gcc/defaults.h

   1 /* Definitions of various defaults for tm.h macros.
   2    Copyright (C) 1992, 1996, 1997, 1998, 1999, 2000, 2001, 2002
   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 /* Define default standard character escape sequences.  */
  27 #ifndef TARGET_BELL
  28 #  define TARGET_BELL 007
  29 #  define TARGET_BS 010
  30 #  define TARGET_TAB 011
  31 #  define TARGET_NEWLINE 012
  32 #  define TARGET_VT 013
  33 #  define TARGET_FF 014
  34 #  define TARGET_CR 015
  35 #  define TARGET_ESC 033
  36 #endif
  37
  38 /* When removal of CPP_PREDEFINES is complete, TARGET_CPU_CPP_BULITINS
  39    can also be removed from here.  */
  40 #ifndef TARGET_OS_CPP_BUILTINS
  41 # define TARGET_OS_CPP_BUILTINS()
  42 #endif
  43 #ifndef TARGET_CPU_CPP_BUILTINS
  44 # define TARGET_CPU_CPP_BUILTINS()
  45 #endif
  46 #ifndef CPP_PREDEFINES
  47 # define CPP_PREDEFINES ""
  48 #endif
  49
  50 /* Store in OUTPUT a string (made with alloca) containing
  51    an assembler-name for a local static variable or function named NAME.
  52    LABELNO is an integer which is different for each call.  */
  53
  54 #ifndef ASM_FORMAT_PRIVATE_NAME
  55 #define ASM_FORMAT_PRIVATE_NAME(OUTPUT, NAME, LABELNO)                  \
  56   do {                                                                  \
  57     int len = strlen (NAME);                                            \
  58     char *temp = (char *) alloca (len + 3);                             \
  59     temp[0] = 'L';                                                      \
  60     strcpy (&temp[1], (NAME));                                          \
  61     temp[len + 1] = '.';                                                \
  62     temp[len + 2] = 0;                                                  \
  63     (OUTPUT) = (char *) alloca (strlen (NAME) + 11);                    \
  64     ASM_GENERATE_INTERNAL_LABEL (OUTPUT, temp, LABELNO);                \
  65   } while (0)
  66 #endif
  67
  68 #ifndef ASM_STABD_OP
  69 #define ASM_STABD_OP "\t.stabd\t"
  70 #endif
  71
  72 /* This is how to output an element of a case-vector that is absolute.
  73    Some targets don't use this, but we have to define it anyway.  */
  74
  75 #ifndef ASM_OUTPUT_ADDR_VEC_ELT
  76 #define ASM_OUTPUT_ADDR_VEC_ELT(FILE, VALUE)  \
  77 do { fputs (integer_asm_op (POINTER_SIZE / UNITS_PER_WORD, TRUE), FILE); \
  78      ASM_OUTPUT_INTERNAL_LABEL (FILE, "L", (VALUE));                    \
  79      fputc ('\n', FILE);                                                \
  80    } while (0)
  81 #endif
  82
  83 /* Provide default for ASM_OUTPUT_ALTERNATE_LABEL_NAME.  */
  84 #ifndef ASM_OUTPUT_ALTERNATE_LABEL_NAME
  85 #define ASM_OUTPUT_ALTERNATE_LABEL_NAME(FILE,INSN) \
  86 do { ASM_OUTPUT_LABEL(FILE,LABEL_ALTERNATE_NAME (INSN)); } while (0)
  87 #endif
  88
  89 /* choose a reasonable default for ASM_OUTPUT_ASCII.  */
  90
  91 #ifndef ASM_OUTPUT_ASCII
  92 #define ASM_OUTPUT_ASCII(MYFILE, MYSTRING, MYLENGTH) \
  93   do {                                                                        \
  94     FILE *_hide_asm_out_file = (MYFILE);                                      \
  95     const unsigned char *_hide_p = (const unsigned char *) (MYSTRING);        \
  96     int _hide_thissize = (MYLENGTH);                                          \
  97     {                                                                         \
  98       FILE *asm_out_file = _hide_asm_out_file;                                \
  99       const unsigned char *p = _hide_p;                                       \
 100       int thissize = _hide_thissize;                                          \
 101       int i;                                                                  \
 102       fprintf (asm_out_file, "\t.ascii \"");                                  \
 103                                                                               \
 104       for (i = 0; i < thissize; i++)                                          \
 105         {                                                                     \
 106           int c = p[i];                                                       \
