gcc/defaults.h

/* Definitions of various defaults for tm.h macros.
   Copyright (C) 1992, 1996, 1997, 1998, 1999, 2000, 2001
   Free Software Foundation, Inc.
   Contributed by Ron Guilmette (rfg@monkeys.com)

This file is part of GNU CC.

GNU CC is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.

GNU CC is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with GNU CC; see the file COPYING.  If not, write to
the Free Software Foundation, 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.  */

#ifndef GCC_DEFAULTS_H
#define GCC_DEFAULTS_H

/* Store in OUTPUT a string (made with alloca) containing
   an assembler-name for a local static variable or function named NAME.
   LABELNO is an integer which is different for each call.  */

#ifndef ASM_FORMAT_PRIVATE_NAME
#define ASM_FORMAT_PRIVATE_NAME(OUTPUT, NAME, LABELNO)			\
  do {									\
    int len = strlen (NAME);						\
    char *temp = (char *) alloca (len + 3);				\
    temp[0] = 'L';							\
    strcpy (&temp[1], (NAME));						\
    temp[len + 1] = '.';						\
    temp[len + 2] = 0;							\
    (OUTPUT) = (char *) alloca (strlen (NAME) + 11);			\
    ASM_GENERATE_INTERNAL_LABEL (OUTPUT, temp, LABELNO);		\
  } while (0)
#endif

#ifndef ASM_STABD_OP
#define ASM_STABD_OP "\t.stabd\t"
#endif

/* This is how to output an element of a case-vector that is absolute.
   Some targets don't use this, but we have to define it anyway.  */

#ifndef ASM_OUTPUT_ADDR_VEC_ELT
#define ASM_OUTPUT_ADDR_VEC_ELT(FILE, VALUE)  \
do { fprintf (FILE, "\t%s\t", ASM_LONG);				\
     ASM_OUTPUT_INTERNAL_LABEL (FILE, "L", (VALUE));			\
     fputc ('\n', FILE);						\
   } while (0)
#endif

/* Provide default for ASM_OUTPUT_ALTERNATE_LABEL_NAME.  */
#ifndef ASM_OUTPUT_ALTERNATE_LABEL_NAME
#define ASM_OUTPUT_ALTERNATE_LABEL_NAME(FILE,INSN) \
do { ASM_OUTPUT_LABEL(FILE,LABEL_ALTERNATE_NAME (INSN)); } while (0)
#endif

/* choose a reasonable default for ASM_OUTPUT_ASCII.  */

#ifndef ASM_OUTPUT_ASCII
#define ASM_OUTPUT_ASCII(MYFILE, MYSTRING, MYLENGTH) \
  do {									      \
    FILE *_hide_asm_out_file = (MYFILE);				      \
    const unsigned char *_hide_p = (const unsigned char *) (MYSTRING);	      \
    int _hide_thissize = (MYLENGTH);					      \
    {									      \
      FILE *asm_out_file = _hide_asm_out_file;				      \
      const unsigned char *p = _hide_p;					      \
      int thissize = _hide_thissize;					      \
      int i;								      \
      fprintf (asm_out_file, "\t.ascii \"");				      \
									      \
      for (i = 0; i < thissize; i++)					      \
	{								      \
	  register int c = p[i];					      \
	  if (c == '\"' || c == '\\')					      \
	    putc ('\\', asm_out_file);					      \
	  if (ISPRINT(c))						      \
	    putc (c, asm_out_file);					      \
	  else								      \
	    {								      \
	      fprintf (asm_out_file, "\\%o", c);			      \
	      /* After an octal-escape, if a digit follows,		      \
		 terminate one string constant and start another.	      \
		 The Vax assembler fails to stop reading the escape	      \
		 after three digits, so this is the only way we		      \
		 can get it to parse the data properly.  */		      \
	      if (i < thissize - 1 && ISDIGIT(p[i + 1]))		      \
		fprintf (asm_out_file, "\"\n\t.ascii \"");		      \
	  }								      \
	}								      \
      fprintf (asm_out_file, "\"\n");					      \
    }									      \
  }									      \
  while (0)
#endif

/* This is how we tell the assembler to equate two values.  */
#ifdef SET_ASM_OP
#ifndef ASM_OUTPUT_DEF
#define ASM_OUTPUT_DEF(FILE,LABEL1,LABEL2)				\
 do {	fprintf ((FILE), "%s", SET_ASM_OP);				\
	assemble_name (FILE, LABEL1);					\
	fprintf (FILE, ",");						\
	assemble_name (FILE, LABEL2);					\
	fprintf (FILE, "\n");						\
  } while (0)
#endif
#endif

/* This is how to output a reference to a user-level label named NAME.  */

#ifndef ASM_OUTPUT_LABELREF
#define ASM_OUTPUT_LABELREF(FILE,NAME)  asm_fprintf ((FILE), "%U%s", (NAME))
#endif

