gcc/defaults.h

   1 /* Definitions of various defaults for tm.h macros.
   2    Copyright (C) 1992, 1996, 1997, 1998, 1999, 2000, 2001
   3    Free Software Foundation, Inc.
   4    Contributed by Ron Guilmette (rfg@monkeys.com)
   5
   6 This file is part of GNU CC.
   7
   8 GNU CC is free software; you can redistribute it and/or modify
   9 it under the terms of the GNU General Public License as published by
  10 the Free Software Foundation; either version 2, or (at your option)
  11 any later version.
  12
  13 GNU CC is distributed in the hope that it will be useful,
  14 but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 GNU General Public License for more details.
  17
  18 You should have received a copy of the GNU General Public License
  19 along with GNU CC; see the file COPYING.  If not, write to
  20 the Free Software Foundation, 59 Temple Place - Suite 330,
  21 Boston, MA 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 { fprintf (FILE, "\t%s\t", ASM_LONG);                                \
  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           register 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 #ifdef ASM_WEAKEN_LABEL
 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 defined (DWARF2_UNWIND_INFO) && !defined (EH_FRAME_SECTION)
 213 # if defined (EH_FRAME_SECTION_ASM_OP)
 214 #  define EH_FRAME_SECTION() eh_frame_section ()
 215 # else
 216    /* If we aren't using crtstuff to run ctors, don't use it for EH.  */
 217 #  if defined (ASM_OUTPUT_SECTION_NAME) && defined (ASM_OUTPUT_CONSTRUCTOR)
 218 #   define EH_FRAME_SECTION_ASM_OP      "\t.section\t.eh_frame,\"aw\""
 219 #   define EH_FRAME_SECTION() \
 220      do { named_section (NULL_TREE, ".eh_frame", 0); } while (0)
 221 #  endif
 222 # endif
 223 #endif
 224
 225 /* If we have no definition for UNIQUE_SECTION, but do have the
 226    ability to generate arbitrary sections, construct something
 227    reasonable.  */
 228 #ifdef ASM_OUTPUT_SECTION_NAME
 229 #ifndef UNIQUE_SECTION
 230 #define UNIQUE_SECTION(DECL,RELOC)                              \
 231 do {                                                            \
 232   int len;                                                      \
 233   const char *name;                                             \
 234   char *string;                                                 \
 235                                                                 \
 236   name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (DECL));       \
 237   /* Strip off any encoding in name.  */                        \
 238   STRIP_NAME_ENCODING (name, name);                             \
 239                                                                 \
 240   len = strlen (name) + 1;                                      \
 241   string = alloca (len + 1);                                    \
 242   sprintf (string, ".%s", name);                                \
 243                                                                 \
 244   DECL_SECTION_NAME (DECL) = build_string (len, string);        \
 245 } while (0)
 246 #endif
 247 #ifndef UNIQUE_SECTION_P
 248 #define UNIQUE_SECTION_P(DECL) 0
 249 #endif
 250 #endif
 251
 252 /* By default, we generate a label at the beginning and end of the
 253    text section, and compute the size of the text section by
 254    subtracting the two.  However, on some platforms that doesn't
 255    work, and we use the section itself, rather than a label at the
 256    beginning of it, to indicate the start of the section.  On such
 257    platforms, define this to zero.  */
 258 #ifndef DWARF2_GENERATE_TEXT_SECTION_LABEL
 259 #define DWARF2_GENERATE_TEXT_SECTION_LABEL 1
 260 #endif
 261
 262 /* Supply a default definition for PROMOTE_PROTOTYPES.  */
 263 #ifndef PROMOTE_PROTOTYPES
 264 #define PROMOTE_PROTOTYPES      0
 265 #endif
 266
 267 /* Number of hardware registers that go into the DWARF-2 unwind info.