 107           if (c == '\"' || c == '\\')                                         \
 108             putc ('\\', asm_out_file);                                        \
 109           if (ISPRINT(c))                                                     \
 110             putc (c, asm_out_file);                                           \
 111           else                                                                \
 112             {                                                                 \
 113               fprintf (asm_out_file, "\\%o", c);                              \
 114               /* After an octal-escape, if a digit follows,                   \
 115                  terminate one string constant and start another.             \
 116                  The VAX assembler fails to stop reading the escape           \
 117                  after three digits, so this is the only way we               \
 118                  can get it to parse the data properly.  */                   \
 119               if (i < thissize - 1 && ISDIGIT(p[i + 1]))                      \
 120                 fprintf (asm_out_file, "\"\n\t.ascii \"");                    \
 121           }                                                                   \
 122         }                                                                     \
 123       fprintf (asm_out_file, "\"\n");                                         \
 124     }                                                                         \
 125   }                                                                           \
 126   while (0)
 127 #endif
 128
 129 /* This is how we tell the assembler to equate two values.  */
 130 #ifdef SET_ASM_OP
 131 #ifndef ASM_OUTPUT_DEF
 132 #define ASM_OUTPUT_DEF(FILE,LABEL1,LABEL2)                              \
 133  do {   fprintf ((FILE), "%s", SET_ASM_OP);                             \
 134         assemble_name (FILE, LABEL1);                                   \
 135         fprintf (FILE, ",");                                            \
 136         assemble_name (FILE, LABEL2);                                   \
 137         fprintf (FILE, "\n");                                           \
 138   } while (0)
 139 #endif
 140 #endif
 141
 142 /* This is how to output a reference to a user-level label named NAME.  */
 143
 144 #ifndef ASM_OUTPUT_LABELREF
 145 #define ASM_OUTPUT_LABELREF(FILE,NAME)  asm_fprintf ((FILE), "%U%s", (NAME))
 146 #endif
 147
 148 /* Allow target to print debug info labels specially.  This is useful for
 149    VLIW targets, since debug info labels should go into the middle of
 150    instruction bundles instead of breaking them.  */
 151
 152 #ifndef ASM_OUTPUT_DEBUG_LABEL
 153 #define ASM_OUTPUT_DEBUG_LABEL(FILE, PREFIX, NUM) \
 154   ASM_OUTPUT_INTERNAL_LABEL (FILE, PREFIX, NUM)
 155 #endif
 156
 157 /* This is how we tell the assembler that a symbol is weak.  */
 158 #ifndef ASM_OUTPUT_WEAK_ALIAS
 159 #if defined (ASM_WEAKEN_LABEL) && defined (ASM_OUTPUT_DEF)
 160 #define ASM_OUTPUT_WEAK_ALIAS(STREAM, NAME, VALUE)      \
 161   do                                                    \
 162     {                                                   \
 163       ASM_WEAKEN_LABEL (STREAM, NAME);                  \
 164       if (VALUE)                                        \
 165         ASM_OUTPUT_DEF (STREAM, NAME, VALUE);           \
 166     }                                                   \
 167   while (0)
 168 #endif
 169 #endif
 170
 171 /* This determines whether or not we support weak symbols.  */
 172 #ifndef SUPPORTS_WEAK
 173 #if defined (ASM_WEAKEN_LABEL) || defined (ASM_WEAKEN_DECL)
 174 #define SUPPORTS_WEAK 1
 175 #else
 176 #define SUPPORTS_WEAK 0
 177 #endif
 178 #endif
 179
 180 /* This determines whether or not we support link-once semantics.  */
 181 #ifndef SUPPORTS_ONE_ONLY
 182 #ifdef MAKE_DECL_ONE_ONLY
 183 #define SUPPORTS_ONE_ONLY 1
 184 #else
 185 #define SUPPORTS_ONE_ONLY 0
 186 #endif
 187 #endif
 188
 189 /* If the target supports weak symbols, define TARGET_ATTRIBUTE_WEAK to
 190    provide a weak attribute.  Else define it to nothing.
