* Updated header: Added 2006. Changed address of FSF. Changed email
[cacao.git] / src / vm / references.h
1 /* vm/references.h - references to classes/fields/methods
2
3    Copyright (C) 1996-2005, 2006 R. Grafl, A. Krall, C. Kruegel,
4    C. Oates, R. Obermaisser, M. Platter, M. Probst, S. Ring,
5    E. Steiner, C. Thalinger, D. Thuernbeck, P. Tomsich, C. Ullrich,
6    J. Wenninger, Institut f. Computersprachen - TU Wien
7
8    This file is part of CACAO.
9
10    This program is free software; you can redistribute it and/or
11    modify it under the terms of the GNU General Public License as
12    published by the Free Software Foundation; either version 2, or (at
13    your option) any later version.
14
15    This program is distributed in the hope that it will be useful, but
16    WITHOUT ANY WARRANTY; without even the implied warranty of
17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
18    General Public License for more details.
19
20    You should have received a copy of the GNU General Public License
21    along with this program; if not, write to the Free Software
22    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
23    02110-1301, USA.
24
25    Contact: cacao@cacaojvm.org
26
27    Authors: Edwin Steiner
28
29    Changes:
30
31    $Id: references.h 4357 2006-01-22 23:33:38Z twisti $
32
33 */
34
35 #ifndef _REFERENCES_H_
36 #define _REFERENCES_H_
37
38 #include "vm/global.h"
39 #include "vm/utf8.h"
40
41
42 /*----------------------------------------------------------------------------*/
43 /* References                                                                 */
44 /*                                                                            */
45 /* This header files defines the following types used for references to       */
46 /* classes/methods/fields and descriptors:                                    */
47 /*                                                                            */
48 /*     classinfo *                a loaded class                              */
49 /*     constant_classref          a symbolic reference                        */
50 /*     classref_or_classinfo      a loaded class or a symbolic reference      */
51 /*                                                                            */
52 /*     constant_FMIref            a symb. ref. to a field/method/intf.method  */
53 /*                                                                            */
54 /*     typedesc *                 describes a field type                      */
55 /*     methoddesc *               descrives a method type                     */
56 /*     parseddesc                 describes a field type or a method type     */
57 /*----------------------------------------------------------------------------*/
58
59 /* forward declarations *******************************************************/
60
61 typedef struct classinfo classinfo; 
62 typedef struct typedesc typedesc;
63 typedef struct methoddesc methoddesc;
64
65
66 /* structs ********************************************************************/
67
68 /* constant_classref **********************************************************/
69
70 typedef struct constant_classref {
71         void      *pseudo_vftbl;      /* for distinguishing it from classinfo     */
72         classinfo *referer;           /* class containing the reference           */
73         utf       *name;              /* name of the class refered to             */
74 } constant_classref;
75
76
77 /* classref_or_classinfo ******************************************************/
78
79 typedef union {
80         constant_classref *ref;       /* a symbolic class reference               */
81         classinfo         *cls;       /* an already loaded class                  */
82         void              *any;       /* used for general access (x != NULL,...)  */
83 } classref_or_classinfo;
84
85
86 /* parseddesc *****************************************************************/
87
88 typedef union parseddesc {
89         typedesc          *fd;        /* parsed field descriptor                  */
90         methoddesc        *md;        /* parsed method descriptor                 */
91         void              *any;       /* used for simple test against NULL        */
92 } parseddesc;
93
94
95 /* constant_FMIref ************************************************************/
96
97 typedef struct {            /* Fieldref, Methodref and InterfaceMethodref     */
98         constant_classref *classref;  /* class containing this field/meth./intfm. */
99         utf       *name;        /* field/method/interfacemethod name              */
100         utf       *descriptor;  /* field/method/intfmeth. type descriptor string  */
101         parseddesc parseddesc;  /* parsed descriptor                              */
102 } constant_FMIref;
103
104
105 /* macros *********************************************************************/
106
107 /* a value that never occurrs in classinfo.header.vftbl                       */
108 #define CLASSREF_PSEUDO_VFTBL ((void *) 1)
109
110 /* macro for testing if a classref_or_classinfo is a classref                 */
111 /* `reforinfo` is only evaluated once                                         */
112 #define IS_CLASSREF(reforinfo)  \
113         ((reforinfo).ref->pseudo_vftbl == CLASSREF_PSEUDO_VFTBL)
114
115 /* macro for casting a classref/classinfo * to a classref_or_classinfo        */
116 #define CLASSREF_OR_CLASSINFO(value) \
117         (*((classref_or_classinfo *)(&(value))))
118
119 /* initialize a constant_classref with referer `ref` and name `classname`     */
120
121 #define CLASSREF_INIT(c,ref,classname) \
122     do { \
123         (c).pseudo_vftbl = CLASSREF_PSEUDO_VFTBL; \
124         (c).referer = (ref); \
125         (c).name = (classname); \
126     } while (0)
127
128 #endif /* _REFERENCES_H_ */
129
130 /*
131  * These are local overrides for various environment variables in Emacs.
132  * Please do not remove this and leave it at the end of the file, where
133  * Emacs will automagically detect them.
134  * ---------------------------------------------------------------------
135  * Local variables:
136  * mode: c
137  * indent-tabs-mode: t
138  * c-basic-offset: 4
139  * tab-width: 4
140  * End:
141  * vim:noexpandtab:sw=4:ts=4:
142  */
143