--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/agent/src/share/classes/sun/jvm/hotspot/oops/FieldType.java	Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,107 @@
+/*
+ * Copyright 2000-2004 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ */
+
+package sun.jvm.hotspot.oops;
+
+import java.io.*;
+import sun.jvm.hotspot.runtime.BasicType;
+import sun.jvm.hotspot.utilities.*;
+
+public class FieldType {
+
+  private Symbol signature;
+  private char   first;
+
+  public FieldType(Symbol signature) {
+    this.signature = signature;
+    this.first     = (char) signature.getByteAt(0);
+    if (Assert.ASSERTS_ENABLED) {
+       switch (this.first) {
+       case 'B':
+       case 'C':
+       case 'D':
+       case 'F':
+       case 'I':
+       case 'J':
+       case 'S':
+       case 'Z':
+       case 'L':
+       case '[':
+           break;   // Ok. signature char known
+       default:
+         Assert.that(false, "Unknown char in field signature \"" + signature.asString() + "\": " + this.first);
+       }
+    }
+  }
+
+  public boolean isOop()     { return isObject() || isArray(); }
+  public boolean isByte()    { return first == 'B'; }
+  public boolean isChar()    { return first == 'C'; }
+  public boolean isDouble()  { return first == 'D'; }
+  public boolean isFloat()   { return first == 'F'; }
+  public boolean isInt()     { return first == 'I'; }
+  public boolean isLong()    { return first == 'J'; }
+  public boolean isShort()   { return first == 'S'; }
+  public boolean isBoolean() { return first == 'Z'; }
+  public boolean isObject()  { return first == 'L'; }
+  public boolean isArray()   { return first == '['; }
+
+  public static class ArrayInfo {
+    private int dimension;
+    private int elementBasicType; // See BasicType.java
+    // FIXME: consider adding name of element class
+
+    public ArrayInfo(int dimension, int elementBasicType) {
+      this.dimension = dimension;
+      this.elementBasicType = elementBasicType;
+    }
+
+    public int dimension()        { return dimension; }
+    /** See BasicType.java */
+    public int elementBasicType() { return elementBasicType; }
+  }
+
+  /** Only valid for T_ARRAY; throws unspecified exception otherwise */
+  public ArrayInfo getArrayInfo() {
+    int index = 1;
+    int dim   = 1;
+    index = skipOptionalSize(signature, index);
+    while (signature.getByteAt(index) == '[') {
+      index++;
+      dim++;
+      skipOptionalSize(signature, index);
+    }
+    int elementType = BasicType.charToType((char) signature.getByteAt(index));
+    return new ArrayInfo(dim, elementType);
+  }
+
+  private int skipOptionalSize(Symbol sig, int index) {
+    byte c = sig.getByteAt(index);
+    while (c >= '0' && c <= '9') {
+      ++index;
+      c = sig.getByteAt(index);
+    }
+    return index;
+  }
+}