gcc/defaults.h

   1 /* Definitions of various defaults for how to do assembler output
   2    (most of which are designed to be appropriate for GAS or for
   3    some BSD assembler).
   4    Copyright (C) 1992, 1996-1999 Free Software Foundation, Inc.
   5    Contributed by Ron Guilmette (rfg@monkeys.com)
   6
   7 This file is part of GNU CC.
   8
   9 GNU CC is free software; you can redistribute it and/or modify
  10 it under the terms of the GNU General Public License as published by
  11 the Free Software Foundation; either version 2, or (at your option)
  12 any later version.
  13
  14 GNU CC is distributed in the hope that it will be useful,
  15 but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 GNU General Public License for more details.
  18
  19 You should have received a copy of the GNU General Public License
  20 along with GNU CC; see the file COPYING.  If not, write to
  21 the Free Software Foundation, 59 Temple Place - Suite 330,
  22 Boston, MA 02111-1307, USA.  */
  23
  24 /* Store in OUTPUT a string (made with alloca) containing
  25    an assembler-name for a local static variable or function named NAME.
  26    LABELNO is an integer which is different for each call.  */
  27
  28 #ifndef ASM_FORMAT_PRIVATE_NAME
  29 #define ASM_FORMAT_PRIVATE_NAME(OUTPUT, NAME, LABELNO)                  \
  30   do {                                                                  \
  31     int len = strlen (NAME);                                            \
  32     char *temp = (char *) alloca (len + 3);                             \
  33     temp[0] = 'L';                                                      \
  34     strcpy (&temp[1], (NAME));                                          \
  35     temp[len + 1] = '.';                                                \
  36     temp[len + 2] = 0;                                                  \
  37     (OUTPUT) = (char *) alloca (strlen (NAME) + 11);                    \
  38     ASM_GENERATE_INTERNAL_LABEL (OUTPUT, temp, LABELNO);                \
  39   } while (0)
  40 #endif
  41
  42 #ifndef ASM_STABD_OP
  43 #define ASM_STABD_OP ".stabd"
  44 #endif
  45
  46 /* This is how to output an element of a case-vector that is absolute.
  47    Some targets don't use this, but we have to define it anyway.  */
  48
  49 #ifndef ASM_OUTPUT_ADDR_VEC_ELT
  50 #define ASM_OUTPUT_ADDR_VEC_ELT(FILE, VALUE)  \
  51 do { fprintf (FILE, "\t%s\t", ASM_LONG);                                \
  52      ASM_OUTPUT_INTERNAL_LABEL (FILE, "L", (VALUE));                    \
  53      fputc ('\n', FILE);                                                \
  54    } while (0)
  55 #endif
  56
  57 /* Provide default for ASM_OUTPUT_ALTERNATE_LABEL_NAME.  */
  58 #ifndef ASM_OUTPUT_ALTERNATE_LABEL_NAME
  59 #define ASM_OUTPUT_ALTERNATE_LABEL_NAME(FILE,INSN) \
  60 do { ASM_OUTPUT_LABEL(FILE,LABEL_ALTERNATE_NAME (INSN)); } while (0)
  61 #endif
  62
  63 /* choose a reasonable default for ASM_OUTPUT_ASCII.  */
  64
  65 #ifndef ASM_OUTPUT_ASCII
  66 #define ASM_OUTPUT_ASCII(MYFILE, MYSTRING, MYLENGTH) \
  67   do {                                                                        \
  68     FILE *_hide_asm_out_file = (MYFILE);                                      \
  69     unsigned char *_hide_p = (unsigned char *) (MYSTRING);                    \
  70     int _hide_thissize = (MYLENGTH);                                          \
  71     {                                                                         \
  72       FILE *asm_out_file = _hide_asm_out_file;                                \
  73       unsigned char *p = _hide_p;                                             \
  74       int thissize = _hide_thissize;                                          \
  75       int i;                                                                  \
  76       fprintf (asm_out_file, "\t.ascii \"");                                  \
  77                                                                               \
  78       for (i = 0; i < thissize; i++)                                          \
  79         {                                                                     \
  80           register int c = p[i];                                              \
  81           if (c == '\"' || c == '\\')                                         \
  82             putc ('\\', asm_out_file);                                        \
  83           if (c >= ' ' && c < 0177)                                           \
  84             putc (c, asm_out_file);                                           \
  85           else                                                                \
  86             {                                                                 \
  87               fprintf (asm_out_file, "\\%o", c);                              \
