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[bpt/guile.git] / libguile / gdb_interface.h

/* Simple interpreter interface for GDB, the GNU debugger.
   Copyright (C) 1996, 2000 Free Software Foundation

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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.

As a special exception, the Free Software Foundation gives permission
for additional uses of the text contained in its release of GUILE.

The exception is that, if you link the GUILE library with other files
to produce an executable, this does not by itself cause the
resulting executable to be covered by the GNU General Public License.
Your use of that executable is in no way restricted on account of
linking the GUILE library code into it.

This exception does not however invalidate any other reasons why
the executable file might be covered by the GNU General Public License.

This exception applies only to the code released by the
Free Software Foundation under the name GUILE.  If you copy
code from other Free Software Foundation releases into a copy of
GUILE, as the General Public License permits, the exception does
not apply to the code that you add in this way.  To avoid misleading
anyone as to the status of such modified files, you must delete
this exception notice from them.

If you write modifications of your own for GUILE, it is your choice
whether to permit this exception to apply to your modifications.
If you do not wish that, delete this exception notice.

The author can be reached at djurfeldt@nada.kth.se
Mikael Djurfeldt, SANS/NADA KTH, 10044 STOCKHOLM, SWEDEN  */

#ifndef GDB_INTERFACE_H
#define GDB_INTERFACE_H

/* This is the header file for GDB's interpreter interface.  The
   interpreter must supply definitions of all symbols declared in this
   file.

   Before including this file, you must #define GDB_TYPE to be the
   data type used for communication with the interpreter. */

/* The following macro can be used to anchor the symbols of the
   interface in your main program.  This is necessary if the interface
   is defined in a library, such as Guile. */

#ifndef __MINGW32__
#define GDB_INTERFACE \
void *gdb_interface[] = { \
  &gdb_options, \
  &gdb_language, \
  &gdb_result, \
  &gdb_output, \
  &gdb_output_length, \
  (void *) gdb_maybe_valid_type_p, \
  (void *) gdb_read, \
  (void *) gdb_eval, \
  (void *) gdb_print, \
  (void *) gdb_binding \
}
#else /* __MINGW32__ */
/* Because the following functions are imported from a DLL (some kind of
   shared library) these are NO static initializers. That is why you need to
   define them and assign the functions and data items at run time. */
#define GDB_INTERFACE \
void *gdb_interface[] = \
  { NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL };
#define GDB_INTERFACE_INIT \
  do { \
    gdb_interface[0] = &gdb_options; \
    gdb_interface[1] = &gdb_language; \
    gdb_interface[2] = &gdb_result; \
    gdb_interface[3] = &gdb_output; \
    gdb_interface[4] = &gdb_output_length; \
    gdb_interface[5] = (void *) gdb_maybe_valid_type_p; \
    gdb_interface[6] = (void *) gdb_read; \
    gdb_interface[7] = (void *) gdb_eval; \
    gdb_interface[8] = (void *) gdb_print; \
    gdb_interface[9] = (void *) gdb_binding; \
  } while (0);
#endif /* __MINGW32__ */

/* GDB_OPTIONS is a set of flags informing gdb what features are present
   in the interface.  Currently only one option is supported: */

/* GDB_HAVE_BINDINGS: Set this bit if your interpreter can create new
   top level bindings on demand (through gdb_top_level_binding) */

#define GDB_HAVE_BINDINGS 1

extern unsigned short gdb_options;

/* GDB_LANGUAGE holds the name of the preferred language mode for this
   interpreter.  For lisp interpreters, the suggested mode is "lisp/c". */

extern char *gdb_language;
   
/* GDB_RESULT is used for passing results from the interpreter to GDB */

extern GDB_TYPE gdb_result;

/* The interpreter passes strings to GDB in GDB_OUTPUT and
   GDB_OUTPUT_LENGTH.  GDB_OUTPUT should hold the pointer to the
   string.  GDB_OUTPUT_LENGTH should hold its length.  The string
   doesn't need to be terminated by '\0'. */

extern char *gdb_output;

extern int gdb_output_length;

/* Return TRUE if the interpreter regards VALUE's type as valid.  A
   lazy implementation is allowed to pass TRUE always.  FALSE should
   only be returned when it is certain that VALUE is not valid.

   In the "lisp/c" language mode, this is used to heuristically
   discriminate lisp values from C values during printing. */

extern int gdb_maybe_valid_type_p (GDB_TYPE value);

/* Parse expression in string STR.  Store result in GDB_RESULT, then
   return 0 to indicate success.  On error, return -1 to indicate
   failure.  An error string can be passed in GDB_OUTPUT and
   GDB_OUTPUT_LENGTH.  Be careful to set GDB_OUTPUT_LENGTH to zero if
   no message is passed.  Please note that the resulting value should
   be protected against garbage collection. */

extern int gdb_read (char *str);

/* Evaluate expression EXP.  Store result in GDB_RESULT, then return 0
   to indicate success.  On error, return -1 to indicate failure.  Any
   output (both on success and failure) can be passed in GDB_OUTPUT
   and GDB_OUTPUT_LENGTH.  Be careful to set GDB_OUTPUT_LENGTH to zero
   if no output is passed.  Please note that the resulting lisp object
   should be protected against garbage collection. */

extern int gdb_eval (GDB_TYPE exp);

/* Print VALUE.  Store output in GDB_OUTPUT and GDB_OUTPUT_LENGTH.
   Return 0 to indicate success.  On error, return -1 to indicate
   failure.  GDB will not look at GDB_OUTPUT or GDB_OUTPUT_LENGTH on
   failure.  Note that this function should be robust against strange
   values.  It could in fact be passed any kind of value. */

extern int gdb_print (GDB_TYPE value);

/* Bind NAME to VALUE in interpreter.  (GDB has previously obtained
   NAME by passing a string to gdb_read.)  Return 0 to indicate
   success or -1 to indicate failure.  This feature is optional.  GDB
   will only call this function if the GDB_HAVE_BINDINGS flag is set
   in gdb_options.  Note that GDB may call this function many times
   for the same name.

   For scheme interpreters, this function should introduce top-level
   bindings. */

extern int gdb_binding (GDB_TYPE name, GDB_TYPE value);

#endif /* GDB_INTERFACE_H */

/*
  Local Variables:
  c-file-style: "gnu"
  End:
*/