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-rw-r--r--libguile/continuations.c212
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diff --git a/libguile/continuations.c b/libguile/continuations.c
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--- a/libguile/continuations.c
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-/* Copyright (C) 1995,1996 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, 675 Mass Ave, Cambridge, MA 02139, USA.
- *
- * As a special exception, the Free Software Foundation gives permission
- * for additional uses of the text contained in its release of GUILE.
- *
- * The exception is that, if you link the GUILE library with other files
- * to produce an executable, this does not by itself cause the
- * resulting executable to be covered by the GNU General Public License.
- * Your use of that executable is in no way restricted on account of
- * linking the GUILE library code into it.
- *
- * This exception does not however invalidate any other reasons why
- * the executable file might be covered by the GNU General Public License.
- *
- * This exception applies only to the code released by the
- * Free Software Foundation under the name GUILE. If you copy
- * code from other Free Software Foundation releases into a copy of
- * GUILE, as the General Public License permits, the exception does
- * not apply to the code that you add in this way. To avoid misleading
- * anyone as to the status of such modified files, you must delete
- * this exception notice from them.
- *
- * 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 <stdio.h>
-#include "_scm.h"
-#include "stackchk.h"
-#ifdef DEBUG_EXTENSIONS
-#include "debug.h"
-#endif
-#include "dynwind.h"
-
-#include "continuations.h"
-
-
-/* {Continuations}
- */
-
-static char s_cont[] = "continuation";
-
-
-SCM
-scm_make_cont (answer)
- SCM * answer;
-{
- long j;
- SCM cont;
-
-#ifdef CHEAP_CONTINUATIONS
- SCM_NEWCELL (cont);
- *answer = cont;
- SCM_DEFER_INTS;
- SCM_SETJMPBUF (cont, scm_must_malloc ((long) sizeof (scm_contregs), s_cont));
- SCM_SETCAR (cont, scm_tc7_contin);
- SCM_DYNENV (cont) = scm_dynwinds;
- SCM_THROW_VALUE = SCM_EOL;
- SCM_BASE (cont) = SCM_BASE (rootcont);
- SCM_SEQ (cont) = SCM_SEQ (rootcont);
- SCM_ALLOW_INTS;
-#else
- register SCM_STACKITEM *src, *dst;
-
-#if 0
- {
- SCM winds;
-
- for (winds = scm_dynwinds; winds != SCM_EOL; winds = SCM_CDR (winds))
- {
- if (SCM_INUMP (SCM_CAR (winds)))
- {
- scm_relocate_chunk_to_heap (SCM_CAR (winds));
- }
- }
- }
-#endif
-
- SCM_NEWCELL (cont);
- *answer = cont;
- SCM_DEFER_INTS;
- SCM_FLUSH_REGISTER_WINDOWS;
- j = scm_stack_size (SCM_BASE (scm_rootcont));
- SCM_SETJMPBUF (cont,
- scm_must_malloc ((long) (sizeof (scm_contregs) + j * sizeof (SCM_STACKITEM)),
- s_cont));
- SCM_SETLENGTH (cont, j, scm_tc7_contin);
- SCM_DYNENV (cont) = scm_dynwinds;
- SCM_THROW_VALUE (cont) = SCM_EOL;
- src = SCM_BASE (cont) = SCM_BASE (scm_rootcont);
- SCM_SEQ (cont) = SCM_SEQ (scm_rootcont);
- SCM_ALLOW_INTS;
-#ifndef SCM_STACK_GROWS_UP
- src -= SCM_LENGTH (cont);
-#endif /* ndef SCM_STACK_GROWS_UP */
- dst = (SCM_STACKITEM *) (SCM_CHARS (cont) + sizeof (scm_contregs));
- for (j = SCM_LENGTH (cont); 0 <= --j;)
- *dst++ = *src++;
-#endif /* def CHEAP_CONTINUATIONS */
-#ifdef DEBUG_EXTENSIONS
- SCM_DFRAME (cont) = scm_last_debug_frame;
-#endif
- return cont;
-}
-
-/* Grow the stack so that there is room */
-/* to copy in the continuation. Then */
-#ifndef CHEAP_CONTINUATIONS
-
-static void grow_throw SCM_P ((SCM *a));
-
-static void
-grow_throw (a)
- SCM *a;
-{ /* retry the throw. */
- SCM growth[100];
- growth[0] = a[0];
- growth[1] = a[1];
- growth[2] = a[2] + 1;
- growth[3] = (SCM) a;
- scm_dynthrow (growth);
-}
-#endif /* ndef CHEAP_CONTINUATIONS */
-
-
-void
-scm_dynthrow (a)
- SCM *a;
-{
- SCM cont = a[0], val = a[1];
-#ifndef CHEAP_CONTINUATIONS
- register long j;
- register SCM_STACKITEM *src, *dst = SCM_BASE (scm_rootcont);
-#ifdef SCM_STACK_GROWS_UP
- if (a[2] && (a - ((SCM *) a[3]) < 100))
-#else
- if (a[2] && (((SCM *) a[3]) - a < 100))
-#endif
- fputs ("grow_throw: check if SCM growth[100]; being optimized out\n",
- stderr);
- /* if (a[2]) fprintf(stderr, " ct = %ld, dist = %ld\n",
- a[2], (((SCM *)a[3]) - a)); */
-#ifdef SCM_STACK_GROWS_UP
- if (SCM_PTR_GE (dst + SCM_LENGTH (cont), (SCM_STACKITEM *) & a))
- grow_throw (a);
-#else
- dst -= SCM_LENGTH (cont);
- if (SCM_PTR_LE (dst, (SCM_STACKITEM *) & a))
- grow_throw (a);
-#endif /* def SCM_STACK_GROWS_UP */
- SCM_FLUSH_REGISTER_WINDOWS;
- src = (SCM_STACKITEM *) (SCM_CHARS (cont) + sizeof (scm_contregs));
- for (j = SCM_LENGTH (cont); 0 <= --j;)
- *dst++ = *src++;
-#ifdef sparc /* clear out stack up to this stackframe */
- /* maybe this would help, maybe not */
-/* bzero((void *)&a, sizeof(SCM_STACKITEM) * (((SCM_STACKITEM *)&a) -
- (dst - SCM_LENGTH(cont)))) */
-#endif
-#endif /* ndef CHEAP_CONTINUATIONS */
-#ifdef DEBUG_EXTENSIONS
- scm_last_debug_frame = SCM_DFRAME (cont);
-#endif
- SCM_THROW_VALUE(cont) = val;
- longjmp (SCM_JMPBUF (cont), 1);
-}
-
-
-SCM
-scm_call_continuation (cont, val)
- SCM cont;
- SCM val;
-{
- SCM a[3];
- a[0] = cont;
- a[1] = val;
- a[2] = 0;
- if ( (SCM_SEQ (cont) != SCM_SEQ (scm_rootcont))
- || (SCM_BASE (cont) != SCM_BASE (scm_rootcont))) /* base compare not needed */
- scm_wta (cont, "continuation from wrong top level", s_cont);
-
- scm_dowinds (SCM_DYNENV (cont),
- scm_ilength (scm_dynwinds) - scm_ilength (SCM_DYNENV (cont)));
-
- scm_dynthrow (a);
- return SCM_UNSPECIFIED; /* not reached */
-}
-
-
-
-void
-scm_init_continuations ()
-{
-#include "continuations.x"
-}
-