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 /* Store in OUTPUT a string (made with alloca) containing
  27    an assembler-name for a local static variable or function named NAME.
  28    LABELNO is an integer which is different for each call.  */
  29
  30 #ifndef ASM_FORMAT_PRIVATE_NAME
  31 #define ASM_FORMAT_PRIVATE_NAME(OUTPUT, NAME, LABELNO)                  \
  32   do {                                                                  \
  33     int len = strlen (NAME);                                            \
  34     char *temp = (char *) alloca (len + 3);                             \
  35     temp[0] = 'L';                                                      \
  36     strcpy (&temp[1], (NAME));                                          \
  37     temp[len + 1] = '.';                                                \
  38     temp[len + 2] = 0;                                                  \
  39     (OUTPUT) = (char *) alloca (strlen (NAME) + 11);                    \
  40     ASM_GENERATE_INTERNAL_LABEL (OUTPUT, temp, LABELNO);                \
  41   } while (0)
  42 #endif
  43
  44 #ifndef ASM_STABD_OP
  45 #define ASM_STABD_OP "\t.stabd\t"
  46 #endif
  47
  48 /* This is how to output an element of a case-vector that is absolute.
  49    Some targets don't use this, but we have to define it anyway.  */
  50
  51 #ifndef ASM_OUTPUT_ADDR_VEC_ELT
  52 #define ASM_OUTPUT_ADDR_VEC_ELT(FILE, VALUE)  \
  53 do { fprintf (FILE, "\t%s\t", ASM_LONG);                                \
  54      ASM_OUTPUT_INTERNAL_LABEL (FILE, "L", (VALUE));                    \
  55      fputc ('\n', FILE);                                                \
  56    } while (0)
  57 #endif
  58
  59 /* Provide default for ASM_OUTPUT_ALTERNATE_LABEL_NAME.  */
  60 #ifndef ASM_OUTPUT_ALTERNATE_LABEL_NAME
  61 #define ASM_OUTPUT_ALTERNATE_LABEL_NAME(FILE,INSN) \
  62 do { ASM_OUTPUT_LABEL(FILE,LABEL_ALTERNATE_NAME (INSN)); } while (0)
  63 #endif
  64
  65 /* choose a reasonable default for ASM_OUTPUT_ASCII.  */
  66
  67 #ifndef ASM_OUTPUT_ASCII
  68 #define ASM_OUTPUT_ASCII(MYFILE, MYSTRING, MYLENGTH) \
  69   do {                                                                        \
  70     FILE *_hide_asm_out_file = (MYFILE);                                      \
  71     const unsigned char *_hide_p = (const unsigned char *) (MYSTRING);        \
  72     int _hide_thissize = (MYLENGTH);                                          \
  73     {                                                                         \
  74       FILE *asm_out_file = _hide_asm_out_file;                                \
  75       const unsigned char *p = _hide_p;                                       \
  76       int thissize = _hide_thissize;                                          \
  77       int i;                                                                  \
  78       fprintf (asm_out_file, "\t.ascii \"");                                  \
  79                                                                               \
  80       for (i = 0; i < thissize; i++)                                          \
  81         {                                                                     \
  82           register int c = p[i];                                              \
  83           if (c == '\"' || c == '\\')                                         \
  84             putc ('\\', asm_out_file);                                        \
  85           if (ISPRINT(c))                                                     \
  86             putc (c, asm_out_file);                                           \
  87           else                                                                \
