbols.  */
 224 #ifndef SUPPORTS_WEAK
 225 #if defined (ASM_WEAKEN_LABEL) || defined (ASM_WEAKEN_DECL)
 226 #define SUPPORTS_WEAK 1
 227 #else
 228 #define SUPPORTS_WEAK 0
 229 #endif
 230 #endif
 231
 232 /* This determines whether or not we support link-once semantics.  */
 233 #ifndef SUPPORTS_ONE_ONLY
 234 #ifdef MAKE_DECL_ONE_ONLY
 235 #define SUPPORTS_ONE_ONLY 1
 236 #else
 237 #define SUPPORTS_ONE_ONLY 0
 238 #endif
 239 #endif
 240
 241 /* This determines whether weak symbols must be left out of a static
 242    archive's table of contents.  Defining this macro to be nonzero has
 243    the consequence that certain symbols will not be made weak that
 244    otherwise would be.  The C++ ABI requires this macro to be zero;
 245    see the documentation.  */
 246 #ifndef TARGET_WEAK_NOT_IN_ARCHIVE_TOC
 247 #define TARGET_WEAK_NOT_IN_ARCHIVE_TOC 0
 248 #endif
 249
 250 /* This determines whether or not we need linkonce unwind information.  */
 251 #ifndef TARGET_USES_WEAK_UNWIND_INFO
 252 #define TARGET_USES_WEAK_UNWIND_INFO 0
 253 #endif
 254
 255 /* By default, there is no prefix on user-defined symbols.  */
 256 #ifndef USER_LABEL_PREFIX
 257 #define USER_LABEL_PREFIX ""
 258 #endif
 259
 260 /* If the target supports weak symbols, define TARGET_ATTRIBUTE_WEAK to
 261    provide a weak attribute.  Else define it to nothing.
 262
 263    This would normally belong in ansidecl.h, but SUPPORTS_WEAK is
 264    not available at that time.
 265
 266    Note, this is only for use by target files which we know are to be
 267    compiled by GCC.  */
 268 #ifndef TARGET_ATTRIBUTE_WEAK
 269 # if SUPPORTS_WEAK
 270 #  define TARGET_ATTRIBUTE_WEAK __attribute__ ((weak))
 271 # else
 272 #  define TARGET_ATTRIBUTE_WEAK
 273 # endif
 274 #endif
 275
 276 /* Determines whether we may use common symbols to represent one-only
 277    semantics (a.k.a. "vague linkage").  */
 278 #ifndef USE_COMMON_FOR_ONE_ONLY
 279 # define USE_COMMON_FOR_ONE_ONLY 1
 280 #endif
 281
 282 /* By default we can assume that all global symbols are in one namespace,
 283    across all shared libraries.  */
 284 #ifndef MULTIPLE_SYMBOL_SPACES
 285 # define MULTIPLE_SYMBOL_SPACES 0
 286 #endif
 287
 288 /* If the target supports init_priority C++ attribute, give
 289    SUPPORTS_INIT_PRIORITY a nonzero value.  */
 290 #ifndef SUPPORTS_INIT_PRIORITY
 291 #define SUPPORTS_INIT_PRIORITY 1
 292 #endif /* SUPPORTS_INIT_PRIORITY */
 293
 294 /* If duplicate library search directories can be removed from a
 295    linker command without changing the linker's semantics, give this
 296    symbol a nonzero.  */
 297 #ifndef LINK_ELIMINATE_DUPLICATE_LDIRECTORIES
 298 #define LINK_ELIMINATE_DUPLICATE_LDIRECTORIES 0
 299 #endif /* LINK_ELIMINATE_DUPLICATE_LDIRECTORIES */
 300
 301 /* If we have a definition of INCOMING_RETURN_ADDR_RTX, assume that
 302    the rest of the DWARF 2 frame unwind support is also provided.  */
 303 #if !defined (DWARF2_UNWIND_INFO) && defined (INCOMING_RETURN_ADDR_RTX)
