3 #ifndef SCM_CONTINUATIONS_H
4 #define SCM_CONTINUATIONS_H
6 /* Copyright (C) 1995,1996,2000,2001, 2006, 2008, 2009, 2010, 2012, 2013 Free Software Foundation, Inc.
8 * This library is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public License
10 * as published by the Free Software Foundation; either version 3 of
11 * the License, or (at your option) any later version.
13 * This library is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with this library; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
26 #include "libguile/__scm.h"
34 #define SCM_CONTINUATIONP(x) \
35 (SCM_PROGRAM_P (x) && SCM_PROGRAM_IS_CONTINUATION (x))
37 /* a continuation SCM is a non-immediate pointing to a heap cell with:
38 word 0: bits 0-15: smob type tag: scm_tc16_continuation.
40 word 1: malloc block containing an scm_t_contregs structure with a
41 tail array of SCM_STACKITEM. the size of the array is stored
42 in the num_stack_items field of the structure.
50 unsigned long backing_store_size
;
52 size_t num_stack_items
; /* size of the saved stack. */
53 SCM root
; /* continuation root identifier. */
54 struct scm_vm
*vp
; /* vm */
55 SCM vm_cont
; /* vm's stack and regs */
57 /* The offset from the live stack location to this copy. This is
58 used to adjust pointers from within the copied stack to the stack
61 Thus, when you read a pointer from the copied stack that points
62 into the live stack, you need to add OFFSET so that it points
67 SCM_STACKITEM stack
[1]; /* copied stack of size num_stack_items. */
73 SCM_INTERNAL SCM
scm_i_make_continuation (int *first
,
76 SCM_INTERNAL
void scm_i_check_continuation (SCM cont
);
77 SCM_INTERNAL
void scm_i_reinstate_continuation (SCM cont
);
79 SCM_INTERNAL SCM
scm_i_continuation_to_frame (SCM cont
);
80 SCM_INTERNAL
struct scm_vm
* scm_i_contregs_vp (SCM contregs
);
81 SCM_INTERNAL SCM
scm_i_contregs_vm_cont (SCM contregs
);
83 SCM_API
void *scm_c_with_continuation_barrier (void *(*func
)(void*), void *);
84 SCM_API SCM
scm_with_continuation_barrier (SCM proc
);
87 scm_i_with_continuation_barrier (scm_t_catch_body body
,
89 scm_t_catch_handler handler
,
91 scm_t_catch_handler pre_unwind_handler
,
92 void *pre_unwind_handler_data
);
94 SCM_INTERNAL
void scm_init_continuations (void);
96 #endif /* SCM_CONTINUATIONS_H */