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 /* Define default standard character escape sequences.  */
  40 #ifndef TARGET_BELL
  41 #  define TARGET_BELL 007
  42 #  define TARGET_BS 010
  43 #  define TARGET_CR 015
  44 #  define TARGET_DIGIT0 060
  45 #  define TARGET_ESC 033
  46 #  define TARGET_FF 014
  47 #  define TARGET_NEWLINE 012
  48 #  define TARGET_TAB 011
  49 #  define TARGET_VT 013
  50 #endif
  51
  52 /* Store in OUTPUT a string (made with alloca) containing an
  53    assembler-name for a local static variable or function named NAME.
  54    LABELNO is an integer which is different for each call.  */
  55
  56 #ifndef ASM_PN_FORMAT
  57 # ifndef NO_DOT_IN_LABEL
  58 #  define ASM_PN_FORMAT "%s.%lu"
  59 # else
  60 #  ifndef NO_DOLLAR_IN_LABEL
  61 #   define ASM_PN_FORMAT "%s$%lu"
  62 #  else
  63 #   define ASM_PN_FORMAT "__%s_%lu"
  64 #  endif
  65 # endif
  66 #endif /* ! ASM_PN_FORMAT */
  67
  68 #ifndef ASM_FORMAT_PRIVATE_NAME
  69 # define ASM_FORMAT_PRIVATE_NAME(OUTPUT, NAME, LABELNO) \
  70   do { const char *const name_ = (NAME); \
  71        char *const output_ = (OUTPUT) = \
  72          (char *) alloca (strlen (name_) + 32); \
  73        sprintf (output_, ASM_PN_FORMAT, name_, (unsigned long)(LABELNO)); \
  74   } while (0)
  75 #endif
  76
  77 /* This is how to output an element of a case-vector that is absolute.
  78    Some targets don't use this, but we have to define it anyway.  */
  79
  80 #ifndef ASM_OUTPUT_ADDR_VEC_ELT
  81 #define ASM_OUTPUT_ADDR_VEC_ELT(FILE, VALUE)  \
  82 do { fputs (integer_asm_op (POINTER_SIZE / BITS_PER_UNIT, TRUE), FILE); \
  83      (*targetm.asm_out.internal_label) (FILE, "L", (VALUE));                    \
  84      fputc ('\n', FILE);                                                \
  85    } while (0)
  86 #endif
  87
  88 /* Choose a reasonable default for ASM_OUTPUT_ASCII.  */
  89
  90 #ifndef ASM_OUTPUT_ASCII
  91 #define ASM_OUTPUT_ASCII(MYFILE, MYSTRING, MYLENGTH) \
  92   do {                                                                        \
  93     FILE *_hide_asm_out_file = (MYFILE);                                      \
  94     const unsigned char *_hide_p = (const unsigned char *) (MYSTRING);        \
  95     int _hide_thissize = (MYLENGTH);                                          \
  96     {                                                                         \
  97       FILE *asm_out_file = _hide_asm_out_file;                                \
  98       const unsigned char *p = _hide_p;                                       \
  99       int thissize = _hide_thissize;                                          \
 100       int i;                                                                  \
 101       fprintf (asm_out_file, "\t.ascii \"");                                  \
 102                                                                               \
 103       for (i = 0; i < thissize; i++)                                          \
 104         {                                                                     \
 105           int c = p[i];                                                       \
 106           if (c == '\"' || c == '\\')                                         \
 107             putc ('\\', asm_out_file);                                        \
 108           if (ISPRINT(c))                                                     \
 109             putc (c, asm_out_file);                                           \
 110           else                                                                \
 111             {                                                                 \
 112               fprintf (asm_out_file, "\\%o", c);                              \
 113               /* After an octal-escape, if a digit follows,                   \
 114                  terminate one string constant and start another.             \
 115                  The VAX assembler fails to stop reading the escape           \
 116                  after three digits, so this is the only way we               \
 117                  can get it to parse the data properly.  */                   \
 118               if (i < thissize - 1 && ISDIGIT(p[i + 1]))                      \
 119                 fprintf (asm_out_file, "\"\n\t.ascii \"");                    \
 120           }                                                                   \
 121         }                                                                     \
