blob: 5e932afe8d05e791f98bb0583b08801cdc9ed770 [file] [log] [blame]
* Copyright 1988, 1989 Hans-J. Boehm, Alan J. Demers
* Copyright (c) 1991-1995 by Xerox Corporation. All rights reserved.
* Copyright 1996-1999 by Silicon Graphics. All rights reserved.
* Copyright 1999 by Hewlett-Packard Company. All rights reserved.
* Permission is hereby granted to use or copy this program
* for any purpose, provided the above notices are retained on all copies.
* Permission to modify the code and to distribute modified code is granted,
* provided the above notices are retained, and a notice that the code was
* modified is included with the above copyright notice.
/* This file assumes the collector has been compiled with GC_GCJ_SUPPORT */
/* and that an ANSI C compiler is available. */
* We allocate objects whose first word contains a pointer to a struct
* describing the object type. This struct contains a garbage collector mark
* descriptor at offset MARK_DESCR_OFFSET. Alternatively, the objects
* may be marked by the mark procedure passed to GC_init_gcj_malloc.
#ifndef GC_GCJ_H
#define GC_GCJ_H
# define MARK_DESCR_OFFSET sizeof(word)
/* Gcj keeps GC descriptor as second word of vtable. This */
/* probably needs to be adjusted for other clients. */
/* We currently assume that this offset is such that: */
/* - all objects of this kind are large enough to have */
/* a value at that offset, and */
/* - it is not zero. */
/* These assumptions allow objects on the free list to be */
/* marked normally. */
#ifndef _GC_H
# include "gc.h"
/* The following allocators signal an out of memory condition with */
/* return GC_oom_fn(bytes); */
/* The following function must be called before the gcj allocators */
/* can be invoked. */
/* mp_index and mp are the index and mark_proc (see gc_mark.h) */
/* respectively for the allocated objects. Mark_proc will be */
/* used to build the descriptor for objects allocated through the */
/* debugging interface. The mark_proc will be invoked on all such */
/* objects with an "environment" value of 1. The client may chose */
/* to use the same mark_proc for some of its generated mark descriptors.*/
/* In that case, it should use a different "environment" value to */
/* detect the presence or absence of the debug header. */
/* Mp is really of type mark_proc, as defined in gc_mark.h. We don't */
/* want to include that here for namespace pollution reasons. */
extern void GC_init_gcj_malloc(int mp_index, void * /* really mark_proc */mp);
/* Allocate an object, clear it, and store the pointer to the */
/* type structure (vtable in gcj). */
/* This adds a byte at the end of the object if GC_malloc would.*/
extern void * GC_gcj_malloc(size_t lb, void * ptr_to_struct_containing_descr);
/* The debug versions allocate such that the specified mark_proc */
/* is always invoked. */
extern void * GC_debug_gcj_malloc(size_t lb,
void * ptr_to_struct_containing_descr,
/* Similar to the above, but the size is in words, and we don't */
/* adjust it. The size is assumed to be such that it can be */
/* allocated as a small object. */
/* Unless it is known that the collector is not configured */
/* with USE_MARK_BYTES and unless it is known that the object */
/* has weak alignment requirements, lw must be even. */
extern void * GC_gcj_fast_malloc(size_t lw,
void * ptr_to_struct_containing_descr);
extern void * GC_debug_gcj_fast_malloc(size_t lw,
void * ptr_to_struct_containing_descr,
/* Similar to GC_gcj_malloc, but assumes that a pointer to near the */
/* beginning of the resulting object is always maintained. */
extern void * GC_gcj_malloc_ignore_off_page(size_t lb,
void * ptr_to_struct_containing_descr);
# ifdef GC_DEBUG
# define GC_GCJ_MALLOC(s,d) GC_debug_gcj_malloc(s,d,GC_EXTRAS)
# define GC_GCJ_FAST_MALLOC(s,d) GC_debug_gcj_fast_malloc(s,d,GC_EXTRAS)
# define GC_GCJ_MALLOC_IGNORE_OFF_PAGE(s,d) GC_debug_gcj_malloc(s,d,GC_EXTRAS)
# else
# define GC_GCJ_MALLOC(s,d) GC_gcj_malloc(s,d)
# define GC_GCJ_FAST_MALLOC(s,d) GC_gcj_fast_malloc(s,d)
# endif
#endif /* GC_GCJ_H */