  88             {                                                                 \
  89               fprintf (asm_out_file, "\\%o", c);                              \
  90               /* After an octal-escape, if a digit follows,                   \
  91                  terminate one string constant and start another.             \
  92                  The Vax assembler fails to stop reading the escape           \
  93                  after three digits, so this is the only way we               \
  94                  can get it to parse the data properly.  */                   \
  95               if (i < thissize - 1 && ISDIGIT(p[i + 1]))                      \
  96                 fprintf (asm_out_file, "\"\n\t.ascii \"");                    \
  97           }                                                                   \
  98         }                                                                     \
  99       fprintf (asm_out_file, "\"\n");                                         \
 100     }                                                                         \
 101   }                                                                           \
 102   while (0)
 103 #endif
 104
 105 /* This is how we tell the assembler to equate two values.  */
 106 #ifdef SET_ASM_OP
 107 #ifndef ASM_OUTPUT_DEF
 108 #define ASM_OUTPUT_DEF(FILE,LABEL1,LABEL2)                              \
 109  do {   fprintf ((FILE), "%s", SET_ASM_OP);                             \
 110         assemble_name (FILE, LABEL1);                                   \
 111         fprintf (FILE, ",");                                            \
 112         assemble_name (FILE, LABEL2);                                   \
 113         fprintf (FILE, "\n");                                           \
 114   } while (0)
 115 #endif
 116 #endif
 117
 118 /* This is how to output a reference to a user-level label named NAME.  */
 119
 120 #ifndef ASM_OUTPUT_LABELREF
 121 #define ASM_OUTPUT_LABELREF(FILE,NAME)  asm_fprintf ((FILE), "%U%s", (NAME))
 122 #endif
 123
 124 /* Allow target to print debug info labels specially.  This is useful for
 125    VLIW targets, since debug info labels should go into the middle of
 126    instruction bundles instead of breaking them.  */
 127
 128 #ifndef ASM_OUTPUT_DEBUG_LABEL
 129 #define ASM_OUTPUT_DEBUG_LABEL(FILE, PREFIX, NUM) \
 130   ASM_OUTPUT_INTERNAL_LABEL (FILE, PREFIX, NUM)
 131 #endif
 132
 133 /* This is how we tell the assembler that a symbol is weak.  */
 134 #ifndef ASM_OUTPUT_WEAK_ALIAS
 135 #if defined (ASM_WEAKEN_LABEL) && defined (ASM_OUTPUT_DEF)
 136 #define ASM_OUTPUT_WEAK_ALIAS(STREAM, NAME, VALUE)      \
 137   do                                                    \
 138     {                                                   \
 139       ASM_WEAKEN_LABEL (STREAM, NAME);                  \
 140       if (VALUE)                                        \
 141         ASM_OUTPUT_DEF (STREAM, NAME, VALUE);           \
 142     }                                                   \
 143   while (0)
 144 #endif
 145 #endif
 146
 147 /* This determines whether or not we support weak symbols.  */
 148 #ifndef SUPPORTS_WEAK
 149 #ifdef ASM_WEAKEN_LABEL
 150 #define SUPPORTS_WEAK 1
 151 #else
 152 #define SUPPORTS_WEAK 0
 153 #endif
 154 #endif
 155
 156 /* This determines whether or not we support link-once semantics.  */
 157 #ifndef SUPPORTS_ONE_ONLY
 158 #ifdef MAKE_DECL_ONE_ONLY
 159 #define SUPPORTS_ONE_ONLY 1
 160 #else
 161 #define SUPPORTS_ONE_ONLY 0
 162 #endif
 163 #endif
 164
 165 /* If the target supports weak symbols, define TARGET_ATTRIBUTE_WEAK to
 166    provide a weak attribute.  Else define it to nothing.
 167
 168    This would normally belong in gansidecl.h, but SUPPORTS_WEAK is
 169    not available at that time.
