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/* Copyright (C) 2001, 2009, 2010, 2011, 2012, 2013, 2014, 2015 Free Software Foundation, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 3 of
* the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301 USA
*/
#ifndef _SCM_VM_H_
#define _SCM_VM_H_
#include <libguile.h>
#include <libguile/programs.h>
enum {
SCM_VM_APPLY_HOOK,
SCM_VM_PUSH_CONTINUATION_HOOK,
SCM_VM_POP_CONTINUATION_HOOK,
SCM_VM_NEXT_HOOK,
SCM_VM_ABORT_CONTINUATION_HOOK,
SCM_VM_NUM_HOOKS,
};
#define SCM_VM_REGULAR_ENGINE 0
#define SCM_VM_DEBUG_ENGINE 1
#define SCM_VM_NUM_ENGINES 2
struct scm_vm {
scm_t_uint32 *ip; /* instruction pointer */
union scm_vm_stack_element *sp; /* stack pointer */
union scm_vm_stack_element *fp; /* frame pointer */
union scm_vm_stack_element *stack_limit; /* stack limit address */
int trace_level; /* traces enabled if trace_level > 0 */
union scm_vm_stack_element *sp_min_since_gc; /* deepest sp since last gc */
size_t stack_size; /* stack size */
union scm_vm_stack_element *stack_bottom; /* lowest address in allocated stack */
union scm_vm_stack_element *stack_top; /* highest address in allocated stack */
SCM overflow_handler_stack; /* alist of max-stack-size -> thunk */
SCM hooks[SCM_VM_NUM_HOOKS]; /* hooks */
const void *resumable_prompt_cookie; /* opaque cookie */
int engine; /* which vm engine we're using */
};
SCM_INTERNAL struct scm_vm *scm_the_vm (void);
SCM_API SCM scm_call_with_vm (SCM proc, SCM args);
SCM_API SCM scm_call_with_stack_overflow_handler (SCM limit, SCM thunk,
SCM handler);
SCM_API SCM scm_vm_apply_hook (void);
SCM_API SCM scm_vm_push_continuation_hook (void);
SCM_API SCM scm_vm_pop_continuation_hook (void);
SCM_API SCM scm_vm_abort_continuation_hook (void);
SCM_API SCM scm_vm_next_hook (void);
SCM_API SCM scm_vm_trace_level (void);
SCM_API SCM scm_set_vm_trace_level_x (SCM level);
SCM_API SCM scm_vm_engine (void);
SCM_API SCM scm_set_vm_engine_x (SCM engine);
SCM_API SCM scm_set_default_vm_engine_x (SCM engine);
SCM_API void scm_c_set_vm_engine_x (int engine);
SCM_API void scm_c_set_default_vm_engine_x (int engine);
struct GC_ms_entry;
SCM_INTERNAL struct GC_ms_entry * scm_i_vm_mark_stack (struct scm_vm *,
struct GC_ms_entry *,
struct GC_ms_entry *);
SCM_INTERNAL void scm_i_vm_free_stack (struct scm_vm *vp);
#define SCM_F_VM_CONT_PARTIAL 0x1
#define SCM_F_VM_CONT_REWINDABLE 0x2
struct scm_vm_cont {
/* IP of newest frame. */
scm_t_uint32 *ra;
/* Offset of FP of newest frame, relative to stack top. */
scm_t_ptrdiff fp_offset;
/* Besides being the stack size, this is also the offset of the SP of
the newest frame. */
scm_t_ptrdiff stack_size;
/* Stack bottom, which also keeps saved stack alive for GC. */
union scm_vm_stack_element *stack_bottom;
/* Saved dynamic stack, with prompts relocated to record saved SP/FP
offsets from the stack top of this scm_vm_cont. */
scm_t_dynstack *dynstack;
/* See the continuation is partial and/or rewindable. */
scm_t_uint32 flags;
};
#define SCM_VM_CONT_P(OBJ) (SCM_HAS_TYP7 (OBJ, scm_tc7_vm_cont))
#define SCM_VM_CONT_DATA(CONT) ((struct scm_vm_cont *) SCM_CELL_WORD_1 (CONT))
#define SCM_VM_CONT_PARTIAL_P(CONT) (SCM_VM_CONT_DATA (CONT)->flags & SCM_F_VM_CONT_PARTIAL)
#define SCM_VM_CONT_REWINDABLE_P(CONT) (SCM_VM_CONT_DATA (CONT)->flags & SCM_F_VM_CONT_REWINDABLE)
SCM_API SCM scm_load_compiled_with_vm (SCM file);
SCM_INTERNAL SCM scm_i_call_with_current_continuation (SCM proc);
SCM_INTERNAL SCM scm_i_capture_current_stack (void);
SCM_INTERNAL SCM scm_i_vm_capture_stack (union scm_vm_stack_element *stack_top,
union scm_vm_stack_element *fp,
union scm_vm_stack_element *sp,
scm_t_uint32 *ra,
scm_t_dynstack *dynstack,
scm_t_uint32 flags);
SCM_INTERNAL int scm_i_vm_cont_to_frame (SCM cont, struct scm_frame *frame);
SCM_INTERNAL void scm_i_vm_cont_print (SCM x, SCM port,
scm_print_state *pstate);
SCM_INTERNAL int scm_i_vm_is_boot_continuation_code (scm_t_uint32 *ip);
SCM_INTERNAL void scm_bootstrap_vm (void);
SCM_INTERNAL void scm_init_vm (void);
#endif /* _SCM_VM_H_ */
/*
Local Variables:
c-file-style: "gnu"
End:
*/
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