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 determines whether or not we support weak symbols.  */
 134 #ifndef SUPPORTS_WEAK
 135 #ifdef ASM_WEAKEN_LABEL
 136 #define SUPPORTS_WEAK 1
 137 #else
 138 #define SUPPORTS_WEAK 0
 139 #endif
 140 #endif
 141
 142 /* This determines whether or not we support link-once semantics.  */
 143 #ifndef SUPPORTS_ONE_ONLY
 144 #ifdef MAKE_DECL_ONE_ONLY
 145 #define SUPPORTS_ONE_ONLY 1
 146 #else
 147 #define SUPPORTS_ONE_ONLY 0
 148 #endif
 149 #endif
 150
 151 /* If the target supports weak symbols, define TARGET_ATTRIBUTE_WEAK to
 152    provide a weak attribute.  Else define it to nothing.
 153
 154    This would normally belong in ansidecl.h, but SUPPORTS_WEAK is
 155    not available at that time.
 156
 157    Note, this is only for use by target files which we know are to be
 158    compiled by GCC.  */
 159 #ifndef TARGET_ATTRIBUTE_WEAK
 160 # if SUPPORTS_WEAK
 161 #  define TARGET_ATTRIBUTE_WEAK __attribute__ ((weak))
 162 # else
 163 #  define TARGET_ATTRIBUTE_WEAK
 164 # endif
 165 #endif
 166
 167 /* If the target supports init_priority C++ attribute, give
 168    SUPPORTS_INIT_PRIORITY a nonzero value.  */
 169 #ifndef SUPPORTS_INIT_PRIORITY
 170 #define SUPPORTS_INIT_PRIORITY 1
 171 #endif /* SUPPORTS_INIT_PRIORITY */
 172
 173 /* If duplicate library search directories can be removed from a
 174    linker command without changing the linker's semantics, give this
 175    symbol a nonzero.  */
 176 #ifndef LINK_ELIMINATE_DUPLICATE_LDIRECTORIES
 177 #define LINK_ELIMINATE_DUPLICATE_LDIRECTORIES 0
 178 #endif /* LINK_ELIMINATE_DUPLICATE_LDIRECTORIES */
 179
 180 /* If we have a definition of INCOMING_RETURN_ADDR_RTX, assume that
 181    the rest of the DWARF 2 frame unwind support is also provided.  */
 182 #if !defined (DWARF2_UNWIND_INFO) && defined (INCOMING_RETURN_ADDR_RTX)
 183 #define DWARF2_UNWIND_INFO 1
 184 #endif
 185
 186 #if defined (DWARF2_UNWIND_INFO) && !defined (EH_FRAME_SECTION)
 187 # if defined (EH_FRAME_SECTION_ASM_OP)
 188 #  define EH_FRAME_SECTION() eh_frame_section ()
 189 # else
 190    /* If we aren't using crtstuff to run ctors, don't use it for EH.  */
 191 #  if defined (ASM_OUTPUT_SECTION_NAME) && defined (ASM_OUTPUT_CONSTRUCTOR)
 192 #   define EH_FRAME_SECTION_ASM_OP      "\t.section\t.eh_frame,\"aw\""
 193 #   define EH_FRAME_SECTION() \
 194      do { named_section (NULL_TREE, ".eh_frame", 0); } while (0)
 195 #  endif
 196 # endif
 197 #endif
 198
 199 /* If we have no definition for UNIQUE_SECTION, but do have the
 200    ability to generate arbitrary sections, construct something
 201    reasonable.  */
 202 #ifdef ASM_OUTPUT_SECTION_NAME
 203 #ifndef UNIQUE_SECTION
 204 #define UNIQUE_SECTION(DECL,RELOC)                              \
 205 do {                                                            \
 206   int len;                                                      \
 207   const char *name;                                             \
 208   char *string;                                                 \
 209                                                                 \
 210   name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (DECL));       \
 211   /* Strip off any encoding in name.  */                        \
 212   STRIP_NAME_ENCODING (name, name);                             \
 213                                                                 \
 214   len = strlen (name) + 1;                                      \
 215   string = alloca (len + 1);                                    \
 216   sprintf (string, ".%s", name);                                \
 217                                                                 \
 218   DECL_SECTION_NAME (DECL) = build_string (len, string);        \
 219 } while (0)
 220 #endif
 221 #ifndef UNIQUE_SECTION_P
 222 #define UNIQUE_SECTION_P(DECL) 0
 223 #endif
 224 #endif
 225
 226 /* By default, we generate a label at the beginning and end of the
 227    text section, and compute the size of the text section by
 228    subtracting the two.  However, on some platforms that doesn't
 229    work, and we use the section itself, rather than a label at the
 230    beginning of it, to indicate the start of the section.  On such
 231    platforms, define this to zero.  */
 232 #ifndef DWARF2_GENERATE_TEXT_SECTION_LABEL
 233 #define DWARF2_GENERATE_TEXT_SECTION_LABEL 1
 234 #endif
 235
 236 /* Supply a default definition for PROMOTE_PROTOTYPES.  */
 237 #ifndef PROMOTE_PROTOTYPES
 238 #define PROMOTE_PROTOTYPES      0
 239 #endif
 240
 241 /* Number of hardware registers that go into the DWARF-2 unwind info.