 122       fprintf (asm_out_file, "\"\n");                                         \
 123     }                                                                         \
 124   }                                                                           \
 125   while (0)
 126 #endif
 127
 128 /* This is how we tell the assembler to equate two values.  */
 129 #ifdef SET_ASM_OP
 130 #ifndef ASM_OUTPUT_DEF
 131 #define ASM_OUTPUT_DEF(FILE,LABEL1,LABEL2)                              \
 132  do {   fprintf ((FILE), "%s", SET_ASM_OP);                             \
 133         assemble_name (FILE, LABEL1);                                   \
 134         fprintf (FILE, ",");                                            \
 135         assemble_name (FILE, LABEL2);                                   \
 136         fprintf (FILE, "\n");                                           \
 137   } while (0)
 138 #endif
 139 #endif
 140
 141 /* Decide whether to defer emitting the assembler output for an equate
 142    of two values.  The default is to not defer output.  */
 143 #ifndef TARGET_DEFERRED_OUTPUT_DEFS
 144 #define TARGET_DEFERRED_OUTPUT_DEFS(DECL,TARGET) false
 145 #endif
 146
 147 /* This is how to output the definition of a user-level label named
 148    NAME, such as the label on a static function or variable NAME.  */
 149
 150 #ifndef ASM_OUTPUT_LABEL
 151 #define ASM_OUTPUT_LABEL(FILE,NAME) \
 152   do { assemble_name ((FILE), (NAME)); fputs (":\n", (FILE)); } while (0)
 153 #endif
 154
 155 /* Output the definition of a compiler-generated label named NAME.  */
 156 #ifndef ASM_OUTPUT_INTERNAL_LABEL
 157 #define ASM_OUTPUT_INTERNAL_LABEL(FILE,NAME)    \
 158   do {                                          \
 159     assemble_name_raw ((FILE), (NAME));         \
 160     fputs (":\n", (FILE));                      \
 161   } while (0)
 162 #endif
 163
 164 /* This is how to output a reference to a user-level label named NAME.  */
 165
 166 #ifndef ASM_OUTPUT_LABELREF
 167 #define ASM_OUTPUT_LABELREF(FILE,NAME)  asm_fprintf ((FILE), "%U%s", (NAME))
 168 #endif
 169
 170 /* Allow target to print debug info labels specially.  This is useful for
 171    VLIW targets, since debug info labels should go into the middle of
 172    instruction bundles instead of breaking them.  */
 173
 174 #ifndef ASM_OUTPUT_DEBUG_LABEL
 175 #define ASM_OUTPUT_DEBUG_LABEL(FILE, PREFIX, NUM) \
 176   (*targetm.asm_out.internal_label) (FILE, PREFIX, NUM)
 177 #endif
 178
 179 /* This is how we tell the assembler that a symbol is weak.  */
 180 #ifndef ASM_OUTPUT_WEAK_ALIAS
 181 #if defined (ASM_WEAKEN_LABEL) && defined (ASM_OUTPUT_DEF)
 182 #define ASM_OUTPUT_WEAK_ALIAS(STREAM, NAME, VALUE)      \
 183   do                                                    \
 184     {                                                   \
 185       ASM_WEAKEN_LABEL (STREAM, NAME);                  \
 186       if (VALUE)                                        \
 187         ASM_OUTPUT_DEF (STREAM, NAME, VALUE);           \
 188     }                                                   \
 189   while (0)
 190 #endif
 191 #endif
 192
 193 /* How to emit a .type directive.  */
 194 #ifndef ASM_OUTPUT_TYPE_DIRECTIVE
 195 #if defined TYPE_ASM_OP && defined TYPE_OPERAND_FMT
 196 #define ASM_OUTPUT_TYPE_DIRECTIVE(STREAM, NAME, TYPE)   \
 197   do                                                    \
 198     {                                                   \
 199       fputs (TYPE_ASM_OP, STREAM);                      \
 200       assemble_name (STREAM, NAME);                     \
 201       fputs (", ", STREAM);                             \
 202       fprintf (STREAM, TYPE_OPERAND_FMT, TYPE);         \
 203       putc ('\n', STREAM);                              \
 204     }                                                   \
 205   while (0)
 206 #endif
 207 #endif
 208
 209 /* How to emit a .size directive.  */
 210 #ifndef ASM_OUTPUT_SIZE_DIRECTIVE
 211 #ifdef SIZE_ASM_OP
 212 #define ASM_OUTPUT_SIZE_DIRECTIVE(STREAM, NAME, SIZE)   \
 213   do                                                    \
 214     {                                                   \
 215       HOST_WIDE_INT size_ = (SIZE);                     \
 216       fputs (SIZE_ASM_OP, STREAM);                      \
 217       assemble_name (STREAM, NAME);                     \
 218       fprintf (STREAM, ", " HOST_WIDE_INT_PRINT_DEC "\n", size_); \
 219     }                                                   \
 220   while (0)
 221
 222 #define ASM_OUTPUT_MEASURED_SIZE(STREAM, NAME)          \