 304 #define DWARF2_UNWIND_INFO 1
 305 #endif
 306
 307 /* If we have named sections, and we're using crtstuff to run ctors,
 308    use them for registering eh frame information.  */
 309 #if defined (TARGET_ASM_NAMED_SECTION) && DWARF2_UNWIND_INFO \
 310     && !defined(EH_FRAME_IN_DATA_SECTION)
 311 #ifndef EH_FRAME_SECTION_NAME
 312 #define EH_FRAME_SECTION_NAME ".eh_frame"
 313 #endif
 314 #endif
 315
 316 /* On many systems, different EH table encodings are used under
 317    difference circumstances.  Some will require runtime relocations;
 318    some will not.  For those that do not require runtime relocations,
 319    we would like to make the table read-only.  However, since the
 320    read-only tables may need to be combined with read-write tables
 321    that do require runtime relocation, it is not safe to make the
 322    tables read-only unless the linker will merge read-only and
 323    read-write sections into a single read-write section.  If your
 324    linker does not have this ability, but your system is such that no
 325    encoding used with non-PIC code will ever require a runtime
 326    relocation, then you can define EH_TABLES_CAN_BE_READ_ONLY to 1 in
 327    your target configuration file.  */
 328 #ifndef EH_TABLES_CAN_BE_READ_ONLY
 329 #ifdef HAVE_LD_RO_RW_SECTION_MIXING
 330 #define EH_TABLES_CAN_BE_READ_ONLY 1
 331 #else
 332 #define EH_TABLES_CAN_BE_READ_ONLY 0
 333 #endif
 334 #endif
 335
 336 /* If we have named section and we support weak symbols, then use the
 337    .jcr section for recording java classes which need to be registered
 338    at program start-up time.  */
 339 #if defined (TARGET_ASM_NAMED_SECTION) && SUPPORTS_WEAK
 340 #ifndef JCR_SECTION_NAME
 341 #define JCR_SECTION_NAME ".jcr"
 342 #endif
 343 #endif
 344
 345 /* This decision to use a .jcr section can be overridden by defining
 346    USE_JCR_SECTION to 0 in target file.  This is necessary if target
 347    can define JCR_SECTION_NAME but does not have crtstuff or
 348    linker support for .jcr section.  */
 349 #ifndef TARGET_USE_JCR_SECTION
 350 #ifdef JCR_SECTION_NAME
 351 #define TARGET_USE_JCR_SECTION 1
 352 #else
 353 #define TARGET_USE_JCR_SECTION 0
 354 #endif
 355 #endif
 356
 357 /* Number of hardware registers that go into the DWARF-2 unwind info.
 358    If not defined, equals FIRST_PSEUDO_REGISTER  */
 359
 360 #ifndef DWARF_FRAME_REGISTERS
 361 #define DWARF_FRAME_REGISTERS FIRST_PSEUDO_REGISTER
 362 #endif
 363
 364 /* How to renumber registers for dbx and gdb.  If not defined, assume
 365    no renumbering is necessary.  */
 366
 367 #ifndef DBX_REGISTER_NUMBER
 368 #define DBX_REGISTER_NUMBER(REGNO) (REGNO)
 369 #endif
 370
 371 /* Default sizes for base C types.  If the sizes are different for
 372    your target, you should override these values by defining the
 373    appropriate symbols in your tm.h file.  */
 374
 375 #ifndef BITS_PER_UNIT
 376 #define BITS_PER_UNIT 8
 377 #endif
 378
 379 #ifndef BITS_PER_WORD
