1999-04-07 10:01:30 +02:00
|
|
|
/*
|
|
|
|
* Copyright 1988, 1989 Hans-J. Boehm, Alan J. Demers
|
|
|
|
* Copyright (c) 1991-1994 by Xerox Corporation. All rights reserved.
|
|
|
|
* Copyright 1996 Silicon Graphics. All rights reserved.
|
|
|
|
*
|
|
|
|
* THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
|
|
|
|
* OR IMPLIED. ANY USE IS AT YOUR OWN RISK.
|
|
|
|
*
|
|
|
|
* 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.
|
|
|
|
*/
|
|
|
|
/*
|
|
|
|
* Some simple primitives for allocation with explicit type information.
|
|
|
|
* Facilities for dynamic type inference may be added later.
|
|
|
|
* Should be used only for extremely performance critical applications,
|
|
|
|
* or if conservative collector leakage is otherwise a problem (unlikely).
|
|
|
|
* Note that this is implemented completely separately from the rest
|
|
|
|
* of the collector, and is not linked in unless referenced.
|
|
|
|
* This does not currently support GC_DEBUG in any interesting way.
|
|
|
|
*/
|
|
|
|
/* Boehm, May 19, 1994 2:13 pm PDT */
|
|
|
|
|
|
|
|
#ifndef _GC_TYPED_H
|
|
|
|
# define _GC_TYPED_H
|
|
|
|
# ifndef _GC_H
|
|
|
|
# include "gc.h"
|
|
|
|
# endif
|
|
|
|
|
|
|
|
typedef GC_word * GC_bitmap;
|
|
|
|
/* The least significant bit of the first word is one if */
|
|
|
|
/* the first word in the object may be a pointer. */
|
|
|
|
|
|
|
|
# define GC_get_bit(bm, index) \
|
|
|
|
(((bm)[divWORDSZ(index)] >> modWORDSZ(index)) & 1)
|
|
|
|
# define GC_set_bit(bm, index) \
|
|
|
|
(bm)[divWORDSZ(index)] |= (word)1 << modWORDSZ(index)
|
|
|
|
|
|
|
|
typedef GC_word GC_descr;
|
|
|
|
|
|
|
|
GC_API GC_descr GC_make_descriptor GC_PROTO((GC_bitmap bm, size_t len));
|
|
|
|
/* Return a type descriptor for the object whose layout */
|
|
|
|
/* is described by the argument. */
|
|
|
|
/* The least significant bit of the first word is one */
|
|
|
|
/* if the first word in the object may be a pointer. */
|
|
|
|
/* The second argument specifies the number of */
|
|
|
|
/* meaningful bits in the bitmap. The actual object */
|
|
|
|
/* may be larger (but not smaller). Any additional */
|
|
|
|
/* words in the object are assumed not to contain */
|
|
|
|
/* pointers. */
|
|
|
|
/* Returns a conservative approximation in the */
|
|
|
|
/* (unlikely) case of insufficient memory to build */
|
|
|
|
/* the descriptor. Calls to GC_make_descriptor */
|
|
|
|
/* may consume some amount of a finite resource. This */
|
|
|
|
/* is intended to be called once per type, not once */
|
|
|
|
/* per allocation. */
|
|
|
|
|
|
|
|
GC_API GC_PTR GC_malloc_explicitly_typed
|
|
|
|
GC_PROTO((size_t size_in_bytes, GC_descr d));
|
|
|
|
/* Allocate an object whose layout is described by d. */
|
|
|
|
/* The resulting object MAY NOT BE PASSED TO REALLOC. */
|
2000-04-19 04:29:16 +02:00
|
|
|
/* The returned object is cleared. */
|
1999-04-07 10:01:30 +02:00
|
|
|
|
|
|
|
GC_API GC_PTR GC_malloc_explicitly_typed_ignore_off_page
|
|
|
|
GC_PROTO((size_t size_in_bytes, GC_descr d));
|
|
|
|
|
|
|
|
GC_API GC_PTR GC_calloc_explicitly_typed
|
|
|
|
GC_PROTO((size_t nelements,
|
|
|
|
size_t element_size_in_bytes,
|
|
|
|
GC_descr d));
|
|
|
|
/* Allocate an array of nelements elements, each of the */
|
|
|
|
/* given size, and with the given descriptor. */
|
|
|
|
/* The elemnt size must be a multiple of the byte */
|
|
|
|
/* alignment required for pointers. E.g. on a 32-bit */
|
|
|
|
/* machine with 16-bit aligned pointers, size_in_bytes */
|
|
|
|
/* must be a multiple of 2. */
|
2000-04-19 04:29:16 +02:00
|
|
|
/* Returned object is cleared. */
|
1999-04-07 10:01:30 +02:00
|
|
|
|
|
|
|
#ifdef GC_DEBUG
|
|
|
|
# define GC_MALLOC_EXPLICTLY_TYPED(bytes, d) GC_MALLOC(bytes)
|
|
|
|
# define GC_CALLOC_EXPLICTLY_TYPED(n, bytes, d) GC_MALLOC(n*bytes)
|
|
|
|
#else
|
|
|
|
# define GC_MALLOC_EXPLICTLY_TYPED(bytes, d) \
|
|
|
|
GC_malloc_explicitly_typed(bytes, d)
|
|
|
|
# define GC_CALLOC_EXPLICTLY_TYPED(n, bytes, d) \
|
|
|
|
GC_calloc_explicitly_typed(n, bytes, d)
|
|
|
|
#endif /* !GC_DEBUG */
|
|
|
|
|
|
|
|
|
|
|
|
#endif /* _GC_TYPED_H */
|
|
|
|
|