* defs.h, top.c: Use `extern' in declarations of GUI hooks, and

[deliverable/binutils-gdb.git] / gdb / defs.h

/* Basic, host-specific, and target-specific definitions for GDB.
   Copyright (C) 1986, 1989, 1991, 1992, 1993, 1994
   Free Software Foundation, Inc.

This file is part of GDB.

This program 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 of the License, or
(at your option) any later version.

This program 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 this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */

#if !defined (DEFS_H)
#define DEFS_H 1

#include <stdio.h>

/* First include ansidecl.h so we can use the various macro definitions
   here and in all subsequent file inclusions.  */

#include "ansidecl.h"

/* For BFD64 and bfd_vma.  */
#include "bfd.h"

/* An address in the program being debugged.  Host byte order.  Rather
   than duplicate all the logic in BFD which figures out what type
   this is (long, long long, etc.) and whether it needs to be 64
   bits (the host/target interactions are subtle), we just use
   bfd_vma.  */

typedef bfd_vma CORE_ADDR;

#define min(a, b) ((a) < (b) ? (a) : (b))
#define max(a, b) ((a) > (b) ? (a) : (b))

/* Gdb does *lots* of string compares.  Use macros to speed them up by
   avoiding function calls if the first characters are not the same. */

#define STRCMP(a,b) (*(a) == *(b) ? strcmp ((a), (b)) : (int)*(a) - (int)*(b))
#define STREQ(a,b) (*(a) == *(b) ? !strcmp ((a), (b)) : 0)
#define STREQN(a,b,c) (*(a) == *(b) ? !strncmp ((a), (b), (c)) : 0)

/* The character GNU C++ uses to build identifiers that must be unique from
   the program's identifiers (such as $this and $$vptr).  */
#define CPLUS_MARKER '$'	/* May be overridden to '.' for SysV */

#include <errno.h>		/* System call error return status */

extern int quit_flag;
extern int immediate_quit;
extern int sevenbit_strings;

extern void quit PARAMS ((void));

#define QUIT { if (quit_flag) quit (); }

/* Command classes are top-level categories into which commands are broken
   down for "help" purposes.  
   Notes on classes: class_alias is for alias commands which are not
   abbreviations of the original command.  class-pseudo is for commands
   which are not really commands nor help topics ("stop").  */

enum command_class
{
  /* Special args to help_list */
  all_classes = -2, all_commands = -1,
  /* Classes of commands */
  no_class = -1, class_run = 0, class_vars, class_stack,
  class_files, class_support, class_info, class_breakpoint,
  class_alias, class_obscure, class_user, class_maintenance,
  class_pseudo
};

/* Languages represented in the symbol table and elsewhere.
   This should probably be in language.h, but since enum's can't
   be forward declared to satisfy opaque references before their
   actual definition, needs to be here. */

enum language 
{
   language_unknown, 		/* Language not known */
   language_auto,		/* Placeholder for automatic setting */
   language_c, 			/* C */
   language_cplus, 		/* C++ */
   language_chill,		/* Chill */
   language_m2,			/* Modula-2 */
   language_asm			/* Assembly language */
};

/* the cleanup list records things that have to be undone
   if an error happens (descriptors to be closed, memory to be freed, etc.)
   Each link in the chain records a function to call and an
   argument to give it.

   Use make_cleanup to add an element to the cleanup chain.
   Use do_cleanups to do all cleanup actions back to a given
   point in the chain.  Use discard_cleanups to remove cleanups
   from the chain back to a given point, not doing them.  */

struct cleanup
{
  struct cleanup *next;
  void (*function) PARAMS ((PTR));
  PTR arg;
};

/* From blockframe.c */

extern int inside_entry_func PARAMS ((CORE_ADDR));

extern int inside_entry_file PARAMS ((CORE_ADDR addr));

extern int inside_main_func PARAMS ((CORE_ADDR pc));

/* From ch-lang.c, for the moment. (FIXME) */

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

/* From libiberty.a */

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

extern char *cplus_mangle_opname PARAMS ((char *, int));

/* From libmmalloc.a (memory mapped malloc library) */

extern PTR mmalloc_attach PARAMS ((int, PTR));

extern PTR mmalloc_detach PARAMS ((PTR));

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

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

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

extern int mmalloc_setkey PARAMS ((PTR, int, PTR));

extern PTR mmalloc_getkey PARAMS ((PTR, int));

/* From utils.c */

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

extern char *safe_strerror PARAMS ((int));

extern char *safe_strsignal PARAMS ((int));

extern void init_malloc PARAMS ((void *));

extern void request_quit PARAMS ((int));

extern void do_cleanups PARAMS ((struct cleanup *));

extern void discard_cleanups PARAMS ((struct cleanup *));

/* The bare make_cleanup function is one of those rare beasts that
   takes almost any type of function as the first arg and anything that
   will fit in a "void *" as the second arg.