 223   do                                                    \
 224     {                                                   \
 225       fputs (SIZE_ASM_OP, STREAM);                      \
 226       assemble_name (STREAM, NAME);                     \
 227       fputs (", .-", STREAM);                           \
 228       assemble_name (STREAM, NAME);                     \
 229       putc ('\n', STREAM);                              \
 230     }                                                   \
 231   while (0)
 232
 233 #endif
 234 #endif
 235
 236 /* This determines whether or not we support weak symbols.  */
 237 #ifndef SUPPORTS_WEAK
 238 #if defined (ASM_WEAKEN_LABEL) || defined (ASM_WEAKEN_DECL)
 239 #define SUPPORTS_WEAK 1
 240 #else
 241 #define SUPPORTS_WEAK 0
 242 #endif
 243 #endif
 244
 245 /* This determines whether or not we support link-once semantics.  */
 246 #ifndef SUPPORTS_ONE_ONLY
 247 #ifdef MAKE_DECL_ONE_ONLY
 248 #define SUPPORTS_ONE_ONLY 1
 249 #else
 250 #define SUPPORTS_ONE_ONLY 0
 251 #endif
 252 #endif
 253
 254 /* This determines whether weak symbols must be left out of a static
 255    archive's table of contents.  Defining this macro to be nonzero has
 256    the consequence that certain symbols will not be made weak that
 257    otherwise would be.  The C++ ABI requires this macro to be zero;
 258    see the documentation.  */
 259 #ifndef TARGET_WEAK_NOT_IN_ARCHIVE_TOC
 260 #define TARGET_WEAK_NOT_IN_ARCHIVE_TOC 0
 261 #endif
 262
 263 /* This determines whether or not we need linkonce unwind information.  */
 264 #ifndef TARGET_USES_WEAK_UNWIND_INFO
 265 #define TARGET_USES_WEAK_UNWIND_INFO 0
 266 #endif
 267
 268 /* By default, there is no prefix on user-defined symbols.  */
 269 #ifndef USER_LABEL_PREFIX
 270 #define USER_LABEL_PREFIX ""
 271 #endif
 272
 273 /* If the target supports weak symbols, define TARGET_ATTRIBUTE_WEAK to
 274    provide a weak attribute.  Else define it to nothing.
 275
 276    This would normally belong in ansidecl.h, but SUPPORTS_WEAK is
 277    not available at that time.
 278
 279    Note, this is only for use by target files which we know are to be
 280    compiled by GCC.  */
 281 #ifndef TARGET_ATTRIBUTE_WEAK
 282 # if SUPPORTS_WEAK
 283 #  define TARGET_ATTRIBUTE_WEAK __attribute__ ((weak))
 284 # else
 285 #  define TARGET_ATTRIBUTE_WEAK
 286 # endif
 287 #endif
 288
 289 /* Determines whether we may use common symbols to represent one-only
 290    semantics (a.k.a. "vague linkage").  */
 291 #ifndef USE_COMMON_FOR_ONE_ONLY
 292 # define USE_COMMON_FOR_ONE_ONLY 1
 293 #endif
 294
 295 /* By default we can assume that all global symbols are in one namespace,
 296    across all shared libraries.  */
 297 #ifndef MULTIPLE_SYMBOL_SPACES
 298 # define MULTIPLE_SYMBOL_SPACES 0
 299 #endif
 300
 301 /* If the target supports init_priority C++ attribute, give
 302    SUPPORTS_INIT_PRIORITY a nonzero value.  */
 303 #ifndef SUPPORTS_INIT_PRIORITY
 304 #define SUPPORTS_INIT_PRIORITY 1
 305 #endif /* SUPPORTS_INIT_PRIORITY */
 306
 307 /* If duplicate library search directories can be removed from a
 308    linker command without changing the linker's semantics, give this
 309    symbol a nonzero.  */
 310 #ifndef LINK_ELIMINATE_DUPLICATE_LDIRECTORIES
 311 #define LINK_ELIMINATE_DUPLICATE_LDIRECTORIES 0
 312 #endif /* LINK_ELIMINATE_DUPLICATE_LDIRECTORIES */
 313
 314 /* If we have a definition of INCOMING_RETURN_ADDR_RTX, assume that
 315    the rest of the DWARF 2 frame unwind support is also provided.  */
 316 #if !defined (DWARF2_UNWIND_INFO) && defined (INCOMING_RETURN_ADDR_RTX)
 317 #define DWARF2_UNWIND_INFO 1
 318 #endif
 319
 320 /* If we have named sections, and we're using crtstuff to run ctors,
 321    use them for registering eh frame information.  */
 322 #if defined (TARGET_ASM_NAMED_SECTION) && DWARF2_UNWIND_INFO \
 323     && !defined(EH_FRAME_IN_DATA_SECTION)
 324 #ifndef EH_FRAME_SECTION_NAME
 325 #define EH_FRAME_SECTION_NAME ".eh_frame"
 326 #endif
 327 #endif
 328
 329 /* On many systems, different EH table encodings are used under
 330    difference circumstances.  Some will require runtime relocations;
 331    some will not.  For those that do not require runtime relocations,
 332    we would like to make the table read-only.  However, since the
 333    read-only tables may need to be combined with read-write tables
 334    that do require runtime relocation, it is not safe to make the
 335    tables read-only unless the linker will merge read-only and