 380 #define BITS_PER_WORD (BITS_PER_UNIT * UNITS_PER_WORD)
 381 #endif
 382
 383 #ifndef CHAR_TYPE_SIZE
 384 #define CHAR_TYPE_SIZE BITS_PER_UNIT
 385 #endif
 386
 387 #ifndef BOOL_TYPE_SIZE
 388 /* `bool' has size and alignment `1', on almost all platforms.  */
 389 #define BOOL_TYPE_SIZE CHAR_TYPE_SIZE
 390 #endif
 391
 392 #ifndef SHORT_TYPE_SIZE
 393 #define SHORT_TYPE_SIZE (BITS_PER_UNIT * MIN ((UNITS_PER_WORD + 1) / 2, 2))
 394 #endif
 395
 396 #ifndef INT_TYPE_SIZE
 397 #define INT_TYPE_SIZE BITS_PER_WORD
 398 #endif
 399
 400 #ifndef LONG_TYPE_SIZE
 401 #define LONG_TYPE_SIZE BITS_PER_WORD
 402 #endif
 403
 404 #ifndef LONG_LONG_TYPE_SIZE
 405 #define LONG_LONG_TYPE_SIZE (BITS_PER_WORD * 2)
 406 #endif
 407
 408 #ifndef WCHAR_TYPE_SIZE
 409 #define WCHAR_TYPE_SIZE INT_TYPE_SIZE
 410 #endif
 411
 412 #ifndef FLOAT_TYPE_SIZE
 413 #define FLOAT_TYPE_SIZE BITS_PER_WORD
 414 #endif
 415
 416 #ifndef DOUBLE_TYPE_SIZE
 417 #define DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
 418 #endif
 419
 420 #ifndef LONG_DOUBLE_TYPE_SIZE
 421 #define LONG_DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
 422 #endif
 423
 424 /* Width in bits of a pointer.  Mind the value of the macro `Pmode'.  */
 425 #ifndef POINTER_SIZE
 426 #define POINTER_SIZE BITS_PER_WORD
 427 #endif
 428
 429 #ifndef PIC_OFFSET_TABLE_REGNUM
 430 #define PIC_OFFSET_TABLE_REGNUM INVALID_REGNUM
 431 #endif
 432
 433 #ifndef TARGET_DLLIMPORT_DECL_ATTRIBUTES
 434 #define TARGET_DLLIMPORT_DECL_ATTRIBUTES 0
 435 #endif
 436
 437 #ifndef TARGET_DECLSPEC
 438 #if TARGET_DLLIMPORT_DECL_ATTRIBUTES
 439 /* If the target supports the "dllimport" attribute, users are
 440    probably used to the "__declspec" syntax.  */
 441 #define TARGET_DECLSPEC 1
 442 #else
 443 #define TARGET_DECLSPEC 0
 444 #endif
 445 #endif
 446
 447 /* By default, the preprocessor should be invoked the same way in C++
 448    as in C.  */
 449 #ifndef CPLUSPLUS_CPP_SPEC
 450 #ifdef CPP_SPEC
 451 #define CPLUSPLUS_CPP_SPEC CPP_SPEC
 452 #endif
 453 #endif
 454
 455 #ifndef ACCUMULATE_OUTGOING_ARGS
 456 #define ACCUMULATE_OUTGOING_ARGS 0
 457 #endif
 458
 459 /* Supply a default definition for PUSH_ARGS.  */
 460 #ifndef PUSH_ARGS
 461 #ifdef PUSH_ROUNDING
 462 #define PUSH_ARGS       !ACCUMULATE_OUTGOING_ARGS
 463 #else
 464 #define PUSH_ARGS       0
 465 #endif
 466 #endif
 467
 468 /* Decide whether a function's arguments should be processed
 469    from first to last or from last to first.
 470
 471    They should if the stack and args grow in opposite directions, but
 472    only if we have push insns.  */
 473
 474 #ifdef PUSH_ROUNDING
 475
 476 #ifndef PUSH_ARGS_REVERSED
 477 #if defined (STACK_GROWS_DOWNWARD) != defined (ARGS_GROW_DOWNWARD)
 478 #define PUSH_ARGS_REVERSED  PUSH_ARGS
 479 #endif
 480 #endif
 481
 482 #endif
 483
 484 #ifndef PUSH_ARGS_REVERSED
 485 #define PUSH_ARGS_REVERSED 0
 486 #endif
 487
 488 /* If PREFERRED_STACK_BOUNDARY is not defined, set it to STACK_BOUNDARY.
