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3b14dd2f27
* libguile/continuations.h: * libguile/continuations.c (scm_i_continuation_to_frame): Operate on low-level C structures instead of heap objects. * libguile/frames.h: * libguile/frames.c (frame_offset, frame_stack_base): Const args. (scm_c_frame_closure): New helper. (scm_frame_procedure): Use the new helper. * libguile/stacks.c (stack_depth, narrow_stack, scm_make_stack): Rework to avoid allocating frames as we traverse the stack, and to avoid an n**2 case where there are outer cuts.
105 lines
3.3 KiB
C
105 lines
3.3 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, 2006, 2008, 2009, 2010, 2012, 2013, 2014 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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#include "libguile/__scm.h"
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#ifdef __ia64__
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#include <signal.h>
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#include <ucontext.h>
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#endif /* __ia64__ */
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#define SCM_CONTINUATIONP(x) \
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(SCM_PROGRAM_P (x) && SCM_PROGRAM_IS_CONTINUATION (x))
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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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typedef struct
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{
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scm_i_jmp_buf jmpbuf;
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#ifdef __ia64__
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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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size_t num_stack_items; /* size of the saved stack. */
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SCM root; /* continuation root identifier. */
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struct scm_vm *vp; /* vm */
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SCM vm_cont; /* vm's stack and regs */
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/* The offset from the live stack location to this copy. This is
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used to adjust pointers from within the copied stack to the stack
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itself.
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Thus, when you read a pointer from the copied stack that points
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into the live stack, you need to add OFFSET so that it points
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into the copy.
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*/
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scm_t_ptrdiff offset;
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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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SCM_INTERNAL SCM scm_i_make_continuation (int *first,
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struct scm_vm *vp,
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SCM vm_cont);
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SCM_INTERNAL void scm_i_check_continuation (SCM cont);
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SCM_INTERNAL void scm_i_reinstate_continuation (SCM cont);
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struct scm_frame;
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SCM_INTERNAL int scm_i_continuation_to_frame (SCM cont,
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struct scm_frame *frame);
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SCM_INTERNAL struct scm_vm* scm_i_contregs_vp (SCM contregs);
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SCM_INTERNAL SCM scm_i_contregs_vm_cont (SCM contregs);
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SCM_API void *scm_c_with_continuation_barrier (void *(*func)(void*), void *);
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SCM_API SCM scm_with_continuation_barrier (SCM proc);
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SCM_INTERNAL SCM
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scm_i_with_continuation_barrier (scm_t_catch_body body,
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void *body_data,
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scm_t_catch_handler handler,
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void *handler_data,
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scm_t_catch_handler pre_unwind_handler,
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void *pre_unwind_handler_data);
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SCM_INTERNAL 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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