Mon, 07 Jul 2014 10:12:40 +0200
8049421: G1 Class Unloading after completing a concurrent mark cycle
Reviewed-by: tschatzl, ehelin, brutisso, coleenp, roland, iveresov
Contributed-by: stefan.karlsson@oracle.com, mikael.gerdin@oracle.com
1 /*
2 * Copyright (c) 2012, 2014, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
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 */
25 #ifndef SHARE_VM_PRIMS_WHITEBOX_HPP
26 #define SHARE_VM_PRIMS_WHITEBOX_HPP
28 #include "prims/jni.h"
30 #include "memory/allocation.hpp"
31 #include "oops/oopsHierarchy.hpp"
33 // Entry macro to transition from JNI to VM state.
35 #define WB_ENTRY(result_type, header) JNI_ENTRY(result_type, header)
36 #define WB_END JNI_END
37 #define WB_METHOD_DECLARE(result_type) extern "C" result_type JNICALL
39 #define CHECK_JNI_EXCEPTION_(env, value) \
40 do { \
41 JavaThread* THREAD = JavaThread::thread_from_jni_environment(env); \
42 if (HAS_PENDING_EXCEPTION) { \
43 return(value); \
44 } \
45 } while (0)
47 #define CHECK_JNI_EXCEPTION(env) \
48 do { \
49 JavaThread* THREAD = JavaThread::thread_from_jni_environment(env); \
50 if (HAS_PENDING_EXCEPTION) { \
51 return; \
52 } \
53 } while (0)
55 class WhiteBox : public AllStatic {
56 private:
57 static bool _used;
58 public:
59 static bool used() { return _used; }
60 static void set_used() { _used = true; }
61 static int offset_for_field(const char* field_name, oop object,
62 Symbol* signature_symbol);
63 static const char* lookup_jstring(const char* field_name, oop object);
64 static bool lookup_bool(const char* field_name, oop object);
66 static int array_bytes_to_length(size_t bytes);
67 };
71 #endif // SHARE_VM_PRIMS_WHITEBOX_HPP