view src/share/vm/prims/jvmtiExtensions.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 8b46b0196eb0
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/*
 * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 *
 */

#ifndef SHARE_VM_PRIMS_JVMTIEXTENSIONS_HPP
#define SHARE_VM_PRIMS_JVMTIEXTENSIONS_HPP

#ifndef JVMTI_KERNEL
#include "jvmtifiles/jvmti.h"
#include "jvmtifiles/jvmtiEnv.hpp"
#include "memory/allocation.hpp"
#endif

// JvmtiExtensions
//
// Maintains the list of extension functions and events in this JVMTI
// implementation. The list of functions and events can be obtained by
// the profiler using the JVMTI GetExtensionFunctions and
// GetExtensionEvents functions.

class JvmtiExtensions : public AllStatic {
 private:
  static GrowableArray<jvmtiExtensionFunctionInfo*>* _ext_functions;
  static GrowableArray<jvmtiExtensionEventInfo*>* _ext_events;

 public:
  // register extensions function
  static void register_extensions();

  // returns the list of extension functions
  static jvmtiError get_functions(JvmtiEnv* env, jint* extension_count_ptr,
                                  jvmtiExtensionFunctionInfo** extensions);

  // returns the list of extension events
  static jvmtiError get_events(JvmtiEnv* env, jint* extension_count_ptr,
                               jvmtiExtensionEventInfo** extensions);

  // sets the callback function for an extension event and enables the event
  static jvmtiError set_event_callback(JvmtiEnv* env, jint extension_event_index,
                                       jvmtiExtensionEvent callback);
};

#endif // SHARE_VM_PRIMS_JVMTIEXTENSIONS_HPP