Annotation of OpenXM_contrib2/asir2000/gc5.3/gc_typed.h, Revision 1.1.1.1
1.1 noro 1: /*
2: * Copyright 1988, 1989 Hans-J. Boehm, Alan J. Demers
3: * Copyright (c) 1991-1994 by Xerox Corporation. All rights reserved.
4: * Copyright 1996 Silicon Graphics. All rights reserved.
5: *
6: * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY EXPRESSED
7: * OR IMPLIED. ANY USE IS AT YOUR OWN RISK.
8: *
9: * Permission is hereby granted to use or copy this program
10: * for any purpose, provided the above notices are retained on all copies.
11: * Permission to modify the code and to distribute modified code is granted,
12: * provided the above notices are retained, and a notice that the code was
13: * modified is included with the above copyright notice.
14: */
15: /*
16: * Some simple primitives for allocation with explicit type information.
17: * Facilities for dynamic type inference may be added later.
18: * Should be used only for extremely performance critical applications,
19: * or if conservative collector leakage is otherwise a problem (unlikely).
20: * Note that this is implemented completely separately from the rest
21: * of the collector, and is not linked in unless referenced.
22: * This does not currently support GC_DEBUG in any interesting way.
23: */
24: /* Boehm, May 19, 1994 2:13 pm PDT */
25:
26: #ifndef _GC_TYPED_H
27: # define _GC_TYPED_H
28: # ifndef _GC_H
29: # include "gc.h"
30: # endif
31:
32: typedef GC_word * GC_bitmap;
33: /* The least significant bit of the first word is one if */
34: /* the first word in the object may be a pointer. */
35:
36: # define GC_get_bit(bm, index) \
37: (((bm)[divWORDSZ(index)] >> modWORDSZ(index)) & 1)
38: # define GC_set_bit(bm, index) \
39: (bm)[divWORDSZ(index)] |= (word)1 << modWORDSZ(index)
40:
41: typedef GC_word GC_descr;
42:
43: GC_API GC_descr GC_make_descriptor GC_PROTO((GC_bitmap bm, size_t len));
44: /* Return a type descriptor for the object whose layout */
45: /* is described by the argument. */
46: /* The least significant bit of the first word is one */
47: /* if the first word in the object may be a pointer. */
48: /* The second argument specifies the number of */
49: /* meaningful bits in the bitmap. The actual object */
50: /* may be larger (but not smaller). Any additional */
51: /* words in the object are assumed not to contain */
52: /* pointers. */
53: /* Returns a conservative approximation in the */
54: /* (unlikely) case of insufficient memory to build */
55: /* the descriptor. Calls to GC_make_descriptor */
56: /* may consume some amount of a finite resource. This */
57: /* is intended to be called once per type, not once */
58: /* per allocation. */
59:
60: GC_API GC_PTR GC_malloc_explicitly_typed
61: GC_PROTO((size_t size_in_bytes, GC_descr d));
62: /* Allocate an object whose layout is described by d. */
63: /* The resulting object MAY NOT BE PASSED TO REALLOC. */
64: /* The returned object is cleared. */
65:
66: GC_API GC_PTR GC_malloc_explicitly_typed_ignore_off_page
67: GC_PROTO((size_t size_in_bytes, GC_descr d));
68:
69: GC_API GC_PTR GC_calloc_explicitly_typed
70: GC_PROTO((size_t nelements,
71: size_t element_size_in_bytes,
72: GC_descr d));
73: /* Allocate an array of nelements elements, each of the */
74: /* given size, and with the given descriptor. */
75: /* The elemnt size must be a multiple of the byte */
76: /* alignment required for pointers. E.g. on a 32-bit */
77: /* machine with 16-bit aligned pointers, size_in_bytes */
78: /* must be a multiple of 2. */
79: /* Returned object is cleared. */
80:
81: #ifdef GC_DEBUG
82: # define GC_MALLOC_EXPLICTLY_TYPED(bytes, d) GC_MALLOC(bytes)
83: # define GC_CALLOC_EXPLICTLY_TYPED(n, bytes, d) GC_MALLOC(n*bytes)
84: #else
85: # define GC_MALLOC_EXPLICTLY_TYPED(bytes, d) \
86: GC_malloc_explicitly_typed(bytes, d)
87: # define GC_CALLOC_EXPLICTLY_TYPED(n, bytes, d) \
88: GC_calloc_explicitly_typed(n, bytes, d)
89: #endif /* !GC_DEBUG */
90:
91:
92: #endif /* _GC_TYPED_H */
93:
FreeBSD-CVSweb <freebsd-cvsweb@FreeBSD.org>