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7dc6e7547a
continuations.c, debug.c, debug.h, dynl-dl.c, dynl.c, dynl.h, dynwind.c, dynwind.h, eq.c, error.c, error.h, eval.c, eval.h, feature.c, filesys.c, filesys.h, fports.c, fports.h, gc.c, gc.h, genio.c, genio.h, gh.h, gh_data.c, gsubr.c, gsubr.h, hash.c, hashtab.c, init.c, init.h, ioext.c, ioext.h, kw.c, libguile.h, list.c, list.h, load.c, load.h, mallocs.c, markers.c, mit-pthreads.c, net_db.c, numbers.c, numbers.h, options.c, ports.c, ports.h, posix.c, posix.h, print.c, print.h, procprop.c, procprop.h, procs.c, procs.h, ramap.c, ramap.h, regex-posix.c, regex-posix.h, root.c, root.h, scmsigs.c, scmsigs.h, script.c, script.h, simpos.c, simpos.h, smob.c, smob.h, snarf.h, socket.c, srcprop.c, stackchk.c, stackchk.h, stacks.c, stime.c, stime.h, strings.c, strings.h, strports.c, struct.c, struct.h, symbols.c, symbols.h, tags.h, threads.c, throw.h, unif.c, variable.c, vectors.c, vectors.h, version.h, vports.c, weaks.c: Update copyright years.
244 lines
6.3 KiB
C
244 lines
6.3 KiB
C
/* Copyright (C) 1995,1996,1998 Free Software Foundation, Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this software; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
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* Boston, MA 02111-1307 USA
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*
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* As a special exception, the Free Software Foundation gives permission
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* for additional uses of the text contained in its release of GUILE.
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*
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* The exception is that, if you link the GUILE library with other files
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* to produce an executable, this does not by itself cause the
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* resulting executable to be covered by the GNU General Public License.
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* Your use of that executable is in no way restricted on account of
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* linking the GUILE library code into it.
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*
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* This exception does not however invalidate any other reasons why
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* the executable file might be covered by the GNU General Public License.
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*
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* This exception applies only to the code released by the
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* Free Software Foundation under the name GUILE. If you copy
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* code from other Free Software Foundation releases into a copy of
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* GUILE, as the General Public License permits, the exception does
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* not apply to the code that you add in this way. To avoid misleading
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* anyone as to the status of such modified files, you must delete
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* this exception notice from them.
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*
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* If you write modifications of your own for GUILE, it is your choice
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* whether to permit this exception to apply to your modifications.
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* If you do not wish that, delete this exception notice. */
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#include <stdio.h>
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#include "_scm.h"
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#include "eval.h"
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#include "alist.h"
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#include "fluids.h"
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#include "genio.h"
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#include "smob.h"
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#include "dynwind.h"
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/* {Dynamic wind}
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Things that can be on the wind list:
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(enter-proc . leave-proc) dynamic-wind
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(tag . jmpbuf) catch
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(tag . lazy-catch) lazy-catch
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tag is either a symbol or a boolean
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((fluid ...) . (value ...)) with-fluids
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*/
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SCM_PROC(s_dynamic_wind, "dynamic-wind", 3, 0, 0, scm_dynamic_wind);
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SCM
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scm_dynamic_wind (thunk1, thunk2, thunk3)
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SCM thunk1;
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SCM thunk2;
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SCM thunk3;
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{
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SCM ans;
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scm_apply (thunk1, SCM_EOL, SCM_EOL);
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scm_dynwinds = scm_acons (thunk1, thunk3, scm_dynwinds);
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ans = scm_apply (thunk2, SCM_EOL, SCM_EOL);
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scm_dynwinds = SCM_CDR (scm_dynwinds);
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scm_apply (thunk3, SCM_EOL, SCM_EOL);
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return ans;
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}
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/* The implementation of a C-callable dynamic-wind,
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* scm_internal_dynamic_wind, requires packaging of C pointers in a
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* smob. Objects of this type are pushed onto the dynwind chain.