 191
 192    This would normally belong in ansidecl.h, but SUPPORTS_WEAK is
 193    not available at that time.
 194
 195    Note, this is only for use by target files which we know are to be
 196    compiled by GCC.  */
 197 #ifndef TARGET_ATTRIBUTE_WEAK
 198 # if SUPPORTS_WEAK
 199 #  define TARGET_ATTRIBUTE_WEAK __attribute__ ((weak))
 200 # else
 201 #  define TARGET_ATTRIBUTE_WEAK
 202 # endif
 203 #endif
 204
 205 /* If the target supports init_priority C++ attribute, give
 206    SUPPORTS_INIT_PRIORITY a nonzero value.  */
 207 #ifndef SUPPORTS_INIT_PRIORITY
 208 #define SUPPORTS_INIT_PRIORITY 1
 209 #endif /* SUPPORTS_INIT_PRIORITY */
 210
 211 /* If duplicate library search directories can be removed from a
 212    linker command without changing the linker's semantics, give this
 213    symbol a nonzero.  */
 214 #ifndef LINK_ELIMINATE_DUPLICATE_LDIRECTORIES
 215 #define LINK_ELIMINATE_DUPLICATE_LDIRECTORIES 0
 216 #endif /* LINK_ELIMINATE_DUPLICATE_LDIRECTORIES */
 217
 218 /* If we have a definition of INCOMING_RETURN_ADDR_RTX, assume that
 219    the rest of the DWARF 2 frame unwind support is also provided.  */
 220 #if !defined (DWARF2_UNWIND_INFO) && defined (INCOMING_RETURN_ADDR_RTX)
 221 #define DWARF2_UNWIND_INFO 1
 222 #endif
 223
 224 /* If we have named sections, and we're using crtstuff to run ctors,
 225    use them for registering eh frame information.  */
 226 #if defined (TARGET_ASM_NAMED_SECTION) && !defined(EH_FRAME_IN_DATA_SECTION)
 227 #ifndef EH_FRAME_SECTION_NAME
 228 #define EH_FRAME_SECTION_NAME ".eh_frame"
 229 #endif
 230 #endif
 231
 232 /* If we have named section and we support weak symbols, then use the
 233    .jcr section for recording java classes which need to be registered
 234    at program start-up time.  */
 235 #if defined (TARGET_ASM_NAMED_SECTION) && SUPPORTS_WEAK
 236 #ifndef JCR_SECTION_NAME
 237 #define JCR_SECTION_NAME ".jcr"
 238 #endif
 239 #endif
 240
 241 /* By default, we generate a label at the beginning and end of the
 242    text section, and compute the size of the text section by
 243    subtracting the two.  However, on some platforms that doesn't
 244    work, and we use the section itself, rather than a label at the
 245    beginning of it, to indicate the start of the section.  On such
 246    platforms, define this to zero.  */
 247 #ifndef DWARF2_GENERATE_TEXT_SECTION_LABEL
 248 #define DWARF2_GENERATE_TEXT_SECTION_LABEL 1
 249 #endif
 250
 251 /* Supply a default definition for PROMOTE_PROTOTYPES.  */
 252 #ifndef PROMOTE_PROTOTYPES
 253 #define PROMOTE_PROTOTYPES      0
 254 #endif
 255
 256 /* Number of hardware registers that go into the DWARF-2 unwind info.
