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0a0ecc518b
* libguile/vm.h (struct scm_vm_cont): Include the tag word, and put flags there. Rename stack bottom to stack slice and make a flexible array. (scm_is_vm_cont): (scm_to_vm_cont): (scm_from_vm_cont): (scm_vm_cont_is_partial): (scm_vm_cont_is_rewindable): New build-time helpers. * libguile/continuations.c (scm_i_make_continuation): (scm_i_continuation_to_frame): (copy_stack_and_call): * libguile/continuations.h (scm_t_contregs): * libguile/frames.c (frame_stack_top): * libguile/stacks.c (scm_make_stack): Adapt to take struct scm_vm_cont* instead of SCM for continuations. * libguile/vm.c (capture_stack): Adapt to scm_vm_cont change. Use new gc_resolve_conservative_ref API to pin conservative refs from the captured stack. (scm_i_vm_cont_to_frame): (scm_i_capture_current_stack): (reinstate_continuation_x): (capture_continuation): (compose_continuation): (capture_delimited_continuation): (abort_to_prompt): Adapt to type changes.
99 lines
3.1 KiB
C
99 lines
3.1 KiB
C
#ifndef SCM_CONTINUATIONS_H
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#define SCM_CONTINUATIONS_H
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/* Copyright 1995-1996,2000-2001,2006,2008-2010,2012-2014,2018,2025
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Free Software Foundation, Inc.
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This file is part of Guile.
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Guile is free software: you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published
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by the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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Guile is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with Guile. If not, see
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<https://www.gnu.org/licenses/>. */
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#ifndef _WIN64
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#include <setjmp.h>
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#else
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#include "libguile/setjump-win.h"
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#endif
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#include "libguile/programs.h"
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#include "libguile/throw.h"
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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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struct scm_vm_cont;
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typedef struct
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{
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jmp_buf jmpbuf;
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#if SCM_HAVE_AUXILIARY_STACK
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void *auxiliary_stack;
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unsigned long auxiliary_stack_size;
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#endif
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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_cont *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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ptrdiff_t 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 (scm_thread *thread,
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struct scm_vm_cont *vm_cont);
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SCM_INTERNAL void scm_i_reinstate_continuation (SCM cont,
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uint8_t *mra) SCM_NORETURN;
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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 scm_t_contregs* scm_i_contregs (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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