 336    read-write sections into a single read-write section.  If your
 337    linker does not have this ability, but your system is such that no
 338    encoding used with non-PIC code will ever require a runtime
 339    relocation, then you can define EH_TABLES_CAN_BE_READ_ONLY to 1 in
 340    your target configuration file.  */
 341 #ifndef EH_TABLES_CAN_BE_READ_ONLY
 342 #ifdef HAVE_LD_RO_RW_SECTION_MIXING
 343 #define EH_TABLES_CAN_BE_READ_ONLY 1
 344 #else
 345 #define EH_TABLES_CAN_BE_READ_ONLY 0
 346 #endif
 347 #endif
 348
 349 /* If we have named section and we support weak symbols, then use the
 350    .jcr section for recording java classes which need to be registered
 351    at program start-up time.  */
 352 #if defined (TARGET_ASM_NAMED_SECTION) && SUPPORTS_WEAK
 353 #ifndef JCR_SECTION_NAME
 354 #define JCR_SECTION_NAME ".jcr"
 355 #endif
 356 #endif
 357
 358 /* This decision to use a .jcr section can be overridden by defining
 359    USE_JCR_SECTION to 0 in target file.  This is necessary if target
 360    can define JCR_SECTION_NAME but does not have crtstuff or
 361    linker support for .jcr section.  */
 362 #ifndef TARGET_USE_JCR_SECTION
 363 #ifdef JCR_SECTION_NAME
 364 #define TARGET_USE_JCR_SECTION 1
 365 #else
 366 #define TARGET_USE_JCR_SECTION 0
 367 #endif
 368 #endif
 369
 370 /* Number of hardware registers that go into the DWARF-2 unwind info.
 371    If not defined, equals FIRST_PSEUDO_REGISTER  */
 372
 373 #ifndef DWARF_FRAME_REGISTERS
 374 #define DWARF_FRAME_REGISTERS FIRST_PSEUDO_REGISTER
 375 #endif
 376
 377 /* How to renumber registers for dbx and gdb.  If not defined, assume
 378    no renumbering is necessary.  */
 379
 380 #ifndef DBX_REGISTER_NUMBER
 381 #define DBX_REGISTER_NUMBER(REGNO) (REGNO)
 382 #endif
 383
 384 /* Default sizes for base C types.  If the sizes are different for
 385    your target, you should override these values by defining the
 386    appropriate symbols in your tm.h file.  */
 387
 388 #ifndef BITS_PER_UNIT
 389 #define BITS_PER_UNIT 8
 390 #endif
 391
 392 #ifndef BITS_PER_WORD
 393 #define BITS_PER_WORD (BITS_PER_UNIT * UNITS_PER_WORD)
 394 #endif
 395
 396 #ifndef CHAR_TYPE_SIZE
 397 #define CHAR_TYPE_SIZE BITS_PER_UNIT
 398 #endif
 399
 400 #ifndef BOOL_TYPE_SIZE
 401 /* `bool' has size and alignment `1', on almost all platforms.  */
 402 #define BOOL_TYPE_SIZE CHAR_TYPE_SIZE
 403 #endif
 404
 405 #ifndef SHORT_TYPE_SIZE
 406 #define SHORT_TYPE_SIZE (BITS_PER_UNIT * MIN ((UNITS_PER_WORD + 1) / 2, 2))
 407 #endif
 408
 409 #ifndef INT_TYPE_SIZE
 410 #define INT_TYPE_SIZE BITS_PER_WORD
 411 #endif
 412
 413 #ifndef LONG_TYPE_SIZE
 414 #define LONG_TYPE_SIZE BITS_PER_WORD
 415 #endif
 416
 417 #ifndef LONG_LONG_TYPE_SIZE
 418 #define LONG_LONG_TYPE_SIZE (BITS_PER_WORD * 2)
 419 #endif
 420
 421 #ifndef WCHAR_TYPE_SIZE
 422 #define WCHAR_TYPE_SIZE INT_TYPE_SIZE
 423 #endif
 424
 425 #ifndef FLOAT_TYPE_SIZE
 426 #define FLOAT_TYPE_SIZE BITS_PER_WORD
 427 #endif
 428
 429 #ifndef DOUBLE_TYPE_SIZE
 430 #define DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
 431 #endif
 432
 433 #ifndef LONG_DOUBLE_TYPE_SIZE
 434 #define LONG_DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
 435 #endif
 436
 437 /* Width in bits of a pointer.  Mind the value of the macro `Pmode'.  */
 438 #ifndef POINTER_SIZE
 439 #define POINTER_SIZE BITS_PER_WORD
 440 #endif
 441
 442 #ifndef PIC_OFFSET_TABLE_REGNUM
 443 #define PIC_OFFSET_TABLE_REGNUM INVALID_REGNUM
 444 #endif
 445
 446 #ifndef TARGET_DLLIMPORT_DECL_ATTRIBUTES
 447 #define TARGET_DLLIMPORT_DECL_ATTRIBUTES 0
 448 #endif
 449
 450 #ifndef TARGET_DECLSPEC
 451 #if TARGET_DLLIMPORT_DECL_ATTRIBUTES
 452 /* If the target supports the "dllimport" attribute, users are
 453    probably used to the "__declspec" syntax.  */
 454 #define TARGET_DECLSPEC 1
 455 #else
 456 #define TARGET_DECLSPEC 0
 457 #endif
 458 #endif
 459
 460 /* By default, the preprocessor should be invoked the same way in C++
 461    as in C.  */
 462 #ifndef CPLUSPLUS_CPP_SPEC
 463 #ifdef CPP_SPEC
 464 #define CPLUSPLUS_CPP_SPEC CPP_SPEC
 465 #endif
 466 #endif
 467
 468 #ifndef ACCUMULATE_OUTGOING_ARGS
 469 #define ACCUMULATE_OUTGOING_ARGS 0
 470 #endif
 471
 472 /* Supply a default definition for PUSH_ARGS.  */
 473 #ifndef PUSH_ARGS
 474 #ifdef PUSH_ROUNDING
 475 #define PUSH_ARGS       !ACCUMULATE_OUTGOING_ARGS
 476 #else
 477 #define PUSH_ARGS       0
 478 #endif
 479 #endif
 480
 481 /* Decide whether a function's arguments should be processed
 482    from first to last or from last to first.