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*/
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typedef struct guardsmem {
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scm_guard_t before;
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scm_guard_t after;
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void *data;
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} guardsmem;
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#define SCM_GUARDSMEM(obj) ((guardsmem *) SCM_CDR (obj))
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#define SCM_BEFORE_GUARD(obj) (SCM_GUARDSMEM (obj)->before)
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#define SCM_AFTER_GUARD(obj) (SCM_GUARDSMEM (obj)->after)
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#define SCM_GUARD_DATA(obj) (SCM_GUARDSMEM (obj)->data)
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#define SCM_GUARDSP(obj) (SCM_CAR (obj) == tc16_guards)
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static long tc16_guards;
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static scm_sizet
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freeguards (SCM guards)
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{
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scm_must_free ((char *) SCM_CDR (guards));
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return sizeof (guardsmem);
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}
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static int
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printguards (SCM exp, SCM port, scm_print_state *pstate)
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{
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scm_puts ("#<guards ", port);
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scm_intprint (SCM_CDR (exp), 16, port);
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scm_putc ('>', port);
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return 1;
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}
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static scm_smobfuns guardsmob = {
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0,
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freeguards,
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printguards,
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0
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};
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SCM
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scm_internal_dynamic_wind (scm_guard_t before,
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scm_inner_t inner,
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scm_guard_t after,
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void *inner_data,
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void *guard_data)
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{
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SCM guards, ans;
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guardsmem *g;
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before (guard_data);
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SCM_NEWCELL (guards);
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SCM_DEFER_INTS;
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g = (guardsmem *) scm_must_malloc (sizeof (*g), "guards");
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g->before = before;
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g->after = after;
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g->data = guard_data;
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SCM_SETCDR (guards, g);
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SCM_SETCAR (guards, tc16_guards);
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SCM_ALLOW_INTS;
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scm_dynwinds = scm_acons (guards, SCM_BOOL_F, scm_dynwinds);
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ans = inner (inner_data);
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scm_dynwinds = SCM_CDR (scm_dynwinds);
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after (guard_data);
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return ans;
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}
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#ifdef GUILE_DEBUG
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SCM_PROC (s_wind_chain, "wind-chain", 0, 0, 0, scm_wind_chain);
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SCM
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scm_wind_chain ()
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{
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return scm_dynwinds;
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}
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#endif
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void
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scm_dowinds (to, delta)
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SCM to;
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long delta;
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{
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tail:
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if (scm_dynwinds == to);
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else if (0 > delta)
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{
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SCM wind_elt;
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SCM wind_key;
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scm_dowinds (SCM_CDR (to), 1 + delta);
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wind_elt = SCM_CAR (to);
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#if 0
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if (SCM_INUMP (wind_elt))
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{
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scm_cross_dynwind_binding_scope (wind_elt, 0);
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}
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else
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#endif
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{
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wind_key = SCM_CAR (wind_elt);
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if (!(SCM_NIMP (wind_key) && SCM_SYMBOLP (wind_key))
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&& (wind_key != SCM_BOOL_F)
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&& (wind_key != SCM_BOOL_T))
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{
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if (SCM_NIMP (wind_key) && SCM_CONSP (wind_key))
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scm_swap_fluids (wind_key, SCM_CDR (wind_elt));
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else if (SCM_NIMP (wind_key) && SCM_GUARDSP (wind_key))
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SCM_BEFORE_GUARD (wind_key) (SCM_GUARD_DATA (wind_key));
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else
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scm_apply (wind_key, SCM_EOL, SCM_EOL);
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}
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}
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scm_dynwinds = to;
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}
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else
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{
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SCM from;
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SCM wind_elt;
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SCM wind_key;
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from = SCM_CDR (SCM_CAR (scm_dynwinds));
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wind_elt = SCM_CAR (scm_dynwinds);
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scm_dynwinds = SCM_CDR (scm_dynwinds);
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#if 0
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if (SCM_INUMP (wind_elt))
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{
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scm_cross_dynwind_binding_scope (wind_elt, 0);
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}
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else
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#endif
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{
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wind_key = SCM_CAR (wind_elt);
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if (!(SCM_NIMP (wind_key) && SCM_SYMBOLP (wind_key))
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&& (wind_key != SCM_BOOL_F)
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&& (wind_key != SCM_BOOL_T))
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{
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if (SCM_NIMP (wind_key) && SCM_CONSP (wind_key))
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scm_swap_fluids_reverse (wind_key, from);
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else if (SCM_NIMP (wind_key) && SCM_GUARDSP (wind_key))
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SCM_AFTER_GUARD (wind_key) (SCM_GUARD_DATA (wind_key));
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else
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scm_apply (from, SCM_EOL, SCM_EOL);
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}
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}
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delta--;
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goto tail; /* scm_dowinds(to, delta-1); */
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}
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}
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void
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scm_init_dynwind ()
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{
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tc16_guards = scm_newsmob (&guardsmob);
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#include "dynwind.x"
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}
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