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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 638119ce7cfd
children
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/*
 * Copyright (c) 2003, 2011, Oracle and/or its affiliates. All rights reserved.
 * Copyright 2007, 2008, 2009, 2010 Red Hat, Inc.
 * 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 CPU_ZERO_VM_STUBROUTINES_ZERO_HPP
#define CPU_ZERO_VM_STUBROUTINES_ZERO_HPP

  // This file holds the platform specific parts of the StubRoutines
  // definition. See stubRoutines.hpp for a description on how to
  // extend it.

 public:
  static address call_stub_return_pc() {
    return (address) -1;
  }

  static bool returns_to_call_stub(address return_pc) {
    return return_pc == call_stub_return_pc();
  }

  enum platform_dependent_constants {
    code_size1 = 0,      // The assembler will fail with a guarantee
    code_size2 = 0       // if these are too small.  Simply increase
  };                     // them if that happens.

  enum method_handles_platform_dependent_constants {
    method_handles_adapters_code_size = 0
  };

#endif // CPU_ZERO_VM_STUBROUTINES_ZERO_HPP