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5f144b105d
custom tc7 type. This will make it easier to support R5RS multiple value continuations, without the use of a Scheme-level wrapper. * continuations.c (scm_tc16_continuation, continuation_mark, continuation_free, continuation_print, continuation_apply): new SMOB support. (scm_make_continuation): new procedure, replaces scm_make_cont with a different interface. (copy_stack_and_call, scm_dynthrow, scm_init_continuations): rewritten. (CHEAP_CONTINUATIONS): removed non-working code completely. (scm_call_continuation): removed. * continuations.h (struct scm_contregs): add num_stack_items and stack fields. previously stack was stored following this struct: use a tail array instead. (SCM_CONTINUATIONP): new macro. (SCM_CONTINUATION_LENGTH, SCM_SET_CONTINUATION_LENGTH): rewritten. (SCM_SET_CONTREGS): removed. * tags.h: removed scm_tc7_contin (was tag 61). * debug.c, gc.c, hash.c, print.c, procprop.c, procs.c: removed scm_tc7_contin support. * eval.c: use scm_make_continuation instead of scm_make_cont. don't set jump buffers here. remove scm_tc7_contin support. * init.c, root.c: create SMOB continuation for rootcont instead of scm_tc7_contin. call scm_init_continuations before scm_init_root. * root.c: remove support for static jmpbuf. It's not used by default and I broke it. create SMOB continuation for rootcont. * stacks.c: use SCM_CONTINUATIONP.
111 lines
3.9 KiB
C
111 lines
3.9 KiB
C
/* classes: h_files */
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#ifndef CONTINUATIONSH
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#define CONTINUATIONSH
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/* Copyright (C) 1995,1996, 2000 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 "libguile/__scm.h"
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/* a continuation SCM is a non-immediate pointing to a heap cell with:
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word 0: bits 0-15: unused.
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bits 16-31: smob type tag: scm_tc16_continuation.
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word 1: malloc block containing an scm_contregs structure with a
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tail array of SCM_STACKITEM. the size of the array is stored
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in the num_stack_items field of the structure.
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*/
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extern scm_bits_t scm_tc16_continuation;
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typedef struct
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{
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SCM throw_value;
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jmp_buf jmpbuf;
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SCM dynenv;
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SCM_STACKITEM *base; /* base of the live stack, before it was saved. */
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scm_sizet num_stack_items; /* size of the saved stack. */
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unsigned long seq; /* dynamic root identifier. */
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#ifdef DEBUG_EXTENSIONS
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/* the most recently created debug frame on the live stack, before
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it was saved. */
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struct scm_debug_frame *dframe;
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#endif
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SCM_STACKITEM stack[1]; /* copied stack of size num_stack_items. */
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} scm_contregs;
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#define SCM_CONTINUATIONP(x)\
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(SCM_NIMP (x) && (SCM_TYP16 (x) == scm_tc16_continuation))
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#define SCM_CONTREGS(x) ((scm_contregs *) SCM_CELL_WORD_1 (x))
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#define SCM_CONTINUATION_LENGTH(x) (SCM_CONTREGS (x)->num_stack_items)
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#define SCM_SET_CONTINUATION_LENGTH(x,n)\
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(SCM_CONTREGS (x)->num_stack_items = (n))
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#define SCM_JMPBUF(x) ((SCM_CONTREGS (x))->jmpbuf)
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#define SCM_DYNENV(x) ((SCM_CONTREGS (x))->dynenv)
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#define SCM_THROW_VALUE(x) ((SCM_CONTREGS (x))->throw_value)
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#define SCM_BASE(x) ((SCM_CONTREGS (x))->base)
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#define SCM_SEQ(x) ((SCM_CONTREGS (x))->seq)
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#define SCM_DFRAME(x) ((SCM_CONTREGS (x))->dframe)
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extern SCM scm_make_continuation (int *first);
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extern void scm_init_continuations (void);
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#if (SCM_DEBUG_DEPRECATED == 0)
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#define SCM_SETJMPBUF(x, r) (SCM_SET_CONTREGS ((x), (r)))
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#endif /* SCM_DEBUG_DEPRECATED == 0 */
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#endif /* CONTINUATIONSH */
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/*
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Local Variables:
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c-file-style: "gnu"
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End:
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*/
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