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adaf86ec49
* libguile/tags.h (scm_tc7_prompt): Allocate a tc7 for prompt objects. * libguile/control.h (SCM_F_PROMPT_INLINE, SCM_F_PROMPT_ESCAPE) (SCM_PROMPT_P, SCM_PROMPT_FLAGS, SCM_PROMPT_INLINE_P) (SCM_PROMPT_ESCAPE_P, SCM_PROMPT_TAG, SCM_PROMPT_REGISTERS) (SCM_PROMPT_DYNENV, SCM_PROMPT_HANDLER) (SCM_PROMPT_PRE_UNWIND_HANDLER, SCM_PROMPT_SETJMP) (struct scm_prompt_registers): * libguile/control.c (scm_c_make_prompt): Flesh out a simple prompts implementation. * libguile/vm-i-system.c (prompt): Wire up the implementation. * libguile/vm.c: Add a needed #include.
103 lines
2.6 KiB
C
103 lines
2.6 KiB
C
/* Copyright (C) 2010 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 License
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* as published by the Free Software Foundation; either version 3 of
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* 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, but
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* 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., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301 USA
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*/
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#if HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include "libguile/_scm.h"
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#include "libguile/control.h"
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#include "libguile/vm.h"
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SCM scm_atcontrol (SCM, SCM, SCM);
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SCM_DEFINE (scm_atcontrol, "@control", 3, 0, 0,
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(SCM tag, SCM type, SCM args),
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"Transfer control to the handler of a delimited continuation.")
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#define FUNC_NAME s_scm_atcontrol
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{
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abort ();
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return SCM_UNSPECIFIED;
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}
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#undef FUNC_NAME
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SCM scm_atprompt (SCM, SCM, SCM, SCM);
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SCM_DEFINE (scm_atprompt, "@prompt", 4, 0, 0,
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(SCM tag, SCM thunk, SCM handler, SCM pre_unwind_handler),
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"Begin a delimited continuation.")
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#define FUNC_NAME s_scm_atprompt
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{
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abort ();
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return SCM_UNSPECIFIED;
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}
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#undef FUNC_NAME
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SCM
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scm_c_make_prompt (SCM vm, SCM k, SCM handler, SCM pre_unwind,
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scm_t_uint8 inline_p, scm_t_uint8 escape_only_p)
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{
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scm_t_bits tag;
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SCM ret;
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struct scm_prompt_registers *regs;
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tag = scm_tc7_prompt;
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if (inline_p)
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tag |= SCM_F_PROMPT_INLINE;
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if (escape_only_p)
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tag |= SCM_F_PROMPT_ESCAPE;
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ret = scm_words (tag, 6);
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regs = scm_gc_malloc_pointerless (sizeof (*regs), "prompt registers");
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regs->fp = SCM_VM_DATA (vm)->fp;
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regs->sp = SCM_VM_DATA (vm)->sp;
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regs->ip = SCM_VM_DATA (vm)->ip;
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SCM_SET_CELL_OBJECT (ret, 1, k);
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SCM_SET_CELL_WORD (ret, 2, (scm_t_bits)regs);
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SCM_SET_CELL_OBJECT (ret, 3, scm_i_dynwinds ());
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SCM_SET_CELL_OBJECT (ret, 4, handler);
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SCM_SET_CELL_OBJECT (ret, 5, pre_unwind);
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return ret;
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}
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static void
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scm_init_control (void)
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{
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#ifndef SCM_MAGIC_SNARFER
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#include "libguile/control.x"
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#endif
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}
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void
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scm_register_control (void)
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{
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scm_c_register_extension ("libguile", "scm_init_control",
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(scm_t_extension_init_func)scm_init_control,
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NULL);
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}
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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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