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da320011a3
* libguile/frames.c (frame-mv-return-address): New accessor. * libguile/frames.h: Update frame diagram. (SCM_FRAME_UPPER_ADDRESS): Update for data area growing by one pointer. (SCM_FRAME_MV_RETURN_ADDRESS): New macro. * libguile/vm-engine.h (NEW_FRAME): Update for frame getting bigger by a pointer. In a normal NEW_FRAME, set the MV return address to NULL, to indicate that this continuation does not accept multiple values. * libguile/vm-i-system.c (tail-call): Update frame replacement code to understand the MV return address. (return): Make room for the MVRA.
129 lines
4.8 KiB
C
129 lines
4.8 KiB
C
/* Copyright (C) 2001 Free Software Foundation, Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this software; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
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* Boston, MA 02111-1307 USA
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*
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* As a special exception, the Free Software Foundation gives permission
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* for additional uses of the text contained in its release of GUILE.
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*
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* The exception is that, if you link the GUILE library with other files
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* to produce an executable, this does not by itself cause the
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* resulting executable to be covered by the GNU General Public License.
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* Your use of that executable is in no way restricted on account of
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* linking the GUILE library code into it.
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*
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* This exception does not however invalidate any other reasons why
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* the executable file might be covered by the GNU General Public License.
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*
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* This exception applies only to the code released by the
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* Free Software Foundation under the name GUILE. If you copy
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* code from other Free Software Foundation releases into a copy of
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* GUILE, as the General Public License permits, the exception does
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* not apply to the code that you add in this way. To avoid misleading
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* anyone as to the status of such modified files, you must delete
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* this exception notice from them.
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*
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* If you write modifications of your own for GUILE, it is your choice
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* whether to permit this exception to apply to your modifications.
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* If you do not wish that, delete this exception notice. */
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#ifndef _SCM_FRAMES_H_
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#define _SCM_FRAMES_H_
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#include <libguile.h>
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#include "programs.h"
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/*
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* VM frames
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*/
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/* VM Frame Layout
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---------------
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| | <- fp + bp->nargs + bp->nlocs + 4
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+------------------+ = SCM_FRAME_UPPER_ADDRESS (fp)
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| Return address |
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| MV return address|
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| Dynamic link |
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| Heap link |
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| External link | <- fp + bp->nargs + bp->nlocs
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| Local variable 1 | = SCM_FRAME_DATA_ADDRESS (fp)
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| Local variable 0 | <- fp + bp->nargs
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| Argument 1 |
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| Argument 0 | <- fp
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| Program | <- fp - 1
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+------------------+ = SCM_FRAME_LOWER_ADDRESS (fp)
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| |
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As can be inferred from this drawing, it is assumed that
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`sizeof (SCM *) == sizeof (SCM)', since pointers (the `link' parts) are
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assumed to be as long as SCM objects. */
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#define SCM_FRAME_DATA_ADDRESS(fp) \
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(fp + SCM_PROGRAM_DATA (SCM_FRAME_PROGRAM (fp))->nargs \
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+ SCM_PROGRAM_DATA (SCM_FRAME_PROGRAM (fp))->nlocs)
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#define SCM_FRAME_UPPER_ADDRESS(fp) (SCM_FRAME_DATA_ADDRESS (fp) + 5)
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#define SCM_FRAME_LOWER_ADDRESS(fp) (fp - 1)
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#define SCM_FRAME_BYTE_CAST(x) ((scm_byte_t *) SCM_UNPACK (x))
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#define SCM_FRAME_STACK_CAST(x) ((SCM *) SCM_UNPACK (x))
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#define SCM_FRAME_RETURN_ADDRESS(fp) \
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(SCM_FRAME_BYTE_CAST (SCM_FRAME_DATA_ADDRESS (fp)[4]))
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#define SCM_FRAME_MV_RETURN_ADDRESS(fp) \
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(SCM_FRAME_BYTE_CAST (SCM_FRAME_DATA_ADDRESS (fp)[3]))
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#define SCM_FRAME_DYNAMIC_LINK(fp) \
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(SCM_FRAME_STACK_CAST (SCM_FRAME_DATA_ADDRESS (fp)[2]))
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#define SCM_FRAME_SET_DYNAMIC_LINK(fp, dl) \
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((SCM_FRAME_DATA_ADDRESS (fp)[2])) = (SCM)(dl);
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#define SCM_FRAME_HEAP_LINK(fp) (SCM_FRAME_DATA_ADDRESS (fp)[1])
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#define SCM_FRAME_EXTERNAL_LINK(fp) (SCM_FRAME_DATA_ADDRESS (fp)[0])
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#define SCM_FRAME_VARIABLE(fp,i) fp[i]
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#define SCM_FRAME_PROGRAM(fp) fp[-1]
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/*
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* Heap frames
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*/
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extern scm_t_bits scm_tc16_heap_frame;
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#define SCM_HEAP_FRAME_P(x) SCM_SMOB_PREDICATE (scm_tc16_heap_frame, x)
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#define SCM_HEAP_FRAME_DATA(f) ((SCM *) SCM_SMOB_DATA (f))
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#define SCM_HEAP_FRAME_SELF(f) (SCM_HEAP_FRAME_DATA (f) + 0)
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#define SCM_HEAP_FRAME_POINTER(f) (SCM_HEAP_FRAME_DATA (f) + 2)
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#define SCM_VALIDATE_HEAP_FRAME(p,x) SCM_MAKE_VALIDATE (p, x, HEAP_FRAME_P)
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extern SCM scm_heap_frame_p (SCM obj);
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extern SCM scm_frame_program (SCM frame);
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extern SCM scm_frame_local_ref (SCM frame, SCM index);
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extern SCM scm_frame_local_set_x (SCM frame, SCM index, SCM val);
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extern SCM scm_frame_return_address (SCM frame);
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extern SCM scm_frame_mv_return_address (SCM frame);
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extern SCM scm_frame_dynamic_link (SCM frame);
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extern SCM scm_frame_external_link (SCM frame);
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extern SCM scm_c_make_heap_frame (SCM *fp);
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extern void scm_bootstrap_frames (void);
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extern void scm_init_frames (void);
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#endif /* _SCM_FRAMES_H_ */
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/*
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Local Variables:
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c-file-style: "gnu"
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End:
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*/
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