/* Allow target to print debug info labels specially.  This is useful for
   VLIW targets, since debug info labels should go into the middle of
   instruction bundles instead of breaking them.  */

#ifndef ASM_OUTPUT_DEBUG_LABEL
#define ASM_OUTPUT_DEBUG_LABEL(FILE, PREFIX, NUM) \
  ASM_OUTPUT_INTERNAL_LABEL (FILE, PREFIX, NUM)
#endif

/* This is how we tell the assembler that a symbol is weak.  */
#ifndef ASM_OUTPUT_WEAK_ALIAS
#if defined (ASM_WEAKEN_LABEL) && defined (ASM_OUTPUT_DEF)
#define ASM_OUTPUT_WEAK_ALIAS(STREAM, NAME, VALUE)	\
  do							\
    {							\
      ASM_WEAKEN_LABEL (STREAM, NAME);			\
      if (VALUE)					\
        ASM_OUTPUT_DEF (STREAM, NAME, VALUE);		\
    }							\
  while (0)
#endif
#endif

/* This determines whether or not we support weak symbols.  */
#ifndef SUPPORTS_WEAK
#ifdef ASM_WEAKEN_LABEL
#define SUPPORTS_WEAK 1
#else
#define SUPPORTS_WEAK 0
#endif
#endif

/* This determines whether or not we support link-once semantics.  */
#ifndef SUPPORTS_ONE_ONLY
#ifdef MAKE_DECL_ONE_ONLY
#define SUPPORTS_ONE_ONLY 1
#else
#define SUPPORTS_ONE_ONLY 0
#endif
#endif

/* If the target supports weak symbols, define TARGET_ATTRIBUTE_WEAK to
   provide a weak attribute.  Else define it to nothing. 

   This would normally belong in gansidecl.h, but SUPPORTS_WEAK is
   not available at that time.

   Note, this is only for use by target files which we know are to be
   compiled by GCC.  */
#ifndef TARGET_ATTRIBUTE_WEAK
# if SUPPORTS_WEAK
#  define TARGET_ATTRIBUTE_WEAK __attribute__ ((weak))
# else
#  define TARGET_ATTRIBUTE_WEAK
# endif
#endif

/* If the target supports init_priority C++ attribute, give
   SUPPORTS_INIT_PRIORITY a nonzero value.  */
#ifndef SUPPORTS_INIT_PRIORITY
#define SUPPORTS_INIT_PRIORITY 1
#endif /* SUPPORTS_INIT_PRIORITY */

/* If duplicate library search directories can be removed from a
   linker command without changing the linker's semantics, give this
   symbol a nonzero.  */
#ifndef LINK_ELIMINATE_DUPLICATE_LDIRECTORIES
#define LINK_ELIMINATE_DUPLICATE_LDIRECTORIES 0
#endif /* LINK_ELIMINATE_DUPLICATE_LDIRECTORIES */

/* If we have a definition of INCOMING_RETURN_ADDR_RTX, assume that
   the rest of the DWARF 2 frame unwind support is also provided.  */
#if !defined (DWARF2_UNWIND_INFO) && defined (INCOMING_RETURN_ADDR_RTX)
#define DWARF2_UNWIND_INFO 1
#endif

#if defined (DWARF2_UNWIND_INFO) && !defined (EH_FRAME_SECTION)
# if defined (EH_FRAME_SECTION_ASM_OP)
#  define EH_FRAME_SECTION() eh_frame_section ()
# else
   /* If we aren't using crtstuff to run ctors, don't use it for EH.  */
#  if defined (ASM_OUTPUT_SECTION_NAME) && defined (ASM_OUTPUT_CONSTRUCTOR)
#   define EH_FRAME_SECTION_ASM_OP	"\t.section\t.eh_frame,\"aw\""
#   define EH_FRAME_SECTION() \
     do { named_section (NULL_TREE, ".eh_frame", 0); } while (0)
#  endif
# endif
#endif

/* If we have no definition for UNIQUE_SECTION, but do have the 
   ability to generate arbitrary sections, construct something
   reasonable.  */
#ifdef ASM_OUTPUT_SECTION_NAME
#ifndef UNIQUE_SECTION
#define UNIQUE_SECTION(DECL,RELOC)				\
do {								\
  int len;							\
  const char *name;						\
  char *string;							\
								\
  name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (DECL));	\
  /* Strip off any encoding in name.  */			\
  STRIP_NAME_ENCODING (name, name);				\
								\
  len = strlen (name) + 1;					\
  string = alloca (len + 1);					\
  sprintf (string, ".%s", name);				\
								\
  DECL_SECTION_NAME (DECL) = build_string (len, string);	\
} while (0)
#endif
#ifndef UNIQUE_SECTION_P
#define UNIQUE_SECTION_P(DECL) 0
#endif
#endif

