1 /* src/native/llni.h - low level native interfarce (LLNI)
3 Copyright (C) 2007 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
8 This file is part of CACAO.
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.
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.
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
33 #include "native/localref.h"
35 #if defined(ENABLE_THREADS)
36 # include "threads/native/threads.h"
38 # include "threads/none/threads.h"
42 /* LLNI macros *****************************************************************
44 The following macros should be used whenever a Java Object is
45 accessed in native code without the use of an JNI function.
47 LLNI_field_set_val, LLNI_field_get_val:
48 Deal with primitive values like integer and float values. Do
49 not use these macros to access pointers or references!
51 LLNI_field_set_ref, LLNI_field_get_ref:
52 Deal with references to other objects.
54 LLNI_field_set_cls, LLNI_field_get_cls:
55 Deal with references to Java Classes which are internally
56 represented by classinfo or java_lang_Class.
58 *******************************************************************************/
60 #define LLNI_field_set_val(obj, field, value) \
61 LLNI_field_direct(obj, field) = (value)
63 #define LLNI_field_set_ref(obj, field, reference) \
64 LLNI_field_direct(obj, field) = LLNI_UNWRAP(reference)
66 #define LLNI_field_set_cls(obj, field, value) \
67 LLNI_field_direct(obj, field) = (java_lang_Class *) (value)
69 #define LLNI_field_get_val(obj, field, variable) \
70 (variable) = LLNI_field_direct(obj, field)
72 #define LLNI_field_get_ref(obj, field, variable) \
73 (variable) = LLNI_WRAP(LLNI_field_direct(obj, field))
75 #define LLNI_field_get_cls(obj, field, variable) \
76 (variable) = (classinfo *) LLNI_field_direct(obj, field)
78 #define LLNI_class_get(obj, variable) \
79 (variable) = LLNI_field_direct((java_handle_t *) obj, vftbl->class)
82 /* LLNI_equals ****************************************************************
84 Test if two java_handle_t* point to the same java_object_t*.
86 ******************************************************************************/
88 #define LLNI_equals(obj1, obj2, result) \
89 LLNI_CRITICAL_START; \
90 (result) = LLNI_UNWRAP(obj1) == LLNI_UNWRAP(obj2); \
94 /* LLNI_classinfo_field_get ***************************************************
96 Get a field from classinfo that is a java object.
98 ******************************************************************************/
100 #define LLNI_classinfo_field_get(cls, field, variable) \
101 LLNI_CRITICAL_START; \
102 (variable) = LLNI_WRAP((cls)->field); \
106 /* LLNI_classinfo_field_set ***************************************************
108 Set a field from classinfo that is a java object.
110 ******************************************************************************/
112 #define LLNI_classinfo_field_set(cls, field, variable) \
113 LLNI_CRITICAL_START; \
114 (cls)->field = LLNI_UNWRAP(variable); \
118 /* LLNI classinfo wrapping / unwrapping macros *********************************
120 The following macros are used to wrap or unwrap a classinfo from
121 or into a handle (typically java_lang_Class). No critical sections
122 are needed here, because classinfos are not placed on the GC heap.
124 XXX This might change once we implement Class Unloading!
126 *******************************************************************************/
128 #define LLNI_classinfo_wrap(classinfo) \
129 ((java_lang_Class *) LLNI_WRAP(classinfo))
131 #define LLNI_classinfo_unwrap(clazz) \
132 ((classinfo *) LLNI_UNWRAP((java_handle_t *) (clazz)))
135 /* XXX the direct macros have to be used inside a critical section!!! */
137 #define LLNI_field_direct(obj, field) (LLNI_DIRECT(obj)->field)
138 #define LLNI_vftbl_direct(obj) (LLNI_DIRECT((java_handle_t *) (obj))->vftbl)
139 #define LLNI_array_direct(arr, index) (LLNI_DIRECT(arr)->data[(index)])
140 #define LLNI_array_data(arr) (LLNI_DIRECT(arr)->data)
141 #define LLNI_array_size(arr) (LLNI_DIRECT((java_handle_objectarray_t *) (arr))->header.size)
144 /* LLNI wrapping / unwrapping macros *******************************************
146 ATTENTION: Only use these macros inside a LLNI critical section!
147 Once the ciritical section ends, all pointers onto the GC heap
148 retrieved through these macros are void!
150 *******************************************************************************/
152 #if defined(ENABLE_HANDLES)
153 # define LLNI_WRAP(obj) ((obj) == NULL ? NULL : localref_add(obj))
154 # define LLNI_UNWRAP(hdl) ((hdl) == NULL ? NULL : (hdl)->heap_object)
155 # define LLNI_QUICKWRAP(obj) ((obj) == NULL ? NULL : &(obj))
156 # define LLNI_DIRECT(hdl) ((hdl)->heap_object)
158 # define LLNI_WRAP(obj) (obj)
159 # define LLNI_UNWRAP(hdl) (hdl)
160 # define LLNI_QUICKWRAP(obj) (obj)
161 # define LLNI_DIRECT(hdl) (hdl)
165 /* LLNI critical sections ******************************************************
167 These macros handle the LLNI critical sections. While a critical
168 section is active, the absolute position of objects on the GC heap
169 is not allowed to change (no moving Garbage Collection).
171 ATTENTION: Use a critical section whenever you have a direct
172 pointer onto the GC heap!
174 *******************************************************************************/
176 #if defined(ENABLE_THREADS) && defined(ENABLE_GC_CACAO)
177 # define LLNI_CRITICAL_START llni_critical_start()
178 # define LLNI_CRITICAL_END llni_critical_end()
179 # define LLNI_CRITICAL_START_THREAD(t) llni_critical_start_thread(t)
180 # define LLNI_CRITICAL_END_THREAD(t) llni_critical_end_thread(t)
182 # define LLNI_CRITICAL_START
183 # define LLNI_CRITICAL_END
184 # define LLNI_CRITICAL_START_THREAD(t)
185 # define LLNI_CRITICAL_END_THREAD(t)
188 void llni_critical_start();
189 void llni_critical_end();
190 void llni_critical_start_thread(threadobject *t);
191 void llni_critical_end_thread(threadobject *t);
198 * These are local overrides for various environment variables in Emacs.
199 * Please do not remove this and leave it at the end of the file, where
200 * Emacs will automagically detect them.
201 * ---------------------------------------------------------------------
204 * indent-tabs-mode: t