   Should be, once all calls and called-functions are cleaned up:
extern struct cleanup *
make_cleanup PARAMS ((void (*function) (void *), void *));

   Until then, lint and/or various type-checking compiler options will
   complain about make_cleanup calls.  It'd be wrong to just cast things,
   since the type actually passed when the function is called would be
   wrong.  */

extern struct cleanup *make_cleanup ();

extern struct cleanup *save_cleanups PARAMS ((void));

extern void restore_cleanups PARAMS ((struct cleanup *));

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

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

extern int myread PARAMS ((int, char *, int));

extern int query ();
\f
/* Annotation stuff.  */

extern int annotation_level; /* in stack.c */
\f
extern void begin_line PARAMS ((void));

extern void wrap_here PARAMS ((char *));

extern void reinitialize_more_filter PARAMS ((void));

typedef FILE GDB_FILE;
#define gdb_stdout stdout
#define gdb_stderr stderr

extern int print_insn PARAMS ((CORE_ADDR, GDB_FILE *));

extern void gdb_flush PARAMS ((GDB_FILE *));

extern GDB_FILE *gdb_fopen PARAMS ((char * name, char * mode));

extern void fputs_filtered PARAMS ((const char *, GDB_FILE *));

extern void fputs_unfiltered PARAMS ((const char *, GDB_FILE *));

extern void fputc_unfiltered PARAMS ((int, GDB_FILE *));

extern void putc_unfiltered PARAMS ((int));

#define putchar_unfiltered(C)  putc_unfiltered(C)

extern void puts_filtered PARAMS ((char *));

extern void puts_unfiltered PARAMS ((char *));

extern void vprintf_filtered ();

extern void vfprintf_filtered ();

extern void fprintf_filtered ();

extern void fprintfi_filtered ();

extern void printf_filtered ();

extern void printfi_filtered ();

extern void vprintf_unfiltered ();

extern void vfprintf_unfiltered ();

extern void fprintf_unfiltered ();

extern void printf_unfiltered ();

extern void print_spaces PARAMS ((int, GDB_FILE *));

extern void print_spaces_filtered PARAMS ((int, GDB_FILE *));

extern char *n_spaces PARAMS ((int));

extern void gdb_printchar PARAMS ((int, GDB_FILE *, int));

extern void gdb_print_address PARAMS ((void *, GDB_FILE *));

extern void fprintf_symbol_filtered PARAMS ((GDB_FILE *, char *,
					     enum language, int));

extern void perror_with_name PARAMS ((char *));

extern void print_sys_errmsg PARAMS ((char *, int));

/* From regex.c or libc.  BSD 4.4 declares this with the argument type as
   "const char *" in unistd.h, so we can't declare the argument
   as "char *".  */

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

/* From symfile.c */

extern void symbol_file_command PARAMS ((char *, int));

/* From main.c */

extern char *skip_quoted PARAMS ((char *));

extern char *gdb_readline PARAMS ((char *));

extern char *command_line_input PARAMS ((char *, int, char *));

extern void print_prompt PARAMS ((void));

extern int input_from_terminal_p PARAMS ((void));

/* From printcmd.c */

extern void set_next_address PARAMS ((CORE_ADDR));

extern void print_address_symbolic PARAMS ((CORE_ADDR, GDB_FILE *, int,
					    char *));

extern void print_address_numeric PARAMS ((CORE_ADDR, int, GDB_FILE *));

extern void print_address PARAMS ((CORE_ADDR, GDB_FILE *));

/* From source.c */

extern int openp PARAMS ((char *, int, char *, int, int, char **));

extern void mod_path PARAMS ((char *, char **));

extern void directory_command PARAMS ((char *, int));

extern void init_source_path PARAMS ((void));

/* From findvar.c */

extern int read_relative_register_raw_bytes PARAMS ((int, char *));

/* From readline (but not in any readline .h files).  */

extern char *tilde_expand PARAMS ((char *));

/* Structure for saved commands lines
   (for breakpoints, defined commands, etc).  */

struct command_line
{
  struct command_line *next;
  char *line;
};

extern struct command_line *read_command_lines PARAMS ((void));

extern void free_command_lines PARAMS ((struct command_line **));

/* String containing the current directory (what getwd would return).  */

extern char *current_directory;

/* Default radixes for input and output.  Only some values supported.  */
extern unsigned input_radix;
extern unsigned output_radix;