 489    STACK_BOUNDARY is required.  */
 490 #ifndef PREFERRED_STACK_BOUNDARY
 491 #define PREFERRED_STACK_BOUNDARY STACK_BOUNDARY
 492 #endif
 493
 494 #ifndef TARGET_DEFAULT_PACK_STRUCT
 495 #define TARGET_DEFAULT_PACK_STRUCT 0
 496 #endif
 497
 498 /* By default, the C++ compiler will use function addresses in the
 499    vtable entries.  Setting this nonzero tells the compiler to use
 500    function descriptors instead.  The value of this macro says how
 501    many words wide the descriptor is (normally 2).  It is assumed
 502    that the address of a function descriptor may be treated as a
 503    pointer to a function.  */
 504 #ifndef TARGET_VTABLE_USES_DESCRIPTORS
 505 #define TARGET_VTABLE_USES_DESCRIPTORS 0
 506 #endif
 507
 508 /* By default, the vtable entries are void pointers, the so the alignment
 509    is the same as pointer alignment.  The value of this macro specifies
 510    the alignment of the vtable entry in bits.  It should be defined only
 511    when special alignment is necessary.  */
 512 #ifndef TARGET_VTABLE_ENTRY_ALIGN
 513 #define TARGET_VTABLE_ENTRY_ALIGN POINTER_SIZE
 514 #endif
 515
 516 /* There are a few non-descriptor entries in the vtable at offsets below
 517    zero.  If these entries must be padded (say, to preserve the alignment
 518    specified by TARGET_VTABLE_ENTRY_ALIGN), set this to the number of
 519    words in each data entry.  */
 520 #ifndef TARGET_VTABLE_DATA_ENTRY_DISTANCE
 521 #define TARGET_VTABLE_DATA_ENTRY_DISTANCE 1
 522 #endif
 523
 524 /* Decide whether it is safe to use a local alias for a virtual function
 525    when constructing thunks.  */
 526 #ifndef TARGET_USE_LOCAL_THUNK_ALIAS_P
 527 #ifdef ASM_OUTPUT_DEF
 528 #define TARGET_USE_LOCAL_THUNK_ALIAS_P(DECL) 1
 529 #else
 530 #define TARGET_USE_LOCAL_THUNK_ALIAS_P(DECL) 0
 531 #endif
 532 #endif
 533
 534 /* Select a format to encode pointers in exception handling data.  We
 535    prefer those that result in fewer dynamic relocations.  Assume no
 536    special support here and encode direct references.  */
 537 #ifndef ASM_PREFERRED_EH_DATA_FORMAT
 538 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE,GLOBAL)  DW_EH_PE_absptr
 539 #endif
 540
 541 /* By default, the C++ compiler will use the lowest bit of the pointer
 542    to function to indicate a pointer-to-member-function points to a
 543    virtual member function.  However, if FUNCTION_BOUNDARY indicates
 544    function addresses aren't always even, the lowest bit of the delta
 545    field will be used.  */
 546 #ifndef TARGET_PTRMEMFUNC_VBIT_LOCATION
 547 #define TARGET_PTRMEMFUNC_VBIT_LOCATION \
 548   (FUNCTION_BOUNDARY >= 2 * BITS_PER_UNIT \
 549    ? ptrmemfunc_vbit_in_pfn : ptrmemfunc_vbit_in_delta)
 550 #endif
 551
 552 #ifndef DEFAULT_GDB_EXTENSIONS
