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/* Copyright (C) 2010 Free Software Foundation, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 3 of
* the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301 USA
*/
#if HAVE_CONFIG_H
# include <config.h>
#endif
#include "libguile/_scm.h"
#include "libguile/control.h"
#include "libguile/vm.h"
SCM scm_atcontrol (SCM, SCM, SCM);
SCM_DEFINE (scm_atcontrol, "@control", 3, 0, 0,
(SCM tag, SCM type, SCM args),
"Transfer control to the handler of a delimited continuation.")
#define FUNC_NAME s_scm_atcontrol
{
abort ();
return SCM_UNSPECIFIED;
}
#undef FUNC_NAME
SCM scm_atprompt (SCM, SCM, SCM, SCM);
SCM_DEFINE (scm_atprompt, "@prompt", 4, 0, 0,
(SCM tag, SCM thunk, SCM handler, SCM pre_unwind_handler),
"Begin a delimited continuation.")
#define FUNC_NAME s_scm_atprompt
{
abort ();
return SCM_UNSPECIFIED;
}
#undef FUNC_NAME
SCM
scm_c_make_prompt (SCM vm, SCM k, SCM handler, scm_t_uint8 inline_handler_p,
scm_t_uint8 escape_only_p)
{
scm_t_bits tag;
SCM ret;
struct scm_prompt_registers *regs;
tag = scm_tc7_prompt;
if (inline_handler_p)
tag |= SCM_F_PROMPT_INLINE;
if (escape_only_p)
tag |= SCM_F_PROMPT_ESCAPE;
ret = scm_words (tag, 5);
regs = scm_gc_malloc_pointerless (sizeof (*regs), "prompt registers");
regs->fp = SCM_VM_DATA (vm)->fp;
regs->sp = SCM_VM_DATA (vm)->sp;
regs->ip = SCM_VM_DATA (vm)->ip;
SCM_SET_CELL_OBJECT (ret, 1, k);
SCM_SET_CELL_WORD (ret, 2, (scm_t_bits)regs);
SCM_SET_CELL_OBJECT (ret, 3, scm_i_dynwinds ());
SCM_SET_CELL_OBJECT (ret, 4, handler);
return ret;
}
static void
scm_init_control (void)
{
#ifndef SCM_MAGIC_SNARFER
#include "libguile/control.x"
#endif
}
void
scm_register_control (void)
{
scm_c_register_extension ("libguile", "scm_init_control",
(scm_t_extension_init_func)scm_init_control,
NULL);
}
/*
Local Variables:
c-file-style: "gnu"
End:
*/
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