 170
 171    Note, this is only for use by target files which we know are to be
 172    compiled by GCC.  */
 173 #ifndef TARGET_ATTRIBUTE_WEAK
 174 # if SUPPORTS_WEAK
 175 #  define TARGET_ATTRIBUTE_WEAK __attribute__ ((weak))
 176 # else
 177 #  define TARGET_ATTRIBUTE_WEAK
 178 # endif
 179 #endif
 180
 181 /* If the target supports init_priority C++ attribute, give
 182    SUPPORTS_INIT_PRIORITY a nonzero value.  */
 183 #ifndef SUPPORTS_INIT_PRIORITY
 184 #define SUPPORTS_INIT_PRIORITY 1
 185 #endif /* SUPPORTS_INIT_PRIORITY */
 186
 187 /* If duplicate library search directories can be removed from a
 188    linker command without changing the linker's semantics, give this
 189    symbol a nonzero.  */
 190 #ifndef LINK_ELIMINATE_DUPLICATE_LDIRECTORIES
 191 #define LINK_ELIMINATE_DUPLICATE_LDIRECTORIES 0
 192 #endif /* LINK_ELIMINATE_DUPLICATE_LDIRECTORIES */
 193
 194 /* If we have a definition of INCOMING_RETURN_ADDR_RTX, assume that
 195    the rest of the DWARF 2 frame unwind support is also provided.  */
 196 #if !defined (DWARF2_UNWIND_INFO) && defined (INCOMING_RETURN_ADDR_RTX)
 197 #define DWARF2_UNWIND_INFO 1
 198 #endif
 199
 200 #if defined (DWARF2_UNWIND_INFO) && !defined (EH_FRAME_SECTION)
 201 # if defined (EH_FRAME_SECTION_ASM_OP)
 202 #  define EH_FRAME_SECTION() eh_frame_section ()
 203 # else
 204    /* If we aren't using crtstuff to run ctors, don't use it for EH.  */
 205 #  if defined (ASM_OUTPUT_SECTION_NAME) && defined (ASM_OUTPUT_CONSTRUCTOR)
 206 #   define EH_FRAME_SECTION_ASM_OP      "\t.section\t.eh_frame,\"aw\""
 207 #   define EH_FRAME_SECTION() \
 208      do { named_section (NULL_TREE, ".eh_frame", 0); } while (0)
 209 #  endif
 210 # endif
 211 #endif
 212
 213 /* If we have no definition for UNIQUE_SECTION, but do have the
 214    ability to generate arbitrary sections, construct something
 215    reasonable.  */
 216 #ifdef ASM_OUTPUT_SECTION_NAME
 217 #ifndef UNIQUE_SECTION
 218 #define UNIQUE_SECTION(DECL,RELOC)                              \
 219 do {                                                            \
 220   int len;                                                      \
 221   const char *name;                                             \
 222   char *string;                                                 \
 223                                                                 \
 224   name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (DECL));       \
 225   /* Strip off any encoding in name.  */                        \
 226   STRIP_NAME_ENCODING (name, name);                             \
 227                                                                 \
 228   len = strlen (name) + 1;                                      \
 229   string = alloca (len + 1);                                    \
 230   sprintf (string, ".%s", name);                                \
 231                                                                 \
 232   DECL_SECTION_NAME (DECL) = build_string (len, string);        \
 233 } while (0)
 234 #endif
 235 #ifndef UNIQUE_SECTION_P
 236 #define UNIQUE_SECTION_P(DECL) 0
 237 #endif
 238 #endif
 239
 240 /* By default, we generate a label at the beginning and end of the
 241    text section, and compute the size of the text section by
 242    subtracting the two.  However, on some platforms that doesn't
 243    work, and we use the section itself, rather than a label at the
 244    beginning of it, to indicate the start of the section.  On such
 245    platforms, define this to zero.  */
 246 #ifndef DWARF2_GENERATE_TEXT_SECTION_LABEL
 247 #define DWARF2_GENERATE_TEXT_SECTION_LABEL 1
 248 #endif
 249
 250 /* Supply a default definition for PROMOTE_PROTOTYPES.  */
 251 #ifndef PROMOTE_PROTOTYPES
 252 #define PROMOTE_PROTOTYPES      0
 253 #endif
 254
 255 /* Number of hardware registers that go into the DWARF-2 unwind info.