 553 #define DEFAULT_GDB_EXTENSIONS 1
 554 #endif
 555
 556 /* If more than one debugging type is supported, you must define
 557    PREFERRED_DEBUGGING_TYPE to choose the default.  */
 558
 559 #if 1 < (defined (DBX_DEBUGGING_INFO) + defined (SDB_DEBUGGING_INFO) \
 560          + defined (DWARF2_DEBUGGING_INFO) + defined (XCOFF_DEBUGGING_INFO) \
 561          + defined (VMS_DEBUGGING_INFO))
 562 #ifndef PREFERRED_DEBUGGING_TYPE
 563 #error You must define PREFERRED_DEBUGGING_TYPE
 564 #endif /* no PREFERRED_DEBUGGING_TYPE */
 565
 566 /* If only one debugging format is supported, define PREFERRED_DEBUGGING_TYPE
 567    here so other code needn't care.  */
 568 #elif defined DBX_DEBUGGING_INFO
 569 #define PREFERRED_DEBUGGING_TYPE DBX_DEBUG
 570
 571 #elif defined SDB_DEBUGGING_INFO
 572 #define PREFERRED_DEBUGGING_TYPE SDB_DEBUG
 573
 574 #elif defined DWARF2_DEBUGGING_INFO
 575 #define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
 576
 577 #elif defined VMS_DEBUGGING_INFO
 578 #define PREFERRED_DEBUGGING_TYPE VMS_AND_DWARF2_DEBUG
 579
 580 #elif defined XCOFF_DEBUGGING_INFO
 581 #define PREFERRED_DEBUGGING_TYPE XCOFF_DEBUG
 582
 583 #else
 584 /* No debugging format is supported by this target.  */
 585 #define PREFERRED_DEBUGGING_TYPE NO_DEBUG
 586 #endif
 587
 588 /* Define codes for all the float formats that we know of.  */
 589 #define UNKNOWN_FLOAT_FORMAT 0
 590 #define IEEE_FLOAT_FORMAT 1
 591 #define VAX_FLOAT_FORMAT 2
 592 #define IBM_FLOAT_FORMAT 3
 593 #define C4X_FLOAT_FORMAT 4
 594
 595 /* Default to IEEE float if not specified.  Nearly all machines use it.  */
 596 #ifndef TARGET_FLOAT_FORMAT
 597 #define TARGET_FLOAT_FORMAT     IEEE_FLOAT_FORMAT
 598 #endif
 599
 600 /* Some macros can be defined by the backend in either a mode-dependent
 601    or mode-independent form.  The compiler proper should only use the
 602    mode-dependent form, providing VOIDmode when the mode is unknown.
 603    We can't poison the macros because the backend may reference them.  */
 604
 605 #ifndef REGNO_MODE_OK_FOR_BASE_P
 606 #define REGNO_MODE_OK_FOR_BASE_P(REGNO, MODE) REGNO_OK_FOR_BASE_P (REGNO)
 607 #endif
 608
 609 #ifndef REG_MODE_OK_FOR_BASE_P
 610 #define REG_MODE_OK_FOR_BASE_P(REG, MODE) REG_OK_FOR_BASE_P (REG)
 611 #endif
 612
 613 /* Determine the register class for registers suitable to be the base
 614    address register in a MEM.  Allow the choice to be dependent upon
 615    the mode of the memory access.  */
 616 #ifndef MODE_BASE_REG_CLASS
 617 #define MODE_BASE_REG_CLASS(MODE) BASE_REG_CLASS
 618 #endif
 619
 620 /* Some machines require a different base register class if the index
 621    is a register.  By default, assume that a base register is acceptable.  */
 622 #ifndef MODE_BASE_REG_REG_CLASS