 242    If not defined, equals FIRST_PSEUDO_REGISTER  */
 243
 244 #ifndef DWARF_FRAME_REGISTERS
 245 #define DWARF_FRAME_REGISTERS FIRST_PSEUDO_REGISTER
 246 #endif
 247
 248 /* Default sizes for base C types.  If the sizes are different for
 249    your target, you should override these values by defining the
 250    appropriate symbols in your tm.h file.  */
 251
 252 #ifndef CHAR_TYPE_SIZE
 253 #define CHAR_TYPE_SIZE BITS_PER_UNIT
 254 #endif
 255
 256 #ifndef SHORT_TYPE_SIZE
 257 #define SHORT_TYPE_SIZE (BITS_PER_UNIT * MIN ((UNITS_PER_WORD + 1) / 2, 2))
 258 #endif
 259
 260 #ifndef INT_TYPE_SIZE
 261 #define INT_TYPE_SIZE BITS_PER_WORD
 262 #endif
 263
 264 #ifndef LONG_TYPE_SIZE
 265 #define LONG_TYPE_SIZE BITS_PER_WORD
 266 #endif
 267
 268 #ifndef LONG_LONG_TYPE_SIZE
 269 #define LONG_LONG_TYPE_SIZE (BITS_PER_WORD * 2)
 270 #endif
 271
 272 #ifndef WCHAR_TYPE_SIZE
 273 #define WCHAR_TYPE_SIZE INT_TYPE_SIZE
 274 #endif
 275
 276 #ifndef WCHAR_UNSIGNED
 277 #define WCHAR_UNSIGNED 0
 278 #endif
 279
 280 #ifndef FLOAT_TYPE_SIZE
 281 #define FLOAT_TYPE_SIZE BITS_PER_WORD
 282 #endif
 283
 284 #ifndef DOUBLE_TYPE_SIZE
 285 #define DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
 286 #endif
 287
 288 #ifndef LONG_DOUBLE_TYPE_SIZE
 289 #define LONG_DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
 290 #endif
 291
 292 #ifndef BUILD_VA_LIST_TYPE
 293 #define BUILD_VA_LIST_TYPE(X) ((X) = ptr_type_node)
 294 #endif
 295
 296 #ifndef PIC_OFFSET_TABLE_REGNUM
 297 #define PIC_OFFSET_TABLE_REGNUM INVALID_REGNUM
 298 #endif
 299
 300 /* By default, the preprocessor should be invoked the same way in C++
 301    as in C.  */
 302 #ifndef CPLUSPLUS_CPP_SPEC
 303 #ifdef CPP_SPEC
 304 #define CPLUSPLUS_CPP_SPEC CPP_SPEC
 305 #endif
 306 #endif
 307
 308 #ifndef ACCUMULATE_OUTGOING_ARGS
 309 #define ACCUMULATE_OUTGOING_ARGS 0
 310 #endif
 311
 312 /* Supply a default definition for PUSH_ARGS.  */
 313 #ifndef PUSH_ARGS
 314 #ifdef PUSH_ROUNDING
 315 #define PUSH_ARGS       !ACCUMULATE_OUTGOING_ARGS
 316 #else
 317 #define PUSH_ARGS       0
 318 #endif
 319 #endif
 320
 321 /* Select a format to encode pointers in exception handling data.  We
 322    prefer those that result in fewer dynamic relocations.  Assume no
 323    special support here and encode direct references.  */
 324 #ifndef ASM_PREFERRED_EH_DATA_FORMAT
 325 #define ASM_PREFERRED_EH_DATA_FORMAT(CODE,GLOBAL)  DW_EH_PE_absptr
 326 #endif
 327
 328 /* By default, the C++ compiler will use the lowest bit of the pointer
 329    to function to indicate a pointer-to-member-function points to a
 330    virtual member function.  However, if FUNCTION_BOUNDARY indicates
 331    function addresses aren't always even, the lowest bit of the delta
 332    field will be used.  */
 333 #ifndef TARGET_PTRMEMFUNC_VBIT_LOCATION
 334 #define TARGET_PTRMEMFUNC_VBIT_LOCATION \
 335   (FUNCTION_BOUNDARY >= 2 * BITS_PER_UNIT \
 336    ? ptrmemfunc_vbit_in_pfn : ptrmemfunc_vbit_in_delta)
 337 #endif
 338
 339 #endif  /* GCC_DEFAULTS_H */
 340