 256    If not defined, equals FIRST_PSEUDO_REGISTER  */
 257
 258 #ifndef DWARF_FRAME_REGISTERS
 259 #define DWARF_FRAME_REGISTERS FIRST_PSEUDO_REGISTER
 260 #endif
 261
 262 /* Default sizes for base C types.  If the sizes are different for
 263    your target, you should override these values by defining the
 264    appropriate symbols in your tm.h file.  */
 265
 266 #ifndef CHAR_TYPE_SIZE
 267 #define CHAR_TYPE_SIZE BITS_PER_UNIT
 268 #endif
 269
 270 #ifndef SHORT_TYPE_SIZE
 271 #define SHORT_TYPE_SIZE (BITS_PER_UNIT * MIN ((UNITS_PER_WORD + 1) / 2, 2))
 272 #endif
 273
 274 #ifndef INT_TYPE_SIZE
 275 #define INT_TYPE_SIZE BITS_PER_WORD
 276 #endif
 277
 278 #ifndef LONG_TYPE_SIZE
 279 #define LONG_TYPE_SIZE BITS_PER_WORD
 280 #endif
 281
 282 #ifndef LONG_LONG_TYPE_SIZE
 283 #define LONG_LONG_TYPE_SIZE (BITS_PER_WORD * 2)
 284 #endif
 285
 286 #ifndef WCHAR_TYPE_SIZE
 287 #define WCHAR_TYPE_SIZE INT_TYPE_SIZE
 288 #endif
 289
 290 #ifndef WCHAR_UNSIGNED
 291 #define WCHAR_UNSIGNED 0
 292 #endif
 293
 294 #ifndef FLOAT_TYPE_SIZE
 295 #define FLOAT_TYPE_SIZE BITS_PER_WORD
 296 #endif
 297
 298 #ifndef DOUBLE_TYPE_SIZE
 299 #define DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
 300 #endif
 301
 302 #ifndef LONG_DOUBLE_TYPE_SIZE
 303 #define LONG_DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
 304 #endif
 305
 306 #ifndef BUILD_VA_LIST_TYPE
 307 #define BUILD_VA_LIST_TYPE(X) ((X) = ptr_type_node)
 308 #endif
 309
 310 /* By default, the preprocessor should be invoked the same way in C++
 311    as in C.  */
 312 #ifndef CPLUSPLUS_CPP_SPEC
 313 #ifdef CPP_SPEC
 314 #define CPLUSPLUS_CPP_SPEC CPP_SPEC
 315 #endif
 316 #endif
 317
 318 /* By default, the C++ compiler will use the lowest bit of the pointer
 319    to function to indicate a pointer-to-member-function points to a
 320    virtual member function.  However, if FUNCTION_BOUNDARY indicates
 321    function addresses aren't always even, the lowest bit of the delta
 322    field will be used.  */
 323 #ifndef TARGET_PTRMEMFUNC_VBIT_LOCATION
 324 #define TARGET_PTRMEMFUNC_VBIT_LOCATION \
 325   (FUNCTION_BOUNDARY >= 2 * BITS_PER_UNIT \
 326    ? ptrmemfunc_vbit_in_pfn : ptrmemfunc_vbit_in_delta)
 327 #endif
 328
 329 /* By default, the C++ compiler will use function addresses in the
 330    vtable entries.  Setting this non-zero tells the compiler to use
 331    function descriptors instead.  The value of this macro says how
 332    many words wide the descriptor is (normally 2).  It is assumed
 333    that the address of a function descriptor may be treated as a
 334    pointer to a function.  */
 335 #ifndef TARGET_VTABLE_USES_DESCRIPTORS
 336 #define TARGET_VTABLE_USES_DESCRIPTORS 0
 337 #endif
 338
 339 /* Select a format to encode pointers in exception handling data.  We
 340    prefer those that result in fewer dynamic relocations.  Assume no
 341    special support here and encode direct references.  */
 342 #ifndef ASM_PREFERRED_EH_DATA_FORMAT
 343 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE,GLOBAL)  DW_EH_PE_absptr
 344 #endif
 345
 346 /* True if it is possible to profile code that does not have a frame
 347    pointer.  */
 348
 349 #ifndef TARGET_ALLOWS_PROFILING_WITHOUT_FRAME_POINTER
 350 #define TARGET_ALLOWS_PROFILING_WITHOUT_FRAME_POINTER true
 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 #endif  /* GCC_DEFAULTS_H */
 367