 257    If not defined, equals FIRST_PSEUDO_REGISTER  */
 258
 259 #ifndef DWARF_FRAME_REGISTERS
 260 #define DWARF_FRAME_REGISTERS FIRST_PSEUDO_REGISTER
 261 #endif
 262
 263 /* How to renumber registers for dbx and gdb.  If not defined, assume
 264    no renumbering is necessary.  */
 265
 266 #ifndef DBX_REGISTER_NUMBER
 267 #define DBX_REGISTER_NUMBER(REGNO) (REGNO)
 268 #endif
 269
 270 /* Default sizes for base C types.  If the sizes are different for
 271    your target, you should override these values by defining the
 272    appropriate symbols in your tm.h file.  */
 273
 274 #ifndef BITS_PER_UNIT
 275 #define BITS_PER_UNIT 8
 276 #endif
 277
 278 #ifndef BITS_PER_WORD
 279 #define BITS_PER_WORD (BITS_PER_UNIT * UNITS_PER_WORD)
 280 #endif
 281
 282 #ifndef CHAR_TYPE_SIZE
 283 #define CHAR_TYPE_SIZE BITS_PER_UNIT
 284 #endif
 285
 286 #ifndef BOOL_TYPE_SIZE
 287 /* `bool' has size and alignment `1', on almost all platforms.  */
 288 #define BOOL_TYPE_SIZE CHAR_TYPE_SIZE
 289 #endif
 290
 291 #ifndef SHORT_TYPE_SIZE
 292 #define SHORT_TYPE_SIZE (BITS_PER_UNIT * MIN ((UNITS_PER_WORD + 1) / 2, 2))
 293 #endif
 294
 295 #ifndef INT_TYPE_SIZE
 296 #define INT_TYPE_SIZE BITS_PER_WORD
 297 #endif
 298
 299 #ifndef LONG_TYPE_SIZE
 300 #define LONG_TYPE_SIZE BITS_PER_WORD
 301 #endif
 302
 303 #ifndef LONG_LONG_TYPE_SIZE
 304 #define LONG_LONG_TYPE_SIZE (BITS_PER_WORD * 2)
 305 #endif
 306
 307 #ifndef WCHAR_TYPE_SIZE
 308 #define WCHAR_TYPE_SIZE INT_TYPE_SIZE
 309 #endif
 310
 311 #ifndef FLOAT_TYPE_SIZE
 312 #define FLOAT_TYPE_SIZE BITS_PER_WORD
 313 #endif
 314
 315 #ifndef DOUBLE_TYPE_SIZE
 316 #define DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
 317 #endif
 318
 319 #ifndef LONG_DOUBLE_TYPE_SIZE
 320 #define LONG_DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
 321 #endif
 322
 323 /* Width in bits of a pointer.  Mind the value of the macro `Pmode'.  */
 324 #ifndef POINTER_SIZE
 325 #define POINTER_SIZE BITS_PER_WORD
 326 #endif
 327
 328 #ifndef BUILD_VA_LIST_TYPE
 329 #define BUILD_VA_LIST_TYPE(X) ((X) = ptr_type_node)
 330 #endif
 331
 332 #ifndef PIC_OFFSET_TABLE_REGNUM
 333 #define PIC_OFFSET_TABLE_REGNUM INVALID_REGNUM
 334 #endif
 335
 336 /* Type used by GCOV counters.  Use 64bit data type if target supports
 337    it.  */
 338 #if LONG_TYPE_SIZE >= 64
 339 #define GCOV_TYPE_SIZE LONG_TYPE_SIZE
 340 #else
 341 #define GCOV_TYPE_SIZE LONG_LONG_TYPE_SIZE
 342 #endif
 343
 344
 345 /* By default, the preprocessor should be invoked the same way in C++
 346    as in C.  */
 347 #ifndef CPLUSPLUS_CPP_SPEC
 348 #ifdef CPP_SPEC
 349 #define CPLUSPLUS_CPP_SPEC CPP_SPEC
 350 #endif
 351 #endif
 352
 353 #ifndef ACCUMULATE_OUTGOING_ARGS
 354 #define ACCUMULATE_OUTGOING_ARGS 0
 355 #endif
 356
 357 /* Supply a default definition for PUSH_ARGS.  */
 358 #ifndef PUSH_ARGS
 359 #ifdef PUSH_ROUNDING
 360 #define PUSH_ARGS       !ACCUMULATE_OUTGOING_ARGS
 361 #else
 362 #define PUSH_ARGS       0
 363 #endif
 364 #endif
 365
 366 /* If PREFERRED_STACK_BOUNDARY is not defined, set it to STACK_BOUNDARY.
