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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 8c92982cbbc4
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/*
 * Copyright (c) 1997, 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_OPTO_OPCODES_HPP
#define SHARE_VM_OPTO_OPCODES_HPP

// Build a big enum of class names to give them dense integer indices
#define macro(x) Op_##x,
enum Opcodes {
  Op_Node = 0,
  macro(Set)                    // Instruction selection match rule
  macro(RegN)                   // Machine narrow oop register
  macro(RegI)                   // Machine integer register
  macro(RegP)                   // Machine pointer register
  macro(RegF)                   // Machine float   register
  macro(RegD)                   // Machine double  register
  macro(RegL)                   // Machine long    register
  macro(RegFlags)               // Machine flags   register
  _last_machine_leaf,           // Split between regular opcodes and machine
#include "classes.hpp"
  _last_opcode
};
#undef macro

// Table of names, indexed by Opcode
extern const char *NodeClassNames[];

#endif // SHARE_VM_OPTO_OPCODES_HPP