agent/src/share/classes/sun/jvm/hotspot/debugger/cdbg/basic/BasicCompoundType.java

/*
 * Copyright (c) 2001, 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.debugger.cdbg.basic;

import java.util.*;
import sun.jvm.hotspot.debugger.*;
import sun.jvm.hotspot.debugger.cdbg.*;
import sun.jvm.hotspot.utilities.Assert;

public class BasicCompoundType extends BasicType implements CompoundType {
  private CompoundTypeKind kind;
  private List baseClasses;
  private List fields;

  public BasicCompoundType(String name, int size, CompoundTypeKind kind) {
    this(name, size, kind, 0);
  }

  private BasicCompoundType(String name, int size, CompoundTypeKind kind, int cvAttributes) {
    super(name, size, cvAttributes);
    if (Assert.ASSERTS_ENABLED) {
      Assert.that(kind != null, "null kind");
    }
    this.kind = kind;
  }

  public CompoundType asCompound() { return this; }

  public int       getNumBaseClasses() {
    return ((baseClasses == null) ? 0 : baseClasses.size());
  }
  public BaseClass getBaseClass(int i) {
    return (BaseClass) baseClasses.get(i);
  }

  public void addBaseClass(BaseClass b) {
    if (baseClasses == null) {
      baseClasses = new ArrayList();
    }
    baseClasses.add(b);
  }

  public int   getNumFields() {
    return ((fields == null) ? 0 : fields.size());
  }
  public Field getField(int i) {
    return (Field) fields.get(i);
  }

  public void addField(Field f) {
    if (fields == null) {
      fields = new ArrayList();
    }
    fields.add(f);
  }

  public boolean isClass()  { return (kind == CompoundTypeKind.CLASS); }
  public boolean isStruct() { return (kind == CompoundTypeKind.STRUCT); }
  public boolean isUnion()  { return (kind == CompoundTypeKind.UNION); }

  Type resolveTypes(BasicCDebugInfoDataBase db, ResolveListener listener) {
    super.resolveTypes(db, listener);
    if (baseClasses != null) {
      for (Iterator iter = baseClasses.iterator(); iter.hasNext(); ) {
        BasicBaseClass b = (BasicBaseClass) iter.next();
        b.resolveTypes(this, db, listener);
      }
    }
    if (fields != null) {
      for (Iterator iter = fields.iterator(); iter.hasNext(); ) {
        BasicField b = (BasicField) iter.next();
        b.resolveTypes(this, db, listener);
      }
    }
    return this;
  }

  public void iterateObject(Address a, ObjectVisitor v, FieldIdentifier f) {
    // What kind of iteration are we doing? If the end user requested
    // iteration over a given object at a given address, the field
    // identifier will be null, and we should descend and iterate over
    // our fields and superclasses. Otherwise, we are already
    // iterating through an object, and it is up to the end user
    // whether to descend into the embedded object.
    if (f == null) {
      // FIXME: this is one of the key hard components of this
      // implementation. Will need to properly handle multiple
      // inheritance and possibly virtual base classes (i.e., not
      // iterating twice for a virtual base class inherited indirectly
      // more than once). For now, we do the simple thing, which
      // assumes single inheritance.
      for (int i = 0; i < getNumBaseClasses(); i++) {
        BasicCompoundType b = (BasicCompoundType) getBaseClass(i).getType();
        b.iterateObject(a, v, f);
      }
      // Now we are in our scope
      v.enterType(this, a);
      // Iterate through our fields
      for (int i = 0; i < getNumFields(); i++) {
        Field field = getField(i);
        BasicType fieldType = (BasicType) field.getType();
        fieldType.iterateObject(a.addOffsetTo(field.getOffset()), v, new BasicNamedFieldIdentifier(field));
      }
      v.exitType();
    } else {
      v.doCompound(f, a);
    }
  }

  protected Type createCVVariant(int cvAttributes) {
    BasicCompoundType t = new BasicCompoundType(getName(), getSize(), kind, cvAttributes);
    t.kind = kind;
    t.baseClasses = baseClasses;
    t.fields = fields;
    return t;
  }

  public void visit(TypeVisitor v) {
    v.doCompoundType(this);
  }
}