JDK14/Java14源码在线阅读

/*
 * Copyright (c) 2018, 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.
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 */

#include "precompiled.hpp"
#include "gc/shared/c1/modRefBarrierSetC1.hpp"
#include "utilities/macros.hpp"

#ifdef ASSERT
#define __ gen->lir(__FILE__, __LINE__)->
#else
#define __ gen->lir()->
#endif

void ModRefBarrierSetC1::store_at_resolved(LIRAccess& access, LIR_Opr value) {
  DecoratorSet decorators = access.decorators();
  bool is_array = (decorators & IS_ARRAY) != 0;
  bool on_anonymous = (decorators & ON_UNKNOWN_OOP_REF) != 0;

  if (access.is_oop()) {
    pre_barrier(access, access.resolved_addr(),
                LIR_OprFact::illegalOpr /* pre_val */, access.patch_emit_info());
  }

  BarrierSetC1::store_at_resolved(access, value);

  if (access.is_oop()) {
    bool precise = is_array || on_anonymous;
    LIR_Opr post_addr = precise ? access.resolved_addr() : access.base().opr();
    post_barrier(access, post_addr, value);
  }
}

LIR_Opr ModRefBarrierSetC1::atomic_cmpxchg_at_resolved(LIRAccess& access, LIRItem& cmp_value, LIRItem& new_value) {
  if (access.is_oop()) {
    pre_barrier(access, access.resolved_addr(),
                LIR_OprFact::illegalOpr /* pre_val */, NULL);
  }

  LIR_Opr result = BarrierSetC1::atomic_cmpxchg_at_resolved(access, cmp_value, new_value);

  if (access.is_oop()) {
    post_barrier(access, access.resolved_addr(), new_value.result());
  }

  return result;
}

LIR_Opr ModRefBarrierSetC1::atomic_xchg_at_resolved(LIRAccess& access, LIRItem& value) {
  if (access.is_oop()) {
    pre_barrier(access, access.resolved_addr(),
                LIR_OprFact::illegalOpr /* pre_val */, NULL);
  }

  LIR_Opr result = BarrierSetC1::atomic_xchg_at_resolved(access, value);

  if (access.is_oop()) {
    post_barrier(access, access.resolved_addr(), value.result());
  }

  return result;
}

// This overrides the default to resolve the address into a register,
// assuming it will be used by a write barrier anyway.
LIR_Opr ModRefBarrierSetC1::resolve_address(LIRAccess& access, bool resolve_in_register) {
  DecoratorSet decorators = access.decorators();
  bool needs_patching = (decorators & C1_NEEDS_PATCHING) != 0;

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