/* Possibilities for prettyprint parameters to routines which print
   things.  Like enum language, this should be in value.h, but needs
   to be here for the same reason.  FIXME:  If we can eliminate this
   as an arg to LA_VAL_PRINT, then we can probably move it back to
   value.h. */

enum val_prettyprint
{
  Val_no_prettyprint = 0,
  Val_prettyprint,
  /* Use the default setting which the user has specified.  */
  Val_pretty_default
};

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

#include "xm.h"

/* Native machine support.  This will be a symlink to one of the
   nm-*.h files, built by the `configure' script.  */

#include "nm.h"

/* If the xm.h file did not define the mode string used to open the
   files, assume that binary files are opened the same way as text
   files */
#ifndef FOPEN_RB
#include "fopen-same.h"
#endif

/*
 * Allow things in gdb to be declared "const".  If compiling ANSI, it
 * just works.  If compiling with gcc but non-ansi, redefine to __const__.
 * If non-ansi, non-gcc, then eliminate "const" entirely, making those
 * objects be read-write rather than read-only.
 */

#ifndef const
#ifndef __STDC__
# ifdef __GNUC__
#  define const __const__
# else
#  define const /*nothing*/
# endif /* GNUC */
#endif /* STDC */
#endif /* const */

#ifndef volatile
#ifndef __STDC__
# ifdef __GNUC__
#  define volatile __volatile__
# else
#  define volatile /*nothing*/
# endif /* GNUC */
#endif /* STDC */
#endif /* volatile */

/* The ability to declare that a function never returns is useful, but
   not really required to compile GDB successfully, so the NORETURN and
   ATTR_NORETURN macros normally expand into nothing.  */

/* If compiling with older versions of GCC, a function may be declared
   "volatile" to indicate that it does not return.  */

#ifndef NORETURN
# if defined(__GNUC__) \
     && (__GNUC__ == 1 || (__GNUC__ == 2 && __GNUC_MINOR__ < 5))
#  define NORETURN volatile
# else
#  define NORETURN /* nothing */
# endif
#endif

/* GCC 2.5 and later versions define a function attribute "noreturn",
   which is the preferred way to declare that a function never returns.  */

#ifndef ATTR_NORETURN
# if defined(__GNUC__) && __GNUC__ >= 2 && __GNUC_MINOR__ >= 5
#  define ATTR_NORETURN __attribute__ ((noreturn))
# else
#  define ATTR_NORETURN /* nothing */
# endif
#endif

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

#if !defined (UINT_MAX)
#define	UINT_MAX ((unsigned int)(~0))		/* 0xFFFFFFFF for 32-bits */
#endif

#if !defined (INT_MAX)
#define	INT_MAX ((int)(UINT_MAX >> 1))		/* 0x7FFFFFFF for 32-bits */
#endif

#if !defined (INT_MIN)
#define INT_MIN (-INT_MAX - 1)			/* 0x80000000 for 32-bits */
#endif

#if !defined (ULONG_MAX)
#define	ULONG_MAX ((unsigned long)(~0L))	/* 0xFFFFFFFF for 32-bits */
#endif

#if !defined (LONG_MAX)
#define	LONG_MAX ((long)(ULONG_MAX >> 1))	/* 0x7FFFFFFF for 32-bits */
#endif

#ifdef BFD64

/* This is to make sure that LONGEST is at least as big as CORE_ADDR.  */

#define LONGEST BFD_HOST_64_BIT

#else /* No BFD64 */

/* If all compilers for this host support "long long" and we want to
   use it for LONGEST (the performance hit is about 10% on a testsuite
   run based on one DECstation test), then the xm.h file can define
   CC_HAS_LONG_LONG.

   Using GCC 1.39 on BSDI with long long causes about 700 new
   testsuite failures.  Using long long for LONGEST on the DECstation
   causes 3 new FAILs in the testsuite and many heuristic fencepost
   warnings.  These are not investigated, but a first guess would be
   that the BSDI problems are GCC bugs in long long support and the
   latter are GDB bugs.  */

#ifndef CC_HAS_LONG_LONG
#  if defined (__GNUC__) && defined (FORCE_LONG_LONG)
#    define CC_HAS_LONG_LONG 1
#  endif
#endif

/* LONGEST should not be a typedef, because "unsigned LONGEST" needs to work.
   CC_HAS_LONG_LONG is defined if the host compiler supports "long long"
   variables and we wish to make use of that support.  */

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

#endif /* No BFD64 */

/* 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.  */

extern int longest_to_int PARAMS ((LONGEST));

/* 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[];

/* Message to be printed before the error message, when an error occurs.  */

extern char *error_pre_print;

