Mercurial > hg > graal-compiler
annotate src/share/vm/prims/jvmtiUtil.hpp @ 3249:e1162778c1c8
7009266: G1: assert(obj->is_oop_or_null(true )) failed: Error
Summary: A referent object that is only weakly reachable at the start of concurrent marking but is re-attached to the strongly reachable object graph during marking may not be marked as live. This can cause the reference object to be processed prematurely and leave dangling pointers to the referent object. Implement a read barrier for the java.lang.ref.Reference::referent field by intrinsifying the Reference.get() method, and intercepting accesses though JNI, reflection, and Unsafe, so that when a non-null referent object is read it is also logged in an SATB buffer.
Reviewed-by: kvn, iveresov, never, tonyp, dholmes
| author | johnc |
|---|---|
| date | Thu, 07 Apr 2011 09:53:20 -0700 |
| parents | f95d63e2154a |
| children |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 1972 | 2 * Copyright (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved. |
| 0 | 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 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #ifndef SHARE_VM_PRIMS_JVMTIUTIL_HPP |
| 26 #define SHARE_VM_PRIMS_JVMTIUTIL_HPP | |
| 27 | |
| 28 #include "jvmtifiles/jvmti.h" | |
| 29 #include "memory/resourceArea.hpp" | |
| 30 #include "prims/jvmtiEventController.hpp" | |
| 31 | |
| 0 | 32 /////////////////////////////////////////////////////////////// |
| 33 // | |
| 34 // class JvmtiUtil | |
| 35 // | |
| 36 // class for miscellaneous jvmti utility static methods | |
| 37 // | |
| 38 | |
| 39 class JvmtiUtil : AllStatic { | |
| 40 | |
| 41 static ResourceArea* _single_threaded_resource_area; | |
| 42 | |
| 43 static const char* _error_names[]; | |
| 44 static const bool _event_threaded[]; | |
| 45 | |
| 46 public: | |
| 47 | |
| 48 static ResourceArea* single_threaded_resource_area(); | |
| 49 | |
| 50 static const char* error_name(int num) { return _error_names[num]; } // To Do: add range checking | |
| 51 | |
| 52 static const bool has_event_capability(jvmtiEvent event_type, const jvmtiCapabilities* capabilities_ptr); | |
| 53 | |
| 54 static const bool event_threaded(int num) { | |
| 55 if (num >= JVMTI_MIN_EVENT_TYPE_VAL && num <= JVMTI_MAX_EVENT_TYPE_VAL) { | |
| 56 return _event_threaded[num]; | |
| 57 } | |
| 58 if (num >= EXT_MIN_EVENT_TYPE_VAL && num <= EXT_MAX_EVENT_TYPE_VAL) { | |
| 59 return false; | |
| 60 } | |
| 61 ShouldNotReachHere(); | |
| 62 return false; | |
| 63 } | |
| 64 }; | |
| 65 | |
| 66 | |
| 67 /////////////////////////////////////////////////////////////// | |
| 68 // | |
| 69 // class SafeResourceMark | |
| 70 // | |
| 71 // ResourceMarks that work before threads exist | |
| 72 // | |
| 73 | |
| 74 class SafeResourceMark : public ResourceMark { | |
| 75 | |
| 76 ResourceArea* safe_resource_area() { | |
| 77 Thread* thread; | |
| 78 | |
| 79 if (Threads::number_of_threads() == 0) { | |
| 80 return JvmtiUtil::single_threaded_resource_area(); | |
| 81 } | |
| 82 thread = ThreadLocalStorage::thread(); | |
| 83 if (thread == NULL) { | |
| 84 return JvmtiUtil::single_threaded_resource_area(); | |
| 85 } | |
| 86 return thread->resource_area(); | |
| 87 } | |
| 88 | |
| 89 public: | |
| 90 | |
| 91 SafeResourceMark() : ResourceMark(safe_resource_area()) {} | |
| 92 | |
| 93 }; | |
| 1972 | 94 |
| 95 #endif // SHARE_VM_PRIMS_JVMTIUTIL_HPP |