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/* Copyright 1995-1996,1998-2001,2003-2004,2006,2008,2010-2012,2018
Free Software Foundation, Inc.
This file is part of Guile.
Guile 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.
Guile 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 Guile. If not, see
<https://www.gnu.org/licenses/>. */
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <assert.h>
#include "boolean.h"
#include "dynstack.h"
#include "eval.h"
#include "pairs.h"
#include "ports.h"
#include "threads.h"
#include "variable.h"
#include "dynwind.h"
SCM
scm_dynamic_wind (SCM in_guard, SCM thunk, SCM out_guard)
#define FUNC_NAME "dynamic-wind"
{
SCM ans;
scm_thread *thread = SCM_I_CURRENT_THREAD;
SCM_ASSERT (scm_is_true (scm_thunk_p (out_guard)), out_guard,
SCM_ARG3, FUNC_NAME);
scm_call_0 (in_guard);
scm_dynstack_push_dynwind (&thread->dynstack, in_guard, out_guard);
ans = scm_call_0 (thunk);
scm_dynstack_pop (&thread->dynstack);
scm_call_0 (out_guard);
return ans;
}
#undef FUNC_NAME
void
scm_dynwind_begin (scm_t_dynwind_flags flags)
{
scm_thread *thread = SCM_I_CURRENT_THREAD;
scm_dynstack_push_frame (&thread->dynstack, flags);
}
void
scm_dynwind_end (void)
{
scm_dynstack_unwind_frame (&SCM_I_CURRENT_THREAD->dynstack);
}
void
scm_dynwind_unwind_handler (void (*proc) (void *), void *data,
scm_t_wind_flags flags)
{
scm_thread *thread = SCM_I_CURRENT_THREAD;
scm_t_dynstack *dynstack = &thread->dynstack;
scm_dynstack_push_unwinder (dynstack, flags, proc, data);
}
void
scm_dynwind_rewind_handler (void (*proc) (void *), void *data,
scm_t_wind_flags flags)
{
scm_thread *thread = SCM_I_CURRENT_THREAD;
scm_t_dynstack *dynstack = &thread->dynstack;
scm_dynstack_push_rewinder (dynstack, 0, proc, data);
if (flags & SCM_F_WIND_EXPLICITLY)
proc (data);
}
void
scm_dynwind_unwind_handler_with_scm (void (*proc) (SCM), SCM data,
scm_t_wind_flags flags)
{
/* FIXME: This is not a safe cast. */
scm_dynwind_unwind_handler ((scm_t_guard) proc, SCM2PTR (data), flags);
}
void
scm_dynwind_rewind_handler_with_scm (void (*proc) (SCM), SCM data,
scm_t_wind_flags flags)
{
/* FIXME: This is not a safe cast. */
scm_dynwind_rewind_handler ((scm_t_guard) proc, SCM2PTR (data), flags);
}
void
scm_dynwind_free (void *mem)
{
scm_dynwind_unwind_handler (free, mem, SCM_F_WIND_EXPLICITLY);
}
void
scm_swap_bindings (SCM vars, SCM vals)
{
SCM tmp;
while (scm_is_pair (vals))
{
tmp = SCM_VARIABLE_REF (SCM_CAR (vars));
SCM_VARIABLE_SET (SCM_CAR (vars), SCM_CAR (vals));
SCM_SETCAR (vals, tmp);
vars = SCM_CDR (vars);
vals = SCM_CDR (vals);
}
}
void
scm_init_dynwind ()
{
#include "dynwind.x"
}
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