/* Message to be printed before the warning message, when a warning occurs.  */

extern char *warning_pre_print;

extern NORETURN void error () ATTR_NORETURN;

extern void error_begin PARAMS ((void));

extern NORETURN void fatal () ATTR_NORETURN;

extern NORETURN void exit PARAMS ((int)) ATTR_NORETURN;	/* 4.10.4.3 */

extern NORETURN void nomem PARAMS ((long)) ATTR_NORETURN;

/* Reasons for calling return_to_top_level.  */
enum return_reason {
  /* User interrupt.  */
  RETURN_QUIT,

  /* Any other error.  */
  RETURN_ERROR
};

#define RETURN_MASK_QUIT (1 << (int)RETURN_QUIT)
#define RETURN_MASK_ERROR (1 << (int)RETURN_ERROR)
#define RETURN_MASK_ALL (RETURN_MASK_QUIT | RETURN_MASK_ERROR)
typedef int return_mask;

extern NORETURN void
return_to_top_level PARAMS ((enum return_reason)) ATTR_NORETURN;

extern int
catch_errors PARAMS ((int (*) (char *), void *, char *, return_mask));

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 ((GDB_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 (*compar)(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 */

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

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 __GNUC__
#  define alloca __builtin_alloca
# else /* Not GNU C */
#  ifdef sparc
#   include <alloca.h>		/* NOTE:  Doesn't declare alloca() */
#  endif

/* We need to be careful not to declare this in a way which conflicts with
   bison.  Bison never declares it as char *, but under various circumstances
   (like __hpux) we need to use void *.  */
#  if defined (__STDC__) || defined (__hpux)
   extern void *alloca ();
#  else /* Don't use void *.  */
   extern char *alloca ();
#  endif /* Don't use void *.  */
# endif /* Not GNU C */
#endif /* alloca not defined */

/* 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. */

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

#include "tm.h"

/* 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 (2 * 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 (4 * 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 (4 * 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 (4 * TARGET_CHAR_BIT)
#endif

/* Number of bits in a double for the target machine. */
#if !defined (TARGET_DOUBLE_BIT)
#define TARGET_DOUBLE_BIT (8 * 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

/* If we picked up a copy of CHAR_BIT from a configuration file
   (which may get it by including <limits.h>) then use it to set
   the number of bits in a host char.  If not, use the same size
   as the target. */

#if defined (CHAR_BIT)
#define HOST_CHAR_BIT CHAR_BIT
#else
#define HOST_CHAR_BIT TARGET_CHAR_BIT
#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.  */

/* In findvar.c.  */

extern LONGEST extract_signed_integer PARAMS ((void *, int));

extern unsigned LONGEST extract_unsigned_integer PARAMS ((void *, int));

extern CORE_ADDR extract_address PARAMS ((void *, int));

extern void store_signed_integer PARAMS ((void *, int, LONGEST));

extern void store_unsigned_integer PARAMS ((void *, int, unsigned LONGEST));

extern void store_address PARAMS ((void *, int, CORE_ADDR));

extern double extract_floating PARAMS ((void *, int));

extern void store_floating PARAMS ((void *, int, double));
\f
/* 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.  This is used only for addresses of instructions, and even then
   I'm not sure it's used in all contexts.  It exists to deal with there
   being a few stray bits in the PC which would mislead us, not as some sort
   of generic thing to handle alignment or segmentation (it's possible it
   should be in TARGET_READ_PC instead).  */
#if !defined (ADDR_BITS_REMOVE)
#define ADDR_BITS_REMOVE(addr) (addr)
#endif /* No ADDR_BITS_REMOVE.  */

/* From valops.c */

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

extern CORE_ADDR push_word PARAMS ((CORE_ADDR, unsigned LONGEST));

/* 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

/* Hooks for alternate command interfaces.  */

#ifdef __STDC__
struct symtab;
struct breakpoint;
#endif

extern void (*init_ui_hook) PARAMS ((void));
extern void (*command_loop_hook) PARAMS ((void));
extern void (*fputs_unfiltered_hook) PARAMS ((const char *linebuffer));
extern void (*print_frame_info_listing_hook) PARAMS ((struct symtab *s, int line,
					       int stopline, int noerror));
extern int (*query_hook) PARAMS (());
extern void (*flush_hook) PARAMS ((FILE *stream));
extern void (*create_breakpoint_hook) PARAMS ((struct breakpoint *b));
extern void (*delete_breakpoint_hook) PARAMS ((struct breakpoint *bpt));
extern void (*enable_breakpoint_hook) PARAMS ((struct breakpoint *bpt));
extern void (*disable_breakpoint_hook) PARAMS ((struct breakpoint *bpt));

/* Inhibit window interface if non-zero. */

extern int no_windows;

#endif /* !defined (DEFS_H) */