/* Copyright (C) 1993, 1994, 1999 Aladdin Enterprises.  All rights reserved.
  
  This file is part of GNU Ghostscript.
  
  GNU Ghostscript is distributed in the hope that it will be useful, but
  WITHOUT ANY WARRANTY.  No author or distributor accepts responsibility
  to anyone for the consequences of using it or for whether it serves any
  particular purpose or works at all, unless he says so in writing.  Refer
  to the GNU General Public License for full details.
  
  Everyone is granted permission to copy, modify and redistribute GNU
  Ghostscript, but only under the conditions described in the GNU General
  Public License.  A copy of this license is supposed to have been given
  to you along with GNU Ghostscript so you can know your rights and
  responsibilities.  It should be in a file named COPYING.  Among other
  things, the copyright notice and this notice must be preserved on all
  copies.
*/

/*$RCSfile: imemory.h,v $ $Revision: 1.2.2.1 $ */
/* Ghostscript memory allocator extensions for interpreter level */

#ifndef imemory_INCLUDED
#  define imemory_INCLUDED

#include "ivmspace.h"

/*
 * The interpreter level of Ghostscript defines a "subclass" extension
 * of the allocator interface in gsmemory.h, by adding the ability to
 * allocate and free arrays of refs, and by adding the distinction
 * between local, global, and system allocation.
 */

#include "gsalloc.h"

#ifndef gs_ref_memory_DEFINED
#  define gs_ref_memory_DEFINED
typedef struct gs_ref_memory_s gs_ref_memory_t;
#endif

	/* Allocate a ref array. */

int gs_alloc_ref_array(P5(gs_ref_memory_t * mem, ref * paref,
			  uint attrs, uint num_refs, client_name_t cname));

	/* Resize a ref array. */
	/* Currently this is only implemented for shrinking, */
	/* not growing. */

int gs_resize_ref_array(P4(gs_ref_memory_t * mem, ref * paref,
			   uint new_num_refs, client_name_t cname));

	/* Free a ref array. */

void gs_free_ref_array(P3(gs_ref_memory_t * mem, ref * paref,
			  client_name_t cname));

	/* Allocate a string ref. */

int gs_alloc_string_ref(P5(gs_ref_memory_t * mem, ref * psref,
			   uint attrs, uint nbytes, client_name_t cname));

/* Register a ref root.  This just calls gs_register_root. */
/* Note that ref roots are a little peculiar: they assume that */
/* the ref * that they point to points to a *statically* allocated ref. */
int gs_register_ref_root(P4(gs_memory_t *mem, gs_gc_root_t *root,
			    void **pp, client_name_t cname));


/*
 * The interpreter allocator can allocate in either local or global VM,
 * and can switch between the two dynamically.  In Level 1 configurations,
 * global VM is the same as local; however, this is *not* currently true in
 * a Level 2 system running in Level 1 mode.  In addition, there is a third
 * VM space, system VM, that exists in both modes and is used for objects
 * that must not be affected by even the outermost save/restore (stack
 * segments and names).
 *
 * NOTE: since the interpreter's (only) instances of gs_dual_memory_t are
 * embedded in-line in context state structures, pointers to these
 * instances must not be stored anywhere that might persist across a
 * garbage collection.
 */
#ifndef gs_dual_memory_DEFINED
#  define gs_dual_memory_DEFINED
typedef struct gs_dual_memory_s gs_dual_memory_t;
#endif
struct gs_dual_memory_s {
    gs_ref_memory_t *current;	/* = ...global or ...local */
    vm_spaces spaces;		/* system, global, local */
    uint current_space;		/* = current->space */
    /* Garbage collection hook */
    int (*reclaim) (P2(gs_dual_memory_t *, int));
    /* Masks for store checking, see isave.h. */
    uint test_mask;
    uint new_mask;
};

#define public_st_gs_dual_memory()	/* in ialloc.c */\
  gs_public_st_simple(st_gs_dual_memory, gs_dual_memory_t, "gs_dual_memory_t")
#define st_gs_dual_memory_num_ptrs 0

#endif /* imemory_INCLUDED */