 623 #define MODE_BASE_REG_REG_CLASS(MODE) MODE_BASE_REG_CLASS(MODE)
 624 #endif
 625
 626 #ifndef REGNO_MODE_OK_FOR_REG_BASE_P
 627 #define REGNO_MODE_OK_FOR_REG_BASE_P(REGNO, MODE) REGNO_MODE_OK_FOR_BASE_P (REGNO, MODE)
 628 #endif
 629
 630 #ifndef REG_MODE_OK_FOR_REG_BASE_P
 631 #define REG_MODE_OK_FOR_REG_BASE_P(REGNO, MODE) REG_MODE_OK_FOR_BASE_P (REGNO, MODE)
 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 HOT_TEXT_SECTION_NAME
 690 #define HOT_TEXT_SECTION_NAME ".text.hot"
 691 #endif
 692
 693 #ifndef UNLIKELY_EXECUTED_TEXT_SECTION_NAME
 694 #define UNLIKELY_EXECUTED_TEXT_SECTION_NAME ".text.unlikely"
 695 #endif
 696
 697 #ifndef HAS_LONG_COND_BRANCH
 698 #define HAS_LONG_COND_BRANCH 0
 699 #endif
 700
 701 #ifndef HAS_LONG_UNCOND_BRANCH
 702 #define HAS_LONG_UNCOND_BRANCH 0
 703 #endif
 704
 705 /* By default, only attempt to parallelize bitwise operations, and
 706    possibly adds/subtracts using bit-twiddling.  */
 707 #ifndef UNITS_PER_SIMD_WORD
 708 #define UNITS_PER_SIMD_WORD UNITS_PER_WORD
 709 #endif
 710
 711 /* Determine whether __cxa_atexit, rather than atexit, is used to
 712    register C++ destructors for local statics and global objects.  */
 713 #ifndef DEFAULT_USE_CXA_ATEXIT
 714 #define DEFAULT_USE_CXA_ATEXIT 0
 715 #endif
 716
 717 /* Determine whether extra constraint letter should be handled
 718    via address reload (like 'o').  */
 719 #ifndef EXTRA_MEMORY_CONSTRAINT
 720 #define EXTRA_MEMORY_CONSTRAINT(C,STR) 0
 721 #endif
 722
 723 /* Determine whether extra constraint letter should be handled
 724    as an address (like 'p').  */
 725 #ifndef EXTRA_ADDRESS_CONSTRAINT
 726 #define EXTRA_ADDRESS_CONSTRAINT(C,STR) 0
 727 #endif
 728
 729 /* When a port defines CONSTRAINT_LEN, it should use DEFAULT_CONSTRAINT_LEN
 730    for all the characters that it does not want to change, so things like the
 731   'length' of a digit in a matching constraint is an implementation detail,
 732    and not part of the interface.  */
 733 #define DEFAULT_CONSTRAINT_LEN(C,STR) 1
 734
 735 #ifndef CONSTRAINT_LEN
 736 #define CONSTRAINT_LEN(C,STR) DEFAULT_CONSTRAINT_LEN (C, STR)
 737 #endif
 738
 739 #if defined (CONST_OK_FOR_LETTER_P) && ! defined (CONST_OK_FOR_CONSTRAINT_P)
 740 #define CONST_OK_FOR_CONSTRAINT_P(VAL,C,STR) CONST_OK_FOR_LETTER_P (VAL, C)
 741 #endif
 742
 743 #if defined (CONST_DOUBLE_OK_FOR_LETTER_P) && ! defined (CONST_DOUBLE_OK_FOR_CONSTRAINT_P)
 744 #define CONST_DOUBLE_OK_FOR_CONSTRAINT_P(OP,C,STR) \
 745   CONST_DOUBLE_OK_FOR_LETTER_P (OP, C)
 746 #endif
 747
 748 #ifndef REG_CLASS_FROM_CONSTRAINT
 749 #define REG_CLASS_FROM_CONSTRAINT(C,STR) REG_CLASS_FROM_LETTER (C)
 750 #endif
 751
 752 #if defined (EXTRA_CONSTRAINT) && ! defined (EXTRA_CONSTRAINT_STR)
