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* libguile/continuations.c (scm_i_continuation_to_frame): Adapt to vra field renaming. (scm_i_reinstate_continuation, grow_stack, copy_stack_and_call) (scm_dynthrow): Take mra of continuation. Set on the vp before the longjmp. * libguile/continuations.h: Update scm_i_reinstate_continuation prototype. * libguile/dynstack.h: * libguile/control.c (scm_suspendable_continuation_p): * libguile/dynstack.c (PROMPT_WORDS, PROMPT_VRA, PROMPT_MRA): (PROMPT_JMPBUF, scm_dynstack_push_prompt, scm_dynstack_find_prompt) (scm_dynstack_wind_prompt): Store both virtual and machine return addresses on the dynstack, for prompts. * libguile/eval.c (eval): Pass NULL for mra. * libguile/intrinsics.c (push_prompt): Add mra arg, and pass it to the dynstack. * libguile/intrinsics.h: Update prototypes so that continuation-related intrinsics can save and restore the MRA. * libguile/jit.h: * libguile/jit.c: Return VRA when JIT code needs to tier down. * libguile/stacks.c (find_prompt, scm_make_stack) * libguile/throw.c (catch): Adapt find-prompt calls. * libguile/vm-engine.c (instrument-entry, instrument-loop): Add logic to continue with vcode after the mcode finishes. (compose-continuation, capture-continuation, abort, prompt): Add logic to pass NULL as captured MRA, but continue with mcode from new continuations, if appropriate. * libguile/vm.c (scm_i_vm_cont_to_frame, capture_stack) (scm_i_capture_current_stack, reinstate_continuation_x) (capture_continuation, compose_continuation_inner, compose_continuation) (capture_delimited_continuation, abort_to_prompt): Adapt to plumb around machine code continuations. (scm_call_n): Check "mra_after_abort" field for machine code continuation, if any. * libguile/vm.h (struct scm_vm): Add "mra_after_abort" field. (struct scm_vm_cont): Rename "ra" field to "vra" and add "mra" field.
92 lines
2.9 KiB
C
92 lines
2.9 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
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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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#include <setjmp.h>
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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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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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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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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, SCM 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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