 268    If not defined, equals FIRST_PSEUDO_REGISTER  */
 269
 270 #ifndef DWARF_FRAME_REGISTERS
 271 #define DWARF_FRAME_REGISTERS FIRST_PSEUDO_REGISTER
 272 #endif
 273
 274 /* Default sizes for base C types.  If the sizes are different for
 275    your target, you should override these values by defining the
 276    appropriate symbols in your tm.h file.  */
 277
 278 #ifndef CHAR_TYPE_SIZE
 279 #define CHAR_TYPE_SIZE BITS_PER_UNIT
 280 #endif
 281
 282 #ifndef SHORT_TYPE_SIZE
 283 #define SHORT_TYPE_SIZE (BITS_PER_UNIT * MIN ((UNITS_PER_WORD + 1) / 2, 2))
 284 #endif
 285
 286 #ifndef INT_TYPE_SIZE
 287 #define INT_TYPE_SIZE BITS_PER_WORD
 288 #endif
 289
 290 #ifndef LONG_TYPE_SIZE
 291 #define LONG_TYPE_SIZE BITS_PER_WORD
 292 #endif
 293
 294 #ifndef LONG_LONG_TYPE_SIZE
 295 #define LONG_LONG_TYPE_SIZE (BITS_PER_WORD * 2)
 296 #endif
 297
 298 #ifndef WCHAR_TYPE_SIZE
 299 #define WCHAR_TYPE_SIZE INT_TYPE_SIZE
 300 #endif
 301
 302 #ifndef WCHAR_UNSIGNED
 303 #define WCHAR_UNSIGNED 0
 304 #endif
 305
 306 #ifndef FLOAT_TYPE_SIZE
 307 #define FLOAT_TYPE_SIZE BITS_PER_WORD
 308 #endif
 309
 310 #ifndef DOUBLE_TYPE_SIZE
 311 #define DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
 312 #endif
 313
 314 #ifndef LONG_DOUBLE_TYPE_SIZE
 315 #define LONG_DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
 316 #endif
 317
 318 #ifndef BUILD_VA_LIST_TYPE
 319 #define BUILD_VA_LIST_TYPE(X) ((X) = ptr_type_node)
 320 #endif
 321
 322 #ifndef PIC_OFFSET_TABLE_REGNUM
 323 #define PIC_OFFSET_TABLE_REGNUM INVALID_REGNUM
 324 #endif
 325
 326 /* Type used by GCOV counters.  Use 64bit data type if target supports
 327    it.  */
 328 #if LONG_TYPE_SIZE >= 64
 329 #define GCOV_TYPE_SIZE LONG_TYPE_SIZE
 330 #else
 331 #define GCOV_TYPE_SIZE LONG_LONG_TYPE_SIZE
 332 #endif
 333
 334
 335 /* By default, the preprocessor should be invoked the same way in C++
 336    as in C.  */
 337 #ifndef CPLUSPLUS_CPP_SPEC
 338 #ifdef CPP_SPEC
 339 #define CPLUSPLUS_CPP_SPEC CPP_SPEC
 340 #endif
 341 #endif
 342
 343 #ifndef ACCUMULATE_OUTGOING_ARGS
 344 #define ACCUMULATE_OUTGOING_ARGS 0
 345 #endif
 346
 347 /* Supply a default definition for PUSH_ARGS.  */
 348 #ifndef PUSH_ARGS
 349 #ifdef PUSH_ROUNDING
 350 #define PUSH_ARGS       !ACCUMULATE_OUTGOING_ARGS
 351 #else
 352 #define PUSH_ARGS       0
 353 #endif
 354 #endif
 355
 356 /* Select a format to encode pointers in exception handling data.  We
 357    prefer those that result in fewer dynamic relocations.  Assume no
 358    special support here and encode direct references.  */
 359 #ifndef ASM_PREFERRED_EH_DATA_FORMAT
 360 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE,GLOBAL)  DW_EH_PE_absptr
 361 #endif
 362
 363 /* By default, the C++ compiler will use the lowest bit of the pointer
 364    to function to indicate a pointer-to-member-function points to a
 365    virtual member function.  However, if FUNCTION_BOUNDARY indicates
 366    function addresses aren't always even, the lowest bit of the delta
 367    field will be used.  */
 368 #ifndef TARGET_PTRMEMFUNC_VBIT_LOCATION
 369 #define TARGET_PTRMEMFUNC_VBIT_LOCATION \
 370   (FUNCTION_BOUNDARY >= 2 * BITS_PER_UNIT \
 371    ? ptrmemfunc_vbit_in_pfn : ptrmemfunc_vbit_in_delta)
 372 #endif
 373
 374 /* True if it is possible to profile code that does not have a frame
 375    pointer.  */
 376
 377 #ifndef TARGET_ALLOWS_PROFILING_WITHOUT_FRAME_POINTER
 378 #define TARGET_ALLOWS_PROFILING_WITHOUT_FRAME_POINTER true
 379 #endif
 380
 381 #endif  /* ! GCC_DEFAULTS_H */