 483
 484    They should if the stack and args grow in opposite directions, but
 485    only if we have push insns.  */
 486
 487 #ifdef PUSH_ROUNDING
 488
 489 #ifndef PUSH_ARGS_REVERSED
 490 #if defined (STACK_GROWS_DOWNWARD) != defined (ARGS_GROW_DOWNWARD)
 491 #define PUSH_ARGS_REVERSED  PUSH_ARGS
 492 #endif
 493 #endif
 494
 495 #endif
 496
 497 #ifndef PUSH_ARGS_REVERSED
 498 #define PUSH_ARGS_REVERSED 0
 499 #endif
 500
 501 /* If PREFERRED_STACK_BOUNDARY is not defined, set it to STACK_BOUNDARY.
 502    STACK_BOUNDARY is required.  */
 503 #ifndef PREFERRED_STACK_BOUNDARY
 504 #define PREFERRED_STACK_BOUNDARY STACK_BOUNDARY
 505 #endif
 506
 507 #ifndef TARGET_DEFAULT_PACK_STRUCT
 508 #define TARGET_DEFAULT_PACK_STRUCT 0
 509 #endif
 510
 511 /* By default, the C++ compiler will use function addresses in the
 512    vtable entries.  Setting this nonzero tells the compiler to use
 513    function descriptors instead.  The value of this macro says how
 514    many words wide the descriptor is (normally 2).  It is assumed
 515    that the address of a function descriptor may be treated as a
 516    pointer to a function.  */
 517 #ifndef TARGET_VTABLE_USES_DESCRIPTORS
 518 #define TARGET_VTABLE_USES_DESCRIPTORS 0
 519 #endif
 520
 521 /* By default, the vtable entries are void pointers, the so the alignment
 522    is the same as pointer alignment.  The value of this macro specifies
 523    the alignment of the vtable entry in bits.  It should be defined only
 524    when special alignment is necessary.  */
 525 #ifndef TARGET_VTABLE_ENTRY_ALIGN
 526 #define TARGET_VTABLE_ENTRY_ALIGN POINTER_SIZE
 527 #endif
 528
 529 /* There are a few non-descriptor entries in the vtable at offsets below
 530    zero.  If these entries must be padded (say, to preserve the alignment
 531    specified by TARGET_VTABLE_ENTRY_ALIGN), set this to the number of
 532    words in each data entry.  */
 533 #ifndef TARGET_VTABLE_DATA_ENTRY_DISTANCE
 534 #define TARGET_VTABLE_DATA_ENTRY_DISTANCE 1
 535 #endif
 536
 537 /* Decide whether it is safe to use a local alias for a virtual function
 538    when constructing thunks.  */
 539 #ifndef TARGET_USE_LOCAL_THUNK_ALIAS_P
 540 #ifdef ASM_OUTPUT_DEF
 541 #define TARGET_USE_LOCAL_THUNK_ALIAS_P(DECL) 1
 542 #else
 543 #define TARGET_USE_LOCAL_THUNK_ALIAS_P(DECL) 0
 544 #endif
 545 #endif
 546
 547 /* Select a format to encode pointers in exception handling data.  We
 548    prefer those that result in fewer dynamic relocations.  Assume no
 549    special support here and encode direct references.  */
 550 #ifndef ASM_PREFERRED_EH_DATA_FORMAT
 551 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE,GLOBAL)  DW_EH_PE_absptr
 552 #endif
 553
 554 /* By default, the C++ compiler will use the lowest bit of the pointer
 555    to function to indicate a pointer-to-member-function points to a
 556    virtual member function.  However, if FUNCTION_BOUNDARY indicates
 557    function addresses aren't always even, the lowest bit of the delta
 558    field will be used.  */
 559 #ifndef TARGET_PTRMEMFUNC_VBIT_LOCATION
 560 #define TARGET_PTRMEMFUNC_VBIT_LOCATION \
 561   (FUNCTION_BOUNDARY >= 2 * BITS_PER_UNIT \
 562    ? ptrmemfunc_vbit_in_pfn : ptrmemfunc_vbit_in_delta)
 563 #endif
 564
 565 #ifndef DEFAULT_GDB_EXTENSIONS
 566 #define DEFAULT_GDB_EXTENSIONS 1
