defs.h

早期freebsd实现

/* Some compilers (many AT&T SVR4 compilers for instance), do not accept
   declarations of functions that never return (exit for instance) as
   "volatile void".  For such compilers "NORETURN" can be defined away
   to keep them happy */

#ifndef NORETURN
# ifdef __lucid
#   define NORETURN /*nothing*/
# else
#   define NORETURN volatile
# endif
#endif

/* Defaults for system-wide constants (if not defined by xm.h, we fake it).  */

#if !defined (UINT_MAX)
#define UINT_MAX 0xffffffff
#endif

#if !defined (LONG_MAX)
#define LONG_MAX 0x7fffffff
#endif

#if !defined (INT_MAX)
#define INT_MAX 0x7fffffff
#endif

#if !defined (INT_MIN)
/* Two's complement, 32 bit.  */
#define INT_MIN -0x80000000
#endif

/* Number of bits in a char or unsigned char for the target machine.
   Just like CHAR_BIT in <limits.h> but describes the target machine.  */
#if !defined (TARGET_CHAR_BIT)
#define TARGET_CHAR_BIT 8
#endif

/* Number of bits in a short or unsigned short for the target machine. */
#if !defined (TARGET_SHORT_BIT)
#define TARGET_SHORT_BIT (sizeof (short) * TARGET_CHAR_BIT)
#endif

/* Number of bits in an int or unsigned int for the target machine. */
#if !defined (TARGET_INT_BIT)
#define TARGET_INT_BIT (sizeof (int) * TARGET_CHAR_BIT)
#endif

/* Number of bits in a long or unsigned long for the target machine. */
#if !defined (TARGET_LONG_BIT)
#define TARGET_LONG_BIT (sizeof (long) * TARGET_CHAR_BIT)
#endif

/* Number of bits in a long long or unsigned long long for the target machine. */
#if !defined (TARGET_LONG_LONG_BIT)
#define TARGET_LONG_LONG_BIT (2 * TARGET_LONG_BIT)
#endif

/* Number of bits in a float for the target machine. */
#if !defined (TARGET_FLOAT_BIT)
#define TARGET_FLOAT_BIT (sizeof (float) * TARGET_CHAR_BIT)
#endif

/* Number of bits in a double for the target machine. */
#if !defined (TARGET_DOUBLE_BIT)
#define TARGET_DOUBLE_BIT (sizeof (double) * TARGET_CHAR_BIT)
#endif

/* Number of bits in a long double for the target machine. */
#if !defined (TARGET_LONG_DOUBLE_BIT)
#define TARGET_LONG_DOUBLE_BIT (2 * TARGET_DOUBLE_BIT)
#endif

/* Number of bits in a "complex" for the target machine. */
#if !defined (TARGET_COMPLEX_BIT)
#define TARGET_COMPLEX_BIT (2 * TARGET_FLOAT_BIT)
#endif

/* Number of bits in a "double complex" for the target machine. */
#if !defined (TARGET_DOUBLE_COMPLEX_BIT)
#define TARGET_DOUBLE_COMPLEX_BIT (2 * TARGET_DOUBLE_BIT)
#endif

/* Number of bits in a pointer for the target machine */
#if !defined (TARGET_PTR_BIT)
#define TARGET_PTR_BIT TARGET_INT_BIT
#endif

/* Convert a LONGEST to an int.  This is used in contexts (e.g. number
   of arguments to a function, number in a value history, register
   number, etc.) where the value must not be larger than can fit
   in an int.  */
#if !defined (longest_to_int)
#if defined (LONG_LONG)
#define longest_to_int(x) (((x) > INT_MAX || (x) < INT_MIN) \
			   ? (error ("Value out of range."),0) : (int) (x))
#else /* No LONG_LONG.  */
/* Assume sizeof (int) == sizeof (long).  */
#define longest_to_int(x) ((int) (x))
#endif /* No LONG_LONG.  */
#endif /* No longest_to_int.  */

/* This should not be a typedef, because "unsigned LONGEST" needs
   to work. LONG_LONG is defined if the host has "long long".  */

#ifndef LONGEST
# ifdef LONG_LONG
#  define LONGEST long long
# else
#  define LONGEST long
# endif
#endif

