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90 lines
2.8 KiB
C
90 lines
2.8 KiB
C
/* classes: h_files */
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#ifndef SCM_CONTINUATIONS_H
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#define SCM_CONTINUATIONS_H
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/* Copyright (C) 1995,1996,2000,2001 Free Software Foundation, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "libguile/__scm.h"
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#ifdef __ia64__
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#include <signal.h>
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#include <sys/ucontext.h>
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extern unsigned long * __libc_ia64_register_backing_store_base;
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#endif /* __ia64__ */
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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: smob type tag: scm_tc16_continuation.
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bits 16-31: unused.
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word 1: malloc block containing an scm_t_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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SCM_API scm_t_bits 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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#ifdef __ia64__
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ucontext_t ctx;
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void *backing_store;
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unsigned long backing_store_size;
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#endif /* __ia64__ */
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SCM_STACKITEM *base; /* base of the live stack, before it was saved. */
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size_t num_stack_items; /* size of the saved stack. */
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unsigned long seq; /* dynamic root identifier. */
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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_t_debug_frame *dframe;
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SCM_STACKITEM stack[1]; /* copied stack of size num_stack_items. */
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} scm_t_contregs;
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#define SCM_CONTINUATIONP(x) SCM_TYP16_PREDICATE (scm_tc16_continuation, x)
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#define SCM_CONTREGS(x) ((scm_t_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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SCM_API SCM scm_make_continuation (int *first);
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SCM_API void scm_init_continuations (void);
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#endif /* SCM_CONTINUATIONS_H */
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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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