JDK14/Java14源码在线阅读

/*
 * Copyright (c) 2001, 2017, 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.
 *
 */

package sun.jvm.hotspot.runtime;

import java.util.Observer;
import sun.jvm.hotspot.types.TypeDataBase;


/** Encapsulates the BasicTypeSize enum in globalDefinitions.hpp in
    the VM. */

public class BasicTypeSize {
  private static int tBooleanSize;
  private static int tCharSize;
  private static int tFloatSize;
  private static int tDoubleSize;
  private static int tByteSize;
  private static int tShortSize;
  private static int tIntSize;
  private static int tLongSize;
  private static int tObjectSize;
  private static int tArraySize;
  private static int tNarrowOopSize;
  private static int tNarrowKlassSize;
  private static int tVoidSize;

  static {
    VM.registerVMInitializedObserver(
        (o, d) -> initialize(VM.getVM().getTypeDataBase()));
  }

  private static synchronized void initialize(TypeDataBase db) {
    tBooleanSize     = db.lookupIntConstant("T_BOOLEAN_size").intValue();
    tCharSize        = db.lookupIntConstant("T_INT_size").intValue();
    tFloatSize       = db.lookupIntConstant("T_FLOAT_size").intValue();
    tDoubleSize      = db.lookupIntConstant("T_DOUBLE_size").intValue();
    tByteSize        = db.lookupIntConstant("T_BYTE_size").intValue();
    tShortSize       = db.lookupIntConstant("T_SHORT_size").intValue();
    tIntSize         = db.lookupIntConstant("T_INT_size").intValue();
    tLongSize        = db.lookupIntConstant("T_LONG_size").intValue();
    tObjectSize      = db.lookupIntConstant("T_OBJECT_size").intValue();
    tArraySize       = db.lookupIntConstant("T_ARRAY_size").intValue();
    tNarrowOopSize   = db.lookupIntConstant("T_NARROWOOP_size").intValue();
    tNarrowKlassSize = db.lookupIntConstant("T_NARROWKLASS_size").intValue();
    tVoidSize        = db.lookupIntConstant("T_VOID_size").intValue();
  }

  public static int getTBooleanSize() {
    return tBooleanSize;
  }

  public static int getTCharSize() {
    return tCharSize;
  }

  public static int getTFloatSize() {
    return tFloatSize;
  }

  public static int getTDoubleSize() {
    return tDoubleSize;
  }

  public static int getTByteSize() {
    return tByteSize;
  }

  public static int getTShortSize() {
    return tShortSize;
  }

  public static int getTIntSize() {
    return tIntSize;
  }

  public static int getTLongSize() {

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