Runtime1.java

/*
 * Copyright (c) 2000, 2020, 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.
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package sun.jvm.hotspot.c1;

import java.util.*;
import sun.jvm.hotspot.code.*;
import sun.jvm.hotspot.debugger.*;
import sun.jvm.hotspot.runtime.*;
import sun.jvm.hotspot.types.*;
import sun.jvm.hotspot.utilities.Observable;
import sun.jvm.hotspot.utilities.Observer;

/** Currently a minimal port to get C1 frame traversal working */

public class Runtime1 {
  private static Field         blobsField;

  static {
    VM.registerVMInitializedObserver(new Observer() {
        public void update(Observable o, Object data) {
          initialize(VM.getVM().getTypeDataBase());
        }
      });
  }

  private static synchronized void initialize(TypeDataBase db) {
    Type type = db.lookupType("Runtime1");

    blobsField = type.getField("_blobs");
  }

  public Runtime1() {
  }

  /** FIXME: consider making argument "type-safe" in Java port */
  public Address entryFor(int id) {
    return blobFor(id).codeBegin();
  }

  /** FIXME: consider making argument "type-safe" in Java port */
  public CodeBlob blobFor(int id) {
    Address blobAddr = blobsField.getStaticFieldAddress().getAddressAt(id * VM.getVM().getAddressSize());
    return VM.getVM().getCodeCache().createCodeBlobWrapper(blobAddr);
  }
}