  88               /* After an octal-escape, if a digit follows,                   \
  89                  terminate one string constant and start another.             \
  90                  The Vax assembler fails to stop reading the escape           \
  91                  after three digits, so this is the only way we               \
  92                  can get it to parse the data properly.  */                   \
  93               if (i < thissize - 1 && ISDIGIT(p[i + 1]))                      \
  94                 fprintf (asm_out_file, "\"\n\t.ascii \"");                    \
  95           }                                                                   \
  96         }                                                                     \
  97       fprintf (asm_out_file, "\"\n");                                         \
  98     }                                                                         \
  99   }                                                                           \
 100   while (0)
 101 #endif
 102
 103 #ifndef ASM_IDENTIFY_GCC
 104   /* Default the definition, only if ASM_IDENTIFY_GCC is not set,
 105      because if it is set, we might not want ASM_IDENTIFY_LANGUAGE
 106      outputting labels, if we do want it to, then it must be defined
 107      in the tm.h file.  */
 108 #ifndef ASM_IDENTIFY_LANGUAGE
 109 #define ASM_IDENTIFY_LANGUAGE(FILE) output_lang_identify (FILE);
 110 #endif
 111 #endif
 112
 113 /* This is how we tell the assembler to equate two values.  */
 114 #ifdef SET_ASM_OP
 115 #ifndef ASM_OUTPUT_DEF
 116 #define ASM_OUTPUT_DEF(FILE,LABEL1,LABEL2)                              \
 117  do {   fprintf ((FILE), "\t%s\t", SET_ASM_OP);                         \
 118         assemble_name (FILE, LABEL1);                                   \
 119         fprintf (FILE, ",");                                            \
 120         assemble_name (FILE, LABEL2);                                   \
 121         fprintf (FILE, "\n");                                           \
 122   } while (0)
 123 #endif
 124 #endif
 125
 126 /* This is how to output a reference to a user-level label named NAME.  */
 127
 128 #ifndef ASM_OUTPUT_LABELREF
 129 #define ASM_OUTPUT_LABELREF(FILE,NAME)  asm_fprintf ((FILE), "%U%s", (NAME))
 130 #endif
 131
 132 /* This determines whether or not we support weak symbols.  */
 133 #ifndef SUPPORTS_WEAK
 134 #ifdef ASM_WEAKEN_LABEL
 135 #define SUPPORTS_WEAK 1
 136 #else
 137 #define SUPPORTS_WEAK 0
 138 #endif
 139 #endif
 140
 141 /* If the target supports weak symbols, define TARGET_ATTRIBUTE_WEAK to
 142    provide a weak attribute.  Else define it to nothing.
 143
 144    This would normally belong in gansidecl.h, but SUPPORTS_WEAK is
 145    not available at that time.
 146
 147    Note, this is only for use by target files which we know are to be
 148    compiled by GCC.  */
 149 #ifndef TARGET_ATTRIBUTE_WEAK
 150 # if SUPPORTS_WEAK
 151 #  define TARGET_ATTRIBUTE_WEAK __attribute__ ((weak))
 152 # else
 153 #  define TARGET_ATTRIBUTE_WEAK
 154 # endif
 155 #endif
 156
 157 /* If we have a definition of INCOMING_RETURN_ADDR_RTX, assume that
 158    the rest of the DWARF 2 frame unwind support is also provided.  */
 159 #if !defined (DWARF2_UNWIND_INFO) && defined (INCOMING_RETURN_ADDR_RTX)
 160 #define DWARF2_UNWIND_INFO 1
 161 #endif
 162
 163 #if defined (DWARF2_UNWIND_INFO) && !defined (EH_FRAME_SECTION)
 164 # if defined (EH_FRAME_SECTION_ASM_OP)
 165 #  define EH_FRAME_SECTION() eh_frame_section();
 166 # else
 167    /* If we aren't using crtstuff to run ctors, don't use it for EH.  */
 168 #  if defined (ASM_OUTPUT_SECTION_NAME) && defined (ASM_OUTPUT_CONSTRUCTOR)
 169 #   define EH_FRAME_SECTION_ASM_OP      ".section\t.eh_frame,\"aw\""
 170 #   define EH_FRAME_SECTION() \
 171      do { named_section (NULL_TREE, ".eh_frame", 0); } while (0)
 172 #  endif
 173 # endif
 174 #endif
 175
 176 /* By default, we generate a label at the beginning and end of the
 177    text section, and compute the size of the text section by
 178    subtracting the two.  However, on some platforms that doesn't
 179    work, and we use the section itself, rather than a label at the
 180    beginning of it, to indicate the start of the section.  On such
 181    platforms, define this to zero.  */
 182 #ifndef DWARF2_GENERATE_TEXT_SECTION_LABEL
 183 #define DWARF2_GENERATE_TEXT_SECTION_LABEL 1
 184 #endif
 185
 186 /* Supply a default definition for PROMOTE_PROTOTYPES.  */
 187 #ifndef PROMOTE_PROTOTYPES
 188 #define PROMOTE_PROTOTYPES      0
 189 #endif
 190
 191 /* Number of hardware registers that go into the DWARF-2 unwind info.
 192    If not defined, equals FIRST_PSEUDO_REGISTER  */
 193
 194 #ifndef DWARF_FRAME_REGISTERS
 195 #define DWARF_FRAME_REGISTERS FIRST_PSEUDO_REGISTER
 196 #endif