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9ede013f68
* libguile/dynstack.h: * libguile/dynstack.c: New files, implementing the dynamic stack as a true stack instead of a linked list. This lowers the cost of dynwinds: frames, winders, prompts, with-fluids, and dynamic-wind. For the most part, we allocate these items directly on the stack. * libguile/dynwinds.h: * libguile/dynwinds.c: Adapt all manipulators of the wind stack to use interfaces from dynstack.c. Remove heap-allocated winder and frame object types. (scm_dowinds, scm_i_dowinds): Remove these. The first was exported, but it was not a public interface. * libguile/continuations.c: * libguile/continuations.h (scm_t_contregs): Continuation objects reference scm_t_dynstack* values now. Adapt to the new interfaces. * libguile/control.c: * libguile/control.h: There is no longer a scm_tc7_prompt kind of object that can be allocated on the heap. Instead, the prompt flags, key, and registers are pushed on the dynwind stack. (The registers are still on the heap.) Also, since the vm_cont will reference the dynwinds, make the partial continuation stub take just one extra arg, instead of storing the intwinds separately in the object table. * libguile/fluids.c: * libguile/fluids.h: No more with-fluids objects; instead, the fluids go on the dynstack. The values still have to be on the heap, though. (scm_prepare_fluids, scm_swap_fluids): New internal functions, replacing scm_i_make_with_fluids and scm_i_swap_with_fluids. * libguile/print.c: Remove prompt and with-fluids printers. * libguile/tags.h: Revert prompt and with-fluids tc7 values to what they were before they were allocated. * libguile/vm-i-system.c (partial_cont_call): Just pop the vmcont, the intwinds will not be passed as a second arg. Rewind the dynamic stack from within the VM, so that any rewinder sees valid prompt entries. (call_cc, tail_call_cc): Adapt to pass the dynstack to scm_i_vm_capture_stack. (prompt, wind, unwind, wind_fluids, unwind_fluids): Adapt to the new interfaces. * libguile/vm.h (scm_i_capture_current_stack): Rename from scm_i_vm_capture_continuation. (scm_i_vm_capture_stack): Take a dynstack as an argument. * libguile/vm.c (vm_reinstate_partial_continuation): Don't wind here, as that could result in winders seeing invalid prompts. * libguile/eval.c: * libguile/root.c: * libguile/stacks.c: * libguile/threads.c: * libguile/threads.h: * libguile/throw.c: Adapt other users of dynwinds to use the dynstack.
102 lines
3.1 KiB
C
102 lines
3.1 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 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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SCM vm; /* 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, SCM vm, 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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SCM_INTERNAL SCM scm_i_call_with_current_continuation (SCM proc);
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SCM_INTERNAL SCM scm_i_continuation_to_frame (SCM cont);
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SCM_INTERNAL SCM scm_i_contregs_vm (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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