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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 f95d63e2154a
children
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/*
 * Copyright (c) 1997, 2011, 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 CPU_X86_VM_CPPINTERPRETERGENERATOR_X86_HPP
#define CPU_X86_VM_CPPINTERPRETERGENERATOR_X86_HPP

 protected:

#if 0
  address generate_asm_interpreter_entry(bool synchronized);
  address generate_native_entry(bool synchronized);
  address generate_abstract_entry(void);
  address generate_math_entry(AbstractInterpreter::MethodKind kind);
  address generate_empty_entry(void);
  address generate_accessor_entry(void);
  address generate_Reference_get_entry(void);
  void lock_method(void);
  void generate_stack_overflow_check(void);

  void generate_counter_incr(Label* overflow, Label* profile_method, Label* profile_method_continue);
  void generate_counter_overflow(Label* do_continue);
#endif

  void generate_more_monitors();
  void generate_deopt_handling();
  address generate_interpreter_frame_manager(bool synchronized); // C++ interpreter only
  void generate_compute_interpreter_state(const Register state,
                                          const Register prev_state,
                                          const Register sender_sp,
                                          bool native); // C++ interpreter only

#endif // CPU_X86_VM_CPPINTERPRETERGENERATOR_X86_HPP