/* classes: h_files */
-#ifndef CONTINUATIONSH
-#define CONTINUATIONSH
-/* Copyright (C) 1995,1996 Free Software Foundation, Inc.
- *
+#ifndef SCM_CONTINUATIONS_H
+#define SCM_CONTINUATIONS_H
+
+/* Copyright (C) 1995,1996,2000,2001 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, 675 Mass Ave, Cambridge, MA 02139, USA.
+ * 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.
*
* 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.
- */
+ * If you do not wish that, delete this exception notice. */
+
\f
+
#include "libguile/__scm.h"
+#ifdef __ia64__
+#include <sys/ucontext.h>
+extern unsigned long * __libc_ia64_register_backing_store_base;
+#endif /* __ia64__ */
\f
+/* a continuation SCM is a non-immediate pointing to a heap cell with:
+ word 0: bits 0-15: smob type tag: scm_tc16_continuation.
+ bits 16-31: unused.
+ word 1: malloc block containing an scm_t_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.
+*/
+
+SCM_API scm_t_bits scm_tc16_continuation;
+
typedef struct
{
SCM throw_value;
jmp_buf jmpbuf;
SCM dynenv;
- SCM_STACKITEM *base;
- unsigned long seq;
+#ifdef __ia64__
+ ucontext_t ctx;
+ void *backing_store;
+ unsigned long backing_store_size;
+#endif /* __ia64__ */
+ SCM_STACKITEM *base; /* base of the live stack, before it was saved. */
+ size_t num_stack_items; /* size of the saved stack. */
+ unsigned long seq; /* dynamic root identifier. */
#ifdef DEBUG_EXTENSIONS
- struct scm_debug_frame *dframe;
+ /* the most recently created debug frame on the live stack, before
+ it was saved. */
+ struct scm_t_debug_frame *dframe;
#endif
-} regs;
+ SCM_STACKITEM stack[1]; /* copied stack of size num_stack_items. */
+} scm_t_contregs;
+
+#define SCM_CONTINUATIONP(x) SCM_TYP16_PREDICATE (scm_tc16_continuation, x)
-#define SCM_JMPBUF(x) (((regs *)SCM_CHARS(x))->jmpbuf)
-#define SCM_SETJMPBUF SCM_SETCDR
-#define SCM_DYNENV(x) (((regs *)SCM_CHARS(x))->dynenv)
-#define SCM_THROW_VALUE(x) (((regs *)SCM_CHARS(x))->throw_value)
-#define SCM_BASE(x) (((regs *)SCM_CHARS(x))->base)
-#define SCM_SEQ(x) (((regs *)SCM_CHARS(x))->seq)
-#define SCM_DFRAME(x) (((regs *)SCM_CHARS(x))->dframe)
+#define SCM_CONTREGS(x) ((scm_t_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)
\f
-extern SCM scm_make_cont SCM_P ((SCM * answer));
-extern void scm_dynthrow SCM_P ((SCM *a));
-extern SCM scm_call_continuation SCM_P ((SCM cont, SCM val));
-extern void scm_init_continuations SCM_P ((void));
+SCM_API SCM scm_make_continuation (int *first);
+SCM_API void scm_init_continuations (void);
+
+#endif /* SCM_CONTINUATIONS_H */
-#endif /* CONTINUATIONSH */
+/*
+ Local Variables:
+ c-file-style: "gnu"
+ End:
+*/