 367    STACK_BOUNDARY is required.  */
 368 #ifndef PREFERRED_STACK_BOUNDARY
 369 #define PREFERRED_STACK_BOUNDARY STACK_BOUNDARY
 370 #endif
 371
 372 /* By default, the C++ compiler will use function addresses in the
 373    vtable entries.  Setting this non-zero tells the compiler to use
 374    function descriptors instead.  The value of this macro says how
 375    many words wide the descriptor is (normally 2).  It is assumed
 376    that the address of a function descriptor may be treated as a
 377    pointer to a function.  */
 378 #ifndef TARGET_VTABLE_USES_DESCRIPTORS
 379 #define TARGET_VTABLE_USES_DESCRIPTORS 0
 380 #endif
 381
 382 /* Select a format to encode pointers in exception handling data.  We
 383    prefer those that result in fewer dynamic relocations.  Assume no
 384    special support here and encode direct references.  */
 385 #ifndef ASM_PREFERRED_EH_DATA_FORMAT
 386 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE,GLOBAL)  DW_EH_PE_absptr
 387 #endif
 388
 389 /* By default, the C++ compiler will use the lowest bit of the pointer
 390    to function to indicate a pointer-to-member-function points to a
 391    virtual member function.  However, if FUNCTION_BOUNDARY indicates
 392    function addresses aren't always even, the lowest bit of the delta
 393    field will be used.  */
 394 #ifndef TARGET_PTRMEMFUNC_VBIT_LOCATION
 395 #define TARGET_PTRMEMFUNC_VBIT_LOCATION \
 396   (FUNCTION_BOUNDARY >= 2 * BITS_PER_UNIT \
 397    ? ptrmemfunc_vbit_in_pfn : ptrmemfunc_vbit_in_delta)
 398 #endif
 399
 400 /* True if it is possible to profile code that does not have a frame
 401    pointer.  */
 402
 403 #ifndef TARGET_ALLOWS_PROFILING_WITHOUT_FRAME_POINTER
 404 #define TARGET_ALLOWS_PROFILING_WITHOUT_FRAME_POINTER true
 405 #endif
 406
 407 #ifndef DEFAULT_GDB_EXTENSIONS
 408 #define DEFAULT_GDB_EXTENSIONS 1
 409 #endif
 410
 411 /* If more than one debugging type is supported, you must define
 412    PREFERRED_DEBUGGING_TYPE to choose a format in a system-dependent way.
 413
 414    This is one long line cause VAXC can't handle a \-newline.  */
 415 #if 1 < (defined (DBX_DEBUGGING_INFO) + defined (SDB_DEBUGGING_INFO) + defined (DWARF_DEBUGGING_INFO) + defined (DWARF2_DEBUGGING_INFO) + defined (XCOFF_DEBUGGING_INFO) + defined (VMS_DEBUGGING_INFO))