/* Assorted functions we can declare, now that const and volatile are 
   defined.  */

extern char *
savestring PARAMS ((const char *, int));

extern char *
msavestring PARAMS ((void *, const char *, int));

extern char *
strsave PARAMS ((const char *));

extern char *
mstrsave PARAMS ((void *, const char *));

extern char *
concat PARAMS ((char *, ...));

extern PTR
xmalloc PARAMS ((long));

extern PTR
xrealloc PARAMS ((PTR, long));

extern PTR
xmmalloc PARAMS ((PTR, long));

extern PTR
xmrealloc PARAMS ((PTR, PTR, long));

extern PTR
mmalloc PARAMS ((PTR, long));

extern PTR
mrealloc PARAMS ((PTR, PTR, long));

extern void
mfree PARAMS ((PTR, PTR));

extern int
mmcheck PARAMS ((PTR, void (*) (void)));

extern int
mmtrace PARAMS ((void));

extern int
parse_escape PARAMS ((char **));

extern const char * const reg_names[];

extern NORETURN void			/* Does not return to the caller.  */
error ();

extern NORETURN void			/* Does not return to the caller.  */
fatal ();

extern NORETURN void			/* Not specified as volatile in ... */
exit PARAMS ((int));			/* 4.10.4.3 */

extern NORETURN void			/* Does not return to the caller.  */
nomem PARAMS ((long));

extern NORETURN void			/* Does not return to the caller.  */
return_to_top_level PARAMS ((void));

extern void
warning_setup PARAMS ((void));

extern void
warning ();

/* Global functions from other, non-gdb GNU thingies (libiberty for
   instance) */

extern char *
basename PARAMS ((char *));

extern char *
getenv PARAMS ((const char *));

extern char **
buildargv PARAMS ((char *));

extern void
freeargv PARAMS ((char **));

extern char *
strerrno PARAMS ((int));

extern char *
strsigno PARAMS ((int));

extern int
errno_max PARAMS ((void));

extern int
signo_max PARAMS ((void));

extern int
strtoerrno PARAMS ((char *));

extern int
strtosigno PARAMS ((char *));

extern char *
strsignal PARAMS ((int));

/* From other system libraries */

#ifndef PSIGNAL_IN_SIGNAL_H
extern void
psignal PARAMS ((unsigned, const char *));
#endif

/* For now, we can't include <stdlib.h> because it conflicts with
   "../include/getopt.h".  (FIXME)

   However, if a function is defined in the ANSI C standard and a prototype
   for that function is defined and visible in any header file in an ANSI
   conforming environment, then that prototype must match the definition in
   the ANSI standard.  So we can just duplicate them here without conflict,
   since they must be the same in all conforming ANSI environments.  If
   these cause problems, then the environment is not ANSI conformant. */
   
#ifdef __STDC__
#include <stddef.h>
#endif

extern int
fclose PARAMS ((FILE *stream));				/* 4.9.5.1 */

extern void
perror PARAMS ((const char *));				/* 4.9.10.4 */

extern double
atof PARAMS ((const char *nptr));			/* 4.10.1.1 */

extern int
atoi PARAMS ((const char *));				/* 4.10.1.2 */

#ifndef MALLOC_INCOMPATIBLE

extern PTR
malloc PARAMS ((size_t size));                          /* 4.10.3.3 */

extern PTR
realloc PARAMS ((void *ptr, size_t size));              /* 4.10.3.4 */

extern void
free PARAMS ((void *));					/* 4.10.3.2 */

#endif	/* MALLOC_INCOMPATIBLE */

extern void
qsort PARAMS ((void *base, size_t nmemb,		/* 4.10.5.2 */
	       size_t size,
	       int (*comp)(const void *, const void *)));

#ifndef	MEM_FNS_DECLARED	/* Some non-ANSI use void *, not char *.  */
extern PTR
memcpy PARAMS ((void *, const void *, size_t));		/* 4.11.2.1 */
#endif

extern int
memcmp PARAMS ((const void *, const void *, size_t));	/* 4.11.4.1 */

extern char *
strchr PARAMS ((const char *, int));			/* 4.11.5.2 */

extern char *
strrchr PARAMS ((const char *, int));			/* 4.11.5.5 */

extern char *
strstr PARAMS ((const char *, const char *));		/* 4.11.5.7 */

extern char *
strtok PARAMS ((char *, const char *));			/* 4.11.5.8 */

#ifndef	MEM_FNS_DECLARED	/* Some non-ANSI use void *, not char *.  */
extern PTR
memset PARAMS ((void *, int, size_t));			/* 4.11.6.1 */
#endif

extern char *
strerror PARAMS ((int));				/* 4.11.6.2 */

/* Various possibilities for alloca.  */
#ifndef alloca
# ifdef notdef /*XXX*/
#  define alloca __builtin_alloca
# else
#  if defined(sparc) && !defined(__GNUC__)
#   include <alloca.h>		/* NOTE:  Doesn't declare alloca() */
#  endif
#  ifdef __STDC__
   extern void *alloca (size_t);
#  else /* __STDC__ */
   extern char *alloca ();
#  endif
# endif
#endif

