JDK14/Java14源码在线阅读

//
// Copyright (c) 2018, Red Hat, Inc. All rights reserved.
//
// 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.
//
//

source_hpp %{
#include "gc/shenandoah/shenandoahBarrierSetAssembler.hpp"
#include "gc/shenandoah/c2/shenandoahSupport.hpp"
%}

instruct compareAndSwapP_shenandoah(rRegI res,
                                    memory mem_ptr,
                                    eRegP tmp1, eRegP tmp2,
                                    eAXRegP oldval, eRegP newval,
                                    eFlagsReg cr)
%{
  match(Set res (ShenandoahCompareAndSwapP mem_ptr (Binary oldval newval)));
  match(Set res (ShenandoahWeakCompareAndSwapP mem_ptr (Binary oldval newval)));
  effect(TEMP tmp1, TEMP tmp2, KILL cr, KILL oldval);

  format %{ "shenandoah_cas_oop $mem_ptr,$newval" %}

  ins_encode %{
    ShenandoahBarrierSet::assembler()->cmpxchg_oop(&_masm,
                                                   $res$$Register, $mem_ptr$$Address, $oldval$$Register, $newval$$Register,
                                                   false, // swap
                                                   $tmp1$$Register, $tmp2$$Register
                                                   );
  %}
  ins_pipe( pipe_cmpxchg );
%}

instruct compareAndExchangeP_shenandoah(memory mem_ptr,
                                        eAXRegP oldval, eRegP newval,
                                        eRegP tmp1, eRegP tmp2,
                                        eFlagsReg cr)
%{
  match(Set oldval (ShenandoahCompareAndExchangeP mem_ptr (Binary oldval newval)));
  effect(KILL cr, TEMP tmp1, TEMP tmp2);
  ins_cost(1000);

  format %{ "shenandoah_cas_oop $mem_ptr,$newval" %}

  ins_encode %{
    ShenandoahBarrierSet::assembler()->cmpxchg_oop(&_masm,

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