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