5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 // The system dictionary stores all loaded classes and maps:
26 //
27 // [class name,class loader] -> class i.e. [symbolOop,oop] -> klassOop
28 //
29 // Classes are loaded lazily. The default VM class loader is
30 // represented as NULL.
31
32 // The underlying data structure is an open hash table with a fixed number
33 // of buckets. During loading the loader object is locked, (for the VM loader
34 // a private lock object is used). Class loading can thus be done concurrently,
35 // but only by different loaders.
36 //
37 // During loading a placeholder (name, loader) is temporarily placed in
38 // a side data structure, and is used to detect ClassCircularityErrors
39 // and to perform verification during GC. A GC can occur in the midst
40 // of class loading, as we call out to Java, have to take locks, etc.
41 //
42 // When class loading is finished, a new entry is added to the system
43 // dictionary and the place holder is removed. Note that the protection
44 // domain field of the system dictionary has not yet been filled in when
654 static oop _java_system_loader;
655
656 static bool _has_loadClassInternal;
657 static bool _has_checkPackageAccess;
658 };
659
660 // Cf. vmSymbols vs. vmSymbolHandles
661 class SystemDictionaryHandles : AllStatic {
662 public:
663 #define WK_KLASS_HANDLE_DECLARE(name, ignore_symbol, option) \
664 static KlassHandle name() { \
665 SystemDictionary::name(); \
666 klassOop* loc = &SystemDictionary::_well_known_klasses[SystemDictionary::WK_KLASS_ENUM_NAME(name)]; \
667 return KlassHandle(loc, true); \
668 }
669 WK_KLASSES_DO(WK_KLASS_HANDLE_DECLARE);
670 #undef WK_KLASS_HANDLE_DECLARE
671
672 static KlassHandle box_klass(BasicType t);
673 };
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5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #ifndef SHARE_VM_CLASSFILE_SYSTEMDICTIONARY_HPP
26 #define SHARE_VM_CLASSFILE_SYSTEMDICTIONARY_HPP
27
28 #include "classfile/classFileStream.hpp"
29 #include "classfile/classLoader.hpp"
30 #include "oops/objArrayOop.hpp"
31 #include "oops/symbolOop.hpp"
32 #include "runtime/java.hpp"
33 #include "runtime/reflectionUtils.hpp"
34 #include "utilities/hashtable.hpp"
35
36 // The system dictionary stores all loaded classes and maps:
37 //
38 // [class name,class loader] -> class i.e. [symbolOop,oop] -> klassOop
39 //
40 // Classes are loaded lazily. The default VM class loader is
41 // represented as NULL.
42
43 // The underlying data structure is an open hash table with a fixed number
44 // of buckets. During loading the loader object is locked, (for the VM loader
45 // a private lock object is used). Class loading can thus be done concurrently,
46 // but only by different loaders.
47 //
48 // During loading a placeholder (name, loader) is temporarily placed in
49 // a side data structure, and is used to detect ClassCircularityErrors
50 // and to perform verification during GC. A GC can occur in the midst
51 // of class loading, as we call out to Java, have to take locks, etc.
52 //
53 // When class loading is finished, a new entry is added to the system
54 // dictionary and the place holder is removed. Note that the protection
55 // domain field of the system dictionary has not yet been filled in when
665 static oop _java_system_loader;
666
667 static bool _has_loadClassInternal;
668 static bool _has_checkPackageAccess;
669 };
670
671 // Cf. vmSymbols vs. vmSymbolHandles
672 class SystemDictionaryHandles : AllStatic {
673 public:
674 #define WK_KLASS_HANDLE_DECLARE(name, ignore_symbol, option) \
675 static KlassHandle name() { \
676 SystemDictionary::name(); \
677 klassOop* loc = &SystemDictionary::_well_known_klasses[SystemDictionary::WK_KLASS_ENUM_NAME(name)]; \
678 return KlassHandle(loc, true); \
679 }
680 WK_KLASSES_DO(WK_KLASS_HANDLE_DECLARE);
681 #undef WK_KLASS_HANDLE_DECLARE
682
683 static KlassHandle box_klass(BasicType t);
684 };
685
686 #endif // SHARE_VM_CLASSFILE_SYSTEMDICTIONARY_HPP
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