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/* Copyright (C) 2001 Free Software Foundation, Inc.
*
* 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, 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 software; see the file COPYING. 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. */
#ifndef _SCM_FRAMES_H_
#define _SCM_FRAMES_H_
#include <libguile.h>
#include "programs.h"
/*
* VM frames
*/
/* VM Frame Layout
---------------
| | <- fp + bp->nargs + bp->nlocs + 4
+------------------+ = SCM_FRAME_UPPER_ADDRESS (fp)
| Return address |
| Dynamic link |
| Heap link |
| External link | <- fp + bp->nargs + bp->nlocs
| Local variable 1 | = SCM_FRAME_DATA_ADDRESS (fp)
| Local variable 0 | <- fp + bp->nargs
| Argument 1 |
| Argument 0 | <- fp
| Program | <- fp - 1
+------------------+ = SCM_FRAME_LOWER_ADDRESS (fp)
| |
As can be inferred from this drawing, it is assumed that
`sizeof (SCM *) == sizeof (SCM)', since pointers (the `link' parts) are
assumed to be as long as SCM objects. */
#define SCM_FRAME_DATA_ADDRESS(fp) \
(fp + SCM_PROGRAM_DATA (SCM_FRAME_PROGRAM (fp))->nargs \
+ SCM_PROGRAM_DATA (SCM_FRAME_PROGRAM (fp))->nlocs)
#define SCM_FRAME_UPPER_ADDRESS(fp) (SCM_FRAME_DATA_ADDRESS (fp) + 4)
#define SCM_FRAME_LOWER_ADDRESS(fp) (fp - 1)
#define SCM_FRAME_BYTE_CAST(x) ((scm_byte_t *) SCM_UNPACK (x))
#define SCM_FRAME_STACK_CAST(x) ((SCM *) SCM_UNPACK (x))
#define SCM_FRAME_RETURN_ADDRESS(fp) \
(SCM_FRAME_BYTE_CAST (SCM_FRAME_DATA_ADDRESS (fp)[3]))
#define SCM_FRAME_DYNAMIC_LINK(fp) \
(SCM_FRAME_STACK_CAST (SCM_FRAME_DATA_ADDRESS (fp)[2]))
#define SCM_FRAME_SET_DYNAMIC_LINK(fp, dl) \
((SCM_FRAME_DATA_ADDRESS (fp)[2])) = (SCM)(dl);
#define SCM_FRAME_HEAP_LINK(fp) (SCM_FRAME_DATA_ADDRESS (fp)[1])
#define SCM_FRAME_EXTERNAL_LINK(fp) (SCM_FRAME_DATA_ADDRESS (fp)[0])
#define SCM_FRAME_VARIABLE(fp,i) fp[i]
#define SCM_FRAME_PROGRAM(fp) fp[-1]
/*
* Heap frames
*/
extern scm_t_bits scm_tc16_heap_frame;
#define SCM_HEAP_FRAME_P(x) SCM_SMOB_PREDICATE (scm_tc16_heap_frame, x)
#define SCM_HEAP_FRAME_DATA(f) ((SCM *) SCM_SMOB_DATA (f))
#define SCM_HEAP_FRAME_SELF(f) (SCM_HEAP_FRAME_DATA (f) + 0)
#define SCM_HEAP_FRAME_POINTER(f) (SCM_HEAP_FRAME_DATA (f) + 2)
#define SCM_VALIDATE_HEAP_FRAME(p,x) SCM_MAKE_VALIDATE (p, x, HEAP_FRAME_P)
extern SCM scm_c_make_heap_frame (SCM *fp);
extern void scm_init_frames (void);
#endif /* _SCM_FRAMES_H_ */
/*
Local Variables:
c-file-style: "gnu"
End:
*/
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