X-Git-Url: http://git.hcoop.net/bpt/guile.git/blobdiff_plain/82892beda5c053715bc3ec7063af4a129f52c5f9..9bc6fb0a7d91ae9a6c57cedb76022043db413ba5:/libguile/continuations.h

diff --git a/libguile/continuations.h b/libguile/continuations.h
index f37058366..d8db12ff0 100644
--- a/libguile/continuations.h
+++ b/libguile/continuations.h
@@ -1,19 +1,20 @@
 /* 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, Inc., 59 Temple Place, Suite 330,
@@ -42,37 +43,72 @@
  * 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"
 
+#ifdef __ia64__
+#include <sys/ucontext.h>
+extern unsigned long * __libc_ia64_register_backing_store_base;
+#endif /* __ia64__ */
 
 
+/* 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
-} scm_contregs;
+  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) (((scm_contregs *)SCM_CHARS(x))->jmpbuf)
-#define SCM_SETJMPBUF SCM_SETCDR
-#define SCM_DYNENV(x) (((scm_contregs *)SCM_CHARS(x))->dynenv)
-#define SCM_THROW_VALUE(x) (((scm_contregs *)SCM_CHARS(x))->throw_value)
-#define SCM_BASE(x) (((scm_contregs *)SCM_CHARS(x))->base)
-#define SCM_SEQ(x) (((scm_contregs *)SCM_CHARS(x))->seq)
-#define SCM_DFRAME(x) (((scm_contregs *)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)
 
 
 
-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:
+*/