 753 #define EXTRA_CONSTRAINT_STR(OP, C,STR) EXTRA_CONSTRAINT (OP, C)
 754 #endif
 755
 756 #ifndef REGISTER_MOVE_COST
 757 #define REGISTER_MOVE_COST(m, x, y) 2
 758 #endif
 759
 760 /* Determine whether the entire c99 runtime
 761    is present in the runtime library.  */
 762 #ifndef TARGET_C99_FUNCTIONS
 763 #define TARGET_C99_FUNCTIONS 0
 764 #endif
 765
 766 /* Indicate that CLZ and CTZ are undefined at zero.  */
 767 #ifndef CLZ_DEFINED_VALUE_AT_ZERO
 768 #define CLZ_DEFINED_VALUE_AT_ZERO(MODE, VALUE)  0
 769 #endif
 770 #ifndef CTZ_DEFINED_VALUE_AT_ZERO
 771 #define CTZ_DEFINED_VALUE_AT_ZERO(MODE, VALUE)  0
 772 #endif
 773
 774 /* Provide a default value for STORE_FLAG_VALUE.  */
 775 #ifndef STORE_FLAG_VALUE
 776 #define STORE_FLAG_VALUE  1
 777 #endif
 778
 779 /* This macro is used to determine what the largest unit size that
 780    move_by_pieces can use is.  */
 781
 782 /* MOVE_MAX_PIECES is the number of bytes at a time which we can
 783    move efficiently, as opposed to  MOVE_MAX which is the maximum
 784    number of bytes we can move with a single instruction.  */
 785
 786 #ifndef MOVE_MAX_PIECES
 787 #define MOVE_MAX_PIECES   MOVE_MAX
 788 #endif
 789
 790 #ifndef STACK_POINTER_OFFSET
 791 #define STACK_POINTER_OFFSET    0
 792 #endif
 793
 794 #ifndef LOCAL_REGNO
 795 #define LOCAL_REGNO(REGNO)  0
 796 #endif
 797
 798 /* EXIT_IGNORE_STACK should be nonzero if, when returning from a function,
 799    the stack pointer does not matter.  The value is tested only in
 800    functions that have frame pointers.  */
 801 #ifndef EXIT_IGNORE_STACK
 802 #define EXIT_IGNORE_STACK 0
 803 #endif
 804
 805 /* Assume that case vectors are not pc-relative.  */
 806 #ifndef CASE_VECTOR_PC_RELATIVE
 807 #define CASE_VECTOR_PC_RELATIVE 0
 808 #endif
 809
 810 /* Assume that trampolines need function alignment.  */
 811 #ifndef TRAMPOLINE_ALIGNMENT
 812 #define TRAMPOLINE_ALIGNMENT FUNCTION_BOUNDARY
 813 #endif
 814
 815 /* Register mappings for target machines without register windows.  */
 816 #ifndef INCOMING_REGNO
 817 #define INCOMING_REGNO(N) (N)
 818 #endif
 819
 820 #ifndef OUTGOING_REGNO
 821 #define OUTGOING_REGNO(N) (N)
 822 #endif
 823
 824 #ifndef SHIFT_COUNT_TRUNCATED
 825 #define SHIFT_COUNT_TRUNCATED 0
 826 #endif
 827
 828 #ifndef LEGITIMIZE_ADDRESS
 829 #define LEGITIMIZE_ADDRESS(X, OLDX, MODE, WIN)
 830 #endif
 831
 832 #ifndef LEGITIMATE_PIC_OPERAND_P
 833 #define LEGITIMATE_PIC_OPERAND_P(X) 1
 834 #endif
 835
 836 #ifndef REVERSIBLE_CC_MODE
 837 #define REVERSIBLE_CC_MODE(MODE) 0
 838 #endif
 839
 840 /* Biggest alignment supported by the object file format of this machine.  */
 841 #ifndef MAX_OFILE_ALIGNMENT
 842 #define MAX_OFILE_ALIGNMENT BIGGEST_ALIGNMENT
 843 #endif
 844
 845 #endif  /* ! GCC_DEFAULTS_H */