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8052172: Evacuation failure handling in G1 does not evacuate all objects if -XX:-G1DeferredRSUpdate is set Summary: Remove -XX:-G1DeferredRSUpdate functionality as it is racy. During evacuation failure handling, threads where evacuation failure handling occurred may try to add remembered sets to regions which remembered sets are currently being scanned. The iterator to handle the remembered set scan does not support addition of entries during scan and so may skip valid references. Reviewed-by: iveresov, brutisso, mgerdin
author tschatzl
date Tue, 30 Sep 2014 09:44:36 +0200
parents f08d439fab8c
children
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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 CPU_X86_VM_BYTES_X86_HPP
#define CPU_X86_VM_BYTES_X86_HPP

#include "memory/allocation.hpp"

class Bytes: AllStatic {
 private:
#ifndef AMD64
  // Helper function for swap_u8
  static inline u8   swap_u8_base(u4 x, u4 y);        // compiler-dependent implementation
#endif // AMD64

 public:
  // Returns true if the byte ordering used by Java is different from the native byte ordering
  // of the underlying machine. For example, this is true for Intel x86, but false for Solaris
  // on Sparc.
  static inline bool is_Java_byte_ordering_different(){ return true; }


  // Efficient reading and writing of unaligned unsigned data in platform-specific byte ordering
  // (no special code is needed since x86 CPUs can access unaligned data)
  static inline u2   get_native_u2(address p)         { return *(u2*)p; }
  static inline u4   get_native_u4(address p)         { return *(u4*)p; }
  static inline u8   get_native_u8(address p)         { return *(u8*)p; }

  static inline void put_native_u2(address p, u2 x)   { *(u2*)p = x; }
  static inline void put_native_u4(address p, u4 x)   { *(u4*)p = x; }
  static inline void put_native_u8(address p, u8 x)   { *(u8*)p = x; }


  // Efficient reading and writing of unaligned unsigned data in Java
  // byte ordering (i.e. big-endian ordering). Byte-order reversal is
  // needed since x86 CPUs use little-endian format.
  static inline u2   get_Java_u2(address p)           { return swap_u2(get_native_u2(p)); }
  static inline u4   get_Java_u4(address p)           { return swap_u4(get_native_u4(p)); }
  static inline u8   get_Java_u8(address p)           { return swap_u8(get_native_u8(p)); }

  static inline void put_Java_u2(address p, u2 x)     { put_native_u2(p, swap_u2(x)); }
  static inline void put_Java_u4(address p, u4 x)     { put_native_u4(p, swap_u4(x)); }
  static inline void put_Java_u8(address p, u8 x)     { put_native_u8(p, swap_u8(x)); }


  // Efficient swapping of byte ordering
  static inline u2   swap_u2(u2 x);                   // compiler-dependent implementation
  static inline u4   swap_u4(u4 x);                   // compiler-dependent implementation
  static inline u8   swap_u8(u8 x);
};


// The following header contains the implementations of swap_u2, swap_u4, and swap_u8[_base]
#ifdef TARGET_OS_ARCH_linux_x86
# include "bytes_linux_x86.inline.hpp"
#endif
#ifdef TARGET_OS_ARCH_solaris_x86
# include "bytes_solaris_x86.inline.hpp"
#endif
#ifdef TARGET_OS_ARCH_windows_x86
# include "bytes_windows_x86.inline.hpp"
#endif
#ifdef TARGET_OS_ARCH_bsd_x86
# include "bytes_bsd_x86.inline.hpp"
#endif


#endif // CPU_X86_VM_BYTES_X86_HPP