 567 #endif
 568
 569 /* If more than one debugging type is supported, you must define
 570    PREFERRED_DEBUGGING_TYPE to choose the default.  */
 571
 572 #if 1 < (defined (DBX_DEBUGGING_INFO) + defined (SDB_DEBUGGING_INFO) \
 573          + defined (DWARF2_DEBUGGING_INFO) + defined (XCOFF_DEBUGGING_INFO) \
 574          + defined (VMS_DEBUGGING_INFO))
 575 #ifndef PREFERRED_DEBUGGING_TYPE
 576 #error You must define PREFERRED_DEBUGGING_TYPE
 577 #endif /* no PREFERRED_DEBUGGING_TYPE */
 578
 579 /* If only one debugging format is supported, define PREFERRED_DEBUGGING_TYPE
 580    here so other code needn't care.  */
 581 #elif defined DBX_DEBUGGING_INFO
 582 #define PREFERRED_DEBUGGING_TYPE DBX_DEBUG
 583
 584 #elif defined SDB_DEBUGGING_INFO
 585 #define PREFERRED_DEBUGGING_TYPE SDB_DEBUG
 586
 587 #elif defined DWARF2_DEBUGGING_INFO
 588 #define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
 589
 590 #elif defined VMS_DEBUGGING_INFO
 591 #define PREFERRED_DEBUGGING_TYPE VMS_AND_DWARF2_DEBUG
 592
 593 #elif defined XCOFF_DEBUGGING_INFO
 594 #define PREFERRED_DEBUGGING_TYPE XCOFF_DEBUG
 595
 596 #else
 597 /* No debugging format is supported by this target.  */
 598 #define PREFERRED_DEBUGGING_TYPE NO_DEBUG
 599 #endif
 600
 601 /* Define codes for all the float formats that we know of.  */
 602 #define UNKNOWN_FLOAT_FORMAT 0
 603 #define IEEE_FLOAT_FORMAT 1
 604 #define VAX_FLOAT_FORMAT 2
 605 #define IBM_FLOAT_FORMAT 3
 606 #define C4X_FLOAT_FORMAT 4
 607
 608 /* Default to IEEE float if not specified.  Nearly all machines use it.  */
 609 #ifndef TARGET_FLOAT_FORMAT
 610 #define TARGET_FLOAT_FORMAT     IEEE_FLOAT_FORMAT
 611 #endif
 612
 613 /* Some macros can be defined by the backend in either a mode-dependent
 614    or mode-independent form.  The compiler proper should only use the
 615    mode-dependent form, providing VOIDmode when the mode is unknown.
 616    We can't poison the macros because the backend may reference them.  */
 617
 618 #ifndef REGNO_MODE_OK_FOR_BASE_P
 619 #define REGNO_MODE_OK_FOR_BASE_P(REGNO, MODE) REGNO_OK_FOR_BASE_P (REGNO)
 620 #endif
 621
 622 #ifndef REG_MODE_OK_FOR_BASE_P
 623 #define REG_MODE_OK_FOR_BASE_P(REG, MODE) REG_OK_FOR_BASE_P (REG)
 624 #endif
 625
 626 /* Determine the register class for registers suitable to be the base
 627    address register in a MEM.  Allow the choice to be dependent upon
 628    the mode of the memory access.  */
 629 #ifndef MODE_BASE_REG_CLASS
 630 #define MODE_BASE_REG_CLASS(MODE) BASE_REG_CLASS
 631 #endif
 632
 633 /* Some machines require a different base register class if the index
 634    is a register.  By default, assume that a base register is acceptable.  */
 635 #ifndef MODE_BASE_REG_REG_CLASS
 636 #define MODE_BASE_REG_REG_CLASS(MODE) MODE_BASE_REG_CLASS(MODE)
 637 #endif
 638
 639 #ifndef REGNO_MODE_OK_FOR_REG_BASE_P
 640 #define REGNO_MODE_OK_FOR_REG_BASE_P(REGNO, MODE) REGNO_MODE_OK_FOR_BASE_P (REGNO, MODE)
 641 #endif
 642
 643 #ifndef REG_MODE_OK_FOR_REG_BASE_P
 644 #define REG_MODE_OK_FOR_REG_BASE_P(REGNO, MODE) REG_MODE_OK_FOR_BASE_P (REGNO, MODE)
 645 #endif
 646
 647 #ifndef LARGEST_EXPONENT_IS_NORMAL
 648 #define LARGEST_EXPONENT_IS_NORMAL(SIZE) 0
 649 #endif
 650
 651 #ifndef ROUND_TOWARDS_ZERO
 652 #define ROUND_TOWARDS_ZERO 0
 653 #endif
 654
 655 #ifndef MODE_HAS_NANS