/* TARGET_BYTE_ORDER and HOST_BYTE_ORDER must be defined to one of these.  */

#if !defined (BIG_ENDIAN)
#define BIG_ENDIAN 4321
#endif

#if !defined (LITTLE_ENDIAN)
#define LITTLE_ENDIAN 1234
#endif

/* Target-system-dependent parameters for GDB.

   The standard thing is to include defs.h.  However, files that are
   specific to a particular target can define TM_FILE_OVERRIDE before
   including defs.h, then can include any particular tm-file they desire.  */

/* Target machine definition.  This will be a symlink to one of the
   tm-*.h files, built by the `configure' script.  */

#ifndef TM_FILE_OVERRIDE
#include "tm.h"
#endif

/* The bit byte-order has to do just with numbering of bits in
   debugging symbols and such.  Conceptually, it's quite separate
   from byte/word byte order.  */

#if !defined (BITS_BIG_ENDIAN)
#if TARGET_BYTE_ORDER == BIG_ENDIAN
#define BITS_BIG_ENDIAN 1
#endif /* Big endian.  */

#if TARGET_BYTE_ORDER == LITTLE_ENDIAN
#define BITS_BIG_ENDIAN 0
#endif /* Little endian.  */
#endif /* BITS_BIG_ENDIAN not defined.  */

/* Swap LEN bytes at BUFFER between target and host byte-order.  */
#if TARGET_BYTE_ORDER == HOST_BYTE_ORDER
#define SWAP_TARGET_AND_HOST(buffer,len)
#else /* Target and host byte order differ.  */
#define SWAP_TARGET_AND_HOST(buffer,len) \
  {	       	       	       	       	       	       	       	       	 \
    char tmp;								 \
    char *p = (char *)(buffer);						 \
    char *q = ((char *)(buffer)) + len - 1;		   		 \
    for (; p < q; p++, q--)				 		 \
      {									 \
        tmp = *q;							 \
        *q = *p;							 \
        *p = tmp;							 \
      }									 \
  }
#endif /* Target and host byte order differ.  */

/* On some machines there are bits in addresses which are not really
   part of the address, but are used by the kernel, the hardware, etc.
   for special purposes.  ADDR_BITS_REMOVE takes out any such bits
   so we get a "real" address such as one would find in a symbol
   table.  ADDR_BITS_SET sets those bits the way the system wants
   them.  */
#if !defined (ADDR_BITS_REMOVE)
#define ADDR_BITS_REMOVE(addr) (addr)
#define ADDR_BITS_SET(addr) (addr)
#endif /* No ADDR_BITS_REMOVE.  */

/* If this definition isn't overridden by the header files, assume
   that isatty and fileno exist on this system.  */
#ifndef ISATTY
#define ISATTY(FP)    (isatty(fileno(FP)))
#endif

/* From valops.c */

extern CORE_ADDR
push_bytes PARAMS ((CORE_ADDR, char *, int));

/* In some modules, we don't have a definition of REGISTER_TYPE yet, so we
   must avoid prototyping this function for now.  FIXME.  Should be:
extern CORE_ADDR
push_word PARAMS ((CORE_ADDR, REGISTER_TYPE));
 */
extern CORE_ADDR
push_word ();

/* Some parts of gdb might be considered optional, in the sense that they
   are not essential for being able to build a working, usable debugger
   for a specific environment.  For example, the maintenance commands
   are there for the benefit of gdb maintainers.  As another example,
   some environments really don't need gdb's that are able to read N
   different object file formats.  In order to make it possible (but
   not necessarily recommended) to build "stripped down" versions of
   gdb, the following defines control selective compilation of those
   parts of gdb which can be safely left out when necessary.  Note that
   the default is to include everything. */

#ifndef MAINTENANCE_CMDS
#define MAINTENANCE_CMDS 1
#endif

#endif /* !defined (DEFS_H) */