/* By default, we generate a label at the beginning and end of the
   text section, and compute the size of the text section by
   subtracting the two.  However, on some platforms that doesn't 
   work, and we use the section itself, rather than a label at the
   beginning of it, to indicate the start of the section.  On such
   platforms, define this to zero.  */
#ifndef DWARF2_GENERATE_TEXT_SECTION_LABEL
#define DWARF2_GENERATE_TEXT_SECTION_LABEL 1
#endif

/* Supply a default definition for PROMOTE_PROTOTYPES.  */
#ifndef PROMOTE_PROTOTYPES
#define PROMOTE_PROTOTYPES	0
#endif

/* Number of hardware registers that go into the DWARF-2 unwind info.
   If not defined, equals FIRST_PSEUDO_REGISTER  */

#ifndef DWARF_FRAME_REGISTERS
#define DWARF_FRAME_REGISTERS FIRST_PSEUDO_REGISTER
#endif

/* Default sizes for base C types.  If the sizes are different for
   your target, you should override these values by defining the
   appropriate symbols in your tm.h file.  */

#ifndef CHAR_TYPE_SIZE
#define CHAR_TYPE_SIZE BITS_PER_UNIT
#endif

#ifndef SHORT_TYPE_SIZE
#define SHORT_TYPE_SIZE (BITS_PER_UNIT * MIN ((UNITS_PER_WORD + 1) / 2, 2))
#endif

#ifndef INT_TYPE_SIZE
#define INT_TYPE_SIZE BITS_PER_WORD
#endif

#ifndef LONG_TYPE_SIZE
#define LONG_TYPE_SIZE BITS_PER_WORD
#endif

#ifndef LONG_LONG_TYPE_SIZE
#define LONG_LONG_TYPE_SIZE (BITS_PER_WORD * 2)
#endif

#ifndef WCHAR_TYPE_SIZE
#define WCHAR_TYPE_SIZE INT_TYPE_SIZE
#endif

#ifndef WCHAR_UNSIGNED
#define WCHAR_UNSIGNED 0
#endif

#ifndef FLOAT_TYPE_SIZE
#define FLOAT_TYPE_SIZE BITS_PER_WORD
#endif

#ifndef DOUBLE_TYPE_SIZE
#define DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
#endif

#ifndef LONG_DOUBLE_TYPE_SIZE
#define LONG_DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
#endif

#ifndef BUILD_VA_LIST_TYPE
#define BUILD_VA_LIST_TYPE(X) ((X) = ptr_type_node)
#endif

/* By default, the preprocessor should be invoked the same way in C++
   as in C.  */
#ifndef CPLUSPLUS_CPP_SPEC
#ifdef CPP_SPEC
#define CPLUSPLUS_CPP_SPEC CPP_SPEC
#endif
#endif

/* By default, the C++ compiler will use the lowest bit of the pointer
   to function to indicate a pointer-to-member-function points to a
   virtual member function.  However, if FUNCTION_BOUNDARY indicates
   function addresses aren't always even, the lowest bit of the delta
   field will be used.  */
#ifndef TARGET_PTRMEMFUNC_VBIT_LOCATION
#define TARGET_PTRMEMFUNC_VBIT_LOCATION \
  (FUNCTION_BOUNDARY >= 2 * BITS_PER_UNIT \
   ? ptrmemfunc_vbit_in_pfn : ptrmemfunc_vbit_in_delta)
#endif

/* By default, the C++ compiler will use function addresses in the
   vtable entries.  Setting this non-zero tells the compiler to use
   function descriptors instead.  The value of this macro says how
   many words wide the descriptor is (normally 2).  It is assumed 
   that the address of a function descriptor may be treated as a
   pointer to a function.  */
#ifndef TARGET_VTABLE_USES_DESCRIPTORS
#define TARGET_VTABLE_USES_DESCRIPTORS 0
#endif

/* Select a format to encode pointers in exception handling data.  We
   prefer those that result in fewer dynamic relocations.  Assume no
   special support here and encode direct references.  */
#ifndef ASM_PREFERRED_EH_DATA_FORMAT
#define ASM_PREFERRED_EH_DATA_FORMAT(CODE,GLOBAL)  DW_EH_PE_absptr
#endif

/* True if it is possible to profile code that does not have a frame
   pointer.  */

#ifndef TARGET_ALLOWS_PROFILING_WITHOUT_FRAME_POINTER
#define TARGET_ALLOWS_PROFILING_WITHOUT_FRAME_POINTER true
#endif

#ifndef ACCUMULATE_OUTGOING_ARGS
#define ACCUMULATE_OUTGOING_ARGS 0
#endif

/* Supply a default definition for PUSH_ARGS.  */
#ifndef PUSH_ARGS
#ifdef PUSH_ROUNDING
#define PUSH_ARGS	!ACCUMULATE_OUTGOING_ARGS
#else
#define PUSH_ARGS	0
#endif
#endif

#endif  /* GCC_DEFAULTS_H */