 656 #define MODE_HAS_NANS(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_INFINITIES
 663 #define MODE_HAS_INFINITIES(MODE)                               \
 664   (FLOAT_MODE_P (MODE)                                          \
 665    && TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT                  \
 666    && !LARGEST_EXPONENT_IS_NORMAL (GET_MODE_BITSIZE (MODE)))
 667 #endif
 668
 669 #ifndef MODE_HAS_SIGNED_ZEROS
 670 #define MODE_HAS_SIGNED_ZEROS(MODE) \
 671   (FLOAT_MODE_P (MODE) && TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT)
 672 #endif
 673
 674 #ifndef MODE_HAS_SIGN_DEPENDENT_ROUNDING
 675 #define MODE_HAS_SIGN_DEPENDENT_ROUNDING(MODE)                  \
 676   (FLOAT_MODE_P (MODE)                                          \
 677    && TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT                  \
 678    && !ROUND_TOWARDS_ZERO)
 679 #endif
 680
 681 #ifndef FLOAT_LIB_COMPARE_RETURNS_BOOL
 682 #define FLOAT_LIB_COMPARE_RETURNS_BOOL(MODE, COMPARISON) false
 683 #endif
 684
 685 /* True if the targets integer-comparison functions return { 0, 1, 2
 686    } to indicate { <, ==, > }.  False if { -1, 0, 1 } is used
 687    instead.  The libgcc routines are biased.  */
 688 #ifndef TARGET_LIB_INT_CMP_BIASED
 689 #define TARGET_LIB_INT_CMP_BIASED (true)
 690 #endif
 691
 692 /* If FLOAT_WORDS_BIG_ENDIAN is not defined in the header files,
 693    then the word-endianness is the same as for integers.  */
 694 #ifndef FLOAT_WORDS_BIG_ENDIAN
 695 #define FLOAT_WORDS_BIG_ENDIAN WORDS_BIG_ENDIAN
 696 #endif
 697
 698 #ifndef TARGET_FLT_EVAL_METHOD
 699 #define TARGET_FLT_EVAL_METHOD 0
 700 #endif
 701
 702 #ifndef HOT_TEXT_SECTION_NAME
 703 #define HOT_TEXT_SECTION_NAME ".text.hot"
 704 #endif
 705
 706 #ifndef UNLIKELY_EXECUTED_TEXT_SECTION_NAME
 707 #define UNLIKELY_EXECUTED_TEXT_SECTION_NAME ".text.unlikely"
 708 #endif
 709
 710 #ifndef HAS_LONG_COND_BRANCH
 711 #define HAS_LONG_COND_BRANCH 0
 712 #endif
 713
 714 #ifndef HAS_LONG_UNCOND_BRANCH
 715 #define HAS_LONG_UNCOND_BRANCH 0
 716 #endif
 717
 718 #ifndef UNITS_PER_SIMD_WORD
 719 #define UNITS_PER_SIMD_WORD 0
 720 #endif
 721
 722 /* Determine whether __cxa_atexit, rather than atexit, is used to
 723    register C++ destructors for local statics and global objects.  */
 724 #ifndef DEFAULT_USE_CXA_ATEXIT
 725 #define DEFAULT_USE_CXA_ATEXIT 0
 726 #endif
 727
 728 /* Determine whether extra constraint letter should be handled
 729    via address reload (like 'o').  */
 730 #ifndef EXTRA_MEMORY_CONSTRAINT
 731 #define EXTRA_MEMORY_CONSTRAINT(C,STR) 0
 732 #endif
 733
 734 /* Determine whether extra constraint letter should be handled
 735    as an address (like 'p').  */
 736 #ifndef EXTRA_ADDRESS_CONSTRAINT
 737 #define EXTRA_ADDRESS_CONSTRAINT(C,STR) 0
 738 #endif
 739
 740 /* When a port defines CONSTRAINT_LEN, it should use DEFAULT_CONSTRAINT_LEN
 741    for all the characters that it does not want to change, so things like the
 742   'length' of a digit in a matching constraint is an implementation detail,
 743    and not part of the interface.  */
 744 #define DEFAULT_CONSTRAINT_LEN(C,STR) 1
 745
 746 #ifndef CONSTRAINT_LEN
 747 #define CONSTRAINT_LEN(C,STR) DEFAULT_CONSTRAINT_LEN (C, STR)
 748 #endif
 749
 750 #if defined (CONST_OK_FOR_LETTER_P) && ! defined (CONST_OK_FOR_CONSTRAINT_P)
