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Diffstat (limited to 'src/frames.h')
| -rw-r--r-- | src/frames.h | 116 |
1 files changed, 116 insertions, 0 deletions
diff --git a/src/frames.h b/src/frames.h new file mode 100644 index 000000000..3803ffdc2 --- /dev/null +++ b/src/frames.h @@ -0,0 +1,116 @@ +/* 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: +*/ |