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/* classes: h_files */
#ifndef CONTINUATIONSH
#define CONTINUATIONSH
/* Copyright (C) 1995,1996, 2000 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. */
#include "libguile/__scm.h"
/* a continuation SCM is a non-immediate pointing to a heap cell with:
word 0: bits 0-15: unused.
bits 16-31: smob type tag: scm_tc16_continuation.
word 1: malloc block containing an scm_contregs structure with a
tail array of SCM_STACKITEM. the size of the array is stored
in the num_stack_items field of the structure.
*/
extern scm_bits_t scm_tc16_continuation;
typedef struct
{
SCM throw_value;
jmp_buf jmpbuf;
SCM dynenv;
SCM_STACKITEM *base; /* base of the live stack, before it was saved. */
scm_sizet num_stack_items; /* size of the saved stack. */
unsigned long seq; /* dynamic root identifier. */
#ifdef DEBUG_EXTENSIONS
/* the most recently created debug frame on the live stack, before
it was saved. */
struct scm_debug_frame *dframe;
#endif
SCM_STACKITEM stack[1]; /* copied stack of size num_stack_items. */
} scm_contregs;
#define SCM_CONTINUATIONP(x) SCM_TYP16_PREDICATE (scm_tc16_continuation, x)
#define SCM_CONTREGS(x) ((scm_contregs *) SCM_CELL_WORD_1 (x))
#define SCM_CONTINUATION_LENGTH(x) (SCM_CONTREGS (x)->num_stack_items)
#define SCM_SET_CONTINUATION_LENGTH(x,n)\
(SCM_CONTREGS (x)->num_stack_items = (n))
#define SCM_JMPBUF(x) ((SCM_CONTREGS (x))->jmpbuf)
#define SCM_DYNENV(x) ((SCM_CONTREGS (x))->dynenv)
#define SCM_THROW_VALUE(x) ((SCM_CONTREGS (x))->throw_value)
#define SCM_BASE(x) ((SCM_CONTREGS (x))->base)
#define SCM_SEQ(x) ((SCM_CONTREGS (x))->seq)
#define SCM_DFRAME(x) ((SCM_CONTREGS (x))->dframe)
extern SCM scm_make_continuation (int *first);
extern void scm_init_continuations (void);
#endif /* CONTINUATIONSH */
/*
Local Variables:
c-file-style: "gnu"
End:
*/
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