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1   /*
2    * Copyright (c) 2000, 2012, Oracle and/or its affiliates. All rights reserved.
3    * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4    *
5    * This code is free software; you can redistribute it and/or modify it
6    * under the terms of the GNU General Public License version 2 only, as
7    * published by the Free Software Foundation.
8    *
9    * This code is distributed in the hope that it will be useful, but WITHOUT
10   * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11   * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12   * version 2 for more details (a copy is included in the LICENSE file that
13   * accompanied this code).
14   *
15   * You should have received a copy of the GNU General Public License version
16   * 2 along with this work; if not, write to the Free Software Foundation,
17   * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18   *
19   * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20   * or visit www.oracle.com if you need additional information or have any
21   * questions.
22   *
23   */
24  
25  package sun.jvm.hotspot.oops;
26  
27  import java.io.*;
28  import java.util.*;
29  import sun.jvm.hotspot.debugger.*;
30  import sun.jvm.hotspot.runtime.*;
31  import sun.jvm.hotspot.types.*;
32  import sun.jvm.hotspot.utilities.*;
33  
34  // TypeArrayKlass is a proxy for TypeArrayKlass in the JVM
35  
36  public class TypeArrayKlass extends ArrayKlass {
37    static {
38      VM.registerVMInitializedObserver(new Observer() {
39          public void update(Observable o, Object data) {
40            initialize(VM.getVM().getTypeDataBase());
41          }
42        });
43    }
44  
45    private static synchronized void initialize(TypeDataBase db) throws WrongTypeException {
46      Type t             = db.lookupType("TypeArrayKlass");
47      maxLength          = new CIntField(t.getCIntegerField("_max_length"), 0);
48    }
49  
50    public TypeArrayKlass(Address addr) {
51      super(addr);
52    }
53  
54    private static CIntField  maxLength;
55  
56    public long getMaxLength()          { return  maxLength.getValue(this); }
57  
58    public static final int T_BOOLEAN = 4;
59    public static final int T_CHAR    = 5;
60    public static final int T_FLOAT   = 6;
61    public static final int T_DOUBLE  = 7;
62    public static final int T_BYTE    = 8;
63    public static final int T_SHORT   = 9;
64    public static final int T_INT     = 10;
65    public static final int T_LONG    = 11;
66  
67    public String getTypeName() {
68      switch ((int) getElementType()) {
69        case T_BOOLEAN: return "[Z";
70        case T_CHAR:    return "[C";
71        case T_FLOAT:   return "[F";
72        case T_DOUBLE:  return "[D";
73        case T_BYTE:    return "[B";
74        case T_SHORT:   return "[S";
75        case T_INT:     return "[I";
76        case T_LONG:    return "[J";
77      }
78      return "Unknown TypeArray";
79    }
80  
81    public String getElementTypeName() {
82      switch ((int) getElementType()) {
83        case T_BOOLEAN: return "boolean";
84        case T_CHAR:    return "char";
85        case T_FLOAT:   return "float";
86        case T_DOUBLE:  return "double";
87        case T_BYTE:    return "byte";
88        case T_SHORT:   return "short";
89        case T_INT:     return "int";
90        case T_LONG:    return "long";
91      }
92      throw new RuntimeException("should not reach here");
93    }
94  
95    public void printValueOn(PrintStream tty) {
96      tty.print("TypeArrayKlass for " + getTypeName());
97    }
98  
99    public void iterateFields(MetadataVisitor visitor) {
100     super.iterateFields(visitor);
101       visitor.doCInt(maxLength, true);
102     }
103 
104   public Klass arrayKlassImpl(boolean orNull, int n) {
105     int dimension = (int) getDimension();
106     if (Assert.ASSERTS_ENABLED) {
107       Assert.that(dimension <= n, "check order of chain");
108     }
109     if (dimension == n)
110       return this;
111     ObjArrayKlass ak = (ObjArrayKlass) getHigherDimension();
112     if (ak == null) {
113       if (orNull) return null;
114       // FIXME: would need to change in reflective system to actually
115       // allocate klass
116       throw new RuntimeException("Can not allocate array klasses in debugging system");
117     }
118     if (orNull) {
119       return ak.arrayKlassOrNull(n);
120     }
121     return ak.arrayKlass(n);
122   }
123 
124   public Klass arrayKlassImpl(boolean orNull) {
125     return arrayKlassImpl(orNull, (int) (getDimension() + 1));
126   }
127 }