 751 #define CONST_OK_FOR_CONSTRAINT_P(VAL,C,STR) CONST_OK_FOR_LETTER_P (VAL, C)
 752 #endif
 753
 754 #if defined (CONST_DOUBLE_OK_FOR_LETTER_P) && ! defined (CONST_DOUBLE_OK_FOR_CONSTRAINT_P)
 755 #define CONST_DOUBLE_OK_FOR_CONSTRAINT_P(OP,C,STR) \
 756   CONST_DOUBLE_OK_FOR_LETTER_P (OP, C)
 757 #endif
 758
 759 #ifndef REG_CLASS_FROM_CONSTRAINT
 760 #define REG_CLASS_FROM_CONSTRAINT(C,STR) REG_CLASS_FROM_LETTER (C)
 761 #endif
 762
 763 #if defined (EXTRA_CONSTRAINT) && ! defined (EXTRA_CONSTRAINT_STR)
 764 #define EXTRA_CONSTRAINT_STR(OP, C,STR) EXTRA_CONSTRAINT (OP, C)
 765 #endif
 766
 767 #ifndef REGISTER_MOVE_COST
 768 #define REGISTER_MOVE_COST(m, x, y) 2
 769 #endif
 770
 771 /* Determine whether the the entire c99 runtime
 772    is present in the runtime library.  */
 773 #ifndef TARGET_C99_FUNCTIONS
 774 #define TARGET_C99_FUNCTIONS 0
 775 #endif
 776
 777 /* Indicate that CLZ and CTZ are undefined at zero.  */
 778 #ifndef CLZ_DEFINED_VALUE_AT_ZERO
 779 #define CLZ_DEFINED_VALUE_AT_ZERO(MODE, VALUE)  0
 780 #endif
 781 #ifndef CTZ_DEFINED_VALUE_AT_ZERO
 782 #define CTZ_DEFINED_VALUE_AT_ZERO(MODE, VALUE)  0
 783 #endif
 784
 785 /* Provide a default value for STORE_FLAG_VALUE.  */
 786 #ifndef STORE_FLAG_VALUE
 787 #define STORE_FLAG_VALUE  1
 788 #endif
 789
 790 /* This macro is used to determine what the largest unit size that
 791    move_by_pieces can use is.  */
 792
 793 /* MOVE_MAX_PIECES is the number of bytes at a time which we can
 794    move efficiently, as opposed to  MOVE_MAX which is the maximum
 795    number of bytes we can move with a single instruction.  */
 796
 797 #ifndef MOVE_MAX_PIECES
 798 #define MOVE_MAX_PIECES   MOVE_MAX
 799 #endif
 800
 801 #ifndef STACK_POINTER_OFFSET
 802 #define STACK_POINTER_OFFSET    0
 803 #endif
 804
 805 #ifndef LOCAL_REGNO
 806 #define LOCAL_REGNO(REGNO)  0
 807 #endif
 808
 809 /* EXIT_IGNORE_STACK should be nonzero if, when returning from a function,
 810    the stack pointer does not matter.  The value is tested only in
 811    functions that have frame pointers.  */
 812 #ifndef EXIT_IGNORE_STACK
 813 #define EXIT_IGNORE_STACK 0
 814 #endif
 815
 816 /* Assume that case vectors are not pc-relative.  */
 817 #ifndef CASE_VECTOR_PC_RELATIVE
 818 #define CASE_VECTOR_PC_RELATIVE 0
 819 #endif
 820
 821 /* Assume that trampolines need function alignment.  */
 822 #ifndef TRAMPOLINE_ALIGNMENT
 823 #define TRAMPOLINE_ALIGNMENT FUNCTION_BOUNDARY
 824 #endif
 825
 826 /* Register mappings for target machines without register windows.  */
 827 #ifndef INCOMING_REGNO
 828 #define INCOMING_REGNO(N) (N)
 829 #endif
 830
 831 #ifndef OUTGOING_REGNO
 832 #define OUTGOING_REGNO(N) (N)
 833 #endif
 834
 835 #ifndef SHIFT_COUNT_TRUNCATED
 836 #define SHIFT_COUNT_TRUNCATED 0
 837 #endif
 838
 839 #ifndef LEGITIMIZE_ADDRESS
 840 #define LEGITIMIZE_ADDRESS(X, OLDX, MODE, WIN)
 841 #endif
 842
 843 #ifndef LEGITIMATE_PIC_OPERAND_P
 844 #define LEGITIMATE_PIC_OPERAND_P(X) 1
 845 #endif
 846
 847 #ifndef REVERSIBLE_CC_MODE
 848 #define REVERSIBLE_CC_MODE(MODE) 0
 849 #endif
 850
 851 /* Biggest alignment supported by the object file format of this machine.  */
 852 #ifndef MAX_OFILE_ALIGNMENT
 853 #define MAX_OFILE_ALIGNMENT BIGGEST_ALIGNMENT
 854 #endif
 855
 856 #endif  /* ! GCC_DEFAULTS_H */