 416 #ifndef PREFERRED_DEBUGGING_TYPE
 417 You Lose!  You must define PREFERRED_DEBUGGING_TYPE!
 418 #endif /* no PREFERRED_DEBUGGING_TYPE */
 419 #else /* Only one debugging format supported.  Define PREFERRED_DEBUGGING_TYPE
 420          so other code needn't care.  */
 421 #ifdef DBX_DEBUGGING_INFO
 422 #define PREFERRED_DEBUGGING_TYPE DBX_DEBUG
 423 #endif
 424 #ifdef SDB_DEBUGGING_INFO
 425 #define PREFERRED_DEBUGGING_TYPE SDB_DEBUG
 426 #endif
 427 #ifdef DWARF_DEBUGGING_INFO
 428 #define PREFERRED_DEBUGGING_TYPE DWARF_DEBUG
 429 #endif
 430 #ifdef DWARF2_DEBUGGING_INFO
 431 #define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
 432 #endif
 433 #ifdef VMS_DEBUGGING_INFO
 434 #define PREFERRED_DEBUGGING_TYPE VMS_AND_DWARF2_DEBUG
 435 #endif
 436 #ifdef XCOFF_DEBUGGING_INFO
 437 #define PREFERRED_DEBUGGING_TYPE XCOFF_DEBUG
 438 #endif
 439 #endif /* More than one debugger format enabled.  */
 440
 441 /* If still not defined, must have been because no debugging formats
 442    are supported.  */
 443 #ifndef PREFERRED_DEBUGGING_TYPE
 444 #define PREFERRED_DEBUGGING_TYPE NO_DEBUG
 445 #endif
 446
 447 /* This is set to 1 if BYTES_BIG_ENDIAN is defined but the target uses a
 448    little-endian method of passing and returning structures in registers.
 449    On the HP-UX IA64 and PA64 platforms structures are aligned differently
 450    then integral values and setting this value to 1 will allow for the
 451    special handling of structure arguments and return values in regs.  */
 452
 453 #ifndef FUNCTION_ARG_REG_LITTLE_ENDIAN
 454 #define FUNCTION_ARG_REG_LITTLE_ENDIAN 0
 455 #endif
 456
 457 /* Determine the register class for registers suitable to be the base
 458    address register in a MEM.  Allow the choice to be dependent upon
 459    the mode of the memory access.  */
 460 #ifndef MODE_BASE_REG_CLASS
 461 #define MODE_BASE_REG_CLASS(MODE) BASE_REG_CLASS
 462 #endif
 463
 464 #ifndef LARGEST_EXPONENT_IS_NORMAL
 465 #define LARGEST_EXPONENT_IS_NORMAL(SIZE) 0
 466 #endif
 467
 468 #ifndef ROUND_TOWARDS_ZERO
 469 #define ROUND_TOWARDS_ZERO 0
 470 #endif
 471
 472 #ifndef MODE_HAS_NANS
 473 #define MODE_HAS_NANS(MODE)                                     \
 474   (FLOAT_MODE_P (MODE)                                          \
 475    && TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT                  \
 476    && !LARGEST_EXPONENT_IS_NORMAL (GET_MODE_BITSIZE (MODE)))
 477 #endif
 478
 479 #ifndef MODE_HAS_INFINITIES
 480 #define MODE_HAS_INFINITIES(MODE)                               \
 481   (FLOAT_MODE_P (MODE)                                          \
 482    && TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT                  \
 483    && !LARGEST_EXPONENT_IS_NORMAL (GET_MODE_BITSIZE (MODE)))
 484 #endif
 485
 486 #ifndef MODE_HAS_SIGNED_ZEROS
 487 #define MODE_HAS_SIGNED_ZEROS(MODE) \
 488   (FLOAT_MODE_P (MODE) && TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT)
 489 #endif
 490
 491 #ifndef MODE_HAS_SIGN_DEPENDENT_ROUNDING
 492 #define MODE_HAS_SIGN_DEPENDENT_ROUNDING(MODE)                  \
 493   (FLOAT_MODE_P (MODE)                                          \
 494    && TARGET_FLOAT_FORMAT == IEEE_FLOAT_FORMAT                  \
 495    && !ROUND_TOWARDS_ZERO)
 496 #endif
 497
 498 #ifndef HOT_TEXT_SECTION_NAME
 499 #define HOT_TEXT_SECTION_NAME "text.hot"
 500 #endif
 501
 502 #ifndef UNLIKELY_EXECUTED_TEXT_SECTION_NAME
 503 #define UNLIKELY_EXECUTED_TEXT_SECTION_NAME "text.unlikely"
 504 #endif
 505
 506 #endif